Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mach-integrator/core.c |
| 3 | * |
| 4 | * Copyright (C) 2000-2003 Deep Blue Solutions Ltd |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2, as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | #include <linux/types.h> |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/device.h> |
Arnd Bergmann | b434f5c | 2012-08-04 10:31:24 +0000 | [diff] [blame] | 14 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/spinlock.h> |
| 16 | #include <linux/interrupt.h> |
Thomas Gleixner | a03d4d2 | 2006-07-01 22:32:32 +0100 | [diff] [blame] | 17 | #include <linux/irq.h> |
Russell King | 8d717a5 | 2010-05-22 19:47:18 +0100 | [diff] [blame] | 18 | #include <linux/memblock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/sched.h> |
Russell King | 20cf33e | 2005-06-18 10:15:46 +0100 | [diff] [blame] | 20 | #include <linux/smp.h> |
Russell King | a62c80e | 2006-01-07 13:52:45 +0000 | [diff] [blame] | 21 | #include <linux/amba/bus.h> |
Russell King | fbb18a2 | 2006-03-26 23:13:39 +0100 | [diff] [blame] | 22 | #include <linux/amba/serial.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 23 | #include <linux/io.h> |
Linus Walleij | e67ae6b | 2012-11-02 01:31:10 +0100 | [diff] [blame] | 24 | #include <linux/stat.h> |
Linus Walleij | bb4dbef | 2013-06-16 02:44:27 +0200 | [diff] [blame] | 25 | #include <linux/of.h> |
| 26 | #include <linux/of_address.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Linus Walleij | ee35887 | 2011-12-20 11:55:19 +0100 | [diff] [blame] | 28 | #include <asm/mach-types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <asm/mach/time.h> |
Russell King | 98c672c | 2010-05-22 18:18:57 +0100 | [diff] [blame] | 30 | #include <asm/pgtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
Linus Walleij | 1b1ef75 | 2014-02-13 21:26:24 +0100 | [diff] [blame] | 32 | #include "hardware.h" |
Linus Walleij | bb4dbef | 2013-06-16 02:44:27 +0200 | [diff] [blame] | 33 | #include "cm.h" |
Linus Walleij | 4672cdd | 2012-09-06 09:08:47 +0100 | [diff] [blame] | 34 | #include "common.h" |
| 35 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 36 | static DEFINE_RAW_SPINLOCK(cm_lock); |
Linus Walleij | bb4dbef | 2013-06-16 02:44:27 +0200 | [diff] [blame] | 37 | static void __iomem *cm_base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | /** |
Linus Walleij | fb61f86 | 2013-10-10 14:11:18 +0200 | [diff] [blame] | 40 | * cm_get - get the value from the CM_CTRL register |
| 41 | */ |
| 42 | u32 cm_get(void) |
| 43 | { |
| 44 | return readl(cm_base + INTEGRATOR_HDR_CTRL_OFFSET); |
| 45 | } |
| 46 | |
| 47 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | * cm_control - update the CM_CTRL register. |
| 49 | * @mask: bits to change |
| 50 | * @set: bits to set |
| 51 | */ |
| 52 | void cm_control(u32 mask, u32 set) |
| 53 | { |
| 54 | unsigned long flags; |
| 55 | u32 val; |
| 56 | |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 57 | raw_spin_lock_irqsave(&cm_lock, flags); |
Linus Walleij | bb4dbef | 2013-06-16 02:44:27 +0200 | [diff] [blame] | 58 | val = readl(cm_base + INTEGRATOR_HDR_CTRL_OFFSET) & ~mask; |
| 59 | writel(val | set, cm_base + INTEGRATOR_HDR_CTRL_OFFSET); |
Thomas Gleixner | bd31b85 | 2009-07-03 08:44:46 -0500 | [diff] [blame] | 60 | raw_spin_unlock_irqrestore(&cm_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
| 62 | |
Linus Walleij | bb4dbef | 2013-06-16 02:44:27 +0200 | [diff] [blame] | 63 | void cm_clear_irqs(void) |
| 64 | { |
| 65 | /* disable core module IRQs */ |
| 66 | writel(0xffffffffU, cm_base + INTEGRATOR_HDR_IC_OFFSET + |
| 67 | IRQ_ENABLE_CLEAR); |
| 68 | } |
| 69 | |
| 70 | static const struct of_device_id cm_match[] = { |
| 71 | { .compatible = "arm,core-module-integrator"}, |
| 72 | { }, |
| 73 | }; |
| 74 | |
| 75 | void cm_init(void) |
| 76 | { |
| 77 | struct device_node *cm = of_find_matching_node(NULL, cm_match); |
Linus Walleij | bb4dbef | 2013-06-16 02:44:27 +0200 | [diff] [blame] | 78 | |
| 79 | if (!cm) { |
| 80 | pr_crit("no core module node found in device tree\n"); |
| 81 | return; |
| 82 | } |
| 83 | cm_base = of_iomap(cm, 0); |
| 84 | if (!cm_base) { |
| 85 | pr_crit("could not remap core module\n"); |
| 86 | return; |
| 87 | } |
| 88 | cm_clear_irqs(); |
Linus Walleij | bb4dbef | 2013-06-16 02:44:27 +0200 | [diff] [blame] | 89 | } |
Russell King | 98c672c | 2010-05-22 18:18:57 +0100 | [diff] [blame] | 90 | |
| 91 | /* |
| 92 | * We need to stop things allocating the low memory; ideally we need a |
| 93 | * better implementation of GFP_DMA which does not assume that DMA-able |
| 94 | * memory starts at zero. |
| 95 | */ |
| 96 | void __init integrator_reserve(void) |
| 97 | { |
Russell King | 8d717a5 | 2010-05-22 19:47:18 +0100 | [diff] [blame] | 98 | memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET); |
Russell King | 98c672c | 2010-05-22 18:18:57 +0100 | [diff] [blame] | 99 | } |