* [PATCH V5 1/6] i2c: qup: Change qup_wait_writeready function to use for all timeouts
2015-11-17 11:45 [PATCH V5 0/6] i2c: qup: Add support for v2 tags and bam dma Sricharan R
@ 2015-11-17 11:45 ` Sricharan R
2016-01-05 3:19 ` [V5, " Andy Gross
2015-11-17 11:45 ` [PATCH V5 2/6] i2c: qup: Add V2 tags support Sricharan R
` (4 subsequent siblings)
5 siblings, 1 reply; 12+ messages in thread
From: Sricharan R @ 2015-11-17 11:45 UTC (permalink / raw)
To: linux-arm-kernel
qup_wait_writeready waits only on a output fifo empty event.
Change the same function to accept the event and data length
to wait as parameters. This way the same function can be used for
timeouts in other places as well.
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
---
drivers/i2c/busses/i2c-qup.c | 67 +++++++++++++++++++++++++++++++-------------
1 file changed, 48 insertions(+), 19 deletions(-)
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index fdcbdab..81ed120 100644
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -98,6 +98,9 @@
#define QUP_STATUS_ERROR_FLAGS 0x7c
#define QUP_READ_LIMIT 256
+#define SET_BIT 0x1
+#define RESET_BIT 0x0
+#define ONE_BYTE 0x1
struct qup_i2c_dev {
struct device *dev;
@@ -221,26 +224,42 @@ static int qup_i2c_change_state(struct qup_i2c_dev *qup, u32 state)
return 0;
}
-static int qup_i2c_wait_writeready(struct qup_i2c_dev *qup)
+/**
+ * qup_i2c_wait_ready - wait for a give number of bytes in tx/rx path
+ * @qup: The qup_i2c_dev device
+ * @op: The bit/event to wait on
+ * @val: value of the bit to wait on, 0 or 1
+ * @len: The length the bytes to be transferred
+ */
+static int qup_i2c_wait_ready(struct qup_i2c_dev *qup, int op, bool val,
+ int len)
{
unsigned long timeout;
u32 opflags;
u32 status;
+ u32 shift = __ffs(op);
- timeout = jiffies + HZ;
+ len *= qup->one_byte_t;
+ /* timeout after a wait of twice the max time */
+ timeout = jiffies + len * 4;
for (;;) {
opflags = readl(qup->base + QUP_OPERATIONAL);
status = readl(qup->base + QUP_I2C_STATUS);
- if (!(opflags & QUP_OUT_NOT_EMPTY) &&
- !(status & I2C_STATUS_BUS_ACTIVE))
- return 0;
+ if (((opflags & op) >> shift) == val) {
+ if (op == QUP_OUT_NOT_EMPTY) {
+ if (!(status & I2C_STATUS_BUS_ACTIVE))
+ return 0;
+ } else {
+ return 0;
+ }
+ }
if (time_after(jiffies, timeout))
return -ETIMEDOUT;
- usleep_range(qup->one_byte_t, qup->one_byte_t * 2);
+ usleep_range(len, len * 2);
}
}
@@ -261,13 +280,13 @@ static void qup_i2c_set_write_mode(struct qup_i2c_dev *qup, struct i2c_msg *msg)
}
}
-static void qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg)
+static int qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
u32 addr = msg->addr << 1;
u32 qup_tag;
- u32 opflags;
int idx;
u32 val;
+ int ret = 0;
if (qup->pos == 0) {
val = QUP_TAG_START | addr;
@@ -279,9 +298,10 @@ static void qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg)
while (qup->pos < msg->len) {
/* Check that there's space in the FIFO for our pair */
- opflags = readl(qup->base + QUP_OPERATIONAL);
- if (opflags & QUP_OUT_FULL)
- break;
+ ret = qup_i2c_wait_ready(qup, QUP_OUT_FULL, RESET_BIT,
+ 4 * ONE_BYTE);
+ if (ret)
+ return ret;
if (qup->pos == msg->len - 1)
qup_tag = QUP_TAG_STOP;
@@ -300,6 +320,8 @@ static void qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg)
qup->pos++;
idx++;
}
+
+ return ret;
}
static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
@@ -325,7 +347,9 @@ static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
if (ret)
goto err;
- qup_i2c_issue_write(qup, msg);
+ ret = qup_i2c_issue_write(qup, msg);
+ if (ret)
+ goto err;
ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
if (ret)
@@ -347,7 +371,7 @@ static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
} while (qup->pos < msg->len);
/* Wait for the outstanding data in the fifo to drain */
- ret = qup_i2c_wait_writeready(qup);
+ ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, RESET_BIT, ONE_BYTE);
err:
disable_irq(qup->irq);
@@ -384,18 +408,19 @@ static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg)
}
-static void qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg)
+static int qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg)
{
- u32 opflags;
u32 val = 0;
int idx;
+ int ret = 0;
for (idx = 0; qup->pos < msg->len; idx++) {
if ((idx & 1) == 0) {
/* Check that FIFO have data */
- opflags = readl(qup->base + QUP_OPERATIONAL);
- if (!(opflags & QUP_IN_NOT_EMPTY))
- break;
+ ret = qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY,
