#ifndef __ALPHA_LCA__H__
#define __ALPHA_LCA__H__

#include <linux/config.h>
#include <asm/system.h>
#include <asm/compiler.h>

/*
 * Low Cost Alpha (LCA) definitions (these apply to 21066 and 21068,
 * for example).
 *
 * This file is based on:
 *
 *	DECchip 21066 and DECchip 21068 Alpha AXP Microprocessors
 *	Hardware Reference Manual; Digital Equipment Corp.; May 1994;
 *	Maynard, MA; Order Number: EC-N2681-71.
 */

/*
 * NOTE: The LCA uses a Host Address Extension (HAE) register to access
 *	 PCI addresses that are beyond the first 27 bits of address
 *	 space.  Updating the HAE requires an external cycle (and
 *	 a memory barrier), which tends to be slow.  Instead of updating
 *	 it on each sparse memory access, we keep the current HAE value
 *	 cached in variable cache_hae.  Only if the cached HAE differs
 *	 from the desired HAE value do we actually updated HAE register.
 *	 The HAE register is preserved by the interrupt handler entry/exit
 *	 code, so this scheme works even in the presence of interrupts.
 *
 * Dense memory space doesn't require the HAE, but is restricted to
 * aligned 32 and 64 bit accesses.  Special Cycle and Interrupt
 * Acknowledge cycles may also require the use of the HAE.  The LCA
 * limits I/O address space to the bottom 24 bits of address space,
 * but this easily covers the 16 bit ISA I/O address space.
 */

/*
 * NOTE 2! The memory operations do not set any memory barriers, as
 * it's not needed for cases like a frame buffer that is essentially
 * memory-like.  You need to do them by hand if the operations depend
 * on ordering.
 *
 * Similarly, the port I/O operations do a "mb" only after a write
 * operation: if an mb is needed before (as in the case of doing
 * memory mapped I/O first, and then a port I/O operation to the same
 * device), it needs to be done by hand.
 *
 * After the above has bitten me 100 times, I'll give up and just do
 * the mb all the time, but right now I'm hoping this will work out.
 * Avoiding mb's may potentially be a noticeable speed improvement,
 * but I can't honestly say I've tested it.
 *
 * Handling interrupts that need to do mb's to synchronize to
 * non-interrupts is another fun race area.  Don't do it (because if
 * you do, I'll have to do *everything* with interrupts disabled,
 * ugh).
 */

#define LCA_DMA_WIN_BASE_DEFAULT	(1024*1024*1024)
#define LCA_DMA_WIN_SIZE_DEFAULT	(1024*1024*1024)

#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_SRM_SETUP)
#define LCA_DMA_WIN_BASE		alpha_mv.dma_win_base
#define LCA_DMA_WIN_SIZE		alpha_mv.dma_win_size
#else
#define LCA_DMA_WIN_BASE		LCA_DMA_WIN_BASE_DEFAULT
#define LCA_DMA_WIN_SIZE		LCA_DMA_WIN_SIZE_DEFAULT
#endif

/*
 * Memory Controller registers:
 */
#define LCA_MEM_BCR0		(IDENT_ADDR + 0x120000000UL)
#define LCA_MEM_BCR1		(IDENT_ADDR + 0x120000008UL)
#define LCA_MEM_BCR2		(IDENT_ADDR + 0x120000010UL)
#define LCA_MEM_BCR3		(IDENT_ADDR + 0x120000018UL)
#define LCA_MEM_BMR0		(IDENT_ADDR + 0x120000020UL)
#define LCA_MEM_BMR1		(IDENT_ADDR + 0x120000028UL)
#define LCA_MEM_BMR2		(IDENT_ADDR + 0x120000030UL)
#define LCA_MEM_BMR3		(IDENT_ADDR + 0x120000038UL)
#define LCA_MEM_BTR0		(IDENT_ADDR + 0x120000040UL)
#define LCA_MEM_BTR1		(IDENT_ADDR + 0x120000048UL)
#define LCA_MEM_BTR2		(IDENT_ADDR + 0x120000050UL)
#define LCA_MEM_BTR3		(IDENT_ADDR + 0x120000058UL)
#define LCA_MEM_GTR		(IDENT_ADDR + 0x120000060UL)
#define LCA_MEM_ESR		(IDENT_ADDR + 0x120000068UL)
#define LCA_MEM_EAR		(IDENT_ADDR + 0x120000070UL)
#define LCA_MEM_CAR		(IDENT_ADDR + 0x120000078UL)
#define LCA_MEM_VGR		(IDENT_ADDR + 0x120000080UL)
#define LCA_MEM_PLM		(IDENT_ADDR + 0x120000088UL)
#define LCA_MEM_FOR		(IDENT_ADDR + 0x120000090UL)

