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/config.h>
  13 #include <linux/init.h>
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/ioport.h>
  18 #include <linux/serial_core.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/partitions.h>
  21 #include <linux/delay.h>
  22 #include <linux/mm.h>
  23
  24 #include <asm/hardware.h>
  25 #include <asm/mach-types.h>
  26 #include <asm/irq.h>
  27 #include <asm/setup.h>
  28 #include <asm/page.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 <asm/arch/assabet.h>
  38
  39 #include "generic.h"
  40
  41 #define ASSABET_BCR_DB1110 \
  42         (ASSABET_BCR_SPK_OFF    | ASSABET_BCR_QMUTE     | \
  43          ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
  44          ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
  45          ASSABET_BCR_IRDA_MD0)
  46
  47 #define ASSABET_BCR_DB1111 \
  48         (ASSABET_BCR_SPK_OFF    | ASSABET_BCR_QMUTE     | \
  49          ASSABET_BCR_LED_GREEN  | ASSABET_BCR_LED_RED   | \
  50          ASSABET_BCR_RS232EN    | ASSABET_BCR_LCD_12RGB | \
  51          ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_STEREO_LB | \
  52          ASSABET_BCR_IRDA_MD0   | ASSABET_BCR_CF_RST)
  53
  54 unsigned long SCR_value = ASSABET_SCR_INIT;
  55 EXPORT_SYMBOL(SCR_value);
  56
  57 static unsigned long BCR_value = ASSABET_BCR_DB1110;
  58
  59 void ASSABET_BCR_frob(unsigned int mask, unsigned int val)
  60 {
  61         unsigned long flags;
  62
  63         local_irq_save(flags);
  64         BCR_value = (BCR_value & ~mask) | val;
  65         ASSABET_BCR = BCR_value;
  66         local_irq_restore(flags);
  67 }
  68
  69 EXPORT_SYMBOL(ASSABET_BCR_frob);
  70
  71 static void assabet_backlight_power(int on)
  72 {
  73 #ifndef ASSABET_PAL_VIDEO
  74         if (on)
  75                 ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON);
  76         else
  77 #endif
  78                 ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
  79 }
  80
  81 /*
  82  * Turn on/off the backlight.  When turning the backlight on,
  83  * we wait 500us after turning it on so we don't cause the
  84  * supplies to droop when we enable the LCD controller (and
  85  * cause a hard reset.)
  86  */
  87 static void assabet_lcd_power(int on)
  88 {
  89 #ifndef ASSABET_PAL_VIDEO
  90         if (on) {
  91                 ASSABET_BCR_set(ASSABET_BCR_LCD_ON);
  92                 udelay(500);
  93         } else
  94 #endif
  95                 ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
  96 }
  97
  98
  99 /*
 100  * Assabet flash support code.
 101  */
 102
 103 #ifdef ASSABET_REV_4
 104 /*
 105  * Phase 4 Assabet has two 28F160B3 flash parts in bank 0:
 106  */
 107 static struct mtd_partition assabet_partitions[] = {
 108         {
 109                 .name           = "bootloader",
 110                 .size           = 0x00020000,
 111                 .offset         = 0,
 112                 .mask_flags     = MTD_WRITEABLE,
 113         }, {
 114                 .name           = "bootloader params",
 115                 .size           = 0x00020000,
 116                 .offset         = MTDPART_OFS_APPEND,
 117                 .mask_flags     = MTD_WRITEABLE,
 118         }, {
 119                 .name           = "jffs",
 120                 .size           = MTDPART_SIZ_FULL,
 121                 .offset         = MTDPART_OFS_APPEND,
 122         }
 123 };
 124 #else
 125 /*
 126  * Phase 5 Assabet has two 28F128J3A flash parts in bank 0:
 127  */
 128 static struct mtd_partition assabet_partitions[] = {
 129         {
 130                 .name           = "bootloader",
 131                 .size           = 0x00040000,
 132                 .offset         = 0,
 133                 .mask_flags     = MTD_WRITEABLE,
 134         }, {
 135                 .name           = "bootloader params",
 136                 .size           = 0x00040000,
 137                 .offset         = MTDPART_OFS_APPEND,
 138                 .mask_flags     = MTD_WRITEABLE,
 139         }, {
 140                 .name           = "jffs",
 141                 .size           = MTDPART_SIZ_FULL,
 142                 .offset         = MTDPART_OFS_APPEND,
 143         }
 144 };
 145 #endif
 146
 147 static struct flash_platform_data assabet_flash_data = {
 148         .map_name       = "cfi_probe",
 149         .parts          = assabet_partitions,
 150         .nr_parts       = ARRAY_SIZE(assabet_partitions),
 151 };
 152
 153 static struct resource assabet_flash_resources[] = {
 154         {
 155                 .start  = SA1100_CS0_PHYS,
 156                 .end    = SA1100_CS0_PHYS + SZ_32M - 1,
 157                 .flags  = IORESOURCE_MEM,
 158         }, {
 159                 .start  = SA1100_CS1_PHYS,
 160                 .end    = SA1100_CS1_PHYS + SZ_32M - 1,
 161                 .flags  = IORESOURCE_MEM,
 162         }
 163 };
 164
 165
 166 /*
 167  * Assabet IrDA support code.
