1 // SPDX-License-Identifier: GPL-2.0-only
3 * FPGA Manager Driver for Altera Arria/Cyclone/Stratix CvP
5 * Copyright (C) 2017 DENX Software Engineering
7 * Anatolij Gustschin <agust@denx.de>
9 * Manage Altera FPGA firmware using PCIe CvP.
10 * Firmware must be in binary "rbf" format.
13 #include <linux/delay.h>
14 #include <linux/device.h>
15 #include <linux/fpga/fpga-mgr.h>
16 #include <linux/module.h>
17 #include <linux/pci.h>
18 #include <linux/sizes.h>
20 #define CVP_BAR 0 /* BAR used for data transfer in memory mode */
21 #define CVP_DUMMY_WR 244 /* dummy writes to clear CvP state machine */
22 #define TIMEOUT_US 2000 /* CVP STATUS timeout for USERMODE polling */
24 /* Vendor Specific Extended Capability Registers */
25 #define VSE_PCIE_EXT_CAP_ID 0x200
26 #define VSE_PCIE_EXT_CAP_ID_VAL 0x000b /* 16bit */
28 #define VSE_CVP_STATUS 0x21c /* 32bit */
29 #define VSE_CVP_STATUS_CFG_RDY BIT(18) /* CVP_CONFIG_READY */
30 #define VSE_CVP_STATUS_CFG_ERR BIT(19) /* CVP_CONFIG_ERROR */
31 #define VSE_CVP_STATUS_CVP_EN BIT(20) /* ctrl block is enabling CVP */
32 #define VSE_CVP_STATUS_USERMODE BIT(21) /* USERMODE */
33 #define VSE_CVP_STATUS_CFG_DONE BIT(23) /* CVP_CONFIG_DONE */
34 #define VSE_CVP_STATUS_PLD_CLK_IN_USE BIT(24) /* PLD_CLK_IN_USE */
36 #define VSE_CVP_MODE_CTRL 0x220 /* 32bit */
37 #define VSE_CVP_MODE_CTRL_CVP_MODE BIT(0) /* CVP (1) or normal mode (0) */
38 #define VSE_CVP_MODE_CTRL_HIP_CLK_SEL BIT(1) /* PMA (1) or fabric clock (0) */
39 #define VSE_CVP_MODE_CTRL_NUMCLKS_OFF 8 /* NUMCLKS bits offset */
40 #define VSE_CVP_MODE_CTRL_NUMCLKS_MASK GENMASK(15, 8)
42 #define VSE_CVP_DATA 0x228 /* 32bit */
43 #define VSE_CVP_PROG_CTRL 0x22c /* 32bit */
44 #define VSE_CVP_PROG_CTRL_CONFIG BIT(0)
45 #define VSE_CVP_PROG_CTRL_START_XFER BIT(1)
47 #define VSE_UNCOR_ERR_STATUS 0x234 /* 32bit */
48 #define VSE_UNCOR_ERR_CVP_CFG_ERR BIT(5) /* CVP_CONFIG_ERROR_LATCHED */
50 #define DRV_NAME "altera-cvp"
51 #define ALTERA_CVP_MGR_NAME "Altera CvP FPGA Manager"
53 /* Optional CvP config error status check for debugging */
54 static bool altera_cvp_chkcfg;
56 struct altera_cvp_conf {
57 struct fpga_manager *mgr;
58 struct pci_dev *pci_dev;
60 void (*write_data)(struct altera_cvp_conf *conf,
66 static enum fpga_mgr_states altera_cvp_state(struct fpga_manager *mgr)
68 struct altera_cvp_conf *conf = mgr->priv;
71 pci_read_config_dword(conf->pci_dev, VSE_CVP_STATUS, &status);
73 if (status & VSE_CVP_STATUS_CFG_DONE)
74 return FPGA_MGR_STATE_OPERATING;
76 if (status & VSE_CVP_STATUS_CVP_EN)
77 return FPGA_MGR_STATE_POWER_UP;
79 return FPGA_MGR_STATE_UNKNOWN;
82 static void altera_cvp_write_data_iomem(struct altera_cvp_conf *conf, u32 val)
84 writel(val, conf->map);
87 static void altera_cvp_write_data_config(struct altera_cvp_conf *conf, u32 val)
89 pci_write_config_dword(conf->pci_dev, VSE_CVP_DATA, val);
92 /* switches between CvP clock and internal clock */
93 static void altera_cvp_dummy_write(struct altera_cvp_conf *conf)
98 /* set 1 CVP clock cycle for every CVP Data Register Write */
99 pci_read_config_dword(conf->pci_dev, VSE_CVP_MODE_CTRL, &val);
100 val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK;
101 val |= 1 << VSE_CVP_MODE_CTRL_NUMCLKS_OFF;
102 pci_write_config_dword(conf->pci_dev, VSE_CVP_MODE_CTRL, val);
104 for (i = 0; i < CVP_DUMMY_WR; i++)
105 conf->write_data(conf, 0); /* dummy data, could be any value */
108 static int altera_cvp_wait_status(struct altera_cvp_conf *conf, u32 status_mask,
109 u32 status_val, int timeout_us)
111 unsigned int retries;
114 retries = timeout_us / 10;
