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Diffstat (limited to 'target/linux/ipq40xx/patches-4.14/088-0013-i2c-qup-reorganization-of-driver-code-to-remove-poll.patch')
-rw-r--r--target/linux/ipq40xx/patches-4.14/088-0013-i2c-qup-reorganization-of-driver-code-to-remove-poll.patch1154
1 files changed, 0 insertions, 1154 deletions
diff --git a/target/linux/ipq40xx/patches-4.14/088-0013-i2c-qup-reorganization-of-driver-code-to-remove-poll.patch b/target/linux/ipq40xx/patches-4.14/088-0013-i2c-qup-reorganization-of-driver-code-to-remove-poll.patch
deleted file mode 100644
index 6d32882117..0000000000
--- a/target/linux/ipq40xx/patches-4.14/088-0013-i2c-qup-reorganization-of-driver-code-to-remove-poll.patch
+++ /dev/null
@@ -1,1154 +0,0 @@
-From 7545c7dba169c4c29ba5f6ab8706267a84c0febe Mon Sep 17 00:00:00 2001
-From: Abhishek Sahu <absahu@codeaurora.org>
-Date: Mon, 12 Mar 2018 18:45:02 +0530
-Subject: [PATCH 13/13] i2c: qup: reorganization of driver code to remove
- polling for qup v2
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-Following are the major issues in current driver code
-
-1. The current driver simply assumes the transfer completion
- whenever its gets any non-error interrupts and then simply do the
- polling of available/free bytes in FIFO.
-2. The block mode is not working properly since no handling in
- being done for OUT_BLOCK_WRITE_REQ and IN_BLOCK_READ_READ.
-3. An i2c transfer can contain multiple message and QUP v2
- supports reconfiguration during run in which the mode should be same
- for all the sub transfer. Currently the mode is being programmed
- before every sub transfer which is functionally wrong. If one message
- is less than FIFO length and other message is greater than FIFO
- length, then transfers will fail.
-
-Because of above, i2c v2 transfers of size greater than 64 are failing
-with following error message
-
- i2c_qup 78b6000.i2c: timeout for fifo out full
-
-To make block mode working properly and move to use the interrupts
-instead of polling, major code reorganization is required. Following
-are the major changes done in this patch
-
-1. Remove the polling of TX FIFO free space and RX FIFO available
- bytes and move to interrupts completely. QUP has QUP_MX_OUTPUT_DONE,
- QUP_MX_INPUT_DONE, OUT_BLOCK_WRITE_REQ and IN_BLOCK_READ_REQ
- interrupts to handle FIFO’s properly so check all these interrupts.
-2. Determine the mode for transfer before starting by checking
- all the tx/rx data length in each message. The complete message can be
- transferred either in DMA mode or Programmed IO by FIFO/Block mode.
- in DMA mode, both tx and rx uses same mode but in PIO mode, the TX and
- RX can be in different mode.
-3. During write, For FIFO mode, TX FIFO can be directly written
- without checking for FIFO space. For block mode, the QUP will generate
- OUT_BLOCK_WRITE_REQ interrupt whenever it has block size of available
- space.
-4. During read, both TX and RX FIFO will be used. TX will be used
- for writing tags and RX will be used for receiving the data. In QUP,
- TX and RX can operate in separate mode so configure modes accordingly.
-5. For read FIFO mode, wait for QUP_MX_INPUT_DONE interrupt which
- will be generated after all the bytes have been copied in RX FIFO. For
- read Block mode, QUP will generate IN_BLOCK_READ_REQ interrupts
- whenever it has block size of available data.
-6. Split the transfer in chunk of one QUP block size(256 bytes)
- and schedule each block separately. QUP v2 supports reconfiguration
- during run in which QUP can transfer multiple blocks without issuing a
- stop events.
-7. Port the SMBus block read support for new code changes.
-
-Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
-Reviewed-by: Sricharan R <sricharan@codeaurora.org>
-Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
----
- drivers/i2c/busses/i2c-qup.c | 900 ++++++++++++++++++++---------------
- 1 file changed, 515 insertions(+), 385 deletions(-)
-
---- a/drivers/i2c/busses/i2c-qup.c
-+++ b/drivers/i2c/busses/i2c-qup.c
-@@ -141,17 +141,40 @@
- #define DEFAULT_SRC_CLK 20000000
-
- /*
-+ * Max tags length (start, stop and maximum 2 bytes address) for each QUP
-+ * data transfer
-+ */
-+#define QUP_MAX_TAGS_LEN 4
-+/* Max data length for each DATARD tags */
-+#define RECV_MAX_DATA_LEN 254
-+/* TAG length for DATA READ in RX FIFO */
-+#define READ_RX_TAGS_LEN 2
-+
-+/*
- * count: no of blocks
- * pos: current block number
- * tx_tag_len: tx tag length for current block
- * rx_tag_len: rx tag length for current block
- * data_len: remaining data length for current message
-+ * cur_blk_len: data length for current block
- * total_tx_len: total tx length including tag bytes for current QUP transfer
- * total_rx_len: total rx length including tag bytes for current QUP transfer
-+ * tx_fifo_data_pos: current byte number in TX FIFO word
- * tx_fifo_free: number of free bytes in current QUP block write.
