1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Scaler library
4 *
5 * Copyright (c) 2013 Texas Instruments Inc.
6 *
7 * David Griego, <dagriego@biglakesoftware.com>
8 * Dale Farnsworth, <dale@farnsworth.org>
9 * Archit Taneja, <archit@ti.com>
10 */
11
12 #include <linux/err.h>
13 #include <linux/io.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17
18 #include "sc.h"
19 #include "sc_coeff.h"
20
sc_dump_regs(struct sc_data * sc)21 void sc_dump_regs(struct sc_data *sc)
22 {
23 struct device *dev = &sc->pdev->dev;
24
25 #define DUMPREG(r) dev_dbg(dev, "%-35s %08x\n", #r, \
26 ioread32(sc->base + CFG_##r))
27
28 dev_dbg(dev, "SC Registers @ %pa:\n", &sc->res->start);
29
30 DUMPREG(SC0);
31 DUMPREG(SC1);
32 DUMPREG(SC2);
33 DUMPREG(SC3);
34 DUMPREG(SC4);
35 DUMPREG(SC5);
36 DUMPREG(SC6);
37 DUMPREG(SC8);
38 DUMPREG(SC9);
39 DUMPREG(SC10);
40 DUMPREG(SC11);
41 DUMPREG(SC12);
42 DUMPREG(SC13);
43 DUMPREG(SC17);
44 DUMPREG(SC18);
45 DUMPREG(SC19);
46 DUMPREG(SC20);
47 DUMPREG(SC21);
48 DUMPREG(SC22);
49 DUMPREG(SC23);
50 DUMPREG(SC24);
51 DUMPREG(SC25);
52
53 #undef DUMPREG
54 }
55 EXPORT_SYMBOL(sc_dump_regs);
56
57 /*
58 * set the horizontal scaler coefficients according to the ratio of output to
59 * input widths, after accounting for up to two levels of decimation
60 */
sc_set_hs_coeffs(struct sc_data * sc,void * addr,unsigned int src_w,unsigned int dst_w)61 void sc_set_hs_coeffs(struct sc_data *sc, void *addr, unsigned int src_w,
62 unsigned int dst_w)
63 {
64 int sixteenths;
65 int idx;
66 int i, j;
67 u16 *coeff_h = addr;
68 const u16 *cp;
69
70 if (dst_w > src_w) {
71 idx = HS_UP_SCALE;
72 } else {
73 if ((dst_w << 1) < src_w)
74 dst_w <<= 1; /* first level decimation */
75 if ((dst_w << 1) < src_w)
76 dst_w <<= 1; /* second level decimation */
77
78 if (dst_w == src_w) {
79 idx = HS_LE_16_16_SCALE;
80 } else {
81 sixteenths = (dst_w << 4) / src_w;
82 if (sixteenths < 8)
83 sixteenths = 8;
84 idx = HS_LT_9_16_SCALE + sixteenths - 8;
85 }
86 }
87
88 cp = scaler_hs_coeffs[idx];
89
90 for (i = 0; i < SC_NUM_PHASES * 2; i++) {
91 for (j = 0; j < SC_H_NUM_TAPS; j++)
92 *coeff_h++ = *cp++;
93 /*
94 * for each phase, the scaler expects space for 8 coefficients
95 * in it's memory. For the horizontal scaler, we copy the first
96 * 7 coefficients and skip the last slot to move to the next
97 * row to hold coefficients for the next phase
98 */
99 coeff_h += SC_NUM_TAPS_MEM_ALIGN - SC_H_NUM_TAPS;
100 }
101
102 sc->load_coeff_h = true;
103 }
104 EXPORT_SYMBOL(sc_set_hs_coeffs);
105
106 /*
107 * set the vertical scaler coefficients according to the ratio of output to
108 * input heights
109 */
sc_set_vs_coeffs(struct sc_data * sc,void * addr,unsigned int src_h,unsigned int dst_h)110 void sc_set_vs_coeffs(struct sc_data *sc, void *addr, unsigned int src_h,
111 unsigned int dst_h)
