129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2010 DENX Software Engineering
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*
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* Anatolij Gustschin, <agust@denx.de>
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*
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* PDM360NG board setup
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/of_address.h>
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#include <linux/of_fdt.h>
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#include <linux/of_platform.h>
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#include <asm/machdep.h>
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#include <asm/ipic.h>
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#include "mpc512x.h"
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#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
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defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
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#include <linux/interrupt.h>
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#include <linux/spi/ads7846.h>
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#include <linux/spi/spi.h>
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#include <linux/notifier.h>
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static void *pdm360ng_gpio_base;
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static int pdm360ng_get_pendown_state(void)
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{
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u32 reg;
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reg = in_be32(pdm360ng_gpio_base + 0xc);
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if (reg & 0x40)
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setbits32(pdm360ng_gpio_base + 0xc, 0x40);
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reg = in_be32(pdm360ng_gpio_base + 0x8);
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/* return 1 if pen is down */
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return (reg & 0x40) == 0;
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}
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static struct ads7846_platform_data pdm360ng_ads7846_pdata = {
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.model = 7845,
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.get_pendown_state = pdm360ng_get_pendown_state,
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.irq_flags = IRQF_TRIGGER_LOW,
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};
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static int __init pdm360ng_penirq_init(void)
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{
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struct device_node *np;
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np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121-gpio");
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if (!np) {
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pr_err("%s: Can't find 'mpc5121-gpio' node\n", __func__);
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return -ENODEV;
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}
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pdm360ng_gpio_base = of_iomap(np, 0);
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of_node_put(np);
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if (!pdm360ng_gpio_base) {
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pr_err("%s: Can't map gpio regs.\n", __func__);
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return -ENODEV;
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}
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out_be32(pdm360ng_gpio_base + 0xc, 0xffffffff);
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setbits32(pdm360ng_gpio_base + 0x18, 0x2000);
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setbits32(pdm360ng_gpio_base + 0x10, 0x40);
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return 0;
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}
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static int pdm360ng_touchscreen_notifier_call(struct notifier_block *nb,
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unsigned long event, void *__dev)
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{
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struct device *dev = __dev;
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if ((event == BUS_NOTIFY_ADD_DEVICE) &&
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of_device_is_compatible(dev->of_node, "ti,ads7846")) {
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dev->platform_data = &pdm360ng_ads7846_pdata;
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return NOTIFY_OK;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block pdm360ng_touchscreen_nb = {
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.notifier_call = pdm360ng_touchscreen_notifier_call,
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};
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static void __init pdm360ng_touchscreen_init(void)
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{
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if (pdm360ng_penirq_init())
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return;
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bus_register_notifier(&spi_bus_type, &pdm360ng_touchscreen_nb);
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}
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#else
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static inline void __init pdm360ng_touchscreen_init(void)
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{
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}
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#endif /* CONFIG_TOUCHSCREEN_ADS7846 */
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void __init pdm360ng_init(void)
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{
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mpc512x_init();
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pdm360ng_touchscreen_init();
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}
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static int __init pdm360ng_probe(void)
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{
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if (!of_machine_is_compatible("ifm,pdm360ng"))
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return 0;
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mpc512x_init_early();
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return 1;
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}
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define_machine(pdm360ng) {
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.name = "PDM360NG",
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.probe = pdm360ng_probe,
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.setup_arch = mpc512x_setup_arch,
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.init = pdm360ng_init,
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.init_IRQ = mpc512x_init_IRQ,
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.get_irq = ipic_get_irq,
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.calibrate_decr = generic_calibrate_decr,
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.restart = mpc512x_restart,
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};
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