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/clk.h> 14 #include <linux/clkdev.h> 15 #include <linux/cpuidle.h> 16 #include <linux/delay.h> 17 #include <linux/export.h> 18 #include <linux/init.h> 19 #include <linux/io.h> 20 #include <linux/irq.h> 21 #include <linux/of.h> 22 #include <linux/of_address.h> 23 #include <linux/of_irq.h> 24 #include <linux/of_platform.h> 25 #include <linux/phy.h> 26 #include <linux/regmap.h> 27 #include <linux/micrel_phy.h> 28 #include <linux/mfd/syscon.h> 29 #include <asm/cpuidle.h> 30 #include <asm/smp_twd.h> 31 #include <asm/hardware/cache-l2x0.h> 32 #include <asm/hardware/gic.h> 33 #include <asm/mach/arch.h> 34 #include <asm/mach/time.h> 35 #include <asm/system_misc.h> 36 #include <mach/common.h> 37 #include <mach/cpuidle.h> 38 #include <mach/hardware.h> 39 40 41 void imx6q_restart(char mode, const char *cmd) 42 { 43 struct device_node *np; 44 void __iomem *wdog_base; 45 46 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt"); 47 wdog_base = of_iomap(np, 0); 48 if (!wdog_base) 49 goto soft; 50 51 imx_src_prepare_restart(); 52 53 /* enable wdog */ 54 writew_relaxed(1 << 2, wdog_base); 55 /* write twice to ensure the request will not get ignored */ 56 writew_relaxed(1 << 2, wdog_base); 57 58 /* wait for reset to assert ... */ 59 mdelay(500); 60 61 pr_err("Watchdog reset failed to assert reset\n"); 62 63 /* delay to allow the serial port to show the message */ 64 mdelay(50); 65 66 soft: 67 /* we'll take a jump through zero as a poor second */ 68 soft_restart(0); 69 } 70 71 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */ 72 static int ksz9021rn_phy_fixup(struct phy_device *phydev) 73 { 74 if (IS_BUILTIN(CONFIG_PHYLIB)) { 75 /* min rx data delay */ 76 phy_write(phydev, 0x0b, 0x8105); 77 phy_write(phydev, 0x0c, 0x0000); 78 79 /* max rx/tx clock delay, min rx/tx control delay */ 80 phy_write(phydev, 0x0b, 0x8104); 81 phy_write(phydev, 0x0c, 0xf0f0); 82 phy_write(phydev, 0x0b, 0x104); 83 } 84 85 return 0; 86 } 87 88 static void __init imx6q_sabrelite_cko1_setup(void) 89 { 90 struct clk *cko1_sel, *ahb, *cko1; 91 unsigned long rate; 92 93 cko1_sel = clk_get_sys(NULL, "cko1_sel"); 94 ahb = clk_get_sys(NULL, "ahb"); 95 cko1 = clk_get_sys(NULL, "cko1"); 96 if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) { 97 pr_err("cko1 setup failed!\n"); 98 goto put_clk; 99 } 100 clk_set_parent(cko1_sel, ahb); 101 rate = clk_round_rate(cko1, 16000000); 102 clk_set_rate(cko1, rate); 103 put_clk: 104 if (!IS_ERR(cko1_sel)) 105 clk_put(cko1_sel); 106 if (!IS_ERR(ahb)) 107 clk_put(ahb); 108 if (!IS_ERR(cko1)) 109 clk_put(cko1); 110 } 111 112 static void __init imx6q_sabrelite_init(void) 113 { 114 if (IS_BUILTIN(CONFIG_PHYLIB)) 115 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK, 116 ksz9021rn_phy_fixup); 117 imx6q_sabrelite_cko1_setup(); 118 } 119 120 static void __init imx6q_usb_init(void) 121 { 122 struct regmap *anatop; 123 124 #define HW_ANADIG_USB1_CHRG_DETECT 0x000001b0 125 #define HW_ANADIG_USB2_CHRG_DETECT 0x00000210 126 127 #define BM_ANADIG_USB_CHRG_DETECT_EN_B 0x00100000 128 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B 0x00080000 129 130 anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop"); 131 if (!IS_ERR(anatop)) { 132 /* 133 * The external charger detector needs to be disabled, 134 * or the signal at DP will be poor 135 */ 136 regmap_write(anatop, HW_ANADIG_USB1_CHRG_DETECT, 137 BM_ANADIG_USB_CHRG_DETECT_EN_B 138 | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B); 139 regmap_write(anatop, HW_ANADIG_USB2_CHRG_DETECT, 140 BM_ANADIG_USB_CHRG_DETECT_EN_B | 141 BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B); 142 } else { 143 pr_warn("failed to find fsl,imx6q-anatop regmap\n"); 144 } 145 } 146 147 static void __init imx6q_init_machine(void) 148 { 149 if (of_machine_is_compatible("fsl,imx6q-sabrelite")) 150 imx6q_sabrelite_init(); 151 152 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 153 154 imx6q_pm_init(); 155 imx6q_usb_init(); 156 } 157 158 static struct cpuidle_driver imx6q_cpuidle_driver = { 159 .name = "imx6q_cpuidle", 160 .owner = THIS_MODULE, 161 .en_core_tk_irqen = 1, 162 .states[0] = ARM_CPUIDLE_WFI_STATE, 163 .state_count = 1, 164 }; 165 166 static void __init imx6q_init_late(void) 167 { 168 imx_cpuidle_init(&imx6q_cpuidle_driver); 169 } 170 171 static void __init imx6q_map_io(void) 172 { 173 imx_lluart_map_io(); 174 imx_scu_map_io(); 175 imx6q_clock_map_io(); 176 } 177 178 static const struct of_device_id imx6q_irq_match[] __initconst = { 179 { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, }, 180 { /* sentinel */ } 181 }; 182 183 static void __init imx6q_init_irq(void) 184 { 185 l2x0_of_init(0, ~0UL); 186 imx_src_init(); 187 imx_gpc_init(); 188 of_irq_init(imx6q_irq_match); 189 } 190 191 static void __init imx6q_timer_init(void) 192 { 193 mx6q_clocks_init(); 194 twd_local_timer_of_register(); 195 } 196 197 static struct sys_timer imx6q_timer = { 198 .init = imx6q_timer_init, 199 }; 200 201 static const char *imx6q_dt_compat[] __initdata = { 202 "fsl,imx6q", 203 NULL, 204 }; 205 206 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)") 207 .smp = smp_ops(imx_smp_ops), 208 .map_io = imx6q_map_io, 209 .init_irq = imx6q_init_irq, 210 .handle_irq = imx6q_handle_irq, 211 .timer = &imx6q_timer, 212 .init_machine = imx6q_init_machine, 213 .init_late = imx6q_init_late, 214 .dt_compat = imx6q_dt_compat, 215 .restart = imx6q_restart, 216 MACHINE_END 217