linux/arch/arm/mach-sa1100/assabet.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * linux/arch/arm/mach-sa1100/assabet.c
   4 *
   5 * Author: Nicolas Pitre
   6 *
   7 * This file contains all Assabet-specific tweaks.
   8 */
   9#include <linux/init.h>
  10#include <linux/kernel.h>
  11#include <linux/module.h>
  12#include <linux/errno.h>
  13#include <linux/gpio/gpio-reg.h>
  14#include <linux/gpio/machine.h>
  15#include <linux/gpio_keys.h>
  16#include <linux/ioport.h>
  17#include <linux/platform_data/sa11x0-serial.h>
  18#include <linux/regulator/fixed.h>
  19#include <linux/regulator/machine.h>
  20#include <linux/serial_core.h>
  21#include <linux/platform_device.h>
  22#include <linux/mfd/ucb1x00.h>
  23#include <linux/mtd/mtd.h>
  24#include <linux/mtd/partitions.h>
  25#include <linux/delay.h>
  26#include <linux/mm.h>
  27#include <linux/leds.h>
  28#include <linux/slab.h>
  29
  30#include <video/sa1100fb.h>
  31
  32#include <mach/hardware.h>
  33#include <asm/mach-types.h>
  34#include <asm/setup.h>
  35#include <asm/page.h>
  36#include <asm/pgtable-hwdef.h>
  37#include <asm/tlbflush.h>
  38
  39#include <asm/mach/arch.h>
  40#include <asm/mach/flash.h>
  41#include <linux/platform_data/irda-sa11x0.h>
  42#include <asm/mach/map.h>
  43#include <mach/assabet.h>
  44#include <linux/platform_data/mfd-mcp-sa11x0.h>
  45#include <mach/irqs.h>
  46
  47#include "generic.h"
  48
  49#define ASSABET_BCR_DB1110 \
  50        (ASSABET_BCR_SPK_OFF    | \
  51         ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
  52         ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
  53         ASSABET_BCR_IRDA_MD0)
  54
  55#define ASSABET_BCR_DB1111 \
  56        (ASSABET_BCR_SPK_OFF    | \
  57         ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
  58         ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
  59         ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_STEREO_LB | \
  60         ASSABET_BCR_IRDA_MD0   | ASSABET_BCR_CF_RST)
  61
  62unsigned long SCR_value = ASSABET_SCR_INIT;
  63EXPORT_SYMBOL(SCR_value);
  64
  65static struct gpio_chip *assabet_bcr_gc;
  66
  67static const char *assabet_names[] = {
  68        "cf_pwr", "cf_gfx_reset", "nsoft_reset", "irda_fsel",
  69        "irda_md0", "irda_md1", "stereo_loopback", "ncf_bus_on",
  70        "audio_pwr_on", "light_pwr_on", "lcd16data", "lcd_pwr_on",
  71        "rs232_on", "nred_led", "ngreen_led", "vib_on",
  72        "com_dtr", "com_rts", "radio_wake_mod", "i2c_enab",
  73        "tvir_enab", "qmute", "radio_pwr_on", "spkr_off",
  74        "rs232_valid", "com_dcd", "com_cts", "com_dsr",
  75        "radio_cts", "radio_dsr", "radio_dcd", "radio_ri",
  76};
  77
  78/* The old deprecated interface */
  79void ASSABET_BCR_frob(unsigned int mask, unsigned int val)
  80{
  81        unsigned long m = mask, v = val;
  82
  83        assabet_bcr_gc->set_multiple(assabet_bcr_gc, &m, &v);
  84}
  85EXPORT_SYMBOL(ASSABET_BCR_frob);
  86
  87static int __init assabet_init_gpio(void __iomem *reg, u32 def_val)
  88{
  89        struct gpio_chip *gc;
  90
  91        writel_relaxed(def_val, reg);
  92
  93        gc = gpio_reg_init(NULL, reg, -1, 32, "assabet", 0xff000000, def_val,
  94                           assabet_names, NULL, NULL);
  95
  96        if (IS_ERR(gc))
  97                return PTR_ERR(gc);
  98
  99        assabet_bcr_gc = gc;
 100
 101        return gc->base;
 102}
 103
 104/*
 105 * The codec reset goes to three devices, so we need to release
 106 * the rest when any one of these requests it.  However, that
 107 * causes the ADV7171 to consume around 100mA - more than half
 108 * the LCD-blanked power.
