1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * PCMCIA socket code for the MyCable XXS1500 system. 4 * 5 * Copyright (c) 2009 Manuel Lauss <manuel.lauss@gmail.com> 6 * 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/gpio.h> 11 #include <linux/interrupt.h> 12 #include <linux/io.h> 13 #include <linux/ioport.h> 14 #include <linux/mm.h> 15 #include <linux/module.h> 16 #include <linux/platform_device.h> 17 #include <linux/pm.h> 18 #include <linux/resource.h> 19 #include <linux/slab.h> 20 #include <linux/spinlock.h> 21 22 #include <pcmcia/ss.h> 23 #include <pcmcia/cistpl.h> 24 25 #include <asm/irq.h> 26 #include <asm/mach-au1x00/au1000.h> 27 28 #define MEM_MAP_SIZE 0x400000 29 #define IO_MAP_SIZE 0x1000 30 31 32 /* 33 * 3.3V cards only; all interfacing is done via gpios: 34 * 35 * 0/1: carddetect (00 = card present, xx = huh) 36 * 4: card irq 37 * 204: reset (high-act) 38 * 205: buffer enable (low-act) 39 * 208/209: card voltage key (00,01,10,11) 40 * 210: battwarn 41 * 211: batdead 42 * 214: power (low-act) 43 */ 44 #define GPIO_CDA 0 45 #define GPIO_CDB 1 46 #define GPIO_CARDIRQ 4 47 #define GPIO_RESET 204 48 #define GPIO_OUTEN 205 49 #define GPIO_VSL 208 50 #define GPIO_VSH 209 51 #define GPIO_BATTDEAD 210 52 #define GPIO_BATTWARN 211 53 #define GPIO_POWER 214 54 55 struct xxs1500_pcmcia_sock { 56 struct pcmcia_socket socket; 57 void *virt_io; 58 59 phys_addr_t phys_io; 60 phys_addr_t phys_attr; 61 phys_addr_t phys_mem; 62 63 /* previous flags for set_socket() */ 64 unsigned int old_flags; 65 }; 66 67 #define to_xxs_socket(x) container_of(x, struct xxs1500_pcmcia_sock, socket) 68 69 static irqreturn_t cdirq(int irq, void *data) 70 { 71 struct xxs1500_pcmcia_sock *sock = data; 72 73 pcmcia_parse_events(&sock->socket, SS_DETECT); 74 75 return IRQ_HANDLED; 76 } 77 78 static int xxs1500_pcmcia_configure(struct pcmcia_socket *skt, 79 struct socket_state_t *state) 80 { 81 struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); 82 unsigned int changed; 83 84 /* power control */ 85 switch (state->Vcc) { 86 case 0: 87 gpio_set_value(GPIO_POWER, 1); /* power off */ 88 break; 89 case 33: 90 gpio_set_value(GPIO_POWER, 0); /* power on */ 91 break; 92 case 50: 93 default: 94 return -EINVAL; 95 } 96 97 changed = state->flags ^ sock->old_flags; 98 99 if (changed & SS_RESET) { 100 if (state->flags & SS_RESET) { 101 gpio_set_value(GPIO_RESET, 1); /* assert reset */ 102 gpio_set_value(GPIO_OUTEN, 1); /* buffers off */ 103 } else { 104 gpio_set_value(GPIO_RESET, 0); /* deassert reset */ 105 gpio_set_value(GPIO_OUTEN, 0); /* buffers on */ 106 msleep(500); 107 } 108 } 109 110 sock->old_flags = state->flags; 111 112 return 0; 113 } 114 115 static int xxs1500_pcmcia_get_status(struct pcmcia_socket *skt, 116 unsigned int *value) 117 { 118 unsigned int status; 119 int i; 120 121 status = 0; 122 123 /* check carddetects: GPIO[0:1] must both be low */ 124 if (!gpio_get_value(GPIO_CDA) && !gpio_get_value(GPIO_CDB)) 125 status |= SS_DETECT; 126 127 /* determine card voltage: GPIO[208:209] binary value */ 128 i = (!!gpio_get_value(GPIO_VSL)) | ((!!gpio_get_value(GPIO_VSH)) << 1); 129 130 switch (i) { 131 case 0: 132 case 1: 133 case 2: 134 status |= SS_3VCARD; /* 3V card */ 135 break; 136 case 3: /* 5V card, unsupported */ 137 default: 138 status |= SS_XVCARD; /* treated as unsupported in core */ 139 } 140 141 /* GPIO214: low active power switch */ 142 status |= gpio_get_value(GPIO_POWER) ? 0 : SS_POWERON; 143 144 /* GPIO204: high-active reset line */ 145 status |= gpio_get_value(GPIO_RESET) ? SS_RESET : SS_READY; 146 147 /* other stuff */ 148 status |= gpio_get_value(GPIO_BATTDEAD) ? 0 : SS_BATDEAD; 149 status |= gpio_get_value(GPIO_BATTWARN) ? 0 : SS_BATWARN; 150 151 *value = status; 152 153 return 0; 154 } 155 156 static int xxs1500_pcmcia_sock_init(struct pcmcia_socket *skt) 157 { 158 gpio_direction_input(GPIO_CDA); 159 gpio_direction_input(GPIO_CDB); 160 gpio_direction_input(GPIO_VSL); 161 gpio_direction_input(GPIO_VSH); 162 gpio_direction_input(GPIO_BATTDEAD); 163 gpio_direction_input(GPIO_BATTWARN); 164 gpio_direction_output(GPIO_RESET, 1); /* assert reset */ 165 gpio_direction_output(GPIO_OUTEN, 1); /* disable buffers */ 166 gpio_direction_output(GPIO_POWER, 1); /* power off */ 167 168 return 0; 169 } 170 171 static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt) 172 { 173 return 0; 174 } 175 176 static int au1x00_pcmcia_set_io_map(struct