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/*
* vsp1_dl.h -- R-Car VSP1 Display List
*
* Copyright (C) 2015 Renesas Corporation
*
* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/gfp.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)
struct vsp1_dl_header_list {
u32 num_bytes;
u32 addr;
} __attribute__((__packed__));
struct vsp1_dl_header {
u32 num_lists;
struct vsp1_dl_header_list lists[8];
u32 next_header;
u32 flags;
} __attribute__((__packed__));
struct vsp1_dl_entry {
u32 addr;
u32 data;
} __attribute__((__packed__));
/**
* struct vsp1_dl_body - Display list body
* @list: entry in the display list list of bodies
* @vsp1: the VSP1 device
* @entries: array of entries
* @dma: DMA address of the entries
* @size: size of the DMA memory in bytes
* @num_entries: number of stored entries
*/
struct vsp1_dl_body {
struct list_head list;
struct vsp1_device *vsp1;
struct vsp1_dl_entry *entries;
dma_addr_t dma;
size_t size;
unsigned int num_entries;
};
/**
* struct vsp1_dl_list - Display list
* @list: entry in the display list manager lists
* @dlm: the display list manager
* @header: display list header, NULL for headerless lists
* @dma: DMA address for the header
* @body0: first display list body
* @fragments: list of extra display list bodies
* @chain: entry in the display list partition chain
*/
struct vsp1_dl_list {
struct list_head list;
struct vsp1_dl_manager *dlm;
struct vsp1_dl_header *header;
dma_addr_t dma;
struct vsp1_dl_body body0;
struct list_head fragments;
bool has_chain;
struct list_head chain;
};
enum vsp1_dl_mode {
VSP1_DL_MODE_HEADER,
VSP1_DL_MODE_HEADERLESS,
};
/**
* struct vsp1_dl_manager - Display List manager
* @index: index of the related WPF
* @mode: display list operation mode (header or headerless)
* @vsp1: the VSP1 device
* @lock: protects the free, active, queued, pending and gc_fragments 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
* @gc_work: fragments garbage collector work struct
* @gc_fragments: array of display list fragments waiting to be freed
*/
struct vsp1_dl_manager {
unsigned int index;
enum vsp1_dl_mode mode;
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 work_struct gc_work;
struct list_head gc_fragments;
};
/* -----------------------------------------------------------------------------
* Display List Body Management
*/
/*
* Initialize a display list body object and allocate DMA memory for the body
* data. The display list body object is expected to have been initialized to
* 0 when allocated.
*/
static int vsp1_dl_body_init(struct vsp1_device *vsp1,
struct vsp1_dl_body *dlb, unsigned int num_entries,
size_t extra_size)
{
size_t size = num_entries * sizeof(*dlb->entries) + extra_size;
dlb->vsp1 = vsp1;
dlb->size = size;
dlb->entries = dma_alloc_wc(vsp1->bus_master, dlb->size, &dlb->dma,
GFP_KERNEL);
if (!dlb->entries)
return -ENOMEM;
return 0;
}
/*
* Cleanup a display list body and free allocated DMA memory allocated.
*/
static void vsp1_dl_body_cleanup(struct vsp1_dl_body *dlb)
{
dma_free_wc(dlb->vsp1->bus_master, dlb->size, dlb->entries, dlb->dma);
}
/**
* vsp1_dl_fragment_alloc - Allocate a display list fragment
* @vsp1: The VSP1 device
* @num_entries: The maximum number of entries that the fragment can contain
*
* Allocate a display list fragment with enough memory to contain the requested
* number of entries.
*
* Return a pointer to a fragment on success or NULL if memory can't be
* allocated.
*/
struct vsp1_dl_body *vsp1_dl_fragment_alloc(struct vsp1_device *vsp1,
unsigned int num_entries)
{
struct vsp1_dl_body *dlb;
int ret;
dlb = kzalloc(sizeof(*dlb), GFP_KERNEL);
if (!dlb)
return NULL;
ret = vsp1_dl_body_init(vsp1, dlb, num_entries, 0);
if (ret < 0) {
kfree(dlb);
return NULL;
}
return dlb;
}
/**
* vsp1_dl_fragment_free - Free a display list fragment
* @dlb: The fragment
*
* Free the given display list fragment and the associated DMA memory.
*
* Fragments must only be freed explicitly if they are not added to a display
* list, as the display list will take ownership of them and free them
* otherwise. Manual free typically happens at cleanup time for fragments that
* have been allocated but not used.
*
* Passing a NULL pointer to this function is safe, in that case no operation
* will be performed.
*/
void vsp1_dl_fragment_free(struct vsp1_dl_body *dlb)
{
if (!dlb)
return;
vsp1_dl_body_cleanup(dlb);
kfree(dlb);
}
/**
* vsp1_dl_fragment_write - Write a register to a display list fragment
* @dlb: The fragment
* @reg: The register address
* @data: The register value
*
* Write the given register and value to the display list fragment. The maximum
* number of entries that can be written in a fragment is specified when the
* fragment is allocated by vsp1_dl_fragment_alloc().
*/
void vsp1_dl_fragment_write(struct vsp1_dl_body *dlb, u32 reg, u32 data)
{
dlb->entries[dlb->num_entries].addr = reg;
dlb->entries[dlb->num_entries].data = data;
dlb->num_entries++;
}
/* -----------------------------------------------------------------------------
* 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_size;
int ret;
dl = kzalloc(sizeof(*dl), GFP_KERNEL);
if (!dl)
return NULL;
INIT_LIST_HEAD(&dl->fragments);
dl->dlm = dlm;
/*
* Initialize the display list body and allocate DMA memory for the body
* and the optional header. Both are allocated together to avoid memory
* fragmentation, with the header located right after the body in
* memory.
*/
header_size = dlm->mode == VSP1_DL_MODE_HEADER
? ALIGN(sizeof(struct vsp1_dl_header), 8)
: 0;
ret = vsp1_dl_body_init(dlm->vsp1, &dl->body0, VSP1_DL_NUM_ENTRIES,
header_size);
if (ret < 0) {
kfree(dl);
return NULL;
}
if (dlm->mode == VSP1_DL_MODE_HEADER) {
size_t header_offset = VSP1_DL_NUM_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;
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