powerpc/85xx: relocate CCSR before creating the initial RAM area

Before main memory (DDR) is initialized, the on-chip L1 cache is used as a
memory area for the stack and the global data (gd_t) structure.  This is
called the initial RAM area, or initram.  The L1 cache is locked and the TLBs
point to a non-existent address (so that there's no chance it will overlap
main memory or any device).  The L1 cache is also configured not to write
out to memory or the L2 cache, so everything stays in the L1 cache.

One of the things we might do while running out of initram is relocate CCSR.
On reset, CCSR is typically located at some high 32-bit address, like
0xfe000000, and this may not be the best place for CCSR.  For example, on
36-bit systems, CCSR is relocated to 0xffe000000, near the top of 36-bit
memory space.

On some future Freescale SOCs, the L1 cache will be forced to write to the
backing store, so we can no longer have the TLBs point to non-existent address.
Instead, we will point the TLBs to an unused area in CCSR.  In order for this
technique to work, CCSR needs to be relocated before the initram memory is
enabled.

Unlike the original CCSR relocation code in cpu_init_early_f(), the TLBs
we create now for relocating CCSR are deleted after the relocation is finished.
cpu_init_early_f() will still need to create a TLB for CCSR (at the new
location) for normal U-Boot purposes.  This is done to keep the impact to
existing U-Boot code minimal and to better isolate the CCSR relocation code.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 0 insertions, 58 deletions

diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init_early.c b/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
index 32aa94b..64eda94 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init_early.c
@@ -24,51 +24,6 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR_PHYS)
-#ifdef CONFIG_FSL_CORENET
-static void setup_ccsrbar(void)
-{
-	u32 temp;
-	volatile u32 *ccsr_virt = (volatile u32 *)(CONFIG_SYS_CCSRBAR + 0x1000);
-	volatile ccsr_local_t *ccm;
-
-	/*
-	 * We can't call set_law() because we haven't moved
-	 * CCSR yet.
-	 */
-	ccm = (void *)ccsr_virt;
-
-	out_be32(&ccm->law[0].lawbarh,
-		(u64)CONFIG_SYS_CCSRBAR_PHYS >> 32);
-	out_be32(&ccm->law[0].lawbarl, (u32)CONFIG_SYS_CCSRBAR_PHYS);
-	out_be32(&ccm->law[0].lawar,
-		LAW_EN | (0x1e << 20) | LAW_SIZE_4K);
-
-	in_be32((u32 *)(ccsr_virt + 0));
-	in_be32((u32 *)(ccsr_virt + 1));
-	isync();
-
-	ccm = (void *)CONFIG_SYS_CCSRBAR;
-	/* Now use the temporary LAW to move CCSR */
-	out_be32(&ccm->ccsrbarh, (u64)CONFIG_SYS_CCSRBAR_PHYS >> 32);
-	out_be32(&ccm->ccsrbarl, (u32)CONFIG_SYS_CCSRBAR_PHYS);
-	out_be32(&ccm->ccsrar, CCSRAR_C);
-	temp = in_be32(&ccm->ccsrar);
-	disable_law(0);
-}
-#else
-static void setup_ccsrbar(void)
-{
-	u32 temp;
-	volatile u32 *ccsr_virt = (volatile u32 *)(CONFIG_SYS_CCSRBAR + 0x1000);
-
-	temp = in_be32(ccsr_virt);
-	out_be32(ccsr_virt, CONFIG_SYS_CCSRBAR_PHYS >> 12);
-	temp = in_be32((volatile u32 *)CONFIG_SYS_CCSRBAR);
-}
-#endif
-#endif
-
 /* We run cpu_init_early_f in AS = 1 */
 void cpu_init_early_f(void)
 {
@@ -93,19 +48,6 @@ void cpu_init_early_f(void)
 
 	write_tlb(mas0, mas1, mas2, mas3, mas7);
 
-	/* set up CCSR if we want it moved */
-#if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR_PHYS)
-	mas0 = MAS0_TLBSEL(0) | MAS0_ESEL(1);
-	/* mas1 is the same as above */
-	mas2 = FSL_BOOKE_MAS2(CONFIG_SYS_CCSRBAR + 0x1000, MAS2_I|MAS2_G);
-	mas3 = FSL_BOOKE_MAS3(CONFIG_SYS_CCSRBAR_DEFAULT, 0, MAS3_SW|MAS3_SR);
-	mas7 = FSL_BOOKE_MAS7(CONFIG_SYS_CCSRBAR_DEFAULT);
-
-	write_tlb(mas0, mas1, mas2, mas3, mas7);
-
-	setup_ccsrbar();
-#endif
-
 	init_laws();
 	invalidate_tlb(0);
 	init_tlbs();