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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/dma/dw/platform.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0
12 /*
23  * Platform driver for the Synopsys DesignWare DMA Controller
34  *
....@@ -6,10 +7,6 @@
67  * Copyright (C) 2013 Intel Corporation
78  *
89  * Some parts of this driver are derived from the original dw_dmac.
9
- *
10
- * This program is free software; you can redistribute it and/or modify
11
- * it under the terms of the GNU General Public License version 2 as
12
- * published by the Free Software Foundation.
1310  */
1411 
1512 #include <linux/module.h>
....@@ -20,178 +17,27 @@
2017 #include <linux/dmaengine.h>
2118 #include <linux/dma-mapping.h>
2219 #include <linux/of.h>
23
-#include <linux/of_dma.h>
2420 #include <linux/acpi.h>
25
-#include <linux/acpi_dma.h>
2621 
2722 #include "internal.h"
2823 
2924 #define DRV_NAME	"dw_dmac"
3025 
31
-static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
32
-					struct of_dma *ofdma)
33
-{
34
-	struct dw_dma *dw = ofdma->of_dma_data;
35
-	struct dw_dma_slave slave = {
36
-		.dma_dev = dw->dma.dev,
37
-	};
38
-	dma_cap_mask_t cap;
39
-
40
-	if (dma_spec->args_count != 3)
41
-		return NULL;
42
-
43
-	slave.src_id = dma_spec->args[0];
44
-	slave.dst_id = dma_spec->args[0];
45
-	slave.m_master = dma_spec->args[1];
46
-	slave.p_master = dma_spec->args[2];
47
-
48
-	if (WARN_ON(slave.src_id >= DW_DMA_MAX_NR_REQUESTS ||
49
-		    slave.dst_id >= DW_DMA_MAX_NR_REQUESTS ||
50
-		    slave.m_master >= dw->pdata->nr_masters ||
51
-		    slave.p_master >= dw->pdata->nr_masters))
52
-		return NULL;
53
-
54
-	dma_cap_zero(cap);
55
-	dma_cap_set(DMA_SLAVE, cap);
56
-
57
-	/* TODO: there should be a simpler way to do this */
58
-	return dma_request_channel(cap, dw_dma_filter, &slave);
59
-}
60
-
61
-#ifdef CONFIG_ACPI
62
-static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
63
-{
64
-	struct acpi_dma_spec *dma_spec = param;
65
-	struct dw_dma_slave slave = {
66
-		.dma_dev = dma_spec->dev,
67
-		.src_id = dma_spec->slave_id,
68
-		.dst_id = dma_spec->slave_id,
69
-		.m_master = 0,
70
-		.p_master = 1,
71
-	};
72
-
73
-	return dw_dma_filter(chan, &slave);
74
-}
75
-
76
-static void dw_dma_acpi_controller_register(struct dw_dma *dw)
77
-{
78
-	struct device *dev = dw->dma.dev;
79
-	struct acpi_dma_filter_info *info;
80
-	int ret;
81
-
82
-	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
83
-	if (!info)
84
-		return;
85
-
86
-	dma_cap_zero(info->dma_cap);
87
-	dma_cap_set(DMA_SLAVE, info->dma_cap);
88
-	info->filter_fn = dw_dma_acpi_filter;
89
-
90
-	ret = acpi_dma_controller_register(dev, acpi_dma_simple_xlate, info);
91
-	if (ret)
92
-		dev_err(dev, "could not register acpi_dma_controller\n");
93
-}
94
-
95
-static void dw_dma_acpi_controller_free(struct dw_dma *dw)
96
-{
97
-	struct device *dev = dw->dma.dev;
98
-
99
-	acpi_dma_controller_free(dev);
100
-}
101
-#else /* !CONFIG_ACPI */
102
-static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
103
-static inline void dw_dma_acpi_controller_free(struct dw_dma *dw) {}
104
-#endif /* !CONFIG_ACPI */
105
-
106
-#ifdef CONFIG_OF
107
-static struct dw_dma_platform_data *
108
-dw_dma_parse_dt(struct platform_device *pdev)
109
-{
110
-	struct device_node *np = pdev->dev.of_node;
111
-	struct dw_dma_platform_data *pdata;
112
-	u32 tmp, arr[DW_DMA_MAX_NR_MASTERS], mb[DW_DMA_MAX_NR_CHANNELS];
113
-	u32 nr_masters;
114
-	u32 nr_channels;
115
-
116
-	if (!np) {
117
-		dev_err(&pdev->dev, "Missing DT data\n");
118
-		return NULL;
119
-	}
120
-
121
-	if (of_property_read_u32(np, "dma-masters", &nr_masters))
122
-		return NULL;
123
-	if (nr_masters < 1 || nr_masters > DW_DMA_MAX_NR_MASTERS)
124
-		return NULL;
125
-
126
-	if (of_property_read_u32(np, "dma-channels", &nr_channels))
127
-		return NULL;
128
-	if (nr_channels > DW_DMA_MAX_NR_CHANNELS)
129
-		return NULL;
130
-
131
-	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
132
-	if (!pdata)
133
-		return NULL;
134
-
135
-	pdata->nr_masters = nr_masters;
136
-	pdata->nr_channels = nr_channels;
137
-
138
-	if (of_property_read_bool(np, "is_private"))
139
-		pdata->is_private = true;
140
-
141
-	/*
142
-	 * All known devices, which use DT for configuration, support
143
-	 * memory-to-memory transfers. So enable it by default.
