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 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 89 | #ifdef CONFIG_BF54x |
| 90 | while (!(UART_GET_LSR(uart) & TEMT)) |
| 91 | continue; |
| 92 | #endif |
| 93 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 94 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 95 | disable_dma(uart->tx_dma_channel); |
| 96 | #else |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 97 | #ifdef CONFIG_BF54x |
| 98 | /* Waiting for Transmission Finished */ |
| 99 | while (!(UART_GET_LSR(uart) & TFI)) |
| 100 | continue; |
| 101 | /* Clear TFI bit */ |
| 102 | UART_PUT_LSR(uart, TFI); |
| 103 | UART_CLEAR_IER(uart, ETBEI); |
| 104 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 105 | unsigned short ier; |
| 106 | |
| 107 | ier = UART_GET_IER(uart); |
| 108 | ier &= ~ETBEI; |
| 109 | UART_PUT_IER(uart, ier); |
| 110 | #endif |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 111 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | /* |
| 115 | * port is locked and interrupts are disabled |
| 116 | */ |
| 117 | static void bfin_serial_start_tx(struct uart_port *port) |
| 118 | { |
| 119 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 120 | |
| 121 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 122 | bfin_serial_dma_tx_chars(uart); |
| 123 | #else |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 124 | #ifdef CONFIG_BF54x |
| 125 | UART_SET_IER(uart, ETBEI); |
| 126 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 127 | unsigned short ier; |
| 128 | ier = UART_GET_IER(uart); |
| 129 | ier |= ETBEI; |
| 130 | UART_PUT_IER(uart, ier); |
| 131 | bfin_serial_tx_chars(uart); |
| 132 | #endif |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 133 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Interrupts are enabled |
| 138 | */ |
| 139 | static void bfin_serial_stop_rx(struct uart_port *port) |
| 140 | { |
| 141 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 142 | #ifdef CONFIG_BF54x |
| 143 | UART_CLEAR_IER(uart, ERBFI); |
| 144 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 145 | unsigned short ier; |
| 146 | |
| 147 | ier = UART_GET_IER(uart); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 148 | #ifdef CONFIG_KGDB_UART |
| 149 | if (uart->port.line != CONFIG_KGDB_UART_PORT) |
| 150 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 151 | ier &= ~ERBFI; |
| 152 | UART_PUT_IER(uart, ier); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 153 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | /* |
| 157 | * Set the modem control timer to fire immediately. |
| 158 | */ |
| 159 | static void bfin_serial_enable_ms(struct uart_port *port) |
| 160 | { |
| 161 | } |
| 162 | |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 163 | #ifdef CONFIG_KGDB_UART |
| 164 | static int kgdb_entry_state; |
| 165 | |
| 166 | void kgdb_put_debug_char(int chr) |
| 167 | { |
| 168 | struct bfin_serial_port *uart; |
| 169 | |
| 170 | if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS) |
| 171 | uart = &bfin_serial_ports[0]; |
| 172 | else |
| 173 | uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; |
| 174 | |
| 175 | while (!(UART_GET_LSR(uart) & THRE)) { |
| 176 | __builtin_bfin_ssync(); |
| 177 | } |
| 178 | UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB)); |
| 179 | __builtin_bfin_ssync(); |
| 180 | UART_PUT_CHAR(uart, (unsigned char)chr); |
| 181 | __builtin_bfin_ssync(); |
| 182 | } |
| 183 | |
| 184 | int kgdb_get_debug_char(void) |
| 185 | { |
| 186 | struct bfin_serial_port *uart; |
| 187 | unsigned char chr; |
| 188 | |
| 189 | if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS) |
| 190 | uart = &bfin_serial_ports[0]; |
| 191 | else |
| 192 | uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; |
| 193 | |
| 194 | while(!(UART_GET_LSR(uart) & DR)) { |
| 195 | __builtin_bfin_ssync(); |
| 196 | } |
| 197 | UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB)); |
| 198 | __builtin_bfin_ssync(); |
| 199 | chr = UART_GET_CHAR(uart); |
| 200 | __builtin_bfin_ssync(); |
| 201 | |
| 202 | return chr; |
| 203 | } |
| 204 | #endif |
| 205 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 206 | #ifdef CONFIG_SERIAL_BFIN_PIO |
| 207 | static void local_put_char(struct bfin_serial_port *uart, char ch) |
| 208 | { |
| 209 | unsigned short status; |
| 210 | int flags = 0; |
| 211 | |
| 212 | spin_lock_irqsave(&uart->port.lock, flags); |
| 213 | |
| 214 | do { |
| 215 | status = UART_GET_LSR(uart); |
| 216 | } while (!(status & THRE)); |
| 217 | |
| 218 | UART_PUT_CHAR(uart, ch); |
| 219 | SSYNC(); |
| 220 | |
| 221 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 222 | } |
| 223 | |
| 224 | static void bfin_serial_rx_chars(struct bfin_serial_port *uart) |
| 225 | { |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 226 | struct tty_struct *tty = uart->port.info->tty; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 227 | unsigned int status, ch, flg; |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 228 | #ifdef CONFIG_KGDB_UART |
| 229 | struct pt_regs *regs = get_irq_regs(); |
| 230 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 231 | #ifdef BF533_FAMILY |
| 232 | static int in_break = 0; |
| 233 | #endif |
| 234 | |
| 235 | status = UART_GET_LSR(uart); |
| 236 | ch = UART_GET_CHAR(uart); |
| 237 | uart->port.icount.rx++; |
| 238 | |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 239 | #ifdef CONFIG_KGDB_UART |
