hak5/wifipineapple-openwrt
1
0
Fork 0
mirror of https://github.com/hak5/wifipineapple-openwrt.git synced 2025-10-29 16:57:19 +00:00
Code Issues Packages Projects Releases Wiki Activity

ramips: add mt7621/3/8 support to the I2C driver

Browse Source 
Signed-off-by: John Crispin <blogic@openwrt.org>

Backport of r46959

git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@47095 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
John Crispin
2015-10-02 10:51:51 +00:00
parent 24ebe34bfd
commit 1b7515f6b0
1 changed files with 66 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

104
target/linux/ramips/patches-3.18/0052-i2c-MIPS-adds-ralink-I2C-driver.patch
View File

@@ -68,7 +68,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o
--- /dev/null
+++ b/drivers/i2c/busses/i2c-ralink.c
@@ -0,0 +1,299 @@
@@ -0,0 +1,327 @@
+/*
+ * drivers/i2c/busses/i2c-ralink.c
+ *
@@ -97,6 +97,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/i2c.h>
+#include <linux/io.h>
+#include <linux/err.h>
@@ -112,6 +113,8 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#define REG_STATUS_REG 0x18
+#define REG_STARTXFR_REG 0x1C
+#define REG_BYTECNT_REG 0x20
+#define REG_SM0CFG2 0x28
+#define REG_SM0CTL0 0x40
+
+#define I2C_STARTERR BIT(4)
+#define I2C_ACKERR BIT(3)
@@ -122,8 +125,6 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#define I2C_DEVADLEN_7 (6 << 2)
+#define I2C_ADDRDIS BIT(1)
+
+#define I2C_RETRY 0x1000
+
+#define CLKDIV_VALUE 200 // clock rate is 40M, 40M / (200*2) = 100k (standard i2c bus rate).
+//#define CLKDIV_VALUE 50 // clock rate is 40M, 40M / (50*2) = 400k (fast i2c bus rate).
+
@@ -131,8 +132,23 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#define WRITE_CMD 0x00
+#define READ_BLOCK 64
+
+#define SM0CTL0_OD BIT(31)
+#define SM0CTL0_VTRIG BIT(28)
+#define SM0CTL0_OUTHI BIT(6)
+#define SM0CTL0_STRETCH BIT(1)
+#define SM0CTL0_DEFAULT (SM0CTL0_OD | SM0CTL0_VTRIG | SM0CTL0_OUTHI | SM0CTL0_STRETCH)
+
+/* timeout waiting for I2C devices to respond (clock streching) */
+#define RT_I2C_TIMEOUT (msecs_to_jiffies(1000))
+
+enum {
+ I2C_TYPE_RALINK,
+ I2C_TYPE_MEDIATEK,
+};
+
+static void __iomem *membase;
+static struct i2c_adapter *adapter;
+static int hw_type;
+
+static void rt_i2c_w32(u32 val, unsigned reg)
+{
@@ -151,38 +167,48 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+
+static inline int rt_i2c_wait_rx_done(void)
+{
+ int retries = I2C_RETRY;
+ unsigned long timeout;
+
+ timeout = jiffies + RT_I2C_TIMEOUT;
+
+ do {
+ if (!retries--)
+ break;
+ } while(!(rt_i2c_r32(REG_STATUS_REG) & I2C_DATARDY));
+ if (time_after(jiffies, timeout))
+ return (-ETIMEDOUT);
+
+ return (retries < 0) ? -ETIMEDOUT : 0;
+ } while (!(rt_i2c_r32(REG_STATUS_REG) & I2C_DATARDY));
+
+ return 0;
+}
+
+static inline int rt_i2c_wait_idle(void)
+{
+ int retries = I2C_RETRY;
+ unsigned long timeout;
+
+ timeout = jiffies + RT_I2C_TIMEOUT;
+
+ do {
+ if (!retries--)
+ break;
+ } while(rt_i2c_r32(REG_STATUS_REG) & I2C_BUSY);
+ if (time_after(jiffies, timeout)) {
+ printk("i2c-read line busy\n");
+ return 1;
+ }
+ } while (rt_i2c_r32(REG_STATUS_REG) & I2C_BUSY);
+
+ return (retries < 0);
+ return 0;
+}
+
+static inline int rt_i2c_wait_tx_done(void)
