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fusee: allow sdmmc_read / sdmmc_write of more data than fits in the bounce buffer

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This commit is contained in:
Kate J. Temkin 2018-05-11 11:27:35 -07:00
parent 912590b2fd
commit 2b871397c2
2 changed files with 74 additions and 20 deletions
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91
fusee/fusee-primary/src/sdmmc.c
View file

@ -155,9 +155,13 @@ enum sdmmc_register_bits {
MMC_DAT0_LINE_STATE = (1 << 20),
/* Block size register */
MMC_DMA_BOUNDARY_MAXIMUM = (0x3 << 12),
MMC_DMA_BOUNDARY_512K = (0x3 << 12),
MMC_DMA_BOUNDARY_MAXIMUM = (0x7 << 12),
MMC_DMA_BOUNDARY_512K = (0x7 << 12),
MMC_DMA_BOUNDARY_64K = (0x4 << 12),
MMC_DMA_BOUNDARY_32K = (0x3 << 12),
MMC_DMA_BOUNDARY_16K = (0x2 << 12),
MMC_DMA_BOUNDARY_8K = (0x1 << 12),
MMC_DMA_BOUNDARY_4K = (0x0 << 12),
MMC_TRANSFER_BLOCK_512B = (0x200 << 0),
/* Command register */
@ -396,6 +400,9 @@ struct PACKED sdmmc_scr {
uint8_t scr_version : 4;
};
/* Callback function typedefs */
typedef int (*fault_handler_t)(struct mmc *mmc);
/* Forward declarations */
static int sdmmc_send_simple_command(struct mmc *mmc, enum sdmmc_command command,
enum sdmmc_response_type response_type, uint32_t argument, void *response_buffer);
@ -407,8 +414,8 @@ static int sdmmc_loglevel = 0;
* Page-aligned bounce buffer to target with SDMMC DMA.
* If the size of this buffer is changed, the block_size
*/
static uint8_t ALIGN(4096) sdmmc_bounce_buffer[4096 * 4];
static const uint16_t sdmmc_bounce_dma_boundary = MMC_DMA_BOUNDARY_16K;
static uint8_t ALIGN(4096) sdmmc_bounce_buffer[1024 * 8];
static const uint16_t sdmmc_bounce_dma_boundary = MMC_DMA_BOUNDARY_8K;
/**
@ -1081,6 +1088,31 @@ static int sdmmc_wait_until_no_longer_busy(struct mmc *mmc)
return sdmmc_wait_for_physical_state(mmc, MMC_DAT0_LINE_STATE, false);
}
/**
* Handles an event in which the given SDMMC controller's DMA buffers have
* become full, and must be emptied again before they can be used.
*
* @param mmc The MMC controller that has suffered a full buffer.
*/
static int sdmmc_handle_full_dma_buffers(struct mmc *mmc)
{
// Determine the total amount copied by subtracting the current pointer from
// its starting address-- effectively by figuring out how far we got in the bounce buffer.
uint32_t total_copied = mmc->regs->dma_address - (uint32_t)sdmmc_bounce_buffer;
// If we have a DMA buffer we're copying to, empty it out.
if (mmc->active_data_buffer) {
// Copy the data to the user buffer, and advance in the user buffer
// by the amount coppied.
memcpy((void *)mmc->active_data_buffer, sdmmc_bounce_buffer, total_copied);
mmc->active_data_buffer += total_copied;
}
// Reset the DMA to point at the beginning of our bounce buffer for another interation.
mmc->regs->dma_address = (uint32_t)sdmmc_bounce_buffer;
return 0;
}
/**
* Blocks until the SD driver has completed issuing a command.
@ -1089,23 +1121,43 @@ static int sdmmc_wait_until_no_longer_busy(struct mmc *mmc)
* @param target_irq A bitmask that specifies the bits that
* will make this function return success
* @param fault_conditions A bitmask that specifies the bits that
* will make this function return EFAULT.
* will make this function trigger its fault handler.
* @param fault_handler A function that's called to handle DMA faults.
* If it returns nonzero, this method will abort immediately; if it
* returns zero, it'll clear the error and continue.
*
* @return 0 on sucess, EFAULT if a fault condition occurs,
* or an error code if a transfer failure occurs
*/
static int sdmmc_wait_for_interrupt(struct mmc *mmc,