112 {
113 int sixteenths;
114 int idx;
115 int i, j;
116 u16 *coeff_v = addr;
117 const u16 *cp;
118
119 if (dst_h > src_h) {
120 idx = VS_UP_SCALE;
121 } else if (dst_h == src_h) {
122 idx = VS_1_TO_1_SCALE;
123 } else {
124 sixteenths = (dst_h << 4) / src_h;
125 if (sixteenths < 8)
126 sixteenths = 8;
127 idx = VS_LT_9_16_SCALE + sixteenths - 8;
128 }
129
130 cp = scaler_vs_coeffs[idx];
131
132 for (i = 0; i < SC_NUM_PHASES * 2; i++) {
133 for (j = 0; j < SC_V_NUM_TAPS; j++)
134 *coeff_v++ = *cp++;
135 /*
136 * for the vertical scaler, we copy the first 5 coefficients and
137 * skip the last 3 slots to move to the next row to hold
138 * coefficients for the next phase
139 */
140 coeff_v += SC_NUM_TAPS_MEM_ALIGN - SC_V_NUM_TAPS;
141 }
142
143 sc->load_coeff_v = true;
144 }
145 EXPORT_SYMBOL(sc_set_vs_coeffs);
146
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)147 void sc_config_scaler(struct sc_data *sc, u32 *sc_reg0, u32 *sc_reg8,
148 u32 *sc_reg17, unsigned int src_w, unsigned int src_h,
149 unsigned int dst_w, unsigned int dst_h)
150 {
151 struct device *dev = &sc->pdev->dev;
152 u32 val;
153 int dcm_x, dcm_shift;
154 bool use_rav;
155 unsigned long lltmp;
156 u32 lin_acc_inc, lin_acc_inc_u;
157 u32 col_acc_offset;
158 u16 factor = 0;
159 int row_acc_init_rav = 0, row_acc_init_rav_b = 0;
160 u32 row_acc_inc = 0, row_acc_offset = 0, row_acc_offset_b = 0;
161 /*
162 * location of SC register in payload memory with respect to the first
163 * register in the mmr address data block
164 */
165 u32 *sc_reg9 = sc_reg8 + 1;
166 u32 *sc_reg12 = sc_reg8 + 4;
167 u32 *sc_reg13 = sc_reg8 + 5;
168 u32 *sc_reg24 = sc_reg17 + 7;
169
170 val = sc_reg0[0];
171
172 /* clear all the features(they may get enabled elsewhere later) */
173 val &= ~(CFG_SELFGEN_FID | CFG_TRIM | CFG_ENABLE_SIN2_VER_INTP |
174 CFG_INTERLACE_I | CFG_DCM_4X | CFG_DCM_2X | CFG_AUTO_HS |
175 CFG_ENABLE_EV | CFG_USE_RAV | CFG_INVT_FID | CFG_SC_BYPASS |
176 CFG_INTERLACE_O | CFG_Y_PK_EN | CFG_HP_BYPASS | CFG_LINEAR);
177
178 if (src_w == dst_w && src_h == dst_h) {
179 val |= CFG_SC_BYPASS;
180 sc_reg0[0] = val;
181 return;
182 }
183
184 /* we only support linear scaling for now */
185 val |= CFG_LINEAR;
186
187 /* configure horizontal scaler */
188
189 /* enable 2X or 4X decimation */
190 dcm_x = src_w / dst_w;
191 if (dcm_x > 4) {
192 val |= CFG_DCM_4X;
193 dcm_shift = 2;
194 } else if (dcm_x > 2) {
195 val |= CFG_DCM_2X;
196 dcm_shift = 1;
197 } else {
198 dcm_shift = 0;
199 }
200
201 lltmp = dst_w - 1;
202 lin_acc_inc = div64_u64(((u64)(src_w >> dcm_shift) - 1) << 24, lltmp);
203 lin_acc_inc_u = 0;
204 col_acc_offset = 0;
205
206 dev_dbg(dev, "hs config: src_w = %d, dst_w = %d, decimation = %s, lin_acc_inc = %08x\n",
207 src_w, dst_w, dcm_shift == 2 ? "4x" :
208 (dcm_shift == 1 ? "2x" : "none"), lin_acc_inc);
