--- /dev/null
+/*
+ * csiphy.c
+ *
+ * Qualcomm MSM Camera Subsystem - CSIPHY Module
+ *
+ * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2016 Linaro Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <media/media-entity.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-subdev.h>
+
+#include "csiphy.h"
+#include "camss.h"
+
+#define MSM_CSIPHY_NAME "msm_csiphy"
+
+#define CAMSS_CSI_PHY_LNn_CFG2(n) (0x004 + 0x40 * (n))
+#define CAMSS_CSI_PHY_LNn_CFG3(n) (0x008 + 0x40 * (n))
+#define CAMSS_CSI_PHY_LNn_MISC1(n) (0x028 + 0x40 * (n))
+#define CAMSS_CSI_PHY_LNn_TEST_IMP(n) (0x01c + 0x40 * (n))
+#define CAMSS_CSI_PHY_GLBL_RESET 0x140
+#define CAMSS_CSI_PHY_GLBL_PWR_CFG 0x144
+#define CAMSS_CSI_PHY_GLBL_IRQ_CMD 0x164
+#define CAMSS_CSI_PHY_HW_VERSION 0x188
+#define CAMSS_CSI_PHY_INTERRUPT_STATUSn(n) (0x18c + 0x4 * (n))
+#define CAMSS_CSI_PHY_INTERRUPT_MASKn(n) (0x1ac + 0x4 * (n))
+#define CAMSS_CSI_PHY_INTERRUPT_CLEARn(n) (0x1cc + 0x4 * (n))
+#define CAMSS_CSI_PHY_GLBL_T_INIT_CFG0 0x1ec
+#define CAMSS_CSI_PHY_T_WAKEUP_CFG0 0x1f4
+
+/*
+ * csiphy_isr - CSIPHY module interrupt handler
+ * @irq: Interrupt line
+ * @dev: CSIPHY device
+ *
+ * Return IRQ_HANDLED on success
+ */
+static irqreturn_t csiphy_isr(int irq, void *dev)
+{
+ struct csiphy_device *csiphy = dev;
+ u8 val[8];
+ u8 i;
+
+ for (i = 0; i < 8; i++) {
+ val[i] = readl_relaxed(csiphy->base +
+ CAMSS_CSI_PHY_INTERRUPT_STATUSn(i));
+ writel_relaxed(val[i], csiphy->base +
+ CAMSS_CSI_PHY_INTERRUPT_CLEARn(i));
+ writel_relaxed(0x1, csiphy->base + CAMSS_CSI_PHY_GLBL_IRQ_CMD);
+ writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_IRQ_CMD);
+ writel_relaxed(0x0, csiphy->base +
+ CAMSS_CSI_PHY_INTERRUPT_CLEARn(i));
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
+ * csiphy_reset - Perform software reset on CSIPHY module
+ * @csiphy: CSIPHY device
+ */
+static void csiphy_reset(struct csiphy_device *csiphy)
+{
+ writel_relaxed(0x1, csiphy->base + CAMSS_CSI_PHY_GLBL_RESET);
+ usleep_range(5000, 8000);
+ writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_RESET);
+}
+
+/*
+ * csiphy_enable_clocks - Enable clocks for CSIPHY module and
+ * set clock rates where needed
+ * @csiphy: CSIPHY device
+ *
+ * Return 0 on success or a negative error code otherwise
+ */
+static int csiphy_enable_clocks(struct csiphy_device *csiphy)
+{
+ long clk_rate;
+ int ret;
+ int i;
+
