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> --- drivers/i2c/busses/i2c-qup.c | 330 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 323 insertions(+), 7 deletions(-) diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c index 131dc28..a4e20d9 100644 --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -43,6 +43,8 @@ #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 #define QUP_RUN_STATE 1 @@ -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) @@ -79,6 +83,7 @@ #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 +96,13 @@ #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 +114,15 @@ #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 +138,7 @@ 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 */ @@ -126,6 +148,14 @@ struct qup_i2c_dev { /* QUP core errors */ u32 qup_err; + int use_v2_tags; + + int (*qup_i2c_write_one)(struct qup_i2c_dev *qup, + struct i2c_msg *msg); + + int (*qup_i2c_read_one)(struct qup_i2c_dev *qup, + struct i2c_msg *msg); + struct completion xfer; }; @@ -266,7 +296,7 @@ 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; + int total = msg->len + qup->blk.tx_tag_len; if (total < qup->out_fifo_sz) { /* FIFO mode */ @@ -324,6 +354,134 @@ static int qup_i2c_issue_write(struct qup_i2c_dev *qup, struct i2c_msg *msg) return ret; } +static void qup_i2c_get_blk_data(struct qup_i2c_dev *qup, + struct i2c_msg *msg) +{ + memset(&qup->blk, 0, sizeof(qup->blk)); + + if (!qup->use_v2_tags) { + if (!(msg->flags & I2C_M_RD)) + qup->blk.tx_tag_len = 1; + return; + } + + 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_get_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_get_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) { @@ -346,7 +504,27 @@ static int qup_i2c_wait_for_complete(struct qup_i2c_dev *qup, return ret; } -static int qup_i2c_write_one(struct qup_i2c_dev *qup, struct i2c_msg *msg) +static int qup_i2c_write_one_v2(struct qup_i2c_dev *qup, struct i2c_msg *msg) +{ + int ret = 0; + + 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); + +err: + return ret; +} + +static int qup_i2c_write_one_v1(struct qup_i2c_dev *qup, struct i2c_msg *msg) { int ret = 0; @@ -378,6 +556,8 @@ static int qup_i2c_write(struct qup_i2c_dev *qup, struct i2c_msg *msg) qup->msg = msg; qup->pos = 0; enable_irq(qup->irq); + qup_i2c_get_blk_data(qup, msg); + qup_i2c_set_write_mode(qup, msg); ret = qup_i2c_change_state(qup, QUP_RUN_STATE); @@ -386,7 +566,7 @@ static int qup_i2c_write(struct qup_i2c_dev *qup, struct i2c_msg *msg) writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL); - ret = qup_i2c_write_one(qup, msg); + ret = qup->qup_i2c_write_one(qup, msg); if (ret) goto err; @@ -401,15 +581,21 @@ err: static void qup_i2c_set_read_mode(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); } } @@ -426,7 +612,6 @@ static void qup_i2c_issue_read(struct qup_i2c_dev *qup, struct i2c_msg *msg) writel(val, qup->base + QUP_OUT_FIFO_BASE); } - static int qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg) { u32 val = 0; @@ -453,7 +638,68 @@ static int qup_i2c_read_fifo(struct qup_i2c_dev *qup, struct i2c_msg *msg) return ret; } -static int qup_i2c_read_one(struct qup_i2c_dev *qup, struct i2c_msg *msg) +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; + + 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: + return ret; +} + +static int qup_i2c_read_one_v1(struct qup_i2c_dev *qup, struct i2c_msg *msg) { int ret = 0; @@ -498,6 +744,7 @@ static int qup_i2c_read(struct qup_i2c_dev *qup, struct i2c_msg *msg) qup->pos = 0; enable_irq(qup->irq); + qup_i2c_get_blk_data(qup, msg); qup_i2c_set_read_mode(qup, msg->len); @@ -507,7 +754,7 @@ static int qup_i2c_read(struct qup_i2c_dev *qup, struct i2c_msg *msg) writel(qup->clk_ctl, qup->base + QUP_I2C_CLK_CTL); - ret = qup_i2c_read_one(qup, msg); + ret = qup->qup_i2c_read_one(qup, msg); err: disable_irq(qup->irq); @@ -569,6 +816,60 @@ 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(qup, &msgs[idx]); + else + ret = qup_i2c_write(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); @@ -588,6 +889,11 @@ static struct i2c_adapter_quirks qup_i2c_quirks = { .max_read_len = QUP_READ_LIMIT, }; +static const struct i2c_algorithm qup_i2c_algo_v2 = { + .master_xfer = qup_i2c_xfer_v2, + .functionality = qup_i2c_func, +}; + static void qup_i2c_enable_clocks(struct qup_i2c_dev *qup) { clk_prepare_enable(qup->clk); @@ -628,6 +934,17 @@ 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->qup_i2c_write_one = qup_i2c_write_one_v1; + qup->qup_i2c_read_one = qup_i2c_read_one_v1; + } else { + qup->adap.algo = &qup_i2c_algo_v2; + qup->qup_i2c_write_one = qup_i2c_write_one_v2; + qup->qup_i2c_read_one = qup_i2c_read_one_v2; + qup->use_v2_tags = 1; + } + /* We support frequencies up to FAST Mode (400KHz) */ if (!clk_freq || clk_freq > 400000) { dev_err(qup->dev, "clock frequency not supported %d\n", @@ -723,7 +1040,6 @@ 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; -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html