assabet.c

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/*
 * linux/arch/arm/mach-sa1100/assabet.c
 *
 * Author: Nicolas Pitre
 *
 * This file contains all Assabet-specific tweaks.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/serial_core.h>
#include <linux/mfd/ucb1x00.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/leds.h>
#include <linux/slab.h>

#include <video/sa1100fb.h>

#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgtable-hwdef.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>

#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
#include <asm/mach/irda.h>
#include <asm/mach/map.h>
#include <asm/mach/serial_sa1100.h>
#include <mach/assabet.h>
#include <linux/platform_data/mfd-mcp-sa11x0.h>
#include <mach/irqs.h>

#include "generic.h"

#define ASSABET_BCR_DB1110 \
    (ASSABET_BCR_SPK_OFF    | \
     ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
     ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
     ASSABET_BCR_IRDA_MD0)

#define ASSABET_BCR_DB1111 \
    (ASSABET_BCR_SPK_OFF    | \
     ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
     ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
     ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_STEREO_LB | \
     ASSABET_BCR_IRDA_MD0   | ASSABET_BCR_CF_RST)

unsigned long SCR_value = ASSABET_SCR_INIT;
EXPORT_SYMBOL(SCR_value);

static unsigned long BCR_value = ASSABET_BCR_DB1110;

void ASSABET_BCR_frob(unsigned int mask, unsigned int val)
{
    unsigned long flags;

    local_irq_save(flags);
    BCR_value = (BCR_value & ~mask) | val;
    ASSABET_BCR = BCR_value;
    local_irq_restore(flags);
}

EXPORT_SYMBOL(ASSABET_BCR_frob);

static void assabet_ucb1x00_reset(enum ucb1x00_reset state)
{
    if (state == UCB_RST_PROBE)
        ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);
}


/*
 * Assabet flash support code.
 */

#ifdef ASSABET_REV_4
/*
 * Phase 4 Assabet has two 28F160B3 flash parts in bank 0:
 */
static struct mtd_partition assabet_partitions[] = {
    {
        .name       = "bootloader",
        .size       = 0x00020000,
        .offset     = 0,
        .mask_flags = MTD_WRITEABLE,
    }, {
        .name       = "bootloader params",
        .size       = 0x00020000,
        .offset     = MTDPART_OFS_APPEND,
        .mask_flags = MTD_WRITEABLE,
    }, {
        .name       = "jffs",
        .size       = MTDPART_SIZ_FULL,
        .offset     = MTDPART_OFS_APPEND,
    }
};
#else
/*
 * Phase 5 Assabet has two 28F128J3A flash parts in bank 0:
 */
static struct mtd_partition assabet_partitions[] = {
    {
        .name       = "bootloader",
        .size       = 0x00040000,
        .offset     = 0,
        .mask_flags = MTD_WRITEABLE,
    }, {
        .name       = "bootloader params",
        .size       = 0x00040000,
        .offset     = MTDPART_OFS_APPEND,
        .mask_flags = MTD_WRITEABLE,
    }, {
        .name       = "jffs",
        .size       = MTDPART_SIZ_FULL,
        .offset     = MTDPART_OFS_APPEND,
    }
};
#endif

static struct flash_platform_data assabet_flash_data = {
    .map_name   = "cfi_probe",
    .parts      = assabet_partitions,
    .nr_parts   = ARRAY_SIZE(assabet_partitions),
};

static struct resource assabet_flash_resources[] = {
    DEFINE_RES_MEM(SA1100_CS0_PHYS, SZ_32M),
    DEFINE_RES_MEM(SA1100_CS1_PHYS, SZ_32M),
};


/*
 * Assabet IrDA support code.
 */

static int assabet_irda_set_power(struct device *dev, unsigned int state)
{
    static unsigned int bcr_state[4] = {
        ASSABET_BCR_IRDA_MD0,
        ASSABET_BCR_IRDA_MD1|ASSABET_BCR_IRDA_MD0,
        ASSABET_BCR_IRDA_MD1,
        0
    };

    if (state < 4) {
        state = bcr_state[state];
        ASSABET_BCR_clear(state ^ (ASSABET_BCR_IRDA_MD1|
                       ASSABET_BCR_IRDA_MD0));
        ASSABET_BCR_set(state);
    }
    return 0;
}

static void assabet_irda_set_speed(struct device *dev, unsigned int speed)
{
    if (speed < 4000000)
        ASSABET_BCR_clear(ASSABET_BCR_IRDA_FSEL);
    else
        ASSABET_BCR_set(ASSABET_BCR_IRDA_FSEL);
}

