1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright 2019 NXP.
4 */
5
6#include <linux/device.h>
7#include <linux/of.h>
8#include <linux/slab.h>
9
10#include "dcss-dev.h"
11
12#define DCSS_BLKCTL_RESET_CTRL 0x00
13#define B_CLK_RESETN BIT(0)
14#define APB_CLK_RESETN BIT(1)
15#define P_CLK_RESETN BIT(2)
16#define RTR_CLK_RESETN BIT(4)
17#define DCSS_BLKCTL_CONTROL0 0x10
18#define HDMI_MIPI_CLK_SEL BIT(0)
19#define DISPMIX_REFCLK_SEL_POS 4
20#define DISPMIX_REFCLK_SEL_MASK GENMASK(5, 4)
21#define DISPMIX_PIXCLK_SEL BIT(8)
22#define HDMI_SRC_SECURE_EN BIT(16)
23
24struct dcss_blkctl {
25 struct dcss_dev *dcss;
26 void __iomem *base_reg;
27};
28
29void dcss_blkctl_cfg(struct dcss_blkctl *blkctl)
30{
31 if (blkctl->dcss->hdmi_output)
32 dcss_writel(0, blkctl->base_reg + DCSS_BLKCTL_CONTROL0);
33 else
34 dcss_writel(DISPMIX_PIXCLK_SEL,
35 blkctl->base_reg + DCSS_BLKCTL_CONTROL0);
36
37 dcss_set(B_CLK_RESETN | APB_CLK_RESETN | P_CLK_RESETN | RTR_CLK_RESETN,
38 blkctl->base_reg + DCSS_BLKCTL_RESET_CTRL);
39}
40
41int dcss_blkctl_init(struct dcss_dev *dcss, unsigned long blkctl_base)
42{
43 struct dcss_blkctl *blkctl;
44
45 blkctl = devm_kzalloc(dev: dcss->dev, size: sizeof(*blkctl), GFP_KERNEL);
46 if (!blkctl)
47 return -ENOMEM;
48
49 blkctl->base_reg = devm_ioremap(dev: dcss->dev, offset: blkctl_base, SZ_4K);
50 if (!blkctl->base_reg) {
51 dev_err(dcss->dev, "unable to remap BLK CTRL base\n");
52 return -ENOMEM;
53 }
54
55 dcss->blkctl = blkctl;
56 blkctl->dcss = dcss;
57
58 dcss_blkctl_cfg(blkctl);
59
60 return 0;
61}
62

source code of linux/drivers/gpu/drm/imx/dcss/dcss-blkctl.c