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| author | Angelo Dureghello <angelo@kernel-space.org> | 2023-04-05 00:59:26 +0200 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2023-04-11 06:51:56 +0200 |
| commit | b6afa7cf62d7d3c618454009707a458a15a22942 (patch) | |
| tree | 355118744f5a73c4b8d5df19998eeb0e2aa13e97 /drivers | |
| parent | 987e20e5931df5b8e30f4ab363fe6c6adf94704f (diff) | |
| download | u-boot-b6afa7cf62d7d3c618454009707a458a15a22942.zip u-boot-b6afa7cf62d7d3c618454009707a458a15a22942.tar.gz u-boot-b6afa7cf62d7d3c618454009707a458a15a22942.tar.bz2 | |
i2c: fsl_i2c: fix m68k transferts
This driver is actually used for powerpc and m68k/ColdFire.
On ColdFire SoC's, interrupt flag get not set if IIEN flag (mbcr bit6,
interrupt enabled) is not set appropriately before each transfert.
As a result, the transfert hangs forever waiting for IIEN.
This patch set IIEN before each transfert, while considering this fix
as not harming powerpc arch.
Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/fsl_i2c.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c index d312f35..d9d8ee8 100644 --- a/drivers/i2c/fsl_i2c.c +++ b/drivers/i2c/fsl_i2c.c @@ -278,7 +278,8 @@ static void __i2c_init(const struct fsl_i2c_base *base, int speed, int set_i2c_bus_speed(base, i2c_clk, speed); writeb(slaveadd << 1, &base->adr);/* write slave address */ writeb(0x0, &base->sr); /* clear status register */ - writeb(I2C_CR_MEN, &base->cr); /* start I2C controller */ + /* start I2C controller */ + writeb(I2C_CR_MEN | I2C_CR_MIEN, &base->cr); timeval = get_ticks(); while (readb(&base->sr) & I2C_SR_MBB) { @@ -346,7 +347,7 @@ static int i2c_wait(const struct fsl_i2c_base *base, int write) static int i2c_write_addr(const struct fsl_i2c_base *base, u8 dev, u8 dir, int rsta) { - writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX + writeb(I2C_CR_MEN | I2C_CR_MIEN | I2C_CR_MSTA | I2C_CR_MTX | (rsta ? I2C_CR_RSTA : 0), &base->cr); @@ -378,7 +379,8 @@ static int __i2c_read_data(const struct fsl_i2c_base *base, u8 *data, { int i; - writeb(I2C_CR_MEN | I2C_CR_MSTA | ((length == 1) ? I2C_CR_TXAK : 0), + writeb(I2C_CR_MEN | I2C_CR_MIEN | + I2C_CR_MSTA | ((length == 1) ? I2C_CR_TXAK : 0), &base->cr); /* dummy read */ @@ -390,13 +392,13 @@ static int __i2c_read_data(const struct fsl_i2c_base *base, u8 *data, /* Generate ack on last next to last byte */ if (i == length - 2) - writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_TXAK, - &base->cr); + writeb(I2C_CR_MEN | I2C_CR_MIEN | I2C_CR_MSTA | + I2C_CR_TXAK, &base->cr); /* Do not generate stop on last byte */ if (i == length - 1) - writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX, - &base->cr); + writeb(I2C_CR_MEN | I2C_CR_MIEN | I2C_CR_MSTA | + I2C_CR_MTX, &base->cr); data[i] = readb(&base->dr); } |