diff options
| -rw-r--r-- | drivers/crypto/omap-sham.c | 154 |
1 files changed, 145 insertions, 9 deletions
diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c index 9c3b096e15e..f54ceb8f5b2 100644 --- a/drivers/crypto/omap-sham.c +++ b/drivers/crypto/omap-sham.c @@ -13,6 +13,8 @@ * Some ideas are from old omap-sha1-md5.c driver. */ +#define OMAP_SHAM_DMA_PRIVATE + #define pr_fmt(fmt) "%s: " fmt, __func__ #include <linux/err.h> @@ -27,6 +29,8 @@ #include <linux/platform_device.h> #include <linux/scatterlist.h> #include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/omap-dma.h> #include <linux/pm_runtime.h> #include <linux/delay.h> #include <linux/crypto.h> @@ -37,15 +41,15 @@ #include <crypto/hash.h> #include <crypto/internal/hash.h> -#include <linux/omap-dma.h> -#include <mach/irqs.h> - #define SHA_REG_DIGEST(x) (0x00 + ((x) * 0x04)) #define SHA_REG_DIN(x) (0x1C + ((x) * 0x04)) #define SHA1_MD5_BLOCK_SIZE SHA1_BLOCK_SIZE #define MD5_DIGEST_SIZE 16 +#define DST_MAXBURST 16 +#define DMA_MIN (DST_MAXBURST * sizeof(u32)) + #define SHA_REG_DIGCNT 0x14 #define SHA_REG_CTRL 0x18 @@ -109,6 +113,9 @@ struct omap_sham_reqctx { /* walk state */ struct scatterlist *sg; +#ifndef OMAP_SHAM_DMA_PRIVATE + struct scatterlist sgl; +#endif unsigned int offset; /* offset in current sg */ unsigned int total; /* total request */ @@ -142,8 +149,12 @@ struct omap_sham_dev { int irq; spinlock_t lock; int err; +#ifdef OMAP_SHAM_DMA_PRIVATE int dma; int dma_lch; +#else + struct dma_chan *dma_lch; +#endif struct tasklet_struct done_task; unsigned long flags; @@ -313,15 +324,32 @@ static int omap_sham_xmit_cpu(struct omap_sham_dev *dd, const u8 *buf, return -EINPROGRESS; } +#ifndef OMAP_SHAM_DMA_PRIVATE +static void omap_sham_dma_callback(void *param) +{ + struct omap_sham_dev *dd = param; + + set_bit(FLAGS_DMA_READY, &dd->flags); + tasklet_schedule(&dd->done_task); +} +#endif + static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr, - size_t length, int final) + size_t length, int final, int is_sg) { struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); +#ifdef OMAP_SHAM_DMA_PRIVATE int len32; +#else + struct dma_async_tx_descriptor *tx; + struct dma_slave_config cfg; + int len32, ret; +#endif dev_dbg(dd->dev, "xmit_dma: digcnt: %d, length: %d, final: %d\n", ctx->digcnt, length, final); +#ifdef OMAP_SHAM_DMA_PRIVATE len32 = DIV_ROUND_UP(length, sizeof(u32)); omap_set_dma_transfer_params(dd->dma_lch, OMAP_DMA_DATA_TYPE_S32, len32, @@ -331,6 +359,50 @@ static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr, omap_set_dma_src_params(dd->dma_lch, 0, OMAP_DMA_AMODE_POST_INC, dma_addr, 0, 0); +#else + memset(&cfg, 0, sizeof(cfg)); + + cfg.dst_addr = dd->phys_base + SHA_REG_DIN(0); + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + cfg.dst_maxburst = DST_MAXBURST; + + ret = dmaengine_slave_config(dd->dma_lch, &cfg); + if (ret) { + pr_err("omap-sham: can't configure dmaengine slave: %d\n", ret); + return ret; + } + + len32 = DIV_ROUND_UP(length, DMA_MIN) * DMA_MIN; + + if (is_sg) { + /* + * The SG entry passed in may not have the 'length' member + * set correctly so use a local SG entry (sgl) with the + * proper value for 