209
210 /* configure vertical scaler */
211
212 /* use RAV for vertical scaler if vertical downscaling is > 4x */
213 if (dst_h < (src_h >> 2)) {
214 use_rav = true;
215 val |= CFG_USE_RAV;
216 } else {
217 use_rav = false;
218 }
219
220 if (use_rav) {
221 /* use RAV */
222 factor = (u16) ((dst_h << 10) / src_h);
223
224 row_acc_init_rav = factor + ((1 + factor) >> 1);
225 if (row_acc_init_rav >= 1024)
226 row_acc_init_rav -= 1024;
227
228 row_acc_init_rav_b = row_acc_init_rav +
229 (1 + (row_acc_init_rav >> 1)) -
230 (1024 >> 1);
231
232 if (row_acc_init_rav_b < 0) {
233 row_acc_init_rav_b += row_acc_init_rav;
234 row_acc_init_rav *= 2;
235 }
236
237 dev_dbg(dev, "vs config(RAV): src_h = %d, dst_h = %d, factor = %d, acc_init = %08x, acc_init_b = %08x\n",
238 src_h, dst_h, factor, row_acc_init_rav,
239 row_acc_init_rav_b);
240 } else {
241 /* use polyphase */
242 row_acc_inc = ((src_h - 1) << 16) / (dst_h - 1);
243 row_acc_offset = 0;
244 row_acc_offset_b = 0;
245
246 dev_dbg(dev, "vs config(POLY): src_h = %d, dst_h = %d,row_acc_inc = %08x\n",
247 src_h, dst_h, row_acc_inc);
248 }
249
250
251 sc_reg0[0] = val;
252 sc_reg0[1] = row_acc_inc;
253 sc_reg0[2] = row_acc_offset;
254 sc_reg0[3] = row_acc_offset_b;
255
256 sc_reg0[4] = ((lin_acc_inc_u & CFG_LIN_ACC_INC_U_MASK) <<
257 CFG_LIN_ACC_INC_U_SHIFT) | (dst_w << CFG_TAR_W_SHIFT) |
258 (dst_h << CFG_TAR_H_SHIFT);
259
260 sc_reg0[5] = (src_w << CFG_SRC_W_SHIFT) | (src_h << CFG_SRC_H_SHIFT);
261
262 sc_reg0[6] = (row_acc_init_rav_b << CFG_ROW_ACC_INIT_RAV_B_SHIFT) |
263 (row_acc_init_rav << CFG_ROW_ACC_INIT_RAV_SHIFT);
264
265 *sc_reg9 = lin_acc_inc;
266
267 *sc_reg12 = col_acc_offset << CFG_COL_ACC_OFFSET_SHIFT;
268
269 *sc_reg13 = factor;
270
271 *sc_reg24 = (src_w << CFG_ORG_W_SHIFT) | (src_h << CFG_ORG_H_SHIFT);
272 }
273 EXPORT_SYMBOL(sc_config_scaler);
274
sc_create(struct platform_device * pdev,const char * res_name)275 struct sc_data *sc_create(struct platform_device *pdev, const char *res_name)
276 {
277 struct sc_data *sc;
278
279 dev_dbg(&pdev->dev, "sc_create\n");
280
281 sc = devm_kzalloc(&pdev->dev, sizeof(*sc), GFP_KERNEL);
282 if (!sc) {
283 dev_err(&pdev->dev, "couldn't alloc sc_data\n");
284 return ERR_PTR(-ENOMEM);
285 }
286
287 sc->pdev = pdev;
288
289 sc->res = platform_get_resource_byname(pdev, IORESOURCE_MEM, res_name);
290 if (!sc->res) {
291 dev_err(&pdev->dev, "missing '%s' platform resources data\n",
292 res_name);
293 return ERR_PTR(-ENODEV);
294 }
295
296 sc->base = devm_ioremap_resource(&pdev->dev, sc->res);
297 if (IS_ERR(sc->base)) {
298 dev_err(&pdev->dev, "failed to ioremap\n");
299 return ERR_CAST(sc->base);
300 }
301
302 return sc;
303 }
304 EXPORT_SYMBOL(sc_create);
305
306 MODULE_DESCRIPTION("TI VIP/VPE Scaler");
307 MODULE_AUTHOR("Texas Instruments Inc.");
308 MODULE_LICENSE("GPL v2");
309