+ SET_BIT, 4 * ONE_BYTE);
+ if (ret)
+ return ret;
/* Reading 2 words at time */
val = readl(qup->base + QUP_IN_FIFO_BASE);
@@ -405,6 +430,8 @@ static void qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg)
msg->buf[qup->pos++] = val >> QUP_MSW_SHIFT;
}
}
+
+ return ret;
}
static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
@@ -450,7 +477,9 @@ static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
goto err;
}
- qup_i2c_read_fifo(qup, msg);
+ ret = qup_i2c_read_fifo(qup, msg);
+ if (ret)
+ goto err;
} while (qup->pos < msg->len);
err:
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH V5 2/6] i2c: qup: Add V2 tags support
2015-11-17 11:45 [PATCH V5 0/6] i2c: qup: Add support for v2 tags and bam dma Sricharan R
2015-11-17 11:45 ` [PATCH V5 1/6] i2c: qup: Change qup_wait_writeready function to use for all timeouts Sricharan R
@ 2015-11-17 11:45 ` Sricharan R
2015-11-17 11:45 ` [PATCH V5 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit Sricharan R
` (3 subsequent siblings)
5 siblings, 0 replies; 12+ messages in thread
From: Sricharan R @ 2015-11-17 11:45 UTC (permalink / raw)
To: linux-arm-kernel
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 <agross@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
---
drivers/i2c/busses/i2c-qup.c | 415 ++++++++++++++++++++++++++++++++++++++++---
1 file changed, 386 insertions(+), 29 deletions(-)
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index 81ed120..715d4d7 100644
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -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;
- 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;
+ ret = qup_i2c_wait_for_complete(qup, msg);
+ if (ret)
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 @@ out:
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));
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH V5 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit
2015-11-17 11:45 [PATCH V5 0/6] i2c: qup: Add support for v2 tags and bam dma Sricharan R
2015-11-17 11:45 ` [PATCH V5 1/6] i2c: qup: Change qup_wait_writeready function to use for all timeouts Sricharan R
2015-11-17 11:45 ` [PATCH V5 2/6] i2c: qup: Add V2 tags support Sricharan R
@ 2015-11-17 11:45 ` Sricharan R
2016-01-09 4:36 ` [V5, " Andy Gross
2015-11-17 11:45 ` [PATCH V5 4/6] i2c: qup: Add bam dma capabilities Sricharan R
` (2 subsequent siblings)
5 siblings, 1 reply; 12+ messages in thread
From: Sricharan R @ 2015-11-17 11:45 UTC (permalink / raw)
To: linux-arm-kernel
The definition of i2c_msg says that
"If this is the last message in a group, it is followed by a STOP.
Otherwise it is followed by the next @i2c_msg transaction segment,
beginning with a (repeated) START"
So the expectation is that there is no 'STOP' bit inbetween individual
i2c_msg segments with repeated 'START'. The QUP i2c hardware has no way
to inform that there should not be a 'STOP' at the end of transaction.
The only way to implement this is to coalesce all the i2c_msg in i2c_msgs
in to one transaction and transfer them. Adding the support for the same.
This is required for some clients like touchscreen which keeps
incrementing counts across individual transfers and 'STOP' bit inbetween
resets the counter, which is not required.
This patch adds the support in non-dma mode.
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
---
drivers/i2c/busses/i2c-qup.c | 34 ++++++++++++++++++++++++++--------
1 file changed, 26 insertions(+), 8 deletions(-)
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index 715d4d7..f9009d6 100644
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -112,6 +112,7 @@
#define SET_BIT 0x1
#define RESET_BIT 0x0
#define ONE_BYTE 0x1
+#define QUP_I2C_MX_CONFIG_DURING_RUN BIT(31)
struct qup_i2c_block {
int count;
@@ -147,6 +148,12 @@ struct qup_i2c_dev {
/* QUP core errors */
u32 qup_err;
+ /* To check if this is the last msg */
+ bool is_last;
+
+ /* To configure when bus is in run state */
+ int config_run;
+
struct completion xfer;
};
@@ -269,7 +276,7 @@ static int qup_i2c_wait_ready(struct qup_i2c_dev *qup, int op, bool val,
status = readl(qup->base + QUP_I2C_STATUS);
if (((opflags & op) >> shift) == val) {
- if (op == QUP_OUT_NOT_EMPTY) {
+ if ((op == QUP_OUT_NOT_EMPTY) && qup->is_last) {
if (!(status & I2C_STATUS_BUS_ACTIVE))
return 0;
} else {
@@ -290,6 +297,8 @@ static void qup_i2c_set_write_mode_v2(struct qup_i2c_dev *qup,
/* Number of entries to shift out, including the tags */
int total = msg->len + qup->blk.tx_tag_len;
+ total |= qup->config_run;
+
if (total < qup->out_fifo_sz) {
/* FIFO mode */
writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE);
@@ -443,7 +452,7 @@ static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup,
}
/* Send _STOP commands for the last block */
- if (qup->blk.pos == (qup->blk.count - 1)) {
+ if ((qup->blk.pos == (qup->blk.count - 1)) && qup->is_last) {
if (msg->flags & I2C_M_RD)
tags[len++] = QUP_TAG_V2_DATARD_STOP;
else
@@ -581,7 +590,6 @@ static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg)
/* Wait for the outstanding data in the fifo to drain */
ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, RESET_BIT, ONE_BYTE);
-
err:
disable_irq(qup->irq);
qup->msg = NULL;
@@ -608,18 +616,20 @@ 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;
+ len |= qup->config_run;
+ tx_len |= qup->config_run;
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);
+ writel(len, qup->base + QUP_MX_READ_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);
+ writel(len, qup->base + QUP_MX_INPUT_CNT);
}
}
@@ -866,6 +876,12 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
goto out;
}
+ qup->is_last = (idx == (num - 1));
+ if (idx)
+ qup->config_run = QUP_I2C_MX_CONFIG_DURING_RUN;
+ else
+ qup->config_run = 0;
+
reinit_completion(&qup->xfer);
if (msgs[idx].flags & I2C_M_RD)
@@ -873,13 +889,13 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
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)
+ ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
+
if (ret == 0)
ret = num;
out:
@@ -1057,6 +1073,8 @@ static int qup_i2c_probe(struct platform_device *pdev)
i2c_set_adapdata(&qup->adap, qup);
qup->adap.dev.parent = qup->dev;
qup->adap.dev.of_node = pdev->dev.of_node;
+ qup->is_last = 1;
+
strlcpy(qup->adap.name, "QUP I2C adapter", sizeof(qup->adap.name));
pm_runtime_set_autosuspend_delay(qup->dev, MSEC_PER_SEC);
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
^ permalink raw reply related [flat|nested] 12+ messages in thread* [V5, 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit
2015-11-17 11:45 ` [PATCH V5 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit Sricharan R
@ 2016-01-09 4:36 ` Andy Gross
0 siblings, 0 replies; 12+ messages in thread
From: Andy Gross @ 2016-01-09 4:36 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, Nov 17, 2015 at 05:15:24PM +0530, Sricharan R wrote:
> The definition of i2c_msg says that
>
> "If this is the last message in a group, it is followed by a STOP.
> Otherwise it is followed by the next @i2c_msg transaction segment,
> beginning with a (repeated) START"
>
> So the expectation is that there is no 'STOP' bit inbetween individual
> i2c_msg segments with repeated 'START'. The QUP i2c hardware has no way
> to inform that there should not be a 'STOP' at the end of transaction.
> The only way to implement this is to coalesce all the i2c_msg in i2c_msgs
> in to one transaction and transfer them. Adding the support for the same.
>
> This is required for some clients like touchscreen which keeps
> incrementing counts across individual transfers and 'STOP' bit inbetween
> resets the counter, which is not required.
>
> This patch adds the support in non-dma mode.
>
> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Reviewed-by: Andy Gross <andy.gross@linaro.org>
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH V5 4/6] i2c: qup: Add bam dma capabilities
2015-11-17 11:45 [PATCH V5 0/6] i2c: qup: Add support for v2 tags and bam dma Sricharan R
` (2 preceding siblings ...)
2015-11-17 11:45 ` [PATCH V5 3/6] i2c: qup: Transfer each i2c_msg in i2c_msgs without a stop bit Sricharan R
@ 2015-11-17 11:45 ` Sricharan R
2016-01-09 4:38 ` [V5,4/6] " Andy Gross
2015-11-17 11:45 ` [PATCH V5 5/6] dts: msm8974: Add blsp2_bam dma node Sricharan R
2015-11-17 11:45 ` [PATCH V5 6/6] dts: msm8974: Add dma channels for blsp2_i2c1 node Sricharan R
5 siblings, 1 reply; 12+ messages in thread
From: Sricharan R @ 2015-11-17 11:45 UTC (permalink / raw)
To: linux-arm-kernel
QUP cores can be attached to a BAM module, which acts as a dma engine for the
QUP core. When DMA with BAM is enabled, the BAM consumer pipe transmitted data
is written to the output FIFO and the BAM producer pipe received data is read
from the input FIFO.
With BAM capabilities, qup-i2c core can transfer more than 256 bytes, without a
'stop' which is not possible otherwise.
