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 444