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
6 * Copyright (C) 2003-2006 Silicon Graphics, Inc. All Rights Reserved.
11 * This file contains a module version of the ioc4 serial driver. This
12 * includes all the support functions needed (support functions, etc.)
13 * and the serial driver itself.
15 #include <linux/errno.h>
16 #include <linux/tty.h>
17 #include <linux/tty_flip.h>
18 #include <linux/serial.h>
19 #include <linux/circ_buf.h>
20 #include <linux/serial_reg.h>
21 #include <linux/module.h>
22 #include <linux/pci.h>
23 #include <linux/ioc4.h>
24 #include <linux/serial_core.h>
25 #include <linux/slab.h>
28 * interesting things about the ioc4
31 #define IOC4_NUM_SERIAL_PORTS 4 /* max ports per card */
32 #define IOC4_NUM_CARDS 8 /* max cards per partition */
34 #define GET_SIO_IR(_n) (_n == 0) ? (IOC4_SIO_IR_S0) : \
35 (_n == 1) ? (IOC4_SIO_IR_S1) : \
36 (_n == 2) ? (IOC4_SIO_IR_S2) : \
39 #define GET_OTHER_IR(_n) (_n == 0) ? (IOC4_OTHER_IR_S0_MEMERR) : \
40 (_n == 1) ? (IOC4_OTHER_IR_S1_MEMERR) : \
41 (_n == 2) ? (IOC4_OTHER_IR_S2_MEMERR) : \
42 (IOC4_OTHER_IR_S3_MEMERR)
46 * All IOC4 registers are 32 bits wide.
50 * PCI Memory Space Map
52 #define IOC4_PCI_ERR_ADDR_L 0x000 /* Low Error Address */
53 #define IOC4_PCI_ERR_ADDR_VLD (0x1 << 0)
54 #define IOC4_PCI_ERR_ADDR_MST_ID_MSK (0xf << 1)
55 #define IOC4_PCI_ERR_ADDR_MST_NUM_MSK (0xe << 1)
56 #define IOC4_PCI_ERR_ADDR_MST_TYP_MSK (0x1 << 1)
57 #define IOC4_PCI_ERR_ADDR_MUL_ERR (0x1 << 5)
58 #define IOC4_PCI_ERR_ADDR_ADDR_MSK (0x3ffffff << 6)
61 #define IOC4_SIO_INTR_TYPE 0
62 #define IOC4_OTHER_INTR_TYPE 1
63 #define IOC4_NUM_INTR_TYPES 2
65 /* Bitmasks for IOC4_SIO_IR, IOC4_SIO_IEC, and IOC4_SIO_IES */
66 #define IOC4_SIO_IR_S0_TX_MT 0x00000001 /* Serial port 0 TX empty */
67 #define IOC4_SIO_IR_S0_RX_FULL 0x00000002 /* Port 0 RX buf full */
68 #define IOC4_SIO_IR_S0_RX_HIGH 0x00000004 /* Port 0 RX hiwat */
69 #define IOC4_SIO_IR_S0_RX_TIMER 0x00000008 /* Port 0 RX timeout */
70 #define IOC4_SIO_IR_S0_DELTA_DCD 0x00000010 /* Port 0 delta DCD */
71 #define IOC4_SIO_IR_S0_DELTA_CTS 0x00000020 /* Port 0 delta CTS */
72 #define IOC4_SIO_IR_S0_INT 0x00000040 /* Port 0 pass-thru intr */
73 #define IOC4_SIO_IR_S0_TX_EXPLICIT 0x00000080 /* Port 0 explicit TX thru */
74 #define IOC4_SIO_IR_S1_TX_MT 0x00000100 /* Serial port 1 */
75 #define IOC4_SIO_IR_S1_RX_FULL 0x00000200 /* */
76 #define IOC4_SIO_IR_S1_RX_HIGH 0x00000400 /* */
77 #define IOC4_SIO_IR_S1_RX_TIMER 0x00000800 /* */
78 #define IOC4_SIO_IR_S1_DELTA_DCD 0x00001000 /* */
79 #define IOC4_SIO_IR_S1_DELTA_CTS 0x00002000 /* */
80 #define IOC4_SIO_IR_S1_INT 0x00004000 /* */
81 #define IOC4_SIO_IR_S1_TX_EXPLICIT 0x00008000 /* */
82 #define IOC4_SIO_IR_S2_TX_MT 0x00010000 /* Serial port 2 */
83 #define IOC4_SIO_IR_S2_RX_FULL 0x00020000 /* */
84 #define IOC4_SIO_IR_S2_RX_HIGH 0x00040000 /* */
85 #define IOC4_SIO_IR_S2_RX_TIMER 0x00080000 /* */
86 #define IOC4_SIO_IR_S2_DELTA_DCD 0x00100000 /* */
87 #define IOC4_SIO_IR_S2_DELTA_CTS 0x00200000 /* */
88 #define IOC4_SIO_IR_S2_INT 0x00400000 /* */
89 #define IOC4_SIO_IR_S2_TX_EXPLICIT 0x00800000 /* */
90 #define IOC4_SIO_IR_S3_TX_MT 0x01000000 /* Serial port 3 */
91 #define IOC4_SIO_IR_S3_RX_FULL 0x02000000 /* */
92 #define IOC4_SIO_IR_S3_RX_HIGH 0x04000000 /* */
93 #define IOC4_SIO_IR_S3_RX_TIMER 0x08000000 /* */
94 #define IOC4_SIO_IR_S3_DELTA_DCD 0x10000000 /* */
95 #define IOC4_SIO_IR_S3_DELTA_CTS 0x20000000 /* */
96 #define IOC4_SIO_IR_S3_INT 0x40000000 /* */
97 #define IOC4_SIO_IR_S3_TX_EXPLICIT 0x80000000 /* */
99 /* Per device interrupt masks */
100 #define IOC4_SIO_IR_S0 (IOC4_SIO_IR_S0_TX_MT | \
101 IOC4_SIO_IR_S0_RX_FULL | \
102 IOC4_SIO_IR_S0_RX_HIGH | \
103 IOC4_SIO_IR_S0_RX_TIMER | \
104 IOC4_SIO_IR_S0_DELTA_DCD | \
105 IOC4_SIO_IR_S0_DELTA_CTS | \
106 IOC4_SIO_IR_S0_INT | \
107 IOC4_SIO_IR_S0_TX_EXPLICIT)
108 #define IOC4_SIO_IR_S1 (IOC4_SIO_IR_S1_TX_MT | \
109 IOC4_SIO_IR_S1_RX_FULL | \
110 IOC4_SIO_IR_S1_RX_HIGH | \
111 IOC4_SIO_IR_S1_RX_TIMER | \
112 IOC4_SIO_IR_S1_DELTA_DCD | \
113 IOC4_SIO_IR_S1_DELTA_CTS | \
114 IOC4_SIO_IR_S1_INT | \
115 IOC4_SIO_IR_S1_TX_EXPLICIT)
116 #define IOC4_SIO_IR_S2 (IOC4_SIO_IR_S2_TX_MT | \
117 IOC4_SIO_IR_S2_RX_FULL | \
118 IOC4_SIO_IR_S2_RX_HIGH | \
119 IOC4_SIO_IR_S2_RX_TIMER | \
120 IOC4_SIO_IR_S2_DELTA_DCD | \
121 IOC4_SIO_IR_S2_DELTA_CTS | \
122 IOC4_SIO_IR_S2_INT | \
123 IOC4_SIO_IR_S2_TX_EXPLICIT)
124 #define IOC4_SIO_IR_S3 (IOC4_SIO_IR_S3_TX_MT | \
125 IOC4_SIO_IR_S3_RX_FULL | \
126 IOC4_SIO_IR_S3_RX_HIGH | \
127 IOC4_SIO_IR_S3_RX_TIMER | \
128 IOC4_SIO_IR_S3_DELTA_DCD | \
129 IOC4_SIO_IR_S3_DELTA_CTS | \
130 IOC4_SIO_IR_S3_INT | \
131 IOC4_SIO_IR_S3_TX_EXPLICIT)
133 /* Bitmasks for IOC4_OTHER_IR, IOC4_OTHER_IEC, and IOC4_OTHER_IES */
134 #define IOC4_OTHER_IR_ATA_INT 0x00000001 /* ATAPI intr pass-thru */
135 #define IOC4_OTHER_IR_ATA_MEMERR 0x00000002 /* ATAPI DMA PCI error */
136 #define IOC4_OTHER_IR_S0_MEMERR 0x00000004 /* Port 0 PCI error */
137 #define IOC4_OTHER_IR_S1_MEMERR 0x00000008 /* Port 1 PCI error */
138 #define IOC4_OTHER_IR_S2_MEMERR 0x00000010 /* Port 2 PCI error */
139 #define IOC4_OTHER_IR_S3_MEMERR 0x00000020 /* Port 3 PCI error */
140 #define IOC4_OTHER_IR_KBD_INT 0x00000040 /* Keyboard/mouse */
141 #define IOC4_OTHER_IR_RESERVED 0x007fff80 /* Reserved */
142 #define IOC4_OTHER_IR_RT_INT 0x00800000 /* INT_OUT section output */
143 #define IOC4_OTHER_IR_GEN_INT 0xff000000 /* Generic pins */
145 #define IOC4_OTHER_IR_SER_MEMERR (IOC4_OTHER_IR_S0_MEMERR | IOC4_OTHER_IR_S1_MEMERR | \
146 IOC4_OTHER_IR_S2_MEMERR | IOC4_OTHER_IR_S3_MEMERR)
148 /* Bitmasks for IOC4_SIO_CR */
149 #define IOC4_SIO_CR_CMD_PULSE_SHIFT 0 /* byte bus strobe shift */
150 #define IOC4_SIO_CR_ARB_DIAG_TX0 0x00000000
151 #define IOC4_SIO_CR_ARB_DIAG_RX0 0x00000010
152 #define IOC4_SIO_CR_ARB_DIAG_TX1 0x00000020
153 #define IOC4_SIO_CR_ARB_DIAG_RX1 0x00000030
154 #define IOC4_SIO_CR_ARB_DIAG_TX2 0x00000040
155 #define IOC4_SIO_CR_ARB_DIAG_RX2 0x00000050
156 #define IOC4_SIO_CR_ARB_DIAG_TX3 0x00000060
157 #define IOC4_SIO_CR_ARB_DIAG_RX3 0x00000070
158 #define IOC4_SIO_CR_SIO_DIAG_IDLE 0x00000080 /* 0 -> active request among
160 /* Defs for some of the generic I/O pins */
161 #define IOC4_GPCR_UART0_MODESEL 0x10 /* Pin is output to port 0
163 #define IOC4_GPCR_UART1_MODESEL 0x20 /* Pin is output to port 1
165 #define IOC4_GPCR_UART2_MODESEL 0x40 /* Pin is output to port 2
167 #define IOC4_GPCR_UART3_MODESEL 0x80 /* Pin is output to port 3
170 #define IOC4_GPPR_UART0_MODESEL_PIN 4 /* GIO pin controlling
171 uart 0 mode select */
172 #define IOC4_GPPR_UART1_MODESEL_PIN 5 /* GIO pin controlling
173 uart 1 mode select */
174 #define IOC4_GPPR_UART2_MODESEL_PIN 6 /* GIO pin controlling
175 uart 2 mode select */
176 #define IOC4_GPPR_UART3_MODESEL_PIN 7 /* GIO pin controlling
177 uart 3 mode select */
179 /* Bitmasks for serial RX status byte */
180 #define IOC4_RXSB_OVERRUN 0x01 /* Char(s) lost */
181 #define IOC4_RXSB_PAR_ERR 0x02 /* Parity error */
182 #define IOC4_RXSB_FRAME_ERR 0x04 /* Framing error */
183 #define IOC4_RXSB_BREAK 0x08 /* Break character */
184 #define IOC4_RXSB_CTS 0x10 /* State of CTS */
185 #define IOC4_RXSB_DCD 0x20 /* State of DCD */
186 #define IOC4_RXSB_MODEM_VALID 0x40 /* DCD, CTS, and OVERRUN are valid */
187 #define IOC4_RXSB_DATA_VALID 0x80 /* Data byte, FRAME_ERR PAR_ERR
190 /* Bitmasks for serial TX control byte */
191 #define IOC4_TXCB_INT_WHEN_DONE 0x20 /* Interrupt after this byte is sent */
192 #define IOC4_TXCB_INVALID 0x00 /* Byte is invalid */
193 #define IOC4_TXCB_VALID 0x40 /* Byte is valid */
194 #define IOC4_TXCB_MCR 0x80 /* Data<7:0> to modem control reg */
195 #define IOC4_TXCB_DELAY 0xc0 /* Delay data<7:0> mSec */
197 /* Bitmasks for IOC4_SBBR_L */
198 #define IOC4_SBBR_L_SIZE 0x00000001 /* 0 == 1KB rings, 1 == 4KB rings */
200 /* Bitmasks for IOC4_SSCR_<3:0> */
201 #define IOC4_SSCR_RX_THRESHOLD 0x000001ff /* Hiwater mark */
202 #define IOC4_SSCR_TX_TIMER_BUSY 0x00010000 /* TX timer in progress */
203 #define IOC4_SSCR_HFC_EN 0x00020000 /* Hardware flow control enabled */
204 #define IOC4_SSCR_RX_RING_DCD 0x00040000 /* Post RX record on delta-DCD */
205 #define IOC4_SSCR_RX_RING_CTS 0x00080000 /* Post RX record on delta-CTS */
206 #define IOC4_SSCR_DIAG 0x00200000 /* Bypass clock divider for sim */
207 #define IOC4_SSCR_RX_DRAIN 0x08000000 /* Drain RX buffer to memory */
208 #define IOC4_SSCR_DMA_EN 0x10000000 /* Enable ring buffer DMA */
209 #define IOC4_SSCR_DMA_PAUSE 0x20000000 /* Pause DMA */
210 #define IOC4_SSCR_PAUSE_STATE 0x40000000 /* Sets when PAUSE takes effect */
