diff options
Diffstat (limited to 'arch/arm/boards/skov-imx8mp/board.c')
| -rw-r--r-- | arch/arm/boards/skov-imx8mp/board.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/arch/arm/boards/skov-imx8mp/board.c b/arch/arm/boards/skov-imx8mp/board.c new file mode 100644 index 0000000000..3cb7a8752a --- /dev/null +++ b/arch/arm/boards/skov-imx8mp/board.c @@ -0,0 +1,300 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include "linux/kernel.h" +#include <bootsource.h> +#include <common.h> +#include <deep-probe.h> +#include <envfs.h> +#include <environment.h> +#include <globalvar.h> +#include <gpio.h> +#include <init.h> +#include <io.h> +#include <mach/imx/bbu.h> +#include <mach/imx/generic.h> +#include <mach/imx/iomux-mx8mp.h> + +struct skov_imx8mp_priv { + struct device *dev; + int variant_id; +}; + +static struct skov_imx8mp_priv *skov_imx8mp_priv; + +#define GPIO_HW_VARIANT {\ + {IMX_GPIO_NR(1, 8), GPIOF_DIR_IN | GPIOF_ACTIVE_HIGH, "var0"}, \ + {IMX_GPIO_NR(1, 9), GPIOF_DIR_IN | GPIOF_ACTIVE_HIGH, "var1"}, \ + {IMX_GPIO_NR(1, 10), GPIOF_DIR_IN | GPIOF_ACTIVE_HIGH, "var2"}, \ + {IMX_GPIO_NR(1, 11), GPIOF_DIR_IN | GPIOF_ACTIVE_HIGH, "var3"}, \ + {IMX_GPIO_NR(1, 12), GPIOF_DIR_IN | GPIOF_ACTIVE_HIGH, "var4"}, \ + {IMX_GPIO_NR(1, 13), GPIOF_DIR_IN | GPIOF_ACTIVE_HIGH, "var5"}, \ + {IMX_GPIO_NR(1, 14), GPIOF_DIR_IN | GPIOF_ACTIVE_HIGH, "var6"}, \ + {IMX_GPIO_NR(1, 15), GPIOF_DIR_IN | GPIOF_ACTIVE_HIGH, "var7"}, \ +} + +struct skov_imx8mp_storage { + const char *name; + const char *env_path; + const char *dev_path; + enum bootsource bootsource; + int bootsource_ext_id; + bool mmc_boot_part; +}; + +enum skov_imx8mp_boot_source { + SKOV_BOOT_SOURCE_EMMC, + SKOV_BOOT_SOURCE_SD, + SKOV_BOOT_SOURCE_UNKNOWN, +}; + +static const struct skov_imx8mp_storage skov_imx8mp_storages[] = { + [SKOV_BOOT_SOURCE_EMMC] = { + /* default boot source */ + .name = "eMMC", + .env_path = "/chosen/environment-emmc", + .dev_path = "/dev/mmc2", + .bootsource = BOOTSOURCE_MMC, + .bootsource_ext_id = 2, + .mmc_boot_part = true, + }, + [SKOV_BOOT_SOURCE_SD] = { + .name = "SD", + .env_path = "/chosen/environment-sd", + .dev_path = "/dev/mmc1.barebox", + .bootsource = BOOTSOURCE_MMC, + .bootsource_ext_id = 1, + }, +}; + +struct board_description { + const char *dts_compatible; + const char *dts_compatible_hdmi; + unsigned flags; +}; + +#define SKOV_IMX8MP_HAS_HDMI BIT(0) + +static const struct board_description imx8mp_variants[] = { + [0] = { + .dts_compatible = "skov,imx8mp-skov-revb-lt6", + }, + [1] = { + .dts_compatible = "skov,imx8mp-skov-revb-mi1010ait-1cp1", + .dts_compatible_hdmi = "skov,imx8mp-skov-revb-hdmi", + .flags = SKOV_IMX8MP_HAS_HDMI, + }, + [2] = { + .dts_compatible = "skov,imx8mp-skov-revc-bd500", + }, +}; + +static const struct board_description imx8mp_basic_variant = { + .dts_compatible = "skov,imx8mp-skov-basic", +}; + +static int skov_imx8mp_fixup(struct device_node *root, void *data) +{ + struct device_node *chosen = of_create_node(root, "/chosen"); + const char *of_board = "skov,imx8mp-board-version"; + struct skov_imx8mp_priv *priv = data; + struct device *dev = priv->dev; + int ret; + + ret = of_property_write_u32(chosen, of_board, priv->variant_id); + if (ret) + dev_err(dev, "Failed to fixup %s: %pe\n", of_board, + ERR_PTR(ret)); + + return 0; +} + +static int skov_imx8mp_get_variant_id(uint *id) +{ + struct gpio gpios_rev[] = GPIO_HW_VARIANT; + struct device_node *gpio_np; + u32 hw_rev; + int ret; + + gpio_np = of_find_node_by_name_address(NULL, "gpio@30200000"); + if (!gpio_np) + return -ENODEV; + + ret = of_device_ensure_probed(gpio_np); + if (ret) + return ret; + + ret = gpio_array_to_id(gpios_rev, ARRAY_SIZE(gpios_rev), &hw_rev); + if (ret) + goto exit_get_id; + + *id = hw_rev; + + return 0; +exit_get_id: + pr_err("Failed to