static struct irda_platform_data assabet_irda_data = {
    .set_power  = assabet_irda_set_power,
    .set_speed  = assabet_irda_set_speed,
};

static struct ucb1x00_plat_data assabet_ucb1x00_data = {
    .reset      = assabet_ucb1x00_reset,
    .gpio_base  = -1,
};

static struct mcp_plat_data assabet_mcp_data = {
    .mccr0      = MCCR0_ADM,
    .sclk_rate  = 11981000,
    .codec_pdata    = &assabet_ucb1x00_data,
};

static void assabet_lcd_set_visual(u32 visual)
{
    u_int is_true_color = visual == FB_VISUAL_TRUECOLOR;

    if (machine_is_assabet()) {
#if 1       // phase 4 or newer Assabet's
        if (is_true_color)
            ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB);
        else
            ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB);
#else
        // older Assabet's
        if (is_true_color)
            ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB);
        else
            ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB);
#endif
    }
}

#ifndef ASSABET_PAL_VIDEO
static void assabet_lcd_backlight_power(int on)
{
    if (on)
        ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON);
    else
        ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
}

/*
 * Turn on/off the backlight.  When turning the backlight on, we wait
 * 500us after turning it on so we don't cause the supplies to droop
 * when we enable the LCD controller (and cause a hard reset.)
 */
static void assabet_lcd_power(int on)
{
    if (on) {
        ASSABET_BCR_set(ASSABET_BCR_LCD_ON);
        udelay(500);
    } else
        ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
}

/*
 * The assabet uses a sharp LQ039Q2DS54 LCD module.  It is actually
 * takes an RGB666 signal, but we provide it with an RGB565 signal
 * instead (def_rgb_16).
 */
static struct sa1100fb_mach_info lq039q2ds54_info = {
    .pixclock   = 171521,   .bpp        = 16,
    .xres       = 320,      .yres       = 240,

    .hsync_len  = 5,        .vsync_len  = 1,
    .left_margin    = 61,       .upper_margin   = 3,
    .right_margin   = 9,        .lower_margin   = 0,

    .sync       = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,

    .lccr0      = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
    .lccr3      = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),

    .backlight_power = assabet_lcd_backlight_power,
    .lcd_power = assabet_lcd_power,
    .set_visual = assabet_lcd_set_visual,
};
#else
static void assabet_pal_backlight_power(int on)
{
    ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
}

static void assabet_pal_power(int on)
{
    ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
}

static struct sa1100fb_mach_info pal_info = {
    .pixclock   = 67797,    .bpp        = 16,
    .xres       = 640,      .yres       = 512,

    .hsync_len  = 64,       .vsync_len  = 6,
    .left_margin    = 125,      .upper_margin   = 70,
    .right_margin   = 115,      .lower_margin   = 36,

    .lccr0      = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
    .lccr3      = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(512),

    .backlight_power = assabet_pal_backlight_power,
    .lcd_power = assabet_pal_power,
    .set_visual = assabet_lcd_set_visual,
};
#endif

#ifdef CONFIG_ASSABET_NEPONSET
static struct resource neponset_resources[] = {
    DEFINE_RES_MEM(0x10000000, 0x08000000),
    DEFINE_RES_MEM(0x18000000, 0x04000000),
    DEFINE_RES_MEM(0x40000000, SZ_8K),
    DEFINE_RES_IRQ(IRQ_GPIO25),
};
#endif

static void __init assabet_init(void)
{
    /*
     * Ensure that the power supply is in "high power" mode.
     */
    GPSR = GPIO_GPIO16;
    GPDR |= GPIO_GPIO16;

    /*
     * Ensure that these pins are set as outputs and are driving
     * logic 0.  This ensures that we won't inadvertently toggle
     * the WS latch in the CPLD, and we don't float causing
     * excessive power drain.  --rmk
     */
    GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
    GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;

    /*
     * Also set GPIO27 as an output; this is used to clock UART3
     * via the FPGA and as otherwise has no pullups or pulldowns,
     * so stop it floating.
     */
    GPCR = GPIO_GPIO27;
    GPDR |= GPIO_GPIO27;

    /*
     * Set up registers for sleep mode.
     */
    PWER = PWER_GPIO0;
    PGSR = 0;
    PCFR = 0;
    PSDR = 0;
    PPDR |= PPC_TXD3 | PPC_TXD1;
    PPSR |= PPC_TXD3 | PPC_TXD1;

    sa11x0_ppc_configure_mcp();

    if (machine_has_neponset()) {
        /*
         * Angel sets this, but other bootloaders may not.
         *
         * This must precede any driver calls to BCR_set()
         * or BCR_clear().
         */
        ASSABET_BCR = BCR_value = ASSABET_BCR_DB1111;

