/*
 * arch/arm/mach-orion5x/dns323-setup.c
 *
 * Copyright (C) 2007 Herbert Valerio Riedel <hvr@gnu.org>
 *
 * Support for HW Rev C1:
 *
 * Copyright (C) 2010 Benjamin Herrenschmidt <benh@kernel.crashing.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 */
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <linux/irq.h>
#include <linux/mtd/physmap.h>
#include <linux/mv643xx_eth.h>
#include <linux/leds.h>
#include <linux/gpio_keys.h>
#include <linux/input.h>
#include <linux/i2c.h>
#include <linux/ata_platform.h>
#include <linux/phy.h>
#include <linux/marvell_phy.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/pci.h>
#include <asm/system_info.h>
#include <mach/orion5x.h>
#include <plat/orion-gpio.h>
#include "common.h"
#include "mpp.h"

/* Rev A1 and B1 */
#define DNS323_GPIO_LED_RIGHT_AMBER     1
#define DNS323_GPIO_LED_LEFT_AMBER      2
#define DNS323_GPIO_SYSTEM_UP           3
#define DNS323_GPIO_LED_POWER1          4
#define DNS323_GPIO_LED_POWER2          5
#define DNS323_GPIO_OVERTEMP            6
#define DNS323_GPIO_RTC                 7
#define DNS323_GPIO_POWER_OFF           8
#define DNS323_GPIO_KEY_POWER           9
#define DNS323_GPIO_KEY_RESET           10

/* Rev C1 */
#define DNS323C_GPIO_KEY_POWER          1
#define DNS323C_GPIO_POWER_OFF          2
#define DNS323C_GPIO_LED_RIGHT_AMBER    8
#define DNS323C_GPIO_LED_LEFT_AMBER     9
#define DNS323C_GPIO_LED_POWER          17
#define DNS323C_GPIO_FAN_BIT1           18
#define DNS323C_GPIO_FAN_BIT0           19

/* Exposed to userspace, do not change */
enum {
        DNS323_REV_A1,  /* 0 */
        DNS323_REV_B1,  /* 1 */
        DNS323_REV_C1,  /* 2 */
};


/****************************************************************************
 * PCI setup
 */

static int __init dns323_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
        int irq;

        /*
         * Check for devices with hard-wired IRQs.
         */
        irq = orion5x_pci_map_irq(dev, slot, pin);
        if (irq != -1)
                return irq;

        return -1;
}

static struct hw_pci dns323_pci __initdata = {
        .nr_controllers = 2,
        .setup          = orion5x_pci_sys_setup,
        .scan           = orion5x_pci_sys_scan_bus,
        .map_irq        = dns323_pci_map_irq,
};

static int __init dns323_pci_init(void)
{
        /* Rev B1 and C1 doesn't really use its PCI bus, and initialising PCI
         * gets in the way of initialising the SATA controller.
         */
        if (machine_is_dns323() && system_rev == DNS323_REV_A1)
                pci_common_init(&dns323_pci);

        return 0;
}

subsys_initcall(dns323_pci_init);

/****************************************************************************
 * 8MiB NOR flash (Spansion S29GL064M90TFIR4)
 *
 * Layout as used by D-Link:
 *  0x00000000-0x00010000 : "MTD1"
 *  0x00010000-0x00020000 : "MTD2"
 *  0x00020000-0x001a0000 : "Linux Kernel"
 *  0x001a0000-0x007d0000 : "File System"
 *  0x007d0000-0x00800000 : "u-boot"
 */

#define DNS323_NOR_BOOT_BASE 0xf4000000
#define DNS323_NOR_BOOT_SIZE SZ_8M

static struct mtd_partition dns323_partitions[] = {
        {
                .name   = "MTD1",
                .size   = 0x00010000,
                .offset = 0,
        }, {
                .name   = "MTD2",
                .size   = 0x00010000,
                .offset = 0x00010000,
        }, {
                .name   = "Linux Kernel",
                .size   = 0x00180000,
                .offset = 0x00020000,
        }, {
                .name   = "File System",
                .size   = 0x00630000,
                .offset = 0x001A0000,
        }, {
                .name   = "u-boot",
                .size   = 0x00030000,
                .offset = 0x007d0000,
        },
};

