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linux/drivers/pci/hotplug/cpqphp_core.c
Julia Lawall 83d0571073 PCI: hotplug: ensure a consistent return value in error case 
Typically, the return value desired for the failure of a function with an
integer return value is a negative integer.  In these cases, the return
value is sometimes a negative integer and sometimes 0, due to a subsequent
initialization of the return variable within the loop.

A simplified version of the semantic match that finds this problem is:
(http://coccinelle.lip6.fr/)

//<smpl>
@r exists@
identifier ret;
position p;
constant C;
expression e1,e3,e4;
statement S;
@@

ret = -C
... when != ret = e3
    when any
if@p (...) S
... when any
if (\(ret != 0\|ret < 0\|ret > 0\) || ...) { ... return ...; }
... when != ret = e3
    when any
*if@p (...)
{
  ... when != ret = e4
  return ret;
}
//</smpl>

[bhelgaas: squashed into one patch]
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2012-07-16 09:25:56 -06:00

1471 lines
36 KiB
C
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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>
*
* Jan 12, 2003 - Added 66/100/133MHz PCI-X support,
* Torben Mathiasen <torben.mathiasen@hp.com>
*/
#include <linux/module.h>
#include <linux/moduleparam.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/init.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include "cpqphp.h"
#include "cpqphp_nvram.h"
/* Global variables */
int cpqhp_debug;
int cpqhp_legacy_mode;
struct controller *cpqhp_ctrl_list; /* = NULL */
struct pci_func *cpqhp_slot_list[256];
struct irq_routing_table *cpqhp_routing_table;
/* local variables */
static void __iomem *smbios_table;
static void __iomem *smbios_start;
static void __iomem *cpqhp_rom_start;
static bool power_mode;
static bool debug;
static int initialized;
#define DRIVER_VERSION "0.9.8"
#define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>"
#define DRIVER_DESC "Compaq Hot Plug PCI Controller Driver"
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(power_mode, bool, 0644);
MODULE_PARM_DESC(power_mode, "Power mode enabled or not");
module_param(debug, bool, 0644);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
#define CPQHPC_MODULE_MINOR 208
static inline int is_slot64bit(struct slot *slot)
{
return (readb(slot->p_sm_slot + SMBIOS_SLOT_WIDTH) == 0x06) ? 1 : 0;
}
static inline int is_slot66mhz(struct slot *slot)
{
return (readb(slot->p_sm_slot + SMBIOS_SLOT_TYPE) == 0x0E) ? 1 : 0;
}
/**
* detect_SMBIOS_pointer - find the System Management BIOS Table in mem region.
* @begin: begin pointer for region to be scanned.
* @end: end pointer for region to be scanned.
*
* Returns pointer to the head of the SMBIOS tables (or %NULL).
*/
static void __iomem * detect_SMBIOS_pointer(void __iomem *begin, void __iomem *end)
{
void __iomem *fp;
void __iomem *endp;
u8 temp1, temp2, temp3, temp4;
int status = 0;
endp = (end - sizeof(u32) + 1);
for (fp = begin; fp <= endp; fp += 16) {
temp1 = readb(fp);
temp2 = readb(fp+1);
temp3 = readb(fp+2);
temp4 = readb(fp+3);
if (temp1 == '_' &&
temp2 == 'S' &&
temp3 == 'M' &&
temp4 == '_') {
status = 1;
break;
}
}
if (!status)
fp = NULL;
dbg("Discovered SMBIOS Entry point at %p\n", fp);
return fp;
}
/**
* init_SERR - Initializes the per slot SERR generation.
* @ctrl: controller to use
*
* For unexpected switch opens
*/
static int init_SERR(struct controller * ctrl)
{
u32 tempdword;
u32 number_of_slots;
u8 physical_slot;
if (!ctrl)
return 1;
tempdword = ctrl->first_slot;
number_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0F;
/* Loop through slots */
while (number_of_slots) {
physical_slot = tempdword;
writeb(0, ctrl->hpc_reg + SLOT_SERR);
tempdword++;
number_of_slots--;
}
return 0;
}
static int init_cpqhp_routing_table(void)
{
int len;
cpqhp_routing_table = pcibios_get_irq_routing_table();
if (cpqhp_routing_table == NULL)
return -ENOMEM;
len = cpqhp_routing_table_length();
if (len == 0) {
kfree(cpqhp_routing_table);
cpqhp_routing_table = NULL;
return -1;
}
return 0;
}
/* nice debugging output */
static void pci_print_IRQ_route(void)
{
int len;
int loop;
u8 tbus, tdevice, tslot;
len = cpqhp_routing_table_length();
dbg("bus dev func slot\n");
for (loop = 0; loop < len; ++loop) {
tbus = cpqhp_routing_table->slots[loop].bus;
tdevice = cpqhp_routing_table->slots[loop].devfn;
tslot = cpqhp_routing_table->slots[loop].slot;
dbg("%d %d %d %d\n", tbus, tdevice >> 3, tdevice & 0x7, tslot);
}
return;
}
/**
* get_subsequent_smbios_entry: get the next entry from bios table.
* @smbios_start: where to start in the SMBIOS table
* @smbios_table: location of the SMBIOS table
* @curr: %NULL or pointer to previously returned structure
*
* Gets the first entry if previous == NULL;
* otherwise, returns the next entry.
