Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/serial/cpm_uart.c |
| 3 | * |
| 4 | * Driver for CPM (SCC/SMC) serial ports; core driver |
| 5 | * |
| 6 | * Based on arch/ppc/cpm2_io/uart.c by Dan Malek |
| 7 | * Based on ppc8xx.c by Thomas Gleixner |
| 8 | * Based on drivers/serial/amba.c by Russell King |
| 9 | * |
Kumar Gala | 4c8d3d9 | 2005-11-13 16:06:30 -0800 | [diff] [blame^] | 10 | * Maintainer: Kumar Gala (galak@kernel.crashing.org) (CPM2) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Pantelis Antoniou (panto@intracom.gr) (CPM1) |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Copyright (C) 2004 Freescale Semiconductor, Inc. |
| 14 | * (C) 2004 Intracom, S.A. |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 15 | * (C) 2005 MontaVista Software, Inc. by Vitaly Bordug <vbordug@ru.mvista.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | * |
| 17 | * This program is free software; you can redistribute it and/or modify |
| 18 | * it under the terms of the GNU General Public License as published by |
| 19 | * the Free Software Foundation; either version 2 of the License, or |
| 20 | * (at your option) any later version. |
| 21 | * |
| 22 | * This program is distributed in the hope that it will be useful, |
| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 25 | * GNU General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU General Public License |
| 28 | * along with this program; if not, write to the Free Software |
| 29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 30 | * |
| 31 | */ |
| 32 | |
| 33 | #include <linux/config.h> |
| 34 | #include <linux/module.h> |
| 35 | #include <linux/tty.h> |
| 36 | #include <linux/ioport.h> |
| 37 | #include <linux/init.h> |
| 38 | #include <linux/serial.h> |
| 39 | #include <linux/console.h> |
| 40 | #include <linux/sysrq.h> |
| 41 | #include <linux/device.h> |
| 42 | #include <linux/bootmem.h> |
| 43 | #include <linux/dma-mapping.h> |
| 44 | |
| 45 | #include <asm/io.h> |
| 46 | #include <asm/irq.h> |
| 47 | #include <asm/delay.h> |
| 48 | |
| 49 | #if defined(CONFIG_SERIAL_CPM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 50 | #define SUPPORT_SYSRQ |
| 51 | #endif |
| 52 | |
| 53 | #include <linux/serial_core.h> |
| 54 | #include <linux/kernel.h> |
| 55 | |
| 56 | #include "cpm_uart.h" |
| 57 | |
| 58 | /***********************************************************************/ |
| 59 | |
| 60 | /* Track which ports are configured as uarts */ |
| 61 | int cpm_uart_port_map[UART_NR]; |
| 62 | /* How many ports did we config as uarts */ |
| 63 | int cpm_uart_nr; |
| 64 | |
| 65 | /**************************************************************/ |
| 66 | |
| 67 | static int cpm_uart_tx_pump(struct uart_port *port); |
| 68 | static void cpm_uart_init_smc(struct uart_cpm_port *pinfo); |
| 69 | static void cpm_uart_init_scc(struct uart_cpm_port *pinfo); |
| 70 | static void cpm_uart_initbd(struct uart_cpm_port *pinfo); |
| 71 | |
| 72 | /**************************************************************/ |
| 73 | |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 74 | static inline unsigned long cpu2cpm_addr(void *addr) |
| 75 | { |
| 76 | if ((unsigned long)addr >= CPM_ADDR) |
| 77 | return (unsigned long)addr; |
| 78 | return virt_to_bus(addr); |
| 79 | } |
| 80 | |
| 81 | static inline void *cpm2cpu_addr(unsigned long addr) |
| 82 | { |
| 83 | if (addr >= CPM_ADDR) |
| 84 | return (void *)addr; |
| 85 | return bus_to_virt(addr); |
| 86 | } |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | /* |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 89 | * Check, if transmit buffers are processed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | */ |
| 91 | static unsigned int cpm_uart_tx_empty(struct uart_port *port) |
| 92 | { |
| 93 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 94 | volatile cbd_t *bdp = pinfo->tx_bd_base; |
| 95 | int ret = 0; |
| 96 | |
| 97 | while (1) { |
| 98 | if (bdp->cbd_sc & BD_SC_READY) |
| 99 | break; |
| 100 | |
| 101 | if (bdp->cbd_sc & BD_SC_WRAP) { |
| 102 | ret = TIOCSER_TEMT; |
| 103 | break; |
| 104 | } |
| 105 | bdp++; |
| 106 | } |
| 107 | |
| 108 | pr_debug("CPM uart[%d]:tx_empty: %d\n", port->line, ret); |
| 109 | |
| 110 | return ret; |
| 111 | } |
| 112 | |
| 113 | static void cpm_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 114 | { |
| 115 | /* Whee. Do nothing. */ |
| 116 | } |
| 117 | |
| 118 | static unsigned int cpm_uart_get_mctrl(struct uart_port *port) |
| 119 | { |
| 120 | /* Whee. Do nothing. */ |
| 121 | return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * Stop transmitter |
| 126 | */ |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 127 | static void cpm_uart_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | { |
| 129 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 130 | volatile smc_t *smcp = pinfo->smcp; |
| 131 | volatile scc_t *sccp = pinfo->sccp; |
| 132 | |
| 133 | pr_debug("CPM uart[%d]:stop tx\n", port->line); |
| 134 | |
| 135 | if (IS_SMC(pinfo)) |
| 136 | smcp->smc_smcm &= ~SMCM_TX; |
| 137 | else |
| 138 | sccp->scc_sccm &= ~UART_SCCM_TX; |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * Start transmitter |
| 143 | */ |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 144 | static void cpm_uart_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | { |
| 146 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 147 | volatile smc_t *smcp = pinfo->smcp; |
| 148 | volatile scc_t *sccp = pinfo->sccp; |
| 149 | |
| 150 | pr_debug("CPM uart[%d]:start tx\n", port->line); |
| 151 | |
| 152 | if (IS_SMC(pinfo)) { |
| 153 | if (smcp->smc_smcm & SMCM_TX) |
| 154 | return; |
| 155 | } else { |
| 156 | if (sccp->scc_sccm & UART_SCCM_TX) |
| 157 | return; |
| 158 | } |
| 159 | |
| 160 | if (cpm_uart_tx_pump(port) != 0) { |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 161 | if (IS_SMC(pinfo)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | smcp->smc_smcm |= SMCM_TX; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 163 | smcp->smc_smcmr |= SMCMR_TEN; |
| 164 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | sccp->scc_sccm |= UART_SCCM_TX; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 166 | pinfo->sccp->scc_gsmrl |= SCC_GSMRL_ENT; |
| 167 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | } |
| 170 | |
| 171 | /* |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 172 | * Stop receiver |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | */ |
| 174 | static void cpm_uart_stop_rx(struct uart_port *port) |
| 175 | { |
| 176 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 177 | volatile smc_t *smcp = pinfo->smcp; |
| 178 | volatile scc_t *sccp = pinfo->sccp; |
| 179 | |
| 180 | pr_debug("CPM uart[%d]:stop rx\n", port->line); |
| 181 | |
| 182 | if (IS_SMC(pinfo)) |
| 183 | smcp->smc_smcm &= ~SMCM_RX; |
| 184 | else |
| 185 | sccp->scc_sccm &= ~UART_SCCM_RX; |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Enable Modem status interrupts |
| 190 | */ |
| 191 | static void cpm_uart_enable_ms(struct uart_port *port) |
| 192 | { |
| 193 | pr_debug("CPM uart[%d]:enable ms\n", port->line); |
| 194 | } |
| 195 | |
| 196 | /* |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 197 | * Generate a break. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | */ |
| 199 | static void cpm_uart_break_ctl(struct uart_port *port, int break_state) |
