GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/arch/arm/cpu/pxa/Makefile

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2000-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+
+extra-y	= start.o
+
+obj-$(CONFIG_CPU_PXA25X)	+= pxa2xx.o
+obj-$(CONFIG_CPU_PXA27X)	+= pxa2xx.o
+
+obj-y	+= cpuinfo.o
+obj-y	+= timer.o
+obj-y	+= usb.o
+obj-y	+= relocate.o
+obj-y	+= cache.o

source/bootloader/u-boot-2020.01/arch/arm/cpu/pxa/cache.c

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2016 Vasily Khoruzhick <anarsoul@gmail.com>
+ */
+
+#include <cpu_func.h>
+#include <linux/types.h>
+#include <common.h>
+
+#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
+void invalidate_dcache_all(void)
+{
+	/* Flush/Invalidate I cache */
+	asm volatile("mcr p15, 0, %0, c7, c5, 0\n" : : "r"(0));
+	/* Flush/Invalidate D cache */
+	asm volatile("mcr p15, 0, %0, c7, c6, 0\n" : : "r"(0));
+}
+
+void flush_dcache_all(void)
+{
+	return invalidate_dcache_all();
+}
+
+void invalidate_dcache_range(unsigned long start, unsigned long stop)
+{
+	start &= ~(CONFIG_SYS_CACHELINE_SIZE - 1);
+	stop &= ~(CONFIG_SYS_CACHELINE_SIZE - 1);
+
+	while (start <= stop) {
+		asm volatile("mcr p15, 0, %0, c7, c6, 1\n" : : "r"(start));
+		start += CONFIG_SYS_CACHELINE_SIZE;
+	}
+}
+
+void flush_dcache_range(unsigned long start, unsigned long stop)
+{
+	return invalidate_dcache_range(start, stop);
+}
+#else /* #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) */
+void invalidate_dcache_all(void)
+{
+}
+
+void flush_dcache_all(void)
+{
+}
+#endif /* #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) */
+
+/*
+ * Stub implementations for l2 cache operations
+ */
+
+__weak void l2_cache_disable(void) {}
+
+#if CONFIG_IS_ENABLED(SYS_THUMB_BUILD)
+__weak void invalidate_l2_cache(void) {}
+#endif

source/bootloader/u-boot-2020.01/arch/arm/cpu/pxa/config.mk

@@ -0,0 +1,18 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# (C) Copyright 2002
+# Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+# Marius Groeger <mgroeger@sysgo.de>
+
+#
+# !WARNING!
+# The PXA's OneNAND SPL uses .text.0 and .text.1 segments to allow booting from
+# really small OneNAND memories where the mmap'd window is only 1KiB big. The
+# .text.0 contains only the bare minimum needed to load the real SPL into SRAM.
+# Add .text.0 and .text.1 into OBJFLAGS, so when the SPL is being objcopy'd,
+# they are not discarded.
+#
+
+#ifdef CONFIG_SPL_BUILD
+OBJCOPYFLAGS += -j .text.0 -j .text.1
+#endif

