Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 1 | /* |
| 2 | * at91_cf.c -- AT91 CompactFlash controller driver |
| 3 | * |
| 4 | * Copyright (C) 2005 David Brownell |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | |
| 20 | #include <pcmcia/ss.h> |
| 21 | |
| 22 | #include <asm/hardware.h> |
| 23 | #include <asm/io.h> |
| 24 | #include <asm/sizes.h> |
| 25 | |
| 26 | #include <asm/arch/at91rm9200.h> |
| 27 | #include <asm/arch/board.h> |
| 28 | #include <asm/arch/gpio.h> |
| 29 | |
| 30 | |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 31 | /* |
| 32 | * A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW; |
| 33 | * some other bit in {A24,A22..A11} is nREG to flag memory access |
| 34 | * (vs attributes). So more than 2KB/region would just be waste. |
| 35 | */ |
| 36 | #define CF_ATTR_PHYS (AT91_CF_BASE) |
| 37 | #define CF_IO_PHYS (AT91_CF_BASE + (1 << 23)) |
| 38 | #define CF_MEM_PHYS (AT91_CF_BASE + 0x017ff800) |
| 39 | |
| 40 | /*--------------------------------------------------------------------------*/ |
| 41 | |
| 42 | static const char driver_name[] = "at91_cf"; |
| 43 | |
| 44 | struct at91_cf_socket { |
| 45 | struct pcmcia_socket socket; |
| 46 | |
| 47 | unsigned present:1; |
| 48 | |
| 49 | struct platform_device *pdev; |
| 50 | struct at91_cf_data *board; |
| 51 | }; |
| 52 | |
| 53 | #define SZ_2K (2 * SZ_1K) |
| 54 | |
| 55 | static inline int at91_cf_present(struct at91_cf_socket *cf) |
| 56 | { |
| 57 | return !at91_get_gpio_value(cf->board->det_pin); |
| 58 | } |
| 59 | |
| 60 | /*--------------------------------------------------------------------------*/ |
| 61 | |
| 62 | static int at91_cf_ss_init(struct pcmcia_socket *s) |
| 63 | { |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static irqreturn_t at91_cf_irq(int irq, void *_cf, struct pt_regs *r) |
| 68 | { |
| 69 | struct at91_cf_socket *cf = (struct at91_cf_socket *) _cf; |
| 70 | |
| 71 | if (irq == cf->board->det_pin) { |
| 72 | unsigned present = at91_cf_present(cf); |
| 73 | |
| 74 | /* kick pccard as needed */ |
| 75 | if (present != cf->present) { |
| 76 | cf->present = present; |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 77 | pr_debug("%s: card %s\n", driver_name, |
| 78 | present ? "present" : "gone"); |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 79 | pcmcia_parse_events(&cf->socket, SS_DETECT); |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | return IRQ_HANDLED; |
| 84 | } |
| 85 | |
| 86 | static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp) |
| 87 | { |
| 88 | struct at91_cf_socket *cf; |
| 89 | |
| 90 | if (!sp) |
| 91 | return -EINVAL; |
| 92 | |
| 93 | cf = container_of(s, struct at91_cf_socket, socket); |
| 94 | |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 95 | /* NOTE: CF is always 3VCARD */ |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 96 | if (at91_cf_present(cf)) { |
| 97 | int rdy = cf->board->irq_pin; /* RDY/nIRQ */ |
| 98 | int vcc = cf->board->vcc_pin; |
| 99 | |
| 100 | *sp = SS_DETECT | SS_3VCARD; |
| 101 | if (!rdy || at91_get_gpio_value(rdy)) |
| 102 | *sp |= SS_READY; |
| 103 | if (!vcc || at91_get_gpio_value(vcc)) |
| 104 | *sp |= SS_POWERON; |
| 105 | } else |
| 106 | *sp = 0; |
| 107 | |
| 108 | return 0; |
| 109 | } |
| 110 | |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 111 | static int |
| 112 | at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 113 | { |
| 114 | struct at91_cf_socket *cf; |
| 115 | |
| 116 | cf = container_of(sock, struct at91_cf_socket, socket); |
| 117 | |
| 118 | /* switch Vcc if needed and possible */ |
| 119 | if (cf->board->vcc_pin) { |
| 120 | switch (s->Vcc) { |
| 121 | case 0: |
| 122 | at91_set_gpio_value(cf->board->vcc_pin, 0); |
| 123 | break; |
| 124 | case 33: |
| 125 | at91_set_gpio_value(cf->board->vcc_pin, 1); |
| 126 | break; |
| 127 | default: |
| 128 | return -EINVAL; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | /* toggle reset if needed */ |
| 133 | at91_set_gpio_value(cf->board->rst_pin, s->flags & SS_RESET); |
| 134 | |
| 135 | pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n", |
