kempld.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <device/device.h>
 
#include "chip.h"
#include "kempld.h"
#include "kempld_internal.h"
 
static void kempld_uart_read_resources(struct device *dev)
{
        static const unsigned int io_addr[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
 
        const struct ec_kontron_kempld_config *const config = dev->chip_info;
 
        struct resource *const res_io = new_resource(dev, 0);
        struct resource *const res_irq = new_resource(dev, 1);
        const unsigned int uart = dev->path.generic.subid;
 
        if (!config || !res_io || !res_irq || uart >= KEMPLD_NUM_UARTS)
                return;
 
        const enum kempld_uart_io io = config->uart[uart].io;
        if (io >= ARRAY_SIZE(io_addr)) {
                printk(BIOS_ERR, "KEMPLD: Bad io value '%d' for UART#%u\n.", io, uart);
                dev->enabled = false;
                return;
        }
 
        const int irq = config->uart[uart].irq;
        if (irq >= 16) {
                printk(BIOS_ERR, "KEMPLD: Bad irq value '%d' for UART#%u\n.", irq, uart);
                dev->enabled = false;
                return;
        }
 
        res_io->base = io_addr[io];
        res_io->size = 8;
        res_io->flags = IORESOURCE_IO | IORESOURCE_FIXED |
                        IORESOURCE_STORED | IORESOURCE_ASSIGNED;
        res_irq->base = irq;
        res_irq->size = 1;
        res_irq->flags = IORESOURCE_IO | IORESOURCE_FIXED |
                         IORESOURCE_STORED | IORESOURCE_ASSIGNED;
 
        if (kempld_get_mutex(100) < 0)
                return;
 
        const uint8_t reg = uart ? KEMPLD_UART_1 : KEMPLD_UART_0;
        const uint8_t val = kempld_read8(reg);
        kempld_write8(reg,
                           (val & ~(KEMPLD_UART_IO_MASK | KEMPLD_UART_IRQ_MASK)) |
                           io << KEMPLD_UART_IO_SHIFT |
                           irq << KEMPLD_UART_IRQ_SHIFT);
 
        kempld_release_mutex();
}
 
static void kempld_uart_enable_resources(struct device *dev)
{
        if (kempld_get_mutex(100) < 0)
                return;
 
        const unsigned int uart = dev->path.generic.subid;
        const uint8_t reg = uart ? KEMPLD_UART_1 : KEMPLD_UART_0;
        kempld_write8(reg, kempld_read8(reg) | KEMPLD_UART_ENABLE);
 
        kempld_release_mutex();
}
 
static struct device_operations kempld_uart_ops = {
        .read_resources   = kempld_uart_read_resources,
        .enable_resources = kempld_uart_enable_resources,
};
 
static void kempld_enable_dev(struct device *const dev)
{
        if (dev->path.type == DEVICE_PATH_GENERIC) {
                switch (dev->path.generic.id) {
                case 0:
                        if (dev->path.generic.subid < KEMPLD_NUM_UARTS) {
                                dev->ops = &kempld_uart_ops;
                                break;
                        }
                        __fallthrough;
                case 1:
                        if (dev->path.generic.subid == 0) {
                                kempld_i2c_device_init(dev);
                                break;
                        }
                        __fallthrough;
                default:
                        printk(BIOS_WARNING, "KEMPLD: Spurious device %s.\n", dev_path(dev));
                        break;
                }
        } else if (dev->path.type == DEVICE_PATH_GPIO) {
                if (dev->path.gpio.id == 0) {
                        if (kempld_gpio_pads_config(dev) < 0)
                                printk(BIOS_ERR, "KEMPLD: GPIO configuration failed!\n");
                } else {
                        printk(BIOS_WARNING, "KEMPLD: Spurious GPIO device %s.\n",
                               dev_path(dev));
                }
        }
}
 
struct chip_operations ec_kontron_kempld_ops = {
        CHIP_NAME("Kontron KEMPLD")
        .enable_dev = kempld_enable_dev,
};