// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
#include <linux/acpi.h>
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dma/qcom-gpi-dma.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/soc/qcom/geni-se.h>
#include <linux/spinlock.h>
#define SE_I2C_TX_TRANS_LEN 0x26c
#define SE_I2C_RX_TRANS_LEN 0x270
#define SE_I2C_SCL_COUNTERS 0x278
#define SE_I2C_ERR (M_CMD_OVERRUN_EN | M_ILLEGAL_CMD_EN | M_CMD_FAILURE_EN |\
M_GP_IRQ_1_EN | M_GP_IRQ_3_EN | M_GP_IRQ_4_EN)
#define SE_I2C_ABORT BIT(1)
/* M_CMD OP codes for I2C */
#define I2C_WRITE 0x1
#define I2C_READ 0x2
#define I2C_WRITE_READ 0x3
#define I2C_ADDR_ONLY 0x4
#define I2C_BUS_CLEAR 0x6
#define I2C_STOP_ON_BUS 0x7
/* M_CMD params for I2C */
#define PRE_CMD_DELAY BIT(0)
#define TIMESTAMP_BEFORE BIT(1)
#define STOP_STRETCH BIT(2)
#define TIMESTAMP_AFTER BIT(3)
#define POST_COMMAND_DELAY BIT(4)
#define IGNORE_ADD_NACK BIT(6)
#define READ_FINISHED_WITH_ACK BIT(7)
#define BYPASS_ADDR_PHASE BIT(8)
#define SLV_ADDR_MSK GENMASK(15, 9)
#define SLV_ADDR_SHFT 9
/* I2C SCL COUNTER fields */
#define HIGH_COUNTER_MSK GENMASK(29, 20)
#define HIGH_COUNTER_SHFT 20
#define LOW_COUNTER_MSK GENMASK(19, 10)
#define LOW_COUNTER_SHFT 10
#define CYCLE_COUNTER_MSK GENMASK(9, 0)
#define I2C_PACK_TX BIT(0)
#define I2C_PACK_RX BIT(1)
enum geni_i2c_err_code {
GP_IRQ0,
NACK,
GP_IRQ2,
BUS_PROTO,
ARB_LOST,
GP_IRQ5,
GENI_OVERRUN,
GENI_ILLEGAL_CMD,
GENI_ABORT_DONE,
GENI_TIMEOUT,
};
#define DM_I2C_CB_ERR ((BIT(NACK) | BIT(BUS_PROTO) | BIT(ARB_LOST)) \
<< 5)
#define I2C_AUTO_SUSPEND_DELAY 250
#define KHZ(freq) (1000 * freq)
#define PACKING_BYTES_PW 4
#define ABORT_TIMEOUT HZ
#define XFER_TIMEOUT HZ
#define RST_TIMEOUT HZ
struct geni_i2c_dev {
struct geni_se se;
u32 tx_wm;
int irq;
int err;
struct i2c_adapter adap;
struct completion done;
struct i2c_msg *cur;
int cur_wr;
int cur_rd;
spinlock_t lock;
struct clk *core_clk;
u32 clk_freq_out;
const struct geni_i2c_clk_fld *clk_fld;
int suspended;
void *dma_buf;
size_t xfer_len;
dma_addr_t dma_addr;
struct dma_chan *tx_c;
struct dma_chan *rx_c;
bool gpi_mode;
bool abort_done;
};
struct geni_i2c_desc {
bool has_core_clk;
char *icc_ddr;
bool no_dma_support;
unsigned int tx_fifo_depth;
};
struct geni_i2c_err_log {
int err;
const char *msg;
};
static const struct geni_i2c_err_log gi2c_log[] = {
[GP_IRQ0] = {-EIO, "Unknown I2C err GP_IRQ0"},
[NACK] = {-ENXIO, "NACK: slv unresponsive, check its power/reset-ln"},
[GP_IRQ2] = {-EIO, "Unknown I2C err GP IRQ2"},
[BUS_PROTO] = {-EPROTO, "Bus proto err, noisy/unexpected start/stop"},
[ARB_LOST] = {-EAGAIN, "Bus arbitration lost, clock line undriveable"},
[GP_IRQ5] = {-EIO, "Unknown I2C err GP IRQ5"},
[GENI_OVERRUN] = {-EIO, "Cmd overrun, check GENI cmd-state machine"},
[GENI_ILLEGAL_CMD] = {-EIO, "Illegal cmd, check GENI cmd-state machine"},
[GENI_ABORT_DONE] = {-ETIMEDOUT, "Abort after timeout successful"},
[GENI_TIMEOUT] = {-ETIMEDOUT, "I2C TXN timed out"},
};
struct geni_i2c_clk_fld {
u32 clk_freq_out;
u8 clk_div;
u8 t_high_cnt;
u8 t_low_cnt;
u8 t_cycle_cnt;
};
/*
* Hardware uses the underlying formula to calculate time periods of
* SCL clock cycle. Firmware uses some additional cycles excluded from the
* below formula and it is confirmed that the time periods are within
* specification limits.
