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_address.h>
  18#include <linux/of_fdt.h>
  19#include <linux/of_platform.h>
  20
  21#include <asm/machdep.h>
  22#include <asm/ipic.h>
  23
  24#include "mpc512x.h"
  25
  26#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
  27    defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
  28#include <linux/interrupt.h>
  29#include <linux/spi/ads7846.h>
  30#include <linux/spi/spi.h>
  31#include <linux/notifier.h>
  32
  33static void *pdm360ng_gpio_base;
  34
  35static int pdm360ng_get_pendown_state(void)
  36{
  37        u32 reg;
  38
  39        reg = in_be32(pdm360ng_gpio_base + 0xc);
  40        if (reg & 0x40)
  41                setbits32(pdm360ng_gpio_base + 0xc, 0x40);
  42
  43        reg = in_be32(pdm360ng_gpio_base + 0x8);
  44
  45        /* return 1 if pen is down */
  46        return (reg & 0x40) == 0;
  47}
  48
  49static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
  50        .model                  = 7845,
  51        .get_pendown_state      = pdm360ng_get_pendown_state,
  52        .irq_flags              = IRQF_TRIGGER_LOW,
  53};
  54
  55static int __init pdm360ng_penirq_init(void)
  56{
  57        struct device_node *np;
  58
  59        np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
  60        if (!np) {
  61                pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
  62                return -ENODEV;
  63        }
  64
  65        pdm360ng_gpio_base = of_iomap(np, 0);
  66        of_node_put(np);
  67        if (!pdm360ng_gpio_base) {
  68                pr_err("%s: Can't map gpio regs.\n", __func__);
  69                return -ENODEV;
  70        }
  71        out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
  72        setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
  73        setbits32(pdm360ng_gpio_base + 0x10, 0x40);
  74
  75        return 0;
  76}
  77
  78static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
  79                                        unsigned long event, void *__dev)
  80{
  81        struct device *dev = __dev;
  82
  83        if ((event == BUS_NOTIFY_ADD_DEVICE) &&
  84            of_device_is_compatible(dev->of_node, "ti,ads7846")) {
  85                dev->platform_data = &pdm360ng_ads7846_pdata;
  86                return NOTIFY_OK;
  87        }
  88        return NOTIFY_DONE;
  89}
  90
  91static struct notifier_block pdm360ng_touchscreen_nb = {
  92        .notifier_call = pdm360ng_touchscreen_notifier_call,
  93};
  94
  95static void __init pdm360ng_touchscreen_init(void)
  96{
  97        if (pdm360ng_penirq_init())
  98                return;
  99
 100        bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
 101}
 102#else
 103static inline void __init pdm360ng_touchscreen_init(void)
 104{
 105}
 106#endif /* CONFIG_TOUCHSCREEN_ADS7846 */
 107
 108void __init pdm360ng_init(void)
 109{
 110        mpc512x_init();
 111        pdm360ng_touchscreen_init();
 112}
 113
 114static int __init pdm360ng_probe(void)
 115{
 116        unsigned long root = of_get_flat_dt_root();
 117
 118        return of_flat_dt_is_compatible(root, "ifm,pdm360ng");
 119}
 120
 121define_machine(pdm360ng) {
 122        .name                   = "PDM360NG",
 123        .probe                  = pdm360ng_probe,
 124        .setup_arch             = mpc512x_setup_arch,
 125        .init                   = pdm360ng_init,
 126        .init_early             = mpc512x_init_early,
 127        .init_IRQ               = mpc512x_init_IRQ,
 128        .get_irq                = ipic_get_irq,
 129        .calibrate_decr         = generic_calibrate_decr,
 130        .restart                = mpc512x_restart,
 131};
 132