144
-	 */
145
-	pdata->is_memcpy = true;
146
-
147
-	if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
148
-		pdata->chan_allocation_order = (unsigned char)tmp;
149
-
150
-	if (!of_property_read_u32(np, "chan_priority", &tmp))
151
-		pdata->chan_priority = tmp;
152
-
153
-	if (!of_property_read_u32(np, "block_size", &tmp))
154
-		pdata->block_size = tmp;
155
-
156
-	if (!of_property_read_u32_array(np, "data-width", arr, nr_masters)) {
157
-		for (tmp = 0; tmp < nr_masters; tmp++)
158
-			pdata->data_width[tmp] = arr[tmp];
159
-	} else if (!of_property_read_u32_array(np, "data_width", arr, nr_masters)) {
160
-		for (tmp = 0; tmp < nr_masters; tmp++)
161
-			pdata->data_width[tmp] = BIT(arr[tmp] & 0x07);
162
-	}
163
-
164
-	if (!of_property_read_u32_array(np, "multi-block", mb, nr_channels)) {
165
-		for (tmp = 0; tmp < nr_channels; tmp++)
166
-			pdata->multi_block[tmp] = mb[tmp];
167
-	} else {
168
-		for (tmp = 0; tmp < nr_channels; tmp++)
169
-			pdata->multi_block[tmp] = 1;
170
-	}
171
-
172
-	if (!of_property_read_u32(np, "snps,dma-protection-control", &tmp)) {
173
-		if (tmp > CHAN_PROTCTL_MASK)
174
-			return NULL;
175
-		pdata->protctl = tmp;
176
-	}
177
-
178
-	return pdata;
179
-}
180
-#else
181
-static inline struct dw_dma_platform_data *
182
-dw_dma_parse_dt(struct platform_device *pdev)
183
-{
184
-	return NULL;
185
-}
186
-#endif
187
-
18826 static int dw_probe(struct platform_device *pdev)
18927 {
28
+	const struct dw_dma_chip_pdata *match;
29
+	struct dw_dma_chip_pdata *data;
19030 	struct dw_dma_chip *chip;
19131 	struct device *dev = &pdev->dev;
192
-	struct resource *mem;
193
-	const struct dw_dma_platform_data *pdata;
19432 	int err;
33
+
34
+	match = device_get_match_data(dev);
35
+	if (!match)
36
+		return -ENODEV;
37
+
38
+	data = devm_kmemdup(&pdev->dev, match, sizeof(*match), GFP_KERNEL);
39
+	if (!data)
40
+		return -ENOMEM;
19541 
19642 	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
19743 	if (!chip)
....@@ -201,8 +47,7 @@
20147 	if (chip->irq < 0)
20248 		return chip->irq;
20349 
204
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
205
-	chip->regs = devm_ioremap_resource(dev, mem);
50
+	chip->regs = devm_platform_ioremap_resource(pdev, 0);
20651 	if (IS_ERR(chip->regs))
20752 		return PTR_ERR(chip->regs);
20853 
....@@ -210,15 +55,18 @@
21055 	if (err)
21156 		return err;
21257 
213
-	pdata = dev_get_platdata(dev);
214
-	if (!pdata)
215
-		pdata = dw_dma_parse_dt(pdev);
58
+	if (!data->pdata)
59
+		data->pdata = dev_get_platdata(dev);
60
+	if (!data->pdata)
61
+		data->pdata = dw_dma_parse_dt(pdev);
21662 
21763 	chip->dev = dev;
21864 	chip->id = pdev->id;
219
-	chip->pdata = pdata;
65
+	chip->pdata = data->pdata;
22066 
221
-	chip->clk = devm_clk_get(chip->dev, "hclk");
67
+	data->chip = chip;
68
+
69
+	chip->clk = devm_clk_get_optional(chip->dev, "hclk");
22270 	if (IS_ERR(chip->clk))
22371 		return PTR_ERR(chip->clk);
22472 	err = clk_prepare_enable(chip->clk);
....@@ -227,22 +75,15 @@
22775 
22876 	pm_runtime_enable(&pdev->dev);
22977 
230
-	err = dw_dma_probe(chip);
78
+	err = data->probe(chip);
23179 	if (err)
23280 		goto err_dw_dma_probe;
23381 
234
-	platform_set_drvdata(pdev, chip);
82
+	platform_set_drvdata(pdev, data);
23583 
236
-	if (pdev->dev.of_node) {
237
-		err = of_dma_controller_register(pdev->dev.of_node,
238
-						 dw_dma_of_xlate, chip->dw);
239
-		if (err)
240
-			dev_err(&pdev->dev,
241
-				"could not register of_dma_controller\n");
242
-	}
84
+	dw_dma_of_controller_register(chip->dw);
24385 
244
-	if (ACPI_HANDLE(&pdev->dev))
245
-		dw_dma_acpi_controller_register(chip->dw);
86
+	dw_dma_acpi_controller_register(chip->dw);
