Expose the two ISP external clocks XCLKA and XCLKB as common clocks for
subdev drivers.
Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
drivers/media/platform/omap3isp/isp.c | 270 ++++++++++++++++++++++++----------
drivers/media/platform/omap3isp/isp.h | 22 ++-
include/media/omap3isp.h | 10 +-
3 files changed, 218 insertions(+), 84 deletions(-)
diff --git a/drivers/media/platform/omap3isp/isp.c b/drivers/media/platform/omap3isp/isp.c
index 6e5ad8e..694470d 100644
--- a/drivers/media/platform/omap3isp/isp.c
+++ b/drivers/media/platform/omap3isp/isp.c
@@ -55,6 +55,7 @@
#include <asm/cacheflush.h>
#include <linux/clk.h>
+#include <linux/clkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
@@ -148,6 +149,194 @@ void omap3isp_flush(struct isp_device *isp)
isp_reg_readl(isp, OMAP3_ISP_IOMEM_MAIN, ISP_REVISION);
}
+/* -----------------------------------------------------------------------------
+ * XCLK
+ */
+
+#define to_isp_xclk(_hw) container_of(_hw, struct isp_xclk, hw)
+
+static void isp_xclk_update(struct isp_xclk *xclk, u32 divider)
+{
+ switch (xclk->id) {
+ case ISP_XCLK_A:
+ isp_reg_clr_set(xclk->isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
+ ISPTCTRL_CTRL_DIVA_MASK,
+ divider << ISPTCTRL_CTRL_DIVA_SHIFT);
+ break;
+ case ISP_XCLK_B:
+ isp_reg_clr_set(xclk->isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
+ ISPTCTRL_CTRL_DIVB_MASK,
+ divider << ISPTCTRL_CTRL_DIVB_SHIFT);
+ break;
+ }
+}
+
+static int isp_xclk_prepare(struct clk_hw *hw)
+{
+ struct isp_xclk *xclk = to_isp_xclk(hw);
+
+ omap3isp_get(xclk->isp);
+
+ return 0;
+}
+
+static void isp_xclk_unprepare(struct clk_hw *hw)
+{
+ struct isp_xclk *xclk = to_isp_xclk(hw);
+
+ omap3isp_put(xclk->isp);
+}
+
+static int isp_xclk_enable(struct clk_hw *hw)
+{
+ struct isp_xclk *xclk = to_isp_xclk(hw);
+ unsigned long flags;
+
+ spin_lock_irqsave(&xclk->lock, flags);
+ isp_xclk_update(xclk, xclk->divider);
+ xclk->enabled = true;
+ spin_unlock_irqrestore(&xclk->lock, flags);
+
+ return 0;
+}
+
+static void isp_xclk_disable(struct clk_hw *hw)
+{
+ struct isp_xclk *xclk = to_isp_xclk(hw);
+ unsigned long flags;
+
+ spin_lock_irqsave(&xclk->lock, flags);
+ isp_xclk_update(xclk, 0);
+ xclk->enabled = false;
+ spin_unlock_irqrestore(&xclk->lock, flags);
+}
+
+static unsigned long isp_xclk_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct isp_xclk *xclk = to_isp_xclk(hw);
+
+ return parent_rate / xclk->divider;
+}
+
+static u32 isp_xclk_calc_divider(unsigned long *rate, unsigned long parent_rate)
+{
+ u32 divider;
+
+ if (*rate >= parent_rate) {
+ *rate = parent_rate;
+ return ISPTCTRL_CTRL_DIV_BYPASS;
+ }
+
+ divider = DIV_ROUND_CLOSEST(parent_rate, *rate);
+ if (divider >= ISPTCTRL_CTRL_DIV_BYPASS)
+ divider = ISPTCTRL_CTRL_DIV_BYPASS - 1;
+
+ *rate = parent_rate / divider;
+ return divider;
+}
+
+static long isp_xclk_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ isp_xclk_calc_divider(&rate, *parent_rate);
+ return rate;
+}
+
+static int isp_xclk_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct isp_xclk *xclk = to_isp_xclk(hw);
+ unsigned long flags;
+ u32 divider;
+
+ divider = isp_xclk_calc_divider(&rate, parent_rate);
+
+ spin_lock_irqsave(&xclk->lock, flags);
+
+ xclk->divider = divider;
+ if (xclk->enabled)
+ isp_xclk_update(xclk, divider);
+
+ spin_unlock_irqrestore(&xclk->lock, flags);
+
+ dev_dbg(xclk->isp->dev, "%s: cam_xclk%c set to %lu Hz (div %u)\n",
+ __func__, xclk->id == ISP_XCLK_A ? 'a' : 'b', rate, divider);
+ return 0;
+}
+
+static const struct clk_ops isp_xclk_ops = {
+ .prepare = isp_xclk_prepare,
+ .unprepare = isp_xclk_unprepare,
+ .enable = isp_xclk_enable,
+ .disable = isp_xclk_disable,
