1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Driver Header File for FPGA Device Feature List (DFL) Support
5 * Copyright (C) 2017-2018 Intel Corporation, Inc.
17 #include <linux/bitfield.h>
18 #include <linux/cdev.h>
19 #include <linux/delay.h>
20 #include <linux/eventfd.h>
22 #include <linux/interrupt.h>
23 #include <linux/iopoll.h>
24 #include <linux/io-64-nonatomic-lo-hi.h>
25 #include <linux/platform_device.h>
26 #include <linux/slab.h>
27 #include <linux/uuid.h>
28 #include <linux/fpga/fpga-region.h>
30 /* maximum supported number of ports */
31 #define MAX_DFL_FPGA_PORT_NUM 4
32 /* plus one for fme device */
33 #define MAX_DFL_FEATURE_DEV_NUM (MAX_DFL_FPGA_PORT_NUM + 1)
35 /* Reserved 0xfe for Header Group Register and 0xff for AFU */
36 #define FEATURE_ID_FIU_HEADER 0xfe
37 #define FEATURE_ID_AFU 0xff
39 #define FME_FEATURE_ID_HEADER FEATURE_ID_FIU_HEADER
40 #define FME_FEATURE_ID_THERMAL_MGMT 0x1
41 #define FME_FEATURE_ID_POWER_MGMT 0x2
42 #define FME_FEATURE_ID_GLOBAL_IPERF 0x3
43 #define FME_FEATURE_ID_GLOBAL_ERR 0x4
44 #define FME_FEATURE_ID_PR_MGMT 0x5
45 #define FME_FEATURE_ID_HSSI 0x6
46 #define FME_FEATURE_ID_GLOBAL_DPERF 0x7
48 #define PORT_FEATURE_ID_HEADER FEATURE_ID_FIU_HEADER
49 #define PORT_FEATURE_ID_AFU FEATURE_ID_AFU
50 #define PORT_FEATURE_ID_ERROR 0x10
51 #define PORT_FEATURE_ID_UMSG 0x11
52 #define PORT_FEATURE_ID_UINT 0x12
53 #define PORT_FEATURE_ID_STP 0x13
56 * Device Feature Header Register Set
58 * For FIUs, they all have DFH + GUID + NEXT_AFU as common header registers.
59 * For AFUs, they have DFH + GUID as common header registers.
60 * For private features, they only have DFH register as common header.
69 /* Device Feature Header Register Bitfield */
70 #define DFH_ID GENMASK_ULL(11, 0) /* Feature ID */
71 #define DFH_ID_FIU_FME 0
72 #define DFH_ID_FIU_PORT 1
73 #define DFH_REVISION GENMASK_ULL(15, 12) /* Feature revision */
74 #define DFH_NEXT_HDR_OFST GENMASK_ULL(39, 16) /* Offset to next DFH */
75 #define DFH_EOL BIT_ULL(40) /* End of list */
76 #define DFH_TYPE GENMASK_ULL(63, 60) /* Feature type */
77 #define DFH_TYPE_AFU 1
78 #define DFH_TYPE_PRIVATE 3
79 #define DFH_TYPE_FIU 4
81 /* Next AFU Register Bitfield */
82 #define NEXT_AFU_NEXT_DFH_OFST GENMASK_ULL(23, 0) /* Offset to next AFU */
84 /* FME Header Register Set */
85 #define FME_HDR_DFH DFH
86 #define FME_HDR_GUID_L GUID_L
87 #define FME_HDR_GUID_H GUID_H
88 #define FME_HDR_NEXT_AFU NEXT_AFU
89 #define FME_HDR_CAP 0x30
90 #define FME_HDR_PORT_OFST(n) (0x38 + ((n) * 0x8))
91 #define FME_HDR_BITSTREAM_ID 0x60
92 #define FME_HDR_BITSTREAM_MD 0x68
94 /* FME Fab Capability Register Bitfield */
95 #define FME_CAP_FABRIC_VERID GENMASK_ULL(7, 0) /* Fabric version ID */
96 #define FME_CAP_SOCKET_ID BIT_ULL(8) /* Socket ID */
97 #define FME_CAP_PCIE0_LINK_AVL BIT_ULL(12) /* PCIE0 Link */
98 #define FME_CAP_PCIE1_LINK_AVL BIT_ULL(13) /* PCIE1 Link */
99 #define FME_CAP_COHR_LINK_AVL BIT_ULL(14) /* Coherent Link */
100 #define FME_CAP_IOMMU_AVL BIT_ULL(16) /* IOMMU available */
