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 static 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 }; 127