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Date: Tue, 8 Apr 2008 18:13:35 +0800
From: "eric miao" <eric.y.miao@...il.com>
To: "Andrew Morton" <akpm@...ux-foundation.org>
Cc: "linux-arm-kernel email list"
<linux-arm-kernel@...ts.arm.linux.org.uk>,
linux-fbdev-devel@...ts.sourceforge.net,
lkml <linux-kernel@...r.kernel.org>,
"Russell King - ARM Linux" <linux@....linux.org.uk>
Subject: Re: [PATCH 1/4] pxafb: introduce lcd_{read,write}l() to wrap the __raw_{read,write}l()
Updated, sorry for the mailer I'm using (gmail web interface), I also
attach the patch hereby:
>From f4d383f836fc0ccee2669836b0355b60a4d4e88a Mon Sep 17 00:00:00 2001
From: Eric Miao <eric.miao@...vell.com>
Date: Thu, 27 Mar 2008 09:28:32 +0800
Subject: [PATCH] pxafb: introduce lcd_{read,write}l() to wrap the
__raw_{read,write}l()
using __raw_{read,write}l() everywhere looks messy, introduce
lcd_{read,write}l() to get this cleaned up a bit
Signed-off-by: eric miao <eric.miao@...vell.com>
---
drivers/video/pxafb.c | 59 +++++++++++++++++++++++++++++--------------------
1 files changed, 35 insertions(+), 24 deletions(-)
diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c
index 0031a5f..4175617 100644
--- a/drivers/video/pxafb.c
+++ b/drivers/video/pxafb.c
@@ -71,6 +71,18 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
struct pxafb_info *);
static void set_ctrlr_state(struct pxafb_info *fbi, u_int state);
+static inline unsigned long
+lcd_readl(struct pxafb_info *fbi, unsigned int off)
+{
+ return __raw_readl(fbi->mmio_base + off);
+}
+
+static inline void
+lcd_writel(struct pxafb_info *fbi, unsigned int off, unsigned long val)
+{
+ __raw_writel(val, fbi->mmio_base + off);
+}
+
static inline void pxafb_schedule_work(struct pxafb_info *fbi, u_int state)
{
unsigned long flags;
@@ -684,8 +696,7 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var,
fbi->reg_lccr1 = new_regs.lccr1;
fbi->reg_lccr2 = new_regs.lccr2;
fbi->reg_lccr3 = new_regs.lccr3;
- fbi->reg_lccr4 = __raw_readl(fbi->mmio_base + LCCR4) &
- (~LCCR4_PAL_FOR_MASK);
+ fbi->reg_lccr4 = lcd_readl(fbi, LCCR4) & ~LCCR4_PAL_FOR_MASK;
fbi->reg_lccr4 |= (fbi->lccr4 & LCCR4_PAL_FOR_MASK);
set_hsync_time(fbi, pcd);
local_irq_restore(flags);
@@ -694,12 +705,12 @@ static int pxafb_activate_var(struct
fb_var_screeninfo *var,
* Only update the registers if the controller is enabled
* and something has changed.
*/
- if ((__raw_readl(fbi->mmio_base + LCCR0) != fbi->reg_lccr0) ||
- (__raw_readl(fbi->mmio_base + LCCR1) != fbi->reg_lccr1) ||
- (__raw_readl(fbi->mmio_base + LCCR2) != fbi->reg_lccr2) ||
- (__raw_readl(fbi->mmio_base + LCCR3) != fbi->reg_lccr3) ||
- (__raw_readl(fbi->mmio_base + FDADR0) != fbi->fdadr[0]) ||
- (__raw_readl(fbi->mmio_base + FDADR1) != fbi->fdadr[1]))
+ if ((lcd_readl(fbi, LCCR0) != fbi->reg_lccr0) ||
+ (lcd_readl(fbi, LCCR1) != fbi->reg_lccr1) ||
+ (lcd_readl(fbi, LCCR2) != fbi->reg_lccr2) ||
+ (lcd_readl(fbi, LCCR3) != fbi->reg_lccr3) ||
+ (lcd_readl(fbi, FDADR0) != fbi->fdadr[0]) ||
+ (lcd_readl(fbi, FDADR1) != fbi->fdadr[1]))
pxafb_schedule_work(fbi, C_REENABLE);
return 0;
@@ -785,14 +796,14 @@ static void pxafb_enable_controller(struct
