diff options
Diffstat (limited to 'src/cpu/samsung')
| -rw-r--r-- | src/cpu/samsung/exynos5420/i2c.c | 55 |
1 files changed, 36 insertions, 19 deletions
diff --git a/src/cpu/samsung/exynos5420/i2c.c b/src/cpu/samsung/exynos5420/i2c.c index b16d068c5c..acb5bcf7cc 100644 --- a/src/cpu/samsung/exynos5420/i2c.c +++ b/src/cpu/samsung/exynos5420/i2c.c @@ -357,23 +357,39 @@ void i2c_init(unsigned bus_num, int speed, int slaveadd) /* * Check whether the transfer is complete. + * Return values: + * 0 - transfer not done + * 1 - transfer finished successfully + * -1 - transfer failed */ static int hsi2c_check_transfer(struct exynos5_hsi2c *i2c) { uint32_t status = read32(&i2c->usi_trans_status); - if (status & HSI2C_TRANS_ABORT) - printk(BIOS_ERR, "%s: Transaction aborted.\n", __func__); - if (status & HSI2C_NO_DEV_ACK) - printk(BIOS_ERR, "%s: No ack from device.\n", __func__); - if (status & HSI2C_NO_DEV) - printk(BIOS_ERR, "%s: No response from device.\n", __func__); - if (status & HSI2C_TIMEOUT_AUTO) - printk(BIOS_ERR, "%s: Transaction time out.\n", __func__); - return !!(status & HSI2C_MASTER_BUSY); + if (status & (HSI2C_TRANS_ABORT | HSI2C_NO_DEV_ACK | + HSI2C_NO_DEV | HSI2C_TIMEOUT_AUTO)) { + if (status & HSI2C_TRANS_ABORT) + printk(BIOS_ERR, + "%s: Transaction aborted.\n", __func__); + if (status & HSI2C_NO_DEV_ACK) + printk(BIOS_ERR, + "%s: No ack from device.\n", __func__); + if (status & HSI2C_NO_DEV) + printk(BIOS_ERR, + "%s: No response from device.\n", __func__); + if (status & HSI2C_TIMEOUT_AUTO) + printk(BIOS_ERR, + "%s: Transaction time out.\n", __func__); + return -1; + } + return !(status & HSI2C_MASTER_BUSY); } /* * Wait for the transfer to finish. + * Return values: + * 0 - transfer not done + * 1 - transfer finished successfully + * -1 - transfer failed */ static int hsi2c_wait_for_transfer(struct exynos5_hsi2c *i2c) { @@ -383,17 +399,18 @@ static int hsi2c_wait_for_transfer(struct exynos5_hsi2c *i2c) end = current; mono_time_add_usecs(&end, HSI2C_TIMEOUT * 1000); while (mono_time_before(¤t, &end)) { - if (!hsi2c_check_transfer(i2c)) - return 0; + int ret = hsi2c_check_transfer(i2c); + if (ret) + return ret; udelay(5); timer_monotonic_get(¤t); } - return 1; + return 0; } static int hsi2c_senddata(struct exynos5_hsi2c *i2c, uint8_t *data, int len) { - while (hsi2c_check_transfer(i2c) && len) { + while (!hsi2c_check_transfer(i2c) && len) { if (!(read32(&i2c->usi_fifo_stat) & HSI2C_TX_FIFO_FULL)) { write32(*data++, &i2c->usi_txdata); len--; @@ -404,7 +421,7 @@ static int hsi2c_senddata(struct exynos5_hsi2c *i2c, uint8_t *data, int len) static int hsi2c_recvdata(struct exynos5_hsi2c *i2c, uint8_t *data, int len) { - while (hsi2c_check_transfer(i2c) && len) { + while (!hsi2c_check_transfer(i2c) && len) { if (!(read32(&i2c->usi_fifo_stat) & HSI2C_RX_FIFO_EMPTY)) { *data++ = read32(&i2c->usi_rxdata); len--; @@ -422,7 +439,7 @@ static int hsi2c_write(struct exynos5_hsi2c *i2c, { uint32_t i2c_auto_conf; - if (hsi2c_wait_for_transfer(i2c)) + if (hsi2c_wait_for_transfer(i2c) != 1) return -1; /* chip address */ @@ -441,7 +458,7 @@ static int hsi2c_write(struct exynos5_hsi2c *i2c, if (hsi2c_senddata(i2c, addr, alen) || hsi2c_senddata(i2c, data, len) || - hsi2c_wait_for_transfer(i2c)) { + hsi2c_wait_for_transfer(i2c) != 1) { return -1; } @@ -460,7 +477,7 @@ static int hsi2c_read(struct exynos5_hsi2c *i2c, uint32_t i2c_auto_conf; /* start read */ - if (hsi2c_wait_for_transfer(i2c)) + if (hsi2c_wait_for_transfer(i2c) != 1) return -1; /* chip address */ @@ -475,7 +492,7 @@ static int hsi2c_read(struct exynos5_hsi2c *i2c, &i2c->usi_auto_conf); if (hsi2c_senddata(i2c, addr, alen) || - hsi2c_wait_for_transfer(i2c)) { + hsi2c_wait_for_transfer(i2c) != 1) { return -1; } @@ -490,7 +507,7 @@ static int hsi2c_read(struct exynos5_hsi2c *i2c, write32(i2c_auto_conf, &i2c->usi_auto_conf); if (hsi2c_recvdata(i2c, data, len) || - hsi2c_wait_for_transfer(i2c)) { + hsi2c_wait_for_transfer(i2c) != 1) { return -1; } |