fsl_ifc: Add the workaround for erratum IFC A-003399(enabled on P1010)

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>

3 files changed, 91 insertions, 0 deletions

diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index c2fb5b8628..0478ec1edb 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 c42efb13f8..a04f5c101f 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
@@ -25,6 +25,42 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#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)
 {
@@ -33,6 +69,11 @@ 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);
@@ -62,6 +103,51 @@ 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 6d01479a98..f33db021f1 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;