| 240 | if (uart->port.line == CONFIG_KGDB_UART_PORT) { |
| 241 | if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */ |
| 242 | kgdb_breakkey_pressed(regs); |
| 243 | return; |
| 244 | } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */ |
| 245 | kgdb_entry_state = 1; |
| 246 | } else if (kgdb_entry_state == 1 && ch == 'q') { |
| 247 | kgdb_entry_state = 0; |
| 248 | kgdb_breakkey_pressed(regs); |
| 249 | return; |
| 250 | } else if (ch == 0x3) {/* Ctrl + C */ |
| 251 | kgdb_entry_state = 0; |
| 252 | kgdb_breakkey_pressed(regs); |
| 253 | return; |
| 254 | } else { |
| 255 | kgdb_entry_state = 0; |
| 256 | } |
| 257 | } |
| 258 | #endif |
| 259 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 260 | #ifdef BF533_FAMILY |
| 261 | /* The BF533 family of processors have a nice misbehavior where |
| 262 | * they continuously generate characters for a "single" break. |
| 263 | * We have to basically ignore this flood until the "next" valid |
| 264 | * character comes across. All other Blackfin families operate |
| 265 | * properly though. |
| 266 | */ |
| 267 | if (in_break) { |
| 268 | if (ch != 0) { |
| 269 | in_break = 0; |
| 270 | ch = UART_GET_CHAR(uart); |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 271 | if (bfin_revid() < 5) |
| 272 | return; |
| 273 | } else |
| 274 | return; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 275 | } |
| 276 | #endif |
| 277 | |
| 278 | if (status & BI) { |
| 279 | #ifdef BF533_FAMILY |
| 280 | in_break = 1; |
| 281 | #endif |
| 282 | uart->port.icount.brk++; |
| 283 | if (uart_handle_break(&uart->port)) |
| 284 | goto ignore_char; |
Mike Frysinger | 9808901 | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 285 | status &= ~(PE | FE); |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 286 | } |
| 287 | if (status & PE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 288 | uart->port.icount.parity++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 289 | if (status & OE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 290 | uart->port.icount.overrun++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 291 | if (status & FE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 292 | uart->port.icount.frame++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 293 | |
| 294 | status &= uart->port.read_status_mask; |
| 295 | |
| 296 | if (status & BI) |
| 297 | flg = TTY_BREAK; |
| 298 | else if (status & PE) |
| 299 | flg = TTY_PARITY; |
| 300 | else if (status & FE) |
| 301 | flg = TTY_FRAME; |
| 302 | else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 303 | flg = TTY_NORMAL; |
| 304 | |
| 305 | if (uart_handle_sysrq_char(&uart->port, ch)) |
| 306 | goto ignore_char; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 307 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 308 | uart_insert_char(&uart->port, status, OE, ch, flg); |
| 309 | |
| 310 | ignore_char: |
| 311 | tty_flip_buffer_push(tty); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | static void bfin_serial_tx_chars(struct bfin_serial_port *uart) |
| 315 | { |
| 316 | struct circ_buf *xmit = &uart->port.info->xmit; |
| 317 | |
| 318 | if (uart->port.x_char) { |
| 319 | UART_PUT_CHAR(uart, uart->port.x_char); |
| 320 | uart->port.icount.tx++; |
| 321 | uart->port.x_char = 0; |
| 322 | return; |
| 323 | } |
| 324 | /* |
| 325 | * Check the modem control lines before |
| 326 | * transmitting anything. |
| 327 | */ |
| 328 | bfin_serial_mctrl_check(uart); |
| 329 | |
| 330 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
| 331 | bfin_serial_stop_tx(&uart->port); |
| 332 | return; |
| 333 | } |
| 334 | |
| 335 | local_put_char(uart, xmit->buf[xmit->tail]); |
| 336 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 337 | uart->port.icount.tx++; |
| 338 | |
| 339 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 340 | uart_write_wakeup(&uart->port); |
| 341 | |
| 342 | if (uart_circ_empty(xmit)) |
| 343 | bfin_serial_stop_tx(&uart->port); |
| 344 | } |
| 345 | |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 346 | static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id) |
| 347 | { |
| 348 | struct bfin_serial_port *uart = dev_id; |
| 349 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 350 | #ifdef CONFIG_BF54x |
| 351 | unsigned short status; |
| 352 | spin_lock(&uart->port.lock); |
| 353 | status = UART_GET_LSR(uart); |
| 354 | while ((UART_GET_IER(uart) & ERBFI) && (status & DR)) { |
| 355 | bfin_serial_rx_chars(uart); |
| 356 | status = UART_GET_LSR(uart); |
| 357 | } |
| 358 | spin_unlock(&uart->port.lock); |
| 359 | #else |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 360 | spin_lock(&uart->port.lock); |
| 361 | while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY) |
| 362 | bfin_serial_rx_chars(uart); |
| 363 | spin_unlock(&uart->port.lock); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 364 | #endif |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 365 | return IRQ_HANDLED; |
| 366 | } |
| 367 | |
| 368 | static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 369 | { |
| 370 | struct bfin_serial_port *uart = dev_id; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 371 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 372 | #ifdef CONFIG_BF54x |
| 373 | unsigned short status; |
| 374 | spin_lock(&uart->port.lock); |
| 375 | status = UART_GET_LSR(uart); |
| 376 | while ((UART_GET_IER(uart) & ETBEI) && (status & THRE)) { |
| 377 | bfin_serial_tx_chars(uart); |
| 378 | status = UART_GET_LSR(uart); |
