From: Andy Gross <agross@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx> Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx> --- [v2] Addressed comments from Ivan T. Ivanov <iivanov@xxxxxxxxxx> drivers/i2c/busses/i2c-qup.c | 336 ++++++++++++++++++++++++++++++++++++++----- 1 file changed, 299 insertions(+), 37 deletions(-) diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c index 49c6cba..8605557 100644 --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -24,6 +24,7 @@ #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/slab.h> /* QUP Registers */ #define QUP_CONFIG 0x000 @@ -42,6 +43,7 @@ #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 +71,8 @@ #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) @@ -80,17 +84,30 @@ #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) #define QUP_INPUT_BLOCK_SIZE(x) (((x) >> 5) & 0x03) #define QUP_INPUT_FIFO_SIZE(x) (((x) >> 7) & 0x07) -/* QUP tags */ +/* QUP V1 tags */ #define QUP_TAG_START (1 << 8) #define QUP_TAG_DATA (2 << 8) #define QUP_TAG_STOP (3 << 8) #define QUP_TAG_REC (4 << 8) +/* QUP v2 tags */ +#define QUP_TAG_V2_HS 0xff +#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 + +/* frequency definitions for high speed and max speed */ +#define I2C_QUP_CLK_FAST_FREQ 1000000 + /* Status, Error flags */ #define I2C_STATUS_WR_BUFFER_FULL BIT(0) #define I2C_STATUS_BUS_ACTIVE BIT(8) @@ -99,6 +116,13 @@ #define QUP_READ_LIMIT 256 +struct qup_i2c_block { + int blocks; + u8 *block_tag_len; + int *block_data_len; + int block_pos; +}; + struct qup_i2c_dev { struct device *dev; void __iomem *base; @@ -112,9 +136,17 @@ struct qup_i2c_dev { int in_fifo_sz; int out_blk_sz; int in_blk_sz; - + struct qup_i2c_block blk; unsigned long one_byte_t; + int is_hs; + bool use_v2_tags; + + int tx_tag_len; + int rx_tag_len; + u8 *tags; + int tags_pos; + struct i2c_msg *msg; /* Current posion in user message buffer */ int pos; @@ -262,8 +294,13 @@ static int qup_i2c_wait_ready(struct qup_i2c_dev *qup, int op, bool val, 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 */ - int total = msg->len + 1; + /* Total Number of entries to shift out, including the tags */ + int total; + + if (qup->use_v2_tags) + total = msg->len + qup->tx_tag_len; + else + total = msg->len + 1; /* plus start tag */ if (total < qup->out_fifo_sz) { /* FIFO mode */ @@ -277,7 +314,7 @@ 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 void qup_i2c_issue_write_v1(struct qup_i2c_dev *qup, struct i2c_msg *msg) { u32 addr = msg->addr << 1; u32 qup_tag; @@ -318,6 +355,134 @@ static void qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg) } } +static void qup_i2c_create_tag_v2(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, prev_len = 0; + int blocks = 0; + int rem; + int block_len = 0; + int data_len; + + qup->blk.block_pos = 0; + qup->pos = 0; + qup->blk.blocks = (msg->len + QUP_READ_LIMIT - 1) / QUP_READ_LIMIT; + rem = msg->len % QUP_READ_LIMIT; + + /* 2 tag bytes for each block + 2 extra bytes for first block */ + qup->tags = kzalloc((qup->blk.blocks * 2) + 2, GFP_KERNEL); + qup->blk.block_tag_len = kzalloc(qup->blk.blocks, GFP_KERNEL); + qup->blk.block_data_len = kzalloc(sizeof(*qup->blk.block_data_len) * + qup->blk.blocks, GFP_KERNEL); + + while (blocks < qup->blk.blocks) { + /* 0 is used to specify a READ_LIMIT of 256 bytes */ + data_len = (blocks < (qup->blk.blocks - 1)) ? 0 : rem; + + /* Send START and ADDR bytes only for the first block */ + if (!blocks) { + qup->tags[len++] = QUP_TAG_V2_START; + + if (qup->is_hs) { + qup->tags[len++] = QUP_TAG_V2_HS; + qup->tags[len++] = QUP_TAG_V2_START; + } + + qup->tags[len++] = addr & 0xff; + if (msg->flags & I2C_M_TEN) + qup->tags[len++] = addr >> 8; + } + + /* Send _STOP commands for the last block */ + if (blocks == (qup->blk.blocks - 1)) { + if (msg->flags & I2C_M_RD) + qup->tags[len++] = QUP_TAG_V2_DATARD_STOP; + else + qup->tags[len++] = QUP_TAG_V2_DATAWR_STOP; + } else { + if (msg->flags & I2C_M_RD) + qup->tags[len++] = QUP_TAG_V2_DATARD; + else + qup->tags[len++] = QUP_TAG_V2_DATAWR; + } + + qup->tags[len++] = data_len; + block_len = len - prev_len; + prev_len = len; + qup->blk.block_tag_len[blocks] = block_len; + + if (!data_len) + qup->blk.block_data_len[blocks] = QUP_READ_LIMIT; + else + qup->blk.block_data_len[blocks] = data_len; + + qup->tags_pos = 0; + blocks++; + } + + qup->tx_tag_len = len; + + if (msg->flags & I2C_M_RD) + qup->rx_tag_len = (qup->blk.blocks * 2); + else + qup->rx_tag_len = 0; +} + +static u32 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; + + while (len > 0) { + if (qup_i2c_wait_ready(qup, QUP_OUT_FULL, 0, 4)) { + dev_err(qup->dev, "timeout for fifo out full"); + break; + } + + 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 0; +} + +static void qup_i2c_issue_xfer_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg) +{ + u32 data_len = 0, tag_len; + + tag_len = qup->blk.block_tag_len[qup->blk.block_pos]; + + if (!(msg->flags & I2C_M_RD)) + data_len = qup->blk.block_data_len[qup->blk.block_pos]; + + qup_i2c_send_data(qup, tag_len, qup->tags, data_len, msg->buf); +} + +static void qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg + *msg) +{ + if (qup->use_v2_tags) + qup_i2c_issue_xfer_v2(qup, msg); + else + qup_i2c_issue_write_v1(qup, msg); +} + static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg) { unsigned long left; @@ -326,6 +491,11 @@ static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg) qup->msg = msg; qup->pos = 0; + if (qup->use_v2_tags) + qup_i2c_create_tag_v2(qup, msg); + else + qup->blk.blocks = 0; + enable_irq(qup->irq); qup_i2c_set_write_mode(qup, msg); @@ -360,7 +530,8 @@ static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg) ret = -EIO; goto err; } - } while (qup->pos < msg->len); + qup->blk.block_pos++; + } while (qup->blk.block_pos < qup->blk.blocks); /* Wait for the outstanding data in the fifo to drain */ ret = qup_i2c_wait_ready(qup, QUP_OUT_NOT_EMPTY, 0, 1); @@ -374,6 +545,11 @@ err: static void qup_i2c_set_read_mode(struct qup_i2c_dev *qup, int len) { + if (qup->use_v2_tags) { + len += qup->rx_tag_len; + writel(qup->tx_tag_len, qup->base + QUP_MX_WRITE_CNT); + } + if (len < qup->in_fifo_sz) { /* FIFO mode */ writel(QUP_REPACK_EN, qup->base + QUP_IO_MODE); @@ -386,7 +562,8 @@ static void qup_i2c_set_read_mode(struct qup_i2c_dev *qup, int len) } } -static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg) +static void qup_i2c_issue_read_v1(struct