* Uses global SMBIOS Table pointer.
*
* Returns a pointer to an SMBIOS structure or NULL if none found.
*/
static void __iomem *get_subsequent_smbios_entry(void __iomem *smbios_start,
void __iomem *smbios_table,
void __iomem *curr)
{
u8 bail = 0;
u8 previous_byte = 1;
void __iomem *p_temp;
void __iomem *p_max;
if (!smbios_table || !curr)
return NULL;
/* set p_max to the end of the table */
p_max = smbios_start + readw(smbios_table + ST_LENGTH);
p_temp = curr;
p_temp += readb(curr + SMBIOS_GENERIC_LENGTH);
while ((p_temp < p_max) && !bail) {
/* Look for the double NULL terminator
* The first condition is the previous byte
* and the second is the curr
*/
if (!previous_byte && !(readb(p_temp)))
bail = 1;
previous_byte = readb(p_temp);
p_temp++;
}
if (p_temp < p_max)
return p_temp;
else
return NULL;
}
/**
* get_SMBIOS_entry - return the requested SMBIOS entry or %NULL
* @smbios_start: where to start in the SMBIOS table
* @smbios_table: location of the SMBIOS table
* @type: SMBIOS structure type to be returned
* @previous: %NULL or pointer to previously returned structure
*
* Gets the first entry of the specified type if previous == %NULL;
* Otherwise, returns the next entry of the given type.
* Uses global SMBIOS Table pointer.
* Uses get_subsequent_smbios_entry.
*
* Returns a pointer to an SMBIOS structure or %NULL if none found.
*/
static void __iomem *get_SMBIOS_entry(void __iomem *smbios_start,
void __iomem *smbios_table,
u8 type,
void __iomem *previous)
{
if (!smbios_table)
return NULL;
if (!previous)
previous = smbios_start;
else
previous = get_subsequent_smbios_entry(smbios_start,
smbios_table, previous);
while (previous)
if (readb(previous + SMBIOS_GENERIC_TYPE) != type)
previous = get_subsequent_smbios_entry(smbios_start,
smbios_table, previous);
else
break;
return previous;
}
static void release_slot(struct hotplug_slot *hotplug_slot)
{
struct slot *slot = hotplug_slot->private;
dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
kfree(slot->hotplug_slot->info);
kfree(slot->hotplug_slot);
kfree(slot);
}
static int ctrl_slot_cleanup (struct controller * ctrl)
{
struct slot *old_slot, *next_slot;
old_slot = ctrl->slot;
ctrl->slot = NULL;
while (old_slot) {
/* memory will be freed by the release_slot callback */
next_slot = old_slot->next;
pci_hp_deregister (old_slot->hotplug_slot);
old_slot = next_slot;
}
cpqhp_remove_debugfs_files(ctrl);
/* Free IRQ associated with hot plug device */
free_irq(ctrl->interrupt, ctrl);
/* Unmap the memory */
iounmap(ctrl->hpc_reg);
/* Finally reclaim PCI mem */
release_mem_region(pci_resource_start(ctrl->pci_dev, 0),
pci_resource_len(ctrl->pci_dev, 0));
return 0;
}
/**
* get_slot_mapping - determine logical slot mapping for PCI device
*
* Won't work for more than one PCI-PCI bridge in a slot.
*
* @bus_num - bus number of PCI device
* @dev_num - device number of PCI device
* @slot - Pointer to u8 where slot number will be returned
*
* Output: SUCCESS or FAILURE
*/
static int
get_slot_mapping(struct pci_bus *bus, u8 bus_num, u8 dev_num, u8 *slot)
{
u32 work;
long len;
long loop;
u8 tbus, tdevice, tslot, bridgeSlot;
dbg("%s: %p, %d, %d, %p\n", __func__, bus, bus_num, dev_num, slot);
bridgeSlot = 0xFF;
len = cpqhp_routing_table_length();
for (loop = 0; loop < len; ++loop) {
tbus = cpqhp_routing_table->slots[loop].bus;
tdevice = cpqhp_routing_table->slots[loop].devfn >> 3;
tslot = cpqhp_routing_table->slots[loop].slot;
if ((tbus == bus_num) && (tdevice == dev_num)) {
*slot = tslot;
return 0;
} else {
/* Did not get a match on the target PCI device. Check
* if the current IRQ table entry is a PCI-to-PCI
* bridge device. If so, and it's secondary bus
* matches the bus number for the target device, I need
* to save the bridge's slot number. If I can not find
* an entry for the target device, I will have to
* assume it's on the other side of the bridge, and
* assign it the bridge's slot.
*/
bus->number = tbus;
pci_bus_read_config_dword(bus, PCI_DEVFN(tdevice, 0),
PCI_CLASS_REVISION, &work);
if ((work >> 8) == PCI_TO_PCI_BRIDGE_CLASS) {
pci_bus_read_config_dword(bus,
PCI_DEVFN(tdevice, 0),
PCI_PRIMARY_BUS, &work);
// See if bridge's secondary bus matches target bus.
if (((work >> 8) & 0x000000FF) == (long) bus_num)
bridgeSlot = tslot;
}
}
}
/* If we got here, we didn't find an entry in the IRQ mapping table for
* the target PCI device. If we did determine that the target device
* is on the other side of a PCI-to-PCI bridge, return the slot number
* for the bridge.
