i2c: qup: Add V2 tags support

QUP from version 2.1.1 onwards, supports a new format of
i2c command tags. Tag codes instructs the controller to
perform a operation like read/write. This new tagging version
supports bam dma and transfers of more than 256 bytes without 'stop'
in between. Adding the support for the same.

For each block a data_write/read tag and data_len tag is added to
the output fifo. For the final block of data write_stop/read_stop
tag is used.

Signed-off-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Tested-by: Archit Taneja <architt@codeaurora.org>
Tested-by: Telkar Nagender <ntelkar@codeaurora.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Sricharan R 2016-01-19 15:32:42 +05:30 committed by Wolfram Sang
parent c4f0c5fb38
commit 191424bb61

View file

@ -42,6 +42,7 @@
#define QUP_IN_FIFO_BASE 0x218
#define QUP_I2C_CLK_CTL 0x400
#define QUP_I2C_STATUS 0x404
#define QUP_I2C_MASTER_GEN 0x408
/* QUP States and reset values */
#define QUP_RESET_STATE 0
@ -69,6 +70,8 @@
#define QUP_CLOCK_AUTO_GATE BIT(13)
#define I2C_MINI_CORE (2 << 8)
#define I2C_N_VAL 15
#define I2C_N_VAL_V2 7
/* Most significant word offset in FIFO port */
#define QUP_MSW_SHIFT (I2C_N_VAL + 1)
@ -79,6 +82,7 @@
#define QUP_PACK_EN BIT(15)
#define QUP_REPACK_EN (QUP_UNPACK_EN | QUP_PACK_EN)
#define QUP_V2_TAGS_EN 1
#define QUP_OUTPUT_BLOCK_SIZE(x)(((x) >> 0) & 0x03)
#define QUP_OUTPUT_FIFO_SIZE(x) (((x) >> 2) & 0x07)
@ -91,6 +95,13 @@
#define QUP_TAG_STOP (3 << 8)
#define QUP_TAG_REC (4 << 8)
/* QUP v2 tags */
#define QUP_TAG_V2_START 0x81
#define QUP_TAG_V2_DATAWR 0x82
#define QUP_TAG_V2_DATAWR_STOP 0x83
#define QUP_TAG_V2_DATARD 0x85
#define QUP_TAG_V2_DATARD_STOP 0x87
/* Status, Error flags */
#define I2C_STATUS_WR_BUFFER_FULL BIT(0)
#define I2C_STATUS_BUS_ACTIVE BIT(8)
@ -102,6 +113,15 @@
#define RESET_BIT 0x0
#define ONE_BYTE 0x1
struct qup_i2c_block {
int count;
int pos;
int tx_tag_len;
int rx_tag_len;
int data_len;
u8 tags[6];
};
struct qup_i2c_dev {
struct device *dev;
void __iomem *base;
@ -117,6 +137,7 @@ struct qup_i2c_dev {
int in_blk_sz;
unsigned long one_byte_t;
struct qup_i2c_block blk;
struct i2c_msg *msg;
/* Current posion in user message buffer */
@ -263,6 +284,24 @@ static int qup_i2c_wait_ready(struct qup_i2c_dev *qup, int op, bool val,
}
}
static void qup_i2c_set_write_mode_v2(struct qup_i2c_dev *qup,
struct i2c_msg *msg)
{
/* Number of entries to shift out, including the tags */
int total = msg->len + qup->blk.tx_tag_len;
if (total < qup->out_fifo_sz) {
/* FIFO mode */
writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
writel(total, qup->base + QUP_MX_WRITE_CNT);
} else {
/* BLOCK mode (transfer data on chunks) */
writel(QUP_OUTPUT_BLK_MODE | QUP_REPACK_EN,
qup->base + QUP_IO_MODE);
writel(total, qup->base + QUP_MX_OUTPUT_CNT);
}
}
static void qup_i2c_set_write_mode(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
/* Number of entries to shift out, including the start */
@ -324,9 +363,189 @@ static int qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg)
return ret;
}
static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