 109 *
 110 * With the ADV7171, LCD and backlight enabled, we go over
 111 * budget on the MAX846 Li-Ion charger, and if no Li-Ion battery
 112 * is connected, the Assabet crashes.
 113 */
 114#define RST_UCB1X00 (1 << 0)
 115#define RST_UDA1341 (1 << 1)
 116#define RST_ADV7171 (1 << 2)
 117
 118#define SDA GPIO_GPIO(15)
 119#define SCK GPIO_GPIO(18)
 120#define MOD GPIO_GPIO(17)
 121
 122static void adv7171_start(void)
 123{
 124        GPSR = SCK;
 125        udelay(1);
 126        GPSR = SDA;
 127        udelay(2);
 128        GPCR = SDA;
 129}
 130
 131static void adv7171_stop(void)
 132{
 133        GPSR = SCK;
 134        udelay(2);
 135        GPSR = SDA;
 136        udelay(1);
 137}
 138
 139static void adv7171_send(unsigned byte)
 140{
 141        unsigned i;
 142
 143        for (i = 0; i < 8; i++, byte <<= 1) {
 144                GPCR = SCK;
 145                udelay(1);
 146                if (byte & 0x80)
 147                        GPSR = SDA;
 148                else
 149                        GPCR = SDA;
 150                udelay(1);
 151                GPSR = SCK;
 152                udelay(1);
 153        }
 154        GPCR = SCK;
 155        udelay(1);
 156        GPSR = SDA;
 157        udelay(1);
 158        GPDR &= ~SDA;
 159        GPSR = SCK;
 160        udelay(1);
 161        if (GPLR & SDA)
 162                printk(KERN_WARNING "No ACK from ADV7171\n");
 163        udelay(1);
 164        GPCR = SCK | SDA;
 165        udelay(1);
 166        GPDR |= SDA;
 167        udelay(1);
 168}
 169
 170static void adv7171_write(unsigned reg, unsigned val)
 171{
 172        unsigned gpdr = GPDR;
 173        unsigned gplr = GPLR;
 174
 175        ASSABET_BCR_frob(ASSABET_BCR_AUDIO_ON, ASSABET_BCR_AUDIO_ON);
 176        udelay(100);
 177
 178        GPCR = SDA | SCK | MOD; /* clear L3 mode to ensure UDA1341 doesn't respond */
 179        GPDR = (GPDR | SCK | MOD) & ~SDA;
 180        udelay(10);
 181        if (!(GPLR & SDA))
 182                printk(KERN_WARNING "Something dragging SDA down?\n");
 183        GPDR |= SDA;
 184
 185        adv7171_start();
 186        adv7171_send(0x54);
 187        adv7171_send(reg);
 188        adv7171_send(val);
 189        adv7171_stop();
 190
 191        /* Restore GPIO state for L3 bus */
 192        GPSR = gplr & (SDA | SCK | MOD);
 193        GPCR = (~gplr) & (SDA | SCK | MOD);
 194        GPDR = gpdr;
 195}
 196
 197static void adv7171_sleep(void)
 198{
 199        /* Put the ADV7171 into sleep mode */
 200        adv7171_write(0x04, 0x40);
 201}
 202
 203static unsigned codec_nreset;
 204
 205static void assabet_codec_reset(unsigned mask, int set)
 206{
 207        unsigned long flags;
 208        bool old;
 209
 210        local_irq_save(flags);
 211        old = !codec_nreset;
 212        if (set)
 213                codec_nreset &= ~mask;
 214        else
 215                codec_nreset |= mask;
 216
 217        if (old != !codec_nreset) {
 218                if (codec_nreset) {
 219                        ASSABET_BCR_set(ASSABET_BCR_NCODEC_RST);
 220                        adv7171_sleep();
 221                } else {
 222                        ASSABET_BCR_clear(ASSABET_BCR_NCODEC_RST);
 223                }
 224        }
 225        local_irq_restore(flags);
 226}
 227
 228static void assabet_ucb1x00_reset(enum ucb1x00_reset state)
 229{
 230        int set = state == UCB_RST_REMOVE || state == UCB_RST_SUSPEND ||
 231                state == UCB_RST_PROBE_FAIL;
 232        assabet_codec_reset(RST_UCB1X00, set);
 233}
 234
 235void assabet_uda1341_reset(int set)
 236{
 237        assabet_codec_reset(RST_UDA1341, set);
 238}
 239EXPORT_SYMBOL(assabet_uda1341_reset);
 240
 241
 242/*
 243 * Assabet flash support code.
