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(unsigned long _cf) 84 { 85 struct omap_cf_socket *cf = (void *) _cf; 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 omap_cf_timer((unsigned long)_cf); 106 return IRQ_HANDLED; 107 } 108 109 static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp) 110 { 111 if (!sp) 112 return -EINVAL; 113 114 /* NOTE CF is always 3VCARD */ 115 if (omap_cf_present()) { 116 struct omap_cf_socket *cf; 117 118 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD; 119 cf = container_of(s, struct omap_cf_socket, socket); 120 s->pcmcia_irq = 0; 121 s->pci_irq = cf->irq; 122 } else 123 *sp = 0; 124 return 0; 125 } 126 127 static int 128 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) 129 { 130 u16 control; 131 132 /* REVISIT some non-OSK boards may support power switching */ 133 switch (s->Vcc) { 134 case 0: 135 case 33: 136 break; 137 default: 138 return -EINVAL; 139 } 140 141 control = omap_readw(CF_CONTROL); 142 if (s->flags & SS_RESET) 143 omap_writew(CF_CONTROL_RESET, CF_CONTROL); 144 else 145 omap_writew(0, CF_CONTROL); 146 147 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n", 148 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask); 149 150 return 0; 151 } 152 153 static int omap_cf_ss_suspend(struct pcmcia_socket *s) 154 { 155 pr_debug("%s: %s\n", driver_name, __func__); 156 return omap_cf_set_socket(s, &dead_socket); 157 } 158 159 /* regions are 2K each: mem, attrib, io (and reserved-for-ide) */ 160 161 static int 162 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) 163 { 164 struct omap_cf_socket *cf; 165 166 cf = container_of(s, struct omap_cf_socket, socket); 167 io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; 168 io->start = cf->phys_cf + SZ_4K; 169 io->stop = io->start + SZ_2K - 1; 170 return 0; 171 } 172 173 static int 174 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) 175 { 176 struct omap_cf_socket *cf; 177 178 if (map->card_start) 179 return -EINVAL; 180 cf = container_of(s, struct omap_cf_socket, socket); 181 map->static_start = cf->phys_cf; 182 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; 183 if (map->flags & MAP_ATTRIB) 184 map->static_start += SZ_2K; 185 return 0; 186 } 187 188 static struct pccard_operations omap_cf_ops = { 189 .init = omap_cf_ss_init, 190 .suspend = omap_cf_ss_suspend, 191 .get_status = omap_cf_get_status, 192 .set_socket = omap_cf_set_socket, 193 .set_io_map = omap_cf_set_io_map, 194 .set_mem_map = omap_cf_set_mem_map, 195 }; 196 197 /*--------------------------------------------------------------------------*/ 198 199 /* 200 * NOTE: right now the only board-specific platform_data is 201 * "what chipselect is used". Boards could want more. 202 */ 203 204 static int __init omap_cf_probe(struct platform_device *pdev) 205 { 206 unsigned seg; 207 struct omap_cf_socket *cf; 208 int irq; 209 int status; 210 211 seg = (int) pdev->dev.platform_data; 212 if (seg == 0 || seg > 3) 213 return -ENODEV; 214 215 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */ 216 irq = platform_get_irq(pdev, 0); 217 if (irq < 0) 218 return -EINVAL; 219 220 cf = kzalloc(sizeof *cf, GFP_KERNEL); 221 if (!cf) 222 return -ENOMEM; 223 setup_timer(&cf->timer, omap_cf_timer, (unsigned long)cf); 224 225 cf->pdev = pdev; 226 platform_set_drvdata(pdev, cf); 227 228 /* this primarily just shuts up irq handling noise */ 229 status = request_irq(irq, omap_cf_irq, IRQF_SHARED, 230 driver_name, cf); 231 if (status < 0) 232 goto fail0; 233 