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greybus: Replace zero-length array with flexible-array
[linux.git] / drivers / fpga / dfl.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Driver Header File for FPGA Device Feature List (DFL) Support
4  *
5  * Copyright (C) 2017-2018 Intel Corporation, Inc.
6  *
7  * Authors:
8  *   Kang Luwei <[email protected]>
9  *   Zhang Yi <[email protected]>
10  *   Wu Hao <[email protected]>
11  *   Xiao Guangrong <[email protected]>
12  */
13
14 #ifndef __FPGA_DFL_H
15 #define __FPGA_DFL_H
16
17 #include <linux/bitfield.h>
18 #include <linux/cdev.h>
19 #include <linux/delay.h>
20 #include <linux/fs.h>
21 #include <linux/iopoll.h>
22 #include <linux/io-64-nonatomic-lo-hi.h>
23 #include <linux/platform_device.h>
24 #include <linux/slab.h>
25 #include <linux/uuid.h>
26 #include <linux/fpga/fpga-region.h>
27
28 /* maximum supported number of ports */
29 #define MAX_DFL_FPGA_PORT_NUM 4
30 /* plus one for fme device */
31 #define MAX_DFL_FEATURE_DEV_NUM    (MAX_DFL_FPGA_PORT_NUM + 1)
32
33 /* Reserved 0xfe for Header Group Register and 0xff for AFU */
34 #define FEATURE_ID_FIU_HEADER           0xfe
35 #define FEATURE_ID_AFU                  0xff
36
37 #define FME_FEATURE_ID_HEADER           FEATURE_ID_FIU_HEADER
38 #define FME_FEATURE_ID_THERMAL_MGMT     0x1
39 #define FME_FEATURE_ID_POWER_MGMT       0x2
40 #define FME_FEATURE_ID_GLOBAL_IPERF     0x3
41 #define FME_FEATURE_ID_GLOBAL_ERR       0x4
42 #define FME_FEATURE_ID_PR_MGMT          0x5
43 #define FME_FEATURE_ID_HSSI             0x6
44 #define FME_FEATURE_ID_GLOBAL_DPERF     0x7
45
46 #define PORT_FEATURE_ID_HEADER          FEATURE_ID_FIU_HEADER
47 #define PORT_FEATURE_ID_AFU             FEATURE_ID_AFU
48 #define PORT_FEATURE_ID_ERROR           0x10
49 #define PORT_FEATURE_ID_UMSG            0x11
50 #define PORT_FEATURE_ID_UINT            0x12
51 #define PORT_FEATURE_ID_STP             0x13
52
53 /*
54  * Device Feature Header Register Set
55  *
56  * For FIUs, they all have DFH + GUID + NEXT_AFU as common header registers.
57  * For AFUs, they have DFH + GUID as common header registers.
58  * For private features, they only have DFH register as common header.
