1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates.
4 * Synopsys DesignWare eDMA PCIe driver
5 *
6 * Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/pci.h>
12 #include <linux/device.h>
13 #include <linux/dma/edma.h>
14 #include <linux/pci-epf.h>
15 #include <linux/msi.h>
16 #include <linux/bitfield.h>
17
18 #include "dw-edma-core.h"
19
20 #define DW_PCIE_VSEC_DMA_ID 0x6
21 #define DW_PCIE_VSEC_DMA_BAR GENMASK(10, 8)
22 #define DW_PCIE_VSEC_DMA_MAP GENMASK(2, 0)
23 #define DW_PCIE_VSEC_DMA_WR_CH GENMASK(9, 0)
24 #define DW_PCIE_VSEC_DMA_RD_CH GENMASK(25, 16)
25
26 #define DW_BLOCK(a, b, c) \
27 { \
28 .bar = a, \
29 .off = b, \
30 .sz = c, \
31 },
32
33 struct dw_edma_block {
34 enum pci_barno bar;
35 off_t off;
36 size_t sz;
37 };
38
39 struct dw_edma_pcie_data {
40 /* eDMA registers location */
41 struct dw_edma_block rg;
42 /* eDMA memory linked list location */
43 struct dw_edma_block ll_wr[EDMA_MAX_WR_CH];
44 struct dw_edma_block ll_rd[EDMA_MAX_RD_CH];
45 /* eDMA memory data location */
46 struct dw_edma_block dt_wr[EDMA_MAX_WR_CH];
47 struct dw_edma_block dt_rd[EDMA_MAX_RD_CH];
48 /* Other */
49 enum dw_edma_map_format mf;
50 u8 irqs;
51 u16 wr_ch_cnt;
52 u16 rd_ch_cnt;
53 };
54
55 static const struct dw_edma_pcie_data snps_edda_data = {
56 /* eDMA registers location */
57 .rg.bar = BAR_0,
58 .rg.off = 0x00001000, /* 4 Kbytes */
59 .rg.sz = 0x00002000, /* 8 Kbytes */
60 /* eDMA memory linked list location */
61 .ll_wr = {
62 /* Channel 0 - BAR 2, offset 0 Mbytes, size 2 Kbytes */
63 DW_BLOCK(BAR_2, 0x00000000, 0x00000800)
64 /* Channel 1 - BAR 2, offset 2 Mbytes, size 2 Kbytes */
65 DW_BLOCK(BAR_2, 0x00200000, 0x00000800)
66 },
67 .ll_rd = {
68 /* Channel 0 - BAR 2, offset 4 Mbytes, size 2 Kbytes */
69 DW_BLOCK(BAR_2, 0x00400000, 0x00000800)
70 /* Channel 1 - BAR 2, offset 6 Mbytes, size 2 Kbytes */
71 DW_BLOCK(BAR_2, 0x00600000, 0x00000800)
72 },
73 /* eDMA memory data location */
74 .dt_wr = {
75 /* Channel 0 - BAR 2, offset 8 Mbytes, size 2 Kbytes */
76 DW_BLOCK(BAR_2, 0x00800000, 0x00000800)
77 /* Channel 1 - BAR 2, offset 9 Mbytes, size 2 Kbytes */
78 DW_BLOCK(BAR_2, 0x00900000, 0x00000800)
79 },
80 .dt_rd = {
81 /* Channel 0 - BAR 2, offset 10 Mbytes, size 2 Kbytes */
82 DW_BLOCK(BAR_2, 0x00a00000, 0x00000800)
83 /* Channel 1 - BAR 2, offset 11 Mbytes, size 2 Kbytes */
84 DW_BLOCK(BAR_2, 0x00b00000, 0x00000800)
85 },
86 /* Other */
87 .mf = EDMA_MF_EDMA_UNROLL,
88 .irqs = 1,
89 .wr_ch_cnt = 2,
90 .rd_ch_cnt = 2,
91 };
92
dw_edma_pcie_irq_vector(struct device * dev,unsigned int nr)93 static int dw_edma_pcie_irq_vector(struct device *dev, unsigned int nr)
94 {
95 return pci_irq_vector(to_pci_dev(dev), nr);
96 }
