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Merge pull request #1489 from kasjer/kasjer/fix-nrf5x-dma-access

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nrf5x: Fix DMA access
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Ha Thach 2022-08-15 21:30:39 +07:00 committed by GitHub
commit 585f37a797
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1 changed files with 37 additions and 56 deletions
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93
src/portable/nordic/nrf5x/dcd_nrf5x.c
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@ -28,6 +28,7 @@
#if CFG_TUD_ENABLED && CFG_TUSB_MCU == OPT_MCU_NRF5X
#include <stdatomic.h>
#include "nrf.h"
#include "nrf_clock.h"
#include "nrf_power.h"
@ -72,6 +73,7 @@ typedef struct
// nRF will auto accept OUT packet after DMA is done
// indicate packet is already ACK
volatile bool data_received;
volatile bool started;
// Set to true when data was transferred from RAM to ISO IN output buffer.
// New data can be put in ISO IN output buffer after SOF.
@ -79,9 +81,6 @@ typedef struct
} xfer_td_t;
static osal_mutex_def_t dcd_mutex_def;
static osal_mutex_t dcd_mutex;
// Data for managing dcd
static struct
{
@ -90,7 +89,7 @@ static struct
xfer_td_t xfer[EP_CBI_COUNT + 1][2];
// nRF can only carry one DMA at a time, this is used to guard the access to EasyDMA
volatile bool dma_running;
atomic_bool dma_running;
}_dcd;
/*------------------------------------------------------------------*/
@ -121,8 +120,6 @@ TU_ATTR_ALWAYS_INLINE static inline bool is_in_isr(void)
// helper to start DMA
static void start_dma(volatile uint32_t* reg_startep)
{
_dcd.dma_running = true;
(*reg_startep) = 1;
__ISB(); __DSB();
@ -131,50 +128,18 @@ static void start_dma(volatile uint32_t* reg_startep)
// Therefore dma_pending is corrected right away
if ( (reg_startep == &NRF_USBD->TASKS_EP0STATUS) || (reg_startep == &NRF_USBD->TASKS_EP0RCVOUT) )
{
_dcd.dma_running = false;
atomic_flag_clear(&_dcd.dma_running);
}
}
// only 1 EasyDMA can be active at any time
// TODO use Cortex M4 LDREX and STREX command (atomic) to have better mutex access to EasyDMA
// since current implementation does not 100% guarded against race condition
static void edpt_dma_start(volatile uint32_t* reg_startep)
{
// Called in critical section i.e within USB ISR, or USB/Global interrupt disabled
if ( is_in_isr() || __get_PRIMASK() || !NVIC_GetEnableIRQ(USBD_IRQn) )
if ( atomic_flag_test_and_set(&_dcd.dma_running) )
{
if (_dcd.dma_running)
{
//use usbd task to defer later
usbd_defer_func((osal_task_func_t) edpt_dma_start, (void*) (uintptr_t) reg_startep, true);
}else
{
start_dma(reg_startep);
}
usbd_defer_func((osal_task_func_t) edpt_dma_start, (void*) (uintptr_t) reg_startep, true);
}else
{
// Called in non-critical thread-mode, should be 99% of the time.
// Should be safe to blocking wait until previous DMA transfer complete
uint8_t const rhport = 0;
bool started = false;
osal_mutex_lock(dcd_mutex, OSAL_TIMEOUT_WAIT_FOREVER);
while(!started)
{
// LDREX/STREX may be needed in form of std atomic (required C11) or
// use osal mutex to guard against multiple core MCUs such as nRF53
dcd_int_disable(rhport);
if ( !_dcd.dma_running )
{
start_dma(reg_startep);
started = true;
}
dcd_int_enable(rhport);
// osal_yield();
}
osal_mutex_unlock(dcd_mutex);
start_dma(reg_startep);
}
}
@ -182,7 +147,7 @@ static void edpt_dma_start(volatile uint32_t* reg_startep)
static void edpt_dma_end(void)
{
TU_ASSERT(_dcd.dma_running, );
_dcd.dma_running = false;
atomic_flag_clear(&_dcd.dma_running);
}
// helper getting td
@ -191,12 +156,26 @@ static inline xfer_td_t* get_td(uint8_t epnum, uint8_t dir)
