1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2000-2003 Deep Blue Solutions Ltd
4 */
5#include <linux/types.h>
6#include <linux/kernel.h>
7#include <linux/init.h>
8#include <linux/device.h>
9#include <linux/export.h>
10#include <linux/spinlock.h>
11#include <linux/interrupt.h>
12#include <linux/irq.h>
13#include <linux/memblock.h>
14#include <linux/sched.h>
15#include <linux/smp.h>
16#include <linux/amba/bus.h>
17#include <linux/amba/serial.h>
18#include <linux/io.h>
19#include <linux/stat.h>
20#include <linux/of.h>
21#include <linux/of_address.h>
22#include <linux/pgtable.h>
23
24#include <asm/mach-types.h>
25#include <asm/mach/time.h>
26
27#include "integrator-hardware.h"
28#include "integrator-cm.h"
29#include "integrator.h"
30
31static DEFINE_RAW_SPINLOCK(cm_lock);
32static void __iomem *cm_base;
33
34/**
35 * cm_get - get the value from the CM_CTRL register
36 */
37u32 cm_get(void)
38{
39 return readl(addr: cm_base + INTEGRATOR_HDR_CTRL_OFFSET);
40}
41
42/**
43 * cm_control - update the CM_CTRL register.
44 * @mask: bits to change
45 * @set: bits to set
46 */
47void cm_control(u32 mask, u32 set)
48{
49 unsigned long flags;
50 u32 val;
51
52 raw_spin_lock_irqsave(&cm_lock, flags);
53 val = readl(addr: cm_base + INTEGRATOR_HDR_CTRL_OFFSET) & ~mask;
54 writel(val: val | set, addr: cm_base + INTEGRATOR_HDR_CTRL_OFFSET);
55 raw_spin_unlock_irqrestore(&cm_lock, flags);
56}
57
58void cm_clear_irqs(void)
59{
60 /* disable core module IRQs */
61 writel(val: 0xffffffffU, addr: cm_base + INTEGRATOR_HDR_IC_OFFSET +
62 IRQ_ENABLE_CLEAR);
63}
64
65static const struct of_device_id cm_match[] = {
66 { .compatible = "arm,core-module-integrator"},
67 { },
68};
69
70void cm_init(void)
71{
72 struct device_node *cm = of_find_matching_node(NULL, matches: cm_match);
73
74 if (!cm) {
75 pr_crit("no core module node found in device tree\n");
76 return;
77 }
78 cm_base = of_iomap(node: cm, index: 0);
79 if (!cm_base) {
80 pr_crit("could not remap core module\n");
81 return;
82 }
83 cm_clear_irqs();
84}
85
86/*
87 * We need to stop things allocating the low memory; ideally we need a
88 * better implementation of GFP_DMA which does not assume that DMA-able
89 * memory starts at zero.
90 */
91void __init integrator_reserve(void)
92{
93 memblock_reserve(base: PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET);
94}
95

source code of linux/arch/arm/mach-versatile/integrator.c