106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
|
/*
|
||
|
|
* AMD Platform Security Processor (PSP) interface
|
||
|
|
*
|
||
|
|
* Copyright (C) 2016-2017 Advanced Micro Devices, Inc.
|
||
|
|
*
|
||
|
|
* Author: Brijesh Singh <brijesh.singh@amd.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/kthread.h>
|
||
|
|
#include <linux/sched.h>
|
||
|
|
#include <linux/interrupt.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <linux/spinlock_types.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/mutex.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/hw_random.h>
|
||
|
|
#include <linux/ccp.h>
|
||
|
|
|
||
|
|
#include "sp-dev.h"
|
||
|
|
#include "psp-dev.h"
|
||
|
|
|
||
|
|
static struct psp_device *psp_alloc_struct(struct sp_device *sp)
|
||
|
|
{
|
||
|
|
struct device *dev = sp->dev;
|
||
|
|
struct psp_device *psp;
|
||
|
|
|
||
|
|
psp = devm_kzalloc(dev, sizeof(*psp), GFP_KERNEL);
|
||
|
|
if (!psp)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
psp->dev = dev;
|
||
|
|
psp->sp = sp;
|
||
|
|
|
||
|
|
snprintf(psp->name, sizeof(psp->name), "psp-%u", sp->ord);
|
||
|
|
|
||
|
|
return psp;
|
||
|
|
}
|
||
|
|
|
||
|
|
static irqreturn_t psp_irq_handler(int irq, void *data)
|
||
|
|
{
|
||
|
|
return IRQ_HANDLED;
|
||
|
|
}
|
||
|
|
|
||
|
|
int psp_dev_init(struct sp_device *sp)
|
||
|
|
{
|
||
|
|
struct device *dev = sp->dev;
|
||
|
|
struct psp_device *psp;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = -ENOMEM;
|
||
|
|
psp = psp_alloc_struct(sp);
|
||
|
|
if (!psp)
|
||
|
|
goto e_err;
|
||
|
|
|
||
|
|
sp->psp_data = psp;
|
||
|
|
|
||
|
|
psp->vdata = (struct psp_vdata *)sp->dev_vdata->psp_vdata;
|
||
|
|
if (!psp->vdata) {
|
||
|
|
ret = -ENODEV;
|
||
|
|
dev_err(dev, "missing driver data\n");
|
||
|
|
goto e_err;
|
||
|
|
}
|
||
|
|
|
||
|
|
psp->io_regs = sp->io_map + psp->vdata->offset;
|
||
|
|
|
||
|
|
/* Disable and clear interrupts until ready */
|
||
|
|
iowrite32(0, psp->io_regs + PSP_P2CMSG_INTEN);
|
||
|
|
iowrite32(-1, psp->io_regs + PSP_P2CMSG_INTSTS);
|
||
|
|
|
||
|
|
/* Request an irq */
|
||
|
|
ret = sp_request_psp_irq(psp->sp, psp_irq_handler, psp->name, psp);
|
||
|
|
if (ret) {
|
||
|
|
dev_err(dev, "psp: unable to allocate an IRQ\n");
|
||
|
|
goto e_err;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (sp->set_psp_master_device)
|
||
|
|
sp->set_psp_master_device(sp);
|
||
|
|
|
||
|
|
/* Enable interrupt */
|
||
|
|
iowrite32(-1, psp->io_regs + PSP_P2CMSG_INTEN);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
e_err:
|
||
|
|
sp->psp_data = NULL;
|
||
|
|
|
||
|
|
dev_notice(dev, "psp initialization failed\n");
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
void psp_dev_destroy(struct sp_device *sp)
|
||
|
|
{
|
||
|
|
struct psp_device *psp = sp->psp_data;
|
||
|
|
|
||
|
|
sp_free_psp_irq(sp, psp);
|
||
|
|
}
|