uart.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <commonlib/helpers.h>
#include <device/device.h>
#include <device/mmio.h>
#include <amdblocks/gpio.h>
#include <amdblocks/aoac.h>
#include <amdblocks/uart.h>
#include <soc/aoac_defs.h>
#include <soc/southbridge.h>
#include <soc/gpio.h>
#include <soc/uart.h>
#include <types.h>
 
static const struct {
        uintptr_t base;
        struct soc_amd_gpio mux[2];
} uart_info[] = {
        [0] = { APU_UART0_BASE, {
                        PAD_NF(GPIO_138, UART0_TXD, PULL_NONE),
                        PAD_NF(GPIO_136, UART0_RXD, PULL_NONE),
        } },
        [1] = { APU_UART1_BASE, {
                        PAD_NF(GPIO_143, UART1_TXD, PULL_NONE),
                        PAD_NF(GPIO_141, UART1_RXD, PULL_NONE),
        } },
        [2] = { APU_UART2_BASE, {
                        PAD_NF(GPIO_137, UART2_TXD, PULL_NONE),
                        PAD_NF(GPIO_135, UART2_RXD, PULL_NONE),
        } },
        [3] = { APU_UART3_BASE, {
                        PAD_NF(GPIO_140, UART3_TXD, PULL_NONE),
                        PAD_NF(GPIO_142, UART3_RXD, PULL_NONE),
        } },
};
 
uintptr_t get_uart_base(unsigned int idx)
{
        if (idx >= ARRAY_SIZE(uart_info))
                return 0;
 
        return uart_info[idx].base;
}
 
void clear_uart_legacy_config(void)
{
        write16((void *)FCH_LEGACY_UART_DECODE, 0);
}
 
void set_uart_config(unsigned int idx)
{
        if (idx >= ARRAY_SIZE(uart_info))
                return;
 
        gpio_configure_pads(uart_info[idx].mux, 2);
}
 
static const char *uart_acpi_name(const struct device *dev)
{
        switch (dev->path.mmio.addr) {
        case APU_UART0_BASE:
                return "FUR0";
        case APU_UART1_BASE:
                return "FUR1";
        case APU_UART2_BASE:
                return "FUR2";
        case APU_UART3_BASE:
                return "FUR3";
        default:
                return NULL;
        }
}
 
/* Even though this is called enable, it gets called for both enabled and disabled devices. */
static void uart_enable(struct device *dev)
{
        unsigned int dev_id;
 
        switch (dev->path.mmio.addr) {
        case APU_UART0_BASE:
                dev_id = FCH_AOAC_DEV_UART0;
                break;
        case APU_UART1_BASE:
                dev_id = FCH_AOAC_DEV_UART1;
                break;
        case APU_UART2_BASE:
                dev_id = FCH_AOAC_DEV_UART2;
                break;
        case APU_UART3_BASE:
                dev_id = FCH_AOAC_DEV_UART3;
                break;
        default:
                printk(BIOS_ERR, "%s: Unknown device: %s\n", __func__, dev_path(dev));
                return;
        }
 
        if (dev->enabled) {
                power_on_aoac_device(dev_id);
                wait_for_aoac_enabled(dev_id);
        } else {
                power_off_aoac_device(dev_id);
        }
}
 
static void uart_read_resources(struct device *dev)
{
        mmio_resource(dev, 0, dev->path.mmio.addr / KiB, 4);
}
 
struct device_operations picasso_uart_mmio_ops = {
        .read_resources = uart_read_resources,
        .set_resources = noop_set_resources,
        .scan_bus = scan_static_bus,
        .acpi_name = uart_acpi_name,
        .enable = uart_enable,
        .acpi_fill_ssdt = uart_inject_ssdt,
};