24687 
24788 	return 0;
24889 
....@@ -254,15 +95,18 @@
25495 
25596 static int dw_remove(struct platform_device *pdev)
25697 {
257
-	struct dw_dma_chip *chip = platform_get_drvdata(pdev);
98
+	struct dw_dma_chip_pdata *data = platform_get_drvdata(pdev);
99
+	struct dw_dma_chip *chip = data->chip;
100
+	int ret;
258101 
259
-	if (ACPI_HANDLE(&pdev->dev))
260
-		dw_dma_acpi_controller_free(chip->dw);
102
+	dw_dma_acpi_controller_free(chip->dw);
261103 
262
-	if (pdev->dev.of_node)
263
-		of_dma_controller_free(pdev->dev.of_node);
104
+	dw_dma_of_controller_free(chip->dw);
264105 
265
-	dw_dma_remove(chip);
106
+	ret = data->remove(chip);
107
+	if (ret)
108
+		dev_warn(chip->dev, "can't remove device properly: %d\n", ret);
109
+
266110 	pm_runtime_disable(&pdev->dev);
267111 	clk_disable_unprepare(chip->clk);
268112 
....@@ -271,10 +115,11 @@
271115 
272116 static void dw_shutdown(struct platform_device *pdev)
273117 {
274
-	struct dw_dma_chip *chip = platform_get_drvdata(pdev);
118
+	struct dw_dma_chip_pdata *data = platform_get_drvdata(pdev);
119
+	struct dw_dma_chip *chip = data->chip;
275120 
276121 	/*
277
-	 * We have to call dw_dma_disable() to stop any ongoing transfer. On
122
+	 * We have to call do_dw_dma_disable() to stop any ongoing transfer. On
278123 	 * some platforms we can't do that since DMA device is powered off.
279124 	 * Moreover we have no possibility to check if the platform is affected
280125 	 * or not. That's why we call pm_runtime_get_sync() / pm_runtime_put()
....@@ -283,7 +128,7 @@
283128 	 * used by the driver.
284129 	 */
285130 	pm_runtime_get_sync(chip->dev);
286
-	dw_dma_disable(chip);
131
+	do_dw_dma_disable(chip);
287132 	pm_runtime_put_sync_suspend(chip->dev);
288133 
289134 	clk_disable_unprepare(chip->clk);
....@@ -291,7 +136,7 @@
291136 
292137 #ifdef CONFIG_OF
293138 static const struct of_device_id dw_dma_of_id_table[] = {
294
-	{ .compatible = "snps,dma-spear1340" },
139
+	{ .compatible = "snps,dma-spear1340", .data = &dw_dma_chip_pdata },
295140 	{}
296141 };
297142 MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
....@@ -299,7 +144,15 @@
299144 
300145 #ifdef CONFIG_ACPI
301146 static const struct acpi_device_id dw_dma_acpi_id_table[] = {
302
-	{ "INTL9C60", 0 },
147
+	{ "INTL9C60", (kernel_ulong_t)&dw_dma_chip_pdata },
148
+	{ "80862286", (kernel_ulong_t)&dw_dma_chip_pdata },
149
+	{ "808622C0", (kernel_ulong_t)&dw_dma_chip_pdata },
150
+
151
+	/* Elkhart Lake iDMA 32-bit (PSE DMA) */
152
+	{ "80864BB4", (kernel_ulong_t)&idma32_chip_pdata },
153
+	{ "80864BB5", (kernel_ulong_t)&idma32_chip_pdata },
154
+	{ "80864BB6", (kernel_ulong_t)&idma32_chip_pdata },
155
+
303156 	{ }
304157 };
305158 MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table);
....@@ -309,9 +162,10 @@
309162 
310163 static int dw_suspend_late(struct device *dev)
311164 {
312
-	struct dw_dma_chip *chip = dev_get_drvdata(dev);
165
+	struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);
166
+	struct dw_dma_chip *chip = data->chip;
313167 
314
-	dw_dma_disable(chip);
168
+	do_dw_dma_disable(chip);
315169 	clk_disable_unprepare(chip->clk);
316170 
317171 	return 0;
....@@ -319,14 +173,15 @@
319173 
320174 static int dw_resume_early(struct device *dev)
321175 {
322
-	struct dw_dma_chip *chip = dev_get_drvdata(dev);
176
+	struct dw_dma_chip_pdata *data = dev_get_drvdata(dev);
177
+	struct dw_dma_chip *chip = data->chip;
323178 	int ret;
324179 
325180 	ret = clk_prepare_enable(chip->clk);
326181 	if (ret)
327182 		return ret;
328183 
329
-	return dw_dma_enable(chip);
184
+	return do_dw_dma_enable(chip);
330185 }
331186 
332187 #endif /* CONFIG_PM_SLEEP */