119 pci_read_config_dword(conf->pci_dev, VSE_CVP_STATUS, &val);
120 if ((val & status_mask) == status_val)
123 /* use small usleep value to re-check and break early */
124 usleep_range(10, 11);
130 static int altera_cvp_teardown(struct fpga_manager *mgr,
131 struct fpga_image_info *info)
133 struct altera_cvp_conf *conf = mgr->priv;
134 struct pci_dev *pdev = conf->pci_dev;
138 /* STEP 12 - reset START_XFER bit */
139 pci_read_config_dword(pdev, VSE_CVP_PROG_CTRL, &val);
140 val &= ~VSE_CVP_PROG_CTRL_START_XFER;
141 pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val);
143 /* STEP 13 - reset CVP_CONFIG bit */
144 val &= ~VSE_CVP_PROG_CTRL_CONFIG;
145 pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val);
149 * - set CVP_NUMCLKS to 1 and then issue CVP_DUMMY_WR dummy
152 altera_cvp_dummy_write(conf); /* from CVP clock to internal clock */
154 /* STEP 15 - poll CVP_CONFIG_READY bit for 0 with 10us timeout */
155 ret = altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY, 0, 10);
157 dev_err(&mgr->dev, "CFG_RDY == 0 timeout\n");
162 static int altera_cvp_write_init(struct fpga_manager *mgr,
163 struct fpga_image_info *info,
164 const char *buf, size_t count)
166 struct altera_cvp_conf *conf = mgr->priv;
167 struct pci_dev *pdev = conf->pci_dev;
171 iflags = info ? info->flags : 0;
173 if (iflags & FPGA_MGR_PARTIAL_RECONFIG) {
174 dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
178 /* Determine allowed clock to data ratio */
179 if (iflags & FPGA_MGR_COMPRESSED_BITSTREAM)
180 conf->numclks = 8; /* ratio for all compressed images */
181 else if (iflags & FPGA_MGR_ENCRYPTED_BITSTREAM)
182 conf->numclks = 4; /* for uncompressed and encrypted images */
184 conf->numclks = 1; /* for uncompressed and unencrypted images */
186 /* STEP 1 - read CVP status and check CVP_EN flag */
187 pci_read_config_dword(pdev, VSE_CVP_STATUS, &val);
188 if (!(val & VSE_CVP_STATUS_CVP_EN)) {
189 dev_err(&mgr->dev, "CVP mode off: 0x%04x\n", val);
193 if (val & VSE_CVP_STATUS_CFG_RDY) {
194 dev_warn(&mgr->dev, "CvP already started, teardown first\n");
195 ret = altera_cvp_teardown(mgr, info);
202 * - set HIP_CLK_SEL and CVP_MODE (must be set in the order mentioned)
204 /* switch from fabric to PMA clock */
205 pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val);
206 val |= VSE_CVP_MODE_CTRL_HIP_CLK_SEL;
207 pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val);
210 pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val);
211 val |= VSE_CVP_MODE_CTRL_CVP_MODE;
212 pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val);
216 * - set CVP_NUMCLKS to 1 and issue CVP_DUMMY_WR dummy writes to the HIP
218 altera_cvp_dummy_write(conf);
220 /* STEP 4 - set CVP_CONFIG bit */
221 pci_read_config_dword(pdev, VSE_CVP_PROG_CTRL, &val);
222 /* request control block to begin transfer using CVP */
223 val |= VSE_CVP_PROG_CTRL_CONFIG;
224 pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val);
226 /* STEP 5 - poll CVP_CONFIG READY for 1 with 10us timeout */
227 ret = altera_cvp_wait_status(conf, VSE_CVP_STATUS_CFG_RDY,
228 VSE_CVP_STATUS_CFG_RDY, 10);
230 dev_warn(&mgr->dev, "CFG_RDY == 1 timeout\n");
236 * - set CVP_NUMCLKS to 1 and issue CVP_DUMMY_WR dummy writes to the HIP
238 altera_cvp_dummy_write(conf);
240 /* STEP 7 - set START_XFER */
241 pci_read_config_dword(pdev, VSE_CVP_PROG_CTRL, &val);
242 val |= VSE_CVP_PROG_CTRL_START_XFER;
243 pci_write_config_dword(pdev, VSE_CVP_PROG_CTRL, val);
245 /* STEP 8 - start transfer (set CVP_NUMCLKS for bitstream) */
246 pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val);
247 val &= ~VSE_CVP_MODE_CTRL_NUMCLKS_MASK;
