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
  33 static void *pdm360ng_gpio_base;
  34
  35 static 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
  49 static 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
  55 static 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
  78 static 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
  91 static struct notifier_block pdm360ng_touchscreen_nb = {
  92         .notifier_call = pdm360ng_touchscreen_notifier_call,
  93 };
  94
  95 static 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
 103 static inline void __init pdm360ng_touchscreen_init(void)
 104 {
 105 }
 106 #endif /* CONFIG_TOUCHSCREEN_ADS7846 */
 107
 108 void __init pdm360ng_init(void)
 109 {
 110         mpc512x_init();
 111         pdm360ng_touchscreen_init();
 112 }
 113
 114 static 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
 121 define_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 };