// SPDX-License-Identifier: GPL-2.0+
/*
* vsp1_dl.c -- R-Car VSP1 Display List
*
* Copyright (C) 2015 Renesas Corporation
*
* Contact: Laurent Pinchart ([email protected])
*/
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/gfp.h>
#include <linux/refcount.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include "vsp1.h"
#include "vsp1_dl.h"
#define VSP1_DL_NUM_ENTRIES 256
#define VSP1_DLH_INT_ENABLE (1 << 1)
#define VSP1_DLH_AUTO_START (1 << 0)
#define VSP1_DLH_EXT_PRE_CMD_EXEC (1 << 9)
#define VSP1_DLH_EXT_POST_CMD_EXEC (1 << 8)
struct vsp1_dl_header_list {
u32 num_bytes;
u32 addr;
} __packed;
struct vsp1_dl_header {
u32 num_lists;
struct vsp1_dl_header_list lists[8];
u32 next_header;
u32 flags;
} __packed;
/**
* struct vsp1_dl_ext_header - Extended display list header
* @padding: padding zero bytes for alignment
* @pre_ext_dl_num_cmd: number of pre-extended command bodies to parse
* @flags: enables or disables execution of the pre and post command
* @pre_ext_dl_plist: start address of pre-extended display list bodies
* @post_ext_dl_num_cmd: number of post-extended command bodies to parse
* @post_ext_dl_plist: start address of post-extended display list bodies
*/
struct vsp1_dl_ext_header {
u32 padding;
/*
* The datasheet represents flags as stored before pre_ext_dl_num_cmd,
* expecting 32-bit accesses. The flags are appropriate to the whole
* header, not just the pre_ext command, and thus warrant being
* separated out. Due to byte ordering, and representing as 16 bit
* values here, the flags must be positioned after the
* pre_ext_dl_num_cmd.
*/
u16 pre_ext_dl_num_cmd;
u16 flags;
u32 pre_ext_dl_plist;
u32 post_ext_dl_num_cmd;
u32 post_ext_dl_plist;
} __packed;
struct vsp1_dl_header_extended {
struct vsp1_dl_header header;
struct vsp1_dl_ext_header ext;
} __packed;
struct vsp1_dl_entry {
u32 addr;
u32 data;
} __packed;
/**
* struct vsp1_pre_ext_dl_body - Pre Extended Display List Body
* @opcode: Extended display list command operation code
* @flags: Pre-extended command flags. These are specific to each command
* @address_set: Source address set pointer. Must have 16-byte alignment
* @reserved: Zero bits for alignment.
*/
struct vsp1_pre_ext_dl_body {
u32 opcode;
u32 flags;
u32 address_set;
u32 reserved;
} __packed;
/**
* struct vsp1_dl_body - Display list body
* @list: entry in the display list list of bodies
* @free: entry in the pool free body list
* @refcnt: reference tracking for the body
* @pool: pool to which this body belongs
* @entries: array of entries
* @dma: DMA address of the entries
* @size: size of the DMA memory in bytes
* @num_entries: number of stored entries
* @max_entries: number of entries available
*/
struct vsp1_dl_body {
struct list_head list;
struct list_head free;
refcount_t refcnt;
struct vsp1_dl_body_pool *pool;
struct vsp1_dl_entry *entries;
dma_addr_t dma;
size_t size;
unsigned int num_entries;
unsigned int max_entries;
};
/**
* struct vsp1_dl_body_pool - display list body pool
* @dma: DMA address of the entries
* @size: size of the full DMA memory pool in bytes
* @mem: CPU memory pointer for the pool
* @bodies: Array of DLB structures for the pool
* @free: List of free DLB entries
* @lock: Protects the free list
* @vsp1: the VSP1 device
*/
struct vsp1_dl_body_pool {
/* DMA allocation */
dma_addr_t dma;
size_t size;
void *mem;
/* Body management */
struct vsp1_dl_body *bodies;
struct list_head free;
spinlock_t lock;
struct vsp1_device *vsp1;
};
/**
* struct vsp1_dl_cmd_pool - Display List commands pool
* @dma: DMA address of the entries
* @size: size of the full DMA memory pool in bytes
* @mem: CPU memory pointer for the pool
* @cmds: Array of command structures for the pool
* @free: Free pool entries
* @lock: Protects the free list
* @vsp1: the VSP1 device
*/
struct vsp1_dl_cmd_pool {
/* DMA allocation */
dma_addr_t dma;
size_t size;
void *mem;
struct vsp1_dl_ext_cmd *cmds;
