Re: [PATCH v2 2/2] I2C: JZ4780: Add support for the X1000.

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Hi Paul,

On 2019年12月16日 21:57, Paul Cercueil wrote:

Hi Zhou,
Le lun., déc. 16, 2019 at 18:06, 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxx>
---

Notes:
    v1->v2:
    Add code to check device_get_match_data(), if it return a NULL ptr,
    then print an error message and return -ENODEV.
drivers/i2c/busses/i2c-jz4780.c | 155 +++++++++++++++++++++++++++++----------- 
 1 file changed, 115 insertions(+), 40 deletions(-)
diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c 
index 25dcd73..f07a07c 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@xxxxxxxxxxxxxx>
  */

 #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 +135,33 @@ 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 {
+    enum ingenic_i2c_version version;
+
+    int fifosize;
+    int tx_level;
+    int rx_level;
+};
+
 struct jz4780_i2c {
     void __iomem        *iomem;
     int             irq;
     struct clk        *clk;
     struct i2c_adapter     adap;
+    const struct ingenic_i2c_config *cdata;
/* lock to protect rbuf and wbuf between xfer_rd/wr and irq handler */ 
     spinlock_t        lock;
@@ -340,11 +360,18 @@ 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->cdata->version >= ID_X1000)
+            jz4780_i2c_writew(i2c, X1000_I2C_SDAHD, hold_time);
+        else {
If only one branch of a conditional statement is a single statement, then you should use braces in both branches. 



Sure, I will fix this in v3.
See: https://www.kernel.org/doc/html/v4.10/process/coding-style.html#placing-braces-and-spaces 



+            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->cdata->version >= ID_X1000)
+            jz4780_i2c_writew(i2c, X1000_I2C_SDAHD, 0);
+        else
+            jz4780_i2c_writew(i2c, JZ4780_I2C_SDAHD, 0);
     }

     return 0;
@@ -359,9 +386,11 @@ 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->cdata->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 +428,18 @@ 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)
Sorry to be pedantic ;) but this line is not properly indented. You should indent with tab charaters (configure your IDE for one tab == 4 spaces) as much as possible, then use spaces to align the first word. 



Sure, I will fix this in v3.

Thanks and best regards!


With these two things fixed:
Acked-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>

Cheers,
-Paul



 {
     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->cdata->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 +494,44 @@ 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->cdata->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;
@@ -497,23 +540,26 @@ 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)) {
+                    (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->cdata->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) {
+                if ((!i2c->stop_hold) && (i2c->cdata->version <
+                        ID_X1000)) {
                     tmp = jz4780_i2c_readw(i2c,
-                                   JZ4780_I2C_CTRL);
+                            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 +613,22 @@ 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->cdata->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 +674,16 @@ 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->cdata->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 +766,25 @@ static const struct i2c_algorithm jz4780_i2c_algorithm = { 
     .functionality    = jz4780_i2c_functionality,
 };

+static const struct ingenic_i2c_config jz4780_i2c_config = {
+    .version = ID_JZ4780,
+
+    .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 = {
+    .version = ID_X1000,
+
+    .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 = &jz4780_i2c_config },
+    { .compatible = "ingenic,x1000-i2c", .data = &x1000_i2c_config },
     { /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, jz4780_i2c_of_matches);
@@ -734,6 +801,12 @@ static int jz4780_i2c_probe(struct platform_device *pdev) 
     if (!i2c)
         return -ENOMEM;

+    i2c->cdata = device_get_match_data(&pdev->dev);
+    if (!i2c->cdata) {
+        dev_err(&pdev->dev, "Error: No device match found\n");
+        return -ENODEV;
+    }
+
     i2c->adap.owner        = THIS_MODULE;
     i2c->adap.algo        = &jz4780_i2c_algorithm;
     i2c->adap.algo_data    = i2c;
@@ -777,9 +850,11 @@ 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->cdata->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);

--
2.7.4
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