*/
if (bridgeSlot != 0xFF) {
*slot = bridgeSlot;
return 0;
}
/* Couldn't find an entry in the routing table for this PCI device */
return -1;
}
/**
* cpqhp_set_attention_status - Turns the Amber LED for a slot on or off
* @ctrl: struct controller to use
* @func: PCI device/function info
* @status: LED control flag: 1 = LED on, 0 = LED off
*/
static int
cpqhp_set_attention_status(struct controller *ctrl, struct pci_func *func,
u32 status)
{
u8 hp_slot;
if (func == NULL)
return 1;
hp_slot = func->device - ctrl->slot_device_offset;
/* Wait for exclusive access to hardware */
mutex_lock(&ctrl->crit_sect);
if (status == 1)
amber_LED_on (ctrl, hp_slot);
else if (status == 0)
amber_LED_off (ctrl, hp_slot);
else {
/* Done with exclusive hardware access */
mutex_unlock(&ctrl->crit_sect);
return 1;
}
set_SOGO(ctrl);
/* Wait for SOBS to be unset */
wait_for_ctrl_irq (ctrl);
/* Done with exclusive hardware access */
mutex_unlock(&ctrl->crit_sect);
return 0;
}
/**
* set_attention_status - Turns the Amber LED for a slot on or off
* @hotplug_slot: slot to change LED on
* @status: LED control flag
*/
static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
{
struct pci_func *slot_func;
struct slot *slot = hotplug_slot->private;
struct controller *ctrl = slot->ctrl;
u8 bus;
u8 devfn;
u8 device;
u8 function;
dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
if (cpqhp_get_bus_dev(ctrl, &bus, &devfn, slot->number) == -1)
return -ENODEV;
device = devfn >> 3;
function = devfn & 0x7;
dbg("bus, dev, fn = %d, %d, %d\n", bus, device, function);
slot_func = cpqhp_slot_find(bus, device, function);
if (!slot_func)
return -ENODEV;
return cpqhp_set_attention_status(ctrl, slot_func, status);
}
static int process_SI(struct hotplug_slot *hotplug_slot)
{
struct pci_func *slot_func;
struct slot *slot = hotplug_slot->private;
struct controller *ctrl = slot->ctrl;
u8 bus;
u8 devfn;
u8 device;
u8 function;
dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
if (cpqhp_get_bus_dev(ctrl, &bus, &devfn, slot->number) == -1)
return -ENODEV;
device = devfn >> 3;
function = devfn & 0x7;
dbg("bus, dev, fn = %d, %d, %d\n", bus, device, function);
slot_func = cpqhp_slot_find(bus, device, function);
if (!slot_func)
return -ENODEV;
slot_func->bus = bus;
slot_func->device = device;
slot_func->function = function;
slot_func->configured = 0;
dbg("board_added(%p, %p)\n", slot_func, ctrl);
return cpqhp_process_SI(ctrl, slot_func);
}
static int process_SS(struct hotplug_slot *hotplug_slot)
{
struct pci_func *slot_func;
struct slot *slot = hotplug_slot->private;
struct controller *ctrl = slot->ctrl;
u8 bus;
u8 devfn;
u8 device;
u8 function;
dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
if (cpqhp_get_bus_dev(ctrl, &bus, &devfn, slot->number) == -1)
return -ENODEV;
device = devfn >> 3;
function = devfn & 0x7;
dbg("bus, dev, fn = %d, %d, %d\n", bus, device, function);
slot_func = cpqhp_slot_find(bus, device, function);
if (!slot_func)
return -ENODEV;
dbg("In %s, slot_func = %p, ctrl = %p\n", __func__, slot_func, ctrl);
return cpqhp_process_SS(ctrl, slot_func);
}
static int hardware_test(struct hotplug_slot *hotplug_slot, u32 value)
{
struct slot *slot = hotplug_slot->private;
struct controller *ctrl = slot->ctrl;
dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
return cpqhp_hardware_test(ctrl, value);
}
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = hotplug_slot->private;
struct controller *ctrl = slot->ctrl;
dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
*value = get_slot_enabled(ctrl, slot);
return 0;
}
static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = hotplug_slot->private;
struct controller *ctrl = slot->ctrl;
dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
*value = cpq_get_attention_status(ctrl, slot);
return 0;
}
static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = hotplug_slot->private;
struct controller *ctrl = slot->ctrl;
dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
*value = cpq_get_latch_status(ctrl, slot);
return 0;
}
static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
struct slot *slot = hotplug_slot->private;
struct controller *ctrl = slot->ctrl;
dbg("%s - physical_slot = %s\n", __func__, slot_name(slot));
*value = get_presence_status(ctrl, slot);
return 0;
}
static struct hotplug_slot_ops cpqphp_hotplug_slot_ops = {
