LXR linux/drivers/pcmcia/pxa2xx

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * linux/drivers/pcmcia/pxa2xx_mainstone.c
   4 *
   5 * Mainstone PCMCIA specific routines.
   6 *
   7 * Created:     May 12, 2004
   8 * Author:      Nicolas Pitre
   9 * Copyright:   MontaVista Software Inc.
  10 */
  11#include <linux/gpio/consumer.h>
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/interrupt.h>
  15#include <linux/kernel.h>
  16#include <linux/errno.h>
  17#include <linux/platform_device.h>
  18
  19#include <pcmcia/ss.h>
  20
  21#include <asm/mach-types.h>
  22
  23#include "soc_common.h"
  24#include "max1600.h"
  25
  26static int mst_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
  27{
  28        struct device *dev = skt->socket.dev.parent;
  29        struct max1600 *m;
  30        int ret;
  31
  32        skt->stat[SOC_STAT_CD].name = skt->nr ? "bdetect" : "adetect";
  33        skt->stat[SOC_STAT_BVD1].name = skt->nr ? "bbvd1" : "abvd1";
  34        skt->stat[SOC_STAT_BVD2].name = skt->nr ? "bbvd2" : "abvd2";
  35        skt->stat[SOC_STAT_RDY].name = skt->nr ? "bready" : "aready";
  36        skt->stat[SOC_STAT_VS1].name = skt->nr ? "bvs1" : "avs1";
  37        skt->stat[SOC_STAT_VS2].name = skt->nr ? "bvs2" : "avs2";
  38
  39        skt->gpio_reset = devm_gpiod_get(dev, skt->nr ? "breset" : "areset",
  40                                         GPIOD_OUT_HIGH);
  41        if (IS_ERR(skt->gpio_reset))
  42                return PTR_ERR(skt->gpio_reset);
  43
  44        ret = max1600_init(dev, &m, skt->nr ? MAX1600_CHAN_B : MAX1600_CHAN_A,
  45                           MAX1600_CODE_HIGH);
  46        if (ret)
  47                return ret;
  48
  49        skt->driver_data = m;
  50
  51        return soc_pcmcia_request_gpiods(skt);
  52}
  53
  54static unsigned int mst_pcmcia_bvd1_status[2];
  55
  56static void mst_pcmcia_socket_state(struct soc_pcmcia_socket *skt,
  57                                    struct pcmcia_state *state)
  58{
  59        unsigned int flip = mst_pcmcia_bvd1_status[skt->nr] ^ state->bvd1;
  60
  61        /*
  62         * Workaround for STSCHG which can't be deasserted:
  63         * We therefore disable/enable corresponding IRQs
  64         * as needed to avoid IRQ locks.
  65         */
  66        if (flip) {
  67                mst_pcmcia_bvd1_status[skt->nr] = state->bvd1;
  68                if (state->bvd1)
  69                        enable_irq(skt->stat[SOC_STAT_BVD1].irq);
  70                else
  71                        disable_irq(skt->stat[SOC_STAT_BVD2].irq);
  72        }
  73}
  74
  75static int mst_pcmcia_configure_socket(struct soc_pcmcia_socket *skt,
  76                                       const socket_state_t *state)
  77{
  78        return max1600_configure(skt->driver_data, state->Vcc, state->Vpp);
  79}
  80
  81static struct pcmcia_low_level mst_pcmcia_ops __initdata = {
  82        .owner                  = THIS_MODULE,
  83        .hw_init                = mst_pcmcia_hw_init,
  84        .socket_state           = mst_pcmcia_socket_state,
  85        .configure_socket       = mst_pcmcia_configure_socket,
  86        .nr                     = 2,
  87};
  88
  89static struct platform_device *mst_pcmcia_device;
  90
  91static int __init mst_pcmcia_init(void)
  92{
  93        int ret;
  94
  95        if (!machine_is_mainstone())
  96                return -ENODEV;
  97
  98        mst_pcmcia_device = platform_device_alloc("pxa2xx-pcmcia", -1);
  99        if (!mst_pcmcia_device)
 100                return -ENOMEM;
 101
 102        ret = platform_device_add_data(mst_pcmcia_device, &mst_pcmcia_ops,
 103                                       sizeof(mst_pcmcia_ops));
 104        if (ret == 0)
 105                ret = platform_device_add(mst_pcmcia_device);
 106
 107        if (ret)
 108                platform_device_put(mst_pcmcia_device);
 109
 110        return ret;
 111}
 112
 113static void __exit mst_pcmcia_exit(void)
 114{
 115        platform_device_unregister(mst_pcmcia_device);
 116}
 117
 118fs_initcall(mst_pcmcia_init);
 119module_exit(mst_pcmcia_exit);
 120
 121MODULE_LICENSE("GPL");
 122MODULE_ALIAS("platform:pxa2xx-pcmcia");
 123