Patchwork [U-Boot,4/4] fsl_ifc: Add the workaround for erratum IFC A-003399(enabled on P1010)

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Submitter Kumar Gala
Date Aug. 1, 2011, 6:30 a.m.
Message ID <1312180248-28528-4-git-send-email-galak@kernel.crashing.org>
Download mbox | patch
Permalink /patch/107677/
State Superseded
Delegated to: Kumar Gala
Headers show

Comments

Kumar Gala - Aug. 1, 2011, 6:30 a.m.
From: Poonam Aggrwal <poonam.aggrwal@freescale.com>

Issue: Address masking doesn't work properly.
When sum of the base address, defined by BA, and memory bank size,
defined by AM, exceeds 4GB (0xffff_ffff) then AMASKn[AM] doesn't mask
CSPRn[BA] bits.

Impact:
This will impact booting when we are reprogramming CSPR0(BA) and
AMASK0(AMASK) while executing from NOR Flash.

Workaround:
Re-programming of CSPR(BA) and AMASK is done while not executing from NOR
Flash. The code which programs the BA and AMASK is executed from L2-SRAM.

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
 arch/powerpc/cpu/mpc85xx/cmd_errata.c     |    3 +
 arch/powerpc/cpu/mpc85xx/cpu_init_early.c |   86 +++++++++++++++++++++++++++++
 arch/powerpc/cpu/mpc85xx/cpu_init_nand.c  |    2 +
 arch/powerpc/cpu/mpc8xxx/fsl_ifc.c        |    2 +
 arch/powerpc/include/asm/config_mpc85xx.h |    2 +
 5 files changed, 95 insertions(+), 0 deletions(-)
Wolfgang Denk - Aug. 1, 2011, 10:21 a.m.
Dear Kumar Gala,

In message <1312180248-28528-4-git-send-email-galak@kernel.crashing.org> you wrote:
> From: Poonam Aggrwal <poonam.aggrwal@freescale.com>
> 
> Issue: Address masking doesn't work properly.
> When sum of the base address, defined by BA, and memory bank size,
> defined by AM, exceeds 4GB (0xffff_ffff) then AMASKn[AM] doesn't mask
> CSPRn[BA] bits.
> 
> Impact:
> This will impact booting when we are reprogramming CSPR0(BA) and
> AMASK0(AMASK) while executing from NOR Flash.
> 
> Workaround:
> Re-programming of CSPR(BA) and AMASK is done while not executing from NOR
> Flash. The code which programs the BA and AMASK is executed from L2-SRAM.
> 
> Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

Checkpatch says:

ERROR: trailing whitespace
#148: FILE: arch/powerpc/cpu/mpc85xx/cpu_init_early.c:95:
+^I_mas1 = MAS1_VALID | MAS1_TID(0) | MAS1_TS | MAS1_IPROT | $

Please cleanup.



Kumar,  could you __please__ get used to running your patches throuch
checkpatch __before__ submitting?  Thanks.


Wolfgang Denk
Kumar Gala - Aug. 1, 2011, 3:16 p.m.
On Aug 1, 2011, at 5:21 AM, Wolfgang Denk wrote:

> Dear Kumar Gala,
> 
> In message <1312180248-28528-4-git-send-email-galak@kernel.crashing.org> you wrote:
>> From: Poonam Aggrwal <poonam.aggrwal@freescale.com>
>> 
>> Issue: Address masking doesn't work properly.
>> When sum of the base address, defined by BA, and memory bank size,
>> defined by AM, exceeds 4GB (0xffff_ffff) then AMASKn[AM] doesn't mask
>> CSPRn[BA] bits.
>> 
>> Impact:
>> This will impact booting when we are reprogramming CSPR0(BA) and
>> AMASK0(AMASK) while executing from NOR Flash.
>> 
>> Workaround:
>> Re-programming of CSPR(BA) and AMASK is done while not executing from NOR
>> Flash. The code which programs the BA and AMASK is executed from L2-SRAM.
>> 
>> Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
>> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
> 
> Checkpatch says:
> 
> ERROR: trailing whitespace
> #148: FILE: arch/powerpc/cpu/mpc85xx/cpu_init_early.c:95:
> +^I_mas1 = MAS1_VALID | MAS1_TID(0) | MAS1_TS | MAS1_IPROT | $
> 
> Please cleanup.
> 
> 
> 
> Kumar,  could you __please__ get used to running your patches throuch
> checkpatch __before__ submitting?  Thanks.

I try to, but not all of them are by me ;)

Will be nice when have a version of checkpatch in u-boot source tree.

- k
Wolfgang Denk - Aug. 4, 2011, 9:24 p.m.
Dear Kumar Gala,

In message <08144324-BE32-4A54-BC2D-B920F18F3D43@kernel.crashing.org> you wrote:
> 
> > Kumar,  could you __please__ get used to running your patches throuch
> > checkpatch __before__ submitting?  Thanks.
> 
> I try to, but not all of them are by me ;)

I know.  But you submitted them, so you are responsible.

