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path: root/drivers/media/platform/ti-vpe/sc.c
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-rw-r--r--drivers/media/platform/ti-vpe/sc.c311
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 000000000000..93f0af546b76
--- /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/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;
+
+ u32 read_reg(struct sc_data *sc, int offset)
+ {
+ return ioread32(sc->base + offset);
+ }
+
+#define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, read_reg(sc, CFG_##r))
+
+ 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
+}
+
+/*
+ * 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;
+ }
+ }
+
+ if (idx == sc->hs_index)
+ return;
+
+ 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->hs_index = idx;
+
+ sc->load_coeff_h = true;
+}
+
+/*
+ * 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;
+ }
+
+ if (idx == sc->vs_index)
+ return;
+
+ 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->vs_index = idx;
+ sc->load_coeff_v = true;
+}
+
+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);
+}
+
+struct sc_data *sc_create(struct platform_device *pdev)
+{
+ 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, "sc");
+ if (!sc->res) {
+ dev_err(&pdev->dev, "missing platform resources data\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ sc->base = devm_ioremap_resource(&pdev->dev, sc->res);
+ if (!sc->base) {
+ dev_err(&pdev->dev, "failed to ioremap\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return sc;
+}