| 200 | { |
| 201 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 202 | int line = pinfo - cpm_uart_ports; |
| 203 | |
| 204 | pr_debug("CPM uart[%d]:break ctrl, break_state: %d\n", port->line, |
| 205 | break_state); |
| 206 | |
| 207 | if (break_state) |
| 208 | cpm_line_cr_cmd(line, CPM_CR_STOP_TX); |
| 209 | else |
| 210 | cpm_line_cr_cmd(line, CPM_CR_RESTART_TX); |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * Transmit characters, refill buffer descriptor, if possible |
| 215 | */ |
| 216 | static void cpm_uart_int_tx(struct uart_port *port, struct pt_regs *regs) |
| 217 | { |
| 218 | pr_debug("CPM uart[%d]:TX INT\n", port->line); |
| 219 | |
| 220 | cpm_uart_tx_pump(port); |
| 221 | } |
| 222 | |
| 223 | /* |
| 224 | * Receive characters |
| 225 | */ |
| 226 | static void cpm_uart_int_rx(struct uart_port *port, struct pt_regs *regs) |
| 227 | { |
| 228 | int i; |
| 229 | unsigned char ch, *cp; |
| 230 | struct tty_struct *tty = port->info->tty; |
| 231 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 232 | volatile cbd_t *bdp; |
| 233 | u16 status; |
| 234 | unsigned int flg; |
| 235 | |
| 236 | pr_debug("CPM uart[%d]:RX INT\n", port->line); |
| 237 | |
| 238 | /* Just loop through the closed BDs and copy the characters into |
| 239 | * the buffer. |
| 240 | */ |
| 241 | bdp = pinfo->rx_cur; |
| 242 | for (;;) { |
| 243 | /* get status */ |
| 244 | status = bdp->cbd_sc; |
| 245 | /* If this one is empty, return happy */ |
| 246 | if (status & BD_SC_EMPTY) |
| 247 | break; |
| 248 | |
| 249 | /* get number of characters, and check spce in flip-buffer */ |
| 250 | i = bdp->cbd_datlen; |
| 251 | |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 252 | /* If we have not enough room in tty flip buffer, then we try |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | * later, which will be the next rx-interrupt or a timeout |
| 254 | */ |
| 255 | if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE) { |
| 256 | tty->flip.work.func((void *)tty); |
| 257 | if ((tty->flip.count + i) >= TTY_FLIPBUF_SIZE) { |
| 258 | printk(KERN_WARNING "TTY_DONT_FLIP set\n"); |
| 259 | return; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | /* get pointer */ |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 264 | cp = cpm2cpu_addr(bdp->cbd_bufaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | /* loop through the buffer */ |
| 267 | while (i-- > 0) { |
| 268 | ch = *cp++; |
| 269 | port->icount.rx++; |
| 270 | flg = TTY_NORMAL; |
| 271 | |
| 272 | if (status & |
| 273 | (BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV)) |
| 274 | goto handle_error; |
| 275 | if (uart_handle_sysrq_char(port, ch, regs)) |
| 276 | continue; |
| 277 | |
| 278 | error_return: |
| 279 | *tty->flip.char_buf_ptr++ = ch; |
| 280 | *tty->flip.flag_buf_ptr++ = flg; |
| 281 | tty->flip.count++; |
| 282 | |
| 283 | } /* End while (i--) */ |
| 284 | |
| 285 | /* This BD is ready to be used again. Clear status. get next */ |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 286 | bdp->cbd_sc &= ~(BD_SC_BR | BD_SC_FR | BD_SC_PR | BD_SC_OV | BD_SC_ID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | bdp->cbd_sc |= BD_SC_EMPTY; |
| 288 | |
| 289 | if (bdp->cbd_sc & BD_SC_WRAP) |
| 290 | bdp = pinfo->rx_bd_base; |
| 291 | else |
| 292 | bdp++; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } /* End for (;;) */ |
| 295 | |
| 296 | /* Write back buffer pointer */ |
| 297 | pinfo->rx_cur = (volatile cbd_t *) bdp; |
| 298 | |
| 299 | /* activate BH processing */ |
| 300 | tty_flip_buffer_push(tty); |
| 301 | |
| 302 | return; |
| 303 | |
| 304 | /* Error processing */ |
| 305 | |
