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linux-zen-server/drivers/pci/hotplug/ibmphp_core.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* IBM Hot Plug Controller Driver
*
* Written By: Chuck Cole, Jyoti Shah, Tong Yu, Irene Zubarev, IBM Corporation
*
* Copyright (C) 2001,2003 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2001-2003 IBM Corp.
*
* All rights reserved.
*
* Send feedback to <gregkh@us.ibm.com>
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include "../pci.h"
#include <asm/pci_x86.h> /* for struct irq_routing_table */
#include <asm/io_apic.h>
#include "ibmphp.h"
#define attn_on(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNON)
#define attn_off(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_ATTNOFF)
#define attn_LED_blink(sl) ibmphp_hpc_writeslot(sl, HPC_SLOT_BLINKLED)
#define get_ctrl_revision(sl, rev) ibmphp_hpc_readslot(sl, READ_REVLEVEL, rev)
#define get_hpc_options(sl, opt) ibmphp_hpc_readslot(sl, READ_HPCOPTIONS, opt)
#define DRIVER_VERSION "0.6"
#define DRIVER_DESC "IBM Hot Plug PCI Controller Driver"
int ibmphp_debug;
static bool debug;
module_param(debug, bool, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRIVER_DESC);
struct pci_bus *ibmphp_pci_bus;
static int max_slots;
static int irqs[16]; /* PIC mode IRQs we're using so far (in case MPS
* tables don't provide default info for empty slots */
static int init_flag;
static inline int get_cur_bus_info(struct slot **sl)
{
int rc = 1;
struct slot *slot_cur = *sl;
debug("options = %x\n", slot_cur->ctrl->options);
debug("revision = %x\n", slot_cur->ctrl->revision);
if (READ_BUS_STATUS(slot_cur->ctrl))
rc = ibmphp_hpc_readslot(slot_cur, READ_BUSSTATUS, NULL);
if (rc)
return rc;
slot_cur->bus_on->current_speed = CURRENT_BUS_SPEED(slot_cur->busstatus);
if (READ_BUS_MODE(slot_cur->ctrl))
slot_cur->bus_on->current_bus_mode =
CURRENT_BUS_MODE(slot_cur->busstatus);
else
slot_cur->bus_on->current_bus_mode = 0xFF;
debug("busstatus = %x, bus_speed = %x, bus_mode = %x\n",
slot_cur->busstatus,
slot_cur->bus_on->current_speed,
slot_cur->bus_on->current_bus_mode);
*sl = slot_cur;
return 0;
}
static inline int slot_update(struct slot **sl)
{
int rc;
rc = ibmphp_hpc_readslot(*sl, READ_ALLSTAT, NULL);
if (rc)
return rc;
if (!init_flag)
rc = get_cur_bus_info(sl);
return rc;
}
static int __init get_max_slots(void)
{
struct slot *slot_cur;
u8 slot_count = 0;
list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
/* sometimes the hot-pluggable slots start with 4 (not always from 1) */
slot_count = max(slot_count, slot_cur->number);
}
return slot_count;
}
/* This routine will put the correct slot->device information per slot. It's
* called from initialization of the slot structures. It will also assign
* interrupt numbers per each slot.