*
* time of high period of SCL: t_high = (t_high_cnt * clk_div) / source_clock
* time of low period of SCL: t_low = (t_low_cnt * clk_div) / source_clock
* time of full period of SCL: t_cycle = (t_cycle_cnt * clk_div) / source_clock
* clk_freq_out = t / t_cycle
* source_clock = 19.2 MHz
*/
static const struct geni_i2c_clk_fld geni_i2c_clk_map[] = {
{KHZ(100), 7, 10, 11, 26},
{KHZ(400), 2, 5, 12, 24},
{KHZ(1000), 1, 3, 9, 18},
};
static int geni_i2c_clk_map_idx(struct geni_i2c_dev *gi2c)
{
int i;
const struct geni_i2c_clk_fld *itr = geni_i2c_clk_map;
for (i = 0; i < ARRAY_SIZE(geni_i2c_clk_map); i++, itr++) {
if (itr->clk_freq_out == gi2c->clk_freq_out) {
gi2c->clk_fld = itr;
return 0;
}
}
return -EINVAL;
}
static void qcom_geni_i2c_conf(struct geni_i2c_dev *gi2c)
{
const struct geni_i2c_clk_fld *itr = gi2c->clk_fld;
u32 val;
writel_relaxed(0, gi2c->se.base + SE_GENI_CLK_SEL);
val = (itr->clk_div << CLK_DIV_SHFT) | SER_CLK_EN;
writel_relaxed(val, gi2c->se.base + GENI_SER_M_CLK_CFG);
val = itr->t_high_cnt << HIGH_COUNTER_SHFT;
val |= itr->t_low_cnt << LOW_COUNTER_SHFT;
val |= itr->t_cycle_cnt;
writel_relaxed(val, gi2c->se.base + SE_I2C_SCL_COUNTERS);
}
static void geni_i2c_err_misc(struct geni_i2c_dev *gi2c)
{
u32 m_cmd = readl_relaxed(gi2c->se.base + SE_GENI_M_CMD0);
u32 m_stat = readl_relaxed(gi2c->se.base + SE_GENI_M_IRQ_STATUS);
u32 geni_s = readl_relaxed(gi2c->se.base + SE_GENI_STATUS);
u32 geni_ios = readl_relaxed(gi2c->se.base + SE_GENI_IOS);
u32 dma = readl_relaxed(gi2c->se.base + SE_GENI_DMA_MODE_EN);
u32 rx_st, tx_st;
if (dma) {
rx_st = readl_relaxed(gi2c->se.base + SE_DMA_RX_IRQ_STAT);
tx_st = readl_relaxed(gi2c->se.base + SE_DMA_TX_IRQ_STAT);
} else {
rx_st = readl_relaxed(gi2c->se.base + SE_GENI_RX_FIFO_STATUS);
tx_st = readl_relaxed(gi2c->se.base + SE_GENI_TX_FIFO_STATUS);
}
dev_dbg(gi2c->se.dev, "DMA:%d tx_stat:0x%x, rx_stat:0x%x, irq-stat:0x%x\n",
dma, tx_st, rx_st, m_stat);
dev_dbg(gi2c->se.dev, "m_cmd:0x%x, geni_status:0x%x, geni_ios:0x%x\n",
m_cmd, geni_s, geni_ios);
}
static void geni_i2c_err(struct geni_i2c_dev *gi2c, int err)
{
if (!gi2c->err)
gi2c->err = gi2c_log[err].err;
if (gi2c->cur)
dev_dbg(gi2c->se.dev, "len:%d, slv-addr:0x%x, RD/WR:%d\n",
gi2c->cur->len, gi2c->cur->addr, gi2c->cur->flags);
switch (err) {
case GENI_ABORT_DONE:
gi2c->abort_done = true;
break;
case NACK:
case GENI_TIMEOUT:
dev_dbg(gi2c->se.dev, "%s\n", gi2c_log[err].msg);
break;
default:
dev_err(gi2c->se.dev, "%s\n", gi2c_log[err].msg);
geni_i2c_err_misc(gi2c);
break;
}
}
static irqreturn_t geni_i2c_irq(int irq, void *dev)
{
struct geni_i2c_dev *gi2c = dev;
void __iomem *base = gi2c->se.base;
int j, p;
u32 m_stat;
u32 rx_st;
u32 dm_tx_st;
u32 dm_rx_st;
u32 dma;
u32 val;
struct i2c_msg *cur;
spin_lock(&gi2c->lock);
m_stat = readl_relaxed(base + SE_GENI_M_IRQ_STATUS);
rx_st = readl_relaxed(base + SE_GENI_RX_FIFO_STATUS);
dm_tx_st = readl_relaxed(base + SE_DMA_TX_IRQ_STAT);
dm_rx_st = readl_relaxed(base + SE_DMA_RX_IRQ_STAT);
dma = readl_relaxed(base + SE_GENI_DMA_MODE_EN);
cur = gi2c->cur;
if (!cur ||
m_stat & (M_CMD_FAILURE_EN | M_CMD_ABORT_EN) ||
dm_rx_st & (DM_I2C_CB_ERR)) {
if (m_stat & M_GP_IRQ_1_EN)
geni_i2c_err(gi2c, NACK);
if (m_stat & M_GP_IRQ_3_EN)
geni_i2c_err(gi2c, BUS_PROTO);
