// SPDX-License-Identifier: GPL-2.0+
/*
* IBM Hot Plug Controller Driver
*
* Written By: Irene Zubarev, IBM Corporation
*
* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001,2002 IBM Corp.
*
* All rights reserved.
*
* Send feedback to <gregkh@us.ibm.com>
*
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/list.h>
#include "ibmphp.h"
static int configure_device(struct pci_func *);
static int configure_bridge(struct pci_func **, u8);
static struct res_needed *scan_behind_bridge(struct pci_func *, u8);
static int add_new_bus(struct bus_node *, struct resource_node *, struct resource_node *, struct resource_node *, u8);
static u8 find_sec_number(u8 primary_busno, u8 slotno);
/*
* NOTE..... If BIOS doesn't provide default routing, we assign:
* 9 for SCSI, 10 for LAN adapters, and 11 for everything else.
* If adapter is bridged, then we assign 11 to it and devices behind it.
* We also assign the same irq numbers for multi function devices.
* These are PIC mode, so shouldn't matter n.e.ways (hopefully)
*/
static void assign_alt_irq(struct pci_func *cur_func, u8 class_code)
{
int j;
for (j = 0; j < 4; j++) {
if (cur_func->irq[j] == 0xff) {
switch (class_code) {
case PCI_BASE_CLASS_STORAGE:
cur_func->irq[j] = SCSI_IRQ;
break;
case PCI_BASE_CLASS_NETWORK:
cur_func->irq[j] = LAN_IRQ;
break;
default:
cur_func->irq[j] = OTHER_IRQ;
break;
}
}
}
}
/*
* Configures the device to be added (will allocate needed resources if it
* can), the device can be a bridge or a regular pci device, can also be
* multi-functional
*
* Input: function to be added
*
* TO DO: The error case with Multifunction device or multi function bridge,
* if there is an error, will need to go through all previous functions and
* unconfigure....or can add some code into unconfigure_card....
*/
int ibmphp_configure_card(struct pci_func *func, u8 slotno)
{
u16 vendor_id;
u32 class;
u8 class_code;
u8 hdr_type, device, sec_number;
u8 function;
struct pci_func *newfunc; /* for multi devices */
struct pci_func *cur_func, *prev_func;
int rc, i, j;
int cleanup_count;
u8 flag;
u8 valid_device = 0x00; /* to see if we are able to read from card any device info at all */
debug("inside configure_card, func->busno = %x\n", func->busno);
device = func->device;
cur_func = func;
/* We only get bus and device from IRQ routing table. So at this point,
* func->busno is correct, and func->device contains only device (at the 5
* highest bits)
*/
/* For every function on the card */
for (function = 0x00; function < 0x08; function++) {
unsigned int devfn = PCI_DEVFN(device, function);
ibmphp_pci_bus->number = cur_func->busno;
cur_func->function = function;
debug("inside the loop, cur_func->busno = %x, cur_func->device = %x, cur_func->function = %x\n",
cur_func->busno, cur_func->device, cur_func->function);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
debug("vendor_id is %x\n", vendor_id);
if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
/* found correct device!!! */
debug("found valid device, vendor_id = %x\n", vendor_id);
++valid_device;
/* header: x x x x x x x x
* | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge
* |_=> 0 = single function device, 1 = multi-function device
*/
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
class_code = class >> 24;
debug("hrd_type = %x, class = %x, class_code %x\n", hdr_type, class, class_code);
class >>= 8; /* to take revision out, class = class.subclass.prog i/f */
if (class == PCI_CLASS_NOT_DEFINED_VGA) {
err("The device %x is VGA compatible and as is not supported for hot plugging. "
"Please choose another device.\n", cur_func->device);
return -ENODEV;
} else if (class == PCI_CLASS_DISPLAY_VGA) {
err("The device %x is not supported for hot plugging. Please choose another device.\n",
cur_func->device);
return -ENODEV;
}
switch (hdr_type) {
case PCI_HEADER_TYPE_NORMAL:
debug("single device case.... vendor id = %x, hdr_type = %x, class = %x\n", vendor_id, hdr_type, class);
assign_alt_irq(cur_func, class_code);
rc = configure_device(cur_func);
if (rc < 0) {
/* We need to do this in case some other BARs were properly inserted */
err("was not able to configure devfunc %x on bus %x.\n",
cur_func->device, cur_func->busno);
cleanup_count = 6;
goto error;
}
cur_func->next = NULL;
function = 0x8;
break;
case PCI_HEADER_TYPE_MULTIDEVICE:
assign_alt_irq(cur_func, class_code);
rc = configure_device(cur_func);
if (rc < 0) {
/* We need to do this in case some other BARs were properly inserted */
err("was not able to configure devfunc %x on bus %x...bailing out\n",
cur_func->device, cur_func->busno);
cleanup_count = 6;
goto error;
}
newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
if (!newfunc)
return -ENOMEM;
newfunc->busno = cur_func->busno;
newfunc->device = device;
cur_func->next = newfunc;
cur_func = newfunc;
for (j = 0; j < 4; j++)
newfunc->irq[j] = cur_func->irq[j];
break;
case PCI_HEADER_TYPE_MULTIBRIDGE:
class >>= 8;
if (class != PCI_CLASS_BRIDGE_PCI) {
err("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. Please insert another card.\n",
cur_func->device);
return -ENODEV;
}
assign_alt_irq(cur_func, class_code);
rc = configure_bridge(&cur_func, slotno);
if (rc == -ENODEV) {
err("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
err("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);
return rc;
}
if (rc) {
/* We need to do this in case some other BARs were properly inserted */
err("was not able to hot-add PPB properly.\n");
func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
cleanup_count = 2;
goto error;
}
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
flag = 0;
for (i = 0; i < 32; i++) {
if (func->devices[i]) {
newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
if (!newfunc)
return -ENOMEM;
newfunc->busno = sec_number;
newfunc->device = (u8) i;
for (j = 0; j < 4; j++)
newfunc->irq[j] = cur_func->irq[j];
if (flag) {
for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next) ;
prev_func->next = newfunc;
} else
cur_func->next = newfunc;
rc = ibmphp_configure_card(newfunc, slotno);
/* This could only happen if kmalloc failed */
if (rc) {
/* We need to do this in case bridge itself got configured properly, but devices behind it failed */
func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
cleanup_count = 2;
goto error;
}
flag = 1;
}
}
newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