| 379 | } |
| 380 | spin_unlock(&uart->port.lock); |
| 381 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 382 | spin_lock(&uart->port.lock); |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 383 | while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY) |
| 384 | bfin_serial_tx_chars(uart); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 385 | spin_unlock(&uart->port.lock); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 386 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 387 | return IRQ_HANDLED; |
| 388 | } |
| 389 | |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 390 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 391 | static void bfin_serial_do_work(struct work_struct *work) |
| 392 | { |
| 393 | struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue); |
| 394 | |
| 395 | bfin_serial_mctrl_check(uart); |
| 396 | } |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 397 | #endif |
| 398 | |
| 399 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 400 | static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart) |
| 401 | { |
| 402 | struct circ_buf *xmit = &uart->port.info->xmit; |
| 403 | unsigned short ier; |
| 404 | int flags = 0; |
| 405 | |
| 406 | if (!uart->tx_done) |
| 407 | return; |
| 408 | |
| 409 | uart->tx_done = 0; |
| 410 | |
| 411 | if (uart->port.x_char) { |
| 412 | UART_PUT_CHAR(uart, uart->port.x_char); |
| 413 | uart->port.icount.tx++; |
| 414 | uart->port.x_char = 0; |
| 415 | uart->tx_done = 1; |
| 416 | return; |
| 417 | } |
| 418 | /* |
| 419 | * Check the modem control lines before |
| 420 | * transmitting anything. |
| 421 | */ |
| 422 | bfin_serial_mctrl_check(uart); |
| 423 | |
| 424 | if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) { |
| 425 | bfin_serial_stop_tx(&uart->port); |
| 426 | uart->tx_done = 1; |
| 427 | return; |
| 428 | } |
| 429 | |
| 430 | spin_lock_irqsave(&uart->port.lock, flags); |
| 431 | uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE); |
| 432 | if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail)) |
| 433 | uart->tx_count = UART_XMIT_SIZE - xmit->tail; |
| 434 | blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail), |
| 435 | (unsigned long)(xmit->buf+xmit->tail+uart->tx_count)); |
| 436 | set_dma_config(uart->tx_dma_channel, |
| 437 | set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP, |
| 438 | INTR_ON_BUF, |
| 439 | DIMENSION_LINEAR, |
| 440 | DATA_SIZE_8)); |
| 441 | set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail)); |
| 442 | set_dma_x_count(uart->tx_dma_channel, uart->tx_count); |
| 443 | set_dma_x_modify(uart->tx_dma_channel, 1); |
| 444 | enable_dma(uart->tx_dma_channel); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 445 | #ifdef CONFIG_BF54x |
| 446 | UART_SET_IER(uart, ETBEI); |
| 447 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 448 | ier = UART_GET_IER(uart); |
| 449 | ier |= ETBEI; |
| 450 | UART_PUT_IER(uart, ier); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 451 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 452 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 453 | } |
| 454 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 455 | static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 456 | { |
| 457 | struct tty_struct *tty = uart->port.info->tty; |
| 458 | int i, flg, status; |
| 459 | |
| 460 | status = UART_GET_LSR(uart); |
| 461 | uart->port.icount.rx += CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail, UART_XMIT_SIZE);; |
| 462 | |
| 463 | if (status & BI) { |
| 464 | uart->port.icount.brk++; |
| 465 | if (uart_handle_break(&uart->port)) |
| 466 | goto dma_ignore_char; |
Mike Frysinger | 9808901 | 2007-06-11 15:31:30 +0800 | [diff] [blame] | 467 | status &= ~(PE | FE); |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 468 | } |
| 469 | if (status & PE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 470 | uart->port.icount.parity++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 471 | if (status & OE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 472 | uart->port.icount.overrun++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 473 | if (status & FE) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 474 | uart->port.icount.frame++; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 475 | |
| 476 | status &= uart->port.read_status_mask; |
| 477 | |
| 478 | if (status & BI) |
| 479 | flg = TTY_BREAK; |
| 480 | else if (status & PE) |
| 481 | flg = TTY_PARITY; |
| 482 | else if (status & FE) |
| 483 | flg = TTY_FRAME; |
| 484 | else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 485 | flg = TTY_NORMAL; |
| 486 | |
| 487 | for (i = uart->rx_dma_buf.head; i < uart->rx_dma_buf.tail; i++) { |
| 488 | if (uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) |
| 489 | goto dma_ignore_char; |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 490 | 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] | 491 | } |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 492 | |
| 493 | dma_ignore_char: |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 494 | tty_flip_buffer_push(tty); |
| 495 | } |
| 496 | |
| 497 | void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) |
| 498 | { |
| 499 | int x_pos, pos; |
| 500 | int flags = 0; |
| 501 | |
| 502 | bfin_serial_dma_tx_chars(uart); |
| 503 | |
| 504 | spin_lock_irqsave(&uart->port.lock, flags); |
| 505 | x_pos = DMA_RX_XCOUNT - get_dma_curr_xcount(uart->rx_dma_channel); |