pcmcia_socket *skt, 177 struct pccard_io_map *map) 178 { 179 struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); 180 181 map->start = (u32)sock->virt_io; 182 map->stop = map->start + IO_MAP_SIZE; 183 184 return 0; 185 } 186 187 static int au1x00_pcmcia_set_mem_map(struct pcmcia_socket *skt, 188 struct pccard_mem_map *map) 189 { 190 struct xxs1500_pcmcia_sock *sock = to_xxs_socket(skt); 191 192 if (map->flags & MAP_ATTRIB) 193 map->static_start = sock->phys_attr + map->card_start; 194 else 195 map->static_start = sock->phys_mem + map->card_start; 196 197 return 0; 198 } 199 200 static struct pccard_operations xxs1500_pcmcia_operations = { 201 .init = xxs1500_pcmcia_sock_init, 202 .suspend = xxs1500_pcmcia_sock_suspend, 203 .get_status = xxs1500_pcmcia_get_status, 204 .set_socket = xxs1500_pcmcia_configure, 205 .set_io_map = au1x00_pcmcia_set_io_map, 206 .set_mem_map = au1x00_pcmcia_set_mem_map, 207 }; 208 209 static int xxs1500_pcmcia_probe(struct platform_device *pdev) 210 { 211 struct xxs1500_pcmcia_sock *sock; 212 struct resource *r; 213 int ret, irq; 214 215 sock = kzalloc(sizeof(struct xxs1500_pcmcia_sock), GFP_KERNEL); 216 if (!sock) 217 return -ENOMEM; 218 219 ret = -ENODEV; 220 221 /* 36bit PCMCIA Attribute area address */ 222 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-attr"); 223 if (!r) { 224 dev_err(&pdev->dev, "missing 'pcmcia-attr' resource!\n"); 225 goto out0; 226 } 227 sock->phys_attr = r->start; 228 229 /* 36bit PCMCIA Memory area address */ 230 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-mem"); 231 if (!r) { 232 dev_err(&pdev->dev, "missing 'pcmcia-mem' resource!\n"); 233 goto out0; 234 } 235 sock->phys_mem = r->start; 236 237 /* 36bit PCMCIA IO area address */ 238 r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcmcia-io"); 239 if (!r) { 240 dev_err(&pdev->dev, "missing 'pcmcia-io' resource!\n"); 241 goto out0; 242 } 243 sock->phys_io = r->start; 244 245 246 /* 247 * PCMCIA client drivers use the inb/outb macros to access 248 * the IO registers. Since mips_io_port_base is added 249 * to the access address of the mips implementation of 250 * inb/outb, we need to subtract it here because we want 251 * to access the I/O or MEM address directly, without 252 * going through this "mips_io_port_base" mechanism. 253 */ 254 sock->virt_io = (void *)(ioremap(sock->phys_io, IO_MAP_SIZE) - 255 mips_io_port_base); 256 257 if (!sock->virt_io) { 258 dev_err(&pdev->dev, "cannot remap IO area\n"); 259 ret = -ENOMEM; 260 goto out0; 261 } 262 263 sock->socket.ops = &xxs1500_pcmcia_operations; 264 sock->socket.owner = THIS_MODULE; 265 sock->socket.pci_irq = gpio_to_irq(GPIO_CARDIRQ); 266 sock->socket.features = SS_CAP_STATIC_MAP | SS_CAP_PCCARD; 267 sock->socket.map_size = MEM_MAP_SIZE; 268 sock->socket.io_offset = (unsigned long)sock->virt_io; 269 sock->socket.dev.parent = &pdev->dev; 270 sock->socket.resource_ops = &pccard_static_ops; 271 272 platform_set_drvdata(pdev, sock); 273 274 /* setup carddetect irq: use one of the 2 GPIOs as an 275 * edge detector. 276 */ 277 irq = gpio_to_irq(GPIO_CDA); 278 irq_set_irq_type(irq, IRQ_TYPE_EDGE_BOTH); 279 ret = request_irq(irq, cdirq, 0, "pcmcia_carddetect", sock); 280 if (ret) { 281 dev_err(&pdev->dev, "cannot setup cd irq\n"); 282 goto out1; 283 } 284 285 ret = pcmcia_register_socket(&sock->socket); 286 if (ret) { 287 dev_err(&pdev->dev, "failed to register\n"); 288 goto out2; 289 } 290 291 printk(KERN_INFO "MyCable XXS1500 PCMCIA socket services\n"); 292 293 return 0; 294 295 out2: 296 free_irq(gpio_to_irq(GPIO_CDA), sock); 297 out1: 298 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base)); 299 out0: 300 kfree(sock); 301 return ret; 302 } 303 304 static int xxs1500_pcmcia_remove(struct platform_device *pdev) 305 { 306 struct xxs1500_pcmcia_sock *sock = platform_get_drvdata(pdev); 307 308 pcmcia_unregister_socket(&sock->socket); 309 free_irq(gpio_to_irq(GPIO_CDA), sock); 310 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base)); 311 kfree(sock); 312 313 return 0; 314 } 315 316 static struct platform_driver xxs1500_pcmcia_socket_driver = { 317 .driver = { 318 .name = "xxs1500_pcmcia", 319 }, 320 .probe = xxs1500_pcmcia_probe, 321 .remove = xxs1500_pcmcia_remove, 322 }; 323 324 module_platform_driver(xxs1500_pcmcia_socket_driver); 325 326 MODULE_LICENSE("GPL"); 327 MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems"); 328 MODULE_AUTHOR("Manuel Lauss"); 329