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 };
 206
 207 static void __init assabet_init(void)
 208 {
 209         /*
 210          * Ensure that the power supply is in "high power" mode.
 211          */
 212         GPDR |= GPIO_GPIO16;
 213         GPSR = GPIO_GPIO16;
 214
 215         /*
 216          * Ensure that these pins are set as outputs and are driving
 217          * logic 0.  This ensures that we won't inadvertently toggle
 218          * the WS latch in the CPLD, and we don't float causing
 219          * excessive power drain.  --rmk
 220          */
 221         GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 222         GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 223
 224         /*
 225          * Set up registers for sleep mode.
 226          */
 227         PWER = PWER_GPIO0;
 228         PGSR = 0;
 229         PCFR = 0;
 230         PSDR = 0;
 231         PPDR |= PPC_TXD3 | PPC_TXD1;
 232         PPSR |= PPC_TXD3 | PPC_TXD1;
 233
 234         sa1100fb_lcd_power = assabet_lcd_power;
 235         sa1100fb_backlight_power = assabet_backlight_power;
 236
 237         if (machine_has_neponset()) {
 238                 /*
 239                  * Angel sets this, but other bootloaders may not.
 240                  *
 241                  * This must precede any driver calls to BCR_set()
 242                  * or BCR_clear().
 243                  */
 244                 ASSABET_BCR = BCR_value = ASSABET_BCR_DB1111;
 245
 246 #ifndef CONFIG_ASSABET_NEPONSET
 247                 printk( "Warning: Neponset detected but full support "
 248                         "hasn't been configured in the kernel\n" );
 249 #endif
 250         }
 251
 252         sa11x0_register_mtd(&assabet_flash_data, assabet_flash_resources,
 253                             ARRAY_SIZE(assabet_flash_resources));
 254         sa11x0_register_irda(&assabet_irda_data);
 255         sa11x0_register_mcp(&assabet_mcp_data);
 256 }
 257
 258 /*
 259  * On Assabet, we must probe for the Neponset board _before_
 260  * paging_init() has occurred to actually determine the amount
 261  * of RAM available.  To do so, we map the appropriate IO section
 262  * in the page table here in order to access GPIO registers.
 263  */
 264 static void __init map_sa1100_gpio_regs( void )
 265 {
 266         unsigned long phys = __PREG(GPLR) & PMD_MASK;
 267         unsigned long virt = io_p2v(phys);
 268         int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
 269         pmd_t *pmd;
 270
 271         pmd = pmd_offset(pud_offset(pgd_offset_k(virt), virt), virt);
 272         *pmd = __pmd(phys | prot);
 273         flush_pmd_entry(pmd);
 274 }
 275
 276 /*
 277  * Read System Configuration "Register"
 278  * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
 279  * User's Guide", section 4.4.1)
 280  *
 281  * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S
 282  * to set up the serial port for decompression status messages. We
 283  * repeat it here because the kernel may not be loaded as a zImage, and
 284  * also because it's a hassle to communicate the SCR value to the kernel
 285  * from the decompressor.
 286  *
 287  * Note that IRQs are guaranteed to be disabled.
 288  */
 289 static void __init get_assabet_scr(void)
 290 {
 291         unsigned long scr, i;
 292
 293         GPDR |= 0x3fc;                  /* Configure GPIO 9:2 as outputs */
 294         GPSR = 0x3fc;                   /* Write 0xFF to GPIO 9:2 */
 295         GPDR &= ~(0x3fc);               /* Configure GPIO 9:2 as inputs */
 296         for(i = 100; i--; )             /* Read GPIO 9:2 */
 297                 scr = GPLR;
 298         GPDR |= 0x3fc;                  /*  restore correct pin direction */
 299         scr &= 0x3fc;                   /* save as system configuration byte. */
 300         SCR_value = scr;
 301 }
 302
 303 static void __init
 304 fixup_assabet(struct tag *tags, char **cmdline, struct meminfo *mi)
 305 {
 306         /* This must be done before any call to machine_has_neponset() */
 307         map_sa1100_gpio_regs();
 308         get_assabet_scr();
 309
 310         if (machine_has_neponset())
 311                 printk("Neponset expansion board detected\n");
 312 }
 313
 314
 315 static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
 316 {
 317         if (port->mapbase == _Ser1UTCR0) {
 318                 if (state)
 319                         ASSABET_BCR_clear(ASSABET_BCR_RS232EN |
 320                                           ASSABET_BCR_COM_RTS |
 321                                           ASSABET_BCR_COM_DTR);
 322                 else
 323                         ASSABET_BCR_set(ASSABET_BCR_RS232EN |
 324                                         ASSABET_BCR_COM_RTS |
 325                                         ASSABET_BCR_COM_DTR);
 326         }
 327 }
 328
 329 /*
 330  * Assabet uses COM_RTS and COM_DTR for both UART1 (com port)
 331  * and UART3 (radio module).  We only handle them for UART1 here.