| 506 | if (x_pos == DMA_RX_XCOUNT) |
| 507 | x_pos = 0; |
| 508 | |
| 509 | pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos; |
| 510 | |
| 511 | if (pos>uart->rx_dma_buf.tail) { |
| 512 | uart->rx_dma_buf.tail = pos; |
| 513 | bfin_serial_dma_rx_chars(uart); |
| 514 | uart->rx_dma_buf.head = uart->rx_dma_buf.tail; |
| 515 | } |
| 516 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 517 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; |
| 518 | add_timer(&(uart->rx_dma_timer)); |
| 519 | } |
| 520 | |
| 521 | static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id) |
| 522 | { |
| 523 | struct bfin_serial_port *uart = dev_id; |
| 524 | struct circ_buf *xmit = &uart->port.info->xmit; |
| 525 | unsigned short ier; |
| 526 | |
| 527 | spin_lock(&uart->port.lock); |
| 528 | if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) { |
| 529 | clear_dma_irqstat(uart->tx_dma_channel); |
| 530 | disable_dma(uart->tx_dma_channel); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 531 | #ifdef CONFIG_BF54x |
| 532 | UART_CLEAR_IER(uart, ETBEI); |
| 533 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 534 | ier = UART_GET_IER(uart); |
| 535 | ier &= ~ETBEI; |
| 536 | UART_PUT_IER(uart, ier); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 537 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 538 | xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1); |
| 539 | uart->port.icount.tx+=uart->tx_count; |
| 540 | |
| 541 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 542 | uart_write_wakeup(&uart->port); |
| 543 | |
| 544 | if (uart_circ_empty(xmit)) |
| 545 | bfin_serial_stop_tx(&uart->port); |
| 546 | uart->tx_done = 1; |
| 547 | } |
| 548 | |
| 549 | spin_unlock(&uart->port.lock); |
| 550 | return IRQ_HANDLED; |
| 551 | } |
| 552 | |
| 553 | static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id) |
| 554 | { |
| 555 | struct bfin_serial_port *uart = dev_id; |
| 556 | unsigned short irqstat; |
| 557 | |
| 558 | uart->rx_dma_nrows++; |
| 559 | if (uart->rx_dma_nrows == DMA_RX_YCOUNT) { |
| 560 | uart->rx_dma_nrows = 0; |
| 561 | uart->rx_dma_buf.tail = DMA_RX_XCOUNT*DMA_RX_YCOUNT; |
| 562 | bfin_serial_dma_rx_chars(uart); |
| 563 | uart->rx_dma_buf.head = uart->rx_dma_buf.tail = 0; |
| 564 | } |
| 565 | spin_lock(&uart->port.lock); |
| 566 | irqstat = get_dma_curr_irqstat(uart->rx_dma_channel); |
| 567 | clear_dma_irqstat(uart->rx_dma_channel); |
| 568 | |
| 569 | spin_unlock(&uart->port.lock); |
| 570 | return IRQ_HANDLED; |
| 571 | } |
| 572 | #endif |
| 573 | |
| 574 | /* |
| 575 | * Return TIOCSER_TEMT when transmitter is not busy. |
| 576 | */ |
| 577 | static unsigned int bfin_serial_tx_empty(struct uart_port *port) |
| 578 | { |
| 579 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 580 | unsigned short lsr; |
| 581 | |
| 582 | lsr = UART_GET_LSR(uart); |
| 583 | if (lsr & TEMT) |
| 584 | return TIOCSER_TEMT; |
| 585 | else |
| 586 | return 0; |
| 587 | } |
| 588 | |
| 589 | static unsigned int bfin_serial_get_mctrl(struct uart_port *port) |
| 590 | { |
| 591 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 592 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 593 | if (uart->cts_pin < 0) |
| 594 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; |
| 595 | |
| 596 | if (gpio_get_value(uart->cts_pin)) |
| 597 | return TIOCM_DSR | TIOCM_CAR; |
| 598 | else |
| 599 | #endif |
| 600 | return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR; |
| 601 | } |
| 602 | |
| 603 | static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 604 | { |
| 605 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 606 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 607 | if (uart->rts_pin < 0) |
| 608 | return; |
| 609 | |
| 610 | if (mctrl & TIOCM_RTS) |
| 611 | gpio_set_value(uart->rts_pin, 0); |
| 612 | else |
| 613 | gpio_set_value(uart->rts_pin, 1); |
| 614 | #endif |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * Handle any change of modem status signal since we were last called. |
| 619 | */ |
| 620 | static void bfin_serial_mctrl_check(struct bfin_serial_port *uart) |
| 621 | { |
| 622 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 623 | unsigned int status; |
| 624 | # ifdef CONFIG_SERIAL_BFIN_DMA |
| 625 | struct uart_info *info = uart->port.info; |
| 626 | struct tty_struct *tty = info->tty; |
| 627 | |
| 628 | status = bfin_serial_get_mctrl(&uart->port); |
| 629 | if (!(status & TIOCM_CTS)) { |
| 630 | tty->hw_stopped = 1; |
| 631 | } else { |
| 632 | tty->hw_stopped = 0; |
| 633 | } |
| 634 | # else |
| 635 | status = bfin_serial_get_mctrl(&uart->port); |
| 636 | uart_handle_cts_change(&uart->port, status & TIOCM_CTS); |
| 637 | if (!(status & TIOCM_CTS)) |
| 638 | schedule_work(&uart->cts_workqueue); |
| 639 | # endif |
| 640 | #endif |
| 641 | } |
| 642 | |
| 643 | /* |
| 644 | * Interrupts are always disabled. |
| 645 | */ |
| 646 | static void bfin_serial_break_ctl(struct uart_port *port, int break_state) |
| 647 | { |
Mike Frysinger | cf68676 | 2007-06-11 16:12:49 +0800 | [diff] [blame] | 648 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 649 | u16 lcr = UART_GET_LCR(uart); |
| 650 | if (break_state) |
| 651 | lcr |= SB; |
| 652 | else |
| 653 | lcr &= ~SB; |
| 654 | UART_PUT_LCR(uart, lcr); |
| 655 | SSYNC(); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 656 | } |
| 657 | |
| 658 | static int bfin_serial_startup(struct uart_port *port) |
| 659 | { |
| 660 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 661 | |
