/*
 * linux/arch/arm/mach-footbridge/netwinder-hw.c
 *
 * Netwinder machine fixup
 *
 * Copyright (C) 1998, 1999 Russell King, Phil Blundell
 */
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/leds.h>

#include <asm/hardware/dec21285.h>
#include <asm/mach-types.h>
#include <asm/setup.h>
#include <asm/system_misc.h>

#include <asm/mach/arch.h>

#include "common.h"

#define IRDA_IO_BASE            0x180
#define GP1_IO_BASE             0x338
#define GP2_IO_BASE             0x33a

/*
 * Winbond WB83977F accessibility stuff
 */
static inline void wb977_open(void)
{
        outb(0x87, 0x370);
        outb(0x87, 0x370);
}

static inline void wb977_close(void)
{
        outb(0xaa, 0x370);
}

static inline void wb977_wb(int reg, int val)
{
        outb(reg, 0x370);
        outb(val, 0x371);
}

static inline void wb977_ww(int reg, int val)
{
        outb(reg, 0x370);
        outb(val >> 8, 0x371);
        outb(reg + 1, 0x370);
        outb(val & 255, 0x371);
}

#define wb977_device_select(dev)        wb977_wb(0x07, dev)
#define wb977_device_disable()          wb977_wb(0x30, 0x00)
#define wb977_device_enable()           wb977_wb(0x30, 0x01)

/*
 * This is a lock for accessing ports GP1_IO_BASE and GP2_IO_BASE
 */
DEFINE_RAW_SPINLOCK(nw_gpio_lock);
EXPORT_SYMBOL(nw_gpio_lock);

static unsigned int current_gpio_op;
static unsigned int current_gpio_io;
static unsigned int current_cpld;

void nw_gpio_modify_op(unsigned int mask, unsigned int set)
{
        unsigned int new_gpio, changed;

        new_gpio = (current_gpio_op & ~mask) | set;
        changed = new_gpio ^ current_gpio_op;
        current_gpio_op = new_gpio;

        if (changed & 0xff)
                outb(new_gpio, GP1_IO_BASE);
        if (changed & 0xff00)
                outb(new_gpio >> 8, GP2_IO_BASE);
}
EXPORT_SYMBOL(nw_gpio_modify_op);

static inline void __gpio_modify_io(int mask, int in)
{
        unsigned int new_gpio, changed;
        int port;

        new_gpio = (current_gpio_io & ~mask) | in;
        changed = new_gpio ^ current_gpio_io;
        current_gpio_io = new_gpio;

        changed >>= 1;
        new_gpio >>= 1;

        wb977_device_select(7);

        for (port = 0xe1; changed && port < 0xe8; changed >>= 1) {
                wb977_wb(port, new_gpio & 1);

                port += 1;
                new_gpio >>= 1;
        }

        wb977_device_select(8);

        for (port = 0xe8; changed && port < 0xec; changed >>= 1) {
                wb977_wb(port, new_gpio & 1);

                port += 1;
                new_gpio >>= 1;
        }
}

void nw_gpio_modify_io(unsigned int mask, unsigned int in)
{
        /* Open up the SuperIO chip */
        wb977_open();

        __gpio_modify_io(mask, in);

        /* Close up the EFER gate */
        wb977_close();
}
EXPORT_SYMBOL(nw_gpio_modify_io);

unsigned int nw_gpio_read(void)
{
        return inb(GP1_IO_BASE) | inb(GP2_IO_BASE) << 8;
}
EXPORT_SYMBOL(nw_gpio_read);

/*
 * Initialise the Winbond W83977F global registers
 */
static inline void wb977_init_global(void)
{
        /*
         * Enable R/W config registers
         */
        wb977_wb(0x26, 0x40);

        /*
         * Power down FDC (not used)
         */
        wb977_wb(0x22, 0xfe);

        /*
         * GP12, GP11, CIRRX, IRRXH, GP10
         */
        wb977_wb(0x2a, 0xc1);

        /*
         * GP23, GP22, GP21, GP20, GP13
         */
        wb977_wb(0x2b, 0x6b);

