On Fri, 2017-02-17 at 19:28 +0100, Lucas Stach wrote:
> This adds support for the i.MX6 QuadPlus PRE units. Currently only
> linear prefetch into SRAM is supported, other modes of operation
> like the tiled-to-linear conversion will be added later.
>
> Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> ---
> drivers/gpu/ipu-v3/Makefile | 2 +-
> drivers/gpu/ipu-v3/ipu-pre.c | 290 +++++++++++++++++++++++++++++++++++++++++++
> drivers/gpu/ipu-v3/ipu-prv.h | 11 ++
> 3 files changed, 302 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/ipu-v3/ipu-pre.c
>
> diff --git a/drivers/gpu/ipu-v3/Makefile b/drivers/gpu/ipu-v3/Makefile
> index 5f961416c4ee..8ae90de46b4d 100644
> --- a/drivers/gpu/ipu-v3/Makefile
> +++ b/drivers/gpu/ipu-v3/Makefile
> @@ -2,4 +2,4 @@ obj-$(CONFIG_IMX_IPUV3_CORE) += imx-ipu-v3.o
>
> imx-ipu-v3-objs := ipu-common.o ipu-cpmem.o ipu-csi.o ipu-dc.o ipu-di.o \
> ipu-dp.o ipu-dmfc.o ipu-ic.o ipu-image-convert.o \
> - ipu-smfc.o ipu-vdi.o
> + ipu-pre.o ipu-smfc.o ipu-vdi.o
> diff --git a/drivers/gpu/ipu-v3/ipu-pre.c b/drivers/gpu/ipu-v3/ipu-pre.c
> new file mode 100644
> index 000000000000..febe0cb8b094
> --- /dev/null
> +++ b/drivers/gpu/ipu-v3/ipu-pre.c
> @@ -0,0 +1,290 @@
> +/*
> + * 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)
Single bit fields could use BIT(0) etc.
> +#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_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_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 *ocram;
> +
> + dma_addr_t buffer_paddr;
> + void *buffer_virt;
> + bool in_use;
> +};
> +
> +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_get_by_prg_device(struct device *dev, int index)
I'd call this ipu_pre_lookup_by_phandle and pass the device_node and
property name string parameter.
That way the name is better separated from ipu_pre_get ...
> +{
> + struct device_node *pre_node = of_parse_phandle(dev->of_node,
> + "fsl,pres", index);
... and the PRG specific "fsl,pres" string could move into the PRG
driver.
> + 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);
> + return pre;
> + }
> + }
> + mutex_unlock(&ipu_pre_list_mutex);
> +
> + return NULL;
> +}
> +
> +int ipu_pre_get(struct ipu_pre *pre)
> +{
> + u32 val;
> +
> + if (pre->in_use)
> + return -EBUSY;
This could race for in_use ...
> + clk_prepare_enable(pre->clk_axi);
> +
> + /* 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_BLOCK_16 | IPU_PRE_CTRL_SDW_UPDATE;
> + writel(val, pre->regs + IPU_PRE_CTRL);
> +
> + pre->in_use = true;
... until here.
> + return 0;
> +}
> +
> +void ipu_pre_put(struct ipu_pre *pre)
> +{
> + u32 val;
> +
> + val = IPU_PRE_CTRL_SFTRST | IPU_PRE_CTRL_CLKGATE;
> + writel(val, pre->regs + IPU_PRE_CTRL);
> +
> + clk_disable_unprepare(pre->clk_axi);
> +
> + pre->in_use = false;
> +}
> +
> +void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
> + unsigned int height, unsigned int stride, u32 format,
> + unsigned int bufaddr)
> +{
> + const struct drm_format_info *info = drm_format_info(format);
> + u32 active_bpp = info->cpp[0] >> 1;
> + u32 val;
> +
> + writel(bufaddr, pre->regs + IPU_PRE_CUR_BUF);
> + writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
> +
> + 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_CTRL);
> + val |= IPU_PRE_CTRL_EN_REPEAT | IPU_PRE_CTRL_ENABLE |
> + IPU_PRE_CTRL_SDW_UPDATE;
> + writel(val, pre->regs + IPU_PRE_CTRL);
> +}
> +
> +void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr)
> +{
> + writel(bufaddr, pre->regs + IPU_PRE_NEXT_BUF);
> + writel(IPU_PRE_CTRL_SDW_UPDATE, pre->regs + IPU_PRE_CTRL_SET);
> +}
> +
> +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->ocram = of_gen_pool_get(dev->of_node, "fsl,ocram", 0);
> + if (!pre->ocram)
> + return -EPROBE_DEFER;
I'd call this iram, from the point of view of the PRE.
> +
> + /*
> + * Allocate OCRAM buffer with maximum size. This could be made dynamic,
> + * but as there is no other user of this OCRAM region and we can fit all
> + * max sized buffers into it, there is no need yet.
> + */
> + pre->buffer_virt = gen_pool_dma_alloc(pre->ocram, IPU_PRE_MAX_WIDTH *
> + IPU_PRE_NUM_SCANLINES * 4,
> + &pre->buffer_paddr);
> + if (!pre->buffer_virt)
> + return -ENOMEM;
> +
> + 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);
> +
> + if (pre->buffer_virt)
> + gen_pool_free(pre->ocram, (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 */ },
> +};
> +
> +static 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,
> + },
> +};
> +module_platform_driver(ipu_pre_drv);
> diff --git a/drivers/gpu/ipu-v3/ipu-prv.h b/drivers/gpu/ipu-v3/ipu-prv.h
> index 22e47b68b14a..536a156a5eb6 100644
> --- a/drivers/gpu/ipu-v3/ipu-prv.h
> +++ b/drivers/gpu/ipu-v3/ipu-prv.h
> @@ -168,6 +168,7 @@ struct ipu_ic_priv;
> struct ipu_vdi;
> struct ipu_image_convert_priv;
> struct ipu_smfc_priv;
> +struct ipu_pre;
>
> struct ipu_devtype;
>
> @@ -259,4 +260,14 @@ void ipu_cpmem_exit(struct ipu_soc *ipu);
> int ipu_smfc_init(struct ipu_soc *ipu, struct device *dev, unsigned long base);
> void ipu_smfc_exit(struct ipu_soc *ipu);
>
> +struct ipu_pre *ipu_pre_get_by_prg_device(struct device *dev, int index);
> +int ipu_pre_get_available_count(void);
> +int ipu_pre_get(struct ipu_pre *pre);
> +void ipu_pre_put(struct ipu_pre *pre);
> +u32 ipu_pre_get_baddr(struct ipu_pre *pre);
> +void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
> + unsigned int height,
> + unsigned int stride, u32 format, unsigned int bufaddr);
> +void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr);
> +
> #endif /* __IPU_PRV_H__ */
regards
Philipp
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