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/delay.h>
16 #include <linux/init.h>
18 #include <linux/irq.h>
19 #include <linux/irqdomain.h>
21 #include <linux/of_address.h>
22 #include <linux/of_irq.h>
23 #include <linux/of_platform.h>
24 #include <linux/phy.h>
25 #include <linux/micrel_phy.h>
26 #include <asm/smp_twd.h>
27 #include <asm/hardware/cache-l2x0.h>
28 #include <asm/hardware/gic.h>
29 #include <asm/mach/arch.h>
30 #include <asm/mach/time.h>
31 #include <asm/system_misc.h>
32 #include <mach/common.h>
33 #include <mach/hardware.h>
35 void imx6q_restart(char mode, const char *cmd)
37 struct device_node *np;
38 void __iomem *wdog_base;
40 np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-wdt");
41 wdog_base = of_iomap(np, 0);
45 imx_src_prepare_restart();
48 writew_relaxed(1 << 2, wdog_base);
49 /* write twice to ensure the request will not get ignored */
50 writew_relaxed(1 << 2, wdog_base);
52 /* wait for reset to assert ... */
55 pr_err("Watchdog reset failed to assert reset\n");
57 /* delay to allow the serial port to show the message */
61 /* we'll take a jump through zero as a poor second */
65 /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
66 static int ksz9021rn_phy_fixup(struct phy_device *phydev)
68 if (IS_ENABLED(CONFIG_PHYLIB)) {
69 /* min rx data delay */
70 phy_write(phydev, 0x0b, 0x8105);
71 phy_write(phydev, 0x0c, 0x0000);
73 /* max rx/tx clock delay, min rx/tx control delay */
74 phy_write(phydev, 0x0b, 0x8104);
75 phy_write(phydev, 0x0c, 0xf0f0);
76 phy_write(phydev, 0x0b, 0x104);
82 static void __init imx6q_sabrelite_cko1_setup(void)
84 struct clk *cko1_sel, *ahb, *cko1;
87 cko1_sel = clk_get_sys(NULL, "cko1_sel");
88 ahb = clk_get_sys(NULL, "ahb");
89 cko1 = clk_get_sys(NULL, "cko1");
90 if (IS_ERR(cko1_sel) || IS_ERR(ahb) || IS_ERR(cko1)) {
91 pr_err("cko1 setup failed!\n");
94 clk_set_parent(cko1_sel, ahb);
95 rate = clk_round_rate(cko1, 16000000);
96 clk_set_rate(cko1, rate);
97 clk_register_clkdev(cko1, NULL, "0-000a");
99 if (!IS_ERR(cko1_sel))
107 static void __init imx6q_sabrelite_init(void)
109 if (IS_ENABLED(CONFIG_PHYLIB))
110 phy_register_fixup_for_uid(PHY_ID_KSZ9021, MICREL_PHY_ID_MASK,
111 ksz9021rn_phy_fixup);
112 imx6q_sabrelite_cko1_setup();
115 static void __init imx6q_init_machine(void)
117 if (of_machine_is_compatible("fsl,imx6q-sabrelite"))
118 imx6q_sabrelite_init();
120 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
125 static void __init imx6q_map_io(void)
129 imx6q_clock_map_io();
132 static int __init imx6q_gpio_add_irq_domain(struct device_node *np,
133 struct device_node *interrupt_parent)
135 static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
138 irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops,
144 static const struct of_device_id imx6q_irq_match[] __initconst = {
145 { .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
146 { .compatible = "fsl,imx6q-gpio", .data = imx6q_gpio_add_irq_domain, },
150 static void __init imx6q_init_irq(void)
152 l2x0_of_init(0, ~0UL);
155 of_irq_init(imx6q_irq_match);
158 static void __init imx6q_timer_init(void)
161 twd_local_timer_of_register();
164 static struct sys_timer imx6q_timer = {
165 .init = imx6q_timer_init,
168 static const char *imx6q_dt_compat[] __initdata = {
170 "fsl,imx6q-sabrelite",
176 DT_MACHINE_START(IMX6Q, "Freescale i.MX6 Quad (Device Tree)")
177 .map_io = imx6q_map_io,
178 .init_irq = imx6q_init_irq,
179 .handle_irq = imx6q_handle_irq,
180 .timer = &imx6q_timer,
181 .init_machine = imx6q_init_machine,
182 .dt_compat = imx6q_dt_compat,
183 .restart = imx6q_restart,