void
interface_init(void)
{
debug("i2c init");
/* allocate DMA handles and initialise DMA */
rx_dma = stm32_dmachannel(DMACHAN_I2C1_RX);
i2c_rx_setup();
tx_dma = stm32_dmachannel(DMACHAN_I2C1_TX);
i2c_tx_setup();
/* enable the i2c block clock and reset it */
modifyreg32(STM32_RCC_APB1ENR, 0, RCC_APB1ENR_I2C1EN);
modifyreg32(STM32_RCC_APB1RSTR, 0, RCC_APB1RSTR_I2C1RST);
modifyreg32(STM32_RCC_APB1RSTR, RCC_APB1RSTR_I2C1RST, 0);
/* configure the i2c GPIOs */
stm32_configgpio(GPIO_I2C1_SCL);
stm32_configgpio(GPIO_I2C1_SDA);
/* soft-reset the block */
rCR1 |= I2C_CR1_SWRST;
rCR1 = 0;
/* set for DMA operation */
rCR2 |= I2C_CR2_ITEVFEN | I2C_CR2_ITERREN | I2C_CR2_DMAEN;
/* set the frequency value in CR2 */
rCR2 &= ~I2C_CR2_FREQ_MASK;
rCR2 |= STM32_PCLK1_FREQUENCY / 1000000;
/* set divisor and risetime for fast mode */
uint16_t result = STM32_PCLK1_FREQUENCY / (400000 * 25);
if (result < 1) {
result = 1;
}
result = 3;
rCCR &= ~I2C_CCR_CCR_MASK;
rCCR |= I2C_CCR_DUTY | I2C_CCR_FS | result;
rTRISE = (uint16_t)((((STM32_PCLK1_FREQUENCY / 1000000) * 300) / 1000) + 1);
/* set our device address */
rOAR1 = 0x1a << 1;
/* enable event interrupts */
irq_attach(STM32_IRQ_I2C1EV, i2c_interrupt);
irq_attach(STM32_IRQ_I2C1ER, i2c_interrupt);
up_enable_irq(STM32_IRQ_I2C1EV);
up_enable_irq(STM32_IRQ_I2C1ER);
/* and enable the I2C port */
rCR1 |= I2C_CR1_ACK | I2C_CR1_PE;
#ifdef DEBUG
i2c_dump();
#endif
}
int google_chromeec_command(struct chromeec_command *cec_command)
{
EcCommandI2c cmd;
EcResponseI2c resp;
int bus = CONFIG_EC_GOOGLE_CHROMEEC_I2C_BUS;
int chip = CONFIG_EC_GOOGLE_CHROMEEC_I2C_CHIP;
size_t size_i2c_cmd = (sizeof(cmd) - sizeof(cmd.data) +
cec_command->cmd_size_in + 1),
size_i2c_resp = (sizeof(resp) - sizeof(resp.data) +
cec_command->cmd_size_out + 1);
if (cec_command->cmd_size_in > MAX_I2C_DATA_SIZE ||
cec_command->cmd_size_out > MAX_I2C_DATA_SIZE) {
printk(BIOS_ERR, "%s: Command data size too large (%d,%d)\n",
__func__, cec_command->cmd_size_in,
cec_command->cmd_size_out);
cec_command->cmd_code = EC_RES_INVALID_PARAM;
return 1;
}
/* Construct command. */
cmd.version = EC_CMD_VERSION0 + cec_command->cmd_version;
cmd.command = cec_command->cmd_code;
cmd.length = cec_command->cmd_size_in;
memcpy(cmd.data, cec_command->cmd_data_in, cmd.length);
ec_fill_checksum(&cmd);
/* Start I2C communication */
i2c_dump(bus, chip, (const uint8_t *)&cmd, size_i2c_cmd);
if (i2c_write(bus, chip, 0, 0, (uint8_t *)&cmd, size_i2c_cmd) != 0) {
printk(BIOS_ERR, "%s: Cannot complete write to i2c-%d:%#x\n",
__func__, bus, chip);
cec_command->cmd_code = EC_RES_ERROR;
return 1;
}
if (i2c_read(bus, chip, 0, 0, (uint8_t *)&resp, size_i2c_resp) != 0) {
printk(BIOS_ERR, "%s: Cannot complete read from i2c-%d:%#x\n",
__func__, bus, chip);
cec_command->cmd_code = EC_RES_ERROR;
return 1;
}
/* Verify and return response */
cec_command->cmd_code = resp.response;
if (resp.response != EC_RES_SUCCESS) {
printk(BIOS_DEBUG, "%s: Received bad result code %d\n",
__func__, (int)resp.response);
return 1;
}
if (resp.length > cec_command->cmd_size_out) {
printk(BIOS_ERR, "%s: Received len %#02x too large\n",
__func__, (int)resp.length);
cec_command->cmd_code = EC_RES_INVALID_RESPONSE;
return 1;
}
if (!ec_verify_checksum(&resp)) {
cec_command->cmd_code = EC_RES_INVALID_CHECKSUM;
return 1;
}
cec_command->cmd_size_out = resp.length;
memcpy(cec_command->cmd_data_out, resp.data, resp.length);
return 0;
}