drivers/net/wireless/iwlwifi/iwl-bus.h

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  63 #ifndef __iwl_bus_h__
  64 #define __iwl_bus_h__
  65
  66 #include <linux/types.h>
  67 #include <linux/spinlock.h>
  68
  69 /**
  70  * DOC: Bus layer - role and goal
  71  *
  72  * iwl-bus.h defines the API to the bus layer of the iwlwifi driver.
  73  * The bus layer is responsible for doing very basic bus operations that are
  74  * listed in the iwl_bus_ops structure.
  75  * The bus layer registers to the bus driver, advertises the supported HW and
  76  * gets notifications about enumeration, suspend, resume.
  77  * For the moment, the bus layer is not a linux kernel module as itself, and
  78  * the module_init function of the driver must call the bus specific
  79  * registration functions. These functions are listed at the end of this file.
  80  * For the moment, there is only one implementation of this interface: PCI-e.
  81  * This implementation is iwl-pci.c
  82  */
  83
  84 /**
  85  * DOC: encapsulation and type safety
  86  *
  87  * The iwl_bus describes the data that is shared amongst all the bus layer
  88  * implementations. This data is visible to other layers. Data in the bus
  89  * specific area is not visible outside the bus specific implementation.
  90  * iwl_bus holds a pointer to iwl_shared which holds pointer to all the other
  91  * layers of the driver (iwl_priv, iwl_trans). In fact, this is the way to go
  92  * when the transport layer needs to call a function of another layer.
  93  *
  94  * In order to achieve encapsulation, iwl_priv cannot be dereferenced from the
  95  * bus layer. Type safety is still kept since functions that gets iwl_priv gets
  96  * a typed pointer (as opposed to void *).
  97  */
  98
  99 /**
 100  * DOC: probe flow
 101  *
 102  * The module_init calls the bus specific registration function. The
 103  * registration to the bus layer will trigger an enumeration of the bus which
 104  * will call the bus specific probe function.
 105  * The first thing this function must do is to allocate the memory needed by
 106  * iwl_bus + the bus_specific data.
 107  * Once the bus specific probe function has configured the hardware, it
 108  * chooses the appropriate transport layer and calls iwl_probe that will run
 109  * the bus independent probe flow.
 110  *
 111  * Note: The bus specific code must set the following data in iwl_bus before it
 112  *       calls iwl_probe:
 113  *      * bus->dev
 114  *      * bus->irq
 115  *      * bus->ops
 116  */
 117
 118 struct iwl_shared;
 119 struct iwl_bus;
 120
 121 /**
 122  * struct iwl_bus_ops - bus specific operations
 123  * @get_pm_support: must returns true if the bus can go to sleep
 124  * @apm_config: will be called during the config of the APM
 125  * @get_hw_id_string: prints the hw_id in the provided buffer
 126  * @get_hw_id: get hw_id in u32
 127  * @write8: write a byte to register at offset ofs
 128  * @write32: write a dword to register at offset ofs
 129  * @wread32: read a dword at register at offset ofs
 130  */
 131 struct iwl_bus_ops {
 132         bool (*get_pm_support)(struct iwl_bus *bus);
 133         void (*apm_config)(struct iwl_bus *bus);
 134         void (*get_hw_id_string)(struct iwl_bus *bus, char buf[], int buf_len);
 135         u32 (*get_hw_id)(struct iwl_bus *bus);
 136         void (*write8)(struct iwl_bus *bus, u32 ofs, u8 val);
 137         void (*write32)(struct iwl_bus *bus, u32 ofs, u32 val);
 138         u32 (*read32)(struct iwl_bus *bus, u32 ofs);
 139 };
 140
 141 /**
 142  * struct iwl_bus - bus common data
 143  *
 144  * This data is common to all bus layer implementations.
 145  *
 146  * @dev - pointer to struct device * that represents the device
 147  * @ops - pointer to iwl_bus_ops
 148  * @shrd - pointer to iwl_shared which holds shared data from the upper layer
 149  *      NB: for the time being this needs to be set by the upper layer since
 150  *      it allocates the shared data
 151  * @irq - the irq number for the device
 152  * @reg_lock - protect hw register access
 153  */
 154 struct iwl_bus {
 155         struct device *dev;
 156         const struct iwl_bus_ops *ops;
 157         struct iwl_shared *shrd;
 158
 159         unsigned int irq;
 160         spinlock_t reg_lock;
 161
 162         /* pointer to bus specific struct */
 163         /*Ensure that this pointer will always be aligned to sizeof pointer */
 164         char bus_specific[0] __attribute__((__aligned__(sizeof(void *))));
 165 };
 166
 167 static inline bool bus_get_pm_support(struct iwl_bus *bus)
 168 {
 169         return bus->ops->get_pm_support(bus);
 170 }
 171
 172 static inline void bus_apm_config(struct iwl_bus *bus)
 173 {
 174         bus->ops->apm_config(bus);
 175 }
 176
 177 static inline void bus_get_hw_id_string(struct iwl_bus *bus, char buf[],
 178                 int buf_len)
 179 {
 180         bus->ops->get_hw_id_string(bus, buf, buf_len);
 181 }
 182
 183 static inline u32 bus_get_hw_id(struct iwl_bus *bus)
 184 {
 185         return bus->ops->get_hw_id(bus);
 186 }
 187
 188 static inline void bus_write8(struct iwl_bus *bus, u32 ofs, u8 val)
 189 {
 190         bus->ops->write8(bus, ofs, val);
 191 }
 192
 193 static inline void bus_write32(struct iwl_bus *bus, u32 ofs, u32 val)
 194 {
 195         bus->ops->write32(bus, ofs, val);
 196 }
 197
 198 static inline u32 bus_read32(struct iwl_bus *bus, u32 ofs)
 199 {
 200         return bus->ops->read32(bus, ofs);
 201 }
 202
 203 /*****************************************************
 204 * Bus layer registration functions
 205 ******************************************************/
 206 int __must_check iwl_pci_register_driver(void);
 207 void iwl_pci_unregister_driver(void);
 208
 209 #endif /* __iwl_bus_h__ */