arch/mips/pic32/pic32mzda/config.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Purna Chandra Mandal, purna.mandal@microchip.com
   4  * Copyright (C) 2015 Microchip Technology Inc.  All rights reserved.
   5  */
   6 #include <linux/init.h>
   7 #include <linux/io.h>
   8 #include <linux/of_platform.h>
   9
  10 #include <asm/mach-pic32/pic32.h>
  11
  12 #include "pic32mzda.h"
  13
  14 #define PIC32_CFGCON    0x0000
  15 #define PIC32_DEVID     0x0020
  16 #define PIC32_SYSKEY    0x0030
  17 #define PIC32_CFGEBIA   0x00c0
  18 #define PIC32_CFGEBIC   0x00d0
  19 #define PIC32_CFGCON2   0x00f0
  20 #define PIC32_RCON      0x1240
  21
  22 static void __iomem *pic32_conf_base;
  23 static DEFINE_SPINLOCK(config_lock);
  24 static u32 pic32_reset_status;
  25
  26 static u32 pic32_conf_get_reg_field(u32 offset, u32 rshift, u32 mask)
  27 {
  28         u32 v;
  29
  30         v = readl(pic32_conf_base + offset);
  31         v >>= rshift;
  32         v &= mask;
  33
  34         return v;
  35 }
  36
  37 static u32 pic32_conf_modify_atomic(u32 offset, u32 mask, u32 set)
  38 {
  39         u32 v;
  40         unsigned long flags;
  41
  42         spin_lock_irqsave(&config_lock, flags);
  43         v = readl(pic32_conf_base + offset);
  44         v &= ~mask;
  45         v |= (set & mask);
  46         writel(v, pic32_conf_base + offset);
  47         spin_unlock_irqrestore(&config_lock, flags);
  48
  49         return 0;
  50 }
  51
  52 int pic32_enable_lcd(void)
  53 {
  54         return pic32_conf_modify_atomic(PIC32_CFGCON2, BIT(31), BIT(31));
  55 }
  56
  57 int pic32_disable_lcd(void)
  58 {
  59         return pic32_conf_modify_atomic(PIC32_CFGCON2, BIT(31), 0);
  60 }
  61
  62 int pic32_set_lcd_mode(int mode)
  63 {
  64         u32 mask = mode ? BIT(30) : 0;
  65
  66         return pic32_conf_modify_atomic(PIC32_CFGCON2, BIT(30), mask);
  67 }
  68
  69 int pic32_set_sdhci_adma_fifo_threshold(u32 rthrsh, u32 wthrsh)
  70 {
  71         u32 clr, set;
  72
  73         clr = (0x3ff << 4) | (0x3ff << 16);
  74         set = (rthrsh << 4) | (wthrsh << 16);
  75         return pic32_conf_modify_atomic(PIC32_CFGCON2, clr, set);
  76 }
  77
  78 void pic32_syskey_unlock_debug(const char *func, const ulong line)
  79 {
  80         void __iomem *syskey = pic32_conf_base + PIC32_SYSKEY;
  81
  82         pr_debug("%s: called from %s:%lu\n", __func__, func, line);
  83         writel(0x00000000, syskey);
  84         writel(0xAA996655, syskey);
  85         writel(0x556699AA, syskey);
  86 }
  87
  88 static u32 pic32_get_device_id(void)
  89 {
  90         return pic32_conf_get_reg_field(PIC32_DEVID, 0, 0x0fffffff);
  91 }
  92
  93 static u32 pic32_get_device_version(void)
  94 {
  95         return pic32_conf_get_reg_field(PIC32_DEVID, 28, 0xf);
  96 }
  97
  98 u32 pic32_get_boot_status(void)
  99 {
 100         return pic32_reset_status;
 101 }
 102 EXPORT_SYMBOL(pic32_get_boot_status);
 103
 104 void __init pic32_config_init(void)
 105 {
 106         pic32_conf_base = ioremap(PIC32_BASE_CONFIG, 0x110);
 107         if (!pic32_conf_base)
 108                 panic("pic32: config base not mapped");
 109
 110         /* Boot Status */
 111         pic32_reset_status = readl(pic32_conf_base + PIC32_RCON);
 112         writel(-1, PIC32_CLR(pic32_conf_base + PIC32_RCON));
 113
 114         /* Device Inforation */
 115         pr_info("Device Id: 0x%08x, Device Ver: 0x%04x\n",
 116                 pic32_get_device_id(),
 117                 pic32_get_device_version());
 118 }