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Subject[PATCH v2 3/3] media: Add support for Cadence CSI2RX 2.1
Date
This patch adds support for CSI2RX v2.1 version of the controller.

Signed-off-by: Jan Kotas <jank@cadence.com>
---
drivers/media/platform/cadence/cdns-csi2rx.c | 139 ++++++++++++++++++++++-----
1 file changed, 116 insertions(+), 23 deletions(-)

diff --git a/drivers/media/platform/cadence/cdns-csi2rx.c b/drivers/media/platform/cadence/cdns-csi2rx.c
index 97ec09e72..aa1d46111 100644
--- a/drivers/media/platform/cadence/cdns-csi2rx.c
+++ b/drivers/media/platform/cadence/cdns-csi2rx.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0+
/*
- * Driver for Cadence MIPI-CSI2 RX Controller v1.3
+ * Driver for Cadence MIPI-CSI2 RX Controller
*
* Copyright (C) 2017-2019 Cadence Design Systems Inc.
*/
@@ -26,6 +26,9 @@
#define CSI2RX_SOFT_RESET_PROTOCOL BIT(1)
#define CSI2RX_SOFT_RESET_FRONT BIT(0)

+#define CSI2RX_V2_CORE_CTRL_REG 0x004
+#define CSI2RX_V2_CORE_CTRL_START BIT(0)
+
#define CSI2RX_STATIC_CFG_REG 0x008
#define CSI2RX_STATIC_CFG_DLANE_MAP(llane, plane) ((plane) << (16 + (llane) * 4))
#define CSI2RX_STATIC_CFG_LANES_MASK GENMASK(11, 8)
@@ -54,6 +57,15 @@ enum csi2rx_pads {
CSI2RX_PAD_MAX,
};

+struct csi2rx_priv;
+
+/* CSI2RX Variant Operations */
+struct csi2rx_vops {
+ void (*get_dev_cfg)(struct csi2rx_priv *csi2rx);
+ void (*reset)(struct csi2rx_priv *csi2rx);
+ void (*map_static)(struct csi2rx_priv *csi2rx);
+};
+
struct csi2rx_priv {
struct device *dev;
unsigned int count;
@@ -69,6 +81,7 @@ struct csi2rx_priv {
struct clk *p_clk;
struct clk *pixel_clk[CSI2RX_STREAMS_MAX];
struct phy *dphy;
+ struct csi2rx_vops *vops;

u8 lanes[CSI2RX_LANES_MAX];
u8 num_lanes;
@@ -92,6 +105,32 @@ struct csi2rx_priv *v4l2_subdev_to_csi2rx(struct v4l2_subdev *subdev)
return container_of(subdev, struct csi2rx_priv, subdev);
}

+static void csi2rx_get_dev_cfg(struct csi2rx_priv *csi2rx)
+{
+ u32 dev_cfg;
+
+ clk_prepare_enable(csi2rx->p_clk);
+ dev_cfg = readl(csi2rx->base + CSI2RX_DEVICE_CFG_REG);
+ clk_disable_unprepare(csi2rx->p_clk);
+
+ csi2rx->max_lanes = dev_cfg & 7;
+ csi2rx->max_streams = (dev_cfg >> 4) & 7;
+ csi2rx->has_internal_dphy = dev_cfg & BIT(3) ? true : false;
+}
+
+static void csi2rx_v2_get_dev_cfg(struct csi2rx_priv *csi2rx)
+{
+ u32 dev_cfg;
+
+ clk_prepare_enable(csi2rx->p_clk);
+ dev_cfg = readl(csi2rx->base + CSI2RX_DEVICE_CFG_REG);
+ clk_disable_unprepare(csi2rx->p_clk);
+
+ csi2rx->max_lanes = dev_cfg & 0xF;
+ csi2rx->max_streams = (dev_cfg >> 5) & 0xF;
+ csi2rx->has_internal_dphy = dev_cfg & BIT(4) ? true : false;
+}
+
static void csi2rx_reset(struct csi2rx_priv *csi2rx)
{
writel(CSI2RX_SOFT_RESET_PROTOCOL | CSI2RX_SOFT_RESET_FRONT,
@@ -102,18 +141,21 @@ static void csi2rx_reset(struct csi2rx_priv *csi2rx)
writel(0, csi2rx->base + CSI2RX_SOFT_RESET_REG);
}