/*
 * I/O Controller registers:
 */
#define LCA_IOC_HAE		(IDENT_ADDR + 0x180000000UL)
#define LCA_IOC_CONF		(IDENT_ADDR + 0x180000020UL)
#define LCA_IOC_STAT0		(IDENT_ADDR + 0x180000040UL)
#define LCA_IOC_STAT1		(IDENT_ADDR + 0x180000060UL)
#define LCA_IOC_TBIA		(IDENT_ADDR + 0x180000080UL)
#define LCA_IOC_TB_ENA		(IDENT_ADDR + 0x1800000a0UL)
#define LCA_IOC_SFT_RST		(IDENT_ADDR + 0x1800000c0UL)
#define LCA_IOC_PAR_DIS		(IDENT_ADDR + 0x1800000e0UL)
#define LCA_IOC_W_BASE0		(IDENT_ADDR + 0x180000100UL)
#define LCA_IOC_W_BASE1		(IDENT_ADDR + 0x180000120UL)
#define LCA_IOC_W_MASK0		(IDENT_ADDR + 0x180000140UL)
#define LCA_IOC_W_MASK1		(IDENT_ADDR + 0x180000160UL)
#define LCA_IOC_T_BASE0		(IDENT_ADDR + 0x180000180UL)
#define LCA_IOC_T_BASE1		(IDENT_ADDR + 0x1800001a0UL)
#define LCA_IOC_TB_TAG0		(IDENT_ADDR + 0x188000000UL)
#define LCA_IOC_TB_TAG1		(IDENT_ADDR + 0x188000020UL)
#define LCA_IOC_TB_TAG2		(IDENT_ADDR + 0x188000040UL)
#define LCA_IOC_TB_TAG3		(IDENT_ADDR + 0x188000060UL)
#define LCA_IOC_TB_TAG4		(IDENT_ADDR + 0x188000070UL)
#define LCA_IOC_TB_TAG5		(IDENT_ADDR + 0x1880000a0UL)
#define LCA_IOC_TB_TAG6		(IDENT_ADDR + 0x1880000c0UL)
#define LCA_IOC_TB_TAG7		(IDENT_ADDR + 0x1880000e0UL)

/*
 * Memory spaces:
 */
#define LCA_IACK_SC		(IDENT_ADDR + 0x1a0000000UL)
#define LCA_CONF		(IDENT_ADDR + 0x1e0000000UL)
#define LCA_IO			(IDENT_ADDR + 0x1c0000000UL)
#define LCA_SPARSE_MEM		(IDENT_ADDR + 0x200000000UL)
#define LCA_DENSE_MEM		(IDENT_ADDR + 0x300000000UL)

/*
 * Bit definitions for I/O Controller status register 0:
 */
#define LCA_IOC_STAT0_CMD		0xf
#define LCA_IOC_STAT0_ERR		(1<<4)
#define LCA_IOC_STAT0_LOST		(1<<5)
#define LCA_IOC_STAT0_THIT		(1<<6)
#define LCA_IOC_STAT0_TREF		(1<<7)
#define LCA_IOC_STAT0_CODE_SHIFT	8
#define LCA_IOC_STAT0_CODE_MASK		0x7
#define LCA_IOC_STAT0_P_NBR_SHIFT	13
#define LCA_IOC_STAT0_P_NBR_MASK	0x7ffff

#define LCA_HAE_ADDRESS		LCA_IOC_HAE

/* LCA PMR Power Management register defines */
#define LCA_PMR_ADDR	(IDENT_ADDR + 0x120000098UL)
#define LCA_PMR_PDIV    0x7                     /* Primary clock divisor */
#define LCA_PMR_ODIV    0x38                    /* Override clock divisor */
#define LCA_PMR_INTO    0x40                    /* Interrupt override */
#define LCA_PMR_DMAO    0x80                    /* DMA override */
#define LCA_PMR_OCCEB   0xffff0000L             /* Override cycle counter - even bits */
#define LCA_PMR_OCCOB   0xffff000000000000L     /* Override cycle counter - even bits */
#define LCA_PMR_PRIMARY_MASK    0xfffffffffffffff8

/* LCA PMR Macros */

#define LCA_READ_PMR        (*(volatile unsigned long *)LCA_PMR_ADDR)
#define LCA_WRITE_PMR(d)    (*((volatile unsigned long *)LCA_PMR_ADDR) = (d))

