| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2015 Google Inc. |
| * Copyright (C) 2015 Intel Corporation |
| * Copyright (C) 2017 Advanced Micro Devices, Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <arch/io.h> |
| #include <console/console.h> |
| #include <delay.h> |
| #include <gpio.h> |
| #include <soc/gpio.h> |
| #include <soc/pci_devs.h> |
| #include <soc/southbridge.h> |
| #include <assert.h> |
| |
| static const struct soc_amd_event gpio_event_table[] = { |
| { GPIO_1, GEVENT_19 }, |
| { GPIO_2, GEVENT_8 }, |
| { GPIO_3, GEVENT_2 }, |
| { GPIO_4, GEVENT_4 }, |
| { GPIO_5, GEVENT_7 }, |
| { GPIO_6, GEVENT_10 }, |
| { GPIO_7, GEVENT_11 }, |
| { GPIO_8, GEVENT_23 }, |
| { GPIO_9, GEVENT_22 }, |
| { GPIO_11, GEVENT_18 }, |
| { GPIO_13, GEVENT_21 }, |
| { GPIO_14, GEVENT_6 }, |
| { GPIO_15, GEVENT_20 }, |
| { GPIO_16, GEVENT_12 }, |
| { GPIO_17, GEVENT_13 }, |
| { GPIO_18, GEVENT_14 }, |
| { GPIO_21, GEVENT_5 }, |
| { GPIO_22, GEVENT_3 }, |
| { GPIO_23, GEVENT_16 }, |
| { GPIO_24, GEVENT_15 }, |
| { GPIO_65, GEVENT_0 }, |
| { GPIO_66, GEVENT_1 }, |
| { GPIO_68, GEVENT_9 }, |
| { GPIO_69, GEVENT_17 }, |
| }; |
| |
| static int get_gpio_gevent(uint8_t gpio) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(gpio_event_table); i++) { |
| if (gpio_event_table[i].gpio == gpio) |
| return (int)gpio_event_table[i].event; |
| } |
| return -1; |
| } |
| |
| static void mem_read_write32(uint32_t *address, uint32_t value, uint32_t mask) |
| { |
| uint32_t reg32; |
| |
| value &= mask; |
| reg32 = read32(address); |
| reg32 &= ~mask; |
| reg32 |= value; |
| write32(address, reg32); |
| } |
| |
| __weak void configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level) |
| { |
| printk(BIOS_WARNING, "Warning: SMI disabled!\n"); |
| } |
| |
| static void program_smi(uint32_t flag, int gevent_num) |
| { |
| uint32_t trigger; |
| |
| trigger = flag & FLAGS_TRIGGER_MASK; |
| /* |
| * Only level trigger is allowed for SMI. Trigger values are 0 |
| * through 3, with 0-1 being level trigger and 2-3 being edge |
| * trigger. GPIO_TRIGGER_EDGE_LOW is 2, so trigger has to be |
| * less than GPIO_TRIGGER_EDGE_LOW. |
| */ |
| assert(trigger < GPIO_TRIGGER_EDGE_LOW); |
| |
| if (trigger == GPIO_TRIGGER_LEVEL_HIGH) |
| configure_gevent_smi(gevent_num, SMI_MODE_SMI, |
| SMI_SCI_LVL_HIGH); |
| if (trigger == GPIO_TRIGGER_LEVEL_LOW) |
| configure_gevent_smi(gevent_num, SMI_MODE_SMI, |
| SMI_SCI_LVL_LOW); |
| } |
| |
| static void route_sci(uint8_t event) |
| { |
| smi_write8(SMI_SCI_MAP(event), event); |
| } |
| |
| static void get_sci_config_bits(uint32_t flag, uint32_t *edge, uint32_t *level) |
| { |
| uint32_t trigger; |
| |
| trigger = flag & FLAGS_TRIGGER_MASK; |
| switch (trigger) { |
| case GPIO_TRIGGER_LEVEL_LOW: |
| *edge = SCI_TRIGGER_LEVEL; |
| *level = 0; |
| break; |
| case GPIO_TRIGGER_LEVEL_HIGH: |
| *edge = SCI_TRIGGER_LEVEL; |
| *level = 1; |
| break; |
| case GPIO_TRIGGER_EDGE_LOW: |
| *edge = SCI_TRIGGER_EDGE; |
| *level = 0; |
| break; |
| case GPIO_TRIGGER_EDGE_HIGH: |
| *edge = SCI_TRIGGER_EDGE; |
| *level = 1; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| uintptr_t gpio_get_address(gpio_t gpio_num) |