-+ * rx_fifo_data_pos: current byte number in RX FIFO word
- * fifo_available: number of available bytes in RX FIFO for current
- * QUP block read
-+ * tx_fifo_data: QUP TX FIFO write works on word basis (4 bytes). New byte write
-+ * to TX FIFO will be appended in this data and will be written to
-+ * TX FIFO when all the 4 bytes are available.
-+ * rx_fifo_data: QUP RX FIFO read works on word basis (4 bytes). This will
-+ * contains the 4 bytes of RX data.
-+ * cur_data: pointer to tell cur data position for current message
-+ * cur_tx_tags: pointer to tell cur position in tags
-+ * tx_tags_sent: all tx tag bytes have been written in FIFO word
-+ * send_last_word: for tx FIFO, last word send is pending in current block
- * rx_bytes_read: if all the bytes have been read from rx FIFO.
-+ * rx_tags_fetched: all the rx tag bytes have been fetched from rx fifo word
- * is_tx_blk_mode: whether tx uses block or FIFO mode in case of non BAM xfer.
- * is_rx_blk_mode: whether rx uses block or FIFO mode in case of non BAM xfer.
- * tags: contains tx tag bytes for current QUP transfer
-@@ -162,10 +185,20 @@ struct qup_i2c_block {
- int tx_tag_len;
- int rx_tag_len;
- int data_len;
-+ int cur_blk_len;
- int total_tx_len;
- int total_rx_len;
-+ int tx_fifo_data_pos;
- int tx_fifo_free;
-+ int rx_fifo_data_pos;
- int fifo_available;
-+ u32 tx_fifo_data;
-+ u32 rx_fifo_data;
-+ u8 *cur_data;
-+ u8 *cur_tx_tags;
-+ bool tx_tags_sent;
-+ bool send_last_word;
-+ bool rx_tags_fetched;
- bool rx_bytes_read;
- bool is_tx_blk_mode;
- bool is_rx_blk_mode;
-@@ -198,6 +231,7 @@ struct qup_i2c_dev {
- int out_blk_sz;
- int in_blk_sz;
-
-+ int blk_xfer_limit;
- unsigned long one_byte_t;
- unsigned long xfer_timeout;
- struct qup_i2c_block blk;
-@@ -212,10 +246,10 @@ struct qup_i2c_dev {
-
- /* To check if this is the last msg */
- bool is_last;
-- bool is_qup_v1;
-+ bool is_smbus_read;
-
- /* To configure when bus is in run state */
-- int config_run;
-+ u32 config_run;
-
- /* dma parameters */
- bool is_dma;
-@@ -223,6 +257,8 @@ struct qup_i2c_dev {
- bool use_dma;
- unsigned int max_xfer_sg_len;
- unsigned int tag_buf_pos;
-+ /* The threshold length above which block mode will be used */
-+ unsigned int blk_mode_threshold;
- struct dma_pool *dpool;
- struct qup_i2c_tag start_tag;
- struct qup_i2c_bam brx;
-@@ -287,9 +323,6 @@ static irqreturn_t qup_i2c_interrupt(int
- goto done;
- }
-
-- if (!qup->is_qup_v1)
-- goto done;
--
- if (opflags & QUP_OUT_SVC_FLAG) {
- writel(QUP_OUT_SVC_FLAG, qup->base + QUP_OPERATIONAL);
-
-@@ -416,108 +449,6 @@ static int qup_i2c_bus_active(struct qup
- return ret;
- }
-
--/**
-- * 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);
-- int ret = 0;
--
-- 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 & op) >> shift) == val) {
-- if ((op == QUP_OUT_NOT_EMPTY) && qup->is_last) {
-- if (!(status & I2C_STATUS_BUS_ACTIVE)) {
-- ret = 0;
-- goto done;
-- }
-- } else {
-- ret = 0;
-- goto done;
-- }
-- }
--
-- if (time_after(jiffies, timeout)) {
-- ret = -ETIMEDOUT;
-- goto done;
-- }
-- usleep_range(len, len * 2);
-- }
--
--done:
-- if (qup->bus_err || qup->qup_err)
-- ret = (qup->bus_err & QUP_I2C_NACK_FLAG) ? -ENXIO : -EIO;
--
-- return ret;
--}
--
--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;
--
-- total |= qup->config_run;
--
-- 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 int check_for_fifo_space(struct qup_i2c_dev *qup)
--{
-- int ret;
--
-- ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
-- if (ret)
-- goto out;
--
-- ret = qup_i2c_wait_ready(qup, QUP_OUT_FULL,
-- RESET_BIT, 4 * ONE_BYTE);
-- if (ret) {
-- /* Fifo is full. Drain out the fifo */
-- ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
-- if (ret)
-- goto out;
--
-- ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY,
