mirror of
https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
477 lines
11 KiB
C
477 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2013
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* Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
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*/
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#include <common.h>
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#include <i2c.h>
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#ifdef CONFIG_DM_I2C
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#include <dm.h>
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#include <regmap.h>
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#else
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#include <gdsys_fpga.h>
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#endif
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#include <log.h>
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#include <asm/unaligned.h>
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#ifdef CONFIG_DM_I2C
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struct ihs_i2c_priv {
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uint speed;
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struct regmap *map;
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};
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struct ihs_i2c_regs {
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u16 interrupt_status;
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u16 interrupt_enable_control;
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u16 write_mailbox_ext;
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u16 write_mailbox;
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u16 read_mailbox_ext;
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u16 read_mailbox;
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};
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#define ihs_i2c_set(map, member, val) \
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regmap_set(map, struct ihs_i2c_regs, member, val)
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#define ihs_i2c_get(map, member, valp) \
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regmap_get(map, struct ihs_i2c_regs, member, valp)
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#else /* !CONFIG_DM_I2C */
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CONFIG_SYS_I2C_IHS_DUAL
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#define I2C_SET_REG(fld, val) \
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do { \
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if (I2C_ADAP_HWNR & 0x10) \
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FPGA_SET_REG(I2C_ADAP_HWNR & 0xf, i2c1.fld, val); \
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else \
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FPGA_SET_REG(I2C_ADAP_HWNR, i2c0.fld, val); \
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} while (0)
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#else
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#define I2C_SET_REG(fld, val) \
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FPGA_SET_REG(I2C_ADAP_HWNR, i2c0.fld, val)
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#endif
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#ifdef CONFIG_SYS_I2C_IHS_DUAL
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#define I2C_GET_REG(fld, val) \
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do { \
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if (I2C_ADAP_HWNR & 0x10) \
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FPGA_GET_REG(I2C_ADAP_HWNR & 0xf, i2c1.fld, val); \
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else \
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FPGA_GET_REG(I2C_ADAP_HWNR, i2c0.fld, val); \
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} while (0)
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#else
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#define I2C_GET_REG(fld, val) \
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FPGA_GET_REG(I2C_ADAP_HWNR, i2c0.fld, val)
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#endif
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#endif /* CONFIG_DM_I2C */
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enum {
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I2CINT_ERROR_EV = BIT(13),
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I2CINT_TRANSMIT_EV = BIT(14),
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I2CINT_RECEIVE_EV = BIT(15),
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};
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enum {
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I2CMB_READ = 0 << 10,
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I2CMB_WRITE = 1 << 10,
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I2CMB_1BYTE = 0 << 11,
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I2CMB_2BYTE = 1 << 11,
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I2CMB_DONT_HOLD_BUS = 0 << 13,
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I2CMB_HOLD_BUS = 1 << 13,
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I2CMB_NATIVE = 2 << 14,
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};
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enum {
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I2COP_WRITE = 0,
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I2COP_READ = 1,
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};
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#ifdef CONFIG_DM_I2C
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static int wait_for_int(struct udevice *dev, int read)
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#else
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static int wait_for_int(bool read)
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#endif
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{
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u16 val;
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uint ctr = 0;
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#ifdef CONFIG_DM_I2C
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struct ihs_i2c_priv *priv = dev_get_priv(dev);
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#endif
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#ifdef CONFIG_DM_I2C
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ihs_i2c_get(priv->map, interrupt_status, &val);
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#else
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I2C_GET_REG(interrupt_status, &val);
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#endif
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/* Wait until error or receive/transmit interrupt was raised */
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while (!(val & (I2CINT_ERROR_EV
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| (read ? I2CINT_RECEIVE_EV : I2CINT_TRANSMIT_EV)))) {
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udelay(10);
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if (ctr++ > 5000) {
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debug("%s: timed out\n", __func__);
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return -ETIMEDOUT;
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}
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#ifdef CONFIG_DM_I2C
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ihs_i2c_get(priv->map, interrupt_status, &val);
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#else
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I2C_GET_REG(interrupt_status, &val);
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#endif
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}
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return (val & I2CINT_ERROR_EV) ? -EIO : 0;
