summaryrefslogtreecommitdiff
path: root/arch/arm/mach-shmobile/setup-rcar-gen2.c
blob: 1ee5cd2840e0ec8b2f0745cac2df082894d7c089 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
// SPDX-License-Identifier: GPL-2.0
/*
 * R-Car Generation 2 support
 *
 * Copyright (C) 2013  Renesas Solutions Corp.
 * Copyright (C) 2013  Magnus Damm
 * Copyright (C) 2014  Ulrich Hecht
 */

#include <linux/clocksource.h>
#include <linux/device.h>
#include <linux/dma-contiguous.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/memblock.h>
#include <linux/of.h>
#include <linux/of_clk.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/psci.h>
#include <asm/mach/arch.h>
#include <asm/secure_cntvoff.h>
#include "common.h"
#include "rcar-gen2.h"

static const struct of_device_id cpg_matches[] __initconst = {
	{ .compatible = "renesas,r8a7743-cpg-mssr", .data = "extal" },
	{ .compatible = "renesas,r8a7744-cpg-mssr", .data = "extal" },
	{ .compatible = "renesas,r8a7790-cpg-mssr", .data = "extal" },
	{ .compatible = "renesas,r8a7791-cpg-mssr", .data = "extal" },
	{ .compatible = "renesas,r8a7793-cpg-mssr", .data = "extal" },
	{ /* sentinel */ }
};

static unsigned int __init get_extal_freq(void)
{
	const struct of_device_id *match;
	struct device_node *cpg, *extal;
	u32 freq = 20000000;
	int idx = 0;

	cpg = of_find_matching_node_and_match(NULL, cpg_matches, &match);
	if (!cpg)
		return freq;

	if (match->data)
		idx = of_property_match_string(cpg, "clock-names", match->data);
	extal = of_parse_phandle(cpg, "clocks", idx);
	of_node_put(cpg);
	if (!extal)
		return freq;

	of_property_read_u32(extal, "clock-frequency", &freq);
	of_node_put(extal);
	return freq;
}

#define CNTCR 0
#define CNTFID0 0x20

void __init rcar_gen2_timer_init(void)
{
	bool need_update = true;
	void __iomem *base;
	u32 freq;

	/*
	 * If PSCI is available then most likely we are running on PSCI-enabled
	 * U-Boot which, we assume, has already taken care of resetting CNTVOFF
	 * and updating counter module before switching to non-secure mode
	 * and we don't need to.
	 */
#ifdef CONFIG_ARM_PSCI_FW
	if (psci_ops.cpu_on)
		need_update = false;
#endif

	if (need_update == false)
		goto skip_update;

	secure_cntvoff_init();

	if (of_machine_is_compatible("renesas,r8a7745") ||
	    of_machine_is_compatible("renesas,r8a77470") ||
	    of_machine_is_compatible("renesas,r8a7792") ||
	    of_machine_is_compatible("renesas,r8a7794")) {
		freq = 260000000 / 8;	/* ZS / 8 */
	} else {
		/* At Linux boot time the r8a7790 arch timer comes up
		 * with the counter disabled. Moreover, it may also report
		 * a potentially incorrect fixed 13 MHz frequency. To be
		 * correct these registers need to be updated to use the
		 * frequency EXTAL / 2.
		 */
		freq = get_extal_freq() / 2;
	}

	/* Remap "armgcnt address map" space */
	base = ioremap(0xe6080000, PAGE_SIZE);

	/*
	 * Update the timer if it is either not running, or is not at the
	 * right frequency. The timer is only configurable in secure mode
	 * so this avoids an abort if the loader started the timer and
	 * entered the kernel in non-secure mode.
	 */

	if ((ioread32(base + CNTCR) & 1) == 0 ||
	    ioread32(base + CNTFID0) != freq) {
		/* Update registers with correct frequency */
		iowrite32(freq, base + CNTFID0);
		asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));

		/* make sure arch timer is started by setting bit 0 of CNTCR */
		iowrite32(1, base + CNTCR);
	}

	iounmap(base);

skip_update:
	of_clk_init(NULL);
	timer_probe();
}

struct memory_reserve_config {
	u64 reserved;
	u64 base, size;
};

static int __init rcar_gen2_scan_mem(unsigned long node, const char *uname,
				     int depth, void *data)
{
	const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
	const __be32 *reg, *endp;
	int l;
	struct memory_reserve_config *mrc = data;
	u64 lpae_start = 1ULL << 32;

	/* We are scanning "memory" nodes only */
	if (type == NULL || strcmp(type, "memory"))
		return 0;

	reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
	if (reg == NULL)
		reg = of_get_flat_dt_prop(node, "reg", &l);
	if (reg == NULL)
		return 0;

	endp = reg + (l / sizeof(__be32));
	while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
		u64 base, size;

		base = dt_mem_next_cell(dt_root_addr_cells, &reg);
		size = dt_mem_next_cell(dt_root_size_cells, &reg);

		if (base >= lpae_start)
			continue;

		if ((base + size) >= lpae_start)
			size = lpae_start - base;

		if (size < mrc->reserved)
			continue;

		if (base < mrc->base)
			continue;

		/* keep the area at top near the 32-bit legacy limit */
		mrc->base = base + size - mrc->reserved;
		mrc->size = mrc->reserved;
	}

	return 0;
}

void __init rcar_gen2_reserve(void)
{
	struct memory_reserve_config mrc;

	/* reserve 256 MiB at the top of the physical legacy 32-bit space */
	memset(&mrc, 0, sizeof(mrc));
	mrc.reserved = SZ_256M;

	of_scan_flat_dt(rcar_gen2_scan_mem, &mrc);
#ifdef CONFIG_DMA_CMA
	if (mrc.size && memblock_is_region_memory(mrc.base, mrc.size)) {
		static struct cma *rcar_gen2_dma_contiguous;

		dma_contiguous_reserve_area(mrc.size, mrc.base, 0,
					    &rcar_gen2_dma_contiguous, true);
	}
#endif
}

static const char * const rcar_gen2_boards_compat_dt[] __initconst = {
	"renesas,r8a7790",
	"renesas,r8a7791",
	"renesas,r8a7792",
	"renesas,r8a7793",
	"renesas,r8a7794",
	NULL,
};

DT_MACHINE_START(RCAR_GEN2_DT, "Generic R-Car Gen2 (Flattened Device Tree)")
	.init_late	= shmobile_init_late,
	.init_time	= rcar_gen2_timer_init,
	.reserve	= rcar_gen2_reserve,
	.dt_compat	= rcar_gen2_boards_compat_dt,
MACHINE_END

static const char * const rz_g1_boards_compat_dt[] __initconst = {
	"renesas,r8a7743",
	"renesas,r8a7744",
	"renesas,r8a7745",
	"renesas,r8a77470",
	NULL,
};

DT_MACHINE_START(RZ_G1_DT, "Generic RZ/G1 (Flattened Device Tree)")
	.init_late	= shmobile_init_late,
	.init_time	= rcar_gen2_timer_init,
	.reserve	= rcar_gen2_reserve,
	.dt_compat	= rz_g1_boards_compat_dt,
MACHINE_END