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
---
drivers/i2c/busses/i2c-qup.c | 447 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 439 insertions(+), 8 deletions(-)
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index f9009d6..4ca1669 100644
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -14,8 +14,12 @@
*
*/
+#include <linux/atomic.h>
#include <linux/clk.h>
#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/dmapool.h>
+#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
@@ -24,6 +28,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/scatterlist.h>
/* QUP Registers */
#define QUP_CONFIG 0x000
@@ -33,6 +38,7 @@
#define QUP_OPERATIONAL 0x018
#define QUP_ERROR_FLAGS 0x01c
#define QUP_ERROR_FLAGS_EN 0x020
+#define QUP_OPERATIONAL_MASK 0x028
#define QUP_HW_VERSION 0x030
#define QUP_MX_OUTPUT_CNT 0x100
#define QUP_OUT_FIFO_BASE 0x110
@@ -52,6 +58,7 @@
#define QUP_STATE_VALID BIT(2)
#define QUP_I2C_MAST_GEN BIT(4)
+#define QUP_I2C_FLUSH BIT(6)
#define QUP_OPERATIONAL_RESET 0x000ff0
#define QUP_I2C_STATUS_RESET 0xfffffc
@@ -77,7 +84,10 @@
/* Packing/Unpacking words in FIFOs, and IO modes */
#define QUP_OUTPUT_BLK_MODE (1 << 10)
+#define QUP_OUTPUT_BAM_MODE (3 << 10)
#define QUP_INPUT_BLK_MODE (1 << 12)
+#define QUP_INPUT_BAM_MODE (3 << 12)
+#define QUP_BAM_MODE (QUP_OUTPUT_BAM_MODE | QUP_INPUT_BAM_MODE)
#define QUP_UNPACK_EN BIT(14)
#define QUP_PACK_EN BIT(15)
@@ -94,6 +104,8 @@
#define QUP_TAG_DATA (2 << 8)
#define QUP_TAG_STOP (3 << 8)
#define QUP_TAG_REC (4 << 8)
+#define QUP_BAM_INPUT_EOT 0x93
+#define QUP_BAM_FLUSH_STOP 0x96
/* QUP v2 tags */
#define QUP_TAG_V2_START 0x81
@@ -114,6 +126,12 @@
#define ONE_BYTE 0x1
#define QUP_I2C_MX_CONFIG_DURING_RUN BIT(31)
+#define MX_TX_RX_LEN SZ_64K
+#define MX_BLOCKS (MX_TX_RX_LEN / QUP_READ_LIMIT)
+
+/* Max timeout in ms for 32k bytes */
+#define TOUT_MAX 300
+
struct qup_i2c_block {
int count;
int pos;
@@ -123,6 +141,17 @@ struct qup_i2c_block {
u8 tags[6];
};
+struct qup_i2c_tag {
+ u8 *start;
+ dma_addr_t addr;
+};
+
+struct qup_i2c_bam {
+ struct qup_i2c_tag tag;
+ struct dma_chan *dma;
+ struct scatterlist *sg;
+};
+
struct qup_i2c_dev {
struct device *dev;
void __iomem *base;
@@ -154,6 +183,13 @@ struct qup_i2c_dev {
/* To configure when bus is in run state */
int config_run;
+ /* dma parameters */
+ bool is_dma;
+ struct dma_pool *dpool;
+ struct qup_i2c_tag start_tag;
+ struct qup_i2c_bam brx;
+ struct qup_i2c_bam btx;
+
struct completion xfer;
};
@@ -230,6 +266,14 @@ static int qup_i2c_poll_state(struct qup_i2c_dev *qup, u32 req_state)
return qup_i2c_poll_state_mask(qup, req_state, QUP_STATE_MASK);
}
+static void qup_i2c_flush(struct qup_i2c_dev *qup)
+{
+ u32 val = readl(qup->base + QUP_STATE);
+
+ val |= QUP_I2C_FLUSH;
+ writel(val, qup->base + QUP_STATE);
+}
+
static int qup_i2c_poll_state_valid(struct qup_i2c_dev *qup)
{
return qup_i2c_poll_state_mask(qup, 0, 0);
@@ -437,12 +481,14 @@ static int qup_i2c_get_data_len(struct qup_i2c_dev *qup)
}
static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup,
- struct i2c_msg *msg)
+ struct i2c_msg *msg, int is_dma)
{
u16 addr = (msg->addr << 1) | ((msg->flags & I2C_M_RD) == I2C_M_RD);
int len = 0;
int data_len;
+ int last = (qup->blk.pos == (qup->blk.count - 1)) && (qup->is_last);
+
if (qup->blk.pos == 0) {
tags[len++] = QUP_TAG_V2_START;
tags[len++] = addr & 0xff;
@@ -452,7 +498,7 @@ static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup,
}
/* Send _STOP commands for the last block */
- if ((qup->blk.pos == (qup->blk.count - 1)) && qup->is_last) {
+ if (last) {
if (msg->flags & I2C_M_RD)
tags[len++] = QUP_TAG_V2_DATARD_STOP;
else
@@ -472,6 +518,11 @@ static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup,
else
tags[len++] = data_len;
+ if ((msg->flags & I2C_M_RD) && last && is_dma) {