        /*
         * GP17, GP16, GP15, GP14
         */
        wb977_wb(0x2c, 0x55);
}

/*
 * Initialise the Winbond W83977F printer port
 */
static inline void wb977_init_printer(void)
{
        wb977_device_select(1);

        /*
         * mode 1 == EPP
         */
        wb977_wb(0xf0, 0x01);
}

/*
 * Initialise the Winbond W83977F keyboard controller
 */
static inline void wb977_init_keyboard(void)
{
        wb977_device_select(5);

        /*
         * Keyboard controller address
         */
        wb977_ww(0x60, 0x0060);
        wb977_ww(0x62, 0x0064);

        /*
         * Keyboard IRQ 1, active high, edge trigger
         */
        wb977_wb(0x70, 1);
        wb977_wb(0x71, 0x02);

        /*
         * Mouse IRQ 5, active high, edge trigger
         */
        wb977_wb(0x72, 5);
        wb977_wb(0x73, 0x02);

        /*
         * KBC 8MHz
         */
        wb977_wb(0xf0, 0x40);

        /*
         * Enable device
         */
        wb977_device_enable();
}

/*
 * Initialise the Winbond W83977F Infra-Red device
 */
static inline void wb977_init_irda(void)
{
        wb977_device_select(6);

        /*
         * IR base address
         */
        wb977_ww(0x60, IRDA_IO_BASE);

        /*
         * IRDA IRQ 6, active high, edge trigger
         */
        wb977_wb(0x70, 6);
        wb977_wb(0x71, 0x02);

        /*
         * RX DMA - ISA DMA 0
         */
        wb977_wb(0x74, 0x00);

        /*
         * TX DMA - Disable Tx DMA
         */
        wb977_wb(0x75, 0x04);

        /*
         * Append CRC, Enable bank selection
         */
        wb977_wb(0xf0, 0x03);

        /*
         * Enable device
         */
        wb977_device_enable();
}

/*
 * Initialise Winbond W83977F general purpose IO
 */
static inline void wb977_init_gpio(void)
{
        unsigned long flags;

        /*
         * Set up initial I/O definitions
         */
        current_gpio_io = -1;
        __gpio_modify_io(-1, GPIO_DONE | GPIO_WDTIMER);

        wb977_device_select(7);

        /*
         * Group1 base address
         */
        wb977_ww(0x60, GP1_IO_BASE);
        wb977_ww(0x62, 0);
        wb977_ww(0x64, 0);

        /*
         * GP10 (Orage button) IRQ 10, active high, edge trigger
         */
        wb977_wb(0x70, 10);
        wb977_wb(0x71, 0x02);

        /*
         * GP10: Debounce filter enabled, IRQ, input
         */
        wb977_wb(0xe0, 0x19);

        /*
         * Enable Group1
         */
        wb977_device_enable();

        wb977_device_select(8);

        /*
         * Group2 base address
         */
        wb977_ww(0x60, GP2_IO_BASE);

        /*
         * Clear watchdog timer regs
         *  - timer disable
         */
        wb977_wb(0xf2, 0x00);

        /*
         *  - disable LED, no mouse nor keyboard IRQ
         */
        wb977_wb(0xf3, 0x00);

        /*
         *  - timer counting, disable power LED, disable timeouot
         */
        wb977_wb(0xf4, 0x00);

        /*
         * Enable group2
         */
        wb977_device_enable();

        /*
         * Set Group1/Group2 outputs
         */
        raw_spin_lock_irqsave(&nw_gpio_lock, flags);
        nw_gpio_modify_op(-1, GPIO_RED_LED | GPIO_FAN);
        raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
}

/*
 * Initialise the Winbond W83977F chip.
 */
static void __init wb977_init(void)
{
        request_region(0x370, 2, "W83977AF configuration");

        /*
         * Open up the SuperIO chip
         */
        wb977_open();

        /*
         * Initialise the global registers
         */
        wb977_init_global();

        /*
         * Initialise the various devices in
         * the multi-IO chip.
         */
        wb977_init_printer();
        wb977_init_keyboard();
        wb977_init_irda();
        wb977_init_gpio();

