1/*
2 * Copyright (C) 2012 CERN (www.cern.ch)
3 * Author: Alessandro Rubini <rubini@gnudd.com>
4 *
5 * Released according to the GNU GPL, version 2 or any later version.
6 *
7 * This work is part of the White Rabbit project, a research effort led
8 * by CERN, the European Institute for Nuclear Research.
9 */
10#ifndef __LINUX_FMC_H__
11#define __LINUX_FMC_H__
12#include <linux/types.h>
13#include <linux/moduleparam.h>
14#include <linux/device.h>
15#include <linux/list.h>
16#include <linux/interrupt.h>
17#include <linux/io.h>
18
19struct fmc_device;
20struct fmc_driver;
21
22/*
23 * This bus abstraction is developed separately from drivers, so we need
24 * to check the version of the data structures we receive.
25 */
26
27#define FMC_MAJOR	3
28#define FMC_MINOR	0
29#define FMC_VERSION	((FMC_MAJOR << 16) | FMC_MINOR)
30#define __FMC_MAJOR(x)	((x) >> 16)
31#define __FMC_MINOR(x)	((x) & 0xffff)
32
33/*
34 * The device identification, as defined by the IPMI FRU (Field Replaceable
35 * Unit) includes four different strings to describe the device. Here we
36 * only match the "Board Manufacturer" and the "Board Product Name",
37 * ignoring the "Board Serial Number" and "Board Part Number". All 4 are
38 * expected to be strings, so they are treated as zero-terminated C strings.
39 * Unspecified string (NULL) means "any", so if both are unspecified this
40 * is a catch-all driver. So null entries are allowed and we use array
41 * and length. This is unlike pci and usb that use null-terminated arrays
42 */
43struct fmc_fru_id {
44	char *manufacturer;
45	char *product_name;
46};
47
48/*
49 * If the FPGA is already programmed (think Etherbone or the second
50 * SVEC slot), we can match on SDB devices in the memory image. This
51 * match uses an array of devices that must all be present, and the
52 * match is based on vendor and device only. Further checks are expected
53 * to happen in the probe function. Zero means "any" and catch-all is allowed.
54 */
55struct fmc_sdb_one_id {
56	uint64_t vendor;
57	uint32_t device;
58};
59struct fmc_sdb_id {
60	struct fmc_sdb_one_id *cores;
61	int cores_nr;
62};
63
64struct fmc_device_id {
65	struct fmc_fru_id *fru_id;
66	int fru_id_nr;
67	struct fmc_sdb_id *sdb_id;
68	int sdb_id_nr;
69};
70
71/* This sizes the module_param_array used by generic module parameters */
72#define FMC_MAX_CARDS 32
73
74/* The driver is a pretty simple thing */
75struct fmc_driver {
76	unsigned long version;
77	struct device_driver driver;
78	int (*probe)(struct fmc_device *);
79	int (*remove)(struct fmc_device *);
80	const struct fmc_device_id id_table;
81	/* What follows is for generic module parameters */
82	int busid_n;
83	int busid_val[FMC_MAX_CARDS];
84	int gw_n;
85	char *gw_val[FMC_MAX_CARDS];
86};
87#define to_fmc_driver(x) container_of((x), struct fmc_driver, driver)
88
89/* These are the generic parameters, that drivers may instantiate */
90#define FMC_PARAM_BUSID(_d) \
91    module_param_array_named(busid, _d.busid_val, int, &_d.busid_n, 0444)
92#define FMC_PARAM_GATEWARE(_d) \
93    module_param_array_named(gateware, _d.gw_val, charp, &_d.gw_n, 0444)
94
95/*
96 * Drivers may need to configure gpio pins in the carrier. To read input
97 * (a very uncommon operation, and definitely not in the hot paths), just
98 * configure one gpio only and get 0 or 1 as retval of the config method
99 */
100struct fmc_gpio {
101	char *carrier_name; /* name or NULL for virtual pins */
102	int gpio;
103	int _gpio;	/* internal use by the carrier */
104	int mode;	/* GPIOF_DIR_OUT etc, from <linux/gpio.h> */
105	int irqmode;	/* IRQF_TRIGGER_LOW and so on */
106};
107
108/* The numbering of gpio pins allows access to raw pins or virtual roles */
109#define FMC_GPIO_RAW(x)		(x)		/* 4096 of them */
110#define __FMC_GPIO_IS_RAW(x)	((x) < 0x1000)
111#define FMC_GPIO_IRQ(x)		((x) + 0x1000)	/*  256 of them */
112#define FMC_GPIO_LED(x)		((x) + 0x1100)	/*  256 of them */
113#define FMC_GPIO_KEY(x)		((x) + 0x1200)	/*  256 of them */
114#define FMC_GPIO_TP(x)		((x) + 0x1300)	/*  256 of them */
115#define FMC_GPIO_USER(x)	((x) + 0x1400)	/*  256 of them */
116/* We may add SCL and SDA, or other roles if the need arises */
117
118/* GPIOF_DIR_IN etc are missing before 3.0. copy from <linux/gpio.h> */
119#ifndef GPIOF_DIR_IN
120#  define GPIOF_DIR_OUT   (0 << 0)
121#  define GPIOF_DIR_IN    (1 << 0)
122#  define GPIOF_INIT_LOW  (0 << 1)
123#  define GPIOF_INIT_HIGH (1 << 1)
124#endif
125
126/*
127 * The operations are offered by each carrier and should make driver
128 * design completely independent of the carrier. Named GPIO pins may be
129 * the exception.
