diff options
Diffstat (limited to 'src/ec/kontron/kempld')
| -rw-r--r-- | src/ec/kontron/kempld/Makefile.inc | 1 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/chip.h | 11 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/kempld.c | 8 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/kempld_gpio.c | 71 | ||||
| -rw-r--r-- | src/ec/kontron/kempld/kempld_internal.h | 5 |
5 files changed, 95 insertions, 1 deletions
diff --git a/src/ec/kontron/kempld/Makefile.inc b/src/ec/kontron/kempld/Makefile.inc index 0d5988625e..e7bafa39e7 100644 --- a/src/ec/kontron/kempld/Makefile.inc +++ b/src/ec/kontron/kempld/Makefile.inc @@ -2,3 +2,4 @@ bootblock-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += early_kempld.c ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld.c ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld_i2c.c +ramstage-$(CONFIG_EC_KONTRON_KEMPLD) += kempld_gpio.c diff --git a/src/ec/kontron/kempld/chip.h b/src/ec/kontron/kempld/chip.h index 30f40fe097..c44a103182 100644 --- a/src/ec/kontron/kempld/chip.h +++ b/src/ec/kontron/kempld/chip.h @@ -3,7 +3,15 @@ #ifndef EC_KONTRON_KEMPLD_CHIP_H #define EC_KONTRON_KEMPLD_CHIP_H -#define KEMPLD_NUM_UARTS 2 +#define KEMPLD_NUM_UARTS 2 +#define KEMPLD_NUM_GPIOS 16 + +enum kempld_gpio_mode { + KEMPLD_GPIO_DEFAULT = 0, + KEMPLD_GPIO_INPUT, + KEMPLD_GPIO_OUTPUT_LOW, + KEMPLD_GPIO_OUTPUT_HIGH, +}; enum kempld_uart_io { KEMPLD_UART_3F8 = 0, @@ -26,6 +34,7 @@ struct kempld_uart { struct ec_kontron_kempld_config { struct kempld_uart uart[KEMPLD_NUM_UARTS]; + enum kempld_gpio_mode gpio[KEMPLD_NUM_GPIOS]; unsigned short i2c_frequency; }; diff --git a/src/ec/kontron/kempld/kempld.c b/src/ec/kontron/kempld/kempld.c index f8371a8d82..0489bac042 100644 --- a/src/ec/kontron/kempld/kempld.c +++ b/src/ec/kontron/kempld/kempld.c @@ -93,6 +93,14 @@ static void kempld_enable_dev(struct device *const dev) printk(BIOS_WARNING, "KEMPLD: Spurious device %s.\n", dev_path(dev)); break; } + } else if (dev->path.type == DEVICE_PATH_GPIO) { + if (dev->path.gpio.id == 0) { + if (kempld_gpio_pads_config(dev) < 0) + printk(BIOS_ERR, "KEMPLD: GPIO configuration failed!\n"); + } else { + printk(BIOS_WARNING, "KEMPLD: Spurious GPIO device %s.\n", + dev_path(dev)); + } } } diff --git a/src/ec/kontron/kempld/kempld_gpio.c b/src/ec/kontron/kempld/kempld_gpio.c new file mode 100644 index 0000000000..8699c1f477 --- /dev/null +++ b/src/ec/kontron/kempld/kempld_gpio.c @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <stdint.h> +#include <arch/io.h> +#include <delay.h> +#include "chip.h" +#include "kempld.h" +#include "kempld_internal.h" + +enum kempld_gpio_direction { + KEMPLD_GPIO_DIR_IN = 0, + KEMPLD_GPIO_DIR_OUT = 1 +}; + +static void kempld_gpio_value_set(u8 pin_num, u8 value) +{ + const u8 mask = KEMPLD_GPIO_MASK(pin_num); + u8 reg_val = kempld_read8(KEMPLD_GPIO_LVL(pin_num)); + reg_val = value ? reg_val | mask : reg_val & ~mask; + kempld_write8(KEMPLD_GPIO_LVL(pin_num), reg_val); +} + +static void kempld_gpio_direction_set(u8 pin_num, enum kempld_gpio_direction dir) +{ + const u8 mask = KEMPLD_GPIO_MASK(pin_num); + u8 reg_val = kempld_read8(KEMPLD_GPIO_DIR(pin_num)); + reg_val = dir == KEMPLD_GPIO_DIR_OUT ? reg_val | mask : reg_val & ~mask; + kempld_write8(KEMPLD_GPIO_DIR(pin_num), reg_val); +} + +static int kempld_configure_gpio(u8 pin_num, enum kempld_gpio_mode mode) +{ + if (kempld_get_mutex(100) < 0) + return -1; + + switch (mode) { + case KEMPLD_GPIO_DEFAULT: + break; + + case KEMPLD_GPIO_INPUT: + kempld_gpio_direction_set(pin_num, KEMPLD_GPIO_DIR_IN); + break; + + case KEMPLD_GPIO_OUTPUT_LOW: + kempld_gpio_value_set(pin_num, 0); + kempld_gpio_direction_set(pin_num, KEMPLD_GPIO_DIR_OUT); + break; + + case KEMPLD_GPIO_OUTPUT_HIGH: + kempld_gpio_value_set(pin_num, 1); + kempld_gpio_direction_set(pin_num, KEMPLD_GPIO_DIR_OUT); + break; + } + + kempld_release_mutex(); + return 0; +} + +int kempld_gpio_pads_config(struct device *dev) +{ + const struct ec_kontron_kempld_config *config = dev->chip_info; + + if (!config) + return -1; + + for (u8 i = 0; i < KEMPLD_NUM_GPIOS; ++i) { + if (kempld_configure_gpio(i, config->gpio[i]) < 0) + return -1; + } + return 0; +} diff --git a/src/ec/kontron/kempld/kempld_internal.h b/src/ec/kontron/kempld/kempld_internal.h index 993fe8edd1..2c64f7946b 100644 --- a/src/ec/kontron/kempld/kempld_internal.h +++ b/src/ec/kontron/kempld/kempld_internal.h @@ -28,6 +28,11 @@ #define KEMPLD_CLK 33333333 /* 33MHz */ +#define KEMPLD_GPIO_MASK(pin_num) (1 << ((pin_num) % 8)) +#define KEMPLD_GPIO_DIR(pin_num) (0x40 + (pin_num) / 8) +#define KEMPLD_GPIO_LVL(pin_num) (0x42 + (pin_num) / 8) + void kempld_i2c_device_init(struct device *const dev); +int kempld_gpio_pads_config(struct device *dev); #endif /* EC_KONTRON_KEMPLD_INTERNAL_H */ |