59  */
60 #define DFH                     0x0
61 #define GUID_L                  0x8
62 #define GUID_H                  0x10
63 #define NEXT_AFU                0x18
64
65 #define DFH_SIZE                0x8
66
67 /* Device Feature Header Register Bitfield */
68 #define DFH_ID                  GENMASK_ULL(11, 0)      /* Feature ID */
69 #define DFH_ID_FIU_FME          0
70 #define DFH_ID_FIU_PORT         1
71 #define DFH_REVISION            GENMASK_ULL(15, 12)     /* Feature revision */
72 #define DFH_NEXT_HDR_OFST       GENMASK_ULL(39, 16)     /* Offset to next DFH */
73 #define DFH_EOL                 BIT_ULL(40)             /* End of list */
74 #define DFH_TYPE                GENMASK_ULL(63, 60)     /* Feature type */
75 #define DFH_TYPE_AFU            1
76 #define DFH_TYPE_PRIVATE        3
77 #define DFH_TYPE_FIU            4
78
79 /* Next AFU Register Bitfield */
80 #define NEXT_AFU_NEXT_DFH_OFST  GENMASK_ULL(23, 0)      /* Offset to next AFU */
81
82 /* FME Header Register Set */
83 #define FME_HDR_DFH             DFH
84 #define FME_HDR_GUID_L          GUID_L
85 #define FME_HDR_GUID_H          GUID_H
86 #define FME_HDR_NEXT_AFU        NEXT_AFU
87 #define FME_HDR_CAP             0x30
88 #define FME_HDR_PORT_OFST(n)    (0x38 + ((n) * 0x8))
89 #define FME_HDR_BITSTREAM_ID    0x60
90 #define FME_HDR_BITSTREAM_MD    0x68
91
92 /* FME Fab Capability Register Bitfield */
93 #define FME_CAP_FABRIC_VERID    GENMASK_ULL(7, 0)       /* Fabric version ID */
94 #define FME_CAP_SOCKET_ID       BIT_ULL(8)              /* Socket ID */
95 #define FME_CAP_PCIE0_LINK_AVL  BIT_ULL(12)             /* PCIE0 Link */
96 #define FME_CAP_PCIE1_LINK_AVL  BIT_ULL(13)             /* PCIE1 Link */
97 #define FME_CAP_COHR_LINK_AVL   BIT_ULL(14)             /* Coherent Link */
98 #define FME_CAP_IOMMU_AVL       BIT_ULL(16)             /* IOMMU available */
99 #define FME_CAP_NUM_PORTS       GENMASK_ULL(19, 17)     /* Number of ports */
100 #define FME_CAP_ADDR_WIDTH      GENMASK_ULL(29, 24)     /* Address bus width */
101 #define FME_CAP_CACHE_SIZE      GENMASK_ULL(43, 32)     /* cache size in KB */
102 #define FME_CAP_CACHE_ASSOC     GENMASK_ULL(47, 44)     /* Associativity */
103
104 /* FME Port Offset Register Bitfield */
105 /* Offset to port device feature header */
106 #define FME_PORT_OFST_DFH_OFST  GENMASK_ULL(23, 0)
107 /* PCI Bar ID for this port */
108 #define FME_PORT_OFST_BAR_ID    GENMASK_ULL(34, 32)
109 /* AFU MMIO access permission. 1 - VF, 0 - PF. */
110 #define FME_PORT_OFST_ACC_CTRL  BIT_ULL(55)
111 #define FME_PORT_OFST_ACC_PF    0
112 #define FME_PORT_OFST_ACC_VF    1
113 #define FME_PORT_OFST_IMP       BIT_ULL(60)
114
115 /* PORT Header Register Set */
116 #define PORT_HDR_DFH            DFH
117 #define PORT_HDR_GUID_L         GUID_L
118 #define PORT_HDR_GUID_H         GUID_H
119 #define PORT_HDR_NEXT_AFU       NEXT_AFU
120 #define PORT_HDR_CAP            0x30
121 #define PORT_HDR_CTRL           0x38
122 #define PORT_HDR_STS            0x40
123 #define PORT_HDR_USRCLK_CMD0    0x50
124 #define PORT_HDR_USRCLK_CMD1    0x58
125 #define PORT_HDR_USRCLK_STS0    0x60
126 #define PORT_HDR_USRCLK_STS1    0x68
127
128 /* Port Capability Register Bitfield */
129 #define PORT_CAP_PORT_NUM       GENMASK_ULL(1, 0)       /* ID of this port */
130 #define PORT_CAP_MMIO_SIZE      GENMASK_ULL(23, 8)      /* MMIO size in KB */
131 #define PORT_CAP_SUPP_INT_NUM   GENMASK_ULL(35, 32)     /* Interrupts num */
132
133 /* Port Control Register Bitfield */
134 #define PORT_CTRL_SFTRST        BIT_ULL(0)              /* Port soft reset */
135 /* Latency tolerance reporting. '1' >= 40us, '0' < 40us.*/
136 #define PORT_CTRL_LATENCY       BIT_ULL(2)
137 #define PORT_CTRL_SFTRST_ACK    BIT_ULL(4)              /* HW ack for reset */
138
139 /* Port Status Register Bitfield */
140 #define PORT_STS_AP2_EVT        BIT_ULL(13)             /* AP2 event detected */
141 #define PORT_STS_AP1_EVT        BIT_ULL(12)             /* AP1 event detected */
142 #define PORT_STS_PWR_STATE      GENMASK_ULL(11, 8)      /* AFU power states */
143 #define PORT_STS_PWR_STATE_NORM 0
144 #define PORT_STS_PWR_STATE_AP1  1                       /* 50% throttling */
145 #define PORT_STS_PWR_STATE_AP2  2                       /* 90% throttling */
146 #define PORT_STS_PWR_STATE_AP6  6                       /* 100% throttling */
147
148 /**
149  * struct dfl_fpga_port_ops - port ops
150  *
151  * @name: name of this port ops, to match with port platform device.
