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![Weijie Gao](/assets/img/avatar_default.png)
Some SPI controllers can't write nor->page_size bytes in a single step because their TX FIFO is too small, but when that happens we should make sure a WRITE_EN command before each write access and READ_SR command after each write access is issued. We should allow nor->write() to return a size that is smaller than the requested write size to gracefully handle this case. Also, the spi_nor_write_data() should return the actual number of bytes that were written during the spi_mem_exec_op() operation. This patch is a combination of two commits backported from kernel: commit 630d6bd8a3b4 ("mtd: spi-nor: Support controllers with limit ...") commit 3baa8ec88c2f ("mtd: devices: m25p80: Make sure WRITE_EN is ...") Cc: Vignesh R <vigneshr@ti.com> Signed-off-by: Weijie Gao <weijie.gao@mediatek.com> Acked-by: Vignesh R <vigneshr@ti.com> Tested-by: Shyam Saini <shyam.saini@amarulasolutions.com> # microzed Acked-by: Jagan Teki <jagan@amarulasolutions.com>
2402 lines
61 KiB
C
2402 lines
61 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Based on m25p80.c, by Mike Lavender (mike@steroidmicros.com), with
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* influence from lart.c (Abraham Van Der Merwe) and mtd_dataflash.c
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*
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* Copyright (C) 2005, Intec Automation Inc.
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* Copyright (C) 2014, Freescale Semiconductor, Inc.
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*
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* Synced from Linux v4.19
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*/
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#include <common.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/log2.h>
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#include <linux/math64.h>
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#include <linux/sizes.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/spi-nor.h>
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#include <spi-mem.h>
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#include <spi.h>
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#include "sf_internal.h"
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/* Define max times to check status register before we give up. */
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/*
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* For everything but full-chip erase; probably could be much smaller, but kept
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* around for safety for now
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*/
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#define HZ CONFIG_SYS_HZ
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#define DEFAULT_READY_WAIT_JIFFIES (40UL * HZ)
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static int spi_nor_read_write_reg(struct spi_nor *nor, struct spi_mem_op
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*op, void *buf)
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{
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if (op->data.dir == SPI_MEM_DATA_IN)
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op->data.buf.in = buf;
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else
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op->data.buf.out = buf;
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return spi_mem_exec_op(nor->spi, op);
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}
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static int spi_nor_read_reg(struct spi_nor *nor, u8 code, u8 *val, int len)
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{
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struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(code, 1),
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SPI_MEM_OP_NO_ADDR,
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SPI_MEM_OP_NO_DUMMY,
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SPI_MEM_OP_DATA_IN(len, NULL, 1));
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int ret;
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ret = spi_nor_read_write_reg(nor, &op, val);
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if (ret < 0)
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dev_dbg(&flash->spimem->spi->dev, "error %d reading %x\n", ret,
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code);
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return ret;
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}
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static int spi_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
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{
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struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(opcode, 1),
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SPI_MEM_OP_NO_ADDR,
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SPI_MEM_OP_NO_DUMMY,
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SPI_MEM_OP_DATA_OUT(len, NULL, 1));
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return spi_nor_read_write_reg(nor, &op, buf);
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}
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static ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len,
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u_char *buf)
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{
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struct spi_mem_op op =
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SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 1),
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SPI_MEM_OP_ADDR(nor->addr_width, from, 1),
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SPI_MEM_OP_DUMMY(nor->read_dummy, 1),
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SPI_MEM_OP_DATA_IN(len, buf, 1));
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size_t remaining = len;
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int ret;
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/* get transfer protocols. */
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op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->read_proto);
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op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto);
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op.dummy.buswidth = op.addr.buswidth;
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op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto);
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/* convert the dummy cycles to the number of bytes */
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op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
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while (remaining) {
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op.data.nbytes = remaining < UINT_MAX ? remaining : UINT_MAX;
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ret = spi_mem_adjust_op_size(nor->spi, &op);
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if (ret)
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return ret;
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ret = spi_mem_exec_op(nor->spi, &op);
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if (ret)
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return ret;
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op.addr.val += op.data.nbytes;
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remaining -= op.data.nbytes;
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op.data.buf.in += op.data.nbytes;
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}
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return len;
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}
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static ssize_t spi_nor_write_data(struct spi_nor *nor, loff_t to, size_t len,
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const u_char *buf)
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{
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struct spi_mem_op op =
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SPI_MEM_OP(SPI_MEM_OP_CMD(nor->program_opcode, 1),
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SPI_MEM_OP_ADDR(nor->addr_width, to, 1),
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SPI_MEM_OP_NO_DUMMY,
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SPI_MEM_OP_DATA_OUT(len, buf, 1));
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int ret;
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/* get transfer protocols. */
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op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->write_proto);
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op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->write_proto);
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op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto);
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if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)
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op.addr.nbytes = 0;
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ret = spi_mem_adjust_op_size(nor->spi, &op);
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if (ret)
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return ret;
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op.data.nbytes = len < op.data.nbytes ? len : op.data.nbytes;
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ret = spi_mem_exec_op(nor->spi, &op);
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if (ret)
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return ret;
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return op.data.nbytes;
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}
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/*
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* Read the status register, returning its value in the location
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* Return the status register value.
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* Returns negative if error occurred.
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*/
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static int read_sr(struct spi_nor *nor)
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{
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int ret;
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u8 val;
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ret = nor->read_reg(nor, SPINOR_OP_RDSR, &val, 1);
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if (ret < 0) {
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pr_debug("error %d reading SR\n", (int)ret);
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return ret;
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}
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return val;
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}
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/*
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* Read the flag status register, returning its value in the location
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* Return the status register value.
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* Returns negative if error occurred.
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*/
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static int read_fsr(struct spi_nor *nor)
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{
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int ret;
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u8 val;
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ret = nor->read_reg(nor, SPINOR_OP_RDFSR, &val, 1);
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if (ret < 0) {
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pr_debug("error %d reading FSR\n", ret);
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return ret;
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}
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return val;
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}
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/*
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* Read configuration register, returning its value in the
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* location. Return the configuration register value.
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* Returns negative if error occurred.
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*/
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#if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
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static int read_cr(struct spi_nor *nor)
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{
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int ret;
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u8 val;
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ret = nor->read_reg(nor, SPINOR_OP_RDCR, &val, 1);
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if (ret < 0) {
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dev_dbg(nor->dev, "error %d reading CR\n", ret);
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return ret;
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}
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return val;
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}
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#endif
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/*
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* Write status register 1 byte
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* Returns negative if error occurred.
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*/
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static int write_sr(struct spi_nor *nor, u8 val)
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{
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nor->cmd_buf[0] = val;
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return nor->write_reg(nor, SPINOR_OP_WRSR, nor->cmd_buf, 1);
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}
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/*
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* Set write enable latch with Write Enable command.
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* Returns negative if error occurred.
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*/
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static int write_enable(struct spi_nor *nor)
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{
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return nor->write_reg(nor, SPINOR_OP_WREN, NULL, 0);
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}
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/*
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* Send write disable instruction to the chip.
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*/
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static int write_disable(struct spi_nor *nor)
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{
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return nor->write_reg(nor, SPINOR_OP_WRDI, NULL, 0);
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}
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static struct spi_nor *mtd_to_spi_nor(struct mtd_info *mtd)
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{
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return mtd->priv;
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}
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#ifndef CONFIG_SPI_FLASH_BAR
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static u8 spi_nor_convert_opcode(u8 opcode, const u8 table[][2], size_t size)
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{
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size_t i;
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for (i = 0; i < size; i++)
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if (table[i][0] == opcode)
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return table[i][1];
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/* No conversion found, keep input op code. */
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return opcode;
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}
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static u8 spi_nor_convert_3to4_read(u8 opcode)
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{
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static const u8 spi_nor_3to4_read[][2] = {
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{ SPINOR_OP_READ, SPINOR_OP_READ_4B },
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{ SPINOR_OP_READ_FAST, SPINOR_OP_READ_FAST_4B },
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{ SPINOR_OP_READ_1_1_2, SPINOR_OP_READ_1_1_2_4B },
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{ SPINOR_OP_READ_1_2_2, SPINOR_OP_READ_1_2_2_4B },
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{ SPINOR_OP_READ_1_1_4, SPINOR_OP_READ_1_1_4_4B },
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{ SPINOR_OP_READ_1_4_4, SPINOR_OP_READ_1_4_4_4B },
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{ SPINOR_OP_READ_1_1_1_DTR, SPINOR_OP_READ_1_1_1_DTR_4B },
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{ SPINOR_OP_READ_1_2_2_DTR, SPINOR_OP_READ_1_2_2_DTR_4B },
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{ SPINOR_OP_READ_1_4_4_DTR, SPINOR_OP_READ_1_4_4_DTR_4B },
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};
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return spi_nor_convert_opcode(opcode, spi_nor_3to4_read,
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ARRAY_SIZE(spi_nor_3to4_read));
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}
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static u8 spi_nor_convert_3to4_program(u8 opcode)
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{
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static const u8 spi_nor_3to4_program[][2] = {
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{ SPINOR_OP_PP, SPINOR_OP_PP_4B },
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{ SPINOR_OP_PP_1_1_4, SPINOR_OP_PP_1_1_4_4B },
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{ SPINOR_OP_PP_1_4_4, SPINOR_OP_PP_1_4_4_4B },
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};
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return spi_nor_convert_opcode(opcode, spi_nor_3to4_program,
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ARRAY_SIZE(spi_nor_3to4_program));
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}
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static u8 spi_nor_convert_3to4_erase(u8 opcode)
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{
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static const u8 spi_nor_3to4_erase[][2] = {
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{ SPINOR_OP_BE_4K, SPINOR_OP_BE_4K_4B },
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{ SPINOR_OP_BE_32K, SPINOR_OP_BE_32K_4B },
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{ SPINOR_OP_SE, SPINOR_OP_SE_4B },
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};
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return spi_nor_convert_opcode(opcode, spi_nor_3to4_erase,
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ARRAY_SIZE(spi_nor_3to4_erase));
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}
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static void spi_nor_set_4byte_opcodes(struct spi_nor *nor,
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const struct flash_info *info)
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{
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/* Do some manufacturer fixups first */
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switch (JEDEC_MFR(info)) {
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case SNOR_MFR_SPANSION:
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/* No small sector erase for 4-byte command set */
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nor->erase_opcode = SPINOR_OP_SE;
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nor->mtd.erasesize = info->sector_size;
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break;
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default:
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break;
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}
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nor->read_opcode = spi_nor_convert_3to4_read(nor->read_opcode);
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nor->program_opcode = spi_nor_convert_3to4_program(nor->program_opcode);
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nor->erase_opcode = spi_nor_convert_3to4_erase(nor->erase_opcode);
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}
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#endif /* !CONFIG_SPI_FLASH_BAR */
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/* Enable/disable 4-byte addressing mode. */
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static int set_4byte(struct spi_nor *nor, const struct flash_info *info,
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int enable)
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{
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int status;
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bool need_wren = false;
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u8 cmd;
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switch (JEDEC_MFR(info)) {
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case SNOR_MFR_ST:
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case SNOR_MFR_MICRON:
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/* Some Micron need WREN command; all will accept it */
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need_wren = true;
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case SNOR_MFR_MACRONIX:
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case SNOR_MFR_WINBOND:
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if (need_wren)
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write_enable(nor);
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cmd = enable ? SPINOR_OP_EN4B : SPINOR_OP_EX4B;
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status = nor->write_reg(nor, cmd, NULL, 0);
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if (need_wren)
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write_disable(nor);
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if (!status && !enable &&
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JEDEC_MFR(info) == SNOR_MFR_WINBOND) {
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/*
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* On Winbond W25Q256FV, leaving 4byte mode causes
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* the Extended Address Register to be set to 1, so all
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* 3-byte-address reads come from the second 16M.
