// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ispstat.c
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*
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* TI OMAP3 ISP - Statistics core
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*
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* Copyright (C) 2010 Nokia Corporation
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* Copyright (C) 2009 Texas Instruments, Inc
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*
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* Contacts: David Cohen <dacohen@gmail.com>
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* Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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* Sakari Ailus <sakari.ailus@iki.fi>
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*/
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#include <linux/dma-mapping.h>
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#include <linux/slab.h>
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#include <linux/timekeeping.h>
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#include <linux/uaccess.h>
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#include "isp.h"
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#define ISP_STAT_USES_DMAENGINE(stat) ((stat)->dma_ch != NULL)
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/*
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* MAGIC_SIZE must always be the greatest common divisor of
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* AEWB_PACKET_SIZE and AF_PAXEL_SIZE.
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*/
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#define MAGIC_SIZE 16
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#define MAGIC_NUM 0x55
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/* HACK: AF module seems to be writing one more paxel data than it should. */
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#define AF_EXTRA_DATA OMAP3ISP_AF_PAXEL_SIZE
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/*
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* HACK: H3A modules go to an invalid state after have a SBL overflow. It makes
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* the next buffer to start to be written in the same point where the overflow
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* occurred instead of the configured address. The only known way to make it to
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* go back to a valid state is having a valid buffer processing. Of course it
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* requires at least a doubled buffer size to avoid an access to invalid memory
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* region. But it does not fix everything. It may happen more than one
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* consecutive SBL overflows. In that case, it might be unpredictable how many
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* buffers the allocated memory should fit. For that case, a recover
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* configuration was created. It produces the minimum buffer size for each H3A
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* module and decrease the change for more SBL overflows. This recover state
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* will be enabled every time a SBL overflow occur. As the output buffer size
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* isn't big, it's possible to have an extra size able to fit many recover
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* buffers making it extreamily unlikely to have an access to invalid memory
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* region.
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*/
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#define NUM_H3A_RECOVER_BUFS 10
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/*
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* HACK: Because of HW issues the generic layer sometimes need to have
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* different behaviour for different statistic modules.
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*/
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#define IS_H3A_AF(stat) ((stat) == &(stat)->isp->isp_af)
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#define IS_H3A_AEWB(stat) ((stat) == &(stat)->isp->isp_aewb)
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#define IS_H3A(stat) (IS_H3A_AF(stat) || IS_H3A_AEWB(stat))
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static void __isp_stat_buf_sync_magic(struct ispstat *stat,
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struct ispstat_buffer *buf,
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u32 buf_size, enum dma_data_direction dir,
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void (*dma_sync)(struct device *,
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dma_addr_t, unsigned long, size_t,
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enum dma_data_direction))
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{
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/* Sync the initial and final magic words. */
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dma_sync(stat->isp->dev, buf->dma_addr, 0, MAGIC_SIZE, dir);
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dma_sync(stat->isp->dev, buf->dma_addr + (buf_size & PAGE_MASK),
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buf_size & ~PAGE_MASK, MAGIC_SIZE, dir);
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}
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static void isp_stat_buf_sync_magic_for_device(struct ispstat *stat,
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struct ispstat_buffer *buf,
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u32 buf_size,
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enum dma_data_direction dir)
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{
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if (ISP_STAT_USES_DMAENGINE(stat))
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return;
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__isp_stat_buf_sync_magic(stat, buf, buf_size, dir,
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dma_sync_single_range_for_device);
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}
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static void isp_stat_buf_sync_magic_for_cpu(struct ispstat *stat,
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struct ispstat_buffer *buf,
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u32 buf_size,
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enum dma_data_direction dir)
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{
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if (ISP_STAT_USES_DMAENGINE(stat))
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return;
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__isp_stat_buf_sync_magic(stat, buf, buf_size, dir,
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dma_sync_single_range_for_cpu);
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}
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static int isp_stat_buf_check_magic(struct ispstat *stat,
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struct ispstat_buffer *buf)
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{
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const u32 buf_size = IS_H3A_AF(stat) ?
