drivers/pcmcia/pxa2xx_balloon3.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/drivers/pcmcia/pxa2xx_balloon3.c
   4  *
   5  * Balloon3 PCMCIA specific routines.
   6  *
   7  *  Author:     Nick Bane
   8  *  Created:    June, 2006
   9  *  Copyright:  Toby Churchill Ltd
  10  *  Derived from pxa2xx_mainstone.c, by Nico Pitre
  11  *
  12  * Various modification by Marek Vasut <marek.vasut@gmail.com>
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/gpio.h>
  17 #include <linux/errno.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/irq.h>
  21 #include <linux/io.h>
  22
  23 #include <mach/balloon3.h>
  24
  25 #include <asm/mach-types.h>
  26
  27 #include "soc_common.h"
  28
  29 static int balloon3_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  30 {
  31         uint16_t ver;
  32
  33         ver = __raw_readw(BALLOON3_FPGA_VER);
  34         if (ver < 0x4f08)
  35                 pr_warn("The FPGA code, version 0x%04x, is too old. "
  36                         "PCMCIA/CF support might be broken in this version!",
  37                         ver);
  38
  39         skt->socket.pci_irq = BALLOON3_BP_CF_NRDY_IRQ;
  40         skt->stat[SOC_STAT_CD].gpio = BALLOON3_GPIO_S0_CD;
  41         skt->stat[SOC_STAT_CD].name = "PCMCIA0 CD";
  42         skt->stat[SOC_STAT_BVD1].irq = BALLOON3_BP_NSTSCHG_IRQ;
  43         skt->stat[SOC_STAT_BVD1].name = "PCMCIA0 STSCHG";
  44
  45         return 0;
  46 }
  47
  48 static unsigned long balloon3_pcmcia_status[2] = {
  49         BALLOON3_CF_nSTSCHG_BVD1,
  50         BALLOON3_CF_nSTSCHG_BVD1
  51 };
  52
  53 static void balloon3_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  54                                     struct pcmcia_state *state)
  55 {
  56         uint16_t status;
  57         int flip;
  58
  59         /* This actually reads the STATUS register */
  60         status = __raw_readw(BALLOON3_CF_STATUS_REG);
  61         flip = (status ^ balloon3_pcmcia_status[skt->nr])
  62                 & BALLOON3_CF_nSTSCHG_BVD1;
  63         /*
  64          * Workaround for STSCHG which can't be deasserted:
  65          * We therefore disable/enable corresponding IRQs
  66          * as needed to avoid IRQ locks.
  67          */
  68         if (flip) {
  69                 balloon3_pcmcia_status[skt->nr] = status;
  70                 if (status & BALLOON3_CF_nSTSCHG_BVD1)
  71                         enable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  72                 else
  73                         disable_irq(BALLOON3_BP_NSTSCHG_IRQ);
  74         }
  75
  76         state->ready    = !!(status & BALLOON3_CF_nIRQ);
  77         state->bvd1     = !!(status & BALLOON3_CF_nSTSCHG_BVD1);
  78         state->bvd2     = 0;    /* not available */
  79         state->vs_3v    = 1;    /* Always true its a CF card */
  80         state->vs_Xv    = 0;    /* not available */
  81 }
  82
  83 static int balloon3_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  84                                        const socket_state_t *state)
  85 {
  86         __raw_writew(BALLOON3_CF_RESET, BALLOON3_CF_CONTROL_REG +
  87                         ((state->flags & SS_RESET) ?
  88                         BALLOON3_FPGA_SETnCLR : 0));
  89         return 0;
  90 }
  91
  92 static struct pcmcia_low_level balloon3_pcmcia_ops = {
  93         .owner                  = THIS_MODULE,
  94         .hw_init                = balloon3_pcmcia_hw_init,
  95         .socket_state           = balloon3_pcmcia_socket_state,
  96         .configure_socket       = balloon3_pcmcia_configure_socket,
  97         .first                  = 0,
  98         .nr                     = 1,
  99 };
 100
 101 static struct platform_device *balloon3_pcmcia_device;
 102
 103 static int __init balloon3_pcmcia_init(void)
 104 {
 105         int ret;
 106
 107         if (!machine_is_balloon3())
 108                 return -ENODEV;
 109
 110         balloon3_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
 111         if (!balloon3_pcmcia_device)
 112                 return -ENOMEM;
 113
 114         ret = platform_device_add_data(balloon3_pcmcia_device,
 115                         &balloon3_pcmcia_ops, sizeof(balloon3_pcmcia_ops));
 116
 117         if (!ret)
 118                 ret = platform_device_add(balloon3_pcmcia_device);
 119
 120         if (ret)
 121                 platform_device_put(balloon3_pcmcia_device);
 122
 123         return ret;
 124 }
 125
 126 static void __exit balloon3_pcmcia_exit(void)
 127 {
 128         platform_device_unregister(balloon3_pcmcia_device);
 129 }
 130
 131 module_init(balloon3_pcmcia_init);
 132 module_exit(balloon3_pcmcia_exit);
 133
 134 MODULE_LICENSE("GPL");
 135 MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
 136 MODULE_ALIAS("platform:pxa2xx-pcmcia");
 137 MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");