static struct physmap_flash_data dns323_nor_flash_data = {
        .width          = 1,
        .parts          = dns323_partitions,
        .nr_parts       = ARRAY_SIZE(dns323_partitions)
};

static struct resource dns323_nor_flash_resource = {
        .flags          = IORESOURCE_MEM,
        .start          = DNS323_NOR_BOOT_BASE,
        .end            = DNS323_NOR_BOOT_BASE + DNS323_NOR_BOOT_SIZE - 1,
};

static struct platform_device dns323_nor_flash = {
        .name           = "physmap-flash",
        .id             = 0,
        .dev            = {
                .platform_data  = &dns323_nor_flash_data,
        },
        .resource       = &dns323_nor_flash_resource,
        .num_resources  = 1,
};

/****************************************************************************
 * Ethernet
 */

static struct mv643xx_eth_platform_data dns323_eth_data = {
        .phy_addr = MV643XX_ETH_PHY_ADDR(8),
};

/* dns323_parse_hex_*() taken from tsx09-common.c; should a common copy of these
 * functions be kept somewhere?
 */
static int __init dns323_parse_hex_nibble(char n)
{
        if (n >= '0' && n <= '9')
                return n - '0';

        if (n >= 'A' && n <= 'F')
                return n - 'A' + 10;

        if (n >= 'a' && n <= 'f')
                return n - 'a' + 10;

        return -1;
}

static int __init dns323_parse_hex_byte(const char *b)
{
        int hi;
        int lo;

        hi = dns323_parse_hex_nibble(b[0]);
        lo = dns323_parse_hex_nibble(b[1]);

        if (hi < 0 || lo < 0)
                return -1;

        return (hi << 4) | lo;
}

static int __init dns323_read_mac_addr(void)
{
        u_int8_t addr[6];
        int i;
        char *mac_page;

        /* MAC address is stored as a regular ol' string in /dev/mtdblock4
         * (0x007d0000-0x00800000) starting at offset 196480 (0x2ff80).
         */
        mac_page = ioremap(DNS323_NOR_BOOT_BASE + 0x7d0000 + 196480, 1024);
        if (!mac_page)
                return -ENOMEM;

        /* Sanity check the string we're looking at */
        for (i = 0; i < 5; i++) {
                if (*(mac_page + (i * 3) + 2) != ':') {
                        goto error_fail;
                }
        }

        for (i = 0; i < 6; i++) {
                int byte;

                byte = dns323_parse_hex_byte(mac_page + (i * 3));
                if (byte < 0) {
                        goto error_fail;
                }

                addr[i] = byte;
        }

        iounmap(mac_page);
        printk("DNS-323: Found ethernet MAC address: ");
        for (i = 0; i < 6; i++)
                printk("%.2x%s", addr[i], (i < 5) ? ":" : ".\n");

        memcpy(dns323_eth_data.mac_addr, addr, 6);

        return 0;

error_fail:
        iounmap(mac_page);
        return -EINVAL;
}

/****************************************************************************
 * GPIO LEDs (simple - doesn't use hardware blinking support)
 */

static struct gpio_led dns323ab_leds[] = {
        {
                .name = "power:blue",
                .gpio = DNS323_GPIO_LED_POWER2,
                .default_trigger = "default-on",
        }, {
                .name = "right:amber",
                .gpio = DNS323_GPIO_LED_RIGHT_AMBER,
                .active_low = 1,
        }, {
                .name = "left:amber",
                .gpio = DNS323_GPIO_LED_LEFT_AMBER,
                .active_low = 1,
        },
};


static struct gpio_led dns323c_leds[] = {
        {
                .name = "power:blue",
                .gpio = DNS323C_GPIO_LED_POWER,
                .default_trigger = "timer",
                .active_low = 1,
        }, {
                .name = "right:amber",
                .gpio = DNS323C_GPIO_LED_RIGHT_AMBER,
                .active_low = 1,
        }, {
                .name = "left:amber",
                .gpio = DNS323C_GPIO_LED_LEFT_AMBER,
                .active_low = 1,
        },
};