return &_dcd.xfer[epnum][dir];
}
static void xact_out_dma(uint8_t epnum);
// Function wraps xact_out_dma which wants uint8_t while usbd_defer_func wants void (*)(void *)
static void xact_out_dma_wrapper(void *epnum)
{
xact_out_dma((uint8_t)((uintptr_t)epnum));
}
// Start DMA to move data from Endpoint -> RAM
static void xact_out_dma(uint8_t epnum)
{
xfer_td_t* xfer = get_td(epnum, TUSB_DIR_OUT);
uint32_t xact_len;
// DMA can't be active during read of SIZE.EPOUT or SIZE.ISOOUT, so try to lock,
// If already running deffer call regardless if it was called from ISR or task,
if ( atomic_flag_test_and_set(&_dcd.dma_running) )
{
usbd_defer_func((osal_task_func_t)xact_out_dma_wrapper, (void *)(uint32_t)epnum, is_in_isr());
return;
}
if (epnum == EP_ISO_NUM)
{
xact_len = NRF_USBD->SIZE.ISOOUT;
@ -204,6 +183,7 @@ static void xact_out_dma(uint8_t epnum)
if (xact_len & USBD_SIZE_ISOOUT_ZERO_Msk)
{
xact_len = 0;
atomic_flag_clear(&_dcd.dma_running);
}
else
{
@ -211,7 +191,7 @@ static void xact_out_dma(uint8_t epnum)
NRF_USBD->ISOOUT.PTR = (uint32_t) xfer->buffer;
NRF_USBD->ISOOUT.MAXCNT = xact_len;
edpt_dma_start(&NRF_USBD->TASKS_STARTISOOUT);
start_dma(&NRF_USBD->TASKS_STARTISOOUT);
}
}
else
@ -223,7 +203,7 @@ static void xact_out_dma(uint8_t epnum)
NRF_USBD->EPOUT[epnum].PTR = (uint32_t) xfer->buffer;
NRF_USBD->EPOUT[epnum].MAXCNT = xact_len;
edpt_dma_start(&NRF_USBD->TASKS_STARTEPOUT[epnum]);
start_dma(&NRF_USBD->TASKS_STARTEPOUT[epnum]);
}
}
@ -248,7 +228,6 @@ static void xact_in_dma(uint8_t epnum)
void dcd_init (uint8_t rhport)
{
TU_LOG1("dcd init\r\n");
dcd_mutex = osal_mutex_create(&dcd_mutex_def);
(void) rhport;
}
@ -471,17 +450,10 @@ bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t
xfer_td_t* xfer = get_td(epnum, dir);
if (!is_in_isr()) {
osal_mutex_lock(dcd_mutex, OSAL_TIMEOUT_WAIT_FOREVER);
dcd_int_disable(rhport);
}
TU_ASSERT(!xfer->started);
xfer->buffer = buffer;
xfer->total_len = total_bytes;
xfer->actual_len = 0;
if (!is_in_isr()) {
dcd_int_enable(rhport);
osal_mutex_unlock(dcd_mutex);
}
// Control endpoint with zero-length packet and opposite direction to 1st request byte --> status stage
bool const control_status = (epnum == 0 && total_bytes == 0 && dir != tu_edpt_dir(NRF_USBD->BMREQUESTTYPE));
@ -496,13 +468,20 @@ bool dcd_edpt_xfer (uint8_t rhport, uint8_t ep_addr, uint8_t * buffer, uint16_t
}
else if ( dir == TUSB_DIR_OUT )
{
xfer->started = true;
if ( epnum == 0 )
{
// Accept next Control Out packet. TASKS_EP0RCVOUT also require EasyDMA
edpt_dma_start(&NRF_USBD->TASKS_EP0RCVOUT);
}else
{
if ( xfer->data_received && xfer->total_len > xfer->actual_len)
// started just set, it could start DMA transfer if interrupt was trigger after this line
// code only needs to start transfer (from Endpoint to RAM) when data_received was set
// before started was set. If started is NOT set but data_received is, it means that
// current transfer was already finished and next data is already present in endpoint and
// can be consumed by future transfer
__ISB(); __DSB();
if ( xfer->data_received && xfer->started )
{
// Data is already received previously
// start DMA to copy to SRAM
@ -804,7 +783,9 @@ void dcd_int_handler(uint8_t rhport)
}
}else
{
TU_ASSERT(xfer->started,);
xfer->total_len = xfer->actual_len;
xfer->started = false;
// CBI OUT complete
dcd_event_xfer_complete(0, epnum, xfer->actual_len, XFER_RESULT_SUCCESS, true);
@ -857,7 +838,7 @@ void dcd_int_handler(uint8_t rhport)
{
xfer_td_t* xfer = get_td(epnum, TUSB_DIR_OUT);
if (xfer->actual_len < xfer->total_len)
if ( xfer->started && xfer->actual_len < xfer->total_len )
{
xact_out_dma(epnum);
}else