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fusee: sdmmc: handle DMA page boundaries

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This commit is contained in:
Kate J. Temkin 2018-04-28 09:39:04 -06:00
parent 534c50fba5
commit 21c177804e
1 changed files with 18 additions and 1 deletions
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19
fusee/fusee-primary/src/sdmmc.c
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@ -164,6 +164,7 @@ enum sdmmc_register_bits {
/* Interrupt status */
MMC_STATUS_COMMAND_COMPLETE = (1 << 0),
MMC_STATUS_TRANSFER_COMPLETE = (1 << 1),
MMC_STATUS_DMA_INTERRUPT = (1 << 3),
MMC_STATUS_COMMAND_TIMEOUT = (1 << 16),
MMC_STATUS_COMMAND_CRC_ERROR = (1 << 17),
MMC_STATUS_COMMAND_END_BIT_ERROR = (1 << 18),
@ -671,6 +672,22 @@ static int sdmmc_wait_for_transfer_completion(struct mmc *mmc)
if (mmc->regs->int_status & MMC_STATUS_TRANSFER_COMPLETE)
return 0;
// Automatically traverse DMA page boundaries.
if (mmc->regs->int_status & MMC_STATUS_DMA_INTERRUPT) {
// The SDMMC SDMA architecture is designed to pause at page
// boundaries to allow for CPU-assisted scatter gather. We don't
// use the scatter-gather feature, but we do need to "unpause"
// by telling it the next DMA address.
//
// Since we're always continuing as is, we'll read the current
// DMA address, clear the DMA interrupt, and then write the DMA
// address back. This is our "unpause".
uint32_t address = mmc->regs->dma_address;
mmc->regs->int_status |= MMC_STATUS_DMA_INTERRUPT;
mmc->regs->dma_address = address;
}
// If an error occurs, return it.
if (mmc->regs->int_status & MMC_STATUS_ERROR_MASK)
return (mmc->regs->int_status & MMC_STATUS_ERROR_MASK) >> 16;
@ -760,7 +777,7 @@ static void sdmmc_enable_interrupts(struct mmc *mmc, bool enabled)
// Get an mask that represents all interrupts.
uint32_t all_interrupts =
MMC_STATUS_COMMAND_COMPLETE | MMC_STATUS_TRANSFER_COMPLETE |
MMC_STATUS_ERROR_MASK;
MMC_STATUS_DMA_INTERRUPT | MMC_STATUS_ERROR_MASK;
// Clear any pending interrupts.
mmc->regs->int_status |= all_interrupts;