summaryrefslogtreecommitdiffstats
path: root/drivers/memory/tegra/mc.c
blob: fe3c44e7e1d1bf8268b1760fb8e9b828af4f3bc1 (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
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
/*
 * Copyright (C) 2014 NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include "mc.h"

#define MC_INTSTATUS 0x000
#define  MC_INT_DECERR_MTS (1 << 16)
#define  MC_INT_SECERR_SEC (1 << 13)
#define  MC_INT_DECERR_VPR (1 << 12)
#define  MC_INT_INVALID_APB_ASID_UPDATE (1 << 11)
#define  MC_INT_INVALID_SMMU_PAGE (1 << 10)
#define  MC_INT_ARBITRATION_EMEM (1 << 9)
#define  MC_INT_SECURITY_VIOLATION (1 << 8)
#define  MC_INT_DECERR_EMEM (1 << 6)

#define MC_INTMASK 0x004

#define MC_ERR_STATUS 0x08
#define  MC_ERR_STATUS_TYPE_SHIFT 28
#define  MC_ERR_STATUS_TYPE_INVALID_SMMU_PAGE (6 << MC_ERR_STATUS_TYPE_SHIFT)
#define  MC_ERR_STATUS_TYPE_MASK (0x7 << MC_ERR_STATUS_TYPE_SHIFT)
#define  MC_ERR_STATUS_READABLE (1 << 27)
#define  MC_ERR_STATUS_WRITABLE (1 << 26)
#define  MC_ERR_STATUS_NONSECURE (1 << 25)
#define  MC_ERR_STATUS_ADR_HI_SHIFT 20
#define  MC_ERR_STATUS_ADR_HI_MASK 0x3
#define  MC_ERR_STATUS_SECURITY (1 << 17)
#define  MC_ERR_STATUS_RW (1 << 16)
#define  MC_ERR_STATUS_CLIENT_MASK 0x7f

#define MC_ERR_ADR 0x0c

#define MC_EMEM_ARB_CFG 0x90
#define  MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE(x)	(((x) & 0x1ff) << 0)
#define  MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE_MASK	0x1ff
#define MC_EMEM_ARB_MISC0 0xd8

static const struct of_device_id tegra_mc_of_match[] = {
#ifdef CONFIG_ARCH_TEGRA_3x_SOC
	{ .compatible = "nvidia,tegra30-mc", .data = &tegra30_mc_soc },
#endif
#ifdef CONFIG_ARCH_TEGRA_114_SOC
	{ .compatible = "nvidia,tegra114-mc", .data = &tegra114_mc_soc },
#endif
#ifdef CONFIG_ARCH_TEGRA_124_SOC
	{ .compatible = "nvidia,tegra124-mc", .data = &tegra124_mc_soc },
#endif
	{ }
};
MODULE_DEVICE_TABLE(of, tegra_mc_of_match);

static int tegra_mc_setup_latency_allowance(struct tegra_mc *mc)
{
	unsigned long long tick;
	unsigned int i;
	u32 value;

	/* compute the number of MC clock cycles per tick */
	tick = mc->tick * clk_get_rate(mc->clk);
	do_div(tick, NSEC_PER_SEC);

	value = readl(mc->regs + MC_EMEM_ARB_CFG);
	value &= ~MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE_MASK;
	value |= MC_EMEM_ARB_CFG_CYCLES_PER_UPDATE(tick);
	writel(value, mc->regs + MC_EMEM_ARB_CFG);

	/* write latency allowance defaults */
	for (i = 0; i < mc->soc->num_clients; i++) {
		const struct tegra_mc_la *la = &mc->soc->clients[i].la;
		u32 value;

		value = readl(mc->regs + la->reg);
		value &= ~(la->mask << la->shift);
		value |= (la->def & la->mask) << la->shift;
		writel(value, mc->regs + la->reg);
	}

	return 0;
}

static const char *const status_names[32] = {
	[ 1] = "External interrupt",
	[ 6] = "EMEM address decode error",
	[ 8] = "Security violation",
	[ 9] = "EMEM arbitration error",
	[10] = "Page fault",
	[11] = "Invalid APB ASID update",
	[12] = "VPR violation",
	[13] = "Secure carveout violation",
	[16] = "MTS carveout violation",
};

static const char *const error_names[8] = {
	[2] = "EMEM decode error",
	[3] = "TrustZone violation",
	[4] = "Carveout violation",
	[6] = "SMMU translation error",
};

static irqreturn_t tegra_mc_irq(int irq, void *data)
{
	struct tegra_mc *mc = data;
	unsigned long status, mask;
	unsigned int bit;

	/* mask all interrupts to avoid flooding */
	status = mc_readl(mc, MC_INTSTATUS);
	mask = mc_readl(mc, MC_INTMASK);

	for_each_set_bit(bit, &status, 32) {
		const char *error = status_names[bit] ?: "unknown";
		const char *client = "unknown", *desc;
		const char *direction, *secure;
		phys_addr_t addr = 0;
		unsigned int i;
		char perm[7];
		u8 id, type;
		u32 value;

		value = mc_readl(mc, MC_ERR_STATUS);