struct list_head free;
spinlock_t lock;
struct vsp1_device *vsp1;
};
/**
* struct vsp1_dl_list - Display list
* @list: entry in the display list manager lists
* @dlm: the display list manager
* @header: display list header
* @extension: extended display list header. NULL for normal lists
* @dma: DMA address for the header
* @body0: first display list body
* @bodies: list of extra display list bodies
* @pre_cmd: pre command to be issued through extended dl header
* @post_cmd: post command to be issued through extended dl header
* @has_chain: if true, indicates that there's a partition chain
* @chain: entry in the display list partition chain
* @flags: display list flags, a combination of VSP1_DL_FRAME_END_*
*/
struct vsp1_dl_list {
struct list_head list;
struct vsp1_dl_manager *dlm;
struct vsp1_dl_header *header;
struct vsp1_dl_ext_header *extension;
dma_addr_t dma;
struct vsp1_dl_body *body0;
struct list_head bodies;
struct vsp1_dl_ext_cmd *pre_cmd;
struct vsp1_dl_ext_cmd *post_cmd;
bool has_chain;
struct list_head chain;
unsigned int flags;
};
/**
* struct vsp1_dl_manager - Display List manager
* @index: index of the related WPF
* @singleshot: execute the display list in single-shot mode
* @vsp1: the VSP1 device
* @lock: protects the free, active, queued, and pending lists
* @free: array of all free display lists
* @active: list currently being processed (loaded) by hardware
* @queued: list queued to the hardware (written to the DL registers)
* @pending: list waiting to be queued to the hardware
* @pool: body pool for the display list bodies
* @cmdpool: commands pool for extended display list
*/
struct vsp1_dl_manager {
unsigned int index;
bool singleshot;
struct vsp1_device *vsp1;
spinlock_t lock;
struct list_head free;
struct vsp1_dl_list *active;
struct vsp1_dl_list *queued;
struct vsp1_dl_list *pending;
struct vsp1_dl_body_pool *pool;
struct vsp1_dl_cmd_pool *cmdpool;
};
/* -----------------------------------------------------------------------------
* Display List Body Management
*/
/**
* vsp1_dl_body_pool_create - Create a pool of bodies from a single allocation
* @vsp1: The VSP1 device
* @num_bodies: The number of bodies to allocate
* @num_entries: The maximum number of entries that a body can contain
* @extra_size: Extra allocation provided for the bodies
*
* Allocate a pool of display list bodies each with enough memory to contain the
* requested number of entries plus the @extra_size.
*
* Return a pointer to a pool on success or NULL if memory can't be allocated.
*/
struct vsp1_dl_body_pool *
vsp1_dl_body_pool_create(struct vsp1_device *vsp1, unsigned int num_bodies,
unsigned int num_entries, size_t extra_size)
{
struct vsp1_dl_body_pool *pool;
size_t dlb_size;
unsigned int i;
pool = kzalloc(sizeof(*pool), GFP_KERNEL);
if (!pool)
return NULL;
pool->vsp1 = vsp1;
/*
* TODO: 'extra_size' is only used by vsp1_dlm_create(), to allocate
* extra memory for the display list header. We need only one header per
* display list, not per display list body, thus this allocation is
* extraneous and should be reworked in the future.
*/
dlb_size = num_entries * sizeof(struct vsp1_dl_entry) + extra_size;
pool->size = dlb_size * num_bodies;
pool->bodies = kcalloc(num_bodies, sizeof(*pool->bodies), GFP_KERNEL);
if (!pool->bodies) {
kfree(pool);
return NULL;
}
pool->mem = dma_alloc_wc(vsp1->bus_master, pool->size, &pool->dma,
GFP_KERNEL);
if (!pool->mem) {
kfree(pool->bodies);
kfree(pool);
return NULL;
}
spin_lock_init(&pool->lock);
INIT_LIST_HEAD(&pool->free);
for (i = 0; i < num_bodies; ++i) {
struct vsp1_dl_body *dlb = &pool->bodies[i];
dlb->pool = pool;
dlb->max_entries = num_entries;
dlb->dma = pool->dma + i * dlb_size;
dlb->entries = pool->mem + i * dlb_size;
list_add_tail(&dlb->free, &pool->free);
}
return pool;
}
/**
* vsp1_dl_body_pool_destroy - Release a body pool
* @pool: The body pool
*
* Release all components of a pool allocation.