if (m_stat & M_GP_IRQ_4_EN)
geni_i2c_err(gi2c, ARB_LOST);
if (m_stat & M_CMD_OVERRUN_EN)
geni_i2c_err(gi2c, GENI_OVERRUN);
if (m_stat & M_ILLEGAL_CMD_EN)
geni_i2c_err(gi2c, GENI_ILLEGAL_CMD);
if (m_stat & M_CMD_ABORT_EN)
geni_i2c_err(gi2c, GENI_ABORT_DONE);
if (m_stat & M_GP_IRQ_0_EN)
geni_i2c_err(gi2c, GP_IRQ0);
/* Disable the TX Watermark interrupt to stop TX */
if (!dma)
writel_relaxed(0, base + SE_GENI_TX_WATERMARK_REG);
} else if (dma) {
dev_dbg(gi2c->se.dev, "i2c dma tx:0x%x, dma rx:0x%x\n",
dm_tx_st, dm_rx_st);
} else if (cur->flags & I2C_M_RD &&
m_stat & (M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN)) {
u32 rxcnt = rx_st & RX_FIFO_WC_MSK;
for (j = 0; j < rxcnt; j++) {
p = 0;
val = readl_relaxed(base + SE_GENI_RX_FIFOn);
while (gi2c->cur_rd < cur->len && p < sizeof(val)) {
cur->buf[gi2c->cur_rd++] = val & 0xff;
val >>= 8;
p++;
}
if (gi2c->cur_rd == cur->len)
break;
}
} else if (!(cur->flags & I2C_M_RD) &&
m_stat & M_TX_FIFO_WATERMARK_EN) {
for (j = 0; j < gi2c->tx_wm; j++) {
u32 temp;
val = 0;
p = 0;
while (gi2c->cur_wr < cur->len && p < sizeof(val)) {
temp = cur->buf[gi2c->cur_wr++];
val |= temp << (p * 8);
p++;
}
writel_relaxed(val, base + SE_GENI_TX_FIFOn);
/* TX Complete, Disable the TX Watermark interrupt */
if (gi2c->cur_wr == cur->len) {
writel_relaxed(0, base + SE_GENI_TX_WATERMARK_REG);
break;
}
}
}
if (m_stat)
writel_relaxed(m_stat, base + SE_GENI_M_IRQ_CLEAR);
if (dma && dm_tx_st)
writel_relaxed(dm_tx_st, base + SE_DMA_TX_IRQ_CLR);
if (dma && dm_rx_st)
writel_relaxed(dm_rx_st, base + SE_DMA_RX_IRQ_CLR);
/* if this is err with done-bit not set, handle that through timeout. */
if (m_stat & M_CMD_DONE_EN || m_stat & M_CMD_ABORT_EN ||
dm_tx_st & TX_DMA_DONE || dm_tx_st & TX_RESET_DONE ||
dm_rx_st & RX_DMA_DONE || dm_rx_st & RX_RESET_DONE)
complete(&gi2c->done);
spin_unlock(&gi2c->lock);
return IRQ_HANDLED;
}
static void geni_i2c_abort_xfer(struct geni_i2c_dev *gi2c)
{
unsigned long time_left = ABORT_TIMEOUT;
unsigned long flags;
spin_lock_irqsave(&gi2c->lock, flags);
geni_i2c_err(gi2c, GENI_TIMEOUT);
gi2c->cur = NULL;
gi2c->abort_done = false;
geni_se_abort_m_cmd(&gi2c->se);
spin_unlock_irqrestore(&gi2c->lock, flags);
do {
time_left = wait_for_completion_timeout(&gi2c->done, time_left);
} while (!gi2c->abort_done && time_left);
if (!time_left)
dev_err(gi2c->se.dev, "Timeout abort_m_cmd\n");
}
static void geni_i2c_rx_fsm_rst(struct geni_i2c_dev *gi2c)
{
u32 val;
unsigned long time_left = RST_TIMEOUT;
writel_relaxed(1, gi2c->se.base + SE_DMA_RX_FSM_RST);
do {
time_left = wait_for_completion_timeout(&gi2c->done, time_left);
val = readl_relaxed(gi2c->se.base + SE_DMA_RX_IRQ_STAT);
} while (!(val & RX_RESET_DONE) && time_left);
if (!(val & RX_RESET_DONE))
dev_err(gi2c->se.dev, "Timeout resetting RX_FSM\n");
}
static void geni_i2c_tx_fsm_rst(struct geni_i2c_dev *gi2c)
{
u32 val;
unsigned long time_left = RST_TIMEOUT;
writel_relaxed(1, gi2c->se.base + SE_DMA_TX_FSM_RST);
do {
time_left = wait_for_completion_timeout(&gi2c->done, time_left);
val = readl_relaxed(gi2c->se.base + SE_DMA_TX_IRQ_STAT);
} while (!(val & TX_RESET_DONE) && time_left);
if (!(val & TX_RESET_DONE))
dev_err(gi2c->se.dev, "Timeout resetting TX_FSM\n");
}
