iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
7735eeebd2
linux/drivers/i2c/busses/i2c-mt65xx.c
Thomas Gleixner 1802d0beec treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation this program is
  distributed in the hope that it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 655 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:41 -07:00

1067 lines
27 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2014 MediaTek Inc.
* Author: Xudong Chen <xudong.chen@mediatek.com>
*/
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>
#define I2C_RS_TRANSFER (1 << 4)
#define I2C_ARB_LOST (1 << 3)
#define I2C_HS_NACKERR (1 << 2)
#define I2C_ACKERR (1 << 1)
#define I2C_TRANSAC_COMP (1 << 0)
#define I2C_TRANSAC_START (1 << 0)
#define I2C_RS_MUL_CNFG (1 << 15)
#define I2C_RS_MUL_TRIG (1 << 14)
#define I2C_DCM_DISABLE 0x0000
#define I2C_IO_CONFIG_OPEN_DRAIN 0x0003
#define I2C_IO_CONFIG_PUSH_PULL 0x0000
#define I2C_SOFT_RST 0x0001
#define I2C_FIFO_ADDR_CLR 0x0001
#define I2C_DELAY_LEN 0x0002
#define I2C_ST_START_CON 0x8001
#define I2C_FS_START_CON 0x1800
#define I2C_TIME_CLR_VALUE 0x0000
#define I2C_TIME_DEFAULT_VALUE 0x0003
#define I2C_WRRD_TRANAC_VALUE 0x0002
#define I2C_RD_TRANAC_VALUE 0x0001
#define I2C_DMA_CON_TX 0x0000
#define I2C_DMA_CON_RX 0x0001
#define I2C_DMA_START_EN 0x0001
#define I2C_DMA_INT_FLAG_NONE 0x0000
#define I2C_DMA_CLR_FLAG 0x0000
#define I2C_DMA_HARD_RST 0x0002
#define I2C_DMA_4G_MODE 0x0001
#define I2C_DEFAULT_CLK_DIV 5
#define I2C_DEFAULT_SPEED 100000 /* hz */
#define MAX_FS_MODE_SPEED 400000
#define MAX_HS_MODE_SPEED 3400000
#define MAX_SAMPLE_CNT_DIV 8
#define MAX_STEP_CNT_DIV 64
#define MAX_HS_STEP_CNT_DIV 8
#define I2C_CONTROL_RS (0x1 << 1)
#define I2C_CONTROL_DMA_EN (0x1 << 2)
#define I2C_CONTROL_CLK_EXT_EN (0x1 << 3)
#define I2C_CONTROL_DIR_CHANGE (0x1 << 4)
#define I2C_CONTROL_ACKERR_DET_EN (0x1 << 5)
#define I2C_CONTROL_TRANSFER_LEN_CHANGE (0x1 << 6)
#define I2C_CONTROL_DMAACK_EN (0x1 << 8)
#define I2C_CONTROL_ASYNC_MODE (0x1 << 9)
#define I2C_CONTROL_WRAPPER (0x1 << 0)
#define I2C_DRV_NAME "i2c-mt65xx"
enum DMA_REGS_OFFSET {
OFFSET_INT_FLAG = 0x0,
OFFSET_INT_EN = 0x04,
OFFSET_EN = 0x08,
OFFSET_RST = 0x0c,
OFFSET_CON = 0x18,
OFFSET_TX_MEM_ADDR = 0x1c,
OFFSET_RX_MEM_ADDR = 0x20,
OFFSET_TX_LEN = 0x24,
OFFSET_RX_LEN = 0x28,
OFFSET_TX_4G_MODE = 0x54,
OFFSET_RX_4G_MODE = 0x58,
};
enum i2c_trans_st_rs {
I2C_TRANS_STOP = 0,
I2C_TRANS_REPEATED_START,
};
enum mtk_trans_op {
I2C_MASTER_WR = 1,
I2C_MASTER_RD,
I2C_MASTER_WRRD,
};
enum I2C_REGS_OFFSET {
OFFSET_DATA_PORT,
OFFSET_SLAVE_ADDR,
OFFSET_INTR_MASK,
OFFSET_INTR_STAT,
OFFSET_CONTROL,
OFFSET_TRANSFER_LEN,
OFFSET_TRANSAC_LEN,
OFFSET_DELAY_LEN,
OFFSET_TIMING,
OFFSET_START,
OFFSET_EXT_CONF,
OFFSET_FIFO_STAT,
OFFSET_FIFO_THRESH,
OFFSET_FIFO_ADDR_CLR,
OFFSET_IO_CONFIG,
OFFSET_RSV_DEBUG,
OFFSET_HS,
OFFSET_SOFTRESET,
OFFSET_DCM_EN,
OFFSET_PATH_DIR,
OFFSET_DEBUGSTAT,
OFFSET_DEBUGCTRL,
OFFSET_TRANSFER_LEN_AUX,
OFFSET_CLOCK_DIV,
OFFSET_LTIMING,
};
static const u16 mt_i2c_regs_v1[] = {
[OFFSET_DATA_PORT] = 0x0,
[OFFSET_SLAVE_ADDR] = 0x4,
[OFFSET_INTR_MASK] = 0x8,
[OFFSET_INTR_STAT] = 0xc,
[OFFSET_CONTROL] = 0x10,
[OFFSET_TRANSFER_LEN] = 0x14,
[OFFSET_TRANSAC_LEN] = 0x18,
