static void poweroff_seq(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
if (apb->init_disabled || apb->state == ARCHE_PLATFORM_STATE_OFF)
return;
if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
gpio_is_valid(apb->spi_en_gpio))
devm_gpio_free(dev, apb->spi_en_gpio);
/* disable the clock */
if (gpio_is_valid(apb->clk_en_gpio))
gpio_set_value(apb->clk_en_gpio, 0);
if (!IS_ERR(apb->vcore) && regulator_is_enabled(apb->vcore) > 0)
regulator_disable(apb->vcore);
if (!IS_ERR(apb->vio) && regulator_is_enabled(apb->vio) > 0)
regulator_disable(apb->vio);
/* As part of exit, put APB back in reset state */
assert_reset(apb->resetn_gpio);
apb->state = ARCHE_PLATFORM_STATE_OFF;
/* TODO: May have to send an event to SVC about this exit */
}
/*
* Note: Please do not modify the below sequence, as it is as per the spec
*/
static int coldboot_seq(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
int ret;
if (apb->init_disabled ||
apb->state == ARCHE_PLATFORM_STATE_ACTIVE)
return 0;
/* Hold APB in reset state */
assert_reset(apb->resetn_gpio);
if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
gpio_is_valid(apb->spi_en_gpio))
devm_gpio_free(dev, apb->spi_en_gpio);
/* Enable power to APB */
if (!IS_ERR(apb->vcore)) {
ret = regulator_enable(apb->vcore);
if (ret) {
dev_err(dev, "failed to enable core regulator\n");
return ret;
}
}
if (!IS_ERR(apb->vio)) {
ret = regulator_enable(apb->vio);
if (ret) {
dev_err(dev, "failed to enable IO regulator\n");
return ret;
}
}
apb_bootret_deassert(dev);
/* On DB3 clock was not mandatory */
if (gpio_is_valid(apb->clk_en_gpio))
gpio_set_value(apb->clk_en_gpio, 1);
usleep_range(100, 200);
/* deassert reset to APB : Active-low signal */
deassert_reset(apb->resetn_gpio);
apb->state = ARCHE_PLATFORM_STATE_ACTIVE;
return 0;
}
static int fw_flashing_seq(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct arche_apb_ctrl_drvdata *apb = platform_get_drvdata(pdev);
int ret;
if (apb->init_disabled ||
apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING)
return 0;
ret = regulator_enable(apb->vcore);
if (ret) {
dev_err(dev, "failed to enable core regulator\n");
return ret;
}
ret = regulator_enable(apb->vio);
if (ret) {
dev_err(dev, "failed to enable IO regulator\n");
return ret;
}
if (gpio_is_valid(apb->spi_en_gpio)) {
unsigned long flags;
if (apb->spi_en_polarity_high)
flags = GPIOF_OUT_INIT_HIGH;
else
flags = GPIOF_OUT_INIT_LOW;
ret = devm_gpio_request_one(dev, apb->spi_en_gpio,
flags, "apb_spi_en");
if (ret) {
dev_err(dev, "Failed requesting SPI bus en gpio %d\n",
apb->spi_en_gpio);
return ret;
}
}
/* for flashing device should be in reset state */
assert_reset(apb->resetn_gpio);
apb->state = ARCHE_PLATFORM_STATE_FW_FLASHING;
return 0;
}
static void apb_ctrl_cleanup(struct arche_apb_ctrl_drvdata *apb)
{
/* disable the clock */
if (gpio_is_valid(apb->clk_en_gpio))
gpio_set_value(apb->clk_en_gpio, 0);
if (!IS_ERR(apb->vcore) && regulator_is_enabled(apb->vcore) > 0)
regulator_disable(apb->vcore);
if (!IS_ERR(apb->vio) && regulator_is_enabled(apb->vio) > 0)
regulator_disable(apb->vio);
/* As part of exit, put APB back in reset state */
assert_reset(apb->resetn_gpio);
apb->state = APB_STATE_OFF;
/* TODO: May have to send an event to SVC about this exit */
}