aboutsummaryrefslogtreecommitdiff
path: root/drivers/amba/tegra-ahb.c
blob: 0b2c20fddb7c5851e373b901a1330cedf43a93bd (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
 * Copyright (C) 2011 Google, Inc.
 *
 * Author:
 *	Jay Cheng <jacheng@nvidia.com>
 *	James Wylder <james.wylder@motorola.com>
 *	Benoit Goby <benoit@android.com>
 *	Colin Cross <ccross@android.com>
 *	Hiroshi DOYU <hdoyu@nvidia.com>
 */

#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/of.h>

#include <soc/tegra/ahb.h>

#define DRV_NAME "tegra-ahb"

#define AHB_ARBITRATION_DISABLE		0x04
#define AHB_ARBITRATION_PRIORITY_CTRL	0x08
#define   AHB_PRIORITY_WEIGHT(x)	(((x) & 0x7) << 29)
#define   PRIORITY_SELECT_USB BIT(6)
#define   PRIORITY_SELECT_USB2 BIT(18)
#define   PRIORITY_SELECT_USB3 BIT(17)

#define AHB_GIZMO_AHB_MEM		0x10
#define   ENB_FAST_REARBITRATE BIT(2)
#define   DONT_SPLIT_AHB_WR     BIT(7)

#define AHB_GIZMO_APB_DMA		0x14
#define AHB_GIZMO_IDE			0x1c
#define AHB_GIZMO_USB			0x20
#define AHB_GIZMO_AHB_XBAR_BRIDGE	0x24
#define AHB_GIZMO_CPU_AHB_BRIDGE	0x28
#define AHB_GIZMO_COP_AHB_BRIDGE	0x2c
#define AHB_GIZMO_XBAR_APB_CTLR		0x30
#define AHB_GIZMO_VCP_AHB_BRIDGE	0x34
#define AHB_GIZMO_NAND			0x40
#define AHB_GIZMO_SDMMC4		0x48
#define AHB_GIZMO_XIO			0x4c
#define AHB_GIZMO_BSEV			0x64
#define AHB_GIZMO_BSEA			0x74
#define AHB_GIZMO_NOR			0x78
#define AHB_GIZMO_USB2			0x7c
#define AHB_GIZMO_USB3			0x80
#define   IMMEDIATE	BIT(18)

#define AHB_GIZMO_SDMMC1		0x84
#define AHB_GIZMO_SDMMC2		0x88
#define AHB_GIZMO_SDMMC3		0x8c
#define AHB_MEM_PREFETCH_CFG_X		0xdc
#define AHB_ARBITRATION_XBAR_CTRL	0xe0
#define AHB_MEM_PREFETCH_CFG3		0xe4
#define AHB_MEM_PREFETCH_CFG4		0xe8
#define AHB_MEM_PREFETCH_CFG1		0xf0
#define AHB_MEM_PREFETCH_CFG2		0xf4
#define   PREFETCH_ENB	BIT(31)
#define   MST_ID(x)	(((x) & 0x1f) << 26)
#define   AHBDMA_MST_ID	MST_ID(5)
#define   USB_MST_ID	MST_ID(6)
#define   USB2_MST_ID	MST_ID(18)
#define   USB3_MST_ID	MST_ID(17)
#define   ADDR_BNDRY(x)	(((x) & 0xf) << 21)
#define   INACTIVITY_TIMEOUT(x)	(((x) & 0xffff) << 0)

#define AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID	0xfc

#define AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE BIT(17)

/*
 * INCORRECT_BASE_ADDR_LOW_BYTE: Legacy kernel DT files for Tegra SoCs
 * prior to Tegra124 generally use a physical base address ending in
 * 0x4 for the AHB IP block.  According to the TRM, the low byte
 * should be 0x0.  During device probing, this macro is used to detect
 * whether the passed-in physical address is incorrect, and if so, to
 * correct it.
 */
#define INCORRECT_BASE_ADDR_LOW_BYTE		0x4

static struct platform_driver tegra_ahb_driver;

static const u32 tegra_ahb_gizmo[] = {
	AHB_ARBITRATION_DISABLE,
	AHB_ARBITRATION_PRIORITY_CTRL,
	AHB_GIZMO_AHB_MEM,
	AHB_GIZMO_APB_DMA,
	AHB_GIZMO_IDE,
	AHB_GIZMO_USB,
	AHB_GIZMO_AHB_XBAR_BRIDGE,
	AHB_GIZMO_CPU_AHB_BRIDGE,
	AHB_GIZMO_COP_AHB_BRIDGE,
	AHB_GIZMO_XBAR_APB_CTLR,
	AHB_GIZMO_VCP_AHB_BRIDGE,
	AHB_GIZMO_NAND,
	AHB_GIZMO_SDMMC4,
	AHB_GIZMO_XIO,
	AHB_GIZMO_BSEV,
	AHB_GIZMO_BSEA,
	AHB_GIZMO_NOR,
	AHB_GIZMO_USB2,
	AHB_GIZMO_USB3,
	AHB_GIZMO_SDMMC1,
	AHB_GIZMO_SDMMC2,
	AHB_GIZMO_SDMMC3,
	AHB_MEM_PREFETCH_CFG_X,
	AHB_ARBITRATION_XBAR_CTRL,
	AHB_MEM_PREFETCH_CFG3,
	AHB_MEM_PREFETCH_CFG4,
	AHB_MEM_PREFETCH_CFG1,
	AHB_MEM_PREFETCH_CFG2,
	AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID,
};

struct tegra_ahb {
	void __iomem	*regs;
	struct device	*dev;
	u32		ctx[];
};

static inline u32 gizmo_readl(struct tegra_ahb *ahb, u32 offset)
{
	return readl(ahb->regs + offset);
}

static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
{
	writel(value, ahb->regs + offset);
}

