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authorArmando Visconti <armando.visconti@st.com>2012-12-06 00:04:15 +0000
committerTom Rini <trini@ti.com>2012-12-11 13:17:31 -0700
commitac6e2fe6e4afe54a9c7ef0d93827a86e264814f2 (patch)
treec5fa3f06752067c8d079c97573c72c111ce7ef3a /drivers
parentc86d9ed3820bbd89e264261fb022bdf9448bfde7 (diff)
downloadu-boot-linaro-stable-ac6e2fe6e4afe54a9c7ef0d93827a86e264814f2.tar.gz
designware_i2c.c: Added the support for MULTI_BUS
This patch adds the capability to switch between 10 different I2C busses (from 0 to 9). Signed-off-by: Armando Visconti <armando.visconti@st.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/designware_i2c.c82
1 files changed, 81 insertions, 1 deletions
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c
index bf64a2a64..4e4bfd4f5 100644
--- a/drivers/i2c/designware_i2c.c
+++ b/drivers/i2c/designware_i2c.c
@@ -26,7 +26,12 @@
#include <asm/arch/hardware.h>
#include "designware_i2c.h"
-static struct i2c_regs *const i2c_regs_p =
+#ifdef CONFIG_I2C_MULTI_BUS
+static unsigned int bus_initialized[CONFIG_SYS_I2C_BUS_MAX];
+static unsigned int current_bus = 0;
+#endif
+
+static struct i2c_regs *i2c_regs_p =
(struct i2c_regs *)CONFIG_SYS_I2C_BASE;
/*
@@ -150,6 +155,10 @@ void i2c_init(int speed, int slaveadd)
enbl = readl(&i2c_regs_p->ic_enable);
enbl |= IC_ENABLE_0B;
writel(enbl, &i2c_regs_p->ic_enable);
+
+#ifdef CONFIG_I2C_MULTI_BUS
+ bus_initialized[current_bus] = 1;
+#endif
}
/*
@@ -344,3 +353,74 @@ int i2c_probe(uchar chip)
return ret;
}
+
+#ifdef CONFIG_I2C_MULTI_BUS
+int i2c_set_bus_num(unsigned int bus)
+{
+ switch (bus) {
+ case 0:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE;
+ break;
+#ifdef CONFIG_SYS_I2C_BASE1
+ case 1:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE1;
+ break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE2
+ case 2:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE2;
+ break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE3
+ case 3:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE3;
+ break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE4
+ case 4:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE4;
+ break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE5
+ case 5:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE5;
+ break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE6
+ case 6:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE6;
+ break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE7
+ case 7:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE7;
+ break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE8
+ case 8:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE8;
+ break;
+#endif
+#ifdef CONFIG_SYS_I2C_BASE9
+ case 9:
+ i2c_regs_p = (void *)CONFIG_SYS_I2C_BASE9;
+ break;
+#endif
+ default:
+ printf("Bad bus: %d\n", bus);
+ return -1;
+ }
+
+ current_bus = bus;
+
+ if (!bus_initialized[current_bus])
+ i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
+
+ return 0;
+}
+
+int i2c_get_bus_num(void)
+{
+ return current_bus;
+}
+#endif