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buf->buf_size + AF_EXTRA_DATA : buf->buf_size;
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u8 *w;
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u8 *end;
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int ret = -EINVAL;
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isp_stat_buf_sync_magic_for_cpu(stat, buf, buf_size, DMA_FROM_DEVICE);
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/* Checking initial magic numbers. They shouldn't be here anymore. */
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for (w = buf->virt_addr, end = w + MAGIC_SIZE; w < end; w++)
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if (likely(*w != MAGIC_NUM))
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ret = 0;
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if (ret) {
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dev_dbg(stat->isp->dev,
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"%s: beginning magic check does not match.\n",
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stat->subdev.name);
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return ret;
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}
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/* Checking magic numbers at the end. They must be still here. */
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for (w = buf->virt_addr + buf_size, end = w + MAGIC_SIZE;
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w < end; w++) {
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if (unlikely(*w != MAGIC_NUM)) {
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dev_dbg(stat->isp->dev,
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"%s: ending magic check does not match.\n",
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stat->subdev.name);
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return -EINVAL;
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}
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}
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isp_stat_buf_sync_magic_for_device(stat, buf, buf_size,
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DMA_FROM_DEVICE);
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return 0;
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}
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static void isp_stat_buf_insert_magic(struct ispstat *stat,
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struct ispstat_buffer *buf)
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{
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const u32 buf_size = IS_H3A_AF(stat) ?
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stat->buf_size + AF_EXTRA_DATA : stat->buf_size;
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isp_stat_buf_sync_magic_for_cpu(stat, buf, buf_size, DMA_FROM_DEVICE);
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/*
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* Inserting MAGIC_NUM at the beginning and end of the buffer.
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* buf->buf_size is set only after the buffer is queued. For now the
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* right buf_size for the current configuration is pointed by
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* stat->buf_size.
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*/
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memset(buf->virt_addr, MAGIC_NUM, MAGIC_SIZE);
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memset(buf->virt_addr + buf_size, MAGIC_NUM, MAGIC_SIZE);
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isp_stat_buf_sync_magic_for_device(stat, buf, buf_size,
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DMA_BIDIRECTIONAL);
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}
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static void isp_stat_buf_sync_for_device(struct ispstat *stat,
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struct ispstat_buffer *buf)
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{
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if (ISP_STAT_USES_DMAENGINE(stat))
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return;
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dma_sync_sg_for_device(stat->isp->dev, buf->sgt.sgl,
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buf->sgt.nents, DMA_FROM_DEVICE);
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}
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static void isp_stat_buf_sync_for_cpu(struct ispstat *stat,
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struct ispstat_buffer *buf)
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{
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if (ISP_STAT_USES_DMAENGINE(stat))
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return;
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dma_sync_sg_for_cpu(stat->isp->dev, buf->sgt.sgl,
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buf->sgt.nents, DMA_FROM_DEVICE);
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}
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static void isp_stat_buf_clear(struct ispstat *stat)
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{
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int i;
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for (i = 0; i < STAT_MAX_BUFS; i++)
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stat->buf[i].empty = 1;
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}
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static struct ispstat_buffer *
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__isp_stat_buf_find(struct ispstat *stat, int look_empty)
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{
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struct ispstat_buffer *found = NULL;
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int i;
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for (i = 0; i < STAT_MAX_BUFS; i++) {
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struct ispstat_buffer *curr = &stat->buf[i];
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/*
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* Don't select the buffer which is being copied to
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* userspace or used by the module.
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*/
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if (curr == stat->locked_buf || curr == stat->active_buf)
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continue;
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/* Don't select uninitialised buffers if it's not required */
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if (!look_empty && curr->empty)
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continue;
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/* Pick uninitialised buffer over anything else if look_empty */
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if (curr->empty) {
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found = curr;
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break;
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}
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/* Choose the oldest buffer */
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if (!found ||
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(s32)curr->frame_number - (s32)found->frame_number < 0)
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found = curr;
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}
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return found;
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}
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static inline struct ispstat_buffer *
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isp_stat_buf_find_oldest(struct ispstat *stat)
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{
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return __isp_stat_buf_find(stat, 0);
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}
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static inline struct ispstat_buffer *
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isp_stat_buf_find_oldest_or_empty(struct ispstat *stat)
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{
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return __isp_stat_buf_find(stat, 1);
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}
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static int isp_stat_buf_queue(struct ispstat *stat)
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{
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if (!stat->active_buf)
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return STAT_NO_BUF;
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ktime_get_ts64(&stat->active_buf->ts);
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stat->active_buf->buf_size = stat->buf_size;
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if (isp_stat_buf_check_magic(stat, stat->active_buf)) {
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dev_dbg(stat->isp->dev, "%s: data wasn't properly written.\n",
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stat->subdev.name);
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return STAT_NO_BUF;
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}
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stat->active_buf->config_counter = stat->config_counter;
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stat->active_buf->frame_number = stat->frame_number;