if (!newfunc)
return -ENOMEM;
newfunc->busno = cur_func->busno;
newfunc->device = device;
for (j = 0; j < 4; j++)
newfunc->irq[j] = cur_func->irq[j];
for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next);
prev_func->next = newfunc;
cur_func = newfunc;
break;
case PCI_HEADER_TYPE_BRIDGE:
class >>= 8;
debug("class now is %x\n", class);
if (class != PCI_CLASS_BRIDGE_PCI) {
err("This %x is not PCI-to-PCI bridge, and as is not supported for hot-plugging. Please insert another card.\n",
cur_func->device);
return -ENODEV;
}
assign_alt_irq(cur_func, class_code);
debug("cur_func->busno b4 configure_bridge is %x\n", cur_func->busno);
rc = configure_bridge(&cur_func, slotno);
if (rc == -ENODEV) {
err("You chose to insert Single Bridge, or nested bridges, this is not supported...\n");
err("Bus %x, devfunc %x\n", cur_func->busno, cur_func->device);
return rc;
}
if (rc) {
/* We need to do this in case some other BARs were properly inserted */
func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
err("was not able to hot-add PPB properly.\n");
cleanup_count = 2;
goto error;
}
debug("cur_func->busno = %x, device = %x, function = %x\n",
cur_func->busno, device, function);
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
debug("after configuring bridge..., sec_number = %x\n", sec_number);
flag = 0;
for (i = 0; i < 32; i++) {
if (func->devices[i]) {
debug("inside for loop, device is %x\n", i);
newfunc = kzalloc(sizeof(*newfunc), GFP_KERNEL);
if (!newfunc)
return -ENOMEM;
newfunc->busno = sec_number;
newfunc->device = (u8) i;
for (j = 0; j < 4; j++)
newfunc->irq[j] = cur_func->irq[j];
if (flag) {
for (prev_func = cur_func; prev_func->next; prev_func = prev_func->next);
prev_func->next = newfunc;
} else
cur_func->next = newfunc;
rc = ibmphp_configure_card(newfunc, slotno);
/* Again, this case should not happen... For complete paranoia, will need to call remove_bus */
if (rc) {
/* We need to do this in case some other BARs were properly inserted */
func->bus = 1; /* To indicate to the unconfigure function that this is a PPB */
cleanup_count = 2;
goto error;
}
flag = 1;
}
}
function = 0x8;
break;
default:
err("MAJOR PROBLEM!!!!, header type not supported? %x\n", hdr_type);
return -ENXIO;
} /* end of switch */
} /* end of valid device */
} /* end of for */
if (!valid_device) {
err("Cannot find any valid devices on the card. Or unable to read from card.\n");
return -ENODEV;
}
return 0;
error:
for (i = 0; i < cleanup_count; i++) {
if (cur_func->io[i]) {
ibmphp_remove_resource(cur_func->io[i]);
cur_func->io[i] = NULL;
} else if (cur_func->pfmem[i]) {
ibmphp_remove_resource(cur_func->pfmem[i]);
cur_func->pfmem[i] = NULL;
} else if (cur_func->mem[i]) {
ibmphp_remove_resource(cur_func->mem[i]);
cur_func->mem[i] = NULL;
}
}
return rc;
}
/*
* This function configures the pci BARs of a single device.
* Input: pointer to the pci_func
* Output: configured PCI, 0, or error
*/
static int configure_device(struct pci_func *func)
{
u32 bar[6];
static const u32 address[] = {
PCI_BASE_ADDRESS_0,
PCI_BASE_ADDRESS_1,
PCI_BASE_ADDRESS_2,
PCI_BASE_ADDRESS_3,
PCI_BASE_ADDRESS_4,
PCI_BASE_ADDRESS_5,
0
};
u8 irq;
int count;
int len[6];
struct resource_node *io[6];
struct resource_node *mem[6];
struct resource_node *mem_tmp;
struct resource_node *pfmem[6];
unsigned int devfn;
debug("%s - inside\n", __func__);
devfn = PCI_DEVFN(func->device, func->function);
ibmphp_pci_bus->number = func->busno;
for (count = 0; address[count]; count++) { /* for 6 BARs */
/* not sure if i need this. per scott, said maybe need * something like this
if devices don't adhere 100% to the spec, so don't want to write
to the reserved bits
pcibios_read_config_byte(cur_func->busno, cur_func->device,
PCI_BASE_ADDRESS_0 + 4 * count, &tmp);
if (tmp & 0x01) // IO
pcibios_write_config_dword(cur_func->busno, cur_func->device,
PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFD);
else // Memory
pcibios_write_config_dword(cur_func->busno, cur_func->device,
PCI_BASE_ADDRESS_0 + 4 * count, 0xFFFFFFFF);
*/
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
if (!bar[count]) /* This BAR is not implemented */
continue;
debug("Device %x BAR %d wants %x\n", func->device, count, bar[count]);
if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
/* This is IO */
debug("inside IO SPACE\n");
len[count] = bar[count] & 0xFFFFFFFC;
len[count] = ~len[count] + 1;
debug("len[count] in IO %x, count %d\n", len[count], count);
io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!io[count])
return -ENOMEM;
io[count]->type = IO;
io[count]->busno = func->busno;
io[count]->devfunc = PCI_DEVFN(func->device, func->function);
io[count]->len = len[count];
if (ibmphp_check_resource(io[count], 0) == 0) {
ibmphp_add_resource(io[count]);
func->io[count] = io[count];
} else {
err("cannot allocate requested io for bus %x device %x function %x len %x\n",
func->busno, func->device, func->function, len[count]);
kfree(io[count]);
return -EIO;
}
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
/* _______________This is for debugging purposes only_____________________ */
debug("b4 writing, the IO address is %x\n", func->io[count]->start);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
debug("after writing.... the start address is %x\n", bar[count]);
/* _________________________________________________________________________*/
} else {
/* This is Memory */
if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
/* pfmem */
debug("PFMEM SPACE\n");
len[count] = bar[count] & 0xFFFFFFF0;
len[count] = ~len[count] + 1;
debug("len[count] in PFMEM %x, count %d\n", len[count], count);
pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!pfmem[count])
return -ENOMEM;
pfmem[count]->type = PFMEM;
pfmem[count]->busno = func->busno;
pfmem[count]->devfunc = PCI_DEVFN(func->device,
func->function);
pfmem[count]->len = len[count];
pfmem[count]->fromMem = 0;
if (ibmphp_check_resource(pfmem[count], 0) == 0) {
ibmphp_add_resource(pfmem[count]);
func->pfmem[count] = pfmem[count];
} else {
mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
if (!mem_tmp) {
kfree(pfmem[count]);
return -ENOMEM;
}
mem_tmp->type = MEM;
mem_tmp->busno = pfmem[count]->busno;
mem_tmp->devfunc = pfmem[count]->devfunc;
mem_tmp->len = pfmem[count]->len;
debug("there's no pfmem... going into mem.\n");
if (ibmphp_check_resource(mem_tmp, 0) == 0) {
ibmphp_add_resource(mem_tmp);
