mirror of
https://github.com/brain-hackers/u-boot-brain
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![Kevin Smith](/assets/img/avatar_default.png)
SMP-enabled Linux kernels read the CBAR register in CP15 to find the address of the SCU registers. After remapping internal registers, also update the CBAR so the kernel can find them. Signed-off-by: Kevin Smith <kevin.smith@elecsyscorp.com> Acked-by: Stefan Roese <sr@denx.de>
265 lines
6.1 KiB
C
265 lines
6.1 KiB
C
/*
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* Copyright (C) 2014-2015 Stefan Roese <sr@denx.de>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <netdev.h>
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#include <asm/io.h>
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#include <asm/pl310.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/soc.h>
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#define DDR_BASE_CS_OFF(n) (0x0000 + ((n) << 3))
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#define DDR_SIZE_CS_OFF(n) (0x0004 + ((n) << 3))
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static struct mbus_win windows[] = {
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/* PCIE MEM address space */
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{ DEFADR_PCI_MEM, 256 << 20, CPU_TARGET_PCIE13, CPU_ATTR_PCIE_MEM },
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/* PCIE IO address space */
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{ DEFADR_PCI_IO, 64 << 10, CPU_TARGET_PCIE13, CPU_ATTR_PCIE_IO },
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/* SPI */
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{ DEFADR_SPIF, 8 << 20, CPU_TARGET_DEVICEBUS_BOOTROM_SPI,
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CPU_ATTR_SPIFLASH },
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/* NOR */
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{ DEFADR_BOOTROM, 8 << 20, CPU_TARGET_DEVICEBUS_BOOTROM_SPI,
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CPU_ATTR_BOOTROM },
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};
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void reset_cpu(unsigned long ignored)
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{
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struct mvebu_system_registers *reg =
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(struct mvebu_system_registers *)MVEBU_SYSTEM_REG_BASE;
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writel(readl(®->rstoutn_mask) | 1, ®->rstoutn_mask);
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writel(readl(®->sys_soft_rst) | 1, ®->sys_soft_rst);
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while (1)
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;
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}
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int mvebu_soc_family(void)
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{
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u16 devid = (readl(MVEBU_REG_PCIE_DEVID) >> 16) & 0xffff;
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if (devid == SOC_MV78460_ID)
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return MVEBU_SOC_AXP;
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if (devid == SOC_88F6810_ID || devid == SOC_88F6820_ID ||
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devid == SOC_88F6828_ID)
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return MVEBU_SOC_A38X;
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return MVEBU_SOC_UNKNOWN;
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}
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#if defined(CONFIG_DISPLAY_CPUINFO)
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int print_cpuinfo(void)
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{
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u16 devid = (readl(MVEBU_REG_PCIE_DEVID) >> 16) & 0xffff;
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u8 revid = readl(MVEBU_REG_PCIE_REVID) & 0xff;
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puts("SoC: ");
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switch (devid) {
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case SOC_MV78460_ID:
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puts("MV78460-");
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break;
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case SOC_88F6810_ID:
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puts("MV88F6810-");
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break;
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case SOC_88F6820_ID:
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puts("MV88F6820-");
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break;
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case SOC_88F6828_ID:
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puts("MV88F6828-");
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break;
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default:
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puts("Unknown-");
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break;
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}
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if (mvebu_soc_family() == MVEBU_SOC_AXP) {
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switch (revid) {
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case 1:
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puts("A0\n");
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break;
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case 2:
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puts("B0\n");
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break;
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default:
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printf("?? (%x)\n", revid);
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break;
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}
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}
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if (mvebu_soc_family() == MVEBU_SOC_A38X) {
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switch (revid) {
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case MV_88F68XX_Z1_ID:
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puts("Z1\n");
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break;
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case MV_88F68XX_A0_ID:
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puts("A0\n");
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break;
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default:
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printf("?? (%x)\n", revid);
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break;
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}
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}
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return 0;
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}
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#endif /* CONFIG_DISPLAY_CPUINFO */
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/*
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* This function initialize Controller DRAM Fastpath windows.
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* It takes the CS size information from the 0x1500 scratch registers
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* and sets the correct windows sizes and base addresses accordingly.
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*
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* These values are set in the scratch registers by the Marvell
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* DDR3 training code, which is executed by the BootROM before the
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* main payload (U-Boot) is executed. This training code is currently
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* only available in the Marvell U-Boot version. It needs to be
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* ported to mainline U-Boot SPL at some point.
