1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 1999,2000 Arm Limited
4 * Copyright (C) 2000 Deep Blue Solutions Ltd
5 * Copyright (C) 2002 Shane Nay (shane@minirl.com)
6 * Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
7 * - add MX31 specific definitions
8 */
9
10#include <linux/mm.h>
11#include <linux/init.h>
12#include <linux/err.h>
13#include <linux/io.h>
14#include <linux/of_address.h>
15
16#include <asm/system_misc.h>
17#include <asm/hardware/cache-l2x0.h>
18#include <asm/mach/map.h>
19
20#include "common.h"
21#include "crmregs-imx3.h"
22#include "hardware.h"
23
24void __iomem *mx3_ccm_base;
25
26static void imx3_idle(void)
27{
28 unsigned long reg = 0;
29
30 __asm__ __volatile__(
31 /* disable I and D cache */
32 "mrc p15, 0, %0, c1, c0, 0\n"
33 "bic %0, %0, #0x00001000\n"
34 "bic %0, %0, #0x00000004\n"
35 "mcr p15, 0, %0, c1, c0, 0\n"
36 /* invalidate I cache */
37 "mov %0, #0\n"
38 "mcr p15, 0, %0, c7, c5, 0\n"
39 /* clear and invalidate D cache */
40 "mov %0, #0\n"
41 "mcr p15, 0, %0, c7, c14, 0\n"
42 /* WFI */
43 "mov %0, #0\n"
44 "mcr p15, 0, %0, c7, c0, 4\n"
45 "nop\n" "nop\n" "nop\n" "nop\n"
46 "nop\n" "nop\n" "nop\n"
47 /* enable I and D cache */
48 "mrc p15, 0, %0, c1, c0, 0\n"
49 "orr %0, %0, #0x00001000\n"
50 "orr %0, %0, #0x00000004\n"
51 "mcr p15, 0, %0, c1, c0, 0\n"
52 : "=r" (reg));
53}
54
55static void __iomem *imx3_ioremap_caller(phys_addr_t phys_addr, size_t size,
56 unsigned int mtype, void *caller)
57{
58 if (mtype == MT_DEVICE) {
59 /*
60 * Access all peripherals below 0x80000000 as nonshared device
61 * on mx3, but leave l2cc alone. Otherwise cache corruptions
62 * can occur.
63 */
64 if (phys_addr < 0x80000000 &&
65 !addr_in_module(phys_addr, MX3x_L2CC))
66 mtype = MT_DEVICE_NONSHARED;
67 }
68
69 return __arm_ioremap_caller(phys_addr, size, mtype, caller);
70}
71
72#ifdef CONFIG_SOC_IMX31
73static struct map_desc mx31_io_desc[] __initdata = {
74 imx_map_entry(MX31, X_MEMC, MT_DEVICE),
75 imx_map_entry(MX31, AVIC, MT_DEVICE_NONSHARED),
76 imx_map_entry(MX31, AIPS1, MT_DEVICE_NONSHARED),
77 imx_map_entry(MX31, AIPS2, MT_DEVICE_NONSHARED),
78 imx_map_entry(MX31, SPBA0, MT_DEVICE_NONSHARED),
79};
80
81/*
82 * This function initializes the memory map. It is called during the
83 * system startup to create static physical to virtual memory mappings
84 * for the IO modules.
85 */
86void __init mx31_map_io(void)
87{
88 iotable_init(mx31_io_desc, ARRAY_SIZE(mx31_io_desc));
89}
90
91static void imx31_idle(void)
92{
93 int reg = imx_readl(mx3_ccm_base + MXC_CCM_CCMR);
94 reg &= ~MXC_CCM_CCMR_LPM_MASK;
95 imx_writel(reg, mx3_ccm_base + MXC_CCM_CCMR);
96
97 imx3_idle();
98}
99
100void __init imx31_init_early(void)
101{
102 struct device_node *np;
103
104 mxc_set_cpu_type(MXC_CPU_MX31);
105 arch_ioremap_caller = imx3_ioremap_caller;
106 arm_pm_idle = imx31_idle;
107 np = of_find_compatible_node(NULL, NULL, "fsl,imx31-ccm");
108 mx3_ccm_base = of_iomap(np, 0);
109 BUG_ON(!mx3_ccm_base);
110}
111#endif /* ifdef CONFIG_SOC_IMX31 */
112
113#ifdef CONFIG_SOC_IMX35
114static struct map_desc mx35_io_desc[] __initdata = {
115 imx_map_entry(MX35, X_MEMC, MT_DEVICE),
116 imx_map_entry(MX35, AVIC, MT_DEVICE_NONSHARED),
117 imx_map_entry(MX35, AIPS1, MT_DEVICE_NONSHARED),
118 imx_map_entry(MX35, AIPS2, MT_DEVICE_NONSHARED),
119 imx_map_entry(MX35, SPBA0, MT_DEVICE_NONSHARED),
120};
121
122void __init mx35_map_io(void)
123{
124 iotable_init(mx35_io_desc, ARRAY_SIZE(mx35_io_desc));
125}
126
127static void imx35_idle(void)
128{
129 int reg = imx_readl(mx3_ccm_base + MXC_CCM_CCMR);
130 reg &= ~MXC_CCM_CCMR_LPM_MASK;
131 reg |= MXC_CCM_CCMR_LPM_WAIT_MX35;
132 imx_writel(reg, mx3_ccm_base + MXC_CCM_CCMR);
133
134 imx3_idle();
135}
136
137void __init imx35_init_early(void)
138{
139 struct device_node *np;
140
141 mxc_set_cpu_type(MXC_CPU_MX35);
142 arm_pm_idle = imx35_idle;
143 arch_ioremap_caller = imx3_ioremap_caller;
144 np = of_find_compatible_node(NULL, NULL, "fsl,imx35-ccm");
145 mx3_ccm_base = of_iomap(np, 0);
146 BUG_ON(!mx3_ccm_base);
147}
148#endif /* ifdef CONFIG_SOC_IMX35 */
149

source code of linux/arch/arm/mach-imx/mm-imx3.c