linux/drivers/gpu/host1x/hw/intr_hw.c

153 lines
4.2 KiB
C
Raw Normal View History

/*
* Tegra host1x Interrupt Management
*
* Copyright (C) 2010 Google, Inc.
* Copyright (c) 2010-2013, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include "../intr.h"
#include "../dev.h"
/*
* Sync point threshold interrupt service function
* Handles sync point threshold triggers, in interrupt context
*/
static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt)
{
unsigned int id = syncpt->id;
struct host1x *host = syncpt->host;
host1x_sync_writel(host, BIT_MASK(id),
HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(BIT_WORD(id)));
host1x_sync_writel(host, BIT_MASK(id),
HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(BIT_WORD(id)));
schedule_work(&syncpt->intr.work);
}
static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
{
struct host1x *host = dev_id;
unsigned long reg;
unsigned int i, id;
for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) {
reg = host1x_sync_readl(host,
HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
for_each_set_bit(id, &reg, BITS_PER_LONG) {
struct host1x_syncpt *syncpt =
host->syncpt + (i * BITS_PER_LONG + id);
host1x_intr_syncpt_handle(syncpt);
}
}
return IRQ_HANDLED;
}
static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
{
unsigned int i;
for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); ++i) {
host1x_sync_writel(host, 0xffffffffu,
HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
host1x_sync_writel(host, 0xffffffffu,
HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
}
}
static int
_host1x_intr_init_host_sync(struct host1x *host, u32 cpm,
void (*syncpt_thresh_work)(struct work_struct *))
{
unsigned int i;
int err;
host1x_hw_intr_disable_all_syncpt_intrs(host);
for (i = 0; i < host->info->nb_pts; i++)
INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work);
err = devm_request_irq(host->dev, host->intr_syncpt_irq,
syncpt_thresh_isr, IRQF_SHARED,
"host1x_syncpt", host);
remove lots of IS_ERR_VALUE abuses Most users of IS_ERR_VALUE() in the kernel are wrong, as they pass an 'int' into a function that takes an 'unsigned long' argument. This happens to work because the type is sign-extended on 64-bit architectures before it gets converted into an unsigned type. However, anything that passes an 'unsigned short' or 'unsigned int' argument into IS_ERR_VALUE() is guaranteed to be broken, as are 8-bit integers and types that are wider than 'unsigned long'. Andrzej Hajda has already fixed a lot of the worst abusers that were causing actual bugs, but it would be nice to prevent any users that are not passing 'unsigned long' arguments. This patch changes all users of IS_ERR_VALUE() that I could find on 32-bit ARM randconfig builds and x86 allmodconfig. For the moment, this doesn't change the definition of IS_ERR_VALUE() because there are probably still architecture specific users elsewhere. Almost all the warnings I got are for files that are better off using 'if (err)' or 'if (err < 0)'. The only legitimate user I could find that we get a warning for is the (32-bit only) freescale fman driver, so I did not remove the IS_ERR_VALUE() there but changed the type to 'unsigned long'. For 9pfs, I just worked around one user whose calling conventions are so obscure that I did not dare change the behavior. I was using this definition for testing: #define IS_ERR_VALUE(x) ((unsigned long*)NULL == (typeof (x)*)NULL && \ unlikely((unsigned long long)(x) >= (unsigned long long)(typeof(x))-MAX_ERRNO)) which ends up making all 16-bit or wider types work correctly with the most plausible interpretation of what IS_ERR_VALUE() was supposed to return according to its users, but also causes a compile-time warning for any users that do not pass an 'unsigned long' argument. I suggested this approach earlier this year, but back then we ended up deciding to just fix the users that are obviously broken. After the initial warning that caused me to get involved in the discussion (fs/gfs2/dir.c) showed up again in the mainline kernel, Linus asked me to send the whole thing again. [ Updated the 9p parts as per Al Viro - Linus ] Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Andrzej Hajda <a.hajda@samsung.com> Cc: Andrew Morton <akpm@linux-foundation.org> Link: https://lkml.org/lkml/2016/1/7/363 Link: https://lkml.org/lkml/2016/5/27/486 Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> # For nvmem part Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-28 05:23:25 +08:00
if (err < 0) {
WARN_ON(1);
return err;
}
/* disable the ip_busy_timeout. this prevents write drops */
host1x_sync_writel(host, 0, HOST1X_SYNC_IP_BUSY_TIMEOUT);
/*
* increase the auto-ack timout to the maximum value. 2d will hang
* otherwise on Tegra2.
*/
host1x_sync_writel(host, 0xff, HOST1X_SYNC_CTXSW_TIMEOUT_CFG);
/* update host clocks per usec */
host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK);
return 0;
}
static void _host1x_intr_set_syncpt_threshold(struct host1x *host,
unsigned int id,
u32 thresh)
{
host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id));
}
static void _host1x_intr_enable_syncpt_intr(struct host1x *host,
unsigned int id)
{
host1x_sync_writel(host, BIT_MASK(id),
HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(BIT_WORD(id)));
}
static void _host1x_intr_disable_syncpt_intr(struct host1x *host,
unsigned int id)
{
host1x_sync_writel(host, BIT_MASK(id),
HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(BIT_WORD(id)));
host1x_sync_writel(host, BIT_MASK(id),
HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(BIT_WORD(id)));
}
static int _host1x_free_syncpt_irq(struct host1x *host)
{
unsigned int i;
devm_free_irq(host->dev, host->intr_syncpt_irq, host);
for (i = 0; i < host->info->nb_pts; i++)
cancel_work_sync(&host->syncpt[i].intr.work);
return 0;
}
static const struct host1x_intr_ops host1x_intr_ops = {
.init_host_sync = _host1x_intr_init_host_sync,
.set_syncpt_threshold = _host1x_intr_set_syncpt_threshold,
.enable_syncpt_intr = _host1x_intr_enable_syncpt_intr,
.disable_syncpt_intr = _host1x_intr_disable_syncpt_intr,
.disable_all_syncpt_intrs = _host1x_intr_disable_all_syncpt_intrs,
.free_syncpt_irq = _host1x_free_syncpt_irq,
};