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rockbox/firmware/target/arm/pp/pcm-pp.c
Aidan MacDonald 58b2e45782 Fix unified syntax in ARM inline assembly 
GCC 4.9 always emits assembly with divided syntax. Setting unified
syntax in inline assembly causes the assembler to complain about
GCC's generated code, because the directive extends past the scope
of the inline asm. Fix this by setting divided mode at the end of
the inline assembly block.

The assembler directives are hidden behind macros because later
versions of GCC won't need this workaround: they can be told to
use the unified syntax with -masm-syntax-unified.

Change-Id: Ic09e729e5bbb6fd44d08dac348daf6f55c75d7d8
2023-03-23 18:16:33 +00:00

710 lines
21 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Michael Sevakis
*
* 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 <stdlib.h>
#include "system.h"
#include "kernel.h"
#include "logf.h"
#include "audio.h"
#include "sound.h"
#include "pcm.h"
#include "pcm_sampr.h"
#include "pcm-internal.h"
/** DMA **/
struct dma_data
{
/* NOTE: The order of size and p is important if you use assembler
optimised fiq handler, so don't change it. */
union
{
unsigned long addr;
const void *p_r;
void *p_w;
uint32_t *p16; /* For packed 16-16 stereo pairs */
uint16_t *p32; /* For individual samples converted to 32-bit */
};
size_t size;
#if NUM_CORES > 1
unsigned core;
#endif
int locked;
int state;
};
extern void *fiq_function;
/* Dispatch to the proper handler and leave the main vector table alone */
void fiq_handler(void) ICODE_ATTR __attribute__((naked));
void fiq_handler(void)
{
asm volatile (
"ldr pc, [pc, #-4] \n"
"fiq_function: \n"
".word 0 \n"
);
}
#ifdef HAVE_PCM_DMA_ADDRESS
void * pcm_dma_addr(void *addr)
{
if (addr != NULL && (unsigned long)addr < UNCACHED_BASE_ADDR)
addr = UNCACHED_ADDR(addr);
return addr;
}
#endif
/* TODO: Get simultaneous recording and playback to work. Just needs some tweaking */
/****************************************************************************
** Playback DMA transfer
**/
static struct dma_data dma_play_data IBSS_ATTR =
{
/* Initialize to a locked, stopped state */
{ .addr = 0 },
.size = 0,
#if NUM_CORES > 1
.core = 0x00,
#endif
.locked = 0,
.state = 0
};
void pcm_dma_apply_settings(void)
{
audiohw_set_frequency(pcm_fsel);
}
#if defined(CPU_PP502x)
/* 16-bit, L-R packed into 32 bits with left in the least significant halfword */
#define SAMPLE_SIZE 16
/* DMA Requests from IIS, Memory to peripheral, single transfer,
wait for DMA request, interrupt on complete */
#define DMA_PLAY_CONFIG ((DMA_REQ_IIS << DMA_CMD_REQ_ID_POS) | \
DMA_CMD_RAM_TO_PER | DMA_CMD_SINGLE | \
DMA_CMD_WAIT_REQ | DMA_CMD_INTR)
/* DMA status cannot be viewed from outside code in control because that can
* clear the interrupt from outside the handler and prevent the handler from
* from being called. Split up transfers to a reasonable size that is good as
* a timer and peaking yet still keeps the FIQ count low.