152  * @owner: pointer to the module which owns this port ops.
153  * @node: node to link port ops to global list.
154  * @get_id: get port id from hardware.
155  * @enable_set: enable/disable the port.
156  */
157 struct dfl_fpga_port_ops {
158         const char *name;
159         struct module *owner;
160         struct list_head node;
161         int (*get_id)(struct platform_device *pdev);
162         int (*enable_set)(struct platform_device *pdev, bool enable);
163 };
164
165 void dfl_fpga_port_ops_add(struct dfl_fpga_port_ops *ops);
166 void dfl_fpga_port_ops_del(struct dfl_fpga_port_ops *ops);
167 struct dfl_fpga_port_ops *dfl_fpga_port_ops_get(struct platform_device *pdev);
168 void dfl_fpga_port_ops_put(struct dfl_fpga_port_ops *ops);
169 int dfl_fpga_check_port_id(struct platform_device *pdev, void *pport_id);
170
171 /**
172  * struct dfl_feature_id - dfl private feature id
173  *
174  * @id: unique dfl private feature id.
175  */
176 struct dfl_feature_id {
177         u64 id;
178 };
179
180 /**
181  * struct dfl_feature_driver - dfl private feature driver
182  *
183  * @id_table: id_table for dfl private features supported by this driver.
184  * @ops: ops of this dfl private feature driver.
185  */
186 struct dfl_feature_driver {
187         const struct dfl_feature_id *id_table;
188         const struct dfl_feature_ops *ops;
189 };
190
191 /**
192  * struct dfl_feature - sub feature of the feature devices
193  *
194  * @id: sub feature id.
195  * @resource_index: each sub feature has one mmio resource for its registers.
196  *                  this index is used to find its mmio resource from the
197  *                  feature dev (platform device)'s reources.
198  * @ioaddr: mapped mmio resource address.
199  * @ops: ops of this sub feature.
200  * @priv: priv data of this feature.
201  */
202 struct dfl_feature {
203         u64 id;
204         int resource_index;
205         void __iomem *ioaddr;
206         const struct dfl_feature_ops *ops;
207         void *priv;
208 };
209
210 #define DEV_STATUS_IN_USE       0
211
212 #define FEATURE_DEV_ID_UNUSED   (-1)
213
214 /**
215  * struct dfl_feature_platform_data - platform data for feature devices
216  *
217  * @node: node to link feature devs to container device's port_dev_list.
218  * @lock: mutex to protect platform data.
219  * @cdev: cdev of feature dev.
220  * @dev: ptr to platform device linked with this platform data.
221  * @dfl_cdev: ptr to container device.
222  * @id: id used for this feature device.
223  * @disable_count: count for port disable.
224  * @num: number for sub features.
225  * @dev_status: dev status (e.g. DEV_STATUS_IN_USE).
226  * @private: ptr to feature dev private data.
227  * @features: sub features of this feature dev.