101 #define FME_CAP_NUM_PORTS GENMASK_ULL(19, 17) /* Number of ports */
102 #define FME_CAP_ADDR_WIDTH GENMASK_ULL(29, 24) /* Address bus width */
103 #define FME_CAP_CACHE_SIZE GENMASK_ULL(43, 32) /* cache size in KB */
104 #define FME_CAP_CACHE_ASSOC GENMASK_ULL(47, 44) /* Associativity */
106 /* FME Port Offset Register Bitfield */
107 /* Offset to port device feature header */
108 #define FME_PORT_OFST_DFH_OFST GENMASK_ULL(23, 0)
109 /* PCI Bar ID for this port */
110 #define FME_PORT_OFST_BAR_ID GENMASK_ULL(34, 32)
111 /* AFU MMIO access permission. 1 - VF, 0 - PF. */
112 #define FME_PORT_OFST_ACC_CTRL BIT_ULL(55)
113 #define FME_PORT_OFST_ACC_PF 0
114 #define FME_PORT_OFST_ACC_VF 1
115 #define FME_PORT_OFST_IMP BIT_ULL(60)
117 /* FME Error Capability Register */
118 #define FME_ERROR_CAP 0x70
120 /* FME Error Capability Register Bitfield */
121 #define FME_ERROR_CAP_SUPP_INT BIT_ULL(0) /* Interrupt Support */
122 #define FME_ERROR_CAP_INT_VECT GENMASK_ULL(12, 1) /* Interrupt vector */
124 /* PORT Header Register Set */
125 #define PORT_HDR_DFH DFH
126 #define PORT_HDR_GUID_L GUID_L
127 #define PORT_HDR_GUID_H GUID_H
128 #define PORT_HDR_NEXT_AFU NEXT_AFU
129 #define PORT_HDR_CAP 0x30
130 #define PORT_HDR_CTRL 0x38
131 #define PORT_HDR_STS 0x40
132 #define PORT_HDR_USRCLK_CMD0 0x50
133 #define PORT_HDR_USRCLK_CMD1 0x58
134 #define PORT_HDR_USRCLK_STS0 0x60
135 #define PORT_HDR_USRCLK_STS1 0x68
137 /* Port Capability Register Bitfield */
138 #define PORT_CAP_PORT_NUM GENMASK_ULL(1, 0) /* ID of this port */
139 #define PORT_CAP_MMIO_SIZE GENMASK_ULL(23, 8) /* MMIO size in KB */
140 #define PORT_CAP_SUPP_INT_NUM GENMASK_ULL(35, 32) /* Interrupts num */
142 /* Port Control Register Bitfield */
143 #define PORT_CTRL_SFTRST BIT_ULL(0) /* Port soft reset */
144 /* Latency tolerance reporting. '1' >= 40us, '0' < 40us.*/
145 #define PORT_CTRL_LATENCY BIT_ULL(2)
146 #define PORT_CTRL_SFTRST_ACK BIT_ULL(4) /* HW ack for reset */
148 /* Port Status Register Bitfield */
149 #define PORT_STS_AP2_EVT BIT_ULL(13) /* AP2 event detected */
150 #define PORT_STS_AP1_EVT BIT_ULL(12) /* AP1 event detected */
151 #define PORT_STS_PWR_STATE GENMASK_ULL(11, 8) /* AFU power states */
152 #define PORT_STS_PWR_STATE_NORM 0
153 #define PORT_STS_PWR_STATE_AP1 1 /* 50% throttling */
154 #define PORT_STS_PWR_STATE_AP2 2 /* 90% throttling */
155 #define PORT_STS_PWR_STATE_AP6 6 /* 100% throttling */
157 /* Port Error Capability Register */
158 #define PORT_ERROR_CAP 0x38
160 /* Port Error Capability Register Bitfield */
161 #define PORT_ERROR_CAP_SUPP_INT BIT_ULL(0) /* Interrupt Support */
162 #define PORT_ERROR_CAP_INT_VECT GENMASK_ULL(12, 1) /* Interrupt vector */
164 /* Port Uint Capability Register */
165 #define PORT_UINT_CAP 0x8
167 /* Port Uint Capability Register Bitfield */
168 #define PORT_UINT_CAP_INT_NUM GENMASK_ULL(11, 0) /* Interrupts num */
169 #define PORT_UINT_CAP_FST_VECT GENMASK_ULL(23, 12) /* First Vector */
172 * struct dfl_fpga_port_ops - port ops
174 * @name: name of this port ops, to match with port platform device.
