[Intel-gfx] [Generic GPIO patch 2/3] drm/i915: GPIO for CHT generic MIPI

[Deepak M]

From: Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu at intel.com>

The GPIO configuration and register offsets are different from
baytrail for cherrytrail. Port the gpio programming accordingly
for cherrytrail in this patch.

Cc: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu at intel.com>
Signed-off-by: Deepak M <m.deepak at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h            | 20 +++++++
 drivers/gpu/drm/i915/intel_dsi_panel_vbt.c | 87 +++++++++++++++++++++++++++++-
 2 files changed, 106 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 606dc71..fc57477 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -615,6 +615,16 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define   IOSF_PORT_NC				0x11
 #define   IOSF_PORT_DPIO			0x12
 #define   IOSF_PORT_GPIO_NC			0x13
+#define   CHV_IOSF_PORT_GPIO_N			0x13
+#define   CHV_IOSF_PORT_GPIO_SE			0x48
+#define   CHV_IOSF_PORT_GPIO_SW			0xB2
+#define   CHV_IOSF_PORT_GPIO_E			0xA8
+#define   CHV_MAX_GPIO_NUM_N			72
+#define   CHV_MAX_GPIO_NUM_SE			99
+#define   CHV_MAX_GPIO_NUM_SW			197
+#define   CHV_MIN_GPIO_NUM_SE			73
+#define   CHV_MIN_GPIO_NUM_SW			100
+#define   CHV_MIN_GPIO_NUM_E			198
 #define   IOSF_PORT_CCK				0x14
 #define   IOSF_PORT_DPIO_2			0x1a
 #define   IOSF_PORT_FLISDSI			0x1b
@@ -630,6 +640,16 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define VLV_GPIO_CFG				0x2000CC00
 #define VLV_GPIO_INPUT_DIS			0x04
 
+#define CHV_PAD_FMLY_BASE			0x4400
+#define CHV_PAD_FMLY_SIZE			0x400
+#define CHV_PAD_CFG_0_1_REG_SIZE		0x8
+#define CHV_PAD_CFG_REG_SIZE			0x4
+#define CHV_VBT_MAX_PINS_PER_FMLY		15
+
+#define CHV_GPIO_CFG_UNLOCK			0x00000000
+#define CHV_GPIO_CFG_HIZ			0x00008100
+#define CHV_GPIO_CFG_TX_STATE_SHIFT		1
+
 /* See configdb bunit SB addr map */
 #define BUNIT_REG_BISOC				0x11
 
diff --git a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
index e02e5e0..7fd1fae 100644
--- a/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_panel_vbt.c
@@ -685,7 +685,68 @@ static const u8 *mipi_exec_delay(struct intel_dsi *intel_dsi, const u8 *data)
 	return data;
 }
 
-static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
+static int chv_program_gpio(struct intel_dsi *intel_dsi,
+		const u8 *data, const u8 **cur_data)
+{
+	struct drm_device *dev = intel_dsi->base.base.dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	u8 gpio, action;
+	u16 family_num;
+	u16 function, pad;
+	u8 block;
+
+	/*
+	 * Skipping the first byte as it is of no
+	 * interest for linux kernel in new VBT version
+	 */
+	if (dev_priv->vbt.dsi.seq_version >= 3)
+		data++;
+
+	gpio = *data++;
+
+	/* pull up/down */
+	action = *data++;
+
+	if (dev_priv->vbt.dsi.seq_version >= 3) {
+		if (gpio <= CHV_MAX_GPIO_NUM_N) {
+			block = CHV_IOSF_PORT_GPIO_N;
+			DRM_DEBUG_DRIVER("GPIO is in the north Block\n");
+		} else if (gpio <= CHV_MAX_GPIO_NUM_SE) {
+			block = CHV_IOSF_PORT_GPIO_SE;
+			gpio = gpio - CHV_MIN_GPIO_NUM_SE;
+			DRM_DEBUG_DRIVER("GPIO is in the south east Block\n");
+		} else if (gpio <= CHV_MAX_GPIO_NUM_SW) {
+			block = CHV_IOSF_PORT_GPIO_SW;
+			gpio = gpio - CHV_MIN_GPIO_NUM_SW;
+			DRM_DEBUG_DRIVER("GPIO is in the south west Block\n");
+		} else {
+			block = CHV_IOSF_PORT_GPIO_E;
+			gpio = gpio - CHV_MIN_GPIO_NUM_E;
+			DRM_DEBUG_DRIVER("GPIO is in the east Block\n");
+		}
+	} else
+		block = IOSF_PORT_GPIO_NC;
+
+	family_num =  gpio / CHV_VBT_MAX_PINS_PER_FMLY;
+	gpio = gpio - (family_num * CHV_VBT_MAX_PINS_PER_FMLY);
+	pad = CHV_PAD_FMLY_BASE + (family_num * CHV_PAD_FMLY_SIZE) +
+		(((u16)gpio) * CHV_PAD_CFG_0_1_REG_SIZE);
+	function = pad + CHV_PAD_CFG_REG_SIZE;
+
+	mutex_lock(&dev_priv->sb_lock);
+	vlv_iosf_sb_write(dev_priv, block, function,
+			CHV_GPIO_CFG_UNLOCK);
+	vlv_iosf_sb_write(dev_priv, block, pad, CHV_GPIO_CFG_HIZ |
+			(action << CHV_GPIO_CFG_TX_STATE_SHIFT));
+	mutex_unlock(&dev_priv->sb_lock);
+
+	*cur_data = data;
+
+	return 0;
+}
+
+static int vlv_program_gpio(struct intel_dsi *intel_dsi,
+			const u8 *data, const u8 **cur_data)
 {
 	u8 gpio, action;
 	u16 function, pad;
@@ -746,6 +807,30 @@ static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
 	mutex_unlock(&dev_priv->sb_lock);
 
 out:
+	*cur_data = data;
+
+	return 0;
+}
+
+static const u8 *mipi_exec_gpio(struct intel_dsi *intel_dsi, const u8 *data)
+{
+	struct drm_device *dev = intel_dsi->base.base.dev;
+	int ret;
+
+	DRM_DEBUG_DRIVER("MIPI: executing gpio element\n");
+
+	ret = -EINVAL;
+
+	if (IS_CHERRYVIEW(dev))
+		ret = chv_program_gpio(intel_dsi, data, &data);
+	else if (IS_VALLEYVIEW(dev))
+		ret = vlv_program_gpio(intel_dsi, data, &data);
+	else
+		DRM_ERROR("GPIO programming missing for this platform.\n");
+
+	if (ret)
+		return NULL;
+
 	return data;
 }
 
-- 
1.9.1