1 files changed, 311 insertions, 0 deletions
diff --git a/drivers/media/platform/ti-vpe/sc.c b/drivers/media/platform/ti-vpe/sc.c
new file mode 100644
index 000000000..e9273b713
--- /dev/null
+++ b/drivers/media/platform/ti-vpe/sc.c
@@ -0,0 +1,311 @@
+/*
+ * Scaler library
+ *
+ * Copyright (c) 2013 Texas Instruments Inc.
+ *
+ * David Griego, <dagriego@biglakesoftware.com>
+ * Dale Farnsworth, <dale@farnsworth.org>
+ * Archit Taneja, <archit@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include "sc.h"
+#include "sc_coeff.h"
+
+void sc_dump_regs(struct sc_data *sc)
+{
+	struct device *dev = &sc->pdev->dev;
+
+#define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, \
+	ioread32(sc->base + CFG_##r))
+
+	dev_dbg(dev, "SC Registers @ %pa:\n", &sc->res->start);
+
+	DUMPREG(SC0);
+	DUMPREG(SC1);
+	DUMPREG(SC2);
+	DUMPREG(SC3);
+	DUMPREG(SC4);
+	DUMPREG(SC5);
+	DUMPREG(SC6);
+	DUMPREG(SC8);
+	DUMPREG(SC9);
+	DUMPREG(SC10);
+	DUMPREG(SC11);
+	DUMPREG(SC12);
+	DUMPREG(SC13);
+	DUMPREG(SC17);
+	DUMPREG(SC18);
+	DUMPREG(SC19);
+	DUMPREG(SC20);
+	DUMPREG(SC21);
+	DUMPREG(SC22);
+	DUMPREG(SC23);
+	DUMPREG(SC24);
+	DUMPREG(SC25);
+
+#undef DUMPREG
+}
+EXPORT_SYMBOL(sc_dump_regs);
+
+/*
+ * set the horizontal scaler coefficients according to the ratio of output to
+ * input widths, after accounting for up to two levels of decimation
+ */
+void sc_set_hs_coeffs(struct sc_data *sc, void *addr, unsigned int src_w,
+		unsigned int dst_w)
+{
+	int sixteenths;
+	int idx;
+	int i, j;
+	u16 *coeff_h = addr;
+	const u16 *cp;
+
+	if (dst_w > src_w) {
+		idx = HS_UP_SCALE;
+	} else {
+		if ((dst_w << 1) < src_w)
+			dst_w <<= 1;	/* first level decimation */
+		if ((dst_w << 1) < src_w)
+			dst_w <<= 1;	/* second level decimation */
+
+		if (dst_w == src_w) {
+			idx = HS_LE_16_16_SCALE;
+		} else {
+			sixteenths = (dst_w << 4) / src_w;
+			if (sixteenths < 8)
+				sixteenths = 8;
+			idx = HS_LT_9_16_SCALE + sixteenths - 8;
+		}
+	}
+
+	cp = scaler_hs_coeffs[idx];
+
+	for (i = 0; i < SC_NUM_PHASES * 2; i++) {
+		for (j = 0; j < SC_H_NUM_TAPS; j++)
+			*coeff_h++ = *cp++;
+		/*
+		 * for each phase, the scaler expects space for 8 coefficients
+		 * in it's memory. For the horizontal scaler, we copy the first
+		 * 7 coefficients and skip the last slot to move to the next
+		 * row to hold coefficients for the next phase
+		 */
+		coeff_h += SC_NUM_TAPS_MEM_ALIGN - SC_H_NUM_TAPS;
+	}
+
+	sc->load_coeff_h = true;
+}
+EXPORT_SYMBOL(sc_set_hs_coeffs);
+
+/*
+ * set the vertical scaler coefficients according to the ratio of output to
+ * input heights
+ */
+void sc_set_vs_coeffs(struct sc_data *sc, void *addr, unsigned int src_h,
