drivers/net/fsl_mc/mc.c

/*
 * Copyright (C) 2014 Freescale Semiconductor
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
#include <errno.h>
#include <asm/io.h>
#include <fsl_mc.h>

DECLARE_GLOBAL_DATA_PTR;
static int mc_boot_status;

/**
 * Copying MC firmware or DPL image to DDR
 */
static int mc_copy_image(const char *title,
		    u64 image_addr, u32 image_size, u64 mc_ram_addr)
{
	debug("%s copied to address %p\n", title, (void *)mc_ram_addr);
	memcpy((void *)mc_ram_addr, (void *)image_addr, image_size);
	return 0;
}

/**
 * MC firmware FIT image parser checks if the image is in FIT
 * format, verifies integrity of the image and calculates
 * raw image address and size values.
 * Returns 0 if success and 1 if any of the above mentioned
 * task fail.
 **/

int parse_mc_firmware_fit_image(const void **raw_image_addr,
				size_t *raw_image_size)
{
	int format;
	void *fit_hdr;
	int node_offset;
	const void *data;
	size_t size;
	const char *uname = "firmware";

	/* Check if the image is in NOR flash*/
#ifdef CONFIG_SYS_LS_MC_FW_IN_NOR
	fit_hdr = (void *)CONFIG_SYS_LS_MC_FW_ADDR;
#else
#error "No CONFIG_SYS_LS_MC_FW_IN_xxx defined"
#endif

	/* Check if Image is in FIT format */
	format = genimg_get_format(fit_hdr);

	if (format != IMAGE_FORMAT_FIT) {
		debug("Not a FIT image\n");
		return 1;
	}

	if (!fit_check_format(fit_hdr)) {
		debug("Bad FIT image format\n");
		return 1;
	}

	node_offset = fit_image_get_node(fit_hdr, uname);

	if (node_offset < 0) {
		debug("Can not find %s subimage\n", uname);
		return 1;
	}

	/* Verify MC firmware image */
	if (!(fit_image_verify(fit_hdr, node_offset))) {
		debug("Bad MC firmware hash");
		return 1;
	}

	/* Get address and size of raw image */
	fit_image_get_data(fit_hdr, node_offset, &data, &size);

	*raw_image_addr = data;
	*raw_image_size = size;

	return 0;
}

int mc_init(bd_t *bis)
{
	int error = 0;
	int timeout = 200000;
	struct mc_ccsr_registers __iomem *mc_ccsr_regs = MC_CCSR_BASE_ADDR;
	u64 mc_ram_addr;
	u64 mc_dpl_offset;
	u32 reg_gsr;
	u32 mc_fw_boot_status;
	void *fdt_hdr;
	int dpl_size;
	const void *raw_image_addr;
	size_t raw_image_size = 0;

	BUILD_BUG_ON(CONFIG_SYS_LS_MC_FW_LENGTH % 4 != 0);

	/*
	 * The MC private DRAM block was already carved at the end of DRAM
	 * by board_init_f() using CONFIG_SYS_MEM_TOP_HIDE:
	 */
	if (gd->bd->bi_dram[1].start) {
		mc_ram_addr =
			gd->bd->bi_dram[1].start + gd->bd->bi_dram[1].size;
	} else {
		mc_ram_addr =
			gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size;
	}

	/*
	 * Management Complex cores should be held at reset out of POR.
	 * U-boot should be the first software to touch MC. To be safe,
	 * we reset all cores again by setting GCR1 to 0. It doesn't do
	 * anything if they are held at reset. After we setup the firmware
	 * we kick off MC by deasserting the reset bit for core 0, and
	 * deasserting the reset bits for Command Portal Managers.
	 * The stop bits are not touched here. They are used to stop the
	 * cores when they are active. Setting stop bits doesn't stop the
	 * cores from fetching instructions when they are released from
	 * reset.
	 */
	out_le32(&mc_ccsr_regs->reg_gcr1, 0);
	dmb();

	error = parse_mc_firmware_fit_image(&raw_image_addr, &raw_image_size);
	if (error != 0)
		goto out;
	/*
	 * Load the MC FW at the beginning of the MC private DRAM block:
	 */
	mc_copy_image(
		"MC Firmware",
		(u64)raw_image_addr,
		raw_image_size,
		mc_ram_addr);

