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 <asm/mach-types.h>
  29
  30 #include "soc_common.h"
  31
  32 static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  33 {
  34         uint16_t ver;
  35
  36         ver = __raw_readw(BALLOON3_FPGA_VER);
  37         if (ver < 0x4f08)
  38                 pr_warn("The FPGA code, version 0x%04x, is too old. "
  39                         "PCMCIA/CF support might be broken in this version!",
  40                         ver);
  41
  42         skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
  43         skt->stat[SOC_STAT_CD].gpio = BALLOON3_GPIO_S0_CD;
  44         skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
  45         skt->stat[SOC_STAT_BVD1].irq = BALLOON3_BP_NSTSCHG_IRQ;
  46         skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";
  47
  48         return 0;
  49 }
  50
  51 static unsigned long balloon3_pcmcia_status[2] = {
  52         BALLOON3_CF_nSTSCHG_BVD1,
  53         BALLOON3_CF_nSTSCHG_BVD1
  54 };
  55
  56 static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  57                                     struct pcmcia_state *state)
  58 {
  59         uint16_t status;
  60         int flip;
  61
  62         /* This actually reads the STATUS register */
  63         status = __raw_readw(BALLOON3_CF_STATUS_REG);
  64         flip = (status ^ balloon3_pcmcia_status[skt->nr])
  65                 & BALLOON3_CF_nSTSCHG_BVD1;
  66         /*
  67          * Workaround for STSCHG which can't be deasserted:
  68          * We therefore disable/enable corresponding IRQs
  69          * as needed to avoid IRQ locks.
  70          */
  71         if (flip) {
  72                 balloon3_pcmcia_status[skt->nr] = status;
  73                 if (status & BALLOON3_CF_nSTSCHG_BVD1)
  74                         enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  75                 else
  76                         disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  77         }
  78
  79         state->ready    = !!(status & BALLOON3_CF_nIRQ);
  80         state->bvd1     = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
  81         state->bvd2     = 0;    /* not available */
  82         state->vs_3v    = 1;    /* Always true its a CF card */
  83         state->vs_Xv    = 0;    /* not available */
  84 }
  85
  86 static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  87                                        const socket_state_t *state)
  88 {
  89         __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +
  90                         ((state->flags & SS_RESET) ?
  91                         BALLOON3_FPGA_SETnCLR : 0));
  92         return 0;
  93 }
  94
  95 static struct pcmcia_low_level balloon3_pcmcia_ops = {
  96         .owner                  = THIS_MODULE,
  97         .hw_init                = balloon3_pcmcia_hw_init,
  98         .socket_state           = balloon3_pcmcia_socket_state,
  99         .configure_socket       = balloon3_pcmcia_configure_socket,
 100         .first                  = 0,
 101         .nr                     = 1,
 102 };
 103
 104 static struct platform_device *balloon3_pcmcia_device;
 105
 106 static int __init balloon3_pcmcia_init(void)
 107 {
 108         int ret;
 109
 110         if (!machine_is_balloon3())
 111                 return -ENODEV;
 112
 113         balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 114         if (!balloon3_pcmcia_device)
 115                 return -ENOMEM;
 116
 117         ret = platform_device_add_data(balloon3_pcmcia_device,
 118                         &balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
 119
 120         if (!ret)
 121                 ret = platform_device_add(balloon3_pcmcia_device);
 122
 123         if (ret)
 124                 platform_device_put(balloon3_pcmcia_device);
 125
 126         return ret;
 127 }
 128
 129 static void __exit balloon3_pcmcia_exit(void)
 130 {
 131         platform_device_unregister(balloon3_pcmcia_device);
 132 }
 133
 134 module_init(balloon3_pcmcia_init);
 135 module_exit(balloon3_pcmcia_exit);
 136
 137 MODULE_LICENSE("GPL");
 138 MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
 139 MODULE_ALIAS("platform:pxa2xx-pcmcia");
 140 MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");