drivers/pcmcia/pxa2xx_sharpsl.c

   1 /*
   2  * Sharp SL-C7xx Series PCMCIA routines
   3  *
   4  * Copyright (c) 2004-2005 Richard Purdie
   5  *
   6  * Based on Sharp's 2.4 kernel patches and pxa2xx_mainstone.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/errno.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/device.h>
  20
  21 #include <asm/hardware.h>
  22 #include <asm/irq.h>
  23 #include <asm/hardware/scoop.h>
  24 #include <asm/arch/pxa-regs.h>
  25
  26 #include "soc_common.h"
  27
  28 #define NO_KEEP_VS 0x0001
  29
  30 static void sharpsl_pcmcia_init_reset(struct scoop_pcmcia_dev *scoopdev)
  31 {
  32         reset_scoop(scoopdev->dev);
  33         scoopdev->keep_vs = NO_KEEP_VS;
  34         scoopdev->keep_rd = 0;
  35 }
  36
  37 static int sharpsl_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  38 {
  39         int ret;
  40
  41         /*
  42          * Setup default state of GPIO outputs
  43          * before we enable them as outputs.
  44          */
  45         GPSR(GPIO48_nPOE) =
  46                 GPIO_bit(GPIO48_nPOE) |
  47                 GPIO_bit(GPIO49_nPWE) |
  48                 GPIO_bit(GPIO50_nPIOR) |
  49                 GPIO_bit(GPIO51_nPIOW) |
  50                 GPIO_bit(GPIO52_nPCE_1) |
  51                 GPIO_bit(GPIO53_nPCE_2);
  52
  53         pxa_gpio_mode(GPIO48_nPOE_MD);
  54         pxa_gpio_mode(GPIO49_nPWE_MD);
  55         pxa_gpio_mode(GPIO50_nPIOR_MD);
  56         pxa_gpio_mode(GPIO51_nPIOW_MD);
  57         pxa_gpio_mode(GPIO52_nPCE_1_MD);
  58         pxa_gpio_mode(GPIO53_nPCE_2_MD);
  59         pxa_gpio_mode(GPIO54_pSKTSEL_MD);
  60         pxa_gpio_mode(GPIO55_nPREG_MD);
  61         pxa_gpio_mode(GPIO56_nPWAIT_MD);
  62         pxa_gpio_mode(GPIO57_nIOIS16_MD);
  63
  64         /* Register interrupts */
  65         if (scoop_devs[skt->nr].cd_irq >= 0) {
  66                 struct pcmcia_irqs cd_irq;
  67
  68                 cd_irq.sock = skt->nr;
  69                 cd_irq.irq  = scoop_devs[skt->nr].cd_irq;
  70                 cd_irq.str  = scoop_devs[skt->nr].cd_irq_str;
  71                 ret = soc_pcmcia_request_irqs(skt, &cd_irq, 1);
  72
  73                 if (ret) {
  74                         printk(KERN_ERR "Request for Compact Flash IRQ failed\n");
  75                         return ret;
  76                 }
  77         }
  78
  79         skt->irq = scoop_devs[skt->nr].irq;
  80
  81         return 0;
  82 }
  83
  84 static void sharpsl_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  85 {
  86         if (scoop_devs[skt->nr].cd_irq >= 0) {
  87                 struct pcmcia_irqs cd_irq;
  88
  89                 cd_irq.sock = skt->nr;
  90                 cd_irq.irq  = scoop_devs[skt->nr].cd_irq;
  91                 cd_irq.str  = scoop_devs[skt->nr].cd_irq_str;
  92                 soc_pcmcia_free_irqs(skt, &cd_irq, 1);
  93         }
  94 }
  95
  96
  97 static void sharpsl_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  98                                     struct pcmcia_state *state)
  99 {
 100         unsigned short cpr, csr;
 101         struct device *scoop = scoop_devs[skt->nr].dev;
 102
 103         cpr = read_scoop_reg(scoop_devs[skt->nr].dev, SCOOP_CPR);
 104
 105         write_scoop_reg(scoop, SCOOP_IRM, 0x00FF);
 106         write_scoop_reg(scoop, SCOOP_ISR, 0x0000);
 107         write_scoop_reg(scoop, SCOOP_IRM, 0x0000);