'length' instead. If this is not done, + * the dmaengine may try to DMA the incorrect amount of data. + */ + sg_init_table(&ctx->sgl, 1); + ctx->sgl.page_link = ctx->sg->page_link; + ctx->sgl.offset = ctx->sg->offset; + sg_dma_len(&ctx->sgl) = len32; + sg_dma_address(&ctx->sgl) = sg_dma_address(ctx->sg); + + tx = dmaengine_prep_slave_sg(dd->dma_lch, &ctx->sgl, 1, + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + } else { + tx = dmaengine_prep_slave_single(dd->dma_lch, dma_addr, len32, + DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + } + + if (!tx) { + dev_err(dd->dev, "prep_slave_sg/single() failed\n"); + return -EINVAL; + } + + tx->callback = omap_sham_dma_callback; + tx->callback_param = dd; +#endif + omap_sham_write_ctrl(dd, length, final, 1); ctx->digcnt += length; @@ -340,7 +412,12 @@ static int omap_sham_xmit_dma(struct omap_sham_dev *dd, dma_addr_t dma_addr, set_bit(FLAGS_DMA_ACTIVE, &dd->flags); +#ifdef OMAP_SHAM_DMA_PRIVATE omap_start_dma(dd->dma_lch); +#else + dmaengine_submit(tx); + dma_async_issue_pending(dd->dma_lch); +#endif return -EINPROGRESS; } @@ -387,6 +464,8 @@ static int omap_sham_xmit_dma_map(struct omap_sham_dev *dd, struct omap_sham_reqctx *ctx, size_t length, int final) { + int ret; + ctx->dma_addr = dma_map_single(dd->dev, ctx->buffer, ctx->buflen, DMA_TO_DEVICE); if (dma_mapping_error(dd->dev, ctx->dma_addr)) { @@ -396,8 +475,12 @@ static int omap_sham_xmit_dma_map(struct omap_sham_dev *dd, ctx->flags &= ~BIT(FLAGS_SG); - /* next call does not fail... so no unmap in the case of error */ - return omap_sham_xmit_dma(dd, ctx->dma_addr, length, final); + ret = omap_sham_xmit_dma(dd, ctx->dma_addr, length, final, 0); + if (ret) + dma_unmap_single(dd->dev, ctx->dma_addr, ctx->buflen, + DMA_TO_DEVICE); + + return ret; } static int omap_sham_update_dma_slow(struct omap_sham_dev *dd) @@ -432,6 +515,7 @@ static int omap_sham_update_dma_start(struct omap_sham_dev *dd) struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); unsigned int length, final, tail; struct scatterlist *sg; + int ret; if (!ctx->total) return 0; @@ -439,6 +523,17 @@ static int omap_sham_update_dma_start(struct omap_sham_dev *dd) if (ctx->bufcnt || ctx->offset) return omap_sham_update_dma_slow(dd); +#ifndef OMAP_SHAM_DMA_PRIVATE + /* + * Don't use the sg interface when the transfer size is less + * than the number of elements in a DMA frame. Otherwise, + * the dmaengine infrastructure will calculate that it needs + * to transfer 0 frames which ultimately fails. + */ + if (ctx->total < (DST_MAXBURST * sizeof(u32))) + return omap_sham_update_dma_slow(dd); +#endif + dev_dbg(dd->dev, "fast: digcnt: %d, bufcnt: %u, total: %u\n", ctx->digcnt, ctx->bufcnt, ctx->total); @@ -476,8 +571,11 @@ static int omap_sham_update_dma_start(struct omap_sham_dev *dd) final = (ctx->flags & BIT(FLAGS_FINUP)) && !ctx->total; - /* next call does not fail... so no unmap in the case of error */ - return omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, final); + ret = omap_sham_xmit_dma(dd, sg_dma_address(ctx->sg), length, final, 1); + if (ret) + dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE); + + return ret; } static int