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 55unsigned long SCR_value = ASSABET_SCR_INIT; 56EXPORT_SYMBOL(SCR_value); 57 58static unsigned long BCR_value = ASSABET_BCR_DB1110; 59 60void 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 70EXPORT_SYMBOL(ASSABET_BCR_frob); 71 72static 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 */ 88static 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 */ 108static 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 */ 129static 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 148static 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 154static 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 171static 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 189static 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 197static struct irda_platform_data assabet_irda_data = { 198 .set_power = assabet_irda_set_power, 199 .set_speed = assabet_irda_set_speed, 200}; 201 202static struct mcp_plat_data assabet_mcp_data = { 203 .mccr0 = MCCR0_ADM, 204 .sclk_rate = 11981000, 205}; 206 207static void __init assabet_init(void) 208{ 209 /* 210 * Ensure that the power supply is in "high power" mode. 211 */ 212 GPDR |= GPIO_GPIO16; 213 GPSR = GPIO_GPIO16; 214 215 /* 216 * Ensure that these pins are set as outputs and are driving 217 * logic 0. This ensures that we won't inadvertently toggle 218 * the WS latch in the CPLD, and we don't float causing 219 * excessive power drain. --rmk 220 */ 221 GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; 222 GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; 223 224 /* 225 * Set up registers for sleep mode. 226 */ 227 PWER = PWER_GPIO0; 228 PGSR = 0; 229 PCFR = 0; 230 PSDR = 0; 231 PPDR |= PPC_TXD3 | PPC_TXD1; 232 PPSR |= PPC_TXD3 | PPC_TXD1; 233 234 sa1100fb_lcd_power = assabet_lcd_power; 235 sa1100fb_backlight_power = assabet_backlight_power; 236 237 if (machine_has_neponset()) { 238 /* 239 * Angel sets this, but other bootloaders may not. 240 * 241 * This must precede any driver calls to BCR_set() 242 * or BCR_clear(). 243 */ 244 ASSABET_BCR = BCR_value = ASSABET_BCR_DB1111; 245 246#ifndef CONFIG_ASSABET_NEPONSET 247 printk( "Warning: Neponset detected but full support " 248 "hasn't been configured in the kernel\n" ); 249#endif 250 } 251 252 sa11x0_register_mtd(&assabet_flash_data, assabet_flash_resources, 253 ARRAY_SIZE(assabet_flash_resources)); 254 sa11x0_register_irda(&assabet_irda_data); 255 sa11x0_register_mcp(&assabet_mcp_data); 256} 257 258/* 259 * On Assabet, we must probe for the Neponset board _before_ 260 * paging_init() has occurred to actually determine the amount 261 * of RAM available. To do so, we map the appropriate IO section 262 * in the page table here in order to access GPIO registers. 263 */ 264static void __init map_sa1100_gpio_regs( void ) 265{ 266 unsigned long phys = __PREG(GPLR) & PMD_MASK; 267 unsigned long virt = io_p2v(phys); 268 int prot = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_DOMAIN(DOMAIN_IO); 269 pmd_t *pmd; 270 271 pmd = pmd_offset(pgd_offset_k(virt), virt); 272 *pmd = __pmd(phys | prot); 273 flush_pmd_entry(pmd); 274} 275 276/* 277 * Read System Configuration "Register" 278 * (taken from "Intel StrongARM SA-1110 Microprocessor Development Board 279 * User's Guide", section 4.4.1) 280 * 281 * This same scan is performed in arch/arm/boot/compressed/head-sa1100.S 282 * to set up the serial port for decompression status messages. We 283 * repeat it here because the kernel may not be loaded as a zImage, and 284 * also because it's a hassle to communicate the SCR value to the kernel 285 * from the decompressor. 286 * 287 * Note that IRQs are guaranteed to be disabled. 