diff options
Diffstat (limited to 'drivers/char/snsc.c')
| -rw-r--r-- | drivers/char/snsc.c | 469 |
1 files changed, 0 insertions, 469 deletions
diff --git a/drivers/char/snsc.c b/drivers/char/snsc.c deleted file mode 100644 index 5918ea7499bb..000000000000 --- a/drivers/char/snsc.c +++ /dev/null @@ -1,469 +0,0 @@ -/* - * SN Platform system controller communication support - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - * - * Copyright (C) 2004, 2006 Silicon Graphics, Inc. All rights reserved. - */ - -/* - * System controller communication driver - * - * This driver allows a user process to communicate with the system - * controller (a.k.a. "IRouter") network in an SGI SN system. - */ - -#include <linux/interrupt.h> -#include <linux/sched/signal.h> -#include <linux/device.h> -#include <linux/poll.h> -#include <linux/init.h> -#include <linux/slab.h> -#include <linux/mutex.h> -#include <asm/sn/io.h> -#include <asm/sn/sn_sal.h> -#include <asm/sn/module.h> -#include <asm/sn/geo.h> -#include <asm/sn/nodepda.h> -#include "snsc.h" - -#define SYSCTL_BASENAME "snsc" - -#define SCDRV_BUFSZ 2048 -#define SCDRV_TIMEOUT 1000 - -static DEFINE_MUTEX(scdrv_mutex); -static irqreturn_t -scdrv_interrupt(int irq, void *subch_data) -{ - struct subch_data_s *sd = subch_data; - unsigned long flags; - int status; - - spin_lock_irqsave(&sd->sd_rlock, flags); - spin_lock(&sd->sd_wlock); - status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch); - - if (status > 0) { - if (status & SAL_IROUTER_INTR_RECV) { - wake_up(&sd->sd_rq); - } - if (status & SAL_IROUTER_INTR_XMIT) { - ia64_sn_irtr_intr_disable - (sd->sd_nasid, sd->sd_subch, - SAL_IROUTER_INTR_XMIT); - wake_up(&sd->sd_wq); - } - } - spin_unlock(&sd->sd_wlock); - spin_unlock_irqrestore(&sd->sd_rlock, flags); - return IRQ_HANDLED; -} - -/* - * scdrv_open - * - * Reserve a subchannel for system controller communication. - */ - -static int -scdrv_open(struct inode *inode, struct file *file) -{ - struct sysctl_data_s *scd; - struct subch_data_s *sd; - int rv; - - /* look up device info for this device file */ - scd = container_of(inode->i_cdev, struct sysctl_data_s, scd_cdev); - - /* allocate memory for subchannel data */ - sd = kzalloc(sizeof (struct subch_data_s), GFP_KERNEL); - if (sd == NULL) { - printk("%s: couldn't allocate subchannel data\n", - __func__); - return -ENOMEM; - } - - /* initialize subch_data_s fields */ - sd->sd_nasid = scd->scd_nasid; - sd->sd_subch = ia64_sn_irtr_open(scd->scd_nasid); - - if (sd->sd_subch < 0) { - kfree(sd); - printk("%s: couldn't allocate subchannel\n", __func__); - return -EBUSY; - } - - spin_lock_init(&sd->sd_rlock); - spin_lock_init(&sd->sd_wlock); - init_waitqueue_head(&sd->sd_rq); - init_waitqueue_head(&sd->sd_wq); - sema_init(&sd->sd_rbs, 1); - sema_init(&sd->sd_wbs, 1); - - file->private_data = sd; - - /* hook this subchannel up to the system controller interrupt */ - mutex_lock(&scdrv_mutex); - rv = request_irq(SGI_UART_VECTOR, scdrv_interrupt, - IRQF_SHARED, SYSCTL_BASENAME, sd); - if (rv) { - ia64_sn_irtr_close(sd->sd_nasid, sd->sd_subch); - kfree(sd); - printk("%s: irq request failed (%d)\n", __func__, rv); - mutex_unlock(&scdrv_mutex); - return -EBUSY; - } - mutex_unlock(&scdrv_mutex); - return 0; -} - -/* - * scdrv_release - * - * Release a previously-reserved subchannel. - */ - -static int -scdrv_release(struct inode *inode, struct file *file) -{ - struct subch_data_s *sd = (struct subch_data_s *) file->private_data; - int rv; - - /* free the interrupt */ - free_irq(SGI_UART_VECTOR, sd); - - /* ask SAL to close the subchannel */ - rv = ia64_sn_irtr_close(sd->sd_nasid, sd->sd_subch); - - kfree(sd); - return rv; -} - -/* - * scdrv_read - * - * Called to read bytes from the open IRouter pipe. - * - */ - -static inline int -read_status_check(struct subch_data_s *sd, int *len) -{ - return ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch, sd->sd_rb, len); -} - -static ssize_t -scdrv_read(struct file *file, char __user *buf, size_t count, loff_t *f_pos) -{ - int status; - int len; - unsigned long flags; - struct subch_data_s *sd = (struct subch_data_s *) file->private_data; - - /* try to get control of the read buffer */ - if (down_trylock(&sd->sd_rbs)) { - /* somebody else has it now; - * if we're non-blocking, then exit... - */ - if (file->f_flags & O_NONBLOCK) { - return -EAGAIN; - } - /* ...or if we want to block, then do so here */ - if (down_interruptible(&sd->sd_rbs)) { - /* something went wrong with wait */ - return -ERESTARTSYS; - } - } - - /* anything to read? */ - len = CHUNKSIZE; - spin_lock_irqsave(&sd->sd_rlock, flags); - status = read_status_check(sd, &len); - - /* if not, and we're blocking I/O, loop */ - while (status < 0) { - DECLARE_WAITQUEUE(wait, current); - - if (file->f_flags & O_NONBLOCK) { - spin_unlock_irqrestore(&sd->sd_rlock, flags); - up(&sd->sd_rbs); - return -EAGAIN; - } - - len = CHUNKSIZE; - set_current_state(TASK_INTERRUPTIBLE); - add_wait_queue(&sd->sd_rq, &wait); - spin_unlock_irqrestore(&sd->sd_rlock, flags); - - schedule_timeout(msecs_to_jiffies(SCDRV_TIMEOUT)); - - remove_wait_queue(&sd->sd_rq, &wait); - if (signal_pending(current)) { - /* wait was interrupted */ - up(&sd->sd_rbs); - return -ERESTARTSYS; - } - - spin_lock_irqsave(&sd->sd_rlock, flags); - status = read_status_check(sd, &len); - } - spin_unlock_irqrestore(&sd->sd_rlock, flags); - - if (len > 0) { - /* we read something in the last read_status_check(); copy - * it out to user space - */ - if (count < len) { - pr_debug("%s: only accepting %d of %d bytes\n", - __func__, (int) count, len); - } - len = min((int) count, len); - if (copy_to_user(buf, sd->sd_rb, len)) - len = -EFAULT; - } - - /* release the read buffer and wake anyone who might be - * waiting for it - */ - up(&sd->sd_rbs); - - /* return the number of characters read in */ - return len; -} - -/* - * scdrv_write - * - * Writes a chunk of an IRouter packet (or other system controller data) - * to the system controller. - * - */ -static inline int -write_status_check(struct subch_data_s *sd, int count) -{ - return ia64_sn_irtr_send(sd->sd_nasid, sd->sd_subch, sd->sd_wb, count); -} - -static ssize_t -scdrv_write(struct file *file, const char __user *buf, - size_t count, loff_t *f_pos) -{ - unsigned long flags; - int status; - struct subch_data_s *sd = (struct subch_data_s *) file->private_data; - - /* try to get control of the write buffer */ - if (down_trylock(&sd->sd_wbs)) { - /* somebody else has it now; - * if we're non-blocking, then exit... - */ - if (file->f_flags & O_NONBLOCK) { - return -EAGAIN; - } - /* ...or if we want to block, then do so here */ - if (down_interruptible(&sd->sd_wbs)) { - /* something went wrong with wait */ - return -ERESTARTSYS; - } - } - - count = min((int) count, CHUNKSIZE); - if (copy_from_user(sd->sd_wb, buf, count)) { - up(&sd->sd_wbs); - return -EFAULT; - } - - /* try to send the buffer */ - spin_lock_irqsave(&sd->sd_wlock, flags); - status = write_status_check(sd, count); - - /* if we failed, and we want to block, then loop */ - while (status <= 0) { - DECLARE_WAITQUEUE(wait, current); - - if (file->f_flags & O_NONBLOCK) { - spin_unlock_irqrestore(&sd->sd_wlock, flags); - up(&sd->sd_wbs); - return -EAGAIN; - } - - set_current_state(TASK_INTERRUPTIBLE); - add_wait_queue(&sd->sd_wq, &wait); - spin_unlock_irqrestore(&sd->sd_wlock, flags); - - schedule_timeout(msecs_to_jiffies(SCDRV_TIMEOUT)); - - remove_wait_queue(&sd->sd_wq, &wait); - if (signal_pending(current)) { - /* wait was interrupted */ - up(&sd->sd_wbs); - return -ERESTARTSYS; - } - - spin_lock_irqsave(&sd->sd_wlock, flags); - status = write_status_check(sd, count); - } - spin_unlock_irqrestore(&sd->sd_wlock, flags); - - /* release the write buffer and wake anyone who's waiting for it */ - up(&sd->sd_wbs); - - /* return the number of characters accepted (should be the complete - * "chunk" as requested) - */ - if ((status >= 0) && (status < count)) { - pr_debug("Didn't accept the full chunk; %d of %d\n", - status, (int) count); - } - return status; -} - -static __poll_t -scdrv_poll(struct file *file, struct poll_table_struct *wait) -{ - __poll_t mask = 0; - int status = 0; - struct subch_data_s *sd = (struct subch_data_s *) file->private_data; - unsigned long flags; - - poll_wait(file, &sd->sd_rq, wait); - poll_wait(file, &sd->sd_wq, wait); - - spin_lock_irqsave(&sd->sd_rlock, flags); - spin_lock(&sd->sd_wlock); - status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch); - spin_unlock(&sd->sd_wlock); - spin_unlock_irqrestore(&sd->sd_rlock, flags); - - if (status > 0) { - if (status & SAL_IROUTER_INTR_RECV) { - mask |= EPOLLIN | EPOLLRDNORM; - } - if (status & SAL_IROUTER_INTR_XMIT) { - mask |= EPOLLOUT | EPOLLWRNORM; - } - } - - return mask; -} - -static const struct file_operations scdrv_fops = { - .owner = THIS_MODULE, - .read = scdrv_read, - .write = scdrv_write, - .poll = scdrv_poll, - .open = scdrv_open, - .release = scdrv_release, - .llseek = noop_llseek, -}; - -static struct class *snsc_class; - -/* - * scdrv_init - * - * Called at boot time to initialize the system controller communication - * facility. - */ -int __init -scdrv_init(void) -{ - geoid_t geoid; - cnodeid_t cnode; - char devname[32]; - char *devnamep; - struct sysctl_data_s *scd; - void *salbuf; - dev_t first_dev, dev; - nasid_t event_nasid; - - if (!ia64_platform_is("sn2")) - return -ENODEV; - - event_nasid = ia64_sn_get_console_nasid(); - - snsc_class = class_create(THIS_MODULE, SYSCTL_BASENAME); - if (IS_ERR(snsc_class)) { - printk("%s: failed to allocate class\n", __func__); - return PTR_ERR(snsc_class); - } - - if (alloc_chrdev_region(&first_dev, 0, num_cnodes, - SYSCTL_BASENAME) < 0) { - printk("%s: failed to register SN system controller device\n", - __func__); - return -ENODEV; - } - - for (cnode = 0; cnode < num_cnodes; cnode++) { - geoid = cnodeid_get_geoid(cnode); - devnamep = devname; - format_module_id(devnamep, geo_module(geoid), - MODULE_FORMAT_BRIEF); - devnamep = devname + strlen(devname); - sprintf(devnamep, "^%d#%d", geo_slot(geoid), - geo_slab(geoid)); - - /* allocate sysctl device data */ - scd = kzalloc(sizeof (struct sysctl_data_s), - GFP_KERNEL); - if (!scd) { - printk("%s: failed to allocate device info" - "for %s/%s\n", __func__, - SYSCTL_BASENAME, devname); - continue; - } - - /* initialize sysctl device data fields */ - scd->scd_nasid = cnodeid_to_nasid(cnode); - if (!(salbuf = kmalloc(SCDRV_BUFSZ, GFP_KERNEL))) { - printk("%s: failed to allocate driver buffer" - "(%s%s)\n", __func__, - SYSCTL_BASENAME, devname); - kfree(scd); - continue; - } - - if (ia64_sn_irtr_init(scd->scd_nasid, salbuf, - SCDRV_BUFSZ) < 0) { - printk - ("%s: failed to initialize SAL for" - " system controller communication" - " (%s/%s): outdated PROM?\n", - __func__, SYSCTL_BASENAME, devname); - kfree(scd); - kfree(salbuf); - continue; - } - - dev = first_dev + cnode; - cdev_init(&scd->scd_cdev, &scdrv_fops); - if (cdev_add(&scd->scd_cdev, dev, 1)) { - printk("%s: failed to register system" - " controller device (%s%s)\n", - __func__, SYSCTL_BASENAME, devname); - kfree(scd); - kfree(salbuf); - continue; - } - - device_create(snsc_class, NULL, dev, NULL, - "%s", devname); - - ia64_sn_irtr_intr_enable(scd->scd_nasid, - 0 /*ignored */ , - SAL_IROUTER_INTR_RECV); - - /* on the console nasid, prepare to receive - * system controller environmental events - */ - if(scd->scd_nasid == event_nasid) { - scdrv_event_init(scd); - } - } - return 0; -} -device_initcall(scdrv_init); |