Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File: drivers/serial/bfin_5xx.c |
| 3 | * Based on: Based on drivers/serial/sa1100.c |
| 4 | * Author: Aubrey Li <aubrey.li@analog.com> |
| 5 | * |
| 6 | * Created: |
| 7 | * Description: Driver for blackfin 5xx serial ports |
| 8 | * |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 9 | * Modified: |
| 10 | * Copyright 2006 Analog Devices Inc. |
| 11 | * |
| 12 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program; if not, see the file COPYING, or write |
| 26 | * to the Free Software Foundation, Inc., |
| 27 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 28 | */ |
| 29 | |
| 30 | #if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 31 | #define SUPPORT_SYSRQ |
| 32 | #endif |
| 33 | |
| 34 | #include <linux/module.h> |
| 35 | #include <linux/ioport.h> |
| 36 | #include <linux/init.h> |
| 37 | #include <linux/console.h> |
| 38 | #include <linux/sysrq.h> |
| 39 | #include <linux/platform_device.h> |
| 40 | #include <linux/tty.h> |
| 41 | #include <linux/tty_flip.h> |
| 42 | #include <linux/serial_core.h> |
| 43 | |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 44 | #ifdef CONFIG_KGDB_UART |
| 45 | #include <linux/kgdb.h> |
| 46 | #include <asm/irq_regs.h> |
| 47 | #endif |
| 48 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 49 | #include <asm/gpio.h> |
| 50 | #include <asm/mach/bfin_serial_5xx.h> |
| 51 | |
| 52 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 53 | #include <linux/dma-mapping.h> |
| 54 | #include <asm/io.h> |
| 55 | #include <asm/irq.h> |
| 56 | #include <asm/cacheflush.h> |
| 57 | #endif |
| 58 | |
| 59 | /* UART name and device definitions */ |
| 60 | #define BFIN_SERIAL_NAME "ttyBF" |
| 61 | #define BFIN_SERIAL_MAJOR 204 |
| 62 | #define BFIN_SERIAL_MINOR 64 |
| 63 | |
| 64 | /* |
| 65 | * Setup for console. Argument comes from the menuconfig |
| 66 | */ |
| 67 | #define DMA_RX_XCOUNT 512 |
| 68 | #define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT) |
| 69 | |
| 70 | #define DMA_RX_FLUSH_JIFFIES 5 |
| 71 | |
| 72 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 73 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart); |
| 74 | #else |
| 75 | static void bfin_serial_do_work(struct work_struct *work); |
| 76 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart); |
| 77 | static void local_put_char(struct bfin_serial_port *uart, char ch); |
| 78 | #endif |
| 79 | |
| 80 | static void bfin_serial_mctrl_check(struct bfin_serial_port *uart); |
| 81 | |
| 82 | /* |
| 83 | * interrupts are disabled on entry |
| 84 | */ |
| 85 | static void bfin_serial_stop_tx(struct uart_port *port) |
| 86 | { |
| 87 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 88 | |
| 89 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 90 | disable_dma(uart->tx_dma_channel); |
| 91 | #else |
| 92 | unsigned short ier; |
| 93 | |
| 94 | ier = UART_GET_IER(uart); |
| 95 | ier &= ~ETBEI; |
| 96 | UART_PUT_IER(uart, ier); |
| 97 | #endif |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * port is locked and interrupts are disabled |
| 102 | */ |
| 103 | static void bfin_serial_start_tx(struct uart_port *port) |
| 104 | { |
| 105 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 106 | |
| 107 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 108 | bfin_serial_dma_tx_chars(uart); |
| 109 | #else |
| 110 | unsigned short ier; |
| 111 | ier = UART_GET_IER(uart); |
| 112 | ier |= ETBEI; |
| 113 | UART_PUT_IER(uart, ier); |
| 114 | bfin_serial_tx_chars(uart); |
| 115 | #endif |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Interrupts are enabled |
| 120 | */ |
| 121 | static void bfin_serial_stop_rx(struct uart_port *port) |
| 122 | { |
| 123 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 124 | unsigned short ier; |
| 125 | |
| 126 | ier = UART_GET_IER(uart); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 127 | #ifdef CONFIG_KGDB_UART |
| 128 | if (uart->port.line != CONFIG_KGDB_UART_PORT) |
| 129 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 130 | ier &= ~ERBFI; |
| 131 | UART_PUT_IER(uart, ier); |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Set the modem control timer to fire immediately. |
| 136 | */ |
| 137 | static void bfin_serial_enable_ms(struct uart_port *port) |
| 138 | { |
| 139 | } |
| 140 | |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 141 | #ifdef CONFIG_KGDB_UART |
| 142 | static int kgdb_entry_state; |
| 143 | |
| 144 | void kgdb_put_debug_char(int chr) |
| 145 | { |
| 146 | struct bfin_serial_port *uart; |
| 147 | |
| 148 | if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS) |
| 149 | uart = &bfin_serial_ports[0]; |
| 150 | else |
| 151 | uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; |
| 152 | |
| 153 | while (!(UART_GET_LSR(uart) & THRE)) { |
| 154 | __builtin_bfin_ssync(); |
| 155 | } |
| 156 | UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB)); |
| 157 | __builtin_bfin_ssync(); |
| 158 | UART_PUT_CHAR(uart, (unsigned char)chr); |
| 159 | __builtin_bfin_ssync(); |
| 160 | } |
| 161 | |
| 162 | int kgdb_get_debug_char(void) |
| 163 | { |
| 164 | struct bfin_serial_port *uart; |
| 165 | unsigned char chr; |