#ifdef CONFIG_TEGRA_IOMMU_SMMU
int tegra_ahb_enable_smmu(struct device_node *dn)
{
	struct device *dev;
	u32 val;
	struct tegra_ahb *ahb;

	dev = driver_find_device_by_of_node(&tegra_ahb_driver.driver, dn);
	if (!dev)
		return -EPROBE_DEFER;
	ahb = dev_get_drvdata(dev);
	val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
	val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
	gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
	return 0;
}
EXPORT_SYMBOL(tegra_ahb_enable_smmu);
#endif

static int __maybe_unused tegra_ahb_suspend(struct device *dev)
{
	int i;
	struct tegra_ahb *ahb = dev_get_drvdata(dev);

	for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
		ahb->ctx[i] = gizmo_readl(ahb, tegra_ahb_gizmo[i]);
	return 0;
}

static int __maybe_unused tegra_ahb_resume(struct device *dev)
{
	int i;
	struct tegra_ahb *ahb = dev_get_drvdata(dev);

	for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
		gizmo_writel(ahb, ahb->ctx[i], tegra_ahb_gizmo[i]);
	return 0;
}

static UNIVERSAL_DEV_PM_OPS(tegra_ahb_pm,
			    tegra_ahb_suspend,
			    tegra_ahb_resume, NULL);

static void tegra_ahb_gizmo_init(struct tegra_ahb *ahb)
{
	u32 val;

	val = gizmo_readl(ahb, AHB_GIZMO_AHB_MEM);
	val |= ENB_FAST_REARBITRATE | IMMEDIATE | DONT_SPLIT_AHB_WR;
	gizmo_writel(ahb, val, AHB_GIZMO_AHB_MEM);

	val = gizmo_readl(ahb, AHB_GIZMO_USB);
	val |= IMMEDIATE;
	gizmo_writel(ahb, val, AHB_GIZMO_USB);

	val = gizmo_readl(ahb, AHB_GIZMO_USB2);
	val |= IMMEDIATE;
	gizmo_writel(ahb, val, AHB_GIZMO_USB2);

	val = gizmo_readl(ahb, AHB_GIZMO_USB3);
	val |= IMMEDIATE;
	gizmo_writel(ahb, val, AHB_GIZMO_USB3);

	val = gizmo_readl(ahb, AHB_ARBITRATION_PRIORITY_CTRL);
	val |= PRIORITY_SELECT_USB |
		PRIORITY_SELECT_USB2 |
		PRIORITY_SELECT_USB3 |
		AHB_PRIORITY_WEIGHT(7);
	gizmo_writel(ahb, val, AHB_ARBITRATION_PRIORITY_CTRL);

	val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG1);
	val &= ~MST_ID(~0);
	val |= PREFETCH_ENB |
		AHBDMA_MST_ID |
		ADDR_BNDRY(0xc) |
		INACTIVITY_TIMEOUT(0x1000);
	gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG1);

	val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG2);
	val &= ~MST_ID(~0);
	val |= PREFETCH_ENB |
		USB_MST_ID |
		ADDR_BNDRY(0xc) |
		INACTIVITY_TIMEOUT(0x1000);
	gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG2);

	val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG3);
	val &= ~MST_ID(~0);
	val |= PREFETCH_ENB |
		USB3_MST_ID |
		ADDR_BNDRY(0xc) |
		INACTIVITY_TIMEOUT(0x1000);
	gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG3);

	val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG4);
	val &= ~MST_ID(~0);
	val |= PREFETCH_ENB |
		USB2_MST_ID |
		ADDR_BNDRY(0xc) |
		INACTIVITY_TIMEOUT(0x1000);
	gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG4);
}

static int tegra_ahb_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct tegra_ahb *ahb;
	size_t bytes;

	bytes = sizeof(*ahb) + sizeof(u32) * ARRAY_SIZE(tegra_ahb_gizmo);
	ahb = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL);
	if (!ahb)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	/* Correct the IP block base address if necessary */
	if (res &&
	    (res->start & INCORRECT_BASE_ADDR_LOW_BYTE) ==
	    INCORRECT_BASE_ADDR_LOW_BYTE) {
		dev_warn(&pdev->dev, "incorrect AHB base address in DT data - enabling workaround\n");
		res->start -= INCORRECT_BASE_ADDR_LOW_BYTE;
	}

	ahb->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(ahb->regs))
		return PTR_ERR(ahb->regs);

	ahb->dev = &pdev->dev;
	platform_set_drvdata(pdev, ahb);
	tegra_ahb_gizmo_init(ahb);
	return 0;
}

static const struct of_device_id tegra_ahb_of_match[] = {
	{ .compatible = "nvidia,tegra30-ahb", },
	{ .compatible = "nvidia,tegra20-ahb", },
	{},
};

static struct platform_driver tegra_ahb_driver = {
	.probe = tegra_ahb_probe,
	.driver = {
		.name = DRV_NAME,
		.of_match_table = tegra_ahb_of_match,
		.pm = &tegra_ahb_pm,
	},
};
module_platform_driver(tegra_ahb_driver);

MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
MODULE_DESCRIPTION("Tegra AHB driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRV_NAME);