 332  */
 333 static void assabet_set_mctrl(struct uart_port *port, u_int mctrl)
 334 {
 335         if (port->mapbase == _Ser1UTCR0) {
 336                 u_int set = 0, clear = 0;
 337
 338                 if (mctrl & TIOCM_RTS)
 339                         clear |= ASSABET_BCR_COM_RTS;
 340                 else
 341                         set |= ASSABET_BCR_COM_RTS;
 342
 343                 if (mctrl & TIOCM_DTR)
 344                         clear |= ASSABET_BCR_COM_DTR;
 345                 else
 346                         set |= ASSABET_BCR_COM_DTR;
 347
 348                 ASSABET_BCR_clear(clear);
 349                 ASSABET_BCR_set(set);
 350         }
 351 }
 352
 353 static u_int assabet_get_mctrl(struct uart_port *port)
 354 {
 355         u_int ret = 0;
 356         u_int bsr = ASSABET_BSR;
 357
 358         /* need 2 reads to read current value */
 359         bsr = ASSABET_BSR;
 360
 361         if (port->mapbase == _Ser1UTCR0) {
 362                 if (bsr & ASSABET_BSR_COM_DCD)
 363                         ret |= TIOCM_CD;
 364                 if (bsr & ASSABET_BSR_COM_CTS)
 365                         ret |= TIOCM_CTS;
 366                 if (bsr & ASSABET_BSR_COM_DSR)
 367                         ret |= TIOCM_DSR;
 368         } else if (port->mapbase == _Ser3UTCR0) {
 369                 if (bsr & ASSABET_BSR_RAD_DCD)
 370                         ret |= TIOCM_CD;
 371                 if (bsr & ASSABET_BSR_RAD_CTS)
 372                         ret |= TIOCM_CTS;
 373                 if (bsr & ASSABET_BSR_RAD_DSR)
 374                         ret |= TIOCM_DSR;
 375                 if (bsr & ASSABET_BSR_RAD_RI)
 376                         ret |= TIOCM_RI;
 377         } else {
 378                 ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
 379         }
 380
 381         return ret;
 382 }
 383
 384 static struct sa1100_port_fns assabet_port_fns __initdata = {
 385         .set_mctrl      = assabet_set_mctrl,
 386         .get_mctrl      = assabet_get_mctrl,
 387         .pm             = assabet_uart_pm,
 388 };
 389
 390 static struct map_desc assabet_io_desc[] __initdata = {
 391         {       /* Board Control Register */
 392                 .virtual        =  0xf1000000,
 393                 .pfn            = __phys_to_pfn(0x12000000),
 394                 .length         = 0x00100000,
 395                 .type           = MT_DEVICE
 396         }, {    /* MQ200 */
 397                 .virtual        =  0xf2800000,
 398                 .pfn            = __phys_to_pfn(0x4b800000),
 399                 .length         = 0x00800000,
 400                 .type           = MT_DEVICE
 401         }
 402 };
 403
 404 static void __init assabet_map_io(void)
 405 {
 406         sa1100_map_io();
 407         iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc));
 408
 409         /*
 410          * Set SUS bit in SDCR0 so serial port 1 functions.
 411          * Its called GPCLKR0 in my SA1110 manual.
 412          */
 413         Ser1SDCR0 |= SDCR0_SUS;
 414
 415         if (machine_has_neponset()) {
 416 #ifdef CONFIG_ASSABET_NEPONSET
 417                 extern void neponset_map_io(void);
 418
 419                 /*
 420                  * We map Neponset registers even if it isn't present since
 421                  * many drivers will try to probe their stuff (and fail).
 422                  * This is still more friendly than a kernel paging request
 423                  * crash.
 424                  */
 425                 neponset_map_io();
 426 #endif
 427         } else {
 428                 sa1100_register_uart_fns(&assabet_port_fns);
 429         }
 430
 431         /*
 432          * When Neponset is attached, the first UART should be
 433          * UART3.  That's what Angel is doing and many documents
 434          * are stating this.
 435          *
 436          * We do the Neponset mapping even if Neponset support
 437          * isn't compiled in so the user will still get something on
 438          * the expected physical serial port.
 439          *
 440          * We no longer do this; not all boot loaders support it,
 441          * and UART3 appears to be somewhat unreliable with blob.
 442          */
 443         sa1100_register_uart(0, 1);
 444         sa1100_register_uart(2, 3);
 445 }
 446
 447
 448 MACHINE_START(ASSABET, "Intel-Assabet")
 449         .atag_offset    = 0x100,
 450         .fixup          = fixup_assabet,
 451         .map_io         = assabet_map_io,
 452         .init_irq       = sa1100_init_irq,
 453         .timer          = &sa1100_timer,
 454         .init_machine   = assabet_init,
 455 #ifdef CONFIG_SA1111
 456         .dma_zone_size  = SZ_1M,
 457 #endif
 458         .restart        = sa11x0_restart,
 459 MACHINE_END