// SPDX-License-Identifier: GPL-2.0 /* * Driver for the Texas Instruments DS90UB953 video serializer * * Based on a driver from Luca Ceresoli * * Copyright (c) 2019 Luca Ceresoli * Copyright (c) 2023 Tomi Valkeinen */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define UB953_PAD_SINK 0 #define UB953_PAD_SOURCE 1 #define UB953_NUM_GPIOS 4 #define UB953_DEFAULT_CLKOUT_RATE 25000000UL #define UB953_REG_RESET_CTL 0x01 #define UB953_REG_RESET_CTL_DIGITAL_RESET_1 BIT(1) #define UB953_REG_RESET_CTL_DIGITAL_RESET_0 BIT(0) #define UB953_REG_GENERAL_CFG 0x02 #define UB953_REG_GENERAL_CFG_CONT_CLK BIT(6) #define UB953_REG_GENERAL_CFG_CSI_LANE_SEL_SHIFT 4 #define UB953_REG_GENERAL_CFG_CSI_LANE_SEL_MASK GENMASK(5, 4) #define UB953_REG_GENERAL_CFG_CRC_TX_GEN_ENABLE BIT(1) #define UB953_REG_GENERAL_CFG_I2C_STRAP_MODE BIT(0) #define UB953_REG_MODE_SEL 0x03 #define UB953_REG_MODE_SEL_MODE_DONE BIT(3) #define UB953_REG_MODE_SEL_MODE_OVERRIDE BIT(4) #define UB953_REG_MODE_SEL_MODE_MASK GENMASK(2, 0) #define UB953_REG_CLKOUT_CTRL0 0x06 #define UB953_REG_CLKOUT_CTRL1 0x07 #define UB953_REG_SCL_HIGH_TIME 0x0b #define UB953_REG_SCL_LOW_TIME 0x0c #define UB953_REG_LOCAL_GPIO_DATA 0x0d #define UB953_REG_LOCAL_GPIO_DATA_GPIO_RMTEN(n) BIT(4 + (n)) #define UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(n) BIT(0 + (n)) #define UB953_REG_GPIO_INPUT_CTRL 0x0e #define UB953_REG_GPIO_INPUT_CTRL_OUT_EN(n) BIT(4 + (n)) #define UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(n) BIT(0 + (n)) #define UB953_REG_REV_MASK_ID 0x50 #define UB953_REG_GENERAL_STATUS 0x52 #define UB953_REG_GPIO_PIN_STS 0x53 #define UB953_REG_GPIO_PIN_STS_GPIO_STS(n) BIT(0 + (n)) #define UB953_REG_BIST_ERR_CNT 0x54 #define UB953_REG_CRC_ERR_CNT1 0x55 #define UB953_REG_CRC_ERR_CNT2 0x56 #define UB953_REG_CSI_ERR_CNT 0x5c #define UB953_REG_CSI_ERR_STATUS 0x5d #define UB953_REG_CSI_ERR_DLANE01 0x5e #define UB953_REG_CSI_ERR_DLANE23 0x5f #define UB953_REG_CSI_ERR_CLK_LANE 0x60 #define UB953_REG_CSI_PKT_HDR_VC_ID 0x61 #define UB953_REG_PKT_HDR_WC_LSB 0x62 #define UB953_REG_PKT_HDR_WC_MSB 0x63 #define UB953_REG_CSI_ECC 0x64 #define UB953_REG_IND_ACC_CTL 0xb0 #define UB953_REG_IND_ACC_ADDR 0xb1 #define UB953_REG_IND_ACC_DATA 0xb2 #define UB953_REG_FPD3_RX_ID(n) (0xf0 + (n)) #define UB953_REG_FPD3_RX_ID_LEN 6 /* Indirect register blocks */ #define UB953_IND_TARGET_PAT_GEN 0x00 #define UB953_IND_TARGET_FPD3_TX 0x01 #define UB953_IND_TARGET_DIE_ID 0x02 #define UB953_IND_PGEN_CTL 0x01 #define UB953_IND_PGEN_CTL_PGEN_ENABLE BIT(0) #define UB953_IND_PGEN_CFG 0x02 #define UB953_IND_PGEN_CSI_DI 0x03 #define UB953_IND_PGEN_LINE_SIZE1 0x04 #define UB953_IND_PGEN_LINE_SIZE0 0x05 #define UB953_IND_PGEN_BAR_SIZE1 0x06 #define UB953_IND_PGEN_BAR_SIZE0 0x07 #define UB953_IND_PGEN_ACT_LPF1 0x08 #define UB953_IND_PGEN_ACT_LPF0 0x09 #define UB953_IND_PGEN_TOT_LPF1 0x0a #define UB953_IND_PGEN_TOT_LPF0 0x0b #define UB953_IND_PGEN_LINE_PD1 0x0c #define UB953_IND_PGEN_LINE_PD0 0x0d #define UB953_IND_PGEN_VBP 0x0e #define UB953_IND_PGEN_VFP 0x0f #define UB953_IND_PGEN_COLOR(n) (0x10 + (n)) /* n <= 15 */ /* Note: Only sync mode supported for now */ enum ub953_mode { /* FPD-Link III CSI-2 synchronous mode */ UB953_MODE_SYNC, /* FPD-Link III CSI-2 non-synchronous mode, external ref clock */ UB953_MODE_NONSYNC_EXT, /* FPD-Link III CSI-2 non-synchronous mode, internal ref clock */ UB953_MODE_NONSYNC_INT, /* FPD-Link III DVP mode */ UB953_MODE_DVP, }; struct ub953_hw_data { const char *model; bool is_ub971; }; struct ub953_clkout_data { u32 hs_div; u32 m; u32 n; unsigned long rate; }; struct ub953_data { const struct ub953_hw_data *hw_data; struct i2c_client *client; struct regmap *regmap; struct clk *clkin; u32 num_data_lanes; bool non_continous_clk; struct gpio_chip gpio_chip; struct v4l2_subdev sd; struct media_pad pads[2]; struct v4l2_async_notifier notifier; struct v4l2_subdev *source_sd; u16 source_sd_pad; u64 enabled_source_streams; /* lock for register access */ struct mutex reg_lock; u8 current_indirect_target; struct clk_hw clkout_clk_hw; enum ub953_mode mode; const struct