1 /* 2 * Industry-pack bus. 3 * 4 * Copyright (C) 2011-2012 CERN (www.cern.ch) 5 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; version 2 of the License. 10 */ 11 12 #include <linux/mod_devicetable.h> 13 #include <linux/device.h> 14 #include <linux/interrupt.h> 15 16 #define IPACK_IDPROM_OFFSET_I 0x01 17 #define IPACK_IDPROM_OFFSET_P 0x03 18 #define IPACK_IDPROM_OFFSET_A 0x05 19 #define IPACK_IDPROM_OFFSET_C 0x07 20 #define IPACK_IDPROM_OFFSET_MANUFACTURER_ID 0x09 21 #define IPACK_IDPROM_OFFSET_MODEL 0x0B 22 #define IPACK_IDPROM_OFFSET_REVISION 0x0D 23 #define IPACK_IDPROM_OFFSET_RESERVED 0x0F 24 #define IPACK_IDPROM_OFFSET_DRIVER_ID_L 0x11 25 #define IPACK_IDPROM_OFFSET_DRIVER_ID_H 0x13 26 #define IPACK_IDPROM_OFFSET_NUM_BYTES 0x15 27 #define IPACK_IDPROM_OFFSET_CRC 0x17 28 29 /* 30 * IndustryPack Fromat, Vendor and Device IDs. 31 */ 32 33 /* ID section format versions */ 34 #define IPACK_ID_VERSION_INVALID 0x00 35 #define IPACK_ID_VERSION_1 0x01 36 #define IPACK_ID_VERSION_2 0x02 37 38 /* Vendors and devices. Sort key: vendor first, device next. */ 39 #define IPACK1_VENDOR_ID_RESERVED1 0x00 40 #define IPACK1_VENDOR_ID_RESERVED2 0xFF 41 #define IPACK1_VENDOR_ID_UNREGISTRED01 0x01 42 #define IPACK1_VENDOR_ID_UNREGISTRED02 0x02 43 #define IPACK1_VENDOR_ID_UNREGISTRED03 0x03 44 #define IPACK1_VENDOR_ID_UNREGISTRED04 0x04 45 #define IPACK1_VENDOR_ID_UNREGISTRED05 0x05 46 #define IPACK1_VENDOR_ID_UNREGISTRED06 0x06 47 #define IPACK1_VENDOR_ID_UNREGISTRED07 0x07 48 #define IPACK1_VENDOR_ID_UNREGISTRED08 0x08 49 #define IPACK1_VENDOR_ID_UNREGISTRED09 0x09 50 #define IPACK1_VENDOR_ID_UNREGISTRED10 0x0A 51 #define IPACK1_VENDOR_ID_UNREGISTRED11 0x0B 52 #define IPACK1_VENDOR_ID_UNREGISTRED12 0x0C 53 #define IPACK1_VENDOR_ID_UNREGISTRED13 0x0D 54 #define IPACK1_VENDOR_ID_UNREGISTRED14 0x0E 55 #define IPACK1_VENDOR_ID_UNREGISTRED15 0x0F 56 57 #define IPACK1_VENDOR_ID_SBS 0xF0 58 #define IPACK1_DEVICE_ID_SBS_OCTAL_232 0x22 59 #define IPACK1_DEVICE_ID_SBS_OCTAL_422 0x2A 60 #define IPACK1_DEVICE_ID_SBS_OCTAL_485 0x48 61 62 struct ipack_bus_ops; 63 struct ipack_driver; 64 65 enum ipack_space { 66 IPACK_IO_SPACE = 0, 67 IPACK_ID_SPACE, 68 IPACK_INT_SPACE, 69 IPACK_MEM8_SPACE, 70 IPACK_MEM16_SPACE, 71 /* Dummy for counting the number of entries. Must remain the last 72 * entry */ 73 IPACK_SPACE_COUNT, 74 }; 75 76 /** 77 */ 78 struct ipack_region { 79 phys_addr_t start; 80 size_t size; 81 }; 82 83 /** 84 * struct ipack_device 85 * 86 * @slot: Slot where the device is plugged in the carrier board 87 * @bus: ipack_bus_device where the device is plugged to. 88 * @id_space: Virtual address to ID space. 89 * @io_space: Virtual address to IO space. 90 * @mem_space: Virtual address to MEM space. 91 * @dev: device in kernel representation. 92 * 93 * Warning: Direct access to mapped memory is possible but the endianness 94 * is not the same with PCI carrier or VME carrier. The endianness is managed 95 * by the carrier board throught bus->ops. 96 */ 97 struct ipack_device { 98 unsigned int slot; 99 struct ipack_bus_device *bus; 100 struct device dev; 101 void (*release) (struct ipack_device *dev); 102 struct ipack_region region[IPACK_SPACE_COUNT]; 103 u8 *id; 104 size_t id_avail; 105 u32 id_vendor; 106 u32 id_device; 107 u8 id_format; 108 unsigned int id_crc_correct:1; 109 unsigned int speed_8mhz:1; 110 unsigned int speed_32mhz:1; 111 }; 112 113 /** 114 * struct ipack_driver_ops -- Callbacks to IPack device driver 115 * 116 * @probe: Probe function 117 * @remove: Prepare imminent removal of the device. Services provided by the 118 * device should be revoked. 119 */ 120 121 struct ipack_driver_ops { 122 int (*probe) (struct ipack_device *dev); 123 void (*remove) (struct ipack_device *dev); 124 }; 125 126 /** 127 * struct ipack_driver -- Specific data to each ipack device driver 128 * 129 * @driver: Device driver kernel representation 130 * @ops: Callbacks provided by the IPack device driver 131 */ 132 struct ipack_driver { 133 struct device_driver driver; 134 const struct ipack_device_id *id_table; 135 const struct ipack_driver_ops *ops; 136 }; 137 138 /** 139 * struct ipack_bus_ops - available operations on a bridge module 140 * 141 * @map_space: map IP address space 142 * @unmap_space: unmap IP address space 143 * @request_irq: request IRQ 144 * @free_irq: free IRQ 145 * @get_clockrate: Returns the clockrate the carrier is currently 146 * communicating with the device at. 147 * @set_clockrate: Sets the clock-rate for carrier / module communication. 148 * Should return -EINVAL if the requested speed is not supported. 149 * @get_error: Returns the error state for the slot the device is attached 150 * to. 151 * @get_timeout: Returns 1 if the communication with the device has 152 * previously timed out. 153 * @reset_timeout: Resets the state returned by get_timeout. 