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path: root/drivers/crypto/dcp.c
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Diffstat (limited to 'drivers/crypto/dcp.c')
-rw-r--r--drivers/crypto/dcp.c102
1 files changed, 12 insertions, 90 deletions
diff --git a/drivers/crypto/dcp.c b/drivers/crypto/dcp.c
index eb7a83d276b7..8b54b127d6d0 100644
--- a/drivers/crypto/dcp.c
+++ b/drivers/crypto/dcp.c
@@ -36,7 +36,7 @@
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
-#include <linux/clk.h>
+
#include <linux/io.h>
#include <linux/delay.h>
@@ -60,8 +60,6 @@ struct dcp {
int dcp_vmi_irq;
int dcp_irq;
u32 dcp_regs_base;
- ulong clock_state;
- bool chan_in_use[DCP_NUM_CHANNELS];
/* Following buffers used in hashing to meet 64-byte len alignment */
char *buf1;
@@ -97,10 +95,6 @@ struct dcp {
#define DCP_FILL 0x5000
#define DCP_MODE_MASK 0xf000
-/* clock defines */
-#define CLOCK_ON 1
-#define CLOCK_OFF 0
-
struct dcp_op {
unsigned int flags;
@@ -183,45 +177,6 @@ struct dcp_hash_op {
/* only one */
static struct dcp *global_sdcp;
-static void dcp_clock(struct dcp *sdcp, ulong state, bool force)
-{
- u32 chan;
- struct clk *clk = clk_get(sdcp->dev, "dcp_clk");
-
- /* unless force is true (used during suspend/resume), if any
- * channel is running, then clk is already on, and must stay on */
- if (!force)
- for (chan = 0; chan < DCP_NUM_CHANNELS; chan++)
- if (sdcp->chan_in_use[chan])
- goto exit;
-
- if (state == CLOCK_OFF) {
- /* gate at clock source */
- if (!IS_ERR(clk))
- clk_disable(clk);
- /* gate at DCP */
- else
- __raw_writel(BM_DCP_CTRL_CLKGATE,
- sdcp->dcp_regs_base + HW_DCP_CTRL_SET);
-
- sdcp->clock_state = CLOCK_OFF;
-
- } else {
- /* ungate at clock source */
- if (!IS_ERR(clk))
- clk_enable(clk);
- /* ungate at DCP */
- else
- __raw_writel(BM_DCP_CTRL_CLKGATE,
- sdcp->dcp_regs_base + HW_DCP_CTRL_CLR);
-
- sdcp->clock_state = CLOCK_ON;
- }
-
-exit:
- return;
-}
-
static void dcp_perform_op(struct dcp_op *op)
{
struct dcp *sdcp = global_sdcp;
@@ -307,8 +262,6 @@ static void dcp_perform_op(struct dcp_op *op)
/* submit the work */
mutex_lock(mutex);
- dcp_clock(sdcp, CLOCK_ON, false);
- sdcp->chan_in_use[chan] = true;
__raw_writel(-1, sdcp->dcp_regs_base + HW_DCP_CHnSTAT_CLR(chan));
@@ -337,9 +290,8 @@ static void dcp_perform_op(struct dcp_op *op)
__raw_readl(sdcp->dcp_regs_base +
HW_DCP_CHnSTAT(chan)) & 0xff);
out:
- sdcp->chan_in_use[chan] = false;
- dcp_clock(sdcp, CLOCK_OFF, false);
mutex_unlock(mutex);
+
dma_unmap_single(sdcp->dev, pkt_phys, sizeof(*pkt), DMA_TO_DEVICE);
}
@@ -1109,8 +1061,6 @@ static int dcp_sha_init(struct shash_desc *desc)
struct mutex *mutex = &sdcp->op_mutex[HASH_CHAN];
mutex_lock(mutex);
- dcp_clock(sdcp, CLOCK_ON, false);
- sdcp->chan_in_use[HASH_CHAN] = true;
op->length = 0;
@@ -1240,8 +1190,6 @@ static int dcp_sha_final(struct shash_desc *desc, u8 *out)
for (i = 0; i < digest_len; i++)
*out++ = *--digest;
- sdcp->chan_in_use[HASH_CHAN] = false;
- dcp_clock(sdcp, CLOCK_OFF, false);
mutex_unlock(mutex);
return ret;
@@ -1340,8 +1288,6 @@ static int dcp_bootstream_ioctl(struct inode *inode, struct file *file,
mutex = &sdcp->op_mutex[chan];
mutex_lock(mutex);
- dcp_clock(sdcp, CLOCK_ON, false);
- sdcp->chan_in_use[chan] = true;
__raw_writel(-1, sdcp->dcp_regs_base +
HW_DCP_CHnSTAT_CLR(ROM_DCP_CHAN));
@@ -1402,8 +1348,6 @@ static int dcp_bootstream_ioctl(struct inode *inode, struct file *file,
