1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 *  linux/arch/arm/mach-integrator/core.c
 4 *
 5 *  Copyright (C) 2000-2003 Deep Blue Solutions Ltd
 6 */
 7#include <linux/types.h>
 8#include <linux/kernel.h>
 9#include <linux/init.h>
10#include <linux/device.h>
11#include <linux/export.h>
12#include <linux/spinlock.h>
13#include <linux/interrupt.h>
14#include <linux/irq.h>
15#include <linux/memblock.h>
16#include <linux/sched.h>
17#include <linux/smp.h>
18#include <linux/amba/bus.h>
19#include <linux/amba/serial.h>
20#include <linux/io.h>
21#include <linux/stat.h>
22#include <linux/of.h>
23#include <linux/of_address.h>
24#include <linux/pgtable.h>
25
26#include <asm/mach-types.h>
27#include <asm/mach/time.h>
28
29#include "hardware.h"
30#include "cm.h"
31#include "common.h"
32
33static DEFINE_RAW_SPINLOCK(cm_lock);
34static void __iomem *cm_base;
35
36/**
37 * cm_get - get the value from the CM_CTRL register
38 */
39u32 cm_get(void)
40{
41	return readl(cm_base + INTEGRATOR_HDR_CTRL_OFFSET);
42}
43
44/**
45 * cm_control - update the CM_CTRL register.
46 * @mask: bits to change
47 * @set: bits to set
48 */
49void cm_control(u32 mask, u32 set)
50{
51	unsigned long flags;
52	u32 val;
53
54	raw_spin_lock_irqsave(&cm_lock, flags);
55	val = readl(cm_base + INTEGRATOR_HDR_CTRL_OFFSET) & ~mask;
56	writel(val | set, cm_base + INTEGRATOR_HDR_CTRL_OFFSET);
57	raw_spin_unlock_irqrestore(&cm_lock, flags);
58}
59
60void cm_clear_irqs(void)
61{
62	/* disable core module IRQs */
63	writel(0xffffffffU, cm_base + INTEGRATOR_HDR_IC_OFFSET +
64		IRQ_ENABLE_CLEAR);
65}
66
67static const struct of_device_id cm_match[] = {
68	{ .compatible = "arm,core-module-integrator"},
69	{ },
70};
71
72void cm_init(void)
73{
74	struct device_node *cm = of_find_matching_node(NULL, cm_match);
75
76	if (!cm) {
77		pr_crit("no core module node found in device tree\n");
78		return;
79	}
80	cm_base = of_iomap(cm, 0);
81	if (!cm_base) {
82		pr_crit("could not remap core module\n");
83		return;
84	}
85	cm_clear_irqs();
86}
87
88/*
89 * We need to stop things allocating the low memory; ideally we need a
90 * better implementation of GFP_DMA which does not assume that DMA-able
91 * memory starts at zero.
92 */
93void __init integrator_reserve(void)
94{
95	memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET);
96}