LXR linux/arch/powerpc/platforms/512x/pdm360ng.c

   1/*
   2 * Copyright (C) 2010 DENX Software Engineering
   3 *
   4 * Anatolij Gustschin, <agust@denx.de>
   5 *
   6 * PDM360NG board setup
   7 *
   8 * This is free software; you can redistribute it and/or modify it
   9 * under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/io.h>
  17#include <linux/of_platform.h>
  18
  19#include <asm/machdep.h>
  20#include <asm/ipic.h>
  21
  22#include "mpc512x.h"
  23
  24#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
  25    defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
  26#include <linux/interrupt.h>
  27#include <linux/spi/ads7846.h>
  28#include <linux/spi/spi.h>
  29#include <linux/notifier.h>
  30
  31static void *pdm360ng_gpio_base;
  32
  33static int pdm360ng_get_pendown_state(void)
  34{
  35        u32 reg;
  36
  37        reg = in_be32(pdm360ng_gpio_base + 0xc);
  38        if (reg & 0x40)
  39                setbits32(pdm360ng_gpio_base + 0xc, 0x40);
  40
  41        reg = in_be32(pdm360ng_gpio_base + 0x8);
  42
  43        /* return 1 if pen is down */
  44        return (reg & 0x40) == 0;
  45}
  46
  47static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
  48        .model                  = 7845,
  49        .get_pendown_state      = pdm360ng_get_pendown_state,
  50        .irq_flags              = IRQF_TRIGGER_LOW,
  51};
  52
  53static int __init pdm360ng_penirq_init(void)
  54{
  55        struct device_node *np;
  56
  57        np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
  58        if (!np) {
  59                pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
  60                return -ENODEV;
  61        }
  62
  63        pdm360ng_gpio_base = of_iomap(np, 0);
  64        of_node_put(np);
  65        if (!pdm360ng_gpio_base) {
  66                pr_err("%s: Can't map gpio regs.\n", __func__);
  67                return -ENODEV;
  68        }
  69        out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
  70        setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
  71        setbits32(pdm360ng_gpio_base + 0x10, 0x40);
  72
  73        return 0;
  74}
  75
  76static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
  77                                        unsigned long event, void *__dev)
  78{
  79        struct device *dev = __dev;
  80
  81        if ((event == BUS_NOTIFY_ADD_DEVICE) &&
  82            of_device_is_compatible(dev->of_node, "ti,ads7846")) {
  83                dev->platform_data = &pdm360ng_ads7846_pdata;
  84                return NOTIFY_OK;
  85        }
  86        return NOTIFY_DONE;
  87}
  88
  89static struct notifier_block pdm360ng_touchscreen_nb = {
  90        .notifier_call = pdm360ng_touchscreen_notifier_call,
  91};
  92
  93static void __init pdm360ng_touchscreen_init(void)
  94{
  95        if (pdm360ng_penirq_init())
  96                return;
  97
  98        bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
  99}
 100#else
 101static inline void __init pdm360ng_touchscreen_init(void)
 102{
 103}
 104#endif /* CONFIG_TOUCHSCREEN_ADS7846 */
 105
 106void __init pdm360ng_init(void)
 107{
 108        mpc512x_init();
 109        pdm360ng_touchscreen_init();
 110}
 111
 112static int __init pdm360ng_probe(void)
 113{
 114        unsigned long root = of_get_flat_dt_root();
 115
 116        return of_flat_dt_is_compatible(root, "ifm,pdm360ng");
 117}
 118
 119define_machine(pdm360ng) {
 120        .name                   = "PDM360NG",
 121        .probe                  = pdm360ng_probe,
 122        .setup_arch             = mpc512x_setup_arch,
 123        .init                   = pdm360ng_init,
 124        .init_early             = mpc512x_init_early,
 125        .init_IRQ               = mpc512x_init_IRQ,
 126        .get_irq                = ipic_get_irq,
 127        .calibrate_decr         = generic_calibrate_decr,
 128        .restart                = mpc512x_restart,
 129};
 130