LXR linux/drivers/pcmcia/pxa2xx

   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
  29static 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
  48static unsigned long balloon3_pcmcia_status[2] = {
  49        BALLOON3_CF_nSTSCHG_BVD1,
  50        BALLOON3_CF_nSTSCHG_BVD1
  51};
  52
  53static 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
  83static 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
  92static 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
 101static struct platform_device *balloon3_pcmcia_device;
 102
 103static 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
 126static void __exit balloon3_pcmcia_exit(void)
 127{
 128        platform_device_unregister(balloon3_pcmcia_device);
 129}
 130
 131module_init(balloon3_pcmcia_init);
 132module_exit(balloon3_pcmcia_exit);
 133
 134MODULE_LICENSE("GPL");
 135MODULE_AUTHOR("Nick Bane <nick@cecomputing.co.uk>");
 136MODULE_ALIAS("platform:pxa2xx-pcmcia");
 137MODULE_DESCRIPTION("Balloon3 board CF/PCMCIA driver");
 138