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147 lines
3.6 KiB
147 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* bcsr.h -- Db1xxx/Pb1xxx Devboard CPLD registers ("BCSR") abstraction. |
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* |
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* All Alchemy development boards (except, of course, the weird PB1000) |
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* have a few registers in a CPLD with standardised layout; they mostly |
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* only differ in base address. |
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* All registers are 16bits wide with 32bit spacing. |
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*/ |
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#include <linux/interrupt.h> |
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#include <linux/irqchip/chained_irq.h> |
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#include <linux/init.h> |
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#include <linux/export.h> |
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#include <linux/spinlock.h> |
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#include <linux/irq.h> |
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#include <asm/addrspace.h> |
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#include <asm/io.h> |
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#include <asm/mach-db1x00/bcsr.h> |
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static struct bcsr_reg { |
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void __iomem *raddr; |
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spinlock_t lock; |
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} bcsr_regs[BCSR_CNT]; |
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static void __iomem *bcsr_virt; /* KSEG1 addr of BCSR base */ |
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static int bcsr_csc_base; /* linux-irq of first cascaded irq */ |
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void __init bcsr_init(unsigned long bcsr1_phys, unsigned long bcsr2_phys) |
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{ |
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int i; |
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bcsr1_phys = KSEG1ADDR(CPHYSADDR(bcsr1_phys)); |
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bcsr2_phys = KSEG1ADDR(CPHYSADDR(bcsr2_phys)); |
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bcsr_virt = (void __iomem *)bcsr1_phys; |
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for (i = 0; i < BCSR_CNT; i++) { |
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if (i >= BCSR_HEXLEDS) |
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bcsr_regs[i].raddr = (void __iomem *)bcsr2_phys + |
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(0x04 * (i - BCSR_HEXLEDS)); |
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else |
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bcsr_regs[i].raddr = (void __iomem *)bcsr1_phys + |
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(0x04 * i); |
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spin_lock_init(&bcsr_regs[i].lock); |
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} |
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} |
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unsigned short bcsr_read(enum bcsr_id reg) |
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{ |
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unsigned short r; |
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unsigned long flags; |
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spin_lock_irqsave(&bcsr_regs[reg].lock, flags); |
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r = __raw_readw(bcsr_regs[reg].raddr); |
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spin_unlock_irqrestore(&bcsr_regs[reg].lock, flags); |
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return r; |
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} |
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EXPORT_SYMBOL_GPL(bcsr_read); |
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void bcsr_write(enum bcsr_id reg, unsigned short val) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&bcsr_regs[reg].lock, flags); |
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__raw_writew(val, bcsr_regs[reg].raddr); |
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wmb(); |
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spin_unlock_irqrestore(&bcsr_regs[reg].lock, flags); |
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} |
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EXPORT_SYMBOL_GPL(bcsr_write); |
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void bcsr_mod(enum bcsr_id reg, unsigned short clr, unsigned short set) |
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{ |
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unsigned short r; |
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unsigned long flags; |
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spin_lock_irqsave(&bcsr_regs[reg].lock, flags); |
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r = __raw_readw(bcsr_regs[reg].raddr); |
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r &= ~clr; |
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r |= set; |
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__raw_writew(r, bcsr_regs[reg].raddr); |
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wmb(); |
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spin_unlock_irqrestore(&bcsr_regs[reg].lock, flags); |
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} |
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EXPORT_SYMBOL_GPL(bcsr_mod); |
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/* |
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* DB1200/PB1200 CPLD IRQ muxer |
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*/ |
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static void bcsr_csc_handler(struct irq_desc *d) |
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{ |
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unsigned short bisr = __raw_readw(bcsr_virt + BCSR_REG_INTSTAT); |
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struct irq_chip *chip = irq_desc_get_chip(d); |
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chained_irq_enter(chip, d); |
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generic_handle_irq(bcsr_csc_base + __ffs(bisr)); |
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chained_irq_exit(chip, d); |
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} |
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static void bcsr_irq_mask(struct irq_data *d) |
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{ |
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unsigned short v = 1 << (d->irq - bcsr_csc_base); |
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__raw_writew(v, bcsr_virt + BCSR_REG_MASKCLR); |
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wmb(); |
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} |
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static void bcsr_irq_maskack(struct irq_data *d) |
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{ |
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unsigned short v = 1 << (d->irq - bcsr_csc_base); |
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__raw_writew(v, bcsr_virt + BCSR_REG_MASKCLR); |
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__raw_writew(v, bcsr_virt + BCSR_REG_INTSTAT); /* ack */ |
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wmb(); |
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} |
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static void bcsr_irq_unmask(struct irq_data *d) |
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{ |
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unsigned short v = 1 << (d->irq - bcsr_csc_base); |
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__raw_writew(v, bcsr_virt + BCSR_REG_MASKSET); |
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wmb(); |
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} |
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static struct irq_chip bcsr_irq_type = { |
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.name = "CPLD", |
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.irq_mask = bcsr_irq_mask, |
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.irq_mask_ack = bcsr_irq_maskack, |
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.irq_unmask = bcsr_irq_unmask, |
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}; |
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void __init bcsr_init_irq(int csc_start, int csc_end, int hook_irq) |
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{ |
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unsigned int irq; |
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/* mask & enable & ack all */ |
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__raw_writew(0xffff, bcsr_virt + BCSR_REG_MASKCLR); |
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__raw_writew(0xffff, bcsr_virt + BCSR_REG_INTSET); |
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__raw_writew(0xffff, bcsr_virt + BCSR_REG_INTSTAT); |
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wmb(); |
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bcsr_csc_base = csc_start; |
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for (irq = csc_start; irq <= csc_end; irq++) |
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irq_set_chip_and_handler_name(irq, &bcsr_irq_type, |
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handle_level_irq, "level"); |
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irq_set_chained_handler(hook_irq, bcsr_csc_handler); |
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}
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