1 /* 2 * omap_cf.c -- OMAP 16xx 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/platform_device.h> 15 #include <linux/errno.h> 16 #include <linux/init.h> 17 #include <linux/delay.h> 18 #include <linux/interrupt.h> 19 #include <linux/slab.h> 20 21 #include <pcmcia/ss.h> 22 23 #include <mach/hardware.h> 24 #include <asm/io.h> 25 #include <asm/sizes.h> 26 27 #include <mach/mux.h> 28 #include <mach/tc.h> 29 30 31 /* NOTE: don't expect this to support many I/O cards. The 16xx chips have 32 * hard-wired timings to support Compact Flash memory cards; they won't work 33 * with various other devices (like WLAN adapters) without some external 34 * logic to help out. 35 * 36 * NOTE: CF controller docs disagree with address space docs as to where 37 * CF_BASE really lives; this is a doc erratum. 38 */ 39 #define CF_BASE 0xfffe2800 40 41 /* status; read after IRQ */ 42 #define CF_STATUS (CF_BASE + 0x00) 43 # define CF_STATUS_BAD_READ (1 << 2) 44 # define CF_STATUS_BAD_WRITE (1 << 1) 45 # define CF_STATUS_CARD_DETECT (1 << 0) 46 47 /* which chipselect (CS0..CS3) is used for CF (active low) */ 48 #define CF_CFG (CF_BASE + 0x02) 49 50 /* card reset */ 51 #define CF_CONTROL (CF_BASE + 0x04) 52 # define CF_CONTROL_RESET (1 << 0) 53 54 #define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT)) 55 56 /*--------------------------------------------------------------------------*/ 57 58 static const char driver_name[] = "omap_cf"; 59 60 struct omap_cf_socket { 61 struct pcmcia_socket socket; 62 63 struct timer_list timer; 64 unsigned present:1; 65 unsigned active:1; 66 67 struct platform_device *pdev; 68 unsigned long phys_cf; 69 u_int irq; 70 struct resource iomem; 71 }; 72 73 #define POLL_INTERVAL (2 * HZ) 74 75 /*--------------------------------------------------------------------------*/ 76 77 static int omap_cf_ss_init(struct pcmcia_socket *s) 78 { 79 return 0; 80 } 81 82 /* the timer is primarily to kick this socket's pccardd */ 83 static void omap_cf_timer(struct timer_list *t) 84 { 85 struct omap_cf_socket *cf = from_timer(cf, t, timer); 86 unsigned present = omap_cf_present(); 87 88 if (present != cf->present) { 89 cf->present = present; 90 pr_debug("%s: card %s\n", driver_name, 91 present ? "present" : "gone"); 92 pcmcia_parse_events(&cf->socket, SS_DETECT); 93 } 94 95 if (cf->active) 96 mod_timer(&cf->timer, jiffies + POLL_INTERVAL); 97 } 98 99 /* This irq handler prevents "irqNNN: nobody cared" messages as drivers 100 * claim the card's IRQ. It may also detect some card insertions, but 101 * not removals; it can't always eliminate timer irqs. 102 */ 103 static irqreturn_t omap_cf_irq(int irq, void *_cf) 104 { 105 struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf; 106 107 omap_cf_timer(&cf->timer); 108 return IRQ_HANDLED; 109 } 110 111 static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp) 112 { 113 if (!sp) 114 return -EINVAL; 115 116 /* NOTE CF is always 3VCARD */ 117 if (omap_cf_present()) { 118 struct omap_cf_socket *cf; 119 120 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD; 121 cf = container_of(s, struct omap_cf_socket, socket); 122 s->pcmcia_irq = 0; 123 s->pci_irq = cf->irq; 124 } else 125 *sp = 0; 126 return 0; 127 } 128 129 static int 130 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) 131 { 132 u16 control; 133 134 /* REVISIT some non-OSK boards may support power switching */ 135 switch (s->Vcc) { 136 case 0: 137 case 33: 138 break; 139 default: 140 return -EINVAL; 141 } 142 143 control = omap_readw(CF_CONTROL); 144 if (s->flags & SS_RESET) 145 omap_writew(CF_CONTROL_RESET, CF_CONTROL); 146 else 147 omap_writew(0, CF_CONTROL); 148 149 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n", 150 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask); 151 152 return 0; 153 } 154 155 static int omap_cf_ss_suspend(struct pcmcia_socket *s) 156 { 157 pr_debug("%s: %s\n", driver_name, __func__); 158 return omap_cf_set_socket(s, &dead_socket); 159 } 160 161 /* regions are 2K each: mem, attrib, io (and reserved-for-ide) */ 162 163 static int 164 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) 165 { 166 struct omap_cf_socket *cf; 167 168 cf = container_of(s, struct omap_cf_socket, socket); 169 io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; 170 io->start = cf->phys_cf + SZ_4K; 171 io->stop = io->start + SZ_2K - 1; 172 return 0; 173 } 174 175 static int 176 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) 177 { 178 struct omap_cf_socket *cf; 179 180 if (map->card_start) 181 return -EINVAL; 182 cf = container_of(s, struct omap_cf_socket, socket); 183 map->static_start = cf->phys_cf; 184 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; 185 if (map->flags & MAP_ATTRIB) 186 map->static_start += SZ_2K; 187 return 0; 