 168  */
 169
 170 static int assabet_irda_set_power(struct device *dev, unsigned int state)
 171 {
 172         static unsigned int bcr_state[4] = {
 173                 ASSABET_BCR_IRDA_MD0,
 174                 ASSABET_BCR_IRDA_MD1|ASSABET_BCR_IRDA_MD0,
 175                 ASSABET_BCR_IRDA_MD1,
 176                 0
 177         };
 178
 179         if (state < 4) {
 180                 state = bcr_state[state];
 181                 ASSABET_BCR_clear(state ^ (ASSABET_BCR_IRDA_MD1|
 182                                            ASSABET_BCR_IRDA_MD0));
 183                 ASSABET_BCR_set(state);
 184         }
 185         return 0;
 186 }
 187
 188 static void assabet_irda_set_speed(struct device *dev, unsigned int speed)
 189 {
 190         if (speed < 4000000)
 191                 ASSABET_BCR_clear(ASSABET_BCR_IRDA_FSEL);
 192         else
 193                 ASSABET_BCR_set(ASSABET_BCR_IRDA_FSEL);
 194 }
 195
 196 static struct irda_platform_data assabet_irda_data = {
 197         .set_power      = assabet_irda_set_power,
 198         .set_speed      = assabet_irda_set_speed,
 199 };
 200
 201 static void __init assabet_init(void)
 202 {
 203         /*
 204          * Ensure that the power supply is in "high power" mode.
 205          */
 206         GPDR |= GPIO_GPIO16;
 207         GPSR = GPIO_GPIO16;
 208
 209         /*
 210          * Ensure that these pins are set as outputs and are driving
 211          * logic 0.  This ensures that we won't inadvertently toggle
 212          * the WS latch in the CPLD, and we don't float causing
 213          * excessive power drain.  --rmk
 214          */
 215         GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 216         GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 217
 218         /*
 219          * Set up registers for sleep mode.
 220          */
 221         PWER = PWER_GPIO0;
 222         PGSR = 0;
 223         PCFR = 0;
 224         PSDR = 0;
 225         PPDR |= PPC_TXD3 | PPC_TXD1;
 226         PPSR |= PPC_TXD3 | PPC_TXD1;
 227
 228         sa1100fb_lcd_power = assabet_lcd_power;
 229         sa1100fb_backlight_power = assabet_backlight_power;
 230
 231         if (machine_has_neponset()) {
 232                 /*
 233                  * Angel sets this, but other bootloaders may not.
 234                  *
 235                  * This must precede any driver calls to BCR_set()
 236                  * or BCR_clear().
