John Crispin | 8ec6d93 | 2011-03-30 09:27:48 +0200 | [diff] [blame] | 1 | /* |
| 2 | * This program is free software; you can redistribute it and/or modify it |
| 3 | * under the terms of the GNU General Public License version 2 as published |
| 4 | * by the Free Software Foundation. |
| 5 | * |
| 6 | * Copyright (C) 2010 John Crispin <blogic@openwrt.org> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/version.h> |
| 12 | #include <linux/ioport.h> |
| 13 | |
| 14 | #include <lantiq_soc.h> |
| 15 | |
| 16 | /* PMU - the power management unit allows us to turn part of the core |
| 17 | * on and off |
| 18 | */ |
| 19 | |
| 20 | /* the enable / disable registers */ |
| 21 | #define LTQ_PMU_PWDCR 0x1C |
| 22 | #define LTQ_PMU_PWDSR 0x20 |
| 23 | |
| 24 | #define ltq_pmu_w32(x, y) ltq_w32((x), ltq_pmu_membase + (y)) |
| 25 | #define ltq_pmu_r32(x) ltq_r32(ltq_pmu_membase + (x)) |
| 26 | |
| 27 | static struct resource ltq_pmu_resource = { |
| 28 | .name = "pmu", |
| 29 | .start = LTQ_PMU_BASE_ADDR, |
| 30 | .end = LTQ_PMU_BASE_ADDR + LTQ_PMU_SIZE - 1, |
| 31 | .flags = IORESOURCE_MEM, |
| 32 | }; |
| 33 | |
| 34 | static void __iomem *ltq_pmu_membase; |
| 35 | |
| 36 | void ltq_pmu_enable(unsigned int module) |
| 37 | { |
| 38 | int err = 1000000; |
| 39 | |
| 40 | ltq_pmu_w32(ltq_pmu_r32(LTQ_PMU_PWDCR) & ~module, LTQ_PMU_PWDCR); |
| 41 | do {} while (--err && (ltq_pmu_r32(LTQ_PMU_PWDSR) & module)); |
| 42 | |
| 43 | if (!err) |
| 44 | panic("activating PMU module failed!\n"); |
| 45 | } |
| 46 | EXPORT_SYMBOL(ltq_pmu_enable); |
| 47 | |
| 48 | void ltq_pmu_disable(unsigned int module) |
| 49 | { |
| 50 | ltq_pmu_w32(ltq_pmu_r32(LTQ_PMU_PWDCR) | module, LTQ_PMU_PWDCR); |
| 51 | } |
| 52 | EXPORT_SYMBOL(ltq_pmu_disable); |
| 53 | |
| 54 | int __init ltq_pmu_init(void) |
| 55 | { |
| 56 | if (insert_resource(&iomem_resource, <q_pmu_resource) < 0) |
| 57 | panic("Failed to insert pmu memory\n"); |
| 58 | |
| 59 | if (request_mem_region(ltq_pmu_resource.start, |
| 60 | resource_size(<q_pmu_resource), "pmu") < 0) |
| 61 | panic("Failed to request pmu memory\n"); |
| 62 | |
| 63 | ltq_pmu_membase = ioremap_nocache(ltq_pmu_resource.start, |
| 64 | resource_size(<q_pmu_resource)); |
| 65 | if (!ltq_pmu_membase) |
| 66 | panic("Failed to remap pmu memory\n"); |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | core_initcall(ltq_pmu_init); |