static void geni_i2c_rx_msg_cleanup(struct geni_i2c_dev *gi2c,
struct i2c_msg *cur)
{
gi2c->cur_rd = 0;
if (gi2c->dma_buf) {
if (gi2c->err)
geni_i2c_rx_fsm_rst(gi2c);
geni_se_rx_dma_unprep(&gi2c->se, gi2c->dma_addr, gi2c->xfer_len);
i2c_put_dma_safe_msg_buf(gi2c->dma_buf, cur, !gi2c->err);
}
}
static void geni_i2c_tx_msg_cleanup(struct geni_i2c_dev *gi2c,
struct i2c_msg *cur)
{
gi2c->cur_wr = 0;
if (gi2c->dma_buf) {
if (gi2c->err)
geni_i2c_tx_fsm_rst(gi2c);
geni_se_tx_dma_unprep(&gi2c->se, gi2c->dma_addr, gi2c->xfer_len);
i2c_put_dma_safe_msg_buf(gi2c->dma_buf, cur, !gi2c->err);
}
}
static int geni_i2c_rx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
u32 m_param)
{
dma_addr_t rx_dma = 0;
unsigned long time_left;
void *dma_buf;
struct geni_se *se = &gi2c->se;
size_t len = msg->len;
struct i2c_msg *cur;
dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
if (dma_buf)
geni_se_select_mode(se, GENI_SE_DMA);
else
geni_se_select_mode(se, GENI_SE_FIFO);
writel_relaxed(len, se->base + SE_I2C_RX_TRANS_LEN);
geni_se_setup_m_cmd(se, I2C_READ, m_param);
if (dma_buf && geni_se_rx_dma_prep(se, dma_buf, len, &rx_dma)) {
geni_se_select_mode(se, GENI_SE_FIFO);
i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
dma_buf = NULL;
} else {
gi2c->xfer_len = len;
gi2c->dma_addr = rx_dma;
gi2c->dma_buf = dma_buf;
}
cur = gi2c->cur;
time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
if (!time_left)
geni_i2c_abort_xfer(gi2c);
geni_i2c_rx_msg_cleanup(gi2c, cur);
return gi2c->err;
}
static int geni_i2c_tx_one_msg(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
u32 m_param)
{
dma_addr_t tx_dma = 0;
unsigned long time_left;
void *dma_buf;
struct geni_se *se = &gi2c->se;
size_t len = msg->len;
struct i2c_msg *cur;
dma_buf = i2c_get_dma_safe_msg_buf(msg, 32);
if (dma_buf)
geni_se_select_mode(se, GENI_SE_DMA);
else
geni_se_select_mode(se, GENI_SE_FIFO);
writel_relaxed(len, se->base + SE_I2C_TX_TRANS_LEN);
geni_se_setup_m_cmd(se, I2C_WRITE, m_param);
if (dma_buf && geni_se_tx_dma_prep(se, dma_buf, len, &tx_dma)) {
geni_se_select_mode(se, GENI_SE_FIFO);
i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
dma_buf = NULL;
} else {
gi2c->xfer_len = len;
gi2c->dma_addr = tx_dma;
gi2c->dma_buf = dma_buf;
}
if (!dma_buf) /* Get FIFO IRQ */
writel_relaxed(1, se->base + SE_GENI_TX_WATERMARK_REG);
cur = gi2c->cur;
time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
if (!time_left)
geni_i2c_abort_xfer(gi2c);
geni_i2c_tx_msg_cleanup(gi2c, cur);
return gi2c->err;
}
static void i2c_gpi_cb_result(void *cb, const struct dmaengine_result *result)
{
struct geni_i2c_dev *gi2c = cb;
if (result->result != DMA_TRANS_NOERROR) {
dev_err(gi2c->se.dev, "DMA txn failed:%d\n", result->result);
gi2c->err = -EIO;
} else if (result->residue) {
dev_dbg(gi2c->se.dev, "DMA xfer has pending: %d\n", result->residue);
}
complete(&gi2c->done);
}
static void geni_i2c_gpi_unmap(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
void *tx_buf, dma_addr_t tx_addr,
void *rx_buf, dma_addr_t rx_addr)
{
if (tx_buf) {
dma_unmap_single(gi2c->se.dev->parent, tx_addr, msg->len, DMA_TO_DEVICE);
i2c_put_dma_safe_msg_buf(tx_buf, msg, !gi2c->err);
}
if (rx_buf) {
dma_unmap_single(gi2c->se.dev->parent, rx_addr, msg->len, DMA_FROM_DEVICE);
i2c_put_dma_safe_msg_buf(rx_buf, msg, !gi2c->err);
}
}
static int geni_i2c_gpi(struct geni_i2c_dev *gi2c, struct i2c_msg *msg,
struct dma_slave_config *config, dma_addr_t *dma_addr_p,
void **buf, unsigned int op, struct dma_chan *dma_chan)
{
struct gpi_i2c_config *peripheral;
unsigned int flags;
void *dma_buf;
dma_addr_t addr;
enum dma_data_direction map_dirn;
enum dma_transfer_direction dma_dirn;
struct dma_async_tx_descriptor *desc;
int ret;
peripheral = config->peripheral_config;
dma_buf = i2c_get_dma_safe_msg_buf(msg, 1);
if (!dma_buf)
return -ENOMEM;
if (op == I2C_WRITE)
map_dirn = DMA_TO_DEVICE;
else
map_dirn = DMA_FROM_DEVICE;
addr = dma_map_single(gi2c->se.dev->parent, dma_buf, msg->len, map_dirn);
if (dma_mapping_error(gi2c->se.dev->parent, addr)) {
i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
return -ENOMEM;
}
/* set the length as message for rx txn */
peripheral->rx_len = msg->len;
peripheral->op = op;
ret = dmaengine_slave_config(dma_chan, config);
if (ret) {
dev_err(gi2c->se.dev, "dma config error: %d for op:%d\n", ret, op);
goto err_config;
}
peripheral->set_config = 0;
peripheral->multi_msg = true;
flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
if (op == I2C_WRITE)
dma_dirn = DMA_MEM_TO_DEV;
else
dma_dirn = DMA_DEV_TO_MEM;
desc = dmaengine_prep_slave_single(dma_chan, addr, msg->len, dma_dirn, flags);
if (!desc) {
dev_err(gi2c->se.dev, "prep_slave_sg failed\n");
ret = -EIO;
goto err_config;
}
desc->callback_result = i2c_gpi_cb_result;
desc->callback_param = gi2c;
dmaengine_submit(desc);
*buf = dma_buf;
*dma_addr_p = addr;
return 0;
err_config:
dma_unmap_single(gi2c->se.dev->parent, addr, msg->len, map_dirn);
i2c_put_dma_safe_msg_buf(dma_buf, msg, false);
return ret;
}
static int geni_i2c_gpi_xfer(struct geni_i2c_dev *gi2c, struct i2c_msg msgs[], int num)
{
struct dma_slave_config config = {};
struct gpi_i2c_config peripheral = {};
int i, ret = 0;
unsigned long time_left;
dma_addr_t tx_addr, rx_addr;
void *tx_buf = NULL, *rx_buf = NULL;
const struct geni_i2c_clk_fld *itr = gi2c->clk_fld;
config.peripheral_config = &peripheral;
config.peripheral_size = sizeof(peripheral);
peripheral.pack_enable = I2C_PACK_TX | I2C_PACK_RX;
peripheral.cycle_count = itr->t_cycle_cnt;
peripheral.high_count = itr->t_high_cnt;
peripheral.low_count = itr->t_low_cnt;
peripheral.clk_div = itr->clk_div;
peripheral.set_config = 1;
peripheral.multi_msg = false;
for (i = 0; i < num; i++) {
gi2c->cur = &msgs[i];
gi2c->err = 0;
dev_dbg(gi2c->se.dev, "msg[%d].len:%d\n", i, gi2c->cur->len);
peripheral.stretch = 0;
if (i < num - 1)
peripheral.stretch = 1;
peripheral.addr = msgs[i].addr;
ret = geni_i2c_gpi(gi2c, &msgs[i], &config,
&tx_addr, &tx_buf, I2C_WRITE, gi2c->tx_c);
if (ret)
goto err;
if (msgs[i].flags & I2C_M_RD) {
ret = geni_i2c_gpi(gi2c, &msgs[i], &config,
&rx_addr, &rx_buf, I2C_READ, gi2c->rx_c);
if (ret)
goto err;
dma_async_issue_pending(gi2c->rx_c);
}
dma_async_issue_pending(gi2c->tx_c);
time_left = wait_for_completion_timeout(&gi2c->done, XFER_TIMEOUT);
if (!time_left)
gi2c->err = -ETIMEDOUT;
if (gi2c->err) {
ret = gi2c->err;
goto err;
}
geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr);
}
return num;
err:
dev_err(gi2c->se.dev, "GPI transfer failed: %d\n", ret);
dmaengine_terminate_sync(gi2c->rx_c);
dmaengine_terminate_sync(gi2c->tx_c);
geni_i2c_gpi_unmap(gi2c, &msgs[i], tx_buf, tx_addr, rx_buf, rx_addr);
return ret;
}
static int geni_i2c_fifo_xfer(struct geni_i2c_dev *gi2c,
struct i2c_msg msgs[], int num)
{
int i, ret = 0;
for (i = 0; i < num; i++) {
u32 m_param = i < (num - 1) ? STOP_STRETCH : 0;
m_param |= ((msgs[i].addr << SLV_ADDR_SHFT) & SLV_ADDR_MSK);
gi2c->cur = &msgs[i];
if (msgs[i].flags & I2C_M_RD)
ret = geni_i2c_rx_one_msg(gi2c, &msgs[i], m_param);
else
ret = geni_i2c_tx_one_msg(gi2c, &msgs[i], m_param);
if (ret)
return ret;
}
return num;
}
static int geni_i2c_xfer(struct i2c_adapter *adap,
struct i2c_msg msgs[],
int num)
{
struct geni_i2c_dev *gi2c = i2c_get_adapdata(adap);
int ret;
gi2c->err = 0;
reinit_completion(&gi2c->done);
ret = pm_runtime_get_sync(gi2c->se.dev);
if (ret < 0) {
dev_err(gi2c->se.dev, "error turning SE resources:%d\n", ret);
pm_runtime_put_noidle(gi2c->se.dev);
/* Set device in suspended since resume failed */
pm_runtime_set_suspended(gi2c->se.dev);
return ret;
}
qcom_geni_i2c_conf(gi2c);
if (gi2c->gpi_mode)
ret = geni_i2c_gpi_xfer(gi2c, msgs, num);
else
ret = geni_i2c_fifo_xfer(gi2c, msgs, num);
pm_runtime_mark_last_busy(gi2c->se.dev);
pm_runtime_put_autosuspend(gi2c->se.dev);
gi2c->cur = NULL;
gi2c->err = 0;
return ret;
}
static u32 geni_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
}
static const struct i2c_algorithm geni_i2c_algo = {
.master_xfer = geni_i2c_xfer,
.functionality = geni_i2c_func,
};
#ifdef CONFIG_ACPI
static const struct acpi_device_id geni_i2c_acpi_match[] = {
{ "QCOM0220"},
{ "QCOM0411" },
{ }
};
MODULE_DEVICE_TABLE(acpi, geni_i2c_acpi_match);
#endif
static void release_gpi_dma(struct geni_i2c_dev *gi2c)
{
if (gi2c->rx_c)
dma_release_channel(gi2c->rx_c);
if (gi2c->tx_c)
dma_release_channel(gi2c->tx_c);
}
static int setup_gpi_dma(struct geni_i2c_dev *gi2c)
{
int ret;
geni_se_select_mode(&gi2c->se, GENI_GPI_DMA);
gi2c->tx_c = dma_request_chan(gi2c->se.dev, "tx");
if (IS_ERR(gi2c->tx_c)) {
ret = dev_err_probe(gi2c->se.dev, PTR_ERR(gi2c->tx_c),
"Failed to get tx DMA ch\n");
goto err_tx;
}
gi2c->rx_c = dma_request_chan(gi2c->se.dev, "rx");
if (IS_ERR(gi2c->rx_c)) {
ret = dev_err_probe(gi2c->se.dev, PTR_ERR(gi2c->rx_c),
"Failed to get rx DMA ch\n");
goto err_rx;
}
dev_dbg(gi2c->se.dev, "Grabbed GPI dma channels\n");
return 0;
err_rx:
dma_release_channel(gi2c->tx_c);
err_tx:
return ret;
}
static int geni_i2c_probe(struct platform_device *pdev)
{
struct geni_i2c_dev *gi2c;
u32 proto, tx_depth, fifo_disable;
int ret;
struct device *dev = &pdev->dev;
const struct geni_i2c_desc *desc = NULL;
gi2c = devm_kzalloc(dev, sizeof(*gi2c), GFP_KERNEL);
if (!gi2c)
return -ENOMEM;
gi2c->se.dev = dev;
gi2c->se.wrapper = dev_get_drvdata(dev->parent);
gi2c->se.base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(gi2c->se.base))
return PTR_ERR(gi2c->se.base);
desc = device_get_match_data(&pdev->dev);
if (desc && desc->has_core_clk) {
gi2c->core_clk = devm_clk_get(dev, "core");
if (IS_ERR(gi2c->core_clk))
return PTR_ERR(gi2c->core_clk);
}
gi2c->se.clk = devm_clk_get(dev, "se");
if (IS_ERR(gi2c->se.clk) && !has_acpi_companion(dev))
return PTR_ERR(gi2c->se.clk);
