diff options
Diffstat (limited to 'drivers/s390/char/raw3270.c')
| -rw-r--r-- | drivers/s390/char/raw3270.c | 1335 |
1 files changed, 1335 insertions, 0 deletions
diff --git a/drivers/s390/char/raw3270.c b/drivers/s390/char/raw3270.c new file mode 100644 index 00000000000..8e16a971668 --- /dev/null +++ b/drivers/s390/char/raw3270.c @@ -0,0 +1,1335 @@ +/* + * drivers/s390/char/raw3270.c + * IBM/3270 Driver - core functions. + * + * Author(s): + * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global) + * Rewritten for 2.5 by Martin Schwidefsky <schwidefsky@de.ibm.com> + * -- Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation + */ + +#include <linux/config.h> +#include <linux/bootmem.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/wait.h> + +#include <asm/ccwdev.h> +#include <asm/cio.h> +#include <asm/ebcdic.h> + +#include "raw3270.h" + +/* The main 3270 data structure. */ +struct raw3270 { + struct list_head list; + struct ccw_device *cdev; + int minor; + + short model, rows, cols; + unsigned long flags; + + struct list_head req_queue; /* Request queue. */ + struct list_head view_list; /* List of available views. */ + struct raw3270_view *view; /* Active view. */ + + struct timer_list timer; /* Device timer. */ + + unsigned char *ascebc; /* ascii -> ebcdic table */ +}; + +/* raw3270->flags */ +#define RAW3270_FLAGS_14BITADDR 0 /* 14-bit buffer addresses */ +#define RAW3270_FLAGS_BUSY 1 /* Device busy, leave it alone */ +#define RAW3270_FLAGS_ATTN 2 /* Device sent an ATTN interrupt */ +#define RAW3270_FLAGS_READY 4 /* Device is useable by views */ +#define RAW3270_FLAGS_CONSOLE 8 /* Device is the console. */ + +/* Semaphore to protect global data of raw3270 (devices, views, etc). */ +static DECLARE_MUTEX(raw3270_sem); + +/* List of 3270 devices. */ +static struct list_head raw3270_devices = LIST_HEAD_INIT(raw3270_devices); + +/* + * Flag to indicate if the driver has been registered. Some operations + * like waiting for the end of i/o need to be done differently as long + * as the kernel is still starting up (console support). + */ +static int raw3270_registered; + +/* Module parameters */ +static int tubxcorrect = 0; +module_param(tubxcorrect, bool, 0); + +/* + * Wait queue for device init/delete, view delete. + */ +DECLARE_WAIT_QUEUE_HEAD(raw3270_wait_queue); + +/* + * Encode array for 12 bit 3270 addresses. + */ +unsigned char raw3270_ebcgraf[64] = { + 0x40, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, + 0xc8, 0xc9, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, + 0x50, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, + 0xd8, 0xd9, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, + 0x60, 0x61, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, + 0xe8, 0xe9, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, + 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, + 0xf8, 0xf9, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f +}; + +void +raw3270_buffer_address(struct raw3270 *rp, char *cp, unsigned short addr) +{ + if (test_bit(RAW3270_FLAGS_14BITADDR, &rp->flags)) { + cp[0] = (addr >> 8) & 0x3f; + cp[1] = addr & 0xff; + } else { + cp[0] = raw3270_ebcgraf[(addr >> 6) & 0x3f]; + cp[1] = raw3270_ebcgraf[addr & 0x3f]; + } +} + +/* + * Allocate a new 3270 ccw request + */ +struct raw3270_request * +raw3270_request_alloc(size_t size) +{ + struct raw3270_request *rq; + + /* Allocate request structure */ + rq = kmalloc(sizeof(struct raw3270_request), GFP_KERNEL | GFP_DMA); + if (!rq) + return ERR_PTR(-ENOMEM); + memset(rq, 0, sizeof(struct raw3270_request)); + + /* alloc output buffer. */ + if (size > 0) { + rq->buffer = kmalloc(size, GFP_KERNEL | GFP_DMA); + if (!rq->buffer) { + kfree(rq); + return ERR_PTR(-ENOMEM); + } + } + rq->size = size; + INIT_LIST_HEAD(&rq->list); + + /* + * Setup ccw. + */ + rq->ccw.cda = __pa(rq->buffer); + rq->ccw.flags = CCW_FLAG_SLI; + + return rq; +} + +#ifdef CONFIG_TN3270_CONSOLE +/* + * Allocate a new 3270 ccw request from bootmem. Only works very + * early in the boot process. Only con3270.c should be using this. + */ +struct raw3270_request * +raw3270_request_alloc_bootmem(size_t size) +{ + struct raw3270_request *rq; + + rq = alloc_bootmem_low(sizeof(struct raw3270)); + if (!rq) + return ERR_PTR(-ENOMEM); + memset(rq, 0, sizeof(struct raw3270_request)); + + /* alloc output buffer. */ + if (size > 0) { + rq->buffer = alloc_bootmem_low(size); + if (!rq->buffer) { + free_bootmem((unsigned long) rq, + sizeof(struct raw3270)); + return ERR_PTR(-ENOMEM); + } + } + rq->size = size; + INIT_LIST_HEAD(&rq->list); + + /* + * Setup ccw. + */ + rq->ccw.cda = __pa(rq->buffer); + rq->ccw.flags = CCW_FLAG_SLI; + + return rq; +} +#endif + +/* + * Free 3270 ccw request + */ +void +raw3270_request_free (struct raw3270_request *rq) +{ + if (rq->buffer) + kfree(rq->buffer); + kfree(rq); +} + +/* + * Reset request to initial state. + */ +void +raw3270_request_reset(struct raw3270_request *rq) +{ + BUG_ON(!list_empty(&rq->list)); + rq->ccw.cmd_code = 0; + rq->ccw.count = 0; + rq->ccw.cda = __pa(rq->buffer); + rq->ccw.flags = CCW_FLAG_SLI; + rq->rescnt = 0; + rq->rc = 0; +} + +/* + * Set command code to ccw of a request. + */ +void +raw3270_request_set_cmd(struct raw3270_request *rq, u8 cmd) +{ + rq->ccw.cmd_code = cmd; +} + +/* + * Add data fragment to output buffer. + */ +int +raw3270_request_add_data(struct raw3270_request *rq, void *data, size_t size) +{ + if (size + rq->ccw.count > rq->size) + return -E2BIG; + memcpy(rq->buffer + rq->ccw.count, data, size); + rq->ccw.count += size; + return 0; +} + +/* + * Set address/length pair to ccw of a request. + */ +void +raw3270_request_set_data(struct raw3270_request *rq, void *data, size_t size) +{ + rq->ccw.cda = __pa(data); + rq->ccw.count = size; +} + +/* + * Set idal buffer to ccw of a request. + */ +void +raw3270_request_set_idal(struct raw3270_request *rq, struct idal_buffer *ib) +{ + rq->ccw.cda = __pa(ib->data); + rq->ccw.count = ib->size; + rq->ccw.flags |= CCW_FLAG_IDA; +} + +/* + * Stop running ccw. + */ +static int +raw3270_halt_io_nolock(struct raw3270 *rp, struct raw3270_request *rq) +{ + int retries; + int rc; + + if (raw3270_request_final(rq)) + return 0; + /* Check if interrupt has already been processed */ + for (retries = 0; retries < 5; retries++) { + if (retries < 2) + rc = ccw_device_halt(rp->cdev, (long) rq); + else + rc = ccw_device_clear(rp->cdev, (long) rq); + if (rc == 0) + break; /* termination successful */ + } + return rc; +} + +static int +raw3270_halt_io(struct raw3270 *rp, struct raw3270_request *rq) +{ + unsigned long flags; + int rc; + + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + rc = raw3270_halt_io_nolock(rp, rq); + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + return rc; +} + +/* + * Add the request to the request queue, try to start it if the + * 3270 device is idle. Return without waiting for end of i/o. + */ +static int +__raw3270_start(struct raw3270 *rp, struct raw3270_view *view, + struct raw3270_request *rq) +{ + rq->view = view; + raw3270_get_view(view); + if (list_empty(&rp->req_queue) && + !test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) { + /* No other requests are on the queue. Start this one. */ + rq->rc = ccw_device_start(rp->cdev, &rq->ccw, + (unsigned long) rq, 0, 0); + if (rq->rc) { + raw3270_put_view(view); + return rq->rc; + } + } + list_add_tail(&rq->list, &rp->req_queue); + return 0; +} + +int +raw3270_start(struct raw3270_view *view, struct raw3270_request *rq) +{ + unsigned long flags; + struct raw3270 *rp; + int rc; + + spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags); + rp = view->dev; + if (!rp || rp->view != view) + rc = -EACCES; + else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags)) + rc = -ENODEV; + else + rc = __raw3270_start(rp, view, rq); + spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags); + return rc; +} + +int +raw3270_start_irq(struct raw3270_view *view, struct raw3270_request *rq) +{ + struct raw3270 *rp; + + rp = view->dev; + rq->view = view; + raw3270_get_view(view); + list_add_tail(&rq->list, &rp->req_queue); + return 0; +} + +/* + * 3270 interrupt routine, called from the ccw_device layer + */ +static void +raw3270_irq (struct