[OFFSET_DELAY_LEN] = 0x1c,
[OFFSET_TIMING] = 0x20,
[OFFSET_START] = 0x24,
[OFFSET_EXT_CONF] = 0x28,
[OFFSET_FIFO_STAT] = 0x30,
[OFFSET_FIFO_THRESH] = 0x34,
[OFFSET_FIFO_ADDR_CLR] = 0x38,
[OFFSET_IO_CONFIG] = 0x40,
[OFFSET_RSV_DEBUG] = 0x44,
[OFFSET_HS] = 0x48,
[OFFSET_SOFTRESET] = 0x50,
[OFFSET_DCM_EN] = 0x54,
[OFFSET_PATH_DIR] = 0x60,
[OFFSET_DEBUGSTAT] = 0x64,
[OFFSET_DEBUGCTRL] = 0x68,
[OFFSET_TRANSFER_LEN_AUX] = 0x6c,
[OFFSET_CLOCK_DIV] = 0x70,
};
static const u16 mt_i2c_regs_v2[] = {
[OFFSET_DATA_PORT] = 0x0,
[OFFSET_SLAVE_ADDR] = 0x4,
[OFFSET_INTR_MASK] = 0x8,
[OFFSET_INTR_STAT] = 0xc,
[OFFSET_CONTROL] = 0x10,
[OFFSET_TRANSFER_LEN] = 0x14,
[OFFSET_TRANSAC_LEN] = 0x18,
[OFFSET_DELAY_LEN] = 0x1c,
[OFFSET_TIMING] = 0x20,
[OFFSET_START] = 0x24,
[OFFSET_EXT_CONF] = 0x28,
[OFFSET_LTIMING] = 0x2c,
[OFFSET_HS] = 0x30,
[OFFSET_IO_CONFIG] = 0x34,
[OFFSET_FIFO_ADDR_CLR] = 0x38,
[OFFSET_TRANSFER_LEN_AUX] = 0x44,
[OFFSET_CLOCK_DIV] = 0x48,
[OFFSET_SOFTRESET] = 0x50,
[OFFSET_DEBUGSTAT] = 0xe0,
[OFFSET_DEBUGCTRL] = 0xe8,
[OFFSET_FIFO_STAT] = 0xf4,
[OFFSET_FIFO_THRESH] = 0xf8,
[OFFSET_DCM_EN] = 0xf88,
};
struct mtk_i2c_compatible {
const struct i2c_adapter_quirks *quirks;
const u16 *regs;
unsigned char pmic_i2c: 1;
unsigned char dcm: 1;
unsigned char auto_restart: 1;
unsigned char aux_len_reg: 1;
unsigned char support_33bits: 1;
unsigned char timing_adjust: 1;
unsigned char dma_sync: 1;
unsigned char ltiming_adjust: 1;
};
struct mtk_i2c {
struct i2c_adapter adap; /* i2c host adapter */
struct device *dev;
struct completion msg_complete;
/* set in i2c probe */
void __iomem *base; /* i2c base addr */
void __iomem *pdmabase; /* dma base address*/
struct clk *clk_main; /* main clock for i2c bus */
struct clk *clk_dma; /* DMA clock for i2c via DMA */
struct clk *clk_pmic; /* PMIC clock for i2c from PMIC */
struct clk *clk_arb; /* Arbitrator clock for i2c */
bool have_pmic; /* can use i2c pins from PMIC */
bool use_push_pull; /* IO config push-pull mode */
u16 irq_stat; /* interrupt status */
unsigned int clk_src_div;
unsigned int speed_hz; /* The speed in transfer */
enum mtk_trans_op op;
u16 timing_reg;
u16 high_speed_reg;
u16 ltiming_reg;
unsigned char auto_restart;
bool ignore_restart_irq;
const struct mtk_i2c_compatible *dev_comp;
};
static const struct i2c_adapter_quirks mt6577_i2c_quirks = {
.flags = I2C_AQ_COMB_WRITE_THEN_READ,
.max_num_msgs = 1,
.max_write_len = 255,
.max_read_len = 255,
.max_comb_1st_msg_len = 255,
.max_comb_2nd_msg_len = 31,
};
static const struct i2c_adapter_quirks mt7622_i2c_quirks = {
.max_num_msgs = 255,
};
static const struct mtk_i2c_compatible mt2712_compat = {
.regs = mt_i2c_regs_v1,
.pmic_i2c = 0,
.dcm = 1,
.auto_restart = 1,
.aux_len_reg = 1,
.support_33bits = 1,
.timing_adjust = 1,
.dma_sync = 0,
.ltiming_adjust = 0,
};
static const struct mtk_i2c_compatible mt6577_compat = {
.quirks = &mt6577_i2c_quirks,
.regs = mt_i2c_regs_v1,
.pmic_i2c = 0,
.dcm = 1,
.auto_restart = 0,
.aux_len_reg = 0,
.support_33bits = 0,
.timing_adjust = 0,
.dma_sync = 0,
.ltiming_adjust = 0,
};
static const struct mtk_i2c_compatible mt6589_compat = {
.quirks = &mt6577_i2c_quirks,
.regs = mt_i2c_regs_v1,
.pmic_i2c = 1,
.dcm = 0,
.auto_restart = 0,
.aux_len_reg = 0,