pfmem[count]->fromMem = 1;
pfmem[count]->rangeno = mem_tmp->rangeno;
pfmem[count]->start = mem_tmp->start;
pfmem[count]->end = mem_tmp->end;
ibmphp_add_pfmem_from_mem(pfmem[count]);
func->pfmem[count] = pfmem[count];
} else {
err("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
func->busno, func->device, len[count]);
kfree(mem_tmp);
kfree(pfmem[count]);
return -EIO;
}
}
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
/*_______________This is for debugging purposes only______________________________*/
debug("b4 writing, start address is %x\n", func->pfmem[count]->start);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
debug("after writing, start address is %x\n", bar[count]);
/*_________________________________________________________________________________*/
if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) { /* takes up another dword */
debug("inside the mem 64 case, count %d\n", count);
count += 1;
/* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
}
} else {
/* regular memory */
debug("REGULAR MEM SPACE\n");
len[count] = bar[count] & 0xFFFFFFF0;
len[count] = ~len[count] + 1;
debug("len[count] in Mem %x, count %d\n", len[count], count);
mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!mem[count])
return -ENOMEM;
mem[count]->type = MEM;
mem[count]->busno = func->busno;
mem[count]->devfunc = PCI_DEVFN(func->device,
func->function);
mem[count]->len = len[count];
if (ibmphp_check_resource(mem[count], 0) == 0) {
ibmphp_add_resource(mem[count]);
func->mem[count] = mem[count];
} else {
err("cannot allocate requested mem for bus %x, device %x, len %x\n",
func->busno, func->device, len[count]);
kfree(mem[count]);
return -EIO;
}
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
/* _______________________This is for debugging purposes only _______________________*/
debug("b4 writing, start address is %x\n", func->mem[count]->start);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
debug("after writing, the address is %x\n", bar[count]);
/* __________________________________________________________________________________*/
if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
/* takes up another dword */
debug("inside mem 64 case, reg. mem, count %d\n", count);
count += 1;
/* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
}
}
} /* end of mem */
} /* end of for */
func->bus = 0; /* To indicate that this is not a PPB */
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
if ((irq > 0x00) && (irq < 0x05))
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_ROM_ADDRESS, 0x00L);
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
return 0;
}
/******************************************************************************
* This routine configures a PCI-2-PCI bridge and the functions behind it
* Parameters: pci_func
* Returns:
******************************************************************************/
static int configure_bridge(struct pci_func **func_passed, u8 slotno)
{
int count;
int i;
int rc;
u8 sec_number;
u8 io_base;
u16 pfmem_base;
u32 bar[2];
u32 len[2];
u8 flag_io = 0;
u8 flag_mem = 0;
u8 flag_pfmem = 0;
u8 need_io_upper = 0;
u8 need_pfmem_upper = 0;
struct res_needed *amount_needed = NULL;
struct resource_node *io = NULL;
struct resource_node *bus_io[2] = {NULL, NULL};
struct resource_node *mem = NULL;
struct resource_node *bus_mem[2] = {NULL, NULL};
struct resource_node *mem_tmp = NULL;
struct resource_node *pfmem = NULL;
struct resource_node *bus_pfmem[2] = {NULL, NULL};
struct bus_node *bus;
static const u32 address[] = {
PCI_BASE_ADDRESS_0,
PCI_BASE_ADDRESS_1,
0
};
struct pci_func *func = *func_passed;
unsigned int devfn;
u8 irq;
int retval;
debug("%s - enter\n", __func__);
devfn = PCI_DEVFN(func->function, func->device);
ibmphp_pci_bus->number = func->busno;
/* Configuring necessary info for the bridge so that we could see the devices
* behind it
*/
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, func->busno);
/* _____________________For debugging purposes only __________________________
pci_bus_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);
debug("primary # written into the bridge is %x\n", pri_number);
___________________________________________________________________________*/
/* in EBDA, only get allocated 1 additional bus # per slot */
sec_number = find_sec_number(func->busno, slotno);
if (sec_number == 0xff) {
err("cannot allocate secondary bus number for the bridged device\n");
return -EINVAL;
}
debug("after find_sec_number, the number we got is %x\n", sec_number);
debug("AFTER FIND_SEC_NUMBER, func->busno IS %x\n", func->busno);
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, sec_number);
/* __________________For debugging purposes only __________________________________
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
debug("sec_number after write/read is %x\n", sec_number);
________________________________________________________________________________*/
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, sec_number);
/* __________________For debugging purposes only ____________________________________
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sec_number);
debug("subordinate number after write/read is %x\n", sec_number);
__________________________________________________________________________________*/
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_CACHE_LINE_SIZE, CACHE);
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_LATENCY_TIMER, LATENCY);
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_SEC_LATENCY_TIMER, LATENCY);
debug("func->busno is %x\n", func->busno);
debug("sec_number after writing is %x\n", sec_number);
/* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!NEED TO ADD!!! FAST BACK-TO-BACK ENABLE!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*/
/* First we need to allocate mem/io for the bridge itself in case it needs it */
for (count = 0; address[count]; count++) { /* for 2 BARs */
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
if (!bar[count]) {
/* This BAR is not implemented */
debug("so we come here then, eh?, count = %d\n", count);
continue;
}
// tmp_bar = bar[count];
debug("Bar %d wants %x\n", count, bar[count]);
if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
/* This is IO */
len[count] = bar[count] & 0xFFFFFFFC;
len[count] = ~len[count] + 1;