source/bootloader/u-boot-2020.01/arch/arm/cpu/pxa/cpuinfo.c

@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PXA CPU information display
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <errno.h>
+#include <linux/compiler.h>
+
+#ifdef CONFIG_CPU_PXA25X
+#if ((CONFIG_SYS_INIT_SP_ADDR) != 0xfffff800)
+#error "Init SP address must be set to 0xfffff800 for PXA250"
+#endif
+#endif
+
+#define	CPU_MASK_PXA_PRODID	0x000003f0
+#define	CPU_MASK_PXA_REVID	0x0000000f
+
+#define	CPU_MASK_PRODREV	(CPU_MASK_PXA_PRODID | CPU_MASK_PXA_REVID)
+
+#define	CPU_VALUE_PXA25X	0x100
+#define	CPU_VALUE_PXA27X	0x110
+
+static uint32_t pxa_get_cpuid(void)
+{
+	uint32_t cpuid;
+	asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid));
+	return cpuid;
+}
+
+int cpu_is_pxa25x(void)
+{
+	uint32_t id = pxa_get_cpuid();
+	id &= CPU_MASK_PXA_PRODID;
+	return id == CPU_VALUE_PXA25X;
+}
+
+int cpu_is_pxa27x(void)
+{
+	uint32_t id = pxa_get_cpuid();
+	id &= CPU_MASK_PXA_PRODID;
+	return id == CPU_VALUE_PXA27X;
+}
+
+int cpu_is_pxa27xm(void)
+{
+	uint32_t id = pxa_get_cpuid();
+	return ((id & CPU_MASK_PXA_PRODID) == CPU_VALUE_PXA27X) &&
+			((id & CPU_MASK_PXA_REVID) == 8);
+}
+
+uint32_t pxa_get_cpu_revision(void)
+{
+	return pxa_get_cpuid() & CPU_MASK_PRODREV;
+}
+
+#ifdef	CONFIG_DISPLAY_CPUINFO
+static const char *pxa25x_get_revision(void)
+{
+	static __maybe_unused const char * const revs_25x[] = { "A0" };
+	static __maybe_unused const char * const revs_26x[] = {
+								"A0", "B0", "B1"
+								};
+	static const char *unknown = "Unknown";
+	uint32_t id;
+
+	if (!cpu_is_pxa25x())
+		return unknown;
+
+	id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
+
+/* PXA26x is a sick special case as it can't be told apart from PXA25x :-( */
+#ifdef	CONFIG_CPU_PXA26X
+	switch (id) {
+	case 3: return revs_26x[0];
+	case 5: return revs_26x[1];
+	case 6: return revs_26x[2];
+	}
+#else
+	if (id == 6)
+		return revs_25x[0];
+#endif
+	return unknown;
+}
+
+static const char *pxa27x_get_revision(void)
+{
+	static const char *const rev[] = { "A0", "A1", "B0", "B1", "C0", "C5" };
+	static const char *unknown = "Unknown";
+	uint32_t id;
+
+	if (!cpu_is_pxa27x())
+		return unknown;
+
+	id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
+
+	if ((id == 5) || (id == 6) || (id > 8))
+		return unknown;
+
+	/* Cap the special PXA270 C5 case. */
+	if (id == 7)
+		id = 5;
+
+	/* Cap the special PXA270M A1 case. */
+	if (id == 8)
+		id = 1;
+
+	return rev[id];
+}
+
+static int print_cpuinfo_pxa2xx(void)
+{
+	if (cpu_is_pxa25x()) {
+		puts("Marvell PXA25x rev. ");
+		puts(pxa25x_get_revision());
+	} else if (cpu_is_pxa27x()) {
+		puts("Marvell PXA27x");
+		if (cpu_is_pxa27xm()) puts("M");
+		puts(" rev. ");
+		puts(pxa27x_get_revision());
+	} else
+		return -EINVAL;
+
+	puts("\n");
+
+	return 0;
+}
+
+int print_cpuinfo(void)
+{
+	int ret;
+
+	puts("CPU: ");
+
+	ret = print_cpuinfo_pxa2xx();
+	if (!ret)
+		return ret;
+
+	return ret;
+}
+#endif