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}
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#ifdef CONFIG_DM_I2C
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static int ihs_i2c_transfer(struct udevice *dev, uchar chip,
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uchar *buffer, int len, int read, bool is_last)
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#else
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static int ihs_i2c_transfer(uchar chip, uchar *buffer, int len, bool read,
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bool is_last)
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#endif
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{
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u16 val;
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u16 data;
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int res;
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#ifdef CONFIG_DM_I2C
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struct ihs_i2c_priv *priv = dev_get_priv(dev);
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#endif
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/* Clear interrupt status */
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data = I2CINT_ERROR_EV | I2CINT_RECEIVE_EV | I2CINT_TRANSMIT_EV;
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#ifdef CONFIG_DM_I2C
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ihs_i2c_set(priv->map, interrupt_status, data);
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ihs_i2c_get(priv->map, interrupt_status, &val);
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#else
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I2C_SET_REG(interrupt_status, data);
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I2C_GET_REG(interrupt_status, &val);
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#endif
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/* If we want to write and have data, write the bytes to the mailbox */
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if (!read && len) {
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val = buffer[0];
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if (len > 1)
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val |= buffer[1] << 8;
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#ifdef CONFIG_DM_I2C
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ihs_i2c_set(priv->map, write_mailbox_ext, val);
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#else
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I2C_SET_REG(write_mailbox_ext, val);
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#endif
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}
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data = I2CMB_NATIVE
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| (read ? 0 : I2CMB_WRITE)
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| (chip << 1)
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| ((len > 1) ? I2CMB_2BYTE : 0)
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| (is_last ? 0 : I2CMB_HOLD_BUS);
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#ifdef CONFIG_DM_I2C
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ihs_i2c_set(priv->map, write_mailbox, data);
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#else
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I2C_SET_REG(write_mailbox, data);
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#endif
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#ifdef CONFIG_DM_I2C
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res = wait_for_int(dev, read);
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#else
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res = wait_for_int(read);
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#endif
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if (res) {
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if (res == -ETIMEDOUT)
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debug("%s: time out while waiting for event\n", __func__);
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return res;
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}
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/* If we want to read, get the bytes from the mailbox */
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if (read) {
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#ifdef CONFIG_DM_I2C
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ihs_i2c_get(priv->map, read_mailbox_ext, &val);
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#else
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I2C_GET_REG(read_mailbox_ext, &val);
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#endif
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buffer[0] = val & 0xff;
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if (len > 1)
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buffer[1] = val >> 8;
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}
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return 0;
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}
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#ifdef CONFIG_DM_I2C
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static int ihs_i2c_send_buffer(struct udevice *dev, uchar chip, u8 *data, int len, bool hold_bus, int read)
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#else
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static int ihs_i2c_send_buffer(uchar chip, u8 *data, int len, bool hold_bus,
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int read)
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#endif
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{
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int res;
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while (len) {
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int transfer = min(len, 2);
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bool is_last = len <= transfer;
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#ifdef CONFIG_DM_I2C
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res = ihs_i2c_transfer(dev, chip, data, transfer, read,
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hold_bus ? false : is_last);
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#else
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res = ihs_i2c_transfer(chip, data, transfer, read,
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hold_bus ? false : is_last);
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#endif
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if (res)
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return res;
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data += transfer;
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len -= transfer;
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}
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return 0;
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}
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#ifdef CONFIG_DM_I2C
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static int ihs_i2c_address(struct udevice *dev, uchar chip, u8 *addr, int alen,
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bool hold_bus)
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#else
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static int ihs_i2c_address(uchar chip, u8 *addr, int alen, bool hold_bus)
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#endif
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{
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#ifdef CONFIG_DM_I2C
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return ihs_i2c_send_buffer(dev, chip, addr, alen, hold_bus, I2COP_WRITE);
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#else
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return ihs_i2c_send_buffer(chip, addr, alen, hold_bus, I2COP_WRITE);
