arch/powerpc/cpu/mpc85xx/cpu_init_early.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2009-2012 Freescale Semiconductor, Inc
 */

#include <asm/ppc.h>
#include <system-constants.h>
#include <linux/types.h>
#include <asm-offsets.h>
#include <asm/global_data.h>
#include <asm/processor.h>
#include <asm/mmu.h>
#include <asm/fsl_law.h>
#include <asm/io.h>

DECLARE_GLOBAL_DATA_PTR;

#ifdef CONFIG_A003399_NOR_WORKAROUND
void setup_ifc(void)
{
	struct fsl_ifc ifc_regs = {(void *)CFG_SYS_IFC_ADDR, (void *)NULL};
	u32 _mas0, _mas1, _mas2, _mas3, _mas7;
	phys_addr_t flash_phys = CFG_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 += (~CFG_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_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");

#if defined(CONFIG_SYS_PPC_E500_DEBUG_TLB)
/*
 * TLB entry for debuggging in AS1
 * Create temporary TLB entry in AS0 to handle debug exception
 * As on debug exception MSR is cleared i.e. Address space is changed
 * to 0. A TLB entry (in AS0) is required to handle debug exception generated
 * in AS1.
 *
 * TLB entry is created for IVPR + IVOR15 to map on valid OP code address
 * bacause flash's physical address is going to change as
 * CFG_SYS_FLASH_BASE_PHYS.
 */
	_mas0 = MAS0_TLBSEL(1) |
			MAS0_ESEL(CONFIG_SYS_PPC_E500_DEBUG_TLB);
	_mas1 = MAS1_VALID | MAS1_TID(0) | MAS1_IPROT |
			MAS1_TSIZE(BOOKE_PAGESZ_4M);
	_mas2 = FSL_BOOKE_MAS2(CONFIG_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");
#endif

	/* Change flash's physical address */
	ifc_out32(&(ifc_regs.gregs->cspr_cs[0].cspr), CFG_SYS_CSPR0);
	ifc_out32(&(ifc_regs.gregs->csor_cs[0].csor), CFG_SYS_CSOR0);
	ifc_out32(&(ifc_regs.gregs->amask_cs[0].amask), CFG_SYS_AMASK0);

	return;
}
#endif

/* We run cpu_init_early_f in AS = 1 */
void cpu_init_early_f(void *fdt)
{
	u32 mas0, mas1, mas2, mas3, mas7;
#ifdef CONFIG_SYS_FSL_ERRATUM_P1010_A003549
	ccsr_gur_t *gur = (void *)(CFG_SYS_MPC85xx_GUTS_ADDR);
#endif
#ifdef CONFIG_A003399_NOR_WORKAROUND
	ccsr_l2cache_t *l2cache = (void *)CFG_SYS_MPC85xx_L2_ADDR;
	u32  *dst, *src;
	void (*setup_ifc_sram)(void);
	int i;
#endif

	/* Pointer is writable since we allocated a register for it */
	gd = (gd_t *)SYS_INIT_SP_ADDR;

	/* gd area was zeroed during startup */

#ifdef CONFIG_ARCH_QEMU_E500
	/*
	 * CFG_SYS_CCSRBAR_PHYS below may use gd->fdt_blob on ePAPR systems,
	 * so we need to populate it before it accesses it.
	 */
	gd->fdt_blob = fdt;
#endif

	mas0 = MAS0_TLBSEL(1) | MAS0_ESEL(13);
	mas1 = MAS1_VALID | MAS1_TID(0) | MAS1_TS | MAS1_TSIZE(BOOKE_PAGESZ_1M);
	mas2 = FSL_BOOKE_MAS2(CFG_SYS_CCSRBAR, MAS2_I|MAS2_G);
	mas3 = FSL_BOOKE_MAS3(CFG_SYS_CCSRBAR_PHYS, 0, MAS3_SW|MAS3_SR);
	mas7 = FSL_BOOKE_MAS7(CFG_SYS_CCSRBAR_PHYS);

	write_tlb(mas0, mas1, mas2, mas3, mas7);

/*
 * Work Around for IFC Erratum A-003549. This issue is P1010
 * specific. LCLK(a free running clk signal) is muxed with IFC_CS3 on P1010 SOC
 * Hence specifically selecting CS3.
 */
#ifdef CONFIG_SYS_FSL_ERRATUM_P1010_A003549
	setbits_be32(&gur->pmuxcr, MPC85xx_PMUXCR_LCLK_IFC_CS3);
#endif

#ifdef CONFIG_FSL_LAW
	init_laws();
#endif

/*
 * Work Around for IFC Erratum A003399, issue will hit only when execution
 * from NOR Flash
 */
#ifdef CONFIG_A003399_NOR_WORKAROUND
#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++) {
		/* cppcheck-suppress nullPointer */
		*dst++ = *src++;
	}

	/* cppcheck-suppress nullPointer */
	setup_ifc_sram();

	/* CLEANUP */
	clrbits_be32(&l2cache->l2ctl,
			(MPC85xx_L2CTL_L2E |
			 MPC85xx_L2CTL_L2SRAM_ENTIRE));
	out_be32(&l2cache->l2srbar0, 0x0);
#endif

	invalidate_tlb(1);

#if defined(CONFIG_SYS_PPC_E500_DEBUG_TLB) && \
	!(CONFIG_IS_ENABLED(INIT_MINIMAL) && defined(CONFIG_SPL_BUILD)) && \
	!defined(CONFIG_NAND_SPL)
	disable_tlb(CONFIG_SYS_PPC_E500_DEBUG_TLB);
#endif

	init_tlbs();
}