diff options
Diffstat (limited to 'src/superio/common/ssdt.c')
| -rw-r--r-- | src/superio/common/ssdt.c | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/src/superio/common/ssdt.c b/src/superio/common/ssdt.c new file mode 100644 index 0000000000..035f06a71e --- /dev/null +++ b/src/superio/common/ssdt.c @@ -0,0 +1,247 @@ +/* + * This file is part of the coreboot project. + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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 <superio/common/ssdt.h> + +#include <device/device.h> +#include <device/pnp.h> +#include <arch/acpigen.h> +#include <arch/acpi.h> +#include <device/pnp_def.h> +#include <console/console.h> +#include <types.h> + +struct superio_dev { + const char *acpi_hid; + u16 io_base[4]; + u8 irq[2]; +}; + +static const struct superio_dev superio_devs[] = { + {ACPI_HID_FDC, {0x3f0, 0x3f2, 0x3f7}, {6, } }, + {ACPI_HID_KEYBOARD, {60, 64, }, {1, } }, + {ACPI_HID_MOUSE, {60, 64, }, {12, } }, + {ACPI_HID_COM, {0x3f8, 0x2f8, 0x3e8, 0x2e8}, {4, 3} }, + {ACPI_HID_LPT, {0x378, }, {7, } }, +}; + +static const u8 io_idx[] = {PNP_IDX_IO0, PNP_IDX_IO1, PNP_IDX_IO2, PNP_IDX_IO3}; +static const u8 irq_idx[] = {PNP_IDX_IRQ0, PNP_IDX_IRQ1}; + +static const struct superio_dev *superio_guess_function(struct device *dev) +{ + for (size_t i = 0; i < ARRAY_SIZE(io_idx); i++) { + struct resource *res = probe_resource(dev, io_idx[i]); + if (!res || !res->base) + continue; + + for (size_t j = 0; j < ARRAY_SIZE(superio_devs); j++) { + for (size_t k = 0; k < 4; k++) { + if (!superio_devs[j].io_base[k]) + continue; + if (superio_devs[j].io_base[k] == res->base) + return &superio_devs[j]; + } + } + } + for (size_t i = 0; i < ARRAY_SIZE(irq_idx); i++) { + struct resource *res = probe_resource(dev, irq_idx[i]); + if (!res || !res->size) + continue; + for (size_t j = 0; j < ARRAY_SIZE(superio_devs); j++) { + for (size_t k = 0; k < 2; k++) { + if (!superio_devs[j].irq[k]) + continue; + if (superio_devs[j].irq[k] == res->base) + return &superio_devs[j]; + } + } + } + return NULL; +} + +/* Return true if there are resources to report */ +static bool has_resources(struct device *dev) +{ + for (size_t i = 0; i < ARRAY_SIZE(io_idx); i++) { + struct resource *res = probe_resource(dev, io_idx[i]); + if (!res || !res->base || !res->size) + continue; + return 1; + } + for (size_t i = 0; i < ARRAY_SIZE(irq_idx); i++) { + struct resource *res = probe_resource(dev, irq_idx[i]); + if (!res || !res->size || res->base > 16) + continue; + return 1; + } + return 0; +} + +/* Add IO and IRQ resources for _CRS or _PRS */ +static void ldn_gen_resources(struct device *dev) +{ + uint16_t irq = 0; + for (size_t i = 0; i < ARRAY_SIZE(io_idx); i++) { + struct resource *res = probe_resource(dev, io_idx[i]); + if (!res || !res->base) + continue; + resource_t base = res->base; + resource_t size = res->size; + while (size > 0) { + resource_t sz = size > 255 ? 