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