        /*
         * Close up the EFER gate
         */
        wb977_close();
}

void nw_cpld_modify(unsigned int mask, unsigned int set)
{
        int msk;

        current_cpld = (current_cpld & ~mask) | set;

        nw_gpio_modify_io(GPIO_DATA | GPIO_IOCLK | GPIO_IOLOAD, 0);
        nw_gpio_modify_op(GPIO_IOLOAD, 0);

        for (msk = 8; msk; msk >>= 1) {
                int bit = current_cpld & msk;

                nw_gpio_modify_op(GPIO_DATA | GPIO_IOCLK, bit ? GPIO_DATA : 0);
                nw_gpio_modify_op(GPIO_IOCLK, GPIO_IOCLK);
        }

        nw_gpio_modify_op(GPIO_IOCLK|GPIO_DATA, 0);
        nw_gpio_modify_op(GPIO_IOLOAD|GPIO_DSCLK, GPIO_IOLOAD|GPIO_DSCLK);
        nw_gpio_modify_op(GPIO_IOLOAD, 0);
}
EXPORT_SYMBOL(nw_cpld_modify);

static void __init cpld_init(void)
{
        unsigned long flags;

        raw_spin_lock_irqsave(&nw_gpio_lock, flags);
        nw_cpld_modify(-1, CPLD_UNMUTE | CPLD_7111_DISABLE);
        raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
}

static unsigned char rwa_unlock[] __initdata =
{ 0x00, 0x00, 0x6a, 0xb5, 0xda, 0xed, 0xf6, 0xfb, 0x7d, 0xbe, 0xdf, 0x6f, 0x37, 0x1b,
  0x0d, 0x86, 0xc3, 0x61, 0xb0, 0x58, 0x2c, 0x16, 0x8b, 0x45, 0xa2, 0xd1, 0xe8, 0x74,
  0x3a, 0x9d, 0xce, 0xe7, 0x73, 0x39 };

#ifndef DEBUG
#define dprintk(x...)
#else
#define dprintk(x...) printk(x)
#endif

#define WRITE_RWA(r,v) do { outb((r), 0x279); udelay(10); outb((v), 0xa79); } while (0)

static inline void rwa010_unlock(void)
{
        int i;

        WRITE_RWA(2, 2);
        mdelay(10);

        for (i = 0; i < sizeof(rwa_unlock); i++) {
                outb(rwa_unlock[i], 0x279);
                udelay(10);
        }
}

static inline void rwa010_read_ident(void)
{
        unsigned char si[9];
        int i, j;

        WRITE_RWA(3, 0);
        WRITE_RWA(0, 128);

        outb(1, 0x279);

        mdelay(1);

        dprintk("Identifier: ");
        for (i = 0; i < 9; i++) {
                si[i] = 0;
                for (j = 0; j < 8; j++) {
                        int bit;
                        udelay(250);
                        inb(0x203);
                        udelay(250);
                        bit = inb(0x203);
                        dprintk("%02X ", bit);
                        bit = (bit == 0xaa) ? 1 : 0;
                        si[i] |= bit << j;
                }
                dprintk("(%02X) ", si[i]);
        }
        dprintk("\n");
}

static inline void rwa010_global_init(void)
{
        WRITE_RWA(6, 2);        // Assign a card no = 2

        dprintk("Card no = %d\n", inb(0x203));

        /* disable the modem section of the chip */
        WRITE_RWA(7, 3);
        WRITE_RWA(0x30, 0);

        /* disable the cdrom section of the chip */
        WRITE_RWA(7, 4);
        WRITE_RWA(0x30, 0);

        /* disable the MPU-401 section of the chip */
        WRITE_RWA(7, 2);
        WRITE_RWA(0x30, 0);
}

static inline void rwa010_game_port_init(void)
{
        int i;

        WRITE_RWA(7, 5);

        dprintk("Slider base: ");
        WRITE_RWA(0x61, 1);
        i = inb(0x203);