*/
void vsp1_dl_body_pool_destroy(struct vsp1_dl_body_pool *pool)
{
if (!pool)
return;
if (pool->mem)
dma_free_wc(pool->vsp1->bus_master, pool->size, pool->mem,
pool->dma);
kfree(pool->bodies);
kfree(pool);
}
/**
* vsp1_dl_body_get - Obtain a body from a pool
* @pool: The body pool
*
* Obtain a body from the pool without blocking.
*
* Returns a display list body or NULL if there are none available.
*/
struct vsp1_dl_body *vsp1_dl_body_get(struct vsp1_dl_body_pool *pool)
{
struct vsp1_dl_body *dlb = NULL;
unsigned long flags;
spin_lock_irqsave(&pool->lock, flags);
if (!list_empty(&pool->free)) {
dlb = list_first_entry(&pool->free, struct vsp1_dl_body, free);
list_del(&dlb->free);
refcount_set(&dlb->refcnt, 1);
}
spin_unlock_irqrestore(&pool->lock, flags);
return dlb;
}
/**
* vsp1_dl_body_put - Return a body back to its pool
* @dlb: The display list body
*
* Return a body back to the pool, and reset the num_entries to clear the list.
*/
void vsp1_dl_body_put(struct vsp1_dl_body *dlb)
{
unsigned long flags;
if (!dlb)
return;
if (!refcount_dec_and_test(&dlb->refcnt))
return;
dlb->num_entries = 0;
spin_lock_irqsave(&dlb->pool->lock, flags);
list_add_tail(&dlb->free, &dlb->pool->free);
spin_unlock_irqrestore(&dlb->pool->lock, flags);
}
/**
* vsp1_dl_body_write - Write a register to a display list body
* @dlb: The body
* @reg: The register address
* @data: The register value
*
* Write the given register and value to the display list body. The maximum
* number of entries that can be written in a body is specified when the body is
* allocated by vsp1_dl_body_alloc().
*/
void vsp1_dl_body_write(struct vsp1_dl_body *dlb, u32 reg, u32 data)
{
if (WARN_ONCE(dlb->num_entries >= dlb->max_entries,
"DLB size exceeded (max %u)", dlb->max_entries))
return;
dlb->entries[dlb->num_entries].addr = reg;
dlb->entries[dlb->num_entries].data = data;
dlb->num_entries++;
}
/* -----------------------------------------------------------------------------
* Display List Extended Command Management
*/
enum vsp1_extcmd_type {
VSP1_EXTCMD_AUTODISP,
VSP1_EXTCMD_AUTOFLD,
};
struct vsp1_extended_command_info {
u16 opcode;
size_t body_size;
};
static const struct vsp1_extended_command_info vsp1_extended_commands[] = {
[VSP1_EXTCMD_AUTODISP] = { 0x02, 96 },
[VSP1_EXTCMD_AUTOFLD] = { 0x03, 160 },
};
/**
* vsp1_dl_cmd_pool_create - Create a pool of commands from a single allocation
* @vsp1: The VSP1 device
* @type: The command pool type
* @num_cmds: The number of commands to allocate
*
* Allocate a pool of commands each with enough memory to contain the private
* data of each command. The allocation sizes are dependent upon the command
* type.
*
* Return a pointer to the pool on success or NULL if memory can't be allocated.
*/
static struct vsp1_dl_cmd_pool *
vsp1_dl_cmd_pool_create(struct vsp1_device *vsp1, enum vsp1_extcmd_type type,
unsigned int num_cmds)
{
struct vsp1_dl_cmd_pool *pool;
unsigned int i;
size_t cmd_size;
pool = kzalloc(sizeof(*pool), GFP_KERNEL);
if (!pool)
return NULL;
pool->vsp1 = vsp1;
spin_lock_init(&pool->lock);
INIT_LIST_HEAD(&pool->free);
pool->cmds = kcalloc(num_cmds, sizeof(*pool->cmds), GFP_KERNEL);
if (!pool->cmds) {
kfree(pool);
return NULL;
}
cmd_size = sizeof(struct vsp1_pre_ext_dl_body) +
vsp1_extended_commands[type].body_size;
cmd_size = ALIGN(cmd_size, 16);
pool->size = cmd_size * num_cmds;
pool->mem = dma_alloc_wc(vsp1->bus_master, pool->size, &pool->dma,
GFP_KERNEL);
if (!pool->mem) {
kfree(pool->cmds);
kfree(pool);
return NULL;
}
for (i = 0; i < num_cmds; ++i) {
struct vsp1_dl_ext_cmd *cmd = &pool->cmds[i];
size_t cmd_offset = i * cmd_size;
/* data_offset must be 16 byte aligned for DMA. */
size_t data_offset = sizeof(struct vsp1_pre_ext_dl_body) +
cmd_offset;
cmd->pool = pool;
cmd->opcode = vsp1_extended_commands[type].opcode;
/*
* TODO: Auto-disp can utilise more than one extended body
* command per cmd.