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stat->active_buf->empty = 0;
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stat->active_buf = NULL;
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return STAT_BUF_DONE;
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}
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/* Get next free buffer to write the statistics to and mark it active. */
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static void isp_stat_buf_next(struct ispstat *stat)
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{
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if (unlikely(stat->active_buf))
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/* Overwriting unused active buffer */
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dev_dbg(stat->isp->dev,
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"%s: new buffer requested without queuing active one.\n",
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stat->subdev.name);
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else
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stat->active_buf = isp_stat_buf_find_oldest_or_empty(stat);
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}
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static void isp_stat_buf_release(struct ispstat *stat)
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{
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unsigned long flags;
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isp_stat_buf_sync_for_device(stat, stat->locked_buf);
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spin_lock_irqsave(&stat->isp->stat_lock, flags);
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stat->locked_buf = NULL;
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
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}
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/* Get buffer to userspace. */
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static struct ispstat_buffer *isp_stat_buf_get(struct ispstat *stat,
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struct omap3isp_stat_data *data)
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{
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int rval = 0;
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unsigned long flags;
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struct ispstat_buffer *buf;
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spin_lock_irqsave(&stat->isp->stat_lock, flags);
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while (1) {
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buf = isp_stat_buf_find_oldest(stat);
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if (!buf) {
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
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dev_dbg(stat->isp->dev, "%s: cannot find a buffer.\n",
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stat->subdev.name);
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return ERR_PTR(-EBUSY);
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}
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if (isp_stat_buf_check_magic(stat, buf)) {
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dev_dbg(stat->isp->dev,
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"%s: current buffer has corrupted data\n.",
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stat->subdev.name);
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/* Mark empty because it doesn't have valid data. */
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buf->empty = 1;
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} else {
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/* Buffer isn't corrupted. */
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break;
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}
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}
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stat->locked_buf = buf;
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
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if (buf->buf_size > data->buf_size) {
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dev_warn(stat->isp->dev,
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"%s: userspace's buffer size is not enough.\n",
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stat->subdev.name);
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isp_stat_buf_release(stat);
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return ERR_PTR(-EINVAL);
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}
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isp_stat_buf_sync_for_cpu(stat, buf);
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rval = copy_to_user(data->buf,
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buf->virt_addr,
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buf->buf_size);
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if (rval) {
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dev_info(stat->isp->dev,
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"%s: failed copying %d bytes of stat data\n",
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stat->subdev.name, rval);
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buf = ERR_PTR(-EFAULT);
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isp_stat_buf_release(stat);
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}
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return buf;
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}
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static void isp_stat_bufs_free(struct ispstat *stat)
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{
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struct device *dev = ISP_STAT_USES_DMAENGINE(stat)
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? NULL : stat->isp->dev;
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unsigned int i;
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for (i = 0; i < STAT_MAX_BUFS; i++) {
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struct ispstat_buffer *buf = &stat->buf[i];
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if (!buf->virt_addr)
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continue;
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sg_free_table(&buf->sgt);
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dma_free_coherent(dev, stat->buf_alloc_size, buf->virt_addr,
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buf->dma_addr);
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buf->dma_addr = 0;
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buf->virt_addr = NULL;
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buf->empty = 1;
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}
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dev_dbg(stat->isp->dev, "%s: all buffers were freed.\n",
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stat->subdev.name);
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stat->buf_alloc_size = 0;
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stat->active_buf = NULL;
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}
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static int isp_stat_bufs_alloc_one(struct device *dev,
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struct ispstat_buffer *buf,
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unsigned int size)
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{
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int ret;
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buf->virt_addr = dma_alloc_coherent(dev, size, &buf->dma_addr,
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GFP_KERNEL);
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if (!buf->virt_addr)
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return -ENOMEM;
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ret = dma_get_sgtable(dev, &buf->sgt, buf->virt_addr, buf->dma_addr,
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size);
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if (ret < 0) {
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dma_free_coherent(dev, size, buf->virt_addr, buf->dma_addr);
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buf->virt_addr = NULL;
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buf->dma_addr = 0;
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return ret;
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}
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return 0;
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}
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/*
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* The device passed to the DMA API depends on whether the statistics block uses
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* ISP DMA, external DMA or PIO to transfer data.
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*
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* The first case (for the AEWB and AF engines) passes the ISP device, resulting
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* in the DMA buffers being mapped through the ISP IOMMU.
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*
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* The second case (for the histogram engine) should pass the DMA engine device.
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* As that device isn't accessible through the OMAP DMA engine API the driver
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* passes NULL instead, resulting in the buffers being mapped directly as
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* physical pages.
