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Subject[PATCH v3 19/35] media: camss: csiphy: Split to hardware dependent and independent parts
Date
This will allow to add support for different hardware.

Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
---
drivers/media/platform/qcom/camss/Makefile | 1 +
.../platform/qcom/camss/camss-csiphy-2ph-1-0.c | 173 +++++++++++++++++++++
drivers/media/platform/qcom/camss/camss-csiphy.c | 171 +++-----------------
drivers/media/platform/qcom/camss/camss-csiphy.h | 15 ++
4 files changed, 213 insertions(+), 147 deletions(-)
create mode 100644 drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c

diff --git a/drivers/media/platform/qcom/camss/Makefile b/drivers/media/platform/qcom/camss/Makefile
index 3c4024f..0446b24 100644
--- a/drivers/media/platform/qcom/camss/Makefile
+++ b/drivers/media/platform/qcom/camss/Makefile
@@ -3,6 +3,7 @@
qcom-camss-objs += \
camss.o \
camss-csid.o \
+ camss-csiphy-2ph-1-0.o \
camss-csiphy.o \
camss-ispif.o \
camss-vfe.o \
diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c
new file mode 100644
index 0000000..7325906
--- /dev/null
+++ b/drivers/media/platform/qcom/camss/camss-csiphy-2ph-1-0.c
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * camss-csiphy-2ph-1-0.c
+ *
+ * Qualcomm MSM Camera Subsystem - CSIPHY Module 2phase v1.0
+ *
+ * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2016-2018 Linaro Ltd.
+ */
+
+#include "camss-csiphy.h"
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+
+#define CAMSS_CSI_PHY_LNn_CFG2(n) (0x004 + 0x40 * (n))
+#define CAMSS_CSI_PHY_LNn_CFG3(n) (0x008 + 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
+
+static void csiphy_hw_version_read(struct csiphy_device *csiphy,
+ struct device *dev)
+{
+ u8 hw_version = readl_relaxed(csiphy->base +
+ CAMSS_CSI_PHY_HW_VERSION);
+
+ dev_dbg(dev, "CSIPHY HW Version = 0x%02x\n", hw_version);
+}
+
+/*
+ * 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_settle_cnt_calc - Calculate settle count value
+ *
+ * Helper function to calculate settle count value. This is
+ * based on the CSI2 T_hs_settle parameter which in turn
+ * is calculated based on the CSI2 transmitter pixel clock
+ * frequency.
+ *
+ * Return settle count value or 0 if the CSI2 pixel clock
+ * frequency is not available
+ */
+static u8 csiphy_settle_cnt_calc(u32 pixel_clock, u8 bpp, u8 num_lanes,
+ u32 timer_clk_rate)
+{
+ u32 mipi_clock; /* Hz */
+ u32 ui; /* ps */
+ u32 timer_period; /* ps */
+ u32 t_hs_prepare_max; /* ps */
+ u32 t_hs_prepare_zero_min; /* ps */
+ u32 t_hs_settle; /* ps */
+ u8 settle_cnt;
+
+ mipi_clock = pixel_clock * bpp / (2 * num_lanes);
+ ui = div_u64(1000000000000LL, mipi_clock);
+ ui /= 2;
+ t_hs_prepare_max = 85000 + 6 * ui;
+ t_hs_prepare_zero_min = 145000 + 10 * ui;
+ t_hs_settle = (t_hs_prepare_max + t_hs_prepare_zero_min) / 2;
+
+ timer_period = div_u64(1000000000000LL, timer_clk_rate);
+ settle_cnt = t_hs_settle / timer_period - 1;
+
+ return settle_cnt;
+}
+
+static void csiphy_lanes_enable(struct csiphy_device *csiphy,
+ struct csiphy_config *cfg,
+ u32 pixel_clock, u8 bpp, u8 lane_mask)
+{
+ struct csiphy_lanes_cfg *c = &cfg->csi2->lane_cfg;
+ u8 settle_cnt;
+ u8 val;
+ int i = 0;
+
+ settle_cnt = csiphy_settle_cnt_calc(pixel_clock, bpp, c->num_data,
+ csiphy->timer_clk_rate);
+
+ 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);
+
+ while (lane_mask) {
+ if (lane_mask & 0x1) {
+ writel_relaxed(0x10, csiphy->base +
+ CAMSS_CSI_PHY_LNn_CFG2(i));
+ writel_relaxed(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));
+ }
+
+ lane_mask >>= 1;
+ i++;
+ }
+}
+
+static void csiphy_lanes_disable(struct csiphy_device *csiphy, u8 lane_mask)
+{
+ int i = 0;
+
+ while (lane_mask) {
+ if (lane_mask & 0x1)
+ writel_relaxed(0x0, csiphy->base +
+ CAMSS_CSI_PHY_LNn_CFG2(i));
+
+ lane_mask >>= 1;
+ i++;
+ }
+
+ writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_PWR_CFG);
+}
+
+/*
+ * 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 i;
+
+ for (i = 0; i < 8; i++) {
+ u8 val = readl_relaxed(csiphy->base +
+ CAMSS_CSI_PHY_INTERRUPT_STATUSn(i));
+ writel_relaxed(val, 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;
+}
+
+const struct csiphy_hw_ops csiphy_ops_2ph_1_0 = {
+ .hw_version_read = csiphy_hw_version_read,
+ .reset = csiphy_reset,
+ .lanes_enable = csiphy_lanes_enable,
+ .lanes_disable = csiphy_lanes_disable,
+ .isr = csiphy_isr,
+};
+
diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.c b/drivers/media/platform/qcom/camss/camss-csiphy.c
index 2db78791..14a9a66 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy.c
+++ b/drivers/media/platform/qcom/camss/camss-csiphy.c
@@ -23,17 +23,7 @@

