667 lines
13 KiB
C
667 lines
13 KiB
C
/*
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* Compaq Hot Plug Controller Driver
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*
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* Copyright (C) 1995,2001 Compaq Computer Corporation
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* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <greg@kroah.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include "cpqphp.h"
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#include "cpqphp_nvram.h"
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#define ROM_INT15_PHY_ADDR 0x0FF859
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#define READ_EV 0xD8A4
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#define WRITE_EV 0xD8A5
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struct register_foo {
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union {
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unsigned long lword; /* eax */
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unsigned short word; /* ax */
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struct {
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unsigned char low; /* al */
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unsigned char high; /* ah */
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} byte;
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} data;
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unsigned char opcode; /* see below */
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unsigned long length; /* if the reg. is a pointer, how much data */
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} __attribute__ ((packed));
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struct all_reg {
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struct register_foo eax_reg;
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struct register_foo ebx_reg;
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struct register_foo ecx_reg;
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struct register_foo edx_reg;
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struct register_foo edi_reg;
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struct register_foo esi_reg;
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struct register_foo eflags_reg;
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} __attribute__ ((packed));
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struct ev_hrt_header {
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u8 Version;
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u8 num_of_ctrl;
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u8 next;
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};
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struct ev_hrt_ctrl {
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u8 bus;
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u8 device;
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u8 function;
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u8 mem_avail;
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u8 p_mem_avail;
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u8 io_avail;
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u8 bus_avail;
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u8 next;
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};
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static u8 evbuffer_init;
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static u8 evbuffer_length;
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static u8 evbuffer[1024];
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static void __iomem *compaq_int15_entry_point;
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static spinlock_t int15_lock; /* lock for ordering int15_bios_call() */
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/* This is a series of function that deals with
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setting & getting the hotplug resource table in some environment variable.
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*/
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/*
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* We really shouldn't be doing this unless there is a _very_ good reason to!!!
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* greg k-h
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*/
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static u32 add_byte( u32 **p_buffer, u8 value, u32 *used, u32 *avail)
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{
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u8 **tByte;
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if ((*used + 1) > *avail)
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return(1);
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*((u8*)*p_buffer) = value;
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tByte = (u8**)p_buffer;
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(*tByte)++;
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*used+=1;
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return(0);
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}
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static u32 add_dword( u32 **p_buffer, u32 value, u32 *used, u32 *avail)
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{
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if ((*used + 4) > *avail)
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return(1);
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**p_buffer = value;
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(*p_buffer)++;
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*used+=4;
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return(0);
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}
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/*
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* check_for_compaq_ROM
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*
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* this routine verifies that the ROM OEM string is 'COMPAQ'
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*
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* returns 0 for non-Compaq ROM, 1 for Compaq ROM
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*/
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static int check_for_compaq_ROM (void __iomem *rom_start)
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{
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u8 temp1, temp2, temp3, temp4, temp5, temp6;
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int result = 0;
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temp1 = readb(rom_start + 0xffea + 0);
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temp2 = readb(rom_start + 0xffea + 1);
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temp3 = readb(rom_start + 0xffea + 2);
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temp4 = readb(rom_start + 0xffea + 3);
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temp5 = readb(rom_start + 0xffea + 4);
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temp6 = readb(rom_start + 0xffea + 5);
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if ((temp1 == 'C') &&
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(temp2 == 'O') &&
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(temp3 == 'M') &&
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(temp4 == 'P') &&
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(temp5 == 'A') &&
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(temp6 == 'Q')) {
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result = 1;
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}
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dbg ("%s - returned %d\n", __func__, result);
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return result;
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}
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static u32 access_EV (u16 operation, u8 *ev_name, u8 *buffer, u32 *buf_size)
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{
