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| author | Alexey Brodkin <Alexey.Brodkin@synopsys.com> | 2013-11-07 17:52:18 +0400 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2013-11-13 06:22:06 +0100 |
| commit | 8b7c87253960aac0b670e606d8dbe2f64b1e5652 (patch) | |
| tree | adbd81a856837d53e60e7bd94541c40002968071 | |
| parent | a2e0a45d2e1e258cbe9bd3dbbe7bc7cacbf7a84e (diff) | |
| download | u-boot-imx-8b7c87253960aac0b670e606d8dbe2f64b1e5652.zip u-boot-imx-8b7c87253960aac0b670e606d8dbe2f64b1e5652.tar.gz u-boot-imx-8b7c87253960aac0b670e606d8dbe2f64b1e5652.tar.bz2 | |
designware_i2c: disable i2c controller during target address setup
As it is stated in DesignWare I2C databook: writes to IC_TAR (0x4)
register succeed only when IC_ENABLE[0] is set to 0.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Tom Rini <trini@ti.com>
cc: Armando Visconti <armando.visconti@st.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Heiko Schocher <hs@denx.de>
Cc: Vipin KUMAR <vipin.kumar@st.com>
Cc: Tom Rix <Tom.Rix@windriver.com>
Cc: Mischa Jonker <mjonker@synopsys.com>
| -rw-r--r-- | drivers/i2c/designware_i2c.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index c2f0662..c5c6015 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -151,7 +151,19 @@ void i2c_init(int speed, int slaveadd) */ static void i2c_setaddress(unsigned int i2c_addr) { + unsigned int enbl; + + /* Disable i2c */ + enbl = readl(&i2c_regs_p->ic_enable); + enbl &= ~IC_ENABLE_0B; + writel(enbl, &i2c_regs_p->ic_enable); + writel(i2c_addr, &i2c_regs_p->ic_tar); + + /* Enable i2c */ + enbl = readl(&i2c_regs_p->ic_enable); + enbl |= IC_ENABLE_0B; + writel(enbl, &i2c_regs_p->ic_enable); } /* |