int arche_apb_ctrl_probe(struct platform_device *pdev)
{
int ret;
struct arche_apb_ctrl_drvdata *apb;
struct device *dev = &pdev->dev;
apb = devm_kzalloc(&pdev->dev, sizeof(*apb), GFP_KERNEL);
if (!apb)
return -ENOMEM;
ret = apb_ctrl_get_devtree_data(pdev, apb);
if (ret) {
dev_err(dev, "failed to get apb devicetree data %d\n", ret);
return ret;
}
ret = apb_ctrl_init_seq(pdev, apb);
if (ret) {
dev_err(dev, "failed to set init state of control signal %d\n",
ret);
return ret;
}
/* deassert reset to APB : Active-low signal */
deassert_reset(apb->resetn_gpio);
apb->state = APB_STATE_ACTIVE;
platform_set_drvdata(pdev, apb);
export_gpios(apb);
dev_info(&pdev->dev, "Device registered successfully\n");
return 0;
}
/*
* 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;
}