| 662 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 663 | dma_addr_t dma_handle; |
| 664 | |
| 665 | if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) { |
| 666 | printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n"); |
| 667 | return -EBUSY; |
| 668 | } |
| 669 | |
| 670 | if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) { |
| 671 | printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n"); |
| 672 | free_dma(uart->rx_dma_channel); |
| 673 | return -EBUSY; |
| 674 | } |
| 675 | |
| 676 | set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart); |
| 677 | set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart); |
| 678 | |
| 679 | uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA); |
| 680 | uart->rx_dma_buf.head = 0; |
| 681 | uart->rx_dma_buf.tail = 0; |
| 682 | uart->rx_dma_nrows = 0; |
| 683 | |
| 684 | set_dma_config(uart->rx_dma_channel, |
| 685 | set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO, |
| 686 | INTR_ON_ROW, DIMENSION_2D, |
| 687 | DATA_SIZE_8)); |
| 688 | set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT); |
| 689 | set_dma_x_modify(uart->rx_dma_channel, 1); |
| 690 | set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT); |
| 691 | set_dma_y_modify(uart->rx_dma_channel, 1); |
| 692 | set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf); |
| 693 | enable_dma(uart->rx_dma_channel); |
| 694 | |
| 695 | uart->rx_dma_timer.data = (unsigned long)(uart); |
| 696 | uart->rx_dma_timer.function = (void *)bfin_serial_rx_dma_timeout; |
| 697 | uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; |
| 698 | add_timer(&(uart->rx_dma_timer)); |
| 699 | #else |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 700 | # ifdef CONFIG_KGDB_UART |
| 701 | if (uart->port.line != CONFIG_KGDB_UART_PORT && request_irq |
| 702 | # else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 703 | if (request_irq |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 704 | # endif |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 705 | (uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED, |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 706 | "BFIN_UART_RX", uart)) { |
| 707 | printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); |
| 708 | return -EBUSY; |
| 709 | } |
| 710 | |
| 711 | if (request_irq |
Aubrey Li | 5c4e472 | 2007-05-21 18:09:38 +0800 | [diff] [blame] | 712 | (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED, |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 713 | "BFIN_UART_TX", uart)) { |
| 714 | printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n"); |
| 715 | free_irq(uart->port.irq, uart); |
| 716 | return -EBUSY; |
| 717 | } |
| 718 | #endif |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 719 | #ifdef CONFIG_BF54x |
| 720 | UART_SET_IER(uart, ERBFI); |
| 721 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 722 | UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 723 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | static void bfin_serial_shutdown(struct uart_port *port) |
| 728 | { |
| 729 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 730 | |
| 731 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 732 | disable_dma(uart->tx_dma_channel); |
| 733 | free_dma(uart->tx_dma_channel); |
| 734 | disable_dma(uart->rx_dma_channel); |
| 735 | free_dma(uart->rx_dma_channel); |
| 736 | del_timer(&(uart->rx_dma_timer)); |
| 737 | #else |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 738 | #ifdef CONFIG_KGDB_UART |
| 739 | if (uart->port.line != CONFIG_KGDB_UART_PORT) |
| 740 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 741 | free_irq(uart->port.irq, uart); |
| 742 | free_irq(uart->port.irq+1, uart); |
| 743 | #endif |
| 744 | } |
| 745 | |
| 746 | static void |
| 747 | bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios, |
| 748 | struct ktermios *old) |
| 749 | { |
| 750 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 751 | unsigned long flags; |
| 752 | unsigned int baud, quot; |
| 753 | unsigned short val, ier, lsr, lcr = 0; |
| 754 | |
| 755 | switch (termios->c_cflag & CSIZE) { |
| 756 | case CS8: |
| 757 | lcr = WLS(8); |
| 758 | break; |
| 759 | case CS7: |
| 760 | lcr = WLS(7); |
| 761 | break; |
| 762 | case CS6: |
| 763 | lcr = WLS(6); |
| 764 | break; |
| 765 | case CS5: |
| 766 | lcr = WLS(5); |
| 767 | break; |
| 768 | default: |
| 769 | printk(KERN_ERR "%s: word lengh not supported\n", |
| 770 | __FUNCTION__); |
| 771 | } |
| 772 | |
| 773 | if (termios->c_cflag & CSTOPB) |
| 774 | lcr |= STB; |
Mike Frysinger | 19aa638 | 2007-06-11 16:16:45 +0800 | [diff] [blame] | 775 | if (termios->c_cflag & PARENB) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 776 | lcr |= PEN; |
Mike Frysinger | 19aa638 | 2007-06-11 16:16:45 +0800 | [diff] [blame] | 777 | if (!(termios->c_cflag & PARODD)) |
| 778 | lcr |= EPS; |
| 779 | if (termios->c_cflag & CMSPAR) |
| 780 | lcr |= STP; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 781 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 782 | port->read_status_mask = OE; |
| 783 | if (termios->c_iflag & INPCK) |
| 784 | port->read_status_mask |= (FE | PE); |
| 785 | if (termios->c_iflag & (BRKINT | PARMRK)) |
| 786 | port->read_status_mask |= BI; |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 787 | |
Mike Frysinger | 2ac5ee4 | 2007-05-21 18:09:39 +0800 | [diff] [blame] | 788 | /* |
| 789 | * Characters to ignore |
| 790 | */ |
| 791 | port->ignore_status_mask = 0; |
