ia64/linux-2.6.18-xen.hg

view drivers/serial/ioc3_serial.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2005 Silicon Graphics, Inc. All Rights Reserved.
7 */
9 /*
10 * This file contains a module version of the ioc3 serial driver. This
11 * includes all the support functions needed (support functions, etc.)
12 * and the serial driver itself.
13 */
14 #include <linux/errno.h>
15 #include <linux/tty.h>
16 #include <linux/serial.h>
17 #include <linux/circ_buf.h>
18 #include <linux/serial_reg.h>
19 #include <linux/module.h>
20 #include <linux/pci.h>
21 #include <linux/serial_core.h>
22 #include <linux/ioc3.h>
24 /*
25 * Interesting things about the ioc3
26 */
28 #define LOGICAL_PORTS 2 /* rs232(0) and rs422(1) */
29 #define PORTS_PER_CARD 2
30 #define LOGICAL_PORTS_PER_CARD (PORTS_PER_CARD * LOGICAL_PORTS)
31 #define MAX_CARDS 8
32 #define MAX_LOGICAL_PORTS (LOGICAL_PORTS_PER_CARD * MAX_CARDS)
34 /* determine given the sio_ir what port it applies to */
35 #define GET_PORT_FROM_SIO_IR(_x) (_x & SIO_IR_SA) ? 0 : 1
38 /*
39 * we have 2 logical ports (rs232, rs422) for each physical port
40 * evens are rs232, odds are rs422
41 */
42 #define GET_PHYSICAL_PORT(_x) ((_x) >> 1)
43 #define GET_LOGICAL_PORT(_x) ((_x) & 1)
44 #define IS_PHYSICAL_PORT(_x) !((_x) & 1)
45 #define IS_RS232(_x) !((_x) & 1)
47 static unsigned int Num_of_ioc3_cards;
48 static unsigned int Submodule_slot;
50 /* defining this will get you LOTS of great debug info */
51 //#define DEBUG_INTERRUPTS
52 #define DPRINT_CONFIG(_x...) ;
53 //#define DPRINT_CONFIG(_x...) printk _x
54 #define NOT_PROGRESS() ;
55 //#define NOT_PROGRESS() printk("%s : fails %d\n", __FUNCTION__, __LINE__)
57 /* number of characters we want to transmit to the lower level at a time */
58 #define MAX_CHARS 256
59 #define FIFO_SIZE (MAX_CHARS-1) /* it's a uchar */
61 /* Device name we're using */
62 #define DEVICE_NAME "ttySIOC"
63 #define DEVICE_MAJOR 204
64 #define DEVICE_MINOR 116
66 /* flags for next_char_state */
67 #define NCS_BREAK 0x1
68 #define NCS_PARITY 0x2
69 #define NCS_FRAMING 0x4
70 #define NCS_OVERRUN 0x8
72 /* cause we need SOME parameters ... */
73 #define MIN_BAUD_SUPPORTED 1200
74 #define MAX_BAUD_SUPPORTED 115200
76 /* protocol types supported */
77 #define PROTO_RS232 0
78 #define PROTO_RS422 1
80 /* Notification types */
81 #define N_DATA_READY 0x01
82 #define N_OUTPUT_LOWAT 0x02
83 #define N_BREAK 0x04
84 #define N_PARITY_ERROR 0x08
85 #define N_FRAMING_ERROR 0x10
86 #define N_OVERRUN_ERROR 0x20
87 #define N_DDCD 0x40
88 #define N_DCTS 0x80
90 #define N_ALL_INPUT (N_DATA_READY | N_BREAK \
91 | N_PARITY_ERROR | N_FRAMING_ERROR \
92 | N_OVERRUN_ERROR | N_DDCD | N_DCTS)
94 #define N_ALL_OUTPUT N_OUTPUT_LOWAT
96 #define N_ALL_ERRORS (N_PARITY_ERROR | N_FRAMING_ERROR \
97 | N_OVERRUN_ERROR)
99 #define N_ALL (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK \
100 | N_PARITY_ERROR | N_FRAMING_ERROR \
101 | N_OVERRUN_ERROR | N_DDCD | N_DCTS)
103 #define SER_CLK_SPEED(prediv) ((22000000 << 1) / prediv)
104 #define SER_DIVISOR(x, clk) (((clk) + (x) * 8) / ((x) * 16))
105 #define DIVISOR_TO_BAUD(div, clk) ((clk) / 16 / (div))
107 /* Some masks */
108 #define LCR_MASK_BITS_CHAR (UART_LCR_WLEN5 | UART_LCR_WLEN6 \
109 | UART_LCR_WLEN7 | UART_LCR_WLEN8)
110 #define LCR_MASK_STOP_BITS (UART_LCR_STOP)
112 #define PENDING(_a, _p) (readl(&(_p)->vma->sio_ir) & (_a)->ic_enable)
114 #define RING_BUF_SIZE 4096
115 #define BUF_SIZE_BIT SBBR_L_SIZE
116 #define PROD_CONS_MASK PROD_CONS_PTR_4K
118 #define TOTAL_RING_BUF_SIZE (RING_BUF_SIZE * 4)
120 /* driver specific - one per card */
121 struct ioc3_card {
122 struct {
123 /* uart ports are allocated here */
124 struct uart_port icp_uart_port[LOGICAL_PORTS];
125 /* the ioc3_port used for this port */
126 struct ioc3_port *icp_port;
127 } ic_port[PORTS_PER_CARD];
128 /* currently enabled interrupts */
129 uint32_t ic_enable;
130 };
132 /* Local port info for each IOC3 serial port */
133 struct ioc3_port {
134 /* handy reference material */
135 struct uart_port *ip_port;
136 struct ioc3_card *ip_card;
137 struct ioc3_driver_data *ip_idd;
138 struct ioc3_submodule *ip_is;
140 /* pci mem addresses for this port */
141 struct ioc3_serialregs __iomem *ip_serial_regs;
142 struct ioc3_uartregs __iomem *ip_uart_regs;
144 /* Ring buffer page for this port */
145 dma_addr_t ip_dma_ringbuf;
146 /* vaddr of ring buffer */
147 struct ring_buffer *ip_cpu_ringbuf;
149 /* Rings for this port */
150 struct ring *ip_inring;
151 struct ring *ip_outring;
153 /* Hook to port specific values */
154 struct port_hooks *ip_hooks;
156 spinlock_t ip_lock;
158 /* Various rx/tx parameters */
159 int ip_baud;
160 int ip_tx_lowat;
161 int ip_rx_timeout;
163 /* Copy of notification bits */
164 int ip_notify;
166 /* Shadow copies of various registers so we don't need to PIO
167 * read them constantly
168 */
169 uint32_t ip_sscr;
170 uint32_t ip_tx_prod;
171 uint32_t ip_rx_cons;
172 unsigned char ip_flags;
173 };
175 /* tx low water mark. We need to notify the driver whenever tx is getting
176 * close to empty so it can refill the tx buffer and keep things going.
177 * Let's assume that if we interrupt 1 ms before the tx goes idle, we'll
178 * have no trouble getting in more chars in time (I certainly hope so).
179 */
180 #define TX_LOWAT_LATENCY 1000
181 #define TX_LOWAT_HZ (1000000 / TX_LOWAT_LATENCY)
182 #define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ)
184 /* Flags per port */
185 #define INPUT_HIGH 0x01
186 /* used to signify that we have turned off the rx_high
187 * temporarily - we need to drain the fifo and don't
188 * want to get blasted with interrupts.
189 */
190 #define DCD_ON 0x02
191 /* DCD state is on */
192 #define LOWAT_WRITTEN 0x04
193 #define READ_ABORTED 0x08
194 /* the read was aborted - used to avaoid infinate looping
195 * in the interrupt handler
196 */
197 #define INPUT_ENABLE 0x10
199 /* Since each port has different register offsets and bitmasks
200 * for everything, we'll store those that we need in tables so we
201 * don't have to be constantly checking the port we are dealing with.