97
dw_edma_pcie_address(struct device * dev,phys_addr_t cpu_addr)98 static u64 dw_edma_pcie_address(struct device *dev, phys_addr_t cpu_addr)
99 {
100 struct pci_dev *pdev = to_pci_dev(dev);
101 struct pci_bus_region region;
102 struct resource res = {
103 .flags = IORESOURCE_MEM,
104 .start = cpu_addr,
105 .end = cpu_addr,
106 };
107
108 pcibios_resource_to_bus(pdev->bus, ®ion, &res);
109 return region.start;
110 }
111
112 static const struct dw_edma_plat_ops dw_edma_pcie_plat_ops = {
113 .irq_vector = dw_edma_pcie_irq_vector,
114 .pci_address = dw_edma_pcie_address,
115 };
116
dw_edma_pcie_get_vsec_dma_data(struct pci_dev * pdev,struct dw_edma_pcie_data * pdata)117 static void dw_edma_pcie_get_vsec_dma_data(struct pci_dev *pdev,
118 struct dw_edma_pcie_data *pdata)
119 {
120 u32 val, map;
121 u16 vsec;
122 u64 off;
123
124 vsec = pci_find_vsec_capability(pdev, PCI_VENDOR_ID_SYNOPSYS,
125 DW_PCIE_VSEC_DMA_ID);
126 if (!vsec)
127 return;
128
129 pci_read_config_dword(pdev, vsec + PCI_VNDR_HEADER, &val);
130 if (PCI_VNDR_HEADER_REV(val) != 0x00 ||
131 PCI_VNDR_HEADER_LEN(val) != 0x18)
132 return;
133
134 pci_dbg(pdev, "Detected PCIe Vendor-Specific Extended Capability DMA\n");
135 pci_read_config_dword(pdev, vsec + 0x8, &val);
136 map = FIELD_GET(DW_PCIE_VSEC_DMA_MAP, val);
137 if (map != EDMA_MF_EDMA_LEGACY &&
138 map != EDMA_MF_EDMA_UNROLL &&
139 map != EDMA_MF_HDMA_COMPAT)
140 return;
141
142 pdata->mf = map;
143 pdata->rg.bar = FIELD_GET(DW_PCIE_VSEC_DMA_BAR, val);
144
145 pci_read_config_dword(pdev, vsec + 0xc, &val);
146 pdata->wr_ch_cnt = min_t(u16, pdata->wr_ch_cnt,
147 FIELD_GET(DW_PCIE_VSEC_DMA_WR_CH, val));
148 pdata->rd_ch_cnt = min_t(u16, pdata->rd_ch_cnt,
149 FIELD_GET(DW_PCIE_VSEC_DMA_RD_CH, val));
150
151 pci_read_config_dword(pdev, vsec + 0x14, &val);
152 off = val;
153 pci_read_config_dword(pdev, vsec + 0x10, &val);
154 off <<= 32;
155 off |= val;
156 pdata->rg.off = off;
157 }
158
dw_edma_pcie_probe(struct pci_dev * pdev,const struct pci_device_id * pid)159 static int dw_edma_pcie_probe(struct pci_dev *pdev,
160 const struct pci_device_id *pid)
161 {
162 struct dw_edma_pcie_data *pdata = (void *)pid->driver_data;
163 struct dw_edma_pcie_data vsec_data;
164 struct device *dev = &pdev->dev;
165 struct dw_edma_chip *chip;
166 int err, nr_irqs;
167 int i, mask;
168
169 /* Enable PCI device */
170 err = pcim_enable_device(pdev);
171 if (err) {
172 pci_err(pdev, "enabling device failed\n");
173 return err;
174 }
175
176 memcpy(&vsec_data, pdata, sizeof(struct dw_edma_pcie_data));
177
178 /*
179 * Tries to find if exists a PCIe Vendor-Specific Extended Capability
180 * for the DMA, if one exists, then reconfigures it.
