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| author | Lei Wen <leiwen@marvell.com> | 2011-09-30 05:44:12 +0000 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2011-10-03 11:50:09 +0200 |
| commit | d308c9d35aee2578d0a69a9ecb8bc7fd7df8fa2d (patch) | |
| tree | c5fdd8ec8755a96abbfe9bcad001a058be5deb98 /drivers/i2c | |
| parent | 2be1ed349ca268d3867840fd28960785fd3def0b (diff) | |
| download | u-boot-d308c9d35aee2578d0a69a9ecb8bc7fd7df8fa2d.tar.gz u-boot-d308c9d35aee2578d0a69a9ecb8bc7fd7df8fa2d.tar.bz2 u-boot-d308c9d35aee2578d0a69a9ecb8bc7fd7df8fa2d.zip | |
I2C: mv_i2c: fix multi-bus init issue
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/mv_i2c.c | 42 |
1 files changed, 24 insertions, 18 deletions
diff --git a/drivers/i2c/mv_i2c.c b/drivers/i2c/mv_i2c.c index 8eb30e7082..b93922bdb2 100644 --- a/drivers/i2c/mv_i2c.c +++ b/drivers/i2c/mv_i2c.c @@ -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); } /* |