202 */
203 struct port_hooks {
204 uint32_t intr_delta_dcd;
205 uint32_t intr_delta_cts;
206 uint32_t intr_tx_mt;
207 uint32_t intr_rx_timer;
208 uint32_t intr_rx_high;
209 uint32_t intr_tx_explicit;
210 uint32_t intr_clear;
211 uint32_t intr_all;
212 char rs422_select_pin;
213 };
215 static struct port_hooks hooks_array[PORTS_PER_CARD] = {
216 /* values for port A */
217 {
218 .intr_delta_dcd = SIO_IR_SA_DELTA_DCD,
219 .intr_delta_cts = SIO_IR_SA_DELTA_CTS,
220 .intr_tx_mt = SIO_IR_SA_TX_MT,
221 .intr_rx_timer = SIO_IR_SA_RX_TIMER,
222 .intr_rx_high = SIO_IR_SA_RX_HIGH,
223 .intr_tx_explicit = SIO_IR_SA_TX_EXPLICIT,
224 .intr_clear = (SIO_IR_SA_TX_MT | SIO_IR_SA_RX_FULL
225 | SIO_IR_SA_RX_HIGH
226 | SIO_IR_SA_RX_TIMER
227 | SIO_IR_SA_DELTA_DCD
228 | SIO_IR_SA_DELTA_CTS
229 | SIO_IR_SA_INT
230 | SIO_IR_SA_TX_EXPLICIT
231 | SIO_IR_SA_MEMERR),
232 .intr_all = SIO_IR_SA,
233 .rs422_select_pin = GPPR_UARTA_MODESEL_PIN,
234 },
236 /* values for port B */
237 {
238 .intr_delta_dcd = SIO_IR_SB_DELTA_DCD,
239 .intr_delta_cts = SIO_IR_SB_DELTA_CTS,
240 .intr_tx_mt = SIO_IR_SB_TX_MT,
241 .intr_rx_timer = SIO_IR_SB_RX_TIMER,
242 .intr_rx_high = SIO_IR_SB_RX_HIGH,
243 .intr_tx_explicit = SIO_IR_SB_TX_EXPLICIT,
244 .intr_clear = (SIO_IR_SB_TX_MT | SIO_IR_SB_RX_FULL
245 | SIO_IR_SB_RX_HIGH
246 | SIO_IR_SB_RX_TIMER
247 | SIO_IR_SB_DELTA_DCD
248 | SIO_IR_SB_DELTA_CTS
249 | SIO_IR_SB_INT
250 | SIO_IR_SB_TX_EXPLICIT
251 | SIO_IR_SB_MEMERR),
252 .intr_all = SIO_IR_SB,
253 .rs422_select_pin = GPPR_UARTB_MODESEL_PIN,
254 }
255 };
257 struct ring_entry {
258 union {
259 struct {
260 uint32_t alldata;
261 uint32_t allsc;
262 } all;
263 struct {
264 char data[4]; /* data bytes */
265 char sc[4]; /* status/control */
266 } s;
267 } u;
268 };
270 /* Test the valid bits in any of the 4 sc chars using "allsc" member */
271 #define RING_ANY_VALID \
272 ((uint32_t)(RXSB_MODEM_VALID | RXSB_DATA_VALID) * 0x01010101)
274 #define ring_sc u.s.sc
275 #define ring_data u.s.data
276 #define ring_allsc u.all.allsc
278 /* Number of entries per ring buffer. */
279 #define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry))
281 /* An individual ring */
282 struct ring {
283 struct ring_entry entries[ENTRIES_PER_RING];
284 };
286 /* The whole enchilada */
287 struct ring_buffer {
288 struct ring TX_A;
289 struct ring RX_A;
290 struct ring TX_B;
291 struct ring RX_B;
292 };
294 /* Get a ring from a port struct */
295 #define RING(_p, _wh) &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh)
297 /* for Infinite loop detection */
298 #define MAXITER 10000000
301 /**
302 * set_baud - Baud rate setting code
303 * @port: port to set
304 * @baud: baud rate to use
305 */
306 static int set_baud(struct ioc3_port *port, int baud)
307 {
308 int divisor;
309 int actual_baud;
310 int diff;
311 int lcr, prediv;
312 struct ioc3_uartregs __iomem *uart;
314 for (prediv = 6; prediv < 64; prediv++) {
315 divisor = SER_DIVISOR(baud, SER_CLK_SPEED(prediv));
316 if (!divisor)
317 continue; /* invalid divisor */
318 actual_baud = DIVISOR_TO_BAUD(divisor, SER_CLK_SPEED(prediv));
320 diff = actual_baud - baud;
321 if (diff < 0)
322 diff = -diff;
324 /* if we're within 1% we've found a match */
325 if (diff * 100 <= actual_baud)
326 break;
327 }
329 /* if the above loop completed, we didn't match
330 * the baud rate. give up.
331 */
332 if (prediv == 64) {
333 NOT_PROGRESS();
334 return 1;
335 }
337 uart = port->ip_uart_regs;
338 lcr = readb(&uart->iu_lcr);
340 writeb(lcr | UART_LCR_DLAB, &uart->iu_lcr);
341 writeb((unsigned char)divisor, &uart->iu_dll);
342 writeb((unsigned char)(divisor >> 8), &uart->iu_dlm);
343 writeb((unsigned char)prediv, &uart->iu_scr);
344 writeb((unsigned char)lcr, &uart->iu_lcr);
346 return 0;
347 }
349 /**
350 * get_ioc3_port - given a uart port, return the control structure
351 * @the_port: uart port to find
352 */
353 static struct ioc3_port *get_ioc3_port(struct uart_port *the_port)
354 {
355 struct ioc3_driver_data *idd = dev_get_drvdata(the_port->dev);
356 struct ioc3_card *card_ptr = idd->data[Submodule_slot];
357 int ii, jj;
359 if (!card_ptr) {
360 NOT_PROGRESS();
361 return NULL;
362 }
363 for (ii = 0; ii < PORTS_PER_CARD; ii++) {
364 for (jj = 0; jj < LOGICAL_PORTS; jj++) {
365 if (the_port == &card_ptr->ic_port[ii].icp_uart_port[jj])
366 return card_ptr->ic_port[ii].icp_port;
367 }
368 }
369 NOT_PROGRESS();
370 return NULL;
371 }
373 /**
374 * port_init - Initialize the sio and ioc3 hardware for a given port
375 * called per port from attach...
376 * @port: port to initialize
377 */
378 static int inline port_init(struct ioc3_port *port)
379 {
380 uint32_t sio_cr;
381 struct port_hooks *hooks = port->ip_hooks;
382 struct ioc3_uartregs __iomem *uart;
383 int reset_loop_counter = 0xfffff;
384 struct ioc3_driver_data *idd = port->ip_idd;
386 /* Idle the IOC3 serial interface */
387 writel(SSCR_RESET, &port->ip_serial_regs->sscr);
389 /* Wait until any pending bus activity for this port has ceased */
390 do {
391 sio_cr = readl(&idd->vma->sio_cr);
392 if (reset_loop_counter-- <= 0) {
393 printk(KERN_WARNING
394 "IOC3 unable to come out of reset"
395 " scr 0x%x\n", sio_cr);
396 return -1;
397 }
398 } while (!(sio_cr & SIO_CR_ARB_DIAG_IDLE) &&
399 (((sio_cr &= SIO_CR_ARB_DIAG) == SIO_CR_ARB_DIAG_TXA)
400 || sio_cr == SIO_CR_ARB_DIAG_TXB
401 || sio_cr == SIO_CR_ARB_DIAG_RXA
402 || sio_cr == SIO_CR_ARB_DIAG_RXB));
404 /* Finish reset sequence */
405 writel(0, &port->ip_serial_regs->sscr);
407 /* Once RESET is done, reload cached tx_prod and rx_cons values
408 * and set rings to empty by making prod == cons
409 */
410 port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
411 writel(port->ip_tx_prod, &port->ip_serial_regs->stpir);
412 port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
413 writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir);
415 /* Disable interrupts for this 16550 */
416 uart = port->ip_uart_regs;
417 writeb(0, &uart->iu_lcr);
418 writeb(0, &uart->iu_ier);
420 /* Set the default baud */
421 set_baud(port, port->ip_baud);
423 /* Set line control to 8 bits no parity */
424 writeb(UART_LCR_WLEN8 | 0, &uart->iu_lcr);
425 /* UART_LCR_STOP == 1 stop */
427 /* Enable the FIFOs */
428 writeb(UART_FCR_ENABLE_FIFO, &uart->iu_fcr);
429 /* then reset 16550 FIFOs */
430 writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
431 &uart->iu_fcr);
433 /* Clear modem control register */
434 writeb(0, &uart->iu_mcr);
436 /* Clear deltas in modem status register */
437 writel(0, &port->ip_serial_regs->shadow);
439 /* Only do this once per port pair */
440 if (port->ip_hooks == &hooks_array[0]) {
441 unsigned long ring_pci_addr;
442 uint32_t __iomem *sbbr_l, *sbbr_h;
444 sbbr_l = &idd->vma->sbbr_l;
445 sbbr_h = &idd->vma->sbbr_h;
446 ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf;
447 DPRINT_CONFIG(("%s: ring_pci_addr 0x%p\n",
448 __FUNCTION__, (void *)ring_pci_addr));
450 writel((unsigned int)((uint64_t) ring_pci_addr >> 32), sbbr_h);
451 writel((unsigned int)ring_pci_addr | BUF_SIZE_BIT, sbbr_l);
452 }
454 /* Set the receive timeout value to 10 msec */
455 writel(SRTR_HZ / 100, &port->ip_serial_regs->srtr);
457 /* Set rx threshold, enable DMA */
458 /* Set high water mark at 3/4 of full ring */
459 port->ip_sscr = (ENTRIES_PER_RING * 3 / 4);
461 /* uart experiences pauses at high baud rate reducing actual
462 * throughput by 10% or so unless we enable high speed polling
463 * XXX when this hardware bug is resolved we should revert to
464 * normal polling speed
465 */
466 port->ip_sscr |= SSCR_HIGH_SPD;
468 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
470 /* Disable and clear all serial related interrupt bits */
471 port->ip_card->ic_enable &= ~hooks->intr_clear;
472 ioc3_disable(port->ip_is, idd, hooks->intr_clear);
473 ioc3_ack(port->ip_is, idd, hooks->intr_clear);
474 return 0;
475 }
477 /**
478 * enable_intrs - enable interrupts
479 * @port: port to enable
480 * @mask: mask to use
481 */
482 static void enable_intrs(struct ioc3_port *port, uint32_t mask)
483 {
484 if ((port->ip_card->ic_enable & mask) != mask) {
485 port->ip_card->ic_enable |= mask;
486 ioc3_enable(port->ip_is, port->ip_idd, mask);
487 }
488 }
490 /**
491 * local_open - local open a port
492 * @port: port to open
493 */
494 static inline int local_open(struct ioc3_port *port)
495 {
496 int spiniter = 0;
498 port->ip_flags = INPUT_ENABLE;
500 /* Pause the DMA interface if necessary */
501 if (port->ip_sscr & SSCR_DMA_EN) {
502 writel(port->ip_sscr | SSCR_DMA_PAUSE,
503 &port->ip_serial_regs->sscr);
504 while ((readl(&port->ip_serial_regs->sscr)
505 & SSCR_PAUSE_STATE) == 0) {
506 spiniter++;
507 if (spiniter > MAXITER) {
508 NOT_PROGRESS();
509 return -1;
510 }
511 }
512 }
514 /* Reset the input fifo. If the uart received chars while the port
515 * was closed and DMA is not enabled, the uart may have a bunch of
516 * chars hanging around in its rx fifo which will not be discarded
517 * by rclr in the upper layer. We must get rid of them here.
