1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * omap_cf.c -- OMAP 16xx CompactFlash controller driver 4 * 5 * Copyright (c) 2005 David Brownell 6 */ 7 8 #include <linux/module.h> 9 #include <linux/kernel.h> 10 #include <linux/platform_device.h> 11 #include <linux/errno.h> 12 #include <linux/init.h> 13 #include <linux/delay.h> 14 #include <linux/interrupt.h> 15 #include <linux/slab.h> 16 17 #include <pcmcia/ss.h> 18 19 #include <asm/io.h> 20 #include <linux/sizes.h> 21 22 #include <linux/soc/ti/omap1-io.h> 23 #include <linux/soc/ti/omap1-soc.h> 24 #include <linux/soc/ti/omap1-mux.h> 25 26 /* NOTE: don't expect this to support many I/O cards. The 16xx chips have 27 * hard-wired timings to support Compact Flash memory cards; they won't work 28 * with various other devices (like WLAN adapters) without some external 29 * logic to help out. 30 * 31 * NOTE: CF controller docs disagree with address space docs as to where 32 * CF_BASE really lives; this is a doc erratum. 33 */ 34 #define CF_BASE 0xfffe2800 35 36 /* status; read after IRQ */ 37 #define CF_STATUS (CF_BASE + 0x00) 38 # define CF_STATUS_BAD_READ (1 << 2) 39 # define CF_STATUS_BAD_WRITE (1 << 1) 40 # define CF_STATUS_CARD_DETECT (1 << 0) 41 42 /* which chipselect (CS0..CS3) is used for CF (active low) */ 43 #define CF_CFG (CF_BASE + 0x02) 44 45 /* card reset */ 46 #define CF_CONTROL (CF_BASE + 0x04) 47 # define CF_CONTROL_RESET (1 << 0) 48 49 #define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT)) 50 51 /*--------------------------------------------------------------------------*/ 52 53 static const char driver_name[] = "omap_cf"; 54 55 struct omap_cf_socket { 56 struct pcmcia_socket socket; 57 58 struct timer_list timer; 59 unsigned present:1; 60 unsigned active:1; 61 62 struct platform_device *pdev; 63 unsigned long phys_cf; 64 u_int irq; 65 struct resource iomem; 66 }; 67 68 #define POLL_INTERVAL (2 * HZ) 69 70 /*--------------------------------------------------------------------------*/ 71 72 static int omap_cf_ss_init(struct pcmcia_socket *s) 73 { 74 return 0; 75 } 76 77 /* the timer is primarily to kick this socket's pccardd */ 78 static void omap_cf_timer(struct timer_list *t) 79 { 80 struct omap_cf_socket *cf = from_timer(cf, t, timer); 81 unsigned present = omap_cf_present(); 82 83 if (present != cf->present) { 84 cf->present = present; 85 pr_debug("%s: card %s\n", driver_name, 86 present ? "present" : "gone"); 87 pcmcia_parse_events(&cf->socket, SS_DETECT); 88 } 89 90 if (cf->active) 91 mod_timer(&cf->timer, jiffies + POLL_INTERVAL); 92 } 93 94 /* This irq handler prevents "irqNNN: nobody cared" messages as drivers 95 * claim the card's IRQ. It may also detect some card insertions, but 96 * not removals; it can't always eliminate timer irqs. 97 */ 98 static irqreturn_t omap_cf_irq(int irq, void *_cf) 99 { 100 struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf; 101 102 omap_cf_timer(&cf->timer); 103 return IRQ_HANDLED; 104 } 105 106 static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp) 107 { 108 if (!sp) 109 return -EINVAL; 110 111 /* NOTE CF is always 3VCARD */ 112 if (omap_cf_present()) { 113 struct omap_cf_socket *cf; 114 115 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD; 116 cf = container_of(s, struct omap_cf_socket, socket); 117 s->pcmcia_irq = 0; 118 s->pci_irq = cf->irq; 119 } else 120 *sp = 0; 121 return 0; 122 } 123 124 static int 125 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s) 126 { 127 /* REVISIT some non-OSK boards may support power switching */ 128 switch (s->Vcc) { 129 case 0: 130 case 33: 131 break; 132 default: 133 return -EINVAL; 134 } 135 136 omap_readw(CF_CONTROL); 137 if (s->flags & SS_RESET) 138 omap_writew(CF_CONTROL_RESET, CF_CONTROL); 139 else 140 omap_writew(0, CF_CONTROL); 141 142 pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n", 143 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask); 144 145 return 0; 146 } 147 148 static int omap_cf_ss_suspend(struct pcmcia_socket *s) 149 { 150 pr_debug("%s: %s\n", driver_name, __func__); 151 return omap_cf_set_socket(s, &dead_socket); 152 } 153 154 /* regions are 2K each: mem, attrib, io (and reserved-for-ide) */ 155 156 static int 157 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io) 158 { 159 struct omap_cf_socket *cf; 160 161 cf = container_of(s, struct omap_cf_socket, socket); 162 io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; 163 io->start = cf->phys_cf + SZ_4K; 164 io->stop = io->start + SZ_2K - 1; 165 return 0; 166 } 167 168 static int 169 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map) 170 { 171 struct omap_cf_socket *cf; 172 173 if (map->card_start) 174 return -EINVAL; 175 cf = container_of(s, struct omap_cf_socket, socket); 176 map->static_start = cf->phys_cf; 177 map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT; 178 if (map->flags & MAP_ATTRIB) 179 map->static_start += SZ_2K; 180 return 0; 181 } 182 183 static struct pccard_operations omap_cf_ops = { 184 .init = omap_cf_ss_init, 185 .suspend = omap_cf_ss_suspend, 186 .get_status = omap_cf_get_status, 187 .set_socket = omap_cf_set_socket, 188 .set_io_map = omap_cf_set_io_map, 189 .set_mem_map = omap_cf_set_mem_map, 190 }; 191 192 /*--------------------------------------------------------------------------*/ 193 194 /* 195 * NOTE: right now the only board-specific platform_data is 196 * "what chipselect is used". Boards could want more. 197 */ 198 199 static int __init omap_cf_probe(struct platform_device *pdev) 200 { 201 unsigned seg; 202 struct omap_cf_socket *cf; 203 int irq; 204 int status; 205 struct resource *res; 206 struct resource iospace = DEFINE_RES_IO(SZ_64, SZ_4K); 207 208 seg = (int) pdev->dev.platform_data; 209 if (seg == 0 || seg > 3) 210 return -ENODEV; 211 212 /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */ 213 irq = platform_get_irq(pdev, 0); 214 if (irq < 0) 215 return -EINVAL; 216 217 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 218 219 cf = kzalloc(sizeof *cf, GFP_KERNEL); 220 if (!cf) 221 return -ENOMEM; 222 timer_setup(&cf->timer, omap_cf_timer, 0); 223 224 cf->pdev = pdev; 225 platform_set_drvdata(pdev, cf); 226 227 /* this primarily just shuts up irq handling noise */ 228 status = request_irq(irq, omap_cf_irq, IRQF_SHARED, 229 driver_name, cf); 230 if (status < 0) 231 goto fail0; 232 cf->irq = irq; 233 cf->socket.pci_irq = irq; 234 cf->phys_cf = res->start; 235 236 /* pcmcia layer only remaps "real" memory */ 237 cf->socket.io_offset = iospace.start; 238 status = pci_remap_iospace(&iospace, cf->phys_cf + SZ_4K); 239 if (status) { 240 status = -ENOMEM; 241 goto fail1; 242 } 243 244 if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name)) { 245 status = -ENXIO; 246 goto fail1; 247 } 248 249 /* NOTE: CF conflicts with MMC1 */ 250 omap_cfg_reg(W11_1610_CF_CD1); 251 omap_cfg_reg(P11_1610_CF_CD2); 252 omap_cfg_reg(R11_1610_CF_IOIS16); 253 omap_cfg_reg(V10_1610_CF_IREQ); 254 omap_cfg_reg(W10_1610_CF_RESET); 255 256 omap_writew(~(1 << seg), CF_CFG); 257 258 pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq); 259 260 /* CF uses armxor_ck, which is "always" available */ 261 262 pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name, 263 omap_readw(CF_STATUS), omap_readw(CF_CFG), 264 omap_readw(CF_CONTROL), 265 omap_cf_present() ? "present" : "(not present)"); 266 267 cf->socket.owner = THIS_MODULE; 268 cf->socket.dev.parent = &pdev->dev; 269 cf->socket.ops = &omap_cf_ops; 270 cf->socket.resource_ops = &pccard_static_ops; 271 cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP 272 | SS_CAP_MEM_ALIGN; 273 cf->socket.map_size = SZ_2K; 274 cf->socket.io[0].res = &cf->iomem; 275 276 status = pcmcia_register_socket(&cf->socket); 277 if (status < 0) 278 goto fail2; 279 280 cf->active = 1; 281 mod_timer(&cf->timer, jiffies + POLL_INTERVAL); 282 return 0; 283 284 fail2: 285 release_mem_region(cf->phys_cf, SZ_8K); 286 fail1: 287 free_irq(irq, cf); 288 fail0: 289 kfree(cf); 290 return status; 291 } 292 293 static int __exit omap_cf_remove(struct platform_device *pdev) 294 { 295 struct omap_cf_socket *cf = platform_get_drvdata(pdev); 296 297 cf->active = 0; 298 pcmcia_unregister_socket(&cf->socket); 299 del_timer_sync(&cf->timer); 300 release_mem_region(cf->phys_cf, SZ_8K); 301 free_irq(cf->irq, cf); 302 kfree(cf); 303 return 0; 304 } 305 306 static struct platform_driver omap_cf_driver = { 307 .driver = { 308 .name = driver_name, 309 }, 310 .remove = __exit_p(omap_cf_remove), 311 }; 312 313 static int __init omap_cf_init(void) 314 { 315 if (cpu_is_omap16xx()) 316 return platform_driver_probe(&omap_cf_driver, omap_cf_probe); 317 return -ENODEV; 318 } 319 320 static void __exit omap_cf_exit(void) 321 { 322 if (cpu_is_omap16xx()) 323 platform_driver_unregister(&omap_cf_driver); 324 } 325 326 module_init(omap_cf_init); 327 module_exit(omap_cf_exit); 328 329 MODULE_DESCRIPTION("OMAP CF Driver"); 330 MODULE_LICENSE("GPL"); 331 MODULE_ALIAS("platform:omap_cf"); 332