mirror of
https://github.com/u-boot/u-boot.git
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482c76e7c3
Improve the error handling and reporting of the IHS I2C driver. Signed-off-by: Mario Six <mario.six@gdsys.cc> Reviewed-by: Heiko Schocher <hs@denx.de>
474 lines
11 KiB
C
474 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 <asm/unaligned.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_alloc_size = 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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