255 : size; + /* TODO: Needs test with regions >= 256 bytes */ + acpigen_write_io16(base, base, 1, sz, 1); + size -= sz; + base += sz; + } + } + for (size_t i = 0; i < ARRAY_SIZE(irq_idx); i++) { + struct resource *res = probe_resource(dev, irq_idx[i]); + if (!res || !res->size || res->base >= 16) + continue; + irq |= 1 << res->base; + } + if (irq) + acpigen_write_irq(irq); + +} + +/* Add resource base and size for additional SuperIO code */ +static void ldn_gen_resources_use(struct device *dev) +{ + char name[5]; + for (size_t i = 0; i < ARRAY_SIZE(io_idx); i++) { + struct resource *res = probe_resource(dev, io_idx[i]); + if (!res || !res->base || !res->size) + continue; + + snprintf(name, sizeof(name), "IO%XB", i); + name[4] = '\0'; + acpigen_write_name_integer(name, res->base); + + snprintf(name, sizeof(name), "IO%XS", i); + name[4] = '\0'; + acpigen_write_name_integer(name, res->size); + } +} + +const char *superio_common_ldn_acpi_name(const struct device *dev) +{ + u8 ldn = dev->path.pnp.device & 0xff; + u8 vldn = (dev->path.pnp.device >> 8) & 0x7; + static char name[5]; + + snprintf(name, sizeof(name), "L%02X%01X", ldn, vldn); + + name[4] = '\0'; + + return name; +} + +static const char *name_from_hid(const char *hid) +{ + static const struct { + const char *hid; + const char *name; + } lookup[] = { + {ACPI_HID_FDC, "FDC" }, + {ACPI_HID_KEYBOARD, "PS2 Keyboard" }, + {ACPI_HID_MOUSE, "PS2 Mouse"}, + {ACPI_HID_COM, "COM port" }, + {ACPI_HID_LPT, "LPT" }, + {ACPI_HID_PNP, "Generic PNP device" }, + }; + + for (size_t i = 0; hid && i < ARRAY_SIZE(lookup); i++) { + if (strcmp(hid, lookup[i].hid) == 0) + return lookup[i].name; + } + return "Generic device"; +} + +void superio_common_fill_ssdt_generator(struct device *dev) +{ + const char *scope = acpi_device_scope(dev); + const char *name = acpi_device_name(dev); + const u8 ldn = dev->path.pnp.device & 0xff; + const u8 vldn = (dev->path.pnp.device >> 8) & 0x7; + const char *hid; + + if (!scope || !name) { + printk(BIOS_ERR, "%s: Missing ACPI path/scope\n", dev_path(dev)); + return; + } + if (vldn) { + printk(BIOS_DEBUG, "%s: Ignoring virtual LDN\n", dev_path(dev)); + return; + } + + printk(BIOS_DEBUG, "%s.%s: %s\n", scope, name, dev_path(dev)); + + /* Scope */ + acpigen_write_scope(scope); + + /* Device */ + acpigen_write_device(name); + + acpigen_write_name_byte("_UID", 0); + acpigen_write_name_byte("LDN", ldn); + acpigen_write_name_byte("VLDN", vldn); + + acpigen_write_STA(dev->enabled ? 0xf : 0); + + if (!dev->enabled) { + acpigen_pop_len(); /* Device */ + acpigen_pop_len(); /* Scope */ + return; + } + + if (has_resources(dev)) { + /* Resources - _CRS */ + acpigen_write_name("_CRS"); + acpigen_write_resourcetemplate_header(); + ldn_gen_resources(dev); + acpigen_write_resourcetemplate_footer(); + + /* Resources - _PRS */ + acpigen_write_name("_PRS"); + acpigen_write_resourcetemplate_header(); + ldn_gen_resources(dev); + acpigen_write_resourcetemplate_footer(); + + /* Resources base and size for 3rd party ACPI code */ + ldn_gen_resources_use(dev); + } + + hid = acpi_device_hid(dev); + if (!hid) { + printk(BIOS_ERR, "%s: SuperIO driver doesn't provide a _HID\n", dev_path(dev)); + /* Try to guess it... */ + const struct superio_dev *sdev = superio_guess_function(dev); + if (sdev && sdev->acpi_hid) { + hid = sdev->acpi_hid; + printk(BIOS_WARNING, "%s: Guessed _HID is '%s'\n", dev_path(dev), hid); + } else { + hid = ACPI_HID_PNP; + printk(BIOS_ERR, "%s: Failed to guessed _HID\n", dev_path(dev)); + } + } + + acpigen_write_name_string("_HID", hid); + acpigen_write_name_string("_DDN", name_from_hid(hid)); + + acpigen_pop_len(); /* Device */ + acpigen_pop_len(); /* Scope */ +} |