+		unsigned int dst_h)
+{
+	int sixteenths;
+	int idx;
+	int i, j;
+	u16 *coeff_v = addr;
+	const u16 *cp;
+
+	if (dst_h > src_h) {
+		idx = VS_UP_SCALE;
+	} else if (dst_h == src_h) {
+		idx = VS_1_TO_1_SCALE;
+	} else {
+		sixteenths = (dst_h << 4) / src_h;
+		if (sixteenths < 8)
+			sixteenths = 8;
+		idx = VS_LT_9_16_SCALE + sixteenths - 8;
+	}
+
+	cp = scaler_vs_coeffs[idx];
+
+	for (i = 0; i < SC_NUM_PHASES * 2; i++) {
+		for (j = 0; j < SC_V_NUM_TAPS; j++)
+			*coeff_v++ = *cp++;
+		/*
+		 * for the vertical scaler, we copy the first 5 coefficients and
+		 * skip the last 3 slots to move to the next row to hold
+		 * coefficients for the next phase
+		 */
+		coeff_v += SC_NUM_TAPS_MEM_ALIGN - SC_V_NUM_TAPS;
+	}
+
+	sc->load_coeff_v = true;
+}
+EXPORT_SYMBOL(sc_set_vs_coeffs);
+
+void sc_config_scaler(struct sc_data *sc, u32 *sc_reg0, u32 *sc_reg8,
+		u32 *sc_reg17, unsigned int src_w, unsigned int src_h,
+		unsigned int dst_w, unsigned int dst_h)
+{
+	struct device *dev = &sc->pdev->dev;
+	u32 val;
+	int dcm_x, dcm_shift;
+	bool use_rav;
+	unsigned long lltmp;
+	u32 lin_acc_inc, lin_acc_inc_u;
+	u32 col_acc_offset;
+	u16 factor = 0;
+	int row_acc_init_rav = 0, row_acc_init_rav_b = 0;
+	u32 row_acc_inc = 0, row_acc_offset = 0, row_acc_offset_b = 0;
+	/*
+	 * location of SC register in payload memory with respect to the first
+	 * register in the mmr address data block
+	 */
+	u32 *sc_reg9 = sc_reg8 + 1;
+	u32 *sc_reg12 = sc_reg8 + 4;
+	u32 *sc_reg13 = sc_reg8 + 5;
+	u32 *sc_reg24 = sc_reg17 + 7;
+
+	val = sc_reg0[0];
+
+	/* clear all the features(they may get enabled elsewhere later) */
+	val &= ~(CFG_SELFGEN_FID | CFG_TRIM | CFG_ENABLE_SIN2_VER_INTP |
+		CFG_INTERLACE_I | CFG_DCM_4X | CFG_DCM_2X | CFG_AUTO_HS |
+		CFG_ENABLE_EV | CFG_USE_RAV | CFG_INVT_FID | CFG_SC_BYPASS |
+		CFG_INTERLACE_O | CFG_Y_PK_EN | CFG_HP_BYPASS | CFG_LINEAR);
+
+	if (src_w == dst_w && src_h == dst_h) {
+		val |= CFG_SC_BYPASS;
+		sc_reg0[0] = val;
+		return;
+	}
+
+	/* we only support linear scaling for now */
+	val |= CFG_LINEAR;
+
+	/* configure horizontal scaler */
+
+	/* enable 2X or 4X decimation */
+	dcm_x = src_w / dst_w;
+	if (dcm_x > 4) {
+		val |= CFG_DCM_4X;
+		dcm_shift = 2;
+	} else if (dcm_x > 2) {
+		val |= CFG_DCM_2X;
+		dcm_shift = 1;
+	} else {
+		dcm_shift = 0;
+	}
+
+	lltmp = dst_w - 1;
+	lin_acc_inc = div64_u64(((u64)(src_w >> dcm_shift) - 1) << 24, lltmp);
+	lin_acc_inc_u = 0;
+	col_acc_offset = 0;
+
+	dev_dbg(dev, "hs config: src_w = %d, dst_w = %d, decimation = %s, lin_acc_inc = %08x\n",
+		src_w, dst_w, dcm_shift == 2 ? "4x" :
+		(dcm_shift == 1 ? "2x" : "none"), lin_acc_inc);