omap_sham_update_cpu(struct omap_sham_dev *dd) @@ -496,7 +594,12 @@ static int omap_sham_update_dma_stop(struct omap_sham_dev *dd) { struct omap_sham_reqctx *ctx = ahash_request_ctx(dd->req); +#ifdef OMAP_SHAM_DMA_PRIVATE omap_stop_dma(dd->dma_lch); +#else + dmaengine_terminate_all(dd->dma_lch); +#endif + if (ctx->flags & BIT(FLAGS_SG)) { dma_unmap_sg(dd->dev, ctx->sg, 1, DMA_TO_DEVICE); if (ctx->sg->length == ctx->offset) { @@ -583,7 +686,7 @@ static int omap_sham_final_req(struct omap_sham_dev *dd) struct omap_sham_reqctx *ctx = ahash_request_ctx(req); int err = 0, use_dma = 1; - if (ctx->bufcnt <= 64) + if (ctx->bufcnt <= DMA_MIN) /* faster to handle last block with cpu */ use_dma = 0; @@ -699,6 +802,7 @@ static int omap_sham_handle_queue(struct omap_sham_dev *dd, if (err) goto err1; +#ifdef OMAP_SHAM_DMA_PRIVATE omap_set_dma_dest_params(dd->dma_lch, 0, OMAP_DMA_AMODE_CONSTANT, dd->phys_base + SHA_REG_DIN(0), 0, 16); @@ -708,6 +812,7 @@ static int omap_sham_handle_queue(struct omap_sham_dev *dd, omap_set_dma_src_burst_mode(dd->dma_lch, OMAP_DMA_DATA_BURST_4); +#endif if (ctx->digcnt) /* request has changed - restore hash */ @@ -1099,6 +1204,7 @@ static irqreturn_t omap_sham_irq(int irq, void *dev_id) return IRQ_HANDLED; } +#ifdef OMAP_SHAM_DMA_PRIVATE static void omap_sham_dma_callback(int lch, u16 ch_status, void *data) { struct omap_sham_dev *dd = data; @@ -1136,12 +1242,17 @@ static void omap_sham_dma_cleanup(struct omap_sham_dev *dd) dd->dma_lch = -1; } } +#endif static int __devinit omap_sham_probe(struct platform_device *pdev) { struct omap_sham_dev *dd; struct device *dev = &pdev->dev; struct resource *res; +#ifndef OMAP_SHAM_DMA_PRIVATE + dma_cap_mask_t mask; + unsigned dma_chan; +#endif int err, i, j; dd = kzalloc(sizeof(struct omap_sham_dev), GFP_KERNEL); @@ -1176,7 +1287,11 @@ static int __devinit omap_sham_probe(struct platform_device *pdev) err = -ENODEV; goto res_err; } +#ifdef OMAP_SHAM_DMA_PRIVATE dd->dma = res->start; +#else + dma_chan = res->start; +#endif /* Get the IRQ */ dd->irq = platform_get_irq(pdev, 0); @@ -1193,9 +1308,22 @@ static int __devinit omap_sham_probe(struct platform_device *pdev) goto res_err; } +#ifdef OMAP_SHAM_DMA_PRIVATE err = omap_sham_dma_init(dd); if (err) goto dma_err; +#else + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + dd->dma_lch = dma_request_channel(mask, omap_dma_filter_fn, &dma_chan); + if (!dd->dma_lch) { + dev_err(dev, "unable to obtain RX DMA engine channel %u\n", + dma_chan); + err = -ENXIO; + goto dma_err; + } +#endif dd->io_base = ioremap(dd->phys_base, SZ_4K); if (!dd->io_base) { @@ -1231,7 +1359,11 @@ err_algs: iounmap(dd->io_base); pm_runtime_disable(dev); io_err: +#ifdef OMAP_SHAM_DMA_PRIVATE omap_sham_dma_cleanup(dd); +#else + dma_release_channel(dd->dma_lch); +#endif dma_err: if (dd->irq >= 0) free_irq(dd->irq, dd); @@ -1260,7 +1392,11 @@ static int __devexit omap_sham_remove(struct platform_device *pdev) tasklet_kill(&dd->done_task); iounmap(dd->io_base); pm_runtime_disable(&pdev->dev); +#ifdef OMAP_SHAM_DMA_PRIVATE omap_sham_dma_cleanup(dd); +#else + dma_release_channel(dd->dma_lch); +#endif if (dd->irq >= 0) free_irq(dd->irq, dd); kfree(dd); |