211 #define IOC4_SSCR_RESET 0x80000000 /* Reset DMA channels */
213 /* All producer/comsumer pointers are the same bitfield */
214 #define IOC4_PROD_CONS_PTR_4K 0x00000ff8 /* For 4K buffers */
215 #define IOC4_PROD_CONS_PTR_1K 0x000003f8 /* For 1K buffers */
216 #define IOC4_PROD_CONS_PTR_OFF 3
218 /* Bitmasks for IOC4_SRCIR_<3:0> */
219 #define IOC4_SRCIR_ARM 0x80000000 /* Arm RX timer */
221 /* Bitmasks for IOC4_SHADOW_<3:0> */
222 #define IOC4_SHADOW_DR 0x00000001 /* Data ready */
223 #define IOC4_SHADOW_OE 0x00000002 /* Overrun error */
224 #define IOC4_SHADOW_PE 0x00000004 /* Parity error */
225 #define IOC4_SHADOW_FE 0x00000008 /* Framing error */
226 #define IOC4_SHADOW_BI 0x00000010 /* Break interrupt */
227 #define IOC4_SHADOW_THRE 0x00000020 /* Xmit holding register empty */
228 #define IOC4_SHADOW_TEMT 0x00000040 /* Xmit shift register empty */
229 #define IOC4_SHADOW_RFCE 0x00000080 /* Char in RX fifo has an error */
230 #define IOC4_SHADOW_DCTS 0x00010000 /* Delta clear to send */
231 #define IOC4_SHADOW_DDCD 0x00080000 /* Delta data carrier detect */
232 #define IOC4_SHADOW_CTS 0x00100000 /* Clear to send */
233 #define IOC4_SHADOW_DCD 0x00800000 /* Data carrier detect */
234 #define IOC4_SHADOW_DTR 0x01000000 /* Data terminal ready */
235 #define IOC4_SHADOW_RTS 0x02000000 /* Request to send */
236 #define IOC4_SHADOW_OUT1 0x04000000 /* 16550 OUT1 bit */
237 #define IOC4_SHADOW_OUT2 0x08000000 /* 16550 OUT2 bit */
238 #define IOC4_SHADOW_LOOP 0x10000000 /* Loopback enabled */
240 /* Bitmasks for IOC4_SRTR_<3:0> */
241 #define IOC4_SRTR_CNT 0x00000fff /* Reload value for RX timer */
242 #define IOC4_SRTR_CNT_VAL 0x0fff0000 /* Current value of RX timer */
243 #define IOC4_SRTR_CNT_VAL_SHIFT 16
244 #define IOC4_SRTR_HZ 16000 /* SRTR clock frequency */
246 /* Serial port register map used for DMA and PIO serial I/O */
247 struct ioc4_serialregs {
257 /* IOC4 UART register map */
258 struct ioc4_uartregs {
261 char iir; /* read only */
262 char fcr; /* write only */
265 char ier; /* DLAB == 0 */
266 char dlm; /* DLAB == 1 */
269 char rbr; /* read only, DLAB == 0 */
270 char thr; /* write only, DLAB == 0 */
271 char dll; /* DLAB == 1 */
280 #define i4u_dll u1.dll
281 #define i4u_ier u2.ier
282 #define i4u_dlm u2.dlm
283 #define i4u_fcr u3.fcr
285 /* Serial port registers used for DMA serial I/O */
292 struct ioc4_serialregs port_0;
293 struct ioc4_serialregs port_1;
294 struct ioc4_serialregs port_2;
295 struct ioc4_serialregs port_3;
296 struct ioc4_uartregs uart_0;
297 struct ioc4_uartregs uart_1;
298 struct ioc4_uartregs uart_2;
299 struct ioc4_uartregs uart_3;
302 /* UART clock speed */
303 #define IOC4_SER_XIN_CLK_66 66666667
304 #define IOC4_SER_XIN_CLK_33 33333333
309 typedef void ioc4_intr_func_f(void *, uint32_t);
310 typedef ioc4_intr_func_f *ioc4_intr_func_t;
312 static unsigned int Num_of_ioc4_cards;
314 /* defining this will get you LOTS of great debug info */
315 //#define DEBUG_INTERRUPTS
316 #define DPRINT_CONFIG(_x...) ;
317 //#define DPRINT_CONFIG(_x...) printk _x
319 /* number of characters left in xmit buffer before we ask for more */
320 #define WAKEUP_CHARS 256
322 /* number of characters we want to transmit to the lower level at a time */
323 #define IOC4_MAX_CHARS 256
324 #define IOC4_FIFO_CHARS 255
326 /* Device name we're using */
327 #define DEVICE_NAME_RS232 "ttyIOC"
328 #define DEVICE_NAME_RS422 "ttyAIOC"
329 #define DEVICE_MAJOR 204
330 #define DEVICE_MINOR_RS232 50
331 #define DEVICE_MINOR_RS422 84
334 /* register offsets */
335 #define IOC4_SERIAL_OFFSET 0x300
337 /* flags for next_char_state */
338 #define NCS_BREAK 0x1
339 #define NCS_PARITY 0x2
340 #define NCS_FRAMING 0x4
341 #define NCS_OVERRUN 0x8
343 /* cause we need SOME parameters ... */
344 #define MIN_BAUD_SUPPORTED 1200
345 #define MAX_BAUD_SUPPORTED 115200
347 /* protocol types supported */
348 #define PROTO_RS232 3
349 #define PROTO_RS422 7
351 /* Notification types */
352 #define N_DATA_READY 0x01
353 #define N_OUTPUT_LOWAT 0x02
355 #define N_PARITY_ERROR 0x08
356 #define N_FRAMING_ERROR 0x10
357 #define N_OVERRUN_ERROR 0x20
361 #define N_ALL_INPUT (N_DATA_READY | N_BREAK | \
362 N_PARITY_ERROR | N_FRAMING_ERROR | \
363 N_OVERRUN_ERROR | N_DDCD | N_DCTS)
365 #define N_ALL_OUTPUT N_OUTPUT_LOWAT
367 #define N_ALL_ERRORS (N_PARITY_ERROR | N_FRAMING_ERROR | N_OVERRUN_ERROR)
369 #define N_ALL (N_DATA_READY | N_OUTPUT_LOWAT | N_BREAK | \
370 N_PARITY_ERROR | N_FRAMING_ERROR | \
371 N_OVERRUN_ERROR | N_DDCD | N_DCTS)
373 #define SER_DIVISOR(_x, clk) (((clk) + (_x) * 8) / ((_x) * 16))
374 #define DIVISOR_TO_BAUD(div, clk) ((clk) / 16 / (div))
377 #define LCR_MASK_BITS_CHAR (UART_LCR_WLEN5 | UART_LCR_WLEN6 \
378 | UART_LCR_WLEN7 | UART_LCR_WLEN8)
379 #define LCR_MASK_STOP_BITS (UART_LCR_STOP)
381 #define PENDING(_p) (readl(&(_p)->ip_mem->sio_ir.raw) & _p->ip_ienb)
382 #define READ_SIO_IR(_p) readl(&(_p)->ip_mem->sio_ir.raw)
384 /* Default to 4k buffers */
385 #ifdef IOC4_1K_BUFFERS
386 #define RING_BUF_SIZE 1024
387 #define IOC4_BUF_SIZE_BIT 0
388 #define PROD_CONS_MASK IOC4_PROD_CONS_PTR_1K
390 #define RING_BUF_SIZE 4096
391 #define IOC4_BUF_SIZE_BIT IOC4_SBBR_L_SIZE
392 #define PROD_CONS_MASK IOC4_PROD_CONS_PTR_4K
395 #define TOTAL_RING_BUF_SIZE (RING_BUF_SIZE * 4)
398 * This is the entry saved by the driver - one per card
401 #define UART_PORT_MIN 0
402 #define UART_PORT_RS232 UART_PORT_MIN
403 #define UART_PORT_RS422 1
404 #define UART_PORT_COUNT 2 /* one for each mode */
406 struct ioc4_control {
409 /* uart ports are allocated here - 1 for rs232, 1 for rs422 */
410 struct uart_port icp_uart_port[UART_PORT_COUNT];
411 /* Handy reference material */
412 struct ioc4_port *icp_port;
413 } ic_port[IOC4_NUM_SERIAL_PORTS];
414 struct ioc4_soft *ic_soft;
418 * per-IOC4 data structure
420 #define MAX_IOC4_INTR_ENTS (8 * sizeof(uint32_t))
422 struct ioc4_misc_regs __iomem *is_ioc4_misc_addr;
423 struct ioc4_serial __iomem *is_ioc4_serial_addr;
425 /* Each interrupt type has an entry in the array */
426 struct ioc4_intr_type {
429 * Each in-use entry in this array contains at least
430 * one nonzero bit in sd_bits; no two entries in this
431 * array have overlapping sd_bits values.
433 struct ioc4_intr_info {
435 ioc4_intr_func_f *sd_intr;
437 } is_intr_info[MAX_IOC4_INTR_ENTS];
439 /* Number of entries active in the above array */
440 atomic_t is_num_intrs;
441 } is_intr_type[IOC4_NUM_INTR_TYPES];
443 /* is_ir_lock must be held while
444 * modifying sio_ie values, so
445 * we can be sure that sio_ie is
446 * not changing when we read it
449 spinlock_t is_ir_lock; /* SIO_IE[SC] mod lock */
452 /* Local port info for each IOC4 serial ports */
454 struct uart_port *ip_port; /* current active port ptr */
455 /* Ptrs for all ports */
456 struct uart_port *ip_all_ports[UART_PORT_COUNT];
457 /* Back ptrs for this port */
458 struct ioc4_control *ip_control;
459 struct pci_dev *ip_pdev;
460 struct ioc4_soft *ip_ioc4_soft;
462 /* pci mem addresses */
463 struct ioc4_misc_regs __iomem *ip_mem;
464 struct ioc4_serial __iomem *ip_serial;
465 struct ioc4_serialregs __iomem *ip_serial_regs;
466 struct ioc4_uartregs __iomem *ip_uart_regs;
468 /* Ring buffer page for this port */
469 dma_addr_t ip_dma_ringbuf;
470 /* vaddr of ring buffer */
471 struct ring_buffer *ip_cpu_ringbuf;
473 /* Rings for this port */
474 struct ring *ip_inring;
475 struct ring *ip_outring;
477 /* Hook to port specific values */
478 struct hooks *ip_hooks;
482 /* Various rx/tx parameters */
487 /* Copy of notification bits */
490 /* Shadow copies of various registers so we don't need to PIO
491 * read them constantly
493 uint32_t ip_ienb; /* Enabled interrupts */
497 int ip_pci_bus_speed;
498 unsigned char ip_flags;
501 /* tx low water mark. We need to notify the driver whenever tx is getting
502 * close to empty so it can refill the tx buffer and keep things going.
503 * Let's assume that if we interrupt 1 ms before the tx goes idle, we'll
504 * have no trouble getting in more chars in time (I certainly hope so).
506 #define TX_LOWAT_LATENCY 1000
507 #define TX_LOWAT_HZ (1000000 / TX_LOWAT_LATENCY)
508 #define TX_LOWAT_CHARS(baud) (baud / 10 / TX_LOWAT_HZ)
511 #define INPUT_HIGH 0x01
513 #define LOWAT_WRITTEN 0x04
514 #define READ_ABORTED 0x08
515 #define PORT_ACTIVE 0x10
516 #define PORT_INACTIVE 0 /* This is the value when "off" */
519 /* Since each port has different register offsets and bitmasks
520 * for everything, we'll store those that we need in tables so we
521 * don't have to be constantly checking the port we are dealing with.
