cpu.c with _weak arch_cpu_init()

u-boot-tree/arch/arm/mach-zynq/cpu.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2012 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2012 Xilinx, Inc. All rights reserved.
+ */
+#include <common.h>
+#include <zynqpl.h>
+#include <asm/io.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/ps7_init_gpl.h>
+#include <asm/arch/sys_proto.h>
+
+#define ZYNQ_SILICON_VER_MASK	0xF0000000
+#define ZYNQ_SILICON_VER_SHIFT	28
+
+#if (defined(CONFIG_FPGA) && !defined(CONFIG_SPL_BUILD)) || \
+    (defined(CONFIG_SPL_FPGA_SUPPORT) && defined(CONFIG_SPL_BUILD))
+xilinx_desc fpga = {
+	.family = xilinx_zynq,
+	.iface = devcfg,
+	.operations = &zynq_op,
+};
+#endif
+
+static const struct {
+	u8 idcode;
+#if defined(CONFIG_FPGA)
+	u32 fpga_size;
+#endif
+	char *devicename;
+} zynq_fpga_descs[] = {
+	ZYNQ_DESC(7Z007S),
+	ZYNQ_DESC(7Z010),
+	ZYNQ_DESC(7Z012S),
+	ZYNQ_DESC(7Z014S),
+	ZYNQ_DESC(7Z015),
+	ZYNQ_DESC(7Z020),
+	ZYNQ_DESC(7Z030),
+	ZYNQ_DESC(7Z035),
+	ZYNQ_DESC(7Z045),
+	ZYNQ_DESC(7Z100),
+	{ /* Sentinel */ },
+};
+
+/* ELPHEL: Added __weak because the function is overridden in ezynq.c */
+__weak int arch_cpu_init(void)
+{
+	zynq_slcr_unlock();
+#ifndef CONFIG_SPL_BUILD
+	/* Device config APB, unlock the PCAP */
+	writel(0x757BDF0D, &devcfg_base->unlock);
+	writel(0xFFFFFFFF, &devcfg_base->rom_shadow);
+
+#if (CONFIG_SYS_SDRAM_BASE == 0)
+	/* remap DDR to zero, FILTERSTART */
+	writel(0, &scu_base->filter_start);
+
+	/* OCM_CFG, Mask out the ROM, map ram into upper addresses */
+	writel(0x1F, &slcr_base->ocm_cfg);
+	/* FPGA_RST_CTRL, clear resets on AXI fabric ports */
+	writel(0x0, &slcr_base->fpga_rst_ctrl);
+	/* Set urgent bits with register */
+	writel(0x0, &slcr_base->ddr_urgent_sel);
+	/* Urgent write, ports S2/S3 */
+	writel(0xC, &slcr_base->ddr_urgent);
+#endif
+#endif
+	zynq_slcr_lock();
+
+	return 0;
+}
+
+unsigned int zynq_get_silicon_version(void)
+{
+	return (readl(&devcfg_base->mctrl) & ZYNQ_SILICON_VER_MASK)
+						>> ZYNQ_SILICON_VER_SHIFT;
+}
+
+void reset_cpu(ulong addr)
+{
+	zynq_slcr_cpu_reset();
+	while (1)
+		;
+}
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+void enable_caches(void)
+{
+	/* Enable D-cache. I-cache is already enabled in start.S */
+	dcache_enable();
+}
+#endif
+
+static int __maybe_unused cpu_desc_id(void)
+{
+	u32 idcode;
+	u8 i;
+
+	idcode = zynq_slcr_get_idcode();
+	for (i = 0; zynq_fpga_descs[i].idcode; i++) {
+		if (zynq_fpga_descs[i].idcode == idcode)
+			return i;
+	}
+
+	return -ENODEV;
+}
+
+#if defined(CONFIG_ARCH_EARLY_INIT_R)
+int arch_early_init_r(void)
+{
+#if (defined(CONFIG_FPGA) && !defined(CONFIG_SPL_BUILD)) || \
+    (defined(CONFIG_SPL_FPGA_SUPPORT) && defined(CONFIG_SPL_BUILD))
+	int cpu_id = cpu_desc_id();
+
+	if (cpu_id < 0)
+		return 0;
+
+	fpga.size = zynq_fpga_descs[cpu_id].fpga_size;
+	fpga.name = zynq_fpga_descs[cpu_id].devicename;
+	fpga_init();
+	fpga_add(fpga_xilinx, &fpga);
+#endif
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_DISPLAY_CPUINFO
+int print_cpuinfo(void)
+{
+	u32 version;
+	int cpu_id = cpu_desc_id();
+
+	if (cpu_id < 0)
+		return 0;
+
+	version = zynq_get_silicon_version() << 1;
+	if (version > (PCW_SILICON_VERSION_3 << 1))
+		version += 1;
+
+	printf("CPU:   Zynq %s\n", zynq_fpga_descs[cpu_id].devicename);
+	printf("Silicon: v%d.%d\n", version >> 1, version & 1);
+	return 0;
+}
+#endif