read gpio ID: %pe\n", ERR_PTR(ret)); + return ret; +} + +static int skov_imx8mp_get_hdmi(struct device *dev) +{ + const char *env = "state.display.external"; + struct device_node *state_np; + unsigned int val = 0; + int ret; + + state_np = of_find_node_by_name_address(NULL, "state"); + if (!state_np) { + dev_err(dev, "Failed to find state node\n"); + return -ENODEV; + } + + ret = of_device_ensure_probed(state_np); + if (ret) { + dev_err(dev, "Failed to probe state node: %pe\n", ERR_PTR(ret)); + return ret; + } + + ret = getenv_uint(env, &val); + if (ret) { + dev_err(dev, "Failed to read %s: %pe\n", env, ERR_PTR(ret)); + return ret; + } + + return val; +} + +static int skov_imx8mp_init_variant(struct skov_imx8mp_priv *priv) +{ + const struct board_description *variant; + struct device *dev = priv->dev; + const char *compatible; + unsigned int v = 0; + int ret; + + ret = skov_imx8mp_get_variant_id(&v); + if (ret) + return ret; + + priv->variant_id = v; + + if (v >= ARRAY_SIZE(imx8mp_variants)) { + dev_warn(dev, "Unsupported variant %u. Fall back to basic variant\n", v); + variant = &imx8mp_basic_variant; + } else { + variant = &imx8mp_variants[v]; + } + + if (variant->flags & SKOV_IMX8MP_HAS_HDMI) { + ret = skov_imx8mp_get_hdmi(dev); + if (ret < 0) + return ret; + + if (ret) + compatible = variant->dts_compatible_hdmi; + else + compatible = variant->dts_compatible; + } else { + compatible = variant->dts_compatible; + } + + of_prepend_machine_compatible(NULL, compatible); + + return 0; +} + +static void skov_imx8mp_enable_env(struct device *dev, + const struct skov_imx8mp_storage *st, + bool *enabled) +{ + int ret; + + if (bootsource_get() != st->bootsource || + bootsource_get_instance() != st->bootsource_ext_id) + return; + + ret = of_device_enable_path(st->env_path); + if (ret) { + dev_err(dev, "Failed to enable environment path: %s, %pe\n", + st->env_path, ERR_PTR(ret)); + return; + } + + *enabled = true; +} + +static void skov_imx8mp_add_bbu(struct device *dev, + const struct skov_imx8mp_storage *st, + bool default_env) +{ + unsigned long flags = 0; + int ret; + + if (default_env) + flags |= BBU_HANDLER_FLAG_DEFAULT; + + if (st->mmc_boot_part) { + ret = imx8m_bbu_internal_mmcboot_register_handler(st->name, + st->dev_path, + flags); + } else { + ret = imx8m_bbu_internal_mmc_register_handler(st->name, + st->dev_path, + flags); + } + if (ret) + dev_err(dev, "Failed to register %s BBU handler: %pe\n", + st->name, ERR_PTR(ret)); +} + +static void skov_imx8mp_init_storage(struct device *dev) +{ + int default_boot_src = SKOV_BOOT_SOURCE_EMMC; + int i; + + for (i = 0; i < ARRAY_SIZE(skov_imx8mp_storages); i++) { + bool enabled_env = false; + + skov_imx8mp_enable_env(dev, &skov_imx8mp_storages[i], + &enabled_env); + if (enabled_env) + default_boot_src = i; + } + + for (i = 0; i < ARRAY_SIZE(skov_imx8mp_storages); i++) + skov_imx8mp_add_bbu(dev, &skov_imx8mp_storages[i], + i == default_boot_src); +} + +static int skov_imx8mp_probe(struct device *dev) +{ + struct skov_imx8mp_priv *priv; + int ret; + + priv = xzalloc(sizeof(*priv)); + priv->dev = dev; + skov_imx8mp_priv = priv; + + skov_imx8mp_init_storage(dev); + + skov_imx8mp_init_variant(priv); + + ret = of_register_fixup(skov_imx8mp_fixup, priv); + if (ret) + dev_err(dev, "Failed to register fixup: %pe\n", ERR_PTR(ret)); + + return 0; +} + +static const struct of_device_id skov_imx8mp_of_match[] = { + /* generic, barebox specific compatible for all board variants */ + { .compatible = "skov,imx8mp" }, + { /* Sentinel */ } +}; +BAREBOX_DEEP_PROBE_ENABLE(skov_imx8mp_of_match); + +static struct driver skov_imx8mp_board_driver = { + .name = "skov-imx8m", + .probe = skov_imx8mp_probe, + .of_compatible = skov_imx8mp_of_match, +}; +coredevice_platform_driver(skov_imx8mp_board_driver); |