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ARM: l2c: realview: improve commentry about the L2 cache requirements 

Add better commentry about the L2 cache requirements on these platforms.
Unfortunately, the auxiliary control register is not pre-set to indicate
the correct cache parameters, so we have to manually program these.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2014-03-19 14:53:54 +00:00
parent 918197be39
commit 39b53458cc
3 changed files with 21 additions and 5 deletions
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9
arch/arm/mach-realview/realview_eb.c
View File

@ -442,8 +442,13 @@ static void __init realview_eb_init(void)
realview_eb11mp_fixup();
#ifdef CONFIG_CACHE_L2X0
/* 1MB (128KB/way), 8-way associativity, evmon/parity/share enabled
* Bits: .... ...0 0111 1001 0000 .... .... .... */
/*
* The PL220 needs to be manually configured as the hardware
* doesn't report the correct sizes.
* 1MB (128KB/way), 8-way associativity, event monitor and
* parity enabled, ignore share bit, no force write allocate
* Bits: .... ...0 0111 1001 0000 .... .... ....
*/
l2x0_init(__io_address(REALVIEW_EB11MP_L220_BASE), 0x00790000, 0xfe000fff);
#endif
platform_device_register(&pmu_device);

8
arch/arm/mach-realview/realview_pb1176.c
View File

@ -355,7 +355,13 @@ static void __init realview_pb1176_init(void)
int i;
#ifdef CONFIG_CACHE_L2X0
/* 128Kb (16Kb/way) 8-way associativity. evmon/parity/share enabled. */
/*
* The PL220 needs to be manually configured as the hardware
* doesn't report the correct sizes.
* 128kB (16kB/way), 8-way associativity, event monitor and
* parity enabled, ignore share bit, no force write allocate
* Bits: .... ...0 0111 0011 0000 .... .... ....
*/
l2x0_init(__io_address(REALVIEW_PB1176_L220_BASE), 0x00730000, 0xfe000fff);
#endif

9
arch/arm/mach-realview/realview_pb11mp.c
View File

@ -337,8 +337,13 @@ static void __init realview_pb11mp_init(void)
int i;
#ifdef CONFIG_CACHE_L2X0
/* 1MB (128KB/way), 8-way associativity, evmon/parity/share enabled
* Bits: .... ...0 0111 1001 0000 .... .... .... */
/*
* The PL220 needs to be manually configured as the hardware
* doesn't report the correct sizes.
* 1MB (128KB/way), 8-way associativity, event monitor and
* parity enabled, ignore share bit, no force write allocate
* Bits: .... ...0 0111 1001 0000 .... .... ....
*/
l2x0_init(__io_address(REALVIEW_TC11MP_L220_BASE), 0x00790000, 0xfe000fff);
#endif