source/bootloader/u-boot-2020.01/arch/arm/cpu/pxa/pxa2xx.c

@@ -0,0 +1,293 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ */
+
+#include <common.h>
+#include <cpu_func.h>
+#include <irq_func.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <command.h>
+
+/* Flush I/D-cache */
+static void cache_flush(void)
+{
+	unsigned long i = 0;
+
+	asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (i));
+}
+
+int cleanup_before_linux(void)
+{
+	/*
+	 * This function is called just before we call Linux. It prepares
+	 * the processor for Linux by just disabling everything that can
+	 * disturb booting Linux.
+	 */
+
+	disable_interrupts();
+	icache_disable();
+	dcache_disable();
+	cache_flush();
+
+	return 0;
+}
+
+inline void writelrb(uint32_t val, uint32_t addr)
+{
+	writel(val, addr);
+	asm volatile("" : : : "memory");
+	readl(addr);
+	asm volatile("" : : : "memory");
+}
+
+void pxa2xx_dram_init(void)
+{
+	uint32_t tmp;
+	int i;
+	/*
+	 * 1) Initialize Asynchronous static memory controller
+	 */
+
+	writelrb(CONFIG_SYS_MSC0_VAL, MSC0);
+	writelrb(CONFIG_SYS_MSC1_VAL, MSC1);
+	writelrb(CONFIG_SYS_MSC2_VAL, MSC2);
+	/*
+	 * 2) Initialize Card Interface
+	 */
+
+	/* MECR: Memory Expansion Card Register */
+	writelrb(CONFIG_SYS_MECR_VAL, MECR);
+	/* MCMEM0: Card Interface slot 0 timing */
+	writelrb(CONFIG_SYS_MCMEM0_VAL, MCMEM0);
+	/* MCMEM1: Card Interface slot 1 timing */
+	writelrb(CONFIG_SYS_MCMEM1_VAL, MCMEM1);
+	/* MCATT0: Card Interface Attribute Space Timing, slot 0 */
+	writelrb(CONFIG_SYS_MCATT0_VAL, MCATT0);
+	/* MCATT1: Card Interface Attribute Space Timing, slot 1 */
+	writelrb(CONFIG_SYS_MCATT1_VAL, MCATT1);
+	/* MCIO0: Card Interface I/O Space Timing, slot 0 */
+	writelrb(CONFIG_SYS_MCIO0_VAL, MCIO0);
+	/* MCIO1: Card Interface I/O Space Timing, slot 1 */
+	writelrb(CONFIG_SYS_MCIO1_VAL, MCIO1);
+
+	/*
+	 * 3) Configure Fly-By DMA register
+	 */
+
+	writelrb(CONFIG_SYS_FLYCNFG_VAL, FLYCNFG);
+
+	/*
+	 * 4) Initialize Timing for Sync Memory (SDCLK0)
+	 */
+
+	/*
+	 * Before accessing MDREFR we need a valid DRI field, so we set
+	 * this to power on defaults + DRI field.
+	 */
+
+	/* Read current MDREFR config and zero out DRI */
+	tmp = readl(MDREFR) & ~0xfff;
+	/* Add user-specified DRI */
+	tmp |= CONFIG_SYS_MDREFR_VAL & 0xfff;
+	/* Configure important bits */
+	tmp |= MDREFR_K0RUN | MDREFR_SLFRSH;
+	tmp &= ~(MDREFR_APD | MDREFR_E1PIN);
+
+	/* Write MDREFR back */
+	writelrb(tmp, MDREFR);
+
+	/*
+	 * 5) Initialize Synchronous Static Memory (Flash/Peripherals)
+	 */
+
+	/* Initialize SXCNFG register. Assert the enable bits.
+	 *
+	 * Write SXMRS to cause an MRS command to all enabled banks of
+	 * synchronous static memory. Note that SXLCR need not be written
+	 * at this time.
+	 */
+	writelrb(CONFIG_SYS_SXCNFG_VAL, SXCNFG);
+
+	/*
+	 * 6) Initialize SDRAM
+	 */
+
+	writelrb(CONFIG_SYS_MDREFR_VAL & ~MDREFR_SLFRSH, MDREFR);
+	writelrb(CONFIG_SYS_MDREFR_VAL | MDREFR_E1PIN, MDREFR);
+
+	/*
+	 * 7) Write MDCNFG with MDCNFG:DEx deasserted (set to 0), to configure
+	 *    but not enable each SDRAM partition pair.
+	 */
+
+	writelrb(CONFIG_SYS_MDCNFG_VAL &
+		~(MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3), MDCNFG);
+
+	/* Wait for the clock to the SDRAMs to stabilize, 100..200 usec. */
+	writel(0, OSCR);
+	while (readl(OSCR) < 0x300)
+		asm volatile("" : : : "memory");
+
+	/*
+	 * 8) Trigger a number (usually 8) refresh cycles by attempting
+	 *    non-burst read or write accesses to disabled SDRAM, as commonly
+	 *    specified in the power up sequence documented in SDRAM data
+	 *    sheets. The address(es) used for this purpose must not be
+	 *    cacheable.
+	 */
+	for (i = 9; i >= 0; i--) {
+		writel(i, 0xa0000000);
+		asm volatile("" : : : "memory");
+	}
+	/*
+	 * 9) Write MDCNFG with enable bits asserted (MDCNFG:DEx set to 1).
+	 */
+
+	tmp = CONFIG_SYS_MDCNFG_VAL &
+		(MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3);
+	tmp |= readl(MDCNFG);
+	writelrb(tmp, MDCNFG);
+
+	/*
+	 * 10) Write MDMRS.
+	 */
+
+	writelrb(CONFIG_SYS_MDMRS_VAL, MDMRS);
+
+	/*
+	 * 11) Enable APD
+	 */
+
+	if (CONFIG_SYS_MDREFR_VAL & MDREFR_APD) {
+		tmp = readl(MDREFR);
+		tmp |= MDREFR_APD;
+		writelrb(tmp, MDREFR);
+	}
+}
+
+void pxa_gpio_setup(void)
+{
+	writel(CONFIG_SYS_GPSR0_VAL, GPSR0);
+	writel(CONFIG_SYS_GPSR1_VAL, GPSR1);
+	writel(CONFIG_SYS_GPSR2_VAL, GPSR2);
+#if defined(CONFIG_CPU_PXA27X)
+	writel(CONFIG_SYS_GPSR3_VAL, GPSR3);
+#endif
+
+	writel(CONFIG_SYS_GPCR0_VAL, GPCR0);
+	writel(CONFIG_SYS_GPCR1_VAL, GPCR1);
+	writel(CONFIG_SYS_GPCR2_VAL, GPCR2);
+#if defined(CONFIG_CPU_PXA27X)
+	writel(CONFIG_SYS_GPCR3_VAL, GPCR3);
+#endif
+
+	writel(CONFIG_SYS_GPDR0_VAL, GPDR0);
+	writel(CONFIG_SYS_GPDR1_VAL, GPDR1);
+	writel(CONFIG_SYS_GPDR2_VAL, GPDR2);
+#if defined(CONFIG_CPU_PXA27X)
+	writel(CONFIG_SYS_GPDR3_VAL, GPDR3);
+#endif
+
+	writel(CONFIG_SYS_GAFR0_L_VAL, GAFR0_L);
+	writel(CONFIG_SYS_GAFR0_U_VAL, GAFR0_U);
+	writel(CONFIG_SYS_GAFR1_L_VAL, GAFR1_L);
+	writel(CONFIG_SYS_GAFR1_U_VAL, GAFR1_U);
+	writel(CONFIG_SYS_GAFR2_L_VAL, GAFR2_L);
+	writel(CONFIG_SYS_GAFR2_U_VAL, GAFR2_U);
+#if defined(CONFIG_CPU_PXA27X)
+	writel(CONFIG_SYS_GAFR3_L_VAL, GAFR3_L);
+	writel(CONFIG_SYS_GAFR3_U_VAL, GAFR3_U);
+#endif
+
+	writel(CONFIG_SYS_PSSR_VAL, PSSR);
+}
+
+void pxa_interrupt_setup(void)
+{
+	writel(0, ICLR);
+	writel(0, ICMR);
+#if defined(CONFIG_CPU_PXA27X)
+	writel(0, ICLR2);
+	writel(0, ICMR2);
+#endif
+}
+
+void pxa_clock_setup(void)
+{
+	writel(CONFIG_SYS_CKEN, CKEN);
+	writel(CONFIG_SYS_CCCR, CCCR);
+	asm volatile("mcr	p14, 0, %0, c6, c0, 0" : : "r"(0x0b));
+
+	/* enable the 32Khz oscillator for RTC and PowerManager */
+	writel(OSCC_OON, OSCC);
+	while (!(readl(OSCC) & OSCC_OOK))
+		asm volatile("" : : : "memory");
+}
+
+void pxa_wakeup(void)
+{
+	uint32_t rcsr;
+
+	rcsr = readl(RCSR);
+	writel(rcsr & (RCSR_GPR | RCSR_SMR | RCSR_WDR | RCSR_HWR), RCSR);
+
+	/* Wakeup */
+	if (rcsr & RCSR_SMR) {
+		writel(PSSR_PH, PSSR);
+		pxa2xx_dram_init();
+		icache_disable();
+		dcache_disable();
+		asm volatile("mov	pc, %0" : : "r"(readl(PSPR)));
+	}
+}
+
+int arch_cpu_init(void)
+{
+	pxa_gpio_setup();
+	pxa_wakeup();
+	pxa_interrupt_setup();
+	pxa_clock_setup();
+	return 0;
+}
+
+void i2c_clk_enable(void)
+{
+	/* Set the global I2C clock on */
+	writel(readl(CKEN) | CKEN14_I2C, CKEN);
+}
+
+void __attribute__((weak)) reset_cpu(ulong ignored) __attribute__((noreturn));
+
+void reset_cpu(ulong ignored)
+{
+	uint32_t tmp;
+
+	setbits_le32(OWER, OWER_WME);
+
+	tmp = readl(OSCR);
+	tmp += 0x1000;
+	writel(tmp, OSMR3);
+	writel(MDREFR_SLFRSH, MDREFR);
+
+	for (;;)
+		;
+}
+
+void enable_caches(void)
+{
+#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
+	icache_enable();
+#endif
+#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
+	dcache_enable();
+#endif
+}

