651 lines
13 KiB
C
651 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* 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.
|
|
*
|
|
* Send feedback to <greg@kroah.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/pci_hotplug.h>
|
|
#include <linux/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 __iomem *compaq_int15_entry_point;
|
|
|
|
/* lock for ordering int15_bios_call() */
|
|
static DEFINE_SPINLOCK(int15_lock);
|
|
|
|
|
|
/* 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 __iomem *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("%s - returned %d\n", __func__, 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\n" \
|
|
"xorl %%edx,%%edx\n" \
|
|
"pushf\n" \
|
|
"push %%cs\n" \
|
|
"cli\n" \
|
|
"call *%6\n"
|
|
: "=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 __iomem *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 __iomem *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, PCI_SLOT(ctrl->pci_dev->devfn), &usedbytes, &available);
|
|
if (rc)
|
|
return(rc);
|
|
|
|
/* The function Number */
|
|
rc = add_byte(&pFill, PCI_FUNC(ctrl->pci_dev->devfn), &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 __iomem *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);
|
|
}
|
|
|
|
|
|
int compaq_nvram_load(void __iomem *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 != PCI_SLOT(ctrl->pci_dev->devfn)) ||
|
|
(function != PCI_FUNC(ctrl->pci_dev->devfn))) {
|
|
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 = 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)) {
|
|
kfree(mem_node);
|
|
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)) {
|
|
kfree(mem_node);
|
|
return 2;
|
|
}
|
|
|
|
mem_node->next = ctrl->mem_head;
|
|
ctrl->mem_head = mem_node;
|
|
}
|
|
|
|
while (numpmem--) {
|
|
p_mem_node = 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)) {
|
|
kfree(p_mem_node);
|
|
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)) {
|
|
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;
|
|
}
|
|
|