Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 1 | /* |
| 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 Shevchenko | 6acf399 | 2015-01-13 18:57:15 +0200 | [diff] [blame] | 18 | #include <linux/pm_runtime.h> |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 19 | #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 Shevchenko | a104a45 | 2015-03-09 12:16:42 +0200 | [diff] [blame] | 29 | #define DRV_NAME "dw_dmac" |
| 30 | |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 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; |
Andy Shevchenko | 4d130de | 2014-08-19 20:29:16 +0300 | [diff] [blame] | 35 | struct dw_dma_slave slave = { |
| 36 | .dma_dev = dw->dma.dev, |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 37 | }; |
| 38 | dma_cap_mask_t cap; |
| 39 | |
| 40 | if (dma_spec->args_count != 3) |
| 41 | return NULL; |
| 42 | |
Andy Shevchenko | 4d130de | 2014-08-19 20:29:16 +0300 | [diff] [blame] | 43 | 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 Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 47 | |
Andy Shevchenko | 4d130de | 2014-08-19 20:29:16 +0300 | [diff] [blame] | 48 | 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 Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 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 */ |
Andy Shevchenko | 4d130de | 2014-08-19 20:29:16 +0300 | [diff] [blame] | 58 | return dma_request_channel(cap, dw_dma_filter, &slave); |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | #ifdef CONFIG_ACPI |
| 62 | static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param) |
| 63 | { |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 64 | struct acpi_dma_spec *dma_spec = param; |
Andy Shevchenko | 4d130de | 2014-08-19 20:29:16 +0300 | [diff] [blame] | 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 | .src_master = 1, |
| 70 | .dst_master = 0, |
| 71 | }; |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 72 | |
Andy Shevchenko | 4d130de | 2014-08-19 20:29:16 +0300 | [diff] [blame] | 73 | return dw_dma_filter(chan, &slave); |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 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 = 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 */ |
| 96 | static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {} |
| 97 | #endif /* !CONFIG_ACPI */ |
| 98 | |
| 99 | #ifdef CONFIG_OF |
| 100 | static struct dw_dma_platform_data * |
| 101 | dw_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 Shevchenko | d8ded50 | 2015-01-13 19:08:14 +0200 | [diff] [blame] | 105 | u32 tmp, arr[DW_DMA_MAX_NR_MASTERS]; |
Mans Rullgard | 2b574ba | 2015-12-17 23:30:57 +0000 | [diff] [blame] | 106 | u32 nr_channels; |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 107 | |
| 108 | if (!np) { |
| 109 | dev_err(&pdev->dev, "Missing DT data\n"); |
| 110 | return NULL; |
| 111 | } |
| 112 | |
Mans Rullgard | 2b574ba | 2015-12-17 23:30:57 +0000 | [diff] [blame] | 113 | if (of_property_read_u32(np, "dma-channels", &nr_channels)) |
| 114 | return NULL; |
| 115 | |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 116 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); |
| 117 | if (!pdata) |
| 118 | return NULL; |
| 119 | |
Mans Rullgard | 2b574ba | 2015-12-17 23:30:57 +0000 | [diff] [blame] | 120 | pdata->nr_channels = nr_channels; |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 121 | |
| 122 | if (of_property_read_bool(np, "is_private")) |
| 123 | pdata->is_private = true; |
| 124 | |
| 125 | if (!of_property_read_u32(np, "chan_allocation_order", &tmp)) |
| 126 | pdata->chan_allocation_order = (unsigned char)tmp; |
| 127 | |
| 128 | if (!of_property_read_u32(np, "chan_priority", &tmp)) |
| 129 | pdata->chan_priority = tmp; |
| 130 | |
| 131 | if (!of_property_read_u32(np, "block_size", &tmp)) |
| 132 | pdata->block_size = tmp; |
| 133 | |
| 134 | if (!of_property_read_u32(np, "dma-masters", &tmp)) { |
Andy Shevchenko | d8ded50 | 2015-01-13 19:08:14 +0200 | [diff] [blame] | 135 | if (tmp > DW_DMA_MAX_NR_MASTERS) |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 136 | return NULL; |
| 137 | |
| 138 | pdata->nr_masters = tmp; |
| 139 | } |
| 140 | |
| 141 | if (!of_property_read_u32_array(np, "data_width", arr, |
| 142 | pdata->nr_masters)) |