#define LCA_GET_PRIMARY(r)  ((r) & LCA_PMR_PDIV)
#define LCA_GET_OVERRIDE(r) (((r) >> 3) & LCA_PMR_PDIV)
#define LCA_SET_PRIMARY_CLOCK(r, c) ((r) = (((r) & LCA_PMR_PRIMARY_MASK)|(c)))

/* LCA PMR Divisor values */
#define LCA_PMR_DIV_1   0x0
#define LCA_PMR_DIV_1_5 0x1
#define LCA_PMR_DIV_2   0x2
#define LCA_PMR_DIV_4   0x3
#define LCA_PMR_DIV_8   0x4
#define LCA_PMR_DIV_16  0x5
#define LCA_PMR_DIV_MIN DIV_1
#define LCA_PMR_DIV_MAX DIV_16


/*
 * Data structure for handling LCA machine checks.  Correctable errors
 * result in a short logout frame, uncorrectable ones in a long one.
 */
struct el_lca_mcheck_short {
	struct el_common	h;		/* common logout header */
	unsigned long		esr;		/* error-status register */
	unsigned long		ear;		/* error-address register */
	unsigned long		dc_stat;	/* dcache status register */
	unsigned long		ioc_stat0;	/* I/O controller status register 0 */
	unsigned long		ioc_stat1;	/* I/O controller status register 1 */
};

struct el_lca_mcheck_long {
	struct el_common	h;		/* common logout header */
	unsigned long		pt[31];		/* PAL temps */
	unsigned long		exc_addr;	/* exception address */
	unsigned long		pad1[3];
	unsigned long		pal_base;	/* PALcode base address */
	unsigned long		hier;		/* hw interrupt enable */
	unsigned long		hirr;		/* hw interrupt request */
	unsigned long		mm_csr;		/* MMU control & status */
	unsigned long		dc_stat;	/* data cache status */
	unsigned long		dc_addr;	/* data cache addr register */
	unsigned long		abox_ctl;	/* address box control register */
	unsigned long		esr;		/* error status register */
	unsigned long		ear;		/* error address register */
	unsigned long		car;		/* cache control register */
	unsigned long		ioc_stat0;	/* I/O controller status register 0 */
	unsigned long		ioc_stat1;	/* I/O controller status register 1 */
	unsigned long		va;		/* virtual address register */
};

union el_lca {
	struct el_common *		c;
	struct el_lca_mcheck_long *	l;
	struct el_lca_mcheck_short *	s;
};

#ifdef __KERNEL__

#ifndef __EXTERN_INLINE
#define __EXTERN_INLINE extern inline
#define __IO_EXTERN_INLINE
#endif

/*
 * Translate physical memory address as seen on (PCI) bus into
 * a kernel virtual address and vv.
 */

__EXTERN_INLINE unsigned long lca_virt_to_bus(void * address)
{
	return virt_to_phys(address) + LCA_DMA_WIN_BASE;
}

__EXTERN_INLINE void * lca_bus_to_virt(unsigned long address)
{
	/*
	 * This check is a sanity check but also ensures that bus
	 * address 0 maps to virtual address 0 which is useful to
	 * detect null "pointers" (the NCR driver is much simpler if
	 * NULL pointers are preserved).
	 */
	if (address < LCA_DMA_WIN_BASE)
		return 0;
	return phys_to_virt(address - LCA_DMA_WIN_BASE);
}

/*
 * I/O functions:
 *
 * Unlike Jensen, the Noname machines have no concept of local
 * I/O---everything goes over the PCI bus.
 *
 * There is plenty room for optimization here.  In particular,
 * the Alpha's insb/insw/extb/extw should be useful in moving
 * data to/from the right byte-lanes.
 */

#define vip	volatile int *
#define vuip	volatile unsigned int *
#define vulp	volatile unsigned long *

__EXTERN_INLINE unsigned int lca_inb(unsigned long addr)
{
	long result = *(vip) ((addr << 5) + LCA_IO + 0x00);
	return __kernel_extbl(result, addr & 3);
}

__EXTERN_INLINE void lca_outb(unsigned char b, unsigned long addr)
{
	unsigned long w;

	w = __kernel_insbl(b, addr & 3);
	*(vuip) ((addr << 5) + LCA_IO + 0x00) = w;
	mb();
}

__EXTERN_INLINE unsigned int lca_inw(unsigned long addr)
{
	long result = *(vip) ((addr << 5) + LCA_IO + 0x08);
	return __kernel_extwl(result, addr & 3);
}