+ for (i = 0; i < csiphy->nclocks; i++) {
+ if (csiphy->clock_rate[i]) {
+ clk_rate = clk_round_rate(csiphy->clock[i],
+ csiphy->clock_rate[i]);
+ if (clk_rate < 0) {
+ dev_err(csiphy->camss->dev, "round failed\n");
+ ret = clk_rate;
+ goto error;
+ }
+ ret = clk_set_rate(csiphy->clock[i], clk_rate);
+ if (ret < 0) {
+ dev_err(csiphy->camss->dev, "set rate failed\n");
+ goto error;
+ }
+ }
+ ret = clk_prepare_enable(csiphy->clock[i]);
+ if (ret) {
+ dev_err(csiphy->camss->dev, "clk enable failed\n");
+ goto error;
+ }
+ }
+
+ return 0;
+
+error:
+ for (i--; i >= 0; i--)
+ clk_disable_unprepare(csiphy->clock[i]);
+
+ return ret;
+}
+
+/*
+ * csiphy_disable_clocks - Disable clocks for CSIPHY module
+ * @csiphy: CSIPHY device
+ */
+static void csiphy_disable_clocks(struct csiphy_device *csiphy)
+{
+ int i;
+
+ for (i = csiphy->nclocks - 1; i >= 0; i--)
+ clk_disable_unprepare(csiphy->clock[i]);
+}
+
+/*
+ * csiphy_set_power - Power on/off CSIPHY module
+ * @sd: CSIPHY V4L2 subdevice
+ * @on: Requested power state
+ *
+ * Return 0 on success or a negative error code otherwise
+ */
+static int csiphy_set_power(struct v4l2_subdev *sd, int on)
+{
+ struct csiphy_device *csiphy = v4l2_get_subdevdata(sd);
+ int ret;
+
+ dev_err(csiphy->camss->dev, "%s: Enter, csiphy%d on = %d\n",
+ __func__, csiphy->id, on);
+
+ if (on) {
+ u8 hw_version;
+
+ ret = csiphy_enable_clocks(csiphy);
+ if (ret < 0)
+ return ret;
+
+ enable_irq(csiphy->irq);
+
+ csiphy_reset(csiphy);
+
+ hw_version = readl(csiphy->base + CAMSS_CSI_PHY_HW_VERSION);
+ dev_err(csiphy->camss->dev, "CSIPHY HW Version = 0x%02x\n",
+ hw_version);
+ } else {
+ disable_irq(csiphy->irq);
+
+ csiphy_disable_clocks(csiphy);
+ }
+
+ dev_err(csiphy->camss->dev, "%s: Exit csiphy%d on = %d\n",
+ __func__, csiphy->id, on);
+
+ return 0;
+}
+
+/*
+ * csiphy_get_lane_mask - Calculate CSI2 lane mask configuration parameter
+ * @lane_cfg - CSI2 lane configuration
+ *
+ * Return lane mask
+ */
+static int csiphy_get_lane_mask(struct camss_csiphy_lanes_cfg *lane_cfg)
+{
+ u16 lane_mask;
+ int i;
+
+ lane_mask = 1 << lane_cfg->clk.pos;
+
+ for (i = 0; i < lane_cfg->num_data; i++)
+ lane_mask |= 1 << lane_cfg->data[i].pos;
+
+ return lane_mask;
+}
+
+/*
+ * csiphy_set_stream - Enable/disable streaming on CSIPHY module
+ * @sd: CSIPHY V4L2 subdevice
+ * @enable: Requested streaming state
+ *
+ * Main configuration of CSIPHY module is also done here.
