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// 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 spinlock_t 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)
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