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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright (C) 2010 DENX Software Engineering
   4 *
   5 * Anatolij Gustschin, <agust@denx.de>
   6 *
   7 * PDM360NG board setup
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/io.h>
  12#include <linux/of_address.h>
  13#include <linux/of_fdt.h>
  14#include <linux/of_platform.h>
  15
  16#include <asm/machdep.h>
  17#include <asm/ipic.h>
  18
  19#include "mpc512x.h"
  20
  21#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
  22    defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
  23#include <linux/interrupt.h>
  24#include <linux/spi/ads7846.h>
  25#include <linux/spi/spi.h>
  26#include <linux/notifier.h>
  27
  28static void *pdm360ng_gpio_base;
  29
  30static int pdm360ng_get_pendown_state(void)
  31{
  32        u32 reg;
  33
  34        reg = in_be32(pdm360ng_gpio_base + 0xc);
  35        if (reg & 0x40)
  36                setbits32(pdm360ng_gpio_base + 0xc, 0x40);
  37
  38        reg = in_be32(pdm360ng_gpio_base + 0x8);
  39
  40        /* return 1 if pen is down */
  41        return (reg & 0x40) == 0;
  42}
  43
  44static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
  45        .model                  = 7845,
  46        .get_pendown_state      = pdm360ng_get_pendown_state,
  47        .irq_flags              = IRQF_TRIGGER_LOW,
  48};
  49
  50static int __init pdm360ng_penirq_init(void)
  51{
  52        struct device_node *np;
  53
  54        np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
  55        if (!np) {
  56                pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
  57                return -ENODEV;
  58        }
  59
  60        pdm360ng_gpio_base = of_iomap(np, 0);
  61        of_node_put(np);
  62        if (!pdm360ng_gpio_base) {
  63                pr_err("%s: Can't map gpio regs.\n", __func__);
  64                return -ENODEV;
  65        }
  66        out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
  67        setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
  68        setbits32(pdm360ng_gpio_base + 0x10, 0x40);
  69
  70        return 0;
  71}
  72
  73static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
  74                                        unsigned long event, void *__dev)
  75{
  76        struct device *dev = __dev;
  77
  78        if ((event == BUS_NOTIFY_ADD_DEVICE) &&
  79            of_device_is_compatible(dev->of_node, "ti,ads7846")) {
  80                dev->platform_data = &pdm360ng_ads7846_pdata;
  81                return NOTIFY_OK;
  82        }
  83        return NOTIFY_DONE;
  84}
  85
  86static struct notifier_block pdm360ng_touchscreen_nb = {
  87        .notifier_call = pdm360ng_touchscreen_notifier_call,
  88};
  89
  90static void __init pdm360ng_touchscreen_init(void)
  91{
  92        if (pdm360ng_penirq_init())
  93                return;
  94
  95        bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
  96}
  97#else
  98static inline void __init pdm360ng_touchscreen_init(void)
  99{
 100}
 101#endif /* CONFIG_TOUCHSCREEN_ADS7846 */
 102
 103void __init pdm360ng_init(void)
 104{
 105        mpc512x_init();
 106        pdm360ng_touchscreen_init();
 107}
 108
 109static int __init pdm360ng_probe(void)
 110{
 111        if (!of_machine_is_compatible("ifm,pdm360ng"))
 112                return 0;
 113
 114        mpc512x_init_early();
 115
 116        return 1;
 117}
 118
 119define_machine(pdm360ng) {
 120        .name                   = "PDM360NG",
 121        .probe                  = pdm360ng_probe,
 122        .setup_arch             = mpc512x_setup_arch,
 123        .init                   = pdm360ng_init,
 124        .init_IRQ               = mpc512x_init_IRQ,
 125        .get_irq                = ipic_get_irq,
 126        .calibrate_decr         = generic_calibrate_decr,
 127        .restart                = mpc512x_restart,
 128};
 129