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| author | Mike Frysinger <vapier@gentoo.org> | 2011-04-18 18:37:38 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2011-05-25 08:13:43 -0400 |
| commit | 00b5c50e47dacd4d288c6b265e00f85711b9ac64 (patch) | |
| tree | 817e6662c5c91b5e3a8a4130a3af4a287782fe91 /arch/blackfin | |
| parent | 8c0541035007bd8bbacfc5d71c696cdf37696794 (diff) | |
| download | linux-3.10-00b5c50e47dacd4d288c6b265e00f85711b9ac64.tar.gz linux-3.10-00b5c50e47dacd4d288c6b265e00f85711b9ac64.tar.bz2 linux-3.10-00b5c50e47dacd4d288c6b265e00f85711b9ac64.zip | |
Blackfin: optimize MMR reads during startup a bit
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>
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/kernel/setup.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c index 904a25d5e99..2f48f03c634 100644 --- a/arch/blackfin/kernel/setup.c +++ b/arch/blackfin/kernel/setup.c @@ -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 |