*/
cmd->num_cmds = 1;
cmd->cmds = pool->mem + cmd_offset;
cmd->cmd_dma = pool->dma + cmd_offset;
cmd->data = pool->mem + data_offset;
cmd->data_dma = pool->dma + data_offset;
list_add_tail(&cmd->free, &pool->free);
}
return pool;
}
static
struct vsp1_dl_ext_cmd *vsp1_dl_ext_cmd_get(struct vsp1_dl_cmd_pool *pool)
{
struct vsp1_dl_ext_cmd *cmd = NULL;
unsigned long flags;
spin_lock_irqsave(&pool->lock, flags);
if (!list_empty(&pool->free)) {
cmd = list_first_entry(&pool->free, struct vsp1_dl_ext_cmd,
free);
list_del(&cmd->free);
}
spin_unlock_irqrestore(&pool->lock, flags);
return cmd;
}
static void vsp1_dl_ext_cmd_put(struct vsp1_dl_ext_cmd *cmd)
{
unsigned long flags;
if (!cmd)
return;
/* Reset flags, these mark data usage. */
cmd->flags = 0;
spin_lock_irqsave(&cmd->pool->lock, flags);
list_add_tail(&cmd->free, &cmd->pool->free);
spin_unlock_irqrestore(&cmd->pool->lock, flags);
}
static void vsp1_dl_ext_cmd_pool_destroy(struct vsp1_dl_cmd_pool *pool)
{
if (!pool)
return;
if (pool->mem)
dma_free_wc(pool->vsp1->bus_master, pool->size, pool->mem,
pool->dma);
kfree(pool->cmds);
kfree(pool);
}
struct vsp1_dl_ext_cmd *vsp1_dl_get_pre_cmd(struct vsp1_dl_list *dl)
{
struct vsp1_dl_manager *dlm = dl->dlm;
if (dl->pre_cmd)
return dl->pre_cmd;
dl->pre_cmd = vsp1_dl_ext_cmd_get(dlm->cmdpool);
return dl->pre_cmd;
}
/* ----------------------------------------------------------------------------
* Display List Transaction Management
*/
static struct vsp1_dl_list *vsp1_dl_list_alloc(struct vsp1_dl_manager *dlm)
{
struct vsp1_dl_list *dl;
size_t header_offset;
dl = kzalloc(sizeof(*dl), GFP_KERNEL);
if (!dl)
return NULL;
INIT_LIST_HEAD(&dl->bodies);
dl->dlm = dlm;
/* Get a default body for our list. */
dl->body0 = vsp1_dl_body_get(dlm->pool);
if (!dl->body0) {
kfree(dl);
return NULL;
}
header_offset = dl->body0->max_entries * sizeof(*dl->body0->entries);
dl->header = ((void *)dl->body0->entries) + header_offset;
dl->dma = dl->body0->dma + header_offset;
memset(dl->header, 0, sizeof(*dl->header));
dl->header->lists[0].addr = dl->body0->dma;
return dl;
}
static void vsp1_dl_list_bodies_put(struct vsp1_dl_list *dl)
{
struct vsp1_dl_body *dlb, *tmp;
list_for_each_entry_safe(dlb, tmp, &dl->bodies, list) {
list_del(&dlb->list);
vsp1_dl_body_put(dlb);
}
}
static void vsp1_dl_list_free(struct vsp1_dl_list *dl)
{
vsp1_dl_body_put(dl->body0);
vsp1_dl_list_bodies_put(dl);
kfree(dl);
}
/**
* vsp1_dl_list_get - Get a free display list
* @dlm: The display list manager
*
* Get a display list from the pool of free lists and return it.
*
* This function must be called without the display list manager lock held.
*/
struct vsp1_dl_list *vsp1_dl_list_get(struct vsp1_dl_manager *dlm)
{
struct vsp1_dl_list *dl = NULL;
unsigned long flags;
spin_lock_irqsave(&dlm->lock, flags);
if (!list_empty(&dlm->free)) {
dl = list_first_entry(&dlm->free, struct vsp1_dl_list, list);
list_del(&dl->list);
/*
* The display list chain must be initialised to ensure every
* display list can assert list_empty() if it is not in a chain.