228  */
229 struct dfl_feature_platform_data {
230         struct list_head node;
231         struct mutex lock;
232         struct cdev cdev;
233         struct platform_device *dev;
234         struct dfl_fpga_cdev *dfl_cdev;
235         int id;
236         unsigned int disable_count;
237         unsigned long dev_status;
238         void *private;
239         int num;
240         struct dfl_feature features[0];
241 };
242
243 static inline
244 int dfl_feature_dev_use_begin(struct dfl_feature_platform_data *pdata)
245 {
246         /* Test and set IN_USE flags to ensure file is exclusively used */
247         if (test_and_set_bit_lock(DEV_STATUS_IN_USE, &pdata->dev_status))
248                 return -EBUSY;
249
250         return 0;
251 }
252
253 static inline
254 void dfl_feature_dev_use_end(struct dfl_feature_platform_data *pdata)
255 {
256         clear_bit_unlock(DEV_STATUS_IN_USE, &pdata->dev_status);
257 }
258
259 static inline
260 void dfl_fpga_pdata_set_private(struct dfl_feature_platform_data *pdata,
261                                 void *private)
262 {
263         pdata->private = private;
264 }
265
266 static inline
267 void *dfl_fpga_pdata_get_private(struct dfl_feature_platform_data *pdata)
268 {
269         return pdata->private;
270 }
271
272 struct dfl_feature_ops {
273         int (*init)(struct platform_device *pdev, struct dfl_feature *feature);
274         void (*uinit)(struct platform_device *pdev,
275                       struct dfl_feature *feature);
276         long (*ioctl)(struct platform_device *pdev, struct dfl_feature *feature,
277                       unsigned int cmd, unsigned long arg);
278 };
279
280 #define DFL_FPGA_FEATURE_DEV_FME                "dfl-fme"
281 #define DFL_FPGA_FEATURE_DEV_PORT               "dfl-port"
282
283 static inline int dfl_feature_platform_data_size(const int num)
284 {
285         return sizeof(struct dfl_feature_platform_data) +
286                 num * sizeof(struct dfl_feature);
287 }
288
289 void dfl_fpga_dev_feature_uinit(struct platform_device *pdev);
290 int dfl_fpga_dev_feature_init(struct platform_device *pdev,
291                               struct dfl_feature_driver *feature_drvs);
292
293 int dfl_fpga_dev_ops_register(struct platform_device *pdev,
294                               const struct file_operations *fops,
295                               struct module *owner);
296 void dfl_fpga_dev_ops_unregister(struct platform_device *pdev);
297
298 static inline
299 struct platform_device *dfl_fpga_inode_to_feature_dev(struct inode *inode)
300 {
301         struct dfl_feature_platform_data *pdata;
302
303         pdata = container_of(inode->i_cdev, struct dfl_feature_platform_data,
304                              cdev);
305         return pdata->dev;
306 }
307
308 #define dfl_fpga_dev_for_each_feature(pdata, feature)                       \
309         for ((feature) = (pdata)->features;                                 \
310            (feature) < (pdata)->features + (pdata)->num; (feature)++)
311
312 static inline
313 struct dfl_feature *dfl_get_feature_by_id(struct device *dev, u64 id)
314 {
315         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
316         struct dfl_feature *feature;
317
318         dfl_fpga_dev_for_each_feature(pdata, feature)
319                 if (feature->id == id)
320                         return feature;
321
322         return NULL;
323 }
324
325 static inline
326 void __iomem *dfl_get_feature_ioaddr_by_id(struct device *dev, u64 id)
327 {
328         struct dfl_feature *feature = dfl_get_feature_by_id(dev, id);
329
330         if (feature && feature->ioaddr)
331                 return feature->ioaddr;
332
333         WARN_ON(1);
334         return NULL;
335 }
336
337 static inline bool is_dfl_feature_present(struct device *dev, u64 id)
338 {
339         return !!dfl_get_feature_ioaddr_by_id(dev, id);
340 }
341
342 static inline
343 struct device *dfl_fpga_pdata_to_parent(struct dfl_feature_platform_data *pdata)
344 {
345         return pdata->dev->dev.parent->parent;
346 }
347
348 static inline bool dfl_feature_is_fme(void __iomem *base)
349 {
350         u64 v = readq(base + DFH);
351
352         return (FIELD_GET(DFH_TYPE, v) == DFH_TYPE_FIU) &&
353                 (FIELD_GET(DFH_ID, v) == DFH_ID_FIU_FME);
354 }
355
356 static inline bool dfl_feature_is_port(void __iomem *base)
357 {
358         u64 v = readq(base + DFH);
359
360         return (FIELD_GET(DFH_TYPE, v) == DFH_TYPE_FIU) &&
361                 (FIELD_GET(DFH_ID, v) == DFH_ID_FIU_PORT);
362 }
363
364 static inline u8 dfl_feature_revision(void __iomem *base)
365 {
366         return (u8)FIELD_GET(DFH_REVISION, readq(base + DFH));
367 }
368
369 /**
370  * struct dfl_fpga_enum_info - DFL FPGA enumeration information
371  *
372  * @dev: parent device.