| 792 | if (termios->c_iflag & IGNPAR) |
| 793 | port->ignore_status_mask |= FE | PE; |
| 794 | if (termios->c_iflag & IGNBRK) { |
| 795 | port->ignore_status_mask |= BI; |
| 796 | /* |
| 797 | * If we're ignoring parity and break indicators, |
| 798 | * ignore overruns too (for real raw support). |
| 799 | */ |
| 800 | if (termios->c_iflag & IGNPAR) |
| 801 | port->ignore_status_mask |= OE; |
| 802 | } |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 803 | |
| 804 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); |
| 805 | quot = uart_get_divisor(port, baud); |
| 806 | spin_lock_irqsave(&uart->port.lock, flags); |
| 807 | |
| 808 | do { |
| 809 | lsr = UART_GET_LSR(uart); |
| 810 | } while (!(lsr & TEMT)); |
| 811 | |
| 812 | /* Disable UART */ |
| 813 | ier = UART_GET_IER(uart); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 814 | #ifdef CONFIG_BF54x |
| 815 | UART_CLEAR_IER(uart, 0xF); |
| 816 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 817 | UART_PUT_IER(uart, 0); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 818 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 819 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 820 | #ifndef CONFIG_BF54x |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 821 | /* Set DLAB in LCR to Access DLL and DLH */ |
| 822 | val = UART_GET_LCR(uart); |
| 823 | val |= DLAB; |
| 824 | UART_PUT_LCR(uart, val); |
| 825 | SSYNC(); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 826 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 827 | |
| 828 | UART_PUT_DLL(uart, quot & 0xFF); |
| 829 | SSYNC(); |
| 830 | UART_PUT_DLH(uart, (quot >> 8) & 0xFF); |
| 831 | SSYNC(); |
| 832 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 833 | #ifndef CONFIG_BF54x |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 834 | /* Clear DLAB in LCR to Access THR RBR IER */ |
| 835 | val = UART_GET_LCR(uart); |
| 836 | val &= ~DLAB; |
| 837 | UART_PUT_LCR(uart, val); |
| 838 | SSYNC(); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 839 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 840 | |
| 841 | UART_PUT_LCR(uart, lcr); |
| 842 | |
| 843 | /* Enable UART */ |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 844 | #ifdef CONFIG_BF54x |
| 845 | UART_SET_IER(uart, ier); |
| 846 | #else |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 847 | UART_PUT_IER(uart, ier); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 848 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 849 | |
| 850 | val = UART_GET_GCTL(uart); |
| 851 | val |= UCEN; |
| 852 | UART_PUT_GCTL(uart, val); |
| 853 | |
| 854 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 855 | } |
| 856 | |
| 857 | static const char *bfin_serial_type(struct uart_port *port) |
| 858 | { |
| 859 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 860 | |
| 861 | return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL; |
| 862 | } |
| 863 | |
| 864 | /* |
| 865 | * Release the memory region(s) being used by 'port'. |
| 866 | */ |
| 867 | static void bfin_serial_release_port(struct uart_port *port) |
| 868 | { |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * Request the memory region(s) being used by 'port'. |
| 873 | */ |
| 874 | static int bfin_serial_request_port(struct uart_port *port) |
| 875 | { |
| 876 | return 0; |
| 877 | } |
| 878 | |
| 879 | /* |
| 880 | * Configure/autoconfigure the port. |
| 881 | */ |
| 882 | static void bfin_serial_config_port(struct uart_port *port, int flags) |
| 883 | { |
| 884 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
| 885 | |
| 886 | if (flags & UART_CONFIG_TYPE && |
| 887 | bfin_serial_request_port(&uart->port) == 0) |
| 888 | uart->port.type = PORT_BFIN; |
| 889 | } |
| 890 | |
| 891 | /* |
| 892 | * Verify the new serial_struct (for TIOCSSERIAL). |
| 893 | * The only change we allow are to the flags and type, and |
| 894 | * even then only between PORT_BFIN and PORT_UNKNOWN |
| 895 | */ |
| 896 | static int |
| 897 | bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 898 | { |
| 899 | return 0; |
| 900 | } |
| 901 | |
| 902 | static struct uart_ops bfin_serial_pops = { |
| 903 | .tx_empty = bfin_serial_tx_empty, |
| 904 | .set_mctrl = bfin_serial_set_mctrl, |
| 905 | .get_mctrl = bfin_serial_get_mctrl, |
| 906 | .stop_tx = bfin_serial_stop_tx, |
| 907 | .start_tx = bfin_serial_start_tx, |
| 908 | .stop_rx = bfin_serial_stop_rx, |
| 909 | .enable_ms = bfin_serial_enable_ms, |
| 910 | .break_ctl = bfin_serial_break_ctl, |
| 911 | .startup = bfin_serial_startup, |
| 912 | .shutdown = bfin_serial_shutdown, |
| 913 | .set_termios = bfin_serial_set_termios, |
| 914 | .type = bfin_serial_type, |
| 915 | .release_port = bfin_serial_release_port, |
| 916 | .request_port = bfin_serial_request_port, |
| 917 | .config_port = bfin_serial_config_port, |
| 918 | .verify_port = bfin_serial_verify_port, |
| 919 | }; |
| 920 | |
| 921 | static void __init bfin_serial_init_ports(void) |
| 922 | { |
| 923 | static int first = 1; |
| 924 | int i; |
| 925 | |
| 926 | if (!first) |
| 927 | return; |
| 928 | first = 0; |
| 929 | |
| 930 | for (i = 0; i < nr_ports; i++) { |
| 931 | bfin_serial_ports[i].port.uartclk = get_sclk(); |
| 932 | bfin_serial_ports[i].port.ops = &bfin_serial_pops; |
| 933 | bfin_serial_ports[i].port.line = i; |
| 934 | bfin_serial_ports[i].port.iotype = UPIO_MEM; |
| 935 | bfin_serial_ports[i].port.membase = |
| 936 | (void __iomem *)bfin_serial_resource[i].uart_base_addr; |
