xref: /openbmc/linux/drivers/amba/tegra-ahb.c (revision 0ba3f797)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
4  * Copyright (C) 2011 Google, Inc.
5  *
6  * Author:
7  *	Jay Cheng <jacheng@nvidia.com>
8  *	James Wylder <james.wylder@motorola.com>
9  *	Benoit Goby <benoit@android.com>
10  *	Colin Cross <ccross@android.com>
11  *	Hiroshi DOYU <hdoyu@nvidia.com>
12  */
13 
14 #include <linux/err.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/io.h>
19 #include <linux/of.h>
20 
21 #include <soc/tegra/ahb.h>
22 
23 #define DRV_NAME "tegra-ahb"
24 
25 #define AHB_ARBITRATION_DISABLE		0x04
26 #define AHB_ARBITRATION_PRIORITY_CTRL	0x08
27 #define   AHB_PRIORITY_WEIGHT(x)	(((x) & 0x7) << 29)
28 #define   PRIORITY_SELECT_USB BIT(6)
29 #define   PRIORITY_SELECT_USB2 BIT(18)
30 #define   PRIORITY_SELECT_USB3 BIT(17)
31 
32 #define AHB_GIZMO_AHB_MEM		0x10
33 #define   ENB_FAST_REARBITRATE BIT(2)
34 #define   DONT_SPLIT_AHB_WR     BIT(7)
35 
36 #define AHB_GIZMO_APB_DMA		0x14
37 #define AHB_GIZMO_IDE			0x1c
38 #define AHB_GIZMO_USB			0x20
39 #define AHB_GIZMO_AHB_XBAR_BRIDGE	0x24
40 #define AHB_GIZMO_CPU_AHB_BRIDGE	0x28
41 #define AHB_GIZMO_COP_AHB_BRIDGE	0x2c
42 #define AHB_GIZMO_XBAR_APB_CTLR		0x30
43 #define AHB_GIZMO_VCP_AHB_BRIDGE	0x34
44 #define AHB_GIZMO_NAND			0x40
45 #define AHB_GIZMO_SDMMC4		0x48
46 #define AHB_GIZMO_XIO			0x4c
47 #define AHB_GIZMO_BSEV			0x64
48 #define AHB_GIZMO_BSEA			0x74
49 #define AHB_GIZMO_NOR			0x78
50 #define AHB_GIZMO_USB2			0x7c
51 #define AHB_GIZMO_USB3			0x80
52 #define   IMMEDIATE	BIT(18)
53 
54 #define AHB_GIZMO_SDMMC1		0x84
55 #define AHB_GIZMO_SDMMC2		0x88
56 #define AHB_GIZMO_SDMMC3		0x8c
57 #define AHB_MEM_PREFETCH_CFG_X		0xdc
58 #define AHB_ARBITRATION_XBAR_CTRL	0xe0
59 #define AHB_MEM_PREFETCH_CFG3		0xe4
60 #define AHB_MEM_PREFETCH_CFG4		0xe8
61 #define AHB_MEM_PREFETCH_CFG1		0xf0
62 #define AHB_MEM_PREFETCH_CFG2		0xf4
63 #define   PREFETCH_ENB	BIT(31)
64 #define   MST_ID(x)	(((x) & 0x1f) << 26)
65 #define   AHBDMA_MST_ID	MST_ID(5)
66 #define   USB_MST_ID	MST_ID(6)
67 #define   USB2_MST_ID	MST_ID(18)
68 #define   USB3_MST_ID	MST_ID(17)
69 #define   ADDR_BNDRY(x)	(((x) & 0xf) << 21)
70 #define   INACTIVITY_TIMEOUT(x)	(((x) & 0xffff) << 0)
71 
72 #define AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID	0xfc
73 
74 #define AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE BIT(17)
75 
76 /*
77  * INCORRECT_BASE_ADDR_LOW_BYTE: Legacy kernel DT files for Tegra SoCs
78  * prior to Tegra124 generally use a physical base address ending in
79  * 0x4 for the AHB IP block.  According to the TRM, the low byte
80  * should be 0x0.  During device probing, this macro is used to detect
81  * whether the passed-in physical address is incorrect, and if so, to
82  * correct it.
