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crypto: omap-aes - PIO mode: Add IRQ handler and walk SGs

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We add an IRQ handler that implements a state-machine for PIO-mode and data
structures for walking the scatter-gather list. The IRQ handler is called in
succession both when data is available to read or next data can be sent for
processing. This process continues till the entire in/out SG lists have been
walked. Once the SG-list has been completely walked, the IRQ handler schedules
the done_task tasklet.

Also add a useful macro that is used through out the IRQ code for a common
pattern of calculating how much an SG list has been walked.  This improves code
readability and avoids checkpatch errors.

Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Joel Fernandes 2013-08-17 21:42:29 -05:00 committed by Herbert Xu
parent 67216756ea
commit 1bf95cca8f
1 changed files with 90 additions and 0 deletions
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90
drivers/crypto/omap-aes.c
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@ -40,6 +40,8 @@
#define DST_MAXBURST 4
#define DMA_MIN (DST_MAXBURST * sizeof(u32))
#define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
/* OMAP TRM gives bitfields as start:end, where start is the higher bit
number. For example 7:0 */
#define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end))
@ -92,6 +94,8 @@
#define FLAGS_FAST BIT(5)
#define FLAGS_BUSY BIT(6)
#define AES_BLOCK_WORDS (AES_BLOCK_SIZE >> 2)
struct omap_aes_ctx {
struct omap_aes_dev *dd;
@ -157,6 +161,8 @@ struct omap_aes_dev {
size_t total;
struct scatterlist *in_sg;
struct scatterlist *out_sg;
struct scatter_walk in_walk;
struct scatter_walk out_walk;
int dma_in;
struct dma_chan *dma_lch_in;
int dma_out;
@ -863,6 +869,90 @@ static const struct omap_aes_pdata omap_aes_pdata_omap4 = {
.minor_shift = 0,
};
static irqreturn_t omap_aes_irq(int irq, void *dev_id)
{
struct omap_aes_dev *dd = dev_id;
u32 status, i;
u32 *src, *dst;
status = omap_aes_read(dd, AES_REG_IRQ_STATUS(dd));
if (status & AES_REG_IRQ_DATA_IN) {
omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
BUG_ON(!dd->in_sg);
BUG_ON(_calc_walked(in) > dd->in_sg->length);
src = sg_virt(dd->in_sg) + _calc_walked(in);
for (i = 0; i < AES_BLOCK_WORDS; i++) {
omap_aes_write(dd, AES_REG_DATA_N(dd, i), *src);
scatterwalk_advance(&dd->in_walk, 4);
if (dd->in_sg->length == _calc_walked(in)) {
dd->in_sg = scatterwalk_sg_next(dd->in_sg);
if (dd->in_sg) {
scatterwalk_start(&dd->in_walk,
dd->in_sg);
src = sg_virt(dd->in_sg) +
_calc_walked(in);
}
} else {
src++;
}
}
/* Clear IRQ status */
status &= ~AES_REG_IRQ_DATA_IN;
omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
/* Enable DATA_OUT interrupt */
omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x4);
} else if (status & AES_REG_IRQ_DATA_OUT) {
omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x0);
BUG_ON(!dd->out_sg);
BUG_ON(_calc_walked(out) > dd->out_sg->length);
dst = sg_virt(dd->out_sg) + _calc_walked(out);
for (i = 0; i < AES_BLOCK_WORDS; i++) {
*dst = omap_aes_read(dd, AES_REG_DATA_N(dd, i));
scatterwalk_advance(&dd->out_walk, 4);
if (dd->out_sg->length == _calc_walked(out)) {
dd->out_sg = scatterwalk_sg_next(dd->out_sg);
if (dd->out_sg) {
scatterwalk_start(&dd->out_walk,
dd->out_sg);
dst = sg_virt(dd->out_sg) +
_calc_walked(out);
}
} else {
dst++;
}
}
dd->total -= AES_BLOCK_SIZE;
BUG_ON(dd->total < 0);
/* Clear IRQ status */
status &= ~AES_REG_IRQ_DATA_OUT;
omap_aes_write(dd, AES_REG_IRQ_STATUS(dd), status);
if (!dd->total)
/* All bytes read! */
tasklet_schedule(&dd->done_task);
else
/* Enable DATA_IN interrupt for next block */
omap_aes_write(dd, AES_REG_IRQ_ENABLE(dd), 0x2);
}
return IRQ_HANDLED;
}
static const struct of_device_id omap_aes_of_match[] = {
{
.compatible = "ti,omap2-aes",