181 */
182 dw_edma_pcie_get_vsec_dma_data(pdev, &vsec_data);
183
184 /* Mapping PCI BAR regions */
185 mask = BIT(vsec_data.rg.bar);
186 for (i = 0; i < vsec_data.wr_ch_cnt; i++) {
187 mask |= BIT(vsec_data.ll_wr[i].bar);
188 mask |= BIT(vsec_data.dt_wr[i].bar);
189 }
190 for (i = 0; i < vsec_data.rd_ch_cnt; i++) {
191 mask |= BIT(vsec_data.ll_rd[i].bar);
192 mask |= BIT(vsec_data.dt_rd[i].bar);
193 }
194 err = pcim_iomap_regions(pdev, mask, pci_name(pdev));
195 if (err) {
196 pci_err(pdev, "eDMA BAR I/O remapping failed\n");
197 return err;
198 }
199
200 pci_set_master(pdev);
201
202 /* DMA configuration */
203 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
204 if (err) {
205 pci_err(pdev, "DMA mask 64 set failed\n");
206 return err;
207 }
208
209 /* Data structure allocation */
210 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
211 if (!chip)
212 return -ENOMEM;
213
214 /* IRQs allocation */
215 nr_irqs = pci_alloc_irq_vectors(pdev, 1, vsec_data.irqs,
216 PCI_IRQ_MSI | PCI_IRQ_MSIX);
217 if (nr_irqs < 1) {
218 pci_err(pdev, "fail to alloc IRQ vector (number of IRQs=%u)\n",
219 nr_irqs);
220 return -EPERM;
221 }
222
223 /* Data structure initialization */
224 chip->dev = dev;
225
226 chip->mf = vsec_data.mf;
227 chip->nr_irqs = nr_irqs;
228 chip->ops = &dw_edma_pcie_plat_ops;
229
230 chip->ll_wr_cnt = vsec_data.wr_ch_cnt;
231 chip->ll_rd_cnt = vsec_data.rd_ch_cnt;
232
233 chip->reg_base = pcim_iomap_table(pdev)[vsec_data.rg.bar];
234 if (!chip->reg_base)
235 return -ENOMEM;
236
237 for (i = 0; i < chip->ll_wr_cnt; i++) {
238 struct dw_edma_region *ll_region = &chip->ll_region_wr[i];
239 struct dw_edma_region *dt_region = &chip->dt_region_wr[i];
240 struct dw_edma_block *ll_block = &vsec_data.ll_wr[i];
241 struct dw_edma_block *dt_block = &vsec_data.dt_wr[i];
242
243 ll_region->vaddr.io = pcim_iomap_table(pdev)[ll_block->bar];
244 if (!ll_region->vaddr.io)
245 return -ENOMEM;
246
247 ll_region->vaddr.io += ll_block->off;
248 ll_region->paddr = pci_bus_address(pdev, ll_block->bar);
249 ll_region->paddr += ll_block->off;
250 ll_region->sz = ll_block->sz;
251
252 dt_region->vaddr.io = pcim_iomap_table(pdev)[dt_block->bar];
253 if (!dt_region->vaddr.io)
254 return -ENOMEM;
255
256 dt_region->vaddr.io += dt_block->off;
257 dt_region->paddr = pci_bus_address(pdev, dt_block->bar);
258 dt_region->paddr += dt_block->off;
259 dt_region->sz = dt_block->sz;
260 }
261
262 for (i = 0; i < chip->ll_rd_cnt; i++) {
263 struct dw_edma_region *ll_region = &chip->ll_region_rd[i];
264 struct dw_edma_region *dt_region = &chip->dt_region_rd[i];
265 struct dw_edma_block *ll_block = &vsec_data.ll_rd[i];
266 struct dw_edma_block *dt_block = &vsec_data.dt_rd[i];
267
268 ll_region->vaddr.io = pcim_iomap_table(pdev)[ll_block->bar];
269 if (!ll_region->vaddr.io)
270 return -ENOMEM;
271
272 ll_region->vaddr.io += ll_block->off;
273 ll_region->paddr = pci_bus_address(pdev, ll_block->bar);
274 ll_region->paddr += ll_block->off;
275 ll_region->sz = ll_block->sz;
276
277 dt_region->vaddr.io = pcim_iomap_table(pdev)[dt_block->bar];
278 if (!dt_region->vaddr.io)
279 return -ENOMEM;
280
281 dt_region->vaddr.io += dt_block->off;
282 dt_region->paddr = pci_bus_address(pdev, dt_block->bar);
