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fix a kmap leak in virtio_console
[linux/fpc-iii.git] / drivers / tty / serial / rp2.c
blob056f91b3a4ca564d4a04d47183979014922f2cc3
1 /*
2 * Driver for Comtrol RocketPort EXPRESS/INFINITY cards
3 *
4 * Copyright (C) 2012 Kevin Cernekee <cernekee@gmail.com>
5 *
6 * Inspired by, and loosely based on:
7 *
8 * ar933x_uart.c
9 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
10 *
11 * rocketport_infinity_express-linux-1.20.tar.gz
12 * Copyright (C) 2004-2011 Comtrol, Inc.
13 *
14 * This program is free software; you can redistribute it and/or modify it
15 * under the terms of the GNU General Public License version 2 as published
16 * by the Free Software Foundation.
17 */
18
19 #include <linux/bitops.h>
20 #include <linux/compiler.h>
21 #include <linux/completion.h>
22 #include <linux/console.h>
23 #include <linux/delay.h>
24 #include <linux/firmware.h>
25 #include <linux/init.h>
26 #include <linux/io.h>
27 #include <linux/ioport.h>
28 #include <linux/irq.h>
29 #include <linux/kernel.h>
30 #include <linux/log2.h>
31 #include <linux/module.h>
32 #include <linux/pci.h>
33 #include <linux/serial.h>
34 #include <linux/serial_core.h>
35 #include <linux/slab.h>
36 #include <linux/sysrq.h>
37 #include <linux/tty.h>
38 #include <linux/tty_flip.h>
39 #include <linux/types.h>
40
41 #define DRV_NAME "rp2"
42
43 #define RP2_FW_NAME "rp2.fw"
44 #define RP2_UCODE_BYTES 0x3f
45
46 #define PORTS_PER_ASIC 16
47 #define ALL_PORTS_MASK (BIT(PORTS_PER_ASIC) - 1)
48
49 #define UART_CLOCK 44236800
50 #define DEFAULT_BAUD_DIV (UART_CLOCK / (9600 * 16))
51 #define FIFO_SIZE 512
52
53 /* BAR0 registers */
54 #define RP2_FPGA_CTL0 0x110
55 #define RP2_FPGA_CTL1 0x11c
56 #define RP2_IRQ_MASK 0x1ec
57 #define RP2_IRQ_MASK_EN_m BIT(0)
58 #define RP2_IRQ_STATUS 0x1f0
59
60 /* BAR1 registers */
61 #define RP2_ASIC_SPACING 0x1000
62 #define RP2_ASIC_OFFSET(i) ((i) << ilog2(RP2_ASIC_SPACING))
63
64 #define RP2_PORT_BASE 0x000
65 #define RP2_PORT_SPACING 0x040
66
67 #define RP2_UCODE_BASE 0x400
68 #define RP2_UCODE_SPACING 0x80
69
70 #define RP2_CLK_PRESCALER 0xc00
71 #define RP2_CH_IRQ_STAT 0xc04
72 #define RP2_CH_IRQ_MASK 0xc08
73 #define RP2_ASIC_IRQ 0xd00
74 #define RP2_ASIC_IRQ_EN_m BIT(20)
75 #define RP2_GLOBAL_CMD 0xd0c
76 #define RP2_ASIC_CFG 0xd04
77
78 /* port registers */
79 #define RP2_DATA_DWORD 0x000
80
81 #define RP2_DATA_BYTE 0x008
82 #define RP2_DATA_BYTE_ERR_PARITY_m BIT(8)
83 #define RP2_DATA_BYTE_ERR_OVERRUN_m BIT(9)
84 #define RP2_DATA_BYTE_ERR_FRAMING_m BIT(10)
85 #define RP2_DATA_BYTE_BREAK_m BIT(11)
86
87 /* This lets uart_insert_char() drop bytes received on a !CREAD port */
88 #define RP2_DUMMY_READ BIT(16)
89
90 #define RP2_DATA_BYTE_EXCEPTION_MASK (RP2_DATA_BYTE_ERR_PARITY_m | \
91 RP2_DATA_BYTE_ERR_OVERRUN_m | \
92 RP2_DATA_BYTE_ERR_FRAMING_m | \
93 RP2_DATA_BYTE_BREAK_m)
94
95 #define RP2_RX_FIFO_COUNT 0x00c
96 #define RP2_TX_FIFO_COUNT 0x00e
97
98 #define RP2_CHAN_STAT 0x010
99 #define RP2_CHAN_STAT_RXDATA_m BIT(0)
100 #define RP2_CHAN_STAT_DCD_m BIT(3)
101 #define RP2_CHAN_STAT_DSR_m BIT(4)
102 #define RP2_CHAN_STAT_CTS_m BIT(5)
103 #define RP2_CHAN_STAT_RI_m BIT(6)
104 #define RP2_CHAN_STAT_OVERRUN_m BIT(13)
105 #define RP2_CHAN_STAT_DSR_CHANGED_m BIT(16)
106 #define RP2_CHAN_STAT_CTS_CHANGED_m BIT(17)
107 #define RP2_CHAN_STAT_CD_CHANGED_m BIT(18)
108 #define RP2_CHAN_STAT_RI_CHANGED_m BIT(22)
109 #define RP2_CHAN_STAT_TXEMPTY_m BIT(25)
110
111 #define RP2_CHAN_STAT_MS_CHANGED_MASK (RP2_CHAN_STAT_DSR_CHANGED_m | \
112 RP2_CHAN_STAT_CTS_CHANGED_m | \
113 RP2_CHAN_STAT_CD_CHANGED_m | \
114 RP2_CHAN_STAT_RI_CHANGED_m)
115
116 #define RP2_TXRX_CTL 0x014
117 #define RP2_TXRX_CTL_MSRIRQ_m BIT(0)
118 #define RP2_TXRX_CTL_RXIRQ_m BIT(2)
119 #define RP2_TXRX_CTL_RX_TRIG_s 3
120 #define RP2_TXRX_CTL_RX_TRIG_m (0x3 << RP2_TXRX_CTL_RX_TRIG_s)
121 #define RP2_TXRX_CTL_RX_TRIG_1 (0x1 << RP2_TXRX_CTL_RX_TRIG_s)
122 #define RP2_TXRX_CTL_RX_TRIG_256 (0x2 << RP2_TXRX_CTL_RX_TRIG_s)
123 #define RP2_TXRX_CTL_RX_TRIG_448 (0x3 << RP2_TXRX_CTL_RX_TRIG_s)
124 #define RP2_TXRX_CTL_RX_EN_m BIT(5)
125 #define RP2_TXRX_CTL_RTSFLOW_m BIT(6)
126 #define RP2_TXRX_CTL_DTRFLOW_m BIT(7)
127 #define RP2_TXRX_CTL_TX_TRIG_s 16
128 #define RP2_TXRX_CTL_TX_TRIG_m (0x3 << RP2_TXRX_CTL_RX_TRIG_s)
129 #define RP2_TXRX_CTL_DSRFLOW_m BIT(18)
130 #define RP2_TXRX_CTL_TXIRQ_m BIT(19)
131 #define RP2_TXRX_CTL_CTSFLOW_m BIT(23)
132 #define RP2_TXRX_CTL_TX_EN_m BIT(24)
133 #define RP2_TXRX_CTL_RTS_m BIT(25)
134 #define RP2_TXRX_CTL_DTR_m BIT(26)
135 #define RP2_TXRX_CTL_LOOP_m BIT(27)
136 #define RP2_TXRX_CTL_BREAK_m BIT(28)
137 #define RP2_TXRX_CTL_CMSPAR_m BIT(29)
138 #define RP2_TXRX_CTL_nPARODD_m BIT(30)
139 #define RP2_TXRX_CTL_PARENB_m BIT(31)
140
141 #define RP2_UART_CTL 0x018
142 #define RP2_UART_CTL_MODE_s 0
143 #define RP2_UART_CTL_MODE_m (0x7 << RP2_UART_CTL_MODE_s)
144 #define RP2_UART_CTL_MODE_rs232 (0x1 << RP2_UART_CTL_MODE_s)
145 #define RP2_UART_CTL_FLUSH_RX_m BIT(3)
146 #define RP2_UART_CTL_FLUSH_TX_m BIT(4)
147 #define RP2_UART_CTL_RESET_CH_m BIT(5)
148 #define RP2_UART_CTL_XMIT_EN_m BIT(6)
149 #define RP2_UART_CTL_DATABITS_s 8
150 #define RP2_UART_CTL_DATABITS_m (0x3 << RP2_UART_CTL_DATABITS_s)
151 #define RP2_UART_CTL_DATABITS_8 (0x3 << RP2_UART_CTL_DATABITS_s)
152 #define RP2_UART_CTL_DATABITS_7 (0x2 << RP2_UART_CTL_DATABITS_s)
153 #define RP2_UART_CTL_DATABITS_6 (0x1 << RP2_UART_CTL_DATABITS_s)
154 #define RP2_UART_CTL_DATABITS_5 (0x0 << RP2_UART_CTL_DATABITS_s)
155 #define RP2_UART_CTL_STOPBITS_m BIT(10)
156
157 #define RP2_BAUD 0x01c
158
159 /* ucode registers */
160 #define RP2_TX_SWFLOW 0x02
161 #define RP2_TX_SWFLOW_ena 0x81
162 #define RP2_TX_SWFLOW_dis 0x9d
163
164 #define RP2_RX_SWFLOW 0x0c
165 #define RP2_RX_SWFLOW_ena 0x81
166 #define RP2_RX_SWFLOW_dis 0x8d
167
168 #define RP2_RX_FIFO 0x37
169 #define RP2_RX_FIFO_ena 0x08
170 #define RP2_RX_FIFO_dis 0x81
171
172 static struct uart_driver rp2_uart_driver = {
173 .owner = THIS_MODULE,
174 .driver_name = DRV_NAME,
175 .dev_name = "ttyRP",
176 .nr = CONFIG_SERIAL_RP2_NR_UARTS,
177 };
178
179 struct rp2_card;
180
181 struct rp2_uart_port {
182 struct uart_port port;
183 int idx;
184 int ignore_rx;
185 struct rp2_card *card;
186 void __iomem *asic_base;
187 void __iomem *base;
188 void __iomem *ucode;
189 };
190
191 struct rp2_card {
192 struct pci_dev *pdev;
193 struct rp2_uart_port *ports;
194 int n_ports;
195 int initialized_ports;
196 int minor_start;
197 int smpte;
198 void __iomem *bar0;
199 void __iomem *bar1;
200 spinlock_t card_lock;
201 struct completion fw_loaded;
202 };
203
204 #define RP_ID(prod) PCI_VDEVICE(RP, (prod))
205 #define RP_CAP(ports, smpte) (((ports) << 8) | ((smpte) << 0))
206
207 static inline void rp2_decode_cap(const struct pci_device_id *id,
208 int *ports, int *smpte)
209 {
210 *ports = id->driver_data >> 8;
211 *smpte = id->driver_data & 0xff;
212 }
213
214 static DEFINE_SPINLOCK(rp2_minor_lock);
215 static int rp2_minor_next;
216
217 static int rp2_alloc_ports(int n_ports)
218 {
219 int ret = -ENOSPC;
220
221 spin_lock(&rp2_minor_lock);
222 if (rp2_minor_next + n_ports <= CONFIG_SERIAL_RP2_NR_UARTS) {
223 /* sorry, no support for hot unplugging individual cards */
224 ret = rp2_minor_next;
225 rp2_minor_next += n_ports;
226 }
227 spin_unlock(&rp2_minor_lock);
228
229 return ret;
230 }
231
232 static inline struct rp2_uart_port *port_to_up(struct uart_port *port)
233 {
234 return container_of(port, struct rp2_uart_port, port);
235 }
236
237 static void rp2_rmw(struct rp2_uart_port *up, int reg,
238 u32 clr_bits, u32 set_bits)
239 {
240 u32 tmp = readl(up->base + reg);
241 tmp &= ~clr_bits;
242 tmp |= set_bits;
243 writel(tmp, up->base + reg);
244 }
245
246 static void rp2_rmw_clr(struct rp2_uart_port *up, int reg, u32 val)
247 {
248 rp2_rmw(up, reg, val, 0);
249 }
250
251 static void rp2_rmw_set(struct rp2_uart_port *up, int reg, u32 val)
252 {
253 rp2_rmw(up, reg, 0, val);
254 }
255
256 static void rp2_mask_ch_irq(struct rp2_uart_port *up, int ch_num,
257 int is_enabled)
258 {
259 unsigned long flags, irq_mask;
260
261 spin_lock_irqsave(&up->card->card_lock, flags);
262
263 irq_mask = readl(up->asic_base + RP2_CH_IRQ_MASK);
264 if (is_enabled)
265 irq_mask &= ~BIT(ch_num);
266 else
267 irq_mask |= BIT(ch_num);
268 writel(irq_mask, up->asic_base + RP2_CH_IRQ_MASK);
269
270 spin_unlock_irqrestore(&up->card->card_lock, flags);
271 }
272
273 static unsigned int rp2_uart_tx_empty(struct uart_port *port)
274 {
275 struct rp2_uart_port *up = port_to_up(port);
276 unsigned long tx_fifo_bytes, flags;
277
278 /*
279 * This should probably check the transmitter, not the FIFO.
280 * But the TXEMPTY bit doesn't seem to work unless the TX IRQ is
281 * enabled.
282 */
283 spin_lock_irqsave(&up->port.lock, flags);
284 tx_fifo_bytes = readw(up->base + RP2_TX_FIFO_COUNT);
285 spin_unlock_irqrestore(&up->port.lock, flags);
286
287 return tx_fifo_bytes ? 0 : TIOCSER_TEMT;
288 }
289
290 static unsigned int rp2_uart_get_mctrl(struct uart_port *port)
291 {
292 struct rp2_uart_port *up = port_to_up(port);
293 u32 status;
294
295 status = readl(up->base + RP2_CHAN_STAT);
296 return ((status & RP2_CHAN_STAT_DCD_m) ? TIOCM_CAR : 0) |
297 ((status & RP2_CHAN_STAT_DSR_m) ? TIOCM_DSR : 0) |
298 ((status & RP2_CHAN_STAT_CTS_m) ? TIOCM_CTS : 0) |
299 ((status & RP2_CHAN_STAT_RI_m) ? TIOCM_RI : 0);
300 }
301
302 static void rp2_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
303 {
304 rp2_rmw(port_to_up(port), RP2_TXRX_CTL,
305 RP2_TXRX_CTL_DTR_m | RP2_TXRX_CTL_RTS_m | RP2_TXRX_CTL_LOOP_m,
306 ((mctrl & TIOCM_DTR) ? RP2_TXRX_CTL_DTR_m : 0) |
307 ((mctrl & TIOCM_RTS) ? RP2_TXRX_CTL_RTS_m : 0) |
308 ((mctrl & TIOCM_LOOP) ? RP2_TXRX_CTL_LOOP_m : 0));
309 }
310
311 static void rp2_uart_start_tx(struct uart_port *port)
312 {
313 rp2_rmw_set(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_TXIRQ_m);
314 }
315
316 static void rp2_uart_stop_tx(struct uart_port *port)
317 {
318 rp2_rmw_clr(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_TXIRQ_m);
319 }
320
321 static void rp2_uart_stop_rx(struct uart_port *port)
322 {
323 rp2_rmw_clr(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_RXIRQ_m);
324 }
325
326 static void rp2_uart_break_ctl(struct uart_port *port, int break_state)
327 {
328 unsigned long flags;
329
330 spin_lock_irqsave(&port->lock, flags);
331 rp2_rmw(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_BREAK_m,
332 break_state ? RP2_TXRX_CTL_BREAK_m : 0);
333 spin_unlock_irqrestore(&port->lock, flags);
334 }
335
336 static void rp2_uart_enable_ms(struct uart_port *port)
337 {
338 rp2_rmw_set(port_to_up(port), RP2_TXRX_CTL, RP2_TXRX_CTL_MSRIRQ_m);
339 }
340
341 static void __rp2_uart_set_termios(struct rp2_uart_port *up,
342 unsigned long cfl,
343 unsigned long ifl,
344 unsigned int baud_div)
345 {
346 /* baud rate divisor (calculated elsewhere). 0 = divide-by-1 */
347 writew(baud_div - 1, up->base + RP2_BAUD);
348
349 /* data bits and stop bits */
350 rp2_rmw(up, RP2_UART_CTL,
351 RP2_UART_CTL_STOPBITS_m | RP2_UART_CTL_DATABITS_m,
352 ((cfl & CSTOPB) ? RP2_UART_CTL_STOPBITS_m : 0) |
353 (((cfl & CSIZE) == CS8) ? RP2_UART_CTL_DATABITS_8 : 0) |
354 (((cfl & CSIZE) == CS7) ? RP2_UART_CTL_DATABITS_7 : 0) |
355 (((cfl & CSIZE) == CS6) ? RP2_UART_CTL_DATABITS_6 : 0) |
356 (((cfl & CSIZE) == CS5) ? RP2_UART_CTL_DATABITS_5 : 0));
357
358 /* parity and hardware flow control */
359 rp2_rmw(up, RP2_TXRX_CTL,
360 RP2_TXRX_CTL_PARENB_m | RP2_TXRX_CTL_nPARODD_m |
361 RP2_TXRX_CTL_CMSPAR_m | RP2_TXRX_CTL_DTRFLOW_m |
362 RP2_TXRX_CTL_DSRFLOW_m | RP2_TXRX_CTL_RTSFLOW_m |
363 RP2_TXRX_CTL_CTSFLOW_m,
364 ((cfl & PARENB) ? RP2_TXRX_CTL_PARENB_m : 0) |
365 ((cfl & PARODD) ? 0 : RP2_TXRX_CTL_nPARODD_m) |
366 ((cfl & CMSPAR) ? RP2_TXRX_CTL_CMSPAR_m : 0) |
367 ((cfl & CRTSCTS) ? (RP2_TXRX_CTL_RTSFLOW_m |
368 RP2_TXRX_CTL_CTSFLOW_m) : 0));
369
370 /* XON/XOFF software flow control */
371 writeb((ifl & IXON) ? RP2_TX_SWFLOW_ena : RP2_TX_SWFLOW_dis,
372 up->ucode + RP2_TX_SWFLOW);
373 writeb((ifl & IXOFF) ? RP2_RX_SWFLOW_ena : RP2_RX_SWFLOW_dis,
374 up->ucode + RP2_RX_SWFLOW);
375 }
376
377 static void rp2_uart_set_termios(struct uart_port *port,
378 struct ktermios *new,
379 struct ktermios *old)
380 {
381 struct rp2_uart_port *up = port_to_up(port);
382 unsigned long flags;
383 unsigned int baud, baud_div;
384
385 baud = uart_get_baud_rate(port, new, old, 0, port->uartclk / 16);
386 baud_div = uart_get_divisor(port, baud);
387
388 if (tty_termios_baud_rate(new))
389 tty_termios_encode_baud_rate(new, baud, baud);
390
391 spin_lock_irqsave(&port->lock, flags);
392
393 /* ignore all characters if CREAD is not set */
394 port->ignore_status_mask = (new->c_cflag & CREAD) ? 0 : RP2_DUMMY_READ;
395
396 __rp2_uart_set_termios(up, new->c_cflag, new->c_iflag, baud_div);
397 uart_update_timeout(port, new->c_cflag, baud);
398
399 spin_unlock_irqrestore(&port->lock, flags);
400 }
401
402 static void rp2_rx_chars(struct rp2_uart_port *up)
403 {
404 u16 bytes = readw(up->base + RP2_RX_FIFO_COUNT);
405 struct tty_port *port = &up->port.state->port;
406
407 for (; bytes != 0; bytes--) {
408 u32 byte = readw(up->base + RP2_DATA_BYTE) | RP2_DUMMY_READ;
409 char ch = byte & 0xff;
410
411 if (likely(!(byte & RP2_DATA_BYTE_EXCEPTION_MASK))) {
412 if (!uart_handle_sysrq_char(&up->port, ch))
413 uart_insert_char(&up->port, byte, 0, ch,
414 TTY_NORMAL);
415 } else {
416 char flag = TTY_NORMAL;
417
418 if (byte & RP2_DATA_BYTE_BREAK_m)
419 flag = TTY_BREAK;
420 else if (byte & RP2_DATA_BYTE_ERR_FRAMING_m)
421 flag = TTY_FRAME;
422 else if (byte & RP2_DATA_BYTE_ERR_PARITY_m)
423 flag = TTY_PARITY;
424 uart_insert_char(&up->port, byte,
425 RP2_DATA_BYTE_ERR_OVERRUN_m, ch, flag);
426 }
427 up->port.icount.rx++;
428 }
429
430 spin_unlock(&up->port.lock);
431 tty_flip_buffer_push(port);
432 spin_lock(&up->port.lock);
433 }
434
435 static void rp2_tx_chars(struct rp2_uart_port *up)
436 {
437 u16 max_tx = FIFO_SIZE - readw(up->base + RP2_TX_FIFO_COUNT);
438 struct circ_buf *xmit = &up->port.state->xmit;
439
440 if (uart_tx_stopped(&up->port)) {
441 rp2_uart_stop_tx(&up->port);
442 return;
443 }
444
445 for (; max_tx != 0; max_tx--) {
446 if (up->port.x_char) {
447 writeb(up->port.x_char, up->base + RP2_DATA_BYTE);
448 up->port.x_char = 0;
449 up->port.icount.tx++;
450 continue;
451 }
452 if (uart_circ_empty(xmit)) {
453 rp2_uart_stop_tx(&up->port);
454 break;
455 }
456 writeb(xmit->buf[xmit->tail], up->base + RP2_DATA_BYTE);
457 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
458 up->port.icount.tx++;
459 }
460
461 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
462 uart_write_wakeup(&up->port);
463 }
464
465 static void rp2_ch_interrupt(struct rp2_uart_port *up)
466 {
467 u32 status;
468
469 spin_lock(&up->port.lock);
470
471 /*
472 * The IRQ status bits are clear-on-write. Other status bits in
473 * this register aren't, so it's harmless to write to them.
474 */
475 status = readl(up->base + RP2_CHAN_STAT);
476 writel(status, up->base + RP2_CHAN_STAT);
477
478 if (status & RP2_CHAN_STAT_RXDATA_m)
479 rp2_rx_chars(up);
480 if (status & RP2_CHAN_STAT_TXEMPTY_m)
481 rp2_tx_chars(up);
482 if (status & RP2_CHAN_STAT_MS_CHANGED_MASK)
483 wake_up_interruptible(&up->port.state->port.delta_msr_wait);
484
485 spin_unlock(&up->port.lock);
486 }
487
488 static int rp2_asic_interrupt(struct rp2_card *card, unsigned int asic_id)
489 {
490 void __iomem *base = card->bar1 + RP2_ASIC_OFFSET(asic_id);
491 int ch, handled = 0;
492 unsigned long status = readl(base + RP2_CH_IRQ_STAT) &
493 ~readl(base + RP2_CH_IRQ_MASK);
494
495 for_each_set_bit(ch, &status, PORTS_PER_ASIC) {
496 rp2_ch_interrupt(&card->ports[ch]);
497 handled++;
498 }
499 return handled;
500 }
501
502 static irqreturn_t rp2_uart_interrupt(int irq, void *dev_id)
503 {
504 struct rp2_card *card = dev_id;
505 int handled;
506
507 handled = rp2_asic_interrupt(card, 0);
508 if (card->n_ports >= PORTS_PER_ASIC)
509 handled += rp2_asic_interrupt(card, 1);
510
511 return handled ? IRQ_HANDLED : IRQ_NONE;
512 }
513
514 static inline void rp2_flush_fifos(struct rp2_uart_port *up)
515 {
516 rp2_rmw_set(up, RP2_UART_CTL,
517 RP2_UART_CTL_FLUSH_RX_m | RP2_UART_CTL_FLUSH_TX_m);
518 readl(up->base + RP2_UART_CTL);
519 udelay(10);
520 rp2_rmw_clr(up, RP2_UART_CTL,
521 RP2_UART_CTL_FLUSH_RX_m | RP2_UART_CTL_FLUSH_TX_m);
522 }
523
524 static int rp2_uart_startup(struct uart_port *port)
525 {
526 struct rp2_uart_port *up = port_to_up(port);
527
528 rp2_flush_fifos(up);
529 rp2_rmw(up, RP2_TXRX_CTL, RP2_TXRX_CTL_MSRIRQ_m, RP2_TXRX_CTL_RXIRQ_m);
530 rp2_rmw(up, RP2_TXRX_CTL, RP2_TXRX_CTL_RX_TRIG_m,
531 RP2_TXRX_CTL_RX_TRIG_1);
532 rp2_rmw(up, RP2_CHAN_STAT, 0, 0);
533 rp2_mask_ch_irq(up, up->idx, 1);
534
535 return 0;
536 }
537
538 static void rp2_uart_shutdown(struct uart_port *port)
539 {
540 struct rp2_uart_port *up = port_to_up(port);
541 unsigned long flags;
542
543 rp2_uart_break_ctl(port, 0);
544
545 spin_lock_irqsave(&port->lock, flags);
546 rp2_mask_ch_irq(up, up->idx, 0);
547 rp2_rmw(up, RP2_CHAN_STAT, 0, 0);
548 spin_unlock_irqrestore(&port->lock, flags);
549 }
550
551 static const char *rp2_uart_type(struct uart_port *port)
552 {
553 return (port->type == PORT_RP2) ? "RocketPort 2 UART" : NULL;
554 }
555
556 static void rp2_uart_release_port(struct uart_port *port)
557 {
558 /* Nothing to release ... */
559 }
560
561 static int rp2_uart_request_port(struct uart_port *port)
562 {
563 /* UARTs always present */
564 return 0;
565 }
566
567 static void rp2_uart_config_port(struct uart_port *port, int flags)
568 {
569 if (flags & UART_CONFIG_TYPE)
570 port->type = PORT_RP2;
571 }
572
573 static int rp2_uart_verify_port(struct uart_port *port,
574 struct serial_struct *ser)
575 {
576 if (ser->type != PORT_UNKNOWN && ser->type != PORT_RP2)
577 return -EINVAL;
578
579 return 0;
580 }
581
582 static const struct uart_ops rp2_uart_ops = {
583 .tx_empty = rp2_uart_tx_empty,
584 .set_mctrl = rp2_uart_set_mctrl,
585 .get_mctrl = rp2_uart_get_mctrl,
586 .stop_tx = rp2_uart_stop_tx,
587 .start_tx = rp2_uart_start_tx,
588 .stop_rx = rp2_uart_stop_rx,
589 .enable_ms = rp2_uart_enable_ms,
590 .break_ctl = rp2_uart_break_ctl,
591 .startup = rp2_uart_startup,
592 .shutdown = rp2_uart_shutdown,
593 .set_termios = rp2_uart_set_termios,
594 .type = rp2_uart_type,
595 .release_port = rp2_uart_release_port,
596 .request_port = rp2_uart_request_port,
597 .config_port = rp2_uart_config_port,
598 .verify_port = rp2_uart_verify_port,
599 };
600
601 static void rp2_reset_asic(struct rp2_card *card, unsigned int asic_id)
602 {
603 void __iomem *base = card->bar1 + RP2_ASIC_OFFSET(asic_id);
604 u32 clk_cfg;
605
606 writew(1, base + RP2_GLOBAL_CMD);
607 readw(base + RP2_GLOBAL_CMD);
608 msleep(100);
609 writel(0, base + RP2_CLK_PRESCALER);
610
611 /* TDM clock configuration */
612 clk_cfg = readw(base + RP2_ASIC_CFG);
613 clk_cfg = (clk_cfg & ~BIT(8)) | BIT(9);
614 writew(clk_cfg, base + RP2_ASIC_CFG);
615
616 /* IRQ routing */
617 writel(ALL_PORTS_MASK, base + RP2_CH_IRQ_MASK);
618 writel(RP2_ASIC_IRQ_EN_m, base + RP2_ASIC_IRQ);
619 }
620
621 static void rp2_init_card(struct rp2_card *card)
622 {
623 writel(4, card->bar0 + RP2_FPGA_CTL0);
624 writel(0, card->bar0 + RP2_FPGA_CTL1);
625
626 rp2_reset_asic(card, 0);
627 if (card->n_ports >= PORTS_PER_ASIC)
628 rp2_reset_asic(card, 1);
629
630 writel(RP2_IRQ_MASK_EN_m, card->bar0 + RP2_IRQ_MASK);
631 }
632
633 static void rp2_init_port(struct rp2_uart_port *up, const struct firmware *fw)
634 {
635 int i;
636
637 writel(RP2_UART_CTL_RESET_CH_m, up->base + RP2_UART_CTL);
638 readl(up->base + RP2_UART_CTL);
639 udelay(1);
640
641 writel(0, up->base + RP2_TXRX_CTL);
642 writel(0, up->base + RP2_UART_CTL);
643 readl(up->base + RP2_UART_CTL);
644 udelay(1);
645
646 rp2_flush_fifos(up);
647
648 for (i = 0; i < min_t(int, fw->size, RP2_UCODE_BYTES); i++)
649 writeb(fw->data[i], up->ucode + i);
650
651 __rp2_uart_set_termios(up, CS8 | CREAD | CLOCAL, 0, DEFAULT_BAUD_DIV);
652 rp2_uart_set_mctrl(&up->port, 0);
653
654 writeb(RP2_RX_FIFO_ena, up->ucode + RP2_RX_FIFO);
655 rp2_rmw(up, RP2_UART_CTL, RP2_UART_CTL_MODE_m,
656 RP2_UART_CTL_XMIT_EN_m | RP2_UART_CTL_MODE_rs232);
657 rp2_rmw_set(up, RP2_TXRX_CTL,
658 RP2_TXRX_CTL_TX_EN_m | RP2_TXRX_CTL_RX_EN_m);
659 }
660
661 static void rp2_remove_ports(struct rp2_card *card)
662 {
663 int i;
664
665 for (i = 0; i < card->initialized_ports; i++)
666 uart_remove_one_port(&rp2_uart_driver, &card->ports[i].port);
667 card->initialized_ports = 0;
668 }
669
670 static void rp2_fw_cb(const struct firmware *fw, void *context)
671 {
672 struct rp2_card *card = context;
673 resource_size_t phys_base;
674 int i, rc = -ENOENT;
675
676 if (!fw) {
677 dev_err(&card->pdev->dev, "cannot find '%s' firmware image\n",
678 RP2_FW_NAME);
679 goto no_fw;
680 }
681
682 phys_base = pci_resource_start(card->pdev, 1);
683
684 for (i = 0; i < card->n_ports; i++) {
685 struct rp2_uart_port *rp = &card->ports[i];
686 struct uart_port *p;
687 int j = (unsigned)i % PORTS_PER_ASIC;
688
689 rp->asic_base = card->bar1;
690 rp->base = card->bar1 + RP2_PORT_BASE + j*RP2_PORT_SPACING;
691 rp->ucode = card->bar1 + RP2_UCODE_BASE + j*RP2_UCODE_SPACING;
692 rp->card = card;
693 rp->idx = j;
694
695 p = &rp->port;
696 p->line = card->minor_start + i;
697 p->dev = &card->pdev->dev;
698 p->type = PORT_RP2;
699 p->iotype = UPIO_MEM32;
700 p->uartclk = UART_CLOCK;
701 p->regshift = 2;
702 p->fifosize = FIFO_SIZE;
703 p->ops = &rp2_uart_ops;
704 p->irq = card->pdev->irq;
705 p->membase = rp->base;
706 p->mapbase = phys_base + RP2_PORT_BASE + j*RP2_PORT_SPACING;
707
708 if (i >= PORTS_PER_ASIC) {
709 rp->asic_base += RP2_ASIC_SPACING;
710 rp->base += RP2_ASIC_SPACING;
711 rp->ucode += RP2_ASIC_SPACING;
712 p->mapbase += RP2_ASIC_SPACING;
713 }
714
715 rp2_init_port(rp, fw);
716 rc = uart_add_one_port(&rp2_uart_driver, p);
717 if (rc) {
718 dev_err(&card->pdev->dev,
719 "error registering port %d: %d\n", i, rc);
720 rp2_remove_ports(card);
721 break;
722 }
723 card->initialized_ports++;
724 }
725
726 release_firmware(fw);
727 no_fw:
728 /*
729 * rp2_fw_cb() is called from a workqueue long after rp2_probe()
730 * has already returned success. So if something failed here,
731 * we'll just leave the now-dormant device in place until somebody
732 * unbinds it.
733 */
734 if (rc)
735 dev_warn(&card->pdev->dev, "driver initialization failed\n");
736
737 complete(&card->fw_loaded);
738 }
739
740 static int rp2_probe(struct pci_dev *pdev,
741 const struct pci_device_id *id)
742 {
743 struct rp2_card *card;
744 struct rp2_uart_port *ports;
745 void __iomem * const *bars;
746 int rc;
747
748 card = devm_kzalloc(&pdev->dev, sizeof(*card), GFP_KERNEL);
749 if (!card)
750 return -ENOMEM;
751 pci_set_drvdata(pdev, card);
752 spin_lock_init(&card->card_lock);
753 init_completion(&card->fw_loaded);
754
755 rc = pcim_enable_device(pdev);
756 if (rc)
757 return rc;
758
759 rc = pcim_iomap_regions_request_all(pdev, 0x03, DRV_NAME);
760 if (rc)
761 return rc;
762
763 bars = pcim_iomap_table(pdev);
764 card->bar0 = bars[0];
765 card->bar1 = bars[1];
766 card->pdev = pdev;
767
768 rp2_decode_cap(id, &card->n_ports, &card->smpte);
769 dev_info(&pdev->dev, "found new card with %d ports\n", card->n_ports);
770
771 card->minor_start = rp2_alloc_ports(card->n_ports);
772 if (card->minor_start < 0) {
773 dev_err(&pdev->dev,
774 "too many ports (try increasing CONFIG_SERIAL_RP2_NR_UARTS)\n");
775 return -EINVAL;
776 }
777
778 rp2_init_card(card);
779
780 ports = devm_kzalloc(&pdev->dev, sizeof(*ports) * card->n_ports,
781 GFP_KERNEL);
782 if (!ports)
783 return -ENOMEM;
784 card->ports = ports;
785
786 rc = devm_request_irq(&pdev->dev, pdev->irq, rp2_uart_interrupt,
787 IRQF_SHARED, DRV_NAME, card);
788 if (rc)
789 return rc;
790
791 /*
792 * Only catastrophic errors (e.g. ENOMEM) are reported here.
793 * If the FW image is missing, we'll find out in rp2_fw_cb()
794 * and print an error message.
795 */
796 rc = request_firmware_nowait(THIS_MODULE, 1, RP2_FW_NAME, &pdev->dev,
797 GFP_KERNEL, card, rp2_fw_cb);
798 if (rc)
799 return rc;
800 dev_dbg(&pdev->dev, "waiting for firmware blob...\n");
801
802 return 0;
803 }
804
805 static void rp2_remove(struct pci_dev *pdev)
806 {
807 struct rp2_card *card = pci_get_drvdata(pdev);
808
809 wait_for_completion(&card->fw_loaded);
810 rp2_remove_ports(card);
811 }
812
813 static const struct pci_device_id rp2_pci_tbl[] = {
814
815 /* RocketPort INFINITY cards */
816
817 { RP_ID(0x0040), RP_CAP(8, 0) }, /* INF Octa, RJ45, selectable */
818 { RP_ID(0x0041), RP_CAP(32, 0) }, /* INF 32, ext interface */
819 { RP_ID(0x0042), RP_CAP(8, 0) }, /* INF Octa, ext interface */
820 { RP_ID(0x0043), RP_CAP(16, 0) }, /* INF 16, ext interface */
821 { RP_ID(0x0044), RP_CAP(4, 0) }, /* INF Quad, DB, selectable */
822 { RP_ID(0x0045), RP_CAP(8, 0) }, /* INF Octa, DB, selectable */
823 { RP_ID(0x0046), RP_CAP(4, 0) }, /* INF Quad, ext interface */
824 { RP_ID(0x0047), RP_CAP(4, 0) }, /* INF Quad, RJ45 */
825 { RP_ID(0x004a), RP_CAP(4, 0) }, /* INF Plus, Quad */
826 { RP_ID(0x004b), RP_CAP(8, 0) }, /* INF Plus, Octa */
827 { RP_ID(0x004c), RP_CAP(8, 0) }, /* INF III, Octa */
828 { RP_ID(0x004d), RP_CAP(4, 0) }, /* INF III, Quad */
829 { RP_ID(0x004e), RP_CAP(2, 0) }, /* INF Plus, 2, RS232 */
830 { RP_ID(0x004f), RP_CAP(2, 1) }, /* INF Plus, 2, SMPTE */
831 { RP_ID(0x0050), RP_CAP(4, 0) }, /* INF Plus, Quad, RJ45 */
832 { RP_ID(0x0051), RP_CAP(8, 0) }, /* INF Plus, Octa, RJ45 */
833 { RP_ID(0x0052), RP_CAP(8, 1) }, /* INF Octa, SMPTE */
834
835 /* RocketPort EXPRESS cards */
836
837 { RP_ID(0x0060), RP_CAP(8, 0) }, /* EXP Octa, RJ45, selectable */
838 { RP_ID(0x0061), RP_CAP(32, 0) }, /* EXP 32, ext interface */
839 { RP_ID(0x0062), RP_CAP(8, 0) }, /* EXP Octa, ext interface */
840 { RP_ID(0x0063), RP_CAP(16, 0) }, /* EXP 16, ext interface */
841 { RP_ID(0x0064), RP_CAP(4, 0) }, /* EXP Quad, DB, selectable */
842 { RP_ID(0x0065), RP_CAP(8, 0) }, /* EXP Octa, DB, selectable */
843 { RP_ID(0x0066), RP_CAP(4, 0) }, /* EXP Quad, ext interface */
844 { RP_ID(0x0067), RP_CAP(4, 0) }, /* EXP Quad, RJ45 */
845 { RP_ID(0x0068), RP_CAP(8, 0) }, /* EXP Octa, RJ11 */
846 { RP_ID(0x0072), RP_CAP(8, 1) }, /* EXP Octa, SMPTE */
847 { }
848 };
849 MODULE_DEVICE_TABLE(pci, rp2_pci_tbl);
850
851 static struct pci_driver rp2_pci_driver = {
852 .name = DRV_NAME,
853 .id_table = rp2_pci_tbl,
854 .probe = rp2_probe,
855 .remove = rp2_remove,
856 };
857
858 static int __init rp2_uart_init(void)
859 {
860 int rc;
861
862 rc = uart_register_driver(&rp2_uart_driver);
863 if (rc)
864 return rc;
865
866 rc = pci_register_driver(&rp2_pci_driver);
867 if (rc) {
868 uart_unregister_driver(&rp2_uart_driver);
869 return rc;
870 }
871
872 return 0;
873 }
874
875 static void __exit rp2_uart_exit(void)
876 {
877 pci_unregister_driver(&rp2_pci_driver);
878 uart_unregister_driver(&rp2_uart_driver);
879 }
880
881 module_init(rp2_uart_init);
882 module_exit(rp2_uart_exit);
883
884 MODULE_DESCRIPTION("Comtrol RocketPort EXPRESS/INFINITY driver");
885 MODULE_AUTHOR("Kevin Cernekee <cernekee@gmail.com>");
886 MODULE_LICENSE("GPL v2");
887 MODULE_FIRMWARE(RP2_FW_NAME);
Linux with added FPC-III support