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linuxdebug/drivers/pci/hotplug/ibmphp_hpc.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0+
/*
* IBM Hot Plug Controller Driver
*
* Written By: Jyoti Shah, IBM Corporation
*
* Copyright (C) 2001-2003 IBM Corp.
*
* All rights reserved.
*
* Send feedback to <gregkh@us.ibm.com>
* <jshah@us.ibm.com>
*
*/
#include <linux/wait.h>
#include <linux/time.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include "ibmphp.h"
static int to_debug = 0;
#define debug_polling(fmt, arg...) do { if (to_debug) debug(fmt, arg); } while (0)
//----------------------------------------------------------------------------
// timeout values
//----------------------------------------------------------------------------
#define CMD_COMPLETE_TOUT_SEC 60 // give HPC 60 sec to finish cmd
#define HPC_CTLR_WORKING_TOUT 60 // give HPC 60 sec to finish cmd
#define HPC_GETACCESS_TIMEOUT 60 // seconds
#define POLL_INTERVAL_SEC 2 // poll HPC every 2 seconds
#define POLL_LATCH_CNT 5 // poll latch 5 times, then poll slots
//----------------------------------------------------------------------------
// Winnipeg Architected Register Offsets
//----------------------------------------------------------------------------
#define WPG_I2CMBUFL_OFFSET 0x08 // I2C Message Buffer Low
#define WPG_I2CMOSUP_OFFSET 0x10 // I2C Master Operation Setup Reg
#define WPG_I2CMCNTL_OFFSET 0x20 // I2C Master Control Register
#define WPG_I2CPARM_OFFSET 0x40 // I2C Parameter Register
#define WPG_I2CSTAT_OFFSET 0x70 // I2C Status Register
//----------------------------------------------------------------------------
// Winnipeg Store Type commands (Add this commands to the register offset)
//----------------------------------------------------------------------------
#define WPG_I2C_AND 0x1000 // I2C AND operation
#define WPG_I2C_OR 0x2000 // I2C OR operation
//----------------------------------------------------------------------------
// Command set for I2C Master Operation Setup Register
//----------------------------------------------------------------------------
#define WPG_READATADDR_MASK 0x00010000 // read,bytes,I2C shifted,index
#define WPG_WRITEATADDR_MASK 0x40010000 // write,bytes,I2C shifted,index
#define WPG_READDIRECT_MASK 0x10010000
#define WPG_WRITEDIRECT_MASK 0x60010000
//----------------------------------------------------------------------------
// bit masks for I2C Master Control Register
//----------------------------------------------------------------------------
#define WPG_I2CMCNTL_STARTOP_MASK 0x00000002 // Start the Operation
//----------------------------------------------------------------------------
//
//----------------------------------------------------------------------------
#define WPG_I2C_IOREMAP_SIZE 0x2044 // size of linear address interval
//----------------------------------------------------------------------------
// command index
//----------------------------------------------------------------------------
#define WPG_1ST_SLOT_INDEX 0x01 // index - 1st slot for ctlr
#define WPG_CTLR_INDEX 0x0F // index - ctlr
#define WPG_1ST_EXTSLOT_INDEX 0x10 // index - 1st ext slot for ctlr
#define WPG_1ST_BUS_INDEX 0x1F // index - 1st bus for ctlr
//----------------------------------------------------------------------------
// macro utilities
//----------------------------------------------------------------------------
// if bits 20,22,25,26,27,29,30 are OFF return 1
#define HPC_I2CSTATUS_CHECK(s) ((u8)((s & 0x00000A76) ? 0 : 1))
//----------------------------------------------------------------------------
// global variables
//----------------------------------------------------------------------------
static DEFINE_MUTEX(sem_hpcaccess); // lock access to HPC
