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Andy Shevchenko9cade1a2013-06-05 15:26:45 +03001/*
2 * Platform driver for the Synopsys DesignWare DMA Controller
3 *
4 * Copyright (C) 2007-2008 Atmel Corporation
5 * Copyright (C) 2010-2011 ST Microelectronics
6 * Copyright (C) 2013 Intel Corporation
7 *
8 * 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.
13 */
14
15#include <linux/module.h>
16#include <linux/device.h>
17#include <linux/clk.h>
Andy Shevchenko6acf3992015-01-13 18:57:15 +020018#include <linux/pm_runtime.h>
Andy Shevchenko9cade1a2013-06-05 15:26:45 +030019#include <linux/platform_device.h>
20#include <linux/dmaengine.h>
21#include <linux/dma-mapping.h>
22#include <linux/of.h>
23#include <linux/of_dma.h>
24#include <linux/acpi.h>
25#include <linux/acpi_dma.h>
26
27#include "internal.h"
28
Andy Shevchenkoa104a452015-03-09 12:16:42 +020029#define DRV_NAME "dw_dmac"
30
Andy Shevchenko9cade1a2013-06-05 15:26:45 +030031static 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;
Andy Shevchenko4d130de2014-08-19 20:29:16 +030035 struct dw_dma_slave slave = {
36 .dma_dev = dw->dma.dev,
Andy Shevchenko9cade1a2013-06-05 15:26:45 +030037 };
38 dma_cap_mask_t cap;
39
40 if (dma_spec->args_count != 3)
41 return NULL;
42
Andy Shevchenko4d130de2014-08-19 20:29:16 +030043 slave.src_id = dma_spec->args[0];
44 slave.dst_id = dma_spec->args[0];
45 slave.src_master = dma_spec->args[1];
46 slave.dst_master = dma_spec->args[2];
Andy Shevchenko9cade1a2013-06-05 15:26:45 +030047
Andy Shevchenko4d130de2014-08-19 20:29:16 +030048 if (WARN_ON(slave.src_id >= DW_DMA_MAX_NR_REQUESTS ||
49 slave.dst_id >= DW_DMA_MAX_NR_REQUESTS ||
50 slave.src_master >= dw->nr_masters ||
51 slave.dst_master >= dw->nr_masters))
Andy Shevchenko9cade1a2013-06-05 15:26:45 +030052 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 */
Andy Shevchenko4d130de2014-08-19 20:29:16 +030058 return dma_request_channel(cap, dw_dma_filter, &slave);
Andy Shevchenko9cade1a2013-06-05 15:26:45 +030059}
60
61#ifdef CONFIG_ACPI
62static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
63{
Andy Shevchenko9cade1a2013-06-05 15:26:45 +030064 struct acpi_dma_spec *dma_spec = param;
Andy Shevchenko4d130de2014-08-19 20:29:16 +030065 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 .src_master = 1,
70 .dst_master = 0,
71 };
Andy Shevchenko9cade1a2013-06-05 15:26:45 +030072
Andy Shevchenko4d130de2014-08-19 20:29:16 +030073 return dw_dma_filter(chan, &slave);
Andy Shevchenko9cade1a2013-06-05 15:26:45 +030074}
75
76static 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 = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
91 info);
92 if (ret)
93 dev_err(dev, "could not register acpi_dma_controller\n");
94}
95#else /* !CONFIG_ACPI */
96static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
97#endif /* !CONFIG_ACPI */
98
99#ifdef CONFIG_OF
100static struct dw_dma_platform_data *
101dw_dma_parse_dt(struct platform_device *pdev)
102{
103 struct device_node *np = pdev->dev.of_node;
104 struct dw_dma_platform_data *pdata;
Andy Shevchenkod8ded502015-01-13 19:08:14 +0200105 u32 tmp, arr[DW_DMA_MAX_NR_MASTERS];
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300106
107 if (!np) {
108 dev_err(&pdev->dev, "Missing DT data\n");
109 return NULL;
110 }
111
112 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
113 if (!pdata)
114 return NULL;
115
116 if (of_property_read_u32(np, "dma-channels", &pdata->nr_channels))