 237                  */
 238                 ASSABET_BCR = BCR_value = ASSABET_BCR_DB1111;
 239
 240 #ifndef CONFIG_ASSABET_NEPONSET
 241                 printk( "Warning: Neponset detected but full support "
 242                         "hasn't been configured in the kernel\n" );
 243 #endif
 244         }
 245
 246         sa11x0_set_flash_data(&assabet_flash_data, assabet_flash_resources,
 247                               ARRAY_SIZE(assabet_flash_resources));
 248         sa11x0_set_irda_data(&assabet_irda_data);
 249 }
 250
 251 /*
 252  * On Assabet, we must probe for the Neponset board _before_
 253  * paging_init() has occurred to actually determine the amount
 254  * of RAM available.  To do so, we map the appropriate IO section
 255  * in the page table here in order to access GPIO registers.
 256  */
 257 static void __init map_sa1100_gpio_regs( void )
 258 {
 259         unsigned long phys = __PREG(GPLR) & PMD_MASK;
 260         unsigned long virt = io_p2v(phys);
 261         int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
 262         pmd_t *pmd;
 263
 264         pmd = pmd_offset(pgd_offset_k(virt), virt);
 265         *pmd = __pmd(phys | prot);
 266         flush_pmd_entry(pmd);
 267 }
 268
 269 /*
 270  * Read System Configuration "Register"
 271  * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
 272  * User's Guide", section 4.4.1)
 273  *
 274  * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S
 275  * to set up the serial port for decompression status messages. We
 276  * repeat it here because the kernel may not be loaded as a zImage, and
 277  * also because it's a hassle to communicate the SCR value to the kernel
 278  * from the decompressor.
 279  *
 280  * Note that IRQs are guaranteed to be disabled.
 281  */
 282 static void __init get_assabet_scr(void)
 283 {
 284         unsigned long scr, i;
 285
 286         GPDR |= 0x3fc;                  /* Configure GPIO 9:2 as outputs */
 287         GPSR = 0x3fc;                   /* Write 0xFF to GPIO 9:2 */
 288         GPDR &= ~(0x3fc);               /* Configure GPIO 9:2 as inputs */
 289         for(i = 100; i--; scr = GPLR);  /* Read GPIO 9:2 */
 290         GPDR |= 0x3fc;                  /*  restore correct pin direction */
 291         scr &= 0x3fc;                   /* save as system configuration byte. */
 292         SCR_value = scr;
 293 }
 294
 295 static void __init
 296 fixup_assabet(struct machine_desc *desc, struct tag *tags,
 297               char **cmdline, struct meminfo *mi)
 298 {
 299         /* This must be done before any call to machine_has_neponset() */
 300         map_sa1100_gpio_regs();
 301         get_assabet_scr();
 302
 303         if (machine_has_neponset())
 304                 printk("Neponset expansion board detected\n");
 305 }
 306
 307
 308 static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
 309 {
 310         if (port->mapbase == _Ser1UTCR0) {
 311                 if (state)
 312                         ASSABET_BCR_clear(ASSABET_BCR_RS232EN |
 313                                           ASSABET_BCR_COM_RTS |
 314                                           ASSABET_BCR_COM_DTR);
 315                 else
 316                         ASSABET_BCR_set(ASSABET_BCR_RS232EN |
 317                                         ASSABET_BCR_COM_RTS |
 318                                         ASSABET_BCR_COM_DTR);
 319         }
 320 }
 321
 322 /*
 323  * Assabet uses COM_RTS and COM_DTR for both UART1 (com port)
 324  * and UART3 (radio module).  We only handle them for UART1 here.