static void qup_i2c_set_blk_data(struct qup_i2c_dev *qup,
struct i2c_msg *msg)
{
memset(&qup->blk, 0, sizeof(qup->blk));
qup->blk.data_len = msg->len;
qup->blk.count = (msg->len + QUP_READ_LIMIT - 1) / QUP_READ_LIMIT;
/* 4 bytes for first block and 2 writes for rest */
qup->blk.tx_tag_len = 4 + (qup->blk.count - 1) * 2;
/* There are 2 tag bytes that are read in to fifo for every block */
if (msg->flags & I2C_M_RD)
qup->blk.rx_tag_len = qup->blk.count * 2;
}
static int qup_i2c_send_data(struct qup_i2c_dev *qup, int tlen, u8 *tbuf,
int dlen, u8 *dbuf)
{
u32 val = 0, idx = 0, pos = 0, i = 0, t;
int len = tlen + dlen;
u8 *buf = tbuf;
int ret = 0;
while (len > 0) {
ret = qup_i2c_wait_ready(qup, QUP_OUT_FULL,
RESET_BIT, 4 * ONE_BYTE);
if (ret) {
dev_err(qup->dev, "timeout for fifo out full");
return ret;
}
t = (len >= 4) ? 4 : len;
while (idx < t) {
if (!i && (pos >= tlen)) {
buf = dbuf;
pos = 0;
i = 1;
}
val |= buf[pos++] << (idx++ * 8);
}
writel(val, qup->base + QUP_OUT_FIFO_BASE);
idx = 0;
val = 0;
len -= 4;
}
return ret;
}
static int qup_i2c_get_data_len(struct qup_i2c_dev *qup)
{
int data_len;
if (qup->blk.data_len > QUP_READ_LIMIT)
data_len = QUP_READ_LIMIT;
else
data_len = qup->blk.data_len;
return data_len;
}
static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup,
struct i2c_msg *msg)
{
u16 addr = (msg->addr << 1) | ((msg->flags & I2C_M_RD) == I2C_M_RD);
int len = 0;
int data_len;
if (qup->blk.pos == 0) {
tags[len++] = QUP_TAG_V2_START;
tags[len++] = addr & 0xff;
if (msg->flags & I2C_M_TEN)
tags[len++] = addr >> 8;
}
/* Send _STOP commands for the last block */
if (qup->blk.pos == (qup->blk.count - 1)) {
if (msg->flags & I2C_M_RD)
tags[len++] = QUP_TAG_V2_DATARD_STOP;
else
tags[len++] = QUP_TAG_V2_DATAWR_STOP;
} else {
if (msg->flags & I2C_M_RD)
tags[len++] = QUP_TAG_V2_DATARD;
else
tags[len++] = QUP_TAG_V2_DATAWR;
}
data_len = qup_i2c_get_data_len(qup);
/* 0 implies 256 bytes */
if (data_len == QUP_READ_LIMIT)
tags[len++] = 0;
else
tags[len++] = data_len;
return len;
}
static int qup_i2c_issue_xfer_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
int data_len = 0, tag_len, index;
int ret;
tag_len = qup_i2c_set_tags(qup->blk.tags, qup, msg);
index = msg->len - qup->blk.data_len;
/* only tags are written for read */
if (!(msg->flags & I2C_M_RD))
data_len = qup_i2c_get_data_len(qup);
ret = qup_i2c_send_data(qup, tag_len, qup->blk.tags,
data_len, &msg->buf[index]);
qup->blk.data_len -= data_len;
return ret;
}
static int qup_i2c_wait_for_complete(struct qup_i2c_dev *qup,
struct i2c_msg *msg)
{
unsigned long left;
int ret = 0;
left = wait_for_completion_timeout(&qup->xfer, HZ);
if (!left) {
writel(1, qup->base + QUP_SW_RESET);
ret = -ETIMEDOUT;
}
if (qup->bus_err || qup->qup_err) {
if (qup->bus_err & QUP_I2C_NACK_FLAG) {
dev_err(qup->dev, "NACK from %x\n", msg->addr);
ret = -EIO;
}
}
return ret;
}
static int qup_i2c_write_one_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
int ret = 0;
qup->msg = msg;
qup->pos = 0;
enable_irq(qup->irq);
qup_i2c_set_blk_data(qup, msg);
qup_i2c_set_write_mode_v2(qup, msg);
ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
