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
  24 #include <asm/hardware/scoop.h>
  25 #include <asm/arch/corgi.h>
  26 #include <asm/arch/pxa-regs.h>
  27
  28 #include "soc_common.h"
  29
  30 #define NO_KEEP_VS 0x0001
  31
  32 static unsigned char keep_vs;
  33 static unsigned char keep_rd;
  34
  35 static struct pcmcia_irqs irqs[] = {
  36         { 0, CORGI_IRQ_GPIO_CF_CD, "PCMCIA0 CD"},
  37 };
  38
  39 static void sharpsl_pcmcia_init_reset(void)
  40 {
  41         reset_scoop(&corgiscoop_device.dev);
  42         keep_vs = NO_KEEP_VS;
  43         keep_rd = 0;
  44 }
  45
  46 static int sharpsl_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  47 {
  48         int ret;
  49
  50         /*
  51          * Setup default state of GPIO outputs
  52          * before we enable them as outputs.
  53          */
  54         GPSR(GPIO48_nPOE) =
  55                 GPIO_bit(GPIO48_nPOE) |
  56                 GPIO_bit(GPIO49_nPWE) |
  57                 GPIO_bit(GPIO50_nPIOR) |
  58                 GPIO_bit(GPIO51_nPIOW) |
  59                 GPIO_bit(GPIO52_nPCE_1) |
  60                 GPIO_bit(GPIO53_nPCE_2);
  61
  62         pxa_gpio_mode(GPIO48_nPOE_MD);
  63         pxa_gpio_mode(GPIO49_nPWE_MD);
  64         pxa_gpio_mode(GPIO50_nPIOR_MD);
  65         pxa_gpio_mode(GPIO51_nPIOW_MD);
  66         pxa_gpio_mode(GPIO52_nPCE_1_MD);
  67         pxa_gpio_mode(GPIO53_nPCE_2_MD);
  68         pxa_gpio_mode(GPIO54_pSKTSEL_MD);
  69         pxa_gpio_mode(GPIO55_nPREG_MD);
  70         pxa_gpio_mode(GPIO56_nPWAIT_MD);
  71         pxa_gpio_mode(GPIO57_nIOIS16_MD);
  72
  73         /* Register interrupts */
  74         ret = soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  75
  76         if (ret) {
  77                 printk(KERN_ERR "Request for Compact Flash IRQ failed\n");
  78                 return ret;
  79         }
  80
  81         /* Enable interrupt */
  82         write_scoop_reg(&corgiscoop_device.dev, SCOOP_IMR, 0x00C0);
  83         write_scoop_reg(&corgiscoop_device.dev, SCOOP_MCR, 0x0101);
  84         keep_vs = NO_KEEP_VS;
  85
  86         skt->irq = CORGI_IRQ_GPIO_CF_IRQ;
  87
  88         return 0;
  89 }
  90
  91 static void sharpsl_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  92 {
  93         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  94
  95         /* CF_BUS_OFF */
  96         sharpsl_pcmcia_init_reset();
  97 }
  98
  99
 100 static void sharpsl_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
 101                                     struct pcmcia_state *state)
 102 {
 103         unsigned short cpr, csr;
 104
 105         cpr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_CPR);
 106
 107         write_scoop_reg(&corgiscoop_device.dev, SCOOP_IRM, 0x00FF);
 108         write_scoop_reg(&corgiscoop_device.dev, SCOOP_ISR, 0x0000);
 109         write_scoop_reg(&corgiscoop_device.dev, SCOOP_IRM, 0x0000);
 110         csr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_CSR);
 111         if (csr & 0x0004) {
 112                 /* card eject */
 113                 write_scoop_reg(&corgiscoop_device.dev, SCOOP_CDR, 0x0000);
 114                 keep_vs = NO_KEEP_VS;
 115         }
 116         else if (!(keep_vs & NO_KEEP_VS)) {
 117                 /* keep vs1,vs2 */
 118                 write_scoop_reg(&corgiscoop_device.dev, SCOOP_CDR, 0x0000);
 119                 csr |= keep_vs;
 120         }
 121         else if (cpr & 0x0003) {
 122                 /* power on */
 123                 write_scoop_reg(&corgiscoop_device.dev, SCOOP_CDR, 0x0000);
 124                 keep_vs = (csr & 0x00C0);
 125         }
 126         else {
 127                 /* card detect */
 128                 write_scoop_reg(&corgiscoop_device.dev, SCOOP_CDR, 0x0002);
 129         }
 130
 131         state->detect = (csr & 0x0004) ? 0 : 1;
 132         state->ready  = (csr & 0x0002) ? 1 : 0;
 133         state->bvd1   = (csr & 0x0010) ? 1 : 0;
 134         state->bvd2   = (csr & 0x0020) ? 1 : 0;
 135         state->wrprot = (csr & 0x0008) ? 1 : 0;
 136         state->vs_3v  = (csr & 0x0040) ? 0 : 1;
 137         state->vs_Xv  = (csr & 0x0080) ? 0 : 1;
 138
 139         if ((cpr & 0x0080) && ((cpr & 0x8040) != 0x8040)) {
 140                 printk(KERN_ERR "sharpsl_pcmcia_socket_state(): CPR=%04X, Low voltage!\n", cpr);
 141         }
 142
 143 }
 144
 145
 146 static int sharpsl_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
 147                                        const socket_state_t *state)
 148 {
 149         unsigned long flags;
 150
 151         unsigned short cpr, ncpr, ccr, nccr, mcr, nmcr, imr, nimr;