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* We must clear the register to enable normal behavior.
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*/
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write_enable(nor);
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nor->cmd_buf[0] = 0;
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nor->write_reg(nor, SPINOR_OP_WREAR, nor->cmd_buf, 1);
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write_disable(nor);
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}
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return status;
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default:
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/* Spansion style */
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nor->cmd_buf[0] = enable << 7;
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return nor->write_reg(nor, SPINOR_OP_BRWR, nor->cmd_buf, 1);
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}
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}
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static int spi_nor_sr_ready(struct spi_nor *nor)
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{
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int sr = read_sr(nor);
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if (sr < 0)
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return sr;
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if (nor->flags & SNOR_F_USE_CLSR && sr & (SR_E_ERR | SR_P_ERR)) {
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if (sr & SR_E_ERR)
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dev_dbg(nor->dev, "Erase Error occurred\n");
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else
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dev_dbg(nor->dev, "Programming Error occurred\n");
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nor->write_reg(nor, SPINOR_OP_CLSR, NULL, 0);
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return -EIO;
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}
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return !(sr & SR_WIP);
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}
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static int spi_nor_fsr_ready(struct spi_nor *nor)
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{
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int fsr = read_fsr(nor);
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if (fsr < 0)
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return fsr;
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if (fsr & (FSR_E_ERR | FSR_P_ERR)) {
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if (fsr & FSR_E_ERR)
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dev_dbg(nor->dev, "Erase operation failed.\n");
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else
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dev_dbg(nor->dev, "Program operation failed.\n");
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if (fsr & FSR_PT_ERR)
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dev_dbg(nor->dev,
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"Attempted to modify a protected sector.\n");
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nor->write_reg(nor, SPINOR_OP_CLFSR, NULL, 0);
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return -EIO;
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}
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return fsr & FSR_READY;
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}
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static int spi_nor_ready(struct spi_nor *nor)
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{
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int sr, fsr;
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sr = spi_nor_sr_ready(nor);
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if (sr < 0)
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return sr;
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fsr = nor->flags & SNOR_F_USE_FSR ? spi_nor_fsr_ready(nor) : 1;
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if (fsr < 0)
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return fsr;
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return sr && fsr;
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}
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/*
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* Service routine to read status register until ready, or timeout occurs.
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* Returns non-zero if error.
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*/
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static int spi_nor_wait_till_ready_with_timeout(struct spi_nor *nor,
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unsigned long timeout)
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{
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unsigned long timebase;
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int ret;
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timebase = get_timer(0);
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while (get_timer(timebase) < timeout) {
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ret = spi_nor_ready(nor);
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if (ret < 0)
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return ret;
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if (ret)
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return 0;
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}
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dev_err(nor->dev, "flash operation timed out\n");
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return -ETIMEDOUT;
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}
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static int spi_nor_wait_till_ready(struct spi_nor *nor)
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{
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return spi_nor_wait_till_ready_with_timeout(nor,
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DEFAULT_READY_WAIT_JIFFIES);
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}
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#ifdef CONFIG_SPI_FLASH_BAR
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/*
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* This "clean_bar" is necessary in a situation when one was accessing
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* spi flash memory > 16 MiB by using Bank Address Register's BA24 bit.
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*
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* After it the BA24 bit shall be cleared to allow access to correct
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* memory region after SW reset (by calling "reset" command).
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*
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* Otherwise, the BA24 bit may be left set and then after reset, the
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* ROM would read/write/erase SPL from 16 MiB * bank_sel address.
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*/
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static int clean_bar(struct spi_nor *nor)
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{
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u8 cmd, bank_sel = 0;
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if (nor->bank_curr == 0)
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return 0;
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cmd = nor->bank_write_cmd;
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nor->bank_curr = 0;
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write_enable(nor);
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return nor->write_reg(nor, cmd, &bank_sel, 1);
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}
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static int write_bar(struct spi_nor *nor, u32 offset)
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{
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u8 cmd, bank_sel;
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int ret;
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bank_sel = offset / SZ_16M;
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if (bank_sel == nor->bank_curr)
|
|
goto bar_end;
|
|
|
|
cmd = nor->bank_write_cmd;
|
|
write_enable(nor);
|
|
ret = nor->write_reg(nor, cmd, &bank_sel, 1);
|
|
if (ret < 0) {
|
|
debug("SF: fail to write bank register\n");
|
|
return ret;
|
|
}
|
|
|
|
bar_end:
|
|
nor->bank_curr = bank_sel;
|
|
return nor->bank_curr;
|
|
}
|
|
|
|
static int read_bar(struct spi_nor *nor, const struct flash_info *info)
|
|
{
|
|
u8 curr_bank = 0;
|
|
int ret;
|
|
|
|
switch (JEDEC_MFR(info)) {
|
|
case SNOR_MFR_SPANSION:
|
|
nor->bank_read_cmd = SPINOR_OP_BRRD;
|
|
nor->bank_write_cmd = SPINOR_OP_BRWR;
|
|
break;
|
|
default:
|
|
nor->bank_read_cmd = SPINOR_OP_RDEAR;
|
|
nor->bank_write_cmd = SPINOR_OP_WREAR;
|
|
}
|
|
|
|
ret = nor->read_reg(nor, nor->bank_read_cmd,
|
|
&curr_bank, 1);
|
|
if (ret) {
|
|
debug("SF: fail to read bank addr register\n");
|
|
return ret;
|
|
}
|
|
nor->bank_curr = curr_bank;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Initiate the erasure of a single sector
|
|
*/
|
|
static int spi_nor_erase_sector(struct spi_nor *nor, u32 addr)
|
|
{
|
|
struct spi_mem_op op =
|
|
SPI_MEM_OP(SPI_MEM_OP_CMD(nor->erase_opcode, 1),
|
|
SPI_MEM_OP_ADDR(nor->addr_width, addr, 1),
|
|
SPI_MEM_OP_NO_DUMMY,
|
|
SPI_MEM_OP_NO_DATA);
|
|
|
|
if (nor->erase)
|
|
return nor->erase(nor, addr);
|
|
|
|
/*
|
|
* Default implementation, if driver doesn't have a specialized HW
|
|
* control
|
|
*/
|
|
return spi_mem_exec_op(nor->spi, &op);
|
|
}
|
|
|
|
/*
|
|
* Erase an address range on the nor chip. The address range may extend
|
|
* one or more erase sectors. Return an error is there is a problem erasing.
|
|
*/
|
|
static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
|
|
{
|
|
struct spi_nor *nor = mtd_to_spi_nor(mtd);
|
|
u32 addr, len, rem;
|
|
int ret;
|
|
|
|
dev_dbg(nor->dev, "at 0x%llx, len %lld\n", (long long)instr->addr,
|
|
(long long)instr->len);
|
|
|
|
div_u64_rem(instr->len, mtd->erasesize, &rem);
|
|
if (rem)
|
|
return -EINVAL;
|
|
|
|
addr = instr->addr;
|
|
len = instr->len;
|
|
|
|
while (len) {
|
|
#ifdef CONFIG_SPI_FLASH_BAR
|
|
ret = write_bar(nor, addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
#endif
|
|
write_enable(nor);
|
|
|
|
ret = spi_nor_erase_sector(nor, addr);
|
|
if (ret)
|
|
goto erase_err;
|
|
|
|
addr += mtd->erasesize;
|
|
len -= mtd->erasesize;
|
|
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret)
|
|
goto erase_err;
|
|
}
|
|
|
|
erase_err:
|
|
#ifdef CONFIG_SPI_FLASH_BAR
|
|
ret = clean_bar(nor);
|
|
#endif
|
|
write_disable(nor);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined(CONFIG_SPI_FLASH_STMICRO) || defined(CONFIG_SPI_FLASH_SST)
|
|
/* Write status register and ensure bits in mask match written values */
|
|
static int write_sr_and_check(struct spi_nor *nor, u8 status_new, u8 mask)
|
|
{
|
|
int ret;
|
|
|
|
write_enable(nor);
|
|
ret = write_sr(nor, status_new);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = read_sr(nor);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return ((ret & mask) != (status_new & mask)) ? -EIO : 0;
|
|
}
|
|
|
|
static void stm_get_locked_range(struct spi_nor *nor, u8 sr, loff_t *ofs,
|
|
uint64_t *len)
|
|
{
|
|
struct mtd_info *mtd = &nor->mtd;
|
|
u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
|
|
int shift = ffs(mask) - 1;
|
|
int pow;
|
|
|
|
if (!(sr & mask)) {
|
|
/* No protection */
|
|
*ofs = 0;
|
|
*len = 0;
|
|
} else {
|
|
pow = ((sr & mask) ^ mask) >> shift;
|
|
*len = mtd->size >> pow;
|
|
if (nor->flags & SNOR_F_HAS_SR_TB && sr & SR_TB)
|
|
*ofs = 0;
|
|
else
|
|
*ofs = mtd->size - *len;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return 1 if the entire region is locked (if @locked is true) or unlocked (if
|
|
* @locked is false); 0 otherwise
|
|
*/
|
|
static int stm_check_lock_status_sr(struct spi_nor *nor, loff_t ofs, u64 len,
|
|
u8 sr, bool locked)
|
|
{
|
|
loff_t lock_offs;
|
|
uint64_t lock_len;
|
|
|
|
if (!len)
|
|
return 1;
|
|
|
|
stm_get_locked_range(nor, sr, &lock_offs, &lock_len);
|
|
|
|
if (locked)
|
|
/* Requested range is a sub-range of locked range */
|
|
return (ofs + len <= lock_offs + lock_len) && (ofs >= lock_offs);
|
|
else
|
|
/* Requested range does not overlap with locked range */
|
|
return (ofs >= lock_offs + lock_len) || (ofs + len <= lock_offs);
|
|
}
|
|
|
|
static int stm_is_locked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len,
|
|
u8 sr)
|
|
{
|
|
return stm_check_lock_status_sr(nor, ofs, len, sr, true);
|
|
}
|
|
|
|
static int stm_is_unlocked_sr(struct spi_nor *nor, loff_t ofs, uint64_t len,
|
|
u8 sr)
|
|
{
|
|
return stm_check_lock_status_sr(nor, ofs, len, sr, false);
|
|
}
|
|
|
|
/*
|
|
* Lock a region of the flash. Compatible with ST Micro and similar flash.
|
|
* Supports the block protection bits BP{0,1,2} in the status register
|
|
* (SR). Does not support these features found in newer SR bitfields:
|
|
* - SEC: sector/block protect - only handle SEC=0 (block protect)
|
|
* - CMP: complement protect - only support CMP=0 (range is not complemented)
|
|
*
|
|
* Support for the following is provided conditionally for some flash:
|
|
* - TB: top/bottom protect
|
|
*
|
|
* Sample table portion for 8MB flash (Winbond w25q64fw):
|
|
*
|
|
* SEC | TB | BP2 | BP1 | BP0 | Prot Length | Protected Portion
|
|
* --------------------------------------------------------------------------
|
|
* X | X | 0 | 0 | 0 | NONE | NONE
|
|
* 0 | 0 | 0 | 0 | 1 | 128 KB | Upper 1/64
|
|
* 0 | 0 | 0 | 1 | 0 | 256 KB | Upper 1/32
|
|
* 0 | 0 | 0 | 1 | 1 | 512 KB | Upper 1/16
|
|
* 0 | 0 | 1 | 0 | 0 | 1 MB | Upper 1/8
|
|
* 0 | 0 | 1 | 0 | 1 | 2 MB | Upper 1/4
|
|
* 0 | 0 | 1 | 1 | 0 | 4 MB | Upper 1/2
|
|
* X | X | 1 | 1 | 1 | 8 MB | ALL
|
|
* ------|-------|-------|-------|-------|---------------|-------------------
|
|
* 0 | 1 | 0 | 0 | 1 | 128 KB | Lower 1/64
|
|
* 0 | 1 | 0 | 1 | 0 | 256 KB | Lower 1/32
|
|
* 0 | 1 | 0 | 1 | 1 | 512 KB | Lower 1/16
|
|
* 0 | 1 | 1 | 0 | 0 | 1 MB | Lower 1/8
|
|
* 0 | 1 | 1 | 0 | 1 | 2 MB | Lower 1/4
|
|
* 0 | 1 | 1 | 1 | 0 | 4 MB | Lower 1/2
|
|
*
|
|
* Returns negative on errors, 0 on success.
