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linux/drivers/bus/omap_l3_smx.c

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/*
* OMAP3XXX L3 Interconnect Driver
*
* Copyright (C) 2011 Texas Corporation
* Felipe Balbi <balbi@ti.com>
* 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/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include "omap_l3_smx.h"
static inline u64 omap3_l3_readll(void __iomem *base, u16 reg)
{
return __raw_readll(base + reg);
}
static inline void omap3_l3_writell(void __iomem *base, u16 reg, u64 value)
{
__raw_writell(value, base + reg);
}
static inline enum omap3_l3_code omap3_l3_decode_error_code(u64 error)
{
return (error & 0x0f000000) >> L3_ERROR_LOG_CODE;
}
static inline u32 omap3_l3_decode_addr(u64 error_addr)
{
return error_addr & 0xffffffff;
}
static inline unsigned omap3_l3_decode_cmd(u64 error)
{
return (error & 0x07) >> L3_ERROR_LOG_CMD;
}
static inline enum omap3_l3_initiator_id omap3_l3_decode_initid(u64 error)
{
return (error & 0xff00) >> L3_ERROR_LOG_INITID;
}
static inline unsigned omap3_l3_decode_req_info(u64 error)
{
return (error >> 32) & 0xffff;
}
static char *omap3_l3_code_string(u8 code)
{
switch (code) {
case OMAP_L3_CODE_NOERROR:
return "No Error";
case OMAP_L3_CODE_UNSUP_CMD:
return "Unsupported Command";
case OMAP_L3_CODE_ADDR_HOLE:
return "Address Hole";
case OMAP_L3_CODE_PROTECT_VIOLATION:
return "Protection Violation";
case OMAP_L3_CODE_IN_BAND_ERR:
return "In-band Error";
case OMAP_L3_CODE_REQ_TOUT_NOT_ACCEPT:
return "Request Timeout Not Accepted";
case OMAP_L3_CODE_REQ_TOUT_NO_RESP:
return "Request Timeout, no response";
default:
return "UNKNOWN error";
}
}
static char *omap3_l3_initiator_string(u8 initid)
{
switch (initid) {
case OMAP_L3_LCD:
return "LCD";
case OMAP_L3_SAD2D:
return "SAD2D";
case OMAP_L3_IA_MPU_SS_1:
case OMAP_L3_IA_MPU_SS_2:
case OMAP_L3_IA_MPU_SS_3:
case OMAP_L3_IA_MPU_SS_4:
case OMAP_L3_IA_MPU_SS_5:
return "MPU";
case OMAP_L3_IA_IVA_SS_1:
case OMAP_L3_IA_IVA_SS_2:
case OMAP_L3_IA_IVA_SS_3:
return "IVA_SS";
case OMAP_L3_IA_IVA_SS_DMA_1:
case OMAP_L3_IA_IVA_SS_DMA_2:
case OMAP_L3_IA_IVA_SS_DMA_3:
case OMAP_L3_IA_IVA_SS_DMA_4:
case OMAP_L3_IA_IVA_SS_DMA_5:
case OMAP_L3_IA_IVA_SS_DMA_6:
return "IVA_SS_DMA";
case OMAP_L3_IA_SGX:
return "SGX";
case OMAP_L3_IA_CAM_1:
case OMAP_L3_IA_CAM_2:
case OMAP_L3_IA_CAM_3:
return "CAM";
case OMAP_L3_IA_DAP:
return "DAP";
case OMAP_L3_SDMA_WR_1:
case OMAP_L3_SDMA_WR_2:
return "SDMA_WR";
case OMAP_L3_SDMA_RD_1:
case OMAP_L3_SDMA_RD_2:
case OMAP_L3_SDMA_RD_3:
case OMAP_L3_SDMA_RD_4:
return "SDMA_RD";
case OMAP_L3_USBOTG:
return "USB_OTG";
case OMAP_L3_USBHOST:
return "USB_HOST";
default:
return "UNKNOWN Initiator";
}
}
/*
* omap3_l3_block_irq - handles a register block's irq
* @l3: struct omap3_l3 *
* @base: register block base address
* @error: L3_ERROR_LOG register of our block
*
* Called in hard-irq context. Caller should take care of locking
*
* OMAP36xx TRM gives, on page 2001, Figure 9-10, the Typical Error
* Analysis Sequence, we are following that sequence here, please
* refer to that Figure for more information on the subject.