static DEFINE_MUTEX(operations_mutex); // lock all operations and
// access to data structures
static DECLARE_COMPLETION(exit_complete); // make sure polling thread goes away
static struct task_struct *ibmphp_poll_thread;
//----------------------------------------------------------------------------
// local function prototypes
//----------------------------------------------------------------------------
static u8 i2c_ctrl_read(struct controller *, void __iomem *, u8);
static u8 i2c_ctrl_write(struct controller *, void __iomem *, u8, u8);
static u8 hpc_writecmdtoindex(u8, u8);
static u8 hpc_readcmdtoindex(u8, u8);
static void get_hpc_access(void);
static void free_hpc_access(void);
static int poll_hpc(void *data);
static int process_changeinstatus(struct slot *, struct slot *);
static int process_changeinlatch(u8, u8, struct controller *);
static int hpc_wait_ctlr_notworking(int, struct controller *, void __iomem *, u8 *);
//----------------------------------------------------------------------------
/*----------------------------------------------------------------------
* Name: i2c_ctrl_read
*
* Action: read from HPC over I2C
*
*---------------------------------------------------------------------*/
static u8 i2c_ctrl_read(struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index)
{
u8 status;
int i;
void __iomem *wpg_addr; // base addr + offset
unsigned long wpg_data; // data to/from WPG LOHI format
unsigned long ultemp;
unsigned long data; // actual data HILO format
debug_polling("%s - Entry WPGBbar[%p] index[%x] \n", __func__, WPGBbar, index);
//--------------------------------------------------------------------
// READ - step 1
// read at address, byte length, I2C address (shifted), index
// or read direct, byte length, index
if (ctlr_ptr->ctlr_type == 0x02) {
data = WPG_READATADDR_MASK;
// fill in I2C address
ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr;
ultemp = ultemp >> 1;
data |= (ultemp << 8);
// fill in index
data |= (unsigned long)index;
} else if (ctlr_ptr->ctlr_type == 0x04) {
data = WPG_READDIRECT_MASK;
// fill in index
ultemp = (unsigned long)index;
ultemp = ultemp << 8;
data |= ultemp;
} else {
err("this controller type is not supported \n");
return HPC_ERROR;
}
wpg_data = swab32(data); // swap data before writing
wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET;
writel(wpg_data, wpg_addr);
//--------------------------------------------------------------------
// READ - step 2 : clear the message buffer
data = 0x00000000;
wpg_data = swab32(data);
wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET;
writel(wpg_data, wpg_addr);
//--------------------------------------------------------------------
// READ - step 3 : issue start operation, I2C master control bit 30:ON
// 2020 : [20] OR operation at [20] offset 0x20
data = WPG_I2CMCNTL_STARTOP_MASK;
wpg_data = swab32(data);
wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR;
writel(wpg_data, wpg_addr);
//--------------------------------------------------------------------
// READ - step 4 : wait until start operation bit clears
i = CMD_COMPLETE_TOUT_SEC;
while (i) {
msleep(10);
wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET;
wpg_data = readl(wpg_addr);
data = swab32(wpg_data);
if (!(data & WPG_I2CMCNTL_STARTOP_MASK))
break;
i--;
}
if (i == 0) {
debug("%s - Error : WPG timeout\n", __func__);
return HPC_ERROR;
}
//--------------------------------------------------------------------
// READ - step 5 : read I2C status register
i = CMD_COMPLETE_TOUT_SEC;
while (i) {
msleep(10);
wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET;
wpg_data = readl(wpg_addr);
data = swab32(wpg_data);
if (HPC_I2CSTATUS_CHECK(data))
break;
i--;
}
if (i == 0) {
debug("ctrl_read - Exit Error:I2C timeout\n");
return HPC_ERROR;
}