source/bootloader/u-boot-2020.01/arch/arm/cpu/pxa/relocate.S

@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ *  relocate - PXA270 vector relocation
+ *
+ *  Copyright (c) 2013  Albert ARIBAUD <albert.u.boot@aribaud.net>
+ */
+
+#include <linux/linkage.h>
+
+/*
+ * The PXA SoC is very specific with respect to exceptions: it
+ * does not provide RAM at the high vectors address (0xFFFF0000),
+ * thus only the low address (0x00000000) is useable; but that is
+ * in ROM, so let's avoid relocating the vectors.
+ */
+	.section	.text.relocate_vectors,"ax",%progbits
+
+ENTRY(relocate_vectors)
+
+	bx	lr
+
+ENDPROC(relocate_vectors)

source/bootloader/u-boot-2020.01/arch/arm/cpu/pxa/start.S

@@ -0,0 +1,205 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ *  armboot - Startup Code for XScale CPU-core
+ *
+ *  Copyright (C) 1998	Dan Malek <dmalek@jlc.net>
+ *  Copyright (C) 1999	Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
+ *  Copyright (C) 2000	Wolfgang Denk <wd@denx.de>
+ *  Copyright (C) 2001	Alex Zuepke <azu@sysgo.de>
+ *  Copyright (C) 2001	Marius Groger <mag@sysgo.de>
+ *  Copyright (C) 2002	Alex Zupke <azu@sysgo.de>
+ *  Copyright (C) 2002	Gary Jennejohn <garyj@denx.de>
+ *  Copyright (C) 2002	Kyle Harris <kharris@nexus-tech.net>
+ *  Copyright (C) 2003	Kai-Uwe Bloem <kai-uwe.bloem@auerswald.de>
+ *  Copyright (C) 2003	Kshitij <kshitij@ti.com>
+ *  Copyright (C) 2003	Richard Woodruff <r-woodruff2@ti.com>
+ *  Copyright (C) 2003	Robert Schwebel <r.schwebel@pengutronix.de>
+ *  Copyright (C) 2004	Texas Instruments <r-woodruff2@ti.com>
+ *  Copyright (C) 2010	Marek Vasut <marek.vasut@gmail.com>
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+
+/*
+ *************************************************************************
+ *
+ * Startup Code (reset vector)
+ *
+ * do important init only if we don't start from memory!
+ * setup Memory and board specific bits prior to relocation.
+ * relocate armboot to ram
+ * setup stack
+ *
+ *************************************************************************
+ */
+
+	.globl	reset
+
+reset:
+	/*
+	 * set the cpu to SVC32 mode
+	 */
+	mrs	r0,cpsr
+	bic	r0,r0,#0x1f
+	orr	r0,r0,#0xd3
+	msr	cpsr,r0
+
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+	bl  cpu_init_crit
+#endif
+
+#ifdef	CONFIG_CPU_PXA25X
+	bl	lock_cache_for_stack
+#endif
+#ifdef	CONFIG_CPU_PXA27X
+	/*
+	 * enable clock for SRAM
+	 */
+	ldr	r0,=CKEN
+	ldr	r1,[r0]
+	orr	r1,r1,#(1 << 20)
+	str	r1,[r0]
+#endif
+	bl	_main
+
+/*------------------------------------------------------------------------------*/
+
+	.globl	c_runtime_cpu_setup
+c_runtime_cpu_setup:
+
+#ifdef CONFIG_CPU_PXA25X
+	/*
+	 * Unlock (actually, disable) the cache now that board_init_f
+	 * is done. We could do this earlier but we would need to add
+	 * a new C runtime hook, whereas c_runtime_cpu_setup already
+	 * exists.
+	 * As this routine is just a call to cpu_init_crit, let us