ccw_device *cdev, unsigned long intparm, struct irb *irb) +{ + struct raw3270 *rp; + struct raw3270_view *view; + struct raw3270_request *rq; + int rc; + + rp = (struct raw3270 *) cdev->dev.driver_data; + if (!rp) + return; + rq = (struct raw3270_request *) intparm; + view = rq ? rq->view : rp->view; + + if (IS_ERR(irb)) + rc = RAW3270_IO_RETRY; + else if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) { + rq->rc = -EIO; + rc = RAW3270_IO_DONE; + } else if (irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END | + DEV_STAT_UNIT_EXCEP)) { + /* Handle CE-DE-UE and subsequent UDE */ + set_bit(RAW3270_FLAGS_BUSY, &rp->flags); + rc = RAW3270_IO_BUSY; + } else if (test_bit(RAW3270_FLAGS_BUSY, &rp->flags)) { + /* Wait for UDE if busy flag is set. */ + if (irb->scsw.dstat & DEV_STAT_DEV_END) { + clear_bit(RAW3270_FLAGS_BUSY, &rp->flags); + /* Got it, now retry. */ + rc = RAW3270_IO_RETRY; + } else + rc = RAW3270_IO_BUSY; + } else if (view) + rc = view->fn->intv(view, rq, irb); + else + rc = RAW3270_IO_DONE; + + switch (rc) { + case RAW3270_IO_DONE: + break; + case RAW3270_IO_BUSY: + /* + * Intervention required by the operator. We have to wait + * for unsolicited device end. + */ + return; + case RAW3270_IO_RETRY: + if (!rq) + break; + rq->rc = ccw_device_start(rp->cdev, &rq->ccw, + (unsigned long) rq, 0, 0); + if (rq->rc == 0) + return; /* Sucessfully restarted. */ + break; + case RAW3270_IO_STOP: + if (!rq) + break; + raw3270_halt_io_nolock(rp, rq); + rq->rc = -EIO; + break; + default: + BUG(); + } + if (rq) { + BUG_ON(list_empty(&rq->list)); + /* The request completed, remove from queue and do callback. */ + list_del_init(&rq->list); + if (rq->callback) + rq->callback(rq, rq->callback_data); + /* Do put_device for get_device in raw3270_start. */ + raw3270_put_view(view); + } + /* + * Try to start each request on request queue until one is + * started successful. + */ + while (!list_empty(&rp->req_queue)) { + rq = list_entry(rp->req_queue.next,struct raw3270_request,list); + rq->rc = ccw_device_start(rp->cdev, &rq->ccw, + (unsigned long) rq, 0, 0); + if (rq->rc == 0) + break; + /* Start failed. Remove request and do callback. */ + list_del_init(&rq->list); + if (rq->callback) + rq->callback(rq, rq->callback_data); + /* Do put_device for get_device in raw3270_start. */ + raw3270_put_view(view); + } +} + +/* + * Size sensing. + */ + +struct raw3270_ua { /* Query Reply structure for Usable Area */ + struct { /* Usable Area Query Reply Base */ + short l; /* Length of this structured field */ + char sfid; /* 0x81 if Query Reply */ + char qcode; /* 0x81 if Usable Area */ + char flags0; + char flags1; + short w; /* Width of usable area */ + short h; /* Heigth of usavle area */ + char units; /* 0x00:in; 0x01:mm */ + int xr; + int yr; + char aw; + char ah; + short buffsz; /* Character buffer size, bytes */ + char xmin; + char ymin; + char xmax; + char ymax; + } __attribute__ ((packed)) uab; + struct { /* Alternate Usable Area Self-Defining Parameter */ + char l; /* Length of this Self-Defining Parm */ + char sdpid; /* 0x02 if Alternate Usable Area */ + char res; + char auaid; /* 0x01 is Id for the A U A */ + short wauai; /* Width of AUAi */ + short hauai; /* Height of AUAi */ + char auaunits; /* 0x00:in, 0x01:mm */ + int auaxr; + int auayr; + char awauai; + char ahauai; + } __attribute__ ((packed)) aua; +} __attribute__ ((packed)); + +static unsigned char raw3270_init_data[256]; +static struct raw3270_request raw3270_init_request; +static struct diag210 raw3270_init_diag210; +static DECLARE_MUTEX(raw3270_init_sem); + +static int +raw3270_init_irq(struct raw3270_view *view, struct raw3270_request *rq, + struct irb *irb) +{ + /* + * Unit-Check Processing: + * Expect Command Reject or Intervention Required. + */ + if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK) { + /* Request finished abnormally. */ + if (irb->ecw[0] & SNS0_INTERVENTION_REQ) { + set_bit(RAW3270_FLAGS_BUSY, &view->dev->flags); + return RAW3270_IO_BUSY; + } + } + if (rq) { + if (irb->scsw.dstat & DEV_STAT_UNIT_CHECK) { + if (irb->ecw[0] & SNS0_CMD_REJECT) + rq->rc = -EOPNOTSUPP; + else + rq->rc = -EIO; + } else + /* Request finished normally. Copy residual count. */ + rq->rescnt = irb->scsw.count; + } + if (irb->scsw.dstat & DEV_STAT_ATTENTION) { + set_bit(RAW3270_FLAGS_ATTN, &view->dev->flags); + wake_up(&raw3270_wait_queue); + } + return RAW3270_IO_DONE; +} + +static struct raw3270_fn raw3270_init_fn = { + .intv = raw3270_init_irq +}; + +static struct raw3270_view raw3270_init_view = { + .fn = &raw3270_init_fn +}; + +/* + * raw3270_wait/raw3270_wait_interruptible/__raw3270_wakeup + * Wait for end of request. The request must have been started + * with raw3270_start, rc = 0. The device lock may NOT have been + * released between calling raw3270_start and raw3270_wait. + */ +static void +raw3270_wake_init(struct raw3270_request *rq, void *data) +{ + wake_up((wait_queue_head_t *) data); +} + +/* + * Special wait function that can cope with console initialization. + */ +static int +raw3270_start_init(struct raw3270 *rp, struct raw3270_view *view, + struct raw3270_request *rq) +{ + unsigned long flags; + wait_queue_head_t wq; + int rc; + +#ifdef CONFIG_TN3270_CONSOLE + if (raw3270_registered == 0) { + spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags); + rq->callback = 0; + rc = __raw3270_start(rp, view, rq); + if (rc == 0) + while (!raw3270_request_final(rq)) { + wait_cons_dev(); + barrier(); + } + spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags); + return rq->rc; + } +#endif + init_waitqueue_head(&wq); + rq->callback = raw3270_wake_init; + rq->callback_data = &wq; + spin_lock_irqsave(get_ccwdev_lock(view->dev->cdev), flags); + rc = __raw3270_start(rp, view, rq); + spin_unlock_irqrestore(get_ccwdev_lock(view->dev->cdev), flags); + if (rc) + return rc; + /* Now wait for the completion. */ + rc = wait_event_interruptible(wq, raw3270_request_final(rq)); + if (rc == -ERESTARTSYS) { /* Interrupted by a signal. */ + raw3270_halt_io(view->dev, rq); + /* No wait for the halt to complete. */ + wait_event(wq, raw3270_request_final(rq)); + return -ERESTARTSYS; + } + return rq->rc; +} + +static int +__raw3270_size_device_vm(struct raw3270 *rp) +{ + int rc, model; + + raw3270_init_diag210.vrdcdvno = + _ccw_device_get_device_number(rp->cdev); + raw3270_init_diag210.vrdclen = sizeof(struct diag210); + rc = diag210(&raw3270_init_diag210); + if (rc) + return rc; + model = raw3270_init_diag210.vrdccrmd; + switch (model) { + case 2: + rp->model = model; + rp->rows = 24; + rp->cols = 80; + break; + case 3: + rp->model = model; + rp->rows = 32; + rp->cols = 80; + break; + case 4: + rp->model = model; + rp->rows = 43; + rp->cols = 80; + break; + case 5: + rp->model = model; + rp->rows = 27; + rp->cols = 132; + break; + default: + printk(KERN_WARNING "vrdccrmd is 0x%.8x\n", model); + rc = -EOPNOTSUPP; + break; + } + return rc; +} + +static int +__raw3270_size_device(struct raw3270 *rp) +{ + static const unsigned char wbuf[] = + { 0x00, 0x07, 0x01, 0xff, 0x03, 0x00, 0x81 }; + struct raw3270_ua *uap; + unsigned short count; + int rc; + + /* + * To determine the size of the 3270 device we need to do: + * 1) send a 'read partition' data stream to the device + * 2) wait for the attn interrupt that preceeds the query reply + * 3) do a read modified to get the query reply + * To make things worse we have to cope with intervention + * required (3270 device switched to 'stand-by') and command + * rejects (old devices that can't do 'read partition'). + */ + memset(&raw3270_init_request, 0, sizeof(raw3270_init_request)); + memset(raw3270_init_data, 0, sizeof(raw3270_init_data)); + /* Store 'read partition' data stream to raw3270_init_data */ + memcpy(raw3270_init_data, wbuf, sizeof(wbuf)); + INIT_LIST_HEAD(&raw3270_init_request.list); + raw3270_init_request.ccw.cmd_code = TC_WRITESF; + raw3270_init_request.ccw.flags = CCW_FLAG_SLI; + raw3270_init_request.ccw.count = sizeof(wbuf); + raw3270_init_request.ccw.cda = (__u32) __pa(raw3270_init_data); + + rc = raw3270_start_init(rp, &raw3270_init_view, &raw3270_init_request); + if (rc) { + /* Check error cases: -ERESTARTSYS, -EIO and -EOPNOTSUPP */ + if (rc == -EOPNOTSUPP && MACHINE_IS_VM) + return __raw3270_size_device_vm(rp); + return rc; + } + + /* Wait for attention interrupt. */ +#ifdef CONFIG_TN3270_CONSOLE + if (raw3270_registered == 0) { + unsigned long flags; + + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + while (!test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags)) + wait_cons_dev(); + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + } else +#endif + rc = wait_event_interruptible(raw3270_wait_queue, + test_and_clear_bit(RAW3270_FLAGS_ATTN, &rp->flags)); + if (rc) + return rc; + + /* + * The device accepted the 'read partition' command. Now + * set up a read ccw and issue it. + */ + raw3270_init_request.ccw.cmd_code = TC_READMOD; + raw3270_init_request.ccw.flags = CCW_FLAG_SLI; + raw3270_init_request.ccw.count = sizeof(raw3270_init_data); + raw3270_init_request.ccw.cda = (__u32) __pa(raw3270_init_data); + rc = raw3270_start_init(rp, &raw3270_init_view, &raw3270_init_request); + if (rc) + return rc; + /* Got a Query Reply */ + count = sizeof(raw3270_init_data) - raw3270_init_request.rescnt; + uap = (struct raw3270_ua *) (raw3270_init_data + 1); + /* Paranoia check. */ + if (raw3270_init_data[0] != 0x88 || uap->uab.qcode != 0x81) + return -EOPNOTSUPP; + /* Copy rows/columns of default Usable Area */ + rp->rows = uap->uab.h; + rp->cols = uap->uab.w; + /* Check for 14 bit addressing */ + if ((uap->uab.flags0 & 0x0d) == 0x01) + set_bit(RAW3270_FLAGS_14BITADDR, &rp->flags); + /* Check for Alternate Usable Area */ + if (uap->uab.l == sizeof(struct raw3270_ua) && + uap->aua.sdpid == 0x02) { + rp->rows = uap->aua.hauai; + rp->cols = uap->aua.wauai; + } + return 0; +} + +static int +raw3270_size_device(struct raw3270 *rp) +{ + int rc; + + down(&raw3270_init_sem); + rp->view = &raw3270_init_view; + raw3270_init_view.dev = rp; + rc = __raw3270_size_device(rp); + raw3270_init_view.dev = 0; + rp->view = 0; + up(&raw3270_init_sem); + if (rc == 0) { /* Found something. */ + /* Try to find a model. */ + rp->model = 0; + if (rp->rows == 24 && rp->cols == 80) + rp->model = 2; + if (rp->rows == 32 && rp->cols == 80) + rp->model = 3; + if (rp->rows == 43 && rp->cols == 80) + rp->model = 4; + if (rp->rows == 27 && rp->cols == 132) + rp->model = 5; + } + return rc; +} + +static int +raw3270_reset_device(struct raw3270 *rp) +{ + int rc; + + down(&raw3270_init_sem); + memset(&raw3270_init_request, 0, sizeof(raw3270_init_request)); + memset(raw3270_init_data, 0, sizeof(raw3270_init_data)); + /* Store reset data stream to raw3270_init_data/raw3270_init_request */ + raw3270_init_data[0] = TW_KR; + INIT_LIST_HEAD(&raw3270_init_request.list); + raw3270_init_request.ccw.cmd_code = TC_EWRITEA; + raw3270_init_request.ccw.flags = CCW_FLAG_SLI; + raw3270_init_request.ccw.count = 1; + raw3270_init_request.ccw.cda = (__u32) __pa(raw3270_init_data); + rp->view = &raw3270_init_view; + raw3270_init_view.dev = rp; + rc = raw3270_start_init(rp, &raw3270_init_view, &raw3270_init_request); + raw3270_init_view.dev = 0; + rp->view = 0; + up(&raw3270_init_sem); + return rc; +} + +/* + * Setup new 3270 device. + */ +static int +raw3270_setup_device(struct ccw_device *cdev, struct raw3270 *rp, char *ascebc) +{ + struct list_head *l; + struct raw3270 *tmp; + int minor; + + memset(rp, 0, sizeof(struct raw3270)); + /* Copy ebcdic -> ascii translation table. */ + memcpy(ascebc, _ascebc, 256); + if (tubxcorrect) { + /* correct brackets and circumflex */ + ascebc['['] = 0xad; + ascebc[']'] = 0xbd; + ascebc['^'] = 0xb0; + } + rp->ascebc = ascebc; + + /* Set defaults. */ + rp->rows = 24; + rp->cols = 80; + + INIT_LIST_HEAD(&rp->req_queue); + INIT_LIST_HEAD(&rp->view_list); + + /* + * Add device to list and find the smallest unused minor + * number for it. + */ + down(&raw3270_sem); + /* Keep the list sorted. */ + minor = 0; + rp->minor = -1; + list_for_each(l, &raw3270_devices) { + tmp = list_entry(l, struct raw3270, list); + if (tmp->minor > minor) { + rp->minor = minor; + __list_add(&rp->list, l->prev, l); + break; + } + minor++; + } + if (rp->minor == -1 && minor < RAW3270_MAXDEVS) { + rp->minor = minor; + list_add_tail(&rp->list, &raw3270_devices); + } + up(&raw3270_sem); + /* No