524 uint32_t intr_delta_dcd;
525 uint32_t intr_delta_cts;
527 uint32_t intr_rx_timer;
528 uint32_t intr_rx_high;
529 uint32_t intr_tx_explicit;
530 uint32_t intr_dma_error;
533 int rs422_select_pin;
536 static struct hooks hooks_array[IOC4_NUM_SERIAL_PORTS] = {
537 /* Values for port 0 */
539 IOC4_SIO_IR_S0_DELTA_DCD, IOC4_SIO_IR_S0_DELTA_CTS,
540 IOC4_SIO_IR_S0_TX_MT, IOC4_SIO_IR_S0_RX_TIMER,
541 IOC4_SIO_IR_S0_RX_HIGH, IOC4_SIO_IR_S0_TX_EXPLICIT,
542 IOC4_OTHER_IR_S0_MEMERR,
543 (IOC4_SIO_IR_S0_TX_MT | IOC4_SIO_IR_S0_RX_FULL |
544 IOC4_SIO_IR_S0_RX_HIGH | IOC4_SIO_IR_S0_RX_TIMER |
545 IOC4_SIO_IR_S0_DELTA_DCD | IOC4_SIO_IR_S0_DELTA_CTS |
546 IOC4_SIO_IR_S0_INT | IOC4_SIO_IR_S0_TX_EXPLICIT),
547 IOC4_SIO_IR_S0, IOC4_GPPR_UART0_MODESEL_PIN,
550 /* Values for port 1 */
552 IOC4_SIO_IR_S1_DELTA_DCD, IOC4_SIO_IR_S1_DELTA_CTS,
553 IOC4_SIO_IR_S1_TX_MT, IOC4_SIO_IR_S1_RX_TIMER,
554 IOC4_SIO_IR_S1_RX_HIGH, IOC4_SIO_IR_S1_TX_EXPLICIT,
555 IOC4_OTHER_IR_S1_MEMERR,
556 (IOC4_SIO_IR_S1_TX_MT | IOC4_SIO_IR_S1_RX_FULL |
557 IOC4_SIO_IR_S1_RX_HIGH | IOC4_SIO_IR_S1_RX_TIMER |
558 IOC4_SIO_IR_S1_DELTA_DCD | IOC4_SIO_IR_S1_DELTA_CTS |
559 IOC4_SIO_IR_S1_INT | IOC4_SIO_IR_S1_TX_EXPLICIT),
560 IOC4_SIO_IR_S1, IOC4_GPPR_UART1_MODESEL_PIN,
563 /* Values for port 2 */
565 IOC4_SIO_IR_S2_DELTA_DCD, IOC4_SIO_IR_S2_DELTA_CTS,
566 IOC4_SIO_IR_S2_TX_MT, IOC4_SIO_IR_S2_RX_TIMER,
567 IOC4_SIO_IR_S2_RX_HIGH, IOC4_SIO_IR_S2_TX_EXPLICIT,
568 IOC4_OTHER_IR_S2_MEMERR,
569 (IOC4_SIO_IR_S2_TX_MT | IOC4_SIO_IR_S2_RX_FULL |
570 IOC4_SIO_IR_S2_RX_HIGH | IOC4_SIO_IR_S2_RX_TIMER |
571 IOC4_SIO_IR_S2_DELTA_DCD | IOC4_SIO_IR_S2_DELTA_CTS |
572 IOC4_SIO_IR_S2_INT | IOC4_SIO_IR_S2_TX_EXPLICIT),
573 IOC4_SIO_IR_S2, IOC4_GPPR_UART2_MODESEL_PIN,
576 /* Values for port 3 */
578 IOC4_SIO_IR_S3_DELTA_DCD, IOC4_SIO_IR_S3_DELTA_CTS,
579 IOC4_SIO_IR_S3_TX_MT, IOC4_SIO_IR_S3_RX_TIMER,
580 IOC4_SIO_IR_S3_RX_HIGH, IOC4_SIO_IR_S3_TX_EXPLICIT,
581 IOC4_OTHER_IR_S3_MEMERR,
582 (IOC4_SIO_IR_S3_TX_MT | IOC4_SIO_IR_S3_RX_FULL |
583 IOC4_SIO_IR_S3_RX_HIGH | IOC4_SIO_IR_S3_RX_TIMER |
584 IOC4_SIO_IR_S3_DELTA_DCD | IOC4_SIO_IR_S3_DELTA_CTS |
585 IOC4_SIO_IR_S3_INT | IOC4_SIO_IR_S3_TX_EXPLICIT),
586 IOC4_SIO_IR_S3, IOC4_GPPR_UART3_MODESEL_PIN,
590 /* A ring buffer entry */
598 char data[4]; /* data bytes */
599 char sc[4]; /* status/control */
604 /* Test the valid bits in any of the 4 sc chars using "allsc" member */
605 #define RING_ANY_VALID \
606 ((uint32_t)(IOC4_RXSB_MODEM_VALID | IOC4_RXSB_DATA_VALID) * 0x01010101)
608 #define ring_sc u.s.sc
609 #define ring_data u.s.data
610 #define ring_allsc u.all.allsc
612 /* Number of entries per ring buffer. */
613 #define ENTRIES_PER_RING (RING_BUF_SIZE / (int) sizeof(struct ring_entry))
615 /* An individual ring */
617 struct ring_entry entries[ENTRIES_PER_RING];
620 /* The whole enchilada */
622 struct ring TX_0_OR_2;
623 struct ring RX_0_OR_2;
624 struct ring TX_1_OR_3;
625 struct ring RX_1_OR_3;
628 /* Get a ring from a port struct */
629 #define RING(_p, _wh) &(((struct ring_buffer *)((_p)->ip_cpu_ringbuf))->_wh)
631 /* Infinite loop detection.
633 #define MAXITER 10000000
636 static void receive_chars(struct uart_port *);
637 static void handle_intr(void *arg, uint32_t sio_ir);
640 * port_is_active - determines if this port is currently active
641 * @port: ptr to soft struct for this port
642 * @uart_port: uart port to test for
644 static inline int port_is_active(struct ioc4_port *port,
645 struct uart_port *uart_port)
648 if ((port->ip_flags & PORT_ACTIVE)
649 && (port->ip_port == uart_port))
657 * write_ireg - write the interrupt regs
658 * @ioc4_soft: ptr to soft struct for this port
659 * @val: value to write
660 * @which: which register
661 * @type: which ireg set
664 write_ireg(struct ioc4_soft *ioc4_soft, uint32_t val, int which, int type)
666 struct ioc4_misc_regs __iomem *mem = ioc4_soft->is_ioc4_misc_addr;
669 spin_lock_irqsave(&ioc4_soft->is_ir_lock, flags);
672 case IOC4_SIO_INTR_TYPE:
675 writel(val, &mem->sio_ies.raw);
679 writel(val, &mem->sio_iec.raw);
684 case IOC4_OTHER_INTR_TYPE:
687 writel(val, &mem->other_ies.raw);
691 writel(val, &mem->other_iec.raw);
699 spin_unlock_irqrestore(&ioc4_soft->is_ir_lock, flags);
703 * set_baud - Baud rate setting code
705 * @baud: baud rate to use
707 static int set_baud(struct ioc4_port *port, int baud)
712 unsigned short divisor;
713 struct ioc4_uartregs __iomem *uart;
715 divisor = SER_DIVISOR(baud, port->ip_pci_bus_speed);
718 actual_baud = DIVISOR_TO_BAUD(divisor, port->ip_pci_bus_speed);
720 diff = actual_baud - baud;
724 /* If we're within 1%, we've found a match */
725 if (diff * 100 > actual_baud)
728 uart = port->ip_uart_regs;
729 lcr = readb(&uart->i4u_lcr);
730 writeb(lcr | UART_LCR_DLAB, &uart->i4u_lcr);
731 writeb((unsigned char)divisor, &uart->i4u_dll);
732 writeb((unsigned char)(divisor >> 8), &uart->i4u_dlm);
733 writeb(lcr, &uart->i4u_lcr);
739 * get_ioc4_port - given a uart port, return the control structure
741 * @set: set this port as current
743 static struct ioc4_port *get_ioc4_port(struct uart_port *the_port, int set)
745 struct ioc4_driver_data *idd = dev_get_drvdata(the_port->dev);
746 struct ioc4_control *control = idd->idd_serial_data;
747 struct ioc4_port *port;
748 int port_num, port_type;
751 for ( port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS;
753 port = control->ic_port[port_num].icp_port;
756 for (port_type = UART_PORT_MIN;
757 port_type < UART_PORT_COUNT;
759 if (the_port == port->ip_all_ports
763 port->ip_port = the_port;
773 /* The IOC4 hardware provides no atomic way to determine if interrupts
774 * are pending since two reads are required to do so. The handler must
775 * read the SIO_IR and the SIO_IES, and take the logical and of the
776 * two. When this value is zero, all interrupts have been serviced and
777 * the handler may return.
779 * This has the unfortunate "hole" that, if some other CPU or
780 * some other thread or some higher level interrupt manages to
781 * modify SIO_IE between our reads of SIO_IR and SIO_IE, we may
782 * think we have observed SIO_IR&SIO_IE==0 when in fact this
783 * condition never really occurred.
785 * To solve this, we use a simple spinlock that must be held
786 * whenever modifying SIO_IE; holding this lock while observing
787 * both SIO_IR and SIO_IE guarantees that we do not falsely
788 * conclude that no enabled interrupts are pending.
791 static inline uint32_t
792 pending_intrs(struct ioc4_soft *soft, int type)
794 struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr;
798 BUG_ON(!((type == IOC4_SIO_INTR_TYPE)
799 || (type == IOC4_OTHER_INTR_TYPE)));
801 spin_lock_irqsave(&soft->is_ir_lock, flag);
804 case IOC4_SIO_INTR_TYPE:
805 intrs = readl(&mem->sio_ir.raw) & readl(&mem->sio_ies.raw);
808 case IOC4_OTHER_INTR_TYPE:
809 intrs = readl(&mem->other_ir.raw) & readl(&mem->other_ies.raw);
811 /* Don't process any ATA interrupte */
812 intrs &= ~(IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR);
818 spin_unlock_irqrestore(&soft->is_ir_lock, flag);
823 * port_init - Initialize the sio and ioc4 hardware for a given port
824 * called per port from attach...
