linux/drivers/gpu/drm/nouveau/include/nvkm/subdev/i2c.h
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   1/* SPDX-License-Identifier: MIT */
   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
  10struct 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
  20struct nvkm_i2c_ntfy_rep {
  21        u8 mask;
  22};
  23
  24struct nvkm_i2c_bus_probe {
  25        struct i2c_board_info dev;
  26        u8 udelay; /* set to 0 to use the standard delay */
  27};
  28
  29struct 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        u8 enabled;
  42};
  43
  44int nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *);
  45void nvkm_i2c_bus_release(struct nvkm_i2c_bus *);
  46int nvkm_i2c_bus_probe(struct nvkm_i2c_bus *, const char *,
  47                       struct nvkm_i2c_bus_probe *,
  48                       bool (*)(struct nvkm_i2c_bus *,
  49                                struct i2c_board_info *, void *), void *);
  50
  51struct nvkm_i2c_aux {
  52        const struct nvkm_i2c_aux_func *func;
  53        struct nvkm_i2c_pad *pad;
  54#define NVKM_I2C_AUX_CCB(n) /* 'n' is ccb index */                           (n)
  55#define NVKM_I2C_AUX_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x100)
  56        int id;
  57
  58        struct mutex mutex;
  59        struct list_head head;
  60        struct i2c_adapter i2c;
  61        u8 enabled;
  62
  63        u32 intr;
  64};
  65
  66void nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *, bool monitor);
  67int nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *);
  68void nvkm_i2c_aux_release(struct nvkm_i2c_aux *);
  69int nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *, bool retry, u8 type,
  70                      u32 addr, u8 *data, u8 *size);
  71int nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *, int link_nr, int link_bw,
  72                         bool enhanced_framing);
  73
  74struct nvkm_i2c {
  75        const struct nvkm_i2c_func *func;
  76        struct nvkm_subdev subdev;
  77
  78        struct list_head pad;
  79        struct list_head bus;
  80        struct list_head aux;
  81
  82        struct nvkm_event event;
  83};
  84
  85struct nvkm_i2c_bus *nvkm_i2c_bus_find(struct nvkm_i2c *, int);
  86struct nvkm_i2c_aux *nvkm_i2c_aux_find(struct nvkm_i2c *, int);
  87
  88int nv04_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  89int nv4e_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  90int nv50_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  91int g94_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  92int gf117_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  93int gf119_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  94int gk104_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  95int gm200_i2c_new(struct nvkm_device *, int, struct nvkm_i2c **);
  96
  97static inline int
  98nvkm_rdi2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
  99{
 100        u8 val;
 101        struct i2c_msg msgs[] = {
 102                { .addr = addr, .flags = 0, .len = 1, .buf = &reg },
 103                { .addr = addr, .flags = I2C_M_RD, .len = 1, .buf = &val },
 104        };
 105
 106        int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 107        if (ret != 2)
 108                return -EIO;
 109
 110        return val;
 111}
 112
 113static inline int
 114nv_rd16i2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
 115{
 116        u8 val[2];
 117        struct i2c_msg msgs[] = {
 118                { .addr = addr, .flags = 0, .len = 1, .buf = &reg },
 119                { .addr = addr, .flags = I2C_M_RD, .len = 2, .buf = val },
 120        };
 121
 122        int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 123        if (ret != 2)
 124                return -EIO;
 125
 126        return val[0] << 8 | val[1];
 127}
 128
 129static inline int
 130nvkm_wri2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u8 val)
 131{
 132        u8 buf[2] = { reg, val };
 133        struct i2c_msg msgs[] = {
 134                { .addr = addr, .flags = 0, .len = 2, .buf = buf },
 135        };
 136
 137        int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 138        if (ret != 1)
 139                return -EIO;
 140
 141        return 0;
 142}
 143
 144static inline int
 145nv_wr16i2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u16 val)
 146{
 147        u8 buf[3] = { reg, val >> 8, val & 0xff};
 148        struct i2c_msg msgs[] = {
 149                { .addr = addr, .flags = 0, .len = 3, .buf = buf },
 150        };
 151
 152        int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 153        if (ret != 1)
 154                return -EIO;
 155
 156        return 0;
 157}
 158
 159static inline bool
 160nvkm_probe_i2c(struct i2c_adapter *adap, u8 addr)
 161{
 162        return nvkm_rdi2cr(adap, addr, 0) >= 0;
 163}
 164
 165static inline int
 166nvkm_rdaux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
 167{
 168        const u8 xfer = size;
 169        int ret = nvkm_i2c_aux_acquire(aux);
 170        if (ret == 0) {
 171                ret = nvkm_i2c_aux_xfer(aux, true, 9, addr, data, &size);
 172                WARN_ON(!ret && size != xfer);
 173                nvkm_i2c_aux_release(aux);
 174        }
 175        return ret;
 176}
 177
 178static inline int
 179nvkm_wraux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
 180{
 181        int ret = nvkm_i2c_aux_acquire(aux);
 182        if (ret == 0) {
 183                ret = nvkm_i2c_aux_xfer(aux, true, 8, addr, data, &size);
 184                nvkm_i2c_aux_release(aux);
 185        }
 186        return ret;
 187}
 188#endif
 189