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
  31 static void *pdm360ng_gpio_base;
  32
  33 static 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
  47 static 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
  53 static 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
  76 static 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
  89 static struct notifier_block pdm360ng_touchscreen_nb = {
  90         .notifier_call = pdm360ng_touchscreen_notifier_call,
  91 };
  92
  93 static 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
 101 static inline void __init pdm360ng_touchscreen_init(void)
 102 {
 103 }
 104 #endif /* CONFIG_TOUCHSCREEN_ADS7846 */
 105
 106 void __init pdm360ng_init(void)
 107 {
 108         mpc512x_init();
 109         pdm360ng_touchscreen_init();
 110 }
 111
 112 static 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
 119 define_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 };