drivers/gpu/drm/nouveau/include/nvkm/subdev/i2c.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __NVKM_I2C_H__
   3 #define __NVKM_I2C_H__
   4 #include <core/subdev.h>
   5 #include <core/event.h>
   6
   7 #include <subdev/bios.h>
   8 #include <subdev/bios/i2c.h>
   9
  10 struct nvkm_i2c_ntfy_req {
  11 #define NVKM_I2C_PLUG                                                      0x01
  12 #define NVKM_I2C_UNPLUG                                                    0x02
  13 #define NVKM_I2C_IRQ                                                       0x04
  14 #define NVKM_I2C_DONE                                                      0x08
  15 #define NVKM_I2C_ANY                                                       0x0f
  16         u8 mask;
  17         u8 port;
  18 };
  19
  20 struct nvkm_i2c_ntfy_rep {
  21         u8 mask;
  22 };
  23
  24 struct nvkm_i2c_bus_probe {
  25         struct i2c_board_info dev;
  26         u8 udelay; /* set to 0 to use the standard delay */
  27 };
  28
  29 struct nvkm_i2c_bus {
  30         const struct nvkm_i2c_bus_func *func;
  31         struct nvkm_i2c_pad *pad;
  32 #define NVKM_I2C_BUS_CCB(n) /* 'n' is ccb index */                           (n)
  33 #define NVKM_I2C_BUS_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x100)
  34 #define NVKM_I2C_BUS_PRI /* ccb primary comm. port */                        -1
  35 #define NVKM_I2C_BUS_SEC /* ccb secondary comm. port */                      -2
  36         int id;
  37
  38         struct mutex mutex;
  39         struct list_head head;
  40         struct i2c_adapter i2c;
  41 };
  42
  43 int nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *);
  44 void nvkm_i2c_bus_release(struct nvkm_i2c_bus *);
  45 int nvkm_i2c_bus_probe(struct nvkm_i2c_bus *, const char *,
  46                        struct nvkm_i2c_bus_probe *,
  47                        bool (*)(struct nvkm_i2c_bus *,
  48                                 struct i2c_board_info *, void *), void *);
  49
  50 struct nvkm_i2c_aux {
  51         const struct nvkm_i2c_aux_func *func;
  52         struct nvkm_i2c_pad *pad;
  53 #define NVKM_I2C_AUX_CCB(n) /* 'n' is ccb index */                           (n)
  54 #define NVKM_I2C_AUX_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x100)
  55         int id;
  56
  57         struct mutex mutex;
  58         struct list_head head;
  59         struct i2c_adapter i2c;
  60
  61         u32 intr;
  62 };
  63
  64 void nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *, bool monitor);
  65 int nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *);
  66 void nvkm_i2c_aux_release(struct nvkm_i2c_aux *);
  67 int nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *, bool retry, u8 type,
  68                       u32 addr, u8 *data, u8 *size);
  69 int nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *, int link_nr, int link_bw,
  70                          bool enhanced_framing);
  71
  72 struct nvkm_i2c {
  73         const struct nvkm_i2c_func *func;
  74         struct nvkm_subdev subdev;
  75
  76         struct list_head pad;
  77         struct list_head bus;
  78         struct list_head aux;
  79
  80         struct nvkm_event event;
  81 };
  82
  83 struct nvkm_i2c_bus *nvkm_i2c_bus_find(struct nvkm_i2c *, int);
  84 struct nvkm_i2c_aux *nvkm_i2c_aux_find(struct nvkm_i2c *, int);
  85
  86 int nv04_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  87 int nv4e_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  88 int nv50_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  89 int g94_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  90 int gf117_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  91 int gf119_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  92 int gk104_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  93 int gm200_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  94
  95 static inline int
  96 nvkm_rdi2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
  97 {
  98         u8 val;
  99         struct i2c_msg msgs[] = {
 100                 { .addr = addr, .flags = 0, .len = 1, .buf = &reg },
 101                 { .addr = addr, .flags = I2C_M_RD, .len = 1, .buf = &val },
 102         };
 103
 104         int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 105         if (ret != 2)
 106                 return -EIO;
 107
 108         return val;
 109 }
 110
 111 static inline int
 112 nv_rd16i2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
 113 {
 114         u8 val[2];
 115         struct i2c_msg msgs[] = {
 116                 { .addr = addr, .flags = 0, .len = 1, .buf = &reg },
 117                 { .addr = addr, .flags = I2C_M_RD, .len = 2, .buf = val },
 118         };
 119
 120         int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 121         if (ret != 2)
 122                 return -EIO;
 123
 124         return val[0] << 8 | val[1];
 125 }
 126
 127 static inline int
 128 nvkm_wri2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u8 val)
 129 {
 130         u8 buf[2] = { reg, val };
 131         struct i2c_msg msgs[] = {
 132                 { .addr = addr, .flags = 0, .len = 2, .buf = buf },
 133         };
 134
 135         int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 136         if (ret != 1)
 137                 return -EIO;
 138
 139         return 0;
 140 }
 141
 142 static inline int
 143 nv_wr16i2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u16 val)
 144 {
 145         u8 buf[3] = { reg, val >> 8, val & 0xff};
 146         struct i2c_msg msgs[] = {
 147                 { .addr = addr, .flags = 0, .len = 3, .buf = buf },
 148         };
 149
 150         int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 151         if (ret != 1)
 152                 return -EIO;
 153
 154         return 0;
 155 }
 156
 157 static inline bool
 158 nvkm_probe_i2c(struct i2c_adapter *adap, u8 addr)
 159 {
 160         return nvkm_rdi2cr(adap, addr, 0) >= 0;
 161 }
 162
 163 static inline int
 164 nvkm_rdaux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
 165 {
 166         const u8 xfer = size;
 167         int ret = nvkm_i2c_aux_acquire(aux);
 168         if (ret == 0) {
 169                 ret = nvkm_i2c_aux_xfer(aux, true, 9, addr, data, &size);
 170                 WARN_ON(!ret && size != xfer);
 171                 nvkm_i2c_aux_release(aux);
 172         }
 173         return ret;
 174 }
 175
 176 static inline int
 177 nvkm_wraux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
 178 {
 179         int ret = nvkm_i2c_aux_acquire(aux);
 180         if (ret == 0) {
 181                 ret = nvkm_i2c_aux_xfer(aux, true, 8, addr, data, &size);
 182                 nvkm_i2c_aux_release(aux);
 183         }
 184         return ret;
 185 }
 186 #endif