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-hwdef.h> 30 #include <asm/pgtable.h> 31 #include <asm/tlbflush.h> 32 33 #include <asm/mach/arch.h> 34 #include <asm/mach/flash.h> 35 #include <asm/mach/irda.h> 36 #include <asm/mach/map.h> 37 #include <asm/mach/serial_sa1100.h> 38 #include <asm/arch/assabet.h> 39 #include <asm/arch/mcp.h> 40 41 #include "generic.h" 42 43 #define ASSABET_BCR_DB1110 \ 44 (ASSABET_BCR_SPK_OFF | ASSABET_BCR_QMUTE | \ 45 ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED | \ 46 ASSABET_BCR_RS232EN | ASSABET_BCR_LCD_12RGB | \ 47 ASSABET_BCR_IRDA_MD0) 48 49 #define ASSABET_BCR_DB1111 \ 50 (ASSABET_BCR_SPK_OFF | ASSABET_BCR_QMUTE | \ 51 ASSABET_BCR_LED_GREEN | ASSABET_BCR_LED_RED | \ 52 ASSABET_BCR_RS232EN | ASSABET_BCR_LCD_12RGB | \ 53 ASSABET_BCR_CF_BUS_OFF | ASSABET_BCR_STEREO_LB | \ 54 ASSABET_BCR_IRDA_MD0 | ASSABET_BCR_CF_RST) 55 56 unsigned long SCR_value = ASSABET_SCR_INIT; 57 EXPORT_SYMBOL(SCR_value); 58 59 static unsigned long BCR_value = ASSABET_BCR_DB1110; 60 61 void ASSABET_BCR_frob(unsigned int mask, unsigned int val) 62 { 63 unsigned long flags; 64 65 local_irq_save(flags); 66 BCR_value = (BCR_value & ~mask) | val; 67 ASSABET_BCR = BCR_value; 68 local_irq_restore(flags); 69 } 70 71 EXPORT_SYMBOL(ASSABET_BCR_frob); 72 73 static void assabet_backlight_power(int on) 74 { 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 } 82 83 /* 84 * Turn on/off the backlight. When turning the backlight on, 85 * we wait 500us after turning it on so we don't cause the 86 * supplies to droop when we enable the LCD controller (and 87 * cause a hard reset.) 88 */ 89 static void assabet_lcd_power(int on) 90 { 91 #ifndef ASSABET_PAL_VIDEO 92 if (on) { 93 ASSABET_BCR_set(ASSABET_BCR_LCD_ON); 94 udelay(500); 95 } else 96 #endif 97 ASSABET_BCR_clear(ASSABET_BCR_LCD_ON); 98 } 99 100 101 /* 102 * Assabet flash support code. 103 */ 104 105 #ifdef ASSABET_REV_4 106 /* 107 * Phase 4 Assabet has two 28F160B3 flash parts in bank 0: 108 */ 109 static struct mtd_partition assabet_partitions[] = { 110 { 111 .name = "bootloader", 112 .size = 0x00020000, 113 .offset = 0, 114 .mask_flags = MTD_WRITEABLE, 115 }, { 116 .name = "bootloader params", 117 .size = 0x00020000, 118 .offset = MTDPART_OFS_APPEND, 119 .mask_flags = MTD_WRITEABLE, 120 }, { 121 .name = "jffs", 122 .size = MTDPART_SIZ_FULL, 123 .offset = MTDPART_OFS_APPEND, 124 } 125 }; 126 #else 127 /* 128 * Phase 5 Assabet has two 28F128J3A flash parts in bank 0: 129 */ 130 static struct mtd_partition assabet_partitions[] = { 131 { 132 .name = "bootloader", 133 .size = 0x00040000, 134 .offset = 0, 135 .mask_flags = MTD_WRITEABLE, 136 }, { 137 .name = "bootloader params", 138 .size = 0x00040000, 139 .offset = MTDPART_OFS_APPEND, 140 .mask_flags = MTD_WRITEABLE, 141 }, { 142 .name = "jffs", 143 .size = MTDPART_SIZ_FULL, 144 .offset = MTDPART_OFS_APPEND, 145 } 146 }; 147 #endif 148 149 static struct flash_platform_data assabet_flash_data = { 150 .map_name = "cfi_probe", 151 .parts = assabet_partitions, 152 .nr_parts = ARRAY_SIZE(assabet_partitions), 153 }; 154 155 static struct resource assabet_flash_resources[] = { 156 { 157 .start = SA1100_CS0_PHYS, 158 .end = SA1100_CS0_PHYS + SZ_32M - 1, 159 .flags = IORESOURCE_MEM, 160 }, { 161 .start = SA1100_CS1_PHYS, 162 .end = SA1100_CS1_PHYS + SZ_32M - 1, 163 .flags = IORESOURCE_MEM, 164 } 165 }; 166 167 168 /* 169 * Assabet IrDA support code. 170 */ 171 172 static int