175 * @owner: pointer to the module which owns this port ops.
176 * @node: node to link port ops to global list.
177 * @get_id: get port id from hardware.
178 * @enable_set: enable/disable the port.
180 struct dfl_fpga_port_ops {
182 struct module *owner;
183 struct list_head node;
184 int (*get_id)(struct platform_device *pdev);
185 int (*enable_set)(struct platform_device *pdev, bool enable);
188 void dfl_fpga_port_ops_add(struct dfl_fpga_port_ops *ops);
189 void dfl_fpga_port_ops_del(struct dfl_fpga_port_ops *ops);
190 struct dfl_fpga_port_ops *dfl_fpga_port_ops_get(struct platform_device *pdev);
191 void dfl_fpga_port_ops_put(struct dfl_fpga_port_ops *ops);
192 int dfl_fpga_check_port_id(struct platform_device *pdev, void *pport_id);
195 * struct dfl_feature_id - dfl private feature id
197 * @id: unique dfl private feature id.
199 struct dfl_feature_id {
204 * struct dfl_feature_driver - dfl private feature driver
206 * @id_table: id_table for dfl private features supported by this driver.
207 * @ops: ops of this dfl private feature driver.
209 struct dfl_feature_driver {
210 const struct dfl_feature_id *id_table;
211 const struct dfl_feature_ops *ops;
215 * struct dfl_feature_irq_ctx - dfl private feature interrupt context
217 * @irq: Linux IRQ number of this interrupt.
218 * @trigger: eventfd context to signal when interrupt happens.
219 * @name: irq name needed when requesting irq.
221 struct dfl_feature_irq_ctx {
223 struct eventfd_ctx *trigger;
228 * struct dfl_feature - sub feature of the feature devices
230 * @dev: ptr to pdev of the feature device which has the sub feature.
231 * @id: sub feature id.
232 * @resource_index: each sub feature has one mmio resource for its registers.
233 * this index is used to find its mmio resource from the
234 * feature dev (platform device)'s reources.
235 * @ioaddr: mapped mmio resource address.
236 * @irq_ctx: interrupt context list.
237 * @nr_irqs: number of interrupt contexts.
238 * @ops: ops of this sub feature.
239 * @priv: priv data of this feature.
242 struct platform_device *dev;
245 void __iomem *ioaddr;
246 struct dfl_feature_irq_ctx *irq_ctx;
247 unsigned int nr_irqs;
248 const struct dfl_feature_ops *ops;
252 #define FEATURE_DEV_ID_UNUSED (-1)
255 * struct dfl_feature_platform_data - platform data for feature devices
257 * @node: node to link feature devs to container device's port_dev_list.
258 * @lock: mutex to protect platform data.
259 * @cdev: cdev of feature dev.
260 * @dev: ptr to platform device linked with this platform data.