248 val |= conf->numclks << VSE_CVP_MODE_CTRL_NUMCLKS_OFF;
249 pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val);
254 static inline int altera_cvp_chk_error(struct fpga_manager *mgr, size_t bytes)
256 struct altera_cvp_conf *conf = mgr->priv;
259 /* STEP 10 (optional) - check CVP_CONFIG_ERROR flag */
260 pci_read_config_dword(conf->pci_dev, VSE_CVP_STATUS, &val);
261 if (val & VSE_CVP_STATUS_CFG_ERR) {
262 dev_err(&mgr->dev, "CVP_CONFIG_ERROR after %zu bytes!\n",
269 static int altera_cvp_write(struct fpga_manager *mgr, const char *buf,
272 struct altera_cvp_conf *conf = mgr->priv;
274 size_t done, remaining;
278 /* STEP 9 - write 32-bit data from RBF file to CVP data register */
283 while (remaining >= 4) {
284 conf->write_data(conf, *data++);
289 * STEP 10 (optional) and STEP 11
291 * - loop until data transfer completed
292 * Config images can be huge (more than 40 MiB), so
293 * only check after a new 4k data block has been written.
294 * This reduces the number of checks and speeds up the
295 * configuration process.
297 if (altera_cvp_chkcfg && !(done % SZ_4K)) {
298 status = altera_cvp_chk_error(mgr, done);
304 /* write up to 3 trailing bytes, if any */
305 mask = BIT(remaining * 8) - 1;
307 conf->write_data(conf, *data & mask);
309 if (altera_cvp_chkcfg)
310 status = altera_cvp_chk_error(mgr, count);
315 static int altera_cvp_write_complete(struct fpga_manager *mgr,
316 struct fpga_image_info *info)
318 struct altera_cvp_conf *conf = mgr->priv;
319 struct pci_dev *pdev = conf->pci_dev;
324 ret = altera_cvp_teardown(mgr, info);
328 /* STEP 16 - check CVP_CONFIG_ERROR_LATCHED bit */
329 pci_read_config_dword(pdev, VSE_UNCOR_ERR_STATUS, &val);
330 if (val & VSE_UNCOR_ERR_CVP_CFG_ERR) {
331 dev_err(&mgr->dev, "detected CVP_CONFIG_ERROR_LATCHED!\n");
335 /* STEP 17 - reset CVP_MODE and HIP_CLK_SEL bit */
336 pci_read_config_dword(pdev, VSE_CVP_MODE_CTRL, &val);
337 val &= ~VSE_CVP_MODE_CTRL_HIP_CLK_SEL;
338 val &= ~VSE_CVP_MODE_CTRL_CVP_MODE;
339 pci_write_config_dword(pdev, VSE_CVP_MODE_CTRL, val);
341 /* STEP 18 - poll PLD_CLK_IN_USE and USER_MODE bits */
342 mask = VSE_CVP_STATUS_PLD_CLK_IN_USE | VSE_CVP_STATUS_USERMODE;
343 ret = altera_cvp_wait_status(conf, mask, mask, TIMEOUT_US);
345 dev_err(&mgr->dev, "PLD_CLK_IN_USE|USERMODE timeout\n");
350 static const struct fpga_manager_ops altera_cvp_ops = {
351 .state = altera_cvp_state,
352 .write_init = altera_cvp_write_init,
353 .write = altera_cvp_write,
354 .write_complete = altera_cvp_write_complete,
357 static ssize_t chkcfg_show(struct device_driver *dev, char *buf)
359 return snprintf(buf, 3, "%d\n", altera_cvp_chkcfg);
362 static ssize_t chkcfg_store(struct device_driver *drv, const char *buf,
367 ret = kstrtobool(buf, &altera_cvp_chkcfg);
374 static DRIVER_ATTR_RW(chkcfg);
376 static int altera_cvp_probe(struct pci_dev *pdev,
377 const struct pci_device_id *dev_id);
378 static void altera_cvp_remove(struct pci_dev *pdev);
380 static struct pci_device_id altera_cvp_id_tbl[] = {
381 { PCI_VDEVICE(ALTERA, PCI_ANY_ID) },
384 MODULE_DEVICE_TABLE(pci, altera_cvp_id_tbl);
386 static struct pci_driver altera_cvp_driver = {
388 .id_table = altera_cvp_id_tbl,
389 .probe = altera_cvp_probe,
390 .remove = altera_cvp_remove,
393 static int altera_cvp_probe(struct pci_dev *pdev,
394 const struct pci_device_id *dev_id)
396 struct altera_cvp_conf *conf;
397 struct fpga_manager *mgr;
403 * First check if this is the expected FPGA device. PCI config
404 * space access works without enabling the PCI device, memory
405 * space access is enabled further down.
