conn.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <acpi/acpigen.h>
#include <boot/coreboot_tables.h>
#include <cbmem.h>
#include <console/console.h>
#include <intelblocks/acpi.h>
 
#include "chip.h"
 
/* Number of registered connectors */
static size_t total_conn_count;
 
static void conn_init(struct device *dev)
{
        total_conn_count++;
}
 
static unsigned int get_usb_port_number(const struct device *usb_port)
{
        return usb_port->path.usb.port_id + 1;
}
 
static struct type_c_info *conn_get_cbmem_buffer(void)
{
        struct type_c_info *info;
        size_t size;
 
        info = cbmem_find(CBMEM_ID_TYPE_C_INFO);
        if (info)
                return info;
 
        size = sizeof(struct type_c_info) + total_conn_count * sizeof(struct type_c_port_info);
        info = cbmem_add(CBMEM_ID_TYPE_C_INFO, size);
 
        if (!info)
                return NULL;
 
        memset(info, 0, size);
        return info;
}
 
static void conn_write_cbmem_entry(struct device *dev)
{
        const struct drivers_intel_pmc_mux_conn_config *config = dev->chip_info;
        struct type_c_port_info *port_info;
        struct type_c_info *info;
        size_t count;
 
        /*
         * Do not re-run this code on resume as the cbmem data is populated on boot-up
         * (non-S3 path) and stays intact across S3 suspend/resume.
         */
        if (acpi_is_wakeup_s3())
                return;
 
        info = conn_get_cbmem_buffer();
        if (!info || (info->port_count >= total_conn_count)) {
                printk(BIOS_ERR, "No space for Type-C port info!\n");
                return;
        }
 
        count = info->port_count;
        port_info = &info->port_info[count];
        port_info->usb2_port_number = get_usb_port_number(config->usb2_port);
        port_info->usb3_port_number = get_usb_port_number(config->usb3_port);
        port_info->sbu_orientation = config->sbu_orientation;
        port_info->data_orientation = config->hsl_orientation;
 
        printk(BIOS_INFO, "added type-c port%zu info to cbmem: usb2:%d usb3:%d sbu:%d data:%d\n",
                        count, port_info->usb2_port_number, port_info->usb3_port_number,
                        port_info->sbu_orientation, port_info->data_orientation);
 
        info->port_count++;
}
 
static const char *conn_acpi_name(const struct device *dev)
{
        static char name[5];
        snprintf(name, sizeof(name), "CON%1X", dev->path.generic.id);
        return name;
}
 
static const char *orientation_to_str(enum type_c_orientation ori)
{
        switch (ori) {
        case TYPEC_ORIENTATION_NORMAL:
                return "normal";
        case TYPEC_ORIENTATION_REVERSE:
                return "reverse";
        case TYPEC_ORIENTATION_NONE: /* Intentional fallthrough */
        default:
                return "";
        }
}
 
static void conn_fill_ssdt(const struct device *dev)
{
        struct drivers_intel_pmc_mux_conn_config *config = dev->chip_info;
        struct acpi_dp *dsd;
        const char *scope;
        const char *name;
 
        /* Reference the existing scope and write CONx device */
        scope = acpi_device_scope(dev);
        name = acpi_device_name(dev);
        if (!scope || !name)
                return;
 
        acpigen_write_scope(scope);
        acpigen_write_device(name);
 
        acpigen_write_name_integer("_ADR", dev->path.generic.id);
 
        /* _DSD, Device-Specific Data */
        dsd = acpi_dp_new_table("_DSD");
        acpi_dp_add_integer(dsd, "usb2-port-number", get_usb_port_number(config->usb2_port));
        acpi_dp_add_integer(dsd, "usb3-port-number", get_usb_port_number(config->usb3_port));
 
        /*
         * The kernel assumes that these Type-C signals (SBUs and HSLs) follow the CC lines,
         * unless they are explicitly called out otherwise.
         */
        if (config->sbu_orientation != TYPEC_ORIENTATION_NONE)
                acpi_dp_add_string(dsd, "sbu-orientation",
                                   orientation_to_str(config->sbu_orientation));
 
        if (config->hsl_orientation != TYPEC_ORIENTATION_NONE)
                acpi_dp_add_string(dsd, "hsl-orientation",
                                   orientation_to_str(config->hsl_orientation));
 
        acpi_dp_write(dsd);
 
        acpigen_pop_len(); /* CONx Device */
        acpigen_pop_len(); /* Scope */
 
        printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), dev->chip_ops->name,
               dev_path(dev));
}
 
static struct device_operations conn_dev_ops = {
        .read_resources = noop_read_resources,
        .set_resources  = noop_set_resources,
        .acpi_name      = conn_acpi_name,
        .acpi_fill_ssdt = conn_fill_ssdt,
        .init           = conn_init,
        .final          = conn_write_cbmem_entry,
};
 
static void conn_enable(struct device *dev)
{
        dev->ops = &conn_dev_ops;
}
 
struct chip_operations drivers_intel_pmc_mux_conn_ops = {
        CHIP_NAME("Intel PMC MUX CONN Driver")
        .enable_dev     = conn_enable,
};
 
bool intel_pmc_mux_conn_get_ports(const struct device *conn, unsigned int *usb2_port,
                                        unsigned int *usb3_port)
{
        const struct drivers_intel_pmc_mux_conn_config *mux_config;
 
        if (!conn->chip_info || conn->chip_ops != &drivers_intel_pmc_mux_conn_ops)
                return false;
 
        mux_config = conn->chip_info;
        *usb2_port = get_usb_port_number(mux_config->usb2_port);
        *usb3_port = get_usb_port_number(mux_config->usb3_port);
 
        return true;
};