83  */
84 #define INCORRECT_BASE_ADDR_LOW_BYTE		0x4
85 
86 static struct platform_driver tegra_ahb_driver;
87 
88 static const u32 tegra_ahb_gizmo[] = {
89 	AHB_ARBITRATION_DISABLE,
90 	AHB_ARBITRATION_PRIORITY_CTRL,
91 	AHB_GIZMO_AHB_MEM,
92 	AHB_GIZMO_APB_DMA,
93 	AHB_GIZMO_IDE,
94 	AHB_GIZMO_USB,
95 	AHB_GIZMO_AHB_XBAR_BRIDGE,
96 	AHB_GIZMO_CPU_AHB_BRIDGE,
97 	AHB_GIZMO_COP_AHB_BRIDGE,
98 	AHB_GIZMO_XBAR_APB_CTLR,
99 	AHB_GIZMO_VCP_AHB_BRIDGE,
100 	AHB_GIZMO_NAND,
101 	AHB_GIZMO_SDMMC4,
102 	AHB_GIZMO_XIO,
103 	AHB_GIZMO_BSEV,
104 	AHB_GIZMO_BSEA,
105 	AHB_GIZMO_NOR,
106 	AHB_GIZMO_USB2,
107 	AHB_GIZMO_USB3,
108 	AHB_GIZMO_SDMMC1,
109 	AHB_GIZMO_SDMMC2,
110 	AHB_GIZMO_SDMMC3,
111 	AHB_MEM_PREFETCH_CFG_X,
112 	AHB_ARBITRATION_XBAR_CTRL,
113 	AHB_MEM_PREFETCH_CFG3,
114 	AHB_MEM_PREFETCH_CFG4,
115 	AHB_MEM_PREFETCH_CFG1,
116 	AHB_MEM_PREFETCH_CFG2,
117 	AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID,
118 };
119 
120 struct tegra_ahb {
121 	void __iomem	*regs;
122 	struct device	*dev;
123 	u32		ctx[];
124 };
125 
gizmo_readl(struct tegra_ahb * ahb,u32 offset)126 static inline u32 gizmo_readl(struct tegra_ahb *ahb, u32 offset)
127 {
128 	return readl(ahb->regs + offset);
129 }
130 
gizmo_writel(struct tegra_ahb * ahb,u32 value,u32 offset)131 static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
132 {
133 	writel(value, ahb->regs + offset);
134 }
135 
136 #ifdef CONFIG_TEGRA_IOMMU_SMMU
tegra_ahb_enable_smmu(struct device_node * dn)137 int tegra_ahb_enable_smmu(struct device_node *dn)
138 {
139 	struct device *dev;
140 	u32 val;
141 	struct tegra_ahb *ahb;
142 
143 	dev = driver_find_device_by_of_node(&tegra_ahb_driver.driver, dn);
144 	if (!dev)
145 		return -EPROBE_DEFER;
146 	ahb = dev_get_drvdata(dev);
147 	val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
148 	val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
149 	gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
150 	return 0;
151 }
152 EXPORT_SYMBOL(tegra_ahb_enable_smmu);
153 #endif
154 
tegra_ahb_suspend(struct device * dev)155 static int __maybe_unused tegra_ahb_suspend(struct device *dev)
156 {
157 	int i;
158 	struct tegra_ahb *ahb = dev_get_drvdata(dev);
159 
160 	for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
161 		ahb->ctx[i] = gizmo_readl(ahb, tegra_ahb_gizmo[i]);
162 	return 0;
163 }
164 
tegra_ahb_resume(struct device * dev)165 static int __maybe_unused tegra_ahb_resume(struct device *dev)
166 {
167 	int i;
168 	struct tegra_ahb *ahb = dev_get_drvdata(dev);
169 
170 	for (i = 0; i < ARRAY_SIZE(tegra_ahb_gizmo); i++)
171 		gizmo_writel(ahb, ahb->ctx[i], tegra_ahb_gizmo[i]);
172 	return 0;
173 }
174 
175 static UNIVERSAL_DEV_PM_OPS(tegra_ahb_pm,
176 			    tegra_ahb_suspend,
177 			    tegra_ahb_resume, NULL);
178 
tegra_ahb_gizmo_init(struct tegra_ahb * ahb)179 static void tegra_ahb_gizmo_init(struct tegra_ahb *ahb)
180 {
181 	u32 val;
182 
183 	val = gizmo_readl(ahb, AHB_GIZMO_AHB_MEM);
184 	val |= ENB_FAST_REARBITRATE | IMMEDIATE | DONT_SPLIT_AHB_WR;
185 	gizmo_writel(ahb, val, AHB_GIZMO_AHB_MEM);
186 
187 	val = gizmo_readl(ahb, AHB_GIZMO_USB);
188 	val |= IMMEDIATE;