+{
+ int retries = I2C_RETRY;
+ unsigned long timeout;
+
+ timeout = jiffies + RT_I2C_TIMEOUT;
+
+ do {
+ if (!retries--)
+ break;
+ } while(!(rt_i2c_r32(REG_STATUS_REG) & I2C_SDOEMPTY));
+ if (time_after(jiffies, timeout))
+ return (-ETIMEDOUT);
+
+ return (retries < 0) ? -ETIMEDOUT : 0;
+ } while (!(rt_i2c_r32(REG_STATUS_REG) & I2C_SDOEMPTY));
+
+ return 0;
+}
+
+static int rt_i2c_handle_msg(struct i2c_adapter *a, struct i2c_msg* msg)
@@ -199,10 +225,8 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+
+ if (msg->flags & I2C_M_RD) {
+ for (i = 0; i < nblock; i++) {
+ if (rt_i2c_wait_idle()) {
+ printk("i2c-read line busy\n");
+ if (rt_i2c_wait_idle())
+ return -ETIMEDOUT;
+ }
+ rt_i2c_w32(READ_BLOCK - 1, REG_BYTECNT_REG);
+ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG);
+ for (j = 0; j < READ_BLOCK; j++) {
@@ -214,10 +238,8 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ }
+ }
+
+ if (rt_i2c_wait_idle()) {
+ printk("i2c-read line busy\n");
+ if (rt_i2c_wait_idle())
+ return -ETIMEDOUT;
+ }
+ if (rem) {
+ rt_i2c_w32(rem - 1, REG_BYTECNT_REG);
+ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG);
@@ -231,10 +253,8 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG);
+ }
+ } else {
+ if (rt_i2c_wait_idle()) {
+ printk("i2c-write line busy\n");
+ if (rt_i2c_wait_idle())
+ return -ETIMEDOUT;
+ }
+ rt_i2c_w32(msg->len - 1, REG_BYTECNT_REG);
+ for (i = 0; i < msg->len; i++) {
+ rt_i2c_w32(msg->buf[i], REG_DATAOUT_REG);
@@ -255,16 +275,19 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ int i = 0;
+ int ret = 0;
+
+ if (rt_i2c_wait_idle()) {
+ printk("i2c-master_xfer line busy\n");
+ if (rt_i2c_wait_idle())
+ return -ETIMEDOUT;
+ }
+
+ device_reset(a->dev.parent);
+
+ rt_i2c_w32(m->addr, REG_DEVADDR_REG);
+ rt_i2c_w32(I2C_DEVADLEN_7 | I2C_ADDRDIS, REG_CONFIG_REG);
+ rt_i2c_w32(CLKDIV_VALUE, REG_CLKDIV_REG);
+ if (hw_type == I2C_TYPE_RALINK) {
+ rt_i2c_w32(CLKDIV_VALUE, REG_CLKDIV_REG);
+ } else {
+ rt_i2c_w32((CLKDIV_VALUE << 16) | SM0CTL0_DEFAULT, REG_SM0CTL0);
+ rt_i2c_w32(1, REG_SM0CFG2);
+ }
+
+ for (i = 0; i < n && !ret; i++) {
+ ret = rt_i2c_handle_msg(a, &m[i]);
@@ -287,11 +310,23 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ .functionality = rt_i2c_func,
+};
+
+static const struct of_device_id i2c_rt_dt_ids[] = {
+ { .compatible = "ralink,rt2880-i2c", .data = (void *) I2C_TYPE_RALINK },
+ { .compatible = "mediatek,mt7628-i2c", .data = (void *) I2C_TYPE_MEDIATEK },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids);
+
+static int rt_i2c_probe(struct platform_device *pdev)
+{
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ const struct of_device_id *match;
+ int ret;
+
+ match = of_match_device(i2c_rt_dt_ids, &pdev->dev);
+ hw_type = (int) match->data;
+
+ if (!res) {
+ dev_err(&pdev->dev, "no memory resource found\n");
+ return -ENODEV;
@@ -334,13 +369,6 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ return 0;
+}
+
+static const struct of_device_id i2c_rt_dt_ids[] = {
+ { .compatible = "ralink,rt2880-i2c", },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids);
+
+static struct platform_driver rt_i2c_driver = {
+ .probe = rt_i2c_probe,
+ .remove = rt_i2c_remove,