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author | York Sun <yorksun@freescale.com> | 2015-01-06 13:18:42 -0800 |
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committer | York Sun <yorksun@freescale.com> | 2015-02-24 13:08:46 -0800 |
commit | dcd468b8f43c5077c42c75b15cf3204e6b6be46c (patch) | |
tree | 2be7011207c86f70368e7372302366b2bb6e2770 /arch/arm/cpu/armv8/fsl-lsch3/cpu.c | |
parent | 60385d94e56513b50b87724fb9a3878ee5086da9 (diff) | |
download | u-boot-imx-dcd468b8f43c5077c42c75b15cf3204e6b6be46c.zip u-boot-imx-dcd468b8f43c5077c42c75b15cf3204e6b6be46c.tar.gz u-boot-imx-dcd468b8f43c5077c42c75b15cf3204e6b6be46c.tar.bz2 |
armv8/fsl-lsch3: Convert flushing L3 to assembly to avoid using stack
Flushing L3 cache in CCN-504 requries d-cache to be disabled. Using
assembly function to guarantee stack is not used before flushing is
completed. Timeout is needed for simualtor on which CCN-504 is not
implemented. Return value can be checked for timeout situation.
Change bootm.c to disable dcache instead of simply flushing, required
by flushing L3.
Signed-off-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'arch/arm/cpu/armv8/fsl-lsch3/cpu.c')
-rw-r--r-- | arch/arm/cpu/armv8/fsl-lsch3/cpu.c | 53 |
1 files changed, 0 insertions, 53 deletions
diff --git a/arch/arm/cpu/armv8/fsl-lsch3/cpu.c b/arch/arm/cpu/armv8/fsl-lsch3/cpu.c index ada1690..2aaac01 100644 --- a/arch/arm/cpu/armv8/fsl-lsch3/cpu.c +++ b/arch/arm/cpu/armv8/fsl-lsch3/cpu.c @@ -243,59 +243,6 @@ int arch_cpu_init(void) } /* - * flush_l3_cache - * Dickens L3 cache can be flushed by transitioning from FAM to SFONLY power - * state, by writing to HP-F P-state request register. - * Fixme: This function should moved to a common file if other SoCs also use - * the same Dickens. - */ -#define HNF0_PSTATE_REQ 0x04200010 -#define HNF1_PSTATE_REQ 0x04210010 -#define HNF2_PSTATE_REQ 0x04220010 -#define HNF3_PSTATE_REQ 0x04230010 -#define HNF4_PSTATE_REQ 0x04240010 -#define HNF5_PSTATE_REQ 0x04250010 -#define HNF6_PSTATE_REQ 0x04260010 -#define HNF7_PSTATE_REQ 0x04270010 -#define HNFPSTAT_MASK (0xFFFFFFFFFFFFFFFC) -#define HNFPSTAT_FAM 0x3 -#define HNFPSTAT_SFONLY 0x01 - -static void hnf_pstate_req(u64 *ptr, u64 state) -{ - int timeout = 1000; - out_le64(ptr, (in_le64(ptr) & HNFPSTAT_MASK) | (state & 0x3)); - ptr++; - /* checking if the transition is completed */ - while (timeout > 0) { - if (((in_le64(ptr) & 0x0c) >> 2) == (state & 0x3)) - break; - udelay(100); - timeout--; - } -} - -void flush_l3_cache(void) -{ - hnf_pstate_req((u64 *)HNF0_PSTATE_REQ, HNFPSTAT_SFONLY); - hnf_pstate_req((u64 *)HNF1_PSTATE_REQ, HNFPSTAT_SFONLY); - hnf_pstate_req((u64 *)HNF2_PSTATE_REQ, HNFPSTAT_SFONLY); - hnf_pstate_req((u64 *)HNF3_PSTATE_REQ, HNFPSTAT_SFONLY); - hnf_pstate_req((u64 *)HNF4_PSTATE_REQ, HNFPSTAT_SFONLY); - hnf_pstate_req((u64 *)HNF5_PSTATE_REQ, HNFPSTAT_SFONLY); - hnf_pstate_req((u64 *)HNF6_PSTATE_REQ, HNFPSTAT_SFONLY); - hnf_pstate_req((u64 *)HNF7_PSTATE_REQ, HNFPSTAT_SFONLY); - hnf_pstate_req((u64 *)HNF0_PSTATE_REQ, HNFPSTAT_FAM); - hnf_pstate_req((u64 *)HNF1_PSTATE_REQ, HNFPSTAT_FAM); - hnf_pstate_req((u64 *)HNF2_PSTATE_REQ, HNFPSTAT_FAM); - hnf_pstate_req((u64 *)HNF3_PSTATE_REQ, HNFPSTAT_FAM); - hnf_pstate_req((u64 *)HNF4_PSTATE_REQ, HNFPSTAT_FAM); - hnf_pstate_req((u64 *)HNF5_PSTATE_REQ, HNFPSTAT_FAM); - hnf_pstate_req((u64 *)HNF6_PSTATE_REQ, HNFPSTAT_FAM); - hnf_pstate_req((u64 *)HNF7_PSTATE_REQ, HNFPSTAT_FAM); -} - -/* * This function is called from lib/board.c. * It recreates MMU table in main memory. MMU and d-cache are enabled earlier. * There is no need to disable d-cache for this operation. |