mtd: nand: pxa3xx_nand: add register access debug

Add verbose debug for register accesses. This enables easier debugging
by following where and how hardware is stimulated, and how it answers.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 86fc245..e42496a 100644 (file)
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -131,11 +131,23 @@
 #define READ_ID_BYTES          7
 
 /* macros for registers read/write */
-#define nand_writel(info, off, val)    \
-       writel_relaxed((val), (info)->mmio_base + (off))
-
-#define nand_readl(info, off)          \
-       readl_relaxed((info)->mmio_base + (off))
+#define nand_writel(info, off, val)                                    \
+       do {                                                            \
+               dev_vdbg(&info->pdev->dev,                              \
+                        "%s():%d nand_writel(0x%x, 0x%04x)\n",         \
+                        __func__, __LINE__, (val), (off));             \
+               writel_relaxed((val), (info)->mmio_base + (off));       \
+       } while (0)
+
+#define nand_readl(info, off)                                          \
+       ({                                                              \
+               unsigned int _v;                                        \
+               _v = readl_relaxed((info)->mmio_base + (off));          \
+               dev_vdbg(&info->pdev->dev,                              \
+                        "%s():%d nand_readl(0x%04x) = 0x%x\n",         \
+                        __func__, __LINE__, (off), _v);                \
+               _v;                                                     \
+       })
 
 /* error code and state */
 enum {