#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_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
+extern struct csiphy_hw_ops csiphy_ops_2ph_1_0;

static const struct {
u32 code;
@@ -125,32 +115,6 @@ static u8 csiphy_get_bpp(u32 code)
}

/*
- * 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 i;
-
- for (i = 0; i < 8; i++) {
- u8 val = readl_relaxed(csiphy->base +
- CAMSS_CSI_PHY_INTERRUPT_STATUSn(i));
- writel_relaxed(val, 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_set_clock_rates - Calculate and set clock rates on CSIPHY module
* @csiphy: CSIPHY device
*/
@@ -215,17 +179,6 @@ static int csiphy_set_clock_rates(struct csiphy_device *csiphy)
}

/*
- * 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_set_power - Power on/off CSIPHY module
* @sd: CSIPHY V4L2 subdevice
* @on: Requested power state
@@ -238,7 +191,6 @@ static int csiphy_set_power(struct v4l2_subdev *sd, int on)
struct device *dev = csiphy->camss->dev;

if (on) {
- u8 hw_version;
int ret;

pm_runtime_get_sync(dev);
@@ -253,11 +205,9 @@ static int csiphy_set_power(struct v4l2_subdev *sd, int on)

enable_irq(csiphy->irq);

- csiphy_reset(csiphy);
+ csiphy->ops->reset(csiphy);

- hw_version = readl_relaxed(csiphy->base +
- CAMSS_CSI_PHY_HW_VERSION);
- dev_dbg(dev, "CSIPHY HW Version = 0x%02x\n", hw_version);
+ csiphy->ops->hw_version_read(csiphy, dev);
} else {
disable_irq(csiphy->irq);

@@ -289,77 +239,34 @@ static u8 csiphy_get_lane_mask(struct csiphy_lanes_cfg *lane_cfg)
}

/*
- * csiphy_settle_cnt_calc - Calculate settle count value
+ * csiphy_stream_on - Enable streaming on CSIPHY module
* @csiphy: CSIPHY device
*
- * Helper function to calculate settle count value. This is
- * based on the CSI2 T_hs_settle parameter which in turn
- * is calculated based on the CSI2 transmitter pixel clock
- * frequency.
+ * Helper function to enable streaming on CSIPHY module.
+ * Main configuration of CSIPHY module is also done here.
*
- * Return settle count value or 0 if the CSI2 pixel clock
- * frequency is not available
+ * Return 0 on success or a negative error code otherwise
*/
-static u8 csiphy_settle_cnt_calc(struct csiphy_device *csiphy)
+static int csiphy_stream_on(struct csiphy_device *csiphy)
{
- u8 bpp = csiphy_get_bpp(
- csiphy->fmt[MSM_CSIPHY_PAD_SINK].code);
- u8 num_lanes = csiphy->cfg.csi2->lane_cfg.num_data;
- u32 pixel_clock; /* Hz */
- u32 mipi_clock; /* Hz */
- u32 ui; /* ps */
- u32 timer_period; /* ps */
- u32 t_hs_prepare_max; /* ps */
- u32 t_hs_prepare_zero_min; /* ps */
- u32 t_hs_settle; /* ps */
- u8 settle_cnt;
+ struct csiphy_config *cfg = &csiphy->cfg;
+ u32 pixel_clock;
+ u8 lane_mask = csiphy_get_lane_mask(&cfg->csi2->lane_cfg);
+ u8 bpp = csiphy_get_bpp(csiphy->fmt[MSM_CSIPHY_PAD_SINK].code);
+ u8 val;
int ret;

ret = camss_get_pixel_clock(&csiphy->subdev.entity, &pixel_clock);
if (ret) {
dev_err(csiphy->camss->dev,
"Cannot get CSI2 transmitter's pixel clock\n");
- return 0;
+ return -EINVAL;
}
if (!pixel_clock) {
dev_err(csiphy->camss->dev,
"Got pixel clock == 0, cannot continue\n");
- return 0;
- }
-
- mipi_clock = pixel_clock * bpp / (2 * num_lanes);
- ui = div_u64(1000000000000LL, mipi_clock);
- ui /= 2;
- t_hs_prepare_max = 85000 + 6 * ui;
- t_hs_prepare_zero_min = 145000 + 10 * ui;
- t_hs_settle = (t_hs_prepare_max + t_hs_prepare_zero_min) / 2;
-
- timer_period = div_u64(1000000000000LL, csiphy->timer_clk_rate);
- settle_cnt = t_hs_settle / timer_period - 1;
-
- return settle_cnt;
-}
-
-/*
- * csiphy_stream_on - Enable streaming on CSIPHY module
- * @csiphy: CSIPHY device
- *
- * Helper function to enable streaming on CSIPHY module.
- * Main configuration of CSIPHY module is also done here.
- *
- * Return 0 on success or a negative error code otherwise
- */
-static int csiphy_stream_on(struct csiphy_device *csiphy)
-{
- struct csiphy_config *cfg = &csiphy->cfg;
- u8 lane_mask = csiphy_get_lane_mask(&cfg->csi2->lane_cfg);
- u8 settle_cnt;
- u8 val;
- int i = 0;
-
- settle_cnt = csiphy_settle_cnt_calc(csiphy);
- if (!settle_cnt)
return -EINVAL;
+ }

