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authorMauro Carvalho Chehab <mchehab@redhat.com>2012-08-14 17:31:16 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-08-15 16:43:09 -0300
commit2c3fb08b3f74b8792004095a1f6881a3296ff643 (patch)
tree19be9d09c4aa66d4363ee9d38a43721f5d6b144f /drivers/media/platform/omap3isp/ispstat.c
parent2a2d1cf46500ab7599d0b45ee837f3936763ccac (diff)
[media] rename drivers/media/video as .../platform
The remaining drivers are mostly platform drivers. Name the dir to reflect it. It makes sense to latter break it into a few other dirs. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/platform/omap3isp/ispstat.c')
-rw-r--r--drivers/media/platform/omap3isp/ispstat.c1102
1 files changed, 1102 insertions, 0 deletions
diff --git a/drivers/media/platform/omap3isp/ispstat.c b/drivers/media/platform/omap3isp/ispstat.c
new file mode 100644
index 000000000000..b8640be692f1
--- /dev/null
+++ b/drivers/media/platform/omap3isp/ispstat.c
@@ -0,0 +1,1102 @@
+/*
+ * ispstat.c
+ *
+ * TI OMAP3 ISP - Statistics core
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ * Copyright (C) 2009 Texas Instruments, Inc
+ *
+ * Contacts: David Cohen <dacohen@gmail.com>
+ * Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ * Sakari Ailus <sakari.ailus@iki.fi>
+ *
+ * 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.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include "isp.h"
+
+#define IS_COHERENT_BUF(stat) ((stat)->dma_ch >= 0)
+
+/*
+ * MAGIC_SIZE must always be the greatest common divisor of
+ * AEWB_PACKET_SIZE and AF_PAXEL_SIZE.
+ */
+#define MAGIC_SIZE 16
+#define MAGIC_NUM 0x55
+
+/* HACK: AF module seems to be writing one more paxel data than it should. */
+#define AF_EXTRA_DATA OMAP3ISP_AF_PAXEL_SIZE
+
+/*
+ * HACK: H3A modules go to an invalid state after have a SBL overflow. It makes
+ * the next buffer to start to be written in the same point where the overflow
+ * occurred instead of the configured address. The only known way to make it to
+ * go back to a valid state is having a valid buffer processing. Of course it
+ * requires at least a doubled buffer size to avoid an access to invalid memory
+ * region. But it does not fix everything. It may happen more than one
+ * consecutive SBL overflows. In that case, it might be unpredictable how many
+ * buffers the allocated memory should fit. For that case, a recover
+ * configuration was created. It produces the minimum buffer size for each H3A
+ * module and decrease the change for more SBL overflows. This recover state
+ * will be enabled every time a SBL overflow occur. As the output buffer size
+ * isn't big, it's possible to have an extra size able to fit many recover
+ * buffers making it extreamily unlikely to have an access to invalid memory
+ * region.
+ */
+#define NUM_H3A_RECOVER_BUFS 10
+
+/*
+ * HACK: Because of HW issues the generic layer sometimes need to have
+ * different behaviour for different statistic modules.
+ */
+#define IS_H3A_AF(stat) ((stat) == &(stat)->isp->isp_af)
+#define IS_H3A_AEWB(stat) ((stat) == &(stat)->isp->isp_aewb)
+#define IS_H3A(stat) (IS_H3A_AF(stat) || IS_H3A_AEWB(stat))
+
+static void __isp_stat_buf_sync_magic(struct ispstat *stat,
+ struct ispstat_buffer *buf,
+ u32 buf_size, enum dma_data_direction dir,
+ void (*dma_sync)(struct device *,
+ dma_addr_t, unsigned long, size_t,
+ enum dma_data_direction))
+{
+ struct device *dev = stat->isp->dev;
+ struct page *pg;
+ dma_addr_t dma_addr;
+ u32 offset;
+
+ /* Initial magic words */
+ pg = vmalloc_to_page(buf->virt_addr);
+ dma_addr = pfn_to_dma(dev, page_to_pfn(pg));
+ dma_sync(dev, dma_addr, 0, MAGIC_SIZE, dir);
+
+ /* Final magic words */
+ pg = vmalloc_to_page(buf->virt_addr + buf_size);
+ dma_addr = pfn_to_dma(dev, page_to_pfn(pg));
+ offset = ((u32)buf->virt_addr + buf_size) & ~PAGE_MASK;
+ dma_sync(dev, dma_addr, offset, MAGIC_SIZE, dir);
+}
+
+static void isp_stat_buf_sync_magic_for_device(struct ispstat *stat,
+ struct ispstat_buffer *buf,
+ u32 buf_size,
+ enum dma_data_direction dir)
+{
+ if (IS_COHERENT_BUF(stat))
+ return;
+
+ __isp_stat_buf_sync_magic(stat, buf, buf_size, dir,
+ dma_sync_single_range_for_device);
+}
+
+static void isp_stat_buf_sync_magic_for_cpu(struct ispstat *stat,
+ struct ispstat_buffer *buf,
+ u32 buf_size,
+ enum dma_data_direction dir)
+{
+ if (IS_COHERENT_BUF(stat))
+ return;
+
+ __isp_stat_buf_sync_magic(stat, buf, buf_size, dir,
+ dma_sync_single_range_for_cpu);
+}
+
+static int isp_stat_buf_check_magic(struct ispstat *stat,
+ struct ispstat_buffer *buf)
+{
+ const u32 buf_size = IS_H3A_AF(stat) ?
+ buf->buf_size + AF_EXTRA_DATA : buf->buf_size;
+ u8 *w;
+ u8 *end;
+ int ret = -EINVAL;
+
+ isp_stat_buf_sync_magic_for_cpu(stat, buf, buf_size, DMA_FROM_DEVICE);
+
+ /* Checking initial magic numbers. They shouldn't be here anymore. */
+ for (w = buf->virt_addr, end = w + MAGIC_SIZE; w < end; w++)
+ if (likely(*w != MAGIC_NUM))
+ ret = 0;
+
+ if (ret) {
+ dev_dbg(stat->isp->dev, "%s: beginning magic check does not "
+ "match.\n", stat->subdev.name);
+ return ret;
+ }
+
+ /* Checking magic numbers at the end. They must be still here. */
+ for (w = buf->virt_addr + buf_size, end = w + MAGIC_SIZE;
+ w < end; w++) {
+ if (unlikely(*w != MAGIC_NUM)) {
+ dev_dbg(stat->isp->dev, "%s: endding magic check does "
+ "not match.\n", stat->subdev.name);
+ return -EINVAL;
+ }
+ }
+
+ isp_stat_buf_sync_magic_for_device(stat, buf, buf_size,
+ DMA_FROM_DEVICE);
+
+ return 0;
+}
+
+static void isp_stat_buf_insert_magic(struct ispstat *stat,
+ struct ispstat_buffer *buf)
+{
+ const u32 buf_size = IS_H3A_AF(stat) ?
+ stat->buf_size + AF_EXTRA_DATA : stat->buf_size;
+
+ isp_stat_buf_sync_magic_for_cpu(stat, buf, buf_size, DMA_FROM_DEVICE);
+
+ /*
+ * Inserting MAGIC_NUM at the beginning and end of the buffer.
+ * buf->buf_size is set only after the buffer is queued. For now the
+ * right buf_size for the current configuration is pointed by
+ * stat->buf_size.
+ */
+ memset(buf->virt_addr, MAGIC_NUM, MAGIC_SIZE);
+ memset(buf->virt_addr + buf_size, MAGIC_NUM, MAGIC_SIZE);
+
+ isp_stat_buf_sync_magic_for_device(stat, buf, buf_size,
+ DMA_BIDIRECTIONAL);
+}
+
+static void isp_stat_buf_sync_for_device(struct ispstat *stat,
+ struct ispstat_buffer *buf)
+{
+ if (IS_COHERENT_BUF(stat))
+ return;
+
+ dma_sync_sg_for_device(stat->isp->dev, buf->iovm->sgt->sgl,
+ buf->iovm->sgt->nents, DMA_FROM_DEVICE);
+}
+
+static void isp_stat_buf_sync_for_cpu(struct ispstat *stat,
+ struct ispstat_buffer *buf)
+{
+ if (IS_COHERENT_BUF(stat))
+ return;
+
+ dma_sync_sg_for_cpu(stat->isp->dev, buf->iovm->sgt->sgl,
+ buf->iovm->sgt->nents, DMA_FROM_DEVICE);
+}
+
+static void isp_stat_buf_clear(struct ispstat *stat)
+{
+ int i;
+
+ for (i = 0; i < STAT_MAX_BUFS; i++)
+ stat->buf[i].empty = 1;
+}
+
+static struct ispstat_buffer *
+__isp_stat_buf_find(struct ispstat *stat, int look_empty)
+{
+ struct ispstat_buffer *found = NULL;
+ int i;
+
+ for (i = 0; i < STAT_MAX_BUFS; i++) {
+ struct ispstat_buffer *curr = &stat->buf[i];
+
+ /*
+ * Don't select the buffer which is being copied to
+ * userspace or used by the module.
+ */
+ if (curr == stat->locked_buf || curr == stat->active_buf)
+ continue;
+
+ /* Don't select uninitialised buffers if it's not required */
+ if (!look_empty && curr->empty)
+ continue;
+
+ /* Pick uninitialised buffer over anything else if look_empty */
+ if (curr->empty) {
+ found = curr;
+ break;
+ }
+
+ /* Choose the oldest buffer */
+ if (!found ||
+ (s32)curr->frame_number - (s32)found->frame_number < 0)
+ found = curr;
+ }
+
+ return found;
+}
+
+static inline struct ispstat_buffer *
+isp_stat_buf_find_oldest(struct ispstat *stat)
+{
+ return __isp_stat_buf_find(stat, 0);
+}
+
+static inline struct ispstat_buffer *
+isp_stat_buf_find_oldest_or_empty(struct ispstat *stat)
+{
+ return __isp_stat_buf_find(stat, 1);
+}
+
+static int isp_stat_buf_queue(struct ispstat *stat)
+{
+ if (!stat->active_buf)
+ return STAT_NO_BUF;
+
+ do_gettimeofday(&stat->active_buf->ts);
+
+ stat->active_buf->buf_size = stat->buf_size;
+ if (isp_stat_buf_check_magic(stat, stat->active_buf)) {
+ dev_dbg(stat->isp->dev, "%s: data wasn't properly written.\n",
+ stat->subdev.name);
+ return STAT_NO_BUF;
+ }
+ stat->active_buf->config_counter = stat->config_counter;
+ stat->active_buf->frame_number = stat->frame_number;
+ stat->active_buf->empty = 0;
+ stat->active_buf = NULL;
+
+ return STAT_BUF_DONE;
+}
+
+/* Get next free buffer to write the statistics to and mark it active. */
+static void isp_stat_buf_next(struct ispstat *stat)
+{
+ if (unlikely(stat->active_buf))
+ /* Overwriting unused active buffer */
+ dev_dbg(stat->isp->dev, "%s: new buffer requested without "
+ "queuing active one.\n",
+ stat->subdev.name);
+ else
+ stat->active_buf = isp_stat_buf_find_oldest_or_empty(stat);
+}
+
+static void isp_stat_buf_release(struct ispstat *stat)
+{
+ unsigned long flags;
+
+ isp_stat_buf_sync_for_device(stat, stat->locked_buf);
+ spin_lock_irqsave(&stat->isp->stat_lock, flags);
+ stat->locked_buf = NULL;
+ spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
+}
+
+/* Get buffer to userspace. */
+static struct ispstat_buffer *isp_stat_buf_get(struct ispstat *stat,
+ struct omap3isp_stat_data *data)
+{
+ int rval = 0;
+ unsigned long flags;
+ struct ispstat_buffer *buf;
+
+ spin_lock_irqsave(&stat->isp->stat_lock, flags);
+
+ while (1) {
+ buf = isp_stat_buf_find_oldest(stat);
+ if (!buf) {
+ spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
+ dev_dbg(stat->isp->dev, "%s: cannot find a buffer.\n",
+ stat->subdev.name);
+ return ERR_PTR(-EBUSY);
+ }
+ if (isp_stat_buf_check_magic(stat, buf)) {
+ dev_dbg(stat->isp->dev, "%s: current buffer has "
+ "corrupted data\n.", stat->subdev.name);
+ /* Mark empty because it doesn't have valid data. */
+ buf->empty = 1;
+ } else {
+ /* Buffer isn't corrupted. */
+ break;
+ }
+ }
+
+ stat->locked_buf = buf;
+
+ spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
+
+ if (buf->buf_size > data->buf_size) {
+ dev_warn(stat->isp->dev, "%s: userspace's buffer size is "
+ "not enough.\n", stat->subdev.name);
+ isp_stat_buf_release(stat);
+ return ERR_PTR(-EINVAL);
+ }
+
+ isp_stat_buf_sync_for_cpu(stat, buf);
+
+ rval = copy_to_user(data->buf,
+ buf->virt_addr,
+ buf->buf_size);
+
+ if (rval) {
+ dev_info(stat->isp->dev,
+ "%s: failed copying %d bytes of stat data\n",
+ stat->subdev.name, rval);
+ buf = ERR_PTR(-EFAULT);
+ isp_stat_buf_release(stat);
+ }
+
+ return buf;
+}
+
+static void isp_stat_bufs_free(struct ispstat *stat)
+{
+ struct isp_device *isp = stat->isp;
+ int i;
+
+ for (i = 0; i < STAT_MAX_BUFS; i++) {
+ struct ispstat_buffer *buf = &stat->buf[i];
+
+ if (!IS_COHERENT_BUF(stat)) {
+ if (IS_ERR_OR_NULL((void *)buf->iommu_addr))
+ continue;
+ if (buf->iovm)
+ dma_unmap_sg(isp->dev, buf->iovm->sgt->sgl,
+ buf->iovm->sgt->nents,
+ DMA_FROM_DEVICE);
+ omap_iommu_vfree(isp->domain, isp->dev,
+ buf->iommu_addr);
+ } else {
+ if (!buf->virt_addr)
+ continue;
+ dma_free_coherent(stat->isp->dev, stat->buf_alloc_size,
+ buf->virt_addr, buf->dma_addr);
+ }
+ buf->iommu_addr = 0;
+ buf->iovm = NULL;
+ buf->dma_addr = 0;
+ buf->virt_addr = NULL;
+ buf->empty = 1;
+ }
+
+ dev_dbg(stat->isp->dev, "%s: all buffers were freed.\n",
+ stat->subdev.name);
+
+ stat->buf_alloc_size = 0;
+ stat->active_buf = NULL;
+}
+
+static int isp_stat_bufs_alloc_iommu(struct ispstat *stat, unsigned int size)
+{
+ struct isp_device *isp = stat->isp;
+ int i;
+
+ stat->buf_alloc_size = size;
+
+ for (i = 0; i < STAT_MAX_BUFS; i++) {
+ struct ispstat_buffer *buf = &stat->buf[i];
+ struct iovm_struct *iovm;
+
+ WARN_ON(buf->dma_addr);
+ buf->iommu_addr = omap_iommu_vmalloc(isp->domain, isp->dev, 0,
+ size, IOMMU_FLAG);
+ if (IS_ERR((void *)buf->iommu_addr)) {
+ dev_err(stat->isp->dev,
+ "%s: Can't acquire memory for "
+ "buffer %d\n", stat->subdev.name, i);
+ isp_stat_bufs_free(stat);
+ return -ENOMEM;
+ }
+
+ iovm = omap_find_iovm_area(isp->dev, buf->iommu_addr);
+ if (!iovm ||
+ !dma_map_sg(isp->dev, iovm->sgt->sgl, iovm->sgt->nents,
+ DMA_FROM_DEVICE)) {
+ isp_stat_bufs_free(stat);
+ return -ENOMEM;
+ }
+ buf->iovm = iovm;
+
+ buf->virt_addr = omap_da_to_va(stat->isp->dev,
+ (u32)buf->iommu_addr);
+ buf->empty = 1;
+ dev_dbg(stat->isp->dev, "%s: buffer[%d] allocated."