|
|
*/
|
|
static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
|
|
{
|
|
struct mtd_info *mtd = &nor->mtd;
|
|
int status_old, status_new;
|
|
u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
|
|
u8 shift = ffs(mask) - 1, pow, val;
|
|
loff_t lock_len;
|
|
bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
|
|
bool use_top;
|
|
|
|
status_old = read_sr(nor);
|
|
if (status_old < 0)
|
|
return status_old;
|
|
|
|
/* If nothing in our range is unlocked, we don't need to do anything */
|
|
if (stm_is_locked_sr(nor, ofs, len, status_old))
|
|
return 0;
|
|
|
|
/* If anything below us is unlocked, we can't use 'bottom' protection */
|
|
if (!stm_is_locked_sr(nor, 0, ofs, status_old))
|
|
can_be_bottom = false;
|
|
|
|
/* If anything above us is unlocked, we can't use 'top' protection */
|
|
if (!stm_is_locked_sr(nor, ofs + len, mtd->size - (ofs + len),
|
|
status_old))
|
|
can_be_top = false;
|
|
|
|
if (!can_be_bottom && !can_be_top)
|
|
return -EINVAL;
|
|
|
|
/* Prefer top, if both are valid */
|
|
use_top = can_be_top;
|
|
|
|
/* lock_len: length of region that should end up locked */
|
|
if (use_top)
|
|
lock_len = mtd->size - ofs;
|
|
else
|
|
lock_len = ofs + len;
|
|
|
|
/*
|
|
* Need smallest pow such that:
|
|
*
|
|
* 1 / (2^pow) <= (len / size)
|
|
*
|
|
* so (assuming power-of-2 size) we do:
|
|
*
|
|
* pow = ceil(log2(size / len)) = log2(size) - floor(log2(len))
|
|
*/
|
|
pow = ilog2(mtd->size) - ilog2(lock_len);
|
|
val = mask - (pow << shift);
|
|
if (val & ~mask)
|
|
return -EINVAL;
|
|
/* Don't "lock" with no region! */
|
|
if (!(val & mask))
|
|
return -EINVAL;
|
|
|
|
status_new = (status_old & ~mask & ~SR_TB) | val;
|
|
|
|
/* Disallow further writes if WP pin is asserted */
|
|
status_new |= SR_SRWD;
|
|
|
|
if (!use_top)
|
|
status_new |= SR_TB;
|
|
|
|
/* Don't bother if they're the same */
|
|
if (status_new == status_old)
|
|
return 0;
|
|
|
|
/* Only modify protection if it will not unlock other areas */
|
|
if ((status_new & mask) < (status_old & mask))
|
|
return -EINVAL;
|
|
|
|
return write_sr_and_check(nor, status_new, mask);
|
|
}
|
|
|
|
/*
|
|
* Unlock a region of the flash. See stm_lock() for more info
|
|
*
|
|
* Returns negative on errors, 0 on success.
|
|
*/
|
|
static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
|
|
{
|
|
struct mtd_info *mtd = &nor->mtd;
|
|
int status_old, status_new;
|
|
u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
|
|
u8 shift = ffs(mask) - 1, pow, val;
|
|
loff_t lock_len;
|
|
bool can_be_top = true, can_be_bottom = nor->flags & SNOR_F_HAS_SR_TB;
|
|
bool use_top;
|
|
|
|
status_old = read_sr(nor);
|
|
if (status_old < 0)
|
|
return status_old;
|
|
|
|
/* If nothing in our range is locked, we don't need to do anything */
|
|
if (stm_is_unlocked_sr(nor, ofs, len, status_old))
|
|
return 0;
|
|
|
|
/* If anything below us is locked, we can't use 'top' protection */
|
|
if (!stm_is_unlocked_sr(nor, 0, ofs, status_old))
|
|
can_be_top = false;
|
|
|
|
/* If anything above us is locked, we can't use 'bottom' protection */
|
|
if (!stm_is_unlocked_sr(nor, ofs + len, mtd->size - (ofs + len),
|
|
status_old))
|
|
can_be_bottom = false;
|
|
|
|
if (!can_be_bottom && !can_be_top)
|
|
return -EINVAL;
|
|
|
|
/* Prefer top, if both are valid */
|
|
use_top = can_be_top;
|
|
|
|
/* lock_len: length of region that should remain locked */
|
|
if (use_top)
|
|
lock_len = mtd->size - (ofs + len);
|
|
else
|
|
lock_len = ofs;
|
|
|
|
/*
|
|
* Need largest pow such that:
|
|
*
|
|
* 1 / (2^pow) >= (len / size)
|
|
*
|
|
* so (assuming power-of-2 size) we do:
|
|
*
|
|
* pow = floor(log2(size / len)) = log2(size) - ceil(log2(len))
|
|
*/
|
|
pow = ilog2(mtd->size) - order_base_2(lock_len);
|
|
if (lock_len == 0) {
|
|
val = 0; /* fully unlocked */
|
|
} else {
|
|
val = mask - (pow << shift);
|
|
/* Some power-of-two sizes are not supported */
|
|
if (val & ~mask)
|
|
return -EINVAL;
|
|
}
|
|
|
|
status_new = (status_old & ~mask & ~SR_TB) | val;
|
|
|
|
/* Don't protect status register if we're fully unlocked */
|
|
if (lock_len == 0)
|
|
status_new &= ~SR_SRWD;
|
|
|
|
if (!use_top)
|
|
status_new |= SR_TB;
|
|
|
|
/* Don't bother if they're the same */
|
|
if (status_new == status_old)
|
|
return 0;
|
|
|
|
/* Only modify protection if it will not lock other areas */
|
|
if ((status_new & mask) > (status_old & mask))
|
|
return -EINVAL;
|
|
|
|
return write_sr_and_check(nor, status_new, mask);
|
|
}
|
|
|
|
/*
|
|
* Check if a region of the flash is (completely) locked. See stm_lock() for
|
|
* more info.
|
|
*
|
|
* Returns 1 if entire region is locked, 0 if any portion is unlocked, and
|
|
* negative on errors.
|
|
*/
|
|
static int stm_is_locked(struct spi_nor *nor, loff_t ofs, uint64_t len)
|
|
{
|
|
int status;
|
|
|
|
status = read_sr(nor);
|
|
if (status < 0)
|
|
return status;
|
|
|
|
return stm_is_locked_sr(nor, ofs, len, status);
|
|
}
|
|
#endif /* CONFIG_SPI_FLASH_STMICRO */
|
|
|
|
static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
|
|
{
|
|
int tmp;
|
|
u8 id[SPI_NOR_MAX_ID_LEN];
|
|
const struct flash_info *info;
|
|
|
|
tmp = nor->read_reg(nor, SPINOR_OP_RDID, id, SPI_NOR_MAX_ID_LEN);
|
|
if (tmp < 0) {
|
|
dev_dbg(nor->dev, "error %d reading JEDEC ID\n", tmp);
|
|
return ERR_PTR(tmp);
|
|
}
|
|
|
|
info = spi_nor_ids;
|
|
for (; info->name; info++) {
|
|
if (info->id_len) {
|
|
if (!memcmp(info->id, id, info->id_len))
|
|
return info;
|
|
}
|
|
}
|
|
|
|
dev_err(nor->dev, "unrecognized JEDEC id bytes: %02x, %02x, %02x\n",
|
|
id[0], id[1], id[2]);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
|
|
size_t *retlen, u_char *buf)
|
|
{
|
|
struct spi_nor *nor = mtd_to_spi_nor(mtd);
|
|
int ret;
|
|
|
|
dev_dbg(nor->dev, "from 0x%08x, len %zd\n", (u32)from, len);
|
|
|
|
while (len) {
|
|
loff_t addr = from;
|
|
size_t read_len = len;
|
|
|
|
#ifdef CONFIG_SPI_FLASH_BAR
|
|
u32 remain_len;
|
|
|
|
ret = write_bar(nor, addr);
|
|
if (ret < 0)
|
|
return log_ret(ret);
|
|
remain_len = (SZ_16M * (nor->bank_curr + 1)) - addr;
|
|
|
|
if (len < remain_len)
|
|
read_len = len;
|
|
else
|
|
read_len = remain_len;
|
|
#endif
|
|
|
|
ret = nor->read(nor, addr, read_len, buf);
|
|
if (ret == 0) {
|
|
/* We shouldn't see 0-length reads */
|
|
ret = -EIO;
|
|
goto read_err;
|
|
}
|
|
if (ret < 0)
|
|
goto read_err;
|
|
|
|
*retlen += ret;
|
|
buf += ret;
|
|
from += ret;
|
|
len -= ret;
|
|
}
|
|
ret = 0;
|
|
|
|
read_err:
|
|
#ifdef CONFIG_SPI_FLASH_BAR
|
|
ret = clean_bar(nor);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_SPI_FLASH_SST
|
|
static int sst_write_byteprogram(struct spi_nor *nor, loff_t to, size_t len,
|
|
size_t *retlen, const u_char *buf)
|
|
{
|
|
size_t actual;
|
|
int ret = 0;
|
|
|
|
for (actual = 0; actual < len; actual++) {
|
|
nor->program_opcode = SPINOR_OP_BP;
|
|
|
|
write_enable(nor);
|
|
/* write one byte. */
|
|
ret = nor->write(nor, to, 1, buf + actual);
|
|
if (ret < 0)
|
|
goto sst_write_err;
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret)
|
|
goto sst_write_err;
|
|
to++;
|
|
}
|
|
|
|
sst_write_err:
|
|
write_disable(nor);
|
|
return ret;
|
|
}
|
|
|
|
static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
|
|
size_t *retlen, const u_char *buf)
|
|
{
|
|
struct spi_nor *nor = mtd_to_spi_nor(mtd);
|
|
struct spi_slave *spi = nor->spi;
|
|
size_t actual;
|
|
int ret;
|
|
|
|
dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len);
|
|
if (spi->mode & SPI_TX_BYTE)
|
|
return sst_write_byteprogram(nor, to, len, retlen, buf);
|
|
|
|
write_enable(nor);
|
|
|
|
nor->sst_write_second = false;
|
|
|
|
actual = to % 2;
|
|
/* Start write from odd address. */
|
|
if (actual) {
|
|
nor->program_opcode = SPINOR_OP_BP;
|
|
|
|
/* write one byte. */
|
|
ret = nor->write(nor, to, 1, buf);
|
|
if (ret < 0)
|
|
goto sst_write_err;
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret)
|
|
goto sst_write_err;
|
|
}
|
|
to += actual;
|
|
|
|
/* Write out most of the data here. */
|
|
for (; actual < len - 1; actual += 2) {
|
|
nor->program_opcode = SPINOR_OP_AAI_WP;
|
|
|
|
/* write two bytes. */
|
|
ret = nor->write(nor, to, 2, buf + actual);
|
|
if (ret < 0)
|
|
goto sst_write_err;
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret)
|
|
goto sst_write_err;
|
|
to += 2;
|
|
nor->sst_write_second = true;
|
|
}
|
|
nor->sst_write_second = false;
|
|
|
|
write_disable(nor);
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret)
|
|
goto sst_write_err;
|
|
|
|
/* Write out trailing byte if it exists. */
|
|
if (actual != len) {
|
|
write_enable(nor);
|
|
|
|
nor->program_opcode = SPINOR_OP_BP;
|
|
ret = nor->write(nor, to, 1, buf + actual);
|
|
if (ret < 0)
|
|
goto sst_write_err;
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret)
|
|
goto sst_write_err;
|
|
write_disable(nor);
|
|
actual += 1;
|
|
}
|
|
sst_write_err:
|
|
*retlen += actual;
|
|
return ret;
|
|
}
|
|
#endif
|
|
/*
|
|
* Write an address range to the nor chip. Data must be written in
|
|
* FLASH_PAGESIZE chunks. The address range may be any size provided
|
|
* it is within the physical boundaries.