assabet_irda_set_power(struct device *dev, unsigned int state) 173 { 174 static unsigned int bcr_state[4] = { 175 ASSABET_BCR_IRDA_MD0, 176 ASSABET_BCR_IRDA_MD1|ASSABET_BCR_IRDA_MD0, 177 ASSABET_BCR_IRDA_MD1, 178 0 179 }; 180 181 if (state < 4) { 182 state = bcr_state[state]; 183 ASSABET_BCR_clear(state ^ (ASSABET_BCR_IRDA_MD1| 184 ASSABET_BCR_IRDA_MD0)); 185 ASSABET_BCR_set(state); 186 } 187 return 0; 188 } 189 190 static void assabet_irda_set_speed(struct device *dev, unsigned int speed) 191 { 192 if (speed < 4000000) 193 ASSABET_BCR_clear(ASSABET_BCR_IRDA_FSEL); 194 else 195 ASSABET_BCR_set(ASSABET_BCR_IRDA_FSEL); 196 } 197 198 static struct irda_platform_data assabet_irda_data = { 199 .set_power = assabet_irda_set_power, 200 .set_speed = assabet_irda_set_speed, 201 }; 202 203 static struct mcp_plat_data assabet_mcp_data = { 204 .mccr0 = MCCR0_ADM, 205 .sclk_rate = 11981000, 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_set_flash_data(&assabet_flash_data, assabet_flash_resources, 254 ARRAY_SIZE(assabet_flash_resources)); 255 sa11x0_set_irda_data(&assabet_irda_data); 256 sa11x0_set_mcp_data(&assabet_mcp_data); 257 } 258 259 /* 260 * On Assabet, we must probe for the Neponset board _before_ 261 * paging_init() has occurred to actually determine the amount 262 * of RAM available. To do so, we map the appropriate IO section 263 * in the page table here in order to access GPIO registers. 264 */ 265 static void __init map_sa1100_gpio_regs( void ) 266 { 267 unsigned long phys = __PREG(GPLR) & PMD_MASK; 268 unsigned long virt = io_p2v(phys); 269 int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO); 270 pmd_t *pmd; 271 272 pmd = pmd_offset(pgd_offset_k(virt), virt); 273 *pmd = __pmd(phys | prot); 274 flush_pmd_entry(pmd); 275 } 276 277 /* 278 * Read System Configuration "Register" 279 * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board 280 * User's Guide", section 4.4.1) 281 * 282 * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S 283 * to set up the serial port for decompression status messages. We 284 * repeat it here because the kernel may not be loaded as a zImage, and 285 * also because it's a hassle to communicate the SCR value to the kernel 286 * from the decompressor. 287 * 288 * Note that IRQs are guaranteed to be disabled. 289 */ 290 static void __init get_assabet_scr(void) 291 { 292 unsigned long scr, i; 293 294 GPDR |= 0x3fc; /* Configure GPIO 9:2 as outputs */ 295 GPSR = 0x3fc; /* Write 0xFF to GPIO 9:2 */ 296 GPDR &= ~(0x3fc); /* Configure GPIO 9:2 as inputs */ 297 for(i = 100; i--; ) /* Read GPIO 9:2 */ 298 scr = GPLR; 299 GPDR |= 0x3fc; /* restore correct pin direction */ 300 scr &= 0x3fc; /* save as system configuration byte. */ 301 SCR_value = scr; 302 } 303 304 static void __init 305 fixup_assabet(struct machine_desc *desc, struct tag *tags, 306 char **cmdline, struct meminfo *mi) 307 { 308 /* This must be done before any call to machine_has_neponset() */ 309 map_sa1100_gpio_regs(); 310 get_assabet_scr(); 311 312 if (machine_has_neponset()) 313 printk("Neponset expansion board detected\n"); 314 } 315 316 317 static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate) 318 { 319 if (port->mapbase == _Ser1UTCR0) { 320 if (state) 321 ASSABET_BCR_clear(ASSABET_BCR_RS232EN | 322 ASSABET_BCR_COM_RTS | 323 ASSABET_BCR_COM_DTR); 324 else 325 ASSABET_BCR_set(ASSABET_BCR_RS232EN | 326 ASSABET_BCR_COM_RTS | 327 ASSABET_BCR_COM_DTR); 328 } 329 } 330 331 /* 332 * Assabet