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/*
* include/asm-sh/io_bigsur.c
*
* By Dustin McIntire (dustin@sensoria.com) (c)2001
* Derived from io_hd64465.h, which bore the message:
* By Greg Banks <gbanks@pocketpenguins.com>
* (c) 2000 PocketPenguins Inc.
* and from io_hd64461.h, which bore the message:
* Copyright 2000 Stuart Menefy (stuart.menefy@st.com)
*
* May be copied or modified under the terms of the GNU General Public
* License. See linux/COPYING for more information.
*
* IO functions for a Hitachi Big Sur Evaluation Board.
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/machvec.h>
#include <asm/io.h>
#include <asm/bigsur/bigsur.h>
/* Low iomap maps port 0-1K to addresses in 8byte chunks */
#define BIGSUR_IOMAP_LO_THRESH 0x400
#define BIGSUR_IOMAP_LO_SHIFT 3
#define BIGSUR_IOMAP_LO_MASK ((1<<BIGSUR_IOMAP_LO_SHIFT)-1)
#define BIGSUR_IOMAP_LO_NMAP (BIGSUR_IOMAP_LO_THRESH>>BIGSUR_IOMAP_LO_SHIFT)
static u32 bigsur_iomap_lo[BIGSUR_IOMAP_LO_NMAP];
static u8 bigsur_iomap_lo_shift[BIGSUR_IOMAP_LO_NMAP];
/* High iomap maps port 1K-64K to addresses in 1K chunks */
#define BIGSUR_IOMAP_HI_THRESH 0x10000
#define BIGSUR_IOMAP_HI_SHIFT 10
#define BIGSUR_IOMAP_HI_MASK ((1<<BIGSUR_IOMAP_HI_SHIFT)-1)
#define BIGSUR_IOMAP_HI_NMAP (BIGSUR_IOMAP_HI_THRESH>>BIGSUR_IOMAP_HI_SHIFT)
static u32 bigsur_iomap_hi[BIGSUR_IOMAP_HI_NMAP];
static u8 bigsur_iomap_hi_shift[BIGSUR_IOMAP_HI_NMAP];
#ifndef MAX
#define MAX(a,b) ((a)>(b)?(a):(b))
#endif
void bigsur_port_map(u32 baseport, u32 nports, u32 addr, u8 shift)
{
u32 port, endport = baseport + nports;
pr_debug("bigsur_port_map(base=0x%0x, n=0x%0x, addr=0x%08x)\n",
baseport, nports, addr);
for (port = baseport ;
port < endport && port < BIGSUR_IOMAP_LO_THRESH ;
port += (1<<BIGSUR_IOMAP_LO_SHIFT)) {
pr_debug(" maplo[0x%x] = 0x%08x\n", port, addr);
bigsur_iomap_lo[port>>BIGSUR_IOMAP_LO_SHIFT] = addr;
bigsur_iomap_lo_shift[port>>BIGSUR_IOMAP_LO_SHIFT] = shift;
addr += (1<<(BIGSUR_IOMAP_LO_SHIFT));
}
for (port = MAX(baseport, BIGSUR_IOMAP_LO_THRESH) ;
port < endport && port < BIGSUR_IOMAP_HI_THRESH ;
port += (1<<BIGSUR_IOMAP_HI_SHIFT)) {
pr_debug(" maphi[0x%x] = 0x%08x\n", port, addr);
bigsur_iomap_hi[port>>BIGSUR_IOMAP_HI_SHIFT] = addr;
bigsur_iomap_hi_shift[port>>BIGSUR_IOMAP_HI_SHIFT] = shift;
addr += (1<<(BIGSUR_IOMAP_HI_SHIFT));
}
}
EXPORT_SYMBOL(bigsur_port_map);
void bigsur_port_unmap(u32 baseport, u32 nports)
{
u32 port, endport = baseport + nports;
pr_debug("bigsur_port_unmap(base=0x%0x, n=0x%0x)\n", baseport, nports);
for (port = baseport ;
port < endport && port < BIGSUR_IOMAP_LO_THRESH ;
port += (1<<BIGSUR_IOMAP_LO_SHIFT)) {
bigsur_iomap_lo[port>>BIGSUR_IOMAP_LO_SHIFT] = 0;
}
for (port = MAX(baseport, BIGSUR_IOMAP_LO_THRESH) ;
port < endport && port < BIGSUR_IOMAP_HI_THRESH ;
port += (1<<BIGSUR_IOMAP_HI_SHIFT)) {
bigsur_iomap_hi[port>>BIGSUR_IOMAP_HI_SHIFT] = 0;
}
}
EXPORT_SYMBOL(bigsur_port_unmap);
unsigned long bigsur_isa_port2addr(unsigned long port)
{
unsigned long addr = 0;
unsigned char shift;
/* Physical address not in P0, do nothing */
if (PXSEG(port)) {
addr = port;
/* physical address in P0, map to P2 */
} else if (port >= 0x30000) {
addr = P2SEGADDR(port);
/* Big Sur I/O + HD64465 registers 0x10000-0x30000 */
} else if (port >= BIGSUR_IOMAP_HI_THRESH) {
addr = BIGSUR_INTERNAL_BASE + (port - BIGSUR_IOMAP_HI_THRESH);
/* Handle remapping of high IO/PCI IO ports */
} else if (port >= BIGSUR_IOMAP_LO_THRESH) {
addr = bigsur_iomap_hi[port >> BIGSUR_IOMAP_HI_SHIFT];
shift = bigsur_iomap_hi_shift[port >> BIGSUR_IOMAP_HI_SHIFT];
if (addr != 0)
addr += (port & BIGSUR_IOMAP_HI_MASK) << shift;
} else {
/* Handle remapping of low IO ports */
addr = bigsur_iomap_lo[port >> BIGSUR_IOMAP_LO_SHIFT];
shift = bigsur_iomap_lo_shift[port >> BIGSUR_IOMAP_LO_SHIFT];
if (addr != 0)
addr += (port & BIGSUR_IOMAP_LO_MASK) << shift;
}
pr_debug("%s(0x%08lx) = 0x%08lx\n", __FUNCTION__, port, addr);
return addr;
}
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