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ppc/85xx: Add tracking of TLB CAM usage

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We need to track which TLB CAM entries are used to allow us to
"dynamically" allocate entries later in the code.  For example the SPD
DDR code today hard codes which TLB entries it uses.  We can now make
that pick entries that are free.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala
2009-11-12 10:26:16 -06:00
parent ee53650dad
commit 94e9411b9d
5 changed files with 77 additions and 0 deletions
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7
include/asm-ppc/config.h
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@@ -63,6 +63,13 @@
#define CONFIG_TSECV2
#endif
/* Number of TLB CAM entries we have on FSL Book-E chips */
#if defined(CONFIG_E500MC)
#define CONFIG_SYS_NUM_TLBCAMS 64
#elif defined(CONFIG_E500)
#define CONFIG_SYS_NUM_TLBCAMS 16
#endif
/* Relocation to SDRAM works on all PPC boards */
#define CONFIG_RELOC_FIXUP_WORKS

3
include/asm-ppc/global_data.h
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@@ -107,6 +107,9 @@ typedef struct global_data {
#if defined(CONFIG_FSL_LAW)
u32 used_laws;
#endif
#if defined(CONFIG_E500)
u32 used_tlb_cams[(CONFIG_SYS_NUM_TLBCAMS+31)/32];
#endif
#if defined(CONFIG_MPC5xxx)
unsigned long ipb_clk;
unsigned long pci_clk;

2
include/asm-ppc/mmu.h
View File

@@ -479,6 +479,8 @@ extern void disable_tlb(u8 esel);
extern void invalidate_tlb(u8 tlb);
extern void init_tlbs(void);
extern int find_tlb_idx(void *addr, u8 tlbsel);
extern void init_used_tlb_cams(void);
extern int find_free_tlbcam(void);
extern unsigned int setup_ddr_tlbs(unsigned int memsize_in_meg);