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*/
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static void update_sdram_window_sizes(void)
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{
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u64 base = 0;
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u32 size, temp;
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int i;
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for (i = 0; i < SDRAM_MAX_CS; i++) {
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size = readl((MVEBU_SDRAM_SCRATCH + (i * 8))) & SDRAM_ADDR_MASK;
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if (size != 0) {
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size |= ~(SDRAM_ADDR_MASK);
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/* Set Base Address */
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temp = (base & 0xFF000000ll) | ((base >> 32) & 0xF);
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writel(temp, MVEBU_SDRAM_BASE + DDR_BASE_CS_OFF(i));
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/*
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* Check if out of max window size and resize
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* the window
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*/
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temp = (readl(MVEBU_SDRAM_BASE + DDR_SIZE_CS_OFF(i)) &
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~(SDRAM_ADDR_MASK)) | 1;
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temp |= (size & SDRAM_ADDR_MASK);
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writel(temp, MVEBU_SDRAM_BASE + DDR_SIZE_CS_OFF(i));
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base += ((u64)size + 1);
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} else {
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/*
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* Disable window if not used, otherwise this
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* leads to overlapping enabled windows with
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* pretty strange results
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*/
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clrbits_le32(MVEBU_SDRAM_BASE + DDR_SIZE_CS_OFF(i), 1);
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}
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}
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}
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#ifdef CONFIG_ARCH_CPU_INIT
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static void set_cbar(u32 addr)
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{
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asm("mcr p15, 4, %0, c15, c0" : : "r" (addr));
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}
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int arch_cpu_init(void)
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{
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/* Linux expects the internal registers to be at 0xf1000000 */
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writel(SOC_REGS_PHY_BASE, INTREG_BASE_ADDR_REG);
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set_cbar(SOC_REGS_PHY_BASE + 0xC000);
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/*
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* We need to call mvebu_mbus_probe() before calling
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* update_sdram_window_sizes() as it disables all previously
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* configured mbus windows and then configures them as
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* required for U-Boot. Calling update_sdram_window_sizes()
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* without this configuration will not work, as the internal
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* registers can't be accessed reliably because of potenial
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* double mapping.
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* After updating the SDRAM access windows we need to call
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* mvebu_mbus_probe() again, as this now correctly configures
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* the SDRAM areas that are later used by the MVEBU drivers
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* (e.g. USB, NETA).
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*/
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/*
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* First disable all windows
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*/
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mvebu_mbus_probe(NULL, 0);
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if (mvebu_soc_family() == MVEBU_SOC_AXP) {
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/*
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* Now the SDRAM access windows can be reconfigured using
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* the information in the SDRAM scratch pad registers
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*/
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update_sdram_window_sizes();
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}
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/*
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* Finally the mbus windows can be configured with the
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* updated SDRAM sizes
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*/
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mvebu_mbus_probe(windows, ARRAY_SIZE(windows));
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return 0;
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}
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#endif /* CONFIG_ARCH_CPU_INIT */
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/*
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* SOC specific misc init
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*/
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#if defined(CONFIG_ARCH_MISC_INIT)
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int arch_misc_init(void)
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{
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/* Nothing yet, perhaps we need something here later */
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return 0;
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}
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#endif /* CONFIG_ARCH_MISC_INIT */
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#ifdef CONFIG_MVNETA
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int cpu_eth_init(bd_t *bis)
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{
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u32 enet_base[] = { MVEBU_EGIGA0_BASE, MVEBU_EGIGA1_BASE,
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MVEBU_EGIGA2_BASE, MVEBU_EGIGA3_BASE };
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u8 phy_addr[] = CONFIG_PHY_ADDR;
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int i;
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/*
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* Only Armada XP supports all 4 ethernet interfaces. A38x has
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* slightly different base addresses for its 2-3 interfaces.
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*/
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if (mvebu_soc_family() != MVEBU_SOC_AXP) {
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enet_base[1] = MVEBU_EGIGA2_BASE;
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enet_base[2] = MVEBU_EGIGA3_BASE;
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}
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for (i = 0; i < ARRAY_SIZE(phy_addr); i++)
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mvneta_initialize(bis, enet_base[i], i, phy_addr[i]);
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return 0;
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}
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#endif
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#ifndef CONFIG_SYS_DCACHE_OFF
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void enable_caches(void)
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{
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struct pl310_regs *const pl310 =
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(struct pl310_regs *)CONFIG_SYS_PL310_BASE;
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/* First disable L2 cache - may still be enable from BootROM */
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if (mvebu_soc_family() == MVEBU_SOC_A38X)
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clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN);
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/* Avoid problem with e.g. neta ethernet driver */
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invalidate_dcache_all();
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/* Enable D-cache. I-cache is already enabled in start.S */
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dcache_enable();
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}
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#endif
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