*/
static irqreturn_t omap3_l3_block_irq(struct omap3_l3 *l3,
u64 error, int error_addr)
{
u8 code = omap3_l3_decode_error_code(error);
u8 initid = omap3_l3_decode_initid(error);
u8 multi = error & L3_ERROR_LOG_MULTI;
u32 address = omap3_l3_decode_addr(error_addr);
pr_err("%s seen by %s %s at address %x\n",
omap3_l3_code_string(code),
omap3_l3_initiator_string(initid),
multi ? "Multiple Errors" : "", address);
WARN_ON(1);
return IRQ_HANDLED;
}
static irqreturn_t omap3_l3_app_irq(int irq, void *_l3)
{
struct omap3_l3 *l3 = _l3;
u64 status, clear;
u64 error;
u64 error_addr;
u64 err_source = 0;
void __iomem *base;
int int_type;
irqreturn_t ret = IRQ_NONE;
int_type = irq == l3->app_irq ? L3_APPLICATION_ERROR : L3_DEBUG_ERROR;
if (!int_type) {
status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_0);
/*
* if we have a timeout error, there's nothing we can
* do besides rebooting the board. So let's BUG on any
* of such errors and handle the others. timeout error
* is severe and not expected to occur.
*/
BUG_ON(status & L3_STATUS_0_TIMEOUT_MASK);
} else {
status = omap3_l3_readll(l3->rt, L3_SI_FLAG_STATUS_1);
/* No timeout error for debug sources */
}
/* identify the error source */
err_source = __ffs(status);
base = l3->rt + omap3_l3_bases[int_type][err_source];
error = omap3_l3_readll(base, L3_ERROR_LOG);
if (error) {
error_addr = omap3_l3_readll(base, L3_ERROR_LOG_ADDR);
ret |= omap3_l3_block_irq(l3, error, error_addr);
}
/* Clear the status register */
clear = (L3_AGENT_STATUS_CLEAR_IA << int_type) |
L3_AGENT_STATUS_CLEAR_TA;
omap3_l3_writell(base, L3_AGENT_STATUS, clear);
/* clear the error log register */
omap3_l3_writell(base, L3_ERROR_LOG, error);
return ret;
}
static int __init omap3_l3_probe(struct platform_device *pdev)
{
struct omap3_l3 *l3;
struct resource *res;
int ret;
l3 = kzalloc(sizeof(*l3), GFP_KERNEL);
if (!l3)
return -ENOMEM;
platform_set_drvdata(pdev, l3);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "couldn't find resource\n");
ret = -ENODEV;
goto err0;
}
l3->rt = ioremap(res->start, resource_size(res));
if (!l3->rt) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto err0;
}
l3->debug_irq = platform_get_irq(pdev, 0);
ret = request_irq(l3->debug_irq, omap3_l3_app_irq,
IRQF_DISABLED | IRQF_TRIGGER_RISING,
"l3-debug-irq", l3);
if (ret) {
dev_err(&pdev->dev, "couldn't request debug irq\n");
goto err1;
}
l3->app_irq = platform_get_irq(pdev, 1);
ret = request_irq(l3->app_irq, omap3_l3_app_irq,
IRQF_DISABLED | IRQF_TRIGGER_RISING,
"l3-app-irq", l3);
if (ret) {
dev_err(&pdev->dev, "couldn't request app irq\n");
goto err2;
}
return 0;
err2:
free_irq(l3->debug_irq, l3);
err1:
iounmap(l3->rt);
err0:
kfree(l3);
return ret;
}
static int __exit omap3_l3_remove(struct platform_device *pdev)
{
struct omap3_l3 *l3 = platform_get_drvdata(pdev);
free_irq(l3->app_irq, l3);
free_irq(l3->debug_irq, l3);
iounmap(l3->rt);
kfree(l3);
return 0;
}
static struct platform_driver omap3_l3_driver = {
.remove = __exit_p(omap3_l3_remove),
.driver = {
.name = "omap_l3_smx",
},
};
static int __init omap3_l3_init(void)
{
return platform_driver_probe(&omap3_l3_driver, omap3_l3_probe);
}
postcore_initcall_sync(omap3_l3_init);
static void __exit omap3_l3_exit(void)
{
platform_driver_unregister(&omap3_l3_driver);
}
module_exit(omap3_l3_exit);
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