#ifndef CONFIG_ASSABET_NEPONSET
        printk( "Warning: Neponset detected but full support "
            "hasn't been configured in the kernel\n" );
#else
        platform_device_register_simple("neponset", 0,
            neponset_resources, ARRAY_SIZE(neponset_resources));
#endif
    }

#ifndef ASSABET_PAL_VIDEO
    sa11x0_register_lcd(&lq039q2ds54_info);
#else
    sa11x0_register_lcd(&pal_video);
#endif
    sa11x0_register_mtd(&assabet_flash_data, assabet_flash_resources,
                ARRAY_SIZE(assabet_flash_resources));
    sa11x0_register_irda(&assabet_irda_data);
    sa11x0_register_mcp(&assabet_mcp_data);
}

/*
 * On Assabet, we must probe for the Neponset board _before_
 * paging_init() has occurred to actually determine the amount
 * of RAM available.  To do so, we map the appropriate IO section
 * in the page table here in order to access GPIO registers.
 */
static void __init map_sa1100_gpio_regs( void )
{
    unsigned long phys = __PREG(GPLR) & PMD_MASK;
    unsigned long virt = (unsigned long)io_p2v(phys);
    int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
    pmd_t *pmd;

    pmd = pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
    *pmd = __pmd(phys | prot);
    flush_pmd_entry(pmd);
}

/*
 * Read System Configuration "Register"
 * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
 * User's Guide", section 4.4.1)
 *
 * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S
 * to set up the serial port for decompression status messages. We
 * repeat it here because the kernel may not be loaded as a zImage, and
 * also because it's a hassle to communicate the SCR value to the kernel
 * from the decompressor.
 *
 * Note that IRQs are guaranteed to be disabled.
 */
static void __init get_assabet_scr(void)
{
    unsigned long uninitialized_var(scr), i;

    GPDR |= 0x3fc;          /* Configure GPIO 9:2 as outputs */
    GPSR = 0x3fc;           /* Write 0xFF to GPIO 9:2 */
    GPDR &= ~(0x3fc);       /* Configure GPIO 9:2 as inputs */
    for(i = 100; i--; )     /* Read GPIO 9:2 */
        scr = GPLR;
    GPDR |= 0x3fc;          /*  restore correct pin direction */
    scr &= 0x3fc;           /* save as system configuration byte. */
    SCR_value = scr;
}

static void __init
fixup_assabet(struct tag *tags, char **cmdline, struct meminfo *mi)
{
    /* This must be done before any call to machine_has_neponset() */
    map_sa1100_gpio_regs();
    get_assabet_scr();

    if (machine_has_neponset())
        printk("Neponset expansion board detected\n");
}


static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
{
    if (port->mapbase == _Ser1UTCR0) {
        if (state)
            ASSABET_BCR_clear(ASSABET_BCR_RS232EN |
                      ASSABET_BCR_COM_RTS |
                      ASSABET_BCR_COM_DTR);
        else
            ASSABET_BCR_set(ASSABET_BCR_RS232EN |
                    ASSABET_BCR_COM_RTS |
                    ASSABET_BCR_COM_DTR);
    }
}

/*
 * Assabet uses COM_RTS and COM_DTR for both UART1 (com port)
 * and UART3 (radio module).  We only handle them for UART1 here.
 */
static void assabet_set_mctrl(struct uart_port *port, u_int mctrl)
{
    if (port->mapbase == _Ser1UTCR0) {
        u_int set = 0, clear = 0;

        if (mctrl & TIOCM_RTS)
            clear |= ASSABET_BCR_COM_RTS;
        else
            set |= ASSABET_BCR_COM_RTS;

        if (mctrl & TIOCM_DTR)
            clear |= ASSABET_BCR_COM_DTR;
        else
            set |= ASSABET_BCR_COM_DTR;

        ASSABET_BCR_clear(clear);
        ASSABET_BCR_set(set);
    }
}

static u_int assabet_get_mctrl(struct uart_port *port)
{
    u_int ret = 0;
    u_int bsr = ASSABET_BSR;