518 */
519 writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR,
520 &port->ip_uart_regs->iu_fcr);
522 writeb(UART_LCR_WLEN8, &port->ip_uart_regs->iu_lcr);
523 /* UART_LCR_STOP == 1 stop */
525 /* Re-enable DMA, set default threshold to intr whenever there is
526 * data available.
527 */
528 port->ip_sscr &= ~SSCR_RX_THRESHOLD;
529 port->ip_sscr |= 1; /* default threshold */
531 /* Plug in the new sscr. This implicitly clears the DMA_PAUSE
532 * flag if it was set above
533 */
534 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
535 port->ip_tx_lowat = 1;
536 return 0;
537 }
539 /**
540 * set_rx_timeout - Set rx timeout and threshold values.
541 * @port: port to use
542 * @timeout: timeout value in ticks
543 */
544 static inline int set_rx_timeout(struct ioc3_port *port, int timeout)
545 {
546 int threshold;
548 port->ip_rx_timeout = timeout;
550 /* Timeout is in ticks. Let's figure out how many chars we
551 * can receive at the current baud rate in that interval
552 * and set the rx threshold to that amount. There are 4 chars
553 * per ring entry, so we'll divide the number of chars that will
554 * arrive in timeout by 4.
555 * So .... timeout * baud / 10 / HZ / 4, with HZ = 100.
556 */
557 threshold = timeout * port->ip_baud / 4000;
558 if (threshold == 0)
559 threshold = 1; /* otherwise we'll intr all the time! */
561 if ((unsigned)threshold > (unsigned)SSCR_RX_THRESHOLD)
562 return 1;
564 port->ip_sscr &= ~SSCR_RX_THRESHOLD;
565 port->ip_sscr |= threshold;
566 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
568 /* Now set the rx timeout to the given value
569 * again timeout * SRTR_HZ / HZ
570 */
571 timeout = timeout * SRTR_HZ / 100;
572 if (timeout > SRTR_CNT)
573 timeout = SRTR_CNT;
574 writel(timeout, &port->ip_serial_regs->srtr);
575 return 0;
576 }
578 /**
579 * config_port - config the hardware
580 * @port: port to config
581 * @baud: baud rate for the port
582 * @byte_size: data size
583 * @stop_bits: number of stop bits
584 * @parenb: parity enable ?
585 * @parodd: odd parity ?
586 */
587 static inline int
588 config_port(struct ioc3_port *port,
589 int baud, int byte_size, int stop_bits, int parenb, int parodd)
590 {
591 char lcr, sizebits;
592 int spiniter = 0;
594 DPRINT_CONFIG(("%s: line %d baud %d byte_size %d stop %d parenb %d "
595 "parodd %d\n",
596 __FUNCTION__, ((struct uart_port *)port->ip_port)->line,
597 baud, byte_size, stop_bits, parenb, parodd));
599 if (set_baud(port, baud))
600 return 1;
602 switch (byte_size) {
603 case 5:
604 sizebits = UART_LCR_WLEN5;
605 break;
606 case 6:
607 sizebits = UART_LCR_WLEN6;
608 break;
609 case 7:
610 sizebits = UART_LCR_WLEN7;
611 break;
612 case 8:
613 sizebits = UART_LCR_WLEN8;
614 break;
615 default:
616 return 1;
617 }
619 /* Pause the DMA interface if necessary */
620 if (port->ip_sscr & SSCR_DMA_EN) {
621 writel(port->ip_sscr | SSCR_DMA_PAUSE,
622 &port->ip_serial_regs->sscr);
623 while ((readl(&port->ip_serial_regs->sscr)
624 & SSCR_PAUSE_STATE) == 0) {
625 spiniter++;
626 if (spiniter > MAXITER)
627 return -1;
628 }
629 }
631 /* Clear relevant fields in lcr */
632 lcr = readb(&port->ip_uart_regs->iu_lcr);
633 lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR |
634 UART_LCR_PARITY | LCR_MASK_STOP_BITS);
636 /* Set byte size in lcr */
637 lcr |= sizebits;
639 /* Set parity */
640 if (parenb) {
641 lcr |= UART_LCR_PARITY;
642 if (!parodd)
643 lcr |= UART_LCR_EPAR;
644 }
646 /* Set stop bits */
647 if (stop_bits)
648 lcr |= UART_LCR_STOP /* 2 stop bits */ ;
650 writeb(lcr, &port->ip_uart_regs->iu_lcr);
652 /* Re-enable the DMA interface if necessary */
653 if (port->ip_sscr & SSCR_DMA_EN) {
654 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
655 }
656 port->ip_baud = baud;
658 /* When we get within this number of ring entries of filling the
659 * entire ring on tx, place an EXPLICIT intr to generate a lowat
660 * notification when output has drained.
661 */
662 port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4;
663 if (port->ip_tx_lowat == 0)
664 port->ip_tx_lowat = 1;
666 set_rx_timeout(port, 2);
667 return 0;
668 }
670 /**
671 * do_write - Write bytes to the port. Returns the number of bytes
672 * actually written. Called from transmit_chars
673 * @port: port to use
674 * @buf: the stuff to write
675 * @len: how many bytes in 'buf'
676 */
677 static inline int do_write(struct ioc3_port *port, char *buf, int len)
678 {
679 int prod_ptr, cons_ptr, total = 0;
680 struct ring *outring;
681 struct ring_entry *entry;
682 struct port_hooks *hooks = port->ip_hooks;
684 BUG_ON(!(len >= 0));
686 prod_ptr = port->ip_tx_prod;
687 cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
688 outring = port->ip_outring;
690 /* Maintain a 1-entry red-zone. The ring buffer is full when
691 * (cons - prod) % ring_size is 1. Rather than do this subtraction
692 * in the body of the loop, I'll do it now.
693 */
694 cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK;
696 /* Stuff the bytes into the output */
697 while ((prod_ptr != cons_ptr) && (len > 0)) {
698 int xx;
700 /* Get 4 bytes (one ring entry) at a time */
701 entry = (struct ring_entry *)((caddr_t) outring + prod_ptr);
703 /* Invalidate all entries */
704 entry->ring_allsc = 0;
706 /* Copy in some bytes */
707 for (xx = 0; (xx < 4) && (len > 0); xx++) {
708 entry->ring_data[xx] = *buf++;
709 entry->ring_sc[xx] = TXCB_VALID;
710 len--;
711 total++;
712 }
714 /* If we are within some small threshold of filling up the
715 * entire ring buffer, we must place an EXPLICIT intr here
716 * to generate a lowat interrupt in case we subsequently
717 * really do fill up the ring and the caller goes to sleep.
718 * No need to place more than one though.
719 */
720 if (!(port->ip_flags & LOWAT_WRITTEN) &&
721 ((cons_ptr - prod_ptr) & PROD_CONS_MASK)
722 <= port->ip_tx_lowat * (int)sizeof(struct ring_entry)) {
723 port->ip_flags |= LOWAT_WRITTEN;
724 entry->ring_sc[0] |= TXCB_INT_WHEN_DONE;
725 }
727 /* Go on to next entry */
728 prod_ptr += sizeof(struct ring_entry);
729 prod_ptr &= PROD_CONS_MASK;
730 }
732 /* If we sent something, start DMA if necessary */
733 if (total > 0 && !(port->ip_sscr & SSCR_DMA_EN)) {
734 port->ip_sscr |= SSCR_DMA_EN;
735 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
736 }
738 /* Store the new producer pointer. If tx is disabled, we stuff the
739 * data into the ring buffer, but we don't actually start tx.
740 */
741 if (!uart_tx_stopped(port->ip_port)) {
742 writel(prod_ptr, &port->ip_serial_regs->stpir);
744 /* If we are now transmitting, enable tx_mt interrupt so we
745 * can disable DMA if necessary when the tx finishes.
746 */
747 if (total > 0)
748 enable_intrs(port, hooks->intr_tx_mt);
749 }
750 port->ip_tx_prod = prod_ptr;
752 return total;
753 }
755 /**
756 * disable_intrs - disable interrupts
757 * @port: port to enable
758 * @mask: mask to use
759 */
760 static inline void disable_intrs(struct ioc3_port *port, uint32_t mask)
761 {
762 if (port->ip_card->ic_enable & mask) {
763 ioc3_disable(port->ip_is, port->ip_idd, mask);
764 port->ip_card->ic_enable &= ~mask;
765 }
766 }
768 /**
769 * set_notification - Modify event notification
770 * @port: port to use
771 * @mask: events mask
772 * @set_on: set ?
773 */
774 static int set_notification(struct ioc3_port *port, int mask, int set_on)
775 {
776 struct port_hooks *hooks = port->ip_hooks;
777 uint32_t intrbits, sscrbits;
779 BUG_ON(!mask);
781 intrbits = sscrbits = 0;
783 if (mask & N_DATA_READY)
784 intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high);
785 if (mask & N_OUTPUT_LOWAT)
786 intrbits |= hooks->intr_tx_explicit;
787 if (mask & N_DDCD) {
788 intrbits |= hooks->intr_delta_dcd;
789 sscrbits |= SSCR_RX_RING_DCD;
790 }
791 if (mask & N_DCTS)
792 intrbits |= hooks->intr_delta_cts;
794 if (set_on) {
795 enable_intrs(port, intrbits);
796 port->ip_notify |= mask;
797 port->ip_sscr |= sscrbits;
798 } else {
799 disable_intrs(port, intrbits);
800 port->ip_notify &= ~mask;
801 port->ip_sscr &= ~sscrbits;
802 }
804 /* We require DMA if either DATA_READY or DDCD notification is
805 * currently requested. If neither of these is requested and
806 * there is currently no tx in progress, DMA may be disabled.