        WRITE_RWA(0x60, 2);
        dprintk("%02X%02X (201)\n", inb(0x203), i);

        WRITE_RWA(0x30, 1);
}

static inline void rwa010_waveartist_init(int base, int irq, int dma)
{
        int i;

        WRITE_RWA(7, 0);

        dprintk("WaveArtist base: ");
        WRITE_RWA(0x61, base & 255);
        i = inb(0x203);

        WRITE_RWA(0x60, base >> 8);
        dprintk("%02X%02X (%X),", inb(0x203), i, base);

        WRITE_RWA(0x70, irq);
        dprintk(" irq: %d (%d),", inb(0x203), irq);

        WRITE_RWA(0x74, dma);
        dprintk(" dma: %d (%d)\n", inb(0x203), dma);

        WRITE_RWA(0x30, 1);
}

static inline void rwa010_soundblaster_init(int sb_base, int al_base, int irq, int dma)
{
        int i;

        WRITE_RWA(7, 1);

        dprintk("SoundBlaster base: ");
        WRITE_RWA(0x61, sb_base & 255);
        i = inb(0x203);

        WRITE_RWA(0x60, sb_base >> 8);
        dprintk("%02X%02X (%X),", inb(0x203), i, sb_base);

        dprintk(" irq: ");
        WRITE_RWA(0x70, irq);
        dprintk("%d (%d),", inb(0x203), irq);

        dprintk(" 8-bit DMA: ");
        WRITE_RWA(0x74, dma);
        dprintk("%d (%d)\n", inb(0x203), dma);

        dprintk("AdLib base: ");
        WRITE_RWA(0x63, al_base & 255);
        i = inb(0x203);

        WRITE_RWA(0x62, al_base >> 8);
        dprintk("%02X%02X (%X)\n", inb(0x203), i, al_base);

        WRITE_RWA(0x30, 1);
}

static void rwa010_soundblaster_reset(void)
{
        int i;

        outb(1, 0x226);
        udelay(3);
        outb(0, 0x226);

        for (i = 0; i < 5; i++) {
                if (inb(0x22e) & 0x80)
                        break;
                mdelay(1);
        }
        if (i == 5)
                printk("SoundBlaster: DSP reset failed\n");

        dprintk("SoundBlaster DSP reset: %02X (AA)\n", inb(0x22a));

        for (i = 0; i < 5; i++) {
                if ((inb(0x22c) & 0x80) == 0)
                        break;
                mdelay(1);
        }

        if (i == 5)
                printk("SoundBlaster: DSP not ready\n");
        else {
                outb(0xe1, 0x22c);

                dprintk("SoundBlaster DSP id: ");
                i = inb(0x22a);
                udelay(1);
                i |= inb(0x22a) << 8;
                dprintk("%04X\n", i);

                for (i = 0; i < 5; i++) {
                        if ((inb(0x22c) & 0x80) == 0)
                                break;
                        mdelay(1);
                }

                if (i == 5)
                        printk("SoundBlaster: could not turn speaker off\n");

                outb(0xd3, 0x22c);
        }

        /* turn on OPL3 */
        outb(5, 0x38a);
        outb(1, 0x38b);
}

static void __init rwa010_init(void)
{
        rwa010_unlock();
        rwa010_read_ident();
        rwa010_global_init();
        rwa010_game_port_init();
        rwa010_waveartist_init(0x250, 3, 7);
        rwa010_soundblaster_init(0x220, 0x388, 3, 1);
        rwa010_soundblaster_reset();
}

/*
 * Initialise any other hardware after we've got the PCI bus
 * initialised.  We may need the PCI bus to talk to this other
 * hardware.
 */
static int __init nw_hw_init(void)
{
        if (machine_is_netwinder()) {
                wb977_init();
                cpld_init();
                rwa010_init();
        }
        return 0;
}

__initcall(nw_hw_init);

/*
 * Older NeTTroms either do not provide a parameters
 * page, or they don't supply correct information in
 * the parameter page.
 */
static void __init
fixup_netwinder(struct tag *tags, char **cmdline)
{
#ifdef CONFIG_ISAPNP
        extern int isapnp_disable;

