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Shawn Guo13eed982011-09-06 15:05:25 +08001/*
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
Shawn Guo0575fb72011-12-09 00:51:26 +010013#include <linux/delay.h>
Shawn Guo13eed982011-09-06 15:05:25 +080014#include <linux/init.h>
Shawn Guo0575fb72011-12-09 00:51:26 +010015#include <linux/io.h>
Shawn Guo13eed982011-09-06 15:05:25 +080016#include <linux/irq.h>
17#include <linux/irqdomain.h>
18#include <linux/of.h>
Shawn Guo0575fb72011-12-09 00:51:26 +010019#include <linux/of_address.h>
Shawn Guo13eed982011-09-06 15:05:25 +080020#include <linux/of_irq.h>
21#include <linux/of_platform.h>
Richard Zhao477fce42011-12-14 09:26:47 +080022#include <linux/phy.h>
23#include <linux/micrel_phy.h>
Marc Zyngier58458e02012-01-10 19:44:19 +000024#include <asm/smp_twd.h>
Shawn Guo13eed982011-09-06 15:05:25 +080025#include <asm/hardware/cache-l2x0.h>
26#include <asm/hardware/gic.h>
27#include <asm/mach/arch.h>
28#include <asm/mach/time.h>
David Howells9f97da72012-03-28 18:30:01 +010029#include <asm/system_misc.h>
Shawn Guo13eed982011-09-06 15:05:25 +080030#include <mach/common.h>
31#include <mach/hardware.h>
32
Shawn Guo0575fb72011-12-09 00:51:26 +010033void 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
58soft:
59 /* we'll take a jump through zero as a poor second */
60 soft_restart(0);
61}
62
Richard Zhao477fce42011-12-14 09:26:47 +080063/* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */
64static 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
Shawn Guo13eed982011-09-06 15:05:25 +080078static void __init imx6q_init_machine(void)
79{
Richard Zhao477fce42011-12-14 09:26:47 +080080 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
Shawn Guo13eed982011-09-06 15:05:25 +080084 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
85
86 imx6q_pm_init();
87}
88
89static void __init imx6q_map_io(void)
90{
91 imx_lluart_map_io();
92 imx_scu_map_io();
Richard Zhaof4750582011-11-17 18:54:29 +080093 imx6q_clock_map_io();
Shawn Guo13eed982011-09-06 15:05:25 +080094}
95
Shawn Guo2a3267a2011-12-01 14:35:29 +080096static int __init imx6q_gpio_add_irq_domain(struct device_node *np,
Shawn Guo13eed982011-09-06 15:05:25 +080097 struct device_node *interrupt_parent)
98{
Shawn Guo04aafd72011-12-01 14:49:29 +080099 static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
Shawn Guo13eed982011-09-06 15:05:25 +0800100
Shawn Guo04aafd72011-12-01 14:49:29 +0800101 gpio_irq_base -= 32;
Grant Likely6b783f72012-01-10 17:09:30 -0700102 irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops,
103 NULL);
Shawn Guo2a3267a2011-12-01 14:35:29 +0800104
105 return 0;
Shawn Guo13eed982011-09-06 15:05:25 +0800106}
107
108static 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
114static 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
122static void __init imx6q_timer_init(void)
123{
124 mx6q_clocks_init();
Marc Zyngier58458e02012-01-10 19:44:19 +0000125 twd_local_timer_of_register();
Shawn Guo13eed982011-09-06 15:05:25 +0800126}
127
128static struct sys_timer imx6q_timer = {
129 .init = imx6q_timer_init,
130};
131
132static const char *imx6q_dt_compat[] __initdata = {
Dirk Behme752baf52011-12-08 08:22:01 +0100133 "fsl,imx6q-arm2",
Richard Zhao3c8276c2011-12-14 09:26:46 +0800134 "fsl,imx6q-sabrelite",
Sascha Hauer3f8976d2012-02-17 12:07:00 +0100135 "fsl,imx6q",
Shawn Guo13eed982011-09-06 15:05:25 +0800136 NULL,
137};
138
139DT_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,
Shawn Guo0575fb72011-12-09 00:51:26 +0100146 .restart = imx6q_restart,
Shawn Guo13eed982011-09-06 15:05:25 +0800147MACHINE_END