1 /* 2 * PCMCIA socket code for the MyCable XXS1500 system. 3 * 4 * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com> 5 * 6 */ 7 8 #include <linux/delay.h> 9 #include <linux/gpio.h> 10 #include <linux/interrupt.h> 11 #include <linux/io.h> 12 #include <linux/ioport.h> 13 #include <linux/mm.h> 14 #include <linux/platform_device.h> 15 #include <linux/pm.h> 16 #include <linux/resource.h> 17 #include <linux/slab.h> 18 #include <linux/spinlock.h> 19 20 #include <pcmcia/ss.h> 21 #include <pcmcia/cistpl.h> 22 23 #include <asm/irq.h> 24 #include <asm/mach-au1x00/au1000.h> 25 26 #define MEM_MAP_SIZE 0x400000 27 #define IO_MAP_SIZE 0x1000 28 29 30 /* 31 * 3.3V cards only; all interfacing is done via gpios: 32 * 33 * 0/1: carddetect (00 = card present, xx = huh) 34 * 4: card irq 35 * 204: reset (high-act) 36 * 205: buffer enable (low-act) 37 * 208/209: card voltage key (00,01,10,11) 38 * 210: battwarn 39 * 211: batdead 40 * 214: power (low-act) 41 */ 42 #define GPIO_CDA 0 43 #define GPIO_CDB 1 44 #define GPIO_CARDIRQ 4 45 #define GPIO_RESET 204 46 #define GPIO_OUTEN 205 47 #define GPIO_VSL 208 48 #define GPIO_VSH 209 49 #define GPIO_BATTDEAD 210 50 #define GPIO_BATTWARN 211 51 #define GPIO_POWER 214 52 53 struct xxs1500_pcmcia_sock { 54 struct pcmcia_socket socket; 55 void *virt_io; 56 57 phys_addr_t phys_io; 58 phys_addr_t phys_attr; 59 phys_addr_t phys_mem; 60 61 /* previous flags for set_socket() */ 62 unsigned int old_flags; 63 }; 64 65 #define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket) 66 67 static irqreturn_t cdirq(int irq, void *data) 68 { 69 struct xxs1500_pcmcia_sock *sock = data; 70 71 pcmcia_parse_events(&sock->socket, SS_DETECT); 72 73 return IRQ_HANDLED; 74 } 75 76 static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt, 77 struct socket_state_t *state) 78 { 79 struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); 80 unsigned int changed; 81 82 /* power control */ 83 switch (state->Vcc) { 84 case 0: 85 gpio_set_value(GPIO_POWER, 1); /* power off */ 86 break; 87 case 33: 88 gpio_set_value(GPIO_POWER, 0); /* power on */ 89 break; 90 case 50: 91 default: 92 return -EINVAL; 93 } 94 95 changed = state->flags ^ sock->old_flags; 96 97 if (changed & SS_RESET) { 98 if (state->flags & SS_RESET) { 99 gpio_set_value(GPIO_RESET, 1); /* assert reset */ 100 gpio_set_value(GPIO_OUTEN, 1); /* buffers off */ 101 } else { 102 gpio_set_value(GPIO_RESET, 0); /* deassert reset */ 103 gpio_set_value(GPIO_OUTEN, 0); /* buffers on */ 104 msleep(500); 105 } 106 } 107 108 sock->old_flags = state->flags; 109 110 return 0; 111 } 112 113 static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt, 114 unsigned int *value) 115 { 116 unsigned int status; 117 int i; 118 119 status = 0; 120 121 /* check carddetects: GPIO[0:1] must both be low */ 122 if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB)) 123 status |= SS_DETECT; 124 125 /* determine card voltage: GPIO[208:209] binary value */ 126 i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1); 127 128 switch (i) { 129 case 0: 130 case 1: 131 case 2: 132 status |= SS_3VCARD; /* 3V card */ 133 break; 134 case 3: /* 5V card, unsupported */ 135 default: 136 status |= SS_XVCARD; /* treated as unsupported in core */ 137 } 138 139 /* GPIO214: low active power switch */ 140 status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON; 141 142 /* GPIO204: high-active reset line */ 143 status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY; 144 145 /* other stuff */ 146 status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD; 147 status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN; 148 149 *value = status; 150 151 return 0; 152 } 153 154 static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt) 155 { 156 gpio_direction_input(GPIO_CDA); 157 gpio_direction_input(GPIO_CDB); 158 gpio_direction_input(GPIO_VSL); 159 gpio_direction_input(GPIO_VSH); 160 gpio_direction_input(GPIO_BATTDEAD); 161 gpio_direction_input(GPIO_BATTWARN); 162 gpio_direction_output(GPIO_RESET, 1); /* assert reset */ 163 gpio_direction_output(GPIO_OUTEN, 1); /* disable buffers */ 164 gpio_direction_output(GPIO_POWER, 1); /* power off */ 165 166 return 0; 167 } 168 169 static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt) 170 { 171 return 0; 172 } 173 174 static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt, 175 struct pccard_io_map *map) 176 { 177 struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); 178 179 map->start = (u32)sock->virt_io; 180 map->stop = map->start + IO_MAP_SIZE; 181 182 return 0; 183 } 184 185 static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt, 186 struct pccard_mem_map *map) 187 { 188 struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); 189 190 if (map->flags & MAP_ATTRIB) 191 map->static_start = sock->phys_attr + map->card_start; 192 else 193 map->static_start = sock->phys_mem + map->card_start; 194 195 return 0; 196 } 197 198 static struct pccard_operations xxs1500_pcmcia_operations = { 199 .init = xxs1500_pcmcia_sock_init, 200 .suspend = xxs1500_pcmcia_sock_suspend, 201 .get_status = xxs1500_pcmcia_get_status, 202 .set_socket = xxs1500_pcmcia_configure, 203 .set_io_map = au1x00_pcmcia_set_io_map, 204 .set_mem_map = au1x00_pcmcia_set_mem_map, 205 }; 206 207 static int __devinit xxs1500_pcmcia_probe(struct platform_device *pdev) 208 { 209 struct xxs1500_pcmcia_sock *sock; 210 struct resource *r; 211 int ret, irq; 212 213 sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL); 214 if (!sock) 215 return -ENOMEM; 216 217 ret = -ENODEV; 218 219 /* 36bit PCMCIA Attribute area address */ 220 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr"); 221 if (!r) { 222 dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n"); 223 goto out0; 224 } 225 sock->phys_attr = r->start; 226 227 /* 36bit PCMCIA Memory area address */ 228 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem"); 229 if (!r) { 230 dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n"); 231 goto out0; 232 } 233 sock->phys_mem = r->start; 234 235 /* 36bit PCMCIA IO area address */ 236 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io"); 237 if (!r) { 238 dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n"); 239 goto out0; 240 } 241 sock->phys_io = r->start; 242 243 244 /* 245 * PCMCIA client drivers use the inb/outb macros to access 246 * the IO registers. Since mips_io_port_base is added 247 * to the access address of the mips implementation of 248 * inb/outb, we need to subtract it here because we want 249 * to access the I/O or MEM address directly, without 250 * going through this "mips_io_port_base" mechanism. 251 */ 252 sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) - 253 mips_io_port_base); 254 255 if (!sock->virt_io) { 256 dev_err(&pdev->dev, "cannot remap IO area\n"); 257 ret = -ENOMEM; 258 goto out0; 259 } 260 261 sock->socket.ops = &xxs1500_pcmcia_operations; 262 sock->socket.owner = THIS_MODULE; 263 sock->socket.pci_irq = gpio_to_irq(GPIO_CARDIRQ); 264 sock->socket.features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD; 265 sock->socket.map_size = MEM_MAP_SIZE; 266 sock->socket.io_offset = (unsigned long)sock->virt_io; 267 sock->socket.dev.parent = &pdev->dev; 268 sock->socket.resource_ops = &pccard_static_ops; 269 270 platform_set_drvdata(pdev, sock); 271 272 /* setup carddetect irq: use one of the 2 GPIOs as an 273 * edge detector. 274 */ 275 irq = gpio_to_irq(GPIO_CDA); 276 irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH); 277 ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock); 278 if (ret) { 279 dev_err(&pdev->dev, "cannot setup cd irq\n"); 280 goto out1; 281 } 282 283 ret = pcmcia_register_socket(&sock->socket); 284 if (ret) { 285 dev_err(&pdev->dev, "failed to register\n"); 286 goto out2; 287 } 288 289 printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n"); 290 291 return 0; 292 293 out2: 294 free_irq(gpio_to_irq(GPIO_CDA), sock); 295 out1: 296 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base)); 297 out0: 298 kfree(sock); 299 return ret; 300 } 301 302 static int __devexit xxs1500_pcmcia_remove(struct platform_device *pdev) 303 { 304 struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev); 305 306 pcmcia_unregister_socket(&sock->socket); 307 free_irq(gpio_to_irq(GPIO_CDA), sock); 308 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base)); 309 kfree(sock); 310 311 return 0; 312 } 313 314 static struct platform_driver xxs1500_pcmcia_socket_driver = { 315 .driver = { 316 .name = "xxs1500_pcmcia", 317 .owner = THIS_MODULE, 318 }, 319 .probe = xxs1500_pcmcia_probe, 320 .remove = __devexit_p(xxs1500_pcmcia_remove), 321 }; 322 323 module_platform_driver(xxs1500_pcmcia_socket_driver); 324 325 MODULE_LICENSE("GPL"); 326 MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems"); 327 MODULE_AUTHOR("Manuel Lauss"); 328