debug("len[count] in IO = %x\n", len[count]);
bus_io[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!bus_io[count]) {
retval = -ENOMEM;
goto error;
}
bus_io[count]->type = IO;
bus_io[count]->busno = func->busno;
bus_io[count]->devfunc = PCI_DEVFN(func->device,
func->function);
bus_io[count]->len = len[count];
if (ibmphp_check_resource(bus_io[count], 0) == 0) {
ibmphp_add_resource(bus_io[count]);
func->io[count] = bus_io[count];
} else {
err("cannot allocate requested io for bus %x, device %x, len %x\n",
func->busno, func->device, len[count]);
kfree(bus_io[count]);
return -EIO;
}
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->io[count]->start);
} else {
/* This is Memory */
if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
/* pfmem */
len[count] = bar[count] & 0xFFFFFFF0;
len[count] = ~len[count] + 1;
debug("len[count] in PFMEM = %x\n", len[count]);
bus_pfmem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!bus_pfmem[count]) {
retval = -ENOMEM;
goto error;
}
bus_pfmem[count]->type = PFMEM;
bus_pfmem[count]->busno = func->busno;
bus_pfmem[count]->devfunc = PCI_DEVFN(func->device,
func->function);
bus_pfmem[count]->len = len[count];
bus_pfmem[count]->fromMem = 0;
if (ibmphp_check_resource(bus_pfmem[count], 0) == 0) {
ibmphp_add_resource(bus_pfmem[count]);
func->pfmem[count] = bus_pfmem[count];
} else {
mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
if (!mem_tmp) {
retval = -ENOMEM;
goto error;
}
mem_tmp->type = MEM;
mem_tmp->busno = bus_pfmem[count]->busno;
mem_tmp->devfunc = bus_pfmem[count]->devfunc;
mem_tmp->len = bus_pfmem[count]->len;
if (ibmphp_check_resource(mem_tmp, 0) == 0) {
ibmphp_add_resource(mem_tmp);
bus_pfmem[count]->fromMem = 1;
bus_pfmem[count]->rangeno = mem_tmp->rangeno;
ibmphp_add_pfmem_from_mem(bus_pfmem[count]);
func->pfmem[count] = bus_pfmem[count];
} else {
err("cannot allocate requested pfmem for bus %x, device %x, len %x\n",
func->busno, func->device, len[count]);
kfree(mem_tmp);
kfree(bus_pfmem[count]);
return -EIO;
}
}
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->pfmem[count]->start);
if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
/* takes up another dword */
count += 1;
/* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
}
} else {
/* regular memory */
len[count] = bar[count] & 0xFFFFFFF0;
len[count] = ~len[count] + 1;
debug("len[count] in Memory is %x\n", len[count]);
bus_mem[count] = kzalloc(sizeof(struct resource_node), GFP_KERNEL);
if (!bus_mem[count]) {
retval = -ENOMEM;
goto error;
}
bus_mem[count]->type = MEM;
bus_mem[count]->busno = func->busno;
bus_mem[count]->devfunc = PCI_DEVFN(func->device,
func->function);
bus_mem[count]->len = len[count];
if (ibmphp_check_resource(bus_mem[count], 0) == 0) {
ibmphp_add_resource(bus_mem[count]);
func->mem[count] = bus_mem[count];
} else {
err("cannot allocate requested mem for bus %x, device %x, len %x\n",
func->busno, func->device, len[count]);
kfree(bus_mem[count]);
return -EIO;
}
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], func->mem[count]->start);
if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
/* takes up another dword */
count += 1;
/* on the 2nd dword, write all 0s, since we can't handle them n.e.ways */
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0x00000000);
}
}
} /* end of mem */
} /* end of for */
/* Now need to see how much space the devices behind the bridge needed */
amount_needed = scan_behind_bridge(func, sec_number);
if (amount_needed == NULL)
return -ENOMEM;
ibmphp_pci_bus->number = func->busno;
debug("after coming back from scan_behind_bridge\n");
debug("amount_needed->not_correct = %x\n", amount_needed->not_correct);
debug("amount_needed->io = %x\n", amount_needed->io);
debug("amount_needed->mem = %x\n", amount_needed->mem);
debug("amount_needed->pfmem = %x\n", amount_needed->pfmem);
if (amount_needed->not_correct) {
debug("amount_needed is not correct\n");
for (count = 0; address[count]; count++) {
/* for 2 BARs */
if (bus_io[count]) {
ibmphp_remove_resource(bus_io[count]);
func->io[count] = NULL;
} else if (bus_pfmem[count]) {
ibmphp_remove_resource(bus_pfmem[count]);
func->pfmem[count] = NULL;
} else if (bus_mem[count]) {
ibmphp_remove_resource(bus_mem[count]);
func->mem[count] = NULL;
}
}
kfree(amount_needed);
return -ENODEV;
}
if (!amount_needed->io) {
debug("it doesn't want IO?\n");
flag_io = 1;
} else {
debug("it wants %x IO behind the bridge\n", amount_needed->io);
io = kzalloc(sizeof(*io), GFP_KERNEL);
if (!io) {
retval = -ENOMEM;
goto error;
}
io->type = IO;
io->busno = func->busno;
io->devfunc = PCI_DEVFN(func->device, func->function);
io->len = amount_needed->io;
if (ibmphp_check_resource(io, 1) == 0) {
debug("were we able to add io\n");
ibmphp_add_resource(io);
flag_io = 1;
}
}
if (!amount_needed->mem) {
debug("it doesn't want n.e.memory?\n");
flag_mem = 1;
} else {
debug("it wants %x memory behind the bridge\n", amount_needed->mem);
mem = kzalloc(sizeof(*mem), GFP_KERNEL);
if (!mem) {
retval = -ENOMEM;
goto error;
}
mem->type = MEM;
mem->busno = func->busno;
mem->devfunc = PCI_DEVFN(func->device, func->function);
mem->len = amount_needed->mem;
if (ibmphp_check_resource(mem, 1) == 0) {
ibmphp_add_resource(mem);
flag_mem = 1;
debug("were we able to add mem\n");
}
}
if (!amount_needed->pfmem) {
debug("it doesn't want n.e.pfmem mem?\n");
flag_pfmem = 1;
} else {
debug("it wants %x pfmemory behind the bridge\n", amount_needed->pfmem);
pfmem = kzalloc(sizeof(*pfmem), GFP_KERNEL);
if (!pfmem) {
retval = -ENOMEM;
goto error;
}
pfmem->type = PFMEM;
pfmem->busno = func->busno;
pfmem->devfunc = PCI_DEVFN(func->device, func->function);
pfmem->len = amount_needed->pfmem;
pfmem->fromMem = 0;
if (ibmphp_check_resource(pfmem, 1) == 0) {
ibmphp_add_resource(pfmem);
flag_pfmem = 1;
} else {
mem_tmp = kzalloc(sizeof(*mem_tmp), GFP_KERNEL);
if (!mem_tmp) {
retval = -ENOMEM;
goto error;
}
mem_tmp->type = MEM;
mem_tmp->busno = pfmem->busno;
mem_tmp->devfunc = pfmem->devfunc;
mem_tmp->len = pfmem->len;
if (ibmphp_check_resource(mem_tmp, 1) == 0) {
ibmphp_add_resource(mem_tmp);
pfmem->fromMem = 1;
pfmem->rangeno = mem_tmp->rangeno;
ibmphp_add_pfmem_from_mem(pfmem);
flag_pfmem = 1;
}
}
}
debug("b4 if (flag_io && flag_mem && flag_pfmem)\n");
debug("flag_io = %x, flag_mem = %x, flag_pfmem = %x\n", flag_io, flag_mem, flag_pfmem);
if (flag_io && flag_mem && flag_pfmem) {
/* If on bootup, there was a bridged card in this slot,
* then card was removed and ibmphp got unloaded and loaded
* back again, there's no way for us to remove the bus
* struct, so no need to kmalloc, can use existing node
*/
bus = ibmphp_find_res_bus(sec_number);
if (!bus) {
bus = kzalloc(sizeof(*bus), GFP_KERNEL);
if (!bus) {
retval = -ENOMEM;
goto error;
}
bus->busno = sec_number;
debug("b4 adding new bus\n");
rc = add_new_bus(bus, io, mem, pfmem, func->busno);
} else if (!(bus->rangeIO) && !(bus->rangeMem) && !(bus->rangePFMem))
rc = add_new_bus(bus, io, mem, pfmem, 0xFF);
else {
err("expected bus structure not empty?\n");
retval = -EIO;
goto error;
}
if (rc) {
if (rc == -ENOMEM) {
ibmphp_remove_bus(bus, func->busno);
kfree(amount_needed);
return rc;
}
retval = rc;
goto error;
}
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &io_base);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &pfmem_base);
if ((io_base & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
debug("io 32\n");
need_io_upper = 1;
}
if ((pfmem_base & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
debug("pfmem 64\n");
need_pfmem_upper = 1;
}
if (bus->noIORanges) {
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00 | bus->rangeIO->start >> 8);
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00 | bus->rangeIO->end >> 8);
/* _______________This is for debugging purposes only ____________________
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, &temp);
debug("io_base = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, &temp);
debug("io_limit = %x\n", (temp & PCI_IO_RANGE_TYPE_MASK) << 8);
________________________________________________________________________*/
if (need_io_upper) { /* since can't support n.e.ways */
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_BASE_UPPER16, 0x0000);
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, 0x0000);
}
} else {
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_BASE, 0x00);
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_IO_LIMIT, 0x00);
}
if (bus->noMemRanges) {
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0x0000 | bus->rangeMem->start >> 16);
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000 | bus->rangeMem->end >> 16);
/* ____________________This is for debugging purposes only ________________________
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, &temp);
debug("mem_base = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, &temp);
debug("mem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
__________________________________________________________________________________*/
} else {
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_BASE, 0xffff);
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_MEMORY_LIMIT, 0x0000);
}
if (bus->noPFMemRanges) {
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0x0000 | bus->rangePFMem->start >> 16);
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000 | bus->rangePFMem->end >> 16);
/* __________________________This is for debugging purposes only _______________________
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, &temp);
debug("pfmem_base = %x", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, &temp);
debug("pfmem_limit = %x\n", (temp & PCI_MEMORY_RANGE_TYPE_MASK) << 16);
______________________________________________________________________________________*/
if (need_pfmem_upper) { /* since can't support n.e.ways */
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_BASE_UPPER32, 0x00000000);
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, PCI_PREF_LIMIT_UPPER32, 0x00000000);
}
} else {
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_BASE, 0xffff);
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_PREF_MEMORY_LIMIT, 0x0000);
}
debug("b4 writing control information\n");
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_PIN, &irq);
if ((irq > 0x00) && (irq < 0x05))
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_INTERRUPT_LINE, func->irq[irq - 1]);
/*
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, ctrl);
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_PARITY);
pci_bus_write_config_byte(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, PCI_BRIDGE_CTL_SERR);
*/
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_COMMAND, DEVICEENABLE);
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_BRIDGE_CONTROL, 0x07);
for (i = 0; i < 32; i++) {
if (amount_needed->devices[i]) {
debug("device where devices[i] is 1 = %x\n", i);
func->devices[i] = 1;
}
}
func->bus = 1; /* For unconfiguring, to indicate it's PPB */
func_passed = &func;
debug("func->busno b4 returning is %x\n", func->busno);
debug("func->busno b4 returning in the other structure is %x\n", (*func_passed)->busno);
kfree(amount_needed);
return 0;
} else {
err("Configuring bridge was unsuccessful...\n");
mem_tmp = NULL;
retval = -EIO;
goto error;
}
error:
kfree(amount_needed);
if (pfmem)
ibmphp_remove_resource(pfmem);
if (io)
ibmphp_remove_resource(io);
if (mem)
ibmphp_remove_resource(mem);
for (i = 0; i < 2; i++) { /* for 2 BARs */
if (bus_io[i]) {
ibmphp_remove_resource(bus_io[i]);
func->io[i] = NULL;
} else if (bus_pfmem[i]) {
ibmphp_remove_resource(bus_pfmem[i]);
func->pfmem[i] = NULL;
} else if (bus_mem[i]) {
ibmphp_remove_resource(bus_mem[i]);
func->mem[i] = NULL;
}
}
return retval;
}
/*****************************************************************************
* This function adds up the amount of resources needed behind the PPB bridge
* and passes it to the configure_bridge function
* Input: bridge function
* Output: amount of resources needed
*****************************************************************************/
static struct res_needed *scan_behind_bridge(struct pci_func *func, u8 busno)
{
int count, len[6];
u16 vendor_id;
u8 hdr_type;
u8 device, function;
unsigned int devfn;
int howmany = 0; /*this is to see if there are any devices behind the bridge */
u32 bar[6], class;
static const u32 address[] = {
PCI_BASE_ADDRESS_0,
PCI_BASE_ADDRESS_1,
PCI_BASE_ADDRESS_2,
PCI_BASE_ADDRESS_3,
PCI_BASE_ADDRESS_4,
PCI_BASE_ADDRESS_5,
0
};
struct res_needed *amount;
amount = kzalloc(sizeof(*amount), GFP_KERNEL);
if (amount == NULL)
return NULL;
ibmphp_pci_bus->number = busno;
debug("the bus_no behind the bridge is %x\n", busno);
debug("scanning devices behind the bridge...\n");
for (device = 0; device < 32; device++) {
amount->devices[device] = 0;
for (function = 0; function < 8; function++) {
devfn = PCI_DEVFN(device, function);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
/* found correct device!!! */
howmany++;
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
debug("hdr_type behind the bridge is %x\n", hdr_type);
if ((hdr_type & 0x7f) == PCI_HEADER_TYPE_BRIDGE) {
err("embedded bridges not supported for hot-plugging.\n");
amount->not_correct = 1;
return amount;
}
class >>= 8; /* to take revision out, class = class.subclass.prog i/f */
if (class == PCI_CLASS_NOT_DEFINED_VGA) {
err("The device %x is VGA compatible and as is not supported for hot plugging. Please choose another device.\n", device);
amount->not_correct = 1;
return amount;
} else if (class == PCI_CLASS_DISPLAY_VGA) {
err("The device %x is not supported for hot plugging. Please choose another device.\n", device);
amount->not_correct = 1;
return amount;
}
amount->devices[device] = 1;
for (count = 0; address[count]; count++) {
/* for 6 BARs */
/*
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, address[count], &tmp);
if (tmp & 0x01) // IO
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFD);
else // MEMORY
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
*/
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &bar[count]);
debug("what is bar[count]? %x, count = %d\n", bar[count], count);
if (!bar[count]) /* This BAR is not implemented */
continue;
//tmp_bar = bar[count];
debug("count %d device %x function %x wants %x resources\n", count, device, function, bar[count]);
if (bar[count] & PCI_BASE_ADDRESS_SPACE_IO) {
/* This is IO */
len[count] = bar[count] & 0xFFFFFFFC;
len[count] = ~len[count] + 1;
amount->io += len[count];
} else {
/* This is Memory */
if (bar[count] & PCI_BASE_ADDRESS_MEM_PREFETCH) {
/* pfmem */
len[count] = bar[count] & 0xFFFFFFF0;
len[count] = ~len[count] + 1;
amount->pfmem += len[count];
if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64)
/* takes up another dword */
count += 1;
} else {
/* regular memory */
len[count] = bar[count] & 0xFFFFFFF0;
len[count] = ~len[count] + 1;
amount->mem += len[count];
if (bar[count] & PCI_BASE_ADDRESS_MEM_TYPE_64) {
/* takes up another dword */
count += 1;
}
}
}
} /* end for */
} /* end if (valid) */
} /* end for */
} /* end for */
if (!howmany)
amount->not_correct = 1;
else
amount->not_correct = 0;
if ((amount->io) && (amount->io < IOBRIDGE))
amount->io = IOBRIDGE;
if ((amount->mem) && (amount->mem < MEMBRIDGE))
amount->mem = MEMBRIDGE;
if ((amount->pfmem) && (amount->pfmem < MEMBRIDGE))
amount->pfmem = MEMBRIDGE;
return amount;
}
/* The following 3 unconfigure_boot_ routines deal with the case when we had the card
* upon bootup in the system, since we don't allocate func to such case, we need to read
* the start addresses from pci config space and then find the corresponding entries in
* our resource lists. The functions return either 0, -ENODEV, or -1 (general failure)
* Change: we also call these functions even if we configured the card ourselves (i.e., not
* the bootup case), since it should work same way
*/
static int unconfigure_boot_device(u8 busno, u8 device, u8 function)
{
u32 start_address;
static const u32 address[] = {
PCI_BASE_ADDRESS_0,
PCI_BASE_ADDRESS_1,
PCI_BASE_ADDRESS_2,
PCI_BASE_ADDRESS_3,
PCI_BASE_ADDRESS_4,
PCI_BASE_ADDRESS_5,
0
};
int count;
struct resource_node *io;
struct resource_node *mem;
struct resource_node *pfmem;
struct bus_node *bus;
u32 end_address;
u32 temp_end;
u32 size;
u32 tmp_address;
unsigned int devfn;
debug("%s - enter\n", __func__);
bus = ibmphp_find_res_bus(busno);
if (!bus) {
debug("cannot find corresponding bus.\n");
return -EINVAL;
}
devfn = PCI_DEVFN(device, function);
ibmphp_pci_bus->number = busno;
for (count = 0; address[count]; count++) { /* for 6 BARs */
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address);
/* We can do this here, b/c by that time the device driver of the card has been stopped */
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], 0xFFFFFFFF);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &size);
pci_bus_write_config_dword(ibmphp_pci_bus, devfn, address[count], start_address);
debug("start_address is %x\n", start_address);
debug("busno, device, function %x %x %x\n", busno, device, function);
if (!size) {
/* This BAR is not implemented */
debug("is this bar no implemented?, count = %d\n", count);
continue;
}
tmp_address = start_address;
if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
/* This is IO */
start_address &= PCI_BASE_ADDRESS_IO_MASK;
size = size & 0xFFFFFFFC;
size = ~size + 1;
end_address = start_address + size - 1;
if (ibmphp_find_resource(bus, start_address, &io, IO))
goto report_search_failure;
debug("io->start = %x\n", io->start);
temp_end = io->end;
start_address = io->end + 1;
ibmphp_remove_resource(io);
/* This is needed b/c of the old I/O restrictions in the BIOS */
while (temp_end < end_address) {
if (ibmphp_find_resource(bus, start_address,
&io, IO))
goto report_search_failure;
debug("io->start = %x\n", io->start);
temp_end = io->end;
start_address = io->end + 1;
ibmphp_remove_resource(io);
}
/* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
} else {
/* This is Memory */
if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
/* pfmem */
debug("start address of pfmem is %x\n", start_address);
start_address &= PCI_BASE_ADDRESS_MEM_MASK;
if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) {
err("cannot find corresponding PFMEM resource to remove\n");
return -EIO;
}
if (pfmem) {
debug("pfmem->start = %x\n", pfmem->start);
ibmphp_remove_resource(pfmem);
}
} else {
/* regular memory */
debug("start address of mem is %x\n", start_address);
start_address &= PCI_BASE_ADDRESS_MEM_MASK;
if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) {
err("cannot find corresponding MEM resource to remove\n");
return -EIO;
}
if (mem) {
debug("mem->start = %x\n", mem->start);
ibmphp_remove_resource(mem);
}
}
if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
/* takes up another dword */
count += 1;
}
} /* end of mem */
} /* end of for */
return 0;
report_search_failure:
err("cannot find corresponding IO resource to remove\n");
return -EIO;
}
static int unconfigure_boot_bridge(u8 busno, u8 device, u8 function)
{
int count;
int bus_no, pri_no, sub_no, sec_no = 0;
u32 start_address, tmp_address;
u8 sec_number, sub_number, pri_number;
struct resource_node *io = NULL;
struct resource_node *mem = NULL;
struct resource_node *pfmem = NULL;
struct bus_node *bus;
static const u32 address[] = {
PCI_BASE_ADDRESS_0,
PCI_BASE_ADDRESS_1,
0
};
unsigned int devfn;
devfn = PCI_DEVFN(device, function);
ibmphp_pci_bus->number = busno;
bus_no = (int) busno;
debug("busno is %x\n", busno);
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_PRIMARY_BUS, &pri_number);
debug("%s - busno = %x, primary_number = %x\n", __func__, busno, pri_number);
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SECONDARY_BUS, &sec_number);
debug("sec_number is %x\n", sec_number);
sec_no = (int) sec_number;
pri_no = (int) pri_number;
if (pri_no != bus_no) {
err("primary numbers in our structures and pci config space don't match.\n");
return -EINVAL;
}
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_SUBORDINATE_BUS, &sub_number);
sub_no = (int) sub_number;
debug("sub_no is %d, sec_no is %d\n", sub_no, sec_no);
if (sec_no != sub_number) {
err("there're more buses behind this bridge. Hot removal is not supported. Please choose another card\n");
return -ENODEV;
}
bus = ibmphp_find_res_bus(sec_number);
if (!bus) {
err("cannot find Bus structure for the bridged device\n");
return -EINVAL;
}
debug("bus->busno is %x\n", bus->busno);
debug("sec_number is %x\n", sec_number);
ibmphp_remove_bus(bus, busno);
for (count = 0; address[count]; count++) {
/* for 2 BARs */
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, address[count], &start_address);
if (!start_address) {
/* This BAR is not implemented */
continue;
}
tmp_address = start_address;
if (start_address & PCI_BASE_ADDRESS_SPACE_IO) {
/* This is IO */
start_address &= PCI_BASE_ADDRESS_IO_MASK;
if (ibmphp_find_resource(bus, start_address, &io, IO) < 0) {
err("cannot find corresponding IO resource to remove\n");
return -EIO;
}
if (io)
debug("io->start = %x\n", io->start);
ibmphp_remove_resource(io);
/* ????????? DO WE NEED TO WRITE ANYTHING INTO THE PCI CONFIG SPACE BACK ?????????? */
} else {
/* This is Memory */
if (start_address & PCI_BASE_ADDRESS_MEM_PREFETCH) {
/* pfmem */
start_address &= PCI_BASE_ADDRESS_MEM_MASK;
if (ibmphp_find_resource(bus, start_address, &pfmem, PFMEM) < 0) {
err("cannot find corresponding PFMEM resource to remove\n");
return -EINVAL;
}
if (pfmem) {
debug("pfmem->start = %x\n", pfmem->start);
ibmphp_remove_resource(pfmem);
}
} else {
/* regular memory */
start_address &= PCI_BASE_ADDRESS_MEM_MASK;
if (ibmphp_find_resource(bus, start_address, &mem, MEM) < 0) {
err("cannot find corresponding MEM resource to remove\n");
return -EINVAL;
}
if (mem) {
debug("mem->start = %x\n", mem->start);
ibmphp_remove_resource(mem);
}
}
if (tmp_address & PCI_BASE_ADDRESS_MEM_TYPE_64) {
/* takes up another dword */
count += 1;
}
} /* end of mem */
} /* end of for */
debug("%s - exiting, returning success\n", __func__);
return 0;
}
static int unconfigure_boot_card(struct slot *slot_cur)
{
u16 vendor_id;
u32 class;
u8 hdr_type;
u8 device;
u8 busno;
u8 function;
int rc;
unsigned int devfn;
u8 valid_device = 0x00; /* To see if we are ever able to find valid device and read it */
debug("%s - enter\n", __func__);
device = slot_cur->device;
busno = slot_cur->bus;
debug("b4 for loop, device is %x\n", device);
/* For every function on the card */
for (function = 0x0; function < 0x08; function++) {
devfn = PCI_DEVFN(device, function);
ibmphp_pci_bus->number = busno;
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_VENDOR_ID, &vendor_id);
if (vendor_id != PCI_VENDOR_ID_NOTVALID) {
/* found correct device!!! */
++valid_device;
debug("%s - found correct device\n", __func__);
/* header: x x x x x x x x
* | |___________|=> 1=PPB bridge, 0=normal device, 2=CardBus Bridge
* |_=> 0 = single function device, 1 = multi-function device
*/
pci_bus_read_config_byte(ibmphp_pci_bus, devfn, PCI_HEADER_TYPE, &hdr_type);
pci_bus_read_config_dword(ibmphp_pci_bus, devfn, PCI_CLASS_REVISION, &class);
debug("hdr_type %x, class %x\n", hdr_type, class);
class >>= 8; /* to take revision out, class = class.subclass.prog i/f */
if (class == PCI_CLASS_NOT_DEFINED_VGA) {
err("The device %x function %x is VGA compatible and is not supported for hot removing. Please choose another device.\n", device, function);
return -ENODEV;
} else if (class == PCI_CLASS_DISPLAY_VGA) {
err("The device %x function %x is not supported for hot removing. Please choose another device.\n", device, function);
return -ENODEV;
}
switch (hdr_type) {
case PCI_HEADER_TYPE_NORMAL:
rc = unconfigure_boot_device(busno, device, function);
if (rc) {
err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
device, function, busno);
return rc;
}
function = 0x8;
break;
case PCI_HEADER_TYPE_MULTIDEVICE:
rc = unconfigure_boot_device(busno, device, function);
if (rc) {
err("was not able to unconfigure device %x func %x on bus %x. bailing out...\n",
device, function, busno);
return rc;
}
break;
case PCI_HEADER_TYPE_BRIDGE:
class >>= 8;
if (class != PCI_CLASS_BRIDGE_PCI) {
err("This device %x function %x is not PCI-to-PCI bridge, and is not supported for hot-removing. Please try another card.\n", device, function);
return -ENODEV;
}
rc = unconfigure_boot_bridge(busno, device, function);
if (rc != 0) {
err("was not able to hot-remove PPB properly.\n");
return rc;
}
function = 0x8;
break;
case PCI_HEADER_TYPE_MULTIBRIDGE:
class >>= 8;
if (class != PCI_CLASS_BRIDGE_PCI) {
err("This device %x function %x is not PCI-to-PCI bridge, and is not supported for hot-removing. Please try another card.\n", device, function);
return -ENODEV;
}
rc = unconfigure_boot_bridge(busno, device, function);
if (rc != 0) {
err("was not able to hot-remove PPB properly.\n");
return rc;
}
break;
default:
err("MAJOR PROBLEM!!!! Cannot read device's header\n");
return -1;
} /* end of switch */
} /* end of valid device */
} /* end of for */
if (!valid_device) {
err("Could not find device to unconfigure. Or could not read the card.\n");
return -1;
}
return 0;
}
/*
* free the resources of the card (multi, single, or bridged)
* Parameters: slot, flag to say if this is for removing entire module or just
* unconfiguring the device
* TO DO: will probably need to add some code in case there was some resource,
* to remove it... this is from when we have errors in the configure_card...
* !!!!!!!!!!!!!!!!!!!!!!!!!FOR BUSES!!!!!!!!!!!!
* Returns: 0, -1, -ENODEV
*/
int ibmphp_unconfigure_card(struct slot **slot_cur, int the_end)
{
int i;
int count;
int rc;
struct slot *sl = *slot_cur;
struct pci_func *cur_func = NULL;
struct pci_func *temp_func;
debug("%s - enter\n", __func__);
if (!the_end) {
/* Need to unconfigure the card */
rc = unconfigure_boot_card(sl);
if ((rc == -ENODEV) || (rc == -EIO) || (rc == -EINVAL)) {
/* In all other cases, will still need to get rid of func structure if it exists */
return rc;
}
}
if (sl->func) {
cur_func = sl->func;
while (cur_func) {
/* TO DO: WILL MOST LIKELY NEED TO GET RID OF THE BUS STRUCTURE FROM RESOURCES AS WELL */
if (cur_func->bus) {
/* in other words, it's a PPB */
count = 2;
} else {
count = 6;
}
for (i = 0; i < count; i++) {
if (cur_func->io[i]) {
debug("io[%d] exists\n", i);
if (the_end > 0)
ibmphp_remove_resource(cur_func->io[i]);
cur_func->io[i] = NULL;
}
if (cur_func->mem[i]) {
debug("mem[%d] exists\n", i);
if (the_end > 0)
ibmphp_remove_resource(cur_func->mem[i]);
cur_func->mem[i] = NULL;
}
if (cur_func->pfmem[i]) {
debug("pfmem[%d] exists\n", i);
if (the_end > 0)
ibmphp_remove_resource(cur_func->pfmem[i]);
cur_func->pfmem[i] = NULL;
}
}
temp_func = cur_func->next;
kfree(cur_func);
cur_func = temp_func;
}
}
sl->func = NULL;
*slot_cur = sl;
debug("%s - exit\n", __func__);
return 0;
}
/*
* add a new bus resulting from hot-plugging a PPB bridge with devices
*
* Input: bus and the amount of resources needed (we know we can assign those,
* since they've been checked already
* Output: bus added to the correct spot
* 0, -1, error
*/
static int add_new_bus(struct bus_node *bus, struct resource_node *io, struct resource_node *mem, struct resource_node *pfmem, u8 parent_busno)
{
struct range_node *io_range = NULL;
struct range_node *mem_range = NULL;
struct range_node *pfmem_range = NULL;
struct bus_node *cur_bus = NULL;
/* Trying to find the parent bus number */
if (parent_busno != 0xFF) {
cur_bus = ibmphp_find_res_bus(parent_busno);
if (!cur_bus) {
err("strange, cannot find bus which is supposed to be at the system... something is terribly wrong...\n");
return -ENODEV;
}
list_add(&bus->bus_list, &cur_bus->bus_list);
}
if (io) {
io_range = kzalloc(sizeof(*io_range), GFP_KERNEL);
if (!io_range)
return -ENOMEM;
io_range->start = io->start;
io_range->end = io->end;
io_range->rangeno = 1;
bus->noIORanges = 1;
bus->rangeIO = io_range;
}
if (mem) {
mem_range = kzalloc(sizeof(*mem_range), GFP_KERNEL);
if (!mem_range)
return -ENOMEM;
mem_range->start = mem->start;
mem_range->end = mem->end;
mem_range->rangeno = 1;
bus->noMemRanges = 1;
bus->rangeMem = mem_range;
}
if (pfmem) {
pfmem_range = kzalloc(sizeof(*pfmem_range), GFP_KERNEL);
if (!pfmem_range)
return -ENOMEM;
pfmem_range->start = pfmem->start;
pfmem_range->end = pfmem->end;
pfmem_range->rangeno = 1;
bus->noPFMemRanges = 1;
bus->rangePFMem = pfmem_range;
}
return 0;
}
/*
* find the 1st available bus number for PPB to set as its secondary bus
* Parameters: bus_number of the primary bus
* Returns: bus_number of the secondary bus or 0xff in case of failure
*/
static u8 find_sec_number(u8 primary_busno, u8 slotno)
{
int min, max;
u8 busno;
struct bus_info *bus;
struct bus_node *bus_cur;
bus = ibmphp_find_same_bus_num(primary_busno);
if (!bus) {
err("cannot get slot range of the bus from the BIOS\n");
return 0xff;
}
max = bus->slot_max;
min = bus->slot_min;
if ((slotno > max) || (slotno < min)) {
err("got the wrong range\n");
return 0xff;
}
busno = (u8) (slotno - (u8) min);
busno += primary_busno + 0x01;
bus_cur = ibmphp_find_res_bus(busno);
/* either there is no such bus number, or there are no ranges, which
* can only happen if we removed the bridged device in previous load
* of the driver, and now only have the skeleton bus struct
*/
if ((!bus_cur) || (!(bus_cur->rangeIO) && !(bus_cur->rangeMem) && !(bus_cur->rangePFMem)))
return busno;
return 0xff;
}