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unsigned long flags;
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int op = operation;
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int ret_val;
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if (!compaq_int15_entry_point)
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return -ENODEV;
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spin_lock_irqsave(&int15_lock, flags);
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__asm__ (
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"xorl %%ebx,%%ebx\n" \
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"xorl %%edx,%%edx\n" \
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"pushf\n" \
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"push %%cs\n" \
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"cli\n" \
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"call *%6\n"
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: "=c" (*buf_size), "=a" (ret_val)
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: "a" (op), "c" (*buf_size), "S" (ev_name),
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"D" (buffer), "m" (compaq_int15_entry_point)
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: "%ebx", "%edx");
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spin_unlock_irqrestore(&int15_lock, flags);
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return((ret_val & 0xFF00) >> 8);
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}
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/*
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* load_HRT
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*
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* Read the hot plug Resource Table from NVRAM
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*/
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static int load_HRT (void __iomem *rom_start)
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{
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u32 available;
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u32 temp_dword;
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u8 temp_byte = 0xFF;
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u32 rc;
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if (!check_for_compaq_ROM(rom_start)) {
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return -ENODEV;
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}
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available = 1024;
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// Now load the EV
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temp_dword = available;
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rc = access_EV(READ_EV, "CQTHPS", evbuffer, &temp_dword);
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evbuffer_length = temp_dword;
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// We're maintaining the resource lists so write FF to invalidate old info
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temp_dword = 1;
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rc = access_EV(WRITE_EV, "CQTHPS", &temp_byte, &temp_dword);
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return rc;
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}
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/*
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* store_HRT
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*
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* Save the hot plug Resource Table in NVRAM
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*/
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static u32 store_HRT (void __iomem *rom_start)
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{
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u32 *buffer;
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u32 *pFill;
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u32 usedbytes;
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u32 available;
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u32 temp_dword;
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u32 rc;
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u8 loop;
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u8 numCtrl = 0;
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struct controller *ctrl;
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struct pci_resource *resNode;
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struct ev_hrt_header *p_EV_header;
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struct ev_hrt_ctrl *p_ev_ctrl;
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available = 1024;
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if (!check_for_compaq_ROM(rom_start)) {
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return(1);
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}
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buffer = (u32*) evbuffer;
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if (!buffer)
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return(1);
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pFill = buffer;
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usedbytes = 0;
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p_EV_header = (struct ev_hrt_header *) pFill;
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ctrl = cpqhp_ctrl_list;
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// The revision of this structure
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rc = add_byte( &pFill, 1 + ctrl->push_flag, &usedbytes, &available);
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if (rc)
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return(rc);
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// The number of controllers
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rc = add_byte( &pFill, 1, &usedbytes, &available);
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if (rc)
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return(rc);
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while (ctrl) {
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p_ev_ctrl = (struct ev_hrt_ctrl *) pFill;
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numCtrl++;
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// The bus number
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rc = add_byte( &pFill, ctrl->bus, &usedbytes, &available);
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if (rc)
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return(rc);
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// The device Number
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rc = add_byte( &pFill, PCI_SLOT(ctrl->pci_dev->devfn), &usedbytes, &available);
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if (rc)
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return(rc);
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// The function Number
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rc = add_byte( &pFill, PCI_FUNC(ctrl->pci_dev->devfn), &usedbytes, &available);
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if (rc)
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return(rc);
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// Skip the number of available entries
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rc = add_dword( &pFill, 0, &usedbytes, &available);
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if (rc)
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return(rc);
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// Figure out memory Available
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resNode = ctrl->mem_head;
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loop = 0;
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while (resNode) {
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loop ++;
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// base
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rc = add_dword( &pFill, resNode->base, &usedbytes, &available);
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if (rc)
