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 <asm/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 <asm/arch/assabet.h>
  38 #include <asm/arch/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 #if 0
  75 #ifndef ASSABET_PAL_VIDEO
  76         if (on)
  77                 ASSABET_BCR_set(ASSABET_BCR_LIGHT_ON);
  78         else
  79 #endif
  80                 ASSABET_BCR_clear(ASSABET_BCR_LIGHT_ON);
  81 #endif
  82 }
  83
  84 /*
  85  * Turn on/off the backlight.  When turning the backlight on,
  86  * we wait 500us after turning it on so we don't cause the
  87  * supplies to droop when we enable the LCD controller (and
  88  * cause a hard reset.)
  89  */
  90 static void assabet_lcd_power(int on)
  91 {
  92 #ifndef ASSABET_PAL_VIDEO
  93         if (on) {
  94                 ASSABET_BCR_set(ASSABET_BCR_LCD_ON);
  95                 udelay(500);
  96         } else
  97 #endif
  98                 ASSABET_BCR_clear(ASSABET_BCR_LCD_ON);
  99 }
 100
 101
 102 /*
 103  * Assabet flash support code.
 104  */
 105
 106 #ifdef ASSABET_REV_4
 107 /*
 108  * Phase 4 Assabet has two 28F160B3 flash parts in bank 0:
 109  */
 110 static struct mtd_partition assabet_partitions[] = {
 111         {
 112                 .name           = "bootloader",
 113                 .size           = 0x00020000,
 114                 .offset         = 0,
 115                 .mask_flags     = MTD_WRITEABLE,
 116         }, {
 117                 .name           = "bootloader params",
 118                 .size           = 0x00020000,
 119                 .offset         = MTDPART_OFS_APPEND,
 120                 .mask_flags     = MTD_WRITEABLE,
 121         }, {
 122                 .name           = "jffs",
 123                 .size           = MTDPART_SIZ_FULL,
 124                 .offset         = MTDPART_OFS_APPEND,
 125         }
 126 };
 127 #else
 128 /*
 129  * Phase 5 Assabet has two 28F128J3A flash parts in bank 0:
 130  */
 131 static struct mtd_partition assabet_partitions[] = {
 132         {
 133                 .name           = "bootloader",
 134                 .size           = 0x00040000,
 135                 .offset         = 0,
 136                 .mask_flags     = MTD_WRITEABLE,
 137         }, {
 138                 .name           = "bootloader params",
 139                 .size           = 0x00040000,
 140                 .offset         = MTDPART_OFS_APPEND,
 141                 .mask_flags     = MTD_WRITEABLE,
 142         }, {
 143                 .name           = "jffs",
 144                 .size           = MTDPART_SIZ_FULL,
 145                 .offset         = MTDPART_OFS_APPEND,
 146         }
 147 };
 148 #endif
 149
 150 static struct flash_platform_data assabet_flash_data = {
 151         .map_name       = "cfi_probe",
 152         .parts          = assabet_partitions,
 153         .nr_parts       = ARRAY_SIZE(assabet_partitions),
 154 };
 155
 156 static struct resource assabet_flash_resources[] = {
 157         {
 158                 .start  = SA1100_CS0_PHYS,
 159                 .end    = SA1100_CS0_PHYS + SZ_32M - 1,
 160                 .flags  = IORESOURCE_MEM,
 161         }, {
 162                 .start  = SA1100_CS1_PHYS,
 163                 .end    = SA1100_CS1_PHYS + SZ_32M - 1,
 164                 .flags  = IORESOURCE_MEM,
 165         }
 166 };
 167
 168
 169 /*
 170  * Assabet IrDA support code.