cf->irq = irq; 234 cf->socket.pci_irq = irq; 235 236 switch (seg) { 237 /* NOTE: CS0 could be configured too ... */ 238 case 1: 239 cf->phys_cf = OMAP_CS1_PHYS; 240 break; 241 case 2: 242 cf->phys_cf = OMAP_CS2_PHYS; 243 break; 244 case 3: 245 cf->phys_cf = omap_cs3_phys(); 246 break; 247 default: 248 goto fail1; 249 } 250 cf->iomem.start = cf->phys_cf; 251 cf->iomem.end = cf->iomem.end + SZ_8K - 1; 252 cf->iomem.flags = IORESOURCE_MEM; 253 254 /* pcmcia layer only remaps "real" memory */ 255 cf->socket.io_offset = (unsigned long) 256 ioremap(cf->phys_cf + SZ_4K, SZ_2K); 257 if (!cf->socket.io_offset) 258 goto fail1; 259 260 if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) 261 goto fail1; 262 263 /* NOTE: CF conflicts with MMC1 */ 264 omap_cfg_reg(W11_1610_CF_CD1); 265 omap_cfg_reg(P11_1610_CF_CD2); 266 omap_cfg_reg(R11_1610_CF_IOIS16); 267 omap_cfg_reg(V10_1610_CF_IREQ); 268 omap_cfg_reg(W10_1610_CF_RESET); 269 270 omap_writew(~(1 << seg), CF_CFG); 271 272 pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq); 273 274 /* NOTE: better EMIFS setup might support more cards; but the 275 * TRM only shows how to affect regular flash signals, not their 276 * CF/PCMCIA variants... 277 */ 278 pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name, 279 seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg))); 280 omap_writel(0x0004a1b3, EMIFS_CCS(seg)); /* synch mode 4 etc */ 281 omap_writel(0x00000000, EMIFS_ACS(seg)); /* OE hold/setup */ 282 283 /* CF uses armxor_ck, which is "always" available */ 284 285 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name, 286 omap_readw(CF_STATUS), omap_readw(CF_CFG), 287 omap_readw(CF_CONTROL), 288 omap_cf_present() ? "present" : "(not present)"); 289 290 cf->socket.owner = THIS_MODULE; 291 cf->socket.dev.parent = &pdev->dev; 292 cf->socket.ops = &omap_cf_ops; 293 cf->socket.resource_ops = &pccard_static_ops; 294 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP 295 | SS_CAP_MEM_ALIGN; 296 cf->socket.map_size = SZ_2K; 297 cf->socket.io[0].res = &cf->iomem; 298 299 status = pcmcia_register_socket(&cf->socket); 300 if (status < 0) 301 goto fail2; 302 303 cf->active = 1; 304 mod_timer(&cf->timer, jiffies + POLL_INTERVAL); 305 return 0; 306 307 fail2: 308 release_mem_region(cf->phys_cf, SZ_8K); 309 fail1: 310 if (cf->socket.io_offset) 311 iounmap((void __iomem *) cf->socket.io_offset); 312 free_irq(irq, cf); 313 fail0: 314 kfree(cf); 315 return status; 316 } 317 318 static int __exit omap_cf_remove(struct platform_device *pdev) 319 { 320 struct omap_cf_socket *cf = platform_get_drvdata(pdev); 321 322 cf->active = 0; 323 pcmcia_unregister_socket(&cf->socket); 324 del_timer_sync(&cf->timer); 325 iounmap((void __iomem *) cf->socket.io_offset); 326 release_mem_region(cf->phys_cf, SZ_8K); 327 free_irq(cf->irq, cf); 328 kfree(cf); 329 return 0; 330 } 331 332 static struct platform_driver omap_cf_driver = { 333 .driver = { 334 .name = (char *) driver_name, 335 }, 336 .remove = __exit_p(omap_cf_remove), 337 }; 338 339 static int __init omap_cf_init(void) 340 { 341 if (cpu_is_omap16xx()) 342 return platform_driver_probe(&omap_cf_driver, omap_cf_probe); 343 return -ENODEV; 344 } 345 346 static void __exit omap_cf_exit(void) 347 { 348 if (cpu_is_omap16xx()) 349 platform_driver_unregister(&omap_cf_driver); 350 } 351 352 module_init(omap_cf_init); 353 module_exit(omap_cf_exit); 354 355 MODULE_DESCRIPTION("OMAP CF Driver"); 356 MODULE_LICENSE("GPL"); 357 MODULE_ALIAS("platform:omap_cf"); 358