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/pinctrl/machine.h> 26 #include <linux/phy.h> 27 #include <linux/micrel_phy.h> 28 #include <linux/mfd/anatop.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 clk_register_clkdev(cko1, NULL, "0-000a"); 104 put_clk: 105 if (!IS_ERR(cko1_sel)) 106 clk_put(cko1_sel); 107 if (!IS_ERR(ahb)) 108 clk_put(ahb); 109 if (!IS_ERR(cko1)) 110 clk_put(cko1); 111 } 112 113 static void __init imx6q_sabrelite_init(void) 114 { 115 if (IS_BUILTIN(CONFIG_PHYLIB)) 116 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK, 117 ksz9021rn_phy_fixup); 118 imx6q_sabrelite_cko1_setup(); 119 } 120 121 static void __init imx6q_usb_init(void) 122 { 123 struct device_node *np; 124 struct platform_device *pdev = NULL; 125 struct anatop *adata = NULL; 126 127 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop"); 128 if (np) 129 pdev = of_find_device_by_node(np); 130 if (pdev) 131 adata = platform_get_drvdata(pdev); 132 if (!adata) { 133 if (np) 134 of_node_put(np); 135 return; 136 } 137 138 #define HW_ANADIG_USB1_CHRG_DETECT 0x000001b0 139 #define HW_ANADIG_USB2_CHRG_DETECT 0x00000210 140 141 #define BM_ANADIG_USB_CHRG_DETECT_EN_B 0x00100000 142 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B 0x00080000 143 144 /* 145 * The external charger detector needs to be disabled, 146 * or the signal at DP will be poor 147 */ 148 anatop_write_reg(adata, HW_ANADIG_USB1_CHRG_DETECT, 149 BM_ANADIG_USB_CHRG_DETECT_EN_B 150 | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B, 151 ~0); 152 anatop_write_reg(adata, HW_ANADIG_USB2_CHRG_DETECT, 153 BM_ANADIG_USB_CHRG_DETECT_EN_B | 154 BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B, 155 ~0); 156 157 of_node_put(np); 158 } 159 160 static void __init imx6q_init_machine(void) 161 { 162 /* 163 * This should be removed when all imx6q boards have pinctrl 164 * states for devices defined in device tree. 165 */ 166 pinctrl_provide_dummies(); 167 168 if (of_machine_is_compatible("fsl,imx6q-sabrelite")) 169 imx6q_sabrelite_init(); 170 171 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); 172 173 imx6q_pm_init(); 174 imx6q_usb_init(); 175 } 176 177 static struct cpuidle_driver imx6q_cpuidle_driver = { 178 .name = "imx6q_cpuidle", 179 .owner = THIS_MODULE, 180 .en_core_tk_irqen = 1, 181 .states[0] = ARM_CPUIDLE_WFI_STATE, 182 .state_count = 1, 183 }; 184 185 static void __init imx6q_init_late(void) 186 { 187 imx_cpuidle_init(&imx6q_cpuidle_driver); 188 } 189 190 static void __init imx6q_map_io(void) 191 { 192 imx_lluart_map_io(); 193 imx_scu_map_io(); 194 imx6q_clock_map_io(); 195 } 196 197 static const struct of_device_id imx6q_irq_match[] __initconst = { 198 { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, }, 199 { /* sentinel */ } 200 }; 201 202 static void __init imx6q_init_irq(void) 203 { 204 l2x0_of_init(0, ~0UL); 205 imx_src_init(); 206 imx_gpc_init(); 207 of_irq_init(imx6q_irq_match); 208 } 209 210 static void __init imx6q_timer_init(void) 211 { 212 mx6q_clocks_init(); 213 twd_local_timer_of_register(); 214 } 215 216 static struct sys_timer imx6q_timer = { 217 .init = imx6q_timer_init, 218 }; 219 220 static const char *imx6q_dt_compat[] __initdata = { 221 "fsl,imx6q-arm2", 222 "fsl,imx6q-sabrelite", 223 "fsl,imx6q-sabresd", 224 "fsl,imx6q", 225 NULL, 226 }; 227 228 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)") 229 .map_io = imx6q_map_io, 230 .init_irq = imx6q_init_irq, 231 .handle_irq = imx6q_handle_irq, 232 .timer = &imx6q_timer, 233 .init_machine = imx6q_init_machine, 234 .init_late = imx6q_init_late, 235 .dt_compat = imx6q_dt_compat, 236 .restart = imx6q_restart, 237 MACHINE_END 238