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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* cmu.c, Clock Mask Unit routines for the NEC VR4100 series.
*
* Copyright (C) 2001-2002 MontaVista Software Inc.
* Author: Yoichi Yuasa <source@mvista.com>
* Copyright (C) 2003-2005 Yoichi Yuasa <yuasa@linux-mips.org>
*/
/*
* Changes:
* MontaVista Software Inc. <source@mvista.com>
* - New creation, NEC VR4122 and VR4131 are supported.
* - Added support for NEC VR4111 and VR4121.
*
* Yoichi Yuasa <yuasa@linux-mips.org>
* - Added support for NEC VR4133.
*/
#include <linux/export.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <asm/cpu.h>
#include <asm/io.h>
#include <asm/vr41xx/vr41xx.h>
#define CMU_TYPE1_BASE 0x0b000060UL
#define CMU_TYPE1_SIZE 0x4
#define CMU_TYPE2_BASE 0x0f000060UL
#define CMU_TYPE2_SIZE 0x4
#define CMU_TYPE3_BASE 0x0f000060UL
#define CMU_TYPE3_SIZE 0x8
#define CMUCLKMSK 0x0
#define MSKPIU 0x0001
#define MSKSIU 0x0002
#define MSKAIU 0x0004
#define MSKKIU 0x0008
#define MSKFIR 0x0010
#define MSKDSIU 0x0820
#define MSKCSI 0x0040
#define MSKPCIU 0x0080
#define MSKSSIU 0x0100
#define MSKSHSP 0x0200
#define MSKFFIR 0x0400
#define MSKSCSI 0x1000
#define MSKPPCIU 0x2000
#define CMUCLKMSK2 0x4
#define MSKCEU 0x0001
#define MSKMAC0 0x0002
#define MSKMAC1 0x0004
static void __iomem *cmu_base;
static uint16_t cmuclkmsk, cmuclkmsk2;
static DEFINE_SPINLOCK(cmu_lock);
#define cmu_read(offset) readw(cmu_base + (offset))
#define cmu_write(offset, value) writew((value), cmu_base + (offset))
void vr41xx_supply_clock(vr41xx_clock_t clock)
{
spin_lock_irq(&cmu_lock);
switch (clock) {
case PIU_CLOCK:
cmuclkmsk |= MSKPIU;
break;
case SIU_CLOCK:
cmuclkmsk |= MSKSIU | MSKSSIU;
break;
case AIU_CLOCK:
cmuclkmsk |= MSKAIU;
break;
case KIU_CLOCK:
cmuclkmsk |= MSKKIU;
break;
case FIR_CLOCK:
cmuclkmsk |= MSKFIR | MSKFFIR;
break;
case DSIU_CLOCK:
if (current_cpu_type() == CPU_VR4111 ||
current_cpu_type() == CPU_VR4121)
cmuclkmsk |= MSKDSIU;
else
cmuclkmsk |= MSKSIU | MSKDSIU;
break;
case CSI_CLOCK:
cmuclkmsk |= MSKCSI | MSKSCSI;
break;
case PCIU_CLOCK:
cmuclkmsk |= MSKPCIU;
break;
case HSP_CLOCK:
cmuclkmsk |= MSKSHSP;
break;
case PCI_CLOCK:
cmuclkmsk |= MSKPPCIU;
break;
case CEU_CLOCK:
cmuclkmsk2 |= MSKCEU;
break;
case ETHER0_CLOCK:
cmuclkmsk2 |= MSKMAC0;
break;
case ETHER1_CLOCK:
cmuclkmsk2 |= MSKMAC1;
break;
default:
break;
}
if (clock == CEU_CLOCK || clock == ETHER0_CLOCK ||
clock == ETHER1_CLOCK)
cmu_write(CMUCLKMSK2, cmuclkmsk2);
else
cmu_write(CMUCLKMSK, cmuclkmsk);
spin_unlock_irq(&cmu_lock);
}
EXPORT_SYMBOL_GPL(vr41xx_supply_clock);
void vr41xx_mask_clock(vr41xx_clock_t clock)
{
spin_lock_irq(&cmu_lock);
switch (clock) {
case PIU_CLOCK:
cmuclkmsk &= ~MSKPIU;
break;
case SIU_CLOCK:
if (current_cpu_type() == CPU_VR4111 ||
current_cpu_type() == CPU_VR4121) {
cmuclkmsk &= ~(MSKSIU | MSKSSIU);
} else {
if (cmuclkmsk & MSKDSIU)
cmuclkmsk &= ~MSKSSIU;
else
cmuclkmsk &= ~(MSKSIU | MSKSSIU);
}
break;
case AIU_CLOCK:
cmuclkmsk &= ~MSKAIU;
break;
case KIU_CLOCK:
cmuclkmsk &= ~MSKKIU;
break;
case FIR_CLOCK:
cmuclkmsk &= ~(MSKFIR | MSKFFIR);
break;
case DSIU_CLOCK:
if (current_cpu_type() == CPU_VR4111 ||
current_cpu_type() == CPU_VR4121) {
cmuclkmsk &= ~MSKDSIU;
} else {
if (cmuclkmsk & MSKSSIU)
cmuclkmsk &= ~MSKDSIU;
else
cmuclkmsk &= ~(MSKSIU | MSKDSIU);
}
break;
case CSI_CLOCK:
cmuclkmsk &= ~(MSKCSI | MSKSCSI);
break;
case PCIU_CLOCK:
cmuclkmsk &= ~MSKPCIU;
break;
case HSP_CLOCK:
cmuclkmsk &= ~MSKSHSP;
break;
case PCI_CLOCK:
cmuclkmsk &= ~MSKPPCIU;
break;
case CEU_CLOCK:
cmuclkmsk2 &= ~MSKCEU;
break;
case ETHER0_CLOCK:
cmuclkmsk2 &= ~MSKMAC0;
break;
case ETHER1_CLOCK:
cmuclkmsk2 &= ~MSKMAC1;
break;
default:
break;
}
if (clock == CEU_CLOCK || clock == ETHER0_CLOCK ||
clock == ETHER1_CLOCK)
cmu_write(CMUCLKMSK2, cmuclkmsk2);
else
cmu_write(CMUCLKMSK, cmuclkmsk);
spin_unlock_irq(&cmu_lock);
}
EXPORT_SYMBOL_GPL(vr41xx_mask_clock);
static int __init vr41xx_cmu_init(void)
{
unsigned long start, size;
switch (current_cpu_type()) {
case CPU_VR4111:
case CPU_VR4121:
start = CMU_TYPE1_BASE;
size = CMU_TYPE1_SIZE;
break;
case CPU_VR4122:
case CPU_VR4131:
start = CMU_TYPE2_BASE;
size = CMU_TYPE2_SIZE;
break;
case CPU_VR4133:
start = CMU_TYPE3_BASE;
size = CMU_TYPE3_SIZE;
break;
default:
panic("Unexpected CPU of NEC VR4100 series");
break;
}
if (request_mem_region(start, size, "CMU") == NULL)
return -EBUSY;
cmu_base = ioremap(start, size);
if (cmu_base == NULL) {
release_mem_region(start, size);
return -EBUSY;
}
cmuclkmsk = cmu_read(CMUCLKMSK);
if (current_cpu_type() == CPU_VR4133)
cmuclkmsk2 = cmu_read(CMUCLKMSK2);
spin_lock_init(&cmu_lock);
return 0;
}
core_initcall(vr41xx_cmu_init);
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