407 pci_read_config_word(pdev, VSE_PCIE_EXT_CAP_ID, &val);
408 if (val != VSE_PCIE_EXT_CAP_ID_VAL) {
409 dev_err(&pdev->dev, "Wrong EXT_CAP_ID value 0x%x\n", val);
413 pci_read_config_dword(pdev, VSE_CVP_STATUS, ®val);
414 if (!(regval & VSE_CVP_STATUS_CVP_EN)) {
416 "CVP is disabled for this device: CVP_STATUS Reg 0x%x\n",
421 conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL);
426 * Enable memory BAR access. We cannot use pci_enable_device() here
427 * because it will make the driver unusable with FPGA devices that
428 * have additional big IOMEM resources (e.g. 4GiB BARs) on 32-bit
429 * platform. Such BARs will not have an assigned address range and
430 * pci_enable_device() will fail, complaining about not claimed BAR,
431 * even if the concerned BAR is not needed for FPGA configuration
432 * at all. Thus, enable the device via PCI config space command.
434 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
435 if (!(cmd & PCI_COMMAND_MEMORY)) {
436 cmd |= PCI_COMMAND_MEMORY;
437 pci_write_config_word(pdev, PCI_COMMAND, cmd);
440 ret = pci_request_region(pdev, CVP_BAR, "CVP");
442 dev_err(&pdev->dev, "Requesting CVP BAR region failed\n");
446 conf->pci_dev = pdev;
447 conf->write_data = altera_cvp_write_data_iomem;
449 conf->map = pci_iomap(pdev, CVP_BAR, 0);
451 dev_warn(&pdev->dev, "Mapping CVP BAR failed\n");
452 conf->write_data = altera_cvp_write_data_config;
455 snprintf(conf->mgr_name, sizeof(conf->mgr_name), "%s @%s",
456 ALTERA_CVP_MGR_NAME, pci_name(pdev));
458 mgr = devm_fpga_mgr_create(&pdev->dev, conf->mgr_name,
459 &altera_cvp_ops, conf);
465 pci_set_drvdata(pdev, mgr);
467 ret = fpga_mgr_register(mgr);
475 pci_iounmap(pdev, conf->map);
476 pci_release_region(pdev, CVP_BAR);
478 cmd &= ~PCI_COMMAND_MEMORY;
479 pci_write_config_word(pdev, PCI_COMMAND, cmd);
483 static void altera_cvp_remove(struct pci_dev *pdev)
485 struct fpga_manager *mgr = pci_get_drvdata(pdev);
486 struct altera_cvp_conf *conf = mgr->priv;
489 fpga_mgr_unregister(mgr);
491 pci_iounmap(pdev, conf->map);
492 pci_release_region(pdev, CVP_BAR);
493 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
494 cmd &= ~PCI_COMMAND_MEMORY;
495 pci_write_config_word(pdev, PCI_COMMAND, cmd);
498 static int __init altera_cvp_init(void)
502 ret = pci_register_driver(&altera_cvp_driver);
506 ret = driver_create_file(&altera_cvp_driver.driver,
507 &driver_attr_chkcfg);
509 pr_warn("Can't create sysfs chkcfg file\n");
514 static void __exit altera_cvp_exit(void)
516 driver_remove_file(&altera_cvp_driver.driver, &driver_attr_chkcfg);
517 pci_unregister_driver(&altera_cvp_driver);
520 module_init(altera_cvp_init);
521 module_exit(altera_cvp_exit);
523 MODULE_LICENSE("GPL v2");
524 MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>");
525 MODULE_DESCRIPTION("Module to load Altera FPGA over CvP");