linux-kernel - [PATCH] staging: crystalhd: printk register accesses to debug for big-endian systems

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Message-ID: <4ba8c564.8109cc0a.6677.4856@mx.google.com>
Date:	Tue, 23 Mar 2010 06:43:00 -0700 (PDT)
From:	leon.woestenberg@...il.com
To:	Leon Woestenberg <leon@...ebranch.com>
Subject: [PATCH] staging: crystalhd: printk register accesses to debug for big-endian systems

The CrystalHD device driver assumes a little endian host. In order to verify future work on
endianess-independence, this patch adds printk's to track the register access to the device.

This helps verify bitfield endianess correctness as well as any hard-coded assumptions in
the driver code.

Signed-off-by: Leon Woestenberg <leon@...ebranch.com>



--- git.orig/drivers/staging/crystalhd/crystalhd_misc.c	2010-03-21 16:05:52.000000000 +0100
+++ git/drivers/staging/crystalhd/crystalhd_misc.c	2010-03-23 13:44:45.324121364 +0100
@@ -140,12 +140,14 @@
  */
 uint32_t bc_dec_reg_rd(struct crystalhd_adp *adp, uint32_t reg_off)
 {
+	uint32_t val;
 	if (!adp || (reg_off > adp->pci_mem_len)) {
 		BCMLOG_ERR("dec_rd_reg_off outof range: 0x%08x\n", reg_off);
 		return 0;
 	}
-
-	return readl(adp->addr + reg_off);
+	val = readl(adp->addr + reg_off);
+	printk(KERN_DEBUG "bc_dec_reg_rd(): read(0x%p) = 0x%08x\n", adp->addr + reg_off, val);
+	return val;
 }
 
 /**
@@ -167,6 +169,7 @@
 		BCMLOG_ERR("dec_wr_reg_off outof range: 0x%08x\n", reg_off);
 		return;
 	}
+	printk(KERN_DEBUG "bc_dec_reg_wr(): writel(0x%08x @ 0x%p).\n", val, adp->addr + reg_off);
 	writel(val, adp->addr + reg_off);
 	udelay(8);
 }
@@ -186,11 +189,14 @@
  */
 uint32_t crystalhd_reg_rd(struct crystalhd_adp *adp, uint32_t reg_off)
 {
+	uint32_t val;
 	if (!adp || (reg_off > adp->pci_i2o_len)) {
-		BCMLOG_ERR("link_rd_reg_off outof range: 0x%08x\n", reg_off);
+		printk(KERN_DEBUG "link_rd_reg_off outof range: 0x%08x\n", reg_off);
 		return 0;
 	}
-	return readl(adp->i2o_addr + reg_off);
+	val = readl(adp->i2o_addr + reg_off);
+	printk(KERN_DEBUG "crystalhd_reg_rd(): read(0x%p) = 0x%08x\n", adp->i2o_addr + reg_off, val);
+	return val;
 }
 
 /**
@@ -213,6 +219,7 @@
 		BCMLOG_ERR("link_wr_reg_off outof range: 0x%08x\n", reg_off);
 		return;
 	}
+	printk(KERN_DEBUG "crystalhd_reg_wr(): writel(0x%08x @ 0x%p).\n", val, adp->i2o_addr + reg_off);
 	writel(val, adp->i2o_addr + reg_off);
 }
 
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