 108         csr = read_scoop_reg(scoop, SCOOP_CSR);
 109         if (csr & 0x0004) {
 110                 /* card eject */
 111                 write_scoop_reg(scoop, SCOOP_CDR, 0x0000);
 112                 scoop_devs[skt->nr].keep_vs = NO_KEEP_VS;
 113         }
 114         else if (!(scoop_devs[skt->nr].keep_vs & NO_KEEP_VS)) {
 115                 /* keep vs1,vs2 */
 116                 write_scoop_reg(scoop, SCOOP_CDR, 0x0000);
 117                 csr |= scoop_devs[skt->nr].keep_vs;
 118         }
 119         else if (cpr & 0x0003) {
 120                 /* power on */
 121                 write_scoop_reg(scoop, SCOOP_CDR, 0x0000);
 122                 scoop_devs[skt->nr].keep_vs = (csr & 0x00C0);
 123         }
 124         else {
 125                 /* card detect */
 126                 write_scoop_reg(scoop, SCOOP_CDR, 0x0002);
 127         }
 128
 129         state->detect = (csr & 0x0004) ? 0 : 1;
 130         state->ready  = (csr & 0x0002) ? 1 : 0;
 131         state->bvd1   = (csr & 0x0010) ? 1 : 0;
 132         state->bvd2   = (csr & 0x0020) ? 1 : 0;
 133         state->wrprot = (csr & 0x0008) ? 1 : 0;
 134         state->vs_3v  = (csr & 0x0040) ? 0 : 1;
 135         state->vs_Xv  = (csr & 0x0080) ? 0 : 1;
 136
 137         if ((cpr & 0x0080) && ((cpr & 0x8040) != 0x8040)) {
 138                 printk(KERN_ERR "sharpsl_pcmcia_socket_state(): CPR=%04X, Low voltage!\n", cpr);
 139         }
 140
 141 }
 142
 143
 144 static int sharpsl_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
 145                                        const socket_state_t *state)
 146 {
 147         unsigned long flags;
 148         struct device *scoop = scoop_devs[skt->nr].dev;
 149
 150         unsigned short cpr, ncpr, ccr, nccr, mcr, nmcr, imr, nimr;
 151
 152         switch (state->Vcc) {
 153         case    0:      break;
 154         case    33:     break;
 155         case    50:     break;
 156         default:
 157                  printk(KERN_ERR "sharpsl_pcmcia_configure_socket(): bad Vcc %u\n", state->Vcc);
 158                  return -1;
 159         }
 160
 161         if ((state->Vpp!=state->Vcc) && (state->Vpp!=0)) {
 162                 printk(KERN_ERR "CF slot cannot support Vpp %u\n", state->Vpp);
 163                 return -1;
 164         }
 165
 166         local_irq_save(flags);
 167
 168         nmcr = (mcr = read_scoop_reg(scoop, SCOOP_MCR)) & ~0x0010;
 169         ncpr = (cpr = read_scoop_reg(scoop, SCOOP_CPR)) & ~0x0083;
 170         nccr = (ccr = read_scoop_reg(scoop, SCOOP_CCR)) & ~0x0080;
 171         nimr = (imr = read_scoop_reg(scoop, SCOOP_IMR)) & ~0x003E;
 172
 173         ncpr |= (state->Vcc == 33) ? 0x0001 :
 174                                 (state->Vcc == 50) ? 0x0002 : 0;
 175         nmcr |= (state->flags&SS_IOCARD) ? 0x0010 : 0;
 176         ncpr |= (state->flags&SS_OUTPUT_ENA) ? 0x0080 : 0;
 177         nccr |= (state->flags&SS_RESET)? 0x0080: 0;
 178         nimr |= ((skt->status&SS_DETECT) ? 0x0004 : 0)|
 179                         ((skt->status&SS_READY)  ? 0x0002 : 0)|
 180                         ((skt->status&SS_BATDEAD)? 0x0010 : 0)|
 181                         ((skt->status&SS_BATWARN)? 0x0020 : 0)|
 182                         ((skt->status&SS_STSCHG) ? 0x0010 : 0)|
 183                         ((skt->status&SS_WRPROT) ? 0x0008 : 0);
 184
 185         if (!(ncpr & 0x0003)) {