static struct gpio_led_platform_data dns323ab_led_data = {
        .num_leds       = ARRAY_SIZE(dns323ab_leds),
        .leds           = dns323ab_leds,
        .gpio_blink_set = orion_gpio_led_blink_set,
};

static struct gpio_led_platform_data dns323c_led_data = {
        .num_leds       = ARRAY_SIZE(dns323c_leds),
        .leds           = dns323c_leds,
        .gpio_blink_set = orion_gpio_led_blink_set,
};

static struct platform_device dns323_gpio_leds = {
        .name           = "leds-gpio",
        .id             = -1,
        .dev            = {
                .platform_data  = &dns323ab_led_data,
        },
};

/****************************************************************************
 * GPIO Attached Keys
 */

static struct gpio_keys_button dns323ab_buttons[] = {
        {
                .code           = KEY_RESTART,
                .gpio           = DNS323_GPIO_KEY_RESET,
                .desc           = "Reset Button",
                .active_low     = 1,
        }, {
                .code           = KEY_POWER,
                .gpio           = DNS323_GPIO_KEY_POWER,
                .desc           = "Power Button",
                .active_low     = 1,
        },
};

static struct gpio_keys_platform_data dns323ab_button_data = {
        .buttons        = dns323ab_buttons,
        .nbuttons       = ARRAY_SIZE(dns323ab_buttons),
};

static struct gpio_keys_button dns323c_buttons[] = {
        {
                .code           = KEY_POWER,
                .gpio           = DNS323C_GPIO_KEY_POWER,
                .desc           = "Power Button",
                .active_low     = 1,
        },
};

static struct gpio_keys_platform_data dns323c_button_data = {
        .buttons        = dns323c_buttons,
        .nbuttons       = ARRAY_SIZE(dns323c_buttons),
};

static struct platform_device dns323_button_device = {
        .name           = "gpio-keys",
        .id             = -1,
        .num_resources  = 0,
        .dev            = {
                .platform_data  = &dns323ab_button_data,
        },
};

/*****************************************************************************
 * SATA
 */
static struct mv_sata_platform_data dns323_sata_data = {
       .n_ports        = 2,
};

/****************************************************************************
 * General Setup
 */
static unsigned int dns323a_mpp_modes[] __initdata = {
        MPP0_PCIE_RST_OUTn,
        MPP1_GPIO,              /* right amber LED (sata ch0) */
        MPP2_GPIO,              /* left amber LED (sata ch1) */
        MPP3_UNUSED,
        MPP4_GPIO,              /* power button LED */
        MPP5_GPIO,              /* power button LED */
        MPP6_GPIO,              /* GMT G751-2f overtemp */
        MPP7_GPIO,              /* M41T80 nIRQ/OUT/SQW */
        MPP8_GPIO,              /* triggers power off */
        MPP9_GPIO,              /* power button switch */
        MPP10_GPIO,             /* reset button switch */
        MPP11_UNUSED,
        MPP12_UNUSED,
        MPP13_UNUSED,
        MPP14_UNUSED,
        MPP15_UNUSED,
        MPP16_UNUSED,
        MPP17_UNUSED,
        MPP18_UNUSED,
        MPP19_UNUSED,
        0,
};

static unsigned int dns323b_mpp_modes[] __initdata = {
        MPP0_UNUSED,
        MPP1_GPIO,              /* right amber LED (sata ch0) */
        MPP2_GPIO,              /* left amber LED (sata ch1) */
        MPP3_GPIO,              /* system up flag */
        MPP4_GPIO,              /* power button LED */
        MPP5_GPIO,              /* power button LED */
        MPP6_GPIO,              /* GMT G751-2f overtemp */
        MPP7_GPIO,              /* M41T80 nIRQ/OUT/SQW */
        MPP8_GPIO,              /* triggers power off */
        MPP9_GPIO,              /* power button switch */
        MPP10_GPIO,             /* reset button switch */
        MPP11_UNUSED,
        MPP12_SATA_LED,
        MPP13_SATA_LED,
        MPP14_SATA_LED,
        MPP15_SATA_LED,
        MPP16_UNUSED,
        MPP17_UNUSED,
        MPP18_UNUSED,
        MPP19_UNUSED,
        0,
};