+ *
+ * Return 0 on success or a negative error code otherwise
+ */
+static int csiphy_set_stream(struct v4l2_subdev *sd, int enable)
+{
+ struct csiphy_device *csiphy = v4l2_get_subdevdata(sd);
+ struct csiphy_config *cfg = &csiphy->cfg;
+ u16 lane_mask = csiphy_get_lane_mask(&cfg->csi2->lanecfg);
+ u8 i;
+ u8 val;
+
+ dev_err(csiphy->camss->dev, "%s: Enter, csiphy%d enable = %d\n",
+ __func__, csiphy->id, enable);
+
+ if (enable) {
+ val = readl(csiphy->base_clk_mux);
+ if (cfg->combo_mode && (lane_mask & 0x18) == 0x18) {
+ val &= ~0xf0;
+ val |= cfg->csid_id << 4;
+ } else {
+ val &= ~0xf;
+ val |= cfg->csid_id;
+ }
+ writel_relaxed(val, csiphy->base_clk_mux);
+
+ writel_relaxed(0x1, csiphy->base +
+ CAMSS_CSI_PHY_GLBL_T_INIT_CFG0);
+ writel_relaxed(0x1, csiphy->base +
+ CAMSS_CSI_PHY_T_WAKEUP_CFG0);
+
+ val = 0x1;
+ val |= lane_mask << 1;
+ writel_relaxed(val, csiphy->base + CAMSS_CSI_PHY_GLBL_PWR_CFG);
+
+ val = cfg->combo_mode << 4;
+ writel_relaxed(val, csiphy->base + CAMSS_CSI_PHY_GLBL_RESET);
+
+ lane_mask &= 0x1f;
+ i = 0;
+ while (lane_mask & 0x1f) {
+ if (!(lane_mask & 0x1)) {
+ i++;
+ lane_mask >>= 1;
+ continue;
+ }
+
+ writel_relaxed(0x10, csiphy->base +
+ CAMSS_CSI_PHY_LNn_CFG2(i));
+ writel_relaxed(cfg->csi2->settle_cnt, csiphy->base +
+ CAMSS_CSI_PHY_LNn_CFG3(i));
+
+ writel_relaxed(0x3f, csiphy->base +
+ CAMSS_CSI_PHY_INTERRUPT_MASKn(i));
+ writel_relaxed(0x3f, csiphy->base +
+ CAMSS_CSI_PHY_INTERRUPT_CLEARn(i));
+
+ i++;
+ lane_mask >>= 1;
+ }
+ } else {
+ i = 0;
+ while (lane_mask) {
+ if (lane_mask & 0x1) {
+ writel_relaxed(0x0, csiphy->base +
+ CAMSS_CSI_PHY_LNn_CFG2(i));
+ writel_relaxed(0x0, csiphy->base +
+ CAMSS_CSI_PHY_LNn_MISC1(i));
+ writel_relaxed(0x0, csiphy->base +
+ CAMSS_CSI_PHY_LNn_TEST_IMP(i));
+ }
+
+ lane_mask >>= 1;
+ i++;
+ }
+
+ writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_LNn_CFG2(4));
+ writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_PWR_CFG);
+ }
+
+ return 0;
+}
+
+/*
+ * __csiphy_get_format - Get pointer to format structure
+ * @csiphy: CSIPHY device
+ * @cfg: V4L2 subdev pad configuration
+ * @pad: pad from which format is requested
+ * @which: TRY or ACTIVE format
+ *
+ * Return pointer to TRY or ACTIVE format structure
+ */
+static struct v4l2_mbus_framefmt *
+__csiphy_get_format(struct csiphy_device *csiphy,
+ struct v4l2_subdev_pad_config *cfg,
+ unsigned int pad,
+ enum v4l2_subdev_format_whence which)
+{
+ if (which == V4L2_SUBDEV_FORMAT_TRY)
+ return v4l2_subdev_get_try_format(&csiphy->subdev, cfg, pad);
+
+ return &csiphy->fmt[pad];
+}
+
+/*
+ * csiphy_get_format - Handle get format by pads subdev method
+ * @sd: CSIPHY V4L2 subdevice
+ * @cfg: V4L2 subdev pad configuration
+ * @fmt: pointer to v4l2 subdev format structure
+ *
+ * Return -EINVAL or zero on success
+ */
+static int csiphy_get_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *fmt)
+{
+ struct csiphy_device *csiphy = v4l2_get_subdevdata(sd);
+ struct v4l2_mbus_framefmt *format;
+
+ format = __csiphy_get_format(csiphy, cfg, fmt->pad, fmt->which);
+ if (format == NULL)
+ return -EINVAL;
+
+ fmt->format = *format;
+
+ return 0;
+}
+
+/*
+ * csiphy_set_format - Handle set format by pads subdev method
