2 * Copyright 2011 Freescale Semiconductor, Inc.
3 * Copyright 2011 Linaro Ltd.
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:
9 * http://www.opensource.org/licenses/gpl-license.html
10 * http://www.gnu.org/copyleft/gpl.html
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>
20 #include <linux/irq.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>
41 void imx6q_restart(char mode, const char *cmd)
43 struct device_node *np;
44 void __iomem *wdog_base;
46 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
47 wdog_base = of_iomap(np, 0);
51 imx_src_prepare_restart();
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);
58 /* wait for reset to assert ... */
61 pr_err("Watchdog reset failed to assert reset\n");
63 /* delay to allow the serial port to show the message */
67 /* we'll take a jump through zero as a poor second */
71 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
72 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
74 if (IS_BUILTIN(CONFIG_PHYLIB)) {
75 /* min rx data delay */
76 phy_write(phydev, 0x0b, 0x8105);
77 phy_write(phydev, 0x0c, 0x0000);
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);
88 static void __init imx6q_sabrelite_cko1_setup(void)
90 struct clk *cko1_sel, *ahb, *cko1;
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");
100 clk_set_parent(cko1_sel, ahb);
101 rate = clk_round_rate(cko1, 16000000);
102 clk_set_rate(cko1, rate);
104 if (!IS_ERR(cko1_sel))
112 static void __init imx6q_sabrelite_init(void)
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();
120 static void __init imx6q_1588_init(void)
124 gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
126 regmap_update_bits(gpr, 0x4, 1 << 21, 1 << 21);
128 pr_err("failed to find fsl,imx6q-iomux-gpr regmap\n");
131 static void __init imx6q_usb_init(void)
133 struct regmap *anatop;
135 #define HW_ANADIG_USB1_CHRG_DETECT 0x000001b0
136 #define HW_ANADIG_USB2_CHRG_DETECT 0x00000210
138 #define BM_ANADIG_USB_CHRG_DETECT_EN_B 0x00100000
139 #define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B 0x00080000
141 anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
142 if (!IS_ERR(anatop)) {
144 * The external charger detector needs to be disabled,
145 * or the signal at DP will be poor
147 regmap_write(anatop, HW_ANADIG_USB1_CHRG_DETECT,
148 BM_ANADIG_USB_CHRG_DETECT_EN_B
149 | BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
150 regmap_write(anatop, HW_ANADIG_USB2_CHRG_DETECT,
151 BM_ANADIG_USB_CHRG_DETECT_EN_B |
152 BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
154 pr_warn("failed to find fsl,imx6q-anatop regmap\n");
158 static void __init imx6q_init_machine(void)
160 if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
161 imx6q_sabrelite_init();
163 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
170 static struct cpuidle_driver imx6q_cpuidle_driver = {
171 .name = "imx6q_cpuidle",
172 .owner = THIS_MODULE,
173 .en_core_tk_irqen = 1,
174 .states[0] = ARM_CPUIDLE_WFI_STATE,
178 static void __init imx6q_init_late(void)
180 imx_cpuidle_init(&imx6q_cpuidle_driver);
183 static void __init imx6q_map_io(void)
187 imx6q_clock_map_io();
190 static const struct of_device_id imx6q_irq_match[] __initconst = {
191 { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
195 static void __init imx6q_init_irq(void)
197 l2x0_of_init(0, ~0UL);
200 of_irq_init(imx6q_irq_match);
203 static void __init imx6q_timer_init(void)
206 twd_local_timer_of_register();
209 static struct sys_timer imx6q_timer = {
210 .init = imx6q_timer_init,
213 static const char *imx6q_dt_compat[] __initdata = {
218 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
219 .smp = smp_ops(imx_smp_ops),
220 .map_io = imx6q_map_io,
221 .init_irq = imx6q_init_irq,
222 .handle_irq = imx6q_handle_irq,
223 .timer = &imx6q_timer,
224 .init_machine = imx6q_init_machine,
225 .init_late = imx6q_init_late,
226 .dt_compat = imx6q_dt_compat,
227 .restart = imx6q_restart,