.set_attention_status = set_attention_status,
.enable_slot = process_SI,
.disable_slot = process_SS,
.hardware_test = hardware_test,
.get_power_status = get_power_status,
.get_attention_status = get_attention_status,
.get_latch_status = get_latch_status,
.get_adapter_status = get_adapter_status,
};
#define SLOT_NAME_SIZE 10
static int ctrl_slot_setup(struct controller *ctrl,
void __iomem *smbios_start,
void __iomem *smbios_table)
{
struct slot *slot;
struct hotplug_slot *hotplug_slot;
struct hotplug_slot_info *hotplug_slot_info;
struct pci_bus *bus = ctrl->pci_bus;
u8 number_of_slots;
u8 slot_device;
u8 slot_number;
u8 ctrl_slot;
u32 tempdword;
char name[SLOT_NAME_SIZE];
void __iomem *slot_entry= NULL;
int result;
dbg("%s\n", __func__);
tempdword = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
number_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0F;
slot_device = readb(ctrl->hpc_reg + SLOT_MASK) >> 4;
slot_number = ctrl->first_slot;
while (number_of_slots) {
slot = kzalloc(sizeof(*slot), GFP_KERNEL);
if (!slot) {
result = -ENOMEM;
goto error;
}
slot->hotplug_slot = kzalloc(sizeof(*(slot->hotplug_slot)),
GFP_KERNEL);
if (!slot->hotplug_slot) {
result = -ENOMEM;
goto error_slot;
}
hotplug_slot = slot->hotplug_slot;
hotplug_slot->info = kzalloc(sizeof(*(hotplug_slot->info)),
GFP_KERNEL);
if (!hotplug_slot->info) {
result = -ENOMEM;
goto error_hpslot;
}
hotplug_slot_info = hotplug_slot->info;
slot->ctrl = ctrl;
slot->bus = ctrl->bus;
slot->device = slot_device;
slot->number = slot_number;
dbg("slot->number = %u\n", slot->number);
slot_entry = get_SMBIOS_entry(smbios_start, smbios_table, 9,
slot_entry);
while (slot_entry && (readw(slot_entry + SMBIOS_SLOT_NUMBER) !=
slot->number)) {
slot_entry = get_SMBIOS_entry(smbios_start,
smbios_table, 9, slot_entry);
}
slot->p_sm_slot = slot_entry;
init_timer(&slot->task_event);
slot->task_event.expires = jiffies + 5 * HZ;
slot->task_event.function = cpqhp_pushbutton_thread;
/*FIXME: these capabilities aren't used but if they are
* they need to be correctly implemented
*/
slot->capabilities |= PCISLOT_REPLACE_SUPPORTED;
slot->capabilities |= PCISLOT_INTERLOCK_SUPPORTED;
if (is_slot64bit(slot))
slot->capabilities |= PCISLOT_64_BIT_SUPPORTED;
if (is_slot66mhz(slot))
slot->capabilities |= PCISLOT_66_MHZ_SUPPORTED;
if (bus->cur_bus_speed == PCI_SPEED_66MHz)
slot->capabilities |= PCISLOT_66_MHZ_OPERATION;
ctrl_slot =
slot_device - (readb(ctrl->hpc_reg + SLOT_MASK) >> 4);
/* Check presence */
slot->capabilities |=
((((~tempdword) >> 23) |
((~tempdword) >> 15)) >> ctrl_slot) & 0x02;
/* Check the switch state */
slot->capabilities |=
((~tempdword & 0xFF) >> ctrl_slot) & 0x01;
/* Check the slot enable */
slot->capabilities |=
((read_slot_enable(ctrl) << 2) >> ctrl_slot) & 0x04;
/* register this slot with the hotplug pci core */
hotplug_slot->release = &release_slot;
hotplug_slot->private = slot;
snprintf(name, SLOT_NAME_SIZE, "%u", slot->number);
hotplug_slot->ops = &cpqphp_hotplug_slot_ops;
hotplug_slot_info->power_status = get_slot_enabled(ctrl, slot);
hotplug_slot_info->attention_status =
cpq_get_attention_status(ctrl, slot);
hotplug_slot_info->latch_status =
cpq_get_latch_status(ctrl, slot);
hotplug_slot_info->adapter_status =
get_presence_status(ctrl, slot);
dbg("registering bus %d, dev %d, number %d, "
"ctrl->slot_device_offset %d, slot %d\n",
slot->bus, slot->device,
slot->number, ctrl->slot_device_offset,
slot_number);
result = pci_hp_register(hotplug_slot,
ctrl->pci_dev->bus,
slot->device,
name);
if (result) {
err("pci_hp_register failed with error %d\n", result);
goto error_info;
}
slot->next = ctrl->slot;
ctrl->slot = slot;
number_of_slots--;
slot_device++;
slot_number++;
}
return 0;
error_info:
kfree(hotplug_slot_info);
error_hpslot:
kfree(hotplug_slot);
error_slot:
kfree(slot);
error:
return result;
}
static int one_time_init(void)
{
int loop;
int retval = 0;
if (initialized)
return 0;
power_mode = 0;
retval = init_cpqhp_routing_table();
if (retval)
goto error;
if (cpqhp_debug)
pci_print_IRQ_route();
dbg("Initialize + Start the notification mechanism \n");
retval = cpqhp_event_start_thread();
if (retval)
goto error;
dbg("Initialize slot lists\n");
for (loop = 0; loop < 256; loop++)
cpqhp_slot_list[loop] = NULL;
/* FIXME: We also need to hook the NMI handler eventually.
