1 /* 2 * Copyright 2011 Freescale Semiconductor, Inc. 3 * Copyright 2011 Linaro Ltd. 4 * 5 * The code contained herein is licensed under the GNU General Public 6 * License. You may obtain a copy of the GNU General Public License 7 * Version 2 or later at the following locations: 8 * 9 * http://www.opensource.org/licenses/gpl-license.html 10 * http://www.gnu.org/copyleft/gpl.html 11 */ 12 13 #include <linux/delay.h> 14 #include <linux/init.h> 15 #include <linux/io.h> 16 #include <linux/irq.h> 17 #include <linux/irqdomain.h> 18 #include <linux/of.h> 19 #include <linux/of_address.h> 20 #include <linux/of_irq.h> 21 #include <linux/of_platform.h> 22 #include <linux/phy.h> 23 #include <linux/micrel_phy.h> 24 #include <asm/hardware/cache-l2x0.h> 25 #include <asm/hardware/gic.h> 26 #include <asm/mach/arch.h> 27 #include <asm/mach/time.h> 28 #include <mach/common.h> 29 #include <mach/hardware.h> 30 31 void imx6q_restart(char mode, const char *cmd) 32 { 33 struct device_node *np; 34 void __iomem *wdog_base; 35 36 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt"); 37 wdog_base = of_iomap(np, 0); 38 if (!wdog_base) 39 goto soft; 40 41 imx_src_prepare_restart(); 42 43 /* enable wdog */ 44 writew_relaxed(1 << 2, wdog_base); 45 /* write twice to ensure the request will not get ignored */ 46 writew_relaxed(1 << 2, wdog_base); 47 48 /* wait for reset to assert ... */ 49 mdelay(500); 50 51 pr_err("Watchdog reset failed to assert reset\n"); 52 53 /* delay to allow the serial port to show the message */ 54 mdelay(50); 55 56 soft: 57 /* we'll take a jump through zero as a poor second */ 58 soft_restart(0); 59 } 60 61 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */ 62 static int ksz9021rn_phy_fixup(struct phy_device *phydev) 63 { 64 /* min rx data delay */ 65 phy_write(phydev, 0x0b, 0x8105); 66 phy_write(phydev, 0x0c, 0x0000); 67 68 /* max rx/tx clock delay, min rx/tx control delay */ 69 phy_write(phydev, 0x0b, 0x8104); 70 phy_write(phydev, 0x0c, 0xf0f0); 71 phy_write(phydev, 0x0b, 0x104); 72 73 return 0; 74 } 75 76 static void __init imx6q_init_machine(void) 77 { 78 if (of_machine_is_compatible("fsl,imx6q-sabrelite")) 79 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK, 80 ksz9021rn_phy_fixup); 81 82 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 83 84 imx6q_pm_init(); 85 } 86 87 static void __init imx6q_map_io(void) 88 { 89 imx_lluart_map_io(); 90 imx_scu_map_io(); 91 imx6q_clock_map_io(); 92 } 93 94 static int __init imx6q_gpio_add_irq_domain(struct device_node *np, 95 struct device_node *interrupt_parent) 96 { 97 static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS; 98 99 gpio_irq_base -= 32; 100 irq_domain_add_simple(np, gpio_irq_base); 101 102 return 0; 103 } 104 105 static const struct of_device_id imx6q_irq_match[] __initconst = { 106 { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, }, 107 { .compatible = "fsl,imx6q-gpio", .data = imx6q_gpio_add_irq_domain, }, 108 { /* sentinel */ } 109 }; 110 111 static void __init imx6q_init_irq(void) 112 { 113 l2x0_of_init(0, ~0UL); 114 imx_src_init(); 115 imx_gpc_init(); 116 of_irq_init(imx6q_irq_match); 117 } 118 119 static void __init imx6q_timer_init(void) 120 { 121 mx6q_clocks_init(); 122 } 123 124 static struct sys_timer imx6q_timer = { 125 .init = imx6q_timer_init, 126 }; 127 128 static const char *imx6q_dt_compat[] __initdata = { 129 "fsl,imx6q-arm2", 130 "fsl,imx6q-sabrelite", 131 NULL, 132 }; 133 134 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)") 135 .map_io = imx6q_map_io, 136 .init_irq = imx6q_init_irq, 137 .handle_irq = imx6q_handle_irq, 138 .timer = &imx6q_timer, 139 .init_machine = imx6q_init_machine, 140 .dt_compat = imx6q_dt_compat, 141 .restart = imx6q_restart, 142 MACHINE_END 143