/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright © 2009 Bertrik Sikken * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include #include "config.h" #include "system.h" #include "audio.h" #include "s5l8700.h" #include "panic.h" #include "audiohw.h" #include "pcm.h" #include "pcm_sampr.h" #include "dma-target.h" #include "mmu-arm.h" /* Driver for the IIS/PCM part of the s5l8700 using DMA Notes: - not all possible PCM sample rates are enabled (no support in codec driver) - pcm_play_dma_pause is untested, not sure if implemented the right way - pcm_play_dma_stop is untested, not sure if implemented the right way - recording is not implemented */ static volatile int locked = 0; size_t nextsize; size_t dblbufsize; int dmamode; const unsigned char* dblbuf; /* table of recommended PLL/MCLK dividers for mode 256Fs from the datasheet */ static const struct div_entry { int pdiv, mdiv, sdiv, cdiv; } div_table[HW_NUM_FREQ] = { #ifdef IPOD_NANO2G [HW_FREQ_11] = { 2, 41, 5, 4}, [HW_FREQ_22] = { 2, 41, 4, 4}, [HW_FREQ_44] = { 2, 41, 3, 4}, [HW_FREQ_88] = { 2, 41, 2, 4}, #if 0 /* disabled because the codec driver does not support it (yet) */ [HW_FREQ_8 ] = { 2, 12, 3, 9}, [HW_FREQ_16] = { 2, 12, 2, 9}, [HW_FREQ_32] = { 2, 12, 1, 9}, [HW_FREQ_12] = { 2, 12, 4, 3}, [HW_FREQ_24] = { 2, 12, 3, 3}, [HW_FREQ_48] = { 2, 12, 2, 3}, [HW_FREQ_96] = { 2, 12, 1, 3}, #endif #else [HW_FREQ_11] = { 26, 189, 3, 8}, [HW_FREQ_22] = { 50, 98, 2, 8}, [HW_FREQ_44] = { 37, 151, 1, 9}, [HW_FREQ_88] = { 50, 98, 1, 4}, #if 0 /* disabled because the codec driver does not support it (yet) */ [HW_FREQ_8 ] = { 28, 192, 3, 12}, [HW_FREQ_16] = { 28, 192, 3, 6}, [HW_FREQ_32] = { 28, 192, 2, 6}, [HW_FREQ_12] = { 28, 192, 3, 8}, [HW_FREQ_24] = { 28, 192, 2, 8}, [HW_FREQ_48] = { 28, 192, 2, 4}, [HW_FREQ_96] = { 28, 192, 1, 4}, #endif #endif }; /* Mask the DMA interrupt */ void pcm_play_lock(void) { if (locked++ == 0) { INTMSK &= ~(1 << 10); } } /* Unmask the DMA interrupt if enabled */ void pcm_play_unlock(void) { if (--locked == 0) { INTMSK |= (1 << 10); } } static const void* dma_callback(void) ICODE_ATTR __attribute__((used)); static const void* dma_callback(void) { if (dmamode) { void *dma_start_addr; pcm_play_get_more_callback(&dma_start_addr, &nextsize); if (nextsize != 0) { if (nextsize >= 4096) { dblbufsize = (nextsize >> 4) & ~3; nextsize = nextsize - dblbufsize; dblbuf = dma_start_addr + nextsize; dmamode = 0; } nextsize = (nextsize >> 1) - 1; clean_dcache(); return dma_start_addr; } else { nextsize = -1; return 0; } } else { dmamode = 1; nextsize = (dblbufsize >> 1) - 1; return dblbuf; } } void fiq_handler(void) __attribute__((interrupt ("FIQ"), naked)) ICODE_ATTR; void fiq_handler(void) { asm volatile ( "cmn r11, #1 \n" "strne r10, [r8] \n" /* DMABASE0 */ "strne r11, [r8,#0x08] \n" /* DMATCNT0 */ "strne r9, [r8,#0x14] \n" /* DMACOM0 */ "moveq r10, #5 \n" /* STOP DMA */ "streq r10, [r8,#0x14] \n" /* DMACOM0 */ "mov r10, #7 \n" /* CLEAR IRQ */ "str r10, [r8,#0x14] \n" /* DMACOM0 */ "mov r11, #0x39C00000 \n" /* SRCPND */ "mov r10, #0x00000400 \n" /* INT_DMA */ "str r10, [r11] \n" /* ACK FIQ */ "stmfd sp!, {r0-r3,lr} \n" "bl dma_callback \n" "mov r10, r0 \n" "ldmfd sp!, {r0-r3,lr} \n" "ldr r11, =nextsize \n" "ldr r11, [r11] \n" "subs pc, lr, #4 \n" ); } void bootstrap_fiq(const void* addr, size_t tcnt) __attribute__((naked,noinline)); void bootstrap_fiq(const void* addr, size_t tcnt) { (void)addr; (void)tcnt; asm volatile ( "add r2, lr, #4 \n" "mrs r3, cpsr \n" "msr cpsr_c, #0xD1 \n" /* FIQ mode, IRQ/FIQ disabled */ "mov r8, #0x38400000 \n" /* DMA BASE */ "mov r9, #4 \n" /* START DMA */ "mov r10, r0 \n" "mov r11, r1 \n" "mov r0, #0 \n" "ldr r12, =fiq_handler \n" "ldr sp, =_fiqstackend \n" "mov lr, r2 \n" "msr spsr_all, r3 \n" "bx r12 \n" ); } void pcm_play_dma_start(const void *addr_in, size_t size) { unsigned char* addr = (unsigned char*)addr_in; /* S1: DMA channel 0 set */ DMACON0 = (0 << 30) | /* DEVSEL */ (1 << 29) | /* DIR */ (0 << 24) | /* SCHCNT */ (1 << 22) | /* DSIZE */ (0 << 19) | /* BLEN */ (0 << 18) | /* RELOAD */ (0 << 17) | /* HCOMINT */ (1 << 16) | /* WCOMINT */ (0 << 0); /* OFFSET */ #ifdef IPOD_NANO2G PCON5 = (PCON5 & ~(0xFFFF0000)) | 0x77720000; PCON6 = (PCON6 & ~(0x0F000000)) | 0x02000000; I2STXCON = (1 << 20) | /* undocumented */ (0 << 16) | /* burst length */ (0 << 15) | /* 0 = falling edge */ (0 << 13) | /* 0 = basic I2S format */ (0 << 12) | /* 0 = MSB first */ (0 << 11) | /* 0 = left channel for low polarity */ (5 << 8) | /* MCLK divider */ (0 << 5) | /* 0 = 16-bit */ (2 << 3) | /* bit clock per frame */ (1 << 0); /* channel index */ #else /* S2: IIS Tx mode set */ I2STXCON = (DMA_IISOUT_BLEN << 16) | /* burst length */ (0 << 15) | /* 0 = falling edge */ (0 << 13) | /* 0 = basic I2S format */ (0 << 12) | /* 0 = MSB first */ (0 << 11) | /* 0 = left channel for low polarity */ (3 << 8) | /* MCLK divider */ (0 << 5) | /* 0 = 16-bit */ (0 << 3) | /* bit clock per frame */ (1 << 0); /* channel index */ #endif /* S3: DMA channel 0 on */ clean_dcache(); if (size >= 4096) { dblbufsize = (size >> 4) & ~3; size = size - dblbufsize; dblbuf = addr + size; dmamode = 0; } else dmamode = 1; bootstrap_fiq(addr, (size >> 1) - 1); /* S4: IIS Tx clock on */ I2SCLKCON = (1 << 0); /* 1 = power on */ /* S5: IIS Tx on */ I2STXCOM = (1 << 3) | /* 1 = transmit mode on */ (1 << 2) | /* 1 = I2S interface enable */ (1 << 1) | /* 1 = DMA request enable */ (0 << 0); /* 0 = LRCK on */ } void pcm_play_dma_stop(void) { /* DMA channel off */ DMACOM0 = 5; /* TODO Some time wait */ /* LRCK half cycle wait */ /* IIS Tx off */ I2STXCOM = (1 << 3) | /* 1 = transmit mode on */ (0 << 2) | /* 1 = I2S interface enable */ (1 << 1) | /* 1 = DMA request enable */ (0 << 0); /* 0 = LRCK on */ } /* pause playback by disabling the I2S interface */ void pcm_play_dma_pause(bool pause) { if (pause) { I2STXCOM |= (1 << 0); /* LRCK off */ } else { I2STXCOM &= ~(1 << 0); /* LRCK on */ } } void pcm_play_dma_init(void) { /* configure IIS pins */ #ifdef IPOD_NANO2G PCON5 = (PCON5 & ~(0xFFFF0000)) | 0x22220000; PCON6 = (PCON6 & ~(0x0F000000)) | 0x02000000; #else PCON7 = (PCON7 & ~(0x0FFFFF00)) | 0x02222200; #endif /* enable clock to the IIS module */ PWRCON &= ~(1 << 6); /* Enable the DMA FIQ */ INTMOD |= (1 << 10); INTMSK |= (1 << 10); audiohw_preinit(); } void pcm_postinit(void) { audiohw_postinit(); } /* set the configured PCM frequency */ void pcm_dma_apply_settings(void) { // audiohw_set_frequency(pcm_sampr); struct div_entry div = div_table[pcm_fsel]; PLLCON &= ~4; PLLCON &= ~0x10; PLLCON &= 0x3f; PLLCON |= 4; /* configure PLL1 and MCLK for the desired sample rate */ PLL1PMS = (div.pdiv << 16) | (div.mdiv << 8) | (div.sdiv << 0); PLL1LCNT = 7500; /* no idea what to put here */ /* enable PLL1 and wait for lock */ PLLCON |= (1 << 1); while ((PLLLOCK & (1 << 1)) == 0); /* configure MCLK */ CLKCON = (CLKCON & ~(0xFF)) | (0 << 7) | /* MCLK_MASK */ (2 << 5) | /* MCLK_SEL = PLL1 */ (1 << 4) | /* MCLK_DIV_ON */ (div.cdiv - 1); /* MCLK_DIV_VAL */ } size_t pcm_get_bytes_waiting(void) { return (nextsize + DMACTCNT0 + 2) << 1; } const void * pcm_play_dma_get_peak_buffer(int *count) { *count = DMACTCNT0 >> 1; return (void *)(((DMACADDR0 + 2) & ~3) | 0x40000000); } #ifdef HAVE_PCM_DMA_ADDRESS void * pcm_dma_addr(void *addr) { if (addr != NULL) addr = (void*)((uintptr_t)addr | 0x40000000); return addr; } #endif /**************************************************************************** ** Recording DMA transfer **/ #ifdef HAVE_RECORDING void pcm_rec_lock(void) { } void pcm_rec_unlock(void) { } void pcm_rec_dma_stop(void) { } void pcm_rec_dma_start(void *addr, size_t size) { (void)addr; (void)size; } void pcm_rec_dma_close(void) { } void pcm_rec_dma_init(void) { } const void * pcm_rec_dma_get_peak_buffer(void) { return NULL; } #endif /* HAVE_RECORDING */