__EXTERN_INLINE void lca_outw(unsigned short b, unsigned long addr)
{
	unsigned long w;

	w = __kernel_inswl(b, addr & 3);
	*(vuip) ((addr << 5) + LCA_IO + 0x08) = w;
	mb();
}

__EXTERN_INLINE unsigned int lca_inl(unsigned long addr)
{
	return *(vuip) ((addr << 5) + LCA_IO + 0x18);
}

__EXTERN_INLINE void lca_outl(unsigned int b, unsigned long addr)
{
	*(vuip) ((addr << 5) + LCA_IO + 0x18) = b;
	mb();
}


/*
 * Memory functions.  64-bit and 32-bit accesses are done through
 * dense memory space, everything else through sparse space.
 */

__EXTERN_INLINE unsigned long lca_readb(unsigned long addr)
{
	unsigned long result, msb;

	if (addr >= (1UL << 24)) {
		msb = addr & 0xf8000000;
		addr -= msb;
		set_hae(msb);
	}
	result = *(vip) ((addr << 5) + LCA_SPARSE_MEM + 0x00);
	return __kernel_extbl(result, addr & 3);
}

__EXTERN_INLINE unsigned long lca_readw(unsigned long addr)
{
	unsigned long result, msb;

	if (addr >= (1UL << 24)) {
		msb = addr & 0xf8000000;
		addr -= msb;
		set_hae(msb);
	}
	result = *(vip) ((addr << 5) + LCA_SPARSE_MEM + 0x08);
	return __kernel_extwl(result, addr & 3);
}

__EXTERN_INLINE unsigned long lca_readl(unsigned long addr)
{
	return *(vuip) (addr + LCA_DENSE_MEM);
}

__EXTERN_INLINE unsigned long lca_readq(unsigned long addr)
{
	return *(vulp) (addr + LCA_DENSE_MEM);
}

__EXTERN_INLINE void lca_writeb(unsigned char b, unsigned long addr)
{
	unsigned long msb;
	unsigned long w;

	if (addr >= (1UL << 24)) {
		msb = addr & 0xf8000000;
		addr -= msb;
		set_hae(msb);
	}
	w = __kernel_insbl(b, addr & 3);
	*(vuip) ((addr << 5) + LCA_SPARSE_MEM + 0x00) = w;
}

__EXTERN_INLINE void lca_writew(unsigned short b, unsigned long addr)
{
	unsigned long msb;
	unsigned long w;

	if (addr >= (1UL << 24)) {
		msb = addr & 0xf8000000;
		addr -= msb;
		set_hae(msb);
	}
	w = __kernel_inswl(b, addr & 3);
	*(vuip) ((addr << 5) + LCA_SPARSE_MEM + 0x08) = w;
}

__EXTERN_INLINE void lca_writel(unsigned int b, unsigned long addr)
{
	*(vuip) (addr + LCA_DENSE_MEM) = b;
}

__EXTERN_INLINE void lca_writeq(unsigned long b, unsigned long addr)
{
	*(vulp) (addr + LCA_DENSE_MEM) = b;
}

/* Find the DENSE memory area for a given bus address.  */

__EXTERN_INLINE unsigned long lca_dense_mem(unsigned long addr)
{
	return LCA_DENSE_MEM;
}

#undef vip
#undef vuip
#undef vulp

#ifdef __WANT_IO_DEF

#define virt_to_bus	lca_virt_to_bus
#define bus_to_virt	lca_bus_to_virt
#define __inb		lca_inb
#define __inw		lca_inw
#define __inl		lca_inl
#define __outb		lca_outb
#define __outw		lca_outw
#define __outl		lca_outl
#define __readb		lca_readb
#define __readw		lca_readw
#define __writeb	lca_writeb
#define __writew	lca_writew
#define __readl		lca_readl
#define __readq		lca_readq
#define __writel	lca_writel
#define __writeq	lca_writeq
#define dense_mem	lca_dense_mem

#define inb(port) \
(__builtin_constant_p((port))?__inb(port):_inb(port))

#define outb(x, port) \
(__builtin_constant_p((port))?__outb((x),(port)):_outb((x),(port)))

#define readl(a)	__readl((unsigned long)(a))
#define readq(a)	__readq((unsigned long)(a))
#define writel(v,a)	__writel((v),(unsigned long)(a))
#define writeq(v,a)	__writeq((v),(unsigned long)(a))

#endif /* __WANT_IO_DEF */

#ifdef __IO_EXTERN_INLINE
#undef __EXTERN_INLINE
#undef __IO_EXTERN_INLINE
#endif

#endif /* __KERNEL__ */

#endif /* __ALPHA_LCA__H__ */