//--------------------------------------------------------------------
// READ - step 6 : get DATA
wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET;
wpg_data = readl(wpg_addr);
data = swab32(wpg_data);
status = (u8) data;
debug_polling("%s - Exit index[%x] status[%x]\n", __func__, index, status);
return (status);
}
/*----------------------------------------------------------------------
* Name: i2c_ctrl_write
*
* Action: write to HPC over I2C
*
* Return 0 or error codes
*---------------------------------------------------------------------*/
static u8 i2c_ctrl_write(struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 index, u8 cmd)
{
u8 rc;
void __iomem *wpg_addr; // base addr + offset
unsigned long wpg_data; // data to/from WPG LOHI format
unsigned long ultemp;
unsigned long data; // actual data HILO format
int i;
debug_polling("%s - Entry WPGBbar[%p] index[%x] cmd[%x]\n", __func__, WPGBbar, index, cmd);
rc = 0;
//--------------------------------------------------------------------
// WRITE - step 1
// write at address, byte length, I2C address (shifted), index
// or write direct, byte length, index
data = 0x00000000;
if (ctlr_ptr->ctlr_type == 0x02) {
data = WPG_WRITEATADDR_MASK;
// fill in I2C address
ultemp = (unsigned long)ctlr_ptr->u.wpeg_ctlr.i2c_addr;
ultemp = ultemp >> 1;
data |= (ultemp << 8);
// fill in index
data |= (unsigned long)index;
} else if (ctlr_ptr->ctlr_type == 0x04) {
data = WPG_WRITEDIRECT_MASK;
// fill in index
ultemp = (unsigned long)index;
ultemp = ultemp << 8;
data |= ultemp;
} else {
err("this controller type is not supported \n");
return HPC_ERROR;
}
wpg_data = swab32(data); // swap data before writing
wpg_addr = WPGBbar + WPG_I2CMOSUP_OFFSET;
writel(wpg_data, wpg_addr);
//--------------------------------------------------------------------
// WRITE - step 2 : clear the message buffer
data = 0x00000000 | (unsigned long)cmd;
wpg_data = swab32(data);
wpg_addr = WPGBbar + WPG_I2CMBUFL_OFFSET;
writel(wpg_data, wpg_addr);
//--------------------------------------------------------------------
// WRITE - step 3 : issue start operation,I2C master control bit 30:ON
// 2020 : [20] OR operation at [20] offset 0x20
data = WPG_I2CMCNTL_STARTOP_MASK;
wpg_data = swab32(data);
wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET + WPG_I2C_OR;
writel(wpg_data, wpg_addr);
//--------------------------------------------------------------------
// WRITE - step 4 : wait until start operation bit clears
i = CMD_COMPLETE_TOUT_SEC;
while (i) {
msleep(10);
wpg_addr = WPGBbar + WPG_I2CMCNTL_OFFSET;
wpg_data = readl(wpg_addr);
data = swab32(wpg_data);
if (!(data & WPG_I2CMCNTL_STARTOP_MASK))
break;
i--;
}
if (i == 0) {
debug("%s - Exit Error:WPG timeout\n", __func__);
rc = HPC_ERROR;
}
//--------------------------------------------------------------------
// WRITE - step 5 : read I2C status register
i = CMD_COMPLETE_TOUT_SEC;
while (i) {
msleep(10);
wpg_addr = WPGBbar + WPG_I2CSTAT_OFFSET;
wpg_data = readl(wpg_addr);
data = swab32(wpg_data);
if (HPC_I2CSTATUS_CHECK(data))
break;
i--;
}
if (i == 0) {
debug("ctrl_read - Error : I2C timeout\n");
rc = HPC_ERROR;
}
debug_polling("%s Exit rc[%x]\n", __func__, rc);
return (rc);
}
//------------------------------------------------------------
// Read from ISA type HPC
//------------------------------------------------------------
static u8 isa_ctrl_read(struct controller *ctlr_ptr, u8 offset)
{
u16 start_address;
u8 data;
start_address = ctlr_ptr->u.isa_ctlr.io_start;
data = inb(start_address + offset);
return data;
}
//--------------------------------------------------------------
// Write to ISA type HPC
//--------------------------------------------------------------
static void isa_ctrl_write(struct controller *ctlr_ptr, u8 offset, u8 data)
{
u16 start_address;