* this also needs to be worked with Christoph
* register_NMI_handler();
*/
/* Map rom address */
cpqhp_rom_start = ioremap(ROM_PHY_ADDR, ROM_PHY_LEN);
if (!cpqhp_rom_start) {
err ("Could not ioremap memory region for ROM\n");
retval = -EIO;
goto error;
}
/* Now, map the int15 entry point if we are on compaq specific
* hardware
*/
compaq_nvram_init(cpqhp_rom_start);
/* Map smbios table entry point structure */
smbios_table = detect_SMBIOS_pointer(cpqhp_rom_start,
cpqhp_rom_start + ROM_PHY_LEN);
if (!smbios_table) {
err ("Could not find the SMBIOS pointer in memory\n");
retval = -EIO;
goto error_rom_start;
}
smbios_start = ioremap(readl(smbios_table + ST_ADDRESS),
readw(smbios_table + ST_LENGTH));
if (!smbios_start) {
err ("Could not ioremap memory region taken from SMBIOS values\n");
retval = -EIO;
goto error_smbios_start;
}
initialized = 1;
return retval;
error_smbios_start:
iounmap(smbios_start);
error_rom_start:
iounmap(cpqhp_rom_start);
error:
return retval;
}
static int cpqhpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
u8 num_of_slots = 0;
u8 hp_slot = 0;
u8 device;
u8 bus_cap;
u16 temp_word;
u16 vendor_id;
u16 subsystem_vid;
u16 subsystem_deviceid;
u32 rc;
struct controller *ctrl;
struct pci_func *func;
struct pci_bus *bus;
int err;
err = pci_enable_device(pdev);
if (err) {
printk(KERN_ERR MY_NAME ": cannot enable PCI device %s (%d)\n",
pci_name(pdev), err);
return err;
}
bus = pdev->subordinate;
if (!bus) {
dev_notice(&pdev->dev, "the device is not a bridge, "
"skipping\n");
rc = -ENODEV;
goto err_disable_device;
}
/* Need to read VID early b/c it's used to differentiate CPQ and INTC
* discovery
*/
vendor_id = pdev->vendor;
if ((vendor_id != PCI_VENDOR_ID_COMPAQ) &&
(vendor_id != PCI_VENDOR_ID_INTEL)) {
err(msg_HPC_non_compaq_or_intel);
rc = -ENODEV;
goto err_disable_device;
}
dbg("Vendor ID: %x\n", vendor_id);
dbg("revision: %d\n", pdev->revision);
if ((vendor_id == PCI_VENDOR_ID_COMPAQ) && (!pdev->revision)) {
err(msg_HPC_rev_error);
rc = -ENODEV;
goto err_disable_device;
}
/* Check for the proper subsystem ID's
* Intel uses a different SSID programming model than Compaq.
* For Intel, each SSID bit identifies a PHP capability.
* Also Intel HPC's may have RID=0.
*/
if ((pdev->revision <= 2) && (vendor_id != PCI_VENDOR_ID_INTEL)) {
err(msg_HPC_not_supported);
return -ENODEV;
}
/* TODO: This code can be made to support non-Compaq or Intel
* subsystem IDs
*/
subsystem_vid = pdev->subsystem_vendor;
dbg("Subsystem Vendor ID: %x\n", subsystem_vid);
if ((subsystem_vid != PCI_VENDOR_ID_COMPAQ) && (subsystem_vid != PCI_VENDOR_ID_INTEL)) {
err(msg_HPC_non_compaq_or_intel);
rc = -ENODEV;
goto err_disable_device;
}
ctrl = kzalloc(sizeof(struct controller), GFP_KERNEL);
if (!ctrl) {
err("%s : out of memory\n", __func__);
rc = -ENOMEM;
goto err_disable_device;
}
subsystem_deviceid = pdev->subsystem_device;
info("Hot Plug Subsystem Device ID: %x\n", subsystem_deviceid);
/* Set Vendor ID, so it can be accessed later from other
* functions
*/
ctrl->vendor_id = vendor_id;
switch (subsystem_vid) {
case PCI_VENDOR_ID_COMPAQ:
if (pdev->revision >= 0x13) { /* CIOBX */
ctrl->push_flag = 1;
ctrl->slot_switch_type = 1;
ctrl->push_button = 1;
ctrl->pci_config_space = 1;
ctrl->defeature_PHP = 1;
ctrl->pcix_support = 1;
ctrl->pcix_speed_capability = 1;
pci_read_config_byte(pdev, 0x41, &bus_cap);
if (bus_cap & 0x80) {
dbg("bus max supports 133MHz PCI-X\n");
bus->max_bus_speed = PCI_SPEED_133MHz_PCIX;
break;
}
if (bus_cap & 0x40) {
dbg("bus max supports 100MHz PCI-X\n");
bus->max_bus_speed = PCI_SPEED_100MHz_PCIX;
break;
}
if (bus_cap & 20) {
dbg("bus max supports 66MHz PCI-X\n");
bus->max_bus_speed = PCI_SPEED_66MHz_PCIX;
break;
}
if (bus_cap & 10) {
dbg("bus max supports 66MHz PCI\n");