> Will be nice when have a version of checkpatch in u-boot source tree.

Indeed.  Submit a patch?

Best regards,

Wolfgang Denk

Patch

diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index c2fb5b8..0478ec1 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -93,6 +93,9 @@  static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #ifdef CONFIG_SYS_FSL_ERRATUM_P1010_A003549
 	puts("Work-around for Erratum P1010-A003549 enabled\n");
 #endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_IFC_A003399
+	puts("Work-around for Erratum IFC A-003399 enabled\n");
+#endif
 	return 0;
 }
 
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init_early.c b/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
index 05097b9..77c33bf 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
@@ -78,6 +78,42 @@  static void setup_ccsrbar(void)
 #endif
 #endif
 
+#if defined(CONFIG_SYS_FSL_ERRATUM_IFC_A003399) && !defined(CONFIG_SYS_RAMBOOT)
+void setup_ifc(void)
+{
+	struct fsl_ifc *ifc_regs = (void *)CONFIG_SYS_IFC_ADDR;
+	u32 _mas0, _mas1, _mas2, _mas3, _mas7;
+	phys_addr_t flash_phys = CONFIG_SYS_FLASH_BASE_PHYS;
+
+	/*
+	 * Adjust the TLB we were running out of to match the phys addr of the
+	 * chip select we are adjusting and will return to.
+	 */
+	flash_phys += (~CONFIG_SYS_AMASK0) + 1 - 4*1024*1024;
+
+	_mas0 = MAS0_TLBSEL(1) | MAS0_ESEL(15);
+	_mas1 = MAS1_VALID | MAS1_TID(0) | MAS1_TS | MAS1_IPROT | 
+			MAS1_TSIZE(BOOKE_PAGESZ_4M);
+	_mas2 = FSL_BOOKE_MAS2(CONFIG_SYS_TEXT_BASE, MAS2_I|MAS2_G);
+	_mas3 = FSL_BOOKE_MAS3(flash_phys, 0, MAS3_SW|MAS3_SR|MAS3_SX);
+	_mas7 = FSL_BOOKE_MAS7(flash_phys);
+
+	mtspr(MAS0, _mas0);
+	mtspr(MAS1, _mas1);
+	mtspr(MAS2, _mas2);
+	mtspr(MAS3, _mas3);
+	mtspr(MAS7, _mas7);
+
+	asm volatile("isync;msync;tlbwe;isync");
+
+	out_be32(&(ifc_regs->cspr_cs[0].cspr), CONFIG_SYS_CSPR0);
+	out_be32(&(ifc_regs->csor_cs[0].csor), CONFIG_SYS_CSOR0);
+	out_be32(&(ifc_regs->amask_cs[0].amask), CONFIG_SYS_AMASK0);
+
+	return ;
+}
+#endif
+
 /* We run cpu_init_early_f in AS = 1 */
 void cpu_init_early_f(void)
 {
@@ -86,6 +122,11 @@  void cpu_init_early_f(void)
 #ifdef CONFIG_SYS_FSL_ERRATUM_P1010_A003549
 	ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
 #endif
+#if defined(CONFIG_SYS_FSL_ERRATUM_IFC_A003399) && !defined(CONFIG_SYS_RAMBOOT)
+	ccsr_l2cache_t *l2cache = (void *)CONFIG_SYS_MPC85xx_L2_ADDR;
+	u32  *l2srbar, *dst, *src;
+	void (*setup_ifc_sram)(void);
+#endif
 
 	/* Pointer is writable since we allocated a register for it */
 	gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
@@ -128,6 +169,51 @@  void cpu_init_early_f(void)
 #endif
 