-static int csi2rx_start(struct csi2rx_priv *csi2rx)
+static void csi2rx_v2_reset(struct csi2rx_priv *csi2rx)
+{
+ writel(0, csi2rx->base + CSI2RX_V2_CORE_CTRL_REG);
+
+ udelay(10);
+
+ writel(CSI2RX_V2_CORE_CTRL_START,
+ csi2rx->base + CSI2RX_V2_CORE_CTRL_REG);
+}
+
+static void csi2rx_map_static(struct csi2rx_priv *csi2rx)
{
unsigned int i;
unsigned long lanes_used = 0;
u32 reg;
- int ret;
-
- ret = clk_prepare_enable(csi2rx->p_clk);
- if (ret)
- return ret;
-
- csi2rx_reset(csi2rx);

reg = csi2rx->num_lanes << 8;
for (i = 0; i < csi2rx->num_lanes; i++) {
@@ -135,6 +177,32 @@ static int csi2rx_start(struct csi2rx_priv *csi2rx)
}

writel(reg, csi2rx->base + CSI2RX_STATIC_CFG_REG);
+}
+
+static void csi2rx_v2_map_static(struct csi2rx_priv *csi2rx)
+{
+ u32 reg;
+
+ reg = csi2rx->num_lanes << 4;
+ writel(reg, csi2rx->base + CSI2RX_STATIC_CFG_REG);
+}
+
+static int csi2rx_start(struct csi2rx_priv *csi2rx)
+{
+ unsigned int i;
+ int ret;
+
+ ret = clk_prepare_enable(csi2rx->p_clk);
+ if (ret)
+ return ret;
+
+ if (csi2rx->vops) {
+ if (csi2rx->vops->reset)
+ csi2rx->vops->reset(csi2rx);
+
+ if (csi2rx->vops->map_static)
+ csi2rx->vops->map_static(csi2rx);
+ }

ret = v4l2_subdev_call(csi2rx->source_subdev, video, s_stream, true);
if (ret)
@@ -282,7 +350,6 @@ static int csi2rx_get_resources(struct csi2rx_priv *csi2rx,
{
struct resource *res;
unsigned char i;
- u32 dev_cfg;

res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
csi2rx->base = devm_ioremap_resource(&pdev->dev, res);
@@ -316,26 +383,25 @@ static int csi2rx_get_resources(struct csi2rx_priv *csi2rx,
return -EINVAL;
}

- clk_prepare_enable(csi2rx->p_clk);
- dev_cfg = readl(csi2rx->base + CSI2RX_DEVICE_CFG_REG);
- clk_disable_unprepare(csi2rx->p_clk);
+ if (csi2rx->vops && csi2rx->vops->get_dev_cfg) {
+ csi2rx->vops->get_dev_cfg(csi2rx);
+ } else {
+ dev_err(&pdev->dev, "Couldn't get device configuration\n");
+ return -EINVAL;
+ }

- csi2rx->max_lanes = dev_cfg & 7;
if (csi2rx->max_lanes > CSI2RX_LANES_MAX) {
dev_err(&pdev->dev, "Invalid number of lanes: %u\n",
csi2rx->max_lanes);
return -EINVAL;
}

- csi2rx->max_streams = (dev_cfg >> 4) & 7;
if (csi2rx->max_streams > CSI2RX_STREAMS_MAX) {
dev_err(&pdev->dev, "Invalid number of streams: %u\n",
csi2rx->max_streams);
return -EINVAL;
}

- csi2rx->has_internal_dphy = dev_cfg & BIT(3) ? true : false;
-
/*
* FIXME: Once we'll have internal D-PHY support, the check
* will need to be removed.
@@ -426,9 +492,39 @@ static int csi2rx_parse_dt(struct csi2rx_priv *csi2rx)
return ret;
}

+static const struct csi2rx_vops csi2rx_vops = {
+ .get_dev_cfg = csi2rx_get_dev_cfg,
+ .reset = csi2rx_reset,
+ .map_static = csi2rx_map_static
+};
+
+static const struct csi2rx_vops csi2rx_v2_vops = {
+ .get_dev_cfg = csi2rx_v2_get_dev_cfg,
+ .reset = csi2rx_v2_reset,
+ .map_static = csi2rx_v2_map_static
+};
+
+static const struct of_device_id csi2rx_of_table[] = {
+ {
+ .compatible = "cdns,csi2rx",
+ .data = &csi2rx_vops
+ },
+ {
+ .compatible = "cdns,csi2rx-1.3",
+ .data = &csi2rx_vops
+ },
+ {
+ .compatible = "cdns,csi2rx-2.1",
+ .data = &csi2rx_v2_vops
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, csi2rx_of_table);
+
static int csi2rx_probe(struct platform_device *pdev)
{
struct csi2rx_priv *csi2rx;
+ const struct of_device_id *of_id;
unsigned int i;
int ret;

@@ -439,6 +535,9 @@ static int csi2rx_probe(struct platform_device *pdev)
csi2rx->dev = &pdev->dev;
mutex_init(&csi2rx->lock);

+ of_id = of_match_node(csi2rx_of_table, pdev->dev.of_node);
+ csi2rx->vops = (struct csi2rx_vops *)of_id->data;
+
ret = csi2rx_get_resources(csi2rx, pdev);
if (ret)
goto err_free_priv;
@@ -493,12 +592,6 @@ static int csi2rx_remove(struct platform_device *pdev)
return 0;
}

-static const struct of_device_id csi2rx_of_table[] = {
- { .compatible = "cdns,csi2rx" },
- { },
-};
-MODULE_DEVICE_TABLE(of, csi2rx_of_table);
-
static struct platform_driver csi2rx_driver = {
.probe = csi2rx_probe,
.remove = csi2rx_remove,
--
2.15.0
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