| { |
| uintptr_t gpio_address; |
| |
| if (gpio_num < 64) |
| gpio_address = GPIO_BANK0_CONTROL(gpio_num); |
| else if (gpio_num < 128) |
| gpio_address = GPIO_BANK1_CONTROL(gpio_num); |
| else |
| gpio_address = GPIO_BANK2_CONTROL(gpio_num); |
| |
| return gpio_address; |
| } |
| |
| int gpio_get(gpio_t gpio_num) |
| { |
| uint32_t reg; |
| uintptr_t gpio_address = gpio_get_address(gpio_num); |
| |
| reg = read32((void *)gpio_address); |
| |
| return !!(reg & GPIO_PIN_STS); |
| } |
| |
| void gpio_set(gpio_t gpio_num, int value) |
| { |
| uint32_t reg; |
| uintptr_t gpio_address = gpio_get_address(gpio_num); |
| |
| reg = read32((void *)gpio_address); |
| reg &= ~GPIO_OUTPUT_MASK; |
| reg |= !!value << GPIO_OUTPUT_SHIFT; |
| write32((void *)gpio_address, reg); |
| } |
| |
| void gpio_input_pulldown(gpio_t gpio_num) |
| { |
| uint32_t reg; |
| uintptr_t gpio_address = gpio_get_address(gpio_num); |
| |
| reg = read32((void *)gpio_address); |
| reg &= ~GPIO_PULLUP_ENABLE; |
| reg |= GPIO_PULLDOWN_ENABLE; |
| write32((void *)gpio_address, reg); |
| } |
| |
| void gpio_input_pullup(gpio_t gpio_num) |
| { |
| uint32_t reg; |
| uintptr_t gpio_address = gpio_get_address(gpio_num); |
| |
| reg = read32((void *)gpio_address); |
| reg &= ~GPIO_PULLDOWN_ENABLE; |
| reg |= GPIO_PULLUP_ENABLE; |
| write32((void *)gpio_address, reg); |
| } |
| |
| void gpio_input(gpio_t gpio_num) |
| { |
| uint32_t reg; |
| uintptr_t gpio_address = gpio_get_address(gpio_num); |
| |
| reg = read32((void *)gpio_address); |
| reg &= ~GPIO_OUTPUT_ENABLE; |
| write32((void *)gpio_address, reg); |
| } |
| |
| void gpio_output(gpio_t gpio_num, int value) |
| { |
| uint32_t reg; |
| uintptr_t gpio_address = gpio_get_address(gpio_num); |
| |
| reg = read32((void *)gpio_address); |
| reg |= GPIO_OUTPUT_ENABLE; |
| write32((void *)gpio_address, reg); |
| gpio_set(gpio_num, value); |
| } |
| |
| const char *gpio_acpi_path(gpio_t gpio) |
| { |
| return "\\_SB.GPIO"; |
| } |
| |
| uint16_t gpio_acpi_pin(gpio_t gpio) |
| { |
| return gpio; |
| } |
| |
| void sb_program_gpios(const struct soc_amd_gpio *gpio_list_ptr, size_t size) |
| { |
| uint8_t *mux_ptr; |
| uint32_t *gpio_ptr, *inter_master; |
| uint32_t control, control_flags, edge_level, direction; |
| uint32_t mask, bit_edge, bit_level; |
| uint8_t mux, index, gpio; |
| int gevent_num; |
| |
| inter_master = (uint32_t *)(uintptr_t)(GPIO_CONTROL_MMIO_BASE |
| + GPIO_MASTER_SWITCH); |
| direction = 0; |
| edge_level = 0; |
| mask = 0; |
| |
| /* |
| * Disable blocking wake/interrupt status generation while updating |
| * debounce registers. Otherwise when a debounce register is updated |
| * the whole GPIO controller will zero out all interrupt enable status |
| * bits while the delay happens. This could cause us to drop the bits |
| * due to the read-modify-write that happens on each register. |
| * |
| * Additionally disable interrupt generation so we don't get any |
| * spurious interrupts while updating the registers. |
| */ |
| mem_read_write32(inter_master, 0, GPIO_MASK_STS_EN | GPIO_INTERRUPT_EN); |
| |
