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