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