825 * @port: port to initialize
827 static int inline port_init(struct ioc4_port *port)
830 struct hooks *hooks = port->ip_hooks;
831 struct ioc4_uartregs __iomem *uart;
833 /* Idle the IOC4 serial interface */
834 writel(IOC4_SSCR_RESET, &port->ip_serial_regs->sscr);
836 /* Wait until any pending bus activity for this port has ceased */
838 sio_cr = readl(&port->ip_mem->sio_cr.raw);
839 while (!(sio_cr & IOC4_SIO_CR_SIO_DIAG_IDLE));
841 /* Finish reset sequence */
842 writel(0, &port->ip_serial_regs->sscr);
844 /* Once RESET is done, reload cached tx_prod and rx_cons values
845 * and set rings to empty by making prod == cons
847 port->ip_tx_prod = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
848 writel(port->ip_tx_prod, &port->ip_serial_regs->stpir);
849 port->ip_rx_cons = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
850 writel(port->ip_rx_cons | IOC4_SRCIR_ARM, &port->ip_serial_regs->srcir);
852 /* Disable interrupts for this 16550 */
853 uart = port->ip_uart_regs;
854 writeb(0, &uart->i4u_lcr);
855 writeb(0, &uart->i4u_ier);
857 /* Set the default baud */
858 set_baud(port, port->ip_baud);
860 /* Set line control to 8 bits no parity */
861 writeb(UART_LCR_WLEN8 | 0, &uart->i4u_lcr);
862 /* UART_LCR_STOP == 1 stop */
864 /* Enable the FIFOs */
865 writeb(UART_FCR_ENABLE_FIFO, &uart->i4u_fcr);
866 /* then reset 16550 FIFOs */
867 writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
870 /* Clear modem control register */
871 writeb(0, &uart->i4u_mcr);
873 /* Clear deltas in modem status register */
874 readb(&uart->i4u_msr);
876 /* Only do this once per port pair */
877 if (port->ip_hooks == &hooks_array[0]
878 || port->ip_hooks == &hooks_array[2]) {
879 unsigned long ring_pci_addr;
880 uint32_t __iomem *sbbr_l;
881 uint32_t __iomem *sbbr_h;
883 if (port->ip_hooks == &hooks_array[0]) {
884 sbbr_l = &port->ip_serial->sbbr01_l;
885 sbbr_h = &port->ip_serial->sbbr01_h;
887 sbbr_l = &port->ip_serial->sbbr23_l;
888 sbbr_h = &port->ip_serial->sbbr23_h;
891 ring_pci_addr = (unsigned long __iomem)port->ip_dma_ringbuf;
892 DPRINT_CONFIG(("%s: ring_pci_addr 0x%lx\n",
893 __func__, ring_pci_addr));
895 writel((unsigned int)((uint64_t)ring_pci_addr >> 32), sbbr_h);
896 writel((unsigned int)ring_pci_addr | IOC4_BUF_SIZE_BIT, sbbr_l);
899 /* Set the receive timeout value to 10 msec */
900 writel(IOC4_SRTR_HZ / 100, &port->ip_serial_regs->srtr);
902 /* Set rx threshold, enable DMA */
903 /* Set high water mark at 3/4 of full ring */
904 port->ip_sscr = (ENTRIES_PER_RING * 3 / 4);
905 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
907 /* Disable and clear all serial related interrupt bits */
908 write_ireg(port->ip_ioc4_soft, hooks->intr_clear,
909 IOC4_W_IEC, IOC4_SIO_INTR_TYPE);
910 port->ip_ienb &= ~hooks->intr_clear;
911 writel(hooks->intr_clear, &port->ip_mem->sio_ir.raw);
916 * handle_dma_error_intr - service any pending DMA error interrupts for the
917 * given port - 2nd level called via sd_intr
919 * @other_ir: ioc4regs
921 static void handle_dma_error_intr(void *arg, uint32_t other_ir)
923 struct ioc4_port *port = (struct ioc4_port *)arg;
924 struct hooks *hooks = port->ip_hooks;
927 spin_lock_irqsave(&port->ip_lock, flags);
929 /* ACK the interrupt */
930 writel(hooks->intr_dma_error, &port->ip_mem->other_ir.raw);
932 if (readl(&port->ip_mem->pci_err_addr_l.raw) & IOC4_PCI_ERR_ADDR_VLD) {
934 "PCI error address is 0x%llx, "
935 "master is serial port %c %s\n",
936 (((uint64_t)readl(&port->ip_mem->pci_err_addr_h)
938 | readl(&port->ip_mem->pci_err_addr_l.raw))
939 & IOC4_PCI_ERR_ADDR_ADDR_MSK, '1' +
940 ((char)(readl(&port->ip_mem->pci_err_addr_l.raw) &
941 IOC4_PCI_ERR_ADDR_MST_NUM_MSK) >> 1),
942 (readl(&port->ip_mem->pci_err_addr_l.raw)
943 & IOC4_PCI_ERR_ADDR_MST_TYP_MSK)
946 if (readl(&port->ip_mem->pci_err_addr_l.raw)
947 & IOC4_PCI_ERR_ADDR_MUL_ERR) {
949 "Multiple errors occurred\n");
952 spin_unlock_irqrestore(&port->ip_lock, flags);
954 /* Re-enable DMA error interrupts */
955 write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error, IOC4_W_IES,
956 IOC4_OTHER_INTR_TYPE);
960 * intr_connect - interrupt connect function
961 * @soft: soft struct for this card
962 * @type: interrupt type
963 * @intrbits: bit pattern to set
964 * @intr: handler function
968 intr_connect(struct ioc4_soft *soft, int type,
969 uint32_t intrbits, ioc4_intr_func_f * intr, void *info)
972 struct ioc4_intr_info *intr_ptr;
974 BUG_ON(!((type == IOC4_SIO_INTR_TYPE)
975 || (type == IOC4_OTHER_INTR_TYPE)));
977 i = atomic_inc_return(&soft-> is_intr_type[type].is_num_intrs) - 1;
978 BUG_ON(!(i < MAX_IOC4_INTR_ENTS || (printk("i %d\n", i), 0)));
980 /* Save off the lower level interrupt handler */
981 intr_ptr = &soft->is_intr_type[type].is_intr_info[i];
982 intr_ptr->sd_bits = intrbits;
983 intr_ptr->sd_intr = intr;
984 intr_ptr->sd_info = info;
988 * ioc4_intr - Top level IOC4 interrupt handler.
993 static irqreturn_t ioc4_intr(int irq, void *arg)
995 struct ioc4_soft *soft;
996 uint32_t this_ir, this_mir;
997 int xx, num_intrs = 0;
1000 struct ioc4_intr_info *intr_info;
1003 for (intr_type = 0; intr_type < IOC4_NUM_INTR_TYPES; intr_type++) {
1004 num_intrs = (int)atomic_read(
1005 &soft->is_intr_type[intr_type].is_num_intrs);
1007 this_mir = this_ir = pending_intrs(soft, intr_type);
1009 /* Farm out the interrupt to the various drivers depending on
1010 * which interrupt bits are set.
1012 for (xx = 0; xx < num_intrs; xx++) {
1013 intr_info = &soft->is_intr_type[intr_type].is_intr_info[xx];
1014 this_mir = this_ir & intr_info->sd_bits;
1016 /* Disable owned interrupts, call handler */
1018 write_ireg(soft, intr_info->sd_bits, IOC4_W_IEC,
1020 intr_info->sd_intr(intr_info->sd_info, this_mir);
1021 this_ir &= ~this_mir;
1025 #ifdef DEBUG_INTERRUPTS
1027 struct ioc4_misc_regs __iomem *mem = soft->is_ioc4_misc_addr;
1030 spin_lock_irqsave(&soft->is_ir_lock, flag);
1031 printk ("%s : %d : mem 0x%p sio_ir 0x%x sio_ies 0x%x "
1032 "other_ir 0x%x other_ies 0x%x mask 0x%x\n",
1034 (void *)mem, readl(&mem->sio_ir.raw),
1035 readl(&mem->sio_ies.raw),
1036 readl(&mem->other_ir.raw),
1037 readl(&mem->other_ies.raw),
1038 IOC4_OTHER_IR_ATA_INT | IOC4_OTHER_IR_ATA_MEMERR);
1039 spin_unlock_irqrestore(&soft->is_ir_lock, flag);
1042 return handled ? IRQ_HANDLED : IRQ_NONE;
1046 * ioc4_attach_local - Device initialization.
1047 * Called at *_attach() time for each
1048 * IOC4 with serial ports in the system.
1049 * @idd: Master module data for this IOC4
1051 static int inline ioc4_attach_local(struct ioc4_driver_data *idd)
1053 struct ioc4_port *port;
1054 struct ioc4_port *ports[IOC4_NUM_SERIAL_PORTS];
1056 uint16_t ioc4_revid_min = 62;
1057 uint16_t ioc4_revid;
1058 struct pci_dev *pdev = idd->idd_pdev;
1059 struct ioc4_control* control = idd->idd_serial_data;
1060 struct ioc4_soft *soft = control->ic_soft;
1061 void __iomem *ioc4_misc = idd->idd_misc_regs;
1062 void __iomem *ioc4_serial = soft->is_ioc4_serial_addr;
1064 /* IOC4 firmware must be at least rev 62 */
1065 pci_read_config_word(pdev, PCI_COMMAND_SPECIAL, &ioc4_revid);
1067 printk(KERN_INFO "IOC4 firmware revision %d\n", ioc4_revid);
1068 if (ioc4_revid < ioc4_revid_min) {
1070 "IOC4 serial not supported on firmware rev %d, "
1071 "please upgrade to rev %d or higher\n",
1072 ioc4_revid, ioc4_revid_min);
1075 BUG_ON(ioc4_misc == NULL);
1076 BUG_ON(ioc4_serial == NULL);
1078 /* Create port structures for each port */
1079 for (port_number = 0; port_number < IOC4_NUM_SERIAL_PORTS;
1081 port = kzalloc(sizeof(struct ioc4_port), GFP_KERNEL);
1084 "IOC4 serial memory not available for port\n");
1087 spin_lock_init(&port->ip_lock);
1089 /* we need to remember the previous ones, to point back to
1090 * them farther down - setting up the ring buffers.
1092 ports[port_number] = port;
1094 /* Allocate buffers and jumpstart the hardware. */
1095 control->ic_port[port_number].icp_port = port;
1096 port->ip_ioc4_soft = soft;
1097 port->ip_pdev = pdev;
1099 /* Use baud rate calculations based on detected PCI
1100 * bus speed. Simply test whether the PCI clock is
1101 * running closer to 66MHz or 33MHz.
1103 if (idd->count_period/IOC4_EXTINT_COUNT_DIVISOR < 20) {
1104 port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_66;
1106 port->ip_pci_bus_speed = IOC4_SER_XIN_CLK_33;
1108 port->ip_baud = 9600;
1109 port->ip_control = control;
1110 port->ip_mem = ioc4_misc;
1111 port->ip_serial = ioc4_serial;
1113 /* point to the right hook */
1114 port->ip_hooks = &hooks_array[port_number];
1116 /* Get direct hooks to the serial regs and uart regs
1119 switch (port_number) {
1121 port->ip_serial_regs = &(port->ip_serial->port_0);
1122 port->ip_uart_regs = &(port->ip_serial->uart_0);
1125 port->ip_serial_regs = &(port->ip_serial->port_1);
1126 port->ip_uart_regs = &(port->ip_serial->uart_1);
1129 port->ip_serial_regs = &(port->ip_serial->port_2);
1130 port->ip_uart_regs = &(port->ip_serial->uart_2);
1134 port->ip_serial_regs = &(port->ip_serial->port_3);
1135 port->ip_uart_regs = &(port->ip_serial->uart_3);
1139 /* ring buffers are 1 to a pair of ports */
1140 if (port_number && (port_number & 1)) {
1141 /* odd use the evens buffer */
1142 port->ip_dma_ringbuf =
1143 ports[port_number - 1]->ip_dma_ringbuf;
1144 port->ip_cpu_ringbuf =
1145 ports[port_number - 1]->ip_cpu_ringbuf;
1146 port->ip_inring = RING(port, RX_1_OR_3);
1147 port->ip_outring = RING(port, TX_1_OR_3);
1150 if (port->ip_dma_ringbuf == 0) {
1151 port->ip_cpu_ringbuf = pci_alloc_consistent
1152 (pdev, TOTAL_RING_BUF_SIZE,
1153 &port->ip_dma_ringbuf);
1156 BUG_ON(!((((int64_t)port->ip_dma_ringbuf) &
1157 (TOTAL_RING_BUF_SIZE - 1)) == 0));
1158 DPRINT_CONFIG(("%s : ip_cpu_ringbuf 0x%p "
1159 "ip_dma_ringbuf 0x%p\n",
1161 (void *)port->ip_cpu_ringbuf,
1162 (void *)port->ip_dma_ringbuf));
1163 port->ip_inring = RING(port, RX_0_OR_2);
1164 port->ip_outring = RING(port, TX_0_OR_2);
1166 DPRINT_CONFIG(("%s : port %d [addr 0x%p] control 0x%p",
1168 port_number, (void *)port, (void *)control));
1169 DPRINT_CONFIG((" ip_serial_regs 0x%p ip_uart_regs 0x%p\n",
1170 (void *)port->ip_serial_regs,
1171 (void *)port->ip_uart_regs));
1173 /* Initialize the hardware for IOC4 */
1176 DPRINT_CONFIG(("%s: port_number %d port 0x%p inring 0x%p "
1179 port_number, (void *)port,
1180 (void *)port->ip_inring,
1181 (void *)port->ip_outring));
1183 /* Attach interrupt handlers */
1184 intr_connect(soft, IOC4_SIO_INTR_TYPE,
1185 GET_SIO_IR(port_number),
1188 intr_connect(soft, IOC4_OTHER_INTR_TYPE,
1189 GET_OTHER_IR(port_number),
1190 handle_dma_error_intr, port);
1196 * enable_intrs - enable interrupts
1197 * @port: port to enable
1198 * @mask: mask to use
1200 static void enable_intrs(struct ioc4_port *port, uint32_t mask)
1202 struct hooks *hooks = port->ip_hooks;
1204 if ((port->ip_ienb & mask) != mask) {
1205 write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IES,
1206 IOC4_SIO_INTR_TYPE);
1207 port->ip_ienb |= mask;
1211 write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error,
1212 IOC4_W_IES, IOC4_OTHER_INTR_TYPE);
1216 * local_open - local open a port
1217 * @port: port to open
1219 static inline int local_open(struct ioc4_port *port)
1223 port->ip_flags = PORT_ACTIVE;
1225 /* Pause the DMA interface if necessary */
1226 if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
1227 writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE,
1228 &port->ip_serial_regs->sscr);
1229 while((readl(&port->ip_serial_regs-> sscr)
1230 & IOC4_SSCR_PAUSE_STATE) == 0) {
1232 if (spiniter > MAXITER) {
1233 port->ip_flags = PORT_INACTIVE;
1239 /* Reset the input fifo. If the uart received chars while the port
1240 * was closed and DMA is not enabled, the uart may have a bunch of
1241 * chars hanging around in its rx fifo which will not be discarded
1242 * by rclr in the upper layer. We must get rid of them here.
