[U-Boot] [PATCH 01/11] powerpc/mpc85xx: Enable L2 at the beginning of U-boot for E6500

[Scott Wood]

On 08/17/2012 01:27 PM, York Sun wrote:
> Using E6500 L1 cache as initram requires L2 cache enabled.
> Add l2-cache cluster enabling.
> 
> Signed-off-by: York Sun <yorksun at freescale.com>
> Signed-off-by: Kumar Gala <galak at kernel.crashing.org>
> ---
>  arch/powerpc/cpu/mpc85xx/cpu_init.c   |   39 ++++++++++++++++++++++-
>  arch/powerpc/cpu/mpc85xx/start.S      |   57 +++++++++++++++++++++++++++++++++
>  arch/powerpc/include/asm/immap_85xx.h |   43 +++++++++++++++++++++++++
>  3 files changed, 138 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
> index 2c78905..1a2858a 100644
> --- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
> +++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
> @@ -309,6 +309,34 @@ static void __fsl_serdes__init(void)
>  }
>  __attribute__((weak, alias("__fsl_serdes__init"))) void fsl_serdes_init(void);
>  
> +#ifdef CONFIG_E6500
> +int enable_cluster_l2(void)

If enabling L2 is required for the stack, how are we enabling it in C
code?  Is this just for non-boot clusters?

> +{
> +	int i = 0;
> +	u32 cluster;
> +	ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
> +	struct ccsr_cluster_l2 *l2cache;
> +
> +	cluster = in_be32(&gur->tp_cluster[i++].lower);
> +	if (cluster & TP_CLUSTER_EOC)
> +		return 0;
> +
> +	do {
> +		l2cache = (void *)(CONFIG_SYS_FSL_CLUSTER_1_L2 + i * 0x40000);
> +		cluster = in_be32(&gur->tp_cluster[i++].lower);
> +
> +		printf("enable l2 for cluster %d %p\n", i, l2cache);

This should be a debug message (or removed), not a normal printf.

> +
> +		out_be32(&l2cache->l2csr0, L2CSR0_L2FI|L2CSR0_L2LFC);
> +		while ((in_be32(&l2cache->l2csr0) & (L2CSR0_L2FI|L2CSR0_L2LFC)) != 0)
> +			;

Timeout?

> @@ -322,6 +350,11 @@ int cpu_init_r(void)
>  #ifdef CONFIG_SYS_LBC_LCRR
>  	volatile fsl_lbc_t *lbc = LBC_BASE_ADDR;
>  #endif
> +#ifdef CONFIG_L2_CACHE
> +	volatile ccsr_l2cache_t *l2cache = (void *)CONFIG_SYS_MPC85xx_L2_ADDR;
> +#elif defined(CONFIG_E6500)
> +	struct ccsr_cluster_l2 * l2cache = (void *)CONFIG_SYS_FSL_CLUSTER_1_L2;
> +#endif

If CONFIG_L2_CACHE doesn't apply to e6500, then CONFIG_L2_CACHE is misnamed.

> diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S
> index 2e1d265..739127f 100644
> --- a/arch/powerpc/cpu/mpc85xx/start.S
> +++ b/arch/powerpc/cpu/mpc85xx/start.S
> @@ -762,6 +762,63 @@ delete_temp_tlbs:
>  	tlbwe
>  #endif /* #if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR_PHYS) */
>  
> +#ifdef CONFIG_E6500
> +create_ccsr_l2_tlb:
> +	/*
> +	 * Create a TLB for the MMR location of CCSR
> +	 * to access L2CSR0 register
> +	 */
> +	lis     r0, FSL_BOOKE_MAS0(0, 0, 0)@h
> +	ori     r0, r0, FSL_BOOKE_MAS0(0, 0, 0)@l
> +
> +	lis     r1, FSL_BOOKE_MAS1(1, 0, 0, 0, BOOKE_PAGESZ_4K)@h
> +	ori     r1, r1, FSL_BOOKE_MAS1(1, 0, 0, 0, BOOKE_PAGESZ_4K)@l
> +	lis     r2, FSL_BOOKE_MAS2(CONFIG_SYS_CCSRBAR + 0xC20000, (MAS2_I|MAS2_G))@h
> +	ori     r2, r2, FSL_BOOKE_MAS2(CONFIG_SYS_CCSRBAR + 0xC20000, (MAS2_I|MAS2_G))@l
> +	lis     r3, FSL_BOOKE_MAS3(CONFIG_SYS_CCSRBAR_PHYS_LOW + 0xC20000, 0, (MAS3_SW|MAS3_SR))@h
> +	ori     r3, r3, FSL_BOOKE_MAS3(CONFIG_SYS_CCSRBAR_PHYS_LOW + 0xC20000, 0, (MAS3_SW|MAS3_SR))@l
> +	lis	r7, CONFIG_SYS_CCSRBAR_PHYS_HIGH at h
> +	ori	r7, r7, CONFIG_SYS_CCSRBAR_PHYS_HIGH at l
> +	mtspr   MAS0, r0
> +	mtspr   MAS1, r1
> +	mtspr   MAS2, r2
> +	mtspr   MAS3, r3
> +	mtspr   MAS7, r7
> +	isync
> +	msync
> +	tlbwe

Let's make a macro (asm, not cpp) out of this instead of copy and
pasting all over the place.  And stop misusing r1/r2.

-Scott