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SubjectRe: [PATCH 2/2] I2C: JZ4780: Add support for the X1000.
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Hi Paul,

On 2019年12月14日 05:21, Paul Cercueil wrote:
> Hi Zhou,
>
>
> Le jeu., déc. 12, 2019 at 23:50, 周琰杰 (Zhou Yanjie)
> <zhouyanjie@wanyeetech.com> a écrit :
>> Add support for probing i2c driver on the X1000 Soc from Ingenic.
>> call the corresponding fifo parameter according to the device
>> model obtained from the devicetree.
>>
>> Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
>> ---
>> drivers/i2c/busses/i2c-jz4780.c | 159
>> +++++++++++++++++++++++++++++-----------
>> 1 file changed, 117 insertions(+), 42 deletions(-)
>>
>> diff --git a/drivers/i2c/busses/i2c-jz4780.c
>> b/drivers/i2c/busses/i2c-jz4780.c
>> index 25dcd73..3b21896 100644
>> --- a/drivers/i2c/busses/i2c-jz4780.c
>> +++ b/drivers/i2c/busses/i2c-jz4780.c
>> @@ -4,6 +4,7 @@
>> *
>> * Copyright (C) 2006 - 2009 Ingenic Semiconductor Inc.
>> * Copyright (C) 2015 Imagination Technologies
>> + * Copyright (C) 2019 周琰杰 (Zhou Yanjie) <zhouyanjie@wanyeetech.com>
>> */
>>
>> #include <linux/bitops.h>
>> @@ -17,6 +18,7 @@
>> #include <linux/io.h>
>> #include <linux/kernel.h>
>> #include <linux/module.h>
>> +#include <linux/of_device.h>
>> #include <linux/platform_device.h>
>> #include <linux/sched.h>
>> #include <linux/slab.h>
>> @@ -55,6 +57,7 @@
>> #define JZ4780_I2C_ACKGC 0x98
>> #define JZ4780_I2C_ENSTA 0x9C
>> #define JZ4780_I2C_SDAHD 0xD0
>> +#define X1000_I2C_SDAHD 0x7C
>>
>> #define JZ4780_I2C_CTRL_STPHLD BIT(7)
>> #define JZ4780_I2C_CTRL_SLVDIS BIT(6)
>> @@ -73,6 +76,8 @@
>> #define JZ4780_I2C_STA_TFNF BIT(1)
>> #define JZ4780_I2C_STA_ACT BIT(0)
>>
>> +#define X1000_I2C_DC_STOP BIT(9)
>> +
>> static const char * const jz4780_i2c_abrt_src[] = {
>> "ABRT_7B_ADDR_NOACK",
>> "ABRT_10ADDR1_NOACK",
>> @@ -130,18 +135,32 @@ static const char * const jz4780_i2c_abrt_src[]
>> = {
>> #define JZ4780_I2CFLCNT_ADJUST(n) (((n) - 1) < 8 ? 8 : ((n) - 1))
>>
>> #define JZ4780_I2C_FIFO_LEN 16
>> -#define TX_LEVEL 3
>> -#define RX_LEVEL (JZ4780_I2C_FIFO_LEN - TX_LEVEL - 1)
>> +
>> +#define X1000_I2C_FIFO_LEN 64
>>
>> #define JZ4780_I2C_TIMEOUT 300
>>
>> #define BUFSIZE 200
>>
>> +enum ingenic_i2c_version {
>> + ID_JZ4780,
>> + ID_X1000,
>> +};
>> +
>> +/** ingenic_i2c_config: SOC specific config data. */
>> +struct ingenic_i2c_config {
>> + int fifosize;
>> + int tx_level;
>> + int rx_level;
>> +};
>> +
>> struct jz4780_i2c {
>> void __iomem *iomem;
>> int irq;
>> struct clk *clk;
>> struct i2c_adapter adap;
>> + enum ingenic_i2c_version version;
>> + const struct ingenic_i2c_config *cdata;
>>
>> /* lock to protect rbuf and wbuf between xfer_rd/wr and irq
>> handler */
>> spinlock_t lock;
>> @@ -340,11 +359,18 @@ static int jz4780_i2c_set_speed(struct
>> jz4780_i2c *i2c)
>>
>> if (hold_time >= 0) {
>> /*i2c hold time enable */
>> - hold_time |= JZ4780_I2C_SDAHD_HDENB;
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, hold_time);
>> + if (i2c->version >= ID_X1000)
>> + jz4780_i2c_writew(i2c, X1000_I2C_SDAHD, hold_time);
>> + else {
>> + hold_time |= JZ4780_I2C_SDAHD_HDENB;
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, hold_time);
>> + }
>> } else {
>> /* disable hold time */
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, 0);
>> + if (i2c->version >= ID_X1000)
>> + jz4780_i2c_writew(i2c, X1000_I2C_SDAHD, 0);
>> + else
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, 0);