* Parameters: struct slot
* Returns 0 or errors
*/
int ibmphp_init_devno(struct slot **cur_slot)
{
struct irq_routing_table *rtable;
int len;
int loop;
int i;
rtable = pcibios_get_irq_routing_table();
if (!rtable) {
err("no BIOS routing table...\n");
return -ENOMEM;
}
len = (rtable->size - sizeof(struct irq_routing_table)) /
sizeof(struct irq_info);
if (!len) {
kfree(rtable);
return -1;
}
for (loop = 0; loop < len; loop++) {
if ((*cur_slot)->number == rtable->slots[loop].slot &&
(*cur_slot)->bus == rtable->slots[loop].bus) {
(*cur_slot)->device = PCI_SLOT(rtable->slots[loop].devfn);
for (i = 0; i < 4; i++)
(*cur_slot)->irq[i] = IO_APIC_get_PCI_irq_vector((int) (*cur_slot)->bus,
(int) (*cur_slot)->device, i);
debug("(*cur_slot)->irq[0] = %x\n",
(*cur_slot)->irq[0]);
debug("(*cur_slot)->irq[1] = %x\n",
(*cur_slot)->irq[1]);
debug("(*cur_slot)->irq[2] = %x\n",
(*cur_slot)->irq[2]);
debug("(*cur_slot)->irq[3] = %x\n",
(*cur_slot)->irq[3]);
debug("rtable->exclusive_irqs = %x\n",
rtable->exclusive_irqs);
debug("rtable->slots[loop].irq[0].bitmap = %x\n",
rtable->slots[loop].irq[0].bitmap);
debug("rtable->slots[loop].irq[1].bitmap = %x\n",
rtable->slots[loop].irq[1].bitmap);
debug("rtable->slots[loop].irq[2].bitmap = %x\n",
rtable->slots[loop].irq[2].bitmap);
debug("rtable->slots[loop].irq[3].bitmap = %x\n",
rtable->slots[loop].irq[3].bitmap);
debug("rtable->slots[loop].irq[0].link = %x\n",
rtable->slots[loop].irq[0].link);
debug("rtable->slots[loop].irq[1].link = %x\n",
rtable->slots[loop].irq[1].link);
debug("rtable->slots[loop].irq[2].link = %x\n",
rtable->slots[loop].irq[2].link);
debug("rtable->slots[loop].irq[3].link = %x\n",
rtable->slots[loop].irq[3].link);
debug("end of init_devno\n");
kfree(rtable);
return 0;
}
}
kfree(rtable);
return -1;
}
static inline int power_on(struct slot *slot_cur)
{
u8 cmd = HPC_SLOT_ON;
int retval;
retval = ibmphp_hpc_writeslot(slot_cur, cmd);
if (retval) {
err("power on failed\n");
return retval;
}
if (CTLR_RESULT(slot_cur->ctrl->status)) {
err("command not completed successfully in power_on\n");
return -EIO;
}
msleep(3000); /* For ServeRAID cards, and some 66 PCI */
return 0;
}
static inline int power_off(struct slot *slot_cur)
{
u8 cmd = HPC_SLOT_OFF;
int retval;
retval = ibmphp_hpc_writeslot(slot_cur, cmd);
if (retval) {
err("power off failed\n");
return retval;
}
if (CTLR_RESULT(slot_cur->ctrl->status)) {
err("command not completed successfully in power_off\n");
retval = -EIO;
}
return retval;
}
static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 value)
{
int rc = 0;
struct slot *pslot;
u8 cmd = 0x00; /* avoid compiler warning */
debug("set_attention_status - Entry hotplug_slot[%lx] value[%x]\n",
(ulong) hotplug_slot, value);
ibmphp_lock_operations();
if (hotplug_slot) {
switch (value) {
case HPC_SLOT_ATTN_OFF:
cmd = HPC_SLOT_ATTNOFF;
break;
case HPC_SLOT_ATTN_ON:
cmd = HPC_SLOT_ATTNON;
break;
case HPC_SLOT_ATTN_BLINK:
cmd = HPC_SLOT_BLINKLED;
break;
default:
rc = -ENODEV;
err("set_attention_status - Error : invalid input [%x]\n",
value);
break;
}
if (rc == 0) {
pslot = to_slot(hotplug_slot);
rc = ibmphp_hpc_writeslot(pslot, cmd);
}
} else
rc = -ENODEV;
ibmphp_unlock_operations();
debug("set_attention_status - Exit rc[%d]\n", rc);
return rc;
}
static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
int rc = -ENODEV;
struct slot *pslot;
struct slot myslot;
debug("get_attention_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
(ulong) hotplug_slot, (ulong) value);
ibmphp_lock_operations();
if (hotplug_slot) {
pslot = to_slot(hotplug_slot);
memcpy(&myslot, pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
&myslot.status);
if (!rc)
rc = ibmphp_hpc_readslot(pslot, READ_EXTSLOTSTATUS,
&myslot.ext_status);
if (!rc)
*value = SLOT_ATTN(myslot.status, myslot.ext_status);
}
ibmphp_unlock_operations();
debug("get_attention_status - Exit rc[%d] value[%x]\n", rc, *value);
return rc;
}
static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
int rc = -ENODEV;
struct slot *pslot;
struct slot myslot;
debug("get_latch_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
(ulong) hotplug_slot, (ulong) value);
ibmphp_lock_operations();