.support_33bits = 0,
.timing_adjust = 0,
.dma_sync = 0,
.ltiming_adjust = 0,
};
static const struct mtk_i2c_compatible mt7622_compat = {
.quirks = &mt7622_i2c_quirks,
.regs = mt_i2c_regs_v1,
.pmic_i2c = 0,
.dcm = 1,
.auto_restart = 1,
.aux_len_reg = 1,
.support_33bits = 0,
.timing_adjust = 0,
.dma_sync = 0,
.ltiming_adjust = 0,
};
static const struct mtk_i2c_compatible mt8173_compat = {
.regs = mt_i2c_regs_v1,
.pmic_i2c = 0,
.dcm = 1,
.auto_restart = 1,
.aux_len_reg = 1,
.support_33bits = 1,
.timing_adjust = 0,
.dma_sync = 0,
.ltiming_adjust = 0,
};
static const struct mtk_i2c_compatible mt8183_compat = {
.regs = mt_i2c_regs_v2,
.pmic_i2c = 0,
.dcm = 0,
.auto_restart = 1,
.aux_len_reg = 1,
.support_33bits = 1,
.timing_adjust = 1,
.dma_sync = 1,
.ltiming_adjust = 1,
};
static const struct of_device_id mtk_i2c_of_match[] = {
{ .compatible = "mediatek,mt2712-i2c", .data = &mt2712_compat },
{ .compatible = "mediatek,mt6577-i2c", .data = &mt6577_compat },
{ .compatible = "mediatek,mt6589-i2c", .data = &mt6589_compat },
{ .compatible = "mediatek,mt7622-i2c", .data = &mt7622_compat },
{ .compatible = "mediatek,mt8173-i2c", .data = &mt8173_compat },
{ .compatible = "mediatek,mt8183-i2c", .data = &mt8183_compat },
{}
};
MODULE_DEVICE_TABLE(of, mtk_i2c_of_match);
static u16 mtk_i2c_readw(struct mtk_i2c *i2c, enum I2C_REGS_OFFSET reg)
{
return readw(i2c->base + i2c->dev_comp->regs[reg]);
}
static void mtk_i2c_writew(struct mtk_i2c *i2c, u16 val,
enum I2C_REGS_OFFSET reg)
{
writew(val, i2c->base + i2c->dev_comp->regs[reg]);
}
static int mtk_i2c_clock_enable(struct mtk_i2c *i2c)
{
int ret;
ret = clk_prepare_enable(i2c->clk_dma);
if (ret)
return ret;
ret = clk_prepare_enable(i2c->clk_main);
if (ret)
goto err_main;
if (i2c->have_pmic) {
ret = clk_prepare_enable(i2c->clk_pmic);
if (ret)
goto err_pmic;
}
if (i2c->clk_arb) {
ret = clk_prepare_enable(i2c->clk_arb);
if (ret)
goto err_arb;
}
return 0;
err_arb:
if (i2c->have_pmic)
clk_disable_unprepare(i2c->clk_pmic);
err_pmic:
clk_disable_unprepare(i2c->clk_main);
err_main:
clk_disable_unprepare(i2c->clk_dma);
return ret;
}
static void mtk_i2c_clock_disable(struct mtk_i2c *i2c)
{
if (i2c->clk_arb)
clk_disable_unprepare(i2c->clk_arb);
if (i2c->have_pmic)
clk_disable_unprepare(i2c->clk_pmic);
clk_disable_unprepare(i2c->clk_main);
clk_disable_unprepare(i2c->clk_dma);
}
static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
{
u16 control_reg;
mtk_i2c_writew(i2c, I2C_SOFT_RST, OFFSET_SOFTRESET);
/* Set ioconfig */
if (i2c->use_push_pull)
mtk_i2c_writew(i2c, I2C_IO_CONFIG_PUSH_PULL, OFFSET_IO_CONFIG);
else
mtk_i2c_writew(i2c, I2C_IO_CONFIG_OPEN_DRAIN, OFFSET_IO_CONFIG);
if (i2c->dev_comp->dcm)
mtk_i2c_writew(i2c, I2C_DCM_DISABLE, OFFSET_DCM_EN);
if (i2c->dev_comp->timing_adjust)
mtk_i2c_writew(i2c, I2C_DEFAULT_CLK_DIV - 1, OFFSET_CLOCK_DIV);
mtk_i2c_writew(i2c, i2c->timing_reg, OFFSET_TIMING);
mtk_i2c_writew(i2c, i2c->high_speed_reg, OFFSET_HS);
if (i2c->dev_comp->ltiming_adjust)
mtk_i2c_writew(i2c, i2c->ltiming_reg, OFFSET_LTIMING);
/* If use i2c pin from PMIC mt6397 side, need set PATH_DIR first */
if (i2c->have_pmic)
mtk_i2c_writew(i2c, I2C_CONTROL_WRAPPER, OFFSET_PATH_DIR);
control_reg = I2C_CONTROL_ACKERR_DET_EN |