retVal = 0;
exit:
- sdcp->chan_in_use[chan] = false;
- dcp_clock(sdcp, CLOCK_OFF, false);
mutex_unlock(mutex);
return retVal;
}
@@ -1446,7 +1390,6 @@ static int dcp_probe(struct platform_device *pdev)
for (i = 0; i < DCP_NUM_CHANNELS; i++) {
mutex_init(&sdcp->op_mutex[i]);
init_completion(&sdcp->op_wait[i]);
- sdcp->chan_in_use[i] = false;
}
platform_set_drvdata(pdev, sdcp);
@@ -1457,8 +1400,7 @@ static int dcp_probe(struct platform_device *pdev)
ret = -ENXIO;
goto err_kfree;
}
- sdcp->dcp_regs_base = (u32) ioremap(r->start, r->end - r->start + 1);
- dcp_clock(sdcp, CLOCK_ON, true);
+ sdcp->dcp_regs_base = (u32) IO_ADDRESS(r->start);
/* Soft reset and remove the clock gate */
__raw_writel(BM_DCP_CTRL_SFTRST, sdcp->dcp_regs_base + HW_DCP_CTRL_SET);
@@ -1494,14 +1436,14 @@ static int dcp_probe(struct platform_device *pdev)
if (!r) {
dev_err(&pdev->dev, "can't get IRQ resource (0)\n");
ret = -EIO;
- goto err_gate_clk;
+ goto err_kfree;
}
sdcp->dcp_vmi_irq = r->start;
ret = request_irq(sdcp->dcp_vmi_irq, dcp_vmi_irq, 0, "dcp",
sdcp);
if (ret != 0) {
dev_err(&pdev->dev, "can't request_irq (0)\n");
- goto err_gate_clk;
+ goto err_kfree;
}
r = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
@@ -1522,7 +1464,7 @@ static int dcp_probe(struct platform_device *pdev)
ret = crypto_register_alg(&dcp_aes_alg);
if (ret != 0) {
dev_err(&pdev->dev, "Failed to register aes crypto\n");
- goto err_free_irq1;
+ goto err_kfree;
}
ret = crypto_register_alg(&dcp_aes_ecb_alg);
@@ -1633,7 +1575,6 @@ static int dcp_probe(struct platform_device *pdev)
goto err_dereg;
}
- dcp_clock(sdcp, CLOCK_OFF, false);
dev_notice(&pdev->dev, "DCP crypto enabled.!\n");
return 0;
@@ -1647,12 +1588,8 @@ err_unregister_aes_ecb:
crypto_unregister_alg(&dcp_aes_ecb_alg);
err_unregister_aes:
crypto_unregister_alg(&dcp_aes_alg);
-err_free_irq1:
- free_irq(sdcp->dcp_irq, sdcp);
err_free_irq0:
free_irq(sdcp->dcp_vmi_irq, sdcp);
-err_gate_clk:
- dcp_clock(sdcp, CLOCK_OFF, false);
err_kfree:
kfree(sdcp);
err:
@@ -1667,8 +1604,6 @@ static int dcp_remove(struct platform_device *pdev)
sdcp = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
- dcp_clock(sdcp, CLOCK_ON, false);
-
free_irq(sdcp->dcp_irq, sdcp);
free_irq(sdcp->dcp_vmi_irq, sdcp);
@@ -1707,41 +1642,28 @@ static int dcp_remove(struct platform_device *pdev)
crypto_unregister_alg(&dcp_aes_cbc_alg);
crypto_unregister_alg(&dcp_aes_ecb_alg);
crypto_unregister_alg(&dcp_aes_alg);
-
- dcp_clock(sdcp, CLOCK_OFF, true);
- iounmap((void *) sdcp->dcp_regs_base);
kfree(sdcp);
global_sdcp = NULL;
return 0;
}
+
+#ifdef CONFIG_PM
static int dcp_suspend(struct platform_device *pdev,
pm_message_t state)
{
-#ifdef CONFIG_PM
- struct dcp *sdcp = platform_get_drvdata(pdev);
-
- if (sdcp->clock_state == CLOCK_ON) {
- dcp_clock(sdcp, CLOCK_OFF, true);
- /* indicate that clock needs to be turned on upon resume */
- sdcp->clock_state = CLOCK_ON;
- }
-#endif
return 0;
}
static int dcp_resume(struct platform_device *pdev)
{
-#ifdef CONFIG_PM
- struct dcp *sdcp = platform_get_drvdata(pdev);
-
- /* if clock was on prior to suspend, turn it back on */
- if (sdcp->clock_state == CLOCK_ON)
- dcp_clock(sdcp, CLOCK_ON, true);
-#endif
return 0;
}
+#else
+#define dcp_suspend NULL
+#define dcp_resume NULL
+#endif
static struct platform_driver dcp_driver = {
.probe = dcp_probe,
generated by cgit v1.2.3 (git 2.0.4) at 2024-04-27 15:24:50 +0000