bus->max_bus_speed = PCI_SPEED_66MHz;
break;
}
break;
}
switch (subsystem_deviceid) {
case PCI_SUB_HPC_ID:
/* Original 6500/7000 implementation */
ctrl->slot_switch_type = 1;
bus->max_bus_speed = PCI_SPEED_33MHz;
ctrl->push_button = 0;
ctrl->pci_config_space = 1;
ctrl->defeature_PHP = 1;
ctrl->pcix_support = 0;
ctrl->pcix_speed_capability = 0;
break;
case PCI_SUB_HPC_ID2:
/* First Pushbutton implementation */
ctrl->push_flag = 1;
ctrl->slot_switch_type = 1;
bus->max_bus_speed = PCI_SPEED_33MHz;
ctrl->push_button = 1;
ctrl->pci_config_space = 1;
ctrl->defeature_PHP = 1;
ctrl->pcix_support = 0;
ctrl->pcix_speed_capability = 0;
break;
case PCI_SUB_HPC_ID_INTC:
/* Third party (6500/7000) */
ctrl->slot_switch_type = 1;
bus->max_bus_speed = PCI_SPEED_33MHz;
ctrl->push_button = 0;
ctrl->pci_config_space = 1;
ctrl->defeature_PHP = 1;
ctrl->pcix_support = 0;
ctrl->pcix_speed_capability = 0;
break;
case PCI_SUB_HPC_ID3:
/* First 66 Mhz implementation */
ctrl->push_flag = 1;
ctrl->slot_switch_type = 1;
bus->max_bus_speed = PCI_SPEED_66MHz;
ctrl->push_button = 1;
ctrl->pci_config_space = 1;
ctrl->defeature_PHP = 1;
ctrl->pcix_support = 0;
ctrl->pcix_speed_capability = 0;
break;
case PCI_SUB_HPC_ID4:
/* First PCI-X implementation, 100MHz */
ctrl->push_flag = 1;
ctrl->slot_switch_type = 1;
bus->max_bus_speed = PCI_SPEED_100MHz_PCIX;
ctrl->push_button = 1;
ctrl->pci_config_space = 1;
ctrl->defeature_PHP = 1;
ctrl->pcix_support = 1;
ctrl->pcix_speed_capability = 0;
break;
default:
err(msg_HPC_not_supported);
rc = -ENODEV;
goto err_free_ctrl;
}
break;
case PCI_VENDOR_ID_INTEL:
/* Check for speed capability (0=33, 1=66) */
if (subsystem_deviceid & 0x0001)
bus->max_bus_speed = PCI_SPEED_66MHz;
else
bus->max_bus_speed = PCI_SPEED_33MHz;
/* Check for push button */
if (subsystem_deviceid & 0x0002)
ctrl->push_button = 0;
else
ctrl->push_button = 1;
/* Check for slot switch type (0=mechanical, 1=not mechanical) */
if (subsystem_deviceid & 0x0004)
ctrl->slot_switch_type = 0;
else
ctrl->slot_switch_type = 1;
/* PHP Status (0=De-feature PHP, 1=Normal operation) */
if (subsystem_deviceid & 0x0008)
ctrl->defeature_PHP = 1; /* PHP supported */
else
ctrl->defeature_PHP = 0; /* PHP not supported */
/* Alternate Base Address Register Interface
* (0=not supported, 1=supported)
*/
if (subsystem_deviceid & 0x0010)
ctrl->alternate_base_address = 1;
else
ctrl->alternate_base_address = 0;
/* PCI Config Space Index (0=not supported, 1=supported) */
if (subsystem_deviceid & 0x0020)
ctrl->pci_config_space = 1;
else
ctrl->pci_config_space = 0;
/* PCI-X support */
if (subsystem_deviceid & 0x0080) {
ctrl->pcix_support = 1;
if (subsystem_deviceid & 0x0040)
/* 133MHz PCI-X if bit 7 is 1 */
ctrl->pcix_speed_capability = 1;
else
/* 100MHz PCI-X if bit 7 is 1 and bit 0 is 0, */
/* 66MHz PCI-X if bit 7 is 1 and bit 0 is 1 */
ctrl->pcix_speed_capability = 0;
} else {
/* Conventional PCI */
ctrl->pcix_support = 0;
ctrl->pcix_speed_capability = 0;
}
break;
default:
err(msg_HPC_not_supported);
rc = -ENODEV;
goto err_free_ctrl;
}
/* Tell the user that we found one. */
info("Initializing the PCI hot plug controller residing on PCI bus %d\n",
pdev->bus->number);
dbg("Hotplug controller capabilities:\n");
dbg(" speed_capability %d\n", bus->max_bus_speed);
dbg(" slot_switch_type %s\n", ctrl->slot_switch_type ?
"switch present" : "no switch");
dbg(" defeature_PHP %s\n", ctrl->defeature_PHP ?
"PHP supported" : "PHP not supported");
dbg(" alternate_base_address %s\n", ctrl->alternate_base_address ?
"supported" : "not supported");
dbg(" pci_config_space %s\n", ctrl->pci_config_space ?
"supported" : "not supported");
dbg(" pcix_speed_capability %s\n", ctrl->pcix_speed_capability ?
"supported" : "not supported");
dbg(" pcix_support %s\n", ctrl->pcix_support ?