-- RESET_BIT, 256 * ONE_BYTE);
-- if (ret) {
-- dev_err(qup->dev, "timeout for fifo out full");
-- goto out;
-- }
--
-- ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
-- if (ret)
-- goto out;
-- }
--
--out:
-- return ret;
--}
--
- static void qup_i2c_write_tx_fifo_v1(struct qup_i2c_dev *qup)
- {
- struct qup_i2c_block *blk = &qup->blk;
-@@ -560,60 +491,17 @@ static void qup_i2c_write_tx_fifo_v1(str
- 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.pos = 0;
- 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 = check_for_fifo_space(qup);
-- if (ret)
-- 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;
-- }
--
-- ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
--
-- return ret;
-+ qup->blk.count = DIV_ROUND_UP(msg->len, qup->blk_xfer_limit);
- }
-
- 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;
-+ if (qup->blk.data_len > qup->blk_xfer_limit)
-+ data_len = qup->blk_xfer_limit;
- else
- data_len = qup->blk.data_len;
-
-@@ -630,9 +518,9 @@ static int qup_i2c_set_tags_smb(u16 addr
- {
- int len = 0;
-
-- if (msg->len > 1) {
-+ if (qup->is_smbus_read) {
- tags[len++] = QUP_TAG_V2_DATARD_STOP;
-- tags[len++] = qup_i2c_get_data_len(qup) - 1;
-+ tags[len++] = qup_i2c_get_data_len(qup);
- } else {
- tags[len++] = QUP_TAG_V2_START;
- tags[len++] = addr & 0xff;
-@@ -694,24 +582,6 @@ static int qup_i2c_set_tags(u8 *tags, st
- 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 void qup_i2c_bam_cb(void *data)
- {
-@@ -778,6 +648,7 @@ static int qup_i2c_bam_make_desc(struct
- u32 i = 0, tlen, tx_len = 0;
- u8 *tags;
-
-+ qup->blk_xfer_limit = QUP_READ_LIMIT;
- qup_i2c_set_blk_data(qup, msg);
-
- blocks = qup->blk.count;
-@@ -1026,7 +897,7 @@ static int qup_i2c_wait_for_complete(str
- unsigned long left;
- int ret = 0;
-
-- left = wait_for_completion_timeout(&qup->xfer, HZ);
-+ left = wait_for_completion_timeout(&qup->xfer, qup->xfer_timeout);
- if (!left) {
- writel(1, qup->base + QUP_SW_RESET);
- ret = -ETIMEDOUT;
-@@ -1038,65 +909,6 @@ static int qup_i2c_wait_for_complete(str
- 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 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(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(tx_len, qup->base + QUP_MX_OUTPUT_CNT);
-- writel(len, qup->base + QUP_MX_INPUT_CNT);
-- }
--}
--
- static void qup_i2c_read_rx_fifo_v1(struct qup_i2c_dev *qup)
- {
- struct qup_i2c_block *blk = &qup->blk;
-@@ -1120,104 +932,6 @@ static void qup_i2c_read_rx_fifo_v1(stru
- blk->rx_bytes_read = true;
- }
-
--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, msg_offset = 0;
--
-- /*
-- * If the message length is already read in
-- * the first byte of the buffer, account for
-- * that by setting the offset
-- */
-- if (qup_i2c_check_msg_len(msg) && (msg->len > 1))
-- msg_offset = 1;
-- total = qup_i2c_get_data_len(qup);
-- total -= msg_offset;
--
-- /* 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 + msg_offset] = val & 0xff;
-- qup->pos++;
-- }
-- }
--
--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++;
--
-- /* Handle SMBus block read length */
-- if (qup_i2c_check_msg_len(msg) && (msg->len == 1)) {
-- if (msg->buf[0] > I2C_SMBUS_BLOCK_MAX) {
-- ret = -EPROTO;
-- goto err;
-- }
-- msg->len += msg->buf[0];
-- qup->pos = 0;
-- qup_i2c_set_blk_data(qup, msg);
-- /* set tag length for block read */
-- qup->blk.tx_tag_len = 2;
-- qup_i2c_set_read_mode_v2(qup, msg->buf[0]);
-- }
-- } while (qup->blk.pos < qup->blk.count);
--
--err:
-- disable_irq(qup->irq);
-- qup->msg = NULL;
--
-- return ret;
--}
--
- static void qup_i2c_write_rx_tags_v1(struct qup_i2c_dev *qup)
- {
- struct i2c_msg *msg = qup->msg;
-@@ -1404,13 +1118,434 @@ out:
- return ret;
- }
-
-+/*
-+ * Configure registers related with reconfiguration during run and call it
-+ * before each i2c sub transfer.