if (hotplug_slot) {
pslot = to_slot(hotplug_slot);
memcpy(&myslot, pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
&myslot.status);
if (!rc)
*value = SLOT_LATCH(myslot.status);
}
ibmphp_unlock_operations();
debug("get_latch_status - Exit rc[%d] rc[%x] value[%x]\n",
rc, rc, *value);
return rc;
}
static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
int rc = -ENODEV;
struct slot *pslot;
struct slot myslot;
debug("get_power_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
(ulong) hotplug_slot, (ulong) value);
ibmphp_lock_operations();
if (hotplug_slot) {
pslot = to_slot(hotplug_slot);
memcpy(&myslot, pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
&myslot.status);
if (!rc)
*value = SLOT_PWRGD(myslot.status);
}
ibmphp_unlock_operations();
debug("get_power_status - Exit rc[%d] rc[%x] value[%x]\n",
rc, rc, *value);
return rc;
}
static int get_adapter_present(struct hotplug_slot *hotplug_slot, u8 *value)
{
int rc = -ENODEV;
struct slot *pslot;
u8 present;
struct slot myslot;
debug("get_adapter_status - Entry hotplug_slot[%lx] pvalue[%lx]\n",
(ulong) hotplug_slot, (ulong) value);
ibmphp_lock_operations();
if (hotplug_slot) {
pslot = to_slot(hotplug_slot);
memcpy(&myslot, pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS,
&myslot.status);
if (!rc) {
present = SLOT_PRESENT(myslot.status);
if (present == HPC_SLOT_EMPTY)
*value = 0;
else
*value = 1;
}
}
ibmphp_unlock_operations();
debug("get_adapter_present - Exit rc[%d] value[%x]\n", rc, *value);
return rc;
}
static int get_max_bus_speed(struct slot *slot)
{
int rc = 0;
u8 mode = 0;
enum pci_bus_speed speed;
struct pci_bus *bus = slot->hotplug_slot.pci_slot->bus;
debug("%s - Entry slot[%p]\n", __func__, slot);
ibmphp_lock_operations();
mode = slot->supported_bus_mode;
speed = slot->supported_speed;
ibmphp_unlock_operations();
switch (speed) {
case BUS_SPEED_33:
break;
case BUS_SPEED_66:
if (mode == BUS_MODE_PCIX)
speed += 0x01;
break;
case BUS_SPEED_100:
case BUS_SPEED_133:
speed += 0x01;
break;
default:
/* Note (will need to change): there would be soon 256, 512 also */
rc = -ENODEV;
}
if (!rc)
bus->max_bus_speed = speed;
debug("%s - Exit rc[%d] speed[%x]\n", __func__, rc, speed);
return rc;
}
/****************************************************************************
* This routine will initialize the ops data structure used in the validate
* function. It will also power off empty slots that are powered on since BIOS
* leaves those on, albeit disconnected
****************************************************************************/
static int __init init_ops(void)
{
struct slot *slot_cur;
int retval;
int rc;
list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
debug("BEFORE GETTING SLOT STATUS, slot # %x\n",
slot_cur->number);
if (slot_cur->ctrl->revision == 0xFF)
if (get_ctrl_revision(slot_cur,
&slot_cur->ctrl->revision))
return -1;
if (slot_cur->bus_on->current_speed == 0xFF)
if (get_cur_bus_info(&slot_cur))
return -1;
get_max_bus_speed(slot_cur);
if (slot_cur->ctrl->options == 0xFF)
if (get_hpc_options(slot_cur, &slot_cur->ctrl->options))
return -1;
retval = slot_update(&slot_cur);
if (retval)
return retval;
debug("status = %x\n", slot_cur->status);
debug("ext_status = %x\n", slot_cur->ext_status);
debug("SLOT_POWER = %x\n", SLOT_POWER(slot_cur->status));
debug("SLOT_PRESENT = %x\n", SLOT_PRESENT(slot_cur->status));
debug("SLOT_LATCH = %x\n", SLOT_LATCH(slot_cur->status));
if ((SLOT_PWRGD(slot_cur->status)) &&
!(SLOT_PRESENT(slot_cur->status)) &&
!(SLOT_LATCH(slot_cur->status))) {
debug("BEFORE POWER OFF COMMAND\n");
rc = power_off(slot_cur);
if (rc)
return rc;
/* retval = slot_update(&slot_cur);
* if (retval)
* return retval;
* ibmphp_update_slot_info(slot_cur);
*/
}
}
init_flag = 0;
return 0;
}
/* This operation will check whether the slot is within the bounds and
* the operation is valid to perform on that slot
* Parameters: slot, operation
* Returns: 0 or error codes
*/
static int validate(struct slot *slot_cur, int opn)
{
int number;
int retval;
if (!slot_cur)
return -ENODEV;
number = slot_cur->number;
if ((number > max_slots) || (number < 0))
return -EBADSLT;
