arch/arm/mach-sa1100/assabet.c

   1 /*
   2  * linux/arch/arm/mach-sa1100/assabet.c
   3  *
   4  * Author: Nicolas Pitre
   5  *
   6  * This file contains all Assabet-specific tweaks.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/errno.h>
  16 #include <linux/ioport.h>
  17 #include <linux/serial_core.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/partitions.h>
  20 #include <linux/delay.h>
  21 #include <linux/mm.h>
  22
  23 #include <mach/hardware.h>
  24 #include <asm/mach-types.h>
  25 #include <asm/irq.h>
  26 #include <asm/setup.h>
  27 #include <asm/page.h>
  28 #include <asm/pgtable-hwdef.h>
  29 #include <asm/pgtable.h>
  30 #include <asm/tlbflush.h>
  31
  32 #include <asm/mach/arch.h>
  33 #include <asm/mach/flash.h>
  34 #include <asm/mach/irda.h>
  35 #include <asm/mach/map.h>
  36 #include <asm/mach/serial_sa1100.h>
  37 #include <mach/assabet.h>
  38 #include <mach/mcp.h>
  39
  40 #include "generic.h"
  41
  42 #define ASSABET_BCR_DB1110 \
  43         (ASSABET_BCR_SPK_OFF    | ASSABET_BCR_QMUTE     | \
  44          ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
  45          ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
  46          ASSABET_BCR_IRDA_MD0)
  47
  48 #define ASSABET_BCR_DB1111 \
  49         (ASSABET_BCR_SPK_OFF    | ASSABET_BCR_QMUTE     | \
  50          ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
  51          ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
  52          ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_STEREO_LB | \
  53          ASSABET_BCR_IRDA_MD0   | ASSABET_BCR_CF_RST)
  54
  55 unsigned long SCR_value = ASSABET_SCR_INIT;
  56 EXPORT_SYMBOL(SCR_value);
  57
  58 static unsigned long BCR_value = ASSABET_BCR_DB1110;
  59
  60 void ASSABET_BCR_frob(unsigned int mask, unsigned int val)
  61 {
  62         unsigned long flags;
  63
  64         local_irq_save(flags);
  65         BCR_value = (BCR_value & ~mask) | val;
  66         ASSABET_BCR = BCR_value;
  67         local_irq_restore(flags);
  68 }
  69
  70 EXPORT_SYMBOL(ASSABET_BCR_frob);
  71
  72 static void assabet_backlight_power(int on)
  73 {
  74 #ifndef ASSABET_PAL_VIDEO
  75         if (on)
  76                 ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON);
  77         else
  78 #endif
  79                 ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
  80 }
  81
  82 /*
  83  * Turn on/off the backlight.  When turning the backlight on,
  84  * we wait 500us after turning it on so we don't cause the
  85  * supplies to droop when we enable the LCD controller (and
  86  * cause a hard reset.)
  87  */
  88 static void assabet_lcd_power(int on)
  89 {
  90 #ifndef ASSABET_PAL_VIDEO
  91         if (on) {
  92                 ASSABET_BCR_set(ASSABET_BCR_LCD_ON);
  93                 udelay(500);
  94         } else
  95 #endif
  96                 ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
  97 }
  98
  99
 100 /*
 101  * Assabet flash support code.