-+ */
-+static void qup_i2c_conf_count_v2(struct qup_i2c_dev *qup)
-+{
-+ struct qup_i2c_block *blk = &qup->blk;
-+ u32 qup_config = I2C_MINI_CORE | I2C_N_VAL_V2;
-+
-+ if (blk->is_tx_blk_mode)
-+ writel(qup->config_run | blk->total_tx_len,
-+ qup->base + QUP_MX_OUTPUT_CNT);
-+ else
-+ writel(qup->config_run | blk->total_tx_len,
-+ qup->base + QUP_MX_WRITE_CNT);
-+
-+ if (blk->total_rx_len) {
-+ if (blk->is_rx_blk_mode)
-+ writel(qup->config_run | blk->total_rx_len,
-+ qup->base + QUP_MX_INPUT_CNT);
-+ else
-+ writel(qup->config_run | blk->total_rx_len,
-+ qup->base + QUP_MX_READ_CNT);
-+ } else {
-+ qup_config |= QUP_NO_INPUT;
-+ }
-+
-+ writel(qup_config, qup->base + QUP_CONFIG);
-+}
-+
-+/*
-+ * Configure registers related with transfer mode (FIFO/Block)
-+ * before starting of i2c transfer. It will be called only once in
-+ * QUP RESET state.
-+ */
-+static void qup_i2c_conf_mode_v2(struct qup_i2c_dev *qup)
-+{
-+ struct qup_i2c_block *blk = &qup->blk;
-+ u32 io_mode = QUP_REPACK_EN;
-+
-+ if (blk->is_tx_blk_mode) {
-+ io_mode |= QUP_OUTPUT_BLK_MODE;
-+ writel(0, qup->base + QUP_MX_WRITE_CNT);
-+ } else {
-+ writel(0, qup->base + QUP_MX_OUTPUT_CNT);
-+ }
-+
-+ if (blk->is_rx_blk_mode) {
-+ io_mode |= QUP_INPUT_BLK_MODE;
-+ writel(0, qup->base + QUP_MX_READ_CNT);
-+ } else {
-+ writel(0, qup->base + QUP_MX_INPUT_CNT);
-+ }
-+
-+ writel(io_mode, qup->base + QUP_IO_MODE);
-+}
-+
-+/* Clear required variables before starting of any QUP v2 sub transfer. */
-+static void qup_i2c_clear_blk_v2(struct qup_i2c_block *blk)
-+{
-+ blk->send_last_word = false;
-+ blk->tx_tags_sent = false;
-+ blk->tx_fifo_data = 0;
-+ blk->tx_fifo_data_pos = 0;
-+ blk->tx_fifo_free = 0;
-+
-+ blk->rx_tags_fetched = false;
-+ blk->rx_bytes_read = false;
-+ blk->rx_fifo_data = 0;
-+ blk->rx_fifo_data_pos = 0;
-+ blk->fifo_available = 0;
-+}
-+
-+/* Receive data from RX FIFO for read message in QUP v2 i2c transfer. */
-+static void qup_i2c_recv_data(struct qup_i2c_dev *qup)
-+{
-+ struct qup_i2c_block *blk = &qup->blk;
-+ int j;
-+
-+ for (j = blk->rx_fifo_data_pos;
-+ blk->cur_blk_len && blk->fifo_available;
-+ blk->cur_blk_len--, blk->fifo_available--) {
-+ if (j == 0)
-+ blk->rx_fifo_data = readl(qup->base + QUP_IN_FIFO_BASE);
-+
-+ *(blk->cur_data++) = blk->rx_fifo_data;
-+ blk->rx_fifo_data >>= 8;
-+
-+ if (j == 3)
-+ j = 0;
-+ else
-+ j++;
-+ }
-+
-+ blk->rx_fifo_data_pos = j;
-+}
-+
-+/* Receive tags for read message in QUP v2 i2c transfer. */
-+static void qup_i2c_recv_tags(struct qup_i2c_dev *qup)
-+{
-+ struct qup_i2c_block *blk = &qup->blk;
-+
-+ blk->rx_fifo_data = readl(qup->base + QUP_IN_FIFO_BASE);
-+ blk->rx_fifo_data >>= blk->rx_tag_len * 8;
-+ blk->rx_fifo_data_pos = blk->rx_tag_len;
-+ blk->fifo_available -= blk->rx_tag_len;
-+}
-+
-+/*
-+ * Read the data and tags from RX FIFO. Since in read case, the tags will be
-+ * preceded by received data bytes so
-+ * 1. Check if rx_tags_fetched is false i.e. the start of QUP block so receive
-+ * all tag bytes and discard that.