+ "iommu_addr=0x%08lx virt_addr=0x%08lx",
+ stat->subdev.name, i, buf->iommu_addr,
+ (unsigned long)buf->virt_addr);
+ }
+
+ return 0;
+}
+
+static int isp_stat_bufs_alloc_dma(struct ispstat *stat, unsigned int size)
+{
+ int i;
+
+ stat->buf_alloc_size = size;
+
+ for (i = 0; i < STAT_MAX_BUFS; i++) {
+ struct ispstat_buffer *buf = &stat->buf[i];
+
+ WARN_ON(buf->iommu_addr);
+ buf->virt_addr = dma_alloc_coherent(stat->isp->dev, size,
+ &buf->dma_addr, GFP_KERNEL | GFP_DMA);
+
+ if (!buf->virt_addr || !buf->dma_addr) {
+ dev_info(stat->isp->dev,
+ "%s: Can't acquire memory for "
+ "DMA buffer %d\n", stat->subdev.name, i);
+ isp_stat_bufs_free(stat);
+ return -ENOMEM;
+ }
+ buf->empty = 1;
+
+ dev_dbg(stat->isp->dev, "%s: buffer[%d] allocated."
+ "dma_addr=0x%08lx virt_addr=0x%08lx\n",
+ stat->subdev.name, i, (unsigned long)buf->dma_addr,
+ (unsigned long)buf->virt_addr);
+ }
+
+ return 0;
+}
+
+static int isp_stat_bufs_alloc(struct ispstat *stat, u32 size)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&stat->isp->stat_lock, flags);
+
+ BUG_ON(stat->locked_buf != NULL);
+
+ /* Are the old buffers big enough? */
+ if (stat->buf_alloc_size >= size) {
+ spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
+ return 0;
+ }
+
+ if (stat->state != ISPSTAT_DISABLED || stat->buf_processing) {
+ dev_info(stat->isp->dev,
+ "%s: trying to allocate memory when busy\n",
+ stat->subdev.name);
+ spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
+ return -EBUSY;
+ }
+
+ spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
+
+ isp_stat_bufs_free(stat);
+
+ if (IS_COHERENT_BUF(stat))
+ return isp_stat_bufs_alloc_dma(stat, size);
+ else
+ return isp_stat_bufs_alloc_iommu(stat, size);
+}
+
+static void isp_stat_queue_event(struct ispstat *stat, int err)
+{
+ struct video_device *vdev = stat->subdev.devnode;
+ struct v4l2_event event;
+ struct omap3isp_stat_event_status *status = (void *)event.u.data;
+
+ memset(&event, 0, sizeof(event));
+ if (!err) {
+ status->frame_number = stat->frame_number;
+ status->config_counter = stat->config_counter;
+ } else {
+ status->buf_err = 1;
+ }
+ event.type = stat->event_type;
+ v4l2_event_queue(vdev, &event);
+}
+
+
+/*
+ * omap3isp_stat_request_statistics - Request statistics.
+ * @data: Pointer to return statistics data.
+ *
+ * Returns 0 if successful.
+ */
+int omap3isp_stat_request_statistics(struct ispstat *stat,
+ struct omap3isp_stat_data *data)
+{
+ struct ispstat_buffer *buf;
+
+ if (stat->state != ISPSTAT_ENABLED) {
+ dev_dbg(stat->isp->dev, "%s: engine not enabled.\n",
+ stat->subdev.name);
+ return -EINVAL;
+ }
+
+ mutex_lock(&stat->ioctl_lock);
+ buf = isp_stat_buf_get(stat, data);
+ if (IS_ERR(buf)) {
+ mutex_unlock(&stat->ioctl_lock);
+ return PTR_ERR(buf);
+ }
+
+ data->ts = buf->ts;
+ data->config_counter = buf->config_counter;
+ data->frame_number = buf->frame_number;
+ data->buf_size = buf->buf_size;
+
+ buf->empty = 1;
+ isp_stat_buf_release(stat);
+ mutex_unlock(&stat->ioctl_lock);
+
+ 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;
+
+ if (!new_conf) {
+ dev_dbg(stat->isp->dev, "%s: configuration is NULL\n",
+ stat->subdev.name);
+ return -EINVAL;
+ }
+
+ 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 ioct.
+ */
+ 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)
+{
+ 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 = 1 << 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;
+ me->ops = NULL;
+
+ return media_entity_init(me, 1, &stat->pad, 0);
+}
+
+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);
+}

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