	/*
	 * Calculate offset in the MC private DRAM block at which the MC DPL
	 * blob is to be placed:
	 */
#ifdef CONFIG_SYS_LS_MC_DRAM_DPL_OFFSET
	BUILD_BUG_ON(
		(CONFIG_SYS_LS_MC_DRAM_DPL_OFFSET & 0x3) != 0 ||
		CONFIG_SYS_LS_MC_DRAM_DPL_OFFSET > 0xffffffff);

	mc_dpl_offset = CONFIG_SYS_LS_MC_DRAM_DPL_OFFSET;
#else
	mc_dpl_offset = mc_get_dram_block_size() -
			roundup(CONFIG_SYS_LS_MC_DPL_LENGTH, 4096);

	if ((mc_dpl_offset & 0x3) != 0 || mc_dpl_offset > 0xffffffff) {
		printf("%s: Invalid MC DPL offset: %llu\n",
		       __func__, mc_dpl_offset);
		error = -EINVAL;
		goto out;
	}
#endif

	/* Check if DPL image is in NOR flash */
#ifdef CONFIG_SYS_LS_MC_DPL_IN_NOR
	fdt_hdr = (void *)CONFIG_SYS_LS_MC_DPL_ADDR;
#else
#error "No CONFIG_SYS_LS_MC_DPL_IN_xxx defined"
#endif

	dpl_size = fdt_totalsize(fdt_hdr);

	/*
	 * Load the MC DPL blob at the far end of the MC private DRAM block:
	 */
	mc_copy_image(
		"MC DPL blob",
		(u64)fdt_hdr,
		dpl_size,
		mc_ram_addr + mc_dpl_offset);

	debug("mc_ccsr_regs %p\n", mc_ccsr_regs);

	/*
	 * Tell MC where the MC Firmware image was loaded in DDR:
	 */
	out_le32(&mc_ccsr_regs->reg_mcfbalr, (u32)mc_ram_addr);
	out_le32(&mc_ccsr_regs->reg_mcfbahr, (u32)((u64)mc_ram_addr >> 32));
	out_le32(&mc_ccsr_regs->reg_mcfapr, MCFAPR_BYPASS_ICID_MASK);

	/*
	 * Tell MC where the DPL blob was loaded in DDR, by indicating
	 * its offset relative to the beginning of the DDR block
	 * allocated to the MC firmware. The MC firmware is responsible
	 * for checking that there is no overlap between the DPL blob
	 * and the runtime heap and stack of the MC firmware itself.
	 *
	 * NOTE: bits [31:2] of this offset need to be stored in bits [29:0] of
	 * the GSR MC CCSR register. So, this offset is assumed to be 4-byte
	 * aligned.
	 * Care must be taken not to write 1s into bits 31 and 30 of the GSR in
	 * this case as the SoC COP or PIC will be signaled.
	 */
	out_le32(&mc_ccsr_regs->reg_gsr, (u32)(mc_dpl_offset >> 2));

	/*
	 * Deassert reset and release MC core 0 to run
	 */
	out_le32(&mc_ccsr_regs->reg_gcr1, GCR1_P1_DE_RST | GCR1_M_ALL_DE_RST);
	dmb();
	debug("Polling mc_ccsr_regs->reg_gsr ...\n");

	for (;;) {
		reg_gsr = in_le32(&mc_ccsr_regs->reg_gsr);
		mc_fw_boot_status = (reg_gsr & GSR_FS_MASK);
		if (mc_fw_boot_status & 0x1)
			break;

		udelay(1000);	/* throttle polling */
		if (timeout-- <= 0)
			break;
	}

	if (timeout <= 0) {
		printf("%s: timeout booting management complex firmware\n",
		       __func__);

		/* TODO: Get an error status from an MC CCSR register */
		error = -ETIMEDOUT;
		goto out;
	}

	printf("Management complex booted (boot status: %#x)\n",
	       mc_fw_boot_status);

	if (mc_fw_boot_status != 0x1) {
		/*
		 * TODO: Identify critical errors from the GSR register's FS
		 * field and for those errors, set error to -ENODEV or other
		 * appropriate errno, so that the status property is set to
		 * failure in the fsl,dprc device tree node.
		 */
	}

out:
	if (error != 0)
		mc_boot_status = -error;
	else
		mc_boot_status = 0;

	return error;
}

int get_mc_boot_status(void)
{
	return mc_boot_status;
}

/**
 * Return the actual size of the MC private DRAM block.
 *
 * NOTE: For now this function always returns the minimum required size,
 * However, in the future, the actual size may be obtained from an environment
 * variable.
 */
unsigned long mc_get_dram_block_size(void)
{
	return CONFIG_SYS_LS_MC_DRAM_BLOCK_MIN_SIZE;
}