*/
#define MAX_DMA_CHUNK_SIZE (pcm_curr_sampr >> 6) /* ~1/256 seconds */
static inline void dma_tx_init(void)
{
/* Enable DMA controller */
DMA_MASTER_CONTROL |= DMA_MASTER_CONTROL_EN;
/* FIQ priority for DMA */
CPU_INT_PRIORITY |= DMA_MASK;
/* Enable request?? Not setting or clearing everything doesn't seem to
* prevent it operating. Perhaps important for reliability (how requests
* are handled). */
DMA_REQ_STATUS |= 1ul << DMA_REQ_IIS;
DMA0_STATUS;
}
static inline void dma_tx_setup(void)
{
/* Setup DMA controller */
DMA0_PER_ADDR = (unsigned long)&IISFIFO_WR;
DMA0_FLAGS = DMA_FLAGS_UNK26;
DMA0_INCR = DMA_INCR_RANGE_FIXED | DMA_INCR_WIDTH_32BIT;
}
static inline unsigned long dma_tx_buf_prepare(const void *addr)
{
unsigned long a = (unsigned long)addr;
if (a < UNCACHED_BASE_ADDR) {
/* VA in DRAM - writeback all data and get PA */
a = UNCACHED_ADDR(a);
commit_dcache();
}
return a;
}
static inline void dma_tx_start(bool begin)
{
size_t size = MAX_DMA_CHUNK_SIZE;
/* Not at least MAX_DMA_CHUNK_SIZE left or there would be less
* than a FIFO's worth of data after this transfer? */
if (size + 16*4 > dma_play_data.size)
size = dma_play_data.size;
/* Set the new DMA values and activate channel */
DMA0_RAM_ADDR = dma_play_data.addr;
DMA0_CMD = DMA_PLAY_CONFIG | (size - 4) | DMA_CMD_START;
(void)begin;
}
static void dma_tx_stop(void)
{
unsigned long status = DMA0_STATUS; /* Snapshot- resume from this point */
unsigned long cmd = DMA0_CMD;
size_t size = 0;
/* Stop transfer */
DMA0_CMD = cmd & ~(DMA_CMD_START | DMA_CMD_INTR);
/* Wait for not busy + clear int */
while (DMA0_STATUS & (DMA_STATUS_BUSY | DMA_STATUS_INTR));
if (status & DMA_STATUS_BUSY) {
/* Transfer was interrupted - leave what's left */
size = (cmd & 0xfffc) - (status & 0xfffc);
}
else if (status & DMA_STATUS_INTR) {
/* Transfer was finished - DMA0_STATUS will have been reloaded
* automatically with size in DMA0_CMD. Setup to restart on next
* segment. */
size = (cmd & 0xfffc) + 4;
}
/* else not an active state - size = 0 */
dma_play_data.addr += size;
dma_play_data.size -= size;
if (dma_play_data.size == 0)
dma_play_data.addr = 0; /* Entire buffer has completed. */
}
static inline void dma_tx_lock(void)
{
CPU_INT_DIS = DMA_MASK;
}
static inline void dma_tx_unlock(void)
{
CPU_INT_EN = DMA_MASK;
}
/* NOTE: direct stack use forbidden by GCC stack handling bug for FIQ */
void fiq_playback(void) ICODE_ATTR __attribute__((interrupt("FIQ")));
void fiq_playback(void)
{
DMA0_STATUS; /* Clear any pending interrupt */
size_t size = (DMA0_CMD & 0xffff) + 4; /* Get size of trasfer that caused
this interrupt */
dma_play_data.addr += size;
dma_play_data.size -= size;
if (LIKELY(dma_play_data.size != 0)) {
/* Begin next segment */
dma_tx_start(false);
}
else if (pcm_play_dma_complete_callback(PCM_DMAST_OK, &dma_play_data.p_r,
&dma_play_data.size)) {
dma_play_data.addr = dma_tx_buf_prepare(dma_play_data.p_r);
dma_tx_start(false);