807 */
808 if (port->ip_notify & (N_DATA_READY | N_DDCD))
809 port->ip_sscr |= SSCR_DMA_EN;
810 else if (!(port->ip_card->ic_enable & hooks->intr_tx_mt))
811 port->ip_sscr &= ~SSCR_DMA_EN;
813 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
814 return 0;
815 }
817 /**
818 * set_mcr - set the master control reg
819 * @the_port: port to use
820 * @mask1: mcr mask
821 * @mask2: shadow mask
822 */
823 static inline int set_mcr(struct uart_port *the_port,
824 int mask1, int mask2)
825 {
826 struct ioc3_port *port = get_ioc3_port(the_port);
827 uint32_t shadow;
828 int spiniter = 0;
829 char mcr;
831 if (!port)
832 return -1;
834 /* Pause the DMA interface if necessary */
835 if (port->ip_sscr & SSCR_DMA_EN) {
836 writel(port->ip_sscr | SSCR_DMA_PAUSE,
837 &port->ip_serial_regs->sscr);
838 while ((readl(&port->ip_serial_regs->sscr)
839 & SSCR_PAUSE_STATE) == 0) {
840 spiniter++;
841 if (spiniter > MAXITER)
842 return -1;
843 }
844 }
845 shadow = readl(&port->ip_serial_regs->shadow);
846 mcr = (shadow & 0xff000000) >> 24;
848 /* Set new value */
849 mcr |= mask1;
850 shadow |= mask2;
851 writeb(mcr, &port->ip_uart_regs->iu_mcr);
852 writel(shadow, &port->ip_serial_regs->shadow);
854 /* Re-enable the DMA interface if necessary */
855 if (port->ip_sscr & SSCR_DMA_EN) {
856 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
857 }
858 return 0;
859 }
861 /**
862 * ioc3_set_proto - set the protocol for the port
863 * @port: port to use
864 * @proto: protocol to use
865 */
866 static int ioc3_set_proto(struct ioc3_port *port, int proto)
867 {
868 struct port_hooks *hooks = port->ip_hooks;
870 switch (proto) {
871 default:
872 case PROTO_RS232:
873 /* Clear the appropriate GIO pin */
874 DPRINT_CONFIG(("%s: rs232\n", __FUNCTION__));
875 writel(0, (&port->ip_idd->vma->gppr[0]
876 + hooks->rs422_select_pin));
877 break;
879 case PROTO_RS422:
880 /* Set the appropriate GIO pin */
881 DPRINT_CONFIG(("%s: rs422\n", __FUNCTION__));
882 writel(1, (&port->ip_idd->vma->gppr[0]
883 + hooks->rs422_select_pin));
884 break;
885 }
886 return 0;
887 }
889 /**
890 * transmit_chars - upper level write, called with the_port->lock
891 * @the_port: port to write
892 */
893 static void transmit_chars(struct uart_port *the_port)
894 {
895 int xmit_count, tail, head;
896 int result;
897 char *start;
898 struct tty_struct *tty;
899 struct ioc3_port *port = get_ioc3_port(the_port);
900 struct uart_info *info;
902 if (!the_port)
903 return;
904 if (!port)
905 return;
907 info = the_port->info;
908 tty = info->tty;
910 if (uart_circ_empty(&info->xmit) || uart_tx_stopped(the_port)) {
911 /* Nothing to do or hw stopped */
912 set_notification(port, N_ALL_OUTPUT, 0);
913 return;
914 }
916 head = info->xmit.head;
917 tail = info->xmit.tail;
918 start = (char *)&info->xmit.buf[tail];
920 /* write out all the data or until the end of the buffer */
921 xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail);
922 if (xmit_count > 0) {
923 result = do_write(port, start, xmit_count);
924 if (result > 0) {
925 /* booking */
926 xmit_count -= result;
927 the_port->icount.tx += result;
928 /* advance the pointers */
929 tail += result;
930 tail &= UART_XMIT_SIZE - 1;
931 info->xmit.tail = tail;
932 start = (char *)&info->xmit.buf[tail];
933 }
934 }
935 if (uart_circ_chars_pending(&info->xmit) < WAKEUP_CHARS)
936 uart_write_wakeup(the_port);
938 if (uart_circ_empty(&info->xmit)) {
939 set_notification(port, N_OUTPUT_LOWAT, 0);
940 } else {
941 set_notification(port, N_OUTPUT_LOWAT, 1);
942 }
943 }
945 /**
946 * ioc3_change_speed - change the speed of the port
947 * @the_port: port to change
948 * @new_termios: new termios settings
949 * @old_termios: old termios settings
950 */
951 static void
952 ioc3_change_speed(struct uart_port *the_port,
953 struct termios *new_termios, struct termios *old_termios)
954 {
955 struct ioc3_port *port = get_ioc3_port(the_port);
956 unsigned int cflag;
957 int baud;
958 int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
959 struct uart_info *info = the_port->info;
961 cflag = new_termios->c_cflag;
963 switch (cflag & CSIZE) {
964 case CS5:
965 new_data = 5;
966 break;
967 case CS6:
968 new_data = 6;
969 break;
970 case CS7:
971 new_data = 7;
972 break;
973 case CS8:
974 new_data = 8;
975 break;
976 default:
977 /* cuz we always need a default ... */
978 new_data = 5;
979 break;
980 }
981 if (cflag & CSTOPB) {
982 new_stop = 1;
983 }
984 if (cflag & PARENB) {
985 new_parity_enable = 1;
986 if (cflag & PARODD)
987 new_parity = 1;
988 }
989 baud = uart_get_baud_rate(the_port, new_termios, old_termios,
990 MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED);
991 DPRINT_CONFIG(("%s: returned baud %d for line %d\n", __FUNCTION__, baud,
992 the_port->line));
994 if (!the_port->fifosize)
995 the_port->fifosize = FIFO_SIZE;
996 uart_update_timeout(the_port, cflag, baud);
998 the_port->ignore_status_mask = N_ALL_INPUT;
1000 info->tty->low_latency = 1;
1002 if (I_IGNPAR(info->tty))
1003 the_port->ignore_status_mask &= ~(N_PARITY_ERROR
1004 | N_FRAMING_ERROR);
1005 if (I_IGNBRK(info->tty)) {
1006 the_port->ignore_status_mask &= ~N_BREAK;
1007 if (I_IGNPAR(info->tty))
1008 the_port->ignore_status_mask &= ~N_OVERRUN_ERROR;
1010 if (!(cflag & CREAD)) {
1011 /* ignore everything */
1012 the_port->ignore_status_mask &= ~N_DATA_READY;
1015 if (cflag & CRTSCTS) {
1016 /* enable hardware flow control */
1017 port->ip_sscr |= SSCR_HFC_EN;
1019 else {
1020 /* disable hardware flow control */
1021 port->ip_sscr &= ~SSCR_HFC_EN;
1023 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
1025 /* Set the configuration and proper notification call */
1026 DPRINT_CONFIG(("%s : port 0x%p line %d cflag 0%o "
1027 "config_port(baud %d data %d stop %d penable %d "
1028 " parity %d), notification 0x%x\n",
1029 __FUNCTION__, (void *)port, the_port->line, cflag, baud,
1030 new_data, new_stop, new_parity_enable, new_parity,
1031 the_port->ignore_status_mask));
1033 if ((config_port(port, baud, /* baud */
1034 new_data, /* byte size */
1035 new_stop, /* stop bits */
1036 new_parity_enable, /* set parity */
1037 new_parity)) >= 0) { /* parity 1==odd */
1038 set_notification(port, the_port->ignore_status_mask, 1);
1042 /**
1043 * ic3_startup_local - Start up the serial port - returns >= 0 if no errors
1044 * @the_port: Port to operate on
1045 */
1046 static inline int ic3_startup_local(struct uart_port *the_port)
1048 struct ioc3_port *port;
1050 if (!the_port) {
1051 NOT_PROGRESS();
1052 return -1;
1055 port = get_ioc3_port(the_port);
1056 if (!port) {
1057 NOT_PROGRESS();
1058 return -1;
1061 local_open(port);
1063 /* set the protocol */
1064 ioc3_set_proto(port, IS_RS232(the_port->line) ? PROTO_RS232 :
1065 PROTO_RS422);
1066 return 0;
1069 /*
1070 * ioc3_cb_output_lowat - called when the output low water mark is hit
1071 * @port: port to output
1072 */
1073 static void ioc3_cb_output_lowat(struct ioc3_port *port)
1075 unsigned long pflags;
1077 /* the_port->lock is set on the call here */
1078 if (port->ip_port) {
1079 spin_lock_irqsave(&port->ip_port->lock, pflags);
1080 transmit_chars(port->ip_port);
1081 spin_unlock_irqrestore(&port->ip_port->lock, pflags);
1085 /*
1086 * ioc3_cb_post_ncs - called for some basic errors
1087 * @port: port to use
1088 * @ncs: event
1089 */
1090 static void ioc3_cb_post_ncs(struct uart_port *the_port, int ncs)
1092 struct uart_icount *icount;
1094 icount = &the_port->icount;
1096 if (ncs & NCS_BREAK)
1097 icount->brk++;
1098 if (ncs & NCS_FRAMING)
1099 icount->frame++;
1100 if (ncs & NCS_OVERRUN)
1101 icount->overrun++;
1102 if (ncs & NCS_PARITY)
1103 icount->parity++;
1106 /**
1107 * do_read - Read in bytes from the port. Return the number of bytes
1108 * actually read.
