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 /*
  33  * These are a list of interrupt sources that provokes a polled
  34  * check of status
  35  */
  36 static struct pcmcia_irqs irqs[] = {
  37         { 0, BALLOON3_S0_CD_IRQ, "PCMCIA0 CD" },
  38         { 0, BALLOON3_BP_NSTSCHG_IRQ, "PCMCIA0 STSCHG" },
  39 };
  40
  41 static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  42 {
  43         uint16_t ver;
  44
  45         ver = __raw_readw(BALLOON3_FPGA_VER);
  46         if (ver < 0x4f08)
  47                 pr_warn("The FPGA code, version 0x%04x, is too old. "
  48                         "PCMCIA/CF support might be broken in this version!",
  49                         ver);
  50
  51         skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
  52         return soc_pcmcia_request_irqs(skt, irqs, ARRAY_SIZE(irqs));
  53 }
  54
  55 static void balloon3_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
  56 {
  57         soc_pcmcia_free_irqs(skt, irqs, ARRAY_SIZE(irqs));
  58 }
  59
  60 static unsigned long balloon3_pcmcia_status[2] = {
  61         BALLOON3_CF_nSTSCHG_BVD1,
  62         BALLOON3_CF_nSTSCHG_BVD1
  63 };
  64
  65 static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  66                                     struct pcmcia_state *state)
  67 {
  68         uint16_t status;
  69         int flip;
  70
  71         /* This actually reads the STATUS register */
  72         status = __raw_readw(BALLOON3_CF_STATUS_REG);
  73         flip = (status ^ balloon3_pcmcia_status[skt->nr])
  74                 & BALLOON3_CF_nSTSCHG_BVD1;
  75         /*
  76          * Workaround for STSCHG which can't be deasserted:
  77          * We therefore disable/enable corresponding IRQs
  78          * as needed to avoid IRQ locks.
  79          */
  80         if (flip) {
  81                 balloon3_pcmcia_status[skt->nr] = status;
  82                 if (status & BALLOON3_CF_nSTSCHG_BVD1)
  83                         enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  84                 else
  85                         disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  86         }
  87
  88         state->detect   = !gpio_get_value(BALLOON3_GPIO_S0_CD);
  89         state->ready    = !!(status & BALLOON3_CF_nIRQ);
  90         state->bvd1     = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
  91         state->bvd2     = 0;    /* not available */
  92         state->vs_3v    = 1;    /* Always true its a CF card */
  93         state->vs_Xv    = 0;    /* not available */
  94         state->wrprot   = 0;    /* not available */
  95 }
  96
  97 static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  98                                        const socket_state_t *state)
  99 {
 100         __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +
 101                         ((state->flags & SS_RESET) ?
 102                         BALLOON3_FPGA_SETnCLR : 0));
 103         return 0;
 104 }
 105
 106 static struct pcmcia_low_level balloon3_pcmcia_ops = {
 107         .owner                  = THIS_MODULE,
 108         .hw_init                = balloon3_pcmcia_hw_init,
 109         .hw_shutdown            = balloon3_pcmcia_hw_shutdown,
 110         .socket_state           = balloon3_pcmcia_socket_state,
 111         .configure_socket       = balloon3_pcmcia_configure_socket,
 112         .first                  = 0,
 113         .nr                     = 1,
 114 };
 115
 116 static struct platform_device *balloon3_pcmcia_device;
 117
 118 static int __init balloon3_pcmcia_init(void)
 119 {
 120         int ret;
 121
 122         if (!machine_is_balloon3())
 123                 return -ENODEV;
 124
 125         balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 126         if (!balloon3_pcmcia_device)
 127                 return -ENOMEM;
 128
 129         ret = platform_device_add_data(balloon3_pcmcia_device,
 130                         &balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
 131
 132         if (!ret)
 133                 ret = platform_device_add(balloon3_pcmcia_device);
 134
 135         if (ret)
 136                 platform_device_put(balloon3_pcmcia_device);
 137
 138         return ret;
 139 }
 140
 141 static void __exit balloon3_pcmcia_exit(void)
 142 {
 143         platform_device_unregister(balloon3_pcmcia_device);
 144 }
 145
 146 module_init(balloon3_pcmcia_init);
 147 module_exit(balloon3_pcmcia_exit);
 148
 149 MODULE_LICENSE("GPL");
 150 MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
 151 MODULE_ALIAS("platform:pxa2xx-pcmcia");
 152 MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");