117 return NULL;
118
119 if (of_property_read_bool(np, "is_private"))
120 pdata->is_private = true;
121
122 if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
123 pdata->chan_allocation_order = (unsigned char)tmp;
124
125 if (!of_property_read_u32(np, "chan_priority", &tmp))
126 pdata->chan_priority = tmp;
127
128 if (!of_property_read_u32(np, "block_size", &tmp))
129 pdata->block_size = tmp;
130
131 if (!of_property_read_u32(np, "dma-masters", &tmp)) {
Andy Shevchenkod8ded502015-01-13 19:08:14 +0200132 if (tmp > DW_DMA_MAX_NR_MASTERS)
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300133 return NULL;
134
135 pdata->nr_masters = tmp;
136 }
137
138 if (!of_property_read_u32_array(np, "data_width", arr,
139 pdata->nr_masters))
140 for (tmp = 0; tmp < pdata->nr_masters; tmp++)
141 pdata->data_width[tmp] = arr[tmp];
142
143 return pdata;
144}
145#else
146static inline struct dw_dma_platform_data *
147dw_dma_parse_dt(struct platform_device *pdev)
148{
149 return NULL;
150}
151#endif
152
153static int dw_probe(struct platform_device *pdev)
154{
155 struct dw_dma_chip *chip;
156 struct device *dev = &pdev->dev;
157 struct resource *mem;
158 struct dw_dma_platform_data *pdata;
159 int err;
160
161 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
162 if (!chip)
163 return -ENOMEM;
164
165 chip->irq = platform_get_irq(pdev, 0);
166 if (chip->irq < 0)
167 return chip->irq;
168
169 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
170 chip->regs = devm_ioremap_resource(dev, mem);
171 if (IS_ERR(chip->regs))
172 return PTR_ERR(chip->regs);
173
Russell King24353b82013-06-27 13:37:21 +0100174 err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
175 if (err)
176 return err;
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300177
178 pdata = dev_get_platdata(dev);
179 if (!pdata)
180 pdata = dw_dma_parse_dt(pdev);
181
182 chip->dev = dev;
183
Andy Shevchenkoa15636e2014-08-19 20:29:17 +0300184 chip->clk = devm_clk_get(chip->dev, "hclk");
185 if (IS_ERR(chip->clk))
186 return PTR_ERR(chip->clk);
187 err = clk_prepare_enable(chip->clk);
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300188 if (err)
189 return err;
190
Andy Shevchenko6acf3992015-01-13 18:57:15 +0200191 pm_runtime_enable(&pdev->dev);
192
Andy Shevchenkoa15636e2014-08-19 20:29:17 +0300193 err = dw_dma_probe(chip, pdata);
194 if (err)
195 goto err_dw_dma_probe;
196
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300197 platform_set_drvdata(pdev, chip);
198
199 if (pdev->dev.of_node) {
200 err = of_dma_controller_register(pdev->dev.of_node,
201 dw_dma_of_xlate, chip->dw);
202 if (err)
203 dev_err(&pdev->dev,
204 "could not register of_dma_controller\n");
205 }
206
207 if (ACPI_HANDLE(&pdev->dev))
208 dw_dma_acpi_controller_register(chip->dw);
209
210 return 0;
Andy Shevchenkoa15636e2014-08-19 20:29:17 +0300211
212err_dw_dma_probe:
Andy Shevchenko6acf3992015-01-13 18:57:15 +0200213 pm_runtime_disable(&pdev->dev);
Andy Shevchenkoa15636e2014-08-19 20:29:17 +0300214 clk_disable_unprepare(chip->clk);
215 return err;
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300216}
217
218static int dw_remove(struct platform_device *pdev)
219{
220 struct dw_dma_chip *chip = platform_get_drvdata(pdev);
221
222 if (pdev->dev.of_node)
223 of_dma_controller_free(pdev->dev.of_node);
224
Andy Shevchenkoa15636e2014-08-19 20:29:17 +0300225 dw_dma_remove(chip);
Andy Shevchenko6acf3992015-01-13 18:57:15 +0200226 pm_runtime_disable(&pdev->dev);