188 } 189 190 static struct pccard_operations omap_cf_ops = { 191 .init = omap_cf_ss_init, 192 .suspend = omap_cf_ss_suspend, 193 .get_status = omap_cf_get_status, 194 .set_socket = omap_cf_set_socket, 195 .set_io_map = omap_cf_set_io_map, 196 .set_mem_map = omap_cf_set_mem_map, 197 }; 198 199 /*--------------------------------------------------------------------------*/ 200 201 /* 202 * NOTE: right now the only board-specific platform_data is 203 * "what chipselect is used". Boards could want more. 204 */ 205 206 static int __init omap_cf_probe(struct platform_device *pdev) 207 { 208 unsigned seg; 209 struct omap_cf_socket *cf; 210 int irq; 211 int status; 212 213 seg = (int) pdev->dev.platform_data; 214 if (seg == 0 || seg > 3) 215 return -ENODEV; 216 217 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */ 218 irq = platform_get_irq(pdev, 0); 219 if (irq < 0) 220 return -EINVAL; 221 222 cf = kzalloc(sizeof *cf, GFP_KERNEL); 223 if (!cf) 224 return -ENOMEM; 225 timer_setup(&cf->timer, omap_cf_timer, 0); 226 227 cf->pdev = pdev; 228 platform_set_drvdata(pdev, cf); 229 230 /* this primarily just shuts up irq handling noise */ 231 status = request_irq(irq, omap_cf_irq, IRQF_SHARED, 232 driver_name, cf); 233 if (status < 0) 234 goto fail0; 235 cf->irq = irq; 236 cf->socket.pci_irq = irq; 237 238 switch (seg) { 239 /* NOTE: CS0 could be configured too ... */ 240 case 1: 241 cf->phys_cf = OMAP_CS1_PHYS; 242 break; 243 case 2: 244 cf->phys_cf = OMAP_CS2_PHYS; 245 break; 246 case 3: 247 cf->phys_cf = omap_cs3_phys(); 248 break; 249 default: 250 goto fail1; 251 } 252 cf->iomem.start = cf->phys_cf; 253 cf->iomem.end = cf->iomem.end + SZ_8K - 1; 254 cf->iomem.flags = IORESOURCE_MEM; 255 256 /* pcmcia layer only remaps "real" memory */ 257 cf->socket.io_offset = (unsigned long) 258 ioremap(cf->phys_cf + SZ_4K, SZ_2K); 259 if (!cf->socket.io_offset) 260 goto fail1; 261 262 if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) 263 goto fail1; 264 265 /* NOTE: CF conflicts with MMC1 */ 266 omap_cfg_reg(W11_1610_CF_CD1); 267 omap_cfg_reg(P11_1610_CF_CD2); 268 omap_cfg_reg(R11_1610_CF_IOIS16); 269 omap_cfg_reg(V10_1610_CF_IREQ); 270 omap_cfg_reg(W10_1610_CF_RESET); 271 272 omap_writew(~(1 << seg), CF_CFG); 273 274 pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq); 275 276 /* NOTE: better EMIFS setup might support more cards; but the 277 * TRM only shows how to affect regular flash signals, not their 278 * CF/PCMCIA variants... 279 */ 280 pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name, 281 seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg))); 282 omap_writel(0x0004a1b3, EMIFS_CCS(seg)); /* synch mode 4 etc */ 283 omap_writel(0x00000000, EMIFS_ACS(seg)); /* OE hold/setup */ 284 285 /* CF uses armxor_ck, which is "always" available */ 286 287 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name, 288 omap_readw(CF_STATUS), omap_readw(CF_CFG), 289 omap_readw(CF_CONTROL), 290 omap_cf_present() ? "present" : "(not present)"); 291 292 cf->socket.owner = THIS_MODULE; 293 cf->socket.dev.parent = &pdev->dev; 294 cf->socket.ops = &omap_cf_ops; 295 cf->socket.resource_ops = &pccard_static_ops; 296 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP 297 | SS_CAP_MEM_ALIGN; 298 cf->socket.map_size = SZ_2K; 299 cf->socket.io[0].res = &cf->iomem; 300 301 status = pcmcia_register_socket(&cf->socket); 302 if (status < 0) 303 goto fail2; 304 305 cf->active = 1; 306 mod_timer(&cf->timer, jiffies + POLL_INTERVAL); 307 return 0; 308 309 fail2: 310 release_mem_region(cf->phys_cf, SZ_8K); 311 fail1: 312 if (cf->socket.io_offset) 313 iounmap((void __iomem *) cf->socket.io_offset); 314 free_irq(irq, cf); 315 fail0: 316 kfree(cf); 317 return status; 318 } 319 320 static int __exit omap_cf_remove(struct platform_device *pdev) 321 { 322 struct omap_cf_socket *cf = platform_get_drvdata(pdev); 323 324 cf->active = 0; 325 pcmcia_unregister_socket(&cf->socket); 326 del_timer_sync(&cf->timer); 327 iounmap((void __iomem *) cf->socket.io_offset); 328 release_mem_region(cf->phys_cf, SZ_8K); 329 free_irq(cf->irq, cf); 330 kfree(cf); 331 return 0; 332 } 333 334 static struct platform_driver omap_cf_driver = { 335 .driver = { 336 .name = (char *) driver_name, 337 }, 338 .remove = __exit_p(omap_cf_remove), 339 }; 340 341 static int __init omap_cf_init(void) 342 { 343 if (cpu_is_omap16xx()) 344 return platform_driver_probe(&omap_cf_driver, omap_cf_probe); 345 return -ENODEV; 346 } 347 348 static void __exit omap_cf_exit(void) 349 { 350 if (cpu_is_omap16xx()) 351 platform_driver_unregister(&omap_cf_driver); 352 } 353 354 module_init(omap_cf_init); 355 module_exit(omap_cf_exit); 356 357 MODULE_DESCRIPTION("OMAP CF Driver"); 358 MODULE_LICENSE("GPL"); 359 MODULE_ALIAS("platform:omap_cf"); 360