+	 * tail-optimize and do a simple branch here.
+	 */
+	b	cpu_init_crit
+#else
+	bx	lr
+#endif
+
+/*
+ *************************************************************************
+ *
+ * CPU_init_critical registers
+ *
+ * setup important registers
+ * setup memory timing
+ *
+ *************************************************************************
+ */
+#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) || defined(CONFIG_CPU_PXA25X)
+cpu_init_crit:
+	/*
+	 * flush v4 I/D caches
+	 */
+	mov	r0, #0
+	mcr	p15, 0, r0, c7, c7, 0	/* Invalidate I+D+BTB caches */
+	mcr	p15, 0, r0, c8, c7, 0	/* Invalidate Unified TLB */
+
+	/*
+	 * disable MMU stuff and caches
+	 */
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #0x00003300	@ clear bits 13:12, 9:8 (--VI --RS)
+	bic	r0, r0, #0x00000087	@ clear bits 7, 2:0 (B--- -CAM)
+	orr	r0, r0, #0x00000002	@ set bit 1 (A) Align
+	mcr	p15, 0, r0, c1, c0, 0
+
+	mov	pc, lr		/* back to my caller */
+#endif /* !CONFIG_SKIP_LOWLEVEL_INIT || CONFIG_CPU_PXA25X */
+
+/*
+ * Enable MMU to use DCache as DRAM.
+ *
+ * This is useful on PXA25x and PXA26x in early bootstages, where there is no
+ * other possible memory available to hold stack.
+ */
+#ifdef CONFIG_CPU_PXA25X
+.macro CPWAIT reg
+	mrc	p15, 0, \reg, c2, c0, 0
+	mov	\reg, \reg
+	sub	pc, pc, #4
+.endm
+lock_cache_for_stack:
+	/* Domain access -- enable for all CPs */
+	ldr	r0, =0x0000ffff
+	mcr	p15, 0, r0, c3, c0, 0
+
+	/* Point TTBR to MMU table */
+	ldr	r0, =mmutable
+	mcr	p15, 0, r0, c2, c0, 0
+
+	/* Kick in MMU, ICache, DCache, BTB */
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, #0x1b00
+	bic	r0, #0x0087
+	orr	r0, #0x1800
+	orr	r0, #0x0005
+	mcr	p15, 0, r0, c1, c0, 0
+	CPWAIT	r0
+
+	/* Unlock Icache, Dcache */
+	mcr	p15, 0, r0, c9, c1, 1
+	mcr	p15, 0, r0, c9, c2, 1
+
+	/* Flush Icache, Dcache, BTB */
+	mcr	p15, 0, r0, c7, c7, 0
+
+	/* Unlock I-TLB, D-TLB */
+	mcr	p15, 0, r0, c10, c4, 1
+	mcr	p15, 0, r0, c10, c8, 1
+
+	/* Flush TLB */
+	mcr	p15, 0, r0, c8, c7, 0
+
+	/* Allocate 4096 bytes of Dcache as RAM */
+
+	/* Drain pending loads and stores */
+	mcr	p15, 0, r0, c7, c10, 4
+
+	mov	r4, #0x00
+	mov	r5, #0x00
+	mov	r2, #0x01
+	mcr	p15, 0, r0, c9, c2, 0
+	CPWAIT	r0
+
+	/* 128 lines reserved (128 x 32bytes = 4096 bytes total) */
+	mov	r0, #128
+	ldr	r1, =0xfffff000
+
+alloc:
+	mcr	p15, 0, r1, c7, c2, 5
+	/* Drain pending loads and stores */
+	mcr	p15, 0, r0, c7, c10, 4
+	strd	r4, [r1], #8
+	strd	r4, [r1], #8
+	strd	r4, [r1], #8
+	strd	r4, [r1], #8
+	subs	r0, #0x01
+	bne	alloc
+	/* Drain pending loads and stores */
+	mcr	p15, 0, r0, c7, c10, 4
+	mov	r2, #0x00
+	mcr	p15, 0, r2, c9, c2, 0
+	CPWAIT	r0
+
+	mov	pc, lr
+
+.section .mmutable, "a"
+mmutable:
+	.align	14
+	/* 0x00000000 - 0xffe00000 : 1:1, uncached mapping */
+	.set	__base, 0
+	.rept	0xfff
+	.word	(__base << 20) | 0xc12
+	.set	__base, __base + 1
+	.endr
+
+	/* 0xfff00000 : 1:1, cached mapping */
+	.word	(0xfff << 20) | 0x1c1e
+#endif	/* CONFIG_CPU_PXA25X */