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#endif
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}
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#ifdef CONFIG_DM_I2C
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static int ihs_i2c_access(struct udevice *dev, uchar chip, u8 *addr,
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int alen, uchar *buffer, int len, int read)
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#else
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static int ihs_i2c_access(struct i2c_adapter *adap, uchar chip, u8 *addr,
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int alen, uchar *buffer, int len, int read)
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#endif
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{
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int res;
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/* Don't hold the bus if length of data to send/receive is zero */
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if (len <= 0)
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return -EINVAL;
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#ifdef CONFIG_DM_I2C
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res = ihs_i2c_address(dev, chip, addr, alen, len);
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#else
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res = ihs_i2c_address(chip, addr, alen, len);
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#endif
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if (res)
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return res;
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#ifdef CONFIG_DM_I2C
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return ihs_i2c_send_buffer(dev, chip, buffer, len, false, read);
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#else
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return ihs_i2c_send_buffer(chip, buffer, len, false, read);
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#endif
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}
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#ifdef CONFIG_DM_I2C
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int ihs_i2c_probe(struct udevice *bus)
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{
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struct ihs_i2c_priv *priv = dev_get_priv(bus);
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regmap_init_mem(dev_ofnode(bus), &priv->map);
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return 0;
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}
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static int ihs_i2c_set_bus_speed(struct udevice *bus, uint speed)
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{
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struct ihs_i2c_priv *priv = dev_get_priv(bus);
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if (speed != priv->speed && priv->speed != 0)
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return -EINVAL;
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priv->speed = speed;
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return 0;
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}
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static int ihs_i2c_xfer(struct udevice *bus, struct i2c_msg *msg, int nmsgs)
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{
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struct i2c_msg *dmsg, *omsg, dummy;
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memset(&dummy, 0, sizeof(struct i2c_msg));
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/* We expect either two messages (one with an offset and one with the
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* actucal data) or one message (just data)
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*/
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if (nmsgs > 2 || nmsgs == 0) {
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debug("%s: Only one or two messages are supported\n", __func__);
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return -ENOTSUPP;
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}
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omsg = nmsgs == 1 ? &dummy : msg;
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dmsg = nmsgs == 1 ? msg : msg + 1;
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if (dmsg->flags & I2C_M_RD)
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return ihs_i2c_access(bus, dmsg->addr, omsg->buf,
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omsg->len, dmsg->buf, dmsg->len,
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I2COP_READ);
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else
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return ihs_i2c_access(bus, dmsg->addr, omsg->buf,
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omsg->len, dmsg->buf, dmsg->len,
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I2COP_WRITE);
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}
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static int ihs_i2c_probe_chip(struct udevice *bus, u32 chip_addr,
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u32 chip_flags)
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{
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uchar buffer[2];
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int res;
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res = ihs_i2c_transfer(bus, chip_addr, buffer, 0, I2COP_READ, true);
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if (res)
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return res;
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return 0;
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}
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static const struct dm_i2c_ops ihs_i2c_ops = {
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.xfer = ihs_i2c_xfer,
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.probe_chip = ihs_i2c_probe_chip,
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.set_bus_speed = ihs_i2c_set_bus_speed,
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};
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static const struct udevice_id ihs_i2c_ids[] = {
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{ .compatible = "gdsys,ihs_i2cmaster", },
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{ /* sentinel */ }
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};
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U_BOOT_DRIVER(i2c_ihs) = {
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.name = "i2c_ihs",
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.id = UCLASS_I2C,
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.of_match = ihs_i2c_ids,
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.probe = ihs_i2c_probe,
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.priv_auto = sizeof(struct ihs_i2c_priv),
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.ops = &ihs_i2c_ops,
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};
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#else /* CONFIG_DM_I2C */
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static void ihs_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
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{
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#ifdef CONFIG_SYS_I2C_INIT_BOARD
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/*
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* Call board specific i2c bus reset routine before accessing the
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* environment, which might be in a chip on that bus. For details
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* about this problem see doc/I2C_Edge_Conditions.