| for (index = 0; index < size; index++) { |
| gpio = gpio_list_ptr[index].gpio; |
| mux = gpio_list_ptr[index].function; |
| control = gpio_list_ptr[index].control; |
| control_flags = gpio_list_ptr[index].flags; |
| |
| mux_ptr = (uint8_t *)(uintptr_t)(gpio + GPIO_IOMUX_MMIO_BASE); |
| write8(mux_ptr, mux & AMD_GPIO_MUX_MASK); |
| read8(mux_ptr); /* Flush posted write */ |
| /* special case if pin 2 is assigned to wake */ |
| if ((gpio == 2) && !(mux & AMD_GPIO_MUX_MASK)) |
| route_sci(GPIO_2_EVENT); |
| gpio_ptr = (uint32_t *)gpio_get_address(gpio); |
| |
| if (control_flags & GPIO_SPECIAL_FLAG) { |
| gevent_num = get_gpio_gevent(gpio); |
| if (gevent_num < 0) { |
| printk(BIOS_WARNING, "Warning: GPIO pin %d has" |
| " no associated gevent!\n", gpio); |
| continue; |
| } |
| switch (control_flags & GPIO_SPECIAL_MASK) { |
| case GPIO_DEBOUNCE_FLAG: |
| mem_read_write32(gpio_ptr, control, |
| GPIO_DEBOUNCE_MASK); |
| break; |
| case GPIO_WAKE_FLAG: |
| mem_read_write32(gpio_ptr, control, |
| INT_WAKE_MASK); |
| break; |
| case GPIO_INT_FLAG: |
| mem_read_write32(gpio_ptr, control, |
| AMD_GPIO_CONTROL_MASK); |
| break; |
| case GPIO_SMI_FLAG: |
| mem_read_write32(gpio_ptr, control, |
| INT_SCI_SMI_MASK); |
| program_smi(control_flags, gevent_num); |
| break; |
| case GPIO_SCI_FLAG: |
| mem_read_write32(gpio_ptr, control, |
| INT_SCI_SMI_MASK); |
| get_sci_config_bits(control_flags, &bit_edge, |
| &bit_level); |
| edge_level |= bit_edge << gevent_num; |
| direction |= bit_level << gevent_num; |
| mask |= (1 << gevent_num); |
| route_sci(gevent_num); |
| break; |
| default: |
| printk(BIOS_WARNING, "Error, flags 0x%08x\n", |
| control_flags); |
| break; |
| } |
| } else { |
| mem_read_write32(gpio_ptr, control, |
| AMD_GPIO_CONTROL_MASK); |
| } |
| } |
| |
| /* |
| * Re-enable interrupt status generation. |
| * |
| * We leave MASK_STATUS disabled because the kernel may reconfigure the |
| * debounce registers while the drivers load. This will cause interrupts |
| * to be missed during boot. |
| */ |
| mem_read_write32(inter_master, GPIO_INTERRUPT_EN, GPIO_INTERRUPT_EN); |
| |
| /* Set all SCI trigger direction (high/low) */ |
| mem_read_write32((uint32_t *)(uintptr_t)(APU_SMI_BASE + SMI_SCI_TRIG), |
| direction, mask); |
| |
| /* Set all SCI trigger level (edge/level) */ |
| mem_read_write32((uint32_t *)(uintptr_t)(APU_SMI_BASE + SMI_SCI_LEVEL), |
| edge_level, mask); |
| } |
| |
| /* |
| * I2C pins are open drain with external pull up, so in order to bit bang them |
| * all, SCL pins must become GPIO inputs with no pull, then they need to be |
| * toggled between input-no-pull and output-low. This table is for the initial |
| * conversion of all SCL pins to input with no pull. |
| */ |
| static const struct soc_amd_gpio i2c_2_gpi[] = { |
| PAD_GPI(I2C0_SCL_PIN, PULL_NONE), |
| PAD_GPI(I2C1_SCL_PIN, PULL_NONE), |
| PAD_GPI(I2C2_SCL_PIN, PULL_NONE), |
| PAD_GPI(I2C3_SCL_PIN, PULL_NONE), |
| }; |
| #define saved_pins_count ARRAY_SIZE(i2c_2_gpi) |
| |
| /* |
| * To program I2C pins without destroying their programming, the registers |
| * that will be changed need to be saved first. |
| */ |
