1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Platform driver for the Synopsys DesignWare DMA Controller |
4 | * |
5 | * Copyright (C) 2007-2008 Atmel Corporation |
6 | * Copyright (C) 2010-2011 ST Microelectronics |
7 | * Copyright (C) 2013 Intel Corporation |
8 | * |
9 | * Some parts of this driver are derived from the original dw_dmac. |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/device.h> |
14 | #include <linux/clk.h> |
15 | #include <linux/pm_runtime.h> |
16 | #include <linux/platform_device.h> |
17 | #include <linux/dmaengine.h> |
18 | #include <linux/dma-mapping.h> |
19 | #include <linux/of.h> |
20 | #include <linux/acpi.h> |
21 | |
22 | #include "internal.h" |
23 | |
24 | #define DRV_NAME "dw_dmac" |
25 | |
26 | static int dw_probe(struct platform_device *pdev) |
27 | { |
28 | const struct dw_dma_chip_pdata *match; |
29 | struct dw_dma_chip_pdata *data; |
30 | struct dw_dma_chip *chip; |
31 | struct device *dev = &pdev->dev; |
32 | int err; |
33 | |
34 | match = device_get_match_data(dev); |
35 | if (!match) |
36 | return -ENODEV; |
37 | |
38 | data = devm_kmemdup(dev: &pdev->dev, src: match, len: sizeof(*match), GFP_KERNEL); |
39 | if (!data) |
40 | return -ENOMEM; |
41 | |
42 | chip = devm_kzalloc(dev, size: sizeof(*chip), GFP_KERNEL); |
43 | if (!chip) |
44 | return -ENOMEM; |
45 | |
46 | chip->irq = platform_get_irq(pdev, 0); |
47 | if (chip->irq < 0) |
48 | return chip->irq; |
49 | |
50 | chip->regs = devm_platform_ioremap_resource(pdev, index: 0); |
51 | if (IS_ERR(ptr: chip->regs)) |
52 | return PTR_ERR(ptr: chip->regs); |
53 | |
54 | err = dma_coerce_mask_and_coherent(dev: &pdev->dev, DMA_BIT_MASK(32)); |
55 | if (err) |
56 | return err; |
57 | |
58 | if (!data->pdata) |
59 | data->pdata = dev_get_platdata(dev); |
60 | if (!data->pdata) |
61 | data->pdata = dw_dma_parse_dt(pdev); |
62 | |
63 | chip->dev = dev; |
64 | chip->id = pdev->id; |
65 | chip->pdata = data->pdata; |
66 | |
67 | data->chip = chip; |
68 | |
69 | chip->clk = devm_clk_get_optional(dev: chip->dev, id: "hclk" ); |
70 | if (IS_ERR(ptr: chip->clk)) |
71 | return PTR_ERR(ptr: chip->clk); |
72 | err = clk_prepare_enable(clk: chip->clk); |
73 | if (err) |
74 | return err; |
75 | |
76 | pm_runtime_enable(dev: &pdev->dev); |
77 | |
78 | err = data->probe(chip); |
79 | if (err) |
80 | goto err_dw_dma_probe; |
81 | |
82 | platform_set_drvdata(pdev, data); |
83 | |
84 | dw_dma_of_controller_register(dw: chip->dw); |
85 | |
86 | dw_dma_acpi_controller_register(dw: chip->dw); |
87 | |
88 | return 0; |
89 | |
90 | err_dw_dma_probe: |
91 | pm_runtime_disable(dev: &pdev->dev); |
92 | clk_disable_unprepare(clk: chip->clk); |
93 | return err; |
94 | } |
95 | |
96 | static void dw_remove(struct platform_device *pdev) |
97 | { |
98 | struct dw_dma_chip_pdata *data = platform_get_drvdata(pdev); |
99 | struct dw_dma_chip *chip = data->chip; |
100 | int ret; |
101 | |
102 | dw_dma_acpi_controller_free(dw: chip->dw); |
103 | |
104 | dw_dma_of_controller_free(dw: chip->dw); |
105 | |
106 | ret = data->remove(chip); |
107 | if (ret) |
108 | dev_warn(chip->dev, "can't remove device properly: %d\n" , ret); |
109 | |
110 | pm_runtime_disable(dev: &pdev->dev); |
111 | clk_disable_unprepare(clk: chip->clk); |
112 | } |
113 | |
114 | static void dw_shutdown(struct platform_device *pdev) |
115 | { |
116 | struct dw_dma_chip_pdata *data = platform_get_drvdata(pdev); |
117 | struct dw_dma_chip *chip = data->chip; |