| 306 | handle_error: |
| 307 | /* Statistics */ |
| 308 | if (status & BD_SC_BR) |
| 309 | port->icount.brk++; |
| 310 | if (status & BD_SC_PR) |
| 311 | port->icount.parity++; |
| 312 | if (status & BD_SC_FR) |
| 313 | port->icount.frame++; |
| 314 | if (status & BD_SC_OV) |
| 315 | port->icount.overrun++; |
| 316 | |
| 317 | /* Mask out ignored conditions */ |
| 318 | status &= port->read_status_mask; |
| 319 | |
| 320 | /* Handle the remaining ones */ |
| 321 | if (status & BD_SC_BR) |
| 322 | flg = TTY_BREAK; |
| 323 | else if (status & BD_SC_PR) |
| 324 | flg = TTY_PARITY; |
| 325 | else if (status & BD_SC_FR) |
| 326 | flg = TTY_FRAME; |
| 327 | |
| 328 | /* overrun does not affect the current character ! */ |
| 329 | if (status & BD_SC_OV) { |
| 330 | ch = 0; |
| 331 | flg = TTY_OVERRUN; |
| 332 | /* We skip this buffer */ |
| 333 | /* CHECK: Is really nothing senseful there */ |
| 334 | /* ASSUMPTION: it contains nothing valid */ |
| 335 | i = 0; |
| 336 | } |
| 337 | #ifdef SUPPORT_SYSRQ |
| 338 | port->sysrq = 0; |
| 339 | #endif |
| 340 | goto error_return; |
| 341 | } |
| 342 | |
| 343 | /* |
| 344 | * Asynchron mode interrupt handler |
| 345 | */ |
| 346 | static irqreturn_t cpm_uart_int(int irq, void *data, struct pt_regs *regs) |
| 347 | { |
| 348 | u8 events; |
| 349 | struct uart_port *port = (struct uart_port *)data; |
| 350 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 351 | volatile smc_t *smcp = pinfo->smcp; |
| 352 | volatile scc_t *sccp = pinfo->sccp; |
| 353 | |
| 354 | pr_debug("CPM uart[%d]:IRQ\n", port->line); |
| 355 | |
| 356 | if (IS_SMC(pinfo)) { |
| 357 | events = smcp->smc_smce; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 358 | smcp->smc_smce = events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | if (events & SMCM_BRKE) |
| 360 | uart_handle_break(port); |
| 361 | if (events & SMCM_RX) |
| 362 | cpm_uart_int_rx(port, regs); |
| 363 | if (events & SMCM_TX) |
| 364 | cpm_uart_int_tx(port, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | } else { |
| 366 | events = sccp->scc_scce; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 367 | sccp->scc_scce = events; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | if (events & UART_SCCM_BRKE) |
| 369 | uart_handle_break(port); |
| 370 | if (events & UART_SCCM_RX) |
| 371 | cpm_uart_int_rx(port, regs); |
| 372 | if (events & UART_SCCM_TX) |
| 373 | cpm_uart_int_tx(port, regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | } |
| 375 | return (events) ? IRQ_HANDLED : IRQ_NONE; |
| 376 | } |
| 377 | |
| 378 | static int cpm_uart_startup(struct uart_port *port) |
| 379 | { |
| 380 | int retval; |
| 381 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 382 | int line = pinfo - cpm_uart_ports; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
| 384 | pr_debug("CPM uart[%d]:startup\n", port->line); |
| 385 | |
| 386 | /* Install interrupt handler. */ |
| 387 | retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port); |
| 388 | if (retval) |
| 389 | return retval; |
| 390 | |
| 391 | /* Startup rx-int */ |
| 392 | if (IS_SMC(pinfo)) { |
| 393 | pinfo->smcp->smc_smcm |= SMCM_RX; |
| 394 | pinfo->smcp->smc_smcmr |= SMCMR_REN; |
| 395 | } else { |
| 396 | pinfo->sccp->scc_sccm |= UART_SCCM_RX; |
| 397 | } |
| 398 | |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 399 | if (!(pinfo->flags & FLAG_CONSOLE)) |
| 400 | cpm_line_cr_cmd(line,CPM_CR_INIT_TRX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | return 0; |
| 402 | } |
| 403 | |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 404 | inline void cpm_uart_wait_until_send(struct uart_cpm_port *pinfo) |
| 405 | { |
