diff options
Diffstat (limited to 'drivers/i2c/mxs_i2c.c')
| -rw-r--r-- | drivers/i2c/mxs_i2c.c | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/drivers/i2c/mxs_i2c.c b/drivers/i2c/mxs_i2c.c index a298c95e1..de3b19402 100644 --- a/drivers/i2c/mxs_i2c.c +++ b/drivers/i2c/mxs_i2c.c @@ -64,16 +64,17 @@ static void mxs_i2c_setup_read(uint8_t chip, int len) writel(I2C_QUEUECTRL_QUEUE_RUN, &i2c_regs->hw_i2c_queuectrl_set); } -static void mxs_i2c_write(uchar chip, uint addr, int alen, +static int mxs_i2c_write(uchar chip, uint addr, int alen, uchar *buf, int blen, int stop) { struct mxs_i2c_regs *i2c_regs = (struct mxs_i2c_regs *)MXS_I2C0_BASE; - uint32_t data; + uint32_t data, tmp; int i, remain, off; + int timeout = MXS_I2C_MAX_TIMEOUT; if ((alen > 4) || (alen == 0)) { debug("MXS I2C: Invalid address length\n"); - return; + return -EINVAL; } if (stop) @@ -106,6 +107,19 @@ static void mxs_i2c_write(uchar chip, uint addr, int alen, writel(data >> remain, &i2c_regs->hw_i2c_data); writel(I2C_QUEUECTRL_QUEUE_RUN, &i2c_regs->hw_i2c_queuectrl_set); + + while (--timeout) { + tmp = readl(&i2c_regs->hw_i2c_queuestat); + if (tmp & I2C_QUEUESTAT_WR_QUEUE_EMPTY) + break; + } + + if (!timeout) { + debug("MXS I2C: Failed transmitting data!\n"); + return -EINVAL; + } + + return 0; } static int mxs_i2c_wait_for_ack(void) @@ -154,7 +168,12 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) int ret; int i; - mxs_i2c_write(chip, addr, alen, NULL, 0, 0); + ret = mxs_i2c_write(chip, addr, alen, NULL, 0, 0); + if (ret) { + debug("MXS I2C: Failed writing address\n"); + return ret; + } + ret = mxs_i2c_wait_for_ack(); if (ret) { debug("MXS I2C: Failed writing address\n"); @@ -193,7 +212,12 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) { int ret; - mxs_i2c_write(chip, addr, alen, buffer, len, 1); + ret = mxs_i2c_write(chip, addr, alen, buffer, len, 1); + if (ret) { + debug("MXS I2C: Failed writing address\n"); + return ret; + } + ret = mxs_i2c_wait_for_ack(); if (ret) debug("MXS I2C: Failed writing address\n"); @@ -204,8 +228,9 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) int i2c_probe(uchar chip) { int ret; - mxs_i2c_write(chip, 0, 1, NULL, 0, 1); - ret = mxs_i2c_wait_for_ack(); + ret = mxs_i2c_write(chip, 0, 1, NULL, 0, 1); + if (!ret) + ret = mxs_i2c_wait_for_ack(); mxs_i2c_reset(); return ret; } |