 152
 153         switch (state->Vcc) {
 154         case    0:      break;
 155         case    33:     break;
 156         case    50:     break;
 157         default:
 158                  printk(KERN_ERR "sharpsl_pcmcia_configure_socket(): bad Vcc %u\n", state->Vcc);
 159                  return -1;
 160         }
 161
 162         if ((state->Vpp!=state->Vcc) && (state->Vpp!=0)) {
 163                 printk(KERN_ERR "CF slot cannot support Vpp %u\n", state->Vpp);
 164                 return -1;
 165         }
 166
 167         local_irq_save(flags);
 168
 169         nmcr = (mcr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_MCR)) & ~0x0010;
 170         ncpr = (cpr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_CPR)) & ~0x0083;
 171         nccr = (ccr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_CCR)) & ~0x0080;
 172         nimr = (imr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_IMR)) & ~0x003E;
 173
 174         ncpr |= (state->Vcc == 33) ? 0x0001 :
 175                                 (state->Vcc == 50) ? 0x0002 : 0;
 176         nmcr |= (state->flags&SS_IOCARD) ? 0x0010 : 0;
 177         ncpr |= (state->flags&SS_OUTPUT_ENA) ? 0x0080 : 0;
 178         nccr |= (state->flags&SS_RESET)? 0x0080: 0;
 179         nimr |= ((skt->status&SS_DETECT) ? 0x0004 : 0)|
 180                         ((skt->status&SS_READY)  ? 0x0002 : 0)|
 181                         ((skt->status&SS_BATDEAD)? 0x0010 : 0)|
 182                         ((skt->status&SS_BATWARN)? 0x0020 : 0)|
 183                         ((skt->status&SS_STSCHG) ? 0x0010 : 0)|
 184                         ((skt->status&SS_WRPROT) ? 0x0008 : 0);
 185
 186         if (!(ncpr & 0x0003)) {
 187                 keep_rd = 0;
 188         } else if (!keep_rd) {
 189                 if (nccr & 0x0080)
 190                         keep_rd = 1;
 191                 else
 192                         nccr |= 0x0080;
 193         }
 194
 195         if (mcr != nmcr)
 196                 write_scoop_reg(&corgiscoop_device.dev, SCOOP_MCR, nmcr);
 197         if (cpr != ncpr)
 198                 write_scoop_reg(&corgiscoop_device.dev, SCOOP_CPR, ncpr);
 199         if (ccr != nccr)
 200                 write_scoop_reg(&corgiscoop_device.dev, SCOOP_CCR, nccr);
 201         if (imr != nimr)
 202                 write_scoop_reg(&corgiscoop_device.dev, SCOOP_IMR, nimr);
 203
 204         local_irq_restore(flags);
 205
 206         return 0;
 207 }
 208
 209 static void sharpsl_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 210 {
 211 }
 212
 213 static void sharpsl_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 214 {
 215 }
 216
 217 static struct pcmcia_low_level sharpsl_pcmcia_ops = {
 218         .owner                          = THIS_MODULE,
 219         .hw_init                        = sharpsl_pcmcia_hw_init,
 220         .hw_shutdown            = sharpsl_pcmcia_hw_shutdown,
 221         .socket_state           = sharpsl_pcmcia_socket_state,
 222         .configure_socket       = sharpsl_pcmcia_configure_socket,
 223         .socket_init            = sharpsl_pcmcia_socket_init,
 224         .socket_suspend         = sharpsl_pcmcia_socket_suspend,
 225         .first                          = 0,
 226         .nr                                     = 1,
 227 };
 228
 229 static struct platform_device *sharpsl_pcmcia_device;
 230
 231 static int __init sharpsl_pcmcia_init(void)
 232 {
 233         int ret;
 234
 235         sharpsl_pcmcia_device = kmalloc(sizeof(*sharpsl_pcmcia_device), GFP_KERNEL);
 236         if (!sharpsl_pcmcia_device)
 237                 return -ENOMEM;
 238         memset(sharpsl_pcmcia_device, 0, sizeof(*sharpsl_pcmcia_device));
 239         sharpsl_pcmcia_device->name = "pxa2xx-pcmcia";
 240         sharpsl_pcmcia_device->dev.platform_data = &sharpsl_pcmcia_ops;
 241
 242         ret = platform_device_register(sharpsl_pcmcia_device);
 243         if (ret)
 244                 kfree(sharpsl_pcmcia_device);
 245
 246         return ret;
 247 }
 248
 249 static void __exit sharpsl_pcmcia_exit(void)
 250 {
 251         /*
 252          * This call is supposed to free our sharpsl_pcmcia_device.
 253          * Unfortunately platform_device don't have a free method, and
 254          * we can't assume it's free of any reference at this point so we
 255          * can't free it either.
 256          */
 257         platform_device_unregister(sharpsl_pcmcia_device);
 258 }
 259
 260 module_init(sharpsl_pcmcia_init);
 261 module_exit(sharpsl_pcmcia_exit);
 262
 263 MODULE_DESCRIPTION("Sharp SL Series PCMCIA Support");
 264 MODULE_LICENSE("GPL");