I2C_CONTROL_CLK_EXT_EN | I2C_CONTROL_DMA_EN;
if (i2c->dev_comp->dma_sync)
control_reg |= I2C_CONTROL_DMAACK_EN | I2C_CONTROL_ASYNC_MODE;
mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL);
mtk_i2c_writew(i2c, I2C_DELAY_LEN, OFFSET_DELAY_LEN);
writel(I2C_DMA_HARD_RST, i2c->pdmabase + OFFSET_RST);
udelay(50);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST);
}
/*
* Calculate i2c port speed
*
* Hardware design:
* i2c_bus_freq = parent_clk / (clock_div * 2 * sample_cnt * step_cnt)
* clock_div: fixed in hardware, but may be various in different SoCs
*
* The calculation want to pick the highest bus frequency that is still
* less than or equal to i2c->speed_hz. The calculation try to get
* sample_cnt and step_cn
*/
static int mtk_i2c_calculate_speed(struct mtk_i2c *i2c, unsigned int clk_src,
unsigned int target_speed,
unsigned int *timing_step_cnt,
unsigned int *timing_sample_cnt)
{
unsigned int step_cnt;
unsigned int sample_cnt;
unsigned int max_step_cnt;
unsigned int base_sample_cnt = MAX_SAMPLE_CNT_DIV;
unsigned int base_step_cnt;
unsigned int opt_div;
unsigned int best_mul;
unsigned int cnt_mul;
if (target_speed > MAX_HS_MODE_SPEED)
target_speed = MAX_HS_MODE_SPEED;
if (target_speed > MAX_FS_MODE_SPEED)
max_step_cnt = MAX_HS_STEP_CNT_DIV;
else
max_step_cnt = MAX_STEP_CNT_DIV;
base_step_cnt = max_step_cnt;
/* Find the best combination */
opt_div = DIV_ROUND_UP(clk_src >> 1, target_speed);
best_mul = MAX_SAMPLE_CNT_DIV * max_step_cnt;
/* Search for the best pair (sample_cnt, step_cnt) with
* 0 < sample_cnt < MAX_SAMPLE_CNT_DIV
* 0 < step_cnt < max_step_cnt
* sample_cnt * step_cnt >= opt_div
* optimizing for sample_cnt * step_cnt being minimal
*/
for (sample_cnt = 1; sample_cnt <= MAX_SAMPLE_CNT_DIV; sample_cnt++) {
step_cnt = DIV_ROUND_UP(opt_div, sample_cnt);
cnt_mul = step_cnt * sample_cnt;
if (step_cnt > max_step_cnt)
continue;
if (cnt_mul < best_mul) {
best_mul = cnt_mul;
base_sample_cnt = sample_cnt;
base_step_cnt = step_cnt;
if (best_mul == opt_div)
break;
}
}
sample_cnt = base_sample_cnt;
step_cnt = base_step_cnt;
if ((clk_src / (2 * sample_cnt * step_cnt)) > target_speed) {
/* In this case, hardware can't support such
* low i2c_bus_freq
*/
dev_dbg(i2c->dev, "Unsupported speed (%uhz)\n", target_speed);
return -EINVAL;
}
*timing_step_cnt = step_cnt - 1;
*timing_sample_cnt = sample_cnt - 1;
return 0;
}
static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk)
{
unsigned int clk_src;
unsigned int step_cnt;
unsigned int sample_cnt;
unsigned int l_step_cnt;
unsigned int l_sample_cnt;
unsigned int target_speed;
int ret;
clk_src = parent_clk / i2c->clk_src_div;
target_speed = i2c->speed_hz;
if (target_speed > MAX_FS_MODE_SPEED) {
/* Set master code speed register */
ret = mtk_i2c_calculate_speed(i2c, clk_src, MAX_FS_MODE_SPEED,
&l_step_cnt, &l_sample_cnt);
if (ret < 0)
return ret;
i2c->timing_reg = (l_sample_cnt << 8) | l_step_cnt;
/* Set the high speed mode register */
ret = mtk_i2c_calculate_speed(i2c, clk_src, target_speed,
&step_cnt, &sample_cnt);
if (ret < 0)
return ret;
i2c->high_speed_reg = I2C_TIME_DEFAULT_VALUE |
(sample_cnt << 12) | (step_cnt << 8);
if (i2c->dev_comp->ltiming_adjust)
i2c->ltiming_reg = (l_sample_cnt << 6) | l_step_cnt |