if (ret)
goto err;
writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
do {
ret = qup_i2c_issue_xfer_v2(qup, msg);
if (ret)
goto err;
ret = qup_i2c_wait_for_complete(qup, msg);
if (ret)
goto err;
qup->blk.pos++;
} while (qup->blk.pos < qup->blk.count);
ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, RESET_BIT, ONE_BYTE);
err:
disable_irq(qup->irq);
qup->msg = NULL;
return ret;
}
static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
int ret;
qup->msg = msg;
@ -355,19 +574,9 @@ static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
if (ret)
goto err;
left = wait_for_completion_timeout(&qup->xfer, HZ);
if (!left) {
writel(1, qup->base + QUP_SW_RESET);
ret = -ETIMEDOUT;
ret = qup_i2c_wait_for_complete(qup, msg);
if (ret)
goto err;
}
if (qup->bus_err || qup->qup_err) {
if (qup->bus_err & QUP_I2C_NACK_FLAG)
dev_err(qup->dev, "NACK from %x\n", msg->addr);
ret = -EIO;
goto err;
}
} while (qup->pos < msg->len);
/* Wait for the outstanding data in the fifo to drain */
@ -394,6 +603,26 @@ static void qup_i2c_set_read_mode(struct qup_i2c_dev *qup, int len)
}
}
static void qup_i2c_set_read_mode_v2(struct qup_i2c_dev *qup, int len)
{
int tx_len = qup->blk.tx_tag_len;
len += qup->blk.rx_tag_len;
if (len < qup->in_fifo_sz) {
/* FIFO mode */
writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
writel(len, qup->base + QUP_MX_READ_CNT);
writel(tx_len, qup->base + QUP_MX_WRITE_CNT);
} else {
/* BLOCK mode (transfer data on chunks) */
writel(QUP_INPUT_BLK_MODE | QUP_REPACK_EN,
qup->base + QUP_IO_MODE);
writel(len, qup->base + QUP_MX_INPUT_CNT);
writel(tx_len, qup->base + QUP_MX_OUTPUT_CNT);
}
}
static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
u32 addr, len, val;
@ -434,16 +663,90 @@ static int qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg)
return ret;
}
static int qup_i2c_read_fifo_v2(struct qup_i2c_dev *qup,
struct i2c_msg *msg)
{
u32 val;
int idx, pos = 0, ret = 0, total;
total = qup_i2c_get_data_len(qup);
/* 2 extra bytes for read tags */
while (pos < (total + 2)) {
/* Check that FIFO have data */
ret = qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY,
SET_BIT, 4 * ONE_BYTE);
if (ret) {
dev_err(qup->dev, "timeout for fifo not empty");
return ret;
}
val = readl(qup->base + QUP_IN_FIFO_BASE);
for (idx = 0; idx < 4; idx++, val >>= 8, pos++) {
/* first 2 bytes are tag bytes */
if (pos < 2)
continue;
if (pos >= (total + 2))
goto out;
msg->buf[qup->pos++] = val & 0xff;
}
}
out:
qup->blk.data_len -= total;
return ret;
}
static int qup_i2c_read_one_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
int ret = 0;
qup->msg = msg;
qup->pos = 0;
enable_irq(qup->irq);
qup_i2c_set_blk_data(qup, msg);
qup_i2c_set_read_mode_v2(qup, msg->len);
ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
if (ret)
goto err;
writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
do {
ret = qup_i2c_issue_xfer_v2(qup, msg);
if (ret)
goto err;
ret = qup_i2c_wait_for_complete(qup, msg);
if (ret)
goto err;
ret = qup_i2c_read_fifo_v2(qup, msg);
if (ret)
goto err;
qup->blk.pos++;
} while (qup->blk.pos < qup->blk.count);
