i2c.h

  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_bus_probe {
 11	struct i2c_board_info dev;
 12	u8 udelay; /* set to 0 to use the standard delay */
 13};
 14
 15struct nvkm_i2c_bus {
 16	const struct nvkm_i2c_bus_func *func;
 17	struct nvkm_i2c_pad *pad;
 18#define NVKM_I2C_BUS_CCB(n) /* 'n' is ccb index */                           (n)
 19#define NVKM_I2C_BUS_EXT(n) /* 'n' is dcb external encoder type */  ((n) + 0x10)
 20#define NVKM_I2C_BUS_PRI /* ccb primary comm. port */                        -1
 21#define NVKM_I2C_BUS_SEC /* ccb secondary comm. port */                      -2
 22	int id;
 23
 24	struct mutex mutex;
 25	struct list_head head;
 26	struct i2c_adapter i2c;
 27	u8 enabled;
 28};
 29
 30int nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *);
 31void nvkm_i2c_bus_release(struct nvkm_i2c_bus *);
 32int nvkm_i2c_bus_probe(struct nvkm_i2c_bus *, const char *,
 33		       struct nvkm_i2c_bus_probe *,
 34		       bool (*)(struct nvkm_i2c_bus *,
 35			        struct i2c_board_info *, void *), void *);
 36
 37struct nvkm_i2c_aux {
 38	const struct nvkm_i2c_aux_func *func;
 39	struct nvkm_i2c_pad *pad;
 40#define NVKM_I2C_AUX_CCB(n) /* 'n' is ccb index */                           (n)
 41#define NVKM_I2C_AUX_EXT(n) /* 'n' is dcb external encoder type */  ((n) + 0x10)
 42	int id;
 43
 44	struct mutex mutex;
 45	struct list_head head;
 46	struct i2c_adapter i2c;
 47	u8 enabled;
 48
 49	u32 intr;
 50};
 51
 52void nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *, bool monitor);
 53int nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *);
 54void nvkm_i2c_aux_release(struct nvkm_i2c_aux *);
 55int nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *, bool retry, u8 type,
 56		      u32 addr, u8 *data, u8 *size);
 57int nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *, int link_nr, int link_bw,
 58			 bool enhanced_framing);
 59
 60struct nvkm_i2c {
 61	const struct nvkm_i2c_func *func;
 62	struct nvkm_subdev subdev;
 63
 64	struct list_head pad;
 65	struct list_head bus;
 66	struct list_head aux;
 67
 68#define NVKM_I2C_PLUG   BIT(0)
 69#define NVKM_I2C_UNPLUG BIT(1)
 70#define NVKM_I2C_IRQ    BIT(2)
 71#define NVKM_I2C_DONE   BIT(3)
 72#define NVKM_I2C_ANY   (NVKM_I2C_PLUG | NVKM_I2C_UNPLUG | NVKM_I2C_IRQ | NVKM_I2C_DONE)
 73	struct nvkm_event event;
 74};
 75
 76struct nvkm_i2c_bus *nvkm_i2c_bus_find(struct nvkm_i2c *, int);
 77struct nvkm_i2c_aux *nvkm_i2c_aux_find(struct nvkm_i2c *, int);
 78
 79int nv04_i2c_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_i2c **);
 80int nv4e_i2c_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_i2c **);
 81int nv50_i2c_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_i2c **);
 82int g94_i2c_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_i2c **);
 83int gf117_i2c_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_i2c **);
 84int gf119_i2c_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_i2c **);
 85int gk104_i2c_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_i2c **);
 86int gk110_i2c_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_i2c **);
 87int gm200_i2c_new(struct nvkm_device *, enum nvkm_subdev_type, int inst, struct nvkm_i2c **);
 88
 89static inline int
 90nvkm_rdi2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
 91{
 92	u8 val;
 93	struct i2c_msg msgs[] = {
 94		{ .addr = addr, .flags = 0, .len = 1, .buf = &reg },
 95		{ .addr = addr, .flags = I2C_M_RD, .len = 1, .buf = &val },
 96	};
 97
 98	int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 99	if (ret != 2)
100		return -EIO;
101
102	return val;
103}
104
105static inline int
106nv_rd16i2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
107{
108	u8 val[2];
109	struct i2c_msg msgs[] = {
110		{ .addr = addr, .flags = 0, .len = 1, .buf = &reg },
111		{ .addr = addr, .flags = I2C_M_RD, .len = 2, .buf = val },
112	};
113
114	int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
115	if (ret != 2)
116		return -EIO;
117
118	return val[0] << 8 | val[1];
119}
120
121static inline int
122nvkm_wri2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u8 val)
123{
124	u8 buf[2] = { reg, val };
125	struct i2c_msg msgs[] = {
126		{ .addr = addr, .flags = 0, .len = 2, .buf = buf },
127	};
128
129	int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
130	if (ret != 1)
131		return -EIO;
132
133	return 0;
134}
135
136static inline int
137nv_wr16i2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u16 val)
138{
139	u8 buf[3] = { reg, val >> 8, val & 0xff};
140	struct i2c_msg msgs[] = {
141		{ .addr = addr, .flags = 0, .len = 3, .buf = buf },
142	};
143
144	int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
145	if (ret != 1)
146		return -EIO;
147
148	return 0;
149}
150
151static inline bool
152nvkm_probe_i2c(struct i2c_adapter *adap, u8 addr)
153{
154	return nvkm_rdi2cr(adap, addr, 0) >= 0;
155}
156
157static inline int
158nvkm_rdaux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
159{
160	const u8 xfer = size;
161	int ret = nvkm_i2c_aux_acquire(aux);
162	if (ret == 0) {
163		ret = nvkm_i2c_aux_xfer(aux, true, 9, addr, data, &size);
164		WARN_ON(!ret && size != xfer);
165		nvkm_i2c_aux_release(aux);
166	}
167	return ret;
168}
169
170static inline int
171nvkm_wraux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
172{
173	int ret = nvkm_i2c_aux_acquire(aux);
174	if (ret == 0) {
175		ret = nvkm_i2c_aux_xfer(aux, true, 8, addr, data, &size);
176		nvkm_i2c_aux_release(aux);
177	}
178	return ret;
179}
180#endif