dock.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <device/device.h>
#include <arch/io.h>
#include <delay.h>
#include "dock.h"
#include <superio/nsc/pc87384/pc87384.h>
#include "ec/acpi/ec.h"
#include "ec/lenovo/pmh7/pmh7.h"
#include <southbridge/intel/i82801gx/i82801gx.h>
 
#define DLPC_CONTROL 0x164c
 
static void dlpc_write_register(int reg, int value)
{
        outb(reg, 0x164e);
        outb(value, 0x164f);
}
 
static u8 dlpc_read_register(int reg)
{
        outb(reg, 0x164e);
        return inb(0x164f);
}
 
static void dock_write_register(int reg, int value)
{
        outb(reg, 0x2e);
        outb(value, 0x2f);
}
 
static u8 dock_read_register(int reg)
{
        outb(reg, 0x2e);
        return inb(0x2f);
}
 
static void dlpc_gpio_set_mode(int port, int mode)
{
        dlpc_write_register(0xf0, port);
        dlpc_write_register(0xf1, mode);
}
 
static void dock_gpio_set_mode(int port, int mode, int irq)
{
        dock_write_register(0xf0, port);
        dock_write_register(0xf1, mode);
        dock_write_register(0xf2, irq);
}
 
static void dlpc_gpio_init(void)
{
        /* Select GPIO module */
        dlpc_write_register(0x07, 0x07);
        /* GPIO Base Address 0x1680 */
        dlpc_write_register(0x60, 0x16);
        dlpc_write_register(0x61, 0x80);
 
        /* Activate GPIO */
        dlpc_write_register(0x30, 0x01);
 
        dlpc_gpio_set_mode(0x00, 3);
        dlpc_gpio_set_mode(0x01, 3);
        dlpc_gpio_set_mode(0x02, 0);
        dlpc_gpio_set_mode(0x03, 3);
        dlpc_gpio_set_mode(0x04, 4);
        dlpc_gpio_set_mode(0x20, 4);
        dlpc_gpio_set_mode(0x21, 4);
        dlpc_gpio_set_mode(0x23, 4);
}
 
int dlpc_init(void)
{
        int timeout = 1000;
 
        /* Enable 14.318MHz CLK on CLKIN */
        dlpc_write_register(0x29, 0xa0);
        while (!(dlpc_read_register(0x29) & 0x10) && timeout--)
                udelay(1000);
 
        if (!timeout)
                return 1;
 
        /* Select DLPC module */
        dlpc_write_register(0x07, 0x19);
        /* DLPC Base Address */
        dlpc_write_register(0x60, (DLPC_CONTROL >> 8) & 0xff);
        dlpc_write_register(0x61, DLPC_CONTROL & 0xff);
        /* Activate DLPC */
        dlpc_write_register(0x30, 0x01);
 
        /* Reset docking state */
        outb(0x00, DLPC_CONTROL);
 
        dlpc_gpio_init();
        return 0;
}
 
static int dock_superio_init(void)
{
        int timeout = 1000;
        /* startup 14.318MHz Clock */
        dock_write_register(0x29, 0xa0);
        /* wait until clock is settled */
        while (!(dock_read_register(0x29) & 0x10) && timeout--)
                udelay(1000);
 
        if (!timeout)
                return 1;
 
        /* set GPIO pins to Serial/Parallel Port
         * functions
         */
        dock_write_register(0x22, 0xa9);
 
        /* enable serial port */
        dock_write_register(0x07, PC87384_SP1);
        dock_write_register(0x30, 0x01);
 
        dock_write_register(0x07, PC87384_GPIO);
        dock_write_register(0x60, 0x16);
        dock_write_register(0x61, 0x20);
        /* enable GPIO */
        dock_write_register(0x30, 0x01);
 
        dock_gpio_set_mode(0x00, PC87384_GPIO_PIN_DEBOUNCE |
                           PC87384_GPIO_PIN_PULLUP, 0x00);
 
        dock_gpio_set_mode(0x01, PC87384_GPIO_PIN_TYPE_PUSH_PULL |
                           PC87384_GPIO_PIN_OE, 0x00);
 
        dock_gpio_set_mode(0x02, PC87384_GPIO_PIN_TYPE_PUSH_PULL |
                           PC87384_GPIO_PIN_OE, 0x00);
 
        dock_gpio_set_mode(0x03, PC87384_GPIO_PIN_DEBOUNCE |
                           PC87384_GPIO_PIN_PULLUP, 0x00);
 
        dock_gpio_set_mode(0x04, PC87384_GPIO_PIN_DEBOUNCE |
                           PC87384_GPIO_PIN_PULLUP, 0x00);
 
        dock_gpio_set_mode(0x05, PC87384_GPIO_PIN_DEBOUNCE |
                           PC87384_GPIO_PIN_PULLUP, 0x00);
 
        dock_gpio_set_mode(0x06, PC87384_GPIO_PIN_DEBOUNCE |
                           PC87384_GPIO_PIN_PULLUP, 0x00);
 
        dock_gpio_set_mode(0x07, PC87384_GPIO_PIN_DEBOUNCE |
                           PC87384_GPIO_PIN_PULLUP, 0x00);
 
        /* no GPIO events enabled for PORT0 */
        outb(0x00, 0x1622);
        /* clear GPIO events on PORT0 */
        outb(0xff, 0x1623);
        outb(0xff, 0x1624);
        /* no GPIO events enabled for PORT1 */
        outb(0x00, 0x1626);
 
        /* clear GPIO events on PORT1*/
        outb(0xff, 0x1627);
        outb(0x1F, 0x1628);
        outb(0xfd, 0x1620);
        return 0;
}
 
int dock_connect(void)
{
        int timeout = 1000;
 
        outb(0x07, DLPC_CONTROL);
 
        timeout = 1000;
 
        while (!(inb(DLPC_CONTROL) & 8) && timeout--)
                udelay(1000);
 
        if (!timeout) {
                /* docking failed, disable DLPC switch */
                outb(0x00, DLPC_CONTROL);
                dlpc_write_register(0x30, 0x00);
                return 1;
        }
 
        /* Assert D_PLTRST# */
        outb(0xfe, 0x1680);
        udelay(1000);
        /* Deassert D_PLTRST# */
        outb(0xff, 0x1680);
        udelay(10000);
 
        return dock_superio_init();
}
 
void dock_disconnect(void)
{
        /* disconnect LPC bus */
        outb(0x00, DLPC_CONTROL);
        /* Assert PLTRST and DLPCPD */
        outb(0xfc, 0x1680);
}
 
int dock_present(void)
{
        return pmh7_register_read(0x61) & 1;
}
 
int legacy_io_present(void)
{
        return !(inb(DEFAULT_GPIOBASE + 0x0c) & 0x40);
}
 
void legacy_io_init(void)
{
        /* Enable Power for Ultrabay slot */
        pmh7_ultrabay_power_enable(1);
        udelay(100000);
        dock_superio_init();
}