uses COM_RTS and COM_DTR for both UART1 (com port) 333 * and UART3 (radio module). We only handle them for UART1 here. 334 */ 335 static void assabet_set_mctrl(struct uart_port *port, u_int mctrl) 336 { 337 if (port->mapbase == _Ser1UTCR0) { 338 u_int set = 0, clear = 0; 339 340 if (mctrl & TIOCM_RTS) 341 clear |= ASSABET_BCR_COM_RTS; 342 else 343 set |= ASSABET_BCR_COM_RTS; 344 345 if (mctrl & TIOCM_DTR) 346 clear |= ASSABET_BCR_COM_DTR; 347 else 348 set |= ASSABET_BCR_COM_DTR; 349 350 ASSABET_BCR_clear(clear); 351 ASSABET_BCR_set(set); 352 } 353 } 354 355 static u_int assabet_get_mctrl(struct uart_port *port) 356 { 357 u_int ret = 0; 358 u_int bsr = ASSABET_BSR; 359 360 /* need 2 reads to read current value */ 361 bsr = ASSABET_BSR; 362 363 if (port->mapbase == _Ser1UTCR0) { 364 if (bsr & ASSABET_BSR_COM_DCD) 365 ret |= TIOCM_CD; 366 if (bsr & ASSABET_BSR_COM_CTS) 367 ret |= TIOCM_CTS; 368 if (bsr & ASSABET_BSR_COM_DSR) 369 ret |= TIOCM_DSR; 370 } else if (port->mapbase == _Ser3UTCR0) { 371 if (bsr & ASSABET_BSR_RAD_DCD) 372 ret |= TIOCM_CD; 373 if (bsr & ASSABET_BSR_RAD_CTS) 374 ret |= TIOCM_CTS; 375 if (bsr & ASSABET_BSR_RAD_DSR) 376 ret |= TIOCM_DSR; 377 if (bsr & ASSABET_BSR_RAD_RI) 378 ret |= TIOCM_RI; 379 } else { 380 ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR; 381 } 382 383 return ret; 384 } 385 386 static struct sa1100_port_fns assabet_port_fns __initdata = { 387 .set_mctrl = assabet_set_mctrl, 388 .get_mctrl = assabet_get_mctrl, 389 .pm = assabet_uart_pm, 390 }; 391 392 static struct map_desc assabet_io_desc[] __initdata = { 393 { /* Board Control Register */ 394 .virtual = 0xf1000000, 395 .pfn = __phys_to_pfn(0x12000000), 396 .length = 0x00100000, 397 .type = MT_DEVICE 398 }, { /* MQ200 */ 399 .virtual = 0xf2800000, 400 .pfn = __phys_to_pfn(0x4b800000), 401 .length = 0x00800000, 402 .type = MT_DEVICE 403 } 404 }; 405 406 static void __init assabet_map_io(void) 407 { 408 sa1100_map_io(); 409 iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc)); 410 411 /* 412 * Set SUS bit in SDCR0 so serial port 1 functions. 413 * Its called GPCLKR0 in my SA1110 manual. 414 */ 415 Ser1SDCR0 |= SDCR0_SUS; 416 417 if (machine_has_neponset()) { 418 #ifdef CONFIG_ASSABET_NEPONSET 419 extern void neponset_map_io(void); 420 421 /* 422 * We map Neponset registers even if it isn't present since 423 * many drivers will try to probe their stuff (and fail). 424 * This is still more friendly than a kernel paging request 425 * crash. 426 */ 427 neponset_map_io(); 428 #endif 429 } else { 430 sa1100_register_uart_fns(&assabet_port_fns); 431 } 432 433 /* 434 * When Neponset is attached, the first UART should be 435 * UART3. That's what Angel is doing and many documents 436 * are stating this. 437 * 438 * We do the Neponset mapping even if Neponset support 439 * isn't compiled in so the user will still get something on 440 * the expected physical serial port. 441 * 442 * We no longer do this; not all boot loaders support it, 443 * and UART3 appears to be somewhat unreliable with blob. 444 */ 445 sa1100_register_uart(0, 1); 446 sa1100_register_uart(2, 3); 447 } 448 449 450 MACHINE_START(ASSABET, "Intel-Assabet") 451 .phys_io = 0x80000000, 452 .io_pg_offst = ((0xf8000000) >> 18) & 0xfffc, 453 .boot_params = 0xc0000100, 454 .fixup = fixup_assabet, 455 .map_io = assabet_map_io, 456 .init_irq = sa1100_init_irq, 457 .timer = &sa1100_timer, 458 .init_machine = assabet_init, 459 MACHINE_END 460