1109 * @the_port: port to use
1110 * @buf: place to put the stuff we read
1111 * @len: how big 'buf' is
1112 */
1114 static inline int do_read(struct uart_port *the_port, char *buf, int len)
1116 int prod_ptr, cons_ptr, total;
1117 struct ioc3_port *port = get_ioc3_port(the_port);
1118 struct ring *inring;
1119 struct ring_entry *entry;
1120 struct port_hooks *hooks = port->ip_hooks;
1121 int byte_num;
1122 char *sc;
1123 int loop_counter;
1125 BUG_ON(!(len >= 0));
1126 BUG_ON(!port);
1128 /* There is a nasty timing issue in the IOC3. When the rx_timer
1129 * expires or the rx_high condition arises, we take an interrupt.
1130 * At some point while servicing the interrupt, we read bytes from
1131 * the ring buffer and re-arm the rx_timer. However the rx_timer is
1132 * not started until the first byte is received *after* it is armed,
1133 * and any bytes pending in the rx construction buffers are not drained
1134 * to memory until either there are 4 bytes available or the rx_timer
1135 * expires. This leads to a potential situation where data is left
1136 * in the construction buffers forever - 1 to 3 bytes were received
1137 * after the interrupt was generated but before the rx_timer was
1138 * re-armed. At that point as long as no subsequent bytes are received
1139 * the timer will never be started and the bytes will remain in the
1140 * construction buffer forever. The solution is to execute a DRAIN
1141 * command after rearming the timer. This way any bytes received before
1142 * the DRAIN will be drained to memory, and any bytes received after
1143 * the DRAIN will start the TIMER and be drained when it expires.
1144 * Luckily, this only needs to be done when the DMA buffer is empty
1145 * since there is no requirement that this function return all
1146 * available data as long as it returns some.
1147 */
1148 /* Re-arm the timer */
1150 writel(port->ip_rx_cons | SRCIR_ARM, &port->ip_serial_regs->srcir);
1152 prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
1153 cons_ptr = port->ip_rx_cons;
1155 if (prod_ptr == cons_ptr) {
1156 int reset_dma = 0;
1158 /* Input buffer appears empty, do a flush. */
1160 /* DMA must be enabled for this to work. */
1161 if (!(port->ip_sscr & SSCR_DMA_EN)) {
1162 port->ip_sscr |= SSCR_DMA_EN;
1163 reset_dma = 1;
1166 /* Potential race condition: we must reload the srpir after
1167 * issuing the drain command, otherwise we could think the rx
1168 * buffer is empty, then take a very long interrupt, and when
1169 * we come back it's full and we wait forever for the drain to
1170 * complete.
1171 */
1172 writel(port->ip_sscr | SSCR_RX_DRAIN,
1173 &port->ip_serial_regs->sscr);
1174 prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
1176 /* We must not wait for the DRAIN to complete unless there are
1177 * at least 8 bytes (2 ring entries) available to receive the
1178 * data otherwise the DRAIN will never complete and we'll
1179 * deadlock here.
1180 * In fact, to make things easier, I'll just ignore the flush if
1181 * there is any data at all now available.
1182 */
1183 if (prod_ptr == cons_ptr) {
1184 loop_counter = 0;
1185 while (readl(&port->ip_serial_regs->sscr) &
1186 SSCR_RX_DRAIN) {
1187 loop_counter++;
1188 if (loop_counter > MAXITER)
1189 return -1;
1192 /* SIGH. We have to reload the prod_ptr *again* since
1193 * the drain may have caused it to change
1194 */
1195 prod_ptr = readl(&port->ip_serial_regs->srpir)
1196 & PROD_CONS_MASK;
1198 if (reset_dma) {
1199 port->ip_sscr &= ~SSCR_DMA_EN;
1200 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
1203 inring = port->ip_inring;
1204 port->ip_flags &= ~READ_ABORTED;
1206 total = 0;
1207 loop_counter = 0xfffff; /* to avoid hangs */
1209 /* Grab bytes from the hardware */
1210 while ((prod_ptr != cons_ptr) && (len > 0)) {
1211 entry = (struct ring_entry *)((caddr_t) inring + cons_ptr);
1213 if (loop_counter-- <= 0) {
1214 printk(KERN_WARNING "IOC3 serial: "
1215 "possible hang condition/"
1216 "port stuck on read (line %d).\n",
1217 the_port->line);
1218 break;
1221 /* According to the producer pointer, this ring entry
1222 * must contain some data. But if the PIO happened faster
1223 * than the DMA, the data may not be available yet, so let's
1224 * wait until it arrives.
1225 */
1226 if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
1227 /* Indicate the read is aborted so we don't disable
1228 * the interrupt thinking that the consumer is
1229 * congested.
1230 */
1231 port->ip_flags |= READ_ABORTED;
1232 len = 0;
1233 break;
1236 /* Load the bytes/status out of the ring entry */
1237 for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) {
1238 sc = &(entry->ring_sc[byte_num]);
1240 /* Check for change in modem state or overrun */
1241 if ((*sc & RXSB_MODEM_VALID)
1242 && (port->ip_notify & N_DDCD)) {
1243 /* Notify upper layer if DCD dropped */
1244 if ((port->ip_flags & DCD_ON)
1245 && !(*sc & RXSB_DCD)) {
1246 /* If we have already copied some data,
1247 * return it. We'll pick up the carrier
1248 * drop on the next pass. That way we
1249 * don't throw away the data that has
1250 * already been copied back to
1251 * the caller's buffer.
1252 */
1253 if (total > 0) {
1254 len = 0;
1255 break;
1257 port->ip_flags &= ~DCD_ON;
1259 /* Turn off this notification so the
1260 * carrier drop protocol won't see it
1261 * again when it does a read.
1262 */
1263 *sc &= ~RXSB_MODEM_VALID;
1265 /* To keep things consistent, we need
1266 * to update the consumer pointer so
1267 * the next reader won't come in and
1268 * try to read the same ring entries
1269 * again. This must be done here before
1270 * the dcd change.
1271 */
1273 if ((entry->ring_allsc & RING_ANY_VALID)
1274 == 0) {
1275 cons_ptr += (int)sizeof
1276 (struct ring_entry);
1277 cons_ptr &= PROD_CONS_MASK;
1279 writel(cons_ptr,
1280 &port->ip_serial_regs->srcir);
1281 port->ip_rx_cons = cons_ptr;
1283 /* Notify upper layer of carrier drop */
1284 if ((port->ip_notify & N_DDCD)
1285 && port->ip_port) {
1286 uart_handle_dcd_change
1287 (port->ip_port, 0);
1288 wake_up_interruptible
1289 (&the_port->info->
1290 delta_msr_wait);
1293 /* If we had any data to return, we
1294 * would have returned it above.
1295 */
1296 return 0;
1299 if (*sc & RXSB_MODEM_VALID) {
1300 /* Notify that an input overrun occurred */
1301 if ((*sc & RXSB_OVERRUN)
1302 && (port->ip_notify & N_OVERRUN_ERROR)) {
1303 ioc3_cb_post_ncs(the_port, NCS_OVERRUN);
1305 /* Don't look at this byte again */
1306 *sc &= ~RXSB_MODEM_VALID;
1309 /* Check for valid data or RX errors */
1310 if ((*sc & RXSB_DATA_VALID) &&
1311 ((*sc & (RXSB_PAR_ERR
1312 | RXSB_FRAME_ERR | RXSB_BREAK))
1313 && (port->ip_notify & (N_PARITY_ERROR
1314 | N_FRAMING_ERROR
1315 | N_BREAK)))) {
1316 /* There is an error condition on the next byte.
1317 * If we have already transferred some bytes,
1318 * we'll stop here. Otherwise if this is the
1319 * first byte to be read, we'll just transfer
1320 * it alone after notifying the
1321 * upper layer of its status.
1322 */
1323 if (total > 0) {
1324 len = 0;
1325 break;
1326 } else {
1327 if ((*sc & RXSB_PAR_ERR) &&
1328 (port->
1329 ip_notify & N_PARITY_ERROR)) {
1330 ioc3_cb_post_ncs(the_port,
1331 NCS_PARITY);
1333 if ((*sc & RXSB_FRAME_ERR) &&
1334 (port->
1335 ip_notify & N_FRAMING_ERROR)) {
1336 ioc3_cb_post_ncs(the_port,
1337 NCS_FRAMING);
1339 if ((*sc & RXSB_BREAK)
1340 && (port->ip_notify & N_BREAK)) {
1341 ioc3_cb_post_ncs
1342 (the_port, NCS_BREAK);
1344 len = 1;
1347 if (*sc & RXSB_DATA_VALID) {
1348 *sc &= ~RXSB_DATA_VALID;
1349 *buf = entry->ring_data[byte_num];
1350 buf++;
1351 len--;
1352 total++;
1356 /* If we used up this entry entirely, go on to the next one,
1357 * otherwise we must have run out of buffer space, so
1358 * leave the consumer pointer here for the next read in case
1359 * there are still unread bytes in this entry.
1360 */
1361 if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
1362 cons_ptr += (int)sizeof(struct ring_entry);
1363 cons_ptr &= PROD_CONS_MASK;
1367 /* Update consumer pointer and re-arm rx timer interrupt */
1368 writel(cons_ptr, &port->ip_serial_regs->srcir);
1369 port->ip_rx_cons = cons_ptr;
1371 /* If we have now dipped below the rx high water mark and we have
1372 * rx_high interrupt turned off, we can now turn it back on again.
