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ryu: gate SCL to PI3USB9281

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As a short term workaround for the I2C problem of PI3USB9281, we're
gating its SCL input when it's not addressed. This workaround will be
removed once we have the silicon fix.

BUG=chrome-os-partner:31526
TEST=Sanity check on P0 boards.
BRANCH=None

Change-Id: I57daf25f2ad2d94ac7e4192050b4d6bbdae9d51d
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/214064
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Vic Yang
2014-08-25 15:12:34 -07:00
committed by chrome-internal-fetch
parent 687f9032d1
commit b22c10ce2e
4 changed files with 34 additions and 0 deletions
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8
board/ryu/board.h
View File

@@ -35,6 +35,14 @@
#undef CONFIG_CONSOLE_CMDHELP
#define CONFIG_INDUCTIVE_CHARGING
/*
* Pericom I2C workaround
* TODO(crosbug.com/p/31529): Remove this.
*/
#define CONFIG_I2C_SCL_GATE_PORT I2C_PORT_MASTER
#define CONFIG_I2C_SCL_GATE_ADDR 0x4a
#define CONFIG_I2C_SCL_GATE_GPIO GPIO_PERICOM_CLK_EN
/* Charging/Power configuration */
#undef CONFIG_BATTERY_RYU /* TODO implement */
#define CONFIG_BATTERY_BQ27541

3
board/ryu/gpio.inc
View File

@@ -90,6 +90,9 @@ GPIO(MASTER_I2C_SDA, B, 9, GPIO_INPUT, NULL)
GPIO(SLAVE_I2C_SCL, B, 10, GPIO_INPUT, NULL)
GPIO(SLAVE_I2C_SDA, B, 11, GPIO_INPUT, NULL)
/* SCL gating for PI3USB9281 */
GPIO(PERICOM_CLK_EN, C, 15, GPIO_OUT_LOW, NULL)
/* Case closed debugging. */
GPIO(PD_DISABLE_DEBUG, C, 5, GPIO_OUT_HIGH, NULL)
GPIO(SPI_FLASH_NSS, B, 12, GPIO_INPUT, NULL)

12
chip/stm32/i2c-stm32f0.c
View File

@@ -291,6 +291,12 @@ int i2c_xfer(int port, int slave_addr, const uint8_t *out, int out_bytes,
int rv = EC_SUCCESS;
int i;
#if defined(CONFIG_I2C_SCL_GATE_ADDR) && defined(CONFIG_I2C_SCL_GATE_PORT)
if (port == CONFIG_I2C_SCL_GATE_PORT &&
slave_addr == CONFIG_I2C_SCL_GATE_ADDR)
gpio_set_level(CONFIG_I2C_SCL_GATE_GPIO, 1);
#endif
ASSERT(out || !out_bytes);
ASSERT(in || !in_bytes);
@@ -367,6 +373,12 @@ xfer_exit:
STM32_I2C_CR1(port) |= STM32_I2C_CR1_PE;
}
#ifdef CONFIG_I2C_SCL_GATE_ADDR
if (port == CONFIG_I2C_SCL_GATE_PORT &&
slave_addr == CONFIG_I2C_SCL_GATE_ADDR)
gpio_set_level(CONFIG_I2C_SCL_GATE_GPIO, 0);
#endif
return rv;
}

11
include/config.h
View File

@@ -569,6 +569,17 @@
#undef CONFIG_I2C_PASSTHROUGH
#undef CONFIG_I2C_PASSTHRU_RESTRICTED
/*
* I2C SCL gating.
*
* If CONFIG_I2C_SCL_GATE_ADDR/PORT is defined, whenever the defined address
* is addressed, CONFIG_I2C_SCL_GATE_GPIO is set to high. When the I2C
* transaction is done, the pin is set back to low.
*/
#undef CONFIG_I2C_SCL_GATE_PORT
#undef CONFIG_I2C_SCL_GATE_ADDR
#undef CONFIG_I2C_SCL_GATE_GPIO
/*****************************************************************************/
/* Inductive charging */