| 937 | bfin_serial_ports[i].port.mapbase = |
| 938 | bfin_serial_resource[i].uart_base_addr; |
| 939 | bfin_serial_ports[i].port.irq = |
| 940 | bfin_serial_resource[i].uart_irq; |
| 941 | bfin_serial_ports[i].port.flags = UPF_BOOT_AUTOCONF; |
| 942 | #ifdef CONFIG_SERIAL_BFIN_DMA |
| 943 | bfin_serial_ports[i].tx_done = 1; |
| 944 | bfin_serial_ports[i].tx_count = 0; |
| 945 | bfin_serial_ports[i].tx_dma_channel = |
| 946 | bfin_serial_resource[i].uart_tx_dma_channel; |
| 947 | bfin_serial_ports[i].rx_dma_channel = |
| 948 | bfin_serial_resource[i].uart_rx_dma_channel; |
| 949 | init_timer(&(bfin_serial_ports[i].rx_dma_timer)); |
| 950 | #else |
| 951 | INIT_WORK(&bfin_serial_ports[i].cts_workqueue, bfin_serial_do_work); |
| 952 | #endif |
| 953 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 954 | bfin_serial_ports[i].cts_pin = |
| 955 | bfin_serial_resource[i].uart_cts_pin; |
| 956 | bfin_serial_ports[i].rts_pin = |
| 957 | bfin_serial_resource[i].uart_rts_pin; |
| 958 | #endif |
| 959 | bfin_serial_hw_init(&bfin_serial_ports[i]); |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 960 | } |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 961 | |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 962 | } |
| 963 | |
| 964 | #ifdef CONFIG_SERIAL_BFIN_CONSOLE |
| 965 | static void bfin_serial_console_putchar(struct uart_port *port, int ch) |
| 966 | { |
| 967 | struct bfin_serial_port *uart = (struct bfin_serial_port *)port; |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 968 | while (!(UART_GET_LSR(uart) & THRE)) |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 969 | barrier(); |
| 970 | UART_PUT_CHAR(uart, ch); |
| 971 | SSYNC(); |
| 972 | } |
| 973 | |
| 974 | /* |
| 975 | * Interrupts are disabled on entering |
| 976 | */ |
| 977 | static void |
| 978 | bfin_serial_console_write(struct console *co, const char *s, unsigned int count) |
| 979 | { |
| 980 | struct bfin_serial_port *uart = &bfin_serial_ports[co->index]; |
| 981 | int flags = 0; |
| 982 | |
| 983 | spin_lock_irqsave(&uart->port.lock, flags); |
| 984 | uart_console_write(&uart->port, s, count, bfin_serial_console_putchar); |
| 985 | spin_unlock_irqrestore(&uart->port.lock, flags); |
| 986 | |
| 987 | } |
| 988 | |
| 989 | /* |
| 990 | * If the port was already initialised (eg, by a boot loader), |
| 991 | * try to determine the current setup. |
| 992 | */ |
| 993 | static void __init |
| 994 | bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud, |
| 995 | int *parity, int *bits) |
| 996 | { |
| 997 | unsigned short status; |
| 998 | |
| 999 | status = UART_GET_IER(uart) & (ERBFI | ETBEI); |
| 1000 | if (status == (ERBFI | ETBEI)) { |
| 1001 | /* ok, the port was enabled */ |
| 1002 | unsigned short lcr, val; |
| 1003 | unsigned short dlh, dll; |
| 1004 | |
| 1005 | lcr = UART_GET_LCR(uart); |
| 1006 | |
| 1007 | *parity = 'n'; |
| 1008 | if (lcr & PEN) { |
| 1009 | if (lcr & EPS) |
| 1010 | *parity = 'e'; |
| 1011 | else |
| 1012 | *parity = 'o'; |
| 1013 | } |
| 1014 | switch (lcr & 0x03) { |
| 1015 | case 0: *bits = 5; break; |
| 1016 | case 1: *bits = 6; break; |
| 1017 | case 2: *bits = 7; break; |
| 1018 | case 3: *bits = 8; break; |
| 1019 | } |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 1020 | #ifndef CONFIG_BF54x |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1021 | /* Set DLAB in LCR to Access DLL and DLH */ |
| 1022 | val = UART_GET_LCR(uart); |
| 1023 | val |= DLAB; |
| 1024 | UART_PUT_LCR(uart, val); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 1025 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1026 | |
| 1027 | dll = UART_GET_DLL(uart); |
| 1028 | dlh = UART_GET_DLH(uart); |
| 1029 | |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 1030 | #ifndef CONFIG_BF54x |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1031 | /* Clear DLAB in LCR to Access THR RBR IER */ |
| 1032 | val = UART_GET_LCR(uart); |
| 1033 | val &= ~DLAB; |
| 1034 | UART_PUT_LCR(uart, val); |
Roy Huang | f4d640c9 | 2007-07-12 16:43:46 +0800 | [diff] [blame] | 1035 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1036 | |
| 1037 | *baud = get_sclk() / (16*(dll | dlh << 8)); |
| 1038 | } |
| 1039 | pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __FUNCTION__, *baud, *parity, *bits); |
| 1040 | } |
| 1041 | |
| 1042 | static int __init |
| 1043 | bfin_serial_console_setup(struct console *co, char *options) |
| 1044 | { |
| 1045 | struct bfin_serial_port *uart; |
| 1046 | int baud = 57600; |
| 1047 | int bits = 8; |
| 1048 | int parity = 'n'; |
| 1049 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 1050 | int flow = 'r'; |
| 1051 | #else |
| 1052 | int flow = 'n'; |
| 1053 | #endif |
| 1054 | |
| 1055 | /* |
| 1056 | * Check whether an invalid uart number has been specified, and |
| 1057 | * if so, search for the first available port that does have |
| 1058 | * console support. |
| 1059 | */ |
| 1060 | if (co->index == -1 || co->index >= nr_ports) |
| 1061 | co->index = 0; |
| 1062 | uart = &bfin_serial_ports[co->index]; |
| 1063 | |
| 1064 | if (options) |
| 1065 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 1066 | else |
| 1067 | bfin_serial_console_get_options(uart, &baud, &parity, &bits); |
| 1068 | |
| 1069 | return uart_set_options(&uart->port, co, baud, parity, bits, flow); |
| 1070 | } |
| 1071 | |
| 1072 | static struct uart_driver bfin_serial_reg; |
| 1073 | static struct console bfin_serial_console = { |
| 1074 | .name = BFIN_SERIAL_NAME, |
