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crypto: mxs-dcp - Add support for dcp clk 

On 6ull and 6sll the DCP block has a clock which needs to be explicitly
enabled.

Add minimal handling for this at probe/remove time.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Leonard Crestez 2018-11-07 15:33:32 +00:00 committed by Herbert Xu
parent 70db8b79e5
commit 57f002891e
1 changed files with 25 additions and 3 deletions
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28
drivers/crypto/mxs-dcp.c
View File

@ -20,6 +20,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/stmp_device.h>
#include <linux/clk.h>
#include <crypto/aes.h>
#include <crypto/sha.h>
@ -82,6 +83,7 @@ struct dcp {
spinlock_t lock[DCP_MAX_CHANS];
struct task_struct *thread[DCP_MAX_CHANS];
struct crypto_queue queue[DCP_MAX_CHANS];
struct clk *dcp_clk;
};
enum dcp_chan {
@ -1053,11 +1055,24 @@ static int mxs_dcp_probe(struct platform_device *pdev)
/* Re-align the structure so it fits the DCP constraints. */
sdcp->coh = PTR_ALIGN(sdcp->coh, DCP_ALIGNMENT);
/* Restart the DCP block. */
ret = stmp_reset_block(sdcp->base);
/* DCP clock is optional, only used on some SOCs */
sdcp->dcp_clk = devm_clk_get(dev, "dcp");
if (IS_ERR(sdcp->dcp_clk)) {
if (sdcp->dcp_clk != ERR_PTR(-ENOENT))
return PTR_ERR(sdcp->dcp_clk);
sdcp->dcp_clk = NULL;
}
ret = clk_prepare_enable(sdcp->dcp_clk);
if (ret)
return ret;
/* Restart the DCP block. */
ret = stmp_reset_block(sdcp->base);
if (ret) {
dev_err(dev, "Failed reset\n");
goto err_disable_unprepare_clk;
}
/* Initialize control register. */
writel(MXS_DCP_CTRL_GATHER_RESIDUAL_WRITES |
MXS_DCP_CTRL_ENABLE_CONTEXT_CACHING | 0xf,
@ -1094,7 +1109,8 @@ static int mxs_dcp_probe(struct platform_device *pdev)
NULL, "mxs_dcp_chan/sha");
if (IS_ERR(sdcp->thread[DCP_CHAN_HASH_SHA])) {
dev_err(dev, "Error starting SHA thread!\n");
return PTR_ERR(sdcp->thread[DCP_CHAN_HASH_SHA]);
ret = PTR_ERR(sdcp->thread[DCP_CHAN_HASH_SHA]);
goto err_disable_unprepare_clk;
}
sdcp->thread[DCP_CHAN_CRYPTO] = kthread_run(dcp_chan_thread_aes,
@ -1151,6 +1167,10 @@ err_destroy_aes_thread:
err_destroy_sha_thread:
kthread_stop(sdcp->thread[DCP_CHAN_HASH_SHA]);
err_disable_unprepare_clk:
clk_disable_unprepare(sdcp->dcp_clk);
return ret;
}
@ -1170,6 +1190,8 @@ static int mxs_dcp_remove(struct platform_device *pdev)
kthread_stop(sdcp->thread[DCP_CHAN_HASH_SHA]);
kthread_stop(sdcp->thread[DCP_CHAN_CRYPTO]);
clk_disable_unprepare(sdcp->dcp_clk);
platform_set_drvdata(pdev, NULL);
global_sdcp = NULL;