| 136 | driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask); |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static int at91_cf_ss_suspend(struct pcmcia_socket *s) |
| 142 | { |
| 143 | return at91_cf_set_socket(s, &dead_socket); |
| 144 | } |
| 145 | |
| 146 | /* we already mapped the I/O region */ |
| 147 | static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) |
| 148 | { |
| 149 | struct at91_cf_socket *cf; |
| 150 | u32 csr; |
| 151 | |
| 152 | cf = container_of(s, struct at91_cf_socket, socket); |
| 153 | io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ); |
| 154 | |
| 155 | /* |
| 156 | * Use 16 bit accesses unless/until we need 8-bit i/o space. |
| 157 | * Always set CSR4 ... PCMCIA won't always unmap things. |
| 158 | */ |
| 159 | csr = at91_sys_read(AT91_SMC_CSR(4)) & ~AT91_SMC_DBW; |
| 160 | |
| 161 | /* |
| 162 | * NOTE: this CF controller ignores IOIS16, so we can't really do |
| 163 | * MAP_AUTOSZ. The 16bit mode allows single byte access on either |
| 164 | * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many |
| 165 | * purposes (and handles ide-cs). |
| 166 | * |
| 167 | * The 8bit mode is needed for odd byte access on D0-D7. It seems |
| 168 | * some cards only like that way to get at the odd byte, despite |
| 169 | * CF 3.0 spec table 35 also giving the D8-D15 option. |
| 170 | */ |
| 171 | if (!(io->flags & (MAP_16BIT|MAP_AUTOSZ))) { |
| 172 | csr |= AT91_SMC_DBW_8; |
| 173 | pr_debug("%s: 8bit i/o bus\n", driver_name); |
| 174 | } else { |
| 175 | csr |= AT91_SMC_DBW_16; |
| 176 | pr_debug("%s: 16bit i/o bus\n", driver_name); |
| 177 | } |
| 178 | at91_sys_write(AT91_SMC_CSR(4), csr); |
| 179 | |
| 180 | io->start = cf->socket.io_offset; |
| 181 | io->stop = io->start + SZ_2K - 1; |
| 182 | |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | /* pcmcia layer maps/unmaps mem regions */ |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 187 | static int |
| 188 | at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 189 | { |
| 190 | struct at91_cf_socket *cf; |
| 191 | |
| 192 | if (map->card_start) |
| 193 | return -EINVAL; |
| 194 | |
| 195 | cf = container_of(s, struct at91_cf_socket, socket); |
| 196 | |
| 197 | map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; |
| 198 | if (map->flags & MAP_ATTRIB) |
| 199 | map->static_start = CF_ATTR_PHYS; |
| 200 | else |
| 201 | map->static_start = CF_MEM_PHYS; |
| 202 | |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | static struct pccard_operations at91_cf_ops = { |
| 207 | .init = at91_cf_ss_init, |
| 208 | .suspend = at91_cf_ss_suspend, |
| 209 | .get_status = at91_cf_get_status, |
| 210 | .set_socket = at91_cf_set_socket, |
| 211 | .set_io_map = at91_cf_set_io_map, |
| 212 | .set_mem_map = at91_cf_set_mem_map, |
| 213 | }; |
| 214 | |
| 215 | /*--------------------------------------------------------------------------*/ |
| 216 | |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 217 | static int __init at91_cf_probe(struct platform_device *pdev) |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 218 | { |
| 219 | struct at91_cf_socket *cf; |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 220 | struct at91_cf_data *board = pdev->dev.platform_data; |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 221 | struct resource *io; |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 222 | unsigned int csa; |
| 223 | int status; |
| 224 | |
| 225 | if (!board || !board->det_pin || !board->rst_pin) |
| 226 | return -ENODEV; |
| 227 | |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 228 | io = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 229 | if (!io) |
| 230 | return -ENODEV; |
| 231 | |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 232 | cf = kcalloc(1, sizeof *cf, GFP_KERNEL); |
| 233 | if (!cf) |
| 234 | return -ENOMEM; |
| 235 | |
| 236 | cf->board = board; |
| 237 | cf->pdev = pdev; |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 238 | platform_set_drvdata(pdev, cf); |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 239 | |