| 166 | |
| 167 | if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS) |
| 168 | uart = &bfin_serial_ports[0]; |
| 169 | else |
| 170 | uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; |
| 171 | |
| 172 | while(!(UART_GET_LSR(uart) & DR)) { |
| 173 | __builtin_bfin_ssync(); |
| 174 | } |
| 175 | UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB)); |
| 176 | __builtin_bfin_ssync(); |
| 177 | chr = UART_GET_CHAR(uart); |
| 178 | __builtin_bfin_ssync(); |
| 179 | |
| 180 | return chr; |
| 181 | } |
| 182 | #endif |
| 183 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 184 | #ifdef CONFIG_SERIAL_BFIN_PIO |
| 185 | static void local_put_char(struct bfin_serial_port *uart, char ch) |
| 186 | { |
| 187 | unsigned short status; |
| 188 | int flags = 0; |
| 189 | |
| 190 | spin_lock_irqsave(&uart->port.lock, flags); |
| 191 | |
| 192 | do { |
| 193 | status = UART_GET_LSR(uart); |
| 194 | } while (!(status & THRE)); |
| 195 | |
| 196 | UART_PUT_CHAR(uart, ch); |
| 197 | SSYNC(); |
| 198 | |
| 199 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 200 | } |
| 201 | |
| 202 | static void bfin_serial_rx_chars(struct bfin_serial_port *uart) |
| 203 | { |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 204 | struct tty_struct *tty = uart->port.info->tty; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 205 | unsigned int status, ch, flg; |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 206 | #ifdef CONFIG_KGDB_UART |
| 207 | struct pt_regs *regs = get_irq_regs(); |
| 208 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 209 | #ifdef BF533_FAMILY |
| 210 | static int in_break = 0; |
| 211 | #endif |
| 212 | |
| 213 | status = UART_GET_LSR(uart); |
| 214 | ch = UART_GET_CHAR(uart); |
| 215 | uart->port.icount.rx++; |
| 216 | |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 217 | #ifdef CONFIG_KGDB_UART |
| 218 | if (uart->port.line == CONFIG_KGDB_UART_PORT) { |
| 219 | if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */ |
| 220 | kgdb_breakkey_pressed(regs); |
| 221 | return; |
| 222 | } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */ |
| 223 | kgdb_entry_state = 1; |
| 224 | } else if (kgdb_entry_state == 1 && ch == 'q') { |
| 225 | kgdb_entry_state = 0; |
| 226 | kgdb_breakkey_pressed(regs); |
| 227 | return; |
| 228 | } else if (ch == 0x3) {/* Ctrl + C */ |
| 229 | kgdb_entry_state = 0; |
| 230 | kgdb_breakkey_pressed(regs); |
| 231 | return; |
| 232 | } else { |
| 233 | kgdb_entry_state = 0; |
| 234 | } |
| 235 | } |
| 236 | #endif |
| 237 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 238 | #ifdef BF533_FAMILY |
| 239 | /* The BF533 family of processors have a nice misbehavior where |
| 240 | * they continuously generate characters for a "single" break. |
| 241 | * We have to basically ignore this flood until the "next" valid |
| 242 | * character comes across. All other Blackfin families operate |
| 243 | * properly though. |
| 244 | */ |
| 245 | if (in_break) { |
| 246 | if (ch != 0) { |
| 247 | in_break = 0; |
| 248 | ch = UART_GET_CHAR(uart); |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 249 | if (bfin_revid() < 5) |
| 250 | return; |
| 251 | } else |
| 252 | return; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 253 | } |
| 254 | #endif |
| 255 | |
| 256 | if (status & BI) { |
| 257 | #ifdef BF533_FAMILY |
| 258 | in_break = 1; |
| 259 | #endif |
| 260 | uart->port.icount.brk++; |
| 261 | if (uart_handle_break(&uart->port)) |
| 262 | goto ignore_char; |
Mike Frysinger | 9808901 | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 263 | status &= ~(PE | FE); |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 264 | } |
| 265 | if (status & PE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 266 | uart->port.icount.parity++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 267 | if (status & OE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 268 | uart->port.icount.overrun++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 269 | if (status & FE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 270 | uart->port.icount.frame++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 271 | |
| 272 | status &= uart->port.read_status_mask; |
| 273 | |
| 274 | if (status & BI) |
| 275 | flg = TTY_BREAK; |
| 276 | else if (status & PE) |
| 277 | flg = TTY_PARITY; |
| 278 | else if (status & FE) |
| 279 | flg = TTY_FRAME; |
| 280 | else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 281 | flg = TTY_NORMAL; |
| 282 | |
| 283 | if (uart_handle_sysrq_char(&uart->port, ch)) |
| 284 | goto ignore_char; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 285 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 286 | uart_insert_char(&uart->port, status, OE, ch, flg); |
| 287 | |
| 288 | ignore_char: |
| 289 | tty_flip_buffer_push(tty); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart) |
| 293 | { |
| 294 | struct circ_buf *xmit = &uart->port.info->xmit; |
| 295 | |
| 296 | if (uart->port.x_char) { |
| 297 | UART_PUT_CHAR(uart, uart->port.x_char); |
| 298 | uart->port.icount.tx++; |
| 299 | uart->port.x_char = 0; |
| 300 | return; |
| 301 | } |
| 302 | /* |
| 303 | * Check the modem control lines before |