Kumar Gala | 638861d | 2005-09-03 15:55:37 -0700 | [diff] [blame] | 406 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 407 | schedule_timeout(pinfo->wait_closing); |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 408 | } |
| 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | /* |
| 411 | * Shutdown the uart |
| 412 | */ |
| 413 | static void cpm_uart_shutdown(struct uart_port *port) |
| 414 | { |
| 415 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 416 | int line = pinfo - cpm_uart_ports; |
| 417 | |
| 418 | pr_debug("CPM uart[%d]:shutdown\n", port->line); |
| 419 | |
| 420 | /* free interrupt handler */ |
| 421 | free_irq(port->irq, port); |
| 422 | |
| 423 | /* If the port is not the console, disable Rx and Tx. */ |
| 424 | if (!(pinfo->flags & FLAG_CONSOLE)) { |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 425 | /* Wait for all the BDs marked sent */ |
Kumar Gala | 638861d | 2005-09-03 15:55:37 -0700 | [diff] [blame] | 426 | while(!cpm_uart_tx_empty(port)) { |
| 427 | set_current_state(TASK_UNINTERRUPTIBLE); |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 428 | schedule_timeout(2); |
Kumar Gala | 638861d | 2005-09-03 15:55:37 -0700 | [diff] [blame] | 429 | } |
| 430 | |
| 431 | if (pinfo->wait_closing) |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 432 | cpm_uart_wait_until_send(pinfo); |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | /* Stop uarts */ |
| 435 | if (IS_SMC(pinfo)) { |
| 436 | volatile smc_t *smcp = pinfo->smcp; |
| 437 | smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN); |
| 438 | smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX); |
| 439 | } else { |
| 440 | volatile scc_t *sccp = pinfo->sccp; |
| 441 | sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); |
| 442 | sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX); |
| 443 | } |
| 444 | |
| 445 | /* Shut them really down and reinit buffer descriptors */ |
| 446 | cpm_line_cr_cmd(line, CPM_CR_STOP_TX); |
| 447 | cpm_uart_initbd(pinfo); |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | static void cpm_uart_set_termios(struct uart_port *port, |
| 452 | struct termios *termios, struct termios *old) |
| 453 | { |
| 454 | int baud; |
| 455 | unsigned long flags; |
| 456 | u16 cval, scval, prev_mode; |
| 457 | int bits, sbits; |
| 458 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 459 | volatile smc_t *smcp = pinfo->smcp; |
| 460 | volatile scc_t *sccp = pinfo->sccp; |
| 461 | |
| 462 | pr_debug("CPM uart[%d]:set_termios\n", port->line); |
| 463 | |
| 464 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); |
| 465 | |
| 466 | /* Character length programmed into the mode register is the |
| 467 | * sum of: 1 start bit, number of data bits, 0 or 1 parity bit, |
| 468 | * 1 or 2 stop bits, minus 1. |
| 469 | * The value 'bits' counts this for us. |
| 470 | */ |
| 471 | cval = 0; |
| 472 | scval = 0; |
| 473 | |
| 474 | /* byte size */ |
| 475 | switch (termios->c_cflag & CSIZE) { |
| 476 | case CS5: |
| 477 | bits = 5; |
| 478 | break; |
| 479 | case CS6: |
| 480 | bits = 6; |
| 481 | break; |
| 482 | case CS7: |
| 483 | bits = 7; |
| 484 | break; |
| 485 | case CS8: |
| 486 | bits = 8; |
| 487 | break; |
| 488 | /* Never happens, but GCC is too dumb to figure it out */ |
| 489 | default: |
| 490 | bits = 8; |
| 491 | break; |
| 492 | } |
| 493 | sbits = bits - 5; |
| 494 | |
| 495 | if (termios->c_cflag & CSTOPB) { |
| 496 | cval |= SMCMR_SL; /* Two stops */ |
| 497 | scval |= SCU_PSMR_SL; |
| 498 | bits++; |
| 499 | } |
| 500 | |
| 501 | if (termios->c_cflag & PARENB) { |
| 502 | cval |= SMCMR_PEN; |
| 503 | scval |= SCU_PSMR_PEN; |
| 504 | bits++; |
| 505 | if (!(termios->c_cflag & PARODD)) { |
