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>
---
v2:
- adopt to changed DT binding
- change name of the lookup functions as suggested by Philipp
---
drivers/gpu/ipu-v3/Makefile | 2 +-
drivers/gpu/ipu-v3/ipu-pre.c | 290 +++++++++++++++++++++++++++++++++++++++++++
drivers/gpu/ipu-v3/ipu-prv.h | 12 ++
3 files changed, 303 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..d31e620b7827
--- /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)
+#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 */ },
+};
+
+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 285595702ee0..766369a8c647 100644
--- a/drivers/gpu/ipu-v3/ipu-prv.h
+++ b/drivers/gpu/ipu-v3/ipu-prv.h
@@ -173,6 +173,7 @@ struct ipu_ic_priv;
struct ipu_vdi;
struct ipu_image_convert_priv;
struct ipu_smfc_priv;
+struct ipu_pre;
struct ipu_devtype;
@@ -264,4 +265,15 @@ 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_lookup_by_phandle(struct device *dev, const char *name,
+ 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__ */
--
2.11.0
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