+ tags[len++] = QUP_BAM_INPUT_EOT;
+ tags[len++] = QUP_BAM_FLUSH_STOP;
+ }
+
return len;
}
@@ -480,7 +531,7 @@ 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);
+ tag_len = qup_i2c_set_tags(qup->blk.tags, qup, msg, 0);
index = msg->len - qup->blk.data_len;
/* only tags are written for read */
@@ -494,6 +545,283 @@ static int qup_i2c_issue_xfer_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg)
return ret;
}
+static void qup_i2c_bam_cb(void *data)
+{
+ struct qup_i2c_dev *qup = data;
+
+ complete(&qup->xfer);
+}
+
+void qup_sg_set_buf(struct scatterlist *sg, void *buf, struct qup_i2c_tag *tg,
+ unsigned int buflen, struct qup_i2c_dev *qup,
+ int map, int dir)
+{
+ sg_set_buf(sg, buf, buflen);
+ dma_map_sg(qup->dev, sg, 1, dir);
+
+ if (!map)
+ sg_dma_address(sg) = tg->addr + ((u8 *)buf - tg->start);
+}
+
+static void qup_i2c_rel_dma(struct qup_i2c_dev *qup)
+{
+ if (qup->btx.dma)
+ dma_release_channel(qup->btx.dma);
+ if (qup->brx.dma)
+ dma_release_channel(qup->brx.dma);
+ qup->btx.dma = NULL;
+ qup->brx.dma = NULL;
+}
+
+static int qup_i2c_req_dma(struct qup_i2c_dev *qup)
+{
+ int err;
+
+ if (!qup->btx.dma) {
+ qup->btx.dma = dma_request_slave_channel_reason(qup->dev, "tx");
+ if (IS_ERR(qup->btx.dma)) {
+ err = PTR_ERR(qup->btx.dma);
+ qup->btx.dma = NULL;
+ dev_err(qup->dev, "\n tx channel not available");
+ return err;
+ }
+ }
+
+ if (!qup->brx.dma) {
+ qup->brx.dma = dma_request_slave_channel_reason(qup->dev, "rx");
+ if (IS_ERR(qup->brx.dma)) {
+ dev_err(qup->dev, "\n rx channel not available");
+ err = PTR_ERR(qup->brx.dma);
+ qup->brx.dma = NULL;
+ qup_i2c_rel_dma(qup);
+ return err;
+ }
+ }
+ return 0;
+}
+
+static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
+ int num)
+{
+ struct dma_async_tx_descriptor *txd, *rxd = NULL;
+ int ret = 0, idx = 0;
+ dma_cookie_t cookie_rx, cookie_tx;
+ u32 rx_nents = 0, tx_nents = 0, len, blocks, rem;
+ u32 i, tlen, tx_len, tx_buf = 0, rx_buf = 0, off = 0;
+ u8 *tags;
+
+ while (idx < num) {
+ blocks = (msg->len + QUP_READ_LIMIT) / QUP_READ_LIMIT;
+ rem = msg->len % QUP_READ_LIMIT;
+ tx_len = 0, len = 0, i = 0;
+
+ qup->is_last = (idx == (num - 1));
+
+ qup_i2c_set_blk_data(qup, msg);
+
+ if (msg->flags & I2C_M_RD) {
+ rx_nents += (blocks * 2) + 1;
+ tx_nents += 1;
+
+ while (qup->blk.pos < blocks) {
+ /* length set to '0' implies 256 bytes */
+ tlen = (i == (blocks - 1)) ? rem : 0;
+ tags = &qup->start_tag.start[off + len];
+ len += qup_i2c_set_tags(tags, qup, msg, 1);
+
+ /* scratch buf to read the start and len tags */
+ qup_sg_set_buf(&qup->brx.sg[rx_buf++],
+ &qup->brx.tag.start[0],
+ &qup->brx.tag,
+ 2, qup, 0, 0);
+
+ qup_sg_set_buf(&qup->brx.sg[rx_buf++],
+ &msg->buf[QUP_READ_LIMIT * i],
+ NULL, tlen, qup,
+ 1, DMA_FROM_DEVICE);
+ i++;
+ qup->blk.pos = i;
+ }
+ qup_sg_set_buf(&qup->btx.sg[tx_buf++],
+ &qup->start_tag.start[off],
+ &qup->start_tag, len, qup, 0, 0);
+ off += len;
+ /* scratch buf to read the BAM EOT and FLUSH tags */
+ qup_sg_set_buf(&qup->brx.sg[rx_buf++],
+ &qup->brx.tag.start[0],
+ &qup->brx.tag, 2,
+ qup, 0, 0);
+ } else {
+ tx_nents += (blocks * 2);
+
+ while (qup->blk.pos < blocks) {
+ tlen = (i == (blocks - 1)) ? rem : 0;
+ tags = &qup->start_tag.start[off + tx_len];
+ len = qup_i2c_set_tags(tags, qup, msg, 1);
+
+ qup_sg_set_buf(&qup->btx.sg[tx_buf++],
+ tags,
+ &qup->start_tag, len,
+ qup, 0, 0);
+
+ tx_len += len;
+ qup_sg_set_buf(&qup->btx.sg[tx_buf++],
+ &msg->buf[QUP_READ_LIMIT * i],
+ NULL, tlen, qup, 1,
+ DMA_TO_DEVICE);
+ i++;
+ qup->blk.pos = i;
+ }
+ off += tx_len;
+
+ if (idx == (num - 1)) {
+ len = 1;
+ if (rx_nents) {
+ qup->btx.tag.start[0] =
+ QUP_BAM_INPUT_EOT;
+ len++;
+ }
+ qup->btx.tag.start[len - 1] =
+ QUP_BAM_FLUSH_STOP;
+ qup_sg_set_buf(&qup->btx.sg[tx_buf++],
+ &qup->btx.tag.start[0],
+ &qup->btx.tag, len,
+ qup, 0, 0);
+ tx_nents += 1;
