xref: /openbmc/linux/arch/arm/mach-imx/mach-imx51.c (revision 66ba9c05)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright 2011 Freescale Semiconductor, Inc. All Rights Reserved.
4  * Copyright 2011 Linaro Ltd.
5  */
6 
7 #include <linux/io.h>
8 #include <linux/of.h>
9 #include <linux/of_address.h>
10 #include <asm/mach/arch.h>
11 
12 #include "common.h"
13 #include "hardware.h"
14 
imx51_init_early(void)15 static void __init imx51_init_early(void)
16 {
17 	mxc_set_cpu_type(MXC_CPU_MX51);
18 }
19 
20 /*
21  * The MIPI HSC unit has been removed from the i.MX51 Reference Manual by
22  * the Freescale marketing division. However this did not remove the
23  * hardware from the chip which still needs to be configured for proper
24  * IPU support.
25  */
26 #define MX51_MIPI_HSC_BASE 0x83fdc000
imx51_ipu_mipi_setup(void)27 static void __init imx51_ipu_mipi_setup(void)
28 {
29 	void __iomem *hsc_addr;
30 
31 	hsc_addr = ioremap(MX51_MIPI_HSC_BASE, SZ_16K);
32 	WARN_ON(!hsc_addr);
33 
34 	/* setup MIPI module to legacy mode */
35 	imx_writel(0xf00, hsc_addr);
36 
37 	/* CSI mode: reserved; DI control mode: legacy (from Freescale BSP) */
38 	imx_writel(imx_readl(hsc_addr + 0x800) | 0x30ff, hsc_addr + 0x800);
39 
40 	iounmap(hsc_addr);
41 }
42 
imx51_m4if_setup(void)43 static void __init imx51_m4if_setup(void)
44 {
45 	void __iomem *m4if_base;
46 	struct device_node *np;
47 
48 	np = of_find_compatible_node(NULL, NULL, "fsl,imx51-m4if");
49 	if (!np)
50 		return;
51 
52 	m4if_base = of_iomap(np, 0);
53 	of_node_put(np);
54 	if (!m4if_base) {
55 		pr_err("Unable to map M4IF registers\n");
56 		return;
57 	}
58 
59 	/*
60 	 * Configure VPU and IPU with higher priorities
61 	 * in order to avoid artifacts during video playback
62 	 */
63 	writel_relaxed(0x00000203, m4if_base + 0x40);
64 	writel_relaxed(0x00000000, m4if_base + 0x44);
65 	writel_relaxed(0x00120125, m4if_base + 0x9c);
66 	writel_relaxed(0x001901A3, m4if_base + 0x48);
67 	iounmap(m4if_base);
68 }
69 
imx51_dt_init(void)70 static void __init imx51_dt_init(void)
71 {
72 	imx51_ipu_mipi_setup();
73 	imx_src_init();
74 	imx51_m4if_setup();
75 	imx5_pmu_init();
76 	imx_aips_allow_unprivileged_access("fsl,imx51-aipstz");
77 }
78 
imx51_init_late(void)79 static void __init imx51_init_late(void)
80 {
81 	mx51_neon_fixup();
82 	imx51_pm_init();
83 }
84 
85 static const char * const imx51_dt_board_compat[] __initconst = {
86 	"fsl,imx51",
87 	NULL
88 };
89 
90 DT_MACHINE_START(IMX51_DT, "Freescale i.MX51 (Device Tree Support)")
91 	.init_early	= imx51_init_early,
92 	.init_machine	= imx51_dt_init,
93 	.init_late	= imx51_init_late,
94 	.dt_compat	= imx51_dt_board_compat,
95 MACHINE_END
96