(sample_cnt << 12) | (step_cnt << 9);
} else {
ret = mtk_i2c_calculate_speed(i2c, clk_src, target_speed,
&step_cnt, &sample_cnt);
if (ret < 0)
return ret;
i2c->timing_reg = (sample_cnt << 8) | step_cnt;
/* Disable the high speed transaction */
i2c->high_speed_reg = I2C_TIME_CLR_VALUE;
if (i2c->dev_comp->ltiming_adjust)
i2c->ltiming_reg = (sample_cnt << 6) | step_cnt;
}
return 0;
}
static inline u32 mtk_i2c_set_4g_mode(dma_addr_t addr)
{
return (addr & BIT_ULL(32)) ? I2C_DMA_4G_MODE : I2C_DMA_CLR_FLAG;
}
static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs,
int num, int left_num)
{
u16 addr_reg;
u16 start_reg;
u16 control_reg;
u16 restart_flag = 0;
u32 reg_4g_mode;
u8 *dma_rd_buf = NULL;
u8 *dma_wr_buf = NULL;
dma_addr_t rpaddr = 0;
dma_addr_t wpaddr = 0;
int ret;
i2c->irq_stat = 0;
if (i2c->auto_restart)
restart_flag = I2C_RS_TRANSFER;
reinit_completion(&i2c->msg_complete);
control_reg = mtk_i2c_readw(i2c, OFFSET_CONTROL) &
~(I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS);
if ((i2c->speed_hz > MAX_FS_MODE_SPEED) || (left_num >= 1))
control_reg |= I2C_CONTROL_RS;
if (i2c->op == I2C_MASTER_WRRD)
control_reg |= I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS;
mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL);
/* set start condition */
if (i2c->speed_hz <= I2C_DEFAULT_SPEED)
mtk_i2c_writew(i2c, I2C_ST_START_CON, OFFSET_EXT_CONF);
else
mtk_i2c_writew(i2c, I2C_FS_START_CON, OFFSET_EXT_CONF);
addr_reg = i2c_8bit_addr_from_msg(msgs);
mtk_i2c_writew(i2c, addr_reg, OFFSET_SLAVE_ADDR);
/* Clear interrupt status */
mtk_i2c_writew(i2c, restart_flag | I2C_HS_NACKERR | I2C_ACKERR |
I2C_ARB_LOST | I2C_TRANSAC_COMP, OFFSET_INTR_STAT);
mtk_i2c_writew(i2c, I2C_FIFO_ADDR_CLR, OFFSET_FIFO_ADDR_CLR);
/* Enable interrupt */
mtk_i2c_writew(i2c, restart_flag | I2C_HS_NACKERR | I2C_ACKERR |
I2C_ARB_LOST | I2C_TRANSAC_COMP, OFFSET_INTR_MASK);
/* Set transfer and transaction len */
if (i2c->op == I2C_MASTER_WRRD) {
if (i2c->dev_comp->aux_len_reg) {
mtk_i2c_writew(i2c, msgs->len, OFFSET_TRANSFER_LEN);
mtk_i2c_writew(i2c, (msgs + 1)->len,
OFFSET_TRANSFER_LEN_AUX);
} else {
mtk_i2c_writew(i2c, msgs->len | ((msgs + 1)->len) << 8,
OFFSET_TRANSFER_LEN);
}
mtk_i2c_writew(i2c, I2C_WRRD_TRANAC_VALUE, OFFSET_TRANSAC_LEN);
} else {
mtk_i2c_writew(i2c, msgs->len, OFFSET_TRANSFER_LEN);
mtk_i2c_writew(i2c, num, OFFSET_TRANSAC_LEN);
}
/* Prepare buffer data to start transfer */
if (i2c->op == I2C_MASTER_RD) {
writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
writel(I2C_DMA_CON_RX, i2c->pdmabase + OFFSET_CON);
dma_rd_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
if (!dma_rd_buf)
return -ENOMEM;
rpaddr = dma_map_single(i2c->dev, dma_rd_buf,
msgs->len, DMA_FROM_DEVICE);
if (dma_mapping_error(i2c->dev, rpaddr)) {
i2c_put_dma_safe_msg_buf(dma_rd_buf, msgs, false);
return -ENOMEM;
}
if (i2c->dev_comp->support_33bits) {
reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
}
writel((u32)rpaddr, i2c->pdmabase + OFFSET_RX_MEM_ADDR);
writel(msgs->len, i2c->pdmabase + OFFSET_RX_LEN);
} else if (i2c->op == I2C_MASTER_WR) {
writel(I2C_DMA_INT_FLAG_NONE, i2c->pdmabase + OFFSET_INT_FLAG);
writel(I2C_DMA_CON_TX, i2c->pdmabase + OFFSET_CON);
dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
if (!dma_wr_buf)
return -ENOMEM;
wpaddr = dma_map_single(i2c->dev, dma_wr_buf,
msgs->len, DMA_TO_DEVICE);
if (dma_mapping_error(i2c->dev, wpaddr)) {
i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false);
return -ENOMEM;
}
if (i2c->dev_comp->support_33bits) {
reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
}
writel((u32)wpaddr, i2c->pdmabase + OFFSET_TX_MEM_ADDR);
writel(msgs->len, i2c->pdmabase + OFFSET_TX_LEN);
} else {
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_INT_FLAG);
writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_CON);
dma_wr_buf = i2c_get_dma_safe_msg_buf(msgs, 1);
if (!dma_wr_buf)
return -ENOMEM;
wpaddr = dma_map_single(i2c->dev, dma_wr_buf,
msgs->len, DMA_TO_DEVICE);
if (dma_mapping_error(i2c->dev, wpaddr)) {
i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false);
return -ENOMEM;
}
dma_rd_buf = i2c_get_dma_safe_msg_buf((msgs + 1), 1);
if (!dma_rd_buf) {
dma_unmap_single(i2c->dev, wpaddr,
msgs->len, DMA_TO_DEVICE);
i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false);
return -ENOMEM;
}
rpaddr = dma_map_single(i2c->dev, dma_rd_buf,
(msgs + 1)->len,
DMA_FROM_DEVICE);
if (dma_mapping_error(i2c->dev, rpaddr)) {
dma_unmap_single(i2c->dev, wpaddr,
msgs->len, DMA_TO_DEVICE);
i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, false);
i2c_put_dma_safe_msg_buf(dma_rd_buf, (msgs + 1), false);
return -ENOMEM;
}
if (i2c->dev_comp->support_33bits) {
reg_4g_mode = mtk_i2c_set_4g_mode(wpaddr);
writel(reg_4g_mode, i2c->pdmabase + OFFSET_TX_4G_MODE);
reg_4g_mode = mtk_i2c_set_4g_mode(rpaddr);
writel(reg_4g_mode, i2c->pdmabase + OFFSET_RX_4G_MODE);
}
writel((u32)wpaddr, i2c->pdmabase + OFFSET_TX_MEM_ADDR);
writel((u32)rpaddr, i2c->pdmabase + OFFSET_RX_MEM_ADDR);
writel(msgs->len, i2c->pdmabase + OFFSET_TX_LEN);
writel((msgs + 1)->len, i2c->pdmabase + OFFSET_RX_LEN);
}
writel(I2C_DMA_START_EN, i2c->pdmabase + OFFSET_EN);
if (!i2c->auto_restart) {
start_reg = I2C_TRANSAC_START;
} else {
start_reg = I2C_TRANSAC_START | I2C_RS_MUL_TRIG;
if (left_num >= 1)
start_reg |= I2C_RS_MUL_CNFG;
}
mtk_i2c_writew(i2c, start_reg, OFFSET_START);
ret = wait_for_completion_timeout(&i2c->msg_complete,
i2c->adap.timeout);
/* Clear interrupt mask */
mtk_i2c_writew(i2c, ~(restart_flag | I2C_HS_NACKERR | I2C_ACKERR |
I2C_ARB_LOST | I2C_TRANSAC_COMP), OFFSET_INTR_MASK);
if (i2c->op == I2C_MASTER_WR) {
dma_unmap_single(i2c->dev, wpaddr,
msgs->len, DMA_TO_DEVICE);
i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, true);
} else if (i2c->op == I2C_MASTER_RD) {
dma_unmap_single(i2c->dev, rpaddr,
msgs->len, DMA_FROM_DEVICE);
i2c_put_dma_safe_msg_buf(dma_rd_buf, msgs, true);
} else {
dma_unmap_single(i2c->dev, wpaddr, msgs->len,
DMA_TO_DEVICE);
dma_unmap_single(i2c->dev, rpaddr, (msgs + 1)->len,
DMA_FROM_DEVICE);
i2c_put_dma_safe_msg_buf(dma_wr_buf, msgs, true);
i2c_put_dma_safe_msg_buf(dma_rd_buf, (msgs + 1), true);
}
if (ret == 0) {
dev_dbg(i2c->dev, "addr: %x, transfer timeout\n", msgs->addr);
mtk_i2c_init_hw(i2c);
return -ETIMEDOUT;
}
if (i2c->irq_stat & (I2C_HS_NACKERR | I2C_ACKERR)) {
dev_dbg(i2c->dev, "addr: %x, transfer ACK error\n", msgs->addr);
mtk_i2c_init_hw(i2c);
return -ENXIO;
}
return 0;
}