 244 */
 245
 246#ifdef ASSABET_REV_4
 247/*
 248 * Phase 4 Assabet has two 28F160B3 flash parts in bank 0:
 249 */
 250static struct mtd_partition assabet_partitions[] = {
 251        {
 252                .name           = "bootloader",
 253                .size           = 0x00020000,
 254                .offset         = 0,
 255                .mask_flags     = MTD_WRITEABLE,
 256        }, {
 257                .name           = "bootloader params",
 258                .size           = 0x00020000,
 259                .offset         = MTDPART_OFS_APPEND,
 260                .mask_flags     = MTD_WRITEABLE,
 261        }, {
 262                .name           = "jffs",
 263                .size           = MTDPART_SIZ_FULL,
 264                .offset         = MTDPART_OFS_APPEND,
 265        }
 266};
 267#else
 268/*
 269 * Phase 5 Assabet has two 28F128J3A flash parts in bank 0:
 270 */
 271static struct mtd_partition assabet_partitions[] = {
 272        {
 273                .name           = "bootloader",
 274                .size           = 0x00040000,
 275                .offset         = 0,
 276                .mask_flags     = MTD_WRITEABLE,
 277        }, {
 278                .name           = "bootloader params",
 279                .size           = 0x00040000,
 280                .offset         = MTDPART_OFS_APPEND,
 281                .mask_flags     = MTD_WRITEABLE,
 282        }, {
 283                .name           = "jffs",
 284                .size           = MTDPART_SIZ_FULL,
 285                .offset         = MTDPART_OFS_APPEND,
 286        }
 287};
 288#endif
 289
 290static struct flash_platform_data assabet_flash_data = {
 291        .map_name       = "cfi_probe",
 292        .parts          = assabet_partitions,
 293        .nr_parts       = ARRAY_SIZE(assabet_partitions),
 294};
 295
 296static struct resource assabet_flash_resources[] = {
 297        DEFINE_RES_MEM(SA1100_CS0_PHYS, SZ_32M),
 298        DEFINE_RES_MEM(SA1100_CS1_PHYS, SZ_32M),
 299};
 300
 301
 302/*
 303 * Assabet IrDA support code.
 304 */
 305
 306static int assabet_irda_set_power(struct device *dev, unsigned int state)
 307{
 308        static unsigned int bcr_state[4] = {
 309                ASSABET_BCR_IRDA_MD0,
 310                ASSABET_BCR_IRDA_MD1|ASSABET_BCR_IRDA_MD0,
 311                ASSABET_BCR_IRDA_MD1,
 312                0
 313        };
 314
 315        if (state < 4)
 316                ASSABET_BCR_frob(ASSABET_BCR_IRDA_MD1 | ASSABET_BCR_IRDA_MD0,
 317                                 bcr_state[state]);
 318        return 0;
 319}
 320
 321static void assabet_irda_set_speed(struct device *dev, unsigned int speed)
 322{
 323        if (speed < 4000000)
 324                ASSABET_BCR_clear(ASSABET_BCR_IRDA_FSEL);
 325        else
 326                ASSABET_BCR_set(ASSABET_BCR_IRDA_FSEL);
 327}
 328
 329static struct irda_platform_data assabet_irda_data = {
 330        .set_power      = assabet_irda_set_power,
 331        .set_speed      = assabet_irda_set_speed,
 332};
 333
 334static struct ucb1x00_plat_data assabet_ucb1x00_data = {
 335        .reset          = assabet_ucb1x00_reset,
 336        .gpio_base      = -1,
 337        .can_wakeup     = 1,
 338};
 339
 340static struct mcp_plat_data assabet_mcp_data = {
 341        .mccr0          = MCCR0_ADM,
 342        .sclk_rate      = 11981000,
 343        .codec_pdata    = &assabet_ucb1x00_data,
 344};
 345
 346static void assabet_lcd_set_visual(u32 visual)
 347{
 348        u_int is_true_color = visual == FB_VISUAL_TRUECOLOR;
 349
 350        if (machine_is_assabet()) {
 351#if 1           // phase 4 or newer Assabet's
 352                if (is_true_color)
 353                        ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB);
 354                else
 355                        ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB);
 356#else
 357                // older Assabet's
 358                if (is_true_color)
 359                        ASSABET_BCR_clear(ASSABET_BCR_LCD_12RGB);
 360                else
 361                        ASSABET_BCR_set(ASSABET_BCR_LCD_12RGB);
 362#endif
 363        }
 364}
 365
 366#ifndef ASSABET_PAL_VIDEO
 367static void assabet_lcd_backlight_power(int on)
 368{
 369        if (on)
 370                ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON);
 371        else
 372                ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
 373}
 374
 375/*
 376 * Turn on/off the backlight.  When turning the backlight on, we wait
 377 * 500us after turning it on so we don't cause the supplies to droop
 378 * when we enable the LCD controller (and cause a hard reset.)
