cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pdm360ng.c (2818B)

      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};