u16 port_address;
start_address = ctlr_ptr->u.isa_ctlr.io_start;
port_address = start_address + (u16) offset;
outb(data, port_address);
}
static u8 pci_ctrl_read(struct controller *ctrl, u8 offset)
{
u8 data = 0x00;
debug("inside pci_ctrl_read\n");
if (ctrl->ctrl_dev)
pci_read_config_byte(ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, &data);
return data;
}
static u8 pci_ctrl_write(struct controller *ctrl, u8 offset, u8 data)
{
u8 rc = -ENODEV;
debug("inside pci_ctrl_write\n");
if (ctrl->ctrl_dev) {
pci_write_config_byte(ctrl->ctrl_dev, HPC_PCI_OFFSET + offset, data);
rc = 0;
}
return rc;
}
static u8 ctrl_read(struct controller *ctlr, void __iomem *base, u8 offset)
{
u8 rc;
switch (ctlr->ctlr_type) {
case 0:
rc = isa_ctrl_read(ctlr, offset);
break;
case 1:
rc = pci_ctrl_read(ctlr, offset);
break;
case 2:
case 4:
rc = i2c_ctrl_read(ctlr, base, offset);
break;
default:
return -ENODEV;
}
return rc;
}
static u8 ctrl_write(struct controller *ctlr, void __iomem *base, u8 offset, u8 data)
{
u8 rc = 0;
switch (ctlr->ctlr_type) {
case 0:
isa_ctrl_write(ctlr, offset, data);
break;
case 1:
rc = pci_ctrl_write(ctlr, offset, data);
break;
case 2:
case 4:
rc = i2c_ctrl_write(ctlr, base, offset, data);
break;
default:
return -ENODEV;
}
return rc;
}
/*----------------------------------------------------------------------
* Name: hpc_writecmdtoindex()
*
* Action: convert a write command to proper index within a controller
*
* Return index, HPC_ERROR
*---------------------------------------------------------------------*/
static u8 hpc_writecmdtoindex(u8 cmd, u8 index)
{
u8 rc;
switch (cmd) {
case HPC_CTLR_ENABLEIRQ: // 0x00.N.15
case HPC_CTLR_CLEARIRQ: // 0x06.N.15
case HPC_CTLR_RESET: // 0x07.N.15
case HPC_CTLR_IRQSTEER: // 0x08.N.15
case HPC_CTLR_DISABLEIRQ: // 0x01.N.15
case HPC_ALLSLOT_ON: // 0x11.N.15
case HPC_ALLSLOT_OFF: // 0x12.N.15
rc = 0x0F;
break;
case HPC_SLOT_OFF: // 0x02.Y.0-14
case HPC_SLOT_ON: // 0x03.Y.0-14
case HPC_SLOT_ATTNOFF: // 0x04.N.0-14
case HPC_SLOT_ATTNON: // 0x05.N.0-14
case HPC_SLOT_BLINKLED: // 0x13.N.0-14
rc = index;
break;
case HPC_BUS_33CONVMODE:
case HPC_BUS_66CONVMODE:
case HPC_BUS_66PCIXMODE:
case HPC_BUS_100PCIXMODE:
case HPC_BUS_133PCIXMODE:
rc = index + WPG_1ST_BUS_INDEX - 1;
break;
default:
err("hpc_writecmdtoindex - Error invalid cmd[%x]\n", cmd);
rc = HPC_ERROR;
}
return rc;
}
/*----------------------------------------------------------------------
* Name: hpc_readcmdtoindex()
*
* Action: convert a read command to proper index within a controller
*
* Return index, HPC_ERROR
*---------------------------------------------------------------------*/
static u8 hpc_readcmdtoindex(u8 cmd, u8 index)
{
u8 rc;
switch (cmd) {
case READ_CTLRSTATUS:
rc = 0x0F;
break;
case READ_SLOTSTATUS:
case READ_ALLSTAT:
rc = index;
break;
case READ_EXTSLOTSTATUS:
rc = index + WPG_1ST_EXTSLOT_INDEX;
break;
case READ_BUSSTATUS:
rc = index + WPG_1ST_BUS_INDEX - 1;
break;
case READ_SLOTLATCHLOWREG:
rc = 0x28;
break;
case READ_REVLEVEL:
rc = 0x25;
break;
case READ_HPCOPTIONS:
rc = 0x27;
break;
default:
rc = HPC_ERROR;
}
return rc;
}
/*----------------------------------------------------------------------
* Name: HPCreadslot()
*
* Action: issue a READ command to HPC
*
* Input: pslot - cannot be NULL for READ_ALLSTAT
* pstatus - can be NULL for READ_ALLSTAT
*
* Return 0 or error codes
*---------------------------------------------------------------------*/
int ibmphp_hpc_readslot(struct slot *pslot, u8 cmd, u8 *pstatus)
{
void __iomem *wpg_bbar = NULL;
struct controller *ctlr_ptr;
u8 index, status;
int rc = 0;
int busindex;
debug_polling("%s - Entry pslot[%p] cmd[%x] pstatus[%p]\n", __func__, pslot, cmd, pstatus);
if ((pslot == NULL)
|| ((pstatus == NULL) && (cmd != READ_ALLSTAT) && (cmd != READ_BUSSTATUS))) {
rc = -EINVAL;
