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fusee: sdmmc: use v3 compatibility mode for it's simpler DMA

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we may want to change this at some point to get 64-bit addressing?
This commit is contained in:
Kate J. Temkin 2018-04-29 08:04:50 -06:00
parent ef1923ebab
commit 01e3761d4c
2 changed files with 9 additions and 35 deletions
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3
fusee/fusee-primary/Makefile
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@ -26,7 +26,8 @@ CFLAGS = \
-fdata-sections \
-std=gnu11 \
-Werror \
-Wall
-Wall \
-fstrict-volatile-bitfields
LDFLAGS = -specs=linker.specs -g $(ARCH)

41
fusee/fusee-primary/src/sdmmc.c
View file

@ -147,7 +147,7 @@ enum sdmmc_register_bits {
MMC_DMA_BOUNDARY_MAXIMUM = (0x3 << 12),
MMC_DMA_BOUNDARY_512K = (0x3 << 12),
MMC_DMA_BOUNDARY_16K = (0x2 << 12),
MMC_TRANSFER_BLOCK_512B = (0x1FF << 0),
MMC_TRANSFER_BLOCK_512B = (0x200 << 0),
/* Command register */
MMC_COMMAND_NUMBER_SHIFT = 8,
@ -465,18 +465,6 @@ static int sdmmc_hardware_init(struct mmc *mmc)
// Clear SDHCI_PROG_CLOCK_MODE
regs->clock_control &= ~(0x20);
// Set SDHCI_CTRL2_HOST_V4_ENABLE
regs->host_control2 |= 0x1000;
// SDHCI_CAN_64BIT must be set
if (!(regs->capabilities & 0x10000000)) {
mmc_print(mmc, "missing CAN_64bit capability");
return -1;
}
// Set SDHCI_CTRL2_64BIT_ENABLE
regs->host_control2 |= 0x2000;
// Clear SDHCI_CTRL_SDMA and SDHCI_CTRL_ADMA2
regs->host_control &= 0xE7;
@ -782,13 +770,15 @@ static int sdmmc_handle_cpu_transfer(struct mmc *mmc, uint16_t blocks, bool is_w
static void sdmmc_prepare_command_data(struct mmc *mmc, uint16_t blocks, bool is_write, int argument)
{
if (blocks) {
uint16_t block_size = sdmmc_get_block_size(mmc, is_write);
// If we're using DMA, target our bounce buffer.
if (mmc->use_dma)
mmc->regs->dma_address = (uint32_t)sdmmc_bounce_buffer;
// Set up the DMA block size and count.
// This is synchronized with the size of our bounce buffer.
mmc->regs->block_size = sdmmc_bounce_dma_boundary | MMC_TRANSFER_BLOCK_512B;
mmc->regs->block_size = sdmmc_bounce_dma_boundary | block_size;
mmc->regs->block_count = blocks;
}
@ -944,9 +934,6 @@ 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;
// XXX: get rid of
mmc_print(mmc, "issuing CMD%d", command);
// 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!");
@ -1034,18 +1021,6 @@ static int sdmmc_send_command(struct mmc *mmc, enum sdmmc_command command,
return rc;
}
}
// XXX: get rid of this
printk("read result (%d):\n", total_data_to_xfer);
for (int i = 0; i < 64; ++i) {
if(i % 8 == 0) {
printk("\n");
}
printk("%02x ", ((uint8_t *)data_buffer)[i]);
}
printk("\n");
}
// Disable resporting psuedo-interrupts.
@ -1303,7 +1278,7 @@ static int sdmmc_set_up_block_transfer_size(struct mmc *mmc)
*/
static int sdmmc_optimize_transfer_mode(struct mmc *mmc)
{
// TODO: FIXME
// FIXME: use this to setup higher data widths
return 0;
}
@ -1419,12 +1394,10 @@ int sdmmc_init(struct mmc *mmc, enum sdmmc_controller controller)
mmc->card_type = MMC_CARD_EMMC;
// Default to a timeout of 1S.
// FIXME: lower
// FIXME: abstract
mmc->timeout = 1000000;
// FIXME: make this configurable?
mmc->use_dma = false;
// Use DMA, by default.
mmc->use_dma = true;
// Default to relative address of zero.
mmc->relative_address = 0;