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![Thierry Reding](/assets/img/avatar_default.png)
Check for card detect each time an MMC/SD device is initialized. If card detection is not implemented, this code behaves as before and continues assuming a card is present. If no card is detected, has_init is reset for the MMC/SD device (to force initialization next time) and an error is returned. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Jason Liu <jason.hui@linaro.org>
358 lines
8.7 KiB
C
358 lines
8.7 KiB
C
/*
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* Copyright (C) 2010
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* Rob Emanuele <rob@emanuele.us>
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* Reinhard Meyer, EMK Elektronik <reinhard.meyer@emk-elektronik.de>
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*
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* Original Driver:
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* Copyright (C) 2004-2006 Atmel Corporation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <mmc.h>
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#include <part.h>
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#include <malloc.h>
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#include <asm/io.h>
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#include <asm/errno.h>
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#include <asm/byteorder.h>
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#include <asm/arch/clk.h>
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#include <asm/arch/hardware.h>
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#include "atmel_mci.h"
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#ifndef CONFIG_SYS_MMC_CLK_OD
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# define CONFIG_SYS_MMC_CLK_OD 150000
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#endif
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#define MMC_DEFAULT_BLKLEN 512
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#if defined(CONFIG_ATMEL_MCI_PORTB)
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# define MCI_BUS 1
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#else
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# define MCI_BUS 0
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#endif
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static int initialized = 0;
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/*
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* Print command and status:
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*
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* - always when DEBUG is defined
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* - on command errors
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*/
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static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg)
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{
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printf("gen_atmel_mci: CMDR %08x (%2u) ARGR %08x (SR: %08x) %s\n",
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cmdr, cmdr&0x3F, arg, status, msg);
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}
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/* Setup for MCI Clock and Block Size */
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static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
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{
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atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
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u32 bus_hz = get_mci_clk_rate();
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u32 clkdiv = 255;
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debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n",
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bus_hz, hz, blklen);
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if (hz > 0) {
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/* find lowest clkdiv yielding a rate <= than requested */
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for (clkdiv=0; clkdiv<255; clkdiv++) {
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if ((bus_hz / (clkdiv+1) / 2) <= hz)
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break;
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}
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}
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printf("mci: setting clock %u Hz, block size %u\n",
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(bus_hz / (clkdiv+1)) / 2, blklen);
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blklen &= 0xfffc;
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/* On some platforms RDPROOF and WRPROOF are ignored */
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writel((MMCI_BF(CLKDIV, clkdiv)
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| MMCI_BF(BLKLEN, blklen)
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| MMCI_BIT(RDPROOF)
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| MMCI_BIT(WRPROOF)), &mci->mr);
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initialized = 1;
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}
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/* Return the CMDR with flags for a given command and data packet */
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static u32 mci_encode_cmd(
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struct mmc_cmd *cmd, struct mmc_data *data, u32* error_flags)
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{
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u32 cmdr = 0;
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/* Default Flags for Errors */
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*error_flags |= (MMCI_BIT(DTOE) | MMCI_BIT(RDIRE) | MMCI_BIT(RENDE) |
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MMCI_BIT(RINDE) | MMCI_BIT(RTOE));
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/* Default Flags for the Command */
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cmdr |= MMCI_BIT(MAXLAT);
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if (data) {
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cmdr |= MMCI_BF(TRCMD, 1);
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if (data->blocks > 1)
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cmdr |= MMCI_BF(TRTYP, 1);
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if (data->flags & MMC_DATA_READ)
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cmdr |= MMCI_BIT(TRDIR);
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}
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if (cmd->resp_type & MMC_RSP_CRC)
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*error_flags |= MMCI_BIT(RCRCE);
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if (cmd->resp_type & MMC_RSP_136)
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cmdr |= MMCI_BF(RSPTYP, 2);
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else if (cmd->resp_type & MMC_RSP_BUSY)
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cmdr |= MMCI_BF(RSPTYP, 3);
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else if (cmd->resp_type & MMC_RSP_PRESENT)
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cmdr |= MMCI_BF(RSPTYP, 1);
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return cmdr | MMCI_BF(CMDNB, cmd->cmdidx);
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}
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/* Entered into function pointer in mci_send_cmd */
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static u32 mci_data_read(atmel_mci_t *mci, u32* data, u32 error_flags)
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{
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u32 status;
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do {
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status = readl(&mci->sr);
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if (status & (error_flags | MMCI_BIT(OVRE)))
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goto io_fail;
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} while (!(status & MMCI_BIT(RXRDY)));
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if (status & MMCI_BIT(RXRDY)) {
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*data = readl(&mci->rdr);
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status = 0;
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}
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io_fail:
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return status;
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}
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/* Entered into function pointer in mci_send_cmd */
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static u32 mci_data_write(atmel_mci_t *mci, u32* data, u32 error_flags)
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{
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u32 status;
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do {
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status = readl(&mci->sr);
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if (status & (error_flags | MMCI_BIT(UNRE)))
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goto io_fail;
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} while (!(status & MMCI_BIT(TXRDY)));
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if (status & MMCI_BIT(TXRDY)) {
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writel(*data, &mci->tdr);
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status = 0;
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}
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io_fail:
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return status;
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}
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/*
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* Entered into mmc structure during driver init
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*
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* Sends a command out on the bus and deals with the block data.
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* Takes the mmc pointer, a command pointer, and an optional data pointer.
