projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 828989ad SS |
1 | /* |
| 2 | * Keystone2 based boards and SOC related code. | |
| 3 | * | |
| 4 | * Copyright 2013 Texas Instruments, Inc. | |
| 5 | * Cyril Chemparathy <cyril@ti.com> | |
| 6 | * Santosh Shilimkar <santosh.shillimkar@ti.com> | |
| 7 | * | |
| 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. | |
| 11 | */ | |
| 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> | |
| 17 | ||
| 18 | #include <asm/setup.h> | |
| 19 | #include <asm/mach/map.h> | |
| 20 | #include <asm/mach/arch.h> | |
| 21 | #include <asm/mach/time.h> | |
| 22 | ||
| 23 | #define PLL_RESET_WRITE_KEY_MASK 0xffff0000 | |
| 24 | #define PLL_RESET_WRITE_KEY 0x5a69 | |
| 25 | #define PLL_RESET BIT(16) | |
| 26 | ||
| 27 | static void __iomem *keystone_rstctrl; | |
| 28 | ||
| 29 | static void __init keystone_init(void) | |
| 30 | { | |
| 31 | struct device_node *node; | |
| 32 | ||
| 33 | node = of_find_compatible_node(NULL, NULL, "ti,keystone-reset"); | |
| 34 | if (WARN_ON(!node)) | |
| 35 | pr_warn("ti,keystone-reset node undefined\n"); | |
| 36 | ||
| 37 | keystone_rstctrl = of_iomap(node, 0); | |
| 38 | if (WARN_ON(!keystone_rstctrl)) | |
| 39 | pr_warn("ti,keystone-reset iomap error\n"); | |
| 40 | ||
| 41 | of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL); | |
| 42 | } | |
| 43 | ||
| 44 | static const char *keystone_match[] __initconst = { | |
| 45 | "ti,keystone-evm", | |
| 46 | NULL, | |
| 47 | }; | |
| 48 | ||
| 49 | void keystone_restart(char mode, const char *cmd) | |
| 50 | { | |
| 51 | u32 val; | |
| 52 | ||
| 53 | BUG_ON(!keystone_rstctrl); | |
| 54 | ||
| 55 | /* Enable write access to RSTCTRL */ | |
| 56 | val = readl(keystone_rstctrl); | |
| 57 | val &= PLL_RESET_WRITE_KEY_MASK; | |
| 58 | val |= PLL_RESET_WRITE_KEY; | |
| 59 | writel(val, keystone_rstctrl); | |
| 60 | ||
| 61 | /* Reset the SOC */ | |
| 62 | val = readl(keystone_rstctrl); | |
| 63 | val &= ~PLL_RESET; | |
| 64 | writel(val, keystone_rstctrl); | |
| 65 | } | |
| 66 | ||
| 67 | DT_MACHINE_START(KEYSTONE, "Keystone") | |
| 68 | .init_machine = keystone_init, | |
| 69 | .dt_compat = keystone_match, | |
| 70 | .restart = keystone_restart, | |
| 71 | MACHINE_END |