283 dt_region->paddr += dt_block->off;
284 dt_region->sz = dt_block->sz;
285 }
286
287 /* Debug info */
288 if (chip->mf == EDMA_MF_EDMA_LEGACY)
289 pci_dbg(pdev, "Version:\teDMA Port Logic (0x%x)\n", chip->mf);
290 else if (chip->mf == EDMA_MF_EDMA_UNROLL)
291 pci_dbg(pdev, "Version:\teDMA Unroll (0x%x)\n", chip->mf);
292 else if (chip->mf == EDMA_MF_HDMA_COMPAT)
293 pci_dbg(pdev, "Version:\tHDMA Compatible (0x%x)\n", chip->mf);
294 else
295 pci_dbg(pdev, "Version:\tUnknown (0x%x)\n", chip->mf);
296
297 pci_dbg(pdev, "Registers:\tBAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p)\n",
298 vsec_data.rg.bar, vsec_data.rg.off, vsec_data.rg.sz,
299 chip->reg_base);
300
301
302 for (i = 0; i < chip->ll_wr_cnt; i++) {
303 pci_dbg(pdev, "L. List:\tWRITE CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
304 i, vsec_data.ll_wr[i].bar,
305 vsec_data.ll_wr[i].off, chip->ll_region_wr[i].sz,
306 chip->ll_region_wr[i].vaddr.io, &chip->ll_region_wr[i].paddr);
307
308 pci_dbg(pdev, "Data:\tWRITE CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
309 i, vsec_data.dt_wr[i].bar,
310 vsec_data.dt_wr[i].off, chip->dt_region_wr[i].sz,
311 chip->dt_region_wr[i].vaddr.io, &chip->dt_region_wr[i].paddr);
312 }
313
314 for (i = 0; i < chip->ll_rd_cnt; i++) {
315 pci_dbg(pdev, "L. List:\tREAD CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
316 i, vsec_data.ll_rd[i].bar,
317 vsec_data.ll_rd[i].off, chip->ll_region_rd[i].sz,
318 chip->ll_region_rd[i].vaddr.io, &chip->ll_region_rd[i].paddr);
319
320 pci_dbg(pdev, "Data:\tREAD CH%.2u, BAR=%u, off=0x%.8lx, sz=0x%zx bytes, addr(v=%p, p=%pa)\n",
321 i, vsec_data.dt_rd[i].bar,
322 vsec_data.dt_rd[i].off, chip->dt_region_rd[i].sz,
323 chip->dt_region_rd[i].vaddr.io, &chip->dt_region_rd[i].paddr);
324 }
325
326 pci_dbg(pdev, "Nr. IRQs:\t%u\n", chip->nr_irqs);
327
328 /* Validating if PCI interrupts were enabled */
329 if (!pci_dev_msi_enabled(pdev)) {
330 pci_err(pdev, "enable interrupt failed\n");
331 return -EPERM;
332 }
333
334 /* Starting eDMA driver */
335 err = dw_edma_probe(chip);
336 if (err) {
337 pci_err(pdev, "eDMA probe failed\n");
338 return err;
339 }
340
341 /* Saving data structure reference */
342 pci_set_drvdata(pdev, chip);
343
344 return 0;
345 }
346
dw_edma_pcie_remove(struct pci_dev * pdev)347 static void dw_edma_pcie_remove(struct pci_dev *pdev)
348 {
349 struct dw_edma_chip *chip = pci_get_drvdata(pdev);
350 int err;
351
352 /* Stopping eDMA driver */
353 err = dw_edma_remove(chip);
354 if (err)
355 pci_warn(pdev, "can't remove device properly: %d\n", err);
356
357 /* Freeing IRQs */
358 pci_free_irq_vectors(pdev);
359 }
360
361 static const struct pci_device_id dw_edma_pcie_id_table[] = {
362 { PCI_DEVICE_DATA(SYNOPSYS, EDDA, &snps_edda_data) },
363 { }
364 };
365 MODULE_DEVICE_TABLE(pci, dw_edma_pcie_id_table);
366
367 static struct pci_driver dw_edma_pcie_driver = {
368 .name = "dw-edma-pcie",
369 .id_table = dw_edma_pcie_id_table,
370 .probe = dw_edma_pcie_probe,
371 .remove = dw_edma_pcie_remove,
372 };
373
374 module_pci_driver(dw_edma_pcie_driver);
375
376 MODULE_LICENSE("GPL v2");
377 MODULE_DESCRIPTION("Synopsys DesignWare eDMA PCIe driver");
378 MODULE_AUTHOR("Gustavo Pimentel <gustavo.pimentel@synopsys.com>");
379