 171  */
 172
 173 static int assabet_irda_set_power(struct device *dev, unsigned int state)
 174 {
 175         static unsigned int bcr_state[4] = {
 176                 ASSABET_BCR_IRDA_MD0,
 177                 ASSABET_BCR_IRDA_MD1|ASSABET_BCR_IRDA_MD0,
 178                 ASSABET_BCR_IRDA_MD1,
 179                 0
 180         };
 181
 182         if (state < 4) {
 183                 state = bcr_state[state];
 184                 ASSABET_BCR_clear(state ^ (ASSABET_BCR_IRDA_MD1|
 185                                            ASSABET_BCR_IRDA_MD0));
 186                 ASSABET_BCR_set(state);
 187         }
 188         return 0;
 189 }
 190
 191 static void assabet_irda_set_speed(struct device *dev, unsigned int speed)
 192 {
 193         if (speed < 4000000)
 194                 ASSABET_BCR_clear(ASSABET_BCR_IRDA_FSEL);
 195         else
 196                 ASSABET_BCR_set(ASSABET_BCR_IRDA_FSEL);
 197 }
 198
 199 static struct irda_platform_data assabet_irda_data = {
 200         .set_power      = assabet_irda_set_power,
 201         .set_speed      = assabet_irda_set_speed,
 202 };
 203
 204 static struct mcp_plat_data assabet_mcp_data = {
 205         .mccr0          = MCCR0_ADM,
 206         .sclk_rate      = 11981000,
 207 };
 208
 209 static void __init assabet_init(void)
 210 {
 211         /*
 212          * Ensure that the power supply is in "high power" mode.
 213          */
 214         GPDR |= GPIO_GPIO16;
 215         GPSR = GPIO_GPIO16;
 216
 217         /*
 218          * Ensure that these pins are set as outputs and are driving
 219          * logic 0.  This ensures that we won't inadvertently toggle
 220          * the WS latch in the CPLD, and we don't float causing
 221          * excessive power drain.  --rmk
 222          */
 223         GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 224         GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM;
 225
 226         /*
 227          * Set up registers for sleep mode.
 228          */
 229         PWER = PWER_GPIO0;
 230         PGSR = 0;
 231         PCFR = 0;
 232         PSDR = 0;
 233         PPDR |= PPC_TXD3 | PPC_TXD1;
 234         PPSR |= PPC_TXD3 | PPC_TXD1;
 235
 236         set_irq_type(IRQ_GPIO0, IRQT_FALLING);
 237         enable_irq_wake(IRQ_GPIO0);
 238
 239         sa1100fb_lcd_power = assabet_lcd_power;
 240         sa1100fb_backlight_power = assabet_backlight_power;
 241
 242         if (machine_has_neponset()) {
 243                 /*
 244                  * Angel sets this, but other bootloaders may not.
 245                  *
 246                  * This must precede any driver calls to BCR_set()
 247                  * or BCR_clear().
 248                  */
 249                 ASSABET_BCR = BCR_value = ASSABET_BCR_DB1111;
 250
 251 #ifndef CONFIG_ASSABET_NEPONSET
 252                 printk( "Warning: Neponset detected but full support "
 253                         "hasn't been configured in the kernel\n" );
 254 #endif
 255         }
 256
 257         sa11x0_set_flash_data(&assabet_flash_data, assabet_flash_resources,
 258                               ARRAY_SIZE(assabet_flash_resources));
 259         sa11x0_set_irda_data(&assabet_irda_data);
 260         sa11x0_set_mcp_data(&assabet_mcp_data);
 261 }
 262
 263 /*
 264  * On Assabet, we must probe for the Neponset board _before_
 265  * paging_init() has occurred to actually determine the amount
 266  * of RAM available.  To do so, we map the appropriate IO section
 267  * in the page table here in order to access GPIO registers.