pcm_play_dma_status_callback(PCM_DMAST_STARTED);
}
}
#else /* !defined (CPU_PP502x) */
/* 32-bit, one left 32-bit sample followed by one right 32-bit sample */
#define SAMPLE_SIZE 32
static void dma_tx_init(void)
{
/* Set up banked registers for FIQ mode */
/* Use non-banked registers for scratch. */
register volatile void *iiscfg asm("r0") = &IISCONFIG;
register volatile void *dmapd asm("r1") = &dma_play_data;
asm volatile (
"mrs r2, cpsr \n" /* Save mode and interrupt status */
"msr cpsr_c, #0xd1 \n" /* Switch to FIQ mode */
"mov r8, #0 \n"
"mov r9, #0 \n"
"mov r10, %[iiscfg] \n"
"mov r11, %[dmapd] \n"
"msr cpsr_c, r2 \n"
:
: [iiscfg]"r"(iiscfg), [dmapd]"r"(dmapd)
: "r2");
/* FIQ priority for I2S */
CPU_INT_PRIORITY |= IIS_MASK;
CPU_INT_EN = IIS_MASK;
}
static inline void dma_tx_setup(void)
{
/* Nothing to do */
}
static inline unsigned long dma_tx_buf_prepare(const void *addr)
{
return (unsigned long)addr;
}
static inline void dma_tx_start(bool begin)
{
if (begin) {
IISCONFIG &= ~IIS_TXFIFOEN; /* Stop transmitting */
}
/* Fill the FIFO or start when data is used up */
while (IIS_TX_FREE_COUNT >= 2 && dma_play_data.size != 0) {
IISFIFO_WRH = *dma_play_data.p32++;
IISFIFO_WRH = *dma_play_data.p32++;
dma_play_data.size -= 4;
}
if (begin) {
IISCONFIG |= IIS_TXFIFOEN; /* Start transmitting */
}
}
static inline void dma_tx_stop(void)
{
/* Disable TX interrupt */
IIS_IRQTX_REG &= ~IIS_IRQTX;
}
static inline void dma_tx_lock(void)
{
IIS_IRQTX_REG &= ~IIS_IRQTX;
}
static inline void dma_tx_unlock(void)
{
IIS_IRQTX_REG |= IIS_IRQTX;
}
/* ASM optimised FIQ handler. Checks for the minimum allowed loop cycles by
* evalutation of free IISFIFO-slots against available source buffer words.
* Through this it is possible to move the check for IIS_TX_FREE_COUNT outside
* the loop and do some further optimization. Right after the loops (source
* buffer -> IISFIFO) are done we need to check whether we have to exit FIQ
* handler (this must be done, if all free FIFO slots were filled) or we will
* have to get some new source data. Important information kept from former
* ASM implementation (not used anymore): GCC fails to make use of the fact
* that FIQ mode has registers r8-r14 banked, and so does not need to be saved.
* This routine uses only these registers, and so will never touch the stack
* unless it actually needs to do so when calling pcm_play_dma_complete_callback.
* C version is still included below for reference and testing.
*/
#if 1
void fiq_playback(void) ICODE_ATTR __attribute__((naked));
void fiq_playback(void)
{
/* r8 and r9 contains local copies of p and size respectively.
* r10 contains IISCONFIG address (set during PCM init to minimize code in
* FIQ handler.Most other addresses we need are generated by using offsets
* from this.
* r10 + 0x40 is IISFIFO_WR, and r10 + 0x1c is IISFIFO_CFG.
* r11 contains address of dma_play_data
* r12 and r14 are working registers.