 379 */
 380static void assabet_lcd_power(int on)
 381{
 382        if (on) {
 383                ASSABET_BCR_set(ASSABET_BCR_LCD_ON);
 384                udelay(500);
 385        } else
 386                ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
 387}
 388
 389/*
 390 * The assabet uses a sharp LQ039Q2DS54 LCD module.  It is actually
 391 * takes an RGB666 signal, but we provide it with an RGB565 signal
 392 * instead (def_rgb_16).
 393 */
 394static struct sa1100fb_mach_info lq039q2ds54_info = {
 395        .pixclock       = 171521,       .bpp            = 16,
 396        .xres           = 320,          .yres           = 240,
 397
 398        .hsync_len      = 5,            .vsync_len      = 1,
 399        .left_margin    = 61,           .upper_margin   = 3,
 400        .right_margin   = 9,            .lower_margin   = 0,
 401
 402        .sync           = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
 403
 404        .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
 405        .lccr3          = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(2),
 406
 407        .backlight_power = assabet_lcd_backlight_power,
 408        .lcd_power = assabet_lcd_power,
 409        .set_visual = assabet_lcd_set_visual,
 410};
 411#else
 412static void assabet_pal_backlight_power(int on)
 413{
 414        ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
 415}
 416
 417static void assabet_pal_power(int on)
 418{
 419        ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
 420}
 421
 422static struct sa1100fb_mach_info pal_info = {
 423        .pixclock       = 67797,        .bpp            = 16,
 424        .xres           = 640,          .yres           = 512,
 425
 426        .hsync_len      = 64,           .vsync_len      = 6,
 427        .left_margin    = 125,          .upper_margin   = 70,
 428        .right_margin   = 115,          .lower_margin   = 36,
 429
 430        .lccr0          = LCCR0_Color | LCCR0_Sngl | LCCR0_Act,
 431        .lccr3          = LCCR3_OutEnH | LCCR3_PixRsEdg | LCCR3_ACBsDiv(512),
 432
 433        .backlight_power = assabet_pal_backlight_power,
 434        .lcd_power = assabet_pal_power,
 435        .set_visual = assabet_lcd_set_visual,
 436};
 437#endif
 438
 439#ifdef CONFIG_ASSABET_NEPONSET
 440static struct resource neponset_resources[] = {
 441        DEFINE_RES_MEM(0x10000000, 0x08000000),
 442        DEFINE_RES_MEM(0x18000000, 0x04000000),
 443        DEFINE_RES_MEM(0x40000000, SZ_8K),
 444        DEFINE_RES_IRQ(IRQ_GPIO25),
 445};
 446#endif
 447
 448static struct gpiod_lookup_table assabet_cf_gpio_table = {
 449        .dev_id = "sa11x0-pcmcia.1",
 450        .table = {
 451                GPIO_LOOKUP("gpio", 21, "ready", GPIO_ACTIVE_HIGH),
 452                GPIO_LOOKUP("gpio", 22, "detect", GPIO_ACTIVE_LOW),
 453                GPIO_LOOKUP("gpio", 24, "bvd2", GPIO_ACTIVE_HIGH),
 454                GPIO_LOOKUP("gpio", 25, "bvd1", GPIO_ACTIVE_HIGH),
 455                GPIO_LOOKUP("assabet", 1, "reset", GPIO_ACTIVE_HIGH),
 456                GPIO_LOOKUP("assabet", 7, "bus-enable", GPIO_ACTIVE_LOW),
 457                { },
 458        },
 459};
 460
 461static struct regulator_consumer_supply assabet_cf_vcc_consumers[] = {
 462        REGULATOR_SUPPLY("vcc", "sa11x0-pcmcia.1"),
 463};
 464
 465static struct fixed_voltage_config assabet_cf_vcc_pdata __initdata = {
 466        .supply_name = "cf-power",
 467        .microvolts = 3300000,
 468};
 469
 470static struct gpiod_lookup_table assabet_cf_vcc_gpio_table = {