ds90ub9xx_platform_data *plat_data; }; static inline struct ub953_data *sd_to_ub953(struct v4l2_subdev *sd) { return container_of(sd, struct ub953_data, sd); } /* * HW Access */ static int ub953_read(struct ub953_data *priv, u8 reg, u8 *val) { unsigned int v; int ret; mutex_lock(&priv->reg_lock); ret = regmap_read(priv->regmap, reg, &v); if (ret) { dev_err(&priv->client->dev, "Cannot read register 0x%02x: %d\n", reg, ret); goto out_unlock; } *val = v; out_unlock: mutex_unlock(&priv->reg_lock); return ret; } static int ub953_write(struct ub953_data *priv, u8 reg, u8 val) { int ret; mutex_lock(&priv->reg_lock); ret = regmap_write(priv->regmap, reg, val); if (ret) dev_err(&priv->client->dev, "Cannot write register 0x%02x: %d\n", reg, ret); mutex_unlock(&priv->reg_lock); return ret; } static int ub953_select_ind_reg_block(struct ub953_data *priv, u8 block) { struct device *dev = &priv->client->dev; int ret; if (priv->current_indirect_target == block) return 0; ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_CTL, block << 2); if (ret) { dev_err(dev, "%s: cannot select indirect target %u (%d)\n", __func__, block, ret); return ret; } priv->current_indirect_target = block; return 0; } __maybe_unused static int ub953_read_ind(struct ub953_data *priv, u8 block, u8 reg, u8 *val) { unsigned int v; int ret; mutex_lock(&priv->reg_lock); ret = ub953_select_ind_reg_block(priv, block); if (ret) goto out_unlock; ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_ADDR, reg); if (ret) { dev_err(&priv->client->dev, "Write to IND_ACC_ADDR failed when reading %u:%x02x: %d\n", block, reg, ret); goto out_unlock; } ret = regmap_read(priv->regmap, UB953_REG_IND_ACC_DATA, &v); if (ret) { dev_err(&priv->client->dev, "Write to IND_ACC_DATA failed when reading %u:%x02x: %d\n", block, reg, ret); goto out_unlock; } *val = v; out_unlock: mutex_unlock(&priv->reg_lock); return ret; } __maybe_unused static int ub953_write_ind(struct ub953_data *priv, u8 block, u8 reg, u8 val) { int ret; mutex_lock(&priv->reg_lock); ret = ub953_select_ind_reg_block(priv, block); if (ret) goto out_unlock; ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_ADDR, reg); if (ret) { dev_err(&priv->client->dev, "Write to IND_ACC_ADDR failed when writing %u:%x02x: %d\n", block, reg, ret); goto out_unlock; } ret = regmap_write(priv->regmap, UB953_REG_IND_ACC_DATA, val); if (ret) { dev_err(&priv->client->dev, "Write to IND_ACC_DATA failed when writing %u:%x02x\n: %d\n", block, reg, ret); } out_unlock: mutex_unlock(&priv->reg_lock); return ret; } /* * GPIO chip */ static int ub953_gpio_get_direction(struct gpio_chip *gc, unsigned int offset) { struct ub953_data *priv = gpiochip_get_data(gc); int ret; u8 v; ret = ub953_read(priv, UB953_REG_GPIO_INPUT_CTRL, &v); if (ret) return ret; if (v & UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset)) return GPIO_LINE_DIRECTION_IN; else return GPIO_LINE_DIRECTION_OUT; } static int ub953_gpio_direction_in(struct gpio_chip *gc, unsigned int offset) { struct ub953_data *priv = gpiochip_get_data(gc); return regmap_update_bits(priv->regmap, UB953_REG_GPIO_INPUT_CTRL, UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset) | UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset), UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset)); } static int ub953_gpio_direction_out(struct gpio_chip *gc, unsigned int offset, int value) { struct ub953_data *priv = gpiochip_get_data(gc); int ret; ret = regmap_update_bits(priv->regmap, UB953_REG_LOCAL_GPIO_DATA, UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset), value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) : 0); if (ret) return ret; return regmap_update_bits(priv->regmap, UB953_REG_GPIO_INPUT_CTRL, UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(offset) | UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset), UB953_REG_GPIO_INPUT_CTRL_OUT_EN(offset)); } static int ub953_gpio_get(struct gpio_chip *gc, unsigned int offset) { struct ub953_data *priv = gpiochip_get_data(gc); int ret; u8 v; ret = ub953_read(priv, UB953_REG_GPIO_PIN_STS, &v); if (ret) return ret; return !!