debug("slot_number in validate is %d\n", slot_cur->number);
retval = slot_update(&slot_cur);
if (retval)
return retval;
switch (opn) {
case ENABLE:
if (!(SLOT_PWRGD(slot_cur->status)) &&
(SLOT_PRESENT(slot_cur->status)) &&
!(SLOT_LATCH(slot_cur->status)))
return 0;
break;
case DISABLE:
if ((SLOT_PWRGD(slot_cur->status)) &&
(SLOT_PRESENT(slot_cur->status)) &&
!(SLOT_LATCH(slot_cur->status)))
return 0;
break;
default:
break;
}
err("validate failed....\n");
return -EINVAL;
}
/****************************************************************************
* This routine is for updating the data structures in the hotplug core
* Parameters: struct slot
* Returns: 0 or error
****************************************************************************/
int ibmphp_update_slot_info(struct slot *slot_cur)
{
struct pci_bus *bus = slot_cur->hotplug_slot.pci_slot->bus;
u8 bus_speed;
u8 mode;
bus_speed = slot_cur->bus_on->current_speed;
mode = slot_cur->bus_on->current_bus_mode;
switch (bus_speed) {
case BUS_SPEED_33:
break;
case BUS_SPEED_66:
if (mode == BUS_MODE_PCIX)
bus_speed += 0x01;
else if (mode == BUS_MODE_PCI)
;
else
bus_speed = PCI_SPEED_UNKNOWN;
break;
case BUS_SPEED_100:
case BUS_SPEED_133:
bus_speed += 0x01;
break;
default:
bus_speed = PCI_SPEED_UNKNOWN;
}
bus->cur_bus_speed = bus_speed;
// To do: bus_names
return 0;
}
/******************************************************************************
* This function will return the pci_func, given bus and devfunc, or NULL. It
* is called from visit routines
******************************************************************************/
static struct pci_func *ibm_slot_find(u8 busno, u8 device, u8 function)
{
struct pci_func *func_cur;
struct slot *slot_cur;
list_for_each_entry(slot_cur, &ibmphp_slot_head, ibm_slot_list) {
if (slot_cur->func) {
func_cur = slot_cur->func;
while (func_cur) {
if ((func_cur->busno == busno) &&
(func_cur->device == device) &&
(func_cur->function == function))
return func_cur;
func_cur = func_cur->next;
}
}
}
return NULL;
}
/*************************************************************
* This routine frees up memory used by struct slot, including
* the pointers to pci_func, bus, hotplug_slot, controller,
* and deregistering from the hotplug core
*************************************************************/
static void free_slots(void)
{
struct slot *slot_cur, *next;
debug("%s -- enter\n", __func__);
list_for_each_entry_safe(slot_cur, next, &ibmphp_slot_head,
ibm_slot_list) {
pci_hp_del(&slot_cur->hotplug_slot);
slot_cur->ctrl = NULL;
slot_cur->bus_on = NULL;
/*
* We don't want to actually remove the resources,
* since ibmphp_free_resources() will do just that.
*/
ibmphp_unconfigure_card(&slot_cur, -1);
pci_hp_destroy(&slot_cur->hotplug_slot);
kfree(slot_cur);
}
debug("%s -- exit\n", __func__);
}
static void ibm_unconfigure_device(struct pci_func *func)
{
struct pci_dev *temp;
u8 j;
debug("inside %s\n", __func__);
debug("func->device = %x, func->function = %x\n",
func->device, func->function);
debug("func->device << 3 | 0x0 = %x\n", func->device << 3 | 0x0);
pci_lock_rescan_remove();
for (j = 0; j < 0x08; j++) {
temp = pci_get_domain_bus_and_slot(0, func->busno,
(func->device << 3) | j);
if (temp) {
pci_stop_and_remove_bus_device(temp);
pci_dev_put(temp);
}
}
pci_dev_put(func->dev);
pci_unlock_rescan_remove();
}
/*
* The following function is to fix kernel bug regarding
* getting bus entries, here we manually add those primary
* bus entries to kernel bus structure whenever apply
*/
static u8 bus_structure_fixup(u8 busno)
{
struct pci_bus *bus, *b;
struct pci_dev *dev;
u16 l;
if (pci_find_bus(0, busno) || !(ibmphp_find_same_bus_num(busno)))
return 1;
bus = kmalloc(sizeof(*bus), GFP_KERNEL);
if (!bus)
return 1;
dev = kmalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
kfree(bus);
return 1;
}
bus->number = busno;
bus->ops = ibmphp_pci_bus->ops;
dev->bus = bus;
for (dev->devfn = 0; dev->devfn < 256; dev->devfn += 8) {
if (!pci_read_config_word(dev, PCI_VENDOR_ID, &l) &&
(l != 0x0000) && (l != 0xffff)) {
debug("%s - Inside bus_structure_fixup()\n",
__func__);
b = pci_scan_bus(busno, ibmphp_pci_bus->ops, NULL);
if (!b)
continue;
