/*
* OMAP4XXX L3 Interconnect error handling driver
*
* Copyright (C) 2011 Texas Corporation
* Santosh Shilimkar <santosh.shilimkar@ti.com>
* Sricharan <r.sricharan@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include "omap_l3_noc.h"
/*
* Interrupt Handler for L3 error detection.
* 1) Identify the L3 clockdomain partition to which the error belongs to.
* 2) Identify the slave where the error information is logged
* 3) Print the logged information.
* 4) Add dump stack to provide kernel trace.
*
* Two Types of errors :
* 1) Custom errors in L3 :
* Target like DMM/FW/EMIF generates SRESP=ERR error
* 2) Standard L3 error:
* - Unsupported CMD.
* L3 tries to access target while it is idle
* - OCP disconnect.
* - Address hole error:
* If DSS/ISS/FDIF/USBHOSTFS access a target where they
* do not have connectivity, the error is logged in
* their default target which is DMM2.
*
* On High Secure devices, firewall errors are possible and those
* can be trapped as well. But the trapping is implemented as part
* secure software and hence need not be implemented here.
*/
static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
{
struct omap4_l3 *l3 = _l3;
int inttype, i, j;
int err_src = 0;
u32 std_err_main_addr, std_err_main, err_reg;
u32 base, slave_addr, clear;
char *source_name;
/* Get the Type of interrupt */
if (irq == l3->app_irq)
inttype = L3_APPLICATION_ERROR;
else
inttype = L3_DEBUG_ERROR;
for (i = 0; i < L3_MODULES; i++) {
/*
* Read the regerr register of the clock domain
* to determine the source
*/
base = (u32)l3->l3_base[i];
err_reg = readl(base + l3_flagmux[i] + (inttype << 3));
/* Get the corresponding error and analyse */
if (err_reg) {
/* Identify the source from control status register */
for (j = 0; !(err_reg & (1 << j)); j++)
;
err_src = j;
/* Read the stderrlog_main_source from clk domain */
std_err_main_addr = base + (*(l3_targ[i] + err_src));
std_err_main = readl(std_err_main_addr);
switch ((std_err_main & CUSTOM_ERROR)) {
case STANDARD_ERROR:
source_name =
l3_targ_stderrlog_main_name[i][err_src];
slave_addr = std_err_main_addr +
L3_SLAVE_ADDRESS_OFFSET;
WARN(true, "L3 standard error: SOURCE:%s at address 0x%x\n",
source_name, readl(slave_addr));
/* clear the std error log*/
clear = std_err_main | CLEAR_STDERR_LOG;
writel(clear, std_err_main_addr);
break;
case CUSTOM_ERROR:
source_name =
l3_targ_stderrlog_main_name[i][err_src];
WARN(true, "CUSTOM SRESP error with SOURCE:%s\n",
source_name);
/* clear the std error log*/
clear = std_err_main | CLEAR_STDERR_LOG;
writel(clear, std_err_main_addr);
break;
default:
/* Nothing to be handled here as of now */
break;
}
/* Error found so break the for loop */
break;
}
}
return IRQ_HANDLED;
}
static int __init omap4_l3_probe(struct platform_device *pdev)
{
static struct omap4_l3 *l3;
struct resource *res;
int ret;
int irq;
l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
if (!l3)
ret = -ENOMEM;
platform_set_drvdata(pdev, l3);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "couldn't find resource 0\n");
ret = -ENODEV;
goto err1;
}
l3->l3_base[0] = ioremap(res->start, resource_size(res));
if (!(l3->l3_base[0])) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err2;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(&pdev->dev, "couldn't find resource 1\n");
ret = -ENODEV;
goto err3;
}
l3->l3_base[1] = ioremap(res->start, resource_size(res));
if (!(l3->l3_base[1])) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err4;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
if (!res) {
dev_err(&pdev->dev, "couldn't find resource 2\n");
ret = -ENODEV;
goto err5;
}
l3->l3_base[2] = ioremap(res->start, resource_size(res));
if (!(l3->l3_base[2])) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err6;
}
/*
* Setup interrupt Handlers
*/
irq = platform_get_irq(pdev, 0);
ret = request_irq(irq,
l3_interrupt_handler,
IRQF_DISABLED, "l3-dbg-irq", l3);
if (ret) {
pr_crit("L3: request_irq failed to register for 0x%x\n",
OMAP44XX_IRQ_L3_DBG);
goto err7;
}
l3->debug_irq = irq;
irq = platform_get_irq(pdev, 1);
ret = request_irq(irq,
l3_interrupt_handler,
IRQF_DISABLED, "l3-app-irq", l3);
if (ret) {
pr_crit("L3: request_irq failed to register for 0x%x\n",
OMAP44XX_IRQ_L3_APP);
goto err8;
}
l3->app_irq = irq;
goto err0;
err8:
err7:
iounmap(l3->l3_base[2]);
err6:
err5:
iounmap(l3->l3_base[1]);
err4:
err3:
iounmap(l3->l3_base[0]);
err2:
err1:
kfree(l3);
err0:
return ret;
}
static int __exit omap4_l3_remove(struct platform_device *pdev)
{
struct omap4_l3 *l3 = platform_get_drvdata(pdev);
free_irq(l3->app_irq, l3);
free_irq(l3->debug_irq, l3);
iounmap(l3->l3_base[0]);
iounmap(l3->l3_base[1]);
iounmap(l3->l3_base[2]);
kfree(l3);
return 0;
}
static struct platform_driver omap4_l3_driver = {
.remove = __exit_p(omap4_l3_remove),
.driver = {
.name = "omap_l3_noc",
},
};
static int __init omap4_l3_init(void)
{
return platform_driver_probe(&omap4_l3_driver, omap4_l3_probe);
}
postcore_initcall_sync(omap4_l3_init);
static void __exit omap4_l3_exit(void)
{
platform_driver_unregister(&omap4_l3_driver);
}
module_exit(omap4_l3_exit);