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*
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* The third case (for the histogram engine) doesn't require any mapping. The
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* buffers could be allocated with kmalloc/vmalloc, but we still use
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* dma_alloc_coherent() for consistency purpose.
|
*/
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static int isp_stat_bufs_alloc(struct ispstat *stat, u32 size)
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{
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struct device *dev = ISP_STAT_USES_DMAENGINE(stat)
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? NULL : stat->isp->dev;
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unsigned long flags;
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unsigned int i;
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spin_lock_irqsave(&stat->isp->stat_lock, flags);
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BUG_ON(stat->locked_buf != NULL);
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/* Are the old buffers big enough? */
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if (stat->buf_alloc_size >= size) {
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
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return 0;
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}
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if (stat->state != ISPSTAT_DISABLED || stat->buf_processing) {
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dev_info(stat->isp->dev,
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"%s: trying to allocate memory when busy\n",
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stat->subdev.name);
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
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return -EBUSY;
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}
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
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isp_stat_bufs_free(stat);
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stat->buf_alloc_size = size;
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for (i = 0; i < STAT_MAX_BUFS; i++) {
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struct ispstat_buffer *buf = &stat->buf[i];
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int ret;
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ret = isp_stat_bufs_alloc_one(dev, buf, size);
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if (ret < 0) {
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dev_err(stat->isp->dev,
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"%s: Failed to allocate DMA buffer %u\n",
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stat->subdev.name, i);
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isp_stat_bufs_free(stat);
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return ret;
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}
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buf->empty = 1;
|
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dev_dbg(stat->isp->dev,
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"%s: buffer[%u] allocated. dma=%pad virt=%p",
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stat->subdev.name, i, &buf->dma_addr, buf->virt_addr);
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}
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return 0;
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}
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static void isp_stat_queue_event(struct ispstat *stat, int err)
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{
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struct video_device *vdev = stat->subdev.devnode;
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struct v4l2_event event;
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struct omap3isp_stat_event_status *status = (void *)event.u.data;
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memset(&event, 0, sizeof(event));
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if (!err) {
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status->frame_number = stat->frame_number;
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status->config_counter = stat->config_counter;
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} else {
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status->buf_err = 1;
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}
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event.type = stat->event_type;
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v4l2_event_queue(vdev, &event);
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}
|
|
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/*
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* omap3isp_stat_request_statistics - Request statistics.
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* @data: Pointer to return statistics data.
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*
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* Returns 0 if successful.
|
*/
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int omap3isp_stat_request_statistics(struct ispstat *stat,
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struct omap3isp_stat_data *data)
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{
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struct ispstat_buffer *buf;
|
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if (stat->state != ISPSTAT_ENABLED) {
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dev_dbg(stat->isp->dev, "%s: engine not enabled.\n",
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stat->subdev.name);
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return -EINVAL;
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}
|
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mutex_lock(&stat->ioctl_lock);
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buf = isp_stat_buf_get(stat, data);
|
if (IS_ERR(buf)) {
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mutex_unlock(&stat->ioctl_lock);
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return PTR_ERR(buf);
|
}
|
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data->ts.tv_sec = buf->ts.tv_sec;
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data->ts.tv_usec = buf->ts.tv_nsec / NSEC_PER_USEC;
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data->config_counter = buf->config_counter;
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data->frame_number = buf->frame_number;
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data->buf_size = buf->buf_size;
|
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buf->empty = 1;
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isp_stat_buf_release(stat);
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mutex_unlock(&stat->ioctl_lock);
|
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return 0;
|
}
|
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int omap3isp_stat_request_statistics_time32(struct ispstat *stat,
|
struct omap3isp_stat_data_time32 *data)
|
{
|
struct omap3isp_stat_data data64;
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int ret;
|
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ret = omap3isp_stat_request_statistics(stat, &data64);
|
if (ret)
|
return ret;
|
|
data->ts.tv_sec = data64.ts.tv_sec;
|
data->ts.tv_usec = data64.ts.tv_usec;
|
memcpy(&data->buf, &data64.buf, sizeof(*data) - sizeof(data->ts));
|
|
return 0;
|
}
|
|
/*
|
* omap3isp_stat_config - Receives new statistic engine configuration.
|
* @new_conf: Pointer to config structure.
|
*
|
* Returns 0 if successful, -EINVAL if new_conf pointer is NULL, -ENOMEM if
|
* was unable to allocate memory for the buffer, or other errors if parameters
|
* are invalid.
|
*/
|
int omap3isp_stat_config(struct ispstat *stat, void *new_conf)
|
{
|
int ret;
|
unsigned long irqflags;
|
struct ispstat_generic_config *user_cfg = new_conf;
|
u32 buf_size = user_cfg->buf_size;
|
|
mutex_lock(&stat->ioctl_lock);
|
|
dev_dbg(stat->isp->dev,
|
"%s: configuring module with buffer size=0x%08lx\n",
|
stat->subdev.name, (unsigned long)buf_size);
|
|
ret = stat->ops->validate_params(stat, new_conf);
|
if (ret) {
|
mutex_unlock(&stat->ioctl_lock);
|
dev_dbg(stat->isp->dev, "%s: configuration values are invalid.\n",
|
stat->subdev.name);
|
return ret;
|
}
|
|
if (buf_size != user_cfg->buf_size)
|
dev_dbg(stat->isp->dev,
|
"%s: driver has corrected buffer size request to 0x%08lx\n",
|
stat->subdev.name,
|
(unsigned long)user_cfg->buf_size);
|
|
/*
|
* Hack: H3A modules may need a doubled buffer size to avoid access
|
* to a invalid memory address after a SBL overflow.