189 	gizmo_writel(ahb, val, AHB_GIZMO_USB);
190 
191 	val = gizmo_readl(ahb, AHB_GIZMO_USB2);
192 	val |= IMMEDIATE;
193 	gizmo_writel(ahb, val, AHB_GIZMO_USB2);
194 
195 	val = gizmo_readl(ahb, AHB_GIZMO_USB3);
196 	val |= IMMEDIATE;
197 	gizmo_writel(ahb, val, AHB_GIZMO_USB3);
198 
199 	val = gizmo_readl(ahb, AHB_ARBITRATION_PRIORITY_CTRL);
200 	val |= PRIORITY_SELECT_USB |
201 		PRIORITY_SELECT_USB2 |
202 		PRIORITY_SELECT_USB3 |
203 		AHB_PRIORITY_WEIGHT(7);
204 	gizmo_writel(ahb, val, AHB_ARBITRATION_PRIORITY_CTRL);
205 
206 	val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG1);
207 	val &= ~MST_ID(~0);
208 	val |= PREFETCH_ENB |
209 		AHBDMA_MST_ID |
210 		ADDR_BNDRY(0xc) |
211 		INACTIVITY_TIMEOUT(0x1000);
212 	gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG1);
213 
214 	val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG2);
215 	val &= ~MST_ID(~0);
216 	val |= PREFETCH_ENB |
217 		USB_MST_ID |
218 		ADDR_BNDRY(0xc) |
219 		INACTIVITY_TIMEOUT(0x1000);
220 	gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG2);
221 
222 	val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG3);
223 	val &= ~MST_ID(~0);
224 	val |= PREFETCH_ENB |
225 		USB3_MST_ID |
226 		ADDR_BNDRY(0xc) |
227 		INACTIVITY_TIMEOUT(0x1000);
228 	gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG3);
229 
230 	val = gizmo_readl(ahb, AHB_MEM_PREFETCH_CFG4);
231 	val &= ~MST_ID(~0);
232 	val |= PREFETCH_ENB |
233 		USB2_MST_ID |
234 		ADDR_BNDRY(0xc) |
235 		INACTIVITY_TIMEOUT(0x1000);
236 	gizmo_writel(ahb, val, AHB_MEM_PREFETCH_CFG4);
237 }
238 
tegra_ahb_probe(struct platform_device * pdev)239 static int tegra_ahb_probe(struct platform_device *pdev)
240 {
241 	struct resource *res;
242 	struct tegra_ahb *ahb;
243 	size_t bytes;
244 
245 	bytes = sizeof(*ahb) + sizeof(u32) * ARRAY_SIZE(tegra_ahb_gizmo);
246 	ahb = devm_kzalloc(&pdev->dev, bytes, GFP_KERNEL);
247 	if (!ahb)
248 		return -ENOMEM;
249 
250 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
251 
252 	/* Correct the IP block base address if necessary */
253 	if (res &&
254 	    (res->start & INCORRECT_BASE_ADDR_LOW_BYTE) ==
255 	    INCORRECT_BASE_ADDR_LOW_BYTE) {
256 		dev_warn(&pdev->dev, "incorrect AHB base address in DT data - enabling workaround\n");
257 		res->start -= INCORRECT_BASE_ADDR_LOW_BYTE;
258 	}
259 
260 	ahb->regs = devm_ioremap_resource(&pdev->dev, res);
261 	if (IS_ERR(ahb->regs))
262 		return PTR_ERR(ahb->regs);
263 
264 	ahb->dev = &pdev->dev;
265 	platform_set_drvdata(pdev, ahb);
266 	tegra_ahb_gizmo_init(ahb);
267 	return 0;
268 }
269 
270 static const struct of_device_id tegra_ahb_of_match[] = {
271 	{ .compatible = "nvidia,tegra30-ahb", },
272 	{ .compatible = "nvidia,tegra20-ahb", },
273 	{},
274 };
275 
276 static struct platform_driver tegra_ahb_driver = {
277 	.probe = tegra_ahb_probe,
278 	.driver = {
279 		.name = DRV_NAME,
280 		.of_match_table = tegra_ahb_of_match,
281 		.pm = &tegra_ahb_pm,
282 	},
283 };
284 module_platform_driver(tegra_ahb_driver);
285 
286 MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
287 MODULE_DESCRIPTION("Tegra AHB driver");
288 MODULE_ALIAS("platform:" DRV_NAME);
289