>> }
>>
>> return 0;
>> @@ -359,9 +385,11 @@ static int jz4780_i2c_cleanup(struct jz4780_i2c
>> *i2c)
>> spin_lock_irqsave(&i2c->lock, flags);
>>
>> /* can send stop now if need */
>> - tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> - tmp &= ~JZ4780_I2C_CTRL_STPHLD;
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + if (i2c->version < ID_X1000) {
>> + tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> + tmp &= ~JZ4780_I2C_CTRL_STPHLD;
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + }
>>
>> /* disable all interrupts first */
>> jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, 0);
>> @@ -399,11 +427,18 @@ static int jz4780_i2c_prepare(struct jz4780_i2c
>> *i2c)
>> return jz4780_i2c_enable(i2c);
>> }
>>
>> -static void jz4780_i2c_send_rcmd(struct jz4780_i2c *i2c, int cmd_count)
>> +static void jz4780_i2c_send_rcmd(struct jz4780_i2c *i2c,
>> + int cmd_count, int cmd_left)
>> {
>> int i;
>>
>> - for (i = 0; i < cmd_count; i++)
>> + for (i = 0; i < cmd_count - 1; i++)
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_DC, JZ4780_I2C_DC_READ);
>> +
>> + if ((cmd_left == 0) && (i2c->version >= ID_X1000))
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_DC,
>> + JZ4780_I2C_DC_READ | X1000_I2C_DC_STOP);
>> + else
>> jz4780_i2c_writew(i2c, JZ4780_I2C_DC, JZ4780_I2C_DC_READ);
>> }
>>
>> @@ -458,37 +493,40 @@ static irqreturn_t jz4780_i2c_irq(int irqno,
>> void *dev_id)
>>
>> rd_left = i2c->rd_total_len - i2c->rd_data_xfered;
>>
>> - if (rd_left <= JZ4780_I2C_FIFO_LEN)
>> + if (rd_left <= i2c->cdata->fifosize)
>> jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, rd_left - 1);
>> }
>>
>> if (intst & JZ4780_I2C_INTST_TXEMP) {
>> if (i2c->is_write == 0) {
>> int cmd_left = i2c->rd_total_len - i2c->rd_cmd_xfered;
>> - int max_send = (JZ4780_I2C_FIFO_LEN - 1)
>> + int max_send = (i2c->cdata->fifosize - 1)
>> - (i2c->rd_cmd_xfered
>> - i2c->rd_data_xfered);
>> int cmd_to_send = min(cmd_left, max_send);
>>
>> if (i2c->rd_cmd_xfered != 0)
>> cmd_to_send = min(cmd_to_send,
>> - JZ4780_I2C_FIFO_LEN
>> - - TX_LEVEL - 1);
>> + i2c->cdata->fifosize
>> + - i2c->cdata->tx_level - 1);
>>
>> if (cmd_to_send) {
>> - jz4780_i2c_send_rcmd(i2c, cmd_to_send);
>> i2c->rd_cmd_xfered += cmd_to_send;
>> + cmd_left = i2c->rd_total_len - i2c->rd_cmd_xfered;
>> + jz4780_i2c_send_rcmd(i2c, cmd_to_send, cmd_left);
>> +
>> }
>>
>> - cmd_left = i2c->rd_total_len - i2c->rd_cmd_xfered;
>> if (cmd_left == 0) {
>> intmsk = jz4780_i2c_readw(i2c, JZ4780_I2C_INTM);
>> intmsk &= ~JZ4780_I2C_INTM_MTXEMP;
>> jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, intmsk);
>>
>> - tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> - tmp &= ~JZ4780_I2C_CTRL_STPHLD;
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + if (i2c->version < ID_X1000) {
>> + tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> + tmp &= ~JZ4780_I2C_CTRL_STPHLD;
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + }
>> }
>> } else {
>> unsigned short data;
>> @@ -496,24 +534,22 @@ static irqreturn_t jz4780_i2c_irq(int irqno,
>> void *dev_id)
>>
>> i2c_sta = jz4780_i2c_readw(i2c, JZ4780_I2C_STA);
>>
>> - while ((i2c_sta & JZ4780_I2C_STA_TFNF) &&
>> - (i2c->wt_len > 0)) {
>> + while ((i2c_sta & JZ4780_I2C_STA_TFNF) && (i2c->wt_len >
>> 0)) {
>> i2c_sta = jz4780_i2c_readw(i2c, JZ4780_I2C_STA);
>> data = *i2c->wbuf;
>> data &= ~JZ4780_I2C_DC_READ;
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_DC,
>> - data);
>> + if ((!i2c->stop_hold) && (i2c->version >= ID_X1000))