 186                 scoop_devs[skt->nr].keep_rd = 0;
 187         } else if (!scoop_devs[skt->nr].keep_rd) {
 188                 if (nccr & 0x0080)
 189                         scoop_devs[skt->nr].keep_rd = 1;
 190                 else
 191                         nccr |= 0x0080;
 192         }
 193
 194         if (mcr != nmcr)
 195                 write_scoop_reg(scoop, SCOOP_MCR, nmcr);
 196         if (cpr != ncpr)
 197                 write_scoop_reg(scoop, SCOOP_CPR, ncpr);
 198         if (ccr != nccr)
 199                 write_scoop_reg(scoop, SCOOP_CCR, nccr);
 200         if (imr != nimr)
 201                 write_scoop_reg(scoop, SCOOP_IMR, nimr);
 202
 203         local_irq_restore(flags);
 204
 205         return 0;
 206 }
 207
 208 static void sharpsl_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 209 {
 210         sharpsl_pcmcia_init_reset(&scoop_devs[skt->nr]);
 211
 212         /* Enable interrupt */
 213         write_scoop_reg(scoop_devs[skt->nr].dev, SCOOP_IMR, 0x00C0);
 214         write_scoop_reg(scoop_devs[skt->nr].dev, SCOOP_MCR, 0x0101);
 215         scoop_devs[skt->nr].keep_vs = NO_KEEP_VS;
 216 }
 217
 218 static void sharpsl_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 219 {
 220         /* CF_BUS_OFF */
 221         sharpsl_pcmcia_init_reset(&scoop_devs[skt->nr]);
 222 }
 223
 224 static struct pcmcia_low_level sharpsl_pcmcia_ops = {
 225         .owner                          = THIS_MODULE,
 226         .hw_init                        = sharpsl_pcmcia_hw_init,
 227         .hw_shutdown            = sharpsl_pcmcia_hw_shutdown,
 228         .socket_state           = sharpsl_pcmcia_socket_state,
 229         .configure_socket       = sharpsl_pcmcia_configure_socket,
 230         .socket_init            = sharpsl_pcmcia_socket_init,
 231         .socket_suspend         = sharpsl_pcmcia_socket_suspend,
 232         .first                          = 0,
 233         .nr                                     = 0,
 234 };
 235
 236 static struct platform_device *sharpsl_pcmcia_device;
 237
 238 static int __init sharpsl_pcmcia_init(void)
 239 {
 240         int ret;
 241
 242         sharpsl_pcmcia_ops.nr=scoop_num;
 243         sharpsl_pcmcia_device = kmalloc(sizeof(*sharpsl_pcmcia_device), GFP_KERNEL);
 244         if (!sharpsl_pcmcia_device)
 245                 return -ENOMEM;
 246
 247         memset(sharpsl_pcmcia_device, 0, sizeof(*sharpsl_pcmcia_device));
 248         sharpsl_pcmcia_device->name = "pxa2xx-pcmcia";
 249         sharpsl_pcmcia_device->dev.platform_data = &sharpsl_pcmcia_ops;
 250         sharpsl_pcmcia_device->dev.parent=scoop_devs[0].dev;
 251
 252         ret = platform_device_register(sharpsl_pcmcia_device);
 253         if (ret)
 254                 kfree(sharpsl_pcmcia_device);
 255
 256         return ret;
 257 }
 258
 259 static void __exit sharpsl_pcmcia_exit(void)
 260 {
 261         /*
 262          * This call is supposed to free our sharpsl_pcmcia_device.
 263          * Unfortunately platform_device don't have a free method, and
 264          * we can't assume it's free of any reference at this point so we
 265          * can't free it either.
 266          */
 267         platform_device_unregister(sharpsl_pcmcia_device);
 268 }
 269
 270 fs_initcall(sharpsl_pcmcia_init);
 271 module_exit(sharpsl_pcmcia_exit);
 272
 273 MODULE_DESCRIPTION("Sharp SL Series PCMCIA Support");
 274 MODULE_LICENSE("GPL");