diff options
Diffstat (limited to 'arch/sh/boards/bigsur/io.c')
| -rw-r--r-- | arch/sh/boards/bigsur/io.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/sh/boards/bigsur/io.c b/arch/sh/boards/bigsur/io.c new file mode 100644 index 00000000000..697144de741 --- /dev/null +++ b/arch/sh/boards/bigsur/io.c @@ -0,0 +1,125 @@ +/* + * 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; +} + |