| 143 | for (tmp = 0; tmp < pdata->nr_masters; tmp++) |
| 144 | pdata->data_width[tmp] = arr[tmp]; |
| 145 | |
| 146 | return pdata; |
| 147 | } |
| 148 | #else |
| 149 | static inline struct dw_dma_platform_data * |
| 150 | dw_dma_parse_dt(struct platform_device *pdev) |
| 151 | { |
| 152 | return NULL; |
| 153 | } |
| 154 | #endif |
| 155 | |
| 156 | static int dw_probe(struct platform_device *pdev) |
| 157 | { |
| 158 | struct dw_dma_chip *chip; |
| 159 | struct device *dev = &pdev->dev; |
| 160 | struct resource *mem; |
| 161 | struct dw_dma_platform_data *pdata; |
| 162 | int err; |
| 163 | |
| 164 | chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); |
| 165 | if (!chip) |
| 166 | return -ENOMEM; |
| 167 | |
| 168 | chip->irq = platform_get_irq(pdev, 0); |
| 169 | if (chip->irq < 0) |
| 170 | return chip->irq; |
| 171 | |
| 172 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 173 | chip->regs = devm_ioremap_resource(dev, mem); |
| 174 | if (IS_ERR(chip->regs)) |
| 175 | return PTR_ERR(chip->regs); |
| 176 | |
Russell King | 24353b8 | 2013-06-27 13:37:21 +0100 | [diff] [blame] | 177 | err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); |
| 178 | if (err) |
| 179 | return err; |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 180 | |
| 181 | pdata = dev_get_platdata(dev); |
| 182 | if (!pdata) |
| 183 | pdata = dw_dma_parse_dt(pdev); |
| 184 | |
| 185 | chip->dev = dev; |
| 186 | |
Andy Shevchenko | a15636e | 2014-08-19 20:29:17 +0300 | [diff] [blame] | 187 | chip->clk = devm_clk_get(chip->dev, "hclk"); |
| 188 | if (IS_ERR(chip->clk)) |
| 189 | return PTR_ERR(chip->clk); |
| 190 | err = clk_prepare_enable(chip->clk); |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 191 | if (err) |
| 192 | return err; |
| 193 | |
Andy Shevchenko | 6acf399 | 2015-01-13 18:57:15 +0200 | [diff] [blame] | 194 | pm_runtime_enable(&pdev->dev); |
| 195 | |
Andy Shevchenko | a15636e | 2014-08-19 20:29:17 +0300 | [diff] [blame] | 196 | err = dw_dma_probe(chip, pdata); |
| 197 | if (err) |
| 198 | goto err_dw_dma_probe; |
| 199 | |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 200 | platform_set_drvdata(pdev, chip); |
| 201 | |
| 202 | if (pdev->dev.of_node) { |
| 203 | err = of_dma_controller_register(pdev->dev.of_node, |
| 204 | dw_dma_of_xlate, chip->dw); |
| 205 | if (err) |
| 206 | dev_err(&pdev->dev, |
| 207 | "could not register of_dma_controller\n"); |
| 208 | } |
| 209 | |
| 210 | if (ACPI_HANDLE(&pdev->dev)) |
| 211 | dw_dma_acpi_controller_register(chip->dw); |
| 212 | |
| 213 | return 0; |
Andy Shevchenko | a15636e | 2014-08-19 20:29:17 +0300 | [diff] [blame] | 214 | |
| 215 | err_dw_dma_probe: |
Andy Shevchenko | 6acf399 | 2015-01-13 18:57:15 +0200 | [diff] [blame] | 216 | pm_runtime_disable(&pdev->dev); |
Andy Shevchenko | a15636e | 2014-08-19 20:29:17 +0300 | [diff] [blame] | 217 | clk_disable_unprepare(chip->clk); |
| 218 | return err; |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | static int dw_remove(struct platform_device *pdev) |
| 222 | { |
| 223 | struct dw_dma_chip *chip = platform_get_drvdata(pdev); |
| 224 | |
| 225 | if (pdev->dev.of_node) |
| 226 | of_dma_controller_free(pdev->dev.of_node); |
| 227 | |
Andy Shevchenko | a15636e | 2014-08-19 20:29:17 +0300 | [diff] [blame] | 228 | dw_dma_remove(chip); |
Andy Shevchenko | 6acf399 | 2015-01-13 18:57:15 +0200 | [diff] [blame] | 229 | pm_runtime_disable(&pdev->dev); |
Andy Shevchenko | a15636e | 2014-08-19 20:29:17 +0300 | [diff] [blame] | 230 | clk_disable_unprepare(chip->clk); |
| 231 | |
| 232 | return 0; |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | static void dw_shutdown(struct platform_device *pdev) |
| 236 | { |
| 237 | struct dw_dma_chip *chip = platform_get_drvdata(pdev); |
| 238 | |
Andy Shevchenko | 3214658 | 2015-12-04 23:49:23 +0200 | [diff] [blame] | 239 | /* |
| 240 | * We have to call dw_dma_disable() to stop any ongoing transfer. On |
| 241 | * some platforms we can't do that since DMA device is powered off. |
| 242 | * Moreover we have no possibility to check if the platform is affected |
| 243 | * or not. That's why we call pm_runtime_get_sync() / pm_runtime_put() |
| 244 | * unconditionally. On the other hand we can't use |
| 245 | * pm_runtime_suspended() because runtime PM framework is not fully |