| 240 | /* CF takes over CS4, CS5, CS6 */ |
| 241 | csa = at91_sys_read(AT91_EBI_CSA); |
| 242 | at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH); |
| 243 | |
| 244 | /* force poweron defaults for these pins ... */ |
| 245 | (void) at91_set_A_periph(AT91_PIN_PC9, 0); /* A25/CFRNW */ |
| 246 | (void) at91_set_A_periph(AT91_PIN_PC10, 0); /* NCS4/CFCS */ |
| 247 | (void) at91_set_A_periph(AT91_PIN_PC11, 0); /* NCS5/CFCE1 */ |
| 248 | (void) at91_set_A_periph(AT91_PIN_PC12, 0); /* NCS6/CFCE2 */ |
| 249 | |
| 250 | /* nWAIT is _not_ a default setting */ |
| 251 | (void) at91_set_A_periph(AT91_PIN_PC6, 1); /* nWAIT */ |
| 252 | |
| 253 | /* |
| 254 | * Static memory controller timing adjustments. |
| 255 | * REVISIT: these timings are in terms of MCK cycles, so |
| 256 | * when MCK changes (cpufreq etc) so must these values... |
| 257 | */ |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 258 | at91_sys_write(AT91_SMC_CSR(4), |
| 259 | AT91_SMC_ACSS_STD |
| 260 | | AT91_SMC_DBW_16 |
| 261 | | AT91_SMC_BAT |
| 262 | | AT91_SMC_WSEN |
| 263 | | AT91_SMC_NWS_(32) /* wait states */ |
| 264 | | AT91_SMC_RWSETUP_(6) /* setup time */ |
| 265 | | AT91_SMC_RWHOLD_(4) /* hold time */ |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 266 | ); |
| 267 | |
| 268 | /* must be a GPIO; ergo must trigger on both edges */ |
| 269 | status = request_irq(board->det_pin, at91_cf_irq, |
| 270 | SA_SAMPLE_RANDOM, driver_name, cf); |
| 271 | if (status < 0) |
| 272 | goto fail0; |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 273 | device_init_wakeup(&pdev->dev, 1); |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 274 | |
| 275 | /* |
| 276 | * The card driver will request this irq later as needed. |
| 277 | * but it causes lots of "irqNN: nobody cared" messages |
| 278 | * unless we report that we handle everything (sigh). |
| 279 | * (Note: DK board doesn't wire the IRQ pin...) |
| 280 | */ |
| 281 | if (board->irq_pin) { |
| 282 | status = request_irq(board->irq_pin, at91_cf_irq, |
| 283 | SA_SHIRQ, driver_name, cf); |
| 284 | if (status < 0) |
| 285 | goto fail0a; |
| 286 | cf->socket.pci_irq = board->irq_pin; |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 287 | } else |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 288 | cf->socket.pci_irq = NR_IRQS + 1; |
| 289 | |
| 290 | /* pcmcia layer only remaps "real" memory not iospace */ |
| 291 | cf->socket.io_offset = (unsigned long) ioremap(CF_IO_PHYS, SZ_2K); |
| 292 | if (!cf->socket.io_offset) |
| 293 | goto fail1; |
| 294 | |
| 295 | /* reserve CS4, CS5, and CS6 regions; but use just CS4 */ |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 296 | if (!request_mem_region(io->start, io->end + 1 - io->start, |
| 297 | driver_name)) |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 298 | goto fail1; |
| 299 | |
| 300 | pr_info("%s: irqs det #%d, io #%d\n", driver_name, |
| 301 | board->det_pin, board->irq_pin); |
| 302 | |
| 303 | cf->socket.owner = THIS_MODULE; |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 304 | cf->socket.dev.dev = &pdev->dev; |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 305 | cf->socket.ops = &at91_cf_ops; |
| 306 | cf->socket.resource_ops = &pccard_static_ops; |
| 307 | cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
| 308 | | SS_CAP_MEM_ALIGN; |
| 309 | cf->socket.map_size = SZ_2K; |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 310 | cf->socket.io[0].res = io; |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 311 | |
| 312 | status = pcmcia_register_socket(&cf->socket); |
| 313 | if (status < 0) |
| 314 | goto fail2; |
| 315 | |
| 316 | return 0; |
| 317 | |
| 318 | fail2: |
| 319 | iounmap((void __iomem *) cf->socket.io_offset); |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 320 | release_mem_region(io->start, io->end + 1 - io->start); |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 321 | fail1: |
| 322 | if (board->irq_pin) |
| 323 | free_irq(board->irq_pin, cf); |
| 324 | fail0a: |