| 506 | cval |= SMCMR_PM_EVEN; |
| 507 | scval |= (SCU_PSMR_REVP | SCU_PSMR_TEVP); |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * Set up parity check flag |
| 513 | */ |
| 514 | #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) |
| 515 | |
| 516 | port->read_status_mask = (BD_SC_EMPTY | BD_SC_OV); |
| 517 | if (termios->c_iflag & INPCK) |
| 518 | port->read_status_mask |= BD_SC_FR | BD_SC_PR; |
| 519 | if ((termios->c_iflag & BRKINT) || (termios->c_iflag & PARMRK)) |
| 520 | port->read_status_mask |= BD_SC_BR; |
| 521 | |
| 522 | /* |
| 523 | * Characters to ignore |
| 524 | */ |
| 525 | port->ignore_status_mask = 0; |
| 526 | if (termios->c_iflag & IGNPAR) |
| 527 | port->ignore_status_mask |= BD_SC_PR | BD_SC_FR; |
| 528 | if (termios->c_iflag & IGNBRK) { |
| 529 | port->ignore_status_mask |= BD_SC_BR; |
| 530 | /* |
| 531 | * If we're ignore parity and break indicators, ignore |
| 532 | * overruns too. (For real raw support). |
| 533 | */ |
| 534 | if (termios->c_iflag & IGNPAR) |
| 535 | port->ignore_status_mask |= BD_SC_OV; |
| 536 | } |
| 537 | /* |
| 538 | * !!! ignore all characters if CREAD is not set |
| 539 | */ |
| 540 | if ((termios->c_cflag & CREAD) == 0) |
| 541 | port->read_status_mask &= ~BD_SC_EMPTY; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 542 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | spin_lock_irqsave(&port->lock, flags); |
| 544 | |
| 545 | /* Start bit has not been added (so don't, because we would just |
| 546 | * subtract it later), and we need to add one for the number of |
| 547 | * stops bits (there is always at least one). |
| 548 | */ |
| 549 | bits++; |
| 550 | if (IS_SMC(pinfo)) { |
| 551 | /* Set the mode register. We want to keep a copy of the |
| 552 | * enables, because we want to put them back if they were |
| 553 | * present. |
| 554 | */ |
| 555 | prev_mode = smcp->smc_smcmr; |
| 556 | smcp->smc_smcmr = smcr_mk_clen(bits) | cval | SMCMR_SM_UART; |
| 557 | smcp->smc_smcmr |= (prev_mode & (SMCMR_REN | SMCMR_TEN)); |
| 558 | } else { |
| 559 | sccp->scc_psmr = (sbits << 12) | scval; |
| 560 | } |
| 561 | |
| 562 | cpm_set_brg(pinfo->brg - 1, baud); |
| 563 | spin_unlock_irqrestore(&port->lock, flags); |
| 564 | |
| 565 | } |
| 566 | |
| 567 | static const char *cpm_uart_type(struct uart_port *port) |
| 568 | { |
| 569 | pr_debug("CPM uart[%d]:uart_type\n", port->line); |
| 570 | |
| 571 | return port->type == PORT_CPM ? "CPM UART" : NULL; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * verify the new serial_struct (for TIOCSSERIAL). |
| 576 | */ |
| 577 | static int cpm_uart_verify_port(struct uart_port *port, |
| 578 | struct serial_struct *ser) |
| 579 | { |
| 580 | int ret = 0; |
| 581 | |
| 582 | pr_debug("CPM uart[%d]:verify_port\n", port->line); |
| 583 | |
| 584 | if (ser->type != PORT_UNKNOWN && ser->type != PORT_CPM) |
| 585 | ret = -EINVAL; |
| 586 | if (ser->irq < 0 || ser->irq >= NR_IRQS) |
| 587 | ret = -EINVAL; |
| 588 | if (ser->baud_base < 9600) |
| 589 | ret = -EINVAL; |
| 590 | return ret; |
| 591 | } |
| 592 | |
| 593 | /* |
| 594 | * Transmit characters, refill buffer descriptor, if possible |
| 595 | */ |
| 596 | static int cpm_uart_tx_pump(struct uart_port *port) |
| 597 | { |
| 598 | volatile cbd_t *bdp; |
| 599 | unsigned char *p; |
| 600 | int count; |
| 601 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 602 | struct circ_buf *xmit = &port->info->xmit; |
| 603 | |
| 604 | /* Handle xon/xoff */ |
| 605 | if (port->x_char) { |
| 606 | /* Pick next descriptor and fill from buffer */ |
| 607 | bdp = pinfo->tx_cur; |
| 608 | |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 609 | p = cpm2cpu_addr(bdp->cbd_bufaddr); |