static unsigned int dns323c_mpp_modes[] __initdata = {
        MPP0_GPIO,              /* ? input */
        MPP1_GPIO,              /* input power switch (0 = pressed) */
        MPP2_GPIO,              /* output power off */
        MPP3_UNUSED,            /* ? output */
        MPP4_UNUSED,            /* ? output */
        MPP5_UNUSED,            /* ? output */
        MPP6_UNUSED,            /* ? output */
        MPP7_UNUSED,            /* ? output */
        MPP8_GPIO,              /* i/o right amber LED */
        MPP9_GPIO,              /* i/o left amber LED */
        MPP10_GPIO,             /* input */
        MPP11_UNUSED,
        MPP12_SATA_LED,
        MPP13_SATA_LED,
        MPP14_SATA_LED,
        MPP15_SATA_LED,
        MPP16_UNUSED,
        MPP17_GPIO,             /* power button LED */
        MPP18_GPIO,             /* fan speed bit 0 */
        MPP19_GPIO,             /* fan speed bit 1 */
        0,
};

/* Rev C1 Fan speed notes:
 *
 * The fan is controlled by 2 GPIOs on this board. The settings
 * of the bits is as follow:
 *
 *  GPIO 18    GPIO 19    Fan
 *
 *    0          0        stopped
 *    0          1        low speed
 *    1          0        high speed
 *    1          1        don't do that (*)
 *
 * (*) I think the two bits control two feed-in resistors into a fixed
 *     PWN circuit, setting both bits will basically go a 'bit' faster
 *     than high speed, but d-link doesn't do it and you may get out of
 *     HW spec so don't do it.
 */

/*
 * On the DNS-323 A1 and B1 the following devices are attached via I2C:
 *
 *  i2c addr | chip        | description
 *  0x3e     | GMT G760Af  | fan speed PWM controller
 *  0x48     | GMT G751-2f | temp. sensor and therm. watchdog (LM75 compatible)
 *  0x68     | ST M41T80   | RTC w/ alarm
 */
static struct i2c_board_info __initdata dns323ab_i2c_devices[] = {
        {
                I2C_BOARD_INFO("g760a", 0x3e),
        }, {
                I2C_BOARD_INFO("lm75", 0x48),
        }, {
                I2C_BOARD_INFO("m41t80", 0x68),
        },
};

/*
 * On the DNS-323 C1 the following devices are attached via I2C:
 *
 *  i2c addr | chip        | description
 *  0x48     | GMT G751-2f | temp. sensor and therm. watchdog (LM75 compatible)
 *  0x68     | ST M41T80   | RTC w/ alarm
 */
static struct i2c_board_info __initdata dns323c_i2c_devices[] = {
        {
                I2C_BOARD_INFO("lm75", 0x48),
        }, {
                I2C_BOARD_INFO("m41t80", 0x68),
        },
};

/* DNS-323 rev. A specific power off method */
static void dns323a_power_off(void)
{
        pr_info("DNS-323: Triggering power-off...\n");
        gpio_set_value(DNS323_GPIO_POWER_OFF, 1);
}

/* DNS-323 rev B specific power off method */
static void dns323b_power_off(void)
{
        pr_info("DNS-323: Triggering power-off...\n");
        /* Pin has to be changed to 1 and back to 0 to do actual power off. */
        gpio_set_value(DNS323_GPIO_POWER_OFF, 1);
        mdelay(100);
        gpio_set_value(DNS323_GPIO_POWER_OFF, 0);
}

/* DNS-323 rev. C specific power off method */
static void dns323c_power_off(void)
{
        pr_info("DNS-323: Triggering power-off...\n");
        gpio_set_value(DNS323C_GPIO_POWER_OFF, 1);
}

static int dns323c_phy_fixup(struct phy_device *phy)
{
        phy->dev_flags |= MARVELL_PHY_M1118_DNS323_LEDS;

        return 0;
}

static int __init dns323_identify_rev(void)
{
        u32 dev, rev, i, reg;

        pr_debug("DNS-323: Identifying board ... \n");

