kevin/linux
1
Fork 0
Code

mips: bmips: enable RAC on BMIPS4350

Browse Source 
The data RAC is left disabled by the bootloader in some SoCs, at least in
the core it boots from.
Enabling this feature increases the performance up to +30% depending on the
task.

Signed-off-by: Daniel González Cabanelas <dgcbueu@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[ rework code and reduce code duplication ]
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Daniel González Cabanelas 2024-06-20 17:26:45 +02:00 committed by Thomas Bogendoerfer
parent b95b30e50a
commit 04f38d1a4d
1 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
arch/mips/kernel/smp-bmips.c
View File

@ -592,6 +592,7 @@ asmlinkage void __weak plat_wired_tlb_setup(void)
void bmips_cpu_setup(void)
{
void __iomem __maybe_unused *cbr = bmips_cbr_addr;
u32 __maybe_unused rac_addr;
u32 __maybe_unused cfg;
switch (current_cpu_type()) {
@ -620,6 +621,23 @@ void bmips_cpu_setup(void)
__raw_readl(cbr + BMIPS_RAC_ADDRESS_RANGE);
break;
case CPU_BMIPS4350:
rac_addr = BMIPS_RAC_CONFIG_1;
if (!(read_c0_brcm_cmt_local() & (1 << 31)))
rac_addr = BMIPS_RAC_CONFIG;
/* Enable data RAC */
cfg = __raw_readl(cbr + rac_addr);
__raw_writel(cfg | 0xf, cbr + rac_addr);
__raw_readl(cbr + rac_addr);
/* Flush stale data out of the readahead cache */
cfg = __raw_readl(cbr + BMIPS_RAC_CONFIG);
__raw_writel(cfg | 0x100, cbr + BMIPS_RAC_CONFIG);
__raw_readl(cbr + BMIPS_RAC_CONFIG);
break;
case CPU_BMIPS4380:
/* CBG workaround for early BMIPS4380 CPUs */
switch (read_c0_prid()) {