*
* Divided into two blocks: one where no external calls are needed and
* one where external callbacks are made
*/
asm volatile (
/* No external calls */
BEGIN_ARM_ASM_SYNTAX_UNIFIED
"sub lr, lr, #4 \n" /* Prepare return address */
"stmfd sp!, { lr } \n" /* stack lr so we can use it */
"ldr r12, =0xcf001040 \n" /* Some magic from iPodLinux ... */
"ldr r12, [r12] \n" /* ... actually a DMA INT ack? */
"ldmia r11, { r8-r9 } \n" /* r8 = p, r9 = size */
"cmp r9, #0 \n" /* is size 0? */
"beq 1f \n" /* if so, ask PCM for more data */
"ldr r14, [r10, #0x1c] \n" /* read IISFIFO_CFG to check FIFO status */
"and r14, r14, #(0xe<<23) \n" /* r14 = (IIS_TX_FREE_COUNT & ~1) << 23 */
"cmp r9, r14, lsr #22 \n" /* number of words from source */
"movlo r14, r9, lsl #22 \n" /* r14 = amount of allowed loops */
"sub r9, r9, r14, lsr #22 \n" /* r14 words will be written in loop */
"0: \n"
"ldr r12, [r8], #4 \n" /* load left-right pair */
"subs r14, r14, #(0x2<<23) \n" /* one more loop? ... */
"strh r12, [r10, #0x40] \n" /* left sample to IISFIFO_WR */
"mov r12, r12, lsr #16 \n" /* put right sample in bottom 16 bits */
"strh r12, [r10, #0x40] \n" /* right sample to IISFIFO_WR */
"bhi 0b \n" /* ... yes, continue */
"cmp r9, #0 \n" /* either FIFO full or size empty? */
"stmiane r11, { r8-r9 } \n" /* save p and size, if not empty */
"ldmfdne sp!, { pc }^ \n" /* RFE if not empty */
/* Making external calls */
"1: \n"
"stmfd sp!, { r0-r3 } \n" /* Must save volatiles */
"2: \n"
"mov r0, %0 \n" /* r0 = status */
"mov r1, r11 \n" /* r1 = &dma_play_data.p_r */
"add r2, r11, #4 \n" /* r2 = &dma_play_data.size */
"ldr r3, =pcm_play_dma_complete_callback \n"
"mov lr, pc \n" /* long call (not in same section) */
"bx r3 \n"
"cmp r0, #0 \n" /* more data? */
"ldmfdeq sp!, { r0-r3, pc }^ \n" /* no? -> exit */
"ldr r14, [r10, #0x1c] \n" /* read IISFIFO_CFG to check FIFO status */
"ands r14, r14, #(0xe<<23) \n" /* r14 = (IIS_TX_FREE_COUNT & ~1) << 23 */
"bne 4f \n"
"3: \n" /* inform of started status if registered */
"ldr r1, =pcm_play_status_callback \n"
"ldr r1, [r1] \n"
"cmp r1, #0 \n"
"movne r0, %1 \n"
"movne lr, pc \n"
"bxne r1 \n"
"ldmfd sp!, { r0-r3, pc }^ \n" /* exit */
"4: \n"
"ldmia r11, { r8-r9 } \n" /* load new p and size */
"cmp r9, r14, lsr #22 \n" /* number of words from source */
"movlo r14, r9, lsl #22 \n" /* r14 = amount of allowed loops */
"sub r9, r9, r14, lsr #22 \n" /* r14 words will be written in loop */
"0: \n"
"ldr r12, [r8], #4 \n" /* load left-right pair */
"subs r14, r14, #(0x2<<23) \n" /* one more loop? ... */
"strh r12, [r10, #0x40] \n" /* left sample to IISFIFO_WR */
"mov r12, r12, lsr #16 \n" /* put right sample in bottom 16 bits */
"strh r12, [r10, #0x40] \n" /* right sample to IISFIFO_WR */
"bhi 0b \n" /* ... yes, continue */
"stmia r11, { r8-r9 } \n" /* save p and size */
"cmp r9, #0 \n" /* used up data in FIFO fill? */
"bne 3b \n" /* no? -> go return */
"b 2b \n" /* yes -> get even more */
".ltorg \n"
END_ARM_ASM_SYNTAX_UNIFIED
: /* These must only be integers! No regs */