-+ * 2. Read the data from RX FIFO. When all the data bytes have been read then
-+ * set rx_bytes_read to true.
-+ */
-+static void qup_i2c_read_rx_fifo_v2(struct qup_i2c_dev *qup)
-+{
-+ struct qup_i2c_block *blk = &qup->blk;
-+
-+ if (!blk->rx_tags_fetched) {
-+ qup_i2c_recv_tags(qup);
-+ blk->rx_tags_fetched = true;
-+ }
-+
-+ qup_i2c_recv_data(qup);
-+ if (!blk->cur_blk_len)
-+ blk->rx_bytes_read = true;
-+}
-+
-+/*
-+ * Write bytes in TX FIFO for write message in QUP v2 i2c transfer. QUP TX FIFO
-+ * write works on word basis (4 bytes). Append new data byte write for TX FIFO
-+ * in tx_fifo_data and write to TX FIFO when all the 4 bytes are present.
-+ */
-+static void
-+qup_i2c_write_blk_data(struct qup_i2c_dev *qup, u8 **data, unsigned int *len)
-+{
-+ struct qup_i2c_block *blk = &qup->blk;
-+ unsigned int j;
-+
-+ for (j = blk->tx_fifo_data_pos; *len && blk->tx_fifo_free;
-+ (*len)--, blk->tx_fifo_free--) {
-+ blk->tx_fifo_data |= *(*data)++ << (j * 8);
-+ if (j == 3) {
-+ writel(blk->tx_fifo_data,
-+ qup->base + QUP_OUT_FIFO_BASE);
-+ blk->tx_fifo_data = 0x0;
-+ j = 0;
-+ } else {
-+ j++;
-+ }
-+ }
-+
-+ blk->tx_fifo_data_pos = j;
-+}
-+
-+/* Transfer tags for read message in QUP v2 i2c transfer. */
-+static void qup_i2c_write_rx_tags_v2(struct qup_i2c_dev *qup)
-+{
-+ struct qup_i2c_block *blk = &qup->blk;
-+
-+ qup_i2c_write_blk_data(qup, &blk->cur_tx_tags, &blk->tx_tag_len);
-+ if (blk->tx_fifo_data_pos)
-+ writel(blk->tx_fifo_data, qup->base + QUP_OUT_FIFO_BASE);
-+}
-+
-+/*
-+ * Write the data and tags in TX FIFO. Since in write case, both tags and data
-+ * need to be written and QUP write tags can have maximum 256 data length, so
-+ *
-+ * 1. Check if tx_tags_sent is false i.e. the start of QUP block so write the
-+ * tags to TX FIFO and set tx_tags_sent to true.
-+ * 2. Check if send_last_word is true. It will be set when last few data bytes
-+ * (less than 4 bytes) are reamining to be written in FIFO because of no FIFO
-+ * space. All this data bytes are available in tx_fifo_data so write this
-+ * in FIFO.
-+ * 3. Write the data to TX FIFO and check for cur_blk_len. If it is non zero
-+ * then more data is pending otherwise following 3 cases can be possible
-+ * a. if tx_fifo_data_pos is zero i.e. all the data bytes in this block
-+ * have been written in TX FIFO so nothing else is required.
-+ * b. tx_fifo_free is non zero i.e tx FIFO is free so copy the remaining data
-+ * from tx_fifo_data to tx FIFO. Since, qup_i2c_write_blk_data do write
-+ * in 4 bytes and FIFO space is in multiple of 4 bytes so tx_fifo_free
-+ * will be always greater than or equal to 4 bytes.
-+ * c. tx_fifo_free is zero. In this case, last few bytes (less than 4
-+ * bytes) are copied to tx_fifo_data but couldn't be sent because of
-+ * FIFO full so make send_last_word true.