Andy Shevchenkoa15636e2014-08-19 20:29:17 +0300227 clk_disable_unprepare(chip->clk);
228
229 return 0;
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300230}
231
232static void dw_shutdown(struct platform_device *pdev)
233{
234 struct dw_dma_chip *chip = platform_get_drvdata(pdev);
235
Andy Shevchenko2540f742014-09-23 17:18:13 +0300236 dw_dma_disable(chip);
Andy Shevchenkoa15636e2014-08-19 20:29:17 +0300237 clk_disable_unprepare(chip->clk);
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300238}
239
240#ifdef CONFIG_OF
241static const struct of_device_id dw_dma_of_id_table[] = {
242 { .compatible = "snps,dma-spear1340" },
243 {}
244};
245MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
246#endif
247
248#ifdef CONFIG_ACPI
249static const struct acpi_device_id dw_dma_acpi_id_table[] = {
250 { "INTL9C60", 0 },
251 { }
252};
Andy Shevchenkobe480dc2013-07-15 15:04:37 +0300253MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table);
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300254#endif
255
256#ifdef CONFIG_PM_SLEEP
257
Andy Shevchenko067bd4f2014-04-15 16:18:41 +0300258static int dw_suspend_late(struct device *dev)
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300259{
260 struct platform_device *pdev = to_platform_device(dev);
261 struct dw_dma_chip *chip = platform_get_drvdata(pdev);
262
Andy Shevchenko2540f742014-09-23 17:18:13 +0300263 dw_dma_disable(chip);
Andy Shevchenkoa15636e2014-08-19 20:29:17 +0300264 clk_disable_unprepare(chip->clk);
265
266 return 0;
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300267}
268
Andy Shevchenko067bd4f2014-04-15 16:18:41 +0300269static int dw_resume_early(struct device *dev)
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300270{
271 struct platform_device *pdev = to_platform_device(dev);
272 struct dw_dma_chip *chip = platform_get_drvdata(pdev);
273
Andy Shevchenkoa15636e2014-08-19 20:29:17 +0300274 clk_prepare_enable(chip->clk);
Andy Shevchenko2540f742014-09-23 17:18:13 +0300275 return dw_dma_enable(chip);
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300276}
277
Andy Shevchenko067bd4f2014-04-15 16:18:41 +0300278#endif /* CONFIG_PM_SLEEP */
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300279
280static const struct dev_pm_ops dw_dev_pm_ops = {
Andy Shevchenko067bd4f2014-04-15 16:18:41 +0300281 SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_suspend_late, dw_resume_early)
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300282};
283
284static struct platform_driver dw_driver = {
285 .probe = dw_probe,
286 .remove = dw_remove,
Andy Shevchenko2540f742014-09-23 17:18:13 +0300287 .shutdown = dw_shutdown,
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300288 .driver = {
Andy Shevchenkoa104a452015-03-09 12:16:42 +0200289 .name = DRV_NAME,
Andy Shevchenko9cade1a2013-06-05 15:26:45 +0300290 .pm = &dw_dev_pm_ops,
291 .of_match_table = of_match_ptr(dw_dma_of_id_table),
292 .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
293 },
294};
295
296static int __init dw_init(void)
297{
298 return platform_driver_register(&dw_driver);
299}
300subsys_initcall(dw_init);
301
302static void __exit dw_exit(void)
303{
304 platform_driver_unregister(&dw_driver);
305}
306module_exit(dw_exit);
307
308MODULE_LICENSE("GPL v2");
309MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");
Andy Shevchenkoa104a452015-03-09 12:16:42 +0200310MODULE_ALIAS("platform:" DRV_NAME);