ret = device_property_read_u32(dev, "clock-frequency",
&gi2c->clk_freq_out);
if (ret) {
dev_info(dev, "Bus frequency not specified, default to 100kHz.\n");
gi2c->clk_freq_out = KHZ(100);
}
if (has_acpi_companion(dev))
ACPI_COMPANION_SET(&gi2c->adap.dev, ACPI_COMPANION(dev));
gi2c->irq = platform_get_irq(pdev, 0);
if (gi2c->irq < 0)
return gi2c->irq;
ret = geni_i2c_clk_map_idx(gi2c);
if (ret) {
dev_err(dev, "Invalid clk frequency %d Hz: %d\n",
gi2c->clk_freq_out, ret);
return ret;
}
gi2c->adap.algo = &geni_i2c_algo;
init_completion(&gi2c->done);
spin_lock_init(&gi2c->lock);
platform_set_drvdata(pdev, gi2c);
ret = devm_request_irq(dev, gi2c->irq, geni_i2c_irq, IRQF_NO_AUTOEN,
dev_name(dev), gi2c);
if (ret) {
dev_err(dev, "Request_irq failed:%d: err:%d\n",
gi2c->irq, ret);
return ret;
}
i2c_set_adapdata(&gi2c->adap, gi2c);
gi2c->adap.dev.parent = dev;
gi2c->adap.dev.of_node = dev->of_node;
strscpy(gi2c->adap.name, "Geni-I2C", sizeof(gi2c->adap.name));
ret = geni_icc_get(&gi2c->se, desc ? desc->icc_ddr : "qup-memory");
if (ret)
return ret;
/*
* Set the bus quota for core and cpu to a reasonable value for
* register access.
* Set quota for DDR based on bus speed.
*/
gi2c->se.icc_paths[GENI_TO_CORE].avg_bw = GENI_DEFAULT_BW;
gi2c->se.icc_paths[CPU_TO_GENI].avg_bw = GENI_DEFAULT_BW;
if (!desc || desc->icc_ddr)
gi2c->se.icc_paths[GENI_TO_DDR].avg_bw = Bps_to_icc(gi2c->clk_freq_out);
ret = geni_icc_set_bw(&gi2c->se);
if (ret)
return ret;
ret = clk_prepare_enable(gi2c->core_clk);
if (ret)
return ret;
ret = geni_se_resources_on(&gi2c->se);
if (ret) {
dev_err(dev, "Error turning on resources %d\n", ret);
clk_disable_unprepare(gi2c->core_clk);
return ret;
}
proto = geni_se_read_proto(&gi2c->se);
if (proto != GENI_SE_I2C) {
dev_err(dev, "Invalid proto %d\n", proto);
geni_se_resources_off(&gi2c->se);
clk_disable_unprepare(gi2c->core_clk);
return -ENXIO;
}
if (desc && desc->no_dma_support)
fifo_disable = false;
else
fifo_disable = readl_relaxed(gi2c->se.base + GENI_IF_DISABLE_RO) & FIFO_IF_DISABLE;
if (fifo_disable) {
/* FIFO is disabled, so we can only use GPI DMA */
gi2c->gpi_mode = true;
ret = setup_gpi_dma(gi2c);
if (ret) {
geni_se_resources_off(&gi2c->se);
clk_disable_unprepare(gi2c->core_clk);
return dev_err_probe(dev, ret, "Failed to setup GPI DMA mode\n");
}
dev_dbg(dev, "Using GPI DMA mode for I2C\n");
} else {
gi2c->gpi_mode = false;
tx_depth = geni_se_get_tx_fifo_depth(&gi2c->se);
/* I2C Master Hub Serial Elements doesn't have the HW_PARAM_0 register */
if (!tx_depth && desc)
tx_depth = desc->tx_fifo_depth;
if (!tx_depth) {
dev_err(dev, "Invalid TX FIFO depth\n");
geni_se_resources_off(&gi2c->se);
clk_disable_unprepare(gi2c->core_clk);
return -EINVAL;
}
gi2c->tx_wm = tx_depth - 1;
geni_se_init(&gi2c->se, gi2c->tx_wm, tx_depth);
geni_se_config_packing(&gi2c->se, BITS_PER_BYTE,
PACKING_BYTES_PW, true, true, true);
dev_dbg(dev, "i2c fifo/se-dma mode. fifo depth:%d\n", tx_depth);
}
clk_disable_unprepare(gi2c->core_clk);
ret = geni_se_resources_off(&gi2c->se);
if (ret) {
dev_err(dev, "Error turning off resources %d\n", ret);
goto err_dma;
}
ret = geni_icc_disable(&gi2c->se);
if (ret)
goto err_dma;
gi2c->suspended = 1;
pm_runtime_set_suspended(gi2c->se.dev);