-+ */
-+static void qup_i2c_write_tx_fifo_v2(struct qup_i2c_dev *qup)
-+{
-+ struct qup_i2c_block *blk = &qup->blk;
-+
-+ if (!blk->tx_tags_sent) {
-+ qup_i2c_write_blk_data(qup, &blk->cur_tx_tags,
-+ &blk->tx_tag_len);
-+ blk->tx_tags_sent = true;
-+ }
-+
-+ if (blk->send_last_word)
-+ goto send_last_word;
-+
-+ qup_i2c_write_blk_data(qup, &blk->cur_data, &blk->cur_blk_len);
-+ if (!blk->cur_blk_len) {
-+ if (!blk->tx_fifo_data_pos)
-+ return;
-+
-+ if (blk->tx_fifo_free)
-+ goto send_last_word;
-+
-+ blk->send_last_word = true;
-+ }
-+
-+ return;
-+
-+send_last_word:
-+ writel(blk->tx_fifo_data, qup->base + QUP_OUT_FIFO_BASE);
-+}
-+
-+/*
-+ * Main transfer function which read or write i2c data.
-+ * The QUP v2 supports reconfiguration during run in which multiple i2c sub
-+ * transfers can be scheduled.
-+ */
-+static int
-+qup_i2c_conf_xfer_v2(struct qup_i2c_dev *qup, bool is_rx, bool is_first,
-+ bool change_pause_state)
-+{
-+ struct qup_i2c_block *blk = &qup->blk;
-+ struct i2c_msg *msg = qup->msg;
-+ int ret;
-+
-+ /*
-+ * Check if its SMBus Block read for which the top level read will be
-+ * done into 2 QUP reads. One with message length 1 while other one is
-+ * with actual length.
-+ */
-+ if (qup_i2c_check_msg_len(msg)) {
-+ if (qup->is_smbus_read) {
-+ /*
-+ * If the message length is already read in
-+ * the first byte of the buffer, account for
-+ * that by setting the offset
-+ */
-+ blk->cur_data += 1;
-+ is_first = false;
-+ } else {
-+ change_pause_state = false;
-+ }
-+ }
-+
-+ qup->config_run = is_first ? 0 : QUP_I2C_MX_CONFIG_DURING_RUN;
-+
-+ qup_i2c_clear_blk_v2(blk);
-+ qup_i2c_conf_count_v2(qup);
-+
-+ /* If it is first sub transfer, then configure i2c bus clocks */
-+ if (is_first) {
-+ ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
-+ if (ret)
-+ return ret;
-+
-+ writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL);
-+
-+ ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
-+ if (ret)
-+ return ret;
-+ }
-+
-+ reinit_completion(&qup->xfer);
-+ enable_irq(qup->irq);
-+ /*
-+ * In FIFO mode, tx FIFO can be written directly while in block mode the
-+ * it will be written after getting OUT_BLOCK_WRITE_REQ interrupt
-+ */
-+ if (!blk->is_tx_blk_mode) {
-+ blk->tx_fifo_free = qup->out_fifo_sz;
-+
-+ if (is_rx)
-+ qup_i2c_write_rx_tags_v2(qup);
-+ else
-+ qup_i2c_write_tx_fifo_v2(qup);
-+ }
-+
-+ ret = qup_i2c_change_state(qup, QUP_RUN_STATE);
-+ if (ret)
-+ goto err;
-+
-+ ret = qup_i2c_wait_for_complete(qup, msg);
-+ if (ret)
-+ goto err;
-+
-+ /* Move to pause state for all the transfers, except last one */
-+ if (change_pause_state) {
-+ ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE);
-+ if (ret)
-+ goto err;
-+ }
-+
-+err:
-+ disable_irq(qup->irq);
-+ return ret;
-+}
-+
-+/*
-+ * Transfer one read/write message in i2c transfer. It splits the message into
-+ * multiple of blk_xfer_limit data length blocks and schedule each
-+ * QUP block individually.
