Merge remote-tracking branch 'korg_arm-soc/timer/cleanup' into cleanup
[linux-3.10.git] / arch / arm / mach-sunxi / sunxi.c
1 /*
2  * Device Tree support for Allwinner A1X SoCs
3  *
4  * Copyright (C) 2012 Maxime Ripard
5  *
6  * Maxime Ripard <maxime.ripard@free-electrons.com>
7  *
8  * This file is licensed under the terms of the GNU General Public
9  * License version 2.  This program is licensed "as is" without any
10  * warranty of any kind, whether express or implied.
11  */
12
13 #include <linux/delay.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/of_address.h>
17 #include <linux/of_irq.h>
18 #include <linux/of_platform.h>
19 #include <linux/io.h>
20 #include <linux/sunxi_timer.h>
21
22 #include <linux/irqchip/sunxi.h>
23
24 #include <asm/hardware/vic.h>
25
26 #include <asm/mach/arch.h>
27 #include <asm/mach/map.h>
28
29 #include "sunxi.h"
30
31 #define WATCHDOG_CTRL_REG       0x00
32 #define WATCHDOG_MODE_REG       0x04
33
34 static void __iomem *wdt_base;
35
36 static void sunxi_setup_restart(void)
37 {
38         struct device_node *np = of_find_compatible_node(NULL, NULL,
39                                                 "allwinner,sunxi-wdt");
40         if (WARN(!np, "unable to setup watchdog restart"))
41                 return;
42
43         wdt_base = of_iomap(np, 0);
44         WARN(!wdt_base, "failed to map watchdog base address");
45 }
46
47 static void sunxi_restart(char mode, const char *cmd)
48 {
49         if (!wdt_base)
50                 return;
51
52         /* Enable timer and set reset bit in the watchdog */
53         writel(3, wdt_base + WATCHDOG_MODE_REG);
54         writel(0xa57 << 1 | 1, wdt_base + WATCHDOG_CTRL_REG);
55         while(1) {
56                 mdelay(5);
57                 writel(3, wdt_base + WATCHDOG_MODE_REG);
58         }
59 }
60
61 static struct map_desc sunxi_io_desc[] __initdata = {
62         {
63                 .virtual        = (unsigned long) SUNXI_REGS_VIRT_BASE,
64                 .pfn            = __phys_to_pfn(SUNXI_REGS_PHYS_BASE),
65                 .length         = SUNXI_REGS_SIZE,
66                 .type           = MT_DEVICE,
67         },
68 };
69
70 void __init sunxi_map_io(void)
71 {
72         iotable_init(sunxi_io_desc, ARRAY_SIZE(sunxi_io_desc));
73 }
74
75 static void __init sunxi_dt_init(void)
76 {
77         sunxi_setup_restart();
78
79         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
80 }
81
82 static const char * const sunxi_board_dt_compat[] = {
83         "allwinner,sun4i-a10",
84         "allwinner,sun5i-a13",
85         NULL,
86 };
87
88 DT_MACHINE_START(SUNXI_DT, "Allwinner A1X (Device Tree)")
89         .init_machine   = sunxi_dt_init,
90         .map_io         = sunxi_map_io,
91         .init_irq       = sunxi_init_irq,
92         .handle_irq     = sunxi_handle_irq,
93         .restart        = sunxi_restart,
94         .init_time      = &sunxi_timer_init,
95         .dt_compat      = sunxi_board_dt_compat,
96 MACHINE_END