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return(rc);
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// length
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rc = add_dword( &pFill, resNode->length, &usedbytes, &available);
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if (rc)
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return(rc);
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resNode = resNode->next;
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}
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// Fill in the number of entries
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p_ev_ctrl->mem_avail = loop;
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// Figure out prefetchable memory Available
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resNode = ctrl->p_mem_head;
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loop = 0;
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while (resNode) {
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loop ++;
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// base
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rc = add_dword( &pFill, resNode->base, &usedbytes, &available);
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if (rc)
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return(rc);
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// length
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rc = add_dword( &pFill, resNode->length, &usedbytes, &available);
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if (rc)
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return(rc);
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resNode = resNode->next;
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}
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// Fill in the number of entries
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p_ev_ctrl->p_mem_avail = loop;
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// Figure out IO Available
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resNode = ctrl->io_head;
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loop = 0;
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while (resNode) {
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loop ++;
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// base
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rc = add_dword( &pFill, resNode->base, &usedbytes, &available);
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if (rc)
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return(rc);
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// length
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rc = add_dword( &pFill, resNode->length, &usedbytes, &available);
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if (rc)
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return(rc);
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resNode = resNode->next;
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}
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// Fill in the number of entries
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p_ev_ctrl->io_avail = loop;
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// Figure out bus Available
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resNode = ctrl->bus_head;
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loop = 0;
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while (resNode) {
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loop ++;
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// base
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rc = add_dword( &pFill, resNode->base, &usedbytes, &available);
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if (rc)
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return(rc);
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// length
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rc = add_dword( &pFill, resNode->length, &usedbytes, &available);
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if (rc)
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return(rc);
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resNode = resNode->next;
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}
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// Fill in the number of entries
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p_ev_ctrl->bus_avail = loop;
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ctrl = ctrl->next;
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}
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p_EV_header->num_of_ctrl = numCtrl;
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// Now store the EV
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temp_dword = usedbytes;
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rc = access_EV(WRITE_EV, "CQTHPS", (u8*) buffer, &temp_dword);
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dbg("usedbytes = 0x%x, length = 0x%x\n", usedbytes, temp_dword);
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evbuffer_length = temp_dword;
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if (rc) {
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err(msg_unable_to_save);
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return(1);
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}
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return(0);
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}
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void compaq_nvram_init (void __iomem *rom_start)
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{
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if (rom_start) {
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compaq_int15_entry_point = (rom_start + ROM_INT15_PHY_ADDR - ROM_PHY_ADDR);
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}
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dbg("int15 entry = %p\n", compaq_int15_entry_point);
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/* initialize our int15 lock */
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spin_lock_init(&int15_lock);
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}
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int compaq_nvram_load (void __iomem *rom_start, struct controller *ctrl)
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{
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u8 bus, device, function;
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u8 nummem, numpmem, numio, numbus;
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u32 rc;
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u8 *p_byte;
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struct pci_resource *mem_node;
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struct pci_resource *p_mem_node;
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struct pci_resource *io_node;
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struct pci_resource *bus_node;
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struct ev_hrt_ctrl *p_ev_ctrl;
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struct ev_hrt_header *p_EV_header;
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if (!evbuffer_init) {
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// Read the resource list information in from NVRAM
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if (load_HRT(rom_start))
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memset (evbuffer, 0, 1024);
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evbuffer_init = 1;
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}
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// If we saved information in NVRAM, use it now
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p_EV_header = (struct ev_hrt_header *) evbuffer;
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// The following code is for systems where version 1.0 of this
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// driver has been loaded, but doesn't support the hardware.
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// In that case, the driver would incorrectly store something