118 | |
119 | /* |
120 | * We have to call do_dw_dma_disable() to stop any ongoing transfer. On |
121 | * some platforms we can't do that since DMA device is powered off. |
122 | * Moreover we have no possibility to check if the platform is affected |
123 | * or not. That's why we call pm_runtime_get_sync() / pm_runtime_put() |
124 | * unconditionally. On the other hand we can't use |
125 | * pm_runtime_suspended() because runtime PM framework is not fully |
126 | * used by the driver. |
127 | */ |
128 | pm_runtime_get_sync(dev: chip->dev); |
129 | do_dw_dma_disable(chip); |
130 | pm_runtime_put_sync_suspend(dev: chip->dev); |
131 | |
132 | clk_disable_unprepare(clk: chip->clk); |
133 | } |
134 | |
135 | #ifdef CONFIG_OF |
136 | static const struct of_device_id dw_dma_of_id_table[] = { |
137 | { .compatible = "snps,dma-spear1340" , .data = &dw_dma_chip_pdata }, |
138 | { .compatible = "renesas,rzn1-dma" , .data = &dw_dma_chip_pdata }, |
139 | {} |
140 | }; |
141 | MODULE_DEVICE_TABLE(of, dw_dma_of_id_table); |
142 | #endif |
143 | |
144 | #ifdef CONFIG_ACPI |
145 | static const struct acpi_device_id dw_dma_acpi_id_table[] = { |
146 | { "INTL9C60" , (kernel_ulong_t)&dw_dma_chip_pdata }, |
147 | { "80862286" , (kernel_ulong_t)&dw_dma_chip_pdata }, |
148 | { "808622C0" , (kernel_ulong_t)&dw_dma_chip_pdata }, |
149 | |
150 | /* Elkhart Lake iDMA 32-bit (PSE DMA) */ |
151 | { "80864BB4" , (kernel_ulong_t)&xbar_chip_pdata }, |
152 | { "80864BB5" , (kernel_ulong_t)&xbar_chip_pdata }, |
153 | { "80864BB6" , (kernel_ulong_t)&xbar_chip_pdata }, |
154 | |
155 | { } |
156 | }; |
157 | MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table); |
158 | #endif |
159 | |
160 | #ifdef CONFIG_PM_SLEEP |
161 | |
162 | static int dw_suspend_late(struct device *dev) |
163 | { |
164 | struct dw_dma_chip_pdata *data = dev_get_drvdata(dev); |
165 | struct dw_dma_chip *chip = data->chip; |
166 | |
167 | do_dw_dma_disable(chip); |
168 | clk_disable_unprepare(clk: chip->clk); |
169 | |
170 | return 0; |
171 | } |
172 | |
173 | static int dw_resume_early(struct device *dev) |
174 | { |
175 | struct dw_dma_chip_pdata *data = dev_get_drvdata(dev); |
176 | struct dw_dma_chip *chip = data->chip; |
177 | int ret; |
178 | |
179 | ret = clk_prepare_enable(clk: chip->clk); |
180 | if (ret) |
181 | return ret; |
182 | |
183 | return do_dw_dma_enable(chip); |
184 | } |
185 | |
186 | #endif /* CONFIG_PM_SLEEP */ |
187 | |
188 | static const struct dev_pm_ops dw_dev_pm_ops = { |
189 | SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_suspend_late, dw_resume_early) |
190 | }; |
191 | |
192 | static struct platform_driver dw_driver = { |
193 | .probe = dw_probe, |
194 | .remove_new = dw_remove, |
195 | .shutdown = dw_shutdown, |
196 | .driver = { |
197 | .name = DRV_NAME, |
198 | .pm = &dw_dev_pm_ops, |
199 | .of_match_table = of_match_ptr(dw_dma_of_id_table), |
200 | .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table), |
201 | }, |
202 | }; |
203 | |
204 | static int __init dw_init(void) |
205 | { |
206 | return platform_driver_register(&dw_driver); |
207 | } |
208 | subsys_initcall(dw_init); |
209 | |
210 | static void __exit dw_exit(void) |
211 | { |
212 | platform_driver_unregister(&dw_driver); |
213 | } |
214 | module_exit(dw_exit); |
215 | |
216 | MODULE_LICENSE("GPL v2" ); |
217 | MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver" ); |
218 | MODULE_ALIAS("platform:" DRV_NAME); |
219 | |