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linux/drivers/gpu/ipu-v3/ipu-pre.c
Lucas Stach 0a29b1abaf gpu: ipu-v3: pre: add double buffer status readback 
This allows the upper layers to check if a double buffer update has
been applied by the PRE or is still pending.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
[p.zabel@pengutronix.de: inverted logic: done -> pending]
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
2019-02-22 11:58:45 +01:00

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/*
* Copyright (c) 2017 Lucas Stach, Pengutronix
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <drm/drm_fourcc.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/genalloc.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <video/imx-ipu-v3.h>
#include "ipu-prv.h"
#define IPU_PRE_MAX_WIDTH 2048
#define IPU_PRE_NUM_SCANLINES 8
#define IPU_PRE_CTRL 0x000
#define IPU_PRE_CTRL_SET 0x004
#define IPU_PRE_CTRL_ENABLE (1 << 0)
#define IPU_PRE_CTRL_BLOCK_EN (1 << 1)
#define IPU_PRE_CTRL_BLOCK_16 (1 << 2)
#define IPU_PRE_CTRL_SDW_UPDATE (1 << 4)
#define IPU_PRE_CTRL_VFLIP (1 << 5)
#define IPU_PRE_CTRL_SO (1 << 6)
#define IPU_PRE_CTRL_INTERLACED_FIELD (1 << 7)
#define IPU_PRE_CTRL_HANDSHAKE_EN (1 << 8)
#define IPU_PRE_CTRL_HANDSHAKE_LINE_NUM(v) ((v & 0x3) << 9)
#define IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN (1 << 11)
#define IPU_PRE_CTRL_EN_REPEAT (1 << 28)
#define IPU_PRE_CTRL_TPR_REST_SEL (1 << 29)
#define IPU_PRE_CTRL_CLKGATE (1 << 30)
#define IPU_PRE_CTRL_SFTRST (1 << 31)
#define IPU_PRE_CUR_BUF 0x030
#define IPU_PRE_NEXT_BUF 0x040
#define IPU_PRE_TPR_CTRL 0x070
#define IPU_PRE_TPR_CTRL_TILE_FORMAT(v) ((v & 0xff) << 0)
#define IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK 0xff
#define IPU_PRE_TPR_CTRL_TILE_FORMAT_16_BIT (1 << 0)
#define IPU_PRE_TPR_CTRL_TILE_FORMAT_SPLIT_BUF (1 << 4)
#define IPU_PRE_TPR_CTRL_TILE_FORMAT_SINGLE_BUF (1 << 5)
#define IPU_PRE_TPR_CTRL_TILE_FORMAT_SUPER_TILED (1 << 6)
#define IPU_PRE_PREFETCH_ENG_CTRL 0x080
#define IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN (1 << 0)
#define IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(v) ((v & 0x7) << 1)
#define IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(v) ((v & 0x3) << 4)
#define IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(v) ((v & 0x7) << 8)
#define IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS (1 << 11)
#define IPU_PRE_PREF_ENG_CTRL_FIELD_INVERSE (1 << 12)
#define IPU_PRE_PREF_ENG_CTRL_PARTIAL_UV_SWAP (1 << 14)
#define IPU_PRE_PREF_ENG_CTRL_TPR_COOR_OFFSET_EN (1 << 15)
#define IPU_PRE_PREFETCH_ENG_INPUT_SIZE 0x0a0
#define IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(v) ((v & 0xffff) << 0)
#define IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(v) ((v & 0xffff) << 16)
#define IPU_PRE_PREFETCH_ENG_PITCH 0x0d0
#define IPU_PRE_PREFETCH_ENG_PITCH_Y(v) ((v & 0xffff) << 0)
#define IPU_PRE_PREFETCH_ENG_PITCH_UV(v) ((v & 0xffff) << 16)
#define IPU_PRE_STORE_ENG_CTRL 0x110
#define IPU_PRE_STORE_ENG_CTRL_STORE_EN (1 << 0)
#define IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(v) ((v & 0x7) << 1)
#define IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(v) ((v & 0x3) << 4)
#define IPU_PRE_STORE_ENG_STATUS 0x120
#define IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_X_MASK 0xffff
#define IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_X_SHIFT 0
#define IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_MASK 0x3fff
#define IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_SHIFT 16