1244 writeb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR,
1245 &port->ip_uart_regs->i4u_fcr);
1247 writeb(UART_LCR_WLEN8, &port->ip_uart_regs->i4u_lcr);
1248 /* UART_LCR_STOP == 1 stop */
1250 /* Re-enable DMA, set default threshold to intr whenever there is
1253 port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD;
1254 port->ip_sscr |= 1; /* default threshold */
1256 /* Plug in the new sscr. This implicitly clears the DMA_PAUSE
1257 * flag if it was set above
1259 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
1260 port->ip_tx_lowat = 1;
1265 * set_rx_timeout - Set rx timeout and threshold values.
1266 * @port: port to use
1267 * @timeout: timeout value in ticks
1269 static inline int set_rx_timeout(struct ioc4_port *port, int timeout)
1273 port->ip_rx_timeout = timeout;
1275 /* Timeout is in ticks. Let's figure out how many chars we
1276 * can receive at the current baud rate in that interval
1277 * and set the rx threshold to that amount. There are 4 chars
1278 * per ring entry, so we'll divide the number of chars that will
1279 * arrive in timeout by 4.
1280 * So .... timeout * baud / 10 / HZ / 4, with HZ = 100.
1282 threshold = timeout * port->ip_baud / 4000;
1284 threshold = 1; /* otherwise we'll intr all the time! */
1286 if ((unsigned)threshold > (unsigned)IOC4_SSCR_RX_THRESHOLD)
1289 port->ip_sscr &= ~IOC4_SSCR_RX_THRESHOLD;
1290 port->ip_sscr |= threshold;
1292 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
1294 /* Now set the rx timeout to the given value
1295 * again timeout * IOC4_SRTR_HZ / HZ
1297 timeout = timeout * IOC4_SRTR_HZ / 100;
1298 if (timeout > IOC4_SRTR_CNT)
1299 timeout = IOC4_SRTR_CNT;
1301 writel(timeout, &port->ip_serial_regs->srtr);
1306 * config_port - config the hardware
1307 * @port: port to config
1308 * @baud: baud rate for the port
1309 * @byte_size: data size
1310 * @stop_bits: number of stop bits
1311 * @parenb: parity enable ?
1312 * @parodd: odd parity ?
1315 config_port(struct ioc4_port *port,
1316 int baud, int byte_size, int stop_bits, int parenb, int parodd)
1321 DPRINT_CONFIG(("%s: baud %d byte_size %d stop %d parenb %d parodd %d\n",
1322 __func__, baud, byte_size, stop_bits, parenb, parodd));
1324 if (set_baud(port, baud))
1327 switch (byte_size) {
1329 sizebits = UART_LCR_WLEN5;
1332 sizebits = UART_LCR_WLEN6;
1335 sizebits = UART_LCR_WLEN7;
1338 sizebits = UART_LCR_WLEN8;
1344 /* Pause the DMA interface if necessary */
1345 if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
1346 writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE,
1347 &port->ip_serial_regs->sscr);
1348 while((readl(&port->ip_serial_regs->sscr)
1349 & IOC4_SSCR_PAUSE_STATE) == 0) {
1351 if (spiniter > MAXITER)
1356 /* Clear relevant fields in lcr */
1357 lcr = readb(&port->ip_uart_regs->i4u_lcr);
1358 lcr &= ~(LCR_MASK_BITS_CHAR | UART_LCR_EPAR |
1359 UART_LCR_PARITY | LCR_MASK_STOP_BITS);
1361 /* Set byte size in lcr */
1366 lcr |= UART_LCR_PARITY;
1368 lcr |= UART_LCR_EPAR;
1373 lcr |= UART_LCR_STOP /* 2 stop bits */ ;
1375 writeb(lcr, &port->ip_uart_regs->i4u_lcr);
1377 /* Re-enable the DMA interface if necessary */
1378 if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
1379 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
1381 port->ip_baud = baud;
1383 /* When we get within this number of ring entries of filling the
1384 * entire ring on tx, place an EXPLICIT intr to generate a lowat
1385 * notification when output has drained.
1387 port->ip_tx_lowat = (TX_LOWAT_CHARS(baud) + 3) / 4;
1388 if (port->ip_tx_lowat == 0)
1389 port->ip_tx_lowat = 1;
1391 set_rx_timeout(port, 2);
1397 * do_write - Write bytes to the port. Returns the number of bytes
1398 * actually written. Called from transmit_chars
1399 * @port: port to use
1400 * @buf: the stuff to write
1401 * @len: how many bytes in 'buf'
1403 static inline int do_write(struct ioc4_port *port, char *buf, int len)
1405 int prod_ptr, cons_ptr, total = 0;
1406 struct ring *outring;
1407 struct ring_entry *entry;
1408 struct hooks *hooks = port->ip_hooks;
1410 BUG_ON(!(len >= 0));
1412 prod_ptr = port->ip_tx_prod;
1413 cons_ptr = readl(&port->ip_serial_regs->stcir) & PROD_CONS_MASK;
1414 outring = port->ip_outring;
1416 /* Maintain a 1-entry red-zone. The ring buffer is full when
1417 * (cons - prod) % ring_size is 1. Rather than do this subtraction
1418 * in the body of the loop, I'll do it now.
1420 cons_ptr = (cons_ptr - (int)sizeof(struct ring_entry)) & PROD_CONS_MASK;
1422 /* Stuff the bytes into the output */
1423 while ((prod_ptr != cons_ptr) && (len > 0)) {
1426 /* Get 4 bytes (one ring entry) at a time */
1427 entry = (struct ring_entry *)((caddr_t) outring + prod_ptr);
1429 /* Invalidate all entries */
1430 entry->ring_allsc = 0;
1432 /* Copy in some bytes */
1433 for (xx = 0; (xx < 4) && (len > 0); xx++) {
1434 entry->ring_data[xx] = *buf++;
1435 entry->ring_sc[xx] = IOC4_TXCB_VALID;
1440 /* If we are within some small threshold of filling up the
1441 * entire ring buffer, we must place an EXPLICIT intr here
1442 * to generate a lowat interrupt in case we subsequently
1443 * really do fill up the ring and the caller goes to sleep.
1444 * No need to place more than one though.
1446 if (!(port->ip_flags & LOWAT_WRITTEN) &&
1447 ((cons_ptr - prod_ptr) & PROD_CONS_MASK)
1448 <= port->ip_tx_lowat
1449 * (int)sizeof(struct ring_entry)) {
1450 port->ip_flags |= LOWAT_WRITTEN;
1451 entry->ring_sc[0] |= IOC4_TXCB_INT_WHEN_DONE;
1454 /* Go on to next entry */
1455 prod_ptr += sizeof(struct ring_entry);
1456 prod_ptr &= PROD_CONS_MASK;
1459 /* If we sent something, start DMA if necessary */
1460 if (total > 0 && !(port->ip_sscr & IOC4_SSCR_DMA_EN)) {
1461 port->ip_sscr |= IOC4_SSCR_DMA_EN;
1462 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
1465 /* Store the new producer pointer. If tx is disabled, we stuff the
1466 * data into the ring buffer, but we don't actually start tx.
1468 if (!uart_tx_stopped(port->ip_port)) {
1469 writel(prod_ptr, &port->ip_serial_regs->stpir);
1471 /* If we are now transmitting, enable tx_mt interrupt so we
1472 * can disable DMA if necessary when the tx finishes.
1475 enable_intrs(port, hooks->intr_tx_mt);
1477 port->ip_tx_prod = prod_ptr;
1482 * disable_intrs - disable interrupts
1483 * @port: port to enable
1484 * @mask: mask to use
1486 static void disable_intrs(struct ioc4_port *port, uint32_t mask)
1488 struct hooks *hooks = port->ip_hooks;
1490 if (port->ip_ienb & mask) {
1491 write_ireg(port->ip_ioc4_soft, mask, IOC4_W_IEC,
1492 IOC4_SIO_INTR_TYPE);
1493 port->ip_ienb &= ~mask;
1497 write_ireg(port->ip_ioc4_soft, hooks->intr_dma_error,
1498 IOC4_W_IEC, IOC4_OTHER_INTR_TYPE);
1502 * set_notification - Modify event notification
1503 * @port: port to use
1504 * @mask: events mask
1507 static int set_notification(struct ioc4_port *port, int mask, int set_on)
1509 struct hooks *hooks = port->ip_hooks;
1510 uint32_t intrbits, sscrbits;
1514 intrbits = sscrbits = 0;
1516 if (mask & N_DATA_READY)
1517 intrbits |= (hooks->intr_rx_timer | hooks->intr_rx_high);
1518 if (mask & N_OUTPUT_LOWAT)
1519 intrbits |= hooks->intr_tx_explicit;
1520 if (mask & N_DDCD) {
1521 intrbits |= hooks->intr_delta_dcd;
1522 sscrbits |= IOC4_SSCR_RX_RING_DCD;
1525 intrbits |= hooks->intr_delta_cts;
1528 enable_intrs(port, intrbits);
1529 port->ip_notify |= mask;
1530 port->ip_sscr |= sscrbits;
1532 disable_intrs(port, intrbits);
1533 port->ip_notify &= ~mask;
1534 port->ip_sscr &= ~sscrbits;
1537 /* We require DMA if either DATA_READY or DDCD notification is
1538 * currently requested. If neither of these is requested and
1539 * there is currently no tx in progress, DMA may be disabled.
1541 if (port->ip_notify & (N_DATA_READY | N_DDCD))
1542 port->ip_sscr |= IOC4_SSCR_DMA_EN;
1543 else if (!(port->ip_ienb & hooks->intr_tx_mt))
1544 port->ip_sscr &= ~IOC4_SSCR_DMA_EN;
1546 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
1551 * set_mcr - set the master control reg
1552 * @the_port: port to use
1554 * @mask2: shadow mask
1556 static inline int set_mcr(struct uart_port *the_port,
1557 int mask1, int mask2)
1559 struct ioc4_port *port = get_ioc4_port(the_port, 0);
1567 /* Pause the DMA interface if necessary */
1568 if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
1569 writel(port->ip_sscr | IOC4_SSCR_DMA_PAUSE,
1570 &port->ip_serial_regs->sscr);
1571 while ((readl(&port->ip_serial_regs->sscr)
1572 & IOC4_SSCR_PAUSE_STATE) == 0) {
1574 if (spiniter > MAXITER)
1578 shadow = readl(&port->ip_serial_regs->shadow);
1579 mcr = (shadow & 0xff000000) >> 24;
1585 writeb(mcr, &port->ip_uart_regs->i4u_mcr);
1586 writel(shadow, &port->ip_serial_regs->shadow);
1588 /* Re-enable the DMA interface if necessary */
1589 if (port->ip_sscr & IOC4_SSCR_DMA_EN) {
1590 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
1596 * ioc4_set_proto - set the protocol for the port
1597 * @port: port to use
1598 * @proto: protocol to use
1600 static int ioc4_set_proto(struct ioc4_port *port, int proto)
1602 struct hooks *hooks = port->ip_hooks;
1606 /* Clear the appropriate GIO pin */
1607 writel(0, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw));
1611 /* Set the appropriate GIO pin */
1612 writel(1, (&port->ip_mem->gppr[hooks->rs422_select_pin].raw));
1622 * transmit_chars - upper level write, called with ip_lock
1623 * @the_port: port to write
1625 static void transmit_chars(struct uart_port *the_port)
1627 int xmit_count, tail, head;
1630 struct tty_struct *tty;
1631 struct ioc4_port *port = get_ioc4_port(the_port, 0);
1632 struct uart_state *state;
1639 state = the_port->state;
1640 tty = state->port.tty;
1642 if (uart_circ_empty(&state->xmit) || uart_tx_stopped(the_port)) {
1643 /* Nothing to do or hw stopped */
1644 set_notification(port, N_ALL_OUTPUT, 0);
1648 head = state->xmit.head;
1649 tail = state->xmit.tail;
1650 start = (char *)&state->xmit.buf[tail];
1652 /* write out all the data or until the end of the buffer */
1653 xmit_count = (head < tail) ? (UART_XMIT_SIZE - tail) : (head - tail);
1654 if (xmit_count > 0) {
1655 result = do_write(port, start, xmit_count);
1658 xmit_count -= result;
1659 the_port->icount.tx += result;
1660 /* advance the pointers */
1662 tail &= UART_XMIT_SIZE - 1;
1663 state->xmit.tail = tail;
1664 start = (char *)&state->xmit.buf[tail];
1667 if (uart_circ_chars_pending(&state->xmit) < WAKEUP_CHARS)
1668 uart_write_wakeup(the_port);
1670 if (uart_circ_empty(&state->xmit)) {
1671 set_notification(port, N_OUTPUT_LOWAT, 0);
1673 set_notification(port, N_OUTPUT_LOWAT, 1);
1678 * ioc4_change_speed - change the speed of the port
1679 * @the_port: port to change
1680 * @new_termios: new termios settings
1681 * @old_termios: old termios settings
1684 ioc4_change_speed(struct uart_port *the_port,
1685 struct ktermios *new_termios, struct ktermios *old_termios)
1687 struct ioc4_port *port = get_ioc4_port(the_port, 0);
1689 unsigned cflag, iflag;
1690 int new_parity = 0, new_parity_enable = 0, new_stop = 0, new_data = 8;
1691 struct uart_state *state = the_port->state;
1693 cflag = new_termios->c_cflag;
1694 iflag = new_termios->c_iflag;
1696 switch (cflag & CSIZE) {
1714 /* cuz we always need a default ... */
1719 if (cflag & CSTOPB) {
1723 if (cflag & PARENB) {
1725 new_parity_enable = 1;
1729 baud = uart_get_baud_rate(the_port, new_termios, old_termios,
1730 MIN_BAUD_SUPPORTED, MAX_BAUD_SUPPORTED);
1731 DPRINT_CONFIG(("%s: returned baud %d\n", __func__, baud));
1733 /* default is 9600 */
1737 if (!the_port->fifosize)
1738 the_port->fifosize = IOC4_FIFO_CHARS;
1739 the_port->timeout = ((the_port->fifosize * HZ * bits) / (baud / 10));
1740 the_port->timeout += HZ / 50; /* Add .02 seconds of slop */
1742 the_port->ignore_status_mask = N_ALL_INPUT;
1744 state->port.low_latency = 1;
1747 the_port->ignore_status_mask &= ~(N_PARITY_ERROR
1749 if (iflag & IGNBRK) {
1750 the_port->ignore_status_mask &= ~N_BREAK;
1752 the_port->ignore_status_mask &= ~N_OVERRUN_ERROR;
1754 if (!(cflag & CREAD)) {
1755 /* ignore everything */
1756 the_port->ignore_status_mask &= ~N_DATA_READY;
1759 if (cflag & CRTSCTS) {
1760 port->ip_sscr |= IOC4_SSCR_HFC_EN;
1763 port->ip_sscr &= ~IOC4_SSCR_HFC_EN;
1765 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
1767 /* Set the configuration and proper notification call */
1768 DPRINT_CONFIG(("%s : port 0x%p cflag 0%o "
1769 "config_port(baud %d data %d stop %d p enable %d parity %d),"
1770 " notification 0x%x\n",
1771 __func__, (void *)port, cflag, baud, new_data, new_stop,
1772 new_parity_enable, new_parity, the_port->ignore_status_mask));
1774 if ((config_port(port, baud, /* baud */
1775 new_data, /* byte size */
1776 new_stop, /* stop bits */
1777 new_parity_enable, /* set parity */
1778 new_parity)) >= 0) { /* parity 1==odd */
1779 set_notification(port, the_port->ignore_status_mask, 1);
1784 * ic4_startup_local - Start up the serial port - returns >= 0 if no errors
1785 * @the_port: Port to operate on
1787 static inline int ic4_startup_local(struct uart_port *the_port)
1789 struct ioc4_port *port;
1790 struct uart_state *state;
1795 port = get_ioc4_port(the_port, 0);
1799 state = the_port->state;
1803 /* set the protocol - mapbase has the port type */
1804 ioc4_set_proto(port, the_port->mapbase);
1806 /* set the speed of the serial port */
1807 ioc4_change_speed(the_port, &state->port.tty->termios,
1808 (struct ktermios *)0);
1814 * ioc4_cb_output_lowat - called when the output low water mark is hit
1815 * @the_port: port to output
1817 static void ioc4_cb_output_lowat(struct uart_port *the_port)
1819 unsigned long pflags;
1821 /* ip_lock is set on the call here */
1823 spin_lock_irqsave(&the_port->lock, pflags);
1824 transmit_chars(the_port);
1825 spin_unlock_irqrestore(&the_port->lock, pflags);
1830 * handle_intr - service any interrupts for the given port - 2nd level
1831 * called via sd_intr
1835 static void handle_intr(void *arg, uint32_t sio_ir)
1837 struct ioc4_port *port = (struct ioc4_port *)arg;
1838 struct hooks *hooks = port->ip_hooks;
1839 unsigned int rx_high_rd_aborted = 0;
1840 unsigned long flags;
1841 struct uart_port *the_port;
1844 /* Possible race condition here: The tx_mt interrupt bit may be
1845 * cleared without the intervention of the interrupt handler,
1846 * e.g. by a write. If the top level interrupt handler reads a
1847 * tx_mt, then some other processor does a write, starting up
1848 * output, then we come in here, see the tx_mt and stop DMA, the
1849 * output started by the other processor will hang. Thus we can
1850 * only rely on tx_mt being legitimate if it is read while the
1851 * port lock is held. Therefore this bit must be ignored in the
1852 * passed in interrupt mask which was read by the top level
1853 * interrupt handler since the port lock was not held at the time
1854 * it was read. We can only rely on this bit being accurate if it
1855 * is read while the port lock is held. So we'll clear it for now,
1856 * and reload it later once we have the port lock.
1858 sio_ir &= ~(hooks->intr_tx_mt);
1860 spin_lock_irqsave(&port->ip_lock, flags);
1862 loop_counter = MAXITER; /* to avoid hangs */
1867 if ( loop_counter-- <= 0 ) {
1868 printk(KERN_WARNING "IOC4 serial: "
1869 "possible hang condition/"
1870 "port stuck on interrupt.\n");
1874 /* Handle a DCD change */
1875 if (sio_ir & hooks->intr_delta_dcd) {
1876 /* ACK the interrupt */
1877 writel(hooks->intr_delta_dcd,
1878 &port->ip_mem->sio_ir.raw);
1880 shadow = readl(&port->ip_serial_regs->shadow);
1882 if ((port->ip_notify & N_DDCD)
1883 && (shadow & IOC4_SHADOW_DCD)
1884 && (port->ip_port)) {
1885 the_port = port->ip_port;
1886 the_port->icount.dcd = 1;
1887 wake_up_interruptible
1888 (&the_port->state->port.delta_msr_wait);
1889 } else if ((port->ip_notify & N_DDCD)
1890 && !(shadow & IOC4_SHADOW_DCD)) {
1891 /* Flag delta DCD/no DCD */
1892 port->ip_flags |= DCD_ON;
1896 /* Handle a CTS change */
1897 if (sio_ir & hooks->intr_delta_cts) {
1898 /* ACK the interrupt */
1899 writel(hooks->intr_delta_cts,
1900 &port->ip_mem->sio_ir.raw);
1902 shadow = readl(&port->ip_serial_regs->shadow);
1904 if ((port->ip_notify & N_DCTS)
1905 && (port->ip_port)) {
1906 the_port = port->ip_port;
1907 the_port->icount.cts =
1908 (shadow & IOC4_SHADOW_CTS) ? 1 : 0;
1909 wake_up_interruptible
1910 (&the_port->state->port.delta_msr_wait);
1914 /* rx timeout interrupt. Must be some data available. Put this
1915 * before the check for rx_high since servicing this condition
1916 * may cause that condition to clear.
1918 if (sio_ir & hooks->intr_rx_timer) {
1919 /* ACK the interrupt */
1920 writel(hooks->intr_rx_timer,
1921 &port->ip_mem->sio_ir.raw);
1923 if ((port->ip_notify & N_DATA_READY)
1924 && (port->ip_port)) {
1925 /* ip_lock is set on call here */
1926 receive_chars(port->ip_port);
1930 /* rx high interrupt. Must be after rx_timer. */
1931 else if (sio_ir & hooks->intr_rx_high) {
1932 /* Data available, notify upper layer */
1933 if ((port->ip_notify & N_DATA_READY)
1935 /* ip_lock is set on call here */
1936 receive_chars(port->ip_port);
1939 /* We can't ACK this interrupt. If receive_chars didn't
1940 * cause the condition to clear, we'll have to disable
1941 * the interrupt until the data is drained.
1942 * If the read was aborted, don't disable the interrupt
1943 * as this may cause us to hang indefinitely. An
1944 * aborted read generally means that this interrupt
1945 * hasn't been delivered to the cpu yet anyway, even
1946 * though we see it as asserted when we read the sio_ir.
1948 if ((sio_ir = PENDING(port)) & hooks->intr_rx_high) {
1949 if ((port->ip_flags & READ_ABORTED) == 0) {
1950 port->ip_ienb &= ~hooks->intr_rx_high;
1951 port->ip_flags |= INPUT_HIGH;
1953 rx_high_rd_aborted++;
1958 /* We got a low water interrupt: notify upper layer to
1959 * send more data. Must come before tx_mt since servicing
1960 * this condition may cause that condition to clear.
1962 if (sio_ir & hooks->intr_tx_explicit) {
1963 port->ip_flags &= ~LOWAT_WRITTEN;
1965 /* ACK the interrupt */
1966 writel(hooks->intr_tx_explicit,
1967 &port->ip_mem->sio_ir.raw);
1969 if (port->ip_notify & N_OUTPUT_LOWAT)
1970 ioc4_cb_output_lowat(port->ip_port);
1973 /* Handle tx_mt. Must come after tx_explicit. */
1974 else if (sio_ir & hooks->intr_tx_mt) {
1975 /* If we are expecting a lowat notification
1976 * and we get to this point it probably means that for
1977 * some reason the tx_explicit didn't work as expected
1978 * (that can legitimately happen if the output buffer is
1979 * filled up in just the right way).
1980 * So send the notification now.
1982 if (port->ip_notify & N_OUTPUT_LOWAT) {
1983 ioc4_cb_output_lowat(port->ip_port);
1985 /* We need to reload the sio_ir since the lowat
1986 * call may have caused another write to occur,
1987 * clearing the tx_mt condition.
1989 sio_ir = PENDING(port);
1992 /* If the tx_mt condition still persists even after the
1993 * lowat call, we've got some work to do.
1995 if (sio_ir & hooks->intr_tx_mt) {
1997 /* If we are not currently expecting DMA input,
1998 * and the transmitter has just gone idle,
1999 * there is no longer any reason for DMA, so
2002 if (!(port->ip_notify
2003 & (N_DATA_READY | N_DDCD))) {
2004 BUG_ON(!(port->ip_sscr
2005 & IOC4_SSCR_DMA_EN));
2006 port->ip_sscr &= ~IOC4_SSCR_DMA_EN;
2007 writel(port->ip_sscr,
2008 &port->ip_serial_regs->sscr);
2011 /* Prevent infinite tx_mt interrupt */
2012 port->ip_ienb &= ~hooks->intr_tx_mt;
2015 sio_ir = PENDING(port);
2017 /* if the read was aborted and only hooks->intr_rx_high,
2018 * clear hooks->intr_rx_high, so we do not loop forever.
2021 if (rx_high_rd_aborted && (sio_ir == hooks->intr_rx_high)) {
2022 sio_ir &= ~hooks->intr_rx_high;
2024 } while (sio_ir & hooks->intr_all);
2026 spin_unlock_irqrestore(&port->ip_lock, flags);
2028 /* Re-enable interrupts before returning from interrupt handler.
2029 * Getting interrupted here is okay. It'll just v() our semaphore, and
2030 * we'll come through the loop again.
2033 write_ireg(port->ip_ioc4_soft, port->ip_ienb, IOC4_W_IES,
2034 IOC4_SIO_INTR_TYPE);
2038 * ioc4_cb_post_ncs - called for some basic errors
2039 * @port: port to use
2042 static void ioc4_cb_post_ncs(struct uart_port *the_port, int ncs)
2044 struct uart_icount *icount;
2046 icount = &the_port->icount;
2048 if (ncs & NCS_BREAK)
2050 if (ncs & NCS_FRAMING)
2052 if (ncs & NCS_OVERRUN)
2054 if (ncs & NCS_PARITY)
2059 * do_read - Read in bytes from the port. Return the number of bytes
2061 * @the_port: port to use
2062 * @buf: place to put the stuff we read
2063 * @len: how big 'buf' is
2066 static inline int do_read(struct uart_port *the_port, unsigned char *buf,
2069 int prod_ptr, cons_ptr, total;
2070 struct ioc4_port *port = get_ioc4_port(the_port, 0);
2071 struct ring *inring;
2072 struct ring_entry *entry;
2073 struct hooks *hooks;
2078 BUG_ON(!(len >= 0));
2080 hooks = port->ip_hooks;
2082 /* There is a nasty timing issue in the IOC4. When the rx_timer
2083 * expires or the rx_high condition arises, we take an interrupt.
2084 * At some point while servicing the interrupt, we read bytes from
2085 * the ring buffer and re-arm the rx_timer. However the rx_timer is
2086 * not started until the first byte is received *after* it is armed,
2087 * and any bytes pending in the rx construction buffers are not drained
2088 * to memory until either there are 4 bytes available or the rx_timer
2089 * expires. This leads to a potential situation where data is left
2090 * in the construction buffers forever - 1 to 3 bytes were received
2091 * after the interrupt was generated but before the rx_timer was
2092 * re-armed. At that point as long as no subsequent bytes are received
2093 * the timer will never be started and the bytes will remain in the
2094 * construction buffer forever. The solution is to execute a DRAIN
2095 * command after rearming the timer. This way any bytes received before
2096 * the DRAIN will be drained to memory, and any bytes received after
2097 * the DRAIN will start the TIMER and be drained when it expires.
2098 * Luckily, this only needs to be done when the DMA buffer is empty
2099 * since there is no requirement that this function return all
2100 * available data as long as it returns some.
2102 /* Re-arm the timer */
2103 writel(port->ip_rx_cons | IOC4_SRCIR_ARM, &port->ip_serial_regs->srcir);
2105 prod_ptr = readl(&port->ip_serial_regs->srpir) & PROD_CONS_MASK;
2106 cons_ptr = port->ip_rx_cons;
2108 if (prod_ptr == cons_ptr) {
2111 /* Input buffer appears empty, do a flush. */
2113 /* DMA must be enabled for this to work. */
2114 if (!(port->ip_sscr & IOC4_SSCR_DMA_EN)) {
2115 port->ip_sscr |= IOC4_SSCR_DMA_EN;
2119 /* Potential race condition: we must reload the srpir after
2120 * issuing the drain command, otherwise we could think the rx
2121 * buffer is empty, then take a very long interrupt, and when
2122 * we come back it's full and we wait forever for the drain to
2125 writel(port->ip_sscr | IOC4_SSCR_RX_DRAIN,
2126 &port->ip_serial_regs->sscr);
2127 prod_ptr = readl(&port->ip_serial_regs->srpir)
2130 /* We must not wait for the DRAIN to complete unless there are
2131 * at least 8 bytes (2 ring entries) available to receive the
2132 * data otherwise the DRAIN will never complete and we'll
2134 * In fact, to make things easier, I'll just ignore the flush if
2135 * there is any data at all now available.
2137 if (prod_ptr == cons_ptr) {
2139 while (readl(&port->ip_serial_regs->sscr) &
2140 IOC4_SSCR_RX_DRAIN) {
2142 if (loop_counter > MAXITER)
2146 /* SIGH. We have to reload the prod_ptr *again* since
2147 * the drain may have caused it to change
2149 prod_ptr = readl(&port->ip_serial_regs->srpir)
2153 port->ip_sscr &= ~IOC4_SSCR_DMA_EN;
2154 writel(port->ip_sscr, &port->ip_serial_regs->sscr);
2157 inring = port->ip_inring;
2158 port->ip_flags &= ~READ_ABORTED;
2161 loop_counter = 0xfffff; /* to avoid hangs */
2163 /* Grab bytes from the hardware */
2164 while ((prod_ptr != cons_ptr) && (len > 0)) {
2165 entry = (struct ring_entry *)((caddr_t)inring + cons_ptr);
2167 if ( loop_counter-- <= 0 ) {
2168 printk(KERN_WARNING "IOC4 serial: "
2169 "possible hang condition/"
2170 "port stuck on read.\n");
2174 /* According to the producer pointer, this ring entry
2175 * must contain some data. But if the PIO happened faster
2176 * than the DMA, the data may not be available yet, so let's
2177 * wait until it arrives.
2179 if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
2180 /* Indicate the read is aborted so we don't disable
2181 * the interrupt thinking that the consumer is
2184 port->ip_flags |= READ_ABORTED;
2189 /* Load the bytes/status out of the ring entry */
2190 for (byte_num = 0; byte_num < 4 && len > 0; byte_num++) {
2191 sc = &(entry->ring_sc[byte_num]);
2193 /* Check for change in modem state or overrun */
2194 if ((*sc & IOC4_RXSB_MODEM_VALID)
2195 && (port->ip_notify & N_DDCD)) {
2196 /* Notify upper layer if DCD dropped */
2198 if ((port->ip_flags & DCD_ON)
2199 && !(*sc & IOC4_RXSB_DCD)) {
2201 /* If we have already copied some data,
2202 * return it. We'll pick up the carrier
2203 * drop on the next pass. That way we
2204 * don't throw away the data that has
2205 * already been copied back to
2206 * the caller's buffer.
2212 port->ip_flags &= ~DCD_ON;
2214 /* Turn off this notification so the
2215 * carrier drop protocol won't see it
2216 * again when it does a read.
2218 *sc &= ~IOC4_RXSB_MODEM_VALID;
2220 /* To keep things consistent, we need
2221 * to update the consumer pointer so
2222 * the next reader won't come in and
2223 * try to read the same ring entries
2224 * again. This must be done here before
2228 if ((entry->ring_allsc & RING_ANY_VALID)
2230 cons_ptr += (int)sizeof
2231 (struct ring_entry);
2232 cons_ptr &= PROD_CONS_MASK;
2235 &port->ip_serial_regs->srcir);
2236 port->ip_rx_cons = cons_ptr;
2238 /* Notify upper layer of carrier drop */
2239 if ((port->ip_notify & N_DDCD)
2241 the_port->icount.dcd = 0;
2242 wake_up_interruptible
2244 port.delta_msr_wait);
2247 /* If we had any data to return, we
2248 * would have returned it above.
2253 if (*sc & IOC4_RXSB_MODEM_VALID) {
2254 /* Notify that an input overrun occurred */
2255 if ((*sc & IOC4_RXSB_OVERRUN)
2256 && (port->ip_notify & N_OVERRUN_ERROR)) {
2257 ioc4_cb_post_ncs(the_port, NCS_OVERRUN);
2259 /* Don't look at this byte again */
2260 *sc &= ~IOC4_RXSB_MODEM_VALID;
2263 /* Check for valid data or RX errors */
2264 if ((*sc & IOC4_RXSB_DATA_VALID) &&
2265 ((*sc & (IOC4_RXSB_PAR_ERR
2266 | IOC4_RXSB_FRAME_ERR
2268 && (port->ip_notify & (N_PARITY_ERROR
2271 /* There is an error condition on the next byte.
2272 * If we have already transferred some bytes,
2273 * we'll stop here. Otherwise if this is the
2274 * first byte to be read, we'll just transfer
2275 * it alone after notifying the
2276 * upper layer of its status.
2282 if ((*sc & IOC4_RXSB_PAR_ERR) &&
2283 (port->ip_notify & N_PARITY_ERROR)) {
2284 ioc4_cb_post_ncs(the_port,
2287 if ((*sc & IOC4_RXSB_FRAME_ERR) &&
2288 (port->ip_notify & N_FRAMING_ERROR)){
2289 ioc4_cb_post_ncs(the_port,
2292 if ((*sc & IOC4_RXSB_BREAK)
2293 && (port->ip_notify & N_BREAK)) {
2301 if (*sc & IOC4_RXSB_DATA_VALID) {
2302 *sc &= ~IOC4_RXSB_DATA_VALID;
2303 *buf = entry->ring_data[byte_num];
2310 /* If we used up this entry entirely, go on to the next one,
2311 * otherwise we must have run out of buffer space, so
2312 * leave the consumer pointer here for the next read in case
2313 * there are still unread bytes in this entry.
2315 if ((entry->ring_allsc & RING_ANY_VALID) == 0) {
2316 cons_ptr += (int)sizeof(struct ring_entry);
2317 cons_ptr &= PROD_CONS_MASK;
2321 /* Update consumer pointer and re-arm rx timer interrupt */
2322 writel(cons_ptr, &port->ip_serial_regs->srcir);
2323 port->ip_rx_cons = cons_ptr;
2325 /* If we have now dipped below the rx high water mark and we have
2326 * rx_high interrupt turned off, we can now turn it back on again.
2328 if ((port->ip_flags & INPUT_HIGH) && (((prod_ptr - cons_ptr)
2329 & PROD_CONS_MASK) < ((port->ip_sscr &
2330 IOC4_SSCR_RX_THRESHOLD)
2331 << IOC4_PROD_CONS_PTR_OFF))) {
2332 port->ip_flags &= ~INPUT_HIGH;
2333 enable_intrs(port, hooks->intr_rx_high);
2339 * receive_chars - upper level read. Called with ip_lock.
2340 * @the_port: port to read from
2342 static void receive_chars(struct uart_port *the_port)
2344 unsigned char ch[IOC4_MAX_CHARS];
2345 int read_count, request_count = IOC4_MAX_CHARS;
2346 struct uart_icount *icount;
2347 struct uart_state *state = the_port->state;
2348 unsigned long pflags;
2350 /* Make sure all the pointers are "good" ones */
2354 spin_lock_irqsave(&the_port->lock, pflags);
2356 request_count = tty_buffer_request_room(&state->port, IOC4_MAX_CHARS);
2358 if (request_count > 0) {
2359 icount = &the_port->icount;
2360 read_count = do_read(the_port, ch, request_count);
2361 if (read_count > 0) {
2362 tty_insert_flip_string(&state->port, ch, read_count);
2363 icount->rx += read_count;
2367 spin_unlock_irqrestore(&the_port->lock, pflags);
2369 tty_flip_buffer_push(&state->port);
2373 * ic4_type - What type of console are we?
2374 * @port: Port to operate with (we ignore since we only have one port)
2377 static const char *ic4_type(struct uart_port *the_port)
2379 if (the_port->mapbase == PROTO_RS232)
2380 return "SGI IOC4 Serial [rs232]";
2382 return "SGI IOC4 Serial [rs422]";
2386 * ic4_tx_empty - Is the transmitter empty?
2387 * @port: Port to operate on
2390 static unsigned int ic4_tx_empty(struct uart_port *the_port)
2392 struct ioc4_port *port = get_ioc4_port(the_port, 0);
2393 unsigned int ret = 0;
2395 if (port_is_active(port, the_port)) {
2396 if (readl(&port->ip_serial_regs->shadow) & IOC4_SHADOW_TEMT)
2403 * ic4_stop_tx - stop the transmitter
2404 * @port: Port to operate on
2407 static void ic4_stop_tx(struct uart_port *the_port)
2409 struct ioc4_port *port = get_ioc4_port(the_port, 0);
2411 if (port_is_active(port, the_port))
2412 set_notification(port, N_OUTPUT_LOWAT, 0);
2416 * null_void_function -
2417 * @port: Port to operate on
2420 static void null_void_function(struct uart_port *the_port)
2425 * ic4_shutdown - shut down the port - free irq and disable
2426 * @port: Port to shut down
2429 static void ic4_shutdown(struct uart_port *the_port)
2431 unsigned long port_flags;
2432 struct ioc4_port *port;
2433 struct uart_state *state;
2435 port = get_ioc4_port(the_port, 0);
2439 state = the_port->state;
2440 port->ip_port = NULL;
2442 wake_up_interruptible(&state->port.delta_msr_wait);
2444 if (state->port.tty)
2445 set_bit(TTY_IO_ERROR, &state->port.tty->flags);
2447 spin_lock_irqsave(&the_port->lock, port_flags);
2448 set_notification(port, N_ALL, 0);
2449 port->ip_flags = PORT_INACTIVE;
2450 spin_unlock_irqrestore(&the_port->lock, port_flags);
2454 * ic4_set_mctrl - set control lines (dtr, rts, etc)
2455 * @port: Port to operate on
2456 * @mctrl: Lines to set/unset
2459 static void ic4_set_mctrl(struct uart_port *the_port, unsigned int mctrl)
2461 unsigned char mcr = 0;
2462 struct ioc4_port *port;
2464 port = get_ioc4_port(the_port, 0);
2465 if (!port_is_active(port, the_port))
2468 if (mctrl & TIOCM_RTS)
2469 mcr |= UART_MCR_RTS;
2470 if (mctrl & TIOCM_DTR)
2471 mcr |= UART_MCR_DTR;
2472 if (mctrl & TIOCM_OUT1)
2473 mcr |= UART_MCR_OUT1;
2474 if (mctrl & TIOCM_OUT2)
2475 mcr |= UART_MCR_OUT2;
2476 if (mctrl & TIOCM_LOOP)
2477 mcr |= UART_MCR_LOOP;
2479 set_mcr(the_port, mcr, IOC4_SHADOW_DTR);
2483 * ic4_get_mctrl - get control line info
2484 * @port: port to operate on
2487 static unsigned int ic4_get_mctrl(struct uart_port *the_port)
2489 struct ioc4_port *port = get_ioc4_port(the_port, 0);
2491 unsigned int ret = 0;
2493 if (!port_is_active(port, the_port))
2496 shadow = readl(&port->ip_serial_regs->shadow);
2497 if (shadow & IOC4_SHADOW_DCD)
2499 if (shadow & IOC4_SHADOW_DR)
2501 if (shadow & IOC4_SHADOW_CTS)
2507 * ic4_start_tx - Start transmitter, flush any output
2508 * @port: Port to operate on
2511 static void ic4_start_tx(struct uart_port *the_port)
2513 struct ioc4_port *port = get_ioc4_port(the_port, 0);
2515 if (port_is_active(port, the_port)) {
2516 set_notification(port, N_OUTPUT_LOWAT, 1);
2517 enable_intrs(port, port->ip_hooks->intr_tx_mt);
2522 * ic4_break_ctl - handle breaks
2523 * @port: Port to operate on
2524 * @break_state: Break state
2527 static void ic4_break_ctl(struct uart_port *the_port, int break_state)
2532 * ic4_startup - Start up the serial port
2533 * @port: Port to operate on
2536 static int ic4_startup(struct uart_port *the_port)
2539 struct ioc4_port *port;
2540 struct ioc4_control *control;
2541 struct uart_state *state;
2542 unsigned long port_flags;
2546 port = get_ioc4_port(the_port, 1);
2549 state = the_port->state;
2551 control = port->ip_control;
2553 port->ip_port = NULL;
2557 /* Start up the serial port */
2558 spin_lock_irqsave(&the_port->lock, port_flags);
2559 retval = ic4_startup_local(the_port);
2560 spin_unlock_irqrestore(&the_port->lock, port_flags);
2565 * ic4_set_termios - set termios stuff
2566 * @port: port to operate on
2567 * @termios: New settings
2572 ic4_set_termios(struct uart_port *the_port,
2573 struct ktermios *termios, struct ktermios *old_termios)
2575 unsigned long port_flags;
2577 spin_lock_irqsave(&the_port->lock, port_flags);
2578 ioc4_change_speed(the_port, termios, old_termios);
2579 spin_unlock_irqrestore(&the_port->lock, port_flags);
2583 * ic4_request_port - allocate resources for port - no op....