"supported" : "not supported");
ctrl->pci_dev = pdev;
pci_set_drvdata(pdev, ctrl);
/* make our own copy of the pci bus structure,
* as we like tweaking it a lot */
ctrl->pci_bus = kmemdup(pdev->bus, sizeof(*ctrl->pci_bus), GFP_KERNEL);
if (!ctrl->pci_bus) {
err("out of memory\n");
rc = -ENOMEM;
goto err_free_ctrl;
}
ctrl->bus = pdev->bus->number;
ctrl->rev = pdev->revision;
dbg("bus device function rev: %d %d %d %d\n", ctrl->bus,
PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn), ctrl->rev);
mutex_init(&ctrl->crit_sect);
init_waitqueue_head(&ctrl->queue);
/* initialize our threads if they haven't already been started up */
rc = one_time_init();
if (rc) {
goto err_free_bus;
}
dbg("pdev = %p\n", pdev);
dbg("pci resource start %llx\n", (unsigned long long)pci_resource_start(pdev, 0));
dbg("pci resource len %llx\n", (unsigned long long)pci_resource_len(pdev, 0));
if (!request_mem_region(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0), MY_NAME)) {
err("cannot reserve MMIO region\n");
rc = -ENOMEM;
goto err_free_bus;
}
ctrl->hpc_reg = ioremap(pci_resource_start(pdev, 0),
pci_resource_len(pdev, 0));
if (!ctrl->hpc_reg) {
err("cannot remap MMIO region %llx @ %llx\n",
(unsigned long long)pci_resource_len(pdev, 0),
(unsigned long long)pci_resource_start(pdev, 0));
rc = -ENODEV;
goto err_free_mem_region;
}
/* Check for 66Mhz operation */
bus->cur_bus_speed = get_controller_speed(ctrl);
/********************************************************
*
* Save configuration headers for this and
* subordinate PCI buses
*
********************************************************/
/* find the physical slot number of the first hot plug slot */
/* Get slot won't work for devices behind bridges, but
* in this case it will always be called for the "base"
* bus/dev/func of a slot.
* CS: this is leveraging the PCIIRQ routing code from the kernel
* (pci-pc.c: get_irq_routing_table) */
rc = get_slot_mapping(ctrl->pci_bus, pdev->bus->number,
(readb(ctrl->hpc_reg + SLOT_MASK) >> 4),
&(ctrl->first_slot));
dbg("get_slot_mapping: first_slot = %d, returned = %d\n",
ctrl->first_slot, rc);
if (rc) {
err(msg_initialization_err, rc);
goto err_iounmap;
}
/* Store PCI Config Space for all devices on this bus */
rc = cpqhp_save_config(ctrl, ctrl->bus, readb(ctrl->hpc_reg + SLOT_MASK));
if (rc) {
err("%s: unable to save PCI configuration data, error %d\n",
__func__, rc);
goto err_iounmap;
}
/*
* Get IO, memory, and IRQ resources for new devices
*/
/* The next line is required for cpqhp_find_available_resources */
ctrl->interrupt = pdev->irq;
if (ctrl->interrupt < 0x10) {
cpqhp_legacy_mode = 1;
dbg("System seems to be configured for Full Table Mapped MPS mode\n");
}
ctrl->cfgspc_irq = 0;
pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &ctrl->cfgspc_irq);
rc = cpqhp_find_available_resources(ctrl, cpqhp_rom_start);
ctrl->add_support = !rc;
if (rc) {
dbg("cpqhp_find_available_resources = 0x%x\n", rc);
err("unable to locate PCI configuration resources for hot plug add.\n");
goto err_iounmap;
}
/*
* Finish setting up the hot plug ctrl device
*/
ctrl->slot_device_offset = readb(ctrl->hpc_reg + SLOT_MASK) >> 4;
dbg("NumSlots %d \n", ctrl->slot_device_offset);
ctrl->next_event = 0;
/* Setup the slot information structures */
rc = ctrl_slot_setup(ctrl, smbios_start, smbios_table);
if (rc) {
err(msg_initialization_err, 6);
err("%s: unable to save PCI configuration data, error %d\n",
__func__, rc);
goto err_iounmap;
}
/* Mask all general input interrupts */
writel(0xFFFFFFFFL, ctrl->hpc_reg + INT_MASK);
/* set up the interrupt */
dbg("HPC interrupt = %d \n", ctrl->interrupt);
if (request_irq(ctrl->interrupt, cpqhp_ctrl_intr,
IRQF_SHARED, MY_NAME, ctrl)) {
err("Can't get irq %d for the hotplug pci controller\n",
ctrl->interrupt);
rc = -ENODEV;
goto err_iounmap;
}
/* Enable Shift Out interrupt and clear it, also enable SERR on power
* fault
*/
temp_word = readw(ctrl->hpc_reg + MISC);
temp_word |= 0x4006;
writew(temp_word, ctrl->hpc_reg + MISC);
/* Changed 05/05/97 to clear all interrupts at start */
writel(0xFFFFFFFFL, ctrl->hpc_reg + INT_INPUT_CLEAR);
ctrl->ctrl_int_comp = readl(ctrl->hpc_reg + INT_INPUT_CLEAR);
writel(0x0L, ctrl->hpc_reg + INT_MASK);
if (!cpqhp_ctrl_list) {
cpqhp_ctrl_list = ctrl;
ctrl->next = NULL;
} else {
ctrl->next = cpqhp_ctrl_list;