err("%s - Error invalid pointer, rc[%d]\n", __func__, rc);
return rc;
}
if (cmd == READ_BUSSTATUS) {
busindex = ibmphp_get_bus_index(pslot->bus);
if (busindex < 0) {
rc = -EINVAL;
err("%s - Exit Error:invalid bus, rc[%d]\n", __func__, rc);
return rc;
} else
index = (u8) busindex;
} else
index = pslot->ctlr_index;
index = hpc_readcmdtoindex(cmd, index);
if (index == HPC_ERROR) {
rc = -EINVAL;
err("%s - Exit Error:invalid index, rc[%d]\n", __func__, rc);
return rc;
}
ctlr_ptr = pslot->ctrl;
get_hpc_access();
//--------------------------------------------------------------------
// map physical address to logical address
//--------------------------------------------------------------------
if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4))
wpg_bbar = ioremap(ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE);
//--------------------------------------------------------------------
// check controller status before reading
//--------------------------------------------------------------------
rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status);
if (!rc) {
switch (cmd) {
case READ_ALLSTAT:
// update the slot structure
pslot->ctrl->status = status;
pslot->status = ctrl_read(ctlr_ptr, wpg_bbar, index);
rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar,
&status);
if (!rc)
pslot->ext_status = ctrl_read(ctlr_ptr, wpg_bbar, index + WPG_1ST_EXTSLOT_INDEX);
break;
case READ_SLOTSTATUS:
// DO NOT update the slot structure
*pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index);
break;
case READ_EXTSLOTSTATUS:
// DO NOT update the slot structure
*pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index);
break;
case READ_CTLRSTATUS:
// DO NOT update the slot structure
*pstatus = status;
break;
case READ_BUSSTATUS:
pslot->busstatus = ctrl_read(ctlr_ptr, wpg_bbar, index);
break;
case READ_REVLEVEL:
*pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index);
break;
case READ_HPCOPTIONS:
*pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index);
break;
case READ_SLOTLATCHLOWREG:
// DO NOT update the slot structure
*pstatus = ctrl_read(ctlr_ptr, wpg_bbar, index);
break;
// Not used
case READ_ALLSLOT:
list_for_each_entry(pslot, &ibmphp_slot_head,
ibm_slot_list) {
index = pslot->ctlr_index;
rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr,
wpg_bbar, &status);
if (!rc) {
pslot->status = ctrl_read(ctlr_ptr, wpg_bbar, index);
rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT,
ctlr_ptr, wpg_bbar, &status);
if (!rc)
pslot->ext_status =
ctrl_read(ctlr_ptr, wpg_bbar,
index + WPG_1ST_EXTSLOT_INDEX);
} else {
err("%s - Error ctrl_read failed\n", __func__);
rc = -EINVAL;
break;
}
}
break;
default:
rc = -EINVAL;
break;
}
}
//--------------------------------------------------------------------
// cleanup
//--------------------------------------------------------------------
// remove physical to logical address mapping
if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4))
iounmap(wpg_bbar);
free_hpc_access();
debug_polling("%s - Exit rc[%d]\n", __func__, rc);
return rc;
}
/*----------------------------------------------------------------------
* Name: ibmphp_hpc_writeslot()
*
* Action: issue a WRITE command to HPC
*---------------------------------------------------------------------*/
int ibmphp_hpc_writeslot(struct slot *pslot, u8 cmd)
{
void __iomem *wpg_bbar = NULL;
struct controller *ctlr_ptr;
u8 index, status;
int busindex;
u8 done;
int rc = 0;
int timeout;
debug_polling("%s - Entry pslot[%p] cmd[%x]\n", __func__, pslot, cmd);
if (pslot == NULL) {
rc = -EINVAL;
err("%s - Error Exit rc[%d]\n", __func__, rc);
return rc;
}
if ((cmd == HPC_BUS_33CONVMODE) || (cmd == HPC_BUS_66CONVMODE) ||
(cmd == HPC_BUS_66PCIXMODE) || (cmd == HPC_BUS_100PCIXMODE) ||
(cmd == HPC_BUS_133PCIXMODE)) {