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// in NVRAM.
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if ((p_EV_header->Version == 2) ||
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((p_EV_header->Version == 1) && !ctrl->push_flag)) {
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p_byte = &(p_EV_header->next);
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p_ev_ctrl = (struct ev_hrt_ctrl *) &(p_EV_header->next);
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p_byte += 3;
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if (p_byte > ((u8*)p_EV_header + evbuffer_length))
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return 2;
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bus = p_ev_ctrl->bus;
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device = p_ev_ctrl->device;
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function = p_ev_ctrl->function;
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while ((bus != ctrl->bus) ||
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(device != PCI_SLOT(ctrl->pci_dev->devfn)) ||
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(function != PCI_FUNC(ctrl->pci_dev->devfn))) {
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nummem = p_ev_ctrl->mem_avail;
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numpmem = p_ev_ctrl->p_mem_avail;
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numio = p_ev_ctrl->io_avail;
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numbus = p_ev_ctrl->bus_avail;
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p_byte += 4;
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if (p_byte > ((u8*)p_EV_header + evbuffer_length))
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return 2;
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// Skip forward to the next entry
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p_byte += (nummem + numpmem + numio + numbus) * 8;
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if (p_byte > ((u8*)p_EV_header + evbuffer_length))
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return 2;
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p_ev_ctrl = (struct ev_hrt_ctrl *) p_byte;
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p_byte += 3;
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if (p_byte > ((u8*)p_EV_header + evbuffer_length))
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return 2;
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bus = p_ev_ctrl->bus;
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device = p_ev_ctrl->device;
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function = p_ev_ctrl->function;
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}
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nummem = p_ev_ctrl->mem_avail;
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numpmem = p_ev_ctrl->p_mem_avail;
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numio = p_ev_ctrl->io_avail;
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numbus = p_ev_ctrl->bus_avail;
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p_byte += 4;
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if (p_byte > ((u8*)p_EV_header + evbuffer_length))
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return 2;
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while (nummem--) {
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mem_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
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if (!mem_node)
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break;
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mem_node->base = *(u32*)p_byte;
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dbg("mem base = %8.8x\n",mem_node->base);
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p_byte += 4;
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if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
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kfree(mem_node);
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return 2;
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}
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mem_node->length = *(u32*)p_byte;
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dbg("mem length = %8.8x\n",mem_node->length);
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p_byte += 4;
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if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
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kfree(mem_node);
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return 2;
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}
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mem_node->next = ctrl->mem_head;
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ctrl->mem_head = mem_node;
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}
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while (numpmem--) {
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p_mem_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
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if (!p_mem_node)
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break;
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p_mem_node->base = *(u32*)p_byte;
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dbg("pre-mem base = %8.8x\n",p_mem_node->base);
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p_byte += 4;
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if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
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kfree(p_mem_node);
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return 2;
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}
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p_mem_node->length = *(u32*)p_byte;
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dbg("pre-mem length = %8.8x\n",p_mem_node->length);
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p_byte += 4;
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if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
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kfree(p_mem_node);
|
|
return 2;
|
|
}
|
|
|
|
p_mem_node->next = ctrl->p_mem_head;
|
|
ctrl->p_mem_head = p_mem_node;
|
|
}
|
|
|
|
while (numio--) {
|
|
io_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
|
|
|
|
if (!io_node)
|
|
break;
|
|
|
|
io_node->base = *(u32*)p_byte;
|
|
dbg("io base = %8.8x\n",io_node->base);
|
|
p_byte += 4;
|
|
|
|
if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
|
|
kfree(io_node);
|
|
return 2;
|
|
}
|
|
|
|
io_node->length = *(u32*)p_byte;
|
|
dbg("io length = %8.8x\n",io_node->length);
|
|
p_byte += 4;
|
|
|
|
if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
|
|
kfree(io_node);
|
|
return 2;
|
|
}
|
|
|
|
io_node->next = ctrl->io_head;
|
|
ctrl->io_head = io_node;
|
|
}
|
|
|
|
while (numbus--) {
|
|
bus_node = kmalloc(sizeof(struct pci_resource), GFP_KERNEL);
|
|
|
|
if (!bus_node)
|
|
break;
|
|
|
|
bus_node->base = *(u32*)p_byte;
|
|
p_byte += 4;
|
|
|
|
if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
|
|
kfree(bus_node);
|
|
return 2;
|
|
}
|
|
|
|
bus_node->length = *(u32*)p_byte;
|
|
p_byte += 4;
|
|
|
|
if (p_byte > ((u8*)p_EV_header + evbuffer_length)) {
|
|
kfree(bus_node);
|
|
return 2;
|
|
}
|
|
|
|
bus_node->next = ctrl->bus_head;
|
|
ctrl->bus_head = bus_node;
|
|
}
|
|
|
|
// If all of the following fail, we don't have any resources for
|
|
// hot plug add
|
|
rc = 1;
|
|
rc &= cpqhp_resource_sort_and_combine(&(ctrl->mem_head));
|
|
rc &= cpqhp_resource_sort_and_combine(&(ctrl->p_mem_head));
|
|
rc &= cpqhp_resource_sort_and_combine(&(ctrl->io_head));
|
|
rc &= cpqhp_resource_sort_and_combine(&(ctrl->bus_head));
|
|
|
|
if (rc)
|
|
return(rc);
|
|
} else {
|
|
if ((evbuffer[0] != 0) && (!ctrl->push_flag))
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int compaq_nvram_store (void __iomem *rom_start)
|
|
{
|
|
int rc = 1;
|
|
|
|
if (rom_start == NULL)
|
|
return -ENODEV;
|
|
|
|
if (evbuffer_init) {
|
|
rc = store_HRT(rom_start);
|
|
if (rc) {
|
|
err(msg_unable_to_save);
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|