[PATCH v2 1/2] omap3: Provide means for changing CSI2 PHY configuration

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The OMAP 3630 has configuration how the ISP CSI-2 PHY pins are connected to
the actual CSI-2 receivers outside the ISP itself. Allow changing this
configuration from the ISP driver.

Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxx>
---
 arch/arm/mach-omap2/control.c              |   86 ++++++++++++++++++++++++++++
 arch/arm/mach-omap2/control.h              |   15 +++++
 arch/arm/mach-omap2/include/mach/control.h |   13 ++++
 3 files changed, 114 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-omap2/include/mach/control.h

diff --git a/arch/arm/mach-omap2/control.c b/arch/arm/mach-omap2/control.c
index 3223b81..11bb900 100644
--- a/arch/arm/mach-omap2/control.c
+++ b/arch/arm/mach-omap2/control.c
@@ -12,9 +12,12 @@
  */
 #undef DEBUG
 
+#include <linux/export.h>
 #include <linux/kernel.h>
 #include <linux/io.h>
 
+#include <mach/control.h>
+
 #include <plat/hardware.h>
 #include <plat/sdrc.h>
 
@@ -607,4 +610,87 @@ int omap3_ctrl_save_padconf(void)
 	return 0;
 }
 
+static int omap3630_ctrl_csi2_phy_cfg(u32 phy, u32 flags)
+{
+	u32 cam_phy_ctrl =
+		omap_ctrl_readl(OMAP3630_CONTROL_CAMERA_PHY_CTRL);
+	u32 shift, mode;
+
+	switch (phy) {
+	case OMAP3_CTRL_CSI2_PHY1_CCP2B:
+		cam_phy_ctrl &= ~OMAP3630_CONTROL_CAMERA_PHY_CTRL_CSI1_RX_SEL_PHY2;
+		shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY1_SHIFT;
+		break;
+	case OMAP3_CTRL_CSI2_PHY1_CSI2C:
+		shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY1_SHIFT;
+		mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_DPHY;
+		break;
+	case OMAP3_CTRL_CSI2_PHY2_CCP2B:
+		cam_phy_ctrl |= OMAP3630_CONTROL_CAMERA_PHY_CTRL_CSI1_RX_SEL_PHY2;
+		shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY2_SHIFT;
+		break;
+	case OMAP3_CTRL_CSI2_PHY2_CSI2A:
+		shift = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY2_SHIFT;
+		mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_DPHY;
+		break;
+	default:
+		pr_warn("bad phy %d\n", phy);
+		return -EINVAL;
+	}
+
+	/* Select data/clock or data/strobe mode for CCP2 */
+	switch (phy) {
+	case OMAP3_CTRL_CSI2_PHY1_CCP2B:
+	case OMAP3_CTRL_CSI2_PHY2_CCP2B:
+		if (flags & OMAP3_CTRL_CSI2_CFG_CCP2_DATA_STROBE)
+			mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_STROBE;
+		else
+			mode = OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_CLOCK;
+		break;
+	}
+
+	cam_phy_ctrl &= ~(OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_MASK << shift);
+	cam_phy_ctrl |= mode << shift;
+
+	omap_ctrl_writel(cam_phy_ctrl,
+			 OMAP3630_CONTROL_CAMERA_PHY_CTRL);
+
+	return 0;
+}
+
+static int omap3430_ctrl_csi2_phy_cfg(u32 phy, bool on, u32 flags)
+{
+	uint32_t csirxfe = OMAP343X_CONTROL_CSIRXFE_PWRDNZ
+		| OMAP343X_CONTROL_CSIRXFE_RESET;
+
+	/* Nothing to configure here. */
+	if (phy == OMAP3_CTRL_CSI2_PHY2_CSI2A)
+		return 0;
+
+	if (phy != OMAP3_CTRL_CSI2_PHY1_CCP2B)
+		return -EINVAL;
+
+	if (!on) {
+		omap_ctrl_writel(0, OMAP343X_CONTROL_CSIRXFE);
+		return 0;
+	}