(v & UB953_REG_GPIO_PIN_STS_GPIO_STS(offset)); } static void ub953_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) { struct ub953_data *priv = gpiochip_get_data(gc); regmap_update_bits(priv->regmap, UB953_REG_LOCAL_GPIO_DATA, UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset), value ? UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(offset) : 0); } static int ub953_gpio_of_xlate(struct gpio_chip *gc, const struct of_phandle_args *gpiospec, u32 *flags) { if (flags) *flags = gpiospec->args[1]; return gpiospec->args[0]; } static int ub953_gpiochip_probe(struct ub953_data *priv) { struct device *dev = &priv->client->dev; struct gpio_chip *gc = &priv->gpio_chip; int ret; /* Set all GPIOs to local input mode */ ub953_write(priv, UB953_REG_LOCAL_GPIO_DATA, 0); ub953_write(priv, UB953_REG_GPIO_INPUT_CTRL, 0xf); gc->label = dev_name(dev); gc->parent = dev; gc->owner = THIS_MODULE; gc->base = -1; gc->can_sleep = true; gc->ngpio = UB953_NUM_GPIOS; gc->get_direction = ub953_gpio_get_direction; gc->direction_input = ub953_gpio_direction_in; gc->direction_output = ub953_gpio_direction_out; gc->get = ub953_gpio_get; gc->set = ub953_gpio_set; gc->of_xlate = ub953_gpio_of_xlate; gc->of_gpio_n_cells = 2; ret = gpiochip_add_data(gc, priv); if (ret) { dev_err(dev, "Failed to add GPIOs: %d\n", ret); return ret; } return 0; } static void ub953_gpiochip_remove(struct ub953_data *priv) { gpiochip_remove(&priv->gpio_chip); } /* * V4L2 */ static int _ub953_set_routing(struct v4l2_subdev *sd, struct v4l2_subdev_state *state, struct v4l2_subdev_krouting *routing) { static const struct v4l2_mbus_framefmt format = { .width = 640, .height = 480, .code = MEDIA_BUS_FMT_UYVY8_1X16, .field = V4L2_FIELD_NONE, .colorspace = V4L2_COLORSPACE_SRGB, .ycbcr_enc = V4L2_YCBCR_ENC_601, .quantization = V4L2_QUANTIZATION_LIM_RANGE, .xfer_func = V4L2_XFER_FUNC_SRGB, }; int ret; /* * Note: we can only support up to V4L2_FRAME_DESC_ENTRY_MAX, until * frame desc is made dynamically allocated. */ if (routing->num_routes > V4L2_FRAME_DESC_ENTRY_MAX) return -EINVAL; ret = v4l2_subdev_routing_validate(sd, routing, V4L2_SUBDEV_ROUTING_ONLY_1_TO_1); if (ret) return ret; ret = v4l2_subdev_set_routing_with_fmt(sd, state, routing, &format); if (ret) return ret; return 0; } static int ub953_set_routing(struct v4l2_subdev *sd, struct v4l2_subdev_state *state, enum v4l2_subdev_format_whence which, struct v4l2_subdev_krouting *routing) { struct ub953_data *priv = sd_to_ub953(sd); if (which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->enabled_source_streams) return -EBUSY; return _ub953_set_routing(sd, state, routing); } static int ub953_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad, struct v4l2_mbus_frame_desc *fd) { struct ub953_data *priv = sd_to_ub953(sd); struct v4l2_mbus_frame_desc source_fd; struct v4l2_subdev_route *route; struct v4l2_subdev_state *state; int ret; if (pad != UB953_PAD_SOURCE) return -EINVAL; ret = v4l2_subdev_call(priv->source_sd, pad, get_frame_desc, priv->source_sd_pad, &source_fd); if (ret) return ret; fd->type = V4L2_MBUS_FRAME_DESC_TYPE_CSI2; state = v4l2_subdev_lock_and_get_active_state(sd); for_each_active_route(&state->routing, route) { struct v4l2_mbus_frame_desc_entry *source_entry = NULL; unsigned int i; if (route->source_pad != pad) continue; for (i = 0; i < source_fd.num_entries; i++) { if (source_fd.entry[i].stream == route->sink_stream) { source_entry = &source_fd.entry[i]; break; } } if (!source_entry) { dev_err(&priv->client->dev, "Failed to find stream from source frame desc\n"); ret = -EPIPE; goto out_unlock; } fd->entry[fd->num_entries].stream = route->source_stream; fd->entry[fd->num_entries].flags = source_entry->flags; fd->entry[fd->num_entries].length = source_entry->length; fd->entry[fd->num_entries].pixelcode = source_entry->pixelcode; fd->entry[fd->num_entries].bus.csi2.vc = source_entry->bus.csi2.vc; fd->entry[fd->num_entries].bus.csi2.dt = source_entry->bus.csi2.dt; fd->num_entries++; } out_unlock: v4l2_subdev_unlock_state(state); return ret; } static int