free minor number? Then give up. */ + if (rp->minor == -1) + return -EUSERS; + rp->cdev = cdev; + cdev->dev.driver_data = rp; + cdev->handler = raw3270_irq; + return 0; +} + +#ifdef CONFIG_TN3270_CONSOLE +/* + * Setup 3270 device configured as console. + */ +struct raw3270 * +raw3270_setup_console(struct ccw_device *cdev) +{ + struct raw3270 *rp; + char *ascebc; + int rc; + + rp = (struct raw3270 *) alloc_bootmem(sizeof(struct raw3270)); + ascebc = (char *) alloc_bootmem(256); + rc = raw3270_setup_device(cdev, rp, ascebc); + if (rc) + return ERR_PTR(rc); + set_bit(RAW3270_FLAGS_CONSOLE, &rp->flags); + rc = raw3270_reset_device(rp); + if (rc) + return ERR_PTR(rc); + rc = raw3270_size_device(rp); + if (rc) + return ERR_PTR(rc); + rc = raw3270_reset_device(rp); + if (rc) + return ERR_PTR(rc); + set_bit(RAW3270_FLAGS_READY, &rp->flags); + return rp; +} + +void +raw3270_wait_cons_dev(struct raw3270 *rp) +{ + unsigned long flags; + + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + wait_cons_dev(); + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); +} + +#endif + +/* + * Create a 3270 device structure. + */ +static struct raw3270 * +raw3270_create_device(struct ccw_device *cdev) +{ + struct raw3270 *rp; + char *ascebc; + int rc; + + rp = kmalloc(sizeof(struct raw3270), GFP_KERNEL); + if (!rp) + return ERR_PTR(-ENOMEM); + ascebc = kmalloc(256, GFP_KERNEL); + if (!ascebc) { + kfree(rp); + return ERR_PTR(-ENOMEM); + } + rc = raw3270_setup_device(cdev, rp, ascebc); + if (rc) { + kfree(rp->ascebc); + kfree(rp); + rp = ERR_PTR(rc); + } + /* Get reference to ccw_device structure. */ + get_device(&cdev->dev); + return rp; +} + +/* + * Activate a view. + */ +int +raw3270_activate_view(struct raw3270_view *view) +{ + struct raw3270 *rp; + struct raw3270_view *oldview, *nv; + unsigned long flags; + int rc; + + rp = view->dev; + if (!rp) + return -ENODEV; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + if (rp->view == view) + rc = 0; + else if (!test_bit(RAW3270_FLAGS_READY, &rp->flags)) + rc = -ENODEV; + else { + oldview = 0; + if (rp->view) { + oldview = rp->view; + oldview->fn->deactivate(oldview); + } + rp->view = view; + rc = view->fn->activate(view); + if (rc) { + /* Didn't work. Try to reactivate the old view. */ + rp->view = oldview; + if (!oldview || oldview->fn->activate(oldview) != 0) { + /* Didn't work as well. Try any other view. */ + list_for_each_entry(nv, &rp->view_list, list) + if (nv != view && nv != oldview) { + rp->view = nv; + if (nv->fn->activate(nv) == 0) + break; + rp->view = 0; + } + } + } + } + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + return rc; +} + +/* + * Deactivate current view. + */ +void +raw3270_deactivate_view(struct raw3270_view *view) +{ + unsigned long flags; + struct raw3270 *rp; + + rp = view->dev; + if (!rp) + return; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + if (rp->view == view) { + view->fn->deactivate(view); + rp->view = 0; + /* Move deactivated view to end of list. */ + list_del_init(&view->list); + list_add_tail(&view->list, &rp->view_list); + /* Try to activate another view. */ + if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) { + list_for_each_entry(view, &rp->view_list, list) + if (view->fn->activate(view) == 0) { + rp->view = view; + break; + } + } + } + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); +} + +/* + * Add view to device with minor "minor". + */ +int +raw3270_add_view(struct raw3270_view *view, struct raw3270_fn *fn, int minor) +{ + unsigned long flags; + struct raw3270 *rp; + int rc; + + down(&raw3270_sem); + rc = -ENODEV; + list_for_each_entry(rp, &raw3270_devices, list) { + if (rp->minor != minor) + continue; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) { + atomic_set(&view->ref_count, 2); + view->dev = rp; + view->fn = fn; + view->model = rp->model; + view->rows = rp->rows; + view->cols = rp->cols; + view->ascebc = rp->ascebc; + spin_lock_init(&view->lock); + list_add_tail(&view->list, &rp->view_list); + rc = 0; + } + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + break; + } + up(&raw3270_sem); + return