373  * @dfls: list of device feature lists.
374  */
375 struct dfl_fpga_enum_info {
376         struct device *dev;
377         struct list_head dfls;
378 };
379
380 /**
381  * struct dfl_fpga_enum_dfl - DFL FPGA enumeration device feature list info
382  *
383  * @start: base address of this device feature list.
384  * @len: size of this device feature list.
385  * @ioaddr: mapped base address of this device feature list.
386  * @node: node in list of device feature lists.
387  */
388 struct dfl_fpga_enum_dfl {
389         resource_size_t start;
390         resource_size_t len;
391
392         void __iomem *ioaddr;
393
394         struct list_head node;
395 };
396
397 struct dfl_fpga_enum_info *dfl_fpga_enum_info_alloc(struct device *dev);
398 int dfl_fpga_enum_info_add_dfl(struct dfl_fpga_enum_info *info,
399                                resource_size_t start, resource_size_t len,
400                                void __iomem *ioaddr);
401 void dfl_fpga_enum_info_free(struct dfl_fpga_enum_info *info);
402
403 /**
404  * struct dfl_fpga_cdev - container device of DFL based FPGA
405  *
406  * @parent: parent device of this container device.
407  * @region: base fpga region.
408  * @fme_dev: FME feature device under this container device.
409  * @lock: mutex lock to protect the port device list.
410  * @port_dev_list: list of all port feature devices under this container device.
411  * @released_port_num: released port number under this container device.
412  */
413 struct dfl_fpga_cdev {
414         struct device *parent;
415         struct fpga_region *region;
416         struct device *fme_dev;
417         struct mutex lock;
418         struct list_head port_dev_list;
419         int released_port_num;
420 };
421
422 struct dfl_fpga_cdev *
423 dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info);
424 void dfl_fpga_feature_devs_remove(struct dfl_fpga_cdev *cdev);
425
426 /*
427  * need to drop the device reference with put_device() after use port platform
428  * device returned by __dfl_fpga_cdev_find_port and dfl_fpga_cdev_find_port
429  * functions.
430  */
431 struct platform_device *
432 __dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
433                           int (*match)(struct platform_device *, void *));
434
435 static inline struct platform_device *
436 dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
437                         int (*match)(struct platform_device *, void *))
438 {
439         struct platform_device *pdev;
440
441         mutex_lock(&cdev->lock);
442         pdev = __dfl_fpga_cdev_find_port(cdev, data, match);
443         mutex_unlock(&cdev->lock);
444
445         return pdev;
446 }
447
448 int dfl_fpga_cdev_release_port(struct dfl_fpga_cdev *cdev, int port_id);
449 int dfl_fpga_cdev_assign_port(struct dfl_fpga_cdev *cdev, int port_id);
450 void dfl_fpga_cdev_config_ports_pf(struct dfl_fpga_cdev *cdev);
451 int dfl_fpga_cdev_config_ports_vf(struct dfl_fpga_cdev *cdev, int num_vf);
452 #endif /* __FPGA_DFL_H */
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