*/
INIT_LIST_HEAD(&dl->chain);
}
spin_unlock_irqrestore(&dlm->lock, flags);
return dl;
}
/* This function must be called with the display list manager lock held.*/
static void __vsp1_dl_list_put(struct vsp1_dl_list *dl)
{
struct vsp1_dl_list *dl_next;
if (!dl)
return;
/*
* Release any linked display-lists which were chained for a single
* hardware operation.
*/
if (dl->has_chain) {
list_for_each_entry(dl_next, &dl->chain, chain)
__vsp1_dl_list_put(dl_next);
}
dl->has_chain = false;
vsp1_dl_list_bodies_put(dl);
vsp1_dl_ext_cmd_put(dl->pre_cmd);
vsp1_dl_ext_cmd_put(dl->post_cmd);
dl->pre_cmd = NULL;
dl->post_cmd = NULL;
/*
* body0 is reused as as an optimisation as presently every display list
* has at least one body, thus we reinitialise the entries list.
*/
dl->body0->num_entries = 0;
list_add_tail(&dl->list, &dl->dlm->free);
}
/**
* vsp1_dl_list_put - Release a display list
* @dl: The display list
*
* Release the display list and return it to the pool of free lists.
*
* Passing a NULL pointer to this function is safe, in that case no operation
* will be performed.
*/
void vsp1_dl_list_put(struct vsp1_dl_list *dl)
{
unsigned long flags;
if (!dl)
return;
spin_lock_irqsave(&dl->dlm->lock, flags);
__vsp1_dl_list_put(dl);
spin_unlock_irqrestore(&dl->dlm->lock, flags);
}
/**
* vsp1_dl_list_get_body0 - Obtain the default body for the display list
* @dl: The display list
*
* Obtain a pointer to the internal display list body allowing this to be passed
* directly to configure operations.
*/
struct vsp1_dl_body *vsp1_dl_list_get_body0(struct vsp1_dl_list *dl)
{
return dl->body0;
}
/**
* vsp1_dl_list_add_body - Add a body to the display list
* @dl: The display list
* @dlb: The body
*
* Add a display list body to a display list. Registers contained in bodies are
* processed after registers contained in the main display list, in the order in
* which bodies are added.
*
* Adding a body to a display list passes ownership of the body to the list. The
* caller retains its reference to the body when adding it to the display list,
* but is not allowed to add new entries to the body.
*
* The reference must be explicitly released by a call to vsp1_dl_body_put()
* when the body isn't needed anymore.
*/
int vsp1_dl_list_add_body(struct vsp1_dl_list *dl, struct vsp1_dl_body *dlb)
{
refcount_inc(&dlb->refcnt);
list_add_tail(&dlb->list, &dl->bodies);
return 0;
}
/**
* vsp1_dl_list_add_chain - Add a display list to a chain
* @head: The head display list
* @dl: The new display list
*
* Add a display list to an existing display list chain. The chained lists
* will be automatically processed by the hardware without intervention from
* the CPU. A display list end interrupt will only complete after the last
* display list in the chain has completed processing.
*
* Adding a display list to a chain passes ownership of the display list to
* the head display list item. The chain is released when the head dl item is
* put back with __vsp1_dl_list_put().
*/
int vsp1_dl_list_add_chain(struct vsp1_dl_list *head,
struct vsp1_dl_list *dl)
{
head->has_chain = true;
list_add_tail(&dl->chain, &head->chain);
return 0;
}
static void vsp1_dl_ext_cmd_fill_header(struct vsp1_dl_ext_cmd *cmd)
{
cmd->cmds[0].opcode = cmd->opcode;
cmd->cmds[0].flags = cmd->flags;
cmd->cmds[0].address_set = cmd->data_dma;
cmd->cmds[0].reserved = 0;
}
static void vsp1_dl_list_fill_header(struct vsp1_dl_list *dl, bool is_last)
{
struct vsp1_dl_manager *dlm = dl->dlm;
struct vsp1_dl_header_list *hdr = dl->header->lists;
struct vsp1_dl_body *dlb;
unsigned int num_lists = 0;
/*
* Fill the header with the display list bodies addresses and sizes. The
* address of the first body has already been filled when the display
* list was allocated.