pxafb_info *fbi)
clk_enable(fbi->clk);
/* Sequence from 11.7.10 */
- __raw_writel(fbi->reg_lccr3, fbi->mmio_base + LCCR3);
- __raw_writel(fbi->reg_lccr2, fbi->mmio_base + LCCR2);
- __raw_writel(fbi->reg_lccr1, fbi->mmio_base + LCCR1);
- __raw_writel(fbi->reg_lccr0 & ~LCCR0_ENB, fbi->mmio_base + LCCR0);
-
- __raw_writel(fbi->fdadr[0], fbi->mmio_base + FDADR0);
- __raw_writel(fbi->fdadr[1], fbi->mmio_base + FDADR1);
- __raw_writel(fbi->reg_lccr0 | LCCR0_ENB, fbi->mmio_base + LCCR0);
+ lcd_writel(fbi, LCCR3, fbi->reg_lccr3);
+ lcd_writel(fbi, LCCR2, fbi->reg_lccr2);
+ lcd_writel(fbi, LCCR1, fbi->reg_lccr1);
+ lcd_writel(fbi, LCCR0, fbi->reg_lccr0 & ~LCCR0_ENB);
+
+ lcd_writel(fbi, FDADR0, fbi->fdadr[0]);
+ lcd_writel(fbi, FDADR1, fbi->fdadr[1]);
+ lcd_writel(fbi, LCCR0, fbi->reg_lccr0 | LCCR0_ENB);
}
static void pxafb_disable_controller(struct pxafb_info *fbi)
@@ -805,11 +816,11 @@ static void pxafb_disable_controller(struct
pxafb_info *fbi)
add_wait_queue(&fbi->ctrlr_wait, &wait);
/* Clear LCD Status Register */
- __raw_writel(0xffffffff, fbi->mmio_base + LCSR);
+ lcd_writel(fbi, LCSR, 0xffffffff);
- lccr0 = __raw_readl(fbi->mmio_base + LCCR0) & ~LCCR0_LDM;
- __raw_writel(lccr0, fbi->mmio_base + LCCR0);
- __raw_writel(lccr0 | LCCR0_DIS, fbi->mmio_base + LCCR0);
+ lccr0 = lcd_readl(fbi, LCCR0) & ~LCCR0_LDM;
+ lcd_writel(fbi, LCCR0, lccr0);
+ lcd_writel(fbi, LCCR0, lccr0 | LCCR0_DIS);
schedule_timeout(200 * HZ / 1000);
remove_wait_queue(&fbi->ctrlr_wait, &wait);
@@ -824,15 +835,15 @@ static void pxafb_disable_controller(struct
pxafb_info *fbi)
static irqreturn_t pxafb_handle_irq(int irq, void *dev_id)
{
struct pxafb_info *fbi = dev_id;
- unsigned int lccr0, lcsr = __raw_readl(fbi->mmio_base + LCSR);
+ unsigned int lccr0, lcsr = lcd_readl(fbi, LCSR);
if (lcsr & LCSR_LDD) {
- lccr0 = __raw_readl(fbi->mmio_base + LCCR0) | LCCR0_LDM;
- __raw_writel(lccr0, fbi->mmio_base + LCCR0);
+ lccr0 = lcd_readl(fbi, LCCR0);
+ lcd_writel(fbi, LCCR0, lccr0 | LCCR0_LDM);
wake_up(&fbi->ctrlr_wait);
}
- __raw_writel(lcsr, fbi->mmio_base + LCSR);
+ lcd_writel(fbi, LCSR, lcsr);
return IRQ_HANDLED;
}
--
1.5.4.3
On Tue, Apr 8, 2008 at 4:20 PM, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Tue, 8 Apr 2008 12:03:16 +0800 "eric miao" <eric.y.miao@...il.com> wrote:
>
> > +#define lcd_readl(f, off) __raw_readl((f)->mmio_base + (off))
> > +#define lcd_writel(f, off, v) __raw_writel((v), (f)->mmio_base + (off))
>
> Please implement things like this in C. Probably inlined.
>
> Advantages:
>
> - C looks nicer
>
> - For some reason people are more likely to document their C than their macros
>
> - macros can sometimes reference their argument multiple times, causing
> bugs when they are passed experssions with side-effects.
>
> - C functions have typechecking
>
> - C functions (whether inlined or not) count as a reference to their
> argument, and can help to avoid unused-variable warnings.
>
>
>
--
Cheers
- eric
View attachment "0001-pxafb-introduce-lcd_-read-write-l-to-wrap-the-__r.patch" of type "text/x-diff" (4848 bytes)
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