154 */ 155 struct ipack_bus_ops { 156 int (*request_irq) (struct ipack_device *dev, 157 irqreturn_t (*handler)(void *), void *arg); 158 int (*free_irq) (struct ipack_device *dev); 159 int (*get_clockrate) (struct ipack_device *dev); 160 int (*set_clockrate) (struct ipack_device *dev, int mherz); 161 int (*get_error) (struct ipack_device *dev); 162 int (*get_timeout) (struct ipack_device *dev); 163 int (*reset_timeout) (struct ipack_device *dev); 164 }; 165 166 /** 167 * struct ipack_bus_device 168 * 169 * @dev: pointer to carrier device 170 * @slots: number of slots available 171 * @bus_nr: ipack bus number 172 * @ops: bus operations for the mezzanine drivers 173 */ 174 struct ipack_bus_device { 175 struct module *owner; 176 struct device *parent; 177 int slots; 178 int bus_nr; 179 const struct ipack_bus_ops *ops; 180 }; 181 182 /** 183 * ipack_bus_register -- register a new ipack bus 184 * 185 * @parent: pointer to the parent device, if any. 186 * @slots: number of slots available in the bus device. 187 * @ops: bus operations for the mezzanine drivers. 188 * 189 * The carrier board device should call this function to register itself as 190 * available bus device in ipack. 191 */ 192 struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots, 193 const struct ipack_bus_ops *ops, 194 struct module *owner); 195 196 /** 197 * ipack_bus_unregister -- unregister an ipack bus 198 */ 199 int ipack_bus_unregister(struct ipack_bus_device *bus); 200 201 /** 202 * ipack_driver_register -- Register a new ipack device driver 203 * 204 * Called by a ipack driver to register itself as a driver 205 * that can manage ipack devices. 206 */ 207 int ipack_driver_register(struct ipack_driver *edrv, struct module *owner, 208 const char *name); 209 void ipack_driver_unregister(struct ipack_driver *edrv); 210 211 /** 212 * ipack_device_init -- initialize an IPack device 213 * @dev: the new device to initialize. 214 * 215 * Initialize a new IPack device ("module" in IndustryPack jargon). The call 216 * is done by the carrier driver. The carrier should populate the fields 217 * bus and slot as well as the region array of @dev prior to calling this 218 * function. The rest of the fields will be allocated and populated 219 * during initalization. 220 * 221 * Return zero on success or error code on failure. 222 * 223 * NOTE: _Never_ directly free @dev after calling this function, even 224 * if it returned an error! Always use ipack_put_device() to give up the 225 * reference initialized in this function instead. 226 */ 227 int ipack_device_init(struct ipack_device *dev); 228 229 /** 230 * ipack_device_add -- Add an IPack device 231 * @dev: the new device to add. 232 * 233 * Add a new IPack device. The call is done by the carrier driver 234 * after calling ipack_device_init(). 235 * 236 * Return zero on success or error code on failure. 237 * 238 * NOTE: _Never_ directly free @dev after calling this function, even 239 * if it returned an error! Always use ipack_put_device() to give up the 240 * reference initialized in this function instead. 241 */ 242 int ipack_device_add(struct ipack_device *dev); 243 void ipack_device_del(struct ipack_device *dev); 244 245 void ipack_get_device(struct ipack_device *dev); 246 void ipack_put_device(struct ipack_device *dev); 247 248 /** 249 * DEFINE_IPACK_DEVICE_TABLE - macro used to describe a IndustryPack table 250 * @_table: device table name 251 * 252 * This macro is used to create a struct ipack_device_id array (a device table) 253 * in a generic manner. 254 */ 255 #define DEFINE_IPACK_DEVICE_TABLE(_table) \ 256 const struct ipack_device_id _table[] 257 /** 258 * IPACK_DEVICE - macro used to describe a specific IndustryPack device 259 * @_format: the format version (currently either 1 or 2, 8 bit value) 260 * @vend: the 8 or 24 bit IndustryPack Vendor ID 261 * @dev: the 8 or 16 bit IndustryPack Device ID 262 * 263 * This macro is used to create a struct ipack_device_id that matches a specific 264 * device. 265 */ 266 #define IPACK_DEVICE(_format, vend, dev) \ 267 .format = (_format), \ 268 .vendor = (vend), \ 269 .device = (dev) 270 271 /** 272 * ipack_get_carrier - it increase the carrier ref. counter of 273 * the carrier module 274 * @dev: mezzanine device which wants to get the carrier 275 */ 276 static inline int ipack_get_carrier(struct ipack_device *dev) 277 { 278 return try_module_get(dev->bus->owner); 279 } 280 281 /** 282 * ipack_get_carrier - it decrease the carrier ref. counter of 283 * the carrier module 284 * @dev: mezzanine device which wants to get the carrier 285 */ 286 static inline void ipack_put_carrier(struct ipack_device *dev) 287 { 288 module_put(dev->bus->owner); 289 } 290