[PATCH 1/4] crypto: hisilicon/zip - fix the uncleared debug registers

[Yang Shen]

From: Hao Fang <fangha...@huawei.com>

ZIP debug registers aren't cleared even if its driver is removed,
so add a clearing operation when remove driver.

Signed-off-by: Hao Fang <fangha...@huawei.com>
Signed-off-by: Yang Shen <shenyan...@huawei.com>
Reviewed-by: Zhou Wang <wangzh...@hisilicon.com>
---
 drivers/crypto/hisilicon/zip/zip_main.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/crypto/hisilicon/zip/zip_main.c 
b/drivers/crypto/hisilicon/zip/zip_main.c
index 8bbae28..cc4a829 100644
--- a/drivers/crypto/hisilicon/zip/zip_main.c
+++ b/drivers/crypto/hisilicon/zip/zip_main.c
@@ -91,6 +91,11 @@
 #define HZIP_SQE_MASK_OFFSET           64
 #define HZIP_SQE_MASK_LEN              48

+#define HZIP_CNT_CLR_CE_EN             BIT(0)
+#define HZIP_RO_CNT_CLR_CE_EN          BIT(2)
+#define HZIP_RD_CNT_CLR_CE_EN          (HZIP_CNT_CLR_CE_EN | \
+                                        HZIP_RO_CNT_CLR_CE_EN)
+
 static const char hisi_zip_name[] = "hisi_zip";
 static struct dentry *hzip_debugfs_root;

@@ -606,10 +611,23 @@ static int hisi_zip_debugfs_init(struct hisi_qm *qm)
        return ret;
 }

+/* hisi_zip_debug_regs_clear() - clear the zip debug regs */
 static void hisi_zip_debug_regs_clear(struct hisi_qm *qm)
 {
+       int i, j;
+
+       /* clear current_qm */
        writel(0x0, qm->io_base + QM_DFX_MB_CNT_VF);
        writel(0x0, qm->io_base + QM_DFX_DB_CNT_VF);
+
+       /* enable register read_clear bit */
+       writel(HZIP_RD_CNT_CLR_CE_EN, qm->io_base + HZIP_SOFT_CTRL_CNT_CLR_CE);
+       for (i = 0; i < ARRAY_SIZE(core_offsets); i++)
+               for (j = 0; j < ARRAY_SIZE(hzip_dfx_regs); j++)
+                       readl(qm->io_base + core_offsets[i] +
+                             hzip_dfx_regs[j].offset);
+
+       /* disable register read_clear bit */
        writel(0x0, qm->io_base + HZIP_SOFT_CTRL_CNT_CLR_CE);

        hisi_qm_debug_regs_clear(qm);
--
2.7.4