| 304 | * transmitting anything. |
| 305 | */ |
| 306 | bfin_serial_mctrl_check(uart); |
| 307 | |
| 308 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
| 309 | bfin_serial_stop_tx(&uart->port); |
| 310 | return; |
| 311 | } |
| 312 | |
| 313 | local_put_char(uart, xmit->buf[xmit->tail]); |
| 314 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 315 | uart->port.icount.tx++; |
| 316 | |
| 317 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 318 | uart_write_wakeup(&uart->port); |
| 319 | |
| 320 | if (uart_circ_empty(xmit)) |
| 321 | bfin_serial_stop_tx(&uart->port); |
| 322 | } |
| 323 | |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 324 | static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id) |
| 325 | { |
| 326 | struct bfin_serial_port *uart = dev_id; |
| 327 | |
| 328 | spin_lock(&uart->port.lock); |
| 329 | while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY) |
| 330 | bfin_serial_rx_chars(uart); |
| 331 | spin_unlock(&uart->port.lock); |
| 332 | return IRQ_HANDLED; |
| 333 | } |
| 334 | |
| 335 | static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 336 | { |
| 337 | struct bfin_serial_port *uart = dev_id; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 338 | |
| 339 | spin_lock(&uart->port.lock); |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 340 | while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY) |
| 341 | bfin_serial_tx_chars(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 342 | spin_unlock(&uart->port.lock); |
| 343 | return IRQ_HANDLED; |
| 344 | } |
| 345 | |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 346 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 347 | static void bfin_serial_do_work(struct work_struct *work) |
| 348 | { |
| 349 | struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue); |
| 350 | |
| 351 | bfin_serial_mctrl_check(uart); |
| 352 | } |
| 353 | |
| 354 | #endif |
| 355 | |
| 356 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 357 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) |
| 358 | { |
| 359 | struct circ_buf *xmit = &uart->port.info->xmit; |
| 360 | unsigned short ier; |
| 361 | int flags = 0; |
| 362 | |
| 363 | if (!uart->tx_done) |
| 364 | return; |
| 365 | |
| 366 | uart->tx_done = 0; |
| 367 | |
| 368 | if (uart->port.x_char) { |
| 369 | UART_PUT_CHAR(uart, uart->port.x_char); |
| 370 | uart->port.icount.tx++; |
| 371 | uart->port.x_char = 0; |
| 372 | uart->tx_done = 1; |
| 373 | return; |
| 374 | } |
| 375 | /* |
| 376 | * Check the modem control lines before |
| 377 | * transmitting anything. |
| 378 | */ |
| 379 | bfin_serial_mctrl_check(uart); |
| 380 | |
| 381 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
| 382 | bfin_serial_stop_tx(&uart->port); |
| 383 | uart->tx_done = 1; |
| 384 | return; |
| 385 | } |
| 386 | |
| 387 | spin_lock_irqsave(&uart->port.lock, flags); |
| 388 | uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); |
| 389 | if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail)) |
| 390 | uart->tx_count = UART_XMIT_SIZE - xmit->tail; |
| 391 | blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail), |
| 392 | (unsigned long)(xmit->buf+xmit->tail+uart->tx_count)); |
| 393 | set_dma_config(uart->tx_dma_channel, |
| 394 | set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP, |
| 395 | INTR_ON_BUF, |
| 396 | DIMENSION_LINEAR, |
| 397 | DATA_SIZE_8)); |
| 398 | set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail)); |
| 399 | set_dma_x_count(uart->tx_dma_channel, uart->tx_count); |
| 400 | set_dma_x_modify(uart->tx_dma_channel, 1); |
| 401 | enable_dma(uart->tx_dma_channel); |
| 402 | ier = UART_GET_IER(uart); |
| 403 | ier |= ETBEI; |
| 404 | UART_PUT_IER(uart, ier); |
| 405 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 406 | } |
| 407 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 408 | static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 409 | { |
| 410 | struct tty_struct *tty = uart->port.info->tty; |
| 411 | int i, flg, status; |
| 412 | |
| 413 | status = UART_GET_LSR(uart); |
| 414 | uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);; |
| 415 | |
| 416 | if (status & BI) { |
| 417 | uart->port.icount.brk++; |
| 418 | if (uart_handle_break(&uart->port)) |
| 419 | goto dma_ignore_char; |
Mike Frysinger | 9808901 | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 420 | status &= ~(PE | FE); |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 421 | } |
| 422 | if (status & PE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 423 | uart->port.icount.parity++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 424 | if (status & OE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 425 | uart->port.icount.overrun++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 426 | if (status & FE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 427 | uart->port.icount.frame++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 428 | |
| 429 | status &= uart->port.read_status_mask; |
| 430 | |
| 431 | if (status & BI) |
| 432 | flg = TTY_BREAK; |
| 433 | else if (status & PE) |
| 434 | flg = TTY_PARITY; |
| 435 | else if (status & FE) |
| 436 | flg = TTY_FRAME; |
