arch/arm/mach-imx/mach-imx51.c

   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
  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
  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
  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
  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
  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