130 */
131struct fmc_operations {
132	uint32_t (*read32)(struct fmc_device *fmc, int offset);
133	void (*write32)(struct fmc_device *fmc, uint32_t value, int offset);
134	int (*validate)(struct fmc_device *fmc, struct fmc_driver *drv);
135	int (*reprogram)(struct fmc_device *f, struct fmc_driver *d, char *gw);
136	int (*irq_request)(struct fmc_device *fmc, irq_handler_t h,
137			   char *name, int flags);
138	void (*irq_ack)(struct fmc_device *fmc);
139	int (*irq_free)(struct fmc_device *fmc);
140	int (*gpio_config)(struct fmc_device *fmc, struct fmc_gpio *gpio,
141			   int ngpio);
142	int (*read_ee)(struct fmc_device *fmc, int pos, void *d, int l);
143	int (*write_ee)(struct fmc_device *fmc, int pos, const void *d, int l);
144};
145
146/* Prefer this helper rather than calling of fmc->reprogram directly */
147extern int fmc_reprogram(struct fmc_device *f, struct fmc_driver *d, char *gw,
148		     int sdb_entry);
149
150/*
151 * The device reports all information needed to access hw.
152 *
153 * If we have eeprom_len and not contents, the core reads it.
154 * Then, parsing of identifiers is done by the core which fills fmc_fru_id..
155 * Similarly a device that must be matched based on SDB cores must
156 * fill the entry point and the core will scan the bus (FIXME: sdb match)
157 */
158struct fmc_device {
159	unsigned long version;
160	unsigned long flags;
161	struct module *owner;		/* char device must pin it */
162	struct fmc_fru_id id;		/* for EEPROM-based match */
163	struct fmc_operations *op;	/* carrier-provided */
164	int irq;			/* according to host bus. 0 == none */
165	int eeprom_len;			/* Usually 8kB, may be less */
166	int eeprom_addr;		/* 0x50, 0x52 etc */
167	uint8_t *eeprom;		/* Full contents or leading part */
168	char *carrier_name;		/* "SPEC" or similar, for special use */
169	void *carrier_data;		/* "struct spec *" or equivalent */
170	__iomem void *fpga_base;	/* May be NULL (Etherbone) */
171	__iomem void *slot_base;	/* Set by the driver */
172	struct fmc_device **devarray;	/* Allocated by the bus */
173	int slot_id;			/* Index in the slot array */
174	int nr_slots;			/* Number of slots in this carrier */
175	unsigned long memlen;		/* Used for the char device */
176	struct device dev;		/* For Linux use */
177	struct device *hwdev;		/* The underlying hardware device */
178	unsigned long sdbfs_entry;
179	struct sdb_array *sdb;
180	uint32_t device_id;		/* Filled by the device */
181	char *mezzanine_name;		/* Defaults to ``fmc'' */
182	void *mezzanine_data;
183};
184#define to_fmc_device(x) container_of((x), struct fmc_device, dev)
185
186#define FMC_DEVICE_HAS_GOLDEN		1
187#define FMC_DEVICE_HAS_CUSTOM		2
188#define FMC_DEVICE_NO_MEZZANINE		4
189#define FMC_DEVICE_MATCH_SDB		8 /* fmc-core must scan sdb in fpga */
190
191/*
192 * If fpga_base can be used, the carrier offers no readl/writel methods, and
193 * this expands to a single, fast, I/O access.
194 */
195static inline uint32_t fmc_readl(struct fmc_device *fmc, int offset)
196{
197	if (unlikely(fmc->op->read32))
198		return fmc->op->read32(fmc, offset);
199	return readl(fmc->fpga_base + offset);
200}
201static inline void fmc_writel(struct fmc_device *fmc, uint32_t val, int off)
202{
203	if (unlikely(fmc->op->write32))
204		fmc->op->write32(fmc, val, off);
205	else
206		writel(val, fmc->fpga_base + off);
207}
208
209/* pci-like naming */
210static inline void *fmc_get_drvdata(const struct fmc_device *fmc)
211{
212	return dev_get_drvdata(&fmc->dev);
213}
214
215static inline void fmc_set_drvdata(struct fmc_device *fmc, void *data)
216{
217	dev_set_drvdata(&fmc->dev, data);
218}
219
220/* The 4 access points */
221extern int fmc_driver_register(struct fmc_driver *drv);
222extern void fmc_driver_unregister(struct fmc_driver *drv);
223extern int fmc_device_register(struct fmc_device *tdev);
224extern void fmc_device_unregister(struct fmc_device *tdev);
225
226/* Two more for device sets, all driven by the same FPGA */
227extern int fmc_device_register_n(struct fmc_device **devs, int n);
228extern void fmc_device_unregister_n(struct fmc_device **devs, int n);
229
230/* Internal cross-calls between files; not exported to other modules */
231extern int fmc_match(struct device *dev, struct device_driver *drv);
232extern int fmc_fill_id_info(struct fmc_device *fmc);
233extern void fmc_free_id_info(struct fmc_device *fmc);
234extern void fmc_dump_eeprom(const struct fmc_device *fmc);
235extern void fmc_dump_sdb(const struct fmc_device *fmc);
236
237#endif /* __LINUX_FMC_H__ */
238