+
+	if (flags & OMAP3_CTRL_CSI2_CFG_CCP2_DATA_STROBE)
+		csirxfe |= OMAP343X_CONTROL_CSIRXFE_SELFORM;
+
+	omap_ctrl_writel(csirxfe, OMAP343X_CONTROL_CSIRXFE);
+
+	return 0;
+}
+
+int omap3_ctrl_csi2_phy_cfg(u32 phy, bool on, u32 flags)
+{
+	if (cpu_is_omap3630() && on)
+		return omap3630_ctrl_csi2_phy_cfg(phy, flags);
+	if (cpu_is_omap3430())
+		return omap3430_ctrl_csi2_phy_cfg(phy, on, flags);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(omap3_ctrl_csi2_phy_cfg);
+
 #endif /* CONFIG_ARCH_OMAP3 && CONFIG_PM */
diff --git a/arch/arm/mach-omap2/control.h b/arch/arm/mach-omap2/control.h
index b8cdc85..7b2ee5d 100644
--- a/arch/arm/mach-omap2/control.h
+++ b/arch/arm/mach-omap2/control.h
@@ -132,6 +132,11 @@
 #define OMAP343X_CONTROL_MEM_DFTRW1	(OMAP2_CONTROL_GENERAL + 0x000c)
 #define OMAP343X_CONTROL_DEVCONF1	(OMAP2_CONTROL_GENERAL + 0x0068)
 #define OMAP343X_CONTROL_CSIRXFE		(OMAP2_CONTROL_GENERAL + 0x006c)
+#define OMAP343X_CONTROL_CSIRXFE_CSIB_INV	(1 << 7)
+#define OMAP343X_CONTROL_CSIRXFE_RESENABLE	(1 << 8)
+#define OMAP343X_CONTROL_CSIRXFE_SELFORM	(1 << 10)
+#define OMAP343X_CONTROL_CSIRXFE_PWRDNZ		(1 << 12)
+#define OMAP343X_CONTROL_CSIRXFE_RESET		(1 << 13)
 #define OMAP343X_CONTROL_SEC_STATUS		(OMAP2_CONTROL_GENERAL + 0x0070)
 #define OMAP343X_CONTROL_SEC_ERR_STATUS		(OMAP2_CONTROL_GENERAL + 0x0074)
 #define OMAP343X_CONTROL_SEC_ERR_STATUS_DEBUG	(OMAP2_CONTROL_GENERAL + 0x0078)
@@ -189,6 +194,16 @@
 #define OMAP3630_CONTROL_FUSE_OPP50_VDD2        (OMAP2_CONTROL_GENERAL + 0x0128)
 #define OMAP3630_CONTROL_FUSE_OPP100_VDD2       (OMAP2_CONTROL_GENERAL + 0x012C)
 #define OMAP3630_CONTROL_CAMERA_PHY_CTRL	(OMAP2_CONTROL_GENERAL + 0x02f0)
+#define OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY1_SHIFT	2
+#define OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_PHY2_SHIFT	0
+#define OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_DPHY		0x0
+#define OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_STROBE 0x1
+#define OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_CCP2_DATA_CLOCK 0x2
+#define OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_GPI		0x3
+#define OMAP3630_CONTROL_CAMERA_PHY_CTRL_CAMMODE_MASK		0x3
+/* CCP2B: set to receive data from PHY2 instead of PHY1 */
+#define OMAP3630_CONTROL_CAMERA_PHY_CTRL_CSI1_RX_SEL_PHY2	(1 << 4)
+
 
 /* OMAP44xx control efuse offsets */
 #define OMAP44XX_CONTROL_FUSE_IVA_OPP50		0x22C
diff --git a/arch/arm/mach-omap2/include/mach/control.h b/arch/arm/mach-omap2/include/mach/control.h
new file mode 100644
index 0000000..afd0bed
--- /dev/null
+++ b/arch/arm/mach-omap2/include/mach/control.h
@@ -0,0 +1,13 @@
+#ifndef __MACH_CONTROL_H__
+#define __MACH_CONTROL_H__
+
+#define OMAP3_CTRL_CSI2_PHY2_CSI2A	0
+#define OMAP3_CTRL_CSI2_PHY2_CCP2B	1
+#define OMAP3_CTRL_CSI2_PHY1_CCP2B	2
+#define OMAP3_CTRL_CSI2_PHY1_CSI2C	3
+
+#define OMAP3_CTRL_CSI2_CFG_CCP2_DATA_STROBE	(1 << 0)
+
+int omap3_ctrl_csi2_phy_cfg(u32 phy, bool on, u32 flags);
+
+#endif /* __MACH_CONTROL_H__ */
-- 
1.7.2.5

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