 	init_laws();
+
+/*
+ * Work Around for IFC Erratum A003399, issue will hit only when execution
+ * from NOR Flash
+ */
+#if defined(CONFIG_SYS_FSL_ERRATUM_IFC_A003399) && !defined(CONFIG_SYS_RAMBOOT)
+#define SRAM_BASE_ADDR	(0x00000000)
+	/* TLB for SRAM */
+	mas0 = MAS0_TLBSEL(1) | MAS0_ESEL(9);
+	mas1 = MAS1_VALID | MAS1_TID(0) | MAS1_TS |
+		MAS1_TSIZE(BOOKE_PAGESZ_1M);
+	mas2 = FSL_BOOKE_MAS2(SRAM_BASE_ADDR, MAS2_I);
+	mas3 = FSL_BOOKE_MAS3(SRAM_BASE_ADDR, 0, MAS3_SX|MAS3_SW|MAS3_SR);
+	mas7 = FSL_BOOKE_MAS7(0);
+
+	write_tlb(mas0, mas1, mas2, mas3, mas7);
+
+	out_be32(&l2cache->l2srbar0, SRAM_BASE_ADDR);
+
+	out_be32(&l2cache->l2errdis,
+		(MPC85xx_L2ERRDIS_MBECC | MPC85xx_L2ERRDIS_SBECC));
+
+	out_be32(&l2cache->l2ctl,
+		(MPC85xx_L2CTL_L2E | MPC85xx_L2CTL_L2SRAM_ENTIRE));
+
+	/*
+	 * Copy the code in setup_ifc to L2SRAM. Do a word copy
+	 * because NOR Flash on P1010 does not support byte
+	 * access (Erratum IFC-A002769)
+	 */
+	setup_ifc_sram = (void *)SRAM_BASE_ADDR;
+	dst = (u32 *) SRAM_BASE_ADDR;
+	src = (u32 *) setup_ifc;
+	for (i = 0; i < 1024; i++)
+		*l2srbar++ = *src++;
+
+	setup_ifc_sram();
+
+	/* CLEANUP */
+	clrbits_be32(&l2cache->l2ctl,
+			(MPC85xx_L2CTL_L2E |
+			 MPC85xx_L2CTL_L2SRAM_ENTIRE));
+	out_be32(&l2cache->l2srbar0, 0x0);
+#endif
+
 	invalidate_tlb(1);
 	init_tlbs();
 }
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init_nand.c b/arch/powerpc/cpu/mpc85xx/cpu_init_nand.c
index 6d01479..f33db02 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init_nand.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init_nand.c
@@ -43,12 +43,14 @@  void cpu_init_f(void)
 #endif
 #endif
 #ifdef CONFIG_FSL_IFC
+#ifndef	CONFIG_SYS_FSL_ERRATUM_IFC_A003399
 #if defined(CONFIG_SYS_CSPR0) && defined(CONFIG_SYS_CSOR0)
 	set_ifc_cspr(IFC_CS0, CONFIG_SYS_CSPR0);
 	set_ifc_amask(IFC_CS0, CONFIG_SYS_AMASK0);
 	set_ifc_csor(IFC_CS0, CONFIG_SYS_CSOR0);
 #endif
 #endif
+#endif
 
 #if defined(CONFIG_SYS_RAMBOOT) && defined(CONFIG_SYS_INIT_L2_ADDR)
 	ccsr_l2cache_t *l2cache = (void *)CONFIG_SYS_MPC85xx_L2_ADDR;
diff --git a/arch/powerpc/cpu/mpc8xxx/fsl_ifc.c b/arch/powerpc/cpu/mpc8xxx/fsl_ifc.c
index e794821..6682496 100644
--- a/arch/powerpc/cpu/mpc8xxx/fsl_ifc.c
+++ b/arch/powerpc/cpu/mpc8xxx/fsl_ifc.c
@@ -43,10 +43,12 @@  void init_early_memctl_regs(void)
 	set_ifc_ftim(IFC_CS0, IFC_FTIM2, CONFIG_SYS_CS0_FTIM2);
 	set_ifc_ftim(IFC_CS0, IFC_FTIM3, CONFIG_SYS_CS0_FTIM3);
 
+#if !defined(CONFIG_SYS_FSL_ERRATUM_IFC_A003399) || defined(CONFIG_SYS_RAMBOOT)
 	set_ifc_cspr(IFC_CS0, CONFIG_SYS_CSPR0);
 	set_ifc_amask(IFC_CS0, CONFIG_SYS_AMASK0);
 	set_ifc_csor(IFC_CS0, CONFIG_SYS_CSOR0);
 #endif
+#endif
 
 #if defined(CONFIG_SYS_CSPR1) && defined(CONFIG_SYS_CSOR1)
 	set_ifc_ftim(IFC_CS1, IFC_FTIM0, CONFIG_SYS_CS1_FTIM0);
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index 171ea12..eeb2b41 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -114,6 +114,7 @@ 
 #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY
 #define CONFIG_SYS_FSL_ERRATUM_IFC_A002769
 #define CONFIG_SYS_FSL_ERRATUM_P1010_A003549
+#define CONFIG_SYS_FSL_ERRATUM_IFC_A003399
 
 /* P1011 is single core version of P1020 */
 #elif defined(CONFIG_P1011)
@@ -164,6 +165,7 @@ 
 #define CONFIG_SYS_FSL_USB_INTERNAL_UTMI_PHY
 #define CONFIG_SYS_FSL_ERRATUM_IFC_A002769
 #define CONFIG_SYS_FSL_ERRATUM_P1010_A003549
+#define CONFIG_SYS_FSL_ERRATUM_IFC_A003399
 
 /* P1015 is single core version of P1024 */
 #elif defined(CONFIG_P1015)