err:
disable_irq(qup->irq);
qup->msg = NULL;
return ret;
}
static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
unsigned long left;
int ret;
qup->msg = msg;
qup->pos = 0;
enable_irq(qup->irq);
qup_i2c_set_read_mode(qup, msg->len);
ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
@ -463,19 +766,9 @@ static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
goto err;
do {
left = wait_for_completion_timeout(&qup->xfer, HZ);
if (!left) {
writel(1, qup->base + QUP_SW_RESET);
ret = -ETIMEDOUT;
ret = qup_i2c_wait_for_complete(qup, msg);
if (ret)
goto err;
}
if (qup->bus_err || qup->qup_err) {
if (qup->bus_err & QUP_I2C_NACK_FLAG)
dev_err(qup->dev, "NACK from %x\n", msg->addr);
ret = -EIO;
goto err;
}
ret = qup_i2c_read_fifo(qup, msg);
if (ret)
@ -542,6 +835,60 @@ static int qup_i2c_xfer(struct i2c_adapter *adap,
return ret;
}
static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
struct i2c_msg msgs[],
int num)
{
struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
int ret, idx;
ret = pm_runtime_get_sync(qup->dev);
if (ret < 0)
goto out;
writel(1, qup->base + QUP_SW_RESET);
ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
if (ret)
goto out;
/* Configure QUP as I2C mini core */
writel(I2C_MINI_CORE | I2C_N_VAL_V2, qup->base + QUP_CONFIG);
writel(QUP_V2_TAGS_EN, qup->base + QUP_I2C_MASTER_GEN);
for (idx = 0; idx < num; idx++) {
if (msgs[idx].len == 0) {
ret = -EINVAL;
goto out;
}
if (qup_i2c_poll_state_i2c_master(qup)) {
ret = -EIO;
goto out;
}
reinit_completion(&qup->xfer);
if (msgs[idx].flags & I2C_M_RD)
ret = qup_i2c_read_one_v2(qup, &msgs[idx]);
else
ret = qup_i2c_write_one_v2(qup, &msgs[idx]);
if (!ret)
ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
if (ret)
break;
}
if (ret == 0)
ret = num;
out:
pm_runtime_mark_last_busy(qup->dev);
pm_runtime_put_autosuspend(qup->dev);
return ret;
}
static u32 qup_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
@ -552,6 +899,11 @@ static const struct i2c_algorithm qup_i2c_algo = {
.functionality = qup_i2c_func,
};
static const struct i2c_algorithm qup_i2c_algo_v2 = {
.master_xfer = qup_i2c_xfer_v2,
.functionality = qup_i2c_func,
};
/*
* The QUP block will issue a NACK and STOP on the bus when reaching
* the end of the read, the length of the read is specified as one byte
@ -601,6 +953,13 @@ static int qup_i2c_probe(struct platform_device *pdev)
of_property_read_u32(node, "clock-frequency", &clk_freq);
if (of_device_is_compatible(pdev->dev.of_node, "qcom,i2c-qup-v1.1.1")) {
qup->adap.algo = &qup_i2c_algo;
qup->adap.quirks = &qup_i2c_quirks;
} else {
qup->adap.algo = &qup_i2c_algo_v2;
}
/* We support frequencies up to FAST Mode (400KHz) */
if (!clk_freq || clk_freq > 400000) {
dev_err(qup->dev, "clock frequency not supported %d\n",
@ -696,8 +1055,6 @@ static int qup_i2c_probe(struct platform_device *pdev)
qup->out_blk_sz, qup->out_fifo_sz);
i2c_set_adapdata(&qup->adap, qup);
qup->adap.algo = &qup_i2c_algo;
qup->adap.quirks = &qup_i2c_quirks;
qup->adap.dev.parent = qup->dev;
qup->adap.dev.of_node = pdev->dev.of_node;
strlcpy(qup->adap.name, "QUP I2C adapter", sizeof(qup->adap.name));