: "i"(PCM_DMAST_OK), "i"(PCM_DMAST_STARTED));
}
#else /* C version for reference */
/* NOTE: direct stack use forbidden by GCC stack handling bug for FIQ */
void fiq_playback(void) ICODE_ATTR __attribute__((interrupt ("FIQ")));
void fiq_playback(void)
{
inl(0xcf001040);
if (LIKELY(dma_play_data.size != 0)) {
dma_tx_start(false);
if (dma_play_data.size != 0) {
/* Still more data */
return;
}
}
while (pcm_play_dma_complete_callback(PCM_DMAST_OK, &dma_play_data.p_r,
&dma_play_data.size)) {
dma_tx_start(false);
pcm_play_dma_status_callback(PCM_DMAST_STARTED);
if (dma_play_data.size != 0) {
return;
}
}
}
#endif /* ASM / C selection */
#endif /* CPU_PP502x */
/* For the locks, FIQ must be disabled because the handler manipulates
IISCONFIG and the operation is not atomic - dual core support
will require other measures */
void pcm_play_lock(void)
{
int status = disable_fiq_save();
if (++dma_play_data.locked == 1) {
dma_tx_lock();
}
restore_fiq(status);
}
void pcm_play_unlock(void)
{
int status = disable_fiq_save();
if (--dma_play_data.locked == 0 && dma_play_data.state != 0) {
dma_tx_unlock();
}
restore_fiq(status);
}
static void play_start_pcm(void)
{
fiq_function = fiq_playback;
dma_play_data.state = 1;
dma_tx_start(true);
}
static void play_stop_pcm(void)
{
dma_tx_stop();
/* Wait for FIFO to empty */
while (!IIS_TX_IS_EMPTY);
dma_play_data.state = 0;
}
void pcm_play_dma_start(const void *addr, size_t size)
{
pcm_play_dma_stop();
#if NUM_CORES > 1
/* This will become more important later - and different ! */
dma_play_data.core = processor_id(); /* save initiating core */
#endif
dma_tx_setup();
dma_play_data.addr = dma_tx_buf_prepare(addr);
dma_play_data.size = size;
play_start_pcm();
}
/* Stops the DMA transfer and interrupt */
void pcm_play_dma_stop(void)
{
play_stop_pcm();
dma_play_data.addr = 0;
dma_play_data.size = 0;
#if NUM_CORES > 1
dma_play_data.core = 0; /* no core in control */
#endif
}
void pcm_play_dma_init(void)
{
/* Initialize default register values. */
audiohw_init();
dma_tx_init();
IISCONFIG |= IIS_TXFIFOEN;
}
void pcm_play_dma_postinit(void)
{
audiohw_postinit();
}
/****************************************************************************
** Recording DMA transfer
**/
#ifdef HAVE_RECORDING
/* PCM recording interrupt routine lockout */
static struct dma_data dma_rec_data IBSS_ATTR =
{
/* Initialize to a locked, stopped state */
{ .addr = 0 },
.size = 0,
#if NUM_CORES > 1
.core = 0x00,
#endif
.locked = 0,
.state = 0
};
/* For the locks, FIQ must be disabled because the handler manipulates
IISCONFIG and the operation is not atomic - dual core support
will require other measures */
void pcm_rec_lock(void)
{
int status = disable_fiq_save();
if (++dma_rec_data.locked == 1)
IIS_IRQRX_REG &= ~IIS_IRQRX;
restore_fiq(status);
}
void pcm_rec_unlock(void)
{
int status = disable_fiq_save();
if (--dma_rec_data.locked == 0 && dma_rec_data.state != 0)
IIS_IRQRX_REG |= IIS_IRQRX;
restore_fiq(status);
}
/* NOTE: direct stack use forbidden by GCC stack handling bug for FIQ */