static int mtk_i2c_transfer(struct i2c_adapter *adap,
struct i2c_msg msgs[], int num)
{
int ret;
int left_num = num;
struct mtk_i2c *i2c = i2c_get_adapdata(adap);
ret = mtk_i2c_clock_enable(i2c);
if (ret)
return ret;
i2c->auto_restart = i2c->dev_comp->auto_restart;
/* checking if we can skip restart and optimize using WRRD mode */
if (i2c->auto_restart && num == 2) {
if (!(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD) &&
msgs[0].addr == msgs[1].addr) {
i2c->auto_restart = 0;
}
}
if (i2c->auto_restart && num >= 2 && i2c->speed_hz > MAX_FS_MODE_SPEED)
/* ignore the first restart irq after the master code,
* otherwise the first transfer will be discarded.
*/
i2c->ignore_restart_irq = true;
else
i2c->ignore_restart_irq = false;
while (left_num--) {
if (!msgs->buf) {
dev_dbg(i2c->dev, "data buffer is NULL.\n");
ret = -EINVAL;
goto err_exit;
}
if (msgs->flags & I2C_M_RD)
i2c->op = I2C_MASTER_RD;
else
i2c->op = I2C_MASTER_WR;
if (!i2c->auto_restart) {
if (num > 1) {
/* combined two messages into one transaction */
i2c->op = I2C_MASTER_WRRD;
left_num--;
}
}
/* always use DMA mode. */
ret = mtk_i2c_do_transfer(i2c, msgs, num, left_num);
if (ret < 0)
goto err_exit;
msgs++;
}
/* the return value is number of executed messages */
ret = num;
err_exit:
mtk_i2c_clock_disable(i2c);
return ret;
}
static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id)
{
struct mtk_i2c *i2c = dev_id;
u16 restart_flag = 0;
u16 intr_stat;
if (i2c->auto_restart)
restart_flag = I2C_RS_TRANSFER;
intr_stat = mtk_i2c_readw(i2c, OFFSET_INTR_STAT);
mtk_i2c_writew(i2c, intr_stat, OFFSET_INTR_STAT);
/*
* when occurs ack error, i2c controller generate two interrupts
* first is the ack error interrupt, then the complete interrupt
* i2c->irq_stat need keep the two interrupt value.
*/
i2c->irq_stat |= intr_stat;
if (i2c->ignore_restart_irq && (i2c->irq_stat & restart_flag)) {
i2c->ignore_restart_irq = false;
i2c->irq_stat = 0;
mtk_i2c_writew(i2c, I2C_RS_MUL_CNFG | I2C_RS_MUL_TRIG |
I2C_TRANSAC_START, OFFSET_START);
} else {
if (i2c->irq_stat & (I2C_TRANSAC_COMP | restart_flag))
complete(&i2c->msg_complete);
}
return IRQ_HANDLED;
}
static u32 mtk_i2c_functionality(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
static const struct i2c_algorithm mtk_i2c_algorithm = {
.master_xfer = mtk_i2c_transfer,
.functionality = mtk_i2c_functionality,
};
static int mtk_i2c_parse_dt(struct device_node *np, struct mtk_i2c *i2c)
{
int ret;
ret = of_property_read_u32(np, "clock-frequency", &i2c->speed_hz);
if (ret < 0)
i2c->speed_hz = I2C_DEFAULT_SPEED;
ret = of_property_read_u32(np, "clock-div", &i2c->clk_src_div);
if (ret < 0)
return ret;
if (i2c->clk_src_div == 0)
return -EINVAL;
i2c->have_pmic = of_property_read_bool(np, "mediatek,have-pmic");
i2c->use_push_pull =
of_property_read_bool(np, "mediatek,use-push-pull");
return 0;
}
static int mtk_i2c_probe(struct platform_device *pdev)
{
int ret = 0;
struct mtk_i2c *i2c;
struct clk *clk;
struct resource *res;
int irq;
i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
if (!i2c)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
i2c->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(i2c->base))
return PTR_ERR(i2c->base);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
