Release 4.14 arch/mips/pic32/pic32mzda/config.c
/*
* Purna Chandra Mandal, purna.mandal@microchip.com
* Copyright (C) 2015 Microchip Technology Inc. All rights reserved.
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of_platform.h>
#include <asm/mach-pic32/pic32.h>
#include "pic32mzda.h"
#define PIC32_CFGCON 0x0000
#define PIC32_DEVID 0x0020
#define PIC32_SYSKEY 0x0030
#define PIC32_CFGEBIA 0x00c0
#define PIC32_CFGEBIC 0x00d0
#define PIC32_CFGCON2 0x00f0
#define PIC32_RCON 0x1240
static void __iomem *pic32_conf_base;
static DEFINE_SPINLOCK(config_lock);
static u32 pic32_reset_status;
static u32 pic32_conf_get_reg_field(u32 offset, u32 rshift, u32 mask)
{
u32 v;
v = readl(pic32_conf_base + offset);
v >>= rshift;
v &= mask;
return v;
}
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static u32 pic32_conf_modify_atomic(u32 offset, u32 mask, u32 set)
{
u32 v;
unsigned long flags;
spin_lock_irqsave(&config_lock, flags);
v = readl(pic32_conf_base + offset);
v &= ~mask;
v |= (set & mask);
writel(v, pic32_conf_base + offset);
spin_unlock_irqrestore(&config_lock, flags);
return 0;
}
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int pic32_enable_lcd(void)
{
return pic32_conf_modify_atomic(PIC32_CFGCON2, BIT(31), BIT(31));
}
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int pic32_disable_lcd(void)
{
return pic32_conf_modify_atomic(PIC32_CFGCON2, BIT(31), 0);
}
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int pic32_set_lcd_mode(int mode)
{
u32 mask = mode ? BIT(30) : 0;
return pic32_conf_modify_atomic(PIC32_CFGCON2, BIT(30), mask);
}
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int pic32_set_sdhci_adma_fifo_threshold(u32 rthrsh, u32 wthrsh)
{
u32 clr, set;
clr = (0x3ff << 4) | (0x3ff << 16);
set = (rthrsh << 4) | (wthrsh << 16);
return pic32_conf_modify_atomic(PIC32_CFGCON2, clr, set);
}
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void pic32_syskey_unlock_debug(const char *func, const ulong line)
{
void __iomem *syskey = pic32_conf_base + PIC32_SYSKEY;
pr_debug("%s: called from %s:%lu\n", __func__, func, line);
writel(0x00000000, syskey);
writel(0xAA996655, syskey);
writel(0x556699AA, syskey);
}
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static u32 pic32_get_device_id(void)
{
return pic32_conf_get_reg_field(PIC32_DEVID, 0, 0x0fffffff);
}
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static u32 pic32_get_device_version(void)
{
return pic32_conf_get_reg_field(PIC32_DEVID, 28, 0xf);
}
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u32 pic32_get_boot_status(void)
{
return pic32_reset_status;
}
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EXPORT_SYMBOL(pic32_get_boot_status);
void __init pic32_config_init(void)
{
pic32_conf_base = ioremap(PIC32_BASE_CONFIG, 0x110);
if (!pic32_conf_base)
panic("pic32: config base not mapped");
/* Boot Status */
pic32_reset_status = readl(pic32_conf_base + PIC32_RCON);
writel(-1, PIC32_CLR(pic32_conf_base + PIC32_RCON));
/* Device Inforation */
pr_info("Device Id: 0x%08x, Device Ver: 0x%04x\n",
pic32_get_device_id(),
pic32_get_device_version());
}
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