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Blackfin: optimize MMR reads during startup a bit

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Since the value of these MMRs aren't changing, store the value in a local
variable and work off of that.  This avoids multiple MMR reads which are
implicitly forced by the volatile markings.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2011-04-18 18:37:38 -04:00
parent 8c05410350
commit 00b5c50e47
1 changed files with 9 additions and 11 deletions
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20
arch/blackfin/kernel/setup.c
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@ -853,6 +853,7 @@ void __init native_machine_early_platform_add_devices(void)
void __init setup_arch(char **cmdline_p)
{
u32 mmr;
unsigned long sclk, cclk;
native_machine_early_platform_add_devices();
@ -923,17 +924,14 @@ void __init setup_arch(char **cmdline_p)
bfin_read_IMDMA_D1_IRQ_STATUS();
}
#endif
printk(KERN_INFO "Hardware Trace ");
if (bfin_read_TBUFCTL() & 0x1)
printk(KERN_CONT "Active ");
else
printk(KERN_CONT "Off ");
if (bfin_read_TBUFCTL() & 0x2)
printk(KERN_CONT "and Enabled\n");
else
printk(KERN_CONT "and Disabled\n");
printk(KERN_INFO "Boot Mode: %i\n", bfin_read_SYSCR() & 0xF);
mmr = bfin_read_TBUFCTL();
printk(KERN_INFO "Hardware Trace %s and %sabled\n",
(mmr & 0x1) ? "active" : "off",
(mmr & 0x2) ? "en" : "dis");
mmr = bfin_read_SYSCR();
printk(KERN_INFO "Boot Mode: %i\n", mmr & 0xF);
/* Newer parts mirror SWRST bits in SYSCR */
#if defined(CONFIG_BF53x) || defined(CONFIG_BF561) || \
@ -941,7 +939,7 @@ void __init setup_arch(char **cmdline_p)
_bfin_swrst = bfin_read_SWRST();
#else
/* Clear boot mode field */
_bfin_swrst = bfin_read_SYSCR() & ~0xf;
_bfin_swrst = mmr & ~0xf;
#endif
#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT