soundwire: sysfs: add slave status and device number before probe
[linux-2.6-microblaze.git] / drivers / misc / habanalabs / common / pci.c
1 // SPDX-License-Identifier: GPL-2.0
2
3 /*
4  * Copyright 2016-2019 HabanaLabs, Ltd.
5  * All Rights Reserved.
6  */
7
8 #include "habanalabs.h"
9 #include "../include/hw_ip/pci/pci_general.h"
10
11 #include <linux/pci.h>
12 #include <linux/bitfield.h>
13
14 #define HL_PLDM_PCI_ELBI_TIMEOUT_MSEC   (HL_PCI_ELBI_TIMEOUT_MSEC * 10)
15
16 #define IATU_REGION_CTRL_REGION_EN_MASK         BIT(31)
17 #define IATU_REGION_CTRL_MATCH_MODE_MASK        BIT(30)
18 #define IATU_REGION_CTRL_NUM_MATCH_EN_MASK      BIT(19)
19 #define IATU_REGION_CTRL_BAR_NUM_MASK           GENMASK(10, 8)
20
21 /**
22  * hl_pci_bars_map() - Map PCI BARs.
23  * @hdev: Pointer to hl_device structure.
24  * @name: Array of BAR names.
25  * @is_wc: Array with flag per BAR whether a write-combined mapping is needed.
26  *
27  * Request PCI regions and map them to kernel virtual addresses.
28  *
29  * Return: 0 on success, non-zero for failure.
30  */
31 int hl_pci_bars_map(struct hl_device *hdev, const char * const name[3],
32                         bool is_wc[3])
33 {
34         struct pci_dev *pdev = hdev->pdev;
35         int rc, i, bar;
36
37         rc = pci_request_regions(pdev, HL_NAME);
38         if (rc) {
39                 dev_err(hdev->dev, "Cannot obtain PCI resources\n");
40                 return rc;
41         }
42
43         for (i = 0 ; i < 3 ; i++) {
44                 bar = i * 2; /* 64-bit BARs */
45                 hdev->pcie_bar[bar] = is_wc[i] ?
46                                 pci_ioremap_wc_bar(pdev, bar) :
47                                 pci_ioremap_bar(pdev, bar);
48                 if (!hdev->pcie_bar[bar]) {
49                         dev_err(hdev->dev, "pci_ioremap%s_bar failed for %s\n",
50                                         is_wc[i] ? "_wc" : "", name[i]);
51                         rc = -ENODEV;
52                         goto err;
53                 }
54         }
55
56         return 0;
57
58 err:
59         for (i = 2 ; i >= 0 ; i--) {
60                 bar = i * 2; /* 64-bit BARs */
61                 if (hdev->pcie_bar[bar])
62                         iounmap(hdev->pcie_bar[bar]);
63         }
64
65         pci_release_regions(pdev);
66
67         return rc;
68 }
69
70 /**
71  * hl_pci_bars_unmap() - Unmap PCI BARS.
72  * @hdev: Pointer to hl_device structure.
73  *
74  * Release all PCI BARs and unmap their virtual addresses.
75  */
76 static void hl_pci_bars_unmap(struct hl_device *hdev)
77 {
78         struct pci_dev *pdev = hdev->pdev;
79         int i, bar;
80
81         for (i = 2 ; i >= 0 ; i--) {
82                 bar = i * 2; /* 64-bit BARs */
83                 iounmap(hdev->pcie_bar[bar]);
84         }
85
86         pci_release_regions(pdev);
87 }
88
89 /**
90  * hl_pci_elbi_write() - Write through the ELBI interface.
91  * @hdev: Pointer to hl_device structure.
92  * @addr: Address to write to
93  * @data: Data to write
94  *
95  * Return: 0 on success, negative value for failure.