pci_bus_add_devices(b);
break;
}
}
kfree(dev);
kfree(bus);
return 0;
}
static int ibm_configure_device(struct pci_func *func)
{
struct pci_bus *child;
int num;
int flag = 0; /* this is to make sure we don't double scan the bus,
for bridged devices primarily */
pci_lock_rescan_remove();
if (!(bus_structure_fixup(func->busno)))
flag = 1;
if (func->dev == NULL)
func->dev = pci_get_domain_bus_and_slot(0, func->busno,
PCI_DEVFN(func->device, func->function));
if (func->dev == NULL) {
struct pci_bus *bus = pci_find_bus(0, func->busno);
if (!bus)
goto out;
num = pci_scan_slot(bus,
PCI_DEVFN(func->device, func->function));
if (num)
pci_bus_add_devices(bus);
func->dev = pci_get_domain_bus_and_slot(0, func->busno,
PCI_DEVFN(func->device, func->function));
if (func->dev == NULL) {
err("ERROR... : pci_dev still NULL\n");
goto out;
}
}
if (!(flag) && (func->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)) {
pci_hp_add_bridge(func->dev);
child = func->dev->subordinate;
if (child)
pci_bus_add_devices(child);
}
out:
pci_unlock_rescan_remove();
return 0;
}
/*******************************************************
* Returns whether the bus is empty or not
*******************************************************/
static int is_bus_empty(struct slot *slot_cur)
{
int rc;
struct slot *tmp_slot;
u8 i = slot_cur->bus_on->slot_min;
while (i <= slot_cur->bus_on->slot_max) {
if (i == slot_cur->number) {
i++;
continue;
}
tmp_slot = ibmphp_get_slot_from_physical_num(i);
if (!tmp_slot)
return 0;
rc = slot_update(&tmp_slot);
if (rc)
return 0;
if (SLOT_PRESENT(tmp_slot->status) &&
SLOT_PWRGD(tmp_slot->status))
return 0;
i++;
}
return 1;
}
/***********************************************************
* If the HPC permits and the bus currently empty, tries to set the
* bus speed and mode at the maximum card and bus capability
* Parameters: slot
* Returns: bus is set (0) or error code
***********************************************************/
static int set_bus(struct slot *slot_cur)
{
int rc;
u8 speed;
u8 cmd = 0x0;
int retval;
static const struct pci_device_id ciobx[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, 0x0101) },
{ },
};
debug("%s - entry slot # %d\n", __func__, slot_cur->number);
if (SET_BUS_STATUS(slot_cur->ctrl) && is_bus_empty(slot_cur)) {
rc = slot_update(&slot_cur);
if (rc)
return rc;
speed = SLOT_SPEED(slot_cur->ext_status);
debug("ext_status = %x, speed = %x\n", slot_cur->ext_status, speed);
switch (speed) {
case HPC_SLOT_SPEED_33:
cmd = HPC_BUS_33CONVMODE;
break;
case HPC_SLOT_SPEED_66:
if (SLOT_PCIX(slot_cur->ext_status)) {
if ((slot_cur->supported_speed >= BUS_SPEED_66) &&
(slot_cur->supported_bus_mode == BUS_MODE_PCIX))
cmd = HPC_BUS_66PCIXMODE;
else if (!SLOT_BUS_MODE(slot_cur->ext_status))
/* if max slot/bus capability is 66 pci
and there's no bus mode mismatch, then
the adapter supports 66 pci */
cmd = HPC_BUS_66CONVMODE;
else
cmd = HPC_BUS_33CONVMODE;
} else {
if (slot_cur->supported_speed >= BUS_SPEED_66)
cmd = HPC_BUS_66CONVMODE;
else
cmd = HPC_BUS_33CONVMODE;
}
break;
case HPC_SLOT_SPEED_133:
switch (slot_cur->supported_speed) {
case BUS_SPEED_33:
cmd = HPC_BUS_33CONVMODE;
break;
case BUS_SPEED_66:
if (slot_cur->supported_bus_mode == BUS_MODE_PCIX)
cmd = HPC_BUS_66PCIXMODE;
else
cmd = HPC_BUS_66CONVMODE;
break;
case BUS_SPEED_100:
cmd = HPC_BUS_100PCIXMODE;
break;
case BUS_SPEED_133:
/* This is to take care of the bug in CIOBX chip */
if (pci_dev_present(ciobx))
ibmphp_hpc_writeslot(slot_cur,
HPC_BUS_100PCIXMODE);
cmd = HPC_BUS_133PCIXMODE;
break;
default:
err("Wrong bus speed\n");
return -ENODEV;
}
break;
default:
err("wrong slot speed\n");
return -ENODEV;
}
debug("setting bus speed for slot %d, cmd %x\n",
slot_cur->number, cmd);
retval = ibmphp_hpc_writeslot(slot_cur, cmd);
if (retval) {
err("setting bus speed failed\n");
return retval;
}
if (CTLR_RESULT(slot_cur->ctrl->status)) {
err("command not completed successfully in set_bus\n");
return -EIO;
}
}
/* This is for x440, once Brandon fixes the firmware,
will not need this delay */
msleep(1000);
debug("%s -Exit\n", __func__);
return 0;
}
/* This routine checks the bus limitations that the slot is on from the BIOS.