+ * @sd: CSIPHY V4L2 subdevice
+ * @cfg: V4L2 subdev pad configuration
+ * @fmt: pointer to v4l2 subdev format structure
+ *
+ * Return -EINVAL or zero on success
+ */
+static int csiphy_set_format(struct v4l2_subdev *sd,
+ struct v4l2_subdev_pad_config *cfg,
+ struct v4l2_subdev_format *fmt)
+{
+ struct csiphy_device *csiphy = v4l2_get_subdevdata(sd);
+ struct v4l2_mbus_framefmt *format;
+
+ if (fmt->pad == MSM_CSIPHY_PAD_SINK) {
+ /* Set format on sink pad */
+ format = __csiphy_get_format(csiphy, cfg, fmt->pad,
+ fmt->which);
+ if (format == NULL)
+ return -EINVAL;
+
+ *format = fmt->format;
+
+ /* Reset format on source pad */
+ format = __csiphy_get_format(csiphy, cfg, MSM_CSIPHY_PAD_SRC,
+ fmt->which);
+ if (format == NULL)
+ return -EINVAL;
+
+ *format = fmt->format;
+ } else {
+ /* Source pad format must be same as sink pad format, */
+ /* so just return source pad format */
+ format = __csiphy_get_format(csiphy, cfg, fmt->pad, fmt->which);
+ if (format == NULL)
+ return -EINVAL;
+
+ fmt->format = *format;
+ }
+
+ return 0;
+}
+
+/*
+ * msm_csiphy_subdev_init - Initialize CSIPHY device structure and resources
+ * @csiphy: CSIPHY device
+ * @camss: Camera sub-system structure
+ * @res: CSIPHY module resources table
+ * @id: CSIPHY module id
+ *
+ * Return 0 on success or a negative error code otherwise
+ */
+int msm_csiphy_subdev_init(struct csiphy_device *csiphy, struct camss *camss,
+ struct resources *res, u8 id)
+{
+ struct device *dev = camss->dev;
+ struct platform_device *pdev = container_of(dev, struct platform_device, dev);
+ struct resource *r;
+ int i;
+ int ret;
+
+ csiphy->camss = camss;
+
+ dev_err(csiphy->camss->dev, "%s: Enter\n", __func__);
+
+ csiphy->id = id;
+
+ csiphy->cfg.combo_mode = 0;
+
+ /* Memory */
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, res->reg[0]);
+ csiphy->base = devm_ioremap_resource(dev, r);
+ if (IS_ERR(csiphy->base)) {
+ dev_err(dev, "could not map memory\n");
+ return PTR_ERR(csiphy->base);
+ }
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_MEM, res->reg[1]);
+ csiphy->base_clk_mux = devm_ioremap_resource(dev, r);
+ if (IS_ERR(csiphy->base_clk_mux)) {
+ dev_err(dev, "could not map memory\n");
+ return PTR_ERR(csiphy->base_clk_mux);
+ }
+
+ /* Interrupt */
+
+ r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, res->interrupt[0]);
+ csiphy->irq = r->start;
+ if (IS_ERR_VALUE(csiphy->irq))
+ return csiphy->irq;
+
+ ret = devm_request_irq(dev, csiphy->irq, csiphy_isr,
+ IRQF_TRIGGER_RISING, dev_name(dev), csiphy);
+ if (ret < 0) {
+ dev_err(dev, "request_irq failed\n");
+ return ret;
+ }
+
+ disable_irq(csiphy->irq);
+
+ /* Clocks */
+
+ i = 0;
+ csiphy->nclocks = 0;
+ while (res->clock[i++])
+ csiphy->nclocks++;
+
+ csiphy->clock = devm_kzalloc(dev, csiphy->nclocks *
+ sizeof(*csiphy->clock), GFP_KERNEL);
+ if (!csiphy->clock) {
+ dev_err(dev, "could not allocate memory\n");
+ return -ENOMEM;
+ }
+
+ csiphy->clock_rate = devm_kzalloc(dev, csiphy->nclocks *
+ sizeof(*csiphy->clock_rate), GFP_KERNEL);
+ if (!csiphy->clock_rate) {
+ dev_err(dev, "could not allocate memory\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < csiphy->nclocks; i++) {
