diff options
Diffstat (limited to 'drivers/gpu/ipu-v3/ipu-pre.c')
| -rw-r--r-- | drivers/gpu/ipu-v3/ipu-pre.c | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/drivers/gpu/ipu-v3/ipu-pre.c b/drivers/gpu/ipu-v3/ipu-pre.c new file mode 100644 index 000000000000..c55563379e2e --- /dev/null +++ b/drivers/gpu/ipu-v3/ipu-pre.c @@ -0,0 +1,289 @@ +/* + * 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_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 *iram; + + 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_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); + 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; + + 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; + 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->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; + + 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->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, + }, +}; |