|
|
*/
|
|
static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,
|
|
size_t *retlen, const u_char *buf)
|
|
{
|
|
struct spi_nor *nor = mtd_to_spi_nor(mtd);
|
|
size_t page_offset, page_remain, i;
|
|
ssize_t ret;
|
|
|
|
dev_dbg(nor->dev, "to 0x%08x, len %zd\n", (u32)to, len);
|
|
|
|
for (i = 0; i < len; ) {
|
|
ssize_t written;
|
|
loff_t addr = to + i;
|
|
|
|
/*
|
|
* If page_size is a power of two, the offset can be quickly
|
|
* calculated with an AND operation. On the other cases we
|
|
* need to do a modulus operation (more expensive).
|
|
* Power of two numbers have only one bit set and we can use
|
|
* the instruction hweight32 to detect if we need to do a
|
|
* modulus (do_div()) or not.
|
|
*/
|
|
if (hweight32(nor->page_size) == 1) {
|
|
page_offset = addr & (nor->page_size - 1);
|
|
} else {
|
|
u64 aux = addr;
|
|
|
|
page_offset = do_div(aux, nor->page_size);
|
|
}
|
|
/* the size of data remaining on the first page */
|
|
page_remain = min_t(size_t,
|
|
nor->page_size - page_offset, len - i);
|
|
|
|
#ifdef CONFIG_SPI_FLASH_BAR
|
|
ret = write_bar(nor, addr);
|
|
if (ret < 0)
|
|
return ret;
|
|
#endif
|
|
write_enable(nor);
|
|
ret = nor->write(nor, addr, page_remain, buf + i);
|
|
if (ret < 0)
|
|
goto write_err;
|
|
written = ret;
|
|
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret)
|
|
goto write_err;
|
|
*retlen += written;
|
|
i += written;
|
|
}
|
|
|
|
write_err:
|
|
#ifdef CONFIG_SPI_FLASH_BAR
|
|
ret = clean_bar(nor);
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_SPI_FLASH_MACRONIX
|
|
/**
|
|
* macronix_quad_enable() - set QE bit in Status Register.
|
|
* @nor: pointer to a 'struct spi_nor'
|
|
*
|
|
* Set the Quad Enable (QE) bit in the Status Register.
|
|
*
|
|
* bit 6 of the Status Register is the QE bit for Macronix like QSPI memories.
|
|
*
|
|
* Return: 0 on success, -errno otherwise.
|
|
*/
|
|
static int macronix_quad_enable(struct spi_nor *nor)
|
|
{
|
|
int ret, val;
|
|
|
|
val = read_sr(nor);
|
|
if (val < 0)
|
|
return val;
|
|
if (val & SR_QUAD_EN_MX)
|
|
return 0;
|
|
|
|
write_enable(nor);
|
|
|
|
write_sr(nor, val | SR_QUAD_EN_MX);
|
|
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = read_sr(nor);
|
|
if (!(ret > 0 && (ret & SR_QUAD_EN_MX))) {
|
|
dev_err(nor->dev, "Macronix Quad bit not set\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
|
|
/*
|
|
* Write status Register and configuration register with 2 bytes
|
|
* The first byte will be written to the status register, while the
|
|
* second byte will be written to the configuration register.
|
|
* Return negative if error occurred.
|
|
*/
|
|
static int write_sr_cr(struct spi_nor *nor, u8 *sr_cr)
|
|
{
|
|
int ret;
|
|
|
|
write_enable(nor);
|
|
|
|
ret = nor->write_reg(nor, SPINOR_OP_WRSR, sr_cr, 2);
|
|
if (ret < 0) {
|
|
dev_dbg(nor->dev,
|
|
"error while writing configuration register\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = spi_nor_wait_till_ready(nor);
|
|
if (ret) {
|
|
dev_dbg(nor->dev,
|
|
"timeout while writing configuration register\n");
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* spansion_read_cr_quad_enable() - set QE bit in Configuration Register.
|
|
* @nor: pointer to a 'struct spi_nor'
|
|
*
|
|
* Set the Quad Enable (QE) bit in the Configuration Register.
|
|
* This function should be used with QSPI memories supporting the Read
|
|
* Configuration Register (35h) instruction.
|
|
*
|
|
* bit 1 of the Configuration Register is the QE bit for Spansion like QSPI
|
|
* memories.
|
|
*
|
|
* Return: 0 on success, -errno otherwise.
|
|
*/
|
|
static int spansion_read_cr_quad_enable(struct spi_nor *nor)
|
|
{
|
|
u8 sr_cr[2];
|
|
int ret;
|
|
|
|
/* Check current Quad Enable bit value. */
|
|
ret = read_cr(nor);
|
|
if (ret < 0) {
|
|
dev_dbg(dev, "error while reading configuration register\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ret & CR_QUAD_EN_SPAN)
|
|
return 0;
|
|
|
|
sr_cr[1] = ret | CR_QUAD_EN_SPAN;
|
|
|
|
/* Keep the current value of the Status Register. */
|
|
ret = read_sr(nor);
|
|
if (ret < 0) {
|
|
dev_dbg(dev, "error while reading status register\n");
|
|
return -EINVAL;
|
|
}
|
|
sr_cr[0] = ret;
|
|
|
|
ret = write_sr_cr(nor, sr_cr);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Read back and check it. */
|
|
ret = read_cr(nor);
|
|
if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) {
|
|
dev_dbg(nor->dev, "Spansion Quad bit not set\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_IS_ENABLED(SPI_FLASH_SFDP_SUPPORT)
|
|
/**
|
|
* spansion_no_read_cr_quad_enable() - set QE bit in Configuration Register.
|
|
* @nor: pointer to a 'struct spi_nor'
|
|
*
|
|
* Set the Quad Enable (QE) bit in the Configuration Register.
|
|
* This function should be used with QSPI memories not supporting the Read
|
|
* Configuration Register (35h) instruction.
|
|
*
|
|
* bit 1 of the Configuration Register is the QE bit for Spansion like QSPI
|
|
* memories.
|
|
*
|
|
* Return: 0 on success, -errno otherwise.
|
|
*/
|
|
static int spansion_no_read_cr_quad_enable(struct spi_nor *nor)
|
|
{
|
|
u8 sr_cr[2];
|
|
int ret;
|
|
|
|
/* Keep the current value of the Status Register. */
|
|
ret = read_sr(nor);
|
|
if (ret < 0) {
|
|
dev_dbg(nor->dev, "error while reading status register\n");
|
|
return -EINVAL;
|
|
}
|
|
sr_cr[0] = ret;
|
|
sr_cr[1] = CR_QUAD_EN_SPAN;
|
|
|
|
return write_sr_cr(nor, sr_cr);
|
|
}
|
|
|
|
#endif /* CONFIG_SPI_FLASH_SFDP_SUPPORT */
|
|
#endif /* CONFIG_SPI_FLASH_SPANSION */
|
|
|
|
struct spi_nor_read_command {
|
|
u8 num_mode_clocks;
|
|
u8 num_wait_states;
|
|
u8 opcode;
|
|
enum spi_nor_protocol proto;
|
|
};
|
|
|
|
struct spi_nor_pp_command {
|
|
u8 opcode;
|
|
enum spi_nor_protocol proto;
|
|
};
|
|
|
|
enum spi_nor_read_command_index {
|
|
SNOR_CMD_READ,
|
|
SNOR_CMD_READ_FAST,
|
|
SNOR_CMD_READ_1_1_1_DTR,
|
|
|
|
/* Dual SPI */
|
|
SNOR_CMD_READ_1_1_2,
|
|
SNOR_CMD_READ_1_2_2,
|
|
SNOR_CMD_READ_2_2_2,
|
|
SNOR_CMD_READ_1_2_2_DTR,
|
|
|
|
/* Quad SPI */
|
|
SNOR_CMD_READ_1_1_4,
|
|
SNOR_CMD_READ_1_4_4,
|
|
SNOR_CMD_READ_4_4_4,
|
|
SNOR_CMD_READ_1_4_4_DTR,
|
|
|
|
/* Octo SPI */
|
|
SNOR_CMD_READ_1_1_8,
|
|
SNOR_CMD_READ_1_8_8,
|
|
SNOR_CMD_READ_8_8_8,
|
|
SNOR_CMD_READ_1_8_8_DTR,
|
|
|
|
SNOR_CMD_READ_MAX
|
|
};
|
|
|
|
enum spi_nor_pp_command_index {
|
|
SNOR_CMD_PP,
|
|
|
|
/* Quad SPI */
|
|
SNOR_CMD_PP_1_1_4,
|
|
SNOR_CMD_PP_1_4_4,
|
|
SNOR_CMD_PP_4_4_4,
|
|
|
|
/* Octo SPI */
|
|
SNOR_CMD_PP_1_1_8,
|
|
SNOR_CMD_PP_1_8_8,
|
|
SNOR_CMD_PP_8_8_8,
|
|
|
|
SNOR_CMD_PP_MAX
|
|
};
|
|
|
|
struct spi_nor_flash_parameter {
|
|
u64 size;
|
|
u32 page_size;
|
|
|
|
struct spi_nor_hwcaps hwcaps;
|
|
struct spi_nor_read_command reads[SNOR_CMD_READ_MAX];
|
|
struct spi_nor_pp_command page_programs[SNOR_CMD_PP_MAX];
|
|
|
|
int (*quad_enable)(struct spi_nor *nor);
|
|
};
|
|
|
|
static void
|
|
spi_nor_set_read_settings(struct spi_nor_read_command *read,
|
|
u8 num_mode_clocks,
|
|
u8 num_wait_states,
|
|
u8 opcode,
|
|
enum spi_nor_protocol proto)
|
|
{
|
|
read->num_mode_clocks = num_mode_clocks;
|
|
read->num_wait_states = num_wait_states;
|
|
read->opcode = opcode;
|
|
read->proto = proto;
|
|
}
|
|
|
|
static void
|
|
spi_nor_set_pp_settings(struct spi_nor_pp_command *pp,
|
|
u8 opcode,
|
|
enum spi_nor_protocol proto)
|
|
{
|
|
pp->opcode = opcode;
|
|
pp->proto = proto;
|
|
}
|
|
|
|
#if CONFIG_IS_ENABLED(SPI_FLASH_SFDP_SUPPORT)
|
|
/*
|
|
* Serial Flash Discoverable Parameters (SFDP) parsing.