*/
hdr->num_bytes = dl->body0->num_entries
* sizeof(*dl->header->lists);
list_for_each_entry(dlb, &dl->bodies, list) {
num_lists++;
hdr++;
hdr->addr = dlb->dma;
hdr->num_bytes = dlb->num_entries
* sizeof(*dl->header->lists);
}
dl->header->num_lists = num_lists;
dl->header->flags = 0;
/*
* Enable the interrupt for the end of each frame. In continuous mode
* chained lists are used with one list per frame, so enable the
* interrupt for each list. In singleshot mode chained lists are used
* to partition a single frame, so enable the interrupt for the last
* list only.
*/
if (!dlm->singleshot || is_last)
dl->header->flags |= VSP1_DLH_INT_ENABLE;
/*
* In continuous mode enable auto-start for all lists, as the VSP must
* loop on the same list until a new one is queued. In singleshot mode
* enable auto-start for all lists but the last to chain processing of
* partitions without software intervention.
*/
if (!dlm->singleshot || !is_last)
dl->header->flags |= VSP1_DLH_AUTO_START;
if (!is_last) {
/*
* If this is not the last display list in the chain, queue the
* next item for automatic processing by the hardware.
*/
struct vsp1_dl_list *next = list_next_entry(dl, chain);
dl->header->next_header = next->dma;
} else if (!dlm->singleshot) {
/*
* if the display list manager works in continuous mode, the VSP
* should loop over the display list continuously until
* instructed to do otherwise.
*/
dl->header->next_header = dl->dma;
}
if (!dl->extension)
return;
dl->extension->flags = 0;
if (dl->pre_cmd) {
dl->extension->pre_ext_dl_plist = dl->pre_cmd->cmd_dma;
dl->extension->pre_ext_dl_num_cmd = dl->pre_cmd->num_cmds;
dl->extension->flags |= VSP1_DLH_EXT_PRE_CMD_EXEC;
vsp1_dl_ext_cmd_fill_header(dl->pre_cmd);
}
if (dl->post_cmd) {
dl->extension->post_ext_dl_plist = dl->post_cmd->cmd_dma;
dl->extension->post_ext_dl_num_cmd = dl->post_cmd->num_cmds;
dl->extension->flags |= VSP1_DLH_EXT_POST_CMD_EXEC;
vsp1_dl_ext_cmd_fill_header(dl->post_cmd);
}
}
static bool vsp1_dl_list_hw_update_pending(struct vsp1_dl_manager *dlm)
{
struct vsp1_device *vsp1 = dlm->vsp1;
if (!dlm->queued)
return false;
/*
* Check whether the VSP1 has taken the update. The hardware indicates
* this by clearing the UPDHDR bit in the CMD register.
*/
return !!(vsp1_read(vsp1, VI6_CMD(dlm->index)) & VI6_CMD_UPDHDR);
}
static void vsp1_dl_list_hw_enqueue(struct vsp1_dl_list *dl)
{
struct vsp1_dl_manager *dlm = dl->dlm;
struct vsp1_device *vsp1 = dlm->vsp1;
/*
* Program the display list header address. If the hardware is idle
* (single-shot mode or first frame in continuous mode) it will then be
* started independently. If the hardware is operating, the
* VI6_DL_HDR_REF_ADDR register will be updated with the display list
* address.
*/
vsp1_write(vsp1, VI6_DL_HDR_ADDR(dlm->index), dl->dma);
}
static void vsp1_dl_list_commit_continuous(struct vsp1_dl_list *dl)
{
struct vsp1_dl_manager *dlm = dl->dlm;
/*
* If a previous display list has been queued to the hardware but not
* processed yet, the VSP can start processing it at any time. In that
* case we can't replace the queued list by the new one, as we could
* race with the hardware. We thus mark the update as pending, it will
* be queued up to the hardware by the frame end interrupt handler.
*
* If a display list is already pending we simply drop it as the new
* display list is assumed to contain a more recent configuration. It is
* an error if the already pending list has the
* VSP1_DL_FRAME_END_INTERNAL flag set, as there is then a process
* waiting for that list to complete. This shouldn't happen as the
* waiting process should perform proper locking, but warn just in
* case.
*/
if (vsp1_dl_list_hw_update_pending(dlm)) {
WARN_ON(dlm->pending &&
(dlm->pending->flags & VSP1_DL_FRAME_END_INTERNAL));
__vsp1_dl_list_put(dlm->pending);
dlm->pending = dl;
return;
}
/*
* Pass the new display list to the hardware and mark it as queued. It
* will become active when the hardware starts processing it.
