arch/arm/mach-socfpga/misc.c

/*
 *  Copyright (C) 2012 Altera Corporation <www.altera.com>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/io.h>
#include <fdtdec.h>
#include <libfdt.h>
#include <altera.h>
#include <miiphy.h>
#include <netdev.h>
#include <watchdog.h>
#include <asm/arch/reset_manager.h>
#include <asm/arch/system_manager.h>
#include <asm/arch/dwmmc.h>
#include <asm/arch/nic301.h>
#include <asm/arch/scu.h>
#include <asm/pl310.h>

#include <dt-bindings/reset/altr,rst-mgr.h>

DECLARE_GLOBAL_DATA_PTR;

static struct pl310_regs *const pl310 =
	(struct pl310_regs *)CONFIG_SYS_PL310_BASE;
static struct socfpga_system_manager *sysmgr_regs =
	(struct socfpga_system_manager *)SOCFPGA_SYSMGR_ADDRESS;
static struct socfpga_reset_manager *reset_manager_base =
	(struct socfpga_reset_manager *)SOCFPGA_RSTMGR_ADDRESS;
static struct nic301_registers *nic301_regs =
	(struct nic301_registers *)SOCFPGA_L3REGS_ADDRESS;
static struct scu_registers *scu_regs =
	(struct scu_registers *)SOCFPGA_MPUSCU_ADDRESS;

int dram_init(void)
{
	gd->ram_size = get_ram_size((long *)PHYS_SDRAM_1, PHYS_SDRAM_1_SIZE);
	return 0;
}

void enable_caches(void)
{
#ifndef CONFIG_SYS_ICACHE_OFF
	icache_enable();
#endif
#ifndef CONFIG_SYS_DCACHE_OFF
	dcache_enable();
#endif
}

/*
 * DesignWare Ethernet initialization
 */
#ifdef CONFIG_ETH_DESIGNWARE
static void dwmac_deassert_reset(const unsigned int of_reset_id)
{
	u32 physhift, reset;

	if (of_reset_id == EMAC0_RESET) {
		physhift = SYSMGR_EMACGRP_CTRL_PHYSEL0_LSB;
		reset = SOCFPGA_RESET(EMAC0);
	} else if (of_reset_id == EMAC1_RESET) {
		physhift = SYSMGR_EMACGRP_CTRL_PHYSEL1_LSB;
		reset = SOCFPGA_RESET(EMAC1);
	} else {
		printf("GMAC: Invalid reset ID (%i)!\n", of_reset_id);
		return;
	}

	/* Clearing emac0 PHY interface select to 0 */
	clrbits_le32(&sysmgr_regs->emacgrp_ctrl,
		     SYSMGR_EMACGRP_CTRL_PHYSEL_MASK << physhift);

	/* configure to PHY interface select choosed */
	setbits_le32(&sysmgr_regs->emacgrp_ctrl,
		     SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII << physhift);

	/* Release the EMAC controller from reset */
	socfpga_per_reset(reset, 0);
}

int cpu_eth_init(bd_t *bis)
{
	const void *fdt = gd->fdt_blob;
	struct fdtdec_phandle_args args;
	int nodes[2];	/* Max. two GMACs */
	int ret, count;
	int i, node;

	/* Put both GMACs into RESET state. */
	socfpga_per_reset(SOCFPGA_RESET(EMAC0), 1);
	socfpga_per_reset(SOCFPGA_RESET(EMAC1), 1);

	count = fdtdec_find_aliases_for_id(fdt, "ethernet",
					   COMPAT_ALTERA_SOCFPGA_DWMAC,
					   nodes, ARRAY_SIZE(nodes));
	for (i = 0; i < count; i++) {
		node = nodes[i];
		if (node <= 0)
			continue;

		ret = fdtdec_parse_phandle_with_args(fdt, node, "resets",
						     "#reset-cells", 1, 0,
						     &args);
		if (ret || (args.args_count != 1)) {
			debug("GMAC%i: Failed to parse DT 'resets'!\n", i);
			continue;
		}