 102  */
 103
 104 #ifdef ASSABET_REV_4
 105 /*
 106  * Phase 4 Assabet has two 28F160B3 flash parts in bank 0:
 107  */
 108 static struct mtd_partition assabet_partitions[] = {
 109         {
 110                 .name           = "bootloader",
 111                 .size           = 0x00020000,
 112                 .offset         = 0,
 113                 .mask_flags     = MTD_WRITEABLE,
 114         }, {
 115                 .name           = "bootloader params",
 116                 .size           = 0x00020000,
 117                 .offset         = MTDPART_OFS_APPEND,
 118                 .mask_flags     = MTD_WRITEABLE,
 119         }, {
 120                 .name           = "jffs",
 121                 .size           = MTDPART_SIZ_FULL,
 122                 .offset         = MTDPART_OFS_APPEND,
 123         }
 124 };
 125 #else
 126 /*
 127  * Phase 5 Assabet has two 28F128J3A flash parts in bank 0:
 128  */
 129 static struct mtd_partition assabet_partitions[] = {
 130         {
 131                 .name           = "bootloader",
 132                 .size           = 0x00040000,
 133                 .offset         = 0,
 134                 .mask_flags     = MTD_WRITEABLE,
 135         }, {
 136                 .name           = "bootloader params",
 137                 .size           = 0x00040000,
 138                 .offset         = MTDPART_OFS_APPEND,
 139                 .mask_flags     = MTD_WRITEABLE,
 140         }, {
 141                 .name           = "jffs",
 142                 .size           = MTDPART_SIZ_FULL,
 143                 .offset         = MTDPART_OFS_APPEND,
 144         }
 145 };
 146 #endif
 147
 148 static struct flash_platform_data assabet_flash_data = {
 149         .map_name       = "cfi_probe",
 150         .parts          = assabet_partitions,
 151         .nr_parts       = ARRAY_SIZE(assabet_partitions),
 152 };
 153
 154 static struct resource assabet_flash_resources[] = {
 155         {
 156                 .start  = SA1100_CS0_PHYS,
 157                 .end    = SA1100_CS0_PHYS + SZ_32M - 1,
 158                 .flags  = IORESOURCE_MEM,
 159         }, {
 160                 .start  = SA1100_CS1_PHYS,
 161                 .end    = SA1100_CS1_PHYS + SZ_32M - 1,
 162                 .flags  = IORESOURCE_MEM,
 163         }
 164 };
 165
 166
 167 /*
 168  * Assabet IrDA support code.
 169  */
 170
 171 static int assabet_irda_set_power(struct device *dev, unsigned int state)
 172 {
 173         static unsigned int bcr_state[4] = {
 174                 ASSABET_BCR_IRDA_MD0,
 175                 ASSABET_BCR_IRDA_MD1|ASSABET_BCR_IRDA_MD0,
 176                 ASSABET_BCR_IRDA_MD1,
 177                 0
 178         };
 179
 180         if (state < 4) {
 181                 state = bcr_state[state];
 182                 ASSABET_BCR_clear(state ^ (ASSABET_BCR_IRDA_MD1|
 183                                            ASSABET_BCR_IRDA_MD0));
 184                 ASSABET_BCR_set(state);
 185         }
 186         return 0;
 187 }
 188
 189 static void assabet_irda_set_speed(struct device *dev, unsigned int speed)
 190 {
 191         if (speed < 4000000)
 192                 ASSABET_BCR_clear(ASSABET_BCR_IRDA_FSEL);
 193         else
 194                 ASSABET_BCR_set(ASSABET_BCR_IRDA_FSEL);
 195 }
 196
 197 static struct irda_platform_data assabet_irda_data = {
 198         .set_power      = assabet_irda_set_power,
 199         .set_speed      = assabet_irda_set_speed,
 200 };
 201
 202 static struct mcp_plat_data assabet_mcp_data = {
 203         .mccr0          = MCCR0_ADM,
 204         .sclk_rate      = 11981000,
 205         .codec          = "ucb1x00",
 206 };
 207
 208 static void __init assabet_init(void)
 209 {
 210         /*
 211          * Ensure that the power supply is in "high power" mode.
 212          */
 213         GPDR |= GPIO_GPIO16;
 214         GPSR = GPIO_GPIO16;
 215
 216         /*
 217          * Ensure that these pins are set as outputs and are driving
 218          * logic 0.  This ensures that we won't inadvertently toggle
 219          * the WS latch in the CPLD, and we don't float causing
 220          * excessive power drain.  --rmk
 221          */
 222         GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 223         GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 224
 225         /*
 226          * Set up registers for sleep mode.
 227          */
 228         PWER = PWER_GPIO0;
 229         PGSR = 0;
 230         PCFR = 0;
 231         PSDR = 0;
 232         PPDR |= PPC_TXD3 | PPC_TXD1;
 233         PPSR |= PPC_TXD3 | PPC_TXD1;
 234
 235         sa1100fb_lcd_power = assabet_lcd_power;
 236         sa1100fb_backlight_power = assabet_backlight_power;
 237
 238         if (machine_has_neponset()) {
 239                 /*
 240                  * Angel sets this, but other bootloaders may not.
 241                  *
 242                  * This must precede any driver calls to BCR_set()
 243                  * or BCR_clear().