source/bootloader/u-boot-2020.01/arch/arm/cpu/pxa/timer.c

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Marvell PXA2xx/3xx timer driver
+ *
+ * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+int timer_init(void)
+{
+	writel(0, CONFIG_SYS_TIMER_COUNTER);
+	return 0;
+}

source/bootloader/u-boot-2020.01/arch/arm/cpu/pxa/usb.c

@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2006
+ * Markus Klotzbuecher, DENX Software Engineering <mk@denx.de>
+ */
+
+#include <common.h>
+
+#if defined(CONFIG_USB_OHCI_NEW) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT)
+# if defined(CONFIG_CPU_MONAHANS) || defined(CONFIG_CPU_PXA27X)
+
+#include <asm/arch/pxa-regs.h>
+#include <asm/io.h>
+#include <usb.h>
+
+int usb_cpu_init(void)
+{
+#if defined(CONFIG_CPU_MONAHANS)
+	/* Enable USB host clock. */
+	writel(readl(CKENA) | CKENA_2_USBHOST | CKENA_20_UDC, CKENA);
+	udelay(100);
+#endif
+#if defined(CONFIG_CPU_PXA27X)
+	/* Enable USB host clock. */
+	writel(readl(CKEN) | CKEN10_USBHOST, CKEN);
+#endif
+
+#if defined(CONFIG_CPU_MONAHANS)
+	/* Configure Port 2 for Host (USB Client Registers) */
+	writel(0x3000c, UP2OCR);
+#endif
+
+	writel(readl(UHCHR) | UHCHR_FHR, UHCHR);
+	mdelay(11);
+	writel(readl(UHCHR) & ~UHCHR_FHR, UHCHR);
+
+	writel(readl(UHCHR) | UHCHR_FSBIR, UHCHR);
+	while (readl(UHCHR) & UHCHR_FSBIR)
+		udelay(1);
+
+#if defined(CONFIG_CPU_MONAHANS) || defined(CONFIG_PXA27X)
+	writel(readl(UHCHR) & ~UHCHR_SSEP0, UHCHR);
+#endif
+#if defined(CONFIG_CPU_PXA27X)
+	writel(readl(UHCHR) & ~UHCHR_SSEP2, UHCHR);
+#endif
+	writel(readl(UHCHR) & ~(UHCHR_SSEP1 | UHCHR_SSE), UHCHR);
+
+	return 0;
+}
+
+int usb_cpu_stop(void)
+{
+	writel(readl(UHCHR) | UHCHR_FHR, UHCHR);
+	udelay(11);
+	writel(readl(UHCHR) & ~UHCHR_FHR, UHCHR);
+
+	writel(readl(UHCCOMS) | UHCCOMS_HCR, UHCCOMS);
+	udelay(10);
+
+#if defined(CONFIG_CPU_MONAHANS) || defined(CONFIG_PXA27X)
+	writel(readl(UHCHR) | UHCHR_SSEP0, UHCHR);
+#endif
+#if defined(CONFIG_CPU_PXA27X)
+	writel(readl(UHCHR) | UHCHR_SSEP2, UHCHR);
+#endif
+	writel(readl(UHCHR) | UHCHR_SSEP1 | UHCHR_SSE, UHCHR);
+
+#if defined(CONFIG_CPU_MONAHANS)
+	/* Disable USB host clock. */
+	writel(readl(CKENA) & ~(CKENA_2_USBHOST | CKENA_20_UDC), CKENA);
+	udelay(100);
+#endif
+#if defined(CONFIG_CPU_PXA27X)
+	/* Disable USB host clock. */
+	writel(readl(CKEN) & ~CKEN10_USBHOST, CKEN);
+#endif
+
+	return 0;
+}
+
+int usb_cpu_init_fail(void)
+{
+	return usb_cpu_stop();
+}
+
+# endif /* defined(CONFIG_CPU_MONAHANS) || defined(CONFIG_CPU_PXA27X) */
+#endif /* defined(CONFIG_USB_OHCI) && defined(CONFIG_SYS_USB_OHCI_CPU_INIT) */