busindex = ibmphp_get_bus_index(pslot->bus);
if (busindex < 0) {
rc = -EINVAL;
err("%s - Exit Error:invalid bus, rc[%d]\n", __func__, rc);
return rc;
} else
index = (u8) busindex;
} else
index = pslot->ctlr_index;
index = hpc_writecmdtoindex(cmd, index);
if (index == HPC_ERROR) {
rc = -EINVAL;
err("%s - Error Exit rc[%d]\n", __func__, rc);
return rc;
}
ctlr_ptr = pslot->ctrl;
get_hpc_access();
//--------------------------------------------------------------------
// map physical address to logical address
//--------------------------------------------------------------------
if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4)) {
wpg_bbar = ioremap(ctlr_ptr->u.wpeg_ctlr.wpegbbar, WPG_I2C_IOREMAP_SIZE);
debug("%s - ctlr id[%x] physical[%lx] logical[%lx] i2c[%x]\n", __func__,
ctlr_ptr->ctlr_id, (ulong) (ctlr_ptr->u.wpeg_ctlr.wpegbbar), (ulong) wpg_bbar,
ctlr_ptr->u.wpeg_ctlr.i2c_addr);
}
//--------------------------------------------------------------------
// check controller status before writing
//--------------------------------------------------------------------
rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar, &status);
if (!rc) {
ctrl_write(ctlr_ptr, wpg_bbar, index, cmd);
//--------------------------------------------------------------------
// check controller is still not working on the command
//--------------------------------------------------------------------
timeout = CMD_COMPLETE_TOUT_SEC;
done = 0;
while (!done) {
rc = hpc_wait_ctlr_notworking(HPC_CTLR_WORKING_TOUT, ctlr_ptr, wpg_bbar,
&status);
if (!rc) {
if (NEEDTOCHECK_CMDSTATUS(cmd)) {
if (CTLR_FINISHED(status) == HPC_CTLR_FINISHED_YES)
done = 1;
} else
done = 1;
}
if (!done) {
msleep(1000);
if (timeout < 1) {
done = 1;
err("%s - Error command complete timeout\n", __func__);
rc = -EFAULT;
} else
timeout--;
}
}
ctlr_ptr->status = status;
}
// cleanup
// remove physical to logical address mapping
if ((ctlr_ptr->ctlr_type == 2) || (ctlr_ptr->ctlr_type == 4))
iounmap(wpg_bbar);
free_hpc_access();
debug_polling("%s - Exit rc[%d]\n", __func__, rc);
return rc;
}
/*----------------------------------------------------------------------
* Name: get_hpc_access()
*
* Action: make sure only one process can access HPC at one time
*---------------------------------------------------------------------*/
static void get_hpc_access(void)
{
mutex_lock(&sem_hpcaccess);
}
/*----------------------------------------------------------------------
* Name: free_hpc_access()
*---------------------------------------------------------------------*/
void free_hpc_access(void)
{
mutex_unlock(&sem_hpcaccess);
}
/*----------------------------------------------------------------------
* Name: ibmphp_lock_operations()
*
* Action: make sure only one process can change the data structure
*---------------------------------------------------------------------*/
void ibmphp_lock_operations(void)
{
mutex_lock(&operations_mutex);
to_debug = 1;
}
/*----------------------------------------------------------------------
* Name: ibmphp_unlock_operations()
*---------------------------------------------------------------------*/
void ibmphp_unlock_operations(void)
{
debug("%s - Entry\n", __func__);
mutex_unlock(&operations_mutex);
to_debug = 0;
debug("%s - Exit\n", __func__);
}
/*----------------------------------------------------------------------
* Name: poll_hpc()
*---------------------------------------------------------------------*/
#define POLL_LATCH_REGISTER 0
#define POLL_SLOTS 1
#define POLL_SLEEP 2
static int poll_hpc(void *data)
{
struct slot myslot;
struct slot *pslot = NULL;
int rc;
int poll_state = POLL_LATCH_REGISTER;
u8 oldlatchlow = 0x00;
u8 curlatchlow = 0x00;
int poll_count = 0;
u8 ctrl_count = 0x00;
debug("%s - Entry\n", __func__);
while (!kthread_should_stop()) {