#define IPU_PRE_STORE_ENG_STATUS_STORE_FIFO_FULL (1 << 30)
#define IPU_PRE_STORE_ENG_STATUS_STORE_FIELD (1 << 31)
#define IPU_PRE_STORE_ENG_SIZE 0x130
#define IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(v) ((v & 0xffff) << 0)
#define IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(v) ((v & 0xffff) << 16)
#define IPU_PRE_STORE_ENG_PITCH 0x140
#define IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(v) ((v & 0xffff) << 0)
#define IPU_PRE_STORE_ENG_ADDR 0x150
struct ipu_pre {
struct list_head list;
struct device *dev;
void __iomem *regs;
struct clk *clk_axi;
struct gen_pool *iram;
dma_addr_t buffer_paddr;
void *buffer_virt;
bool in_use;
unsigned int safe_window_end;
unsigned int last_bufaddr;
};
static DEFINE_MUTEX(ipu_pre_list_mutex);
static LIST_HEAD(ipu_pre_list);
static int available_pres;
int ipu_pre_get_available_count(void)
{
return available_pres;
}
struct ipu_pre *
ipu_pre_lookup_by_phandle(struct device *dev, const char *name, int index)
{
struct device_node *pre_node = of_parse_phandle(dev->of_node,
name, index);
struct ipu_pre *pre;
mutex_lock(&ipu_pre_list_mutex);
list_for_each_entry(pre, &ipu_pre_list, list) {
if (pre_node == pre->dev->of_node) {
mutex_unlock(&ipu_pre_list_mutex);
device_link_add(dev, pre->dev,
DL_FLAG_AUTOREMOVE_CONSUMER);
of_node_put(pre_node);
return pre;
}
}
mutex_unlock(&ipu_pre_list_mutex);
of_node_put(pre_node);
return NULL;
}
int ipu_pre_get(struct ipu_pre *pre)
{
u32 val;
if (pre->in_use)
return -EBUSY;
/* first get the engine out of reset and remove clock gating */
writel(0, pre->regs + IPU_PRE_CTRL);
/* init defaults that should be applied to all streams */
val = IPU_PRE_CTRL_HANDSHAKE_ABORT_SKIP_EN |
IPU_PRE_CTRL_HANDSHAKE_EN |
IPU_PRE_CTRL_TPR_REST_SEL |
IPU_PRE_CTRL_SDW_UPDATE;
writel(val, pre->regs + IPU_PRE_CTRL);
pre->in_use = true;
return 0;
}
void ipu_pre_put(struct ipu_pre *pre)
{
writel(IPU_PRE_CTRL_SFTRST, pre->regs + IPU_PRE_CTRL);
pre->in_use = false;
}
void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
unsigned int height, unsigned int stride, u32 format,
uint64_t modifier, unsigned int bufaddr)
{
const struct drm_format_info *info = drm_format_info(format);
u32 active_bpp = info->cpp[0] >> 1;
u32 val;
/* calculate safe window for ctrl register updates */
if (modifier == DRM_FORMAT_MOD_LINEAR)
pre->safe_window_end = height - 2;
else
pre->safe_window_end = DIV_ROUND_UP(height, 4) - 1;
writel(bufaddr, pre->regs + IPU_PRE_CUR_BUF);
writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
pre->last_bufaddr = bufaddr;
val = IPU_PRE_PREF_ENG_CTRL_INPUT_PIXEL_FORMAT(0) |
IPU_PRE_PREF_ENG_CTRL_INPUT_ACTIVE_BPP(active_bpp) |
IPU_PRE_PREF_ENG_CTRL_RD_NUM_BYTES(4) |
IPU_PRE_PREF_ENG_CTRL_SHIFT_BYPASS |
IPU_PRE_PREF_ENG_CTRL_PREFETCH_EN;
writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_CTRL);
val = IPU_PRE_PREFETCH_ENG_INPUT_SIZE_WIDTH(width) |
IPU_PRE_PREFETCH_ENG_INPUT_SIZE_HEIGHT(height);
writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_INPUT_SIZE);
val = IPU_PRE_PREFETCH_ENG_PITCH_Y(stride);
writel(val, pre->regs + IPU_PRE_PREFETCH_ENG_PITCH);
val = IPU_PRE_STORE_ENG_CTRL_OUTPUT_ACTIVE_BPP(active_bpp) |
IPU_PRE_STORE_ENG_CTRL_WR_NUM_BYTES(4) |
IPU_PRE_STORE_ENG_CTRL_STORE_EN;
writel(val, pre->regs + IPU_PRE_STORE_ENG_CTRL);
val = IPU_PRE_STORE_ENG_SIZE_INPUT_WIDTH(width) |
IPU_PRE_STORE_ENG_SIZE_INPUT_HEIGHT(height);
writel(val, pre->regs + IPU_PRE_STORE_ENG_SIZE);
val = IPU_PRE_STORE_ENG_PITCH_OUT_PITCH(stride);
writel(val, pre->regs + IPU_PRE_STORE_ENG_PITCH);