| static void save_i2c_pin_registers(uint8_t gpio, |
| struct soc_amd_i2c_save *save_table) |
| { |
| uint32_t *gpio_ptr; |
| uint8_t *mux_ptr; |
| |
| mux_ptr = (uint8_t *)(uintptr_t)(gpio + GPIO_IOMUX_MMIO_BASE); |
| gpio_ptr = (uint32_t *)gpio_get_address(gpio); |
| save_table->mux_value = read8(mux_ptr); |
| save_table->control_value = read32(gpio_ptr); |
| } |
| |
| static void restore_i2c_pin_registers(uint8_t gpio, |
| struct soc_amd_i2c_save *save_table) |
| { |
| uint32_t *gpio_ptr; |
| uint8_t *mux_ptr; |
| |
| mux_ptr = (uint8_t *)(uintptr_t)(gpio + GPIO_IOMUX_MMIO_BASE); |
| gpio_ptr = (uint32_t *)gpio_get_address(gpio); |
| write8(mux_ptr, save_table->mux_value); |
| read8(mux_ptr); |
| write32(gpio_ptr, save_table->control_value); |
| read32(gpio_ptr); |
| } |
| |
| /* Slaves to be reset are controlled by devicetree register i2c_scl_reset */ |
| void sb_reset_i2c_slaves(void) |
| { |
| const struct soc_amd_stoneyridge_config *cfg; |
| const struct device *dev = pcidev_path_on_root(GNB_DEVFN); |
| struct soc_amd_i2c_save save_table[saved_pins_count]; |
| uint8_t i, j, control; |
| |
| if (!dev || !dev->chip_info) |
| return; |
| cfg = dev->chip_info; |
| control = cfg->i2c_scl_reset & GPIO_I2C_MASK; |
| if (control == 0) |
| return; |
| |
| /* Save and reprogram I2C SCL pins */ |
| for (i = 0; i < saved_pins_count; i++) |
| save_i2c_pin_registers(i2c_2_gpi[i].gpio, &save_table[i]); |
| sb_program_gpios(i2c_2_gpi, saved_pins_count); |
| |
| /* |
| * Toggle SCL back and forth 9 times under 100KHz. A single read is |
| * needed after the writes to force the posted write to complete. |
| */ |
| for (j = 0; j < 9; j++) { |
| if (control & GPIO_I2C0_SCL) |
| write32((uint32_t *)GPIO_I2C0_ADDRESS, GPIO_SCL_LOW); |
| if (control & GPIO_I2C1_SCL) |
| write32((uint32_t *)GPIO_I2C1_ADDRESS, GPIO_SCL_LOW); |
| if (control & GPIO_I2C2_SCL) |
| write32((uint32_t *)GPIO_I2C2_ADDRESS, GPIO_SCL_LOW); |
| if (control & GPIO_I2C3_SCL) |
| write32((uint32_t *)GPIO_I2C3_ADDRESS, GPIO_SCL_LOW); |
| |
| read32((uint32_t *)GPIO_I2C3_ADDRESS); /* Flush posted write */ |
| udelay(4); /* 4usec gets 85KHz for 1 pin, 70KHz for 4 pins */ |
| |
| if (control & GPIO_I2C0_SCL) |
| write32((uint32_t *)GPIO_I2C0_ADDRESS, GPIO_SCL_HIGH); |
| if (control & GPIO_I2C1_SCL) |
| write32((uint32_t *)GPIO_I2C1_ADDRESS, GPIO_SCL_HIGH); |
| if (control & GPIO_I2C2_SCL) |
| write32((uint32_t *)GPIO_I2C2_ADDRESS, GPIO_SCL_HIGH); |
| if (control & GPIO_I2C3_SCL) |
| write32((uint32_t *)GPIO_I2C3_ADDRESS, GPIO_SCL_HIGH); |
| |
| read32((uint32_t *)GPIO_I2C3_ADDRESS); /* Flush posted write */ |
| udelay(4); |
| } |
| |
| /* Restore I2C pins. */ |
| for (i = 0; i < saved_pins_count; i++) |
| restore_i2c_pin_registers(i2c_2_gpi[i].gpio, &save_table[i]); |
| } |
| |
| int gpio_interrupt_status(gpio_t gpio) |
| { |
| uintptr_t gpio_address = gpio_get_address(gpio); |
| uint32_t reg = read32((void *)gpio_address); |
| |
| if (reg & GPIO_INT_STATUS) { |
| /* Clear interrupt status, preserve wake status */ |
| reg &= ~GPIO_WAKE_STATUS; |
| write32((void *)gpio_address, reg); |
| return 1; |
| } |
| |
| return 0; |
| } |