		dwmac_deassert_reset(args.args[0]);
	}

	return 0;
}
#endif

#ifdef CONFIG_DWMMC
/*
 * Initializes MMC controllers.
 * to override, implement board_mmc_init()
 */
int cpu_mmc_init(bd_t *bis)
{
/*
 * FIXME: Temporarily define CONFIG_HPS_SDMMC_BUSWIDTH to prevent breakage
 *        due to missing patches in u-boot/master . The upcoming patch will
 *        switch this to OF probing, so this whole block will go away.
 */
#define CONFIG_HPS_SDMMC_BUSWIDTH	8
	return socfpga_dwmmc_init(SOCFPGA_SDMMC_ADDRESS,
				  CONFIG_HPS_SDMMC_BUSWIDTH, 0);
}
#endif

struct {
	const char	*mode;
	const char	*name;
} bsel_str[] = {
	{ "rsvd", "Reserved", },
	{ "fpga", "FPGA (HPS2FPGA Bridge)", },
	{ "nand", "NAND Flash (1.8V)", },
	{ "nand", "NAND Flash (3.0V)", },
	{ "sd", "SD/MMC External Transceiver (1.8V)", },
	{ "sd", "SD/MMC Internal Transceiver (3.0V)", },
	{ "qspi", "QSPI Flash (1.8V)", },
	{ "qspi", "QSPI Flash (3.0V)", },
};

/*
 * Print CPU information
 */
#if defined(CONFIG_DISPLAY_CPUINFO)
int print_cpuinfo(void)
{
	const u32 bsel = readl(&sysmgr_regs->bootinfo) & 0x7;
	puts("CPU:   Altera SoCFPGA Platform\n");
	printf("BOOT:  %s\n", bsel_str[bsel].name);
	return 0;
}
#endif

#ifdef CONFIG_ARCH_MISC_INIT
int arch_misc_init(void)
{
	const u32 bsel = readl(&sysmgr_regs->bootinfo) & 0x7;
	setenv("bootmode", bsel_str[bsel].mode);
	return 0;
}
#endif

#if defined(CONFIG_SYS_CONSOLE_IS_IN_ENV) && \
defined(CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE)
int overwrite_console(void)
{
	return 0;
}
#endif

#ifdef CONFIG_FPGA
/*
 * FPGA programming support for SoC FPGA Cyclone V
 */
static Altera_desc altera_fpga[] = {
	{
		/* Family */
		Altera_SoCFPGA,
		/* Interface type */
		fast_passive_parallel,
		/* No limitation as additional data will be ignored */
		-1,
		/* No device function table */
		NULL,
		/* Base interface address specified in driver */
		NULL,
		/* No cookie implementation */
		0
	},
};

/* add device descriptor to FPGA device table */
static void socfpga_fpga_add(void)
{
	int i;
	fpga_init();
	for (i = 0; i < ARRAY_SIZE(altera_fpga); i++)
		fpga_add(fpga_altera, &altera_fpga[i]);
}
#else
static inline void socfpga_fpga_add(void) {}
#endif

int arch_cpu_init(void)
{
#ifdef CONFIG_HW_WATCHDOG
	/*
	 * In case the watchdog is enabled, make sure to (re-)configure it
	 * so that the defined timeout is valid. Otherwise the SPL (Perloader)
	 * timeout value is still active which might too short for Linux
	 * booting.
	 */
	hw_watchdog_init();
#else
	/*
	 * If the HW watchdog is NOT enabled, make sure it is not running,
	 * for example because it was enabled in the preloader. This might
	 * trigger a watchdog-triggered reboot of Linux kernel later.
	 * Toggle watchdog reset, so watchdog in not running state.
	 */
	socfpga_per_reset(SOCFPGA_RESET(L4WD0), 1);
	socfpga_per_reset(SOCFPGA_RESET(L4WD0), 0);
#endif

	return 0;
}

/*
 * Convert all NIC-301 AMBA slaves from secure to non-secure
 */
static void socfpga_nic301_slave_ns(void)
{
	writel(0x1, &nic301_regs->lwhps2fpgaregs);
	writel(0x1, &nic301_regs->hps2fpgaregs);
	writel(0x1, &nic301_regs->acp);
	writel(0x1, &nic301_regs->rom);
	writel(0x1, &nic301_regs->ocram);
	writel(0x1, &nic301_regs->sdrdata);
}

static uint32_t iswgrp_handoff[8];

int arch_early_init_r(void)
{
	int i;

