diff options
Diffstat (limited to 'security/smc/omap4/scx_public_dma.c')
| -rw-r--r-- | security/smc/omap4/scx_public_dma.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/security/smc/omap4/scx_public_dma.c b/security/smc/omap4/scx_public_dma.c new file mode 100644 index 0000000..743c333 --- /dev/null +++ b/security/smc/omap4/scx_public_dma.c @@ -0,0 +1,137 @@ +/* + * Copyright (c) 2006-2010 Trusted Logic S.A. + * All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "scxlnx_defs.h" +#include "scxlnx_util.h" +#include "scx_public_dma.h" + +#include <asm/atomic.h> + +static atomic_t g_dmaEventFlag = ATOMIC_INIT(0); + +/*------------------------------------------------------------------------ */ +/* + * Internal functions + */ + +static void scxPublicDMACallback(int lch, u16 ch_status, void *data) +{ + atomic_inc(&g_dmaEventFlag); +} + +/*------------------------------------------------------------------------ */ +/* + * Public DMA API + */ + +u32 scxPublicDMARequest(int *lch) +{ + int dma_ch_out = 0; + + if (lch == NULL) + return PUBLIC_CRYPTO_ERR_BAD_PARAMETERS; + + if (omap_request_dma(0, "SMC Public Crypto", + scxPublicDMACallback, NULL, &dma_ch_out) != 0) + return PUBLIC_CRYPTO_ERR_OUT_OF_MEMORY; + + omap_disable_dma_irq(dma_ch_out, OMAP_DMA_DROP_IRQ | + OMAP_DMA_BLOCK_IRQ); + + *lch = dma_ch_out; + + return PUBLIC_CRYPTO_OPERATION_SUCCESS; +} + +/*------------------------------------------------------------------------ */ +/* + * Release a DMA channel + */ +u32 scxPublicDMARelease(int lch) +{ + omap_free_dma(lch); + + return PUBLIC_CRYPTO_OPERATION_SUCCESS; +} + +/*------------------------------------------------------------------------ */ + +void scxPublicDMASetParams(int lch, struct omap_dma_channel_params *pParams) +{ + omap_set_dma_params(lch, pParams); +} + +/*------------------------------------------------------------------------ */ + +void scxPublicDMAStart(int lch, int interruptMask) +{ + atomic_set(&g_dmaEventFlag, 0); + omap_enable_dma_irq(lch, interruptMask); + omap_start_dma(lch); +} + +/*------------------------------------------------------------------------ */ + +void scxPublicDMADisableChannel(int lch) +{ + omap_stop_dma(lch); +} + +/*------------------------------------------------------------------------ */ + +void scxPublicDMAClearChannel(int lch) +{ + omap_clear_dma(lch); +} + +/*------------------------------------------------------------------------ */ + +void scxPublicDMAWait(int nr_of_cb) +{ + while (atomic_read(&g_dmaEventFlag) < nr_of_cb) + cpu_relax(); +} + +/*------------------------------------------------------------------------ */ +/* + * Perform common DMA channel setup, used to factorize the code + * + * Output: struct omap_dma_channel_params *pDMAChannel + * Inputs: u32 nbBlocks Number of block of the transfer + * u32 nbElements Number of elements of the transfer + * u32 nDstStart Destination address + * u32 nSrcStart Source address + * u32 nTriggerID Trigger ID + */ +void scxPublicSetDMAChannelCommonParams( + struct omap_dma_channel_params *pDMAChannel, + u32 nbBlocks, u32 nbElements, + u32 nDstStart, u32 nSrcStart, u32 nTriggerID) +{ + pDMAChannel->data_type = OMAP_DMA_DATA_TYPE_S32; + pDMAChannel->elem_count = nbElements; + pDMAChannel->frame_count = nbBlocks; + pDMAChannel->src_ei = 0; + pDMAChannel->src_fi = 0; + pDMAChannel->dst_ei = 0; + pDMAChannel->dst_fi = 0; + pDMAChannel->sync_mode = OMAP_DMA_SYNC_FRAME; + pDMAChannel->src_start = nSrcStart; + pDMAChannel->dst_start = nDstStart; + pDMAChannel->trigger = nTriggerID; +} |