arch/powerpc/include/asm/pmac_pfunc.h

   1 #ifndef __PMAC_PFUNC_H__
   2 #define __PMAC_PFUNC_H__
   3
   4 #include <linux/types.h>
   5 #include <linux/list.h>
   6
   7 /* Flags in command lists */
   8 #define PMF_FLAGS_ON_INIT               0x80000000u
   9 #define PMF_FLGAS_ON_TERM               0x40000000u
  10 #define PMF_FLAGS_ON_SLEEP              0x20000000u
  11 #define PMF_FLAGS_ON_WAKE               0x10000000u
  12 #define PMF_FLAGS_ON_DEMAND             0x08000000u
  13 #define PMF_FLAGS_INT_GEN               0x04000000u
  14 #define PMF_FLAGS_HIGH_SPEED            0x02000000u
  15 #define PMF_FLAGS_LOW_SPEED             0x01000000u
  16 #define PMF_FLAGS_SIDE_EFFECTS          0x00800000u
  17
  18 /*
  19  * Arguments to a platform function call.
  20  *
  21  * NOTE: By convention, pointer arguments point to an u32
  22  */
  23 struct pmf_args {
  24         union {
  25                 u32 v;
  26                 u32 *p;
  27         } u[4];
  28         unsigned int count;
  29 };
  30
  31 /*
  32  * A driver capable of interpreting commands provides a handlers
  33  * structure filled with whatever handlers are implemented by this
  34  * driver. Non implemented handlers are left NULL.
  35  *
  36  * PMF_STD_ARGS are the same arguments that are passed to the parser
  37  * and that gets passed back to the various handlers.
  38  *
  39  * Interpreting a given function always start with a begin() call which
  40  * returns an instance data to be passed around subsequent calls, and
  41  * ends with an end() call. This allows the low level driver to implement
  42  * locking policy or per-function instance data.
  43  *
  44  * For interrupt capable functions, irq_enable() is called when a client
  45  * registers, and irq_disable() is called when the last client unregisters
  46  * Note that irq_enable & irq_disable are called within a semaphore held
  47  * by the core, thus you should not try to register yourself to some other
  48  * pmf interrupt during those calls.
  49  */
  50
  51 #define PMF_STD_ARGS    struct pmf_function *func, void *instdata, \
  52                         struct pmf_args *args
  53
  54 struct pmf_function;
  55
  56 struct pmf_handlers {
  57         void * (*begin)(struct pmf_function *func, struct pmf_args *args);
  58         void (*end)(struct pmf_function *func, void *instdata);
  59
  60         int (*irq_enable)(struct pmf_function *func);
  61         int (*irq_disable)(struct pmf_function *func);
  62
  63         int (*write_gpio)(PMF_STD_ARGS, u8 value, u8 mask);
  64         int (*read_gpio)(PMF_STD_ARGS, u8 mask, int rshift, u8 xor);
  65
  66         int (*write_reg32)(PMF_STD_ARGS, u32 offset, u32 value, u32 mask);
  67         int (*read_reg32)(PMF_STD_ARGS, u32 offset);
  68         int (*write_reg16)(PMF_STD_ARGS, u32 offset, u16 value, u16 mask);
  69         int (*read_reg16)(PMF_STD_ARGS, u32 offset);
  70         int (*write_reg8)(PMF_STD_ARGS, u32 offset, u8 value, u8 mask);
  71         int (*read_reg8)(PMF_STD_ARGS, u32 offset);
  72
  73         int (*delay)(PMF_STD_ARGS, u32 duration);
  74
  75         int (*wait_reg32)(PMF_STD_ARGS, u32 offset, u32 value, u32 mask);
  76         int (*wait_reg16)(PMF_STD_ARGS, u32 offset, u16 value, u16 mask);
  77         int (*wait_reg8)(PMF_STD_ARGS, u32 offset, u8 value, u8 mask);
  78
  79         int (*read_i2c)(PMF_STD_ARGS, u32 len);
  80         int (*write_i2c)(PMF_STD_ARGS, u32 len, const u8 *data);
  81         int (*rmw_i2c)(PMF_STD_ARGS, u32 masklen, u32 valuelen, u32 totallen,
  82                        const u8 *maskdata, const u8 *valuedata);
  83
  84         int (*read_cfg)(PMF_STD_ARGS, u32 offset, u32 len);
  85         int (*write_cfg)(PMF_STD_ARGS, u32 offset, u32 len, const u8 *data);
  86         int (*rmw_cfg)(PMF_STD_ARGS, u32 offset, u32 masklen, u32 valuelen,
  87                        u32 totallen, const u8 *maskdata, const u8 *valuedata);
  88
  89         int (*read_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 len);
  90         int (*write_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 len, const u8 *data);
  91         int (*set_i2c_mode)(PMF_STD_ARGS, int mode);
  92         int (*rmw_i2c_sub)(PMF_STD_ARGS, u8 subaddr, u32 masklen, u32 valuelen,
  93                            u32 totallen, const u8 *maskdata,
  94                            const u8 *valuedata);
  95
  96         int (*read_reg32_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
  97                                u32 xor);
  98         int (*read_reg16_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
  99                                u32 xor);
 100         int (*read_reg8_msrx)(PMF_STD_ARGS, u32 offset, u32 mask, u32 shift,
 101                               u32 xor);
 102
 103         int (*write_reg32_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
 104         int (*write_reg16_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
 105         int (*write_reg8_slm)(PMF_STD_ARGS, u32 offset, u32 shift, u32 mask);
 106
 107         int (*mask_and_compare)(PMF_STD_ARGS, u32 len, const u8 *maskdata,
 108                                 const u8 *valuedata);
 109
 110         struct module *owner;
 111 };
 112
 113
 114 /*