/* try to get the lock to do some kind of hardware access */
mutex_lock(&operations_mutex);
switch (poll_state) {
case POLL_LATCH_REGISTER:
oldlatchlow = curlatchlow;
ctrl_count = 0x00;
list_for_each_entry(pslot, &ibmphp_slot_head,
ibm_slot_list) {
if (ctrl_count >= ibmphp_get_total_controllers())
break;
if (pslot->ctrl->ctlr_relative_id == ctrl_count) {
ctrl_count++;
if (READ_SLOT_LATCH(pslot->ctrl)) {
rc = ibmphp_hpc_readslot(pslot,
READ_SLOTLATCHLOWREG,
&curlatchlow);
if (oldlatchlow != curlatchlow)
process_changeinlatch(oldlatchlow,
curlatchlow,
pslot->ctrl);
}
}
}
++poll_count;
poll_state = POLL_SLEEP;
break;
case POLL_SLOTS:
list_for_each_entry(pslot, &ibmphp_slot_head,
ibm_slot_list) {
// make a copy of the old status
memcpy((void *) &myslot, (void *) pslot,
sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_ALLSTAT, NULL);
if ((myslot.status != pslot->status)
|| (myslot.ext_status != pslot->ext_status))
process_changeinstatus(pslot, &myslot);
}
ctrl_count = 0x00;
list_for_each_entry(pslot, &ibmphp_slot_head,
ibm_slot_list) {
if (ctrl_count >= ibmphp_get_total_controllers())
break;
if (pslot->ctrl->ctlr_relative_id == ctrl_count) {
ctrl_count++;
if (READ_SLOT_LATCH(pslot->ctrl))
rc = ibmphp_hpc_readslot(pslot,
READ_SLOTLATCHLOWREG,
&curlatchlow);
}
}
++poll_count;
poll_state = POLL_SLEEP;
break;
case POLL_SLEEP:
/* don't sleep with a lock on the hardware */
mutex_unlock(&operations_mutex);
msleep(POLL_INTERVAL_SEC * 1000);
if (kthread_should_stop())
goto out_sleep;
mutex_lock(&operations_mutex);
if (poll_count >= POLL_LATCH_CNT) {
poll_count = 0;
poll_state = POLL_SLOTS;
} else
poll_state = POLL_LATCH_REGISTER;
break;
}
/* give up the hardware semaphore */
mutex_unlock(&operations_mutex);
/* sleep for a short time just for good measure */
out_sleep:
msleep(100);
}
complete(&exit_complete);
debug("%s - Exit\n", __func__);
return 0;
}
/*----------------------------------------------------------------------
* Name: process_changeinstatus
*
* Action: compare old and new slot status, process the change in status
*
* Input: pointer to slot struct, old slot struct
*
* Return 0 or error codes
* Value:
*
* Side
* Effects: None.
*
* Notes:
*---------------------------------------------------------------------*/
static int process_changeinstatus(struct slot *pslot, struct slot *poldslot)
{
u8 status;
int rc = 0;
u8 disable = 0;
u8 update = 0;
debug("process_changeinstatus - Entry pslot[%p], poldslot[%p]\n", pslot, poldslot);
// bit 0 - HPC_SLOT_POWER
if ((pslot->status & 0x01) != (poldslot->status & 0x01))
update = 1;
// bit 1 - HPC_SLOT_CONNECT
// ignore
// bit 2 - HPC_SLOT_ATTN
if ((pslot->status & 0x04) != (poldslot->status & 0x04))
update = 1;
// bit 3 - HPC_SLOT_PRSNT2
// bit 4 - HPC_SLOT_PRSNT1
if (((pslot->status & 0x08) != (poldslot->status & 0x08))
|| ((pslot->status & 0x10) != (poldslot->status & 0x10)))
update = 1;
// bit 5 - HPC_SLOT_PWRGD
if ((pslot->status & 0x20) != (poldslot->status & 0x20))
// OFF -> ON: ignore, ON -> OFF: disable slot
if ((poldslot->status & 0x20) && (SLOT_CONNECT(poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT(poldslot->status)))
disable = 1;
// bit 6 - HPC_SLOT_BUS_SPEED
// ignore
// bit 7 - HPC_SLOT_LATCH
if ((pslot->status & 0x80) != (poldslot->status & 0x80)) {
update = 1;
// OPEN -> CLOSE
if (pslot->status & 0x80) {
if (SLOT_PWRGD(pslot->status)) {
// power goes on and off after closing latch
// check again to make sure power is still ON
msleep(1000);
rc = ibmphp_hpc_readslot(pslot, READ_SLOTSTATUS, &status);
if (SLOT_PWRGD(status))
update = 1;
else // overwrite power in pslot to OFF
pslot->status &= ~HPC_SLOT_POWER;
}
}
// CLOSE -> OPEN
else if ((SLOT_PWRGD(poldslot->status) == HPC_SLOT_PWRGD_GOOD)
&& (SLOT_CONNECT(poldslot->status) == HPC_SLOT_CONNECTED) && (SLOT_PRESENT(poldslot->status))) {
