diff options
Diffstat (limited to 'drivers/pci/hotplug/ibmphp_hpc.c')
| -rw-r--r-- | drivers/pci/hotplug/ibmphp_hpc.c | 71 |
1 files changed, 18 insertions, 53 deletions
diff --git a/drivers/pci/hotplug/ibmphp_hpc.c b/drivers/pci/hotplug/ibmphp_hpc.c index a6b458e4ab46..2324167656a6 100644 --- a/drivers/pci/hotplug/ibmphp_hpc.c +++ b/drivers/pci/hotplug/ibmphp_hpc.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * IBM Hot Plug Controller Driver * @@ -7,21 +8,6 @@ * * 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 <gregkh@us.ibm.com> * <jshah@us.ibm.com> * @@ -29,13 +15,13 @@ #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/semaphore.h> #include <linux/kthread.h> #include "ibmphp.h" @@ -102,10 +88,10 @@ static int to_debug = 0; //---------------------------------------------------------------------------- // global variables //---------------------------------------------------------------------------- -static struct mutex sem_hpcaccess; // lock access to HPC -static struct semaphore semOperations; // lock all operations and +static DEFINE_MUTEX(sem_hpcaccess); // lock access to HPC +static DEFINE_MUTEX(operations_mutex); // lock all operations and // access to data structures -static struct semaphore sem_exit; // make sure polling thread goes away +static DECLARE_COMPLETION(exit_complete); // make sure polling thread goes away static struct task_struct *ibmphp_poll_thread; //---------------------------------------------------------------------------- // local function prototypes @@ -124,23 +110,6 @@ static int hpc_wait_ctlr_notworking(int, struct controller *, void __iomem *, u8 /*---------------------------------------------------------------------- -* Name: ibmphp_hpc_initvars -* -* Action: initialize semaphores and variables -*---------------------------------------------------------------------*/ -void __init ibmphp_hpc_initvars(void) -{ - debug("%s - Entry\n", __func__); - - mutex_init(&sem_hpcaccess); - sema_init(&semOperations, 1); - sema_init(&sem_exit, 0); - to_debug = 0; - - debug("%s - Exit\n", __func__); -} - -/*---------------------------------------------------------------------- * Name: i2c_ctrl_read * * Action: read from HPC over I2C @@ -155,7 +124,7 @@ static u8 i2c_ctrl_read(struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 i unsigned long ultemp; unsigned long data; // actual data HILO format - debug_polling("%s - Entry WPGBbar[%p] index[%x] \n", __func__, WPGBbar, index); + debug_polling("%s - Entry WPGBbar[%p] index[%x]\n", __func__, WPGBbar, index); //-------------------------------------------------------------------- // READ - step 1 @@ -178,7 +147,7 @@ static u8 i2c_ctrl_read(struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 i ultemp = ultemp << 8; data |= ultemp; } else { - err("this controller type is not supported \n"); + err("this controller type is not supported\n"); return HPC_ERROR; } @@ -289,7 +258,7 @@ static u8 i2c_ctrl_write(struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 ultemp = ultemp << 8; data |= ultemp; } else { - err("this controller type is not supported \n"); + err("this controller type is not supported\n"); return HPC_ERROR; } @@ -356,11 +325,9 @@ static u8 i2c_ctrl_write(struct controller *ctlr_ptr, void __iomem *WPGBbar, u8 static u8 isa_ctrl_read(struct controller *ctlr_ptr, u8 offset) { u16 start_address; - u16 end_address; u8 data; start_address = ctlr_ptr->u.isa_ctlr.io_start; - end_address = ctlr_ptr->u.isa_ctlr.io_end; data = inb(start_address + offset); return data; } @@ -794,7 +761,7 @@ void free_hpc_access(void) *---------------------------------------------------------------------*/ void ibmphp_lock_operations(void) { - down(&semOperations); + mutex_lock(&operations_mutex); to_debug = 1; } @@ -804,7 +771,7 @@ void ibmphp_lock_operations(void) void ibmphp_unlock_operations(void) { debug("%s - Entry\n", __func__); - up(&semOperations); + mutex_unlock(&operations_mutex); to_debug = 0; debug("%s - Exit\n", __func__); } @@ -830,7 +797,7 @@ static int poll_hpc(void *data) while (!kthread_should_stop()) { /* try to get the lock to do some kind of hardware access */ - down(&semOperations); + mutex_lock(&operations_mutex); switch (poll_state) { case POLL_LATCH_REGISTER: @@ -885,13 +852,13 @@ static int poll_hpc(void *data) break; case POLL_SLEEP: /* don't sleep with a lock on the hardware */ - up(&semOperations); + mutex_unlock(&operations_mutex); msleep(POLL_INTERVAL_SEC * 1000); if (kthread_should_stop()) goto out_sleep; - down(&semOperations); + mutex_lock(&operations_mutex); if (poll_count >= POLL_LATCH_CNT) { poll_count = 0; @@ -901,12 +868,12 @@ static int poll_hpc(void *data) break; } /* give up the hardware semaphore */ - up(&semOperations); + mutex_unlock(&operations_mutex); /* sleep for a short time just for good measure */ out_sleep: msleep(100); } - up(&sem_exit); + complete(&exit_complete); debug("%s - Exit\n", __func__); return 0; } @@ -1074,9 +1041,9 @@ void __exit ibmphp_hpc_stop_poll_thread(void) debug("after locking operations\n"); // wait for poll thread to exit - debug("before sem_exit down\n"); - down(&sem_exit); - debug("after sem_exit down\n"); + debug("before exit_complete down\n"); + wait_for_completion(&exit_complete); + debug("after exit_completion down\n"); // cleanup debug("before free_hpc_access\n"); @@ -1084,8 +1051,6 @@ void __exit ibmphp_hpc_stop_poll_thread(void) debug("after free_hpc_access\n"); ibmphp_unlock_operations(); debug("after unlock operations\n"); - up(&sem_exit); - debug("after sem exit up\n"); debug("%s - Exit\n", __func__); } |