 471        .dev_id = "reg-fixed-voltage.0",
 472        .table = {
 473                GPIO_LOOKUP("assabet", 0, NULL, GPIO_ACTIVE_HIGH),
 474                { },
 475        },
 476};
 477
 478static struct gpio_led assabet_leds[] __initdata = {
 479        {
 480                .name = "assabet:red",
 481                .default_trigger = "cpu0",
 482                .active_low = 1,
 483                .default_state = LEDS_GPIO_DEFSTATE_KEEP,
 484        }, {
 485                .name = "assabet:green",
 486                .default_trigger = "heartbeat",
 487                .active_low = 1,
 488                .default_state = LEDS_GPIO_DEFSTATE_KEEP,
 489        },
 490};
 491
 492static const struct gpio_led_platform_data assabet_leds_pdata __initconst = {
 493        .num_leds = ARRAY_SIZE(assabet_leds),
 494        .leds = assabet_leds,
 495};
 496
 497static struct gpio_keys_button assabet_keys_buttons[] = {
 498        {
 499                .gpio = 0,
 500                .irq = IRQ_GPIO0,
 501                .desc = "gpio0",
 502                .wakeup = 1,
 503                .can_disable = 1,
 504                .debounce_interval = 5,
 505        }, {
 506                .gpio = 1,
 507                .irq = IRQ_GPIO1,
 508                .desc = "gpio1",
 509                .wakeup = 1,
 510                .can_disable = 1,
 511                .debounce_interval = 5,
 512        },
 513};
 514
 515static const struct gpio_keys_platform_data assabet_keys_pdata = {
 516        .buttons = assabet_keys_buttons,
 517        .nbuttons = ARRAY_SIZE(assabet_keys_buttons),
 518        .rep = 0,
 519};
 520
 521static struct gpiod_lookup_table assabet_uart1_gpio_table = {
 522        .dev_id = "sa11x0-uart.1",
 523        .table = {
 524                GPIO_LOOKUP("assabet", 16, "dtr", GPIO_ACTIVE_LOW),
 525                GPIO_LOOKUP("assabet", 17, "rts", GPIO_ACTIVE_LOW),
 526                GPIO_LOOKUP("assabet", 25, "dcd", GPIO_ACTIVE_LOW),
 527                GPIO_LOOKUP("assabet", 26, "cts", GPIO_ACTIVE_LOW),
 528                GPIO_LOOKUP("assabet", 27, "dsr", GPIO_ACTIVE_LOW),
 529                { },
 530        },
 531};
 532
 533static struct gpiod_lookup_table assabet_uart3_gpio_table = {
 534        .dev_id = "sa11x0-uart.3",
 535        .table = {
 536                GPIO_LOOKUP("assabet", 28, "cts", GPIO_ACTIVE_LOW),
 537                GPIO_LOOKUP("assabet", 29, "dsr", GPIO_ACTIVE_LOW),
 538                GPIO_LOOKUP("assabet", 30, "dcd", GPIO_ACTIVE_LOW),
 539                GPIO_LOOKUP("assabet", 31, "rng", GPIO_ACTIVE_LOW),
 540                { },
 541        },
 542};
 543
 544static void __init assabet_init(void)
 545{
 546        /*
 547         * Ensure that the power supply is in "high power" mode.
 548         */
 549        GPSR = GPIO_GPIO16;
 550        GPDR |= GPIO_GPIO16;
 551
 552        /*
 553         * Ensure that these pins are set as outputs and are driving
 554         * logic 0.  This ensures that we won't inadvertently toggle
 555         * the WS latch in the CPLD, and we don't float causing
 556         * excessive power drain.  --rmk
 557         */
 558        GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 559        GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 560
 561        /*
 562         * Also set GPIO27 as an output; this is used to clock UART3
 563         * via the FPGA and as otherwise has no pullups or pulldowns,
 564         * so stop it floating.