*/
vsp1_dl_list_hw_enqueue(dl);
__vsp1_dl_list_put(dlm->queued);
dlm->queued = dl;
}
static void vsp1_dl_list_commit_singleshot(struct vsp1_dl_list *dl)
{
struct vsp1_dl_manager *dlm = dl->dlm;
/*
* When working in single-shot mode, the caller guarantees that the
* hardware is idle at this point. Just commit the head display list
* to hardware. Chained lists will be started automatically.
*/
vsp1_dl_list_hw_enqueue(dl);
dlm->active = dl;
}
void vsp1_dl_list_commit(struct vsp1_dl_list *dl, unsigned int dl_flags)
{
struct vsp1_dl_manager *dlm = dl->dlm;
struct vsp1_dl_list *dl_next;
unsigned long flags;
/* Fill the header for the head and chained display lists. */
vsp1_dl_list_fill_header(dl, list_empty(&dl->chain));
list_for_each_entry(dl_next, &dl->chain, chain) {
bool last = list_is_last(&dl_next->chain, &dl->chain);
vsp1_dl_list_fill_header(dl_next, last);
}
dl->flags = dl_flags & ~VSP1_DL_FRAME_END_COMPLETED;
spin_lock_irqsave(&dlm->lock, flags);
if (dlm->singleshot)
vsp1_dl_list_commit_singleshot(dl);
else
vsp1_dl_list_commit_continuous(dl);
spin_unlock_irqrestore(&dlm->lock, flags);
}
/* -----------------------------------------------------------------------------
* Display List Manager
*/
/**
* vsp1_dlm_irq_frame_end - Display list handler for the frame end interrupt
* @dlm: the display list manager
*
* Return a set of flags that indicates display list completion status.
*
* The VSP1_DL_FRAME_END_COMPLETED flag indicates that the previous display list
* has completed at frame end. If the flag is not returned display list
* completion has been delayed by one frame because the display list commit
* raced with the frame end interrupt. The function always returns with the flag
* set in single-shot mode as display list processing is then not continuous and
* races never occur.
*
* The following flags are only supported for continuous mode.
*
* The VSP1_DL_FRAME_END_INTERNAL flag indicates that the display list that just
* became active had been queued with the internal notification flag.
*
* The VSP1_DL_FRAME_END_WRITEBACK flag indicates that the previously active
* display list had been queued with the writeback flag.
*/
unsigned int vsp1_dlm_irq_frame_end(struct vsp1_dl_manager *dlm)
{
struct vsp1_device *vsp1 = dlm->vsp1;
u32 status = vsp1_read(vsp1, VI6_STATUS);
unsigned int flags = 0;
spin_lock(&dlm->lock);
/*
* The mem-to-mem pipelines work in single-shot mode. No new display
* list can be queued, we don't have to do anything.
*/
if (dlm->singleshot) {
__vsp1_dl_list_put(dlm->active);
dlm->active = NULL;
flags |= VSP1_DL_FRAME_END_COMPLETED;
goto done;
}
/*
* If the commit operation raced with the interrupt and occurred after
* the frame end event but before interrupt processing, the hardware
* hasn't taken the update into account yet. We have to skip one frame
* and retry.
*/
if (vsp1_dl_list_hw_update_pending(dlm))
goto done;
/*
* Progressive streams report only TOP fields. If we have a BOTTOM
* field, we are interlaced, and expect the frame to complete on the
* next frame end interrupt.
*/
if (status & VI6_STATUS_FLD_STD(dlm->index))
goto done;
/*
* If the active display list has the writeback flag set, the frame
* completion marks the end of the writeback capture. Return the
* VSP1_DL_FRAME_END_WRITEBACK flag and reset the display list's
* writeback flag.
*/
if (dlm->active && (dlm->active->flags & VSP1_DL_FRAME_END_WRITEBACK)) {
flags |= VSP1_DL_FRAME_END_WRITEBACK;
dlm->active->flags &= ~VSP1_DL_FRAME_END_WRITEBACK;
}
/*
* The device starts processing the queued display list right after the
* frame end interrupt. The display list thus becomes active.
*/
if (dlm->queued) {
if (dlm->queued->flags & VSP1_DL_FRAME_END_INTERNAL)
flags |= VSP1_DL_FRAME_END_INTERNAL;
dlm->queued->flags &= ~VSP1_DL_FRAME_END_INTERNAL;
__vsp1_dl_list_put(dlm->active);
dlm->active = dlm->queued;
dlm->queued = NULL;
flags |= VSP1_DL_FRAME_END_COMPLETED;
}
/*
* Now that the VSP has started processing the queued display list, we
* can queue the pending display list to the hardware if one has been
* prepared.
