| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include "pci_xhci.h" |
| #include <acpi/acpigen.h> |
| #include <acpi/acpigen_pci.h> |
| #include <console/console.h> |
| #include <device/pci.h> |
| #include <device/pci_ids.h> |
| #include <device/xhci.h> |
| #include <stdlib.h> |
| |
| #define PCI_XHCI_CLASSCODE 0x0c0330 /* USB3.0 xHCI controller */ |
| |
| static unsigned int controller_count; |
| const struct device_operations xhci_pci_ops; |
| |
| struct port_counts { |
| unsigned int high_speed; |
| unsigned int super_speed; |
| }; |
| |
| __weak enum cb_err pci_xhci_get_wake_gpe(const struct device *dev, int *gpe) |
| { |
| *gpe = -1; |
| return CB_SUCCESS; |
| } |
| |
| static void xhci_count_ports(void *context, const struct xhci_supported_protocol *data) |
| { |
| struct port_counts *counts = context; |
| |
| switch (data->major_rev) { |
| case 3: |
| counts->super_speed += data->port_count; |
| return; |
| case 2: |
| counts->high_speed += data->port_count; |
| return; |
| default: |
| printk(BIOS_INFO, "%s: Unknown USB Version: %#x\n", __func__, data->major_rev); |
| return; |
| } |
| } |
| |
| static bool xhci_port_exists(const struct device *dev, const struct usb_path *path) |
| { |
| /* Cache the counts so we don't have to iterate on each invocation. */ |
| static struct { |
| const struct device *dev; |
| struct port_counts counts; |
| } cache; |
| |
| if (cache.dev != dev) { |
| cache.counts.high_speed = 0; |
| cache.counts.super_speed = 0; |
| cache.dev = dev; |
| |
| xhci_for_each_supported_usb_cap(dev, &cache.counts, xhci_count_ports); |
| } |
| |
| /* port_ids are 0 based */ |
| switch (path->port_type) { |
| case 3: |
| return path->port_id < cache.counts.super_speed; |
| case 2: |
| return path->port_id < cache.counts.high_speed; |
| default: |
| printk(BIOS_INFO, "%s: Unknown USB Version: %#x\n", __func__, path->port_type); |
| return false; |
| } |
| } |
| |
| static const struct device *get_xhci_dev(const struct device *dev) |
| { |
| while (dev && dev->ops != &xhci_pci_ops) { |
| if (dev->path.type == DEVICE_PATH_ROOT) |
| return NULL; |
| |
| dev = dev->bus->dev; |
| } |
| |
| return dev; |
| } |
| |
| static const char *xhci_acpi_name(const struct device *dev) |
| { |
| char *name; |
| unsigned int port_id; |
| const char *pattern; |
| const struct device *xhci_dev; |
| |
| /* Generate ACPI names for the usb_acpi driver */ |
| if (dev->path.type == DEVICE_PATH_USB) { |
| /* Ports index start at 1 */ |
| port_id = dev->path.usb.port_id + 1; |
| |
| switch (dev->path.usb.port_type) { |
| case 0: |
| return "RHUB"; |
| case 2: |
| pattern = "HS%02d"; |
| break; |
| case 3: |
| pattern = "SS%02d"; |
| break; |
| default: |
| printk(BIOS_INFO, "%s: Unknown USB Version: %#x\n", __func__, |
| dev->path.usb.port_type); |
| return NULL; |
| } |
| |
| xhci_dev = get_xhci_dev(dev); |
| if (!xhci_dev) |
| die("%s: xHCI controller not found for %s\n", __func__, dev_path(dev)); |
| |
| /* |
| * We only want to return an ACPI name for a USB port if the controller |
| * physically has the port. This has the desired side effect of making the |
| * usb_acpi driver skip generating an ACPI node for a device which has |
| * no port. This prevents writing an invalid SSDT table which the OS then |
| * complains about. |
| */ |
| if (!xhci_port_exists(xhci_dev, &dev->path.usb)) { |
| printk(BIOS_WARNING, "%s: %s does not exist on xHC ", __func__, |
| dev_path(dev)); |
| /* dev_path uses a static buffer :( */ |
| printk(BIOS_WARNING, "%s\n", dev_path(xhci_dev)); |
| |
| return NULL; |