|
|
*/
|
|
|
|
/**
|
|
* spi_nor_read_sfdp() - read Serial Flash Discoverable Parameters.
|
|
* @nor: pointer to a 'struct spi_nor'
|
|
* @addr: offset in the SFDP area to start reading data from
|
|
* @len: number of bytes to read
|
|
* @buf: buffer where the SFDP data are copied into (dma-safe memory)
|
|
*
|
|
* Whatever the actual numbers of bytes for address and dummy cycles are
|
|
* for (Fast) Read commands, the Read SFDP (5Ah) instruction is always
|
|
* followed by a 3-byte address and 8 dummy clock cycles.
|
|
*
|
|
* Return: 0 on success, -errno otherwise.
|
|
*/
|
|
static int spi_nor_read_sfdp(struct spi_nor *nor, u32 addr,
|
|
size_t len, void *buf)
|
|
{
|
|
u8 addr_width, read_opcode, read_dummy;
|
|
int ret;
|
|
|
|
read_opcode = nor->read_opcode;
|
|
addr_width = nor->addr_width;
|
|
read_dummy = nor->read_dummy;
|
|
|
|
nor->read_opcode = SPINOR_OP_RDSFDP;
|
|
nor->addr_width = 3;
|
|
nor->read_dummy = 8;
|
|
|
|
while (len) {
|
|
ret = nor->read(nor, addr, len, (u8 *)buf);
|
|
if (!ret || ret > len) {
|
|
ret = -EIO;
|
|
goto read_err;
|
|
}
|
|
if (ret < 0)
|
|
goto read_err;
|
|
|
|
buf += ret;
|
|
addr += ret;
|
|
len -= ret;
|
|
}
|
|
ret = 0;
|
|
|
|
read_err:
|
|
nor->read_opcode = read_opcode;
|
|
nor->addr_width = addr_width;
|
|
nor->read_dummy = read_dummy;
|
|
|
|
return ret;
|
|
}
|
|
|
|
struct sfdp_parameter_header {
|
|
u8 id_lsb;
|
|
u8 minor;
|
|
u8 major;
|
|
u8 length; /* in double words */
|
|
u8 parameter_table_pointer[3]; /* byte address */
|
|
u8 id_msb;
|
|
};
|
|
|
|
#define SFDP_PARAM_HEADER_ID(p) (((p)->id_msb << 8) | (p)->id_lsb)
|
|
#define SFDP_PARAM_HEADER_PTP(p) \
|
|
(((p)->parameter_table_pointer[2] << 16) | \
|
|
((p)->parameter_table_pointer[1] << 8) | \
|
|
((p)->parameter_table_pointer[0] << 0))
|
|
|
|
#define SFDP_BFPT_ID 0xff00 /* Basic Flash Parameter Table */
|
|
#define SFDP_SECTOR_MAP_ID 0xff81 /* Sector Map Table */
|
|
|
|
#define SFDP_SIGNATURE 0x50444653U
|
|
#define SFDP_JESD216_MAJOR 1
|
|
#define SFDP_JESD216_MINOR 0
|
|
#define SFDP_JESD216A_MINOR 5
|
|
#define SFDP_JESD216B_MINOR 6
|
|
|
|
struct sfdp_header {
|
|
u32 signature; /* Ox50444653U <=> "SFDP" */
|
|
u8 minor;
|
|
u8 major;
|
|
u8 nph; /* 0-base number of parameter headers */
|
|
u8 unused;
|
|
|
|
/* Basic Flash Parameter Table. */
|
|
struct sfdp_parameter_header bfpt_header;
|
|
};
|
|
|
|
/* Basic Flash Parameter Table */
|
|
|
|
/*
|
|
* JESD216 rev B defines a Basic Flash Parameter Table of 16 DWORDs.
|
|
* They are indexed from 1 but C arrays are indexed from 0.
|
|
*/
|
|
#define BFPT_DWORD(i) ((i) - 1)
|
|
#define BFPT_DWORD_MAX 16
|
|
|
|
/* The first version of JESB216 defined only 9 DWORDs. */
|
|
#define BFPT_DWORD_MAX_JESD216 9
|
|
|
|
/* 1st DWORD. */
|
|
#define BFPT_DWORD1_FAST_READ_1_1_2 BIT(16)
|
|
#define BFPT_DWORD1_ADDRESS_BYTES_MASK GENMASK(18, 17)
|
|
#define BFPT_DWORD1_ADDRESS_BYTES_3_ONLY (0x0UL << 17)
|
|
#define BFPT_DWORD1_ADDRESS_BYTES_3_OR_4 (0x1UL << 17)
|
|
#define BFPT_DWORD1_ADDRESS_BYTES_4_ONLY (0x2UL << 17)
|
|
#define BFPT_DWORD1_DTR BIT(19)
|
|
#define BFPT_DWORD1_FAST_READ_1_2_2 BIT(20)
|
|
#define BFPT_DWORD1_FAST_READ_1_4_4 BIT(21)
|
|
#define BFPT_DWORD1_FAST_READ_1_1_4 BIT(22)
|
|
|
|
/* 5th DWORD. */
|
|
#define BFPT_DWORD5_FAST_READ_2_2_2 BIT(0)
|
|
#define BFPT_DWORD5_FAST_READ_4_4_4 BIT(4)
|
|
|
|
/* 11th DWORD. */
|
|
#define BFPT_DWORD11_PAGE_SIZE_SHIFT 4
|
|
#define BFPT_DWORD11_PAGE_SIZE_MASK GENMASK(7, 4)
|
|
|
|
/* 15th DWORD. */
|
|
|
|
/*
|
|
* (from JESD216 rev B)
|
|
* Quad Enable Requirements (QER):
|
|
* - 000b: Device does not have a QE bit. Device detects 1-1-4 and 1-4-4
|
|
* reads based on instruction. DQ3/HOLD# functions are hold during
|
|
* instruction phase.
|
|
* - 001b: QE is bit 1 of status register 2. It is set via Write Status with
|
|
* two data bytes where bit 1 of the second byte is one.
|
|
* [...]
|
|
* Writing only one byte to the status register has the side-effect of
|
|
* clearing status register 2, including the QE bit. The 100b code is
|
|
* used if writing one byte to the status register does not modify
|
|
* status register 2.
|
|
* - 010b: QE is bit 6 of status register 1. It is set via Write Status with
|
|
* one data byte where bit 6 is one.
|
|
* [...]
|
|
* - 011b: QE is bit 7 of status register 2. It is set via Write status
|
|
* register 2 instruction 3Eh with one data byte where bit 7 is one.
|
|
* [...]
|
|
* The status register 2 is read using instruction 3Fh.
|
|
* - 100b: QE is bit 1 of status register 2. It is set via Write Status with
|
|
* two data bytes where bit 1 of the second byte is one.
|
|
* [...]
|
|
* In contrast to the 001b code, writing one byte to the status
|
|
* register does not modify status register 2.
|
|
* - 101b: QE is bit 1 of status register 2. Status register 1 is read using
|
|
* Read Status instruction 05h. Status register2 is read using
|
|
* instruction 35h. QE is set via Writ Status instruction 01h with
|
|
* two data bytes where bit 1 of the second byte is one.
|
|
* [...]
|
|
*/
|
|
#define BFPT_DWORD15_QER_MASK GENMASK(22, 20)
|
|
#define BFPT_DWORD15_QER_NONE (0x0UL << 20) /* Micron */
|
|
#define BFPT_DWORD15_QER_SR2_BIT1_BUGGY (0x1UL << 20)
|
|
#define BFPT_DWORD15_QER_SR1_BIT6 (0x2UL << 20) /* Macronix */
|
|
#define BFPT_DWORD15_QER_SR2_BIT7 (0x3UL << 20)
|
|
#define BFPT_DWORD15_QER_SR2_BIT1_NO_RD (0x4UL << 20)
|
|
#define BFPT_DWORD15_QER_SR2_BIT1 (0x5UL << 20) /* Spansion */
|
|
|
|
struct sfdp_bfpt {
|
|
u32 dwords[BFPT_DWORD_MAX];
|
|
};
|
|
|
|
/* Fast Read settings. */
|
|
|
|
static void
|
|
spi_nor_set_read_settings_from_bfpt(struct spi_nor_read_command *read,
|
|
u16 half,
|
|
enum spi_nor_protocol proto)
|
|
{
|
|
read->num_mode_clocks = (half >> 5) & 0x07;
|
|
read->num_wait_states = (half >> 0) & 0x1f;
|
|
read->opcode = (half >> 8) & 0xff;
|
|
read->proto = proto;
|
|
}
|
|
|
|
struct sfdp_bfpt_read {
|
|
/* The Fast Read x-y-z hardware capability in params->hwcaps.mask. */
|
|
u32 hwcaps;
|
|
|
|
/*
|
|
* The <supported_bit> bit in <supported_dword> BFPT DWORD tells us
|
|
* whether the Fast Read x-y-z command is supported.
|
|
*/
|
|
u32 supported_dword;
|
|
u32 supported_bit;
|
|
|
|
/*
|
|
* The half-word at offset <setting_shift> in <setting_dword> BFPT DWORD
|
|
* encodes the op code, the number of mode clocks and the number of wait
|
|
* states to be used by Fast Read x-y-z command.
|
|
*/
|
|
u32 settings_dword;
|
|
u32 settings_shift;
|
|
|
|
/* The SPI protocol for this Fast Read x-y-z command. */
|
|
enum spi_nor_protocol proto;
|
|
};
|
|
|
|
static const struct sfdp_bfpt_read sfdp_bfpt_reads[] = {
|
|
/* Fast Read 1-1-2 */
|
|
{
|
|
SNOR_HWCAPS_READ_1_1_2,
|
|
BFPT_DWORD(1), BIT(16), /* Supported bit */
|
|
BFPT_DWORD(4), 0, /* Settings */
|
|
SNOR_PROTO_1_1_2,
|
|
},
|
|
|
|
/* Fast Read 1-2-2 */
|
|
{
|
|
SNOR_HWCAPS_READ_1_2_2,
|
|
BFPT_DWORD(1), BIT(20), /* Supported bit */
|
|
BFPT_DWORD(4), 16, /* Settings */
|
|
SNOR_PROTO_1_2_2,
|
|
},
|
|
|
|
/* Fast Read 2-2-2 */
|
|
{
|
|
SNOR_HWCAPS_READ_2_2_2,
|
|
BFPT_DWORD(5), BIT(0), /* Supported bit */
|
|
BFPT_DWORD(6), 16, /* Settings */
|
|
SNOR_PROTO_2_2_2,
|
|
},
|
|
|
|
/* Fast Read 1-1-4 */
|
|
{
|
|
SNOR_HWCAPS_READ_1_1_4,
|
|
BFPT_DWORD(1), BIT(22), /* Supported bit */
|
|
BFPT_DWORD(3), 16, /* Settings */
|
|
SNOR_PROTO_1_1_4,
|
|
},
|
|
|
|
/* Fast Read 1-4-4 */
|
|
{
|
|
SNOR_HWCAPS_READ_1_4_4,
|
|
BFPT_DWORD(1), BIT(21), /* Supported bit */
|
|
BFPT_DWORD(3), 0, /* Settings */
|
|
SNOR_PROTO_1_4_4,
|
|
},
|
|
|
|
/* Fast Read 4-4-4 */
|
|
{
|
|
SNOR_HWCAPS_READ_4_4_4,
|
|
BFPT_DWORD(5), BIT(4), /* Supported bit */
|
|
BFPT_DWORD(7), 16, /* Settings */
|
|
SNOR_PROTO_4_4_4,
|
|
},
|
|
};
|
|
|
|
struct sfdp_bfpt_erase {
|
|
/*
|
|
* The half-word at offset <shift> in DWORD <dwoard> encodes the
|
|
* op code and erase sector size to be used by Sector Erase commands.
