drivers/pcmcia/pxa2xx_balloon3.c

   1 /*
   2  * linux/drivers/pcmcia/pxa2xx_balloon3.c
   3  *
   4  * Balloon3 PCMCIA specific routines.
   5  *
   6  *  Author:     Nick Bane
   7  *  Created:    June, 2006
   8  *  Copyright:  Toby Churchill Ltd
   9  *  Derived from pxa2xx_mainstone.c, by Nico Pitre
  10  *
  11  * Various modification by Marek Vasut <marek.vasut@gmail.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/gpio.h>
  20 #include <linux/errno.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/irq.h>
  24 #include <linux/io.h>
  25
  26 #include <mach/balloon3.h>
  27
  28 #include "soc_common.h"
  29
  30 /*
  31  * These are a list of interrupt sources that provokes a polled
  32  * check of status
  33  */
  34 static struct pcmcia_irqs irqs[] = {
  35         { 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
  36         { 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
  37 };
  38
  39 static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  40 {
  41         uint16_t ver;
  42
  43         ver = __raw_readw(BALLOON3_FPGA_VER);
  44         if (ver < 0x4f08)
  45                 pr_warn("The FPGA code, version 0x%04x, is too old. "
  46                         "PCMCIA/CF support might be broken in this version!",
  47                         ver);
  48
  49         skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
  50         return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  51 }
  52
  53 static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  54 {
  55         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  56 }
  57
  58 static unsigned long balloon3_pcmcia_status[2] = {
  59         BALLOON3_CF_nSTSCHG_BVD1,
  60         BALLOON3_CF_nSTSCHG_BVD1
  61 };
  62
  63 static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  64                                     struct pcmcia_state *state)
  65 {
  66         uint16_t status;
  67         int flip;
  68
  69         /* This actually reads the STATUS register */
  70         status = __raw_readw(BALLOON3_CF_STATUS_REG);
  71         flip = (status ^ balloon3_pcmcia_status[skt->nr])
  72                 & BALLOON3_CF_nSTSCHG_BVD1;
  73         /*
  74          * Workaround for STSCHG which can't be deasserted:
  75          * We therefore disable/enable corresponding IRQs
  76          * as needed to avoid IRQ locks.
  77          */
  78         if (flip) {
  79                 balloon3_pcmcia_status[skt->nr] = status;
  80                 if (status & BALLOON3_CF_nSTSCHG_BVD1)
  81                         enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  82                 else
  83                         disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  84         }
  85
  86         state->detect   = !gpio_get_value(BALLOON3_GPIO_S0_CD);
  87         state->ready    = !!(status & BALLOON3_CF_nIRQ);
  88         state->bvd1     = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
  89         state->bvd2     = 0;    /* not available */
  90         state->vs_3v    = 1;    /* Always true its a CF card */
  91         state->vs_Xv    = 0;    /* not available */
  92         state->wrprot   = 0;    /* not available */
  93 }
  94
  95 static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  96                                        const socket_state_t *state)
  97 {
  98         __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG |
  99                         ((state->flags & SS_RESET) ?
 100                         BALLOON3_FPGA_SETnCLR : 0));
 101         return 0;
 102 }
 103
 104 static void balloon3_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
 105 {
 106 }
 107
 108 static void balloon3_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
 109 {
 110 }
 111
 112 static struct pcmcia_low_level balloon3_pcmcia_ops = {
 113         .owner                  = THIS_MODULE,
 114         .hw_init                = balloon3_pcmcia_hw_init,
 115         .hw_shutdown            = balloon3_pcmcia_hw_shutdown,
 116         .socket_state           = balloon3_pcmcia_socket_state,
 117         .configure_socket       = balloon3_pcmcia_configure_socket,
 118         .socket_init            = balloon3_pcmcia_socket_init,
 119         .socket_suspend         = balloon3_pcmcia_socket_suspend,
 120         .first                  = 0,
 121         .nr                     = 1,
 122 };
 123
 124 static struct platform_device *balloon3_pcmcia_device;
 125
 126 static int __init balloon3_pcmcia_init(void)
 127 {
 128         int ret;
 129
 130         balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 131         if (!balloon3_pcmcia_device)
 132                 return -ENOMEM;
 133
 134         ret = platform_device_add_data(balloon3_pcmcia_device,
 135                         &balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
 136
 137         if (!ret)
 138                 ret = platform_device_add(balloon3_pcmcia_device);
 139
 140         if (ret)
 141                 platform_device_put(balloon3_pcmcia_device);
 142
 143         return ret;
 144 }
 145
 146 static void __exit balloon3_pcmcia_exit(void)
 147 {
 148         platform_device_unregister(balloon3_pcmcia_device);
 149 }
 150
 151 module_init(balloon3_pcmcia_init);
 152 module_exit(balloon3_pcmcia_exit);
 153
 154 MODULE_LICENSE("GPL");
 155 MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
 156 MODULE_ALIAS("platform:pxa2xx-pcmcia");
 157 MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");