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authorJohn Crispin <john@openwrt.org>2013-07-08 09:01:57 +0000
committerJohn Crispin <john@openwrt.org>2013-07-08 09:01:57 +0000
commita6091a5c71859b8db19eac1355f977d5b44c2a10 (patch)
treeab6ac66128380aa680187100d64dacf8e823e7f5 /target
parenteba9b8a324056cefc28646301a7c239a2ede8b63 (diff)
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ralink: unbreak ralink i2c support
Signed-off-by: John Crispin <blogic@openwrt.org> SVN-Revision: 37202
Diffstat (limited to 'target')
-rw-r--r--target/linux/ramips/patches-3.9/0153-i2c-MIPS-adds-ralink-I2C-driver.patch38
1 files changed, 23 insertions, 15 deletions
diff --git a/target/linux/ramips/patches-3.9/0153-i2c-MIPS-adds-ralink-I2C-driver.patch b/target/linux/ramips/patches-3.9/0153-i2c-MIPS-adds-ralink-I2C-driver.patch
index 88d6ec9ef2..0daf217a93 100644
--- a/target/linux/ramips/patches-3.9/0153-i2c-MIPS-adds-ralink-I2C-driver.patch
+++ b/target/linux/ramips/patches-3.9/0153-i2c-MIPS-adds-ralink-I2C-driver.patch
@@ -13,8 +13,10 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
create mode 100644 Documentation/devicetree/bindings/i2c/i2c-ralink.txt
create mode 100644 drivers/i2c/busses/i2c-ralink.c
---- /dev/null
-+++ b/Documentation/devicetree/bindings/i2c/i2c-ralink.txt
+Index: linux-3.9.8/Documentation/devicetree/bindings/i2c/i2c-ralink.txt
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-3.9.8/Documentation/devicetree/bindings/i2c/i2c-ralink.txt 2013-07-02 11:36:42.944155612 +0200
@@ -0,0 +1,27 @@
+I2C for Ralink platforms
+
@@ -43,9 +45,11 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ };
+ };
+};
---- a/drivers/i2c/busses/Kconfig
-+++ b/drivers/i2c/busses/Kconfig
-@@ -628,6 +628,10 @@ config I2C_PXA_SLAVE
+Index: linux-3.9.8/drivers/i2c/busses/Kconfig
+===================================================================
+--- linux-3.9.8.orig/drivers/i2c/busses/Kconfig 2013-06-27 19:41:32.000000000 +0200
++++ linux-3.9.8/drivers/i2c/busses/Kconfig 2013-07-02 11:36:42.944155612 +0200
+@@ -628,6 +628,10 @@
is necessary for systems where the PXA may be a target on the
I2C bus.
@@ -56,9 +60,11 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
config HAVE_S3C2410_I2C
bool
help
---- a/drivers/i2c/busses/Makefile
-+++ b/drivers/i2c/busses/Makefile
-@@ -62,6 +62,7 @@ obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
+Index: linux-3.9.8/drivers/i2c/busses/Makefile
+===================================================================
+--- linux-3.9.8.orig/drivers/i2c/busses/Makefile 2013-06-27 19:41:32.000000000 +0200
++++ linux-3.9.8/drivers/i2c/busses/Makefile 2013-07-02 11:36:42.944155612 +0200
+@@ -62,6 +62,7 @@
obj-$(CONFIG_I2C_PUV3) += i2c-puv3.o
obj-$(CONFIG_I2C_PXA) += i2c-pxa.o
obj-$(CONFIG_I2C_PXA_PCI) += i2c-pxa-pci.o
@@ -66,8 +72,10 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
obj-$(CONFIG_I2C_S6000) += i2c-s6000.o
obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o
---- /dev/null
-+++ b/drivers/i2c/busses/i2c-ralink.c
+Index: linux-3.9.8/drivers/i2c/busses/i2c-ralink.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-3.9.8/drivers/i2c/busses/i2c-ralink.c 2013-07-08 10:56:00.068287905 +0200
@@ -0,0 +1,274 @@
+/*
+ * drivers/i2c/busses/i2c-ralink.c
@@ -122,7 +130,8 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+
+#define I2C_RETRY 0x400
+
-+#define CLKDIV_VALUE 600
++#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).
+
+#define READ_CMD 0x01
+#define WRITE_CMD 0x00
@@ -211,16 +220,15 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ } else {
+ rt_i2c_wait_idle();
+ rt_i2c_w32(msg->len - 1, REG_BYTECNT_REG);
-+ rt_i2c_w32(msg->buf[0], REG_DATAOUT_REG);
-+ rt_i2c_w32(WRITE_CMD, REG_STARTXFR_REG);
-+ for (i = 1; i < msg->len; i++) {
++ for (i = 0; i < msg->len; i++) {
+ rt_i2c_w32(msg->buf[i], REG_DATAOUT_REG);
++ rt_i2c_w32(WRITE_CMD, REG_STARTXFR_REG);
+ if (rt_i2c_wait_tx_done())
+ return -1;
+ }
+ }
+
-+ return msg->len;
++ return 0;
+}
+
+static int rt_i2c_master_xfer(struct i2c_adapter *a, struct i2c_msg *m, int n)