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*/
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static int
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mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
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{
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atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
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u32 cmdr;
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u32 error_flags = 0;
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u32 status;
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if (!initialized) {
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puts ("MCI not initialized!\n");
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return COMM_ERR;
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}
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/* Figure out the transfer arguments */
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cmdr = mci_encode_cmd(cmd, data, &error_flags);
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/* Send the command */
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writel(cmd->cmdarg, &mci->argr);
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writel(cmdr, &mci->cmdr);
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#ifdef DEBUG
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dump_cmd(cmdr, cmd->cmdarg, 0, "DEBUG");
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#endif
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/* Wait for the command to complete */
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while (!((status = readl(&mci->sr)) & MMCI_BIT(CMDRDY)));
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if (status & error_flags) {
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dump_cmd(cmdr, cmd->cmdarg, status, "Command Failed");
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return COMM_ERR;
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}
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/* Copy the response to the response buffer */
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if (cmd->resp_type & MMC_RSP_136) {
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cmd->response[0] = readl(&mci->rspr);
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cmd->response[1] = readl(&mci->rspr1);
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cmd->response[2] = readl(&mci->rspr2);
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cmd->response[3] = readl(&mci->rspr3);
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} else
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cmd->response[0] = readl(&mci->rspr);
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/* transfer all of the blocks */
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if (data) {
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u32 word_count, block_count;
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u32* ioptr;
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u32 sys_blocksize, dummy, i;
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u32 (*mci_data_op)
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(atmel_mci_t *mci, u32* data, u32 error_flags);
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if (data->flags & MMC_DATA_READ) {
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mci_data_op = mci_data_read;
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sys_blocksize = mmc->read_bl_len;
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ioptr = (u32*)data->dest;
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} else {
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mci_data_op = mci_data_write;
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sys_blocksize = mmc->write_bl_len;
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ioptr = (u32*)data->src;
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}
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status = 0;
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for (block_count = 0;
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block_count < data->blocks && !status;
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block_count++) {
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word_count = 0;
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do {
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status = mci_data_op(mci, ioptr, error_flags);
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word_count++;
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ioptr++;
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} while (!status && word_count < (data->blocksize/4));
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#ifdef DEBUG
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if (data->flags & MMC_DATA_READ)
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{
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printf("Read Data:\n");
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print_buffer(0, data->dest, 1,
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word_count*4, 0);
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}
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#endif
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#ifdef DEBUG
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if (!status && word_count < (sys_blocksize / 4))
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printf("filling rest of block...\n");
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#endif
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/* fill the rest of a full block */
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while (!status && word_count < (sys_blocksize / 4)) {
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status = mci_data_op(mci, &dummy,
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error_flags);
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word_count++;
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}
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if (status) {
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dump_cmd(cmdr, cmd->cmdarg, status,
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"Data Transfer Failed");
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return COMM_ERR;
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}
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}
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/* Wait for Transfer End */
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i = 0;
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do {
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status = readl(&mci->sr);
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if (status & error_flags) {
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dump_cmd(cmdr, cmd->cmdarg, status,
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"DTIP Wait Failed");
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return COMM_ERR;
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}
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i++;
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} while ((status & MMCI_BIT(DTIP)) && i < 10000);
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if (status & MMCI_BIT(DTIP)) {
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dump_cmd(cmdr, cmd->cmdarg, status,
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"XFER DTIP never unset, ignoring");
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}
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}
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return 0;
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}
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/* Entered into mmc structure during driver init */
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static void mci_set_ios(struct mmc *mmc)
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{
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atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
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int busw = (mmc->bus_width == 4) ? 1 : 0;
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/* Set the clock speed */
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mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN);
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/*
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* set the bus width and select slot for this interface
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* there is no capability for multiple slots on the same interface yet
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* Bitfield SCDBUS needs to be expanded to 2 bits for 8-bit buses
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*/
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writel(MMCI_BF(SCDBUS, busw) | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
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}
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/* Entered into mmc structure during driver init */
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static int mci_init(struct mmc *mmc)
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{
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atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
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/* Initialize controller */
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writel(MMCI_BIT(SWRST), &mci->cr); /* soft reset */
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writel(MMCI_BIT(PWSDIS), &mci->cr); /* disable power save */
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writel(MMCI_BIT(MCIEN), &mci->cr); /* enable mci */
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writel(MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr); /* select port */
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/* Initial Time-outs */
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writel(0x5f, &mci->dtor);
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/* Disable Interrupts */
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writel(~0UL, &mci->idr);
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/* Set default clocks and blocklen */
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mci_set_mode(mmc, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);
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return 0;
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}
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/*
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* This is the only exported function
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*
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* Call it with the MCI register base address
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*/
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int atmel_mci_init(void *regs)
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{
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struct mmc *mmc = malloc(sizeof(struct mmc));
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if (!mmc)
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return -1;
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strcpy(mmc->name, "mci");
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mmc->priv = regs;
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mmc->send_cmd = mci_send_cmd;
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mmc->set_ios = mci_set_ios;
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mmc->init = mci_init;
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mmc->getcd = NULL;
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/* need to be able to pass these in on a board by board basis */
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mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
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mmc->host_caps = MMC_MODE_4BIT;
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/*
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* min and max frequencies determined by
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* max and min of clock divider
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*/
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mmc->f_min = get_mci_clk_rate() / (2*256);
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mmc->f_max = get_mci_clk_rate() / (2*1);
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mmc->b_max = 0;
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mmc_register(mmc);
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return 0;
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}
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