261 * @dfl_cdev: ptr to container device.
262 * @id: id used for this feature device.
263 * @disable_count: count for port disable.
264 * @excl_open: set on feature device exclusive open.
265 * @open_count: count for feature device open.
266 * @num: number for sub features.
267 * @private: ptr to feature dev private data.
268 * @features: sub features of this feature dev.
270 struct dfl_feature_platform_data {
271 struct list_head node;
274 struct platform_device *dev;
275 struct dfl_fpga_cdev *dfl_cdev;
277 unsigned int disable_count;
282 struct dfl_feature features[];
286 int dfl_feature_dev_use_begin(struct dfl_feature_platform_data *pdata,
289 if (pdata->excl_open)
293 if (pdata->open_count)
296 pdata->excl_open = true;
304 void dfl_feature_dev_use_end(struct dfl_feature_platform_data *pdata)
306 pdata->excl_open = false;
308 if (WARN_ON(pdata->open_count <= 0))
315 int dfl_feature_dev_use_count(struct dfl_feature_platform_data *pdata)
317 return pdata->open_count;
321 void dfl_fpga_pdata_set_private(struct dfl_feature_platform_data *pdata,
324 pdata->private = private;
328 void *dfl_fpga_pdata_get_private(struct dfl_feature_platform_data *pdata)
330 return pdata->private;
333 struct dfl_feature_ops {
334 int (*init)(struct platform_device *pdev, struct dfl_feature *feature);
335 void (*uinit)(struct platform_device *pdev,
336 struct dfl_feature *feature);
337 long (*ioctl)(struct platform_device *pdev, struct dfl_feature *feature,
338 unsigned int cmd, unsigned long arg);
341 #define DFL_FPGA_FEATURE_DEV_FME "dfl-fme"
342 #define DFL_FPGA_FEATURE_DEV_PORT "dfl-port"
344 void dfl_fpga_dev_feature_uinit(struct platform_device *pdev);
345 int dfl_fpga_dev_feature_init(struct platform_device *pdev,
346 struct dfl_feature_driver *feature_drvs);
348 int dfl_fpga_dev_ops_register(struct platform_device *pdev,
349 const struct file_operations *fops,
350 struct module *owner);
351 void dfl_fpga_dev_ops_unregister(struct platform_device *pdev);
354 struct platform_device *dfl_fpga_inode_to_feature_dev(struct inode *inode)
356 struct dfl_feature_platform_data *pdata;
358 pdata = container_of(inode->i_cdev, struct dfl_feature_platform_data,
363 #define dfl_fpga_dev_for_each_feature(pdata, feature) \
364 for ((feature) = (pdata)->features; \
365 (feature) < (pdata)->features + (pdata)->num; (feature)++)
368 struct dfl_feature *dfl_get_feature_by_id(struct device *dev, u64 id)
370 struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
371 struct dfl_feature *feature;
373 dfl_fpga_dev_for_each_feature(pdata, feature)
374 if (feature->id == id)
381 void __iomem *dfl_get_feature_ioaddr_by_id(struct device *dev, u64 id)
383 struct dfl_feature *feature = dfl_get_feature_by_id(dev, id);
385 if (feature && feature->ioaddr)
386 return feature->ioaddr;
392 static inline bool is_dfl_feature_present(struct device *dev, u64 id)
394 return !!dfl_get_feature_ioaddr_by_id(dev, id);
398 struct device *dfl_fpga_pdata_to_parent(struct dfl_feature_platform_data *pdata)
400 return pdata->dev->dev.parent->parent;
403 static inline bool dfl_feature_is_fme(void __iomem *base)
405 u64 v = readq(base + DFH);
407 return (FIELD_GET(DFH_TYPE, v) == DFH_TYPE_FIU) &&
408 (FIELD_GET(DFH_ID, v) == DFH_ID_FIU_FME);
411 static inline bool dfl_feature_is_port(void __iomem *base)
413 u64 v = readq(base + DFH);
415 return (FIELD_GET(DFH_TYPE, v) == DFH_TYPE_FIU) &&
416 (FIELD_GET(DFH_ID, v) == DFH_ID_FIU_PORT);
419 static inline u8 dfl_feature_revision(void __iomem *base)
421 return (u8)FIELD_GET(DFH_REVISION, readq(base + DFH));
425 * struct dfl_fpga_enum_info - DFL FPGA enumeration information
427 * @dev: parent device.
