drivers/media/common/b2c2/flexcop-sram.c

   1 /*
   2  * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
   3  * flexcop-sram.c - functions for controlling the SRAM
   4  * see flexcop.c for copyright information
   5  */
   6 #include "flexcop.h"
   7
   8 static void flexcop_sram_set_chip(struct flexcop_device *fc,
   9                 flexcop_sram_type_t type)
  10 {
  11         flexcop_set_ibi_value(wan_ctrl_reg_71c, sram_chip, type);
  12 }
  13
  14 int flexcop_sram_init(struct flexcop_device *fc)
  15 {
  16         switch (fc->rev) {
  17         case FLEXCOP_II:
  18         case FLEXCOP_IIB:
  19                 flexcop_sram_set_chip(fc, FC_SRAM_1_32KB);
  20                 break;
  21         case FLEXCOP_III:
  22                 flexcop_sram_set_chip(fc, FC_SRAM_1_48KB);
  23                 break;
  24         default:
  25                 return -EINVAL;
  26         }
  27         return 0;
  28 }
  29
  30 int flexcop_sram_set_dest(struct flexcop_device *fc, flexcop_sram_dest_t dest,
  31                  flexcop_sram_dest_target_t target)
  32 {
  33         flexcop_ibi_value v;
  34         v = fc->read_ibi_reg(fc, sram_dest_reg_714);
  35
  36         if (fc->rev != FLEXCOP_III && target == FC_SRAM_DEST_TARGET_FC3_CA) {
  37                 err("SRAM destination target to available on FlexCopII(b)\n");
  38                 return -EINVAL;
  39         }
  40         deb_sram("sram dest: %x target: %x\n", dest, target);
  41
  42         if (dest & FC_SRAM_DEST_NET)
  43                 v.sram_dest_reg_714.NET_Dest = target;
  44         if (dest & FC_SRAM_DEST_CAI)
  45                 v.sram_dest_reg_714.CAI_Dest = target;
  46         if (dest & FC_SRAM_DEST_CAO)
  47                 v.sram_dest_reg_714.CAO_Dest = target;
  48         if (dest & FC_SRAM_DEST_MEDIA)
  49                 v.sram_dest_reg_714.MEDIA_Dest = target;
  50
  51         fc->write_ibi_reg(fc,sram_dest_reg_714,v);
  52         udelay(1000); /* TODO delay really necessary */
  53
  54         return 0;
  55 }
  56 EXPORT_SYMBOL(flexcop_sram_set_dest);
  57
  58 void flexcop_wan_set_speed(struct flexcop_device *fc, flexcop_wan_speed_t s)
  59 {
  60         flexcop_set_ibi_value(wan_ctrl_reg_71c,wan_speed_sig,s);
  61 }
  62 EXPORT_SYMBOL(flexcop_wan_set_speed);
  63
  64 void flexcop_sram_ctrl(struct flexcop_device *fc, int usb_wan, int sramdma, int maximumfill)
  65 {
  66         flexcop_ibi_value v = fc->read_ibi_reg(fc,sram_dest_reg_714);
  67         v.sram_dest_reg_714.ctrl_usb_wan = usb_wan;
  68         v.sram_dest_reg_714.ctrl_sramdma = sramdma;
  69         v.sram_dest_reg_714.ctrl_maximumfill = maximumfill;
  70         fc->write_ibi_reg(fc,sram_dest_reg_714,v);
  71 }
  72 EXPORT_SYMBOL(flexcop_sram_ctrl);
  73
  74 #if 0
  75 static void flexcop_sram_write(struct adapter *adapter, u32 bank, u32 addr, u8 *buf, u32 len)
  76 {
  77         int i, retries;
  78         u32 command;
  79
  80         for (i = 0; i < len; i++) {
  81                 command = bank | addr | 0x04000000 | (*buf << 0x10);
  82
  83                 retries = 2;
  84
  85                 while (((read_reg_dw(adapter, 0x700) & 0x80000000) != 0) && (retries > 0)) {
  86                         mdelay(1);
  87                         retries--;
  88                 }
  89
  90                 if (retries == 0)
  91                         printk("%s: SRAM timeout\n", __func__);
  92
  93                 write_reg_dw(adapter, 0x700, command);
  94
  95                 buf++;
  96                 addr++;
  97         }
  98 }
  99
 100 static void flex_sram_read(struct adapter *adapter, u32 bank, u32 addr, u8 *buf, u32 len)
 101 {
 102         int i, retries;
 103         u32 command, value;
 104
 105         for (i = 0; i < len; i++) {
 106                 command = bank | addr | 0x04008000;
 107
 108                 retries = 10000;
 109
 110                 while (((read_reg_dw(adapter, 0x700) & 0x80000000) != 0) && (retries > 0)) {
 111                         mdelay(1);
 112                         retries--;
 113                 }
 114
 115                 if (retries == 0)
 116                         printk("%s: SRAM timeout\n", __func__);
 117
 118                 write_reg_dw(adapter, 0x700, command);
 119