|
|
*/
|
|
u32 dword;
|
|
u32 shift;
|
|
};
|
|
|
|
static const struct sfdp_bfpt_erase sfdp_bfpt_erases[] = {
|
|
/* Erase Type 1 in DWORD8 bits[15:0] */
|
|
{BFPT_DWORD(8), 0},
|
|
|
|
/* Erase Type 2 in DWORD8 bits[31:16] */
|
|
{BFPT_DWORD(8), 16},
|
|
|
|
/* Erase Type 3 in DWORD9 bits[15:0] */
|
|
{BFPT_DWORD(9), 0},
|
|
|
|
/* Erase Type 4 in DWORD9 bits[31:16] */
|
|
{BFPT_DWORD(9), 16},
|
|
};
|
|
|
|
static int spi_nor_hwcaps_read2cmd(u32 hwcaps);
|
|
|
|
/**
|
|
* spi_nor_parse_bfpt() - read and parse the Basic Flash Parameter Table.
|
|
* @nor: pointer to a 'struct spi_nor'
|
|
* @bfpt_header: pointer to the 'struct sfdp_parameter_header' describing
|
|
* the Basic Flash Parameter Table length and version
|
|
* @params: pointer to the 'struct spi_nor_flash_parameter' to be
|
|
* filled
|
|
*
|
|
* The Basic Flash Parameter Table is the main and only mandatory table as
|
|
* defined by the SFDP (JESD216) specification.
|
|
* It provides us with the total size (memory density) of the data array and
|
|
* the number of address bytes for Fast Read, Page Program and Sector Erase
|
|
* commands.
|
|
* For Fast READ commands, it also gives the number of mode clock cycles and
|
|
* wait states (regrouped in the number of dummy clock cycles) for each
|
|
* supported instruction op code.
|
|
* For Page Program, the page size is now available since JESD216 rev A, however
|
|
* the supported instruction op codes are still not provided.
|
|
* For Sector Erase commands, this table stores the supported instruction op
|
|
* codes and the associated sector sizes.
|
|
* Finally, the Quad Enable Requirements (QER) are also available since JESD216
|
|
* rev A. The QER bits encode the manufacturer dependent procedure to be
|
|
* executed to set the Quad Enable (QE) bit in some internal register of the
|
|
* Quad SPI memory. Indeed the QE bit, when it exists, must be set before
|
|
* sending any Quad SPI command to the memory. Actually, setting the QE bit
|
|
* tells the memory to reassign its WP# and HOLD#/RESET# pins to functions IO2
|
|
* and IO3 hence enabling 4 (Quad) I/O lines.
|
|
*
|
|
* Return: 0 on success, -errno otherwise.
|
|
*/
|
|
static int spi_nor_parse_bfpt(struct spi_nor *nor,
|
|
const struct sfdp_parameter_header *bfpt_header,
|
|
struct spi_nor_flash_parameter *params)
|
|
{
|
|
struct mtd_info *mtd = &nor->mtd;
|
|
struct sfdp_bfpt bfpt;
|
|
size_t len;
|
|
int i, cmd, err;
|
|
u32 addr;
|
|
u16 half;
|
|
|
|
/* JESD216 Basic Flash Parameter Table length is at least 9 DWORDs. */
|
|
if (bfpt_header->length < BFPT_DWORD_MAX_JESD216)
|
|
return -EINVAL;
|
|
|
|
/* Read the Basic Flash Parameter Table. */
|
|
len = min_t(size_t, sizeof(bfpt),
|
|
bfpt_header->length * sizeof(u32));
|
|
addr = SFDP_PARAM_HEADER_PTP(bfpt_header);
|
|
memset(&bfpt, 0, sizeof(bfpt));
|
|
err = spi_nor_read_sfdp(nor, addr, len, &bfpt);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* Fix endianness of the BFPT DWORDs. */
|
|
for (i = 0; i < BFPT_DWORD_MAX; i++)
|
|
bfpt.dwords[i] = le32_to_cpu(bfpt.dwords[i]);
|
|
|
|
/* Number of address bytes. */
|
|
switch (bfpt.dwords[BFPT_DWORD(1)] & BFPT_DWORD1_ADDRESS_BYTES_MASK) {
|
|
case BFPT_DWORD1_ADDRESS_BYTES_3_ONLY:
|
|
nor->addr_width = 3;
|
|
break;
|
|
|
|
case BFPT_DWORD1_ADDRESS_BYTES_4_ONLY:
|
|
nor->addr_width = 4;
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Flash Memory Density (in bits). */
|
|
params->size = bfpt.dwords[BFPT_DWORD(2)];
|
|
if (params->size & BIT(31)) {
|
|
params->size &= ~BIT(31);
|
|
|
|
/*
|
|
* Prevent overflows on params->size. Anyway, a NOR of 2^64
|
|
* bits is unlikely to exist so this error probably means
|
|
* the BFPT we are reading is corrupted/wrong.
|
|
*/
|
|
if (params->size > 63)
|
|
return -EINVAL;
|
|
|
|
params->size = 1ULL << params->size;
|
|
} else {
|
|
params->size++;
|
|
}
|
|
params->size >>= 3; /* Convert to bytes. */
|
|
|
|
/* Fast Read settings. */
|
|
for (i = 0; i < ARRAY_SIZE(sfdp_bfpt_reads); i++) {
|
|
const struct sfdp_bfpt_read *rd = &sfdp_bfpt_reads[i];
|
|
struct spi_nor_read_command *read;
|
|
|
|
if (!(bfpt.dwords[rd->supported_dword] & rd->supported_bit)) {
|
|
params->hwcaps.mask &= ~rd->hwcaps;
|
|
continue;
|
|
}
|
|
|
|
params->hwcaps.mask |= rd->hwcaps;
|
|
cmd = spi_nor_hwcaps_read2cmd(rd->hwcaps);
|
|
read = ¶ms->reads[cmd];
|
|
half = bfpt.dwords[rd->settings_dword] >> rd->settings_shift;
|
|
spi_nor_set_read_settings_from_bfpt(read, half, rd->proto);
|
|
}
|
|
|
|
/* Sector Erase settings. */
|
|
for (i = 0; i < ARRAY_SIZE(sfdp_bfpt_erases); i++) {
|
|
const struct sfdp_bfpt_erase *er = &sfdp_bfpt_erases[i];
|
|
u32 erasesize;
|
|
u8 opcode;
|
|
|
|
half = bfpt.dwords[er->dword] >> er->shift;
|
|
erasesize = half & 0xff;
|
|
|
|
/* erasesize == 0 means this Erase Type is not supported. */
|
|
if (!erasesize)
|
|
continue;
|
|
|
|
erasesize = 1U << erasesize;
|
|
opcode = (half >> 8) & 0xff;
|
|
#ifdef CONFIG_MTD_SPI_NOR_USE_4K_SECTORS
|
|
if (erasesize == SZ_4K) {
|
|
nor->erase_opcode = opcode;
|
|
mtd->erasesize = erasesize;
|
|
break;
|
|
}
|
|
#endif
|
|
if (!mtd->erasesize || mtd->erasesize < erasesize) {
|
|
nor->erase_opcode = opcode;
|
|
mtd->erasesize = erasesize;
|
|
}
|
|
}
|
|
|
|
/* Stop here if not JESD216 rev A or later. */
|
|
if (bfpt_header->length < BFPT_DWORD_MAX)
|
|
return 0;
|
|
|
|
/* Page size: this field specifies 'N' so the page size = 2^N bytes. */
|
|
params->page_size = bfpt.dwords[BFPT_DWORD(11)];
|
|
params->page_size &= BFPT_DWORD11_PAGE_SIZE_MASK;
|
|
params->page_size >>= BFPT_DWORD11_PAGE_SIZE_SHIFT;
|
|
params->page_size = 1U << params->page_size;
|
|
|
|
/* Quad Enable Requirements. */
|
|
switch (bfpt.dwords[BFPT_DWORD(15)] & BFPT_DWORD15_QER_MASK) {
|
|
case BFPT_DWORD15_QER_NONE:
|
|
params->quad_enable = NULL;
|
|
break;
|
|
#if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
|
|
case BFPT_DWORD15_QER_SR2_BIT1_BUGGY:
|
|
case BFPT_DWORD15_QER_SR2_BIT1_NO_RD:
|
|
params->quad_enable = spansion_no_read_cr_quad_enable;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_SPI_FLASH_MACRONIX
|
|
case BFPT_DWORD15_QER_SR1_BIT6:
|
|
params->quad_enable = macronix_quad_enable;
|
|
break;
|
|
#endif
|
|
#if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
|
|
case BFPT_DWORD15_QER_SR2_BIT1:
|
|
params->quad_enable = spansion_read_cr_quad_enable;
|
|
break;
|
|
#endif
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* spi_nor_parse_sfdp() - parse the Serial Flash Discoverable Parameters.
|
|
* @nor: pointer to a 'struct spi_nor'
|
|
* @params: pointer to the 'struct spi_nor_flash_parameter' to be
|
|
* filled
|
|
*
|
|
* The Serial Flash Discoverable Parameters are described by the JEDEC JESD216
|
|
* specification. This is a standard which tends to supported by almost all
|
|
* (Q)SPI memory manufacturers. Those hard-coded tables allow us to learn at
|
|
* runtime the main parameters needed to perform basic SPI flash operations such
|
|
* as Fast Read, Page Program or Sector Erase commands.
|
|
*
|
|
* Return: 0 on success, -errno otherwise.
|
|
*/
|
|
static int spi_nor_parse_sfdp(struct spi_nor *nor,
|
|
struct spi_nor_flash_parameter *params)
|
|
{
|
|
const struct sfdp_parameter_header *param_header, *bfpt_header;
|
|
struct sfdp_parameter_header *param_headers = NULL;
|
|
struct sfdp_header header;
|
|
size_t psize;
|
|
int i, err;
|
|
|
|
/* Get the SFDP header. */
|
|
err = spi_nor_read_sfdp(nor, 0, sizeof(header), &header);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
/* Check the SFDP header version. */
|
|
if (le32_to_cpu(header.signature) != SFDP_SIGNATURE ||
|
|
header.major != SFDP_JESD216_MAJOR)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Verify that the first and only mandatory parameter header is a
|
|
* Basic Flash Parameter Table header as specified in JESD216.
|
|
*/
|
|
bfpt_header = &header.bfpt_header;
|
|
if (SFDP_PARAM_HEADER_ID(bfpt_header) != SFDP_BFPT_ID ||
|
|
bfpt_header->major != SFDP_JESD216_MAJOR)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Allocate memory then read all parameter headers with a single
|
|
* Read SFDP command. These parameter headers will actually be parsed
|
|
* twice: a first time to get the latest revision of the basic flash
|
|
* parameter table, then a second time to handle the supported optional
|
|
* tables.
|
|
* Hence we read the parameter headers once for all to reduce the
|
|
* processing time. Also we use kmalloc() instead of devm_kmalloc()
|
|
* because we don't need to keep these parameter headers: the allocated
|
|
* memory is always released with kfree() before exiting this function.
|
|
*/
|
|
if (header.nph) {
|
|
psize = header.nph * sizeof(*param_headers);
|
|
|
|
param_headers = kmalloc(psize, GFP_KERNEL);
|
|
if (!param_headers)
|
|
return -ENOMEM;
|
|
|
|
err = spi_nor_read_sfdp(nor, sizeof(header),
|
|
psize, param_headers);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to read SFDP parameter headers\n");
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Check other parameter headers to get the latest revision of
|
|
* the basic flash parameter table.
