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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpigen.h>
#include <amdblocks/aoac.h>
#include <amdblocks/gpio.h>
#include <amdblocks/uart.h>
#include <device/device.h>
uintptr_t get_uart_base(unsigned int idx)
{
size_t num_ctrlrs;
const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs);
if (idx >= num_ctrlrs)
return 0;
return ctrlr[idx].base;
}
static enum cb_err get_uart_idx(uintptr_t base, const struct soc_uart_ctrlr_info *ctrlr,
size_t num_ctrlrs, unsigned int *idx)
{
unsigned int i;
for (i = 0; i < num_ctrlrs; i++) {
if (base == ctrlr[i].base) {
*idx = i;
return CB_SUCCESS;
}
}
return CB_ERR;
}
static enum cb_err get_uart_aoac_device(uintptr_t base, unsigned int *aoac_dev)
{
unsigned int idx;
size_t num_ctrlrs;
const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs);
if (get_uart_idx(base, ctrlr, num_ctrlrs, &idx) == CB_ERR)
return CB_ERR;
*aoac_dev = ctrlr[idx].aoac_device;
return CB_SUCCESS;
}
void set_uart_config(unsigned int idx)
{
size_t num_ctrlrs;
const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs);
if (idx >= num_ctrlrs)
return;
gpio_configure_pads(ctrlr[idx].mux, 2);
}
#if CONFIG(HAVE_ACPI_TABLES)
static const char *uart_acpi_name(const struct device *dev)
{
unsigned int idx;
size_t num_ctrlrs;
const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs);
if (get_uart_idx(dev->path.mmio.addr, ctrlr, num_ctrlrs, &idx) == CB_SUCCESS)
return ctrlr[idx].acpi_name;
else
return NULL;
}
/* This gets called for enabled devices only. */
static void uart_inject_ssdt(const struct device *dev)
{
acpigen_write_scope(acpi_device_path(dev));
acpigen_write_store_int_to_namestr(acpi_device_status(dev), "STAT");
acpigen_pop_len(); /* Scope */
}
#endif
/* 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;
if (get_uart_aoac_device(dev->path.mmio.addr, &dev_id) == CB_ERR) {
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_range(dev, 0, dev->path.mmio.addr, 4 * KiB);
}
struct device_operations amd_uart_mmio_ops = {
.read_resources = uart_read_resources,
.set_resources = noop_set_resources,
.scan_bus = scan_static_bus,
.enable = uart_enable,
#if CONFIG(HAVE_ACPI_TABLES)
.acpi_name = uart_acpi_name,
.acpi_fill_ssdt = uart_inject_ssdt,
#endif
};
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