arch/arm/mach-msm/peripheral-reset.c

/* Copyright (c) 2010-2012, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/elf.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>

#include <asm/mach-types.h>

#include <mach/scm.h>
#include <mach/msm_iomap.h>

#include "peripheral-loader.h"
#include "scm-pas.h"

#define PPSS_RESET			(MSM_CLK_CTL_BASE + 0x2594)
#define PPSS_PROC_CLK_CTL		(MSM_CLK_CTL_BASE + 0x2588)
#define CLK_HALT_DFAB_STATE		(MSM_CLK_CTL_BASE + 0x2FC8)

static int dsps_start;

static int init_image_dsps_trusted(struct pil_desc *pil, const u8 *metadata,
				   size_t size)
{
	return pas_init_image(PAS_DSPS, metadata, size);
}

static int init_image_dsps_untrusted(struct pil_desc *pil, const u8 *metadata,
				     size_t size)
{
	struct elf32_hdr *ehdr = (struct elf32_hdr *)metadata;
	dsps_start = ehdr->e_entry;
	/* Bring memory and bus interface out of reset */
	__raw_writel(0x2, PPSS_RESET);
	mb();
	return 0;
}

static int verify_blob(struct pil_desc *pil, u32 phy_addr, size_t size)
{
	return 0;
}

static int reset_dsps_untrusted(struct pil_desc *pil)
{
	__raw_writel(0x10, PPSS_PROC_CLK_CTL);
	while (__raw_readl(CLK_HALT_DFAB_STATE) & BIT(18))
		cpu_relax();

	/* Bring DSPS out of reset */
	__raw_writel(0x0, PPSS_RESET);
	return 0;
}

static int reset_dsps_trusted(struct pil_desc *pil)
{
	return pas_auth_and_reset(PAS_DSPS);
}

static int shutdown_dsps_trusted(struct pil_desc *pil)
{
	return pas_shutdown(PAS_DSPS);
}

static int shutdown_dsps_untrusted(struct pil_desc *pil)
{
	__raw_writel(0x3, PPSS_RESET);
	__raw_writel(0x0, PPSS_PROC_CLK_CTL);
	return 0;
}

struct pil_reset_ops pil_dsps_ops = {
	.init_image = init_image_dsps_untrusted,
	.verify_blob = verify_blob,
	.auth_and_reset = reset_dsps_untrusted,
	.shutdown = shutdown_dsps_untrusted,
};

static struct platform_device pil_dsps = {
	.name = "pil_dsps",
};

static struct pil_desc pil_dsps_desc = {
	.name = "dsps",
	.dev = &pil_dsps.dev,
	.ops = &pil_dsps_ops,
	.owner = THIS_MODULE,
};

static int __init msm_peripheral_reset_init(void)
{
	if (pas_supported(PAS_DSPS) > 0) {
		pil_dsps_ops.init_image = init_image_dsps_trusted;
		pil_dsps_ops.auth_and_reset = reset_dsps_trusted;
		pil_dsps_ops.shutdown = shutdown_dsps_trusted;
	}

	if (machine_is_msm8x60_fluid())
		pil_dsps_desc.name = "dsps_fluid";
	BUG_ON(platform_device_register(&pil_dsps));
	BUG_ON(IS_ERR(msm_pil_register(&pil_dsps_desc)));

	return 0;
}

module_init(msm_peripheral_reset_init);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Validate and bring peripherals out of reset");