|
* The buffer size is always PAGE_ALIGNED.
|
* Hack 2: MAGIC_SIZE is added to buf_size so a magic word can be
|
* inserted at the end to data integrity check purpose.
|
* Hack 3: AF module writes one paxel data more than it should, so
|
* the buffer allocation must consider it to avoid invalid memory
|
* access.
|
* Hack 4: H3A need to allocate extra space for the recover state.
|
*/
|
if (IS_H3A(stat)) {
|
buf_size = user_cfg->buf_size * 2 + MAGIC_SIZE;
|
if (IS_H3A_AF(stat))
|
/*
|
* Adding one extra paxel data size for each recover
|
* buffer + 2 regular ones.
|
*/
|
buf_size += AF_EXTRA_DATA * (NUM_H3A_RECOVER_BUFS + 2);
|
if (stat->recover_priv) {
|
struct ispstat_generic_config *recover_cfg =
|
stat->recover_priv;
|
buf_size += recover_cfg->buf_size *
|
NUM_H3A_RECOVER_BUFS;
|
}
|
buf_size = PAGE_ALIGN(buf_size);
|
} else { /* Histogram */
|
buf_size = PAGE_ALIGN(user_cfg->buf_size + MAGIC_SIZE);
|
}
|
|
ret = isp_stat_bufs_alloc(stat, buf_size);
|
if (ret) {
|
mutex_unlock(&stat->ioctl_lock);
|
return ret;
|
}
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags);
|
stat->ops->set_params(stat, new_conf);
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
|
/*
|
* Returning the right future config_counter for this setup, so
|
* userspace can *know* when it has been applied.
|
*/
|
user_cfg->config_counter = stat->config_counter + stat->inc_config;
|
|
/* Module has a valid configuration. */
|
stat->configured = 1;
|
dev_dbg(stat->isp->dev,
|
"%s: module has been successfully configured.\n",
|
stat->subdev.name);
|
|
mutex_unlock(&stat->ioctl_lock);
|
|
return 0;
|
}
|
|
/*
|
* isp_stat_buf_process - Process statistic buffers.
|
* @buf_state: points out if buffer is ready to be processed. It's necessary
|
* because histogram needs to copy the data from internal memory
|
* before be able to process the buffer.
|
*/
|
static int isp_stat_buf_process(struct ispstat *stat, int buf_state)
|
{
|
int ret = STAT_NO_BUF;
|
|
if (!atomic_add_unless(&stat->buf_err, -1, 0) &&
|
buf_state == STAT_BUF_DONE && stat->state == ISPSTAT_ENABLED) {
|
ret = isp_stat_buf_queue(stat);
|
isp_stat_buf_next(stat);
|
}
|
|
return ret;
|
}
|
|
int omap3isp_stat_pcr_busy(struct ispstat *stat)
|
{
|
return stat->ops->busy(stat);
|
}
|
|
int omap3isp_stat_busy(struct ispstat *stat)
|
{
|
return omap3isp_stat_pcr_busy(stat) | stat->buf_processing |
|
(stat->state != ISPSTAT_DISABLED);
|
}
|
|
/*
|
* isp_stat_pcr_enable - Disables/Enables statistic engines.
|
* @pcr_enable: 0/1 - Disables/Enables the engine.
|
*
|
* Must be called from ISP driver when the module is idle and synchronized
|
* with CCDC.
|
*/
|
static void isp_stat_pcr_enable(struct ispstat *stat, u8 pcr_enable)
|
{
|
if ((stat->state != ISPSTAT_ENABLING &&
|
stat->state != ISPSTAT_ENABLED) && pcr_enable)
|
/* Userspace has disabled the module. Aborting. */
|
return;
|
|
stat->ops->enable(stat, pcr_enable);
|
if (stat->state == ISPSTAT_DISABLING && !pcr_enable)
|
stat->state = ISPSTAT_DISABLED;
|
else if (stat->state == ISPSTAT_ENABLING && pcr_enable)
|
stat->state = ISPSTAT_ENABLED;
|
}
|
|
void omap3isp_stat_suspend(struct ispstat *stat)
|
{
|
unsigned long flags;
|
|
spin_lock_irqsave(&stat->isp->stat_lock, flags);
|
|
if (stat->state != ISPSTAT_DISABLED)
|
stat->ops->enable(stat, 0);
|
if (stat->state == ISPSTAT_ENABLED)
|
stat->state = ISPSTAT_SUSPENDED;
|
|
spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
|
}
|
|
void omap3isp_stat_resume(struct ispstat *stat)
|
{
|
/* Module will be re-enabled with its pipeline */
|
if (stat->state == ISPSTAT_SUSPENDED)
|
stat->state = ISPSTAT_ENABLING;
|
}
|
|
static void isp_stat_try_enable(struct ispstat *stat)
|
{
|
unsigned long irqflags;
|
|
if (stat->priv == NULL)
|
/* driver wasn't initialised */
|
return;
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags);
|
if (stat->state == ISPSTAT_ENABLING && !stat->buf_processing &&
|
stat->buf_alloc_size) {
|
/*
|
* Userspace's requested to enable the engine but it wasn't yet.
|
* Let's do that now.
|
*/
|
stat->update = 1;
|
isp_stat_buf_next(stat);
|
stat->ops->setup_regs(stat, stat->priv);
|
isp_stat_buf_insert_magic(stat, stat->active_buf);
|
|
/*
|
* H3A module has some hw issues which forces the driver to
|
* ignore next buffers even if it was disabled in the meantime.
|
* On the other hand, Histogram shouldn't ignore buffers anymore
|
* if it's being enabled.
|
*/
|
if (!IS_H3A(stat))
|
atomic_set(&stat->buf_err, 0);
|
|
isp_stat_pcr_enable(stat, 1);
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
dev_dbg(stat->isp->dev, "%s: module is enabled.\n",
|
stat->subdev.name);
|
} else {
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
}
|
}
|
|
void omap3isp_stat_isr_frame_sync(struct ispstat *stat)
|
{
|
isp_stat_try_enable(stat);
|
}
|
|
void omap3isp_stat_sbl_overflow(struct ispstat *stat)
|
{
|
unsigned long irqflags;
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags);
|
/*
|
* Due to a H3A hw issue which prevents the next buffer to start from
|
* the correct memory address, 2 buffers must be ignored.
|
*/
|
atomic_set(&stat->buf_err, 2);
|
|
/*
|
* If more than one SBL overflow happen in a row, H3A module may access
|
* invalid memory region.
|
* stat->sbl_ovl_recover is set to tell to the driver to temporarily use
|
* a soft configuration which helps to avoid consecutive overflows.
|
*/
|
if (stat->recover_priv)
|
stat->sbl_ovl_recover = 1;
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
}
|
|
/*
|
* omap3isp_stat_enable - Disable/Enable statistic engine as soon as possible
|
* @enable: 0/1 - Disables/Enables the engine.
|
*
|
* Client should configure all the module registers before this.
|
* This function can be called from a userspace request.
|
*/
|
int omap3isp_stat_enable(struct ispstat *stat, u8 enable)
|
{
|
unsigned long irqflags;
|
|
dev_dbg(stat->isp->dev, "%s: user wants to %s module.\n",
|
stat->subdev.name, enable ? "enable" : "disable");
|
|
/* Prevent enabling while configuring */
|
mutex_lock(&stat->ioctl_lock);
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags);
|
|
if (!stat->configured && enable) {
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
mutex_unlock(&stat->ioctl_lock);
|
dev_dbg(stat->isp->dev,
|
"%s: cannot enable module as it's never been successfully configured so far.\n",
|
stat->subdev.name);
|
return -EINVAL;
|
}
|
|
if (enable) {
|
if (stat->state == ISPSTAT_DISABLING)
|
/* Previous disabling request wasn't done yet */
|
stat->state = ISPSTAT_ENABLED;
|
else if (stat->state == ISPSTAT_DISABLED)
|
/* Module is now being enabled */
|
stat->state = ISPSTAT_ENABLING;
|
} else {
|
if (stat->state == ISPSTAT_ENABLING) {
|
/* Previous enabling request wasn't done yet */
|
stat->state = ISPSTAT_DISABLED;
|
} else if (stat->state == ISPSTAT_ENABLED) {
|
/* Module is now being disabled */
|
stat->state = ISPSTAT_DISABLING;
|
isp_stat_buf_clear(stat);
|
}
|
}
|
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
mutex_unlock(&stat->ioctl_lock);
|
|
return 0;
|
}
|
|
int omap3isp_stat_s_stream(struct v4l2_subdev *subdev, int enable)
|
{
|
struct ispstat *stat = v4l2_get_subdevdata(subdev);
|
|
if (enable) {
|
/*
|
* Only set enable PCR bit if the module was previously
|
* enabled through ioctl.