>> + data |= X1000_I2C_DC_STOP;
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_DC, data);
>> i2c->wbuf++;
>> i2c->wt_len--;
>> }
>>
>> if (i2c->wt_len == 0) {
>> - if (!i2c->stop_hold) {
>> - tmp = jz4780_i2c_readw(i2c,
>> - JZ4780_I2C_CTRL);
>> + if ((!i2c->stop_hold) && (i2c->version < ID_X1000)) {
>> + tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> tmp &= ~JZ4780_I2C_CTRL_STPHLD;
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL,
>> - tmp);
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> }
>>
>> jz4780_i2c_trans_done(i2c);
>> @@ -567,20 +603,22 @@ static inline int jz4780_i2c_xfer_read(struct
>> jz4780_i2c *i2c,
>> i2c->rd_data_xfered = 0;
>> i2c->rd_cmd_xfered = 0;
>>
>> - if (len <= JZ4780_I2C_FIFO_LEN)
>> + if (len <= i2c->cdata->fifosize)
>> jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, len - 1);
>> else
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, RX_LEVEL);
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_RXTL, i2c->cdata->rx_level);
>>
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, TX_LEVEL);
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, i2c->cdata->tx_level);
>>
>> jz4780_i2c_writew(i2c, JZ4780_I2C_INTM,
>> JZ4780_I2C_INTM_MRXFL | JZ4780_I2C_INTM_MTXEMP
>> | JZ4780_I2C_INTM_MTXABT | JZ4780_I2C_INTM_MRXOF);
>>
>> - tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> - tmp |= JZ4780_I2C_CTRL_STPHLD;
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + if (i2c->version < ID_X1000) {
>> + tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> + tmp |= JZ4780_I2C_CTRL_STPHLD;
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + }
>>
>> spin_unlock_irqrestore(&i2c->lock, flags);
>>
>> @@ -626,14 +664,16 @@ static inline int jz4780_i2c_xfer_write(struct
>> jz4780_i2c *i2c,
>> i2c->wbuf = buf;
>> i2c->wt_len = len;
>>
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, TX_LEVEL);
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_TXTL, i2c->cdata->tx_level);
>>
>> jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, JZ4780_I2C_INTM_MTXEMP
>> | JZ4780_I2C_INTM_MTXABT);
>>
>> - tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> - tmp |= JZ4780_I2C_CTRL_STPHLD;
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + if (i2c->version < ID_X1000) {
>> + tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> + tmp |= JZ4780_I2C_CTRL_STPHLD;
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + }
>>
>> spin_unlock_irqrestore(&i2c->lock, flags);
>>
>> @@ -716,8 +756,21 @@ static const struct i2c_algorithm
>> jz4780_i2c_algorithm = {
>> .functionality = jz4780_i2c_functionality,
>> };
>>
>> +static const struct ingenic_i2c_config jz4780_i2c_config = {
>> + .fifosize = JZ4780_I2C_FIFO_LEN,
>> + .tx_level = JZ4780_I2C_FIFO_LEN / 2,
>> + .rx_level = JZ4780_I2C_FIFO_LEN / 2 - 1,
>> +};
>> +
>> +static const struct ingenic_i2c_config x1000_i2c_config = {
>> + .fifosize = X1000_I2C_FIFO_LEN,
>> + .tx_level = X1000_I2C_FIFO_LEN / 2,
>> + .rx_level = X1000_I2C_FIFO_LEN / 2 - 1,
>> +};
>> +
>> static const struct of_device_id jz4780_i2c_of_matches[] = {
>> - { .compatible = "ingenic,jz4780-i2c", },
>> + { .compatible = "ingenic,jz4780-i2c", .data = (void *) ID_JZ4780 },
>> + { .compatible = "ingenic,x1000-i2c", .data = (void *) ID_X1000 },
>
> I think in general you should pass pointers to your ingenic_i2c_config
> structures directly in .data here, and have a "version" field in your
> ingenic_i2c_config struct.
>