 244                  */
 245                 ASSABET_BCR = BCR_value = ASSABET_BCR_DB1111;
 246
 247 #ifndef CONFIG_ASSABET_NEPONSET
 248                 printk( "Warning: Neponset detected but full support "
 249                         "hasn't been configured in the kernel\n" );
 250 #endif
 251         }
 252
 253         sa11x0_register_mtd(&assabet_flash_data, assabet_flash_resources,
 254                             ARRAY_SIZE(assabet_flash_resources));
 255         sa11x0_register_irda(&assabet_irda_data);
 256
 257         /*
 258          * Setup the PPC unit correctly.
 259          */
 260         PPDR &= ~PPC_RXD4;
 261         PPDR |= PPC_TXD4 | PPC_SCLK | PPC_SFRM;
 262         PSDR |= PPC_RXD4;
 263         PSDR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
 264         PPSR &= ~(PPC_TXD4 | PPC_SCLK | PPC_SFRM);
 265
 266         ASSABET_BCR_set(ASSABET_BCR_CODEC_RST);
 267         sa11x0_register_mcp(&assabet_mcp_data);
 268 }
 269
 270 /*
 271  * On Assabet, we must probe for the Neponset board _before_
 272  * paging_init() has occurred to actually determine the amount
 273  * of RAM available.  To do so, we map the appropriate IO section
 274  * in the page table here in order to access GPIO registers.
 275  */
 276 static void __init map_sa1100_gpio_regs( void )
 277 {
 278         unsigned long phys = __PREG(GPLR) & PMD_MASK;
 279         unsigned long virt = io_p2v(phys);
 280         int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
 281         pmd_t *pmd;
 282
 283         pmd = pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
 284         *pmd = __pmd(phys | prot);
 285         flush_pmd_entry(pmd);
 286 }
 287
 288 /*
 289  * Read System Configuration "Register"
 290  * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
 291  * User's Guide", section 4.4.1)
 292  *
 293  * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S
 294  * to set up the serial port for decompression status messages. We
 295  * repeat it here because the kernel may not be loaded as a zImage, and
 296  * also because it's a hassle to communicate the SCR value to the kernel
 297  * from the decompressor.
 298  *
 299  * Note that IRQs are guaranteed to be disabled.
 300  */
 301 static void __init get_assabet_scr(void)
 302 {
 303         unsigned long scr, i;
 304
 305         GPDR |= 0x3fc;                  /* Configure GPIO 9:2 as outputs */
 306         GPSR = 0x3fc;                   /* Write 0xFF to GPIO 9:2 */
 307         GPDR &= ~(0x3fc);               /* Configure GPIO 9:2 as inputs */
 308         for(i = 100; i--; )             /* Read GPIO 9:2 */
 309                 scr = GPLR;
 310         GPDR |= 0x3fc;                  /*  restore correct pin direction */
 311         scr &= 0x3fc;                   /* save as system configuration byte. */
 312         SCR_value = scr;
 313 }
 314
 315 static void __init
 316 fixup_assabet(struct tag *tags, char **cmdline, struct meminfo *mi)
 317 {
 318         /* This must be done before any call to machine_has_neponset() */
 319         map_sa1100_gpio_regs();
 320         get_assabet_scr();
 321
 322         if (machine_has_neponset())
 323                 printk("Neponset expansion board detected\n");
 324 }
 325
 326
 327 static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
 328 {
 329         if (port->mapbase == _Ser1UTCR0) {
 330                 if (state)
 331                         ASSABET_BCR_clear(ASSABET_BCR_RS232EN |
 332                                           ASSABET_BCR_COM_RTS |
 333                                           ASSABET_BCR_COM_DTR);
 334                 else
 335                         ASSABET_BCR_set(ASSABET_BCR_RS232EN |
 336                                         ASSABET_BCR_COM_RTS |
 337                                         ASSABET_BCR_COM_DTR);
 338         }
 339 }
 340
 341 /*
 342  * Assabet uses COM_RTS and COM_DTR for both UART1 (com port)
 343  * and UART3 (radio module).  We only handle them for UART1 here.