+ .recalc_rate = isp_xclk_recalc_rate,
+ .round_rate = isp_xclk_round_rate,
+ .set_rate = isp_xclk_set_rate,
+};
+
+static const char *isp_xclk_parent_name = "cam_mclk";
+
+static int isp_xclk_init(struct isp_device *isp)
+{
+ struct isp_platform_data *pdata = isp->pdata;
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(isp->xclks); ++i) {
+ struct isp_xclk *xclk = &isp->xclks[i];
+ struct clk_init_data init;
+ struct clk *clk;
+
+ xclk->isp = isp;
+ xclk->id = i == 0 ? ISP_XCLK_A : ISP_XCLK_B;
+ xclk->divider = 1;
+ spin_lock_init(&xclk->lock);
+
+ init.name = i == 0 ? "cam_xclka" : "cam_xclkb";
+ init.ops = &isp_xclk_ops;
+ init.parent_names = &isp_xclk_parent_name;
+ init.num_parents = 1;
+
+ xclk->hw.init = &init;
+
+ clk = devm_clk_register(isp->dev, &xclk->hw);
+ if (IS_ERR(clk))
+ return PTR_ERR(clk);
+
+ if (pdata->xclks[i].con_id == NULL &&
+ pdata->xclks[i].dev_id == NULL)
+ continue;
+
+ xclk->lookup = kzalloc(sizeof(*xclk->lookup), GFP_KERNEL);
+ if (xclk->lookup == NULL)
+ return -ENOMEM;
+
+ xclk->lookup->con_id = pdata->xclks[i].con_id;
+ xclk->lookup->dev_id = pdata->xclks[i].dev_id;
+ xclk->lookup->clk = clk;
+
+ clkdev_add(xclk->lookup);
+ }
+
+ return 0;
+}
+
+static void isp_xclk_cleanup(struct isp_device *isp)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(isp->xclks); ++i) {
+ struct isp_xclk *xclk = &isp->xclks[i];
+
+ if (xclk->lookup)
+ clkdev_drop(xclk->lookup);
+ }
+}
+
+/* -----------------------------------------------------------------------------
+ * Interrupts
+ */
+
/*
* isp_enable_interrupts - Enable ISP interrupts.
* @isp: OMAP3 ISP device
@@ -180,80 +369,6 @@ static void isp_disable_interrupts(struct isp_device *isp)
isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_MAIN, ISP_IRQ0ENABLE);
}
-/**
- * isp_set_xclk - Configures the specified cam_xclk to the desired frequency.
- * @isp: OMAP3 ISP device
- * @xclk: Desired frequency of the clock in Hz. 0 = stable low, 1 is stable high
- * @xclksel: XCLK to configure (0 = A, 1 = B).
- *
- * Configures the specified MCLK divisor in the ISP timing control register
- * (TCTRL_CTRL) to generate the desired xclk clock value.
- *
- * Divisor = cam_mclk_hz / xclk
- *
- * Returns the final frequency that is actually being generated
- **/
-static u32 isp_set_xclk(struct isp_device *isp, u32 xclk, u8 xclksel)
-{
- u32 divisor;
- u32 currentxclk;
- unsigned long mclk_hz;
-
- if (!omap3isp_get(isp))
- return 0;
-
- mclk_hz = clk_get_rate(isp->clock[ISP_CLK_CAM_MCLK]);
-
- if (xclk >= mclk_hz) {
- divisor = ISPTCTRL_CTRL_DIV_BYPASS;
- currentxclk = mclk_hz;
- } else if (xclk >= 2) {
- divisor = mclk_hz / xclk;
- if (divisor >= ISPTCTRL_CTRL_DIV_BYPASS)
- divisor = ISPTCTRL_CTRL_DIV_BYPASS - 1;
- currentxclk = mclk_hz / divisor;
- } else {
- divisor = xclk;
- currentxclk = 0;
- }
-
- switch (xclksel) {
- case ISP_XCLK_A:
- isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
- ISPTCTRL_CTRL_DIVA_MASK,
- divisor << ISPTCTRL_CTRL_DIVA_SHIFT);
- dev_dbg(isp->dev, "isp_set_xclk(): cam_xclka set to %d Hz\n",
- currentxclk);
- break;
- case ISP_XCLK_B:
- isp_reg_clr_set(isp, OMAP3_ISP_IOMEM_MAIN, ISP_TCTRL_CTRL,
- ISPTCTRL_CTRL_DIVB_MASK,
- divisor << ISPTCTRL_CTRL_DIVB_SHIFT);
- dev_dbg(isp->dev, "isp_set_xclk(): cam_xclkb set to %d Hz\n",
- currentxclk);
- break;
- case ISP_XCLK_NONE:
- default:
- omap3isp_put(isp);
- dev_dbg(isp->dev, "ISP_ERR: isp_set_xclk(): Invalid requested "
- "xclk. Must be 0 (A) or 1 (B).\n");
- return -EINVAL;
- }
-
- /* Do we go from stable whatever to clock? */
- if (divisor >= 2 && isp->xclk_divisor[xclksel - 1] < 2)
- omap3isp_get(isp);
- /* Stopping the clock. */
- else if (divisor < 2 && isp->xclk_divisor[xclksel - 1] >= 2)