288 */ 289static void __init get_assabet_scr(void) 290{ 291 unsigned long scr, i; 292 293 GPDR |= 0x3fc; /* Configure GPIO 9:2 as outputs */ 294 GPSR = 0x3fc; /* Write 0xFF to GPIO 9:2 */ 295 GPDR &= ~(0x3fc); /* Configure GPIO 9:2 as inputs */ 296 for(i = 100; i--; ) /* Read GPIO 9:2 */ 297 scr = GPLR; 298 GPDR |= 0x3fc; /* restore correct pin direction */ 299 scr &= 0x3fc; /* save as system configuration byte. */ 300 SCR_value = scr; 301} 302 303static void __init 304fixup_assabet(struct machine_desc *desc, struct tag *tags, 305 char **cmdline, struct meminfo *mi) 306{ 307 /* This must be done before any call to machine_has_neponset() */ 308 map_sa1100_gpio_regs(); 309 get_assabet_scr(); 310 311 if (machine_has_neponset()) 312 printk("Neponset expansion board detected\n"); 313} 314 315 316static void assabet_uart_pm(struct uart_port *port, u_int state, u_int oldstate) 317{ 318 if (port->mapbase == _Ser1UTCR0) { 319 if (state) 320 ASSABET_BCR_clear(ASSABET_BCR_RS232EN | 321 ASSABET_BCR_COM_RTS | 322 ASSABET_BCR_COM_DTR); 323 else 324 ASSABET_BCR_set(ASSABET_BCR_RS232EN | 325 ASSABET_BCR_COM_RTS | 326 ASSABET_BCR_COM_DTR); 327 } 328} 329 330/* 331 * Assabet uses COM_RTS and COM_DTR for both UART1 (com port) 332 * and UART3 (radio module). We only handle them for UART1 here. 333 */ 334static void assabet_set_mctrl(struct uart_port *port, u_int mctrl) 335{ 336 if (port->mapbase == _Ser1UTCR0) { 337 u_int set = 0, clear = 0; 338 339 if (mctrl & TIOCM_RTS) 340 clear |= ASSABET_BCR_COM_RTS; 341 else 342 set |= ASSABET_BCR_COM_RTS; 343 344 if (mctrl & TIOCM_DTR) 345 clear |= ASSABET_BCR_COM_DTR; 346 else 347 set |= ASSABET_BCR_COM_DTR; 348 349 ASSABET_BCR_clear(clear); 350 ASSABET_BCR_set(set); 351 } 352} 353 354static u_int assabet_get_mctrl(struct uart_port *port) 355{ 356 u_int ret = 0; 357 u_int bsr = ASSABET_BSR; 358 359 /* need 2 reads to read current value */ 360 bsr = ASSABET_BSR; 361 362 if (port->mapbase == _Ser1UTCR0) { 363 if (bsr & ASSABET_BSR_COM_DCD) 364 ret |= TIOCM_CD; 365 if (bsr & ASSABET_BSR_COM_CTS) 366 ret |= TIOCM_CTS; 367 if (bsr & ASSABET_BSR_COM_DSR) 368 ret |= TIOCM_DSR; 369 } else if (port->mapbase == _Ser3UTCR0) { 370 if (bsr & ASSABET_BSR_RAD_DCD) 371 ret |= TIOCM_CD; 372 if (bsr & ASSABET_BSR_RAD_CTS) 373 ret |= TIOCM_CTS; 374 if (bsr & ASSABET_BSR_RAD_DSR) 375 ret |= TIOCM_DSR; 376 if (bsr & ASSABET_BSR_RAD_RI) 377 ret |= TIOCM_RI; 378 } else { 379 ret = TIOCM_CD | TIOCM_CTS | TIOCM_DSR; 380 } 381 382 return ret; 383} 384 385static struct sa1100_port_fns assabet_port_fns __initdata = { 386 .set_mctrl = assabet_set_mctrl, 387 .get_mctrl = assabet_get_mctrl, 388 .pm = assabet_uart_pm, 389}; 390 391static struct map_desc assabet_io_desc[] __initdata = { 392 { /* Board Control Register */ 393 .virtual = 0xf1000000, 394 .pfn = __phys_to_pfn(0x12000000), 395 .length = 0x00100000, 396 .type = MT_DEVICE 397 }, { /* MQ200 */ 398 .virtual = 0xf2800000, 399 .pfn = __phys_to_pfn(0x4b800000), 400 .length = 0x00800000, 401 .type = MT_DEVICE 402 } 403}; 404 405static void __init assabet_map_io(void) 406{ 407 sa1100_map_io(); 408 iotable_init(assabet_io_desc, ARRAY_SIZE(assabet_io_desc)); 409 410 /* 411 * Set SUS bit in SDCR0 so serial port 1 functions. 412 * Its called GPCLKR0 in my SA1110 manual. 413 */ 414 Ser1SDCR0 |= SDCR0_SUS; 415 416 if (machine_has_neponset()) { 417#ifdef CONFIG_ASSABET_NEPONSET 418 extern void neponset_map_io(void); 419 420 /* 421 * We map Neponset registers even if it isn't present since 422 * many drivers will try to probe their stuff (and fail). 423 * This is still more friendly than a kernel paging request 424 * crash. 425 */ 426 neponset_map_io(); 427#endif 428 } else { 429 sa1100_register_uart_fns(&assabet_port_fns); 430 } 431 432 /* 433 * When Neponset is attached, the first UART should be 434 * UART3. That's what Angel is doing and many documents 435 * are stating this. 436 * 437 * We do the Neponset mapping even if Neponset support 438 * isn't compiled in so the user will still get something on 439 * the expected physical serial port. 440 * 441 * We no longer do this; not all boot loaders support it, 442 * and UART3 appears to be somewhat unreliable with blob. 443 */ 444 sa1100_register_uart(0, 1); 445 sa1100_register_uart(2, 3); 446} 447 448 449MACHINE_START(ASSABET, "Intel-Assabet") 450 .phys_io = 0x80000000, 451 .io_pg_offst = ((0xf8000000) >> 18) & 0xfffc, 452 .boot_params = 0xc0000100, 453 .fixup = fixup_assabet, 454 .map_io = assabet_map_io, 455 .init_irq = sa1100_init_irq, 456 .timer = &sa1100_timer, 457 .init_machine = assabet_init, 458MACHINE_END 459