i2c->pdmabase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(i2c->pdmabase))
return PTR_ERR(i2c->pdmabase);
irq = platform_get_irq(pdev, 0);
if (irq <= 0)
return irq;
init_completion(&i2c->msg_complete);
i2c->dev_comp = of_device_get_match_data(&pdev->dev);
i2c->adap.dev.of_node = pdev->dev.of_node;
i2c->dev = &pdev->dev;
i2c->adap.dev.parent = &pdev->dev;
i2c->adap.owner = THIS_MODULE;
i2c->adap.algo = &mtk_i2c_algorithm;
i2c->adap.quirks = i2c->dev_comp->quirks;
i2c->adap.timeout = 2 * HZ;
i2c->adap.retries = 1;
ret = mtk_i2c_parse_dt(pdev->dev.of_node, i2c);
if (ret)
return -EINVAL;
if (i2c->dev_comp->timing_adjust)
i2c->clk_src_div *= I2C_DEFAULT_CLK_DIV;
if (i2c->have_pmic && !i2c->dev_comp->pmic_i2c)
return -EINVAL;
i2c->clk_main = devm_clk_get(&pdev->dev, "main");
if (IS_ERR(i2c->clk_main)) {
dev_err(&pdev->dev, "cannot get main clock\n");
return PTR_ERR(i2c->clk_main);
}
i2c->clk_dma = devm_clk_get(&pdev->dev, "dma");
if (IS_ERR(i2c->clk_dma)) {
dev_err(&pdev->dev, "cannot get dma clock\n");
return PTR_ERR(i2c->clk_dma);
}
i2c->clk_arb = devm_clk_get(&pdev->dev, "arb");
if (IS_ERR(i2c->clk_arb))
i2c->clk_arb = NULL;
clk = i2c->clk_main;
if (i2c->have_pmic) {
i2c->clk_pmic = devm_clk_get(&pdev->dev, "pmic");
if (IS_ERR(i2c->clk_pmic)) {
dev_err(&pdev->dev, "cannot get pmic clock\n");
return PTR_ERR(i2c->clk_pmic);
}
clk = i2c->clk_pmic;
}
strlcpy(i2c->adap.name, I2C_DRV_NAME, sizeof(i2c->adap.name));
ret = mtk_i2c_set_speed(i2c, clk_get_rate(clk));
if (ret) {
dev_err(&pdev->dev, "Failed to set the speed.\n");
return -EINVAL;
}
if (i2c->dev_comp->support_33bits) {
ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(33));
if (ret) {
dev_err(&pdev->dev, "dma_set_mask return error.\n");
return ret;
}
}
ret = mtk_i2c_clock_enable(i2c);
if (ret) {
dev_err(&pdev->dev, "clock enable failed!\n");
return ret;
}
mtk_i2c_init_hw(i2c);
mtk_i2c_clock_disable(i2c);
ret = devm_request_irq(&pdev->dev, irq, mtk_i2c_irq,
IRQF_TRIGGER_NONE, I2C_DRV_NAME, i2c);
if (ret < 0) {
dev_err(&pdev->dev,
"Request I2C IRQ %d fail\n", irq);
return ret;
}
i2c_set_adapdata(&i2c->adap, i2c);
ret = i2c_add_adapter(&i2c->adap);
if (ret)
return ret;
platform_set_drvdata(pdev, i2c);
return 0;
}
static int mtk_i2c_remove(struct platform_device *pdev)
{
struct mtk_i2c *i2c = platform_get_drvdata(pdev);
i2c_del_adapter(&i2c->adap);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int mtk_i2c_resume(struct device *dev)
{
int ret;
struct mtk_i2c *i2c = dev_get_drvdata(dev);
ret = mtk_i2c_clock_enable(i2c);
if (ret) {
dev_err(dev, "clock enable failed!\n");
return ret;
}
mtk_i2c_init_hw(i2c);
mtk_i2c_clock_disable(i2c);
return 0;
}
#endif
static const struct dev_pm_ops mtk_i2c_pm = {
SET_SYSTEM_SLEEP_PM_OPS(NULL, mtk_i2c_resume)
};
static struct platform_driver mtk_i2c_driver = {
.probe = mtk_i2c_probe,
.remove = mtk_i2c_remove,
.driver = {
.name = I2C_DRV_NAME,
.pm = &mtk_i2c_pm,
.of_match_table = of_match_ptr(mtk_i2c_of_match),
},
};
module_platform_driver(mtk_i2c_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MediaTek I2C Bus Driver");
MODULE_AUTHOR("Xudong Chen <xudong.chen@mediatek.com>");
Reference in New Issue View Git Blame Copy Permalink