        /*
         * We must not use the kernels ISAPnP code
         * on the NetWinder - it will reset the settings
         * for the WaveArtist chip and render it inoperable.
         */
        isapnp_disable = 1;
#endif
}

static void netwinder_restart(enum reboot_mode mode, const char *cmd)
{
        if (mode == REBOOT_SOFT) {
                /* Jump into the ROM */
                soft_restart(0x41000000);
        } else {
                local_irq_disable();
                local_fiq_disable();

                /* open up the SuperIO chip */
                outb(0x87, 0x370);
                outb(0x87, 0x370);

                /* aux function group 1 (logical device 7) */
                outb(0x07, 0x370);
                outb(0x07, 0x371);

                /* set GP16 for WD-TIMER output */
                outb(0xe6, 0x370);
                outb(0x00, 0x371);

                /* set a RED LED and toggle WD_TIMER for rebooting */
                outb(0xc4, 0x338);
        }
}

/* LEDs */
#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
struct netwinder_led {
        struct led_classdev     cdev;
        u8                      mask;
};

/*
 * The triggers lines up below will only be used if the
 * LED triggers are compiled in.
 */
static const struct {
        const char *name;
        const char *trigger;
} netwinder_leds[] = {
        { "netwinder:green", "heartbeat", },
        { "netwinder:red", "cpu0", },
};

/*
 * The LED control in Netwinder is reversed:
 *  - setting bit means turn off LED
 *  - clearing bit means turn on LED
 */
static void netwinder_led_set(struct led_classdev *cdev,
                enum led_brightness b)
{
        struct netwinder_led *led = container_of(cdev,
                        struct netwinder_led, cdev);
        unsigned long flags;
        u32 reg;

        raw_spin_lock_irqsave(&nw_gpio_lock, flags);
        reg = nw_gpio_read();
        if (b != LED_OFF)
                reg &= ~led->mask;
        else
                reg |= led->mask;
        nw_gpio_modify_op(led->mask, reg);
        raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);
}

static enum led_brightness netwinder_led_get(struct led_classdev *cdev)
{
        struct netwinder_led *led = container_of(cdev,
                        struct netwinder_led, cdev);
        unsigned long flags;
        u32 reg;

        raw_spin_lock_irqsave(&nw_gpio_lock, flags);
        reg = nw_gpio_read();
        raw_spin_unlock_irqrestore(&nw_gpio_lock, flags);

        return (reg & led->mask) ? LED_OFF : LED_FULL;
}

static int __init netwinder_leds_init(void)
{
        int i;

        if (!machine_is_netwinder())
                return -ENODEV;

        for (i = 0; i < ARRAY_SIZE(netwinder_leds); i++) {
                struct netwinder_led *led;

                led = kzalloc(sizeof(*led), GFP_KERNEL);
                if (!led)
                        break;

                led->cdev.name = netwinder_leds[i].name;
                led->cdev.brightness_set = netwinder_led_set;
                led->cdev.brightness_get = netwinder_led_get;
                led->cdev.default_trigger = netwinder_leds[i].trigger;

                if (i == 0)
                        led->mask = GPIO_GREEN_LED;
                else
                        led->mask = GPIO_RED_LED;

                if (led_classdev_register(NULL, &led->cdev) < 0) {
                        kfree(led);
                        break;
                }
        }

        return 0;
}

/*
 * Since we may have triggers on any subsystem, defer registration
 * until after subsystem_init.
 */
fs_initcall(netwinder_leds_init);
#endif

MACHINE_START(NETWINDER, "Rebel-NetWinder")
        /* Maintainer: Russell King/Rebel.com */
        .atag_offset    = 0x100,
        .video_start    = 0x000a0000,
        .video_end      = 0x000bffff,
        .reserve_lp0    = 1,
        .reserve_lp2    = 1,
        .fixup          = fixup_netwinder,
        .map_io         = footbridge_map_io,
        .init_irq       = footbridge_init_irq,
        .init_time      = isa_timer_init,
        .restart        = netwinder_restart,
MACHINE_END