+ }
+ }
+ idx++;
+ msg++;
+ }
+
+ txd = dmaengine_prep_slave_sg(qup->btx.dma, qup->btx.sg, tx_nents,
+ DMA_MEM_TO_DEV,
+ DMA_PREP_INTERRUPT | DMA_PREP_FENCE);
+ if (!txd) {
+ dev_err(qup->dev, "failed to get tx desc\n");
+ ret = -EINVAL;
+ goto desc_err;
+ }
+
+ if (!rx_nents) {
+ txd->callback = qup_i2c_bam_cb;
+ txd->callback_param = qup;
+ }
+
+ cookie_tx = dmaengine_submit(txd);
+ if (dma_submit_error(cookie_tx)) {
+ ret = -EINVAL;
+ goto desc_err;
+ }
+
+ dma_async_issue_pending(qup->btx.dma);
+
+ if (rx_nents) {
+ rxd = dmaengine_prep_slave_sg(qup->brx.dma, qup->brx.sg,
+ rx_nents, DMA_DEV_TO_MEM,
+ DMA_PREP_INTERRUPT);
+ if (!rxd) {
+ dev_err(qup->dev, "failed to get rx desc\n");
+ ret = -EINVAL;
+
+ /* abort TX descriptors */
+ dmaengine_terminate_all(qup->btx.dma);
+ goto desc_err;
+ }
+
+ rxd->callback = qup_i2c_bam_cb;
+ rxd->callback_param = qup;
+ cookie_rx = dmaengine_submit(rxd);
+ if (dma_submit_error(cookie_rx)) {
+ ret = -EINVAL;
+ goto desc_err;
+ }
+
+ dma_async_issue_pending(qup->brx.dma);
+ }
+
+ if (!wait_for_completion_timeout(&qup->xfer, TOUT_MAX * HZ)) {
+ dev_err(qup->dev, "normal trans timed out\n");
+ ret = -ETIMEDOUT;
+ }
+
+ if (ret || qup->bus_err || qup->qup_err) {
+ if (qup->bus_err & QUP_I2C_NACK_FLAG) {
+ msg--;
+ dev_err(qup->dev, "NACK from %x\n", msg->addr);
+ ret = -EIO;
+
+ if (qup_i2c_change_state(qup, QUP_RUN_STATE)) {
+ dev_err(qup->dev, "change to run state timed out");
+ return ret;
+ }
+
+ if (rx_nents)
+ writel(QUP_BAM_INPUT_EOT,
+ qup->base + QUP_OUT_FIFO_BASE);
+
+ writel(QUP_BAM_FLUSH_STOP,
+ qup->base + QUP_OUT_FIFO_BASE);
+
+ qup_i2c_flush(qup);
+
+ /* wait for remaining interrupts to occur */
+ if (!wait_for_completion_timeout(&qup->xfer, HZ))
+ dev_err(qup->dev, "flush timed out\n");
+
+ qup_i2c_rel_dma(qup);
+ }
+ }
+
+ dma_unmap_sg(qup->dev, qup->btx.sg, tx_nents, DMA_TO_DEVICE);
+
+ if (rx_nents)
+ dma_unmap_sg(qup->dev, qup->brx.sg, rx_nents,
+ DMA_FROM_DEVICE);
+desc_err:
+ return ret;
+}
+
+static int qup_i2c_bam_xfer(struct i2c_adapter *adap, struct i2c_msg *msg,
+ int num)
+{
+ struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
+ int ret = 0;
+
+ enable_irq(qup->irq);
+ ret = qup_i2c_req_dma(qup);
+
+ if (ret)
+ goto out;
+
+ qup->bus_err = 0;
+ qup->qup_err = 0;
+
+ writel(0, qup->base + QUP_MX_INPUT_CNT);
+ writel(0, qup->base + QUP_MX_OUTPUT_CNT);
+
+ /* set BAM mode */
+ writel(QUP_REPACK_EN | QUP_BAM_MODE, qup->base + QUP_IO_MODE);
+
+ /* mask fifo irqs */
+ writel((0x3 << 8), qup->base + QUP_OPERATIONAL_MASK);
+
+ /* set RUN STATE */
+ ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
+ if (ret)
+ goto out;
+
+ writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
+
+ qup->msg = msg;
+ ret = qup_i2c_bam_do_xfer(qup, qup->msg, num);
+out:
+ disable_irq(qup->irq);
+
+ qup->msg = NULL;
+ return ret;
+}
+
static int qup_i2c_wait_for_complete(struct qup_i2c_dev *qup,
struct i2c_msg *msg)
{
@@ -850,7 +1178,7 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
int num)
{
struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
- int ret, idx;
+ int ret, idx, len, use_dma = 0;
ret = pm_runtime_get_sync(qup->dev);
if (ret < 0)
@@ -865,6 +1193,28 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
writel(I2C_MINI_CORE | I2C_N_VAL_V2, qup->base + QUP_CONFIG);
writel(QUP_V2_TAGS_EN, qup->base + QUP_I2C_MASTER_GEN);
+ if ((qup->is_dma)) {
+ /* All i2c_msgs should be transferred using either dma or cpu */
+ for (idx = 0; idx < num; idx++) {
+ if (msgs[idx].len == 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ len = (msgs[idx].len > qup->out_fifo_sz) ||
+ (msgs[idx].len > qup->in_fifo_sz);
+
+ if ((!is_vmalloc_addr(msgs[idx].buf)) && len) {
+ use_dma = 1;
+ } else {
+ use_dma = 0;
+ break;
+ }
+ }
+ }
+
+ use_dma = 1;
+
for (idx = 0; idx < num; idx++) {