+ csiphy->clock[i] = devm_clk_get(dev, res->clock[i]);
+ if (IS_ERR(csiphy->clock[i]))
+ return PTR_ERR(csiphy->clock[i]);
+ csiphy->clock_rate[i] = res->clock_rate[i];
+ }
+
+ dev_err(csiphy->camss->dev, "%s: Exit\n", __func__);
+
+ return 0;
+}
+
+/*
+ * csiphy_link_setup - Setup CSIPHY connections
+ * @entity: Pointer to media entity structure
+ * @local: Pointer to local pad
+ * @remote: Pointer to remote pad
+ * @flags: Link flags
+ *
+ * Rreturn 0 on success
+ */
+static int csiphy_link_setup(struct media_entity *entity,
+ const struct media_pad *local,
+ const struct media_pad *remote, u32 flags)
+{
+ if ((local->flags & MEDIA_PAD_FL_SOURCE) &&
+ (flags & MEDIA_LNK_FL_ENABLED)) {
+ struct v4l2_subdev *sd;
+ struct csiphy_device *csiphy;
+ struct csid_device *csid;
+
+ sd = container_of(entity, struct v4l2_subdev, entity);
+ csiphy = v4l2_get_subdevdata(sd);
+
+ sd = container_of(remote->entity, struct v4l2_subdev, entity);
+ csid = v4l2_get_subdevdata(sd);
+
+ csiphy->cfg.csid_id = csid->id;
+ }
+
+ return 0;
+}
+
+static const struct v4l2_subdev_core_ops csiphy_core_ops = {
+ .s_power = csiphy_set_power,
+};
+
+static const struct v4l2_subdev_video_ops csiphy_video_ops = {
+ .s_stream = csiphy_set_stream,
+};
+
+static const struct v4l2_subdev_pad_ops csiphy_pad_ops = {
+ .get_fmt = csiphy_get_format,
+ .set_fmt = csiphy_set_format,
+};
+
+static const struct v4l2_subdev_ops csiphy_v4l2_ops = {
+ .core = &csiphy_core_ops,
+ .video = &csiphy_video_ops,
+ .pad = &csiphy_pad_ops,
+};
+
+static const struct v4l2_subdev_internal_ops csiphy_v4l2_internal_ops;
+
+static const struct media_entity_operations csiphy_media_ops = {
+ .link_setup = csiphy_link_setup,
+ .link_validate = v4l2_subdev_link_validate,
+};
+
+/*
+ * msm_csiphy_register_entities - Register subdev node for CSIPHY module
+ * @csiphy: CSIPHY device
+ * @v4l2_dev: V4L2 device
+ *
+ * Return 0 on success or a negative error code otherwise
+ */
+int msm_csiphy_register_entities(struct csiphy_device *csiphy,
+ struct v4l2_device *v4l2_dev)
+{
+ struct v4l2_subdev *sd = &csiphy->subdev;
+ struct media_pad *pads = csiphy->pads;
+ int ret;
+
+ v4l2_subdev_init(sd, &csiphy_v4l2_ops);
+ sd->internal_ops = &csiphy_v4l2_internal_ops;
+ sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+ snprintf(sd->name, ARRAY_SIZE(sd->name), "%s%d",
+ MSM_CSIPHY_NAME, csiphy->id);
+ v4l2_set_subdevdata(sd, csiphy);
+
+ pads[MSM_CSIPHY_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
+ pads[MSM_CSIPHY_PAD_SRC].flags = MEDIA_PAD_FL_SOURCE;
+
+ sd->entity.ops = &csiphy_media_ops;
+ ret = media_entity_init(&sd->entity, MSM_CSIPHY_PADS_NUM, pads, 0);
+ if (ret < 0) {
+ pr_err("Fail to init media entity");
+ return ret;
+ }
+
+ ret = v4l2_device_register_subdev(v4l2_dev, sd);
+ if (ret < 0) {
+ pr_err("Fail to register subdev");
+ media_entity_cleanup(&sd->entity);
+ }
+
+ return ret;
+}
+
+/*
+ * msm_csiphy_unregister_entities - Unregister CSIPHY module subdev node
+ * @csiphy: CSIPHY device
+ */
+void msm_csiphy_unregister_entities(struct csiphy_device *csiphy)
+{
+ v4l2_device_unregister_subdev(&csiphy->subdev);
+}
projects / karo-tx-linux.git / blobdiff