| } |
| |
| name = malloc(ACPI_NAME_BUFFER_SIZE); |
| snprintf(name, ACPI_NAME_BUFFER_SIZE, pattern, port_id); |
| name[4] = '\0'; |
| |
| return name; |
| } else if (dev->ops == &xhci_pci_ops) { |
| return dev->name; |
| } |
| |
| printk(BIOS_ERR, "%s: Unknown device %s\n", __func__, dev_path(dev)); |
| |
| return NULL; |
| } |
| |
| static void xhci_generate_port_acpi(void *context, const struct xhci_supported_protocol *data) |
| { |
| const char *format; |
| char buf[16]; |
| struct port_counts *counts = context; |
| unsigned int *dev_num; |
| |
| xhci_print_supported_protocol(data); |
| |
| if (data->major_rev == 3) { |
| format = "SS%02d"; |
| dev_num = &counts->super_speed; |
| } else if (data->major_rev == 2) { |
| format = "HS%02d"; |
| dev_num = &counts->high_speed; |
| } else { |
| printk(BIOS_INFO, "%s: Unknown USB Version: %#x\n", __func__, data->major_rev); |
| return; |
| } |
| |
| for (unsigned int i = 0; i < data->port_count; ++i) { |
| snprintf(buf, sizeof(buf), format, ++(*dev_num)); |
| acpigen_write_device(buf); |
| acpigen_write_name_byte("_ADR", data->port_offset + i); |
| acpigen_pop_len(); |
| } |
| } |
| |
| static void xhci_add_devices(const struct device *dev) |
| { |
| /* Used by the callback to track how many ports have been seen. */ |
| struct port_counts counts = {0, 0}; |
| |
| acpigen_write_device("RHUB"); |
| acpigen_write_name_integer("_ADR", 0x00000000); |
| |
| xhci_for_each_supported_usb_cap(dev, &counts, xhci_generate_port_acpi); |
| |
| acpigen_pop_len(); |
| } |
| |
| static void xhci_fill_ssdt(const struct device *dev) |
| { |
| int gpe; |
| const char *scope = acpi_device_scope(dev); |
| const char *name = acpi_device_name(dev); |
| |
| if (!scope || !name) |
| return; |
| |
| printk(BIOS_DEBUG, "xHCI SSDT generation\n"); |
| |
| acpigen_write_scope(scope); |
| acpigen_write_device(name); |
| |
| acpigen_write_ADR_pci_device(dev); |
| acpigen_write_name_string("_DDN", "xHC - Extensible Host Controller"); |
| acpigen_write_STA(acpi_device_status(dev)); |
| |
| if (pci_xhci_get_wake_gpe(dev, &gpe) == CB_SUCCESS) { |
| printk(BIOS_DEBUG, "%s: Got GPE %d for %s\n", __func__, gpe, dev_path(dev)); |
| } else { |
| printk(BIOS_ERR, "%s: Error getting GPE for : %s\n", __func__, dev_path(dev)); |
| gpe = -1; |
| } |
| |
| if (gpe > 0) { |
| acpigen_write_PRW(gpe, SLP_TYP_S3); |
| acpigen_write_name_integer("_S0W", ACPI_DEVICE_SLEEP_D0); |
| acpigen_write_name_integer("_S3W", ACPI_DEVICE_SLEEP_D3_COLD); |
| acpigen_write_name_integer("_S4W", ACPI_DEVICE_SLEEP_D3_COLD); |
| } |
| |
| xhci_add_devices(dev); |
| |
| acpigen_pop_len(); |
| acpigen_pop_len(); |
| } |
| |
| static void xhci_enable(struct device *dev) |
| { |
| char *name; |
| uint32_t class = pci_read_config32(dev, PCI_CLASS_REVISION); |
| /* Class code, the upper 3 bytes of PCI_CLASS_REVISION. */ |
| class >>= 8; |
| |
| if (class != PCI_XHCI_CLASSCODE) { |
| printk(BIOS_ERR, "Incorrect xHCI class code: %#x\n", class); |
| dev->enabled = 0; |
| return; |
| } |
| |
| name = malloc(ACPI_NAME_BUFFER_SIZE); |
| snprintf(name, ACPI_NAME_BUFFER_SIZE, "XHC%d", controller_count++); |
| dev->name = name; |
| } |
| |
| const struct device_operations xhci_pci_ops = { |
| .read_resources = pci_dev_read_resources, |
| .set_resources = pci_dev_set_resources, |
| .enable_resources = pci_dev_enable_resources, |
| .init = pci_dev_init, |
| .scan_bus = scan_static_bus, |
| .enable = xhci_enable, |
| .ops_pci = &pci_dev_ops_pci, |
| .acpi_fill_ssdt = xhci_fill_ssdt, |
| .acpi_name = xhci_acpi_name, |
| }; |