diff options
Diffstat (limited to 'kernel/arch/mips/vr41xx/common/cmu.c')
| -rw-r--r-- | kernel/arch/mips/vr41xx/common/cmu.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/kernel/arch/mips/vr41xx/common/cmu.c b/kernel/arch/mips/vr41xx/common/cmu.c new file mode 100644 index 000000000..05302bfdd --- /dev/null +++ b/kernel/arch/mips/vr41xx/common/cmu.c @@ -0,0 +1,257 @@ +/* + * cmu.c, Clock Mask Unit routines for the NEC VR4100 series. + * + * Copyright (C) 2001-2002 MontaVista Software Inc. + * Author: Yoichi Yuasa <source@mvista.com> + * Copuright (C) 2003-2005 Yoichi Yuasa <yuasa@linux-mips.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +/* + * 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/init.h> +#include <linux/ioport.h> +#include <linux/module.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); |