cpqhp_ctrl_list = ctrl;
}
/* turn off empty slots here unless command line option "ON" set
* Wait for exclusive access to hardware
*/
mutex_lock(&ctrl->crit_sect);
num_of_slots = readb(ctrl->hpc_reg + SLOT_MASK) & 0x0F;
/* find first device number for the ctrl */
device = readb(ctrl->hpc_reg + SLOT_MASK) >> 4;
while (num_of_slots) {
dbg("num_of_slots: %d\n", num_of_slots);
func = cpqhp_slot_find(ctrl->bus, device, 0);
if (!func)
break;
hp_slot = func->device - ctrl->slot_device_offset;
dbg("hp_slot: %d\n", hp_slot);
/* We have to save the presence info for these slots */
temp_word = ctrl->ctrl_int_comp >> 16;
func->presence_save = (temp_word >> hp_slot) & 0x01;
func->presence_save |= (temp_word >> (hp_slot + 7)) & 0x02;
if (ctrl->ctrl_int_comp & (0x1L << hp_slot))
func->switch_save = 0;
else
func->switch_save = 0x10;
if (!power_mode)
if (!func->is_a_board) {
green_LED_off(ctrl, hp_slot);
slot_disable(ctrl, hp_slot);
}
device++;
num_of_slots--;
}
if (!power_mode) {
set_SOGO(ctrl);
/* Wait for SOBS to be unset */
wait_for_ctrl_irq(ctrl);
}
rc = init_SERR(ctrl);
if (rc) {
err("init_SERR failed\n");
mutex_unlock(&ctrl->crit_sect);
goto err_free_irq;
}
/* Done with exclusive hardware access */
mutex_unlock(&ctrl->crit_sect);
cpqhp_create_debugfs_files(ctrl);
return 0;
err_free_irq:
free_irq(ctrl->interrupt, ctrl);
err_iounmap:
iounmap(ctrl->hpc_reg);
err_free_mem_region:
release_mem_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
err_free_bus:
kfree(ctrl->pci_bus);
err_free_ctrl:
kfree(ctrl);
err_disable_device:
pci_disable_device(pdev);
return rc;
}
static void __exit unload_cpqphpd(void)
{
struct pci_func *next;
struct pci_func *TempSlot;
int loop;
u32 rc;
struct controller *ctrl;
struct controller *tctrl;
struct pci_resource *res;
struct pci_resource *tres;
rc = compaq_nvram_store(cpqhp_rom_start);
ctrl = cpqhp_ctrl_list;
while (ctrl) {
if (ctrl->hpc_reg) {
u16 misc;
rc = read_slot_enable (ctrl);
writeb(0, ctrl->hpc_reg + SLOT_SERR);
writel(0xFFFFFFC0L | ~rc, ctrl->hpc_reg + INT_MASK);
misc = readw(ctrl->hpc_reg + MISC);
misc &= 0xFFFD;
writew(misc, ctrl->hpc_reg + MISC);
}
ctrl_slot_cleanup(ctrl);
res = ctrl->io_head;
while (res) {
tres = res;
res = res->next;
kfree(tres);
}
res = ctrl->mem_head;
while (res) {
tres = res;
res = res->next;
kfree(tres);
}
res = ctrl->p_mem_head;
while (res) {
tres = res;
res = res->next;
kfree(tres);
}
res = ctrl->bus_head;
while (res) {
tres = res;
res = res->next;
kfree(tres);
}
kfree (ctrl->pci_bus);
tctrl = ctrl;
ctrl = ctrl->next;
kfree(tctrl);
}
for (loop = 0; loop < 256; loop++) {
next = cpqhp_slot_list[loop];
while (next != NULL) {
res = next->io_head;
while (res) {
tres = res;
res = res->next;
kfree(tres);
}
res = next->mem_head;
while (res) {
tres = res;
res = res->next;
kfree(tres);
}
res = next->p_mem_head;
while (res) {
tres = res;
res = res->next;
kfree(tres);
}
res = next->bus_head;
while (res) {
tres = res;
res = res->next;
kfree(tres);
}
TempSlot = next;
next = next->next;
kfree(TempSlot);
}
}
/* Stop the notification mechanism */
if (initialized)
cpqhp_event_stop_thread();
/* unmap the rom address */
if (cpqhp_rom_start)
iounmap(cpqhp_rom_start);
if (smbios_start)
iounmap(smbios_start);
}
static struct pci_device_id hpcd_pci_tbl[] = {
{
/* handle any PCI Hotplug controller */
.class = ((PCI_CLASS_SYSTEM_PCI_HOTPLUG << 8) | 0x00),
.class_mask = ~0,
/* no matter who makes it */
.vendor = PCI_ANY_ID,
.device = PCI_ANY_ID,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
}, { /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, hpcd_pci_tbl);
static struct pci_driver cpqhpc_driver = {
.name = "compaq_pci_hotplug",
.id_table = hpcd_pci_tbl,
.probe = cpqhpc_probe,
/* remove: cpqhpc_remove_one, */
};
static int __init cpqhpc_init(void)
{
int result;
cpqhp_debug = debug;
info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
cpqhp_initialize_debugfs();
result = pci_register_driver(&cpqhpc_driver);
dbg("pci_register_driver = %d\n", result);
return result;
}
static void __exit cpqhpc_cleanup(void)
{
dbg("unload_cpqphpd()\n");
unload_cpqphpd();
dbg("pci_unregister_driver\n");
pci_unregister_driver(&cpqhpc_driver);
cpqhp_shutdown_debugfs();
}
module_init(cpqhpc_init);
module_exit(cpqhpc_cleanup);
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