150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/*
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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/module.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(unsigned int irq, 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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for ( ; bisr; bisr &= bisr - 1)
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generic_handle_irq(bcsr_csc_base + __ffs(bisr));
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}
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/* NOTE: both the enable and mask bits must be cleared, otherwise the
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* CPLD generates tons of spurious interrupts (at least on my DB1200).
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* -- mlau
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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_INTCLR);
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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_INTCLR);
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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_INTSET);
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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 & disable & ack all */
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__raw_writew(0xffff, bcsr_virt + BCSR_REG_INTCLR);
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__raw_writew(0xffff, bcsr_virt + BCSR_REG_MASKCLR);
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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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