#ifdef CONFIG_PHYS_ADDR_T_64BIT
		if (mc->soc->num_address_bits > 32) {
			addr = ((value >> MC_ERR_STATUS_ADR_HI_SHIFT) &
				MC_ERR_STATUS_ADR_HI_MASK);
			addr <<= 32;
		}
#endif

		if (value & MC_ERR_STATUS_RW)
			direction = "write";
		else
			direction = "read";

		if (value & MC_ERR_STATUS_SECURITY)
			secure = "secure ";
		else
			secure = "";

		id = value & MC_ERR_STATUS_CLIENT_MASK;

		for (i = 0; i < mc->soc->num_clients; i++) {
			if (mc->soc->clients[i].id == id) {
				client = mc->soc->clients[i].name;
				break;
			}
		}

		type = (value & MC_ERR_STATUS_TYPE_MASK) >>
		       MC_ERR_STATUS_TYPE_SHIFT;
		desc = error_names[type];

		switch (value & MC_ERR_STATUS_TYPE_MASK) {
		case MC_ERR_STATUS_TYPE_INVALID_SMMU_PAGE:
			perm[0] = ' ';
			perm[1] = '[';

			if (value & MC_ERR_STATUS_READABLE)
				perm[2] = 'R';
			else
				perm[2] = '-';

			if (value & MC_ERR_STATUS_WRITABLE)
				perm[3] = 'W';
			else
				perm[3] = '-';

			if (value & MC_ERR_STATUS_NONSECURE)
				perm[4] = '-';
			else
				perm[4] = 'S';

			perm[5] = ']';
			perm[6] = '\0';
			break;

		default:
			perm[0] = '\0';
			break;
		}

		value = mc_readl(mc, MC_ERR_ADR);
		addr |= value;

		dev_err_ratelimited(mc->dev, "%s: %s%s @%pa: %s (%s%s)\n",
				    client, secure, direction, &addr, error,
				    desc, perm);
	}

	/* clear interrupts */
	mc_writel(mc, status, MC_INTSTATUS);

	return IRQ_HANDLED;
}

static int tegra_mc_probe(struct platform_device *pdev)
{
	const struct of_device_id *match;
	struct resource *res;
	struct tegra_mc *mc;
	u32 value;
	int err;

	match = of_match_node(tegra_mc_of_match, pdev->dev.of_node);
	if (!match)
		return -ENODEV;

	mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
	if (!mc)
		return -ENOMEM;

	platform_set_drvdata(pdev, mc);
	mc->soc = match->data;
	mc->dev = &pdev->dev;

	/* length of MC tick in nanoseconds */
	mc->tick = 30;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	mc->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(mc->regs))
		return PTR_ERR(mc->regs);

	mc->clk = devm_clk_get(&pdev->dev, "mc");
	if (IS_ERR(mc->clk)) {
		dev_err(&pdev->dev, "failed to get MC clock: %ld\n",
			PTR_ERR(mc->clk));
		return PTR_ERR(mc->clk);
	}

	err = tegra_mc_setup_latency_allowance(mc);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to setup latency allowance: %d\n",
			err);
		return err;
	}

	if (IS_ENABLED(CONFIG_TEGRA_IOMMU_SMMU)) {
		mc->smmu = tegra_smmu_probe(&pdev->dev, mc->soc->smmu, mc);
		if (IS_ERR(mc->smmu)) {
			dev_err(&pdev->dev, "failed to probe SMMU: %ld\n",
				PTR_ERR(mc->smmu));
			return PTR_ERR(mc->smmu);
		}
	}

	mc->irq = platform_get_irq(pdev, 0);
	if (mc->irq < 0) {
		dev_err(&pdev->dev, "interrupt not specified\n");
		return mc->irq;
	}

	err = devm_request_irq(&pdev->dev, mc->irq, tegra_mc_irq, IRQF_SHARED,
			       dev_name(&pdev->dev), mc);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to request IRQ#%u: %d\n", mc->irq,
			err);
		return err;
	}

	value = MC_INT_DECERR_MTS | MC_INT_SECERR_SEC | MC_INT_DECERR_VPR |
		MC_INT_INVALID_APB_ASID_UPDATE | MC_INT_INVALID_SMMU_PAGE |
		MC_INT_ARBITRATION_EMEM | MC_INT_SECURITY_VIOLATION |
		MC_INT_DECERR_EMEM;
	mc_writel(mc, value, MC_INTMASK);

	return 0;
}

static struct platform_driver tegra_mc_driver = {
	.driver = {
		.name = "tegra-mc",
		.of_match_table = tegra_mc_of_match,
		.suppress_bind_attrs = true,
	},
	.prevent_deferred_probe = true,
	.probe = tegra_mc_probe,
};

static int tegra_mc_init(void)
{
	return platform_driver_register(&tegra_mc_driver);
}
arch_initcall(tegra_mc_init);

MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_DESCRIPTION("NVIDIA Tegra Memory Controller driver");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud