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