|
*/
|
isp_stat_try_enable(stat);
|
} else {
|
unsigned long flags;
|
/* Disable PCR bit and config enable field */
|
omap3isp_stat_enable(stat, 0);
|
spin_lock_irqsave(&stat->isp->stat_lock, flags);
|
stat->ops->enable(stat, 0);
|
spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
|
|
/*
|
* If module isn't busy, a new interrupt may come or not to
|
* set the state to DISABLED. As Histogram needs to read its
|
* internal memory to clear it, let interrupt handler
|
* responsible of changing state to DISABLED. If the last
|
* interrupt is coming, it's still safe as the handler will
|
* ignore the second time when state is already set to DISABLED.
|
* It's necessary to synchronize Histogram with streamoff, once
|
* the module may be considered idle before last SDMA transfer
|
* starts if we return here.
|
*/
|
if (!omap3isp_stat_pcr_busy(stat))
|
omap3isp_stat_isr(stat);
|
|
dev_dbg(stat->isp->dev, "%s: module is being disabled\n",
|
stat->subdev.name);
|
}
|
|
return 0;
|
}
|
|
/*
|
* __stat_isr - Interrupt handler for statistic drivers
|
*/
|
static void __stat_isr(struct ispstat *stat, int from_dma)
|
{
|
int ret = STAT_BUF_DONE;
|
int buf_processing;
|
unsigned long irqflags;
|
struct isp_pipeline *pipe;
|
|
/*
|
* stat->buf_processing must be set before disable module. It's
|
* necessary to not inform too early the buffers aren't busy in case
|
* of SDMA is going to be used.
|
*/
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags);
|
if (stat->state == ISPSTAT_DISABLED) {
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
return;
|
}
|
buf_processing = stat->buf_processing;
|
stat->buf_processing = 1;
|
stat->ops->enable(stat, 0);
|
|
if (buf_processing && !from_dma) {
|
if (stat->state == ISPSTAT_ENABLED) {
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
dev_err(stat->isp->dev,
|
"%s: interrupt occurred when module was still processing a buffer.\n",
|
stat->subdev.name);
|
ret = STAT_NO_BUF;
|
goto out;
|
} else {
|
/*
|
* Interrupt handler was called from streamoff when
|
* the module wasn't busy anymore to ensure it is being
|
* disabled after process last buffer. If such buffer
|
* processing has already started, no need to do
|
* anything else.
|
*/
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
return;
|
}
|
}
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
|
/* If it's busy we can't process this buffer anymore */
|
if (!omap3isp_stat_pcr_busy(stat)) {
|
if (!from_dma && stat->ops->buf_process)
|
/* Module still need to copy data to buffer. */
|
ret = stat->ops->buf_process(stat);
|
if (ret == STAT_BUF_WAITING_DMA)
|
/* Buffer is not ready yet */
|
return;
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags);
|
|
/*
|
* Histogram needs to read its internal memory to clear it
|
* before be disabled. For that reason, common statistic layer
|
* can return only after call stat's buf_process() operator.
|
*/
|
if (stat->state == ISPSTAT_DISABLING) {
|
stat->state = ISPSTAT_DISABLED;
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
stat->buf_processing = 0;
|
return;
|
}
|
pipe = to_isp_pipeline(&stat->subdev.entity);
|
stat->frame_number = atomic_read(&pipe->frame_number);
|
|
/*
|
* Before this point, 'ret' stores the buffer's status if it's
|
* ready to be processed. Afterwards, it holds the status if
|
* it was processed successfully.
|
*/
|
ret = isp_stat_buf_process(stat, ret);
|
|
if (likely(!stat->sbl_ovl_recover)) {
|
stat->ops->setup_regs(stat, stat->priv);
|
} else {
|
/*
|
* Using recover config to increase the chance to have
|
* a good buffer processing and make the H3A module to
|
* go back to a valid state.
|
*/
|
stat->update = 1;
|
stat->ops->setup_regs(stat, stat->recover_priv);
|
stat->sbl_ovl_recover = 0;
|
|
/*
|
* Set 'update' in case of the module needs to use
|
* regular configuration after next buffer.
|
*/
|
stat->update = 1;
|
}
|
|
isp_stat_buf_insert_magic(stat, stat->active_buf);
|
|
/*
|
* Hack: H3A modules may access invalid memory address or send
|
* corrupted data to userspace if more than 1 SBL overflow
|
* happens in a row without re-writing its buffer's start memory
|
* address in the meantime. Such situation is avoided if the
|
* module is not immediately re-enabled when the ISR misses the
|
* timing to process the buffer and to setup the registers.