428 * @dfls: list of device feature lists.
429 * @nr_irqs: number of irqs for all feature devices.
430 * @irq_table: Linux IRQ numbers for all irqs, indexed by hw irq numbers.
432 struct dfl_fpga_enum_info {
434 struct list_head dfls;
435 unsigned int nr_irqs;
440 * struct dfl_fpga_enum_dfl - DFL FPGA enumeration device feature list info
442 * @start: base address of this device feature list.
443 * @len: size of this device feature list.
444 * @ioaddr: mapped base address of this device feature list.
445 * @node: node in list of device feature lists.
447 struct dfl_fpga_enum_dfl {
448 resource_size_t start;
451 void __iomem *ioaddr;
453 struct list_head node;
456 struct dfl_fpga_enum_info *dfl_fpga_enum_info_alloc(struct device *dev);
457 int dfl_fpga_enum_info_add_dfl(struct dfl_fpga_enum_info *info,
458 resource_size_t start, resource_size_t len,
459 void __iomem *ioaddr);
460 int dfl_fpga_enum_info_add_irq(struct dfl_fpga_enum_info *info,
461 unsigned int nr_irqs, int *irq_table);
462 void dfl_fpga_enum_info_free(struct dfl_fpga_enum_info *info);
465 * struct dfl_fpga_cdev - container device of DFL based FPGA
467 * @parent: parent device of this container device.
468 * @region: base fpga region.
469 * @fme_dev: FME feature device under this container device.
470 * @lock: mutex lock to protect the port device list.
471 * @port_dev_list: list of all port feature devices under this container device.
472 * @released_port_num: released port number under this container device.
474 struct dfl_fpga_cdev {
475 struct device *parent;
476 struct fpga_region *region;
477 struct device *fme_dev;
479 struct list_head port_dev_list;
480 int released_port_num;
483 struct dfl_fpga_cdev *
484 dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info);
485 void dfl_fpga_feature_devs_remove(struct dfl_fpga_cdev *cdev);
488 * need to drop the device reference with put_device() after use port platform
489 * device returned by __dfl_fpga_cdev_find_port and dfl_fpga_cdev_find_port
492 struct platform_device *
493 __dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
494 int (*match)(struct platform_device *, void *));
496 static inline struct platform_device *
497 dfl_fpga_cdev_find_port(struct dfl_fpga_cdev *cdev, void *data,
498 int (*match)(struct platform_device *, void *))
500 struct platform_device *pdev;
502 mutex_lock(&cdev->lock);
503 pdev = __dfl_fpga_cdev_find_port(cdev, data, match);
504 mutex_unlock(&cdev->lock);
509 int dfl_fpga_cdev_release_port(struct dfl_fpga_cdev *cdev, int port_id);
510 int dfl_fpga_cdev_assign_port(struct dfl_fpga_cdev *cdev, int port_id);
511 void dfl_fpga_cdev_config_ports_pf(struct dfl_fpga_cdev *cdev);
512 int dfl_fpga_cdev_config_ports_vf(struct dfl_fpga_cdev *cdev, int num_vf);
513 int dfl_fpga_set_irq_triggers(struct dfl_feature *feature, unsigned int start,
514 unsigned int count, int32_t *fds);
515 long dfl_feature_ioctl_get_num_irqs(struct platform_device *pdev,
516 struct dfl_feature *feature,
518 long dfl_feature_ioctl_set_irq(struct platform_device *pdev,
519 struct dfl_feature *feature,
522 #endif /* __FPGA_DFL_H */