qup_i2c_dev *qup, + struct i2c_msg *msg) { u32 addr, len, val; @@ -399,20 +576,28 @@ static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg) writel(val, qup->base + QUP_OUT_FIFO_BASE); } +static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg + *msg) +{ + if (qup->use_v2_tags) + qup_i2c_issue_xfer_v2(qup, msg); + else + qup_i2c_issue_read_v1(qup, msg); +} -static void qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg) +static void qup_i2c_read_fifo_v1(struct qup_i2c_dev *qup, struct i2c_msg *msg) { - u32 opflags; u32 val = 0; int idx; + int len = msg->len + qup->rx_tag_len; - for (idx = 0; qup->pos < msg->len; idx++) { + for (idx = 0; qup->pos < len; idx++) { if ((idx & 1) == 0) { /* Check that FIFO have data */ - opflags = readl(qup->base + QUP_OPERATIONAL); - if (!(opflags & QUP_IN_NOT_EMPTY)) + if (qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY, 1, 4)) { + dev_err(qup->dev, "timeout for fifo not empty"); break; - + } /* Reading 2 words at time */ val = readl(qup->base + QUP_IN_FIFO_BASE); @@ -423,11 +608,49 @@ static void qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg) } } +static void qup_i2c_read_fifo_v2(struct qup_i2c_dev *qup, + struct i2c_msg *msg) +{ + u32 val; + int idx; + int pos = 0; + /* 2 extra bytes for read tags */ + int total = qup->blk.block_data_len[qup->blk.block_pos] + 2; + + while (pos < total) { + /* Check that FIFO have data */ + if (qup_i2c_wait_ready(qup, QUP_IN_NOT_EMPTY, 1, 4)) { + dev_err(qup->dev, "timeout for fifo not empty"); + break; + } + 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) + return; + + msg->buf[qup->pos++] = val & 0xff; + } + } +} + +static void qup_i2c_read_fifo(struct qup_i2c_dev *qup, + struct i2c_msg *msg) +{ + if (qup->use_v2_tags) + qup_i2c_read_fifo_v2(qup, msg); + else + qup_i2c_read_fifo_v1(qup, msg); +} + static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg) { unsigned long left; int ret; - /* * 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 @@ -441,6 +664,10 @@ static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg) qup->msg = msg; qup->pos = 0; + if (qup->use_v2_tags) + qup_i2c_create_tag_v2(qup, msg); + else + qup->blk.blocks = 0; enable_irq(qup->irq); @@ -452,17 +679,17 @@ static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg) writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL); - ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE); - if (ret) - goto err; + do { + ret = qup_i2c_change_state(qup, QUP_PAUSE_STATE); + if (ret) + goto err; - qup_i2c_issue_read(qup, msg); + qup_i2c_issue_read(qup, msg); - ret = qup_i2c_change_state(qup, QUP_RUN_STATE); - if (ret) - goto err; + ret = qup_i2c_change_state(qup, QUP_RUN_STATE); + if (ret) + goto err; - do { left = wait_for_completion_timeout(&qup->xfer, HZ); if (!left) { writel(1, qup->base + QUP_SW_RESET); @@ -478,7 +705,8 @@ static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg) } qup_i2c_read_fifo(qup, msg); - } while (qup->pos < msg->len); + qup->blk.block_pos++; + } while (qup->blk.block_pos < qup->blk.blocks); err: disable_irq(qup->irq); @@ -504,7 +732,12 @@ static int qup_i2c_xfer(struct i2c_adapter *adap, goto out; /* Configure QUP as I2C mini core */ - writel(I2C_MINI_CORE | I2C_N_VAL, qup->base + QUP_CONFIG); + if (qup->use_v2_tags) { + writel(I2C_MINI_CORE | I2C_N_VAL_V2, qup->base + QUP_CONFIG); + writel(QUP_V2_TAGS_EN, qup->base + QUP_I2C_MASTER_GEN); + } else { + writel(I2C_MINI_CORE | I2C_N_VAL, qup->base + QUP_CONFIG); + } for (idx = 0; idx < num; idx++) { if (msgs[idx].len == 0) { @@ -517,6 +750,8 @@ static int qup_i2c_xfer(struct i2c_adapter *adap, goto out; } + reinit_completion(&qup->xfer); + if (msgs[idx].flags & I2C_M_RD) ret = qup_i2c_read_one(qup, &msgs[idx]); else @@ -534,6 +769,12 @@ static int qup_i2c_xfer(struct i2c_adapter *adap, ret = num; out: + if (qup->use_v2_tags) { + kfree(qup->tags); + kfree(qup->blk.block_tag_len); + kfree(qup->blk.block_data_len); + } + pm_runtime_mark_last_busy(qup->dev); pm_runtime_put_autosuspend(qup->dev); @@ -556,6 +797,14 @@ static void qup_i2c_enable_clocks(struct qup_i2c_dev *qup) clk_prepare_enable(qup->pclk); } +static const struct of_device_id qup_i2c_dt_match[] = { + { .compatible = "qcom,i2c-qup-v1.1.1"}, + { .compatible = "qcom,i2c-qup-v2.1.1"}, + { .compatible = "qcom,i2c-qup-v2.2.1"}, + {} +}; +MODULE_DEVICE_TABLE(of, qup_i2c_dt_match); + static void qup_i2c_disable_clocks(struct qup_i2c_dev *qup) { u32 config; @@ -577,8 +826,9 @@ static int qup_i2c_probe(struct platform_device *pdev) struct resource *res; u32 io_mode, hw_ver, size; int ret, fs_div, hs_div; - int src_clk_freq; + int src_clk_freq, clk_freq_max; u32 clk_freq = 100000; + const struct of_device_id *of_id; qup = devm_kzalloc(&pdev->dev, sizeof(*qup), GFP_KERNEL); if (!qup) @@ -590,8 +840,19 @@ static int qup_i2c_probe(struct platform_device *pdev) of_property_read_u32(node, "clock-frequency", &clk_freq); - /* We support frequencies up to FAST Mode (400KHz) */ - if (!clk_freq || clk_freq > 400000) { + of_id = of_match_node(qup_i2c_dt_match, node); + + if (of_device_is_compatible(pdev->dev.of_node, + "qcom,i2c-qup-v1.1.1")) { + qup->use_v2_tags = 0; + clk_freq_max = 400000; + } else { + qup->use_v2_tags = 1; + clk_freq_max = 3400000; + } + + /* We support frequencies up to HIGH SPEED Mode (3400KHz) */ + if (!clk_freq || clk_freq > clk_freq_max) { dev_err(qup->dev, "clock frequency not supported %d\n", clk_freq); return -EINVAL; @@ -669,8 +930,17 @@ static int qup_i2c_probe(struct platform_device *pdev) qup->in_fifo_sz = qup->in_blk_sz * (2 << size); src_clk_freq = clk_get_rate(qup->clk); - fs_div = ((src_clk_freq / clk_freq) / 2) - 3; - hs_div = 3; + if (clk_freq > I2C_QUP_CLK_FAST_FREQ) { + fs_div = I2C_QUP_CLK_FAST_FREQ; + hs_div = (src_clk_freq / clk_freq) / 3; + + qup->is_hs = 1; + } else { + fs_div = ((src_clk_freq / clk_freq) / 2) - 3; + hs_div = 3; + } + + hs_div = min_t(int, hs_div, 0x7); qup->clk_ctl = (hs_div << 8) | (fs_div & 0xff); /* @@ -767,14 +1037,6 @@ static const struct dev_pm_ops qup_i2c_qup_pm_ops = { NULL) }; -static const struct of_device_id qup_i2c_dt_match[] = { - { .compatible = "qcom,i2c-qup-v1.1.1" }, - { .compatible = "qcom,i2c-qup-v2.1.1" }, - { .compatible = "qcom,i2c-qup-v2.2.1" }, - {} -}; -MODULE_DEVICE_TABLE(of, qup_i2c_dt_match); - static struct platform_driver qup_i2c_driver = { .probe = qup_i2c_probe, .remove = qup_i2c_remove, -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html