ARM: picoxcell: remove .nr_irqs reference
[sfrench/cifs-2.6.git] / arch / arm / mach-picoxcell / common.c
1 /*
2  * Copyright (c) 2011 Picochip Ltd., Jamie Iles
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * All enquiries to support@picochip.com
9  */
10 #include <linux/delay.h>
11 #include <linux/of.h>
12 #include <linux/of_address.h>
13 #include <linux/of_platform.h>
14 #include <linux/dw_apb_timer.h>
15
16 #include <asm/mach/arch.h>
17 #include <asm/mach/map.h>
18
19 #define PHYS_TO_IO(x)                   (((x) & 0x00ffffff) | 0xfe000000)
20 #define PICOXCELL_PERIPH_BASE           0x80000000
21 #define PICOXCELL_PERIPH_LENGTH         SZ_4M
22
23 #define WDT_CTRL_REG_EN_MASK            (1 << 0)
24 #define WDT_CTRL_REG_OFFS               (0x00)
25 #define WDT_TIMEOUT_REG_OFFS            (0x04)
26 static void __iomem *wdt_regs;
27
28 /*
29  * The machine restart method can be called from an atomic context so we won't
30  * be able to ioremap the regs then.
31  */
32 static void picoxcell_setup_restart(void)
33 {
34         struct device_node *np = of_find_compatible_node(NULL, NULL,
35                                                          "snps,dw-apb-wdg");
36         if (WARN(!np, "unable to setup watchdog restart"))
37                 return;
38
39         wdt_regs = of_iomap(np, 0);
40         WARN(!wdt_regs, "failed to remap watchdog regs");
41 }
42
43 static struct map_desc io_map __initdata = {
44         .virtual        = PHYS_TO_IO(PICOXCELL_PERIPH_BASE),
45         .pfn            = __phys_to_pfn(PICOXCELL_PERIPH_BASE),
46         .length         = PICOXCELL_PERIPH_LENGTH,
47         .type           = MT_DEVICE,
48 };
49
50 static void __init picoxcell_map_io(void)
51 {
52         iotable_init(&io_map, 1);
53 }
54
55 static void __init picoxcell_init_machine(void)
56 {
57         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
58         picoxcell_setup_restart();
59 }
60
61 static const char *picoxcell_dt_match[] = {
62         "picochip,pc3x2",
63         "picochip,pc3x3",
64         NULL
65 };
66
67 static void picoxcell_wdt_restart(char mode, const char *cmd)
68 {
69         /*
70          * Configure the watchdog to reset with the shortest possible timeout
71          * and give it chance to do the reset.
72          */
73         if (wdt_regs) {
74                 writel_relaxed(WDT_CTRL_REG_EN_MASK, wdt_regs + WDT_CTRL_REG_OFFS);
75                 writel_relaxed(0, wdt_regs + WDT_TIMEOUT_REG_OFFS);
76                 /* No sleeping, possibly atomic. */
77                 mdelay(500);
78         }
79 }
80
81 DT_MACHINE_START(PICOXCELL, "Picochip picoXcell")
82         .map_io         = picoxcell_map_io,
83         .init_time      = dw_apb_timer_init,
84         .init_machine   = picoxcell_init_machine,
85         .dt_compat      = picoxcell_dt_match,
86         .restart        = picoxcell_wdt_restart,
87 MACHINE_END