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/smp_twd.h> 25 #include <asm/hardware/cache-l2x0.h> 26 #include <asm/hardware/gic.h> 27 #include <asm/mach/arch.h> 28 #include <asm/mach/time.h> 29 #include <asm/system_misc.h> 30 #include <mach/common.h> 31 #include <mach/hardware.h> 32 33 void imx6q_restart(char mode, const char *cmd) 34 { 35 struct device_node *np; 36 void __iomem *wdog_base; 37 38 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt"); 39 wdog_base = of_iomap(np, 0); 40 if (!wdog_base) 41 goto soft; 42 43 imx_src_prepare_restart(); 44 45 /* enable wdog */ 46 writew_relaxed(1 << 2, wdog_base); 47 /* write twice to ensure the request will not get ignored */ 48 writew_relaxed(1 << 2, wdog_base); 49 50 /* wait for reset to assert ... */ 51 mdelay(500); 52 53 pr_err("Watchdog reset failed to assert reset\n"); 54 55 /* delay to allow the serial port to show the message */ 56 mdelay(50); 57 58 soft: 59 /* we'll take a jump through zero as a poor second */ 60 soft_restart(0); 61 } 62 63 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */ 64 static int ksz9021rn_phy_fixup(struct phy_device *phydev) 65 { 66 /* min rx data delay */ 67 phy_write(phydev, 0x0b, 0x8105); 68 phy_write(phydev, 0x0c, 0x0000); 69 70 /* max rx/tx clock delay, min rx/tx control delay */ 71 phy_write(phydev, 0x0b, 0x8104); 72 phy_write(phydev, 0x0c, 0xf0f0); 73 phy_write(phydev, 0x0b, 0x104); 74 75 return 0; 76 } 77 78 static void __init imx6q_init_machine(void) 79 { 80 if (of_machine_is_compatible("fsl,imx6q-sabrelite")) 81 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK, 82 ksz9021rn_phy_fixup); 83 84 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 85 86 imx6q_pm_init(); 87 } 88 89 static void __init imx6q_map_io(void) 90 { 91 imx_lluart_map_io(); 92 imx_scu_map_io(); 93 imx6q_clock_map_io(); 94 } 95 96 static int __init imx6q_gpio_add_irq_domain(struct device_node *np, 97 struct device_node *interrupt_parent) 98 { 99 static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS; 100 101 gpio_irq_base -= 32; 102 irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops, 103 NULL); 104 105 return 0; 106 } 107 108 static const struct of_device_id imx6q_irq_match[] __initconst = { 109 { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, }, 110 { .compatible = "fsl,imx6q-gpio", .data = imx6q_gpio_add_irq_domain, }, 111 { /* sentinel */ } 112 }; 113 114 static void __init imx6q_init_irq(void) 115 { 116 l2x0_of_init(0, ~0UL); 117 imx_src_init(); 118 imx_gpc_init(); 119 of_irq_init(imx6q_irq_match); 120 } 121 122 static void __init imx6q_timer_init(void) 123 { 124 mx6q_clocks_init(); 125 twd_local_timer_of_register(); 126 } 127 128 static struct sys_timer imx6q_timer = { 129 .init = imx6q_timer_init, 130 }; 131 132 static const char *imx6q_dt_compat[] __initdata = { 133 "fsl,imx6q-arm2", 134 "fsl,imx6q-sabrelite", 135 "fsl,imx6q", 136 NULL, 137 }; 138 139 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)") 140 .map_io = imx6q_map_io, 141 .init_irq = imx6q_init_irq, 142 .handle_irq = imx6q_handle_irq, 143 .timer = &imx6q_timer, 144 .init_machine = imx6q_init_machine, 145 .dt_compat = imx6q_dt_compat, 146 .restart = imx6q_restart, 147 MACHINE_END 148