| 246 | * used by the driver. |
| 247 | */ |
| 248 | pm_runtime_get_sync(chip->dev); |
Andy Shevchenko | 2540f74 | 2014-09-23 17:18:13 +0300 | [diff] [blame] | 249 | dw_dma_disable(chip); |
Andy Shevchenko | 3214658 | 2015-12-04 23:49:23 +0200 | [diff] [blame] | 250 | pm_runtime_put_sync_suspend(chip->dev); |
| 251 | |
Andy Shevchenko | a15636e | 2014-08-19 20:29:17 +0300 | [diff] [blame] | 252 | clk_disable_unprepare(chip->clk); |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | #ifdef CONFIG_OF |
| 256 | static const struct of_device_id dw_dma_of_id_table[] = { |
| 257 | { .compatible = "snps,dma-spear1340" }, |
| 258 | {} |
| 259 | }; |
| 260 | MODULE_DEVICE_TABLE(of, dw_dma_of_id_table); |
| 261 | #endif |
| 262 | |
| 263 | #ifdef CONFIG_ACPI |
| 264 | static const struct acpi_device_id dw_dma_acpi_id_table[] = { |
Andy Shevchenko | bc0bb1f | 2015-12-04 23:49:25 +0200 | [diff] [blame] | 265 | { "INTL9C60", 0 }, |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 266 | { } |
| 267 | }; |
Andy Shevchenko | be480dc | 2013-07-15 15:04:37 +0300 | [diff] [blame] | 268 | MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table); |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 269 | #endif |
| 270 | |
| 271 | #ifdef CONFIG_PM_SLEEP |
| 272 | |
Andy Shevchenko | 067bd4f | 2014-04-15 16:18:41 +0300 | [diff] [blame] | 273 | static int dw_suspend_late(struct device *dev) |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 274 | { |
| 275 | struct platform_device *pdev = to_platform_device(dev); |
| 276 | struct dw_dma_chip *chip = platform_get_drvdata(pdev); |
| 277 | |
Andy Shevchenko | 2540f74 | 2014-09-23 17:18:13 +0300 | [diff] [blame] | 278 | dw_dma_disable(chip); |
Andy Shevchenko | a15636e | 2014-08-19 20:29:17 +0300 | [diff] [blame] | 279 | clk_disable_unprepare(chip->clk); |
| 280 | |
| 281 | return 0; |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 282 | } |
| 283 | |
Andy Shevchenko | 067bd4f | 2014-04-15 16:18:41 +0300 | [diff] [blame] | 284 | static int dw_resume_early(struct device *dev) |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 285 | { |
| 286 | struct platform_device *pdev = to_platform_device(dev); |
| 287 | struct dw_dma_chip *chip = platform_get_drvdata(pdev); |
| 288 | |
Andy Shevchenko | a15636e | 2014-08-19 20:29:17 +0300 | [diff] [blame] | 289 | clk_prepare_enable(chip->clk); |
Andy Shevchenko | 2540f74 | 2014-09-23 17:18:13 +0300 | [diff] [blame] | 290 | return dw_dma_enable(chip); |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 291 | } |
| 292 | |
Andy Shevchenko | 067bd4f | 2014-04-15 16:18:41 +0300 | [diff] [blame] | 293 | #endif /* CONFIG_PM_SLEEP */ |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 294 | |
| 295 | static const struct dev_pm_ops dw_dev_pm_ops = { |
Andy Shevchenko | 067bd4f | 2014-04-15 16:18:41 +0300 | [diff] [blame] | 296 | SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_suspend_late, dw_resume_early) |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 297 | }; |
| 298 | |
| 299 | static struct platform_driver dw_driver = { |
| 300 | .probe = dw_probe, |
| 301 | .remove = dw_remove, |
Andy Shevchenko | 2540f74 | 2014-09-23 17:18:13 +0300 | [diff] [blame] | 302 | .shutdown = dw_shutdown, |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 303 | .driver = { |
Andy Shevchenko | a104a45 | 2015-03-09 12:16:42 +0200 | [diff] [blame] | 304 | .name = DRV_NAME, |
Andy Shevchenko | 9cade1a | 2013-06-05 15:26:45 +0300 | [diff] [blame] | 305 | .pm = &dw_dev_pm_ops, |
| 306 | .of_match_table = of_match_ptr(dw_dma_of_id_table), |
| 307 | .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table), |
| 308 | }, |
| 309 | }; |
| 310 | |
| 311 | static int __init dw_init(void) |
| 312 | { |
| 313 | return platform_driver_register(&dw_driver); |
| 314 | } |
| 315 | subsys_initcall(dw_init); |
| 316 | |
| 317 | static void __exit dw_exit(void) |
| 318 | { |
| 319 | platform_driver_unregister(&dw_driver); |
| 320 | } |
| 321 | module_exit(dw_exit); |
| 322 | |
| 323 | MODULE_LICENSE("GPL v2"); |
| 324 | MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver"); |
Andy Shevchenko | a104a45 | 2015-03-09 12:16:42 +0200 | [diff] [blame] | 325 | MODULE_ALIAS("platform:" DRV_NAME); |