 344  */
 345 static void assabet_set_mctrl(struct uart_port *port, u_int mctrl)
 346 {
 347         if (port->mapbase == _Ser1UTCR0) {
 348                 u_int set = 0, clear = 0;
 349
 350                 if (mctrl & TIOCM_RTS)
 351                         clear |= ASSABET_BCR_COM_RTS;
 352                 else
 353                         set |= ASSABET_BCR_COM_RTS;
 354
 355                 if (mctrl & TIOCM_DTR)
 356                         clear |= ASSABET_BCR_COM_DTR;
 357                 else
 358                         set |= ASSABET_BCR_COM_DTR;
 359
 360                 ASSABET_BCR_clear(clear);
 361                 ASSABET_BCR_set(set);
 362         }
 363 }
 364
 365 static u_int assabet_get_mctrl(struct uart_port *port)
 366 {
 367         u_int ret = 0;
 368         u_int bsr = ASSABET_BSR;
 369
 370         /* need 2 reads to read current value */
 371         bsr = ASSABET_BSR;
 372
 373         if (port->mapbase == _Ser1UTCR0) {
 374                 if (bsr & ASSABET_BSR_COM_DCD)
 375                         ret |= TIOCM_CD;
 376                 if (bsr & ASSABET_BSR_COM_CTS)
 377                         ret |= TIOCM_CTS;
 378                 if (bsr & ASSABET_BSR_COM_DSR)
 379                         ret |= TIOCM_DSR;
 380         } else if (port->mapbase == _Ser3UTCR0) {
 381                 if (bsr & ASSABET_BSR_RAD_DCD)
 382                         ret |= TIOCM_CD;
 383                 if (bsr & ASSABET_BSR_RAD_CTS)
 384                         ret |= TIOCM_CTS;
 385                 if (bsr & ASSABET_BSR_RAD_DSR)
 386                         ret |= TIOCM_DSR;
 387                 if (bsr & ASSABET_BSR_RAD_RI)
 388                         ret |= TIOCM_RI;
 389         } else {
 390                 ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
 391         }
 392
 393         return ret;
 394 }
 395
 396 static struct sa1100_port_fns assabet_port_fns __initdata = {
 397         .set_mctrl      = assabet_set_mctrl,
 398         .get_mctrl      = assabet_get_mctrl,
 399         .pm             = assabet_uart_pm,
 400 };
 401
 402 static struct map_desc assabet_io_desc[] __initdata = {
 403         {       /* Board Control Register */
 404                 .virtual        =  0xf1000000,
 405                 .pfn            = __phys_to_pfn(0x12000000),
 406                 .length         = 0x00100000,
 407                 .type           = MT_DEVICE
 408         }, {    /* MQ200 */
 409                 .virtual        =  0xf2800000,
 410                 .pfn            = __phys_to_pfn(0x4b800000),
 411                 .length         = 0x00800000,
 412                 .type           = MT_DEVICE
 413         }
 414 };
 415
 416 static void __init assabet_map_io(void)
 417 {
 418         sa1100_map_io();
 419         iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc));
 420
 421         /*
 422          * Set SUS bit in SDCR0 so serial port 1 functions.
 423          * Its called GPCLKR0 in my SA1110 manual.
 424          */
 425         Ser1SDCR0 |= SDCR0_SUS;
 426
 427         if (machine_has_neponset()) {
 428 #ifdef CONFIG_ASSABET_NEPONSET
 429                 extern void neponset_map_io(void);
 430
 431                 /*
 432                  * We map Neponset registers even if it isn't present since
 433                  * many drivers will try to probe their stuff (and fail).
 434                  * This is still more friendly than a kernel paging request
 435                  * crash.
 436                  */
 437                 neponset_map_io();
 438 #endif
 439         } else {
 440                 sa1100_register_uart_fns(&assabet_port_fns);
 441         }
 442
 443         /*
 444          * When Neponset is attached, the first UART should be
 445          * UART3.  That's what Angel is doing and many documents
 446          * are stating this.
 447          *
 448          * We do the Neponset mapping even if Neponset support
 449          * isn't compiled in so the user will still get something on
 450          * the expected physical serial port.
 451          *
 452          * We no longer do this; not all boot loaders support it,
 453          * and UART3 appears to be somewhat unreliable with blob.
 454          */
 455         sa1100_register_uart(0, 1);
 456         sa1100_register_uart(2, 3);
 457 }
 458
 459
 460 MACHINE_START(ASSABET, "Intel-Assabet")
 461         .atag_offset    = 0x100,
 462         .fixup          = fixup_assabet,
 463         .map_io         = assabet_map_io,
 464         .init_irq       = sa1100_init_irq,
 465         .timer          = &sa1100_timer,
 466         .init_machine   = assabet_init,
 467 #ifdef CONFIG_SA1111
 468         .dma_zone_size  = SZ_1M,
 469 #endif
 470         .restart        = sa11x0_restart,
 471 MACHINE_END