soc/amd/stoneyridge: Move GPIO support to common

The banked GPIO functionality in the AcpiMmio block has been consistent
since the Mullins product.  Move the basic support into a common
directory.

Each product's pin availability, MUXes, and other details must remain
specific to the product.

The relocated source also drops the weak configure_gevent_smi() that
reports SMI is not available.  The stoneyridge port relies on SMI
to do its initialization, similar to modern soc/intel devices.  This
is the plan for future soc/amd ports, so make a missing function a
build error instead of a runtime warning.

BUG=b:131682806

Change-Id: I9cda00210a74de2bd1308ad43e2b867d24a67845
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32651
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

3 files changed, 324 insertions, 0 deletions

diff --git a/src/soc/amd/common/block/gpio_banks/Kconfig b/src/soc/amd/common/block/gpio_banks/Kconfig
new file mode 100644
index 0000000000..115aa2cc52
--- /dev/null
+++ b/src/soc/amd/common/block/gpio_banks/Kconfig
@@ -0,0 +1,8 @@
+config SOC_AMD_COMMON_BLOCK_BANKED_GPIOS
+	bool
+	depends on SOC_AMD_COMMON_BLOCK_ACPIMMIO
+	default n
+	help
+	  Select this option to use the newer style banks of GPIO signals.
+	  These are at offsets +0x1500, +0x1600, and +0x1700 from the AcpiMmio
+	  base.
diff --git a/src/soc/amd/common/block/gpio_banks/Makefile.inc b/src/soc/amd/common/block/gpio_banks/Makefile.inc
new file mode 100644
index 0000000000..f1555b12b8
--- /dev/null
+++ b/src/soc/amd/common/block/gpio_banks/Makefile.inc
@@ -0,0 +1,6 @@
+bootblock-$(CONFIG_SOC_AMD_COMMON_BLOCK_BANKED_GPIOS) += gpio.c
+verstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_BANKED_GPIOS) += gpio.c
+romstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_BANKED_GPIOS) += gpio.c
+postcar-$(CONFIG_SOC_AMD_COMMON_BLOCK_BANKED_GPIOS) += gpio.c
+ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_BANKED_GPIOS) += gpio.c
+smm-$(CONFIG_SOC_AMD_COMMON_BLOCK_BANKED_GPIOS) += gpio.c
diff --git a/src/soc/amd/common/block/gpio_banks/gpio.c b/src/soc/amd/common/block/gpio_banks/gpio.c
new file mode 100644
index 0000000000..17e3de09e3
--- /dev/null
+++ b/src/soc/amd/common/block/gpio_banks/gpio.c
@@ -0,0 +1,310 @@
+/*
+ * 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 <device/mmio.h>
+#include <device/device.h>
+#include <console/console.h>
+#include <gpio.h>
+#include <amdblocks/acpimmio.h>
+#include <soc/gpio.h>
+#include <soc/smi.h>
+#include <assert.h>
+
+static int get_gpio_gevent(uint8_t gpio, const struct soc_amd_event *table,
+				size_t items)
+{
+	int i;
+
+	for (i = 0; i < items; i++) {
+		if ((table + i)->gpio == gpio)
+			return (int)(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);
+}
+
+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 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;
+}
+
+__weak void soc_gpio_hook(uint8_t gpio, uint8_t mux) {}
+
+void program_gpios(const struct soc_amd_gpio *gpio_list_ptr, size_t size)
+{
+	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;
+	const struct soc_amd_event *gev_tbl;
+	size_t gev_items;
+
+	inter_master = (uint32_t *)(uintptr_t)(ACPIMMIO_GPIO0_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);
+
+	soc_get_gpio_event_table(&gev_tbl, &gev_items);
+
+	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;
+
+		iomux_write8(gpio, mux & AMD_GPIO_MUX_MASK);
+		iomux_read8(gpio); /* Flush posted write */
+
+		soc_gpio_hook(gpio, mux);
+
+		gpio_ptr = (uint32_t *)gpio_get_address(gpio);
+
+		if (control_flags & GPIO_SPECIAL_FLAG) {
+			gevent_num = get_gpio_gevent(gpio, gev_tbl, gev_items);
+			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);
+				soc_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)(ACPIMMIO_SMI_BASE + SMI_SCI_TRIG),
+					direction, mask);
+
+	/* Set all SCI trigger level (edge/level) */
+	mem_read_write32((uint32_t *)
+			(uintptr_t)(ACPIMMIO_SMI_BASE + SMI_SCI_LEVEL),
+					edge_level, mask);
+}
+
+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;
+}