* This is used in deciding whether or not to power up the slot.
* (electrical/spec limitations. For example, >1 133 MHz or >2 66 PCI cards on
* same bus)
* Parameters: slot
* Returns: 0 = no limitations, -EINVAL = exceeded limitations on the bus
*/
static int check_limitations(struct slot *slot_cur)
{
u8 i;
struct slot *tmp_slot;
u8 count = 0;
u8 limitation = 0;
for (i = slot_cur->bus_on->slot_min; i <= slot_cur->bus_on->slot_max; i++) {
tmp_slot = ibmphp_get_slot_from_physical_num(i);
if (!tmp_slot)
return -ENODEV;
if ((SLOT_PWRGD(tmp_slot->status)) &&
!(SLOT_CONNECT(tmp_slot->status)))
count++;
}
get_cur_bus_info(&slot_cur);
switch (slot_cur->bus_on->current_speed) {
case BUS_SPEED_33:
limitation = slot_cur->bus_on->slots_at_33_conv;
break;
case BUS_SPEED_66:
if (slot_cur->bus_on->current_bus_mode == BUS_MODE_PCIX)
limitation = slot_cur->bus_on->slots_at_66_pcix;
else
limitation = slot_cur->bus_on->slots_at_66_conv;
break;
case BUS_SPEED_100:
limitation = slot_cur->bus_on->slots_at_100_pcix;
break;
case BUS_SPEED_133:
limitation = slot_cur->bus_on->slots_at_133_pcix;
break;
}
if ((count + 1) > limitation)
return -EINVAL;
return 0;
}
static inline void print_card_capability(struct slot *slot_cur)
{
info("capability of the card is ");
if ((slot_cur->ext_status & CARD_INFO) == PCIX133)
info(" 133 MHz PCI-X\n");
else if ((slot_cur->ext_status & CARD_INFO) == PCIX66)
info(" 66 MHz PCI-X\n");
else if ((slot_cur->ext_status & CARD_INFO) == PCI66)
info(" 66 MHz PCI\n");
else
info(" 33 MHz PCI\n");
}
/* This routine will power on the slot, configure the device(s) and find the
* drivers for them.