pm_runtime_set_autosuspend_delay(gi2c->se.dev, I2C_AUTO_SUSPEND_DELAY);
pm_runtime_use_autosuspend(gi2c->se.dev);
pm_runtime_enable(gi2c->se.dev);
ret = i2c_add_adapter(&gi2c->adap);
if (ret) {
dev_err(dev, "Error adding i2c adapter %d\n", ret);
pm_runtime_disable(gi2c->se.dev);
goto err_dma;
}
dev_dbg(dev, "Geni-I2C adaptor successfully added\n");
return 0;
err_dma:
release_gpi_dma(gi2c);
return ret;
}
static void geni_i2c_remove(struct platform_device *pdev)
{
struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev);
i2c_del_adapter(&gi2c->adap);
release_gpi_dma(gi2c);
pm_runtime_disable(gi2c->se.dev);
}
static void geni_i2c_shutdown(struct platform_device *pdev)
{
struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev);
/* Make client i2c transfers start failing */
i2c_mark_adapter_suspended(&gi2c->adap);
}
static int __maybe_unused geni_i2c_runtime_suspend(struct device *dev)
{
int ret;
struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);
disable_irq(gi2c->irq);
ret = geni_se_resources_off(&gi2c->se);
if (ret) {
enable_irq(gi2c->irq);
return ret;
} else {
gi2c->suspended = 1;
}
clk_disable_unprepare(gi2c->core_clk);
return geni_icc_disable(&gi2c->se);
}
static int __maybe_unused geni_i2c_runtime_resume(struct device *dev)
{
int ret;
struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);
ret = geni_icc_enable(&gi2c->se);
if (ret)
return ret;
ret = clk_prepare_enable(gi2c->core_clk);
if (ret)
goto out_icc_disable;
ret = geni_se_resources_on(&gi2c->se);
if (ret)
goto out_clk_disable;
enable_irq(gi2c->irq);
gi2c->suspended = 0;
return 0;
out_clk_disable:
clk_disable_unprepare(gi2c->core_clk);
out_icc_disable:
geni_icc_disable(&gi2c->se);
return ret;
}
static int __maybe_unused geni_i2c_suspend_noirq(struct device *dev)
{
struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);
i2c_mark_adapter_suspended(&gi2c->adap);
if (!gi2c->suspended) {
geni_i2c_runtime_suspend(dev);
pm_runtime_disable(dev);
pm_runtime_set_suspended(dev);
pm_runtime_enable(dev);
}
return 0;
}
static int __maybe_unused geni_i2c_resume_noirq(struct device *dev)
{
struct geni_i2c_dev *gi2c = dev_get_drvdata(dev);
i2c_mark_adapter_resumed(&gi2c->adap);
return 0;
}
static const struct dev_pm_ops geni_i2c_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(geni_i2c_suspend_noirq, geni_i2c_resume_noirq)
SET_RUNTIME_PM_OPS(geni_i2c_runtime_suspend, geni_i2c_runtime_resume,
NULL)
};
static const struct geni_i2c_desc i2c_master_hub = {
.has_core_clk = true,
.icc_ddr = NULL,
.no_dma_support = true,
.tx_fifo_depth = 16,
};
static const struct of_device_id geni_i2c_dt_match[] = {
{ .compatible = "qcom,geni-i2c" },
{ .compatible = "qcom,geni-i2c-master-hub", .data = &i2c_master_hub },
{}
};
MODULE_DEVICE_TABLE(of, geni_i2c_dt_match);
static struct platform_driver geni_i2c_driver = {
.probe = geni_i2c_probe,
.remove_new = geni_i2c_remove,
.shutdown = geni_i2c_shutdown,
.driver = {
.name = "geni_i2c",
.pm = &geni_i2c_pm_ops,
.of_match_table = geni_i2c_dt_match,
.acpi_match_table = ACPI_PTR(geni_i2c_acpi_match),
},
};
module_platform_driver(geni_i2c_driver);
MODULE_DESCRIPTION("I2C Controller Driver for GENI based QUP cores");
MODULE_LICENSE("GPL v2");
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