| 1075 | .write = bfin_serial_console_write, |
| 1076 | .device = uart_console_device, |
| 1077 | .setup = bfin_serial_console_setup, |
| 1078 | .flags = CON_PRINTBUFFER, |
| 1079 | .index = -1, |
| 1080 | .data = &bfin_serial_reg, |
| 1081 | }; |
| 1082 | |
| 1083 | static int __init bfin_serial_rs_console_init(void) |
| 1084 | { |
| 1085 | bfin_serial_init_ports(); |
| 1086 | register_console(&bfin_serial_console); |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 1087 | #ifdef CONFIG_KGDB_UART |
| 1088 | kgdb_entry_state = 0; |
| 1089 | init_kgdb_uart(); |
| 1090 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1091 | return 0; |
| 1092 | } |
| 1093 | console_initcall(bfin_serial_rs_console_init); |
| 1094 | |
| 1095 | #define BFIN_SERIAL_CONSOLE &bfin_serial_console |
| 1096 | #else |
| 1097 | #define BFIN_SERIAL_CONSOLE NULL |
| 1098 | #endif |
| 1099 | |
| 1100 | static struct uart_driver bfin_serial_reg = { |
| 1101 | .owner = THIS_MODULE, |
| 1102 | .driver_name = "bfin-uart", |
| 1103 | .dev_name = BFIN_SERIAL_NAME, |
| 1104 | .major = BFIN_SERIAL_MAJOR, |
| 1105 | .minor = BFIN_SERIAL_MINOR, |
| 1106 | .nr = NR_PORTS, |
| 1107 | .cons = BFIN_SERIAL_CONSOLE, |
| 1108 | }; |
| 1109 | |
| 1110 | static int bfin_serial_suspend(struct platform_device *dev, pm_message_t state) |
| 1111 | { |
| 1112 | struct bfin_serial_port *uart = platform_get_drvdata(dev); |
| 1113 | |
| 1114 | if (uart) |
| 1115 | uart_suspend_port(&bfin_serial_reg, &uart->port); |
| 1116 | |
| 1117 | return 0; |
| 1118 | } |
| 1119 | |
| 1120 | static int bfin_serial_resume(struct platform_device *dev) |
| 1121 | { |
| 1122 | struct bfin_serial_port *uart = platform_get_drvdata(dev); |
| 1123 | |
| 1124 | if (uart) |
| 1125 | uart_resume_port(&bfin_serial_reg, &uart->port); |
| 1126 | |
| 1127 | return 0; |
| 1128 | } |
| 1129 | |
| 1130 | static int bfin_serial_probe(struct platform_device *dev) |
| 1131 | { |
| 1132 | struct resource *res = dev->resource; |
| 1133 | int i; |
| 1134 | |
| 1135 | for (i = 0; i < dev->num_resources; i++, res++) |
| 1136 | if (res->flags & IORESOURCE_MEM) |
| 1137 | break; |
| 1138 | |
| 1139 | if (i < dev->num_resources) { |
| 1140 | for (i = 0; i < nr_ports; i++, res++) { |
| 1141 | if (bfin_serial_ports[i].port.mapbase != res->start) |
| 1142 | continue; |
| 1143 | bfin_serial_ports[i].port.dev = &dev->dev; |
| 1144 | uart_add_one_port(&bfin_serial_reg, &bfin_serial_ports[i].port); |
| 1145 | platform_set_drvdata(dev, &bfin_serial_ports[i]); |
| 1146 | } |
| 1147 | } |
| 1148 | |
| 1149 | return 0; |
| 1150 | } |
| 1151 | |
| 1152 | static int bfin_serial_remove(struct platform_device *pdev) |
| 1153 | { |
| 1154 | struct bfin_serial_port *uart = platform_get_drvdata(pdev); |
| 1155 | |
| 1156 | |
| 1157 | #ifdef CONFIG_SERIAL_BFIN_CTSRTS |
| 1158 | gpio_free(uart->cts_pin); |
| 1159 | gpio_free(uart->rts_pin); |
| 1160 | #endif |
| 1161 | |
| 1162 | platform_set_drvdata(pdev, NULL); |
| 1163 | |
| 1164 | if (uart) |
| 1165 | uart_remove_one_port(&bfin_serial_reg, &uart->port); |
| 1166 | |
| 1167 | return 0; |
| 1168 | } |
| 1169 | |
| 1170 | static struct platform_driver bfin_serial_driver = { |
| 1171 | .probe = bfin_serial_probe, |
| 1172 | .remove = bfin_serial_remove, |
| 1173 | .suspend = bfin_serial_suspend, |
| 1174 | .resume = bfin_serial_resume, |
| 1175 | .driver = { |
| 1176 | .name = "bfin-uart", |
| 1177 | }, |
| 1178 | }; |
| 1179 | |
| 1180 | static int __init bfin_serial_init(void) |
| 1181 | { |
| 1182 | int ret; |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 1183 | #ifdef CONFIG_KGDB_UART |
| 1184 | struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; |
| 1185 | struct termios t; |
| 1186 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1187 | |
| 1188 | pr_info("Serial: Blackfin serial driver\n"); |
| 1189 | |
| 1190 | bfin_serial_init_ports(); |
| 1191 | |
| 1192 | ret = uart_register_driver(&bfin_serial_reg); |
| 1193 | if (ret == 0) { |
| 1194 | ret = platform_driver_register(&bfin_serial_driver); |
| 1195 | if (ret) { |
| 1196 | pr_debug("uart register failed\n"); |
| 1197 | uart_unregister_driver(&bfin_serial_reg); |
| 1198 | } |
| 1199 | } |
Sonic Zhang | 474f1a6 | 2007-06-29 16:35:17 +0800 | [diff] [blame] | 1200 | #ifdef CONFIG_KGDB_UART |
| 1201 | if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) { |
| 1202 | request_irq(uart->port.irq, bfin_serial_int, |
| 1203 | IRQF_DISABLED, "BFIN_UART_RX", uart); |
| 1204 | pr_info("Request irq for kgdb uart port\n"); |
| 1205 | UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI); |
| 1206 | __builtin_bfin_ssync(); |
| 1207 | t.c_cflag = CS8|B57600; |
| 1208 | t.c_iflag = 0; |
| 1209 | t.c_oflag = 0; |
| 1210 | t.c_lflag = ICANON; |
| 1211 | t.c_line = CONFIG_KGDB_UART_PORT; |
| 1212 | bfin_serial_set_termios(&uart->port, &t, &t); |
| 1213 | } |
| 1214 | #endif |
Bryan Wu | 194de56 | 2007-05-06 14:50:30 -0700 | [diff] [blame] | 1215 | return ret; |
| 1216 | } |
| 1217 | |
| 1218 | static void __exit bfin_serial_exit(void) |
| 1219 | { |
| 1220 | platform_driver_unregister(&bfin_serial_driver); |
| 1221 | uart_unregister_driver(&bfin_serial_reg); |
| 1222 | } |
| 1223 | |
| 1224 | module_init(bfin_serial_init); |
| 1225 | module_exit(bfin_serial_exit); |
| 1226 | |
| 1227 | MODULE_AUTHOR("Aubrey.Li <aubrey.li@analog.com>"); |
| 1228 | MODULE_DESCRIPTION("Blackfin generic serial port driver"); |
| 1229 | MODULE_LICENSE("GPL"); |
| 1230 | MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR); |