rc; +} + +/* + * Find specific view of device with minor "minor". + */ +struct raw3270_view * +raw3270_find_view(struct raw3270_fn *fn, int minor) +{ + struct raw3270 *rp; + struct raw3270_view *view, *tmp; + unsigned long flags; + + down(&raw3270_sem); + view = ERR_PTR(-ENODEV); + list_for_each_entry(rp, &raw3270_devices, list) { + if (rp->minor != minor) + continue; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + if (test_bit(RAW3270_FLAGS_READY, &rp->flags)) { + view = ERR_PTR(-ENOENT); + list_for_each_entry(tmp, &rp->view_list, list) { + if (tmp->fn == fn) { + raw3270_get_view(tmp); + view = tmp; + break; + } + } + } + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + break; + } + up(&raw3270_sem); + return view; +} + +/* + * Remove view from device and free view structure via call to view->fn->free. + */ +void +raw3270_del_view(struct raw3270_view *view) +{ + unsigned long flags; + struct raw3270 *rp; + struct raw3270_view *nv; + + rp = view->dev; + spin_lock_irqsave(get_ccwdev_lock(rp->cdev), flags); + if (rp->view == view) { + view->fn->deactivate(view); + rp->view = 0; + } + list_del_init(&view->list); + if (!rp->view && test_bit(RAW3270_FLAGS_READY, &rp->flags)) { + /* Try to activate another view. */ + list_for_each_entry(nv, &rp->view_list, list) { + if (nv->fn->activate(view) == 0) { + rp->view = nv; + break; + } + } + } + spin_unlock_irqrestore(get_ccwdev_lock(rp->cdev), flags); + /* Wait for reference counter to drop to zero. */ + atomic_dec(&view->ref_count); + wait_event(raw3270_wait_queue, atomic_read(&view->ref_count) == 0); + if (view->fn->free) + view->fn->free(view); +} + +/* + * Remove a 3270 device structure. + */ +static void +raw3270_delete_device(struct raw3270 *rp) +{ + struct ccw_device *cdev; + + /* Remove from device chain. */ + down(&raw3270_sem); + list_del_init(&rp->list); + up(&raw3270_sem); + + /* Disconnect from ccw_device. */ + cdev = rp->cdev; + rp->cdev = 0; + cdev->dev.driver_data = 0; + cdev->handler = 0; + + /* Put ccw_device structure. */ + put_device(&cdev->dev); + + /* Now free raw3270 structure. */ + kfree(rp->ascebc); + kfree(rp); +} + +static int +raw3270_probe (struct ccw_device *cdev) +{ + return 0; +} + +/* + * Additional attributes for a 3270 device + */ +static ssize_t +raw3270_model_show(struct device *dev, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%i\n", + ((struct raw3270 *) dev->driver_data)->model); +} +static DEVICE_ATTR(model, 0444, raw3270_model_show, 0); + +static ssize_t +raw3270_rows_show(struct device *dev, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%i\n", + ((struct raw3270 *) dev->driver_data)->rows); +} +static DEVICE_ATTR(rows, 0444, raw3270_rows_show, 0); + +static ssize_t +raw3270_columns_show(struct device *dev, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%i\n", + ((struct raw3270 *) dev->driver_data)->cols); +} +static DEVICE_ATTR(columns, 0444, raw3270_columns_show, 0); + +static struct attribute * raw3270_attrs[] = { + &dev_attr_model.attr, + &dev_attr_rows.attr, + &dev_attr_columns.attr, + NULL, +}; + +static struct attribute_group raw3270_attr_group = { + .attrs = raw3270_attrs, +}; + +static void +raw3270_create_attributes(struct raw3270 *rp) +{ + //FIXME: check return code + sysfs_create_group(&rp->cdev->dev.kobj, &raw3270_attr_group); +} + +/* + * Notifier for device addition/removal + */ +struct raw3270_notifier { + struct list_head list; + void (*notifier)(int, int); +}; + +static struct list_head raw3270_notifier = LIST_HEAD_INIT(raw3270_notifier); + +int raw3270_register_notifier(void (*notifier)(int, int)) +{ + struct raw3270_notifier *np; + struct raw3270 *rp; + + np = kmalloc(sizeof(struct raw3270_notifier), GFP_KERNEL); + if (!np) + return -ENOMEM; + np->notifier = notifier; + down(&raw3270_sem); + list_add_tail(&np->list, &raw3270_notifier); + list_for_each_entry(rp, &raw3270_devices, list) { + get_device(&rp->cdev->dev); + notifier(rp->minor, 1); + } + up(&raw3270_sem); + return 0; +} + +void raw3270_unregister_notifier(void (*notifier)(int, int)) +{ + struct raw3270_notifier *np; + + down(&raw3270_sem); + list_for_each_entry(np, &raw3270_notifier, list) + if (np->notifier == notifier) { + list_del(&np->list); + kfree(np); + break; + } + up(&raw3270_sem); +} + +/* + * Set 3270 device online. + */ +static int +raw3270_set_online (struct ccw_device *cdev) +{ + struct raw3270 *rp; + struct raw3270_notifier *np; + int rc; + + rp = raw3270_create_device(cdev); + if (IS_ERR(rp)) + return PTR_ERR(rp); + rc = raw3270_reset_device(rp); + if (rc) + return rc; + rc = raw3270_size_device(rp); + if (rc) + return rc; + rc = raw3270_reset_device(rp); + if (rc) + return rc; + raw3270_create_attributes(rp); + set_bit(RAW3270_FLAGS_READY, &rp->flags); + down(&raw3270_sem); + list_for_each_entry(np, &raw3270_notifier, list) + np->notifier(rp->minor, 1); + up(&raw3270_sem); + return 0; +} + +/* + * Remove 3270 device structure. + */ +static void +raw3270_remove (struct ccw_device *cdev) +{ + unsigned long flags; + struct raw3270 *rp; + struct raw3270_view *v; + struct raw3270_notifier *np; + + rp = cdev->dev.driver_data; + clear_bit(RAW3270_FLAGS_READY, &rp->flags); + + sysfs_remove_group(&cdev->dev.kobj, &raw3270_attr_group); + + /* Deactivate current view and remove all views. */ + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + if (rp->view) { + rp->view->fn->deactivate(rp->view); + rp->view = 0; + } + while (!list_empty(&rp->view_list)) { + v = list_entry(rp->view_list.next, struct raw3270_view, list); + if (v->fn->release) + v->fn->release(v); + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + raw3270_del_view(v); + spin_lock_irqsave(get_ccwdev_lock(cdev), flags); + } + spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); + + down(&raw3270_sem); + list_for_each_entry(np, &raw3270_notifier, list) + np->notifier(rp->minor, 0); + up(&raw3270_sem); + + /* Reset 3270 device. */ + raw3270_reset_device(rp); + /* And finally remove it. */ + raw3270_delete_device(rp); +} + +/* + * Set 3270 device offline. + */ +static int +raw3270_set_offline (struct ccw_device *cdev) +{ + struct raw3270 *rp; + + rp = cdev->dev.driver_data; + if (test_bit(RAW3270_FLAGS_CONSOLE, &rp->flags)) + return -EBUSY; + raw3270_remove(cdev); + return 0; +} + +static struct ccw_device_id raw3270_id[] = { + { CCW_DEVICE(0x3270, 0) }, + { CCW_DEVICE(0x3271, 0) }, + { CCW_DEVICE(0x3272, 0) }, + { CCW_DEVICE(0x3273, 0) }, + { CCW_DEVICE(0x3274, 0) }, + { CCW_DEVICE(0x3275, 0) }, + { CCW_DEVICE(0x3276, 0) }, + { CCW_DEVICE(0x3277, 0) }, + { CCW_DEVICE(0x3278, 0) }, + { CCW_DEVICE(0x3279, 0) }, + { CCW_DEVICE(0x3174, 0) }, + { /* end of list */ }, +}; + +static struct ccw_driver raw3270_ccw_driver = { + .name = "3270", + .owner = THIS_MODULE, + .ids = raw3270_id, + .probe = &raw3270_probe, + .remove = &raw3270_remove, + .set_online = &raw3270_set_online, + .set_offline = &raw3270_set_offline, +}; + +static int +raw3270_init(void) +{ + struct raw3270 *rp; + int rc; + + if (raw3270_registered) + return 0; + raw3270_registered = 1; + rc = ccw_driver_register(&raw3270_ccw_driver); + if (rc == 0) { + /* Create attributes for early (= console) device. */ + down(&raw3270_sem); + list_for_each_entry(rp, &raw3270_devices, list) { + get_device(&rp->cdev->dev); + raw3270_create_attributes(rp); + } + up(&raw3270_sem); + } + return rc; +} + +static void +raw3270_exit(void) +{ + ccw_driver_unregister(&raw3270_ccw_driver); +} + +MODULE_LICENSE("GPL"); + +module_init(raw3270_init); +module_exit(raw3270_exit); + +EXPORT_SYMBOL(raw3270_request_alloc); +EXPORT_SYMBOL(raw3270_request_free); +EXPORT_SYMBOL(raw3270_request_reset); +EXPORT_SYMBOL(raw3270_request_set_cmd); +EXPORT_SYMBOL(raw3270_request_add_data); +EXPORT_SYMBOL(raw3270_request_set_data); +EXPORT_SYMBOL(raw3270_request_set_idal); +EXPORT_SYMBOL(raw3270_buffer_address); +EXPORT_SYMBOL(raw3270_add_view); +EXPORT_SYMBOL(raw3270_del_view); +EXPORT_SYMBOL(raw3270_find_view); +EXPORT_SYMBOL(raw3270_activate_view); +EXPORT_SYMBOL(raw3270_deactivate_view); +EXPORT_SYMBOL(raw3270_start); +EXPORT_SYMBOL(raw3270_start_irq); +EXPORT_SYMBOL(raw3270_register_notifier); +EXPORT_SYMBOL(raw3270_unregister_notifier); +EXPORT_SYMBOL(raw3270_wait_queue); |