|
* Because of that, pcr_enable(1) was moved to inside this 'if'
|
* block. But the next interruption will still happen as during
|
* pcr_enable(0) the module was busy.
|
*/
|
isp_stat_pcr_enable(stat, 1);
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags);
|
} else {
|
/*
|
* If a SBL overflow occurs and the H3A driver misses the timing
|
* to process the buffer, stat->buf_err is set and won't be
|
* cleared now. So the next buffer will be correctly ignored.
|
* It's necessary due to a hw issue which makes the next H3A
|
* buffer to start from the memory address where the previous
|
* one stopped, instead of start where it was configured to.
|
* Do not "stat->buf_err = 0" here.
|
*/
|
|
if (stat->ops->buf_process)
|
/*
|
* Driver may need to erase current data prior to
|
* process a new buffer. If it misses the timing, the
|
* next buffer might be wrong. So should be ignored.
|
* It happens only for Histogram.
|
*/
|
atomic_set(&stat->buf_err, 1);
|
|
ret = STAT_NO_BUF;
|
dev_dbg(stat->isp->dev,
|
"%s: cannot process buffer, device is busy.\n",
|
stat->subdev.name);
|
}
|
|
out:
|
stat->buf_processing = 0;
|
isp_stat_queue_event(stat, ret != STAT_BUF_DONE);
|
}
|
|
void omap3isp_stat_isr(struct ispstat *stat)
|
{
|
__stat_isr(stat, 0);
|
}
|
|
void omap3isp_stat_dma_isr(struct ispstat *stat)
|
{
|
__stat_isr(stat, 1);
|
}
|
|
int omap3isp_stat_subscribe_event(struct v4l2_subdev *subdev,
|
struct v4l2_fh *fh,
|
struct v4l2_event_subscription *sub)
|
{
|
struct ispstat *stat = v4l2_get_subdevdata(subdev);
|
|
if (sub->type != stat->event_type)
|
return -EINVAL;
|
|
return v4l2_event_subscribe(fh, sub, STAT_NEVENTS, NULL);
|
}
|
|
int omap3isp_stat_unsubscribe_event(struct v4l2_subdev *subdev,
|
struct v4l2_fh *fh,
|
struct v4l2_event_subscription *sub)
|
{
|
return v4l2_event_unsubscribe(fh, sub);
|
}
|
|
void omap3isp_stat_unregister_entities(struct ispstat *stat)
|
{
|
v4l2_device_unregister_subdev(&stat->subdev);
|
}
|
|
int omap3isp_stat_register_entities(struct ispstat *stat,
|
struct v4l2_device *vdev)
|
{
|
stat->subdev.dev = vdev->mdev->dev;
|
|
return v4l2_device_register_subdev(vdev, &stat->subdev);
|
}
|
|
static int isp_stat_init_entities(struct ispstat *stat, const char *name,
|
const struct v4l2_subdev_ops *sd_ops)
|
{
|
struct v4l2_subdev *subdev = &stat->subdev;
|
struct media_entity *me = &subdev->entity;
|
|
v4l2_subdev_init(subdev, sd_ops);
|
snprintf(subdev->name, V4L2_SUBDEV_NAME_SIZE, "OMAP3 ISP %s", name);
|
subdev->grp_id = BIT(16); /* group ID for isp subdevs */
|
subdev->flags |= V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_HAS_DEVNODE;
|
v4l2_set_subdevdata(subdev, stat);
|
|
stat->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
|
me->ops = NULL;
|
|
return media_entity_pads_init(me, 1, &stat->pad);
|
}
|
|
int omap3isp_stat_init(struct ispstat *stat, const char *name,
|
const struct v4l2_subdev_ops *sd_ops)
|
{
|
int ret;
|
|
stat->buf = kcalloc(STAT_MAX_BUFS, sizeof(*stat->buf), GFP_KERNEL);
|
if (!stat->buf)
|
return -ENOMEM;
|
|
isp_stat_buf_clear(stat);
|
mutex_init(&stat->ioctl_lock);
|
atomic_set(&stat->buf_err, 0);
|
|
ret = isp_stat_init_entities(stat, name, sd_ops);
|
if (ret < 0) {
|
mutex_destroy(&stat->ioctl_lock);
|
kfree(stat->buf);
|
}
|
|
return ret;
|
}
|
|
void omap3isp_stat_cleanup(struct ispstat *stat)
|
{
|
media_entity_cleanup(&stat->subdev.entity);
|
mutex_destroy(&stat->ioctl_lock);
|
isp_stat_bufs_free(stat);
|
kfree(stat->buf);
|
kfree(stat->priv);
|
kfree(stat->recover_priv);
|
}
|
