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>
14 #include <linux/export.h>
15 #include <linux/spinlock.h>
16 #include <linux/interrupt.h>
17 #include <linux/irq.h>
18 #include <linux/memblock.h>
19 #include <linux/sched.h>
20 #include <linux/smp.h>
21 #include <linux/amba/bus.h>
22 #include <linux/amba/serial.h>
23 #include <linux/io.h>
24 #include <linux/stat.h>
25 #include <linux/of.h>
26 #include <linux/of_address.h>
27
28 #include <asm/mach-types.h>
29 #include <asm/mach/time.h>
30 #include <asm/pgtable.h>
31
32 #include "hardware.h"
33 #include "cm.h"
34 #include "common.h"
35
36 static DEFINE_RAW_SPINLOCK(cm_lock);
37 static void __iomem *cm_base;
38
39 /**
40 * cm_get - get the value from the CM_CTRL register
41 */
cm_get(void)42 u32 cm_get(void)
43 {
44 return readl(cm_base + INTEGRATOR_HDR_CTRL_OFFSET);
45 }
46
47 /**
48 * cm_control - update the CM_CTRL register.
49 * @mask: bits to change
50 * @set: bits to set
51 */
cm_control(u32 mask,u32 set)52 void cm_control(u32 mask, u32 set)
53 {
54 unsigned long flags;
55 u32 val;
56
57 raw_spin_lock_irqsave(&cm_lock, flags);
58 val = readl(cm_base + INTEGRATOR_HDR_CTRL_OFFSET) & ~mask;
59 writel(val | set, cm_base + INTEGRATOR_HDR_CTRL_OFFSET);
60 raw_spin_unlock_irqrestore(&cm_lock, flags);
61 }
62
cm_clear_irqs(void)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
cm_init(void)75 void cm_init(void)
76 {
77 struct device_node *cm = of_find_matching_node(NULL, cm_match);
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();
89 }
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 */
integrator_reserve(void)96 void __init integrator_reserve(void)
97 {
98 memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET);
99 }
100