ub953_set_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state, struct v4l2_subdev_format *format) { struct ub953_data *priv = sd_to_ub953(sd); struct v4l2_mbus_framefmt *fmt; if (format->which == V4L2_SUBDEV_FORMAT_ACTIVE && priv->enabled_source_streams) return -EBUSY; /* No transcoding, source and sink formats must match. */ if (format->pad == UB953_PAD_SOURCE) return v4l2_subdev_get_fmt(sd, state, format); /* Set sink format */ fmt = v4l2_subdev_state_get_format(state, format->pad, format->stream); if (!fmt) return -EINVAL; *fmt = format->format; /* Propagate to source format */ fmt = v4l2_subdev_state_get_opposite_stream_format(state, format->pad, format->stream); if (!fmt) return -EINVAL; *fmt = format->format; return 0; } static int ub953_init_state(struct v4l2_subdev *sd, struct v4l2_subdev_state *state) { struct v4l2_subdev_route routes[] = { { .sink_pad = UB953_PAD_SINK, .sink_stream = 0, .source_pad = UB953_PAD_SOURCE, .source_stream = 0, .flags = V4L2_SUBDEV_ROUTE_FL_ACTIVE, }, }; struct v4l2_subdev_krouting routing = { .num_routes = ARRAY_SIZE(routes), .routes = routes, }; return _ub953_set_routing(sd, state, &routing); } static int ub953_log_status(struct v4l2_subdev *sd) { struct ub953_data *priv = sd_to_ub953(sd); struct device *dev = &priv->client->dev; u8 v = 0, v1 = 0, v2 = 0; unsigned int i; char id[UB953_REG_FPD3_RX_ID_LEN]; u8 gpio_local_data = 0; u8 gpio_input_ctrl = 0; u8 gpio_pin_sts = 0; for (i = 0; i < sizeof(id); i++) ub953_read(priv, UB953_REG_FPD3_RX_ID(i), &id[i]); dev_info(dev, "ID '%.*s'\n", (int)sizeof(id), id); ub953_read(priv, UB953_REG_GENERAL_STATUS, &v); dev_info(dev, "GENERAL_STATUS %#02x\n", v); ub953_read(priv, UB953_REG_CRC_ERR_CNT1, &v1); ub953_read(priv, UB953_REG_CRC_ERR_CNT2, &v2); dev_info(dev, "CRC error count %u\n", v1 | (v2 << 8)); ub953_read(priv, UB953_REG_CSI_ERR_CNT, &v); dev_info(dev, "CSI error count %u\n", v); ub953_read(priv, UB953_REG_CSI_ERR_STATUS, &v); dev_info(dev, "CSI_ERR_STATUS %#02x\n", v); ub953_read(priv, UB953_REG_CSI_ERR_DLANE01, &v); dev_info(dev, "CSI_ERR_DLANE01 %#02x\n", v); ub953_read(priv, UB953_REG_CSI_ERR_DLANE23, &v); dev_info(dev, "CSI_ERR_DLANE23 %#02x\n", v); ub953_read(priv, UB953_REG_CSI_ERR_CLK_LANE, &v); dev_info(dev, "CSI_ERR_CLK_LANE %#02x\n", v); ub953_read(priv, UB953_REG_CSI_PKT_HDR_VC_ID, &v); dev_info(dev, "CSI packet header VC %u ID %u\n", v >> 6, v & 0x3f); ub953_read(priv, UB953_REG_PKT_HDR_WC_LSB, &v1); ub953_read(priv, UB953_REG_PKT_HDR_WC_MSB, &v2); dev_info(dev, "CSI packet header WC %u\n", (v2 << 8) | v1); ub953_read(priv, UB953_REG_CSI_ECC, &v); dev_info(dev, "CSI ECC %#02x\n", v); ub953_read(priv, UB953_REG_LOCAL_GPIO_DATA, &gpio_local_data); ub953_read(priv, UB953_REG_GPIO_INPUT_CTRL, &gpio_input_ctrl); ub953_read(priv, UB953_REG_GPIO_PIN_STS, &gpio_pin_sts); for (i = 0; i < UB953_NUM_GPIOS; i++) { dev_info(dev, "GPIO%u: remote: %u is_input: %u is_output: %u val: %u sts: %u\n", i, !!(gpio_local_data & UB953_REG_LOCAL_GPIO_DATA_GPIO_RMTEN(i)), !!(gpio_input_ctrl & UB953_REG_GPIO_INPUT_CTRL_INPUT_EN(i)), !!(gpio_input_ctrl & UB953_REG_GPIO_INPUT_CTRL_OUT_EN(i)), !!(gpio_local_data & UB953_REG_LOCAL_GPIO_DATA_GPIO_OUT_SRC(i)), !!(gpio_pin_sts & UB953_REG_GPIO_PIN_STS_GPIO_STS(i))); } return 0; } static int ub953_enable_streams(struct v4l2_subdev *sd, struct v4l2_subdev_state *state, u32 pad, u64 streams_mask) { struct ub953_data *priv = sd_to_ub953(sd); u64 sink_streams; int ret; sink_streams = v4l2_subdev_state_xlate_streams(state, UB953_PAD_SOURCE, UB953_PAD_SINK, &streams_mask); ret = v4l2_subdev_enable_streams(priv->source_sd, priv->source_sd_pad, sink_streams); if (ret) return ret; priv->enabled_source_streams |= streams_mask; return 0; } static int ub953_disable_streams(struct v4l2_subdev *sd, struct v4l2_subdev_state *state, u32 pad, u64 streams_mask) { struct ub953_data *priv = sd_to_ub953(sd); u64 sink_streams; int ret; sink_streams = v4l2_subdev_state_xlate_streams(state, UB953_PAD_SOURCE, UB953_PAD_SINK, &streams_mask); ret = v4l2_subdev_disable_streams(priv->source_sd, priv->source_sd_pad, sink_streams); if (ret) return ret; priv->enabled_source_streams &= ~streams_mask; return 0; } static const struct v4l2_subdev_pad_ops ub953_pad_ops = { .enable_streams = ub953_enable_streams, .disable_streams = ub953_disable_streams, .set_routing = ub953_set_routing, .get_frame_desc = ub953_get_frame_desc, .get_fmt = v4l2_subdev_get_fmt, .set_fmt = ub953_set_fmt, }; static const struct v4l2_subdev_core_ops ub953_subdev_core_ops = { .log_status = ub953_log_status, }; static const struct v4l2_subdev_ops ub953_subdev_ops = { .core = &ub953_subdev_core_ops, .pad = &ub953_pad_ops, }; static const struct v4l2_subdev_internal_ops ub953_internal_ops = { .init_state = ub953_init_state, }; static const struct media_entity_operations ub953_entity_ops = { .link_validate = v4l2_subdev_link_validate, }; static int ub953_notify_bound(struct v4l2_async_notifier *notifier, struct v4l2_subdev *source_subdev, struct v4l2_async_connection *asd) { struct ub953_data *priv = sd_to_ub953(notifier->sd); struct device *dev = &priv->client->dev; int ret; ret = media_entity_get_fwnode_pad(&source_subdev->entity, source_subdev->fwnode, MEDIA_PAD_FL_SOURCE); if (ret < 0) { dev_err(dev, "Failed to find pad for %s\n", source_subdev->name); return ret; } priv->source_sd = source_subdev; priv->source_sd_pad = ret; ret = media_create_pad_link(&source_subdev->entity, priv->source_sd_pad, &priv->sd.entity, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE); if (ret) { dev_err(dev, "Unable to link %s:%u -> %s:0\n", source_subdev->name, priv->source_sd_pad, priv->sd.name); return ret; } return 0; } static const struct v4l2_async_notifier_operations ub953_notify_ops = { .bound = ub953_notify_bound, }; static int ub953_v4l2_notifier_register(struct ub953_data *priv) { struct device *dev = &priv->client->dev; struct v4l2_async_connection *asd; struct fwnode_handle *ep_fwnode; int ret; ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), UB953_PAD_SINK, 0, 0); if (!ep_fwnode) { dev_err(dev, "No graph endpoint\n"); return -ENODEV; } v4l2_async_subdev_nf_init(&priv->notifier, &priv->sd); asd = v4l2_async_nf_add_fwnode_remote(&priv->notifier, ep_fwnode, struct v4l2_async_connection); fwnode_handle_put(ep_fwnode); if (IS_ERR(asd)) { dev_err(dev, "Failed to add subdev: %ld", PTR_ERR(asd)); v4l2_async_nf_cleanup(&priv->notifier); return PTR_ERR(asd); } priv->notifier.ops = &ub953_notify_ops; ret = v4l2_async_nf_register(&priv->notifier); if (ret) { dev_err(dev, "Failed to register subdev_notifier"); v4l2_async_nf_cleanup(&priv->notifier); return ret; } return 0; } static void ub953_v4l2_notifier_unregister(struct ub953_data *priv) { v4l2_async_nf_unregister(&priv->notifier); v4l2_async_nf_cleanup(&priv->notifier); } /* * Probing */ static int ub953_i2c_master_init(struct ub953_data *priv) { /* i2c fast mode */ u32 ref = 26250000; u32 scl_high = 915; /* ns */ u32 scl_low = 1641; /* ns */ int ret; scl_high = div64_u64((u64)scl_high * ref, 1000000000) - 5; scl_low = div64_u64((u64)scl_low * ref, 1000000000) - 5; ret = ub953_write(priv, UB953_REG_SCL_HIGH_TIME, scl_high); if (ret) return ret; ret = ub953_write(priv, UB953_REG_SCL_LOW_TIME, scl_low); if (ret) return ret; return 0; } static u64 ub953_get_fc_rate(struct ub953_data *priv) { switch (priv->mode) { case UB953_MODE_SYNC: if (priv->hw_data->is_ub971) return priv->plat_data->bc_rate * 160ull; else return priv->plat_data->bc_rate / 2 * 160ull; case UB953_MODE_NONSYNC_EXT: /* CLKIN_DIV = 1 always */ return clk_get_rate(priv->clkin) * 80ull; default: /* Not supported */ return 0; } } static unsigned long ub953_calc_clkout_ub953(struct ub953_data *priv, unsigned long target, u64 fc, u8 *hs_div, u8 *m, u8 *n) { /* * We always use 4 as a pre-divider (HS_CLK_DIV = 2). * * According to the datasheet: * - "HS_CLK_DIV typically should be set to either 16, 8, or 4 (default)." * - "if it is not possible to have an integer ratio of N/M, it is best to * select a smaller value for HS_CLK_DIV. * * For above reasons the default HS_CLK_DIV seems the best in the average * case. Use always that value to keep the code simple. */ static const unsigned long hs_clk_div = 4; u64 fc_divided; unsigned long mul, div; unsigned long res; /* clkout = fc / hs_clk_div * m / n */ fc_divided = div_u64(fc, hs_clk_div); rational_best_approximation(target, fc_divided, (1 << 5) - 1, (1 << 8) - 1, &mul, &div); res = div_u64(fc_divided * mul, div); *hs_div = hs_clk_div; *m = mul; *n = div; return res; } static unsigned long ub953_calc_clkout_ub971(struct ub953_data *priv, unsigned long target, u64 fc, u8 *m, u8 *n) { u64 fc_divided; unsigned long mul, div; unsigned long res; /* clkout = fc * m / (8 * n) */ fc_divided = div_u64(fc, 8); rational_best_approximation(target, fc_divided, (1 << 5) - 1, (1 << 8) - 1, &mul, &div); res = div_u64(fc_divided * mul, div); *m = mul; *n = div; return res; } static void ub953_calc_clkout_params(struct ub953_data *priv, unsigned long target_rate, struct ub953_clkout_data *clkout_data) { struct device *dev = &priv->client->dev; unsigned long clkout_rate; u64 fc_rate; fc_rate = ub953_get_fc_rate(priv); if (priv->hw_data->is_ub971) { u8 m, n; clkout_rate = ub953_calc_clkout_ub971(priv, target_rate, fc_rate, &m, &n); clkout_data->m = m; clkout_data->n = n; dev_dbg(dev, "%s %llu * %u / (8 * %u) = %lu (requested %lu)", __func__, fc_rate, m, n, clkout_rate, target_rate); } else { u8 hs_div, m, n; clkout_rate = ub953_calc_clkout_ub953(priv, target_rate, fc_rate, &hs_div, &m, &n); clkout_data->hs_div = hs_div; clkout_data->m = m; clkout_data->n = n; dev_dbg(dev, "%s %llu / %u * %u / %u = %lu (requested %lu)", __func__, fc_rate, hs_div, m, n, clkout_rate, target_rate); } clkout_data->rate = clkout_rate; } static void ub953_write_clkout_regs(struct ub953_data *priv, const struct ub953_clkout_data *clkout_data) { u8 clkout_ctrl0, clkout_ctrl1; if (priv->hw_data->is_ub971) clkout_ctrl0 = clkout_data->m; else clkout_ctrl0 = (__ffs(clkout_data->hs_div) << 5) | clkout_data->m; clkout_ctrl1 = clkout_data->n; ub953_write(priv, UB953_REG_CLKOUT_CTRL0, clkout_ctrl0); ub953_write(priv, UB953_REG_CLKOUT_CTRL1, clkout_ctrl1); } static unsigned long ub953_clkout_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw); struct device *dev = &priv->client->dev; u8 ctrl0, ctrl1; u32 mul, div; u64 fc_rate; u32 hs_clk_div; u64 rate; int ret; ret = ub953_read(priv, UB953_REG_CLKOUT_CTRL0, &ctrl0); if (ret) { dev_err(dev, "Failed to read CLKOUT_CTRL0: %d\n", ret); return 0; } ret = ub953_read(priv, UB953_REG_CLKOUT_CTRL1, &ctrl1); if (ret) { dev_err(dev, "Failed to read CLKOUT_CTRL1: %d\n", ret); return 0; } fc_rate = ub953_get_fc_rate(priv); if (priv->hw_data->is_ub971) { mul = ctrl0 & 0x1f; div = ctrl1; if (div == 0) return 0; rate = div_u64(fc_rate * mul, 8 * div); dev_dbg(dev, "clkout: fc rate %llu, mul %u, div %u = %llu\n", fc_rate, mul, div, rate); } else { mul = ctrl0 & 0x1f; hs_clk_div = 1 << (ctrl0 >> 5); div = ctrl1; if (div == 0) return 0; rate = div_u64(div_u64(fc_rate, hs_clk_div) * mul, div); dev_dbg(dev, "clkout: fc rate %llu, hs_clk_div %u, mul %u, div %u = %llu\n", fc_rate, hs_clk_div, mul, div, rate); } return rate; } static long ub953_clkout_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *parent_rate) { struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw); struct ub953_clkout_data clkout_data; ub953_calc_clkout_params(priv, rate, &clkout_data); return clkout_data.rate; } static int ub953_clkout_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct ub953_data *priv = container_of(hw, struct ub953_data, clkout_clk_hw); struct ub953_clkout_data clkout_data; ub953_calc_clkout_params(priv, rate, &clkout_data); dev_dbg(&priv->client->dev, "%s %lu (requested %lu)\n", __func__, clkout_data.rate, rate); ub953_write_clkout_regs(priv, &clkout_data); return 0; } static const struct clk_ops ub953_clkout_ops = { .recalc_rate = ub953_clkout_recalc_rate, .round_rate = ub953_clkout_round_rate, .set_rate = ub953_clkout_set_rate, }; static int ub953_register_clkout(struct ub953_data *priv) { struct device *dev = &priv->client->dev; const struct clk_init_data init = { .name = kasprintf(GFP_KERNEL, "ds90%s.