77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
|
/*
|
||
|
|
* bcsr.h -- Db1xxx/Pb1xxx Devboard CPLD registers ("BCSR") abstraction.
|
||
|
|
*
|
||
|
|
* All Alchemy development boards (except, of course, the weird PB1000)
|
||
|
|
* have a few registers in a CPLD with standardised layout; they mostly
|
||
|
|
* only differ in base address.
|
||
|
|
* All registers are 16bits wide with 32bit spacing.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
#include <asm/addrspace.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <asm/mach-db1x00/bcsr.h>
|
||
|
|
|
||
|
|
static struct bcsr_reg {
|
||
|
|
void __iomem *raddr;
|
||
|
|
spinlock_t lock;
|
||
|
|
} bcsr_regs[BCSR_CNT];
|
||
|
|
|
||
|
|
void __init bcsr_init(unsigned long bcsr1_phys, unsigned long bcsr2_phys)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
bcsr1_phys = KSEG1ADDR(CPHYSADDR(bcsr1_phys));
|
||
|
|
bcsr2_phys = KSEG1ADDR(CPHYSADDR(bcsr2_phys));
|
||
|
|
|
||
|
|
for (i = 0; i < BCSR_CNT; i++) {
|
||
|
|
if (i >= BCSR_HEXLEDS)
|
||
|
|
bcsr_regs[i].raddr = (void __iomem *)bcsr2_phys +
|
||
|
|
(0x04 * (i - BCSR_HEXLEDS));
|
||
|
|
else
|
||
|
|
bcsr_regs[i].raddr = (void __iomem *)bcsr1_phys +
|
||
|
|
(0x04 * i);
|
||
|
|
|
||
|
|
spin_lock_init(&bcsr_regs[i].lock);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned short bcsr_read(enum bcsr_id reg)
|
||
|
|
{
|
||
|
|
unsigned short r;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&bcsr_regs[reg].lock, flags);
|
||
|
|
r = __raw_readw(bcsr_regs[reg].raddr);
|
||
|
|
spin_unlock_irqrestore(&bcsr_regs[reg].lock, flags);
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(bcsr_read);
|
||
|
|
|
||
|
|
void bcsr_write(enum bcsr_id reg, unsigned short val)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&bcsr_regs[reg].lock, flags);
|
||
|
|
__raw_writew(val, bcsr_regs[reg].raddr);
|
||
|
|
wmb();
|
||
|
|
spin_unlock_irqrestore(&bcsr_regs[reg].lock, flags);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(bcsr_write);
|
||
|
|
|
||
|
|
void bcsr_mod(enum bcsr_id reg, unsigned short clr, unsigned short set)
|
||
|
|
{
|
||
|
|
unsigned short r;
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
spin_lock_irqsave(&bcsr_regs[reg].lock, flags);
|
||
|
|
r = __raw_readw(bcsr_regs[reg].raddr);
|
||
|
|
r &= ~clr;
|
||
|
|
r |= set;
|
||
|
|
__raw_writew(r, bcsr_regs[reg].raddr);
|
||
|
|
wmb();
|
||
|
|
spin_unlock_irqrestore(&bcsr_regs[reg].lock, flags);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(bcsr_mod);
|