linux-kernel - [PATCH V3 05/20] bus: omap_l3_noc: switch over to relaxed variants of readl/writel

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Date:	Mon, 28 Apr 2014 10:14:45 -0500
From:	Nishanth Menon <nm@...com>
To:	Tony Lindgren <tony@...mide.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Sricharan R <r.sricharan@...com>, Sekhar Nori <nsekhar@...com>,
	Rajendra Nayak <rnayak@...com>
CC:	Peter Ujfalusi <peter.ujfalusi@...com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nm@...com>
Subject: [PATCH V3 05/20] bus: omap_l3_noc: switch over to relaxed variants of readl/writel

Currently we use __raw_readl and writel in this driver. Considering
there is no specific need for a memory barrier, replacing writel
with endian-neutral writel_relaxed and replacing __raw_readls with
the corresponding endian-neutral readl_relaxed allows us to have a
standard set of register operations for the driver.

While at it, simplify address computation using variables for
register.

Signed-off-by: Nishanth Menon <nm@...com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
Acked-by: Felipe Balbi <balbi@...com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@...com>
Tested-by: Darren Etheridge <detheridge@...com>
---

change in V3: commit message improvement based on Felipe's feedback.
no change since V2 repost.

 drivers/bus/omap_l3_noc.c |   26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/bus/omap_l3_noc.c b/drivers/bus/omap_l3_noc.c
index 37d71b7..c8facb0 100644
--- a/drivers/bus/omap_l3_noc.c
+++ b/drivers/bus/omap_l3_noc.c
@@ -55,6 +55,7 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
 	int err_src = 0;
 	u32 std_err_main, err_reg, clear, masterid;
 	void __iomem *base, *l3_targ_base;
+	void __iomem *l3_targ_stderr, *l3_targ_slvofslsb, *l3_targ_mstaddr;
 	char *target_name, *master_name = "UN IDENTIFIED";
 
 	/* Get the Type of interrupt */
@@ -66,8 +67,8 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
 		 * to determine the source
 		 */
 		base = l3->l3_base[i];
-		err_reg = __raw_readl(base + l3_flagmux[i] +
-					+ L3_FLAGMUX_REGERR0 + (inttype << 3));
+		err_reg = readl_relaxed(base + l3_flagmux[i] +
+					L3_FLAGMUX_REGERR0 + (inttype << 3));
 
 		/* Get the corresponding error and analyse */
 		if (err_reg) {
@@ -76,10 +77,14 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
 
 			/* Read the stderrlog_main_source from clk domain */
 			l3_targ_base = base + *(l3_targ[i] + err_src);
-			std_err_main =  __raw_readl(l3_targ_base +
-					L3_TARG_STDERRLOG_MAIN);
-			masterid = __raw_readl(l3_targ_base +
-					L3_TARG_STDERRLOG_MSTADDR);
+			l3_targ_stderr = l3_targ_base + L3_TARG_STDERRLOG_MAIN;
+			l3_targ_slvofslsb = l3_targ_base +
+					    L3_TARG_STDERRLOG_SLVOFSLSB;
+			l3_targ_mstaddr = l3_targ_base +
+					  L3_TARG_STDERRLOG_MSTADDR;
+
+			std_err_main = readl_relaxed(l3_targ_stderr);
+			masterid = readl_relaxed(l3_targ_mstaddr);
 
 			switch (std_err_main & CUSTOM_ERROR) {
 			case STANDARD_ERROR:
@@ -87,12 +92,10 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
 					l3_targ_inst_name[i][err_src];
 				WARN(true, "L3 standard error: TARGET:%s at address 0x%x\n",
 					target_name,
-					__raw_readl(l3_targ_base +
-						L3_TARG_STDERRLOG_SLVOFSLSB));
+					readl_relaxed(l3_targ_slvofslsb));
 				/* clear the std error log*/
 				clear = std_err_main | CLEAR_STDERR_LOG;
-				writel(clear, l3_targ_base +
-					L3_TARG_STDERRLOG_MAIN);
+				writel_relaxed(clear, l3_targ_stderr);
 				break;
 
 			case CUSTOM_ERROR:
@@ -107,8 +110,7 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
 					master_name, target_name);
 				/* clear the std error log*/
 				clear = std_err_main | CLEAR_STDERR_LOG;
-				writel(clear, l3_targ_base +
-					L3_TARG_STDERRLOG_MAIN);
+				writel_relaxed(clear, l3_targ_stderr);
 				break;
 
 			default:
-- 
1.7.9.5

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