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I2C: mv_i2c: fix multi-bus init issue

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When enable the multi-bus, the current_bus is not inited in the original
implementation, which make the i2c operation unpredicatable.

Signed-off-by: Lei Wen <leiwen@marvell.com>
This commit is contained in:
Lei Wen 2011-09-30 05:44:12 +00:00 committed by Heiko Schocher
parent 2be1ed349c
commit d308c9d35a
1 changed files with 24 additions and 18 deletions
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42
drivers/i2c/mv_i2c.c
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@ -67,6 +67,27 @@ struct mv_i2c {
};
static struct mv_i2c *base;
static void i2c_board_init(struct mv_i2c *base)
{
#ifdef CONFIG_SYS_I2C_INIT_BOARD
u32 icr;
/*
* call board specific i2c bus reset routine before accessing the
* environment, which might be in a chip on that bus. For details
* about this problem see doc/I2C_Edge_Conditions.
*
* disable I2C controller first, otherwhise it thinks we want to
* talk to the slave port...
*/
icr = readl(&base->icr);
writel(readl(&base->icr) & ~(ICR_SCLE | ICR_IUE), &base->icr);
i2c_init_board();
writel(icr, &base->icr);
#endif
}
#ifdef CONFIG_I2C_MULTI_BUS
static u32 i2c_regs[CONFIG_MV_I2C_NUM] = CONFIG_MV_I2C_REG;
static unsigned int bus_initialized[CONFIG_MV_I2C_NUM];
@ -83,7 +104,7 @@ int i2c_set_bus_num(unsigned int bus)
current_bus = bus;
if (!bus_initialized[current_bus]) {
i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
i2c_board_init(base);
bus_initialized[current_bus] = 1;
}
@ -264,28 +285,13 @@ i2c_transfer_finish:
void i2c_init(int speed, int slaveaddr)
{
#ifdef CONFIG_I2C_MULTI_BUS
current_bus = 0;
base = (struct mv_i2c *)i2c_regs[current_bus];
#else
base = (struct mv_i2c *)CONFIG_MV_I2C_REG;
#endif
#ifdef CONFIG_SYS_I2C_INIT_BOARD
u32 icr;
/*
* call board specific i2c bus reset routine before accessing the
* environment, which might be in a chip on that bus. For details
* about this problem see doc/I2C_Edge_Conditions.
*
* disable I2C controller first, otherwhise it thinks we want to
* talk to the slave port...
*/
icr = readl(&base->icr);
writel(readl(&base->icr) & ~(ICR_SCLE | ICR_IUE), &base->icr);
i2c_init_board();
writel(icr, &base->icr);
#endif
i2c_board_init(base);
}
/*