nile4.c
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上传日期:2013-04-10
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- /***********************************************************************
- *
- * Copyright 2001 MontaVista Software Inc.
- * Author: jsun@mvista.com or jsun@junsun.net
- *
- * arch/mips/ddb5xxx/common/nile4.c
- * misc low-level routines for vrc-5xxx controllers.
- *
- * derived from original code by Geert Uytterhoeven <geert@sonycom.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- *
- ***********************************************************************
- */
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <asm/ddb5xxx/ddb5xxx.h>
- u32
- ddb_calc_pdar(u32 phys, u32 size, int width,
- int on_memory_bus, int pci_visible)
- {
- u32 maskbits;
- u32 widthbits;
- switch (size) {
- #if 0 /* We don't support 4 GB yet */
- case 0x100000000: /* 4 GB */
- maskbits = 4;
- break;
- #endif
- case 0x80000000: /* 2 GB */
- maskbits = 5;
- break;
- case 0x40000000: /* 1 GB */
- maskbits = 6;
- break;
- case 0x20000000: /* 512 MB */
- maskbits = 7;
- break;
- case 0x10000000: /* 256 MB */
- maskbits = 8;
- break;
- case 0x08000000: /* 128 MB */
- maskbits = 9;
- break;
- case 0x04000000: /* 64 MB */
- maskbits = 10;
- break;
- case 0x02000000: /* 32 MB */
- maskbits = 11;
- break;
- case 0x01000000: /* 16 MB */
- maskbits = 12;
- break;
- case 0x00800000: /* 8 MB */
- maskbits = 13;
- break;
- case 0x00400000: /* 4 MB */
- maskbits = 14;
- break;
- case 0x00200000: /* 2 MB */
- maskbits = 15;
- break;
- case 0: /* OFF */
- maskbits = 0;
- break;
- default:
- panic("nile4_set_pdar: unsupported size %p", (void *) size);
- }
- switch (width) {
- case 8:
- widthbits = 0;
- break;
- case 16:
- widthbits = 1;
- break;
- case 32:
- widthbits = 2;
- break;
- case 64:
- widthbits = 3;
- break;
- default:
- panic("nile4_set_pdar: unsupported width %d", width);
- }
- return maskbits | (on_memory_bus ? 0x10 : 0) |
- (pci_visible ? 0x20 : 0) | (widthbits << 6) |
- (phys & 0xffe00000);
- }
- void
- ddb_set_pdar(u32 pdar, u32 phys, u32 size, int width,
- int on_memory_bus, int pci_visible)
- {
- u32 temp= ddb_calc_pdar(phys, size, width, on_memory_bus, pci_visible);
- ddb_out32(pdar, temp);
- ddb_out32(pdar + 4, 0);
- /*
- * When programming a PDAR, the register should be read immediately
- * after writing it. This ensures that address decoders are properly
- * configured.
- * [jsun] is this really necesary?
- */
- ddb_in32(pdar);
- ddb_in32(pdar + 4);
- }
- /*
- * routines that mess with PCIINITx registers
- */
- void ddb_set_pmr(u32 pmr, u32 type, u32 addr, u32 options)
- {
- switch (type) {
- case DDB_PCICMD_IACK: /* PCI Interrupt Acknowledge */
- case DDB_PCICMD_IO: /* PCI I/O Space */
- case DDB_PCICMD_MEM: /* PCI Memory Space */
- case DDB_PCICMD_CFG: /* PCI Configuration Space */
- break;
- default:
- panic("nile4_set_pmr: invalid type %d", type);
- }
- ddb_out32(pmr, (type << 1) | (addr & 0xffe00000) | options );
- ddb_out32(pmr + 4, 0);
- }