uint32_t target_irq, uint32_t fault_conditions)
uint32_t target_irq, uint32_t fault_conditions, fault_handler_t fault_handler)
{
uint32_t timebase = get_time();
int rc;
// Wait until we either wind up ready, or until we've timed out.
while (true) {
if (get_time_since(timebase) > mmc->timeout)
return ETIMEDOUT;
if (mmc->regs->int_status & fault_conditions)
return EFAULT;
if (mmc->regs->int_status & fault_conditions) {
// If we don't have a handler, fault.
if (!fault_handler) {
mmc_print(mmc, "ERROR: unhandled DMA fault!\n");
return EFAULT;
}
// Call the DMA fault handler.
rc = fault_handler(mmc);
if (rc) {
mmc_print(mmc, "ERROR: unhandled DMA fault!\n (%d)", rc);
return rc;
}
// Finally, EOI the relevant interrupt.
mmc->regs->int_status |= fault_conditions;
}
if (mmc->regs->int_status & target_irq)
return 0;
@ -1123,10 +1175,11 @@ static int sdmmc_wait_for_interrupt(struct mmc *mmc,
*/
static int sdmmc_wait_for_command_completion(struct mmc *mmc)
{
return sdmmc_wait_for_interrupt(mmc, MMC_STATUS_COMMAND_COMPLETE, 0);
return sdmmc_wait_for_interrupt(mmc, MMC_STATUS_COMMAND_COMPLETE, 0, NULL);
}
/**
* Blocks until the SD driver has completed issuing a command.
*
@ -1134,7 +1187,8 @@ static int sdmmc_wait_for_command_completion(struct mmc *mmc)
*/
static int sdmmc_wait_for_transfer_completion(struct mmc *mmc)
{
return sdmmc_wait_for_interrupt(mmc, MMC_STATUS_TRANSFER_COMPLETE, MMC_STATUS_DMA_INTERRUPT);
return sdmmc_wait_for_interrupt(mmc, MMC_STATUS_TRANSFER_COMPLETE,
MMC_STATUS_DMA_INTERRUPT, sdmmc_handle_full_dma_buffers);
}
@ -1441,16 +1495,13 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
uint32_t total_data_to_xfer = sdmmc_get_block_size(mmc, is_write) * blocks_to_transfer;
int rc;
// If this transfer would have us send more than we can, fail out.
if (total_data_to_xfer > sizeof(sdmmc_bounce_buffer)) {
mmc_print(mmc, "ERROR: transfer is larger than our maximum DMA transfer size!");
return -E2BIG;
}
// Store user data buffer for use by future DMA operations.
mmc->active_data_buffer = (uint32_t)data_buffer;
// Sanity check: if this is a data transfer, make sure we have a data buffer...
if (blocks_to_transfer && !data_buffer) {
mmc_print(mmc, "ERROR: no data buffer provided, but this is a data transfer!");
return -EINVAL;
mmc_print(mmc, "WARNING: no data buffer provided, but this is a data transfer!");
mmc_print(mmc, "this does nothing; but is supported for debug");
}
// Wait until we can issue commands to the device.
@ -1474,7 +1525,7 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
// If this is a write and we have data, we'll need to populate the bounce buffer before
// issuing the command.
if (blocks_to_transfer && is_write && mmc->use_dma) {
if (blocks_to_transfer && is_write && mmc->use_dma && data_buffer) {
memcpy(sdmmc_bounce_buffer, data_buffer, total_data_to_xfer);
}
@ -1517,7 +1568,7 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
// If this is a read, and we've just finished a transfer, copy the data from
// our bounce buffer to the target data buffer.
if (!is_write) {
if (!is_write && data_buffer) {
memcpy(data_buffer, sdmmc_bounce_buffer, total_data_to_xfer);
}
}
@ -1913,7 +1964,7 @@ static int sdmmc_optimize_transfer_mode(struct mmc *mmc)
}
// TODO: step up into high speed modes
mmc_print(mmc, "now operating with a wider bus width");
return 0;
}

3
fusee/fusee-primary/src/sdmmc.h
View file

@ -171,6 +171,9 @@ struct mmc {
uint8_t write_block_order;
bool uses_block_addressing;
/* Current operation status flags */
uint32_t active_data_buffer;
/* Pointers to hardware structures */
volatile struct tegra_sdmmc *regs;
};