1373 */
1374 if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr)
1375 & PROD_CONS_MASK) <
1376 ((port->
1377 ip_sscr &
1378 SSCR_RX_THRESHOLD)
1379 << PROD_CONS_PTR_OFF))) {
1380 port->ip_flags &= ~INPUT_HIGH;
1381 enable_intrs(port, hooks->intr_rx_high);
1383 return total;
1386 /**
1387 * receive_chars - upper level read.
1388 * @the_port: port to read from
1389 */
1390 static int receive_chars(struct uart_port *the_port)
1392 struct tty_struct *tty;
1393 unsigned char ch[MAX_CHARS];
1394 int read_count = 0, read_room, flip = 0;
1395 struct uart_info *info = the_port->info;
1396 struct ioc3_port *port = get_ioc3_port(the_port);
1397 unsigned long pflags;
1399 /* Make sure all the pointers are "good" ones */
1400 if (!info)
1401 return 0;
1402 if (!info->tty)
1403 return 0;
1405 if (!(port->ip_flags & INPUT_ENABLE))
1406 return 0;
1408 spin_lock_irqsave(&the_port->lock, pflags);
1409 tty = info->tty;
1411 read_count = do_read(the_port, ch, MAX_CHARS);
1412 if (read_count > 0) {
1413 flip = 1;
1414 read_room = tty_buffer_request_room(tty, read_count);
1415 tty_insert_flip_string(tty, ch, read_room);
1416 the_port->icount.rx += read_count;
1418 spin_unlock_irqrestore(&the_port->lock, pflags);
1420 if (flip)
1421 tty_flip_buffer_push(tty);
1423 return read_count;
1426 /**
1427 * ioc3uart_intr_one - lowest level (per port) interrupt handler.
1428 * @is : submodule
1429 * @idd: driver data
1430 * @pending: interrupts to handle
1431 * @regs: pt_regs
1432 */
1434 static int inline
1435 ioc3uart_intr_one(struct ioc3_submodule *is,
1436 struct ioc3_driver_data *idd,
1437 unsigned int pending, struct pt_regs *regs)
1439 int port_num = GET_PORT_FROM_SIO_IR(pending);
1440 struct port_hooks *hooks;
1441 unsigned int rx_high_rd_aborted = 0;
1442 unsigned long flags;
1443 struct uart_port *the_port;
1444 struct ioc3_port *port;
1445 int loop_counter;
1446 struct ioc3_card *card_ptr;
1447 unsigned int sio_ir;
1449 card_ptr = idd->data[is->id];
1450 port = card_ptr->ic_port[port_num].icp_port;
1451 hooks = port->ip_hooks;
1453 /* Possible race condition here: The tx_mt interrupt bit may be
1454 * cleared without the intervention of the interrupt handler,
1455 * e.g. by a write. If the top level interrupt handler reads a
1456 * tx_mt, then some other processor does a write, starting up
1457 * output, then we come in here, see the tx_mt and stop DMA, the
1458 * output started by the other processor will hang. Thus we can
1459 * only rely on tx_mt being legitimate if it is read while the
1460 * port lock is held. Therefore this bit must be ignored in the
1461 * passed in interrupt mask which was read by the top level
1462 * interrupt handler since the port lock was not held at the time
1463 * it was read. We can only rely on this bit being accurate if it
1464 * is read while the port lock is held. So we'll clear it for now,
1465 * and reload it later once we have the port lock.
1466 */
1468 sio_ir = pending & ~(hooks->intr_tx_mt);
1469 spin_lock_irqsave(&port->ip_lock, flags);
1471 loop_counter = MAXITER; /* to avoid hangs */
1473 do {
1474 uint32_t shadow;
1476 if (loop_counter-- <= 0) {
1477 printk(KERN_WARNING "IOC3 serial: "
1478 "possible hang condition/"
1479 "port stuck on interrupt (line %d).\n",
1480 ((struct uart_port *)port->ip_port)->line);
1481 break;
1483 /* Handle a DCD change */
1484 if (sio_ir & hooks->intr_delta_dcd) {
1485 ioc3_ack(is, idd, hooks->intr_delta_dcd);
1486 shadow = readl(&port->ip_serial_regs->shadow);
1488 if ((port->ip_notify & N_DDCD)
1489 && (shadow & SHADOW_DCD)
1490 && (port->ip_port)) {
1491 the_port = port->ip_port;
1492 uart_handle_dcd_change(the_port,
1493 shadow & SHADOW_DCD);
1494 wake_up_interruptible
1495 (&the_port->info->delta_msr_wait);
1496 } else if ((port->ip_notify & N_DDCD)
1497 && !(shadow & SHADOW_DCD)) {
1498 /* Flag delta DCD/no DCD */
1499 uart_handle_dcd_change(port->ip_port,
1500 shadow & SHADOW_DCD);
1501 port->ip_flags |= DCD_ON;
1505 /* Handle a CTS change */
1506 if (sio_ir & hooks->intr_delta_cts) {
1507 ioc3_ack(is, idd, hooks->intr_delta_cts);
1508 shadow = readl(&port->ip_serial_regs->shadow);
1510 if ((port->ip_notify & N_DCTS) && (port->ip_port)) {
1511 the_port = port->ip_port;
1512 uart_handle_cts_change(the_port, shadow
1513 & SHADOW_CTS);
1514 wake_up_interruptible
1515 (&the_port->info->delta_msr_wait);
1519 /* rx timeout interrupt. Must be some data available. Put this
1520 * before the check for rx_high since servicing this condition
1521 * may cause that condition to clear.
1522 */
1523 if (sio_ir & hooks->intr_rx_timer) {
1524 ioc3_ack(is, idd, hooks->intr_rx_timer);
1525 if ((port->ip_notify & N_DATA_READY)
1526 && (port->ip_port)) {
1527 receive_chars(port->ip_port);
1531 /* rx high interrupt. Must be after rx_timer. */
1532 else if (sio_ir & hooks->intr_rx_high) {
1533 /* Data available, notify upper layer */
1534 if ((port->ip_notify & N_DATA_READY) && port->ip_port) {
1535 receive_chars(port->ip_port);
1538 /* We can't ACK this interrupt. If receive_chars didn't
1539 * cause the condition to clear, we'll have to disable
1540 * the interrupt until the data is drained.
1541 * If the read was aborted, don't disable the interrupt
1542 * as this may cause us to hang indefinitely. An
1543 * aborted read generally means that this interrupt
1544 * hasn't been delivered to the cpu yet anyway, even
1545 * though we see it as asserted when we read the sio_ir.
1546 */
1547 if ((sio_ir = PENDING(card_ptr, idd))
1548 & hooks->intr_rx_high) {
1549 if (port->ip_flags & READ_ABORTED) {
1550 rx_high_rd_aborted++;
1552 else {
1553 card_ptr->ic_enable &= ~hooks->intr_rx_high;
1554 port->ip_flags |= INPUT_HIGH;
1559 /* We got a low water interrupt: notify upper layer to
1560 * send more data. Must come before tx_mt since servicing
1561 * this condition may cause that condition to clear.
1562 */
1563 if (sio_ir & hooks->intr_tx_explicit) {
1564 port->ip_flags &= ~LOWAT_WRITTEN;
1565 ioc3_ack(is, idd, hooks->intr_tx_explicit);
1566 if (port->ip_notify & N_OUTPUT_LOWAT)
1567 ioc3_cb_output_lowat(port);
1570 /* Handle tx_mt. Must come after tx_explicit. */
1571 else if (sio_ir & hooks->intr_tx_mt) {
1572 /* If we are expecting a lowat notification
1573 * and we get to this point it probably means that for
1574 * some reason the tx_explicit didn't work as expected
1575 * (that can legitimately happen if the output buffer is
1576 * filled up in just the right way).
1577 * So send the notification now.
1578 */
1579 if (port->ip_notify & N_OUTPUT_LOWAT) {
1580 ioc3_cb_output_lowat(port);
1582 /* We need to reload the sio_ir since the lowat
1583 * call may have caused another write to occur,
1584 * clearing the tx_mt condition.
1585 */
1586 sio_ir = PENDING(card_ptr, idd);
1589 /* If the tx_mt condition still persists even after the
1590 * lowat call, we've got some work to do.
1591 */
1592 if (sio_ir & hooks->intr_tx_mt) {
1593 /* If we are not currently expecting DMA input,
1594 * and the transmitter has just gone idle,
1595 * there is no longer any reason for DMA, so
1596 * disable it.
1597 */
1598 if (!(port->ip_notify
1599 & (N_DATA_READY | N_DDCD))) {
1600 BUG_ON(!(port->ip_sscr
1601 & SSCR_DMA_EN));
1602 port->ip_sscr &= ~SSCR_DMA_EN;
1603 writel(port->ip_sscr,
1604 &port->ip_serial_regs->sscr);
1606 /* Prevent infinite tx_mt interrupt */
1607 card_ptr->ic_enable &= ~hooks->intr_tx_mt;
1610 sio_ir = PENDING(card_ptr, idd);
1612 /* if the read was aborted and only hooks->intr_rx_high,
1613 * clear hooks->intr_rx_high, so we do not loop forever.
1614 */
1616 if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) {
1617 sio_ir &= ~hooks->intr_rx_high;
1619 } while (sio_ir & hooks->intr_all);
1621 spin_unlock_irqrestore(&port->ip_lock, flags);
1622 ioc3_enable(is, idd, card_ptr->ic_enable);
1623 return 0;
1626 /**
1627 * ioc3uart_intr - field all serial interrupts
1628 * @is : submodule
1629 * @idd: driver data
1630 * @pending: interrupts to handle
1631 * @regs: pt_regs
1633 */
1635 static int ioc3uart_intr(struct ioc3_submodule *is,
1636 struct ioc3_driver_data *idd,
1637 unsigned int pending, struct pt_regs *regs)
1639 int ret = 0;
1641 /*
1642 * The upper level interrupt handler sends interrupts for both ports
1643 * here. So we need to call for each port with its interrupts.