disable = 1;
}
// else - ignore
}
// bit 4 - HPC_SLOT_BLINK_ATTN
if ((pslot->ext_status & 0x08) != (poldslot->ext_status & 0x08))
update = 1;
if (disable) {
debug("process_changeinstatus - disable slot\n");
pslot->flag = 0;
rc = ibmphp_do_disable_slot(pslot);
}
if (update || disable)
ibmphp_update_slot_info(pslot);
debug("%s - Exit rc[%d] disable[%x] update[%x]\n", __func__, rc, disable, update);
return rc;
}
/*----------------------------------------------------------------------
* Name: process_changeinlatch
*
* Action: compare old and new latch reg status, process the change
*
* Input: old and current latch register status
*
* Return 0 or error codes
* Value:
*---------------------------------------------------------------------*/
static int process_changeinlatch(u8 old, u8 new, struct controller *ctrl)
{
struct slot myslot, *pslot;
u8 i;
u8 mask;
int rc = 0;
debug("%s - Entry old[%x], new[%x]\n", __func__, old, new);
// bit 0 reserved, 0 is LSB, check bit 1-6 for 6 slots
for (i = ctrl->starting_slot_num; i <= ctrl->ending_slot_num; i++) {
mask = 0x01 << i;
if ((mask & old) != (mask & new)) {
pslot = ibmphp_get_slot_from_physical_num(i);
if (pslot) {
memcpy((void *) &myslot, (void *) pslot, sizeof(struct slot));
rc = ibmphp_hpc_readslot(pslot, READ_ALLSTAT, NULL);
debug("%s - call process_changeinstatus for slot[%d]\n", __func__, i);
process_changeinstatus(pslot, &myslot);
} else {
rc = -EINVAL;
err("%s - Error bad pointer for slot[%d]\n", __func__, i);
}
}
}
debug("%s - Exit rc[%d]\n", __func__, rc);
return rc;
}
/*----------------------------------------------------------------------
* Name: ibmphp_hpc_start_poll_thread
*
* Action: start polling thread
*---------------------------------------------------------------------*/
int __init ibmphp_hpc_start_poll_thread(void)
{
debug("%s - Entry\n", __func__);
ibmphp_poll_thread = kthread_run(poll_hpc, NULL, "hpc_poll");
if (IS_ERR(ibmphp_poll_thread)) {
err("%s - Error, thread not started\n", __func__);
return PTR_ERR(ibmphp_poll_thread);
}
return 0;
}
/*----------------------------------------------------------------------
* Name: ibmphp_hpc_stop_poll_thread
*
* Action: stop polling thread and cleanup
*---------------------------------------------------------------------*/
void __exit ibmphp_hpc_stop_poll_thread(void)
{
debug("%s - Entry\n", __func__);
kthread_stop(ibmphp_poll_thread);
debug("before locking operations\n");
ibmphp_lock_operations();
debug("after locking operations\n");
// wait for poll thread to exit
debug("before exit_complete down\n");
wait_for_completion(&exit_complete);
debug("after exit_completion down\n");
// cleanup
debug("before free_hpc_access\n");
free_hpc_access();
debug("after free_hpc_access\n");
ibmphp_unlock_operations();
debug("after unlock operations\n");
debug("%s - Exit\n", __func__);
}
/*----------------------------------------------------------------------
* Name: hpc_wait_ctlr_notworking
*
* Action: wait until the controller is in a not working state
*
* Return 0, HPC_ERROR
* Value:
*---------------------------------------------------------------------*/
static int hpc_wait_ctlr_notworking(int timeout, struct controller *ctlr_ptr, void __iomem *wpg_bbar,
u8 *pstatus)
{
int rc = 0;
u8 done = 0;
debug_polling("hpc_wait_ctlr_notworking - Entry timeout[%d]\n", timeout);
while (!done) {
*pstatus = ctrl_read(ctlr_ptr, wpg_bbar, WPG_CTLR_INDEX);
if (*pstatus == HPC_ERROR) {
rc = HPC_ERROR;
done = 1;
}
if (CTLR_WORKING(*pstatus) == HPC_CTLR_WORKING_NO)
done = 1;
if (!done) {
msleep(1000);
if (timeout < 1) {
done = 1;
err("HPCreadslot - Error ctlr timeout\n");
rc = HPC_ERROR;
} else
timeout--;
}
}
debug_polling("hpc_wait_ctlr_notworking - Exit rc[%x] status[%x]\n", rc, *pstatus);
return rc;
}