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authorRainer Boschung <rainer.boschung@keymile.com>2014-02-03 08:45:40 +0100
committerYork Sun <yorksun@freescale.com>2014-02-03 08:38:50 -0800
commitf3e74d0a9fd8cdcbdc59b7c5a702aacc51908dca (patch)
treeb8334cbaabc11390c8f8c925c4ec3072b56aeb57 /board/keymile/kmp204x
parent87ea2c0ff345ad59280bdf4702c3450a81e3c265 (diff)
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kmp204x: I2C deblocking support
This patch adds support for using some GPIOs that are connected to the I2C bus to force the bus lines state and perform some bus deblocking sequences. The KM common deblocking algorithm from board/keymile/common/common.c is used. The GPIO lines used for deblocking the I2C bus are some external GPIOs provided by the QRIO CPLD: - SCL = GPIOA_20 - SDA = GPIOA_21 The QRIO GPIOs act in an open-drain-like manner, for 0 the line is driven low and for 1 the GPIO is set as input and the line gets pulled-up. Signed-off-by: Rainer Boschung <rainer.boschung@keymile.com> Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com> Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'board/keymile/kmp204x')
-rw-r--r--board/keymile/kmp204x/kmp204x.c53
1 files changed, 50 insertions, 3 deletions
diff --git a/board/keymile/kmp204x/kmp204x.c b/board/keymile/kmp204x/kmp204x.c
index bbb2453..a6c23a2 100644
--- a/board/keymile/kmp204x/kmp204x.c
+++ b/board/keymile/kmp204x/kmp204x.c
@@ -33,12 +33,51 @@ int checkboard(void)
return 0;
}
-/* TODO: implement the I2C deblocking function */
-int i2c_make_abort(void)
+/* I2C deblocking uses the algorithm defined in board/keymile/common/common.c
+ * 2 dedicated QRIO GPIOs externally pull the SCL and SDA lines
+ * For I2C only the low state is activly driven and high state is pulled-up
+ * by a resistor. Therefore the deblock GPIOs are used
+ * -> as an active output to drive a low state
+ * -> as an open-drain input to have a pulled-up high state
+ */
+
+/* QRIO GPIOs used for deblocking */
+#define DEBLOCK_PORT1 GPIO_A
+#define DEBLOCK_SCL1 20
+#define DEBLOCK_SDA1 21
+
+/* By default deblock GPIOs are floating */
+static void i2c_deblock_gpio_cfg(void)
+{
+ /* set I2C bus 1 deblocking GPIOs input, but 0 value for open drain */
+ qrio_gpio_direction_input(DEBLOCK_PORT1, DEBLOCK_SCL1);
+ qrio_gpio_direction_input(DEBLOCK_PORT1, DEBLOCK_SDA1);
+
+ qrio_set_gpio(DEBLOCK_PORT1, DEBLOCK_SCL1, 0);
+ qrio_set_gpio(DEBLOCK_PORT1, DEBLOCK_SDA1, 0);
+}
+
+void set_sda(int state)
+{
+ qrio_set_opendrain_gpio(DEBLOCK_PORT1, DEBLOCK_SDA1, state);
+}
+
+void set_scl(int state)
+{
+ qrio_set_opendrain_gpio(DEBLOCK_PORT1, DEBLOCK_SCL1, state);
+}
+
+int get_sda(void)
+{
+ return qrio_get_gpio(DEBLOCK_PORT1, DEBLOCK_SDA1);
+}
+
+int get_scl(void)
{
- return 1;
+ return qrio_get_gpio(DEBLOCK_PORT1, DEBLOCK_SCL1);
}
+
#define ZL30158_RST 8
#define ZL30343_RST 9
@@ -77,6 +116,14 @@ unsigned long get_board_sys_clk(unsigned long dummy)
return 66666666;
}
+int misc_init_f(void)
+{
+ /* configure QRIO pis for i2c deblocking */
+ i2c_deblock_gpio_cfg();
+
+ return 0;
+}
+
#define NUM_SRDS_BANKS 2
#define PHY_RST 15