 120                 retries = 10000;
 121
 122                 while (((read_reg_dw(adapter, 0x700) & 0x80000000) != 0) && (retries > 0)) {
 123                         mdelay(1);
 124                         retries--;
 125                 }
 126
 127                 if (retries == 0)
 128                         printk("%s: SRAM timeout\n", __func__);
 129
 130                 value = read_reg_dw(adapter, 0x700) >> 0x10;
 131
 132                 *buf = (value & 0xff);
 133
 134                 addr++;
 135                 buf++;
 136         }
 137 }
 138
 139 static void sram_write_chunk(struct adapter *adapter, u32 addr, u8 *buf, u16 len)
 140 {
 141         u32 bank;
 142
 143         bank = 0;
 144
 145         if (adapter->dw_sram_type == 0x20000) {
 146                 bank = (addr & 0x18000) << 0x0d;
 147         }
 148
 149         if (adapter->dw_sram_type == 0x00000) {
 150                 if ((addr >> 0x0f) == 0)
 151                         bank = 0x20000000;
 152                 else
 153                         bank = 0x10000000;
 154         }
 155         flex_sram_write(adapter, bank, addr & 0x7fff, buf, len);
 156 }
 157
 158 static void sram_read_chunk(struct adapter *adapter, u32 addr, u8 *buf, u16 len)
 159 {
 160         u32 bank;
 161         bank = 0;
 162
 163         if (adapter->dw_sram_type == 0x20000) {
 164                 bank = (addr & 0x18000) << 0x0d;
 165         }
 166
 167         if (adapter->dw_sram_type == 0x00000) {
 168                 if ((addr >> 0x0f) == 0)
 169                         bank = 0x20000000;
 170                 else
 171                         bank = 0x10000000;
 172         }
 173         flex_sram_read(adapter, bank, addr & 0x7fff, buf, len);
 174 }
 175
 176 static void sram_read(struct adapter *adapter, u32 addr, u8 *buf, u32 len)
 177 {
 178         u32 length;
 179         while (len != 0) {
 180                 length = len;
 181                 /* check if the address range belongs to the same
 182                  * 32K memory chip. If not, the data is read
 183                  * from one chip at a time */
 184                 if ((addr >> 0x0f) != ((addr + len - 1) >> 0x0f)) {
 185                         length = (((addr >> 0x0f) + 1) << 0x0f) - addr;
 186                 }
 187
 188                 sram_read_chunk(adapter, addr, buf, length);
 189                 addr = addr + length;
 190                 buf = buf + length;
 191                 len = len - length;
 192         }
 193 }
 194
 195 static void sram_write(struct adapter *adapter, u32 addr, u8 *buf, u32 len)
 196 {
 197         u32 length;
 198         while (len != 0) {
 199                 length = len;
 200
 201                 /* check if the address range belongs to the same
 202                  * 32K memory chip. If not, the data is
 203                  * written to one chip at a time */
 204                 if ((addr >> 0x0f) != ((addr + len - 1) >> 0x0f)) {
 205                         length = (((addr >> 0x0f) + 1) << 0x0f) - addr;
 206                 }
 207
 208                 sram_write_chunk(adapter, addr, buf, length);
 209                 addr = addr + length;
 210                 buf = buf + length;
 211                 len = len - length;
 212         }
 213 }
 214
 215 static void sram_set_size(struct adapter *adapter, u32 mask)
 216 {
 217         write_reg_dw(adapter, 0x71c,
 218                         (mask | (~0x30000 & read_reg_dw(adapter, 0x71c))));
 219 }
 220
 221 static void sram_init(struct adapter *adapter)
 222 {
 223         u32 tmp;
 224         tmp = read_reg_dw(adapter, 0x71c);
 225         write_reg_dw(adapter, 0x71c, 1);
 226
 227         if (read_reg_dw(adapter, 0x71c) != 0) {
 228                 write_reg_dw(adapter, 0x71c, tmp);
 229                 adapter->dw_sram_type = tmp & 0x30000;
 230                 ddprintk("%s: dw_sram_type = %x\n", __func__, adapter->dw_sram_type);
 231         } else {
 232                 adapter->dw_sram_type = 0x10000;
 233                 ddprintk("%s: dw_sram_type = %x\n", __func__, adapter->dw_sram_type);
 234         }
 235 }
 236
 237 static int sram_test_location(struct adapter *adapter, u32 mask, u32 addr)
 238 {
 239         u8 tmp1, tmp2;
 240         dprintk("%s: mask = %x, addr = %x\n", __func__, mask, addr);