    /* need 2 reads to read current value */
    bsr = ASSABET_BSR;

    if (port->mapbase == _Ser1UTCR0) {
        if (bsr & ASSABET_BSR_COM_DCD)
            ret |= TIOCM_CD;
        if (bsr & ASSABET_BSR_COM_CTS)
            ret |= TIOCM_CTS;
        if (bsr & ASSABET_BSR_COM_DSR)
            ret |= TIOCM_DSR;
    } else if (port->mapbase == _Ser3UTCR0) {
        if (bsr & ASSABET_BSR_RAD_DCD)
            ret |= TIOCM_CD;
        if (bsr & ASSABET_BSR_RAD_CTS)
            ret |= TIOCM_CTS;
        if (bsr & ASSABET_BSR_RAD_DSR)
            ret |= TIOCM_DSR;
        if (bsr & ASSABET_BSR_RAD_RI)
            ret |= TIOCM_RI;
    } else {
        ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
    }

    return ret;
}

static struct sa1100_port_fns assabet_port_fns __initdata = {
    .set_mctrl  = assabet_set_mctrl,
    .get_mctrl  = assabet_get_mctrl,
    .pm     = assabet_uart_pm,
};

static struct map_desc assabet_io_desc[] __initdata = {
    {   /* Board Control Register */
        .virtual    =  0xf1000000,
        .pfn        = __phys_to_pfn(0x12000000),
        .length     = 0x00100000,
        .type       = MT_DEVICE
    }, {    /* MQ200 */
        .virtual    =  0xf2800000,
        .pfn        = __phys_to_pfn(0x4b800000),
        .length     = 0x00800000,
        .type       = MT_DEVICE
    }
};

static void __init assabet_map_io(void)
{
    sa1100_map_io();
    iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc));

    /*
     * Set SUS bit in SDCR0 so serial port 1 functions.
     * Its called GPCLKR0 in my SA1110 manual.
     */
    Ser1SDCR0 |= SDCR0_SUS;

    if (!machine_has_neponset())
        sa1100_register_uart_fns(&assabet_port_fns);

    /*
     * When Neponset is attached, the first UART should be
     * UART3.  That's what Angel is doing and many documents
     * are stating this.
     *
     * We do the Neponset mapping even if Neponset support
     * isn't compiled in so the user will still get something on
     * the expected physical serial port.
     *
     * We no longer do this; not all boot loaders support it,
     * and UART3 appears to be somewhat unreliable with blob.
     */
    sa1100_register_uart(0, 1);
    sa1100_register_uart(2, 3);
}

/* LEDs */
#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
struct assabet_led {
    struct led_classdev cdev;
    u32 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;
} assabet_leds[] = {
    { "assabet:red", "cpu0",},
    { "assabet:green", "heartbeat", },
};

/*
 * The LED control in Assabet is reversed:
 *  - setting bit means turn off LED
 *  - clearing bit means turn on LED
 */
static void assabet_led_set(struct led_classdev *cdev,
        enum led_brightness b)
{
    struct assabet_led *led = container_of(cdev,
            struct assabet_led, cdev);

    if (b != LED_OFF)
        ASSABET_BCR_clear(led->mask);
    else
        ASSABET_BCR_set(led->mask);
}

static enum led_brightness assabet_led_get(struct led_classdev *cdev)
{
    struct assabet_led *led = container_of(cdev,
            struct assabet_led, cdev);

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

static int __init assabet_leds_init(void)
{
    int i;

    if (!machine_is_assabet())
        return -ENODEV;

    for (i = 0; i < ARRAY_SIZE(assabet_leds); i++) {
        struct assabet_led *led;

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

        led->cdev.name = assabet_leds[i].name;
        led->cdev.brightness_set = assabet_led_set;
        led->cdev.brightness_get = assabet_led_get;
        led->cdev.default_trigger = assabet_leds[i].trigger;

        if (!i)
            led->mask = ASSABET_BCR_LED_RED;
        else
            led->mask = ASSABET_BCR_LED_GREEN;

        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(assabet_leds_init);
#endif

MACHINE_START(ASSABET, "Intel-Assabet")
    .atag_offset    = 0x100,
    .fixup      = fixup_assabet,
    .map_io     = assabet_map_io,
    .nr_irqs    = SA1100_NR_IRQS,
    .init_irq   = sa1100_init_irq,
    .timer      = &sa1100_timer,
    .init_machine   = assabet_init,
    .init_late  = sa11x0_init_late,
#ifdef CONFIG_SA1111
    .dma_zone_size  = SZ_1M,
#endif
    .restart    = sa11x0_restart,
MACHINE_END