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
  28 static void *pdm360ng_gpio_base;
  29
  30 static 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
  44 static 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
  50 static 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
  73 static 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
  86 static struct notifier_block pdm360ng_touchscreen_nb = {
  87         .notifier_call = pdm360ng_touchscreen_notifier_call,
  88 };
  89
  90 static 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
  98 static inline void __init pdm360ng_touchscreen_init(void)
  99 {
 100 }
 101 #endif /* CONFIG_TOUCHSCREEN_ADS7846 */
 102
 103 void __init pdm360ng_init(void)
 104 {
 105         mpc512x_init();
 106         pdm360ng_touchscreen_init();
 107 }
 108
 109 static 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
 119 define_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 };