- omap3isp_put(isp);
-
- isp->xclk_divisor[xclksel - 1] = divisor;
-
- omap3isp_put(isp);
-
- return currentxclk;
-}
-
/*
* isp_core_init - ISP core settings
* @isp: OMAP3 ISP device
@@ -1969,6 +2084,7 @@ static int isp_remove(struct platform_device *pdev)
isp_unregister_entities(isp);
isp_cleanup_modules(isp);
+ isp_xclk_cleanup(isp);
__omap3isp_get(isp, false);
iommu_detach_device(isp->domain, &pdev->dev);
@@ -2042,7 +2158,6 @@ static int isp_probe(struct platform_device *pdev)
}
isp->autoidle = autoidle;
- isp->platform_cb.set_xclk = isp_set_xclk;
mutex_init(&isp->isp_mutex);
spin_lock_init(&isp->stat_lock);
@@ -2093,6 +2208,10 @@ static int isp_probe(struct platform_device *pdev)
if (ret < 0)
goto error_isp;
+ ret = isp_xclk_init(isp);
+ if (ret < 0)
+ goto error_isp;
+
/* Memory resources */
for (m = 0; m < ARRAY_SIZE(isp_res_maps); m++)
if (isp->revision == isp_res_maps[m].isp_rev)
@@ -2162,6 +2281,7 @@ detach_dev:
free_domain:
iommu_domain_free(isp->domain);
error_isp:
+ isp_xclk_cleanup(isp);
omap3isp_put(isp);
error:
platform_set_drvdata(pdev, NULL);
diff --git a/drivers/media/platform/omap3isp/isp.h b/drivers/media/platform/omap3isp/isp.h
index c77e1f2..cd3eff4 100644
--- a/drivers/media/platform/omap3isp/isp.h
+++ b/drivers/media/platform/omap3isp/isp.h
@@ -29,6 +29,7 @@
#include <media/omap3isp.h>
#include <media/v4l2-device.h>
+#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/iommu.h>
@@ -125,8 +126,20 @@ struct isp_reg {
u32 val;
};
-struct isp_platform_callback {
- u32 (*set_xclk)(struct isp_device *isp, u32 xclk, u8 xclksel);
+enum isp_xclk_id {
+ ISP_XCLK_A,
+ ISP_XCLK_B,
+};
+
+struct isp_xclk {
+ struct isp_device *isp;
+ struct clk_hw hw;
+ struct clk_lookup *lookup;
+ enum isp_xclk_id id;
+
+ spinlock_t lock; /* Protects enabled and divider */
+ bool enabled;
+ unsigned int divider;
};
/*
@@ -149,6 +162,7 @@ struct isp_platform_callback {
* @cam_mclk: Pointer to camera functional clock structure.
* @csi2_fck: Pointer to camera CSI2 complexIO clock structure.
* @l3_ick: Pointer to OMAP3 L3 bus interface clock.
+ * @xclks: External clocks provided by the ISP
* @irq: Currently attached ISP ISR callbacks information structure.
* @isp_af: Pointer to current settings for ISP AutoFocus SCM.
* @isp_hist: Pointer to current settings for ISP Histogram SCM.
@@ -185,12 +199,12 @@ struct isp_device {
int has_context;
int ref_count;
unsigned int autoidle;
- u32 xclk_divisor[2]; /* Two clocks, a and b. */
#define ISP_CLK_CAM_ICK 0
#define ISP_CLK_CAM_MCLK 1
#define ISP_CLK_CSI2_FCK 2
#define ISP_CLK_L3_ICK 3
struct clk *clock[4];
+ struct isp_xclk xclks[2];
/* ISP modules */
struct ispstat isp_af;
@@ -209,8 +223,6 @@ struct isp_device {
unsigned int subclk_resources;
struct iommu_domain *domain;
-
- struct isp_platform_callback platform_cb;
};
#define v4l2_dev_to_isp_device(dev) \
diff --git a/include/media/omap3isp.h b/include/media/omap3isp.h
index 9584269..c9d06d9 100644
--- a/include/media/omap3isp.h
+++ b/include/media/omap3isp.h
@@ -29,10 +29,6 @@
struct i2c_board_info;
struct isp_device;
-#define ISP_XCLK_NONE 0
-#define ISP_XCLK_A 1
-#define ISP_XCLK_B 2
-
enum isp_interface_type {
ISP_INTERFACE_PARALLEL,
ISP_INTERFACE_CSI2A_PHY2,
@@ -153,7 +149,13 @@ struct isp_v4l2_subdevs_group {
} bus; /* gcc < 4.6.0 chokes on anonymous union initializers */
};
+struct isp_platform_xclk {
+ const char *dev_id;
+ const char *con_id;
+};
+
struct isp_platform_data {
+ struct isp_platform_xclk xclks[2];
struct isp_v4l2_subdevs_group *subdevs;
void (*set_constraints)(struct isp_device *isp, bool enable);
};
--
1.8.1.5
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