 565         */
 566        GPCR = GPIO_GPIO27;
 567        GPDR |= GPIO_GPIO27;
 568
 569        /*
 570         * Set up registers for sleep mode.
 571         */
 572        PWER = PWER_GPIO0;
 573        PGSR = 0;
 574        PCFR = 0;
 575        PSDR = 0;
 576        PPDR |= PPC_TXD3 | PPC_TXD1;
 577        PPSR |= PPC_TXD3 | PPC_TXD1;
 578
 579        sa11x0_ppc_configure_mcp();
 580
 581        if (machine_has_neponset()) {
 582#ifndef CONFIG_ASSABET_NEPONSET
 583                printk( "Warning: Neponset detected but full support "
 584                        "hasn't been configured in the kernel\n" );
 585#else
 586                platform_device_register_simple("neponset", 0,
 587                        neponset_resources, ARRAY_SIZE(neponset_resources));
 588#endif
 589        } else {
 590                gpiod_add_lookup_table(&assabet_uart1_gpio_table);
 591                gpiod_add_lookup_table(&assabet_uart3_gpio_table);
 592                gpiod_add_lookup_table(&assabet_cf_vcc_gpio_table);
 593
 594                sa11x0_register_fixed_regulator(0, &assabet_cf_vcc_pdata,
 595                                        assabet_cf_vcc_consumers,
 596                                        ARRAY_SIZE(assabet_cf_vcc_consumers),
 597                                        true);
 598
 599        }
 600
 601        platform_device_register_resndata(NULL, "gpio-keys", 0,
 602                                          NULL, 0,
 603                                          &assabet_keys_pdata,
 604                                          sizeof(assabet_keys_pdata));
 605
 606        gpio_led_register_device(-1, &assabet_leds_pdata);
 607
 608#ifndef ASSABET_PAL_VIDEO
 609        sa11x0_register_lcd(&lq039q2ds54_info);
 610#else
 611        sa11x0_register_lcd(&pal_video);
 612#endif
 613        sa11x0_register_mtd(&assabet_flash_data, assabet_flash_resources,
 614                            ARRAY_SIZE(assabet_flash_resources));
 615        sa11x0_register_irda(&assabet_irda_data);
 616        sa11x0_register_mcp(&assabet_mcp_data);
 617
 618        if (!machine_has_neponset())
 619                sa11x0_register_pcmcia(1, &assabet_cf_gpio_table);
 620}
 621
 622/*
 623 * On Assabet, we must probe for the Neponset board _before_
 624 * paging_init() has occurred to actually determine the amount
 625 * of RAM available.  To do so, we map the appropriate IO section
 626 * in the page table here in order to access GPIO registers.
 627 */
 628static void __init map_sa1100_gpio_regs( void )
 629{
 630        unsigned long phys = __PREG(GPLR) & PMD_MASK;
 631        unsigned long virt = (unsigned long)io_p2v(phys);
 632        int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
 633        pmd_t *pmd;
 634
 635        pmd = pmd_off_k(virt);
 636        *pmd = __pmd(phys | prot);
 637        flush_pmd_entry(pmd);
 638}
 639
 640/*
 641 * Read System Configuration "Register"
 642 * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
 643 * User's Guide", section 4.4.1)
 644 *
 645 * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S
 646 * to set up the serial port for decompression status messages. We
 647 * repeat it here because the kernel may not be loaded as a zImage, and
 648 * also because it's a hassle to communicate the SCR value to the kernel
 649 * from the decompressor.
 650 *
 651 * Note that IRQs are guaranteed to be disabled.