| 325 | free_irq(board->det_pin, cf); |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 326 | device_init_wakeup(&pdev->dev, 0); |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 327 | fail0: |
| 328 | at91_sys_write(AT91_EBI_CSA, csa); |
| 329 | kfree(cf); |
| 330 | return status; |
| 331 | } |
| 332 | |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 333 | static int __exit at91_cf_remove(struct platform_device *pdev) |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 334 | { |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 335 | struct at91_cf_socket *cf = platform_get_drvdata(pdev); |
| 336 | struct at91_cf_data *board = cf->board; |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 337 | struct resource *io = cf->socket.io[0].res; |
| 338 | unsigned int csa; |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 339 | |
| 340 | pcmcia_unregister_socket(&cf->socket); |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 341 | if (board->irq_pin) |
| 342 | free_irq(board->irq_pin, cf); |
| 343 | free_irq(board->det_pin, cf); |
| 344 | device_init_wakeup(&pdev->dev, 0); |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 345 | iounmap((void __iomem *) cf->socket.io_offset); |
David Brownell | 2c53620 | 2006-04-14 18:05:38 -0700 | [diff] [blame] | 346 | release_mem_region(io->start, io->end + 1 - io->start); |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 347 | |
| 348 | csa = at91_sys_read(AT91_EBI_CSA); |
| 349 | at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A); |
| 350 | |
| 351 | kfree(cf); |
| 352 | return 0; |
| 353 | } |
| 354 | |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 355 | #ifdef CONFIG_PM |
| 356 | |
| 357 | static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg) |
| 358 | { |
| 359 | struct at91_cf_socket *cf = platform_get_drvdata(pdev); |
| 360 | struct at91_cf_data *board = cf->board; |
| 361 | |
| 362 | pcmcia_socket_dev_suspend(&pdev->dev, mesg); |
| 363 | if (device_may_wakeup(&pdev->dev)) |
| 364 | enable_irq_wake(board->det_pin); |
| 365 | else { |
| 366 | disable_irq_wake(board->det_pin); |
| 367 | disable_irq(board->det_pin); |
| 368 | } |
| 369 | if (board->irq_pin) |
| 370 | disable_irq(board->irq_pin); |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | static int at91_cf_resume(struct platform_device *pdev) |
| 375 | { |
| 376 | struct at91_cf_socket *cf = platform_get_drvdata(pdev); |
| 377 | struct at91_cf_data *board = cf->board; |
| 378 | |
| 379 | if (board->irq_pin) |
| 380 | enable_irq(board->irq_pin); |
| 381 | if (!device_may_wakeup(&pdev->dev)) |
| 382 | enable_irq(board->det_pin); |
| 383 | pcmcia_socket_dev_resume(&pdev->dev); |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | #else |
| 388 | #define at91_cf_suspend NULL |
| 389 | #define at91_cf_resume NULL |
| 390 | #endif |
| 391 | |
| 392 | static struct platform_driver at91_cf_driver = { |
| 393 | .driver = { |
| 394 | .name = (char *) driver_name, |
| 395 | .owner = THIS_MODULE, |
| 396 | }, |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 397 | .probe = at91_cf_probe, |
| 398 | .remove = __exit_p(at91_cf_remove), |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 399 | .suspend = at91_cf_suspend, |
| 400 | .resume = at91_cf_resume, |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 401 | }; |
| 402 | |
| 403 | /*--------------------------------------------------------------------------*/ |
| 404 | |
| 405 | static int __init at91_cf_init(void) |
| 406 | { |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 407 | return platform_driver_register(&at91_cf_driver); |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 408 | } |
| 409 | module_init(at91_cf_init); |
| 410 | |
| 411 | static void __exit at91_cf_exit(void) |
| 412 | { |
David Brownell | 0db6095 | 2006-04-19 06:37:48 -0700 | [diff] [blame] | 413 | platform_driver_unregister(&at91_cf_driver); |
Andrew Victor | 2c1f3b7 | 2006-02-21 12:56:52 +0200 | [diff] [blame] | 414 | } |
| 415 | module_exit(at91_cf_exit); |
| 416 | |
| 417 | MODULE_DESCRIPTION("AT91 Compact Flash Driver"); |
| 418 | MODULE_AUTHOR("David Brownell"); |
| 419 | MODULE_LICENSE("GPL"); |