 268  */
 269 static void __init map_sa1100_gpio_regs( void )
 270 {
 271         unsigned long phys = __PREG(GPLR) & PMD_MASK;
 272         unsigned long virt = io_p2v(phys);
 273         int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO);
 274         pmd_t *pmd;
 275
 276         pmd = pmd_offset(pgd_offset_k(virt), virt);
 277         *pmd = __pmd(phys | prot);
 278         flush_pmd_entry(pmd);
 279 }
 280
 281 /*
 282  * Read System Configuration "Register"
 283  * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
 284  * User's Guide", section 4.4.1)
 285  *
 286  * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S
 287  * to set up the serial port for decompression status messages. We
 288  * repeat it here because the kernel may not be loaded as a zImage, and
 289  * also because it's a hassle to communicate the SCR value to the kernel
 290  * from the decompressor.
 291  *
 292  * Note that IRQs are guaranteed to be disabled.
 293  */
 294 static void __init get_assabet_scr(void)
 295 {
 296         unsigned long scr, i;
 297
 298         GPDR |= 0x3fc;                  /* Configure GPIO 9:2 as outputs */
 299         GPSR = 0x3fc;                   /* Write 0xFF to GPIO 9:2 */
 300         GPDR &= ~(0x3fc);               /* Configure GPIO 9:2 as inputs */
 301         for(i = 100; i--; )             /* Read GPIO 9:2 */
 302                 scr = GPLR;
 303         GPDR |= 0x3fc;                  /*  restore correct pin direction */
 304         scr &= 0x3fc;                   /* save as system configuration byte. */
 305         SCR_value = scr;
 306 }
 307
 308 static void __init
 309 fixup_assabet(struct machine_desc *desc, struct tag *tags,
 310               char **cmdline, struct meminfo *mi)
 311 {
 312         /* This must be done before any call to machine_has_neponset() */
 313         map_sa1100_gpio_regs();
 314         get_assabet_scr();
 315
 316         if (machine_has_neponset()) {
 317                 printk("Neponset expansion board detected\n");
 318         } else {
 319                 strcpy(*cmdline, "console=ttySA0,38400n8 cpufreq=221200 "
 320                         "rw root=/dev/mtdblock3 load_ramdisk=1 prompt_ramdisk=0 "
 321                         "noinitrd mem=32M");
 322         }
 323 }
 324
 325
 326 static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate)
 327 {
 328         if (port->mapbase == _Ser1UTCR0) {
 329                 if (state)
 330                         ASSABET_BCR_clear(ASSABET_BCR_RS232EN |
 331                                           ASSABET_BCR_COM_RTS |
 332                                           ASSABET_BCR_COM_DTR);
 333                 else
 334                         ASSABET_BCR_set(ASSABET_BCR_RS232EN |
 335                                         ASSABET_BCR_COM_RTS |
 336                                         ASSABET_BCR_COM_DTR);
 337         }
 338 }
 339
 340 /*
 341  * Assabet uses COM_RTS and COM_DTR for both UART1 (com port)
 342  * and UART3 (radio module).  We only handle them for UART1 here.