-+ */
-+static int qup_i2c_xfer_v2_msg(struct qup_i2c_dev *qup, int msg_id, bool is_rx)
-+{
-+ int ret = 0;
-+ unsigned int data_len, i;
-+ struct i2c_msg *msg = qup->msg;
-+ struct qup_i2c_block *blk = &qup->blk;
-+ u8 *msg_buf = msg->buf;
-+
-+ qup->blk_xfer_limit = is_rx ? RECV_MAX_DATA_LEN : QUP_READ_LIMIT;
-+ qup_i2c_set_blk_data(qup, msg);
-+
-+ for (i = 0; i < blk->count; i++) {
-+ data_len = qup_i2c_get_data_len(qup);
-+ blk->pos = i;
-+ blk->cur_tx_tags = blk->tags;
-+ blk->cur_blk_len = data_len;
-+ blk->tx_tag_len =
-+ qup_i2c_set_tags(blk->cur_tx_tags, qup, qup->msg);
-+
-+ blk->cur_data = msg_buf;
-+
-+ if (is_rx) {
-+ blk->total_tx_len = blk->tx_tag_len;
-+ blk->rx_tag_len = 2;
-+ blk->total_rx_len = blk->rx_tag_len + data_len;
-+ } else {
-+ blk->total_tx_len = blk->tx_tag_len + data_len;
-+ blk->total_rx_len = 0;
-+ }
-+
-+ ret = qup_i2c_conf_xfer_v2(qup, is_rx, !msg_id && !i,
-+ !qup->is_last || i < blk->count - 1);
-+ if (ret)
-+ return ret;
-+
-+ /* Handle SMBus block read length */
-+ if (qup_i2c_check_msg_len(msg) && msg->len == 1 &&
-+ !qup->is_smbus_read) {
-+ if (msg->buf[0] > I2C_SMBUS_BLOCK_MAX)
-+ return -EPROTO;
-+
-+ msg->len = msg->buf[0];
-+ qup->is_smbus_read = true;
-+ ret = qup_i2c_xfer_v2_msg(qup, msg_id, true);
-+ qup->is_smbus_read = false;
-+ if (ret)
-+ return ret;
-+
-+ msg->len += 1;
-+ }
-+
-+ msg_buf += data_len;
-+ blk->data_len -= qup->blk_xfer_limit;
-+ }
-+
-+ return ret;
-+}
-+
-+/*
-+ * QUP v2 supports 3 modes
-+ * Programmed IO using FIFO mode : Less than FIFO size
-+ * Programmed IO using Block mode : Greater than FIFO size
-+ * DMA using BAM : Appropriate for any transaction size but the address should
-+ * be DMA applicable
-+ *
-+ * This function determines the mode which will be used for this transfer. An
-+ * i2c transfer contains multiple message. Following are the rules to determine
-+ * the mode used.
-+ * 1. Determine complete length, maximum tx and rx length for complete transfer.
-+ * 2. If complete transfer length is greater than fifo size then use the DMA
-+ * mode.
-+ * 3. In FIFO or block mode, tx and rx can operate in different mode so check
-+ * for maximum tx and rx length to determine mode.
-+ */
-+static int
-+qup_i2c_determine_mode_v2(struct qup_i2c_dev *qup,
-+ struct i2c_msg msgs[], int num)
-+{
-+ int idx;
-+ bool no_dma = false;
-+ unsigned int max_tx_len = 0, max_rx_len = 0, total_len = 0;
-+
-+ /* All i2c_msgs should be transferred using either dma or cpu */
-+ for (idx = 0; idx < num; idx++) {
-+ if (msgs[idx].len == 0)
-+ return -EINVAL;
-+
-+ if (msgs[idx].flags & I2C_M_RD)
-+ max_rx_len = max_t(unsigned int, max_rx_len,
-+ msgs[idx].len);
-+ else
-+ max_tx_len = max_t(unsigned int, max_tx_len,
-+ msgs[idx].len);
-+
-+ if (is_vmalloc_addr(msgs[idx].buf))
-+ no_dma = true;
-+
-+ total_len += msgs[idx].len;
-+ }
-+
-+ if (!no_dma && qup->is_dma &&
-+ (total_len > qup->out_fifo_sz || total_len > qup->in_fifo_sz)) {
-+ qup->use_dma = true;
-+ } else {
-+ qup->blk.is_tx_blk_mode = max_tx_len > qup->out_fifo_sz -
-+ QUP_MAX_TAGS_LEN ? true : false;
-+ qup->blk.is_rx_blk_mode = max_rx_len > qup->in_fifo_sz -
-+ READ_RX_TAGS_LEN ? true : false;
-+ }
-+
-+ return 0;
-+}
-+
- 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 = 0;
-- unsigned int total_len = 0;
-
- qup->bus_err = 0;
- qup->qup_err = 0;
-@@ -1419,6 +1554,10 @@ static int qup_i2c_xfer_v2(struct i2c_ad