96  */
97 static int hl_pci_elbi_write(struct hl_device *hdev, u64 addr, u32 data)
98 {
99         struct pci_dev *pdev = hdev->pdev;
100         ktime_t timeout;
101         u64 msec;
102         u32 val;
103
104         if (hdev->pldm)
105                 msec = HL_PLDM_PCI_ELBI_TIMEOUT_MSEC;
106         else
107                 msec = HL_PCI_ELBI_TIMEOUT_MSEC;
108
109         /* Clear previous status */
110         pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_STS, 0);
111
112         pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_ADDR, (u32) addr);
113         pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_DATA, data);
114         pci_write_config_dword(pdev, mmPCI_CONFIG_ELBI_CTRL,
115                                 PCI_CONFIG_ELBI_CTRL_WRITE);
116
117         timeout = ktime_add_ms(ktime_get(), msec);
118         for (;;) {
119                 pci_read_config_dword(pdev, mmPCI_CONFIG_ELBI_STS, &val);
120                 if (val & PCI_CONFIG_ELBI_STS_MASK)
121                         break;
122                 if (ktime_compare(ktime_get(), timeout) > 0) {
123                         pci_read_config_dword(pdev, mmPCI_CONFIG_ELBI_STS,
124                                                 &val);
125                         break;
126                 }
127
128                 usleep_range(300, 500);
129         }
130
131         if ((val & PCI_CONFIG_ELBI_STS_MASK) == PCI_CONFIG_ELBI_STS_DONE)
132                 return 0;
133
134         if (val & PCI_CONFIG_ELBI_STS_ERR) {
135                 dev_err(hdev->dev, "Error writing to ELBI\n");
136                 return -EIO;
137         }
138
139         if (!(val & PCI_CONFIG_ELBI_STS_MASK)) {
140                 dev_err(hdev->dev, "ELBI write didn't finish in time\n");
141                 return -EIO;
142         }
143
144         dev_err(hdev->dev, "ELBI write has undefined bits in status\n");
145         return -EIO;
146 }
147
148 /**
149  * hl_pci_iatu_write() - iatu write routine.
150  * @hdev: Pointer to hl_device structure.
151  * @addr: Address to write to
152  * @data: Data to write
153  *
154  * Return: 0 on success, negative value for failure.
155  */
156 int hl_pci_iatu_write(struct hl_device *hdev, u32 addr, u32 data)
157 {
158         struct asic_fixed_properties *prop = &hdev->asic_prop;
159         u32 dbi_offset;
160         int rc;
161
162         dbi_offset = addr & 0xFFF;
163
164         rc = hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr, 0x00300000);
165         rc |= hl_pci_elbi_write(hdev, prop->pcie_dbi_base_address + dbi_offset,
166                                 data);
167
168         if (rc)
169                 return -EIO;
170
171         return 0;
172 }
173
174 /**
175  * hl_pci_reset_link_through_bridge() - Reset PCI link.
176  * @hdev: Pointer to hl_device structure.
177  */
178 static void hl_pci_reset_link_through_bridge(struct hl_device *hdev)
179 {
180         struct pci_dev *pdev = hdev->pdev;
181         struct pci_dev *parent_port;
182         u16 val;
183
184         parent_port = pdev->bus->self;
185         pci_read_config_word(parent_port, PCI_BRIDGE_CONTROL, &val);
186         val |= PCI_BRIDGE_CTL_BUS_RESET;
187         pci_write_config_word(parent_port, PCI_BRIDGE_CONTROL, val);
188         ssleep(1);
189
190         val &= ~(PCI_BRIDGE_CTL_BUS_RESET);
191         pci_write_config_word(parent_port, PCI_BRIDGE_CONTROL, val);
192         ssleep(3);
193 }
194
195 /**
196  * hl_pci_set_inbound_region() - Configure inbound region
197  * @hdev: Pointer to hl_device structure.
198  * @region: Inbound region number.
199  * @pci_region: Inbound region parameters.
200  *
201  * Configure the iATU inbound region.