1644 */
1646 if (pending & SIO_IR_SA)
1647 ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SA, regs);
1648 if (pending & SIO_IR_SB)
1649 ret |= ioc3uart_intr_one(is, idd, pending & SIO_IR_SB, regs);
1651 return ret;
1654 /**
1655 * ic3_type
1656 * @port: Port to operate with (we ignore since we only have one port)
1658 */
1659 static const char *ic3_type(struct uart_port *the_port)
1661 if (IS_RS232(the_port->line))
1662 return "SGI IOC3 Serial [rs232]";
1663 else
1664 return "SGI IOC3 Serial [rs422]";
1667 /**
1668 * ic3_tx_empty - Is the transmitter empty?
1669 * @port: Port to operate on
1671 */
1672 static unsigned int ic3_tx_empty(struct uart_port *the_port)
1674 unsigned int ret = 0;
1675 struct ioc3_port *port = get_ioc3_port(the_port);
1677 if (readl(&port->ip_serial_regs->shadow) & SHADOW_TEMT)
1678 ret = TIOCSER_TEMT;
1679 return ret;
1682 /**
1683 * ic3_stop_tx - stop the transmitter
1684 * @port: Port to operate on
1686 */
1687 static void ic3_stop_tx(struct uart_port *the_port)
1689 struct ioc3_port *port = get_ioc3_port(the_port);
1691 if (port)
1692 set_notification(port, N_OUTPUT_LOWAT, 0);
1695 /**
1696 * ic3_stop_rx - stop the receiver
1697 * @port: Port to operate on
1699 */
1700 static void ic3_stop_rx(struct uart_port *the_port)
1702 struct ioc3_port *port = get_ioc3_port(the_port);
1704 if (port)
1705 port->ip_flags &= ~INPUT_ENABLE;
1708 /**
1709 * null_void_function
1710 * @port: Port to operate on
1712 */
1713 static void null_void_function(struct uart_port *the_port)
1717 /**
1718 * ic3_shutdown - shut down the port - free irq and disable
1719 * @port: port to shut down
1721 */
1722 static void ic3_shutdown(struct uart_port *the_port)
1724 unsigned long port_flags;
1725 struct ioc3_port *port;
1726 struct uart_info *info;
1728 port = get_ioc3_port(the_port);
1729 if (!port)
1730 return;
1732 info = the_port->info;
1733 wake_up_interruptible(&info->delta_msr_wait);
1735 spin_lock_irqsave(&the_port->lock, port_flags);
1736 set_notification(port, N_ALL, 0);
1737 spin_unlock_irqrestore(&the_port->lock, port_flags);
1740 /**
1741 * ic3_set_mctrl - set control lines (dtr, rts, etc)
1742 * @port: Port to operate on
1743 * @mctrl: Lines to set/unset
1745 */
1746 static void ic3_set_mctrl(struct uart_port *the_port, unsigned int mctrl)
1748 unsigned char mcr = 0;
1750 if (mctrl & TIOCM_RTS)
1751 mcr |= UART_MCR_RTS;
1752 if (mctrl & TIOCM_DTR)
1753 mcr |= UART_MCR_DTR;
1754 if (mctrl & TIOCM_OUT1)
1755 mcr |= UART_MCR_OUT1;
1756 if (mctrl & TIOCM_OUT2)
1757 mcr |= UART_MCR_OUT2;
1758 if (mctrl & TIOCM_LOOP)
1759 mcr |= UART_MCR_LOOP;
1761 set_mcr(the_port, mcr, SHADOW_DTR);
1764 /**
1765 * ic3_get_mctrl - get control line info
1766 * @port: port to operate on
1768 */
1769 static unsigned int ic3_get_mctrl(struct uart_port *the_port)
1771 struct ioc3_port *port = get_ioc3_port(the_port);
1772 uint32_t shadow;
1773 unsigned int ret = 0;
1775 if (!port)
1776 return 0;
1778 shadow = readl(&port->ip_serial_regs->shadow);
1779 if (shadow & SHADOW_DCD)
1780 ret |= TIOCM_CD;
1781 if (shadow & SHADOW_DR)
1782 ret |= TIOCM_DSR;
1783 if (shadow & SHADOW_CTS)
1784 ret |= TIOCM_CTS;
1785 return ret;
1788 /**
1789 * ic3_start_tx - Start transmitter. Called with the_port->lock
1790 * @port: Port to operate on
1792 */
1793 static void ic3_start_tx(struct uart_port *the_port)
1795 struct ioc3_port *port = get_ioc3_port(the_port);
1797 if (port) {
1798 set_notification(port, N_OUTPUT_LOWAT, 1);
1799 enable_intrs(port, port->ip_hooks->intr_tx_mt);
1803 /**
1804 * ic3_break_ctl - handle breaks
1805 * @port: Port to operate on
1806 * @break_state: Break state
1808 */
1809 static void ic3_break_ctl(struct uart_port *the_port, int break_state)
1813 /**
1814 * ic3_startup - Start up the serial port - always return 0 (We're always on)
1815 * @port: Port to operate on
1817 */
1818 static int ic3_startup(struct uart_port *the_port)
1820 int retval;
1821 struct ioc3_port *port;
1822 struct ioc3_card *card_ptr;
1823 unsigned long port_flags;
1825 if (!the_port) {
1826 NOT_PROGRESS();
1827 return -ENODEV;
1829 port = get_ioc3_port(the_port);
1830 if (!port) {
1831 NOT_PROGRESS();
1832 return -ENODEV;
1834 card_ptr = port->ip_card;
1835 port->ip_port = the_port;
1837 if (!card_ptr) {
1838 NOT_PROGRESS();
1839 return -ENODEV;
1842 /* Start up the serial port */
1843 spin_lock_irqsave(&the_port->lock, port_flags);
1844 retval = ic3_startup_local(the_port);
1845 spin_unlock_irqrestore(&the_port->lock, port_flags);
1846 return retval;
1849 /**
1850 * ic3_set_termios - set termios stuff
1851 * @port: port to operate on
1852 * @termios: New settings
1853 * @termios: Old
1855 */
1856 static void
1857 ic3_set_termios(struct uart_port *the_port,
1858 struct termios *termios, struct termios *old_termios)
1860 unsigned long port_flags;
1862 spin_lock_irqsave(&the_port->lock, port_flags);
1863 ioc3_change_speed(the_port, termios, old_termios);
1864 spin_unlock_irqrestore(&the_port->lock, port_flags);
1867 /**
1868 * ic3_request_port - allocate resources for port - no op....
1869 * @port: port to operate on
1871 */
1872 static int ic3_request_port(struct uart_port *port)
1874 return 0;
1877 /* Associate the uart functions above - given to serial core */
1878 static struct uart_ops ioc3_ops = {
1879 .tx_empty = ic3_tx_empty,
1880 .set_mctrl = ic3_set_mctrl,
1881 .get_mctrl = ic3_get_mctrl,
1882 .stop_tx = ic3_stop_tx,
1883 .start_tx = ic3_start_tx,
1884 .stop_rx = ic3_stop_rx,
1885 .enable_ms = null_void_function,
1886 .break_ctl = ic3_break_ctl,
1887 .startup = ic3_startup,
1888 .shutdown = ic3_shutdown,
1889 .set_termios = ic3_set_termios,
1890 .type = ic3_type,
1891 .release_port = null_void_function,
1892 .request_port = ic3_request_port,
1893 };
1895 /*
1896 * Boot-time initialization code
1897 */
1899 static struct uart_driver ioc3_uart = {
1900 .owner = THIS_MODULE,
1901 .driver_name = "ioc3_serial",
1902 .dev_name = DEVICE_NAME,
1903 .major = DEVICE_MAJOR,
1904 .minor = DEVICE_MINOR,
1905 .nr = MAX_LOGICAL_PORTS
1906 };
1908 /**
1909 * ioc3_serial_core_attach - register with serial core
1910 * This is done during pci probing
1911 * @is: submodule struct for this
1912 * @idd: handle for this card
1913 */
1914 static inline int ioc3_serial_core_attach( struct ioc3_submodule *is,
1915 struct ioc3_driver_data *idd)
1917 struct ioc3_port *port;
1918 struct uart_port *the_port;
1919 struct ioc3_card *card_ptr = idd->data[is->id];
1920 int ii, phys_port;
1921 struct pci_dev *pdev = idd->pdev;
1923 DPRINT_CONFIG(("%s: attach pdev 0x%p - card_ptr 0x%p\n",
1924 __FUNCTION__, pdev, (void *)card_ptr));
1926 if (!card_ptr)
1927 return -ENODEV;
1929 /* once around for each logical port on this card */
1930 for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) {
1931 phys_port = GET_PHYSICAL_PORT(ii);
1932 the_port = &card_ptr->ic_port[phys_port].