        /* Rev A1 has a 5181 */
        orion5x_pcie_id(&dev, &rev);
        if (dev == MV88F5181_DEV_ID) {
                pr_debug("DNS-323: 5181 found, board is A1\n");
                return DNS323_REV_A1;
        }
        pr_debug("DNS-323: 5182 found, board is B1 or C1, checking PHY...\n");

        /* Rev B1 and C1 both have 5182, let's poke at the eth PHY. This is
         * a bit gross but we want to do that without links into the eth
         * driver so let's poke at it directly. We default to rev B1 in
         * case the accesses fail
         */

#define ETH_SMI_REG             (ORION5X_ETH_VIRT_BASE + 0x2000 + 0x004)
#define  SMI_BUSY               0x10000000
#define  SMI_READ_VALID         0x08000000
#define  SMI_OPCODE_READ        0x04000000
#define  SMI_OPCODE_WRITE       0x00000000

        for (i = 0; i < 1000; i++) {
                reg = readl(ETH_SMI_REG);
                if (!(reg & SMI_BUSY))
                        break;
        }
        if (i >= 1000) {
                pr_warn("DNS-323: Timeout accessing PHY, assuming rev B1\n");
                return DNS323_REV_B1;
        }
        writel((3 << 21)        /* phy ID reg */ |
               (8 << 16)        /* phy addr */ |
               SMI_OPCODE_READ, ETH_SMI_REG);
        for (i = 0; i < 1000; i++) {
                reg = readl(ETH_SMI_REG);
                if (reg & SMI_READ_VALID)
                        break;
        }
        if (i >= 1000) {
                pr_warn("DNS-323: Timeout reading PHY, assuming rev B1\n");
                return DNS323_REV_B1;
        }
        pr_debug("DNS-323: Ethernet PHY ID 0x%x\n", reg & 0xffff);

        /* Note: the Marvell tools mask the ID with 0x3f0 before comparison
         * but I don't see that making a difference here, at least with
         * any known Marvell PHY ID
         */
        switch(reg & 0xfff0) {
        case 0x0cc0: /* MV88E1111 */
                return DNS323_REV_B1;
        case 0x0e10: /* MV88E1118 */
                return DNS323_REV_C1;
        default:
                pr_warn("DNS-323: Unknown PHY ID 0x%04x, assuming rev B1\n",
                        reg & 0xffff);
        }
        return DNS323_REV_B1;
}

static void __init dns323_init(void)
{
        /* Setup basic Orion functions. Need to be called early. */
        orion5x_init();

        /* Identify revision */
        system_rev = dns323_identify_rev();
        pr_info("DNS-323: Identified HW revision %c1\n", 'A' + system_rev);

        /* Just to be tricky, the 5182 has a completely different
         * set of MPP modes to the 5181.
         */
        switch(system_rev) {
        case DNS323_REV_A1:
                orion5x_mpp_conf(dns323a_mpp_modes);
                writel(0, MPP_DEV_CTRL);                /* DEV_D[31:16] */
                break;
        case DNS323_REV_B1:
                orion5x_mpp_conf(dns323b_mpp_modes);
                break;
        case DNS323_REV_C1:
                orion5x_mpp_conf(dns323c_mpp_modes);
                break;
        }

        /* setup flash mapping
         * CS3 holds a 8 MB Spansion S29GL064M90TFIR4
         */
        mvebu_mbus_add_window_by_id(ORION_MBUS_DEVBUS_BOOT_TARGET,
                                    ORION_MBUS_DEVBUS_BOOT_ATTR,
                                    DNS323_NOR_BOOT_BASE,
                                    DNS323_NOR_BOOT_SIZE);
        platform_device_register(&dns323_nor_flash);

        /* Sort out LEDs, Buttons and i2c devices */
        switch(system_rev) {
        case DNS323_REV_A1:
                /* The 5181 power LED is active low and requires
                 * DNS323_GPIO_LED_POWER1 to also be low.
                 */
                 dns323ab_leds[0].active_low = 1;
                 gpio_request(DNS323_GPIO_LED_POWER1, "Power Led Enable");
                 gpio_direction_output(DNS323_GPIO_LED_POWER1, 0);
                /* Fall through */
        case DNS323_REV_B1:
                i2c_register_board_info(0, dns323ab_i2c_devices,
                                ARRAY_SIZE(dns323ab_i2c_devices));
                break;
        case DNS323_REV_C1:
                /* Hookup LEDs & Buttons */
                dns323_gpio_leds.dev.platform_data = &dns323c_led_data;
                dns323_button_device.dev.platform_data = &dns323c_button_data;

