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