202  *
203  * Return: 0 on success, negative value for failure.
204  */
205 int hl_pci_set_inbound_region(struct hl_device *hdev, u8 region,
206                 struct hl_inbound_pci_region *pci_region)
207 {
208         struct asic_fixed_properties *prop = &hdev->asic_prop;
209         u64 bar_phys_base, region_base, region_end_address;
210         u32 offset, ctrl_reg_val;
211         int rc = 0;
212
213         /* region offset */
214         offset = (0x200 * region) + 0x100;
215
216         if (pci_region->mode == PCI_ADDRESS_MATCH_MODE) {
217                 bar_phys_base = hdev->pcie_bar_phys[pci_region->bar];
218                 region_base = bar_phys_base + pci_region->offset_in_bar;
219                 region_end_address = region_base + pci_region->size - 1;
220
221                 rc |= hl_pci_iatu_write(hdev, offset + 0x8,
222                                 lower_32_bits(region_base));
223                 rc |= hl_pci_iatu_write(hdev, offset + 0xC,
224                                 upper_32_bits(region_base));
225                 rc |= hl_pci_iatu_write(hdev, offset + 0x10,
226                                 lower_32_bits(region_end_address));
227         }
228
229         /* Point to the specified address */
230         rc = hl_pci_iatu_write(hdev, offset + 0x14,
231                         lower_32_bits(pci_region->addr));
232         rc |= hl_pci_iatu_write(hdev, offset + 0x18,
233                         upper_32_bits(pci_region->addr));
234         rc |= hl_pci_iatu_write(hdev, offset + 0x0, 0);
235
236         /* Enable + bar/address match + match enable + bar number */
237         ctrl_reg_val = FIELD_PREP(IATU_REGION_CTRL_REGION_EN_MASK, 1);
238         ctrl_reg_val |= FIELD_PREP(IATU_REGION_CTRL_MATCH_MODE_MASK,
239                         pci_region->mode);
240         ctrl_reg_val |= FIELD_PREP(IATU_REGION_CTRL_NUM_MATCH_EN_MASK, 1);
241
242         if (pci_region->mode == PCI_BAR_MATCH_MODE)
243                 ctrl_reg_val |= FIELD_PREP(IATU_REGION_CTRL_BAR_NUM_MASK,
244                                 pci_region->bar);
245
246         rc |= hl_pci_iatu_write(hdev, offset + 0x4, ctrl_reg_val);
247
248         /* Return the DBI window to the default location */
249         rc |= hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr, 0);
250         rc |= hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr + 4, 0);
251
252         if (rc)
253                 dev_err(hdev->dev, "failed to map bar %u to 0x%08llx\n",
254                                 pci_region->bar, pci_region->addr);
255
256         return rc;
257 }
258
259 /**
260  * hl_pci_set_outbound_region() - Configure outbound region 0
261  * @hdev: Pointer to hl_device structure.
262  * @pci_region: Outbound region parameters.
263  *
264  * Configure the iATU outbound region 0.
265  *
266  * Return: 0 on success, negative value for failure.