%s.clk_out", priv->hw_data->model, dev_name(dev)), .ops = &ub953_clkout_ops, }; struct ub953_clkout_data clkout_data; int ret; if (!init.name) return -ENOMEM; /* Initialize clkout to 25MHz by default */ ub953_calc_clkout_params(priv, UB953_DEFAULT_CLKOUT_RATE, &clkout_data); ub953_write_clkout_regs(priv, &clkout_data); priv->clkout_clk_hw.init = &init; ret = devm_clk_hw_register(dev, &priv->clkout_clk_hw); kfree(init.name); if (ret) return dev_err_probe(dev, ret, "Cannot register clock HW\n"); ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &priv->clkout_clk_hw); if (ret) return dev_err_probe(dev, ret, "Cannot add OF clock provider\n"); return 0; } static int ub953_add_i2c_adapter(struct ub953_data *priv) { struct device *dev = &priv->client->dev; struct fwnode_handle *i2c_handle; int ret; i2c_handle = device_get_named_child_node(dev, "i2c"); if (!i2c_handle) return 0; ret = i2c_atr_add_adapter(priv->plat_data->atr, priv->plat_data->port, dev, i2c_handle); fwnode_handle_put(i2c_handle); if (ret) return ret; return 0; } static const struct regmap_config ub953_regmap_config = { .name = "ds90ub953", .reg_bits = 8, .val_bits = 8, .reg_format_endian = REGMAP_ENDIAN_DEFAULT, .val_format_endian = REGMAP_ENDIAN_DEFAULT, }; static int ub953_parse_dt(struct ub953_data *priv) { struct device *dev = &priv->client->dev; struct v4l2_fwnode_endpoint vep = { .bus_type = V4L2_MBUS_CSI2_DPHY, }; struct fwnode_handle *ep_fwnode; unsigned char nlanes; int ret; ep_fwnode = fwnode_graph_get_endpoint_by_id(dev_fwnode(dev), UB953_PAD_SINK, 0, 0); if (!ep_fwnode) return dev_err_probe(dev, -ENOENT, "no endpoint found\n"); ret = v4l2_fwnode_endpoint_parse(ep_fwnode, &vep); fwnode_handle_put(ep_fwnode); if (ret) return dev_err_probe(dev, ret, "failed to parse sink endpoint data\n"); nlanes = vep.bus.mipi_csi2.num_data_lanes; if (nlanes != 1 && nlanes != 2 && nlanes != 4) return dev_err_probe(dev, -EINVAL, "bad number of data-lanes: %u\n", nlanes); priv->num_data_lanes = nlanes; priv->non_continous_clk = vep.bus.mipi_csi2.flags & V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK; return 0; } static int ub953_hw_init(struct ub953_data *priv) { struct device *dev = &priv->client->dev; bool mode_override; int ret; u8 v; ret = ub953_read(priv, UB953_REG_MODE_SEL, &v); if (ret) return ret; if (!(v & UB953_REG_MODE_SEL_MODE_DONE)) return dev_err_probe(dev, -EIO, "Mode value not stabilized\n"); mode_override = v & UB953_REG_MODE_SEL_MODE_OVERRIDE; switch (v & UB953_REG_MODE_SEL_MODE_MASK) { case 0: priv->mode = UB953_MODE_SYNC; break; case 2: priv->mode = UB953_MODE_NONSYNC_EXT; break; case 3: priv->mode = UB953_MODE_NONSYNC_INT; break; case 5: priv->mode = UB953_MODE_DVP; break; default: return dev_err_probe(dev, -EIO, "Invalid mode in mode register\n"); } dev_dbg(dev, "mode from %s: %#x\n", mode_override ? "reg" : "strap", priv->mode); if (priv->mode != UB953_MODE_SYNC && priv->mode != UB953_MODE_NONSYNC_EXT) return dev_err_probe(dev, -ENODEV, "Unsupported mode selected: %u\n", priv->mode); if (priv->mode == UB953_MODE_NONSYNC_EXT && !priv->clkin) return dev_err_probe(dev, -EINVAL, "clkin required for non-sync ext mode\n"); ret = ub953_read(priv, UB953_REG_REV_MASK_ID, &v); if (ret) return dev_err_probe(dev, ret, "Failed to read revision"); dev_info(dev, "Found %s rev/mask %#04x\n", priv->hw_data->model, v); ret = ub953_read(priv, UB953_REG_GENERAL_CFG, &v); if (ret) return ret; dev_dbg(dev, "i2c strap setting %s V\n", (v & UB953_REG_GENERAL_CFG_I2C_STRAP_MODE) ? "1.8" : "3.3"); ret = ub953_i2c_master_init(priv); if (ret) return dev_err_probe(dev, ret, "i2c init failed\n"); ub953_write(priv, UB953_REG_GENERAL_CFG, (priv->non_continous_clk ? 