                /* Hookup i2c devices and fan driver */
                i2c_register_board_info(0, dns323c_i2c_devices,
                                ARRAY_SIZE(dns323c_i2c_devices));
                platform_device_register_simple("dns323c-fan", 0, NULL, 0);

                /* Register fixup for the PHY LEDs */
                if (!IS_BUILTIN(CONFIG_PHYLIB))
                        break;
                phy_register_fixup_for_uid(MARVELL_PHY_ID_88E1118,
                                           MARVELL_PHY_ID_MASK,
                                           dns323c_phy_fixup);
        }

        platform_device_register(&dns323_gpio_leds);
        platform_device_register(&dns323_button_device);

        /*
         * Configure peripherals.
         */
        if (dns323_read_mac_addr() < 0)
                printk("DNS-323: Failed to read MAC address\n");
        orion5x_ehci0_init();
        orion5x_eth_init(&dns323_eth_data);
        orion5x_i2c_init();
        orion5x_uart0_init();

        /* Remaining GPIOs */
        switch(system_rev) {
        case DNS323_REV_A1:
                /* Poweroff GPIO */
                if (gpio_request(DNS323_GPIO_POWER_OFF, "POWEROFF") != 0 ||
                    gpio_direction_output(DNS323_GPIO_POWER_OFF, 0) != 0)
                        pr_err("DNS-323: failed to setup power-off GPIO\n");
                pm_power_off = dns323a_power_off;
                break;
        case DNS323_REV_B1:
                /* 5182 built-in SATA init */
                orion5x_sata_init(&dns323_sata_data);

                /* The DNS323 rev B1 has flag to indicate the system is up.
                 * Without this flag set, power LED will flash and cannot be
                 * controlled via leds-gpio.
                 */
                if (gpio_request(DNS323_GPIO_SYSTEM_UP, "SYS_READY") == 0)
                        gpio_direction_output(DNS323_GPIO_SYSTEM_UP, 1);

                /* Poweroff GPIO */
                if (gpio_request(DNS323_GPIO_POWER_OFF, "POWEROFF") != 0 ||
                    gpio_direction_output(DNS323_GPIO_POWER_OFF, 0) != 0)
                        pr_err("DNS-323: failed to setup power-off GPIO\n");
                pm_power_off = dns323b_power_off;
                break;
        case DNS323_REV_C1:
                /* 5182 built-in SATA init */
                orion5x_sata_init(&dns323_sata_data);

                /* Poweroff GPIO */
                if (gpio_request(DNS323C_GPIO_POWER_OFF, "POWEROFF") != 0 ||
                    gpio_direction_output(DNS323C_GPIO_POWER_OFF, 0) != 0)
                        pr_err("DNS-323: failed to setup power-off GPIO\n");
                pm_power_off = dns323c_power_off;

                /* Now, -this- should theorically be done by the sata_mv driver
                 * once I figure out what's going on there. Maybe the behaviour
                 * of the LEDs should be somewhat passed via the platform_data.
                 * for now, just whack the register and make the LEDs happy
                 *
                 * Note: AFAIK, rev B1 needs the same treatement but I'll let
                 * somebody else test it.
                 */
                writel(0x5, ORION5X_SATA_VIRT_BASE + 0x2c);
                break;
        }
}

/* Warning: D-Link uses a wrong mach-type (=526) in their bootloader */
MACHINE_START(DNS323, "D-Link DNS-323")
        /* Maintainer: Herbert Valerio Riedel <hvr@gnu.org> */
        .atag_offset    = 0x100,
        .init_machine   = dns323_init,
        .map_io         = orion5x_map_io,
        .init_early     = orion5x_init_early,
        .init_irq       = orion5x_init_irq,
        .init_time      = orion5x_timer_init,
        .fixup          = tag_fixup_mem32,
        .restart        = orion5x_restart,
MACHINE_END