267  */
268 int hl_pci_set_outbound_region(struct hl_device *hdev,
269                 struct hl_outbound_pci_region *pci_region)
270 {
271         struct asic_fixed_properties *prop = &hdev->asic_prop;
272         u64 outbound_region_end_address;
273         int rc = 0;
274
275         /* Outbound Region 0 */
276         outbound_region_end_address =
277                         pci_region->addr + pci_region->size - 1;
278         rc |= hl_pci_iatu_write(hdev, 0x008,
279                                 lower_32_bits(pci_region->addr));
280         rc |= hl_pci_iatu_write(hdev, 0x00C,
281                                 upper_32_bits(pci_region->addr));
282         rc |= hl_pci_iatu_write(hdev, 0x010,
283                                 lower_32_bits(outbound_region_end_address));
284         rc |= hl_pci_iatu_write(hdev, 0x014, 0);
285
286         if ((hdev->power9_64bit_dma_enable) && (hdev->dma_mask == 64))
287                 rc |= hl_pci_iatu_write(hdev, 0x018, 0x08000000);
288         else
289                 rc |= hl_pci_iatu_write(hdev, 0x018, 0);
290
291         rc |= hl_pci_iatu_write(hdev, 0x020,
292                                 upper_32_bits(outbound_region_end_address));
293         /* Increase region size */
294         rc |= hl_pci_iatu_write(hdev, 0x000, 0x00002000);
295         /* Enable */
296         rc |= hl_pci_iatu_write(hdev, 0x004, 0x80000000);
297
298         /* Return the DBI window to the default location */
299         rc |= hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr, 0);
300         rc |= hl_pci_elbi_write(hdev, prop->pcie_aux_dbi_reg_addr + 4, 0);
301
302         return rc;
303 }
304
305 /**
306  * hl_pci_set_dma_mask() - Set DMA masks for the device.
307  * @hdev: Pointer to hl_device structure.
308  *
309  * This function sets the DMA masks (regular and consistent) for a specified
310  * value. If it doesn't succeed, it tries to set it to a fall-back value
311  *
312  * Return: 0 on success, non-zero for failure.
313  */
314 static int hl_pci_set_dma_mask(struct hl_device *hdev)
315 {
316         struct pci_dev *pdev = hdev->pdev;
317         int rc;
318
319         /* set DMA mask */
320         rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(hdev->dma_mask));
321         if (rc) {
322                 dev_err(hdev->dev,
323                         "Failed to set pci dma mask to %d bits, error %d\n",
324                         hdev->dma_mask, rc);
325                 return rc;
326         }
327
328         rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(hdev->dma_mask));
329         if (rc) {
330                 dev_err(hdev->dev,
331                         "Failed to set pci consistent dma mask to %d bits, error %d\n",
332                         hdev->dma_mask, rc);
333                 return rc;
334         }
335
336         return 0;
337 }
338
339 /**
340  * hl_pci_init() - PCI initialization code.
341  * @hdev: Pointer to hl_device structure.
342  *
343  * Set DMA masks, initialize the PCI controller and map the PCI BARs.
344  *
345  * Return: 0 on success, non-zero for failure.
346  */
347 int hl_pci_init(struct hl_device *hdev)
348 {
349         struct pci_dev *pdev = hdev->pdev;
350         int rc;
351
352         if (hdev->reset_pcilink)
353                 hl_pci_reset_link_through_bridge(hdev);
354
355         rc = pci_enable_device_mem(pdev);
356         if (rc) {
357                 dev_err(hdev->dev, "can't enable PCI device\n");
358                 return rc;
359         }
360
361         pci_set_master(pdev);
362
363         rc = hdev->asic_funcs->pci_bars_map(hdev);
364         if (rc) {
365                 dev_err(hdev->dev, "Failed to initialize PCI BARs\n");
366                 goto disable_device;
367         }
368
369         rc = hdev->asic_funcs->init_iatu(hdev);
370         if (rc) {
371                 dev_err(hdev->dev, "Failed to initialize iATU\n");
372                 goto disable_device;
373         }
374
375         rc = hl_pci_set_dma_mask(hdev);
376         if (rc)
377                 goto disable_device;
378
379         return 0;
380
381 disable_device:
382         pci_clear_master(pdev);
383         pci_disable_device(pdev);
384
385         return rc;
386 }
387
388 /**
389  * hl_fw_fini() - PCI finalization code.
390  * @hdev: Pointer to hl_device structure
391  *
392  * Unmap PCI bars and disable PCI device.
393  */
394 void hl_pci_fini(struct hl_device *hdev)
395 {
396         hl_pci_bars_unmap(hdev);
397
398         pci_clear_master(hdev->pdev);
399         pci_disable_device(hdev->pdev);
400 }