* Parameters: hotplug_slot
* Returns: 0 or failure codes
*/
static int enable_slot(struct hotplug_slot *hs)
{
int rc, i, rcpr;
struct slot *slot_cur;
u8 function;
struct pci_func *tmp_func;
ibmphp_lock_operations();
debug("ENABLING SLOT........\n");
slot_cur = to_slot(hs);
rc = validate(slot_cur, ENABLE);
if (rc) {
err("validate function failed\n");
goto error_nopower;
}
attn_LED_blink(slot_cur);
rc = set_bus(slot_cur);
if (rc) {
err("was not able to set the bus\n");
goto error_nopower;
}
/*-----------------debugging------------------------------*/
get_cur_bus_info(&slot_cur);
debug("the current bus speed right after set_bus = %x\n",
slot_cur->bus_on->current_speed);
/*----------------------------------------------------------*/
rc = check_limitations(slot_cur);
if (rc) {
err("Adding this card exceeds the limitations of this bus.\n");
err("(i.e., >1 133MHz cards running on same bus, or >2 66 PCI cards running on same bus.\n");
err("Try hot-adding into another bus\n");
rc = -EINVAL;
goto error_nopower;
}
rc = power_on(slot_cur);
if (rc) {
err("something wrong when powering up... please see below for details\n");
/* need to turn off before on, otherwise, blinking overwrites */
attn_off(slot_cur);
attn_on(slot_cur);
if (slot_update(&slot_cur)) {
attn_off(slot_cur);
attn_on(slot_cur);
rc = -ENODEV;
goto exit;
}
/* Check to see the error of why it failed */
if ((SLOT_POWER(slot_cur->status)) &&
!(SLOT_PWRGD(slot_cur->status)))
err("power fault occurred trying to power up\n");
else if (SLOT_BUS_SPEED(slot_cur->status)) {
err("bus speed mismatch occurred. please check current bus speed and card capability\n");
print_card_capability(slot_cur);
} else if (SLOT_BUS_MODE(slot_cur->ext_status)) {
err("bus mode mismatch occurred. please check current bus mode and card capability\n");
print_card_capability(slot_cur);
}
ibmphp_update_slot_info(slot_cur);
goto exit;
}
debug("after power_on\n");
/*-----------------------debugging---------------------------*/
get_cur_bus_info(&slot_cur);
debug("the current bus speed right after power_on = %x\n",
slot_cur->bus_on->current_speed);
/*----------------------------------------------------------*/
rc = slot_update(&slot_cur);
if (rc)
goto error_power;
rc = -EINVAL;
if (SLOT_POWER(slot_cur->status) && !(SLOT_PWRGD(slot_cur->status))) {
err("power fault occurred trying to power up...\n");
goto error_power;
}
if (SLOT_POWER(slot_cur->status) && (SLOT_BUS_SPEED(slot_cur->status))) {
err("bus speed mismatch occurred. please check current bus speed and card capability\n");
print_card_capability(slot_cur);
goto error_power;
}
/* Don't think this case will happen after above checks...
* but just in case, for paranoia sake */
if (!(SLOT_POWER(slot_cur->status))) {
err("power on failed...\n");
goto error_power;
}
slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
if (!slot_cur->func) {
/* do update_slot_info here? */
rc = -ENOMEM;
goto error_power;
}
slot_cur->func->busno = slot_cur->bus;
slot_cur->func->device = slot_cur->device;
for (i = 0; i < 4; i++)
slot_cur->func->irq[i] = slot_cur->irq[i];
debug("b4 configure_card, slot_cur->bus = %x, slot_cur->device = %x\n",
slot_cur->bus, slot_cur->device);
if (ibmphp_configure_card(slot_cur->func, slot_cur->number)) {
err("configure_card was unsuccessful...\n");
/* true because don't need to actually deallocate resources,
* just remove references */
ibmphp_unconfigure_card(&slot_cur, 1);
debug("after unconfigure_card\n");
slot_cur->func = NULL;
rc = -ENOMEM;
goto error_power;
}
function = 0x00;
do {
tmp_func = ibm_slot_find(slot_cur->bus, slot_cur->func->device,
function++);
if (tmp_func && !(tmp_func->dev))
ibm_configure_device(tmp_func);
} while (tmp_func);
attn_off(slot_cur);
if (slot_update(&slot_cur)) {
rc = -EFAULT;
goto exit;
}
ibmphp_print_test();
rc = ibmphp_update_slot_info(slot_cur);
exit:
ibmphp_unlock_operations();
return rc;
error_nopower:
attn_off(slot_cur); /* need to turn off if was blinking b4 */
attn_on(slot_cur);
error_cont:
rcpr = slot_update(&slot_cur);
if (rcpr) {
rc = rcpr;
goto exit;
}
ibmphp_update_slot_info(slot_cur);
goto exit;
error_power:
attn_off(slot_cur); /* need to turn off if was blinking b4 */
attn_on(slot_cur);
rcpr = power_off(slot_cur);
if (rcpr) {
rc = rcpr;
goto exit;
}
goto error_cont;
}
/**************************************************************
* HOT REMOVING ADAPTER CARD *
* INPUT: POINTER TO THE HOTPLUG SLOT STRUCTURE *
* OUTPUT: SUCCESS 0 ; FAILURE: UNCONFIGURE , VALIDATE *
* DISABLE POWER , *
**************************************************************/
static int ibmphp_disable_slot(struct hotplug_slot *hotplug_slot)
{
struct slot *slot = to_slot(hotplug_slot);
int rc;
ibmphp_lock_operations();
rc = ibmphp_do_disable_slot(slot);
ibmphp_unlock_operations();
return rc;
}
int ibmphp_do_disable_slot(struct slot *slot_cur)
{
int rc;
u8 flag;
debug("DISABLING SLOT...\n");
if ((slot_cur == NULL) || (slot_cur->ctrl == NULL))
return -ENODEV;
flag = slot_cur->flag;
slot_cur->flag = 1;
if (flag == 1) {
rc = validate(slot_cur, DISABLE);
/* checking if powered off already & valid slot # */
if (rc)
goto error;
}
attn_LED_blink(slot_cur);
if (slot_cur->func == NULL) {
/* We need this for functions that were there on bootup */
slot_cur->func = kzalloc(sizeof(struct pci_func), GFP_KERNEL);
if (!slot_cur->func) {
rc = -ENOMEM;
goto error;
}
slot_cur->func->busno = slot_cur->bus;
slot_cur->func->device = slot_cur->device;
}
ibm_unconfigure_device(slot_cur->func);
/*
* If we got here from latch suddenly opening on operating card or
* a power fault, there's no power to the card, so cannot
* read from it to determine what resources it occupied. This operation
* is forbidden anyhow. The best we can do is remove it from kernel
* lists at least */
if (!flag) {
attn_off(slot_cur);
return 0;
}
rc = ibmphp_unconfigure_card(&slot_cur, 0);
slot_cur->func = NULL;
debug("in disable_slot. after unconfigure_card\n");
if (rc) {
err("could not unconfigure card.\n");
goto error;
}
rc = ibmphp_hpc_writeslot(slot_cur, HPC_SLOT_OFF);
if (rc)
goto error;
attn_off(slot_cur);
rc = slot_update(&slot_cur);
if (rc)
goto exit;
rc = ibmphp_update_slot_info(slot_cur);
ibmphp_print_test();
exit:
return rc;
error:
/* Need to turn off if was blinking b4 */
attn_off(slot_cur);
attn_on(slot_cur);
if (slot_update(&slot_cur)) {
rc = -EFAULT;
goto exit;
}
if (flag)
ibmphp_update_slot_info(slot_cur);
goto exit;
}
const struct hotplug_slot_ops ibmphp_hotplug_slot_ops = {
.set_attention_status = set_attention_status,
.enable_slot = enable_slot,
.disable_slot = ibmphp_disable_slot,
.hardware_test = NULL,
.get_power_status = get_power_status,
.get_attention_status = get_attention_status,
.get_latch_status = get_latch_status,
.get_adapter_status = get_adapter_present,
};
static void ibmphp_unload(void)
{
free_slots();
debug("after slots\n");
ibmphp_free_resources();
debug("after resources\n");
ibmphp_free_bus_info_queue();
debug("after bus info\n");
ibmphp_free_ebda_hpc_queue();
debug("after ebda hpc\n");
ibmphp_free_ebda_pci_rsrc_queue();
debug("after ebda pci rsrc\n");
kfree(ibmphp_pci_bus);
}
static int __init ibmphp_init(void)
{
struct pci_bus *bus;
int i = 0;
int rc = 0;
init_flag = 1;
info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
ibmphp_pci_bus = kmalloc(sizeof(*ibmphp_pci_bus), GFP_KERNEL);
if (!ibmphp_pci_bus) {
rc = -ENOMEM;
goto exit;
}
bus = pci_find_bus(0, 0);
if (!bus) {
err("Can't find the root pci bus, can not continue\n");
rc = -ENODEV;
goto error;
}
memcpy(ibmphp_pci_bus, bus, sizeof(*ibmphp_pci_bus));
ibmphp_debug = debug;
for (i = 0; i < 16; i++)
irqs[i] = 0;
rc = ibmphp_access_ebda();
if (rc)
goto error;
debug("after ibmphp_access_ebda()\n");
rc = ibmphp_rsrc_init();
if (rc)
goto error;
debug("AFTER Resource & EBDA INITIALIZATIONS\n");
max_slots = get_max_slots();
rc = ibmphp_register_pci();
if (rc)
goto error;
if (init_ops()) {
rc = -ENODEV;
goto error;
}
ibmphp_print_test();
rc = ibmphp_hpc_start_poll_thread();
if (rc)
goto error;
exit:
return rc;
error:
ibmphp_unload();
goto exit;
}
static void __exit ibmphp_exit(void)
{
ibmphp_hpc_stop_poll_thread();
debug("after polling\n");
ibmphp_unload();
debug("done\n");
}
module_init(ibmphp_init);
module_exit(ibmphp_exit);
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