0 : UB953_REG_GENERAL_CFG_CONT_CLK) | ((priv->num_data_lanes - 1) << UB953_REG_GENERAL_CFG_CSI_LANE_SEL_SHIFT) | UB953_REG_GENERAL_CFG_CRC_TX_GEN_ENABLE); return 0; } static int ub953_subdev_init(struct ub953_data *priv) { struct device *dev = &priv->client->dev; int ret; v4l2_i2c_subdev_init(&priv->sd, priv->client, &ub953_subdev_ops); priv->sd.internal_ops = &ub953_internal_ops; priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_STREAMS; priv->sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE; priv->sd.entity.ops = &ub953_entity_ops; priv->pads[0].flags = MEDIA_PAD_FL_SINK; priv->pads[1].flags = MEDIA_PAD_FL_SOURCE; ret = media_entity_pads_init(&priv->sd.entity, 2, priv->pads); if (ret) return dev_err_probe(dev, ret, "Failed to init pads\n"); ret = v4l2_subdev_init_finalize(&priv->sd); if (ret) goto err_entity_cleanup; ret = ub953_v4l2_notifier_register(priv); if (ret) { dev_err_probe(dev, ret, "v4l2 subdev notifier register failed\n"); goto err_free_state; } ret = v4l2_async_register_subdev(&priv->sd); if (ret) { dev_err_probe(dev, ret, "v4l2_async_register_subdev error\n"); goto err_unreg_notif; } return 0; err_unreg_notif: ub953_v4l2_notifier_unregister(priv); err_free_state: v4l2_subdev_cleanup(&priv->sd); err_entity_cleanup: media_entity_cleanup(&priv->sd.entity); return ret; } static void ub953_subdev_uninit(struct ub953_data *priv) { v4l2_async_unregister_subdev(&priv->sd); ub953_v4l2_notifier_unregister(priv); v4l2_subdev_cleanup(&priv->sd); fwnode_handle_put(priv->sd.fwnode); media_entity_cleanup(&priv->sd.entity); } static int ub953_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct ub953_data *priv; int ret; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->client = client; priv->hw_data = device_get_match_data(dev); priv->plat_data = dev_get_platdata(&client->dev); if (!priv->plat_data) return dev_err_probe(dev, -ENODEV, "Platform data missing\n"); mutex_init(&priv->reg_lock); /* * Initialize to invalid values so that the first reg writes will * configure the target. */ priv->current_indirect_target = 0xff; priv->regmap = devm_regmap_init_i2c(client, &ub953_regmap_config); if (IS_ERR(priv->regmap)) { ret = PTR_ERR(priv->regmap); dev_err_probe(dev, ret, "Failed to init regmap\n"); goto err_mutex_destroy; } priv->clkin = devm_clk_get_optional(dev, "clkin"); if (IS_ERR(priv->clkin)) { ret = PTR_ERR(priv->clkin); dev_err_probe(dev, ret, "failed to parse 'clkin'\n"); goto err_mutex_destroy; } ret = ub953_parse_dt(priv); if (ret) goto err_mutex_destroy; ret = ub953_hw_init(priv); if (ret) goto err_mutex_destroy; ret = ub953_gpiochip_probe(priv); if (ret) { dev_err_probe(dev, ret, "Failed to init gpiochip\n"); goto err_mutex_destroy; } ret = ub953_register_clkout(priv); if (ret) { dev_err_probe(dev, ret, "Failed to register clkout\n"); goto err_gpiochip_remove; } ret = ub953_subdev_init(priv); if (ret) goto err_gpiochip_remove; ret = ub953_add_i2c_adapter(priv); if (ret) { dev_err_probe(dev, ret, "failed to add remote i2c adapter\n"); goto err_subdev_uninit; } return 0; err_subdev_uninit: ub953_subdev_uninit(priv); err_gpiochip_remove: ub953_gpiochip_remove(priv); err_mutex_destroy: mutex_destroy(&priv->reg_lock); return ret; } static void ub953_remove(struct i2c_client *client) { struct v4l2_subdev *sd = i2c_get_clientdata(client); struct ub953_data *priv = sd_to_ub953(sd); i2c_atr_del_adapter(priv->plat_data->atr, priv->plat_data->port); ub953_subdev_uninit(priv); ub953_gpiochip_remove(priv); mutex_destroy(&priv->reg_lock); } static const struct ub953_hw_data ds90ub953_hw = { .model = "ub953", }; static const struct ub953_hw_data ds90ub971_hw = { .model = "ub971", .is_ub971 = true, }; static const struct i2c_device_id ub953_id[] = { { "ds90ub953-q1", (kernel_ulong_t)&ds90ub953_hw }, { "ds90ub971-q1", (kernel_ulong_t)&ds90ub971_hw }, {} }; MODULE_DEVICE_TABLE(i2c, ub953_id); static const struct of_device_id ub953_dt_ids[] = { { .compatible = "ti,ds90ub953-q1", .data = &ds90ub953_hw }, { .compatible = "ti,ds90ub971-q1", .data = &ds90ub971_hw }, {} }; MODULE_DEVICE_TABLE(of, ub953_dt_ids); static struct i2c_driver ds90ub953_driver = { .probe = ub953_probe, .remove = ub953_remove, .id_table = ub953_id, .driver = { .name = "ds90ub953", .of_match_table = ub953_dt_ids, }, }; module_i2c_driver(ds90ub953_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Texas Instruments FPD-Link III/IV CSI-2 Serializers Driver"); MODULE_AUTHOR("Luca Ceresoli "); MODULE_AUTHOR("Tomi Valkeinen "); MODULE_IMPORT_NS("I2C_ATR");