val = readl_relaxed(csiphy->base_clk_mux);
if (cfg->combo_mode && (lane_mask & 0x18) == 0x18) {
@@ -372,33 +279,7 @@ static int csiphy_stream_on(struct csiphy_device *csiphy)
writel_relaxed(val, csiphy->base_clk_mux);
wmb();

- 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);
-
- while (lane_mask) {
- if (lane_mask & 0x1) {
- writel_relaxed(0x10, csiphy->base +
- CAMSS_CSI_PHY_LNn_CFG2(i));
- writel_relaxed(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));
- }
-
- lane_mask >>= 1;
- i++;
- }
+ csiphy->ops->lanes_enable(csiphy, cfg, pixel_clock, bpp, lane_mask);

return 0;
}
@@ -412,18 +293,8 @@ static int csiphy_stream_on(struct csiphy_device *csiphy)
static void csiphy_stream_off(struct csiphy_device *csiphy)
{
u8 lane_mask = csiphy_get_lane_mask(&csiphy->cfg.csi2->lane_cfg);
- int i = 0;

- while (lane_mask) {
- if (lane_mask & 0x1)
- writel_relaxed(0x0, csiphy->base +
- CAMSS_CSI_PHY_LNn_CFG2(i));
-
- lane_mask >>= 1;
- i++;
- }
-
- writel_relaxed(0x0, csiphy->base + CAMSS_CSI_PHY_GLBL_PWR_CFG);
+ csiphy->ops->lanes_disable(csiphy, lane_mask);
}


@@ -690,6 +561,11 @@ int msm_csiphy_subdev_init(struct camss *camss,
csiphy->id = id;
csiphy->cfg.combo_mode = 0;

+ if (camss->version == CAMSS_8x16)
+ csiphy->ops = &csiphy_ops_2ph_1_0;
+ else
+ return -EINVAL;
+
/* Memory */

r = platform_get_resource_byname(pdev, IORESOURCE_MEM, res->reg[0]);
@@ -718,7 +594,8 @@ int msm_csiphy_subdev_init(struct camss *camss,
csiphy->irq = r->start;
snprintf(csiphy->irq_name, sizeof(csiphy->irq_name), "%s_%s%d",
dev_name(dev), MSM_CSIPHY_NAME, csiphy->id);
- ret = devm_request_irq(dev, csiphy->irq, csiphy_isr,
+
+ ret = devm_request_irq(dev, csiphy->irq, csiphy->ops->isr,
IRQF_TRIGGER_RISING, csiphy->irq_name, csiphy);
if (ret < 0) {
dev_err(dev, "request_irq failed: %d\n", ret);
diff --git a/drivers/media/platform/qcom/camss/camss-csiphy.h b/drivers/media/platform/qcom/camss/camss-csiphy.h
index 728dfef..8f61b7d 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy.h
+++ b/drivers/media/platform/qcom/camss/camss-csiphy.h
@@ -11,6 +11,7 @@
#define QC_MSM_CAMSS_CSIPHY_H

#include <linux/clk.h>
+#include <linux/interrupt.h>
#include <media/media-entity.h>
#include <media/v4l2-device.h>
#include <media/v4l2-mediabus.h>
@@ -41,6 +42,19 @@ struct csiphy_config {
struct csiphy_csi2_cfg *csi2;
};

+struct csiphy_device;
+
+struct csiphy_hw_ops {
+ void (*hw_version_read)(struct csiphy_device *csiphy,
+ struct device *dev);
+ void (*reset)(struct csiphy_device *csiphy);
+ void (*lanes_enable)(struct csiphy_device *csiphy,
+ struct csiphy_config *cfg,
+ u32 pixel_clock, u8 bpp, u8 lane_mask);
+ void (*lanes_disable)(struct csiphy_device *csiphy, u8 lane_mask);
+ irqreturn_t (*isr)(int irq, void *dev);
+};
+
struct csiphy_device {
struct camss *camss;
u8 id;
@@ -55,6 +69,7 @@ struct csiphy_device {
u32 timer_clk_rate;
struct csiphy_config cfg;
struct v4l2_mbus_framefmt fmt[MSM_CSIPHY_PADS_NUM];
+ struct csiphy_hw_ops *ops;
};

struct resources;
--
2.7.4
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