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