	/*
	 * Write magic value into magic register to unlock support for
	 * issuing warm reset. The ancient kernel code expects this
	 * value to be written into the register by the bootloader, so
	 * to support that old code, we write it here instead of in the
	 * reset_cpu() function just before reseting the CPU.
	 */
	writel(0xae9efebc, &sysmgr_regs->romcodegrp_warmramgrp_enable);

	for (i = 0; i < 8; i++)	/* Cache initial SW setting regs */
		iswgrp_handoff[i] = readl(&sysmgr_regs->iswgrp_handoff[i]);

	socfpga_bridges_reset(1);
	socfpga_nic301_slave_ns();

	/*
	 * Private components security:
	 * U-Boot : configure private timer, global timer and cpu component
	 * access as non secure for kernel stage (as required by Linux)
	 */
	setbits_le32(&scu_regs->sacr, 0xfff);

	/* Configure the L2 controller to make SDRAM start at 0 */
#ifdef CONFIG_SOCFPGA_VIRTUAL_TARGET
	writel(0x2, &nic301_regs->remap);
#else
	writel(0x1, &nic301_regs->remap);	/* remap.mpuzero */
	writel(0x1, &pl310->pl310_addr_filter_start);
#endif

	/* Add device descriptor to FPGA device table */
	socfpga_fpga_add();

#ifdef CONFIG_DESIGNWARE_SPI
	/* Get Designware SPI controller out of reset */
	socfpga_per_reset(SOCFPGA_RESET(SPIM0), 0);
	socfpga_per_reset(SOCFPGA_RESET(SPIM1), 0);
#endif

	return 0;
}

static void socfpga_sdram_apply_static_cfg(void)
{
	const uint32_t staticcfg = SOCFPGA_SDR_ADDRESS + 0x505c;
	const uint32_t applymask = 0x8;
	uint32_t val = readl(staticcfg) | applymask;

	/*
	 * SDRAM staticcfg register specific:
	 * When applying the register setting, the CPU must not access
	 * SDRAM. Luckily for us, we can abuse i-cache here to help us
	 * circumvent the SDRAM access issue. The idea is to make sure
	 * that the code is in one full i-cache line by branching past
	 * it and back. Once it is in the i-cache, we execute the core
	 * of the code and apply the register settings.
	 *
	 * The code below uses 7 instructions, while the Cortex-A9 has
	 * 32-byte cachelines, thus the limit is 8 instructions total.
	 */
	asm volatile(
		".align	5			\n"
		"	b	2f		\n"
		"1:	str	%0,	[%1]	\n"
		"	dsb			\n"
		"	isb			\n"
		"	b	3f		\n"
		"2:	b	1b		\n"
		"3:	nop			\n"
	: : "r"(val), "r"(staticcfg) : "memory", "cc");
}

int do_bridge(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	if (argc != 2)
		return CMD_RET_USAGE;

	argv++;

	switch (*argv[0]) {
	case 'e':	/* Enable */
		writel(iswgrp_handoff[2], &sysmgr_regs->fpgaintfgrp_module);
		socfpga_sdram_apply_static_cfg();
		writel(iswgrp_handoff[3], SOCFPGA_SDR_ADDRESS + 0x5080);
		writel(iswgrp_handoff[0], &reset_manager_base->brg_mod_reset);
		writel(iswgrp_handoff[1], &nic301_regs->remap);
		break;
	case 'd':	/* Disable */
		writel(0, &sysmgr_regs->fpgaintfgrp_module);
		writel(0, SOCFPGA_SDR_ADDRESS + 0x5080);
		socfpga_sdram_apply_static_cfg();
		writel(0, &reset_manager_base->brg_mod_reset);
		writel(1, &nic301_regs->remap);
		break;
	default:
		return CMD_RET_USAGE;
	}

	return 0;
}

U_BOOT_CMD(
	bridge, 2, 1, do_bridge,
	"SoCFPGA HPS FPGA bridge control",
	"enable  - Enable HPS-to-FPGA, FPGA-to-HPS, LWHPS-to-FPGA bridges\n"
	"bridge disable - Enable HPS-to-FPGA, FPGA-to-HPS, LWHPS-to-FPGA bridges\n"
	""
);