litmus-rt.git - The LITMUS^RT kernel.

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author	Kukjin Kim <kgene.kim@samsung.com>	2010-01-28 20:23:40 -0500
committer	Ben Dooks <ben-linux@fluff.org>	2010-02-23 20:52:19 -0500
commit	03843a1294073c19783b43f60f3a455dd0672685 (patch)
tree	f7233a8a7f2c96541afabe81cb7c1ce3d27b47c3 /drivers/serial/Kconfig
parent	7f7035f21c10d83994e045a98c0906781dba02d3 (diff)

ARM: S5P6442: Add serial port support

This patch adds UART serial port support for S5P6442. Signed-off-by: Kukjin Kim <kgene.kim@samsung.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>

Diffstat (limited to 'drivers/serial/Kconfig')

-rw-r--r--

drivers/serial/Kconfig

1 files changed, 1 insertions, 1 deletions


diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index b2157c36566d..86590e9a92f5 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig
@@ -551,7 +551,7 @@ config SERIAL_S5PC100
551		551
552	config SERIAL_S5PV210	552	config SERIAL_S5PV210
553	tristate "Samsung S5PV210 Serial port support"	553	tristate "Samsung S5PV210 Serial port support"
554	depends on SERIAL_SAMSUNG && CPU_S5PV210	554	depends on SERIAL_SAMSUNG && (CPU_S5PV210 \|\| CPU_S5P6442)
555	select SERIAL_SAMSUNG_UARTS_4	555	select SERIAL_SAMSUNG_UARTS_4
556	default y	556	default y
557	help	557	help