 343  */
 344 static void assabet_set_mctrl(struct uart_port *port, u_int mctrl)
 345 {
 346         if (port->mapbase == _Ser1UTCR0) {
 347                 u_int set = 0, clear = 0;
 348
 349                 if (mctrl & TIOCM_RTS)
 350                         clear |= ASSABET_BCR_COM_RTS;
 351                 else
 352                         set |= ASSABET_BCR_COM_RTS;
 353
 354                 if (mctrl & TIOCM_DTR)
 355                         clear |= ASSABET_BCR_COM_DTR;
 356                 else
 357                         set |= ASSABET_BCR_COM_DTR;
 358
 359                 ASSABET_BCR_clear(clear);
 360                 ASSABET_BCR_set(set);
 361         }
 362 }
 363
 364 static u_int assabet_get_mctrl(struct uart_port *port)
 365 {
 366         u_int ret = 0;
 367         u_int bsr = ASSABET_BSR;
 368
 369         /* need 2 reads to read current value */
 370         bsr = ASSABET_BSR;
 371
 372         if (port->mapbase == _Ser1UTCR0) {
 373                 if (bsr & ASSABET_BSR_COM_DCD)
 374                         ret |= TIOCM_CD;
 375                 if (bsr & ASSABET_BSR_COM_CTS)
 376                         ret |= TIOCM_CTS;
 377                 if (bsr & ASSABET_BSR_COM_DSR)
 378                         ret |= TIOCM_DSR;
 379         } else if (port->mapbase == _Ser3UTCR0) {
 380                 if (bsr & ASSABET_BSR_RAD_DCD)
 381                         ret |= TIOCM_CD;
 382                 if (bsr & ASSABET_BSR_RAD_CTS)
 383                         ret |= TIOCM_CTS;
 384                 if (bsr & ASSABET_BSR_RAD_DSR)
 385                         ret |= TIOCM_DSR;
 386                 if (bsr & ASSABET_BSR_RAD_RI)
 387                         ret |= TIOCM_RI;
 388         } else {
 389                 ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR;
 390         }
 391
 392         return ret;
 393 }
 394
 395 static struct sa1100_port_fns assabet_port_fns __initdata = {
 396         .set_mctrl      = assabet_set_mctrl,
 397         .get_mctrl      = assabet_get_mctrl,
 398         .pm             = assabet_uart_pm,
 399 };
 400
 401 static struct map_desc assabet_io_desc[] __initdata = {
 402         {       /* Board Control Register */
 403                 .virtual        =  0xf1000000,
 404                 .pfn            = __phys_to_pfn(0x12000000),
 405                 .length         = 0x00100000,
 406                 .type           = MT_DEVICE
 407         }, {    /* MQ200 */
 408                 .virtual        =  0xf2800000,
 409                 .pfn            = __phys_to_pfn(0x4b800000),
 410                 .length         = 0x00800000,
 411                 .type           = MT_DEVICE
 412         }
 413 };
 414
 415 static void __init assabet_map_io(void)
 416 {
 417         sa1100_map_io();
 418         iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc));
 419
 420         /*
 421          * Set SUS bit in SDCR0 so serial port 1 functions.
 422          * Its called GPCLKR0 in my SA1110 manual.
 423          */
 424         Ser1SDCR0 |= SDCR0_SUS;
 425
 426         if (machine_has_neponset()) {
 427 #ifdef CONFIG_ASSABET_NEPONSET
 428                 extern void neponset_map_io(void);
 429
 430                 /*
 431                  * We map Neponset registers even if it isn't present since
 432                  * many drivers will try to probe their stuff (and fail).
 433                  * This is still more friendly than a kernel paging request
 434                  * crash.
 435                  */
 436                 neponset_map_io();
 437 #endif
 438         } else {
 439                 sa1100_register_uart_fns(&assabet_port_fns);
 440         }
 441
 442         /*
 443          * When Neponset is attached, the first UART should be
 444          * UART3.  That's what Angel is doing and many documents
 445          * are stating this.
 446          *
 447          * We do the Neponset mapping even if Neponset support
 448          * isn't compiled in so the user will still get something on
 449          * the expected physical serial port.
 450          *
 451          * We no longer do this; not all boot loaders support it,
 452          * and UART3 appears to be somewhat unreliable with blob.
 453          */
 454         sa1100_register_uart(0, 1);
 455         sa1100_register_uart(2, 3);
 456 }
 457
 458
 459 MACHINE_START(ASSABET, "Intel-Assabet")
 460         .phys_io        = 0x80000000,
 461         .io_pg_offst    = ((0xf8000000) >> 18) & 0xfffc,
 462         .boot_params    = 0xc0000100,
 463         .fixup          = fixup_assabet,
 464         .map_io         = assabet_map_io,
 465         .init_irq       = sa1100_init_irq,
 466         .timer          = &sa1100_timer,
 467         .init_machine   = assabet_init,
 468 MACHINE_END