1 /* 2 * Driver for Digigram VX soundcards 3 * 4 * IEC958 stuff 5 * 6 * Copyright (c) 2002 by Takashi Iwai <tiwai@suse.de> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 #include <linux/delay.h> 24 #include <sound/core.h> 25 #include <sound/vx_core.h> 26 #include "vx_cmd.h" 27 28 29 /* 30 * vx_modify_board_clock - tell the board that its clock has been modified 31 * @sync: DSP needs to resynchronize its FIFO 32 */ 33 static int vx_modify_board_clock(struct vx_core *chip, int sync) 34 { 35 struct vx_rmh rmh; 36 37 vx_init_rmh(&rmh, CMD_MODIFY_CLOCK); 38 /* Ask the DSP to resynchronize its FIFO. */ 39 if (sync) 40 rmh.Cmd[0] |= CMD_MODIFY_CLOCK_S_BIT; 41 return vx_send_msg(chip, &rmh); 42 } 43 44 /* 45 * vx_modify_board_inputs - resync audio inputs 46 */ 47 static int vx_modify_board_inputs(struct vx_core *chip) 48 { 49 struct vx_rmh rmh; 50 51 vx_init_rmh(&rmh, CMD_RESYNC_AUDIO_INPUTS); 52 rmh.Cmd[0] |= 1 << 0; /* reference: AUDIO 0 */ 53 return vx_send_msg(chip, &rmh); 54 } 55 56 /* 57 * vx_read_one_cbit - read one bit from UER config 58 * @index: the bit index 59 * returns 0 or 1. 60 */ 61 static int vx_read_one_cbit(struct vx_core *chip, int index) 62 { 63 unsigned long flags; 64 int val; 65 spin_lock_irqsave(&chip->lock, flags); 66 if (chip->type >= VX_TYPE_VXPOCKET) { 67 vx_outb(chip, CSUER, 1); /* read */ 68 vx_outb(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK); 69 val = (vx_inb(chip, RUER) >> 7) & 0x01; 70 } else { 71 vx_outl(chip, CSUER, 1); /* read */ 72 vx_outl(chip, RUER, index & XX_UER_CBITS_OFFSET_MASK); 73 val = (vx_inl(chip, RUER) >> 7) & 0x01; 74 } 75 spin_unlock_irqrestore(&chip->lock, flags); 76 return val; 77 } 78 79 /* 80 * vx_write_one_cbit - write one bit to UER config 81 * @index: the bit index 82 * @val: bit value, 0 or 1 83 */ 84 static void vx_write_one_cbit(struct vx_core *chip, int index, int val) 85 { 86 unsigned long flags; 87 val = !!val; /* 0 or 1 */ 88 spin_lock_irqsave(&chip->lock, flags); 89 if (vx_is_pcmcia(chip)) { 90 vx_outb(chip, CSUER, 0); /* write */ 91 vx_outb(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK)); 92 } else { 93 vx_outl(chip, CSUER, 0); /* write */ 94 vx_outl(chip, RUER, (val << 7) | (index & XX_UER_CBITS_OFFSET_MASK)); 95 } 96 spin_unlock_irqrestore(&chip->lock, flags); 97 } 98 99 /* 100 * vx_read_uer_status - read the current UER status 101 * @mode: pointer to store the UER mode, VX_UER_MODE_XXX 102 * 103 * returns the frequency of UER, or 0 if not sync, 104 * or a negative error code. 105 */ 106 static int vx_read_uer_status(struct vx_core *chip, int *mode) 107 { 108 int val, freq; 109 110 /* Default values */ 111 freq = 0; 112 113 /* Read UER status */ 114 if (vx_is_pcmcia(chip)) 115 val = vx_inb(chip, CSUER); 116 else 117 val = vx_inl(chip, CSUER); 118 if (val < 0) 119 return val; 120 /* If clock is present, read frequency */ 121 if (val & VX_SUER_CLOCK_PRESENT_MASK) { 122 switch (val & VX_SUER_FREQ_MASK) { 123 case VX_SUER_FREQ_32KHz_MASK: 124 freq = 32000; 125 break; 126 case VX_SUER_FREQ_44KHz_MASK: 127 freq = 44100; 128 break; 129 case VX_SUER_FREQ_48KHz_MASK: 130 freq = 48000; 131 break; 132 } 133 } 134 if (val & VX_SUER_DATA_PRESENT_MASK) 135 /* bit 0 corresponds to consumer/professional bit */ 136 *mode = vx_read_one_cbit(chip, 0) ? 137 VX_UER_MODE_PROFESSIONAL : VX_UER_MODE_CONSUMER; 138 else 139 *mode = VX_UER_MODE_NOT_PRESENT; 140 141 return freq; 142 } 143 144 145 /* 146 * compute the sample clock value from frequency 147 * 148 * The formula is as follows: 149 * 150 * HexFreq = (dword) ((double) ((double) 28224000 / (double) Frequency)) 151 * switch ( HexFreq & 0x00000F00 ) 152 * case 0x00000100: ; 153 * case 0x00000200: 154 * case 0x00000300: HexFreq -= 0x00000201 ; 155 * case 0x00000400: 156 * case 0x00000500: 157 * case 0x00000600: 158 * case 0x00000700: HexFreq = (dword) (((double) 28224000 / (double) (Frequency*2)) - 1) 159 * default : HexFreq = (dword) ((double) 28224000 / (double) (Frequency*4)) - 0x000001FF 160 */ 161 162 static int vx_calc_clock_from_freq(struct vx_core *chip, int freq) 163 { 164 int hexfreq; 165 166 snd_assert(freq > 0, return 0); 167 168 hexfreq = (28224000 * 10) / freq; 169 hexfreq = (hexfreq + 5) / 10; 170 171 /* max freq = 55125 Hz */ 172 snd_assert(hexfreq > 0x00000200, return 0); 173 174 if (hexfreq <= 0x03ff) 175 return hexfreq - 0x00000201; 176 if (hexfreq <= 0x07ff) 177 return (hexfreq / 2) - 1; 178 if (hexfreq <= 0x0fff) 179 return (hexfreq / 4) + 0x000001ff; 180 181 return 0x5fe; /* min freq = 6893 Hz */ 182 } 183 184 185 /* 186 * vx_change_clock_source - change the clock source 187 * @source: the new source 188 */ 189 static void vx_change_clock_source(struct vx_core *chip, int source) 190 { 191 unsigned long flags; 192 193 /* we mute DAC to prevent clicks */ 194 vx_toggle_dac_mute(chip, 1); 195 spin_lock_irqsave(&chip->lock, flags); 196 chip->ops->set_clock_source(chip, source); 197 chip->clock_source = source; 198 spin_unlock_irqrestore(&chip->lock, flags); 199 /* unmute */ 200 vx_toggle_dac_mute(chip, 0); 201 } 202 203 204 /* 205 * set the internal clock 206 */ 207 void vx_set_internal_clock(struct vx_core *chip, unsigned int freq) 208 { 209 int clock; 210 unsigned long flags; 211 /* Get real clock value */ 212 clock = vx_calc_clock_from_freq(chip, freq); 213 snd_printdd(KERN_DEBUG "set internal clock to 0x%x from freq %d\n", clock, freq); 214 spin_lock_irqsave(&chip->lock, flags); 215 if (vx_is_pcmcia(chip)) { 216 vx_outb(chip, HIFREQ, (clock >> 8) & 0x0f); 217 vx_outb(chip, LOFREQ, clock & 0xff); 218 } else { 219 vx_outl(chip, HIFREQ, (clock >> 8) & 0x0f); 220 vx_outl(chip, LOFREQ, clock & 0xff); 221 } 222 spin_unlock_irqrestore(&chip->lock, flags); 223 } 224 225 226 /* 227 * set the iec958 status bits 228 * @bits: 32-bit status bits 229 */ 230 void vx_set_iec958_status(struct vx_core *chip, unsigned int bits) 231 { 232 int i; 233 234 if (chip->chip_status & VX_STAT_IS_STALE) 235 return; 236 237 for (i = 0; i < 32; i++) 238 vx_write_one_cbit(chip, i, bits & (1 << i)); 239 } 240 241 242 /* 243 * vx_set_clock - change the clock and audio source if necessary 244 */ 245 int vx_set_clock(struct vx_core *chip, unsigned int freq) 246 { 247 int src_changed = 0; 248 249 if (chip->chip_status & VX_STAT_IS_STALE) 250 return 0; 251 252 /* change the audio source if possible */ 253 vx_sync_audio_source(chip); 254 255 if (chip->clock_mode == VX_CLOCK_MODE_EXTERNAL || 256 (chip->clock_mode == VX_CLOCK_MODE_AUTO && 257 chip->audio_source == VX_AUDIO_SRC_DIGITAL)) { 258 if (chip->clock_source != UER_SYNC) { 259 vx_change_clock_source(chip, UER_SYNC); 260 mdelay(6); 261 src_changed = 1; 262 } 263 } else if (chip->clock_mode == VX_CLOCK_MODE_INTERNAL || 264 (chip->clock_mode == VX_CLOCK_MODE_AUTO && 265 chip->audio_source != VX_AUDIO_SRC_DIGITAL)) { 266 if (chip->clock_source != INTERNAL_QUARTZ) { 267 vx_change_clock_source(chip, INTERNAL_QUARTZ); 268 src_changed = 1; 269 } 270 if (chip->freq == freq) 271 return 0; 272 vx_set_internal_clock(chip, freq); 273 if (src_changed) 274 vx_modify_board_inputs(chip); 275 } 276 if (chip->freq == freq) 277 return 0; 278 chip->freq = freq; 279 vx_modify_board_clock(chip, 1); 280 return 0; 281 } 282 283 284 /* 285 * vx_change_frequency - called from interrupt handler 286 */ 287 int vx_change_frequency(struct vx_core *chip) 288 { 289 int freq; 290 291 if (chip->chip_status & VX_STAT_IS_STALE) 292 return 0; 293 294 if (chip->clock_source == INTERNAL_QUARTZ) 295 return 0; 296 /* 297 * Read the real UER board frequency 298 */ 299 freq = vx_read_uer_status(chip, &chip->uer_detected); 300 if (freq < 0) 301 return freq; 302 /* 303 * The frequency computed by the DSP is good and 304 * is different from the previous computed. 305 */ 306 if (freq == 48000 || freq == 44100 || freq == 32000) 307 chip->freq_detected = freq; 308 309 return 0; 310 } 311