/* * bsg.c - block layer implementation of the sg v4 interface * * Copyright (C) 2004 Jens Axboe <axboe@suse.de> SUSE Labs * Copyright (C) 2004 Peter M. Jones <pjones@redhat.com> * * This file is subject to the terms and conditions of the GNU General Public * License version 2. See the file "COPYING" in the main directory of this * archive for more details. * */ #include <linux/module.h> #include <linux/init.h> #include <linux/file.h> #include <linux/blkdev.h> #include <linux/poll.h> #include <linux/cdev.h> #include <linux/jiffies.h> #include <linux/percpu.h> #include <linux/uio.h> #include <linux/idr.h> #include <linux/bsg.h> #include <linux/smp_lock.h> #include <scsi/scsi.h> #include <scsi/scsi_ioctl.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_device.h> #include <scsi/scsi_driver.h> #include <scsi/sg.h> #define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" #define BSG_VERSION "0.4" struct bsg_device { struct request_queue *queue; spinlock_t lock; struct list_head busy_list; struct list_head done_list; struct hlist_node dev_list; atomic_t ref_count; int queued_cmds; int done_cmds; wait_queue_head_t wq_done; wait_queue_head_t wq_free; char name[20]; int max_queue; unsigned long flags; }; enum { BSG_F_BLOCK = 1, }; #define BSG_DEFAULT_CMDS 64 #define BSG_MAX_DEVS 32768 #undef BSG_DEBUG #ifdef BSG_DEBUG #define dprintk(fmt, args...) printk(KERN_ERR "%s: " fmt, __func__, ##args) #else #define dprintk(fmt, args...) #endif static DEFINE_MUTEX(bsg_mutex); static DEFINE_IDR(bsg_minor_idr); #define BSG_LIST_ARRAY_SIZE 8 static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE]; static struct class *bsg_class; static int bsg_major; static struct kmem_cache *bsg_cmd_cachep; /* * our internal command type */ struct bsg_command { struct bsg_device *bd; struct list_head list; struct request *rq; struct bio *bio; struct bio *bidi_bio; int err; struct sg_io_v4 hdr; char sense[SCSI_SENSE_BUFFERSIZE]; }; static void bsg_free_command(struct bsg_command *bc) { struct bsg_device *bd = bc->bd; unsigned long flags; kmem_cache_free(bsg_cmd_cachep, bc); spin_lock_irqsave(&bd->lock, flags); bd->queued_cmds--; spin_unlock_irqrestore(&bd->lock, flags); wake_up(&bd->wq_free); } static struct bsg_command *bsg_alloc_command(struct bsg_device *bd) { struct bsg_command *bc = ERR_PTR(-EINVAL); spin_lock_irq(&bd->lock); if (bd->queued_cmds >= bd->max_queue) goto out; bd->queued_cmds++; spin_unlock_irq(&bd->lock); bc = kmem_cache_zalloc(bsg_cmd_cachep, GFP_KERNEL); if (unlikely(!bc)) { spin_lock_irq(&bd->lock); bd->queued_cmds--; bc = ERR_PTR(-ENOMEM); goto out; } bc->bd = bd; INIT_LIST_HEAD(&bc->list); dprintk("%s: returning free cmd %p\n", bd->name, bc); return bc; out: spin_unlock_irq(&bd->lock); return bc; } static inline struct hlist_head *bsg_dev_idx_hash(int index) { return &bsg_device_list[index & (BSG_LIST_ARRAY_SIZE - 1)]; } static int bsg_io_schedule(struct bsg_device *bd) { DEFINE_WAIT(wait); int ret = 0; spin_lock_irq(&bd->lock); BUG_ON(bd->done_cmds > bd->queued_cmds); /* * -ENOSPC or -ENODATA? I'm going for -ENODATA, meaning "I have no * work to do", even though we return -ENOSPC after this same test * during bsg_write() -- there, it means our buffer can't have more * bsg_commands added to it, thus has no space left. */ if (bd->done_cmds == bd->queued_cmds) { ret = -ENODATA; goto unlock; } if (!test_bit(BSG_F_BLOCK, &bd->flags)) { ret = -EAGAIN; goto unlock; } prepare_to_wait(&bd->wq_done, &wait, TASK_UNINTERRUPTIBLE); spin_unlock_irq(&bd->lock); io_schedule(); finish_wait(&bd->wq_done, &wait); return ret; unlock: spin_unlock_irq(&bd->lock); return ret; } static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, struct sg_io_v4 *hdr, struct bsg_device *bd, fmode_t has_write_perm) { if (hdr->request_len > BLK_MAX_CDB) { rq->cmd = kzalloc(hdr->request_len, GFP_KERNEL); if (!rq->cmd) return -ENOMEM; } if (copy_from_user(rq->cmd, (void *)(unsigned long)hdr->request, hdr->request_len)) return -EFAULT; if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { if (blk_verify_command(rq->cmd, has_write_perm)) return -EPERM; } else if (!capable(CAP_SYS_RAWIO)) return -EPERM; /* * fill