|
|
*/
|
|
for (i = 0; i < header.nph; i++) {
|
|
param_header = ¶m_headers[i];
|
|
|
|
if (SFDP_PARAM_HEADER_ID(param_header) == SFDP_BFPT_ID &&
|
|
param_header->major == SFDP_JESD216_MAJOR &&
|
|
(param_header->minor > bfpt_header->minor ||
|
|
(param_header->minor == bfpt_header->minor &&
|
|
param_header->length > bfpt_header->length)))
|
|
bfpt_header = param_header;
|
|
}
|
|
|
|
err = spi_nor_parse_bfpt(nor, bfpt_header, params);
|
|
if (err)
|
|
goto exit;
|
|
|
|
/* Parse other parameter headers. */
|
|
for (i = 0; i < header.nph; i++) {
|
|
param_header = ¶m_headers[i];
|
|
|
|
switch (SFDP_PARAM_HEADER_ID(param_header)) {
|
|
case SFDP_SECTOR_MAP_ID:
|
|
dev_info(dev, "non-uniform erase sector maps are not supported yet.\n");
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (err)
|
|
goto exit;
|
|
}
|
|
|
|
exit:
|
|
kfree(param_headers);
|
|
return err;
|
|
}
|
|
#else
|
|
static int spi_nor_parse_sfdp(struct spi_nor *nor,
|
|
struct spi_nor_flash_parameter *params)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
#endif /* SPI_FLASH_SFDP_SUPPORT */
|
|
|
|
static int spi_nor_init_params(struct spi_nor *nor,
|
|
const struct flash_info *info,
|
|
struct spi_nor_flash_parameter *params)
|
|
{
|
|
/* Set legacy flash parameters as default. */
|
|
memset(params, 0, sizeof(*params));
|
|
|
|
/* Set SPI NOR sizes. */
|
|
params->size = info->sector_size * info->n_sectors;
|
|
params->page_size = info->page_size;
|
|
|
|
/* (Fast) Read settings. */
|
|
params->hwcaps.mask |= SNOR_HWCAPS_READ;
|
|
spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ],
|
|
0, 0, SPINOR_OP_READ,
|
|
SNOR_PROTO_1_1_1);
|
|
|
|
if (!(info->flags & SPI_NOR_NO_FR)) {
|
|
params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
|
|
spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_FAST],
|
|
0, 8, SPINOR_OP_READ_FAST,
|
|
SNOR_PROTO_1_1_1);
|
|
}
|
|
|
|
if (info->flags & SPI_NOR_DUAL_READ) {
|
|
params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2;
|
|
spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_1_1_2],
|
|
0, 8, SPINOR_OP_READ_1_1_2,
|
|
SNOR_PROTO_1_1_2);
|
|
}
|
|
|
|
if (info->flags & SPI_NOR_QUAD_READ) {
|
|
params->hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4;
|
|
spi_nor_set_read_settings(¶ms->reads[SNOR_CMD_READ_1_1_4],
|
|
0, 8, SPINOR_OP_READ_1_1_4,
|
|
SNOR_PROTO_1_1_4);
|
|
}
|
|
|
|
/* Page Program settings. */
|
|
params->hwcaps.mask |= SNOR_HWCAPS_PP;
|
|
spi_nor_set_pp_settings(¶ms->page_programs[SNOR_CMD_PP],
|
|
SPINOR_OP_PP, SNOR_PROTO_1_1_1);
|
|
|
|
if (info->flags & SPI_NOR_QUAD_READ) {
|
|
params->hwcaps.mask |= SNOR_HWCAPS_PP_1_1_4;
|
|
spi_nor_set_pp_settings(¶ms->page_programs[SNOR_CMD_PP_1_1_4],
|
|
SPINOR_OP_PP_1_1_4, SNOR_PROTO_1_1_4);
|
|
}
|
|
|
|
/* Select the procedure to set the Quad Enable bit. */
|
|
if (params->hwcaps.mask & (SNOR_HWCAPS_READ_QUAD |
|
|
SNOR_HWCAPS_PP_QUAD)) {
|
|
switch (JEDEC_MFR(info)) {
|
|
#ifdef CONFIG_SPI_FLASH_MACRONIX
|
|
case SNOR_MFR_MACRONIX:
|
|
params->quad_enable = macronix_quad_enable;
|
|
break;
|
|
#endif
|
|
case SNOR_MFR_ST:
|
|
case SNOR_MFR_MICRON:
|
|
break;
|
|
|
|
default:
|
|
#if defined(CONFIG_SPI_FLASH_SPANSION) || defined(CONFIG_SPI_FLASH_WINBOND)
|
|
/* Kept only for backward compatibility purpose. */
|
|
params->quad_enable = spansion_read_cr_quad_enable;
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Override the parameters with data read from SFDP tables. */
|
|
nor->addr_width = 0;
|
|
nor->mtd.erasesize = 0;
|
|
if ((info->flags & (SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ)) &&
|
|
!(info->flags & SPI_NOR_SKIP_SFDP)) {
|
|
struct spi_nor_flash_parameter sfdp_params;
|
|
|
|
memcpy(&sfdp_params, params, sizeof(sfdp_params));
|
|
if (spi_nor_parse_sfdp(nor, &sfdp_params)) {
|
|
nor->addr_width = 0;
|
|
nor->mtd.erasesize = 0;
|
|
} else {
|
|
memcpy(params, &sfdp_params, sizeof(*params));
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int spi_nor_hwcaps2cmd(u32 hwcaps, const int table[][2], size_t size)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < size; i++)
|
|
if (table[i][0] == (int)hwcaps)
|
|
return table[i][1];
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int spi_nor_hwcaps_read2cmd(u32 hwcaps)
|
|
{
|
|
static const int hwcaps_read2cmd[][2] = {
|
|
{ SNOR_HWCAPS_READ, SNOR_CMD_READ },
|
|
{ SNOR_HWCAPS_READ_FAST, SNOR_CMD_READ_FAST },
|
|
{ SNOR_HWCAPS_READ_1_1_1_DTR, SNOR_CMD_READ_1_1_1_DTR },
|
|
{ SNOR_HWCAPS_READ_1_1_2, SNOR_CMD_READ_1_1_2 },
|
|
{ SNOR_HWCAPS_READ_1_2_2, SNOR_CMD_READ_1_2_2 },
|
|
{ SNOR_HWCAPS_READ_2_2_2, SNOR_CMD_READ_2_2_2 },
|
|
{ SNOR_HWCAPS_READ_1_2_2_DTR, SNOR_CMD_READ_1_2_2_DTR },
|
|
{ SNOR_HWCAPS_READ_1_1_4, SNOR_CMD_READ_1_1_4 },
|
|
{ SNOR_HWCAPS_READ_1_4_4, SNOR_CMD_READ_1_4_4 },
|
|
{ SNOR_HWCAPS_READ_4_4_4, SNOR_CMD_READ_4_4_4 },
|
|
{ SNOR_HWCAPS_READ_1_4_4_DTR, SNOR_CMD_READ_1_4_4_DTR },
|
|
{ SNOR_HWCAPS_READ_1_1_8, SNOR_CMD_READ_1_1_8 },
|
|
{ SNOR_HWCAPS_READ_1_8_8, SNOR_CMD_READ_1_8_8 },
|
|
{ SNOR_HWCAPS_READ_8_8_8, SNOR_CMD_READ_8_8_8 },
|
|
{ SNOR_HWCAPS_READ_1_8_8_DTR, SNOR_CMD_READ_1_8_8_DTR },
|
|
};
|
|
|
|
return spi_nor_hwcaps2cmd(hwcaps, hwcaps_read2cmd,
|
|
ARRAY_SIZE(hwcaps_read2cmd));
|
|
}
|
|
|
|
static int spi_nor_hwcaps_pp2cmd(u32 hwcaps)
|
|
{
|
|
static const int hwcaps_pp2cmd[][2] = {
|
|
{ SNOR_HWCAPS_PP, SNOR_CMD_PP },
|
|
{ SNOR_HWCAPS_PP_1_1_4, SNOR_CMD_PP_1_1_4 },
|
|
{ SNOR_HWCAPS_PP_1_4_4, SNOR_CMD_PP_1_4_4 },
|
|
{ SNOR_HWCAPS_PP_4_4_4, SNOR_CMD_PP_4_4_4 },
|
|
{ SNOR_HWCAPS_PP_1_1_8, SNOR_CMD_PP_1_1_8 },
|
|
{ SNOR_HWCAPS_PP_1_8_8, SNOR_CMD_PP_1_8_8 },
|
|
{ SNOR_HWCAPS_PP_8_8_8, SNOR_CMD_PP_8_8_8 },
|
|
};
|
|
|
|
return spi_nor_hwcaps2cmd(hwcaps, hwcaps_pp2cmd,
|
|
ARRAY_SIZE(hwcaps_pp2cmd));
|
|
}
|
|
|
|
static int spi_nor_select_read(struct spi_nor *nor,
|
|
const struct spi_nor_flash_parameter *params,
|
|
u32 shared_hwcaps)
|
|
{
|
|
int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_READ_MASK) - 1;
|
|
const struct spi_nor_read_command *read;
|
|
|
|
if (best_match < 0)
|
|
return -EINVAL;
|
|
|
|
cmd = spi_nor_hwcaps_read2cmd(BIT(best_match));
|
|
if (cmd < 0)
|
|
return -EINVAL;
|
|
|
|
read = ¶ms->reads[cmd];
|
|
nor->read_opcode = read->opcode;
|
|
nor->read_proto = read->proto;
|
|
|
|
/*
|
|
* In the spi-nor framework, we don't need to make the difference
|
|
* between mode clock cycles and wait state clock cycles.
|
|
* Indeed, the value of the mode clock cycles is used by a QSPI
|
|
* flash memory to know whether it should enter or leave its 0-4-4
|
|
* (Continuous Read / XIP) mode.
|
|
* eXecution In Place is out of the scope of the mtd sub-system.
|
|
* Hence we choose to merge both mode and wait state clock cycles
|
|
* into the so called dummy clock cycles.
|
|
*/
|
|
nor->read_dummy = read->num_mode_clocks + read->num_wait_states;
|
|
return 0;
|
|
}
|
|
|
|
static int spi_nor_select_pp(struct spi_nor *nor,
|
|
const struct spi_nor_flash_parameter *params,
|
|
u32 shared_hwcaps)
|
|
{
|
|
int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_PP_MASK) - 1;
|
|
const struct spi_nor_pp_command *pp;
|
|
|
|
if (best_match < 0)
|
|
return -EINVAL;
|
|
|
|
cmd = spi_nor_hwcaps_pp2cmd(BIT(best_match));
|
|
if (cmd < 0)
|
|
return -EINVAL;
|
|
|
|
pp = ¶ms->page_programs[cmd];
|
|
nor->program_opcode = pp->opcode;
|
|
nor->write_proto = pp->proto;
|
|
return 0;
|
|
}
|
|
|
|
static int spi_nor_select_erase(struct spi_nor *nor,
|
|
const struct flash_info *info)
|
|
{
|
|
struct mtd_info *mtd = &nor->mtd;
|
|
|
|
/* Do nothing if already configured from SFDP. */
|
|
if (mtd->erasesize)
|
|
return 0;
|
|
|
|
#ifdef CONFIG_SPI_FLASH_USE_4K_SECTORS
|
|
/* prefer "small sector" erase if possible */
|
|
if (info->flags & SECT_4K) {
|
|
nor->erase_opcode = SPINOR_OP_BE_4K;
|
|
mtd->erasesize = 4096;
|
|
} else if (info->flags & SECT_4K_PMC) {
|
|
nor->erase_opcode = SPINOR_OP_BE_4K_PMC;
|
|
mtd->erasesize = 4096;
|
|
} else
|
|
#endif
|
|
{
|
|
nor->erase_opcode = SPINOR_OP_SE;
|
|
mtd->erasesize = info->sector_size;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int spi_nor_setup(struct spi_nor *nor, const struct flash_info *info,
|
|
const struct spi_nor_flash_parameter *params,
|
|
const struct spi_nor_hwcaps *hwcaps)
|
|
{
|
|
u32 ignored_mask, shared_mask;
|
|
bool enable_quad_io;
|
|
int err;
|
|
|
|
/*
|
|
* Keep only the hardware capabilities supported by both the SPI
|
|
* controller and the SPI flash memory.