 241
 242         sram_set_size(adapter, mask);
 243         sram_init(adapter);
 244
 245         tmp2 = 0xa5;
 246         tmp1 = 0x4f;
 247
 248         sram_write(adapter, addr, &tmp2, 1);
 249         sram_write(adapter, addr + 4, &tmp1, 1);
 250
 251         tmp2 = 0;
 252         mdelay(20);
 253
 254         sram_read(adapter, addr, &tmp2, 1);
 255         sram_read(adapter, addr, &tmp2, 1);
 256
 257         dprintk("%s: wrote 0xa5, read 0x%2x\n", __func__, tmp2);
 258
 259         if (tmp2 != 0xa5)
 260                 return 0;
 261
 262         tmp2 = 0x5a;
 263         tmp1 = 0xf4;
 264
 265         sram_write(adapter, addr, &tmp2, 1);
 266         sram_write(adapter, addr + 4, &tmp1, 1);
 267
 268         tmp2 = 0;
 269         mdelay(20);
 270
 271         sram_read(adapter, addr, &tmp2, 1);
 272         sram_read(adapter, addr, &tmp2, 1);
 273
 274         dprintk("%s: wrote 0x5a, read 0x%2x\n", __func__, tmp2);
 275
 276         if (tmp2 != 0x5a)
 277                 return 0;
 278         return 1;
 279 }
 280
 281 static u32 sram_length(struct adapter *adapter)
 282 {
 283         if (adapter->dw_sram_type == 0x10000)
 284                 return 32768; /* 32K */
 285         if (adapter->dw_sram_type == 0x00000)
 286                 return 65536; /* 64K */
 287         if (adapter->dw_sram_type == 0x20000)
 288                 return 131072; /* 128K */
 289         return 32768; /* 32K */
 290 }
 291
 292 /* FlexcopII can work with 32K, 64K or 128K of external SRAM memory.
 293    - for 128K there are 4x32K chips at bank 0,1,2,3.
 294    - for  64K there are 2x32K chips at bank 1,2.
 295    - for  32K there is one 32K chip at bank 0.
 296
 297    FlexCop works only with one bank at a time. The bank is selected
 298    by bits 28-29 of the 0x700 register.
 299
 300    bank 0 covers addresses 0x00000-0x07fff
 301    bank 1 covers addresses 0x08000-0x0ffff
 302    bank 2 covers addresses 0x10000-0x17fff
 303    bank 3 covers addresses 0x18000-0x1ffff */
 304
 305 static int flexcop_sram_detect(struct flexcop_device *fc)
 306 {
 307         flexcop_ibi_value r208, r71c_0, vr71c_1;
 308         r208 = fc->read_ibi_reg(fc, ctrl_208);
 309         fc->write_ibi_reg(fc, ctrl_208, ibi_zero);
 310
 311         r71c_0 = fc->read_ibi_reg(fc, wan_ctrl_reg_71c);
 312         write_reg_dw(adapter, 0x71c, 1);
 313         tmp3 = read_reg_dw(adapter, 0x71c);
 314         dprintk("%s: tmp3 = %x\n", __func__, tmp3);
 315         write_reg_dw(adapter, 0x71c, tmp2);
 316
 317         // check for internal SRAM ???
 318         tmp3--;
 319         if (tmp3 != 0) {
 320                 sram_set_size(adapter, 0x10000);
 321                 sram_init(adapter);
 322                 write_reg_dw(adapter, 0x208, tmp);
 323                 dprintk("%s: sram size = 32K\n", __func__);
 324                 return 32;
 325         }
 326
 327         if (sram_test_location(adapter, 0x20000, 0x18000) != 0) {
 328                 sram_set_size(adapter, 0x20000);
 329                 sram_init(adapter);
 330                 write_reg_dw(adapter, 0x208, tmp);
 331                 dprintk("%s: sram size = 128K\n", __func__);
 332                 return 128;
 333         }
 334
 335         if (sram_test_location(adapter, 0x00000, 0x10000) != 0) {
 336                 sram_set_size(adapter, 0x00000);
 337                 sram_init(adapter);
 338                 write_reg_dw(adapter, 0x208, tmp);
 339                 dprintk("%s: sram size = 64K\n", __func__);
 340                 return 64;
 341         }
 342
 343         if (sram_test_location(adapter, 0x10000, 0x00000) != 0) {
 344                 sram_set_size(adapter, 0x10000);
 345                 sram_init(adapter);
 346                 write_reg_dw(adapter, 0x208, tmp);
 347                 dprintk("%s: sram size = 32K\n", __func__);
 348                 return 32;
 349         }
 350
 351         sram_set_size(adapter, 0x10000);
 352         sram_init(adapter);
 353         write_reg_dw(adapter, 0x208, tmp);
 354         dprintk("%s: SRAM detection failed. Set to 32K \n", __func__);
 355         return 0;
 356 }
 357
 358 static void sll_detect_sram_size(struct adapter *adapter)
 359 {
 360         sram_detect_for_flex2(adapter);
 361 }
 362
 363 #endif