| 437 | else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 438 | flg = TTY_NORMAL; |
| 439 | |
| 440 | for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) { |
| 441 | if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) |
| 442 | goto dma_ignore_char; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 443 | uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 444 | } |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 445 | |
| 446 | dma_ignore_char: |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 447 | tty_flip_buffer_push(tty); |
| 448 | } |
| 449 | |
| 450 | void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) |
| 451 | { |
| 452 | int x_pos, pos; |
| 453 | int flags = 0; |
| 454 | |
| 455 | bfin_serial_dma_tx_chars(uart); |
| 456 | |
| 457 | spin_lock_irqsave(&uart->port.lock, flags); |
| 458 | x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel); |
| 459 | if (x_pos == DMA_RX_XCOUNT) |
| 460 | x_pos = 0; |
| 461 | |
| 462 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos; |
| 463 | |
| 464 | if (pos>uart->rx_dma_buf.tail) { |
| 465 | uart->rx_dma_buf.tail = pos; |
| 466 | bfin_serial_dma_rx_chars(uart); |
| 467 | uart->rx_dma_buf.head = uart->rx_dma_buf.tail; |
| 468 | } |
| 469 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 470 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; |
| 471 | add_timer(&(uart->rx_dma_timer)); |
| 472 | } |
| 473 | |
| 474 | static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) |
| 475 | { |
| 476 | struct bfin_serial_port *uart = dev_id; |
| 477 | struct circ_buf *xmit = &uart->port.info->xmit; |
| 478 | unsigned short ier; |
| 479 | |
| 480 | spin_lock(&uart->port.lock); |
| 481 | if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { |
| 482 | clear_dma_irqstat(uart->tx_dma_channel); |
| 483 | disable_dma(uart->tx_dma_channel); |
| 484 | ier = UART_GET_IER(uart); |
| 485 | ier &= ~ETBEI; |
| 486 | UART_PUT_IER(uart, ier); |
| 487 | xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1); |
| 488 | uart->port.icount.tx+=uart->tx_count; |
| 489 | |
| 490 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 491 | uart_write_wakeup(&uart->port); |
| 492 | |
| 493 | if (uart_circ_empty(xmit)) |
| 494 | bfin_serial_stop_tx(&uart->port); |
| 495 | uart->tx_done = 1; |
| 496 | } |
| 497 | |
| 498 | spin_unlock(&uart->port.lock); |
| 499 | return IRQ_HANDLED; |
| 500 | } |
| 501 | |
| 502 | static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id) |
| 503 | { |
| 504 | struct bfin_serial_port *uart = dev_id; |
| 505 | unsigned short irqstat; |
| 506 | |
| 507 | uart->rx_dma_nrows++; |
| 508 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT) { |
| 509 | uart->rx_dma_nrows = 0; |
| 510 | uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT; |
| 511 | bfin_serial_dma_rx_chars(uart); |
| 512 | uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0; |
| 513 | } |
| 514 | spin_lock(&uart->port.lock); |
| 515 | irqstat = get_dma_curr_irqstat(uart->rx_dma_channel); |
| 516 | clear_dma_irqstat(uart->rx_dma_channel); |
| 517 | |
| 518 | spin_unlock(&uart->port.lock); |
| 519 | return IRQ_HANDLED; |
| 520 | } |
| 521 | #endif |
| 522 | |
| 523 | /* |
| 524 | * Return TIOCSER_TEMT when transmitter is not busy. |
| 525 | */ |
| 526 | static unsigned int bfin_serial_tx_empty(struct uart_port *port) |
| 527 | { |
| 528 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 529 | unsigned short lsr; |
| 530 | |
| 531 | lsr = UART_GET_LSR(uart); |
| 532 | if (lsr & TEMT) |
| 533 | return TIOCSER_TEMT; |
| 534 | else |
| 535 | return 0; |
| 536 | } |
| 537 | |
| 538 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) |
| 539 | { |
| 540 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 541 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 542 | if (uart->cts_pin < 0) |
| 543 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; |
| 544 | |
| 545 | if (gpio_get_value(uart->cts_pin)) |
| 546 | return TIOCM_DSR | TIOCM_CAR; |
| 547 | else |
| 548 | #endif |
| 549 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; |
| 550 | } |
| 551 | |
| 552 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 553 | { |
| 554 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 555 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 556 | if (uart->rts_pin < 0) |
| 557 | return; |
| 558 | |
| 559 | if (mctrl & TIOCM_RTS) |
| 560 | gpio_set_value(uart->rts_pin, 0); |
| 561 | else |
| 562 | gpio_set_value(uart->rts_pin, 1); |
| 563 | #endif |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * Handle any change of modem status signal since we were last called. |
| 568 | */ |
| 569 | static void bfin_serial_mctrl_check(struct bfin_serial_port *uart) |
| 570 | { |
| 571 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 572 | unsigned int status; |
| 573 | # ifdef CONFIG_SERIAL_BFIN_DMA |
| 574 | struct uart_info *info = uart->port.info; |
| 575 | struct tty_struct *tty = info->tty; |
| 576 | |
| 577 | status = bfin_serial_get_mctrl(&uart->port); |
| 578 | if (!(status & TIOCM_CTS)) { |
| 579 | tty->hw_stopped = 1; |
| 580 | } else { |
| 581 | tty->hw_stopped = 0; |
| 582 | } |
| 583 | # else |
| 584 | status = bfin_serial_get_mctrl(&uart->port); |
| 585 | uart_handle_cts_change(&uart->port, status & TIOCM_CTS); |
| 586 | if (!(status & TIOCM_CTS)) |
| 587 | schedule_work(&uart->cts_workqueue); |
| 588 | # endif |
| 589 | #endif |
| 590 | } |
| 591 | |
| 592 | /* |
| 593 | * Interrupts are always disabled. |
| 594 | */ |
| 595 | static void bfin_serial_break_ctl(struct uart_port *port, int break_state) |
| 596 | { |
Mike Frysinger | cf68676 | 2007-06-11 16:12:49 +0800 | [diff] [blame] | 597 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 598 | u16 lcr = UART_GET_LCR(uart); |
| 599 | if (break_state) |
| 600 | lcr |= SB; |
| 601 | else |
| 602 | lcr &= ~SB; |
| 603 | UART_PUT_LCR(uart, lcr); |
| 604 | SSYNC(); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 605 | } |
| 606 | |
| 607 | static int bfin_serial_startup(struct uart_port *port) |
| 608 | { |
| 609 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 610 | |
| 611 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 612 | dma_addr_t dma_handle; |
| 613 | |
| 614 | if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) { |
| 615 | printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n"); |
| 616 | return -EBUSY; |
| 617 | } |
| 618 | |
| 619 | if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) { |
| 620 | printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n"); |
| 621 | free_dma(uart->rx_dma_channel); |
| 622 | return -EBUSY; |
| 623 | } |
| 624 | |
| 625 | set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart); |
| 626 | set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart); |
| 627 | |
| 628 | uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA); |
| 629 | uart->rx_dma_buf.head = 0; |
| 630 | uart->rx_dma_buf.tail = 0; |
| 631 | uart->rx_dma_nrows = 0; |
| 632 | |
| 633 | set_dma_config(uart->rx_dma_channel, |
| 634 | set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO, |
| 635 | INTR_ON_ROW, DIMENSION_2D, |
| 636 | DATA_SIZE_8)); |
| 637 | set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT); |
| 638 | set_dma_x_modify(uart->rx_dma_channel, 1); |
| 639 | set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT); |
| 640 | set_dma_y_modify(uart->rx_dma_channel, 1); |
| 641 | set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf); |
| 642 | enable_dma(uart->rx_dma_channel); |
| 643 | |
| 644 | uart->rx_dma_timer.data = (unsigned long)(uart); |
| 645 | uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout; |
| 646 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; |
| 647 | add_timer(&(uart->rx_dma_timer)); |
| 648 | #else |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 649 | # ifdef CONFIG_KGDB_UART |
| 650 | if (uart->port.line != CONFIG_KGDB_UART_PORT && request_irq |
| 651 | # else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 652 | if (request_irq |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 653 | # endif |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 654 | (uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED, |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 655 | "BFIN_UART_RX", uart)) { |
| 656 | printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); |
| 657 | return -EBUSY; |
| 658 | } |
| 659 | |
| 660 | if (request_irq |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 661 | (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED, |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 662 | "BFIN_UART_TX", uart)) { |
| 663 | printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n"); |
| 664 | free_irq(uart->port.irq, uart); |
| 665 | return -EBUSY; |
| 666 | } |
| 667 | #endif |
| 668 | UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI); |
| 669 | return 0; |
| 670 | } |
| 671 | |
| 672 | static void bfin_serial_shutdown(struct uart_port *port) |
| 673 | { |
| 674 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 675 | |
| 676 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 677 | disable_dma(uart->tx_dma_channel); |
| 678 | free_dma(uart->tx_dma_channel); |
| 679 | disable_dma(uart->rx_dma_channel); |
| 680 | free_dma(uart->rx_dma_channel); |
| 681 | del_timer(&(uart->rx_dma_timer)); |
| 682 | #else |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 683 | #ifdef CONFIG_KGDB_UART |
| 684 | if (uart->port.line != CONFIG_KGDB_UART_PORT) |
| 685 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 686 | free_irq(uart->port.irq, uart); |
| 687 | free_irq(uart->port.irq+1, uart); |
| 688 | #endif |
| 689 | } |
| 690 | |
| 691 | static void |
| 692 | bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, |
| 693 | struct ktermios *old) |
| 694 | { |
| 695 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 696 | unsigned long flags; |
| 697 | unsigned int baud, quot; |
| 698 | unsigned short val, ier, lsr, lcr = 0; |
| 699 | |
| 700 | switch (termios->c_cflag & CSIZE) { |
| 701 | case CS8: |
| 702 | lcr = WLS(8); |
| 703 | break; |
| 704 | case CS7: |
| 705 | lcr = WLS(7); |
| 706 | break; |
| 707 | case CS6: |
| 708 | lcr = WLS(6); |
| 709 | break; |
| 710 | case CS5: |
| 711 | lcr = WLS(5); |
| 712 | break; |
| 713 | default: |
| 714 | printk(KERN_ERR "%s: word lengh not supported\n", |
| 715 | __FUNCTION__); |
| 716 | } |
| 717 | |
| 718 | if (termios->c_cflag & CSTOPB) |
| 719 | lcr |= STB; |
Mike Frysinger | 19aa638 | 2007-06-11 16:16:45 +0800 | [diff] [blame] | 720 | if (termios->c_cflag & PARENB) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 721 | lcr |= PEN; |
Mike Frysinger | 19aa638 | 2007-06-11 16:16:45 +0800 | [diff] [blame] | 722 | if (!(termios->c_cflag & PARODD)) |
| 723 | lcr |= EPS; |
| 724 | if (termios->c_cflag & CMSPAR) |
| 725 | lcr |= STP; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 726 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 727 | port->read_status_mask = OE; |
| 728 | if (termios->c_iflag & INPCK) |
| 729 | port->read_status_mask |= (FE | PE); |
| 730 | if (termios->c_iflag & (BRKINT | PARMRK)) |
| 731 | port->read_status_mask |= BI; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 732 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 733 | /* |
| 734 | * Characters to ignore |
| 735 | */ |
| 736 | port->ignore_status_mask = 0; |
| 737 | if (termios->c_iflag & IGNPAR) |
| 738 | port->ignore_status_mask |= FE | PE; |
| 739 | if (termios->c_iflag & IGNBRK) { |
| 740 | port->ignore_status_mask |= BI; |
| 741 | /* |
| 742 | * If we're ignoring parity and break indicators, |
| 743 | * ignore overruns too (for real raw support). |
| 744 | */ |
| 745 | if (termios->c_iflag & IGNPAR) |
| 746 | port->ignore_status_mask |= OE; |
| 747 | } |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 748 | |
| 749 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); |
| 750 | quot = uart_get_divisor(port, baud); |
| 751 | spin_lock_irqsave(&uart->port.lock, flags); |
| 752 | |
| 753 | do { |
| 754 | lsr = UART_GET_LSR(uart); |
| 755 | } while (!(lsr & TEMT)); |
| 756 | |
| 757 | /* Disable UART */ |
| 758 | ier = UART_GET_IER(uart); |
| 759 | UART_PUT_IER(uart, 0); |
| 760 | |
| 761 | /* Set DLAB in LCR to Access DLL and DLH */ |
| 762 | val = UART_GET_LCR(uart); |
| 763 | val |= DLAB; |
| 764 | UART_PUT_LCR(uart, val); |
| 765 | SSYNC(); |
| 766 | |
| 767 | UART_PUT_DLL(uart, quot & 0xFF); |
| 768 | SSYNC(); |
| 769 | UART_PUT_DLH(uart, (quot >> 8) & 0xFF); |
| 770 | SSYNC(); |
| 771 | |
| 772 | /* Clear DLAB in LCR to Access THR RBR IER */ |
| 773 | val = UART_GET_LCR(uart); |
| 774 | val &= ~DLAB; |
| 775 | UART_PUT_LCR(uart, val); |
| 776 | SSYNC(); |
| 777 | |
| 778 | UART_PUT_LCR(uart, lcr); |
| 779 | |
| 780 | /* Enable UART */ |
| 781 | UART_PUT_IER(uart, ier); |
| 782 | |
| 783 | val = UART_GET_GCTL(uart); |
| 784 | val |= UCEN; |
| 785 | UART_PUT_GCTL(uart, val); |
| 786 | |
| 787 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 788 | } |
| 789 | |
| 790 | static const char *bfin_serial_type(struct uart_port *port) |
| 791 | { |
| 792 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 793 | |
| 794 | return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL; |
| 795 | } |
| 796 | |
| 797 | /* |
| 798 | * Release the memory region(s) being used by 'port'. |
| 799 | */ |
| 800 | static void bfin_serial_release_port(struct uart_port *port) |
| 801 | { |
| 802 | } |
| 803 | |
| 804 | /* |
| 805 | * Request the memory region(s) being used by 'port'. |
| 806 | */ |
| 807 | static int bfin_serial_request_port(struct uart_port *port) |
| 808 | { |
| 809 | return 0; |
| 810 | } |
| 811 | |
| 812 | /* |
| 813 | * Configure/autoconfigure the port. |
| 814 | */ |
| 815 | static void bfin_serial_config_port(struct uart_port *port, int flags) |
| 816 | { |
| 817 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 818 | |
| 819 | if (flags & UART_CONFIG_TYPE && |
| 820 | bfin_serial_request_port(&uart->port) == 0) |
| 821 | uart->port.type = PORT_BFIN; |
| 822 | } |
| 823 | |
| 824 | /* |
| 825 | * Verify the new serial_struct (for TIOCSSERIAL). |
| 826 | * The only change we allow are to the flags and type, and |
| 827 | * even then only between PORT_BFIN and PORT_UNKNOWN |
| 828 | */ |
| 829 | static int |
| 830 | bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 831 | { |
| 832 | return 0; |
| 833 | } |
| 834 | |
| 835 | static struct uart_ops bfin_serial_pops = { |
| 836 | .tx_empty = bfin_serial_tx_empty, |
| 837 | .set_mctrl = bfin_serial_set_mctrl, |
| 838 | .get_mctrl = bfin_serial_get_mctrl, |
| 839 | .stop_tx = bfin_serial_stop_tx, |
| 840 | .start_tx = bfin_serial_start_tx, |
| 841 | .stop_rx = bfin_serial_stop_rx, |
| 842 | .enable_ms = bfin_serial_enable_ms, |
| 843 | .break_ctl = bfin_serial_break_ctl, |
| 844 | .startup = bfin_serial_startup, |
| 845 | .shutdown = bfin_serial_shutdown, |
| 846 | .set_termios = bfin_serial_set_termios, |
| 847 | .type = bfin_serial_type, |
| 848 | .release_port = bfin_serial_release_port, |
| 849 | .request_port = bfin_serial_request_port, |
| 850 | .config_port = bfin_serial_config_port, |
| 851 | .verify_port = bfin_serial_verify_port, |
| 852 | }; |
| 853 | |
| 854 | static void __init bfin_serial_init_ports(void) |
| 855 | { |
| 856 | static int first = 1; |
| 857 | int i; |
| 858 | |
| 859 | if (!first) |
| 860 | return; |
| 861 | first = 0; |
| 862 | |
| 863 | for (i = 0; i < nr_ports; i++) { |
| 864 | bfin_serial_ports[i].port.uartclk = get_sclk(); |
| 865 | bfin_serial_ports[i].port.ops = &bfin_serial_pops; |
| 866 | bfin_serial_ports[i].port.line = i; |
| 867 | bfin_serial_ports[i].port.iotype = UPIO_MEM; |
| 868 | bfin_serial_ports[i].port.membase = |
| 869 | (void __iomem *)bfin_serial_resource[i].uart_base_addr; |
| 870 | bfin_serial_ports[i].port.mapbase = |
| 871 | bfin_serial_resource[i].uart_base_addr; |
| 872 | bfin_serial_ports[i].port.irq = |
| 873 | bfin_serial_resource[i].uart_irq; |
| 874 | bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF; |
| 875 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 876 | bfin_serial_ports[i].tx_done = 1; |
| 877 | bfin_serial_ports[i].tx_count = 0; |
| 878 | bfin_serial_ports[i].tx_dma_channel = |
| 879 | bfin_serial_resource[i].uart_tx_dma_channel; |
| 880 | bfin_serial_ports[i].rx_dma_channel = |
| 881 | bfin_serial_resource[i].uart_rx_dma_channel; |
| 882 | init_timer(&(bfin_serial_ports[i].rx_dma_timer)); |
| 883 | #else |
| 884 | INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work); |
| 885 | #endif |
| 886 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 887 | bfin_serial_ports[i].cts_pin = |
| 888 | bfin_serial_resource[i].uart_cts_pin; |
| 889 | bfin_serial_ports[i].rts_pin = |
| 890 | bfin_serial_resource[i].uart_rts_pin; |
| 891 | #endif |
| 892 | bfin_serial_hw_init(&bfin_serial_ports[i]); |
| 893 | |
| 894 | } |
| 895 | } |
| 896 | |
| 897 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE |
| 898 | static void bfin_serial_console_putchar(struct uart_port *port, int ch) |
| 899 | { |
| 900 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 901 | while (!(UART_GET_LSR(uart))) |
| 902 | barrier(); |
| 903 | UART_PUT_CHAR(uart, ch); |
| 904 | SSYNC(); |
| 905 | } |
| 906 | |
| 907 | /* |
| 908 | * Interrupts are disabled on entering |
| 909 | */ |
| 910 | static void |
| 911 | bfin_serial_console_write(struct console *co, const char *s, unsigned int count) |
| 912 | { |
| 913 | struct bfin_serial_port *uart = &bfin_serial_ports[co->index]; |
| 914 | int flags = 0; |
| 915 | |
| 916 | spin_lock_irqsave(&uart->port.lock, flags); |
| 917 | uart_console_write(&uart->port, s, count, bfin_serial_console_putchar); |
| 918 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 919 | |
| 920 | } |
| 921 | |
| 922 | /* |
| 923 | * If the port was already initialised (eg, by a boot loader), |
| 924 | * try to determine the current setup. |
| 925 | */ |
| 926 | static void __init |
| 927 | bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, |
| 928 | int *parity, int *bits) |
| 929 | { |
| 930 | unsigned short status; |
| 931 | |
| 932 | status = UART_GET_IER(uart) & (ERBFI | ETBEI); |
| 933 | if (status == (ERBFI | ETBEI)) { |
| 934 | /* ok, the port was enabled */ |
| 935 | unsigned short lcr, val; |
| 936 | unsigned short dlh, dll; |
| 937 | |
| 938 | lcr = UART_GET_LCR(uart); |
| 939 | |
| 940 | *parity = 'n'; |
| 941 | if (lcr & PEN) { |
| 942 | if (lcr & EPS) |
| 943 | *parity = 'e'; |
| 944 | else |
| 945 | *parity = 'o'; |
| 946 | } |
| 947 | switch (lcr & 0x03) { |
| 948 | case 0: *bits = 5; break; |
| 949 | case 1: *bits = 6; break; |
| 950 | case 2: *bits = 7; break; |
| 951 | case 3: *bits = 8; break; |
| 952 | } |
| 953 | /* Set DLAB in LCR to Access DLL and DLH */ |
| 954 | val = UART_GET_LCR(uart); |
| 955 | val |= DLAB; |
| 956 | UART_PUT_LCR(uart, val); |
| 957 | |
| 958 | dll = UART_GET_DLL(uart); |
| 959 | dlh = UART_GET_DLH(uart); |
| 960 | |
| 961 | /* Clear DLAB in LCR to Access THR RBR IER */ |
| 962 | val = UART_GET_LCR(uart); |
| 963 | val &= ~DLAB; |
| 964 | UART_PUT_LCR(uart, val); |
| 965 | |
| 966 | *baud = get_sclk() / (16*(dll | dlh << 8)); |
| 967 | } |
| 968 | pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits); |
| 969 | } |
| 970 | |
| 971 | static int __init |
| 972 | bfin_serial_console_setup(struct console *co, char *options) |
| 973 | { |
| 974 | struct bfin_serial_port *uart; |
| 975 | int baud = 57600; |
| 976 | int bits = 8; |
| 977 | int parity = 'n'; |
| 978 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 979 | int flow = 'r'; |
| 980 | #else |
| 981 | int flow = 'n'; |
| 982 | #endif |
| 983 | |
| 984 | /* |
| 985 | * Check whether an invalid uart number has been specified, and |
| 986 | * if so, search for the first available port that does have |
| 987 | * console support. |
| 988 | */ |
| 989 | if (co->index == -1 || co->index >= nr_ports) |
| 990 | co->index = 0; |
| 991 | uart = &bfin_serial_ports[co->index]; |
| 992 | |
| 993 | if (options) |
| 994 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 995 | else |
| 996 | bfin_serial_console_get_options(uart, &baud, &parity, &bits); |
| 997 | |
| 998 | return uart_set_options(&uart->port, co, baud, parity, bits, flow); |
| 999 | } |
| 1000 | |
| 1001 | static struct uart_driver bfin_serial_reg; |
| 1002 | static struct console bfin_serial_console = { |
| 1003 | .name = BFIN_SERIAL_NAME, |
| 1004 | .write = bfin_serial_console_write, |
| 1005 | .device = uart_console_device, |
| 1006 | .setup = bfin_serial_console_setup, |
| 1007 | .flags = CON_PRINTBUFFER, |
| 1008 | .index = -1, |
| 1009 | .data = &bfin_serial_reg, |
| 1010 | }; |
| 1011 | |
| 1012 | static int __init bfin_serial_rs_console_init(void) |
| 1013 | { |
| 1014 | bfin_serial_init_ports(); |
| 1015 | register_console(&bfin_serial_console); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 1016 | #ifdef CONFIG_KGDB_UART |
| 1017 | kgdb_entry_state = 0; |
| 1018 | init_kgdb_uart(); |
| 1019 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1020 | return 0; |
| 1021 | } |
| 1022 | console_initcall(bfin_serial_rs_console_init); |
| 1023 | |
| 1024 | #define BFIN_SERIAL_CONSOLE &bfin_serial_console |
| 1025 | #else |
| 1026 | #define BFIN_SERIAL_CONSOLE NULL |
| 1027 | #endif |
| 1028 | |
| 1029 | static struct uart_driver bfin_serial_reg = { |
| 1030 | .owner = THIS_MODULE, |
| 1031 | .driver_name = "bfin-uart", |
| 1032 | .dev_name = BFIN_SERIAL_NAME, |
| 1033 | .major = BFIN_SERIAL_MAJOR, |
| 1034 | .minor = BFIN_SERIAL_MINOR, |
| 1035 | .nr = NR_PORTS, |
| 1036 | .cons = BFIN_SERIAL_CONSOLE, |
| 1037 | }; |
| 1038 | |
| 1039 | static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state) |
| 1040 | { |
| 1041 | struct bfin_serial_port *uart = platform_get_drvdata(dev); |
| 1042 | |
| 1043 | if (uart) |
| 1044 | uart_suspend_port(&bfin_serial_reg, &uart->port); |
| 1045 | |
| 1046 | return 0; |
| 1047 | } |
| 1048 | |
| 1049 | static int bfin_serial_resume(struct platform_device *dev) |
| 1050 | { |
| 1051 | struct bfin_serial_port *uart = platform_get_drvdata(dev); |
| 1052 | |
| 1053 | if (uart) |
| 1054 | uart_resume_port(&bfin_serial_reg, &uart->port); |
| 1055 | |
| 1056 | return 0; |
| 1057 | } |
| 1058 | |
| 1059 | static int bfin_serial_probe(struct platform_device *dev) |
| 1060 | { |
| 1061 | struct resource *res = dev->resource; |
| 1062 | int i; |
| 1063 | |
| 1064 | for (i = 0; i < dev->num_resources; i++, res++) |
| 1065 | if (res->flags & IORESOURCE_MEM) |
| 1066 | break; |
| 1067 | |
| 1068 | if (i < dev->num_resources) { |
| 1069 | for (i = 0; i < nr_ports; i++, res++) { |
| 1070 | if (bfin_serial_ports[i].port.mapbase != res->start) |
| 1071 | continue; |
| 1072 | bfin_serial_ports[i].port.dev = &dev->dev; |
| 1073 | uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port); |
| 1074 | platform_set_drvdata(dev, &bfin_serial_ports[i]); |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | return 0; |
| 1079 | } |
| 1080 | |
| 1081 | static int bfin_serial_remove(struct platform_device *pdev) |
| 1082 | { |
| 1083 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); |
| 1084 | |
| 1085 | |
| 1086 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 1087 | gpio_free(uart->cts_pin); |
| 1088 | gpio_free(uart->rts_pin); |
| 1089 | #endif |
| 1090 | |
| 1091 | platform_set_drvdata(pdev, NULL); |
| 1092 | |
| 1093 | if (uart) |
| 1094 | uart_remove_one_port(&bfin_serial_reg, &uart->port); |
| 1095 | |
| 1096 | return 0; |
| 1097 | } |
| 1098 | |
| 1099 | static struct platform_driver bfin_serial_driver = { |
| 1100 | .probe = bfin_serial_probe, |
| 1101 | .remove = bfin_serial_remove, |
| 1102 | .suspend = bfin_serial_suspend, |
| 1103 | .resume = bfin_serial_resume, |
| 1104 | .driver = { |
| 1105 | .name = "bfin-uart", |
| 1106 | }, |
| 1107 | }; |
| 1108 | |
| 1109 | static int __init bfin_serial_init(void) |
| 1110 | { |
| 1111 | int ret; |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 1112 | #ifdef CONFIG_KGDB_UART |
| 1113 | struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; |
| 1114 | struct termios t; |
| 1115 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1116 | |
| 1117 | pr_info("Serial: Blackfin serial driver\n"); |
| 1118 | |
| 1119 | bfin_serial_init_ports(); |
| 1120 | |
| 1121 | ret = uart_register_driver(&bfin_serial_reg); |
| 1122 | if (ret == 0) { |
| 1123 | ret = platform_driver_register(&bfin_serial_driver); |
| 1124 | if (ret) { |
| 1125 | pr_debug("uart register failed\n"); |
| 1126 | uart_unregister_driver(&bfin_serial_reg); |
| 1127 | } |
| 1128 | } |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame^] | 1129 | #ifdef CONFIG_KGDB_UART |
| 1130 | if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) { |
| 1131 | request_irq(uart->port.irq, bfin_serial_int, |
| 1132 | IRQF_DISABLED, "BFIN_UART_RX", uart); |
| 1133 | pr_info("Request irq for kgdb uart port\n"); |
| 1134 | UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI); |
| 1135 | __builtin_bfin_ssync(); |
| 1136 | t.c_cflag = CS8|B57600; |
| 1137 | t.c_iflag = 0; |
| 1138 | t.c_oflag = 0; |
| 1139 | t.c_lflag = ICANON; |
| 1140 | t.c_line = CONFIG_KGDB_UART_PORT; |
| 1141 | bfin_serial_set_termios(&uart->port, &t, &t); |
| 1142 | } |
| 1143 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1144 | return ret; |
| 1145 | } |
| 1146 | |
| 1147 | static void __exit bfin_serial_exit(void) |
| 1148 | { |
| 1149 | platform_driver_unregister(&bfin_serial_driver); |
| 1150 | uart_unregister_driver(&bfin_serial_reg); |
| 1151 | } |
| 1152 | |
| 1153 | module_init(bfin_serial_init); |
| 1154 | module_exit(bfin_serial_exit); |
| 1155 | |
| 1156 | MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>"); |
| 1157 | MODULE_DESCRIPTION("Blackfin generic serial port driver"); |
| 1158 | MODULE_LICENSE("GPL"); |
| 1159 | MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR); |