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android_kernel_xiaomi_sm8350/drivers/pci/hotplug/cpci_hotplug_pci.c
Scott Murray 43b7d7cfb1 [PATCH] PCI Hotplug: CPCI update 
[PATCH] CPCI: update

I have finally done some work to update the CompactPCI hotplug driver to
fix some of the outstanding issues in 2.6:
- Added adapter and latch status ops so that those files will get created
  by the current PCI hotplug core.  This used to not be required, but
  seems to be now after some of the sysfs rework in the core.
- Replaced slot list spinlock with a r/w semaphore to avoid any potential
  issues with sleeping.  This quiets all of the runtime warnings.
- Reworked interrupt driven hot extraction handling to remove need for a
  polling operator for ENUM# status.  There are a lot of boards that only
  have an interrupt driven by ENUM#, so this lowers the bar to entry.
- Replaced pci_visit_dev usage with better use of the PCI core functions.
  The new code is functionally equivalent to the previous code, but the
  use of pci_enable_device on insert needs to be investigated further, as
  I need to do some more testing to see if it is still necessary.

Signed-off-by: Scott Murray <scottm@somanetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-05-17 14:31:11 -07:00

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/*
* CompactPCI Hot Plug Driver PCI functions
*
* Copyright (C) 2002 by SOMA Networks, Inc.
*
* 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 <scottm@somanetworks.com>
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/proc_fs.h>
#include "../pci.h"
#include "pci_hotplug.h"
#include "cpci_hotplug.h"
#define MY_NAME "cpci_hotplug"
extern int cpci_debug;
#define dbg(format, arg...) \
do { \
if(cpci_debug) \
printk (KERN_DEBUG "%s: " format "\n", \
MY_NAME , ## arg); \
} while(0)
#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME , ## arg)
#define ROUND_UP(x, a) (((x) + (a) - 1) & ~((a) - 1))
u8 cpci_get_attention_status(struct slot* slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if(!hs_cap) {
return 0;
}
if(pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr)) {
return 0;
}
return hs_csr & 0x0008 ? 1 : 0;
}
int cpci_set_attention_status(struct slot* slot, int status)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if(!hs_cap) {
return 0;
}
if(pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr)) {
return 0;
}
if(status) {
hs_csr |= HS_CSR_LOO;
} else {
hs_csr &= ~HS_CSR_LOO;
}
if(pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr)) {
return 0;
}
return 1;
}
u16 cpci_get_hs_csr(struct slot* slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if(!hs_cap) {
return 0xFFFF;
}
if(pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr)) {
return 0xFFFF;
}
return hs_csr;
}
int cpci_check_and_clear_ins(struct slot* slot)
{
int hs_cap;
u16 hs_csr;
int ins = 0;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if(!hs_cap) {
return 0;
}
if(pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr)) {
return 0;
}
if(hs_csr & HS_CSR_INS) {
/* Clear INS (by setting it) */
if(pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr)) {
ins = 0;
}
ins = 1;
}
return ins;
}
int cpci_check_ext(struct slot* slot)
{
int hs_cap;
u16 hs_csr;
int ext = 0;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if(!hs_cap) {
return 0;
}
if(pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr)) {
return 0;
}
if(hs_csr & HS_CSR_EXT) {
ext = 1;
}
return ext;
}
int cpci_clear_ext(struct slot* slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if(!hs_cap) {
return -ENODEV;
}
if(pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr)) {
return -ENODEV;
}
if(hs_csr & HS_CSR_EXT) {
/* Clear EXT (by setting it) */
if(pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr)) {
return -ENODEV;
}
}
return 0;
}
int cpci_led_on(struct slot* slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if(!hs_cap) {
return -ENODEV;
}
if(pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr)) {
return -ENODEV;
}
if((hs_csr & HS_CSR_LOO) != HS_CSR_LOO) {
hs_csr |= HS_CSR_LOO;
if(pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr)) {
err("Could not set LOO for slot %s",
slot->hotplug_slot->name);
return -ENODEV;
}
}
return 0;
}
int cpci_led_off(struct slot* slot)
{
int hs_cap;
u16 hs_csr;
hs_cap = pci_bus_find_capability(slot->bus,
slot->devfn,
PCI_CAP_ID_CHSWP);
if(!hs_cap) {
return -ENODEV;
}
if(pci_bus_read_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
&hs_csr)) {
return -ENODEV;
}
if(hs_csr & HS_CSR_LOO) {
hs_csr &= ~HS_CSR_LOO;
if(pci_bus_write_config_word(slot->bus,
slot->devfn,
hs_cap + 2,
hs_csr)) {
err("Could not clear LOO for slot %s",
slot->hotplug_slot->name);
return -ENODEV;
}
}
return 0;
}
/*
* Device configuration functions
*/
static void cpci_enable_device(struct pci_dev *dev)
{
struct pci_bus *bus;
pci_enable_device(dev);
if(dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
bus = dev->subordinate;
list_for_each_entry(dev, &bus->devices, bus_list) {
cpci_enable_device(dev);
}
}
}
int cpci_configure_slot(struct slot* slot)
{
unsigned char busnr;
struct pci_bus *child;
dbg("%s - enter", __FUNCTION__);
if(slot->dev == NULL) {
dbg("pci_dev null, finding %02x:%02x:%x",
slot->bus->number, PCI_SLOT(slot->devfn), PCI_FUNC(slot->devfn));
slot->dev = pci_find_slot(slot->bus->number, slot->devfn);
}
/* Still NULL? Well then scan for it! */
if(slot->dev == NULL) {
int n;
dbg("pci_dev still null");
/*
* This will generate pci_dev structures for all functions, but
* we will only call this case when lookup fails.
*/
n = pci_scan_slot(slot->bus, slot->devfn);
dbg("%s: pci_scan_slot returned %d", __FUNCTION__, n);
if(n > 0)
pci_bus_add_devices(slot->bus);
slot->dev = pci_find_slot(slot->bus->number, slot->devfn);
if(slot->dev == NULL) {
err("Could not find PCI device for slot %02x", slot->number);
return 1;
}
}
if (slot->dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
pci_read_config_byte(slot->dev, PCI_SECONDARY_BUS, &busnr);
child = pci_add_new_bus(slot->dev->bus, slot->dev, busnr);
pci_do_scan_bus(child);
pci_bus_size_bridges(child);
}
pci_bus_assign_resources(slot->dev->bus);
cpci_enable_device(slot->dev);
dbg("%s - exit", __FUNCTION__);
return 0;
}
int cpci_unconfigure_slot(struct slot* slot)
{
int i;
struct pci_dev *dev;
dbg("%s - enter", __FUNCTION__);
if(!slot->dev) {
err("No device for slot %02x\n", slot->number);
return -ENODEV;
}
for (i = 0; i < 8; i++) {
dev = pci_find_slot(slot->bus->number,
PCI_DEVFN(PCI_SLOT(slot->devfn), i));
if(dev) {
pci_remove_bus_device(dev);
slot->dev = NULL;
}
}
dbg("%s - exit", __FUNCTION__);
return 0;
}
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