| 610 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | *p++ = xmit->buf[xmit->tail]; |
| 612 | bdp->cbd_datlen = 1; |
| 613 | bdp->cbd_sc |= BD_SC_READY; |
| 614 | /* Get next BD. */ |
| 615 | if (bdp->cbd_sc & BD_SC_WRAP) |
| 616 | bdp = pinfo->tx_bd_base; |
| 617 | else |
| 618 | bdp++; |
| 619 | pinfo->tx_cur = bdp; |
| 620 | |
| 621 | port->icount.tx++; |
| 622 | port->x_char = 0; |
| 623 | return 1; |
| 624 | } |
| 625 | |
| 626 | if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 627 | cpm_uart_stop_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | /* Pick next descriptor and fill from buffer */ |
| 632 | bdp = pinfo->tx_cur; |
| 633 | |
| 634 | while (!(bdp->cbd_sc & BD_SC_READY) && (xmit->tail != xmit->head)) { |
| 635 | count = 0; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 636 | p = cpm2cpu_addr(bdp->cbd_bufaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | while (count < pinfo->tx_fifosize) { |
| 638 | *p++ = xmit->buf[xmit->tail]; |
| 639 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 640 | port->icount.tx++; |
| 641 | count++; |
| 642 | if (xmit->head == xmit->tail) |
| 643 | break; |
| 644 | } |
| 645 | bdp->cbd_datlen = count; |
| 646 | bdp->cbd_sc |= BD_SC_READY; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 647 | __asm__("eieio"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | /* Get next BD. */ |
| 649 | if (bdp->cbd_sc & BD_SC_WRAP) |
| 650 | bdp = pinfo->tx_bd_base; |
| 651 | else |
| 652 | bdp++; |
| 653 | } |
| 654 | pinfo->tx_cur = bdp; |
| 655 | |
| 656 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 657 | uart_write_wakeup(port); |
| 658 | |
| 659 | if (uart_circ_empty(xmit)) { |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 660 | cpm_uart_stop_tx(port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | return 0; |
| 662 | } |
| 663 | |
| 664 | return 1; |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * init buffer descriptors |
| 669 | */ |
| 670 | static void cpm_uart_initbd(struct uart_cpm_port *pinfo) |
| 671 | { |
| 672 | int i; |
| 673 | u8 *mem_addr; |
| 674 | volatile cbd_t *bdp; |
| 675 | |
| 676 | pr_debug("CPM uart[%d]:initbd\n", pinfo->port.line); |
| 677 | |
| 678 | /* Set the physical address of the host memory |
| 679 | * buffers in the buffer descriptors, and the |
| 680 | * virtual address for us to work with. |
| 681 | */ |
| 682 | mem_addr = pinfo->mem_addr; |
| 683 | bdp = pinfo->rx_cur = pinfo->rx_bd_base; |
| 684 | for (i = 0; i < (pinfo->rx_nrfifos - 1); i++, bdp++) { |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 685 | bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | bdp->cbd_sc = BD_SC_EMPTY | BD_SC_INTRPT; |
| 687 | mem_addr += pinfo->rx_fifosize; |
| 688 | } |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 689 | |
| 690 | bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | bdp->cbd_sc = BD_SC_WRAP | BD_SC_EMPTY | BD_SC_INTRPT; |
| 692 | |
| 693 | /* Set the physical address of the host memory |
| 694 | * buffers in the buffer descriptors, and the |
| 695 | * virtual address for us to work with. |
| 696 | */ |
| 697 | mem_addr = pinfo->mem_addr + L1_CACHE_ALIGN(pinfo->rx_nrfifos * pinfo->rx_fifosize); |
| 698 | bdp = pinfo->tx_cur = pinfo->tx_bd_base; |
| 699 | for (i = 0; i < (pinfo->tx_nrfifos - 1); i++, bdp++) { |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 700 | bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | bdp->cbd_sc = BD_SC_INTRPT; |
| 702 | mem_addr += pinfo->tx_fifosize; |
| 703 | } |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 704 | |
| 705 | bdp->cbd_bufaddr = cpu2cpm_addr(mem_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | bdp->cbd_sc = BