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 472