2584 * @port: port to operate on
2587 static int ic4_request_port(struct uart_port *port)
2592 /* Associate the uart functions above - given to serial core */
2594 static struct uart_ops ioc4_ops = {
2595 .tx_empty = ic4_tx_empty,
2596 .set_mctrl = ic4_set_mctrl,
2597 .get_mctrl = ic4_get_mctrl,
2598 .stop_tx = ic4_stop_tx,
2599 .start_tx = ic4_start_tx,
2600 .stop_rx = null_void_function,
2601 .break_ctl = ic4_break_ctl,
2602 .startup = ic4_startup,
2603 .shutdown = ic4_shutdown,
2604 .set_termios = ic4_set_termios,
2606 .release_port = null_void_function,
2607 .request_port = ic4_request_port,
2611 * Boot-time initialization code
2614 static struct uart_driver ioc4_uart_rs232 = {
2615 .owner = THIS_MODULE,
2616 .driver_name = "ioc4_serial_rs232",
2617 .dev_name = DEVICE_NAME_RS232,
2618 .major = DEVICE_MAJOR,
2619 .minor = DEVICE_MINOR_RS232,
2620 .nr = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS,
2623 static struct uart_driver ioc4_uart_rs422 = {
2624 .owner = THIS_MODULE,
2625 .driver_name = "ioc4_serial_rs422",
2626 .dev_name = DEVICE_NAME_RS422,
2627 .major = DEVICE_MAJOR,
2628 .minor = DEVICE_MINOR_RS422,
2629 .nr = IOC4_NUM_CARDS * IOC4_NUM_SERIAL_PORTS,
2634 * ioc4_serial_remove_one - detach function
2636 * @idd: IOC4 master module data for this IOC4
2639 static int ioc4_serial_remove_one(struct ioc4_driver_data *idd)
2641 int port_num, port_type;
2642 struct ioc4_control *control;
2643 struct uart_port *the_port;
2644 struct ioc4_port *port;
2645 struct ioc4_soft *soft;
2647 /* If serial driver did not attach, don't try to detach */
2648 control = idd->idd_serial_data;
2652 for (port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS; port_num++) {
2653 for (port_type = UART_PORT_MIN;
2654 port_type < UART_PORT_COUNT;
2656 the_port = &control->ic_port[port_num].icp_uart_port
2659 switch (port_type) {
2660 case UART_PORT_RS422:
2661 uart_remove_one_port(&ioc4_uart_rs422,
2665 case UART_PORT_RS232:
2666 uart_remove_one_port(&ioc4_uart_rs232,
2672 port = control->ic_port[port_num].icp_port;
2673 /* we allocate in pairs */
2674 if (!(port_num & 1) && port) {
2675 pci_free_consistent(port->ip_pdev,
2676 TOTAL_RING_BUF_SIZE,
2677 port->ip_cpu_ringbuf,
2678 port->ip_dma_ringbuf);
2682 soft = control->ic_soft;
2684 free_irq(control->ic_irq, soft);
2685 if (soft->is_ioc4_serial_addr) {
2686 iounmap(soft->is_ioc4_serial_addr);
2687 release_mem_region((unsigned long)
2688 soft->is_ioc4_serial_addr,
2689 sizeof(struct ioc4_serial));
2694 idd->idd_serial_data = NULL;
2701 * ioc4_serial_core_attach_rs232 - register with serial core
2702 * This is done during pci probing
2703 * @pdev: handle for this card
2706 ioc4_serial_core_attach(struct pci_dev *pdev, int port_type)
2708 struct ioc4_port *port;
2709 struct uart_port *the_port;
2710 struct ioc4_driver_data *idd = pci_get_drvdata(pdev);
2711 struct ioc4_control *control = idd->idd_serial_data;
2714 struct uart_driver *u_driver;
2717 DPRINT_CONFIG(("%s: attach pdev 0x%p - control 0x%p\n",
2718 __func__, pdev, (void *)control));
2723 port_type_idx = (port_type == PROTO_RS232) ? UART_PORT_RS232
2726 u_driver = (port_type == PROTO_RS232) ? &ioc4_uart_rs232
2729 /* once around for each port on this card */
2730 for (port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS; port_num++) {
2731 the_port = &control->ic_port[port_num].icp_uart_port
2733 port = control->ic_port[port_num].icp_port;
2734 port->ip_all_ports[port_type_idx] = the_port;
2736 DPRINT_CONFIG(("%s: attach the_port 0x%p / port 0x%p : type %s\n",
2737 __func__, (void *)the_port,
2739 port_type == PROTO_RS232 ? "rs232" : "rs422"));
2741 /* membase, iobase and mapbase just need to be non-0 */
2742 the_port->membase = (unsigned char __iomem *)1;
2743 the_port->iobase = (pdev->bus->number << 16) | port_num;
2744 the_port->line = (Num_of_ioc4_cards << 2) | port_num;
2745 the_port->mapbase = port_type;
2746 the_port->type = PORT_16550A;
2747 the_port->fifosize = IOC4_FIFO_CHARS;
2748 the_port->ops = &ioc4_ops;
2749 the_port->irq = control->ic_irq;
2750 the_port->dev = &pdev->dev;
2751 spin_lock_init(&the_port->lock);
2752 if (uart_add_one_port(u_driver, the_port) < 0) {
2754 "%s: unable to add port %d bus %d\n",
2755 __func__, the_port->line, pdev->bus->number);
2758 ("IOC4 serial port %d irq = %d, bus %d\n",
2759 the_port->line, the_port->irq, pdev->bus->number));
2766 * ioc4_serial_attach_one - register attach function
2767 * called per card found from IOC4 master module.
2768 * @idd: Master module data for this IOC4
2771 ioc4_serial_attach_one(struct ioc4_driver_data *idd)
2773 unsigned long tmp_addr1;
2774 struct ioc4_serial __iomem *serial;
2775 struct ioc4_soft *soft;
2776 struct ioc4_control *control;
2780 DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __func__, idd->idd_pdev,
2783 /* PCI-RT does not bring out serial connections.
2784 * Do not attach to this particular IOC4.
2786 if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
2789 /* request serial registers */
2790 tmp_addr1 = idd->idd_bar0 + IOC4_SERIAL_OFFSET;
2792 if (!request_mem_region(tmp_addr1, sizeof(struct ioc4_serial),
2795 "ioc4 (%p): unable to get request region for "
2796 "uart space\n", (void *)idd->idd_pdev);
2800 serial = ioremap(tmp_addr1, sizeof(struct ioc4_serial));
2803 "ioc4 (%p) : unable to remap ioc4 serial register\n",
2804 (void *)idd->idd_pdev);
2808 DPRINT_CONFIG(("%s : mem 0x%p, serial 0x%p\n",
2809 __func__, (void *)idd->idd_misc_regs,
2812 /* Get memory for the new card */
2813 control = kzalloc(sizeof(struct ioc4_control), GFP_KERNEL);
2816 printk(KERN_WARNING "ioc4_attach_one"
2817 ": unable to get memory for the IOC4\n");
2821 idd->idd_serial_data = control;
2823 /* Allocate the soft structure */
2824 soft = kzalloc(sizeof(struct ioc4_soft), GFP_KERNEL);
2827 "ioc4 (%p): unable to get memory for the soft struct\n",
2828 (void *)idd->idd_pdev);
2833 spin_lock_init(&soft->is_ir_lock);
2834 soft->is_ioc4_misc_addr = idd->idd_misc_regs;
2835 soft->is_ioc4_serial_addr = serial;
2838 writel(0xf << IOC4_SIO_CR_CMD_PULSE_SHIFT,
2839 &idd->idd_misc_regs->sio_cr.raw);
2841 /* Enable serial port mode select generic PIO pins as outputs */
2842 writel(IOC4_GPCR_UART0_MODESEL | IOC4_GPCR_UART1_MODESEL
2843 | IOC4_GPCR_UART2_MODESEL | IOC4_GPCR_UART3_MODESEL,
2844 &idd->idd_misc_regs->gpcr_s.raw);
2846 /* Clear and disable all serial interrupts */
2847 write_ireg(soft, ~0, IOC4_W_IEC, IOC4_SIO_INTR_TYPE);
2848 writel(~0, &idd->idd_misc_regs->sio_ir.raw);
2849 write_ireg(soft, IOC4_OTHER_IR_SER_MEMERR, IOC4_W_IEC,
2850 IOC4_OTHER_INTR_TYPE);
2851 writel(IOC4_OTHER_IR_SER_MEMERR, &idd->idd_misc_regs->other_ir.raw);
2852 control->ic_soft = soft;
2854 /* Hook up interrupt handler */
2855 if (!request_irq(idd->idd_pdev->irq, ioc4_intr, IRQF_SHARED,
2856 "sgi-ioc4serial", soft)) {
2857 control->ic_irq = idd->idd_pdev->irq;
2860 "%s : request_irq fails for IRQ 0x%x\n ",
2861 __func__, idd->idd_pdev->irq);
2863 ret = ioc4_attach_local(idd);
2867 /* register port with the serial core - 1 rs232, 1 rs422 */
2869 ret = ioc4_serial_core_attach(idd->idd_pdev, PROTO_RS232);
2873 ret = ioc4_serial_core_attach(idd->idd_pdev, PROTO_RS422);
2877 Num_of_ioc4_cards++;
2881 /* error exits that give back resources */
2883 ioc4_serial_remove_one(idd);
2892 release_mem_region(tmp_addr1, sizeof(struct ioc4_serial));
2899 static struct ioc4_submodule ioc4_serial_submodule = {
2900 .is_name = "IOC4_serial",
2901 .is_owner = THIS_MODULE,
2902 .is_probe = ioc4_serial_attach_one,
2903 .is_remove = ioc4_serial_remove_one,
2907 * ioc4_serial_init - module init
2909 static int __init ioc4_serial_init(void)
2913 /* register with serial core */
2914 if ((ret = uart_register_driver(&ioc4_uart_rs232)) < 0) {
2916 "%s: Couldn't register rs232 IOC4 serial driver\n",
2920 if ((ret = uart_register_driver(&ioc4_uart_rs422)) < 0) {
2922 "%s: Couldn't register rs422 IOC4 serial driver\n",
2924 goto out_uart_rs232;
2927 /* register with IOC4 main module */
2928 ret = ioc4_register_submodule(&ioc4_serial_submodule);
2930 goto out_uart_rs422;
2934 uart_unregister_driver(&ioc4_uart_rs422);
2936 uart_unregister_driver(&ioc4_uart_rs232);
2941 static void __exit ioc4_serial_exit(void)
2943 ioc4_unregister_submodule(&ioc4_serial_submodule);
2944 uart_unregister_driver(&ioc4_uart_rs232);
2945 uart_unregister_driver(&ioc4_uart_rs422);
2948 late_initcall(ioc4_serial_init); /* Call only after tty init is done */
2949 module_exit(ioc4_serial_exit);
2951 MODULE_AUTHOR("Pat Gefre - Silicon Graphics Inc. (SGI) <pfg@sgi.com>");
2952 MODULE_DESCRIPTION("Serial PCI driver module for SGI IOC4 Base-IO Card");
2953 MODULE_LICENSE("GPL");