- if (ret < 0)
- goto out;
-
-+ ret = qup_i2c_determine_mode_v2(qup, msgs, num);
-+ if (ret)
-+ goto out;
-+
- writel(1, qup->base + QUP_SW_RESET);
- ret = qup_i2c_poll_state(qup, QUP_RESET_STATE);
- if (ret)
-@@ -1428,60 +1567,35 @@ static int qup_i2c_xfer_v2(struct i2c_ad
- 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;
-- }
--
-- if (is_vmalloc_addr(msgs[idx].buf))
-- break;
--
-- total_len += msgs[idx].len;
-- }
--
-- if (idx == num && (total_len > qup->out_fifo_sz ||
-- total_len > qup->in_fifo_sz))
-- qup->use_dma = true;
-+ if (qup_i2c_poll_state_i2c_master(qup)) {
-+ ret = -EIO;
-+ goto out;
- }
-
-- idx = 0;
-+ if (qup->use_dma) {
-+ reinit_completion(&qup->xfer);
-+ ret = qup_i2c_bam_xfer(adap, &msgs[0], num);
-+ qup->use_dma = false;
-+ } else {
-+ qup_i2c_conf_mode_v2(qup);
-
-- do {
-- if (msgs[idx].len == 0) {
-- ret = -EINVAL;
-- goto out;
-- }
-+ for (idx = 0; idx < num; idx++) {
-+ qup->msg = &msgs[idx];
-+ qup->is_last = idx == (num - 1);
-
-- if (qup_i2c_poll_state_i2c_master(qup)) {
-- ret = -EIO;
-- goto out;
-+ ret = qup_i2c_xfer_v2_msg(qup, idx,
-+ !!(msgs[idx].flags & I2C_M_RD));
-+ if (ret)
-+ break;
- }
-+ qup->msg = NULL;
-+ }
-
-- 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 (qup->use_dma) {
-- ret = qup_i2c_bam_xfer(adap, &msgs[idx], num);
-- qup->use_dma = false;
-- 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]);
-- }
-- } while ((idx++ < (num - 1)) && !ret);
-+ if (!ret)
-+ ret = qup_i2c_bus_active(qup, ONE_BYTE);
-
- if (!ret)
-- ret = qup_i2c_change_state(qup, QUP_RESET_STATE);
-+ qup_i2c_change_state(qup, QUP_RESET_STATE);
-
- if (ret == 0)
- ret = num;
-@@ -1545,6 +1659,7 @@ static int qup_i2c_probe(struct platform
- u32 src_clk_freq = DEFAULT_SRC_CLK;
- u32 clk_freq = DEFAULT_CLK_FREQ;
- int blocks;
-+ bool is_qup_v1;
-
- qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL);
- if (!qup)
-@@ -1563,12 +1678,10 @@ static int qup_i2c_probe(struct platform
- 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;
-- qup->is_qup_v1 = true;
-- qup->write_tx_fifo = qup_i2c_write_tx_fifo_v1;
-- qup->read_rx_fifo = qup_i2c_read_rx_fifo_v1;
-- qup->write_rx_tags = qup_i2c_write_rx_tags_v1;
-+ is_qup_v1 = true;
- } else {
- qup->adap.algo = &qup_i2c_algo_v2;
-+ is_qup_v1 = false;
- ret = qup_i2c_req_dma(qup);
-
- if (ret == -EPROBE_DEFER)
-@@ -1694,14 +1807,31 @@ nodma:
- ret = -EIO;
- goto fail;
- }
-- qup->out_blk_sz = blk_sizes[size] / 2;
-+ qup->out_blk_sz = blk_sizes[size];
-
- size = QUP_INPUT_BLOCK_SIZE(io_mode);
- if (size >= ARRAY_SIZE(blk_sizes)) {
- ret = -EIO;
- goto fail;
- }
-- qup->in_blk_sz = blk_sizes[size] / 2;
-+ qup->in_blk_sz = blk_sizes[size];
-+
-+ if (is_qup_v1) {
-+ /*
-+ * in QUP v1, QUP_CONFIG uses N as 15 i.e 16 bits constitutes a
-+ * single transfer but the block size is in bytes so divide the
-+ * in_blk_sz and out_blk_sz by 2
-+ */
-+ qup->in_blk_sz /= 2;
-+ qup->out_blk_sz /= 2;
-+ qup->write_tx_fifo = qup_i2c_write_tx_fifo_v1;
-+ qup->read_rx_fifo = qup_i2c_read_rx_fifo_v1;
-+ qup->write_rx_tags = qup_i2c_write_rx_tags_v1;
-+ } else {
-+ qup->write_tx_fifo = qup_i2c_write_tx_fifo_v2;
-+ qup->read_rx_fifo = qup_i2c_read_rx_fifo_v2;
-+ qup->write_rx_tags = qup_i2c_write_rx_tags_v2;
-+ }
-
- size = QUP_OUTPUT_FIFO_SIZE(io_mode);
- qup->out_fifo_sz = qup->out_blk_sz * (2 << size);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-20 23:25:46 +0000