writel(pre->buffer_paddr, pre->regs + IPU_PRE_STORE_ENG_ADDR);
val = readl(pre->regs + IPU_PRE_TPR_CTRL);
val &= ~IPU_PRE_TPR_CTRL_TILE_FORMAT_MASK;
if (modifier != DRM_FORMAT_MOD_LINEAR) {
/* only support single buffer formats for now */
val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_SINGLE_BUF;
if (modifier == DRM_FORMAT_MOD_VIVANTE_SUPER_TILED)
val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_SUPER_TILED;
if (info->cpp[0] == 2)
val |= IPU_PRE_TPR_CTRL_TILE_FORMAT_16_BIT;
}
writel(val, pre->regs + IPU_PRE_TPR_CTRL);
val = readl(pre->regs + IPU_PRE_CTRL);
val |= IPU_PRE_CTRL_EN_REPEAT | IPU_PRE_CTRL_ENABLE |
IPU_PRE_CTRL_SDW_UPDATE;
if (modifier == DRM_FORMAT_MOD_LINEAR)
val &= ~IPU_PRE_CTRL_BLOCK_EN;
else
val |= IPU_PRE_CTRL_BLOCK_EN;
writel(val, pre->regs + IPU_PRE_CTRL);
}
void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr)
{
unsigned long timeout = jiffies + msecs_to_jiffies(5);
unsigned short current_yblock;
u32 val;
if (bufaddr == pre->last_bufaddr)
return;
writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
pre->last_bufaddr = bufaddr;
do {
if (time_after(jiffies, timeout)) {
dev_warn(pre->dev, "timeout waiting for PRE safe window\n");
return;
}
val = readl(pre->regs + IPU_PRE_STORE_ENG_STATUS);
current_yblock =
(val >> IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_SHIFT) &
IPU_PRE_STORE_ENG_STATUS_STORE_BLOCK_Y_MASK;
} while (current_yblock == 0 || current_yblock >= pre->safe_window_end);
writel(IPU_PRE_CTRL_SDW_UPDATE, pre->regs + IPU_PRE_CTRL_SET);
}
bool ipu_pre_update_pending(struct ipu_pre *pre)
{
return !!(readl_relaxed(pre->regs + IPU_PRE_CTRL) &
IPU_PRE_CTRL_SDW_UPDATE);
}
u32 ipu_pre_get_baddr(struct ipu_pre *pre)
{
return (u32)pre->buffer_paddr;
}
static int ipu_pre_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *res;
struct ipu_pre *pre;
pre = devm_kzalloc(dev, sizeof(*pre), GFP_KERNEL);
if (!pre)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pre->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pre->regs))
return PTR_ERR(pre->regs);
pre->clk_axi = devm_clk_get(dev, "axi");
if (IS_ERR(pre->clk_axi))
return PTR_ERR(pre->clk_axi);
pre->iram = of_gen_pool_get(dev->of_node, "fsl,iram", 0);
if (!pre->iram)
return -EPROBE_DEFER;
/*
* Allocate IRAM buffer with maximum size. This could be made dynamic,
* but as there is no other user of this IRAM region and we can fit all
* max sized buffers into it, there is no need yet.
*/
pre->buffer_virt = gen_pool_dma_alloc(pre->iram, IPU_PRE_MAX_WIDTH *
IPU_PRE_NUM_SCANLINES * 4,
&pre->buffer_paddr);
if (!pre->buffer_virt)
return -ENOMEM;
clk_prepare_enable(pre->clk_axi);
pre->dev = dev;
platform_set_drvdata(pdev, pre);
mutex_lock(&ipu_pre_list_mutex);
list_add(&pre->list, &ipu_pre_list);
available_pres++;
mutex_unlock(&ipu_pre_list_mutex);
return 0;
}
static int ipu_pre_remove(struct platform_device *pdev)
{
struct ipu_pre *pre = platform_get_drvdata(pdev);
mutex_lock(&ipu_pre_list_mutex);
list_del(&pre->list);
available_pres--;
mutex_unlock(&ipu_pre_list_mutex);
clk_disable_unprepare(pre->clk_axi);
if (pre->buffer_virt)
gen_pool_free(pre->iram, (unsigned long)pre->buffer_virt,
IPU_PRE_MAX_WIDTH * IPU_PRE_NUM_SCANLINES * 4);
return 0;
}
static const struct of_device_id ipu_pre_dt_ids[] = {
{ .compatible = "fsl,imx6qp-pre", },
{ /* sentinel */ },
};
struct platform_driver ipu_pre_drv = {
.probe = ipu_pre_probe,
.remove = ipu_pre_remove,
.driver = {
.name = "imx-ipu-pre",
.of_match_table = ipu_pre_dt_ids,
},
};
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