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
imx6q_restart(char mode,const char * cmd)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 */
ksz9021rn_phy_fixup(struct phy_device * phydev)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
imx6q_init_machine(void)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
imx6q_map_io(void)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
imx6q_gpio_add_irq_domain(struct device_node * np,struct device_node * interrupt_parent)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
imx6q_init_irq(void)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
imx6q_timer_init(void)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