+
+	/* configure vertical scaler */
+
+	/* use RAV for vertical scaler if vertical downscaling is > 4x */
+	if (dst_h < (src_h >> 2)) {
+		use_rav = true;
+		val |= CFG_USE_RAV;
+	} else {
+		use_rav = false;
+	}
+
+	if (use_rav) {
+		/* use RAV */
+		factor = (u16) ((dst_h << 10) / src_h);
+
+		row_acc_init_rav = factor + ((1 + factor) >> 1);
+		if (row_acc_init_rav >= 1024)
+			row_acc_init_rav -= 1024;
+
+		row_acc_init_rav_b = row_acc_init_rav +
+				(1 + (row_acc_init_rav >> 1)) -
+				(1024 >> 1);
+
+		if (row_acc_init_rav_b < 0) {
+			row_acc_init_rav_b += row_acc_init_rav;
+			row_acc_init_rav *= 2;
+		}
+
+		dev_dbg(dev, "vs config(RAV): src_h = %d, dst_h = %d, factor = %d, acc_init = %08x, acc_init_b = %08x\n",
+			src_h, dst_h, factor, row_acc_init_rav,
+			row_acc_init_rav_b);
+	} else {
+		/* use polyphase */
+		row_acc_inc = ((src_h - 1) << 16) / (dst_h - 1);
+		row_acc_offset = 0;
+		row_acc_offset_b = 0;
+
+		dev_dbg(dev, "vs config(POLY): src_h = %d, dst_h = %d,row_acc_inc = %08x\n",
+			src_h, dst_h, row_acc_inc);
+	}
+
+
+	sc_reg0[0] = val;
+	sc_reg0[1] = row_acc_inc;
+	sc_reg0[2] = row_acc_offset;
+	sc_reg0[3] = row_acc_offset_b;
+
+	sc_reg0[4] = ((lin_acc_inc_u & CFG_LIN_ACC_INC_U_MASK) <<
+			CFG_LIN_ACC_INC_U_SHIFT) | (dst_w << CFG_TAR_W_SHIFT) |
+			(dst_h << CFG_TAR_H_SHIFT);
+
+	sc_reg0[5] = (src_w << CFG_SRC_W_SHIFT) | (src_h << CFG_SRC_H_SHIFT);
+
+	sc_reg0[6] = (row_acc_init_rav_b << CFG_ROW_ACC_INIT_RAV_B_SHIFT) |
+		(row_acc_init_rav << CFG_ROW_ACC_INIT_RAV_SHIFT);
+
+	*sc_reg9 = lin_acc_inc;
+
+	*sc_reg12 = col_acc_offset << CFG_COL_ACC_OFFSET_SHIFT;
+
+	*sc_reg13 = factor;
+
+	*sc_reg24 = (src_w << CFG_ORG_W_SHIFT) | (src_h << CFG_ORG_H_SHIFT);
+}
+EXPORT_SYMBOL(sc_config_scaler);
+
+struct sc_data *sc_create(struct platform_device *pdev, const char *res_name)
+{
+	struct sc_data *sc;
+
+	dev_dbg(&pdev->dev, "sc_create\n");
+
+	sc = devm_kzalloc(&pdev->dev, sizeof(*sc), GFP_KERNEL);
+	if (!sc) {
+		dev_err(&pdev->dev, "couldn't alloc sc_data\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	sc->pdev = pdev;
+
+	sc->res = platform_get_resource_byname(pdev, IORESOURCE_MEM, res_name);
+	if (!sc->res) {
+		dev_err(&pdev->dev, "missing '%s' platform resources data\n",
+			res_name);
+		return ERR_PTR(-ENODEV);
+	}
+
+	sc->base = devm_ioremap_resource(&pdev->dev, sc->res);
+	if (IS_ERR(sc->base)) {
+		dev_err(&pdev->dev, "failed to ioremap\n");
+		return ERR_CAST(sc->base);
+	}
+
+	return sc;
+}
+EXPORT_SYMBOL(sc_create);
+
+MODULE_DESCRIPTION("TI VIP/VPE Scaler");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_LICENSE("GPL v2");