if (msgs[idx].len == 0) {
ret = -EINVAL;
@@ -877,6 +1227,7 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
}
qup->is_last = (idx == (num - 1));
+
if (idx)
qup->config_run = QUP_I2C_MX_CONFIG_DURING_RUN;
else
@@ -884,10 +1235,15 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
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 (use_dma) {
+ ret = qup_i2c_bam_xfer(adap, &msgs[idx], num);
+ break;
+ } else {
+ 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)
break;
@@ -958,6 +1314,7 @@ static int qup_i2c_probe(struct platform_device *pdev)
int ret, fs_div, hs_div;
int src_clk_freq;
u32 clk_freq = 100000;
+ int blocks;
qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL);
if (!qup)
@@ -974,8 +1331,65 @@ static int qup_i2c_probe(struct platform_device *pdev)
qup->adap.quirks = &qup_i2c_quirks;
} else {
qup->adap.algo = &qup_i2c_algo_v2;
+ ret = qup_i2c_req_dma(qup);
+
+ if (ret) {
+ if (ret == -EPROBE_DEFER)
+ return ret;
+ else
+ goto nodma;
+ }
+
+ blocks = (MX_BLOCKS << 1) + 1;
+ qup->btx.sg = devm_kzalloc(&pdev->dev,
+ sizeof(*qup->btx.sg) * blocks,
+ GFP_KERNEL);
+ if (!qup->btx.sg) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ sg_init_table(qup->btx.sg, blocks);
+
+ qup->brx.sg = devm_kzalloc(&pdev->dev,
+ sizeof(*qup->brx.sg) * blocks,
+ GFP_KERNEL);
+ if (!qup->brx.sg) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ sg_init_table(qup->brx.sg, blocks);
+
+ /* 2 tag bytes for each block + 5 for start, stop tags */
+ size = blocks * 2 + 5;
+ qup->dpool = dma_pool_create("qup_i2c-dma-pool", &pdev->dev,
+ size, 4, 0);
+
+ qup->start_tag.start = dma_pool_alloc(qup->dpool, GFP_KERNEL,
+ &qup->start_tag.addr);
+ if (!qup->start_tag.start) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ qup->brx.tag.start = dma_pool_alloc(qup->dpool,
+ GFP_KERNEL,
+ &qup->brx.tag.addr);
+ if (!qup->brx.tag.start) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+
+ qup->btx.tag.start = dma_pool_alloc(qup->dpool,
+ GFP_KERNEL,
+ &qup->btx.tag.addr);
+ if (!qup->btx.tag.start) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ qup->is_dma = 1;
}
+nodma:
/* We support frequencies up to FAST Mode (400KHz) */
if (!clk_freq || clk_freq > 400000) {
dev_err(qup->dev, "clock frequency not supported %d\n",
@@ -1092,6 +1506,11 @@ fail_runtime:
pm_runtime_disable(qup->dev);
pm_runtime_set_suspended(qup->dev);
fail:
+ if (qup->btx.dma)
+ dma_release_channel(qup->btx.dma);
+ if (qup->brx.dma)
+ dma_release_channel(qup->brx.dma);
+
qup_i2c_disable_clocks(qup);
return ret;
}
@@ -1100,6 +1519,18 @@ static int qup_i2c_remove(struct platform_device *pdev)
{
struct qup_i2c_dev *qup = platform_get_drvdata(pdev);
+ if (qup->is_dma) {
+ dma_pool_free(qup->dpool, qup->start_tag.start,
+ qup->start_tag.addr);
+ dma_pool_free(qup->dpool, qup->brx.tag.start,
+ qup->brx.tag.addr);
+ dma_pool_free(qup->dpool, qup->btx.tag.start,
+ qup->btx.tag.addr);
+ dma_pool_destroy(qup->dpool);
+ dma_release_channel(qup->btx.dma);
+ dma_release_channel(qup->brx.dma);
+ }
+
disable_irq(qup->irq);
qup_i2c_disable_clocks(qup);
i2c_del_adapter(&qup->adap);
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
^ permalink raw reply related [flat|nested] 12+ messages in thread* [V5,4/6] i2c: qup: Add bam dma capabilities
2015-11-17 11:45 ` [PATCH V5 4/6] i2c: qup: Add bam dma capabilities Sricharan R
@ 2016-01-09 4:38 ` Andy Gross
0 siblings, 0 replies; 12+ messages in thread
From: Andy Gross @ 2016-01-09 4:38 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, Nov 17, 2015 at 05:15:25PM +0530, Sricharan R wrote:
> QUP cores can be attached to a BAM module, which acts as a dma engine for the
> QUP core. When DMA with BAM is enabled, the BAM consumer pipe transmitted data
> is written to the output FIFO and the BAM producer pipe received data is read
> from the input FIFO.
