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1// SPDX-License-Identifier: GPL-2.0-only2/*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 0x40000029#define IO_MAP_SIZE 0x100030 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 irq37 * 204: reset (high-act)38 * 205: buffer enable (low-act)39 * 208/209: card voltage key (00,01,10,11)40 * 210: battwarn41 * 211: batdead42 * 214: power (low-act)43 */44#define GPIO_CDA 045#define GPIO_CDB 146#define GPIO_CARDIRQ 447#define GPIO_RESET 20448#define GPIO_OUTEN 20549#define GPIO_VSL 20850#define GPIO_VSH 20951#define GPIO_BATTDEAD 21052#define GPIO_BATTWARN 21153#define GPIO_POWER 21454 55struct 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 69static 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 78static 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 115static 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 156static 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 171static int xxs1500_pcmcia_sock_suspend(struct pcmcia_socket *skt)172{173 return 0;174}175 176static 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 187static 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 else195 map->static_start = sock->phys_mem + map->card_start;196 197 return 0;198}199 200static 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 209static 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 access248 * the IO registers. Since mips_io_port_base is added249 * to the access address of the mips implementation of250 * inb/outb, we need to subtract it here because we want251 * to access the I/O or MEM address directly, without252 * 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 an275 * 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 295out2:296 free_irq(gpio_to_irq(GPIO_CDA), sock);297out1:298 iounmap((void *)(sock->virt_io + (u32)mips_io_port_base));299out0:300 kfree(sock);301 return ret;302}303 304static void 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 314static struct platform_driver xxs1500_pcmcia_socket_driver = {315 .driver = {316 .name = "xxs1500_pcmcia",317 },318 .probe = xxs1500_pcmcia_probe,319 .remove_new = xxs1500_pcmcia_remove,320};321 322module_platform_driver(xxs1500_pcmcia_socket_driver);323 324MODULE_LICENSE("GPL");325MODULE_DESCRIPTION("PCMCIA Socket Services for MyCable XXS1500 systems");326MODULE_AUTHOR("Manuel Lauss");327