 652 */
 653static void __init get_assabet_scr(void)
 654{
 655        unsigned long uninitialized_var(scr), i;
 656
 657        GPDR |= 0x3fc;                  /* Configure GPIO 9:2 as outputs */
 658        GPSR = 0x3fc;                   /* Write 0xFF to GPIO 9:2 */
 659        GPDR &= ~(0x3fc);               /* Configure GPIO 9:2 as inputs */
 660        for(i = 100; i--; )             /* Read GPIO 9:2 */
 661                scr = GPLR;
 662        GPDR |= 0x3fc;                  /*  restore correct pin direction */
 663        scr &= 0x3fc;                   /* save as system configuration byte. */
 664        SCR_value = scr;
 665}
 666
 667static void __init
 668fixup_assabet(struct tag *tags, char **cmdline)
 669{
 670        /* This must be done before any call to machine_has_neponset() */
 671        map_sa1100_gpio_regs();
 672        get_assabet_scr();
 673
 674        if (machine_has_neponset())
 675                printk("Neponset expansion board detected\n");
 676}
 677
 678
 679static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
 680{
 681        if (port->mapbase == _Ser1UTCR0) {
 682                if (state)
 683                        ASSABET_BCR_clear(ASSABET_BCR_RS232EN);
 684                else
 685                        ASSABET_BCR_set(ASSABET_BCR_RS232EN);
 686        }
 687}
 688
 689static struct sa1100_port_fns assabet_port_fns __initdata = {
 690        .pm             = assabet_uart_pm,
 691};
 692
 693static struct map_desc assabet_io_desc[] __initdata = {
 694        {       /* Board Control Register */
 695                .virtual        =  0xf1000000,
 696                .pfn            = __phys_to_pfn(0x12000000),
 697                .length         = 0x00100000,
 698                .type           = MT_DEVICE
 699        }, {    /* MQ200 */
 700                .virtual        =  0xf2800000,
 701                .pfn            = __phys_to_pfn(0x4b800000),
 702                .length         = 0x00800000,
 703                .type           = MT_DEVICE
 704        }
 705};
 706
 707static void __init assabet_map_io(void)
 708{
 709        sa1100_map_io();
 710        iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc));
 711
 712        /*
 713         * Set SUS bit in SDCR0 so serial port 1 functions.
 714         * Its called GPCLKR0 in my SA1110 manual.
 715         */
 716        Ser1SDCR0 |= SDCR0_SUS;
 717        MSC1 = (MSC1 & ~0xffff) |
 718                MSC_NonBrst | MSC_32BitStMem |
 719                MSC_RdAcc(2) | MSC_WrAcc(2) | MSC_Rec(0);
 720
 721        if (!machine_has_neponset())
 722                sa1100_register_uart_fns(&assabet_port_fns);
 723
 724        /*
 725         * When Neponset is attached, the first UART should be
 726         * UART3.  That's what Angel is doing and many documents
 727         * are stating this.
 728         *
 729         * We do the Neponset mapping even if Neponset support
 730         * isn't compiled in so the user will still get something on
 731         * the expected physical serial port.
 732         *
 733         * We no longer do this; not all boot loaders support it,
 734         * and UART3 appears to be somewhat unreliable with blob.
 735         */
 736        sa1100_register_uart(0, 1);
 737        sa1100_register_uart(2, 3);
 738}
 739
 740void __init assabet_init_irq(void)
 741{
 742        unsigned int assabet_gpio_base;
 743        u32 def_val;
 744
 745        sa1100_init_irq();
 746
 747        if (machine_has_neponset())
 748                def_val = ASSABET_BCR_DB1111;
 749        else
 750                def_val = ASSABET_BCR_DB1110;
 751
 752        /*
 753         * Angel sets this, but other bootloaders may not.
 754         *
 755         * This must precede any driver calls to BCR_set() or BCR_clear().
 756         */
 757        assabet_gpio_base = assabet_init_gpio((void *)&ASSABET_BCR, def_val);
 758
 759        assabet_leds[0].gpio = assabet_gpio_base + 13;
 760        assabet_leds[1].gpio = assabet_gpio_base + 14;
 761}
 762
 763MACHINE_START(ASSABET, "Intel-Assabet")
 764        .atag_offset    = 0x100,
 765        .fixup          = fixup_assabet,
 766        .map_io         = assabet_map_io,
 767        .nr_irqs        = SA1100_NR_IRQS,
 768        .init_irq       = assabet_init_irq,
 769        .init_time      = sa1100_timer_init,
 770        .init_machine   = assabet_init,
 771        .init_late      = sa11x0_init_late,
 772#ifdef CONFIG_SA1111
 773        .dma_zone_size  = SZ_1M,
 774#endif
 775        .restart        = sa11x0_restart,
 776MACHINE_END
 777