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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm/mach-imx/mach-imx51.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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 * Copyright 2011 Freescale Semiconductor, Inc. All Rights Reserved.

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 * Copyright 2011 Linaro Ltd.

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 */

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#include <linux/io.h>

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#include <linux/of.h>

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#include <linux/of_address.h>

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#include <asm/mach/arch.h>

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#include "common.h"

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#include "hardware.h"

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static void __init imx51_init_early(void)

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{

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	mxc_set_cpu_type(MXC_CPU_MX51);

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}

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/*

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 * The MIPI HSC unit has been removed from the i.MX51 Reference Manual by

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 * the Freescale marketing division. However this did not remove the

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 * hardware from the chip which still needs to be configured for proper

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 * IPU support.

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 */

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#define MX51_MIPI_HSC_BASE 0x83fdc000

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static void __init imx51_ipu_mipi_setup(void)

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{

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	void __iomem *hsc_addr;

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	hsc_addr = ioremap(MX51_MIPI_HSC_BASE, SZ_16K);

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	WARN_ON(!hsc_addr);

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	/* setup MIPI module to legacy mode */

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	imx_writel(0xf00, hsc_addr);

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	/* CSI mode: reserved; DI control mode: legacy (from Freescale BSP) */

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	imx_writel(imx_readl(hsc_addr + 0x800) | 0x30ff, hsc_addr + 0x800);

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	iounmap(hsc_addr);

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}

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static void __init imx51_m4if_setup(void)

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{

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	void __iomem *m4if_base;

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	struct device_node *np;

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	np = of_find_compatible_node(NULL, NULL, "fsl,imx51-m4if");

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	if (!np)

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		return;

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	m4if_base = of_iomap(np, 0);

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	of_node_put(np);

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	if (!m4if_base) {

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		pr_err("Unable to map M4IF registers\n");

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		return;

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	}

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	/*

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	 * Configure VPU and IPU with higher priorities

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	 * in order to avoid artifacts during video playback

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	 */

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	writel_relaxed(0x00000203, m4if_base + 0x40);

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	writel_relaxed(0x00000000, m4if_base + 0x44);

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	writel_relaxed(0x00120125, m4if_base + 0x9c);

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	writel_relaxed(0x001901A3, m4if_base + 0x48);

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	iounmap(m4if_base);

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}

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static void __init imx51_dt_init(void)

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{

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	imx51_ipu_mipi_setup();

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	imx_src_init();

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	imx51_m4if_setup();

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	imx5_pmu_init();

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	imx_aips_allow_unprivileged_access("fsl,imx51-aipstz");

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}

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static void __init imx51_init_late(void)

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{

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	mx51_neon_fixup();

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	imx51_pm_init();

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}

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static const char * const imx51_dt_board_compat[] __initconst = {

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	"fsl,imx51",

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	NULL

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};

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DT_MACHINE_START(IMX51_DT, "Freescale i.MX51 (Device Tree Support)")

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	.init_early	= imx51_init_early,

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	.init_machine	= imx51_dt_init,

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	.init_late	= imx51_init_late,

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	.dt_compat	= imx51_dt_board_compat,

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MACHINE_END

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