|
|
*/
|
|
shared_mask = hwcaps->mask & params->hwcaps.mask;
|
|
|
|
/* SPI n-n-n protocols are not supported yet. */
|
|
ignored_mask = (SNOR_HWCAPS_READ_2_2_2 |
|
|
SNOR_HWCAPS_READ_4_4_4 |
|
|
SNOR_HWCAPS_READ_8_8_8 |
|
|
SNOR_HWCAPS_PP_4_4_4 |
|
|
SNOR_HWCAPS_PP_8_8_8);
|
|
if (shared_mask & ignored_mask) {
|
|
dev_dbg(nor->dev,
|
|
"SPI n-n-n protocols are not supported yet.\n");
|
|
shared_mask &= ~ignored_mask;
|
|
}
|
|
|
|
/* Select the (Fast) Read command. */
|
|
err = spi_nor_select_read(nor, params, shared_mask);
|
|
if (err) {
|
|
dev_dbg(nor->dev,
|
|
"can't select read settings supported by both the SPI controller and memory.\n");
|
|
return err;
|
|
}
|
|
|
|
/* Select the Page Program command. */
|
|
err = spi_nor_select_pp(nor, params, shared_mask);
|
|
if (err) {
|
|
dev_dbg(nor->dev,
|
|
"can't select write settings supported by both the SPI controller and memory.\n");
|
|
return err;
|
|
}
|
|
|
|
/* Select the Sector Erase command. */
|
|
err = spi_nor_select_erase(nor, info);
|
|
if (err) {
|
|
dev_dbg(nor->dev,
|
|
"can't select erase settings supported by both the SPI controller and memory.\n");
|
|
return err;
|
|
}
|
|
|
|
/* Enable Quad I/O if needed. */
|
|
enable_quad_io = (spi_nor_get_protocol_width(nor->read_proto) == 4 ||
|
|
spi_nor_get_protocol_width(nor->write_proto) == 4);
|
|
if (enable_quad_io && params->quad_enable)
|
|
nor->quad_enable = params->quad_enable;
|
|
else
|
|
nor->quad_enable = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int spi_nor_init(struct spi_nor *nor)
|
|
{
|
|
int err;
|
|
|
|
/*
|
|
* Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up
|
|
* with the software protection bits set
|
|
*/
|
|
if (JEDEC_MFR(nor->info) == SNOR_MFR_ATMEL ||
|
|
JEDEC_MFR(nor->info) == SNOR_MFR_INTEL ||
|
|
JEDEC_MFR(nor->info) == SNOR_MFR_SST ||
|
|
nor->info->flags & SPI_NOR_HAS_LOCK) {
|
|
write_enable(nor);
|
|
write_sr(nor, 0);
|
|
spi_nor_wait_till_ready(nor);
|
|
}
|
|
|
|
if (nor->quad_enable) {
|
|
err = nor->quad_enable(nor);
|
|
if (err) {
|
|
dev_dbg(nor->dev, "quad mode not supported\n");
|
|
return err;
|
|
}
|
|
}
|
|
|
|
if (nor->addr_width == 4 &&
|
|
(JEDEC_MFR(nor->info) != SNOR_MFR_SPANSION) &&
|
|
!(nor->info->flags & SPI_NOR_4B_OPCODES)) {
|
|
/*
|
|
* If the RESET# pin isn't hooked up properly, or the system
|
|
* otherwise doesn't perform a reset command in the boot
|
|
* sequence, it's impossible to 100% protect against unexpected
|
|
* reboots (e.g., crashes). Warn the user (or hopefully, system
|
|
* designer) that this is bad.
|
|
*/
|
|
if (nor->flags & SNOR_F_BROKEN_RESET)
|
|
printf("enabling reset hack; may not recover from unexpected reboots\n");
|
|
set_4byte(nor, nor->info, 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int spi_nor_scan(struct spi_nor *nor)
|
|
{
|
|
struct spi_nor_flash_parameter params;
|
|
const struct flash_info *info = NULL;
|
|
struct mtd_info *mtd = &nor->mtd;
|
|
struct spi_nor_hwcaps hwcaps = {
|
|
.mask = SNOR_HWCAPS_READ |
|
|
SNOR_HWCAPS_READ_FAST |
|
|
SNOR_HWCAPS_PP,
|
|
};
|
|
struct spi_slave *spi = nor->spi;
|
|
int ret;
|
|
|
|
/* Reset SPI protocol for all commands. */
|
|
nor->reg_proto = SNOR_PROTO_1_1_1;
|
|
nor->read_proto = SNOR_PROTO_1_1_1;
|
|
nor->write_proto = SNOR_PROTO_1_1_1;
|
|
nor->read = spi_nor_read_data;
|
|
nor->write = spi_nor_write_data;
|
|
nor->read_reg = spi_nor_read_reg;
|
|
nor->write_reg = spi_nor_write_reg;
|
|
|
|
if (spi->mode & SPI_RX_QUAD) {
|
|
hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4;
|
|
|
|
if (spi->mode & SPI_TX_QUAD)
|
|
hwcaps.mask |= (SNOR_HWCAPS_READ_1_4_4 |
|
|
SNOR_HWCAPS_PP_1_1_4 |
|
|
SNOR_HWCAPS_PP_1_4_4);
|
|
} else if (spi->mode & SPI_RX_DUAL) {
|
|
hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2;
|
|
|
|
if (spi->mode & SPI_TX_DUAL)
|
|
hwcaps.mask |= SNOR_HWCAPS_READ_1_2_2;
|
|
}
|
|
|
|
info = spi_nor_read_id(nor);
|
|
if (IS_ERR_OR_NULL(info))
|
|
return -ENOENT;
|
|
/* Parse the Serial Flash Discoverable Parameters table. */
|
|
ret = spi_nor_init_params(nor, info, ¶ms);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!mtd->name)
|
|
mtd->name = info->name;
|
|
mtd->priv = nor;
|
|
mtd->type = MTD_NORFLASH;
|
|
mtd->writesize = 1;
|
|
mtd->flags = MTD_CAP_NORFLASH;
|
|
mtd->size = params.size;
|
|
mtd->_erase = spi_nor_erase;
|
|
mtd->_read = spi_nor_read;
|
|
|
|
#if defined(CONFIG_SPI_FLASH_STMICRO) || defined(CONFIG_SPI_FLASH_SST)
|
|
/* NOR protection support for STmicro/Micron chips and similar */
|
|
if (JEDEC_MFR(info) == SNOR_MFR_ST ||
|
|
JEDEC_MFR(info) == SNOR_MFR_MICRON ||
|
|
JEDEC_MFR(info) == SNOR_MFR_SST ||
|
|
info->flags & SPI_NOR_HAS_LOCK) {
|
|
nor->flash_lock = stm_lock;
|
|
nor->flash_unlock = stm_unlock;
|
|
nor->flash_is_locked = stm_is_locked;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_SPI_FLASH_SST
|
|
/* sst nor chips use AAI word program */
|
|
if (info->flags & SST_WRITE)
|
|
mtd->_write = sst_write;
|
|
else
|
|
#endif
|
|
mtd->_write = spi_nor_write;
|
|
|
|
if (info->flags & USE_FSR)
|
|
nor->flags |= SNOR_F_USE_FSR;
|
|
if (info->flags & SPI_NOR_HAS_TB)
|
|
nor->flags |= SNOR_F_HAS_SR_TB;
|
|
if (info->flags & NO_CHIP_ERASE)
|
|
nor->flags |= SNOR_F_NO_OP_CHIP_ERASE;
|
|
if (info->flags & USE_CLSR)
|
|
nor->flags |= SNOR_F_USE_CLSR;
|
|
|
|
if (info->flags & SPI_NOR_NO_ERASE)
|
|
mtd->flags |= MTD_NO_ERASE;
|
|
|
|
nor->page_size = params.page_size;
|
|
mtd->writebufsize = nor->page_size;
|
|
|
|
/* Some devices cannot do fast-read, no matter what DT tells us */
|
|
if ((info->flags & SPI_NOR_NO_FR) || (spi->mode & SPI_RX_SLOW))
|
|
params.hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
|
|
|
|
/*
|
|
* Configure the SPI memory:
|
|
* - select op codes for (Fast) Read, Page Program and Sector Erase.
|
|
* - set the number of dummy cycles (mode cycles + wait states).
|
|
* - set the SPI protocols for register and memory accesses.
|
|
* - set the Quad Enable bit if needed (required by SPI x-y-4 protos).
|
|
*/
|
|
ret = spi_nor_setup(nor, info, ¶ms, &hwcaps);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (nor->addr_width) {
|
|
/* already configured from SFDP */
|
|
} else if (info->addr_width) {
|
|
nor->addr_width = info->addr_width;
|
|
} else if (mtd->size > SZ_16M) {
|
|
#ifndef CONFIG_SPI_FLASH_BAR
|
|
/* enable 4-byte addressing if the device exceeds 16MiB */
|
|
nor->addr_width = 4;
|
|
if (JEDEC_MFR(info) == SNOR_MFR_SPANSION ||
|
|
info->flags & SPI_NOR_4B_OPCODES)
|
|
spi_nor_set_4byte_opcodes(nor, info);
|
|
#else
|
|
/* Configure the BAR - discover bank cmds and read current bank */
|
|
nor->addr_width = 3;
|
|
ret = read_bar(nor, info);
|
|
if (ret < 0)
|
|
return ret;
|
|
#endif
|
|
} else {
|
|
nor->addr_width = 3;
|
|
}
|
|
|
|
if (nor->addr_width > SPI_NOR_MAX_ADDR_WIDTH) {
|
|
dev_dbg(dev, "address width is too large: %u\n",
|
|
nor->addr_width);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Send all the required SPI flash commands to initialize device */
|
|
nor->info = info;
|
|
ret = spi_nor_init(nor);
|
|
if (ret)
|
|
return ret;
|
|
|
|
nor->name = mtd->name;
|
|
nor->size = mtd->size;
|
|
nor->erase_size = mtd->erasesize;
|
|
nor->sector_size = mtd->erasesize;
|
|
|
|
#ifndef CONFIG_SPL_BUILD
|
|
printf("SF: Detected %s with page size ", nor->name);
|
|
print_size(nor->page_size, ", erase size ");
|
|
print_size(nor->erase_size, ", total ");
|
|
print_size(nor->size, "");
|
|
puts("\n");
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* U-Boot specific functions, need to extend MTD to support these */
|
|
int spi_flash_cmd_get_sw_write_prot(struct spi_nor *nor)
|
|
{
|
|
int sr = read_sr(nor);
|
|
|
|
if (sr < 0)
|
|
return sr;
|
|
|
|
return (sr >> 2) & 7;
|
|
}
|