void fiq_record(void) ICODE_ATTR __attribute__((interrupt ("FIQ")));
#if defined(SANSA_C200) || defined(SANSA_E200)
void fiq_record(void)
{
register int32_t value;
if (audio_channels == 2) {
/* RX is stereo */
while (dma_rec_data.size > 0) {
if (IIS_RX_FULL_COUNT < 2) {
return;
}
/* Discard every other sample since ADC clock is 1/2 LRCK */
value = IISFIFO_RD;
IISFIFO_RD;
*dma_rec_data.p16++ = value;
dma_rec_data.size -= 4;
/* TODO: Figure out how to do IIS loopback */
if (audio_output_source != AUDIO_SRC_PLAYBACK) {
if (IIS_TX_FREE_COUNT >= 16) {
/* Resync the output FIFO - it ran dry */
IISFIFO_WR = 0;
IISFIFO_WR = 0;
}
IISFIFO_WR = value;
IISFIFO_WR = value;
}
}
}
else {
/* RX is left channel mono */
while (dma_rec_data.size > 0) {
if (IIS_RX_FULL_COUNT < 2) {
return;
}
/* Discard every other sample since ADC clock is 1/2 LRCK */
value = IISFIFO_RD;
IISFIFO_RD;
value = (uint16_t)value | (value << 16);
*dma_rec_data.p16++ = value;
dma_rec_data.size -= 4;
if (audio_output_source != AUDIO_SRC_PLAYBACK) {
if (IIS_TX_FREE_COUNT >= 16) {
/* Resync the output FIFO - it ran dry */
IISFIFO_WR = 0;
IISFIFO_WR = 0;
}
value = *((int32_t *)dma_rec_data.p16 - 1);
IISFIFO_WR = value;
IISFIFO_WR = value;
}
}
}
if (pcm_rec_dma_complete_callback(PCM_DMAST_OK, &dma_rec_data.p_w,
&dma_rec_data.size))
{
pcm_rec_dma_status_callback(PCM_DMAST_STARTED);
}
}
#else /* !(SANSA_C200 || SANSA_E200) */
void fiq_record(void)
{
while (dma_rec_data.size > 0) {
if (IIS_RX_FULL_COUNT < 2) {
return;
}
#if SAMPLE_SIZE == 16
*dma_rec_data.p16++ = IISFIFO_RD;
#elif SAMPLE_SIZE == 32
*dma_rec_data.p32++ = IISFIFO_RDH;
*dma_rec_data.p32++ = IISFIFO_RDH;
#endif
dma_rec_data.size -= 4;
}
if (pcm_rec_dma_complete_callback(PCM_DMAST_OK, &dma_rec_data.p_w,
&dma_rec_data.size))
{
pcm_rec_dma_status_callback(PCM_DMAST_STARTED);
}
}
#endif /* SANSA_C200 || SANSA_E200 */
void pcm_rec_dma_stop(void)
{
/* disable interrupt */
IIS_IRQRX_REG &= ~IIS_IRQRX;
dma_rec_data.state = 0;
dma_rec_data.size = 0;
#if NUM_CORES > 1
dma_rec_data.core = 0x00;
#endif
/* disable fifo */
IISCONFIG &= ~IIS_RXFIFOEN;
IISFIFO_CFG |= IIS_RXCLR;
}
void pcm_rec_dma_start(void *addr, size_t size)
{
pcm_rec_dma_stop();
dma_rec_data.addr = (unsigned long)addr;
dma_rec_data.size = size;
#if NUM_CORES > 1
/* This will become more important later - and different ! */
dma_rec_data.core = processor_id(); /* save initiating core */
#endif
/* setup FIQ handler */
fiq_function = fiq_record;
/* interrupt on full fifo, enable record fifo interrupt */
dma_rec_data.state = 1;
/* enable RX FIFO */
IISCONFIG |= IIS_RXFIFOEN;
/* enable IIS interrupt as FIQ */
CPU_INT_PRIORITY |= IIS_MASK;
CPU_INT_EN = IIS_MASK;
}
void pcm_rec_dma_close(void)
{
pcm_rec_dma_stop();
} /* pcm_close_recording */
void pcm_rec_dma_init(void)
{
pcm_rec_dma_stop();
} /* pcm_init */
const void * pcm_rec_dma_get_peak_buffer(void)
{
return (void *)((unsigned long)dma_rec_data.addr & ~3);
} /* pcm_rec_dma_get_peak_buffer */
#endif /* HAVE_RECORDING */
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