Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / arch / arm / mach-keystone / keystone.c
blob6e6bb7d5ea308ca890e56439481b51e211437346
1 /*
2 * Keystone2 based boards and SOC related code.
4 * Copyright 2013 Texas Instruments, Inc.
5 * Cyril Chemparathy <cyril@ti.com>
6 * Santosh Shilimkar <santosh.shillimkar@ti.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms and conditions of the GNU General Public License,
10 * version 2, as published by the Free Software Foundation.
12 #include <linux/io.h>
13 #include <linux/of.h>
14 #include <linux/init.h>
15 #include <linux/of_platform.h>
16 #include <linux/of_address.h>
18 #include <asm/setup.h>
19 #include <asm/mach/map.h>
20 #include <asm/mach/arch.h>
21 #include <asm/mach/time.h>
22 #include <asm/smp_plat.h>
24 #include "keystone.h"
26 #define PLL_RESET_WRITE_KEY_MASK 0xffff0000
27 #define PLL_RESET_WRITE_KEY 0x5a69
28 #define PLL_RESET BIT(16)
30 static void __iomem *keystone_rstctrl;
32 static void __init keystone_init(void)
34 struct device_node *node;
36 node = of_find_compatible_node(NULL, NULL, "ti,keystone-reset");
37 if (WARN_ON(!node))
38 pr_warn("ti,keystone-reset node undefined\n");
40 keystone_rstctrl = of_iomap(node, 0);
41 if (WARN_ON(!keystone_rstctrl))
42 pr_warn("ti,keystone-reset iomap error\n");
44 keystone_pm_runtime_init();
45 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
48 static const char *keystone_match[] __initconst = {
49 "ti,keystone-evm",
50 NULL,
53 void keystone_restart(enum reboot_mode mode, const char *cmd)
55 u32 val;
57 BUG_ON(!keystone_rstctrl);
59 /* Enable write access to RSTCTRL */
60 val = readl(keystone_rstctrl);
61 val &= PLL_RESET_WRITE_KEY_MASK;
62 val |= PLL_RESET_WRITE_KEY;
63 writel(val, keystone_rstctrl);
65 /* Reset the SOC */
66 val = readl(keystone_rstctrl);
67 val &= ~PLL_RESET;
68 writel(val, keystone_rstctrl);
71 DT_MACHINE_START(KEYSTONE, "Keystone")
72 #if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
73 .dma_zone_size = SZ_2G,
74 #endif
75 .smp = smp_ops(keystone_smp_ops),
76 .init_machine = keystone_init,
77 .dt_compat = keystone_match,
78 .restart = keystone_restart,
79 MACHINE_END