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*/
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i2c_init_board();
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#endif
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}
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static int ihs_i2c_probe(struct i2c_adapter *adap, uchar chip)
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{
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uchar buffer[2];
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int res;
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res = ihs_i2c_transfer(chip, buffer, 0, I2COP_READ, true);
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if (res)
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return res;
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return 0;
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}
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static int ihs_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
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int alen, uchar *buffer, int len)
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{
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u8 addr_bytes[4];
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put_unaligned_le32(addr, addr_bytes);
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return ihs_i2c_access(adap, chip, addr_bytes, alen, buffer, len,
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I2COP_READ);
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}
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static int ihs_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
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int alen, uchar *buffer, int len)
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{
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u8 addr_bytes[4];
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put_unaligned_le32(addr, addr_bytes);
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return ihs_i2c_access(adap, chip, addr_bytes, alen, buffer, len,
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I2COP_WRITE);
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}
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static unsigned int ihs_i2c_set_bus_speed(struct i2c_adapter *adap,
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unsigned int speed)
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{
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if (speed != adap->speed)
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return -EINVAL;
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return speed;
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}
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/*
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* Register IHS i2c adapters
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*/
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#ifdef CONFIG_SYS_I2C_IHS_CH0
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U_BOOT_I2C_ADAP_COMPLETE(ihs0, ihs_i2c_init, ihs_i2c_probe,
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ihs_i2c_read, ihs_i2c_write,
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ihs_i2c_set_bus_speed,
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CONFIG_SYS_I2C_IHS_SPEED_0,
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CONFIG_SYS_I2C_IHS_SLAVE_0, 0)
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#ifdef CONFIG_SYS_I2C_IHS_DUAL
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U_BOOT_I2C_ADAP_COMPLETE(ihs0_1, ihs_i2c_init, ihs_i2c_probe,
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ihs_i2c_read, ihs_i2c_write,
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ihs_i2c_set_bus_speed,
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CONFIG_SYS_I2C_IHS_SPEED_0_1,
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CONFIG_SYS_I2C_IHS_SLAVE_0_1, 16)
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#endif
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#endif
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#ifdef CONFIG_SYS_I2C_IHS_CH1
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U_BOOT_I2C_ADAP_COMPLETE(ihs1, ihs_i2c_init, ihs_i2c_probe,
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ihs_i2c_read, ihs_i2c_write,
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ihs_i2c_set_bus_speed,
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CONFIG_SYS_I2C_IHS_SPEED_1,
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CONFIG_SYS_I2C_IHS_SLAVE_1, 1)
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#ifdef CONFIG_SYS_I2C_IHS_DUAL
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U_BOOT_I2C_ADAP_COMPLETE(ihs1_1, ihs_i2c_init, ihs_i2c_probe,
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ihs_i2c_read, ihs_i2c_write,
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ihs_i2c_set_bus_speed,
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CONFIG_SYS_I2C_IHS_SPEED_1_1,
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CONFIG_SYS_I2C_IHS_SLAVE_1_1, 17)
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#endif
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#endif
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#ifdef CONFIG_SYS_I2C_IHS_CH2
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U_BOOT_I2C_ADAP_COMPLETE(ihs2, ihs_i2c_init, ihs_i2c_probe,
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ihs_i2c_read, ihs_i2c_write,
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ihs_i2c_set_bus_speed,
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CONFIG_SYS_I2C_IHS_SPEED_2,
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CONFIG_SYS_I2C_IHS_SLAVE_2, 2)
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#ifdef CONFIG_SYS_I2C_IHS_DUAL
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U_BOOT_I2C_ADAP_COMPLETE(ihs2_1, ihs_i2c_init, ihs_i2c_probe,
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ihs_i2c_read, ihs_i2c_write,
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ihs_i2c_set_bus_speed,
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CONFIG_SYS_I2C_IHS_SPEED_2_1,
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CONFIG_SYS_I2C_IHS_SLAVE_2_1, 18)
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#endif
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#endif
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#ifdef CONFIG_SYS_I2C_IHS_CH3
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U_BOOT_I2C_ADAP_COMPLETE(ihs3, ihs_i2c_init, ihs_i2c_probe,
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ihs_i2c_read, ihs_i2c_write,
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ihs_i2c_set_bus_speed,
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CONFIG_SYS_I2C_IHS_SPEED_3,
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CONFIG_SYS_I2C_IHS_SLAVE_3, 3)
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#ifdef CONFIG_SYS_I2C_IHS_DUAL
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U_BOOT_I2C_ADAP_COMPLETE(ihs3_1, ihs_i2c_init, ihs_i2c_probe,
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ihs_i2c_read, ihs_i2c_write,
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ihs_i2c_set_bus_speed,
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CONFIG_SYS_I2C_IHS_SPEED_3_1,
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CONFIG_SYS_I2C_IHS_SLAVE_3_1, 19)
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#endif
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#endif
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#endif /* CONFIG_DM_I2C */
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