 325  */
 326 static void assabet_set_mctrl(struct uart_port *port, u_int mctrl)
 327 {
 328         if (port->mapbase == _Ser1UTCR0) {
 329                 u_int set = 0, clear = 0;
 330
 331                 if (mctrl & TIOCM_RTS)
 332                         clear |= ASSABET_BCR_COM_RTS;
 333                 else
 334                         set |= ASSABET_BCR_COM_RTS;
 335
 336                 if (mctrl & TIOCM_DTR)
 337                         clear |= ASSABET_BCR_COM_DTR;
 338                 else
 339                         set |= ASSABET_BCR_COM_DTR;
 340
 341                 ASSABET_BCR_clear(clear);
 342                 ASSABET_BCR_set(set);
 343         }
 344 }
 345
 346 static u_int assabet_get_mctrl(struct uart_port *port)
 347 {
 348         u_int ret = 0;
 349         u_int bsr = ASSABET_BSR;
 350
 351         /* need 2 reads to read current value */
 352         bsr = ASSABET_BSR;
 353
 354         if (port->mapbase == _Ser1UTCR0) {
 355                 if (bsr & ASSABET_BSR_COM_DCD)
 356                         ret |= TIOCM_CD;
 357                 if (bsr & ASSABET_BSR_COM_CTS)
 358                         ret |= TIOCM_CTS;
 359                 if (bsr & ASSABET_BSR_COM_DSR)
 360                         ret |= TIOCM_DSR;
 361         } else if (port->mapbase == _Ser3UTCR0) {
 362                 if (bsr & ASSABET_BSR_RAD_DCD)
 363                         ret |= TIOCM_CD;
 364                 if (bsr & ASSABET_BSR_RAD_CTS)
 365                         ret |= TIOCM_CTS;
 366                 if (bsr & ASSABET_BSR_RAD_DSR)
 367                         ret |= TIOCM_DSR;
 368                 if (bsr & ASSABET_BSR_RAD_RI)
 369                         ret |= TIOCM_RI;
 370         } else {
 371                 ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
 372         }
 373
 374         return ret;
 375 }
 376
 377 static struct sa1100_port_fns assabet_port_fns __initdata = {
 378         .set_mctrl      = assabet_set_mctrl,
 379         .get_mctrl      = assabet_get_mctrl,
 380         .pm             = assabet_uart_pm,
 381 };
 382
 383 static struct map_desc assabet_io_desc[] __initdata = {
 384  /* virtual     physical    length      type */
 385   { 0xf1000000, 0x12000000, 0x00100000, MT_DEVICE }, /* Board Control Register */
 386   { 0xf2800000, 0x4b800000, 0x00800000, MT_DEVICE }  /* MQ200 */
 387 };
 388
 389 static void __init assabet_map_io(void)
 390 {
 391         sa1100_map_io();
 392         iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc));
 393
 394         /*
 395          * Set SUS bit in SDCR0 so serial port 1 functions.
 396          * Its called GPCLKR0 in my SA1110 manual.
 397          */
 398         Ser1SDCR0 |= SDCR0_SUS;
 399
 400         if (machine_has_neponset()) {
 401 #ifdef CONFIG_ASSABET_NEPONSET
 402                 extern void neponset_map_io(void);
 403
 404                 /*
 405                  * We map Neponset registers even if it isn't present since
 406                  * many drivers will try to probe their stuff (and fail).
 407                  * This is still more friendly than a kernel paging request
 408                  * crash.
 409                  */
 410                 neponset_map_io();
 411 #endif
 412         } else {
 413                 sa1100_register_uart_fns(&assabet_port_fns);
 414         }
 415
 416         /*
 417          * When Neponset is attached, the first UART should be
 418          * UART3.  That's what Angel is doing and many documents
 419          * are stating this.
 420          *
 421          * We do the Neponset mapping even if Neponset support
 422          * isn't compiled in so the user will still get something on
 423          * the expected physical serial port.
 424          *
 425          * We no longer do this; not all boot loaders support it,
 426          * and UART3 appears to be somewhat unreliable with blob.
 427          */
 428         sa1100_register_uart(0, 1);
 429         sa1100_register_uart(2, 3);
 430 }
 431
 432
 433 MACHINE_START(ASSABET, "Intel-Assabet")
 434         .phys_ram       = 0xc0000000,
 435         .phys_io        = 0x80000000,
 436         .io_pg_offst    = ((0xf8000000) >> 18) & 0xfffc,
 437         .boot_params    = 0xc0000100,
 438         .fixup          = fixup_assabet,
 439         .map_io         = assabet_map_io,
 440         .init_irq       = sa1100_init_irq,
 441         .timer          = &sa1100_timer,
 442         .init_machine   = assabet_init,
 443 MACHINE_END