in request structure */ rq->cmd_len = hdr->request_len; rq->cmd_type = REQ_TYPE_BLOCK_PC; rq->timeout = msecs_to_jiffies(hdr->timeout); if (!rq->timeout) rq->timeout = q->sg_timeout; if (!rq->timeout) rq->timeout = BLK_DEFAULT_SG_TIMEOUT; if (rq->timeout < BLK_MIN_SG_TIMEOUT) rq->timeout = BLK_MIN_SG_TIMEOUT; return 0; } /* * Check if sg_io_v4 from user is allowed and valid */ static int bsg_validate_sgv4_hdr(struct request_queue *q, struct sg_io_v4 *hdr, int *rw) { int ret = 0; if (hdr->guard != 'Q') return -EINVAL; switch (hdr->protocol) { case BSG_PROTOCOL_SCSI: switch (hdr->subprotocol) { case BSG_SUB_PROTOCOL_SCSI_CMD: case BSG_SUB_PROTOCOL_SCSI_TRANSPORT: break; default: ret = -EINVAL; } break; default: ret = -EINVAL; } *rw = hdr->dout_xfer_len ? WRITE : READ; return ret; } /* * map sg_io_v4 to a request. */ static struct request * bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm, u8 *sense) { struct request_queue *q = bd->queue; struct request *rq, *next_rq = NULL; int ret, rw; unsigned int dxfer_len; void *dxferp = NULL; dprintk("map hdr %llx/%u %llx/%u\n", (unsigned long long) hdr->dout_xferp, hdr->dout_xfer_len, (unsigned long long) hdr->din_xferp, hdr->din_xfer_len); ret = bsg_validate_sgv4_hdr(q, hdr, &rw); if (ret) return ERR_PTR(ret); /* * map scatter-gather elements seperately and string them to request */ rq = blk_get_request(q, rw, GFP_KERNEL); if (!rq) return ERR_PTR(-ENOMEM); ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm); if (ret) goto out; if (rw == WRITE && hdr->din_xfer_len) { if (!test_bit(QUEUE_FLAG_BIDI, &q->queue_flags)) { ret = -EOPNOTSUPP; goto out; } next_rq = blk_get_request(q, READ, GFP_KERNEL); if (!next_rq) { ret = -ENOMEM; goto out; } rq->next_rq = next_rq; next_rq->cmd_type = rq->cmd_type; dxferp = (void*)(unsigned long)hdr->din_xferp; ret = blk_rq_map_user(q, next_rq, NULL, dxferp, hdr->din_xfer_len, GFP_KERNEL); if (ret) goto out; } if (hdr->dout_xfer_len) { dxfer_len = hdr->dout_xfer_len; dxferp = (void*)(unsigned long)hdr->dout_xferp; } else if (hdr->din_xfer_len) { dxfer_len = hdr->din_xfer_len; dxferp = (void*)(unsigned long)hdr->din_xferp; } else dxfer_len = 0; if (dxfer_len) { ret = blk_rq_map_user(q, rq, NULL, dxferp, dxfer_len, GFP_KERNEL); if (ret) goto out; } rq->sense = sense; rq->sense_len = 0; return rq; out: if (rq->cmd != rq->__cmd) kfree(rq->cmd); blk_put_request(rq); if (next_rq) { blk_rq_unmap_user(next_rq->bio); blk_put_request(next_rq); } return ERR_PTR(ret); } /* * async completion call-back from the block layer, when scsi/ide/whatever * calls end_that_request_last() on a request */ static void bsg_rq_end_io(struct request *rq, int uptodate) { struct bsg_command *bc = rq->end_io_data; struct bsg_device *bd = bc->bd; unsigned long flags; dprintk("%s: finished rq %p bc %p, bio %p stat %d\n", bd->name, rq, bc, bc->bio, uptodate); bc->hdr.duration = jiffies_to_msecs(jiffies - bc->hdr.duration); spin_lock_irqsave(&bd->lock, flags); list_move_tail(&bc->list, &bd->done_list); bd->done_cmds++; spin_unlock_irqrestore(&bd->lock, flags); wake_up(&bd->wq_done); } /* * do final setup of a 'bc' and submit the matching 'rq' to the block * layer for io */ static void bsg_add_command(struct bsg_device *bd, struct request_queue *q, struct bsg_command *bc, struct request *rq) { int at_head = (0 == (bc->hdr.flags & BSG_FLAG_Q_AT_TAIL)); /* * add bc command to busy queue and submit rq for io */ bc->rq = rq; bc->bio = rq->bio; if (rq->next_rq) bc->bidi_bio = rq->next_rq->bio; bc->hdr.duration = jiffies; spin_lock_irq(&bd->lock); list_add_tail(&bc->list, &bd->busy_list); spin_unlock_irq(&bd->lock); dprintk("%s: queueing rq %p, bc %p\n", bd->name, rq, bc); rq->end_io_data = bc; blk_execute_rq_nowait(q, NULL, rq, at_head, bsg_rq_end_io); } static struct bsg_command *bsg_next_done_cmd(struct bsg_device *bd) { struct bsg_command *bc = NULL; spin_lock_irq(&bd->lock); if (bd->done_cmds) { bc = list_first_entry(&bd->done_list, struct bsg_command, list); list_del(&bc->list); bd->done_cmds--; } spin_unlock_irq(&bd->lock); return bc; } /* * Get a finished command from the done list */


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