*/
if (dlm->pending) {
vsp1_dl_list_hw_enqueue(dlm->pending);
dlm->queued = dlm->pending;
dlm->pending = NULL;
}
done:
spin_unlock(&dlm->lock);
return flags;
}
/* Hardware Setup */
void vsp1_dlm_setup(struct vsp1_device *vsp1)
{
unsigned int i;
u32 ctrl = (256 << VI6_DL_CTRL_AR_WAIT_SHIFT)
| VI6_DL_CTRL_DC2 | VI6_DL_CTRL_DC1 | VI6_DL_CTRL_DC0
| VI6_DL_CTRL_DLE;
u32 ext_dl = (0x02 << VI6_DL_EXT_CTRL_POLINT_SHIFT)
| VI6_DL_EXT_CTRL_DLPRI | VI6_DL_EXT_CTRL_EXT;
if (vsp1_feature(vsp1, VSP1_HAS_EXT_DL)) {
for (i = 0; i < vsp1->info->wpf_count; ++i)
vsp1_write(vsp1, VI6_DL_EXT_CTRL(i), ext_dl);
}
vsp1_write(vsp1, VI6_DL_CTRL, ctrl);
vsp1_write(vsp1, VI6_DL_SWAP, VI6_DL_SWAP_LWS);
}
void vsp1_dlm_reset(struct vsp1_dl_manager *dlm)
{
unsigned long flags;
spin_lock_irqsave(&dlm->lock, flags);
__vsp1_dl_list_put(dlm->active);
__vsp1_dl_list_put(dlm->queued);
__vsp1_dl_list_put(dlm->pending);
spin_unlock_irqrestore(&dlm->lock, flags);
dlm->active = NULL;
dlm->queued = NULL;
dlm->pending = NULL;
}
struct vsp1_dl_body *vsp1_dlm_dl_body_get(struct vsp1_dl_manager *dlm)
{
return vsp1_dl_body_get(dlm->pool);
}
struct vsp1_dl_manager *vsp1_dlm_create(struct vsp1_device *vsp1,
unsigned int index,
unsigned int prealloc)
{
struct vsp1_dl_manager *dlm;
size_t header_size;
unsigned int i;
dlm = devm_kzalloc(vsp1->dev, sizeof(*dlm), GFP_KERNEL);
if (!dlm)
return NULL;
dlm->index = index;
dlm->singleshot = vsp1->info->uapi;
dlm->vsp1 = vsp1;
spin_lock_init(&dlm->lock);
INIT_LIST_HEAD(&dlm->free);
/*
* Initialize the display list body and allocate DMA memory for the body
* and the header. Both are allocated together to avoid memory
* fragmentation, with the header located right after the body in
* memory. An extra body is allocated on top of the prealloc to account
* for the cached body used by the vsp1_pipeline object.
*/
header_size = vsp1_feature(vsp1, VSP1_HAS_EXT_DL) ?
sizeof(struct vsp1_dl_header_extended) :
sizeof(struct vsp1_dl_header);
header_size = ALIGN(header_size, 8);
dlm->pool = vsp1_dl_body_pool_create(vsp1, prealloc + 1,
VSP1_DL_NUM_ENTRIES, header_size);
if (!dlm->pool)
return NULL;
for (i = 0; i < prealloc; ++i) {
struct vsp1_dl_list *dl;
dl = vsp1_dl_list_alloc(dlm);
if (!dl) {
vsp1_dlm_destroy(dlm);
return NULL;
}
/* The extended header immediately follows the header. */
if (vsp1_feature(vsp1, VSP1_HAS_EXT_DL))
dl->extension = (void *)dl->header
+ sizeof(*dl->header);
list_add_tail(&dl->list, &dlm->free);
}
if (vsp1_feature(vsp1, VSP1_HAS_EXT_DL)) {
dlm->cmdpool = vsp1_dl_cmd_pool_create(vsp1,
VSP1_EXTCMD_AUTOFLD, prealloc);
if (!dlm->cmdpool) {
vsp1_dlm_destroy(dlm);
return NULL;
}
}
return dlm;
}
void vsp1_dlm_destroy(struct vsp1_dl_manager *dlm)
{
struct vsp1_dl_list *dl, *next;
if (!dlm)
return;
list_for_each_entry_safe(dl, next, &dlm->free, list) {
list_del(&dl->list);
vsp1_dl_list_free(dl);
}
vsp1_dl_body_pool_destroy(dlm->pool);
vsp1_dl_ext_cmd_pool_destroy(dlm->cmdpool);
}
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