 115  * Drivers who expose platform functions register at init time, this
 116  * causes the platform functions for that device node to be parsed in
 117  * advance and associated with the device. The data structures are
 118  * partially public so a driver can walk the list of platform functions
 119  * and eventually inspect the flags
 120  */
 121 struct pmf_device;
 122
 123 struct pmf_function {
 124         /* All functions for a given driver are linked */
 125         struct list_head        link;
 126
 127         /* Function node & driver data */
 128         struct device_node      *node;
 129         void                    *driver_data;
 130
 131         /* For internal use by core */
 132         struct pmf_device       *dev;
 133
 134         /* The name is the "xxx" in "platform-do-xxx", this is how
 135          * platform functions are identified by this code. Some functions
 136          * only operate for a given target, in which case the phandle is
 137          * here (or 0 if the filter doesn't apply)
 138          */
 139         const char              *name;
 140         u32                     phandle;
 141
 142         /* The flags for that function. You can have several functions
 143          * with the same name and different flag
 144          */
 145         u32                     flags;
 146
 147         /* The actual tokenized function blob */
 148         const void              *data;
 149         unsigned int            length;
 150
 151         /* Interrupt clients */
 152         struct list_head        irq_clients;
 153
 154         /* Refcounting */
 155         struct kref             ref;
 156 };
 157
 158 /*
 159  * For platform functions that are interrupts, one can register
 160  * irq_client structures. You canNOT use the same structure twice
 161  * as it contains a link member. Also, the callback is called with
 162  * a spinlock held, you must not call back into any of the pmf_* functions
 163  * from within that callback
 164  */
 165 struct pmf_irq_client {
 166         void                    (*handler)(void *data);
 167         void                    *data;
 168         struct module           *owner;
 169         struct list_head        link;
 170         struct pmf_function     *func;
 171 };
 172
 173
 174 /*
 175  * Register/Unregister a function-capable driver and its handlers
 176  */
 177 extern int pmf_register_driver(struct device_node *np,
 178                               struct pmf_handlers *handlers,
 179                               void *driverdata);
 180
 181 extern void pmf_unregister_driver(struct device_node *np);
 182
 183
 184 /*
 185  * Register/Unregister interrupt clients
 186  */
 187 extern int pmf_register_irq_client(struct device_node *np,
 188                                    const char *name,
 189                                    struct pmf_irq_client *client);
 190
 191 extern void pmf_unregister_irq_client(struct pmf_irq_client *client);
 192
 193 /*
 194  * Called by the handlers when an irq happens
 195  */
 196 extern void pmf_do_irq(struct pmf_function *func);
 197
 198
 199 /*
 200  * Low level call to platform functions.
 201  *
 202  * The phandle can filter on the target object for functions that have
 203  * multiple targets, the flags allow you to restrict the call to a given
 204  * combination of flags.
 205  *
 206  * The args array contains as many arguments as is required by the function,
 207  * this is dependent on the function you are calling, unfortunately Apple
 208  * mechanism provides no way to encode that so you have to get it right at
 209  * the call site. Some functions require no args, in which case, you can
 210  * pass NULL.
 211  *
 212  * You can also pass NULL to the name. This will match any function that has
 213  * the appropriate combination of flags & phandle or you can pass 0 to the
 214  * phandle to match any
 215  */
 216 extern int pmf_do_functions(struct device_node *np, const char *name,
 217                             u32 phandle, u32 flags, struct pmf_args *args);
 218
 219
 220
 221 /*
 222  * High level call to a platform function.
 223  *
 224  * This one looks for the platform-xxx first so you should call it to the
 225  * actual target if any. It will fallback to platform-do-xxx if it can't
 226  * find one. It will also exclusively target functions that have
 227  * the "OnDemand" flag.
 228  */
 229
 230 extern int pmf_call_function(struct device_node *target, const char *name,
 231                              struct pmf_args *args);
 232
 233
 234 /*
 235  * For low latency interrupt usage, you can lookup for on-demand functions
 236  * using the functions below
 237  */
 238
 239 extern struct pmf_function *pmf_find_function(struct device_node *target,
 240                                               const char *name);
 241
 242 extern struct pmf_function * pmf_get_function(struct pmf_function *func);
 243 extern void pmf_put_function(struct pmf_function *func);
 244
 245 extern int pmf_call_one(struct pmf_function *func, struct pmf_args *args);
 246
 247
 248 /* Suspend/resume code called by via-pmu directly for now */
 249 extern void pmac_pfunc_base_suspend(void);
 250 extern void pmac_pfunc_base_resume(void);
 251
 252 #endif /* __PMAC_PFUNC_H__ */