>
> With BAM capabilities, qup-i2c core can transfer more than 256 bytes, without a
> 'stop' which is not possible otherwise.
>
> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
> ---
Reviewed-by: Andy Gross <andy.gross@linaro.org>
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH V5 5/6] dts: msm8974: Add blsp2_bam dma node
2015-11-17 11:45 [PATCH V5 0/6] i2c: qup: Add support for v2 tags and bam dma Sricharan R
` (3 preceding siblings ...)
2015-11-17 11:45 ` [PATCH V5 4/6] i2c: qup: Add bam dma capabilities Sricharan R
@ 2015-11-17 11:45 ` Sricharan R
2016-01-09 4:39 ` [V5,5/6] " Andy Gross
2015-11-17 11:45 ` [PATCH V5 6/6] dts: msm8974: Add dma channels for blsp2_i2c1 node Sricharan R
5 siblings, 1 reply; 12+ messages in thread
From: Sricharan R @ 2015-11-17 11:45 UTC (permalink / raw)
To: linux-arm-kernel
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
---
arch/arm/boot/dts/qcom-msm8974.dtsi | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/qcom-msm8974.dtsi b/arch/arm/boot/dts/qcom-msm8974.dtsi
index 753bdfd..7786408 100644
--- a/arch/arm/boot/dts/qcom-msm8974.dtsi
+++ b/arch/arm/boot/dts/qcom-msm8974.dtsi
@@ -1,6 +1,6 @@
/dts-v1/;
-#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/interrupt-controller/arm-gic.h>
#include <dt-bindings/clock/qcom,gcc-msm8974.h>
#include "skeleton.dtsi"
@@ -345,6 +345,16 @@
interrupt-controller;
#interrupt-cells = <4>;
};
+
+ blsp2_dma: dma-controller at f9944000 {
+ compatible = "qcom,bam-v1.4.0";
+ reg = <0xf9944000 0x19000>;
+ interrupts = <GIC_SPI 239 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&gcc GCC_BLSP2_AHB_CLK>;
+ clock-names = "bam_clk";
+ #dma-cells = <1>;
+ qcom,ee = <0>;
+ };
};
smd {
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
^ permalink raw reply related [flat|nested] 12+ messages in thread* [PATCH V5 6/6] dts: msm8974: Add dma channels for blsp2_i2c1 node
2015-11-17 11:45 [PATCH V5 0/6] i2c: qup: Add support for v2 tags and bam dma Sricharan R
` (4 preceding siblings ...)
2015-11-17 11:45 ` [PATCH V5 5/6] dts: msm8974: Add blsp2_bam dma node Sricharan R
@ 2015-11-17 11:45 ` Sricharan R
2016-01-09 4:40 ` [V5,6/6] " Andy Gross
5 siblings, 1 reply; 12+ messages in thread
From: Sricharan R @ 2015-11-17 11:45 UTC (permalink / raw)
To: linux-arm-kernel
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
---
arch/arm/boot/dts/qcom-msm8974.dtsi | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/boot/dts/qcom-msm8974.dtsi b/arch/arm/boot/dts/qcom-msm8974.dtsi
index 7786408..bd1be53 100644
--- a/arch/arm/boot/dts/qcom-msm8974.dtsi
+++ b/arch/arm/boot/dts/qcom-msm8974.dtsi
@@ -328,6 +328,8 @@
clock-names = "core", "iface";
#address-cells = <1>;
#size-cells = <0>;
+ dmas = <&blsp2_dma 20>, <&blsp2_dma 21>;
+ dma-names = "tx", "rx";
};
spmi_bus: spmi at fc4cf000 {
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
^ permalink raw reply related [flat|nested] 12+ messages in thread