Sure, I will change it in v2.

>
>> { /* sentinel */ }
>> };
>> MODULE_DEVICE_TABLE(of, jz4780_i2c_of_matches);
>> @@ -729,11 +782,24 @@ static int jz4780_i2c_probe(struct
>> platform_device *pdev)
>> unsigned short tmp;
>> struct resource *r;
>> struct jz4780_i2c *i2c;
>> + const struct platform_device_id *id = platform_get_device_id(pdev);
>> + const struct of_device_id *of_id = of_match_device(
>> + jz4780_i2c_of_matches, &pdev->dev);
>>
>> i2c = devm_kzalloc(&pdev->dev, sizeof(struct jz4780_i2c),
>> GFP_KERNEL);
>> if (!i2c)
>> return -ENOMEM;
>>
>> + if (of_id)
>> + i2c->version = (enum ingenic_i2c_version)of_id->data;
>> + else
>> + i2c->version = (enum ingenic_i2c_version)id->driver_data;
>> +
>> + if (i2c->version >= ID_X1000)
>> + i2c->cdata = &x1000_i2c_config;
>> + else
>> + i2c->cdata = &jz4780_i2c_config;
>> +
>
> Then you can replace all these lines with:
> i2c->cdata = device_get_match_data(dev);
>
> And your checks on i2c->version become checks on i2c->cdata->version.
>

OK, will change in v2.

>
>> i2c->adap.owner = THIS_MODULE;
>> i2c->adap.algo = &jz4780_i2c_algorithm;
>> i2c->adap.algo_data = i2c;
>> @@ -777,9 +843,11 @@ static int jz4780_i2c_probe(struct
>> platform_device *pdev)
>>
>> dev_info(&pdev->dev, "Bus frequency is %d KHz\n", i2c->speed);
>>
>> - tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> - tmp &= ~JZ4780_I2C_CTRL_STPHLD;
>> - jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + if (i2c->version < ID_X1000) {
>> + tmp = jz4780_i2c_readw(i2c, JZ4780_I2C_CTRL);
>> + tmp &= ~JZ4780_I2C_CTRL_STPHLD;
>> + jz4780_i2c_writew(i2c, JZ4780_I2C_CTRL, tmp);
>> + }
>>
>> jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, 0x0);
>>
>> @@ -809,6 +877,12 @@ static int jz4780_i2c_remove(struct
>> platform_device *pdev)
>> return 0;
>> }
>>
>> +static const struct platform_device_id ingenic_i2c_ids[] = {
>> + { "jz4780-i2c", ID_JZ4780 },
>> + { "x1000-i2c", ID_X1000 },
>> + {},
>
> I honestly think you can drop the platform ID table. It will never be
> used.
>

OK, just need to drop the platform ID table? Or any other changes need
to be made?

Thanks and best regards!

> Cheers,
> -Paul
>
>> +};
>> +
>> static struct platform_driver jz4780_i2c_driver = {
>> .probe = jz4780_i2c_probe,
>> .remove = jz4780_i2c_remove,
>> @@ -816,6 +890,7 @@ static struct platform_driver jz4780_i2c_driver = {
>> .name = "jz4780-i2c",
>> .of_match_table = of_match_ptr(jz4780_i2c_of_matches),
>> },
>> + .id_table = ingenic_i2c_ids,
>> };
>>
>> module_platform_driver(jz4780_i2c_driver);
>> --
>> 2.7.4
>>
>

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