1933 icp_uart_port[GET_LOGICAL_PORT(ii)];
1934 port = card_ptr->ic_port[phys_port].icp_port;
1935 port->ip_port = the_port;
1937 DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p [%d/%d]\n",
1938 __FUNCTION__, (void *)the_port, (void *)port,
1939 phys_port, ii));
1941 /* membase, iobase and mapbase just need to be non-0 */
1942 the_port->membase = (unsigned char __iomem *)1;
1943 the_port->iobase = (pdev->bus->number << 16) | ii;
1944 the_port->line = (Num_of_ioc3_cards << 2) | ii;
1945 the_port->mapbase = 1;
1946 the_port->type = PORT_16550A;
1947 the_port->fifosize = FIFO_SIZE;
1948 the_port->ops = &ioc3_ops;
1949 the_port->irq = idd->irq_io;
1950 the_port->dev = &pdev->dev;
1952 if (uart_add_one_port(&ioc3_uart, the_port) < 0) {
1953 printk(KERN_WARNING
1954 "%s: unable to add port %d bus %d\n",
1955 __FUNCTION__, the_port->line, pdev->bus->number);
1956 } else {
1957 DPRINT_CONFIG(("IOC3 serial port %d irq %d bus %d\n",
1958 the_port->line, the_port->irq, pdev->bus->number));
1961 /* all ports are rs232 for now */
1962 if (IS_PHYSICAL_PORT(ii))
1963 ioc3_set_proto(port, PROTO_RS232);
1965 return 0;
1968 /**
1969 * ioc3uart_remove - register detach function
1970 * @is: submodule struct for this submodule
1971 * @idd: ioc3 driver data for this submodule
1972 */
1974 static int ioc3uart_remove(struct ioc3_submodule *is,
1975 struct ioc3_driver_data *idd)
1977 struct ioc3_card *card_ptr = idd->data[is->id];
1978 struct uart_port *the_port;
1979 struct ioc3_port *port;
1980 int ii;
1982 if (card_ptr) {
1983 for (ii = 0; ii < LOGICAL_PORTS_PER_CARD; ii++) {
1984 the_port = &card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].
1985 icp_uart_port[GET_LOGICAL_PORT(ii)];
1986 if (the_port)
1987 uart_remove_one_port(&ioc3_uart, the_port);
1988 port = card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].icp_port;
1989 if (port && IS_PHYSICAL_PORT(ii)
1990 && (GET_PHYSICAL_PORT(ii) == 0)) {
1991 pci_free_consistent(port->ip_idd->pdev,
1992 TOTAL_RING_BUF_SIZE,
1993 (void *)port->ip_cpu_ringbuf,
1994 port->ip_dma_ringbuf);
1995 kfree(port);
1996 card_ptr->ic_port[GET_PHYSICAL_PORT(ii)].
1997 icp_port = NULL;
2000 kfree(card_ptr);
2001 idd->data[is->id] = NULL;
2003 return 0;
2006 /**
2007 * ioc3uart_probe - card probe function called from shim driver
2008 * @is: submodule struct for this submodule
2009 * @idd: ioc3 driver data for this card
2010 */
2012 static int __devinit
2013 ioc3uart_probe(struct ioc3_submodule *is, struct ioc3_driver_data *idd)
2015 struct pci_dev *pdev = idd->pdev;
2016 struct ioc3_card *card_ptr;
2017 int ret = 0;
2018 struct ioc3_port *port;
2019 struct ioc3_port *ports[PORTS_PER_CARD];
2020 int phys_port;
2022 DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __FUNCTION__, is, idd));
2024 card_ptr = kmalloc(sizeof(struct ioc3_card), GFP_KERNEL);
2025 if (!card_ptr) {
2026 printk(KERN_WARNING "ioc3_attach_one"
2027 ": unable to get memory for the IOC3\n");
2028 return -ENOMEM;
2030 memset(card_ptr, 0, sizeof(struct ioc3_card));
2031 idd->data[is->id] = card_ptr;
2032 Submodule_slot = is->id;
2034 writel(((UARTA_BASE >> 3) << SIO_CR_SER_A_BASE_SHIFT) |
2035 ((UARTB_BASE >> 3) << SIO_CR_SER_B_BASE_SHIFT) |
2036 (0xf << SIO_CR_CMD_PULSE_SHIFT), &idd->vma->sio_cr);
2038 pci_write_config_dword(pdev, PCI_LAT, 0xff00);
2040 /* Enable serial port mode select generic PIO pins as outputs */
2041 ioc3_gpcr_set(idd, GPCR_UARTA_MODESEL | GPCR_UARTB_MODESEL);
2043 /* Create port structures for each port */
2044 for (phys_port = 0; phys_port < PORTS_PER_CARD; phys_port++) {
2045 port = kmalloc(sizeof(struct ioc3_port), GFP_KERNEL);
2046 if (!port) {
2047 printk(KERN_WARNING
2048 "IOC3 serial memory not available for port\n");
2049 goto out4;
2051 memset(port, 0, sizeof(struct ioc3_port));
2052 spin_lock_init(&port->ip_lock);
2054 /* we need to remember the previous ones, to point back to
2055 * them farther down - setting up the ring buffers.
2056 */
2057 ports[phys_port] = port;
2059 /* init to something useful */
2060 card_ptr->ic_port[phys_port].icp_port = port;
2061 port->ip_is = is;
2062 port->ip_idd = idd;
2063 port->ip_baud = 9600;
2064 port->ip_card = card_ptr;
2065 port->ip_hooks = &hooks_array[phys_port];
2067 /* Setup each port */
2068 if (phys_port == 0) {
2069 port->ip_serial_regs = &idd->vma->port_a;
2070 port->ip_uart_regs = &idd->vma->sregs.uarta;
2072 DPRINT_CONFIG(("%s : Port A ip_serial_regs 0x%p "
2073 "ip_uart_regs 0x%p\n",
2074 __FUNCTION__,
2075 (void *)port->ip_serial_regs,
2076 (void *)port->ip_uart_regs));
2078 /* setup ring buffers */
2079 port->ip_cpu_ringbuf = pci_alloc_consistent(pdev,
2080 TOTAL_RING_BUF_SIZE, &port->ip_dma_ringbuf);
2082 BUG_ON(!((((int64_t) port->ip_dma_ringbuf) &
2083 (TOTAL_RING_BUF_SIZE - 1)) == 0));
2084 port->ip_inring = RING(port, RX_A);
2085 port->ip_outring = RING(port, TX_A);
2086 DPRINT_CONFIG(("%s : Port A ip_cpu_ringbuf 0x%p "
2087 "ip_dma_ringbuf 0x%p, ip_inring 0x%p "
2088 "ip_outring 0x%p\n",
2089 __FUNCTION__,
2090 (void *)port->ip_cpu_ringbuf,
2091 (void *)port->ip_dma_ringbuf,
2092 (void *)port->ip_inring,
2093 (void *)port->ip_outring));
2095 else {
2096 port->ip_serial_regs = &idd->vma->port_b;
2097 port->ip_uart_regs = &idd->vma->sregs.uartb;
2099 DPRINT_CONFIG(("%s : Port B ip_serial_regs 0x%p "
2100 "ip_uart_regs 0x%p\n",
2101 __FUNCTION__,
2102 (void *)port->ip_serial_regs,
2103 (void *)port->ip_uart_regs));
2105 /* share the ring buffers */
2106 port->ip_dma_ringbuf =
2107 ports[phys_port - 1]->ip_dma_ringbuf;
2108 port->ip_cpu_ringbuf =
2109 ports[phys_port - 1]->ip_cpu_ringbuf;
2110 port->ip_inring = RING(port, RX_B);
2111 port->ip_outring = RING(port, TX_B);
2112 DPRINT_CONFIG(("%s : Port B ip_cpu_ringbuf 0x%p "
2113 "ip_dma_ringbuf 0x%p, ip_inring 0x%p "
2114 "ip_outring 0x%p\n",
2115 __FUNCTION__,
2116 (void *)port->ip_cpu_ringbuf,
2117 (void *)port->ip_dma_ringbuf,
2118 (void *)port->ip_inring,
2119 (void *)port->ip_outring));
2122 DPRINT_CONFIG(("%s : port %d [addr 0x%p] card_ptr 0x%p",
2123 __FUNCTION__,
2124 phys_port, (void *)port, (void *)card_ptr));
2125 DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n",
2126 (void *)port->ip_serial_regs,
2127 (void *)port->ip_uart_regs));
2129 /* Initialize the hardware for IOC3 */
2130 port_init(port);
2132 DPRINT_CONFIG(("%s: phys_port %d port 0x%p inring 0x%p "
2133 "outring 0x%p\n",
2134 __FUNCTION__,
2135 phys_port, (void *)port,
2136 (void *)port->ip_inring,
2137 (void *)port->ip_outring));
2141 /* register port with the serial core */
2143 if ((ret = ioc3_serial_core_attach(is, idd)))
2144 goto out4;
2146 Num_of_ioc3_cards++;
2148 return ret;
2150 /* error exits that give back resources */
2151 out4:
2152 kfree(card_ptr);
2153 return ret;
2156 static struct ioc3_submodule ioc3uart_submodule = {
2157 .name = "IOC3uart",
2158 .probe = ioc3uart_probe,
2159 .remove = ioc3uart_remove,
2160 /* call .intr for both ports initially */
2161 .irq_mask = SIO_IR_SA | SIO_IR_SB,
2162 .intr = ioc3uart_intr,
2163 .owner = THIS_MODULE,
2164 };
2166 /**
2167 * ioc3_detect - module init called,
2168 */
2169 static int __devinit ioc3uart_init(void)
2171 int ret;
2173 /* register with serial core */
2174 if ((ret = uart_register_driver(&ioc3_uart)) < 0) {
2175 printk(KERN_WARNING
2176 "%s: Couldn't register IOC3 uart serial driver\n",
2177 __FUNCTION__);
2178 return ret;
2180 ret = ioc3_register_submodule(&ioc3uart_submodule);
2181 if (ret)
2182 uart_unregister_driver(&ioc3_uart);
2183 return ret;
2186 static void __devexit ioc3uart_exit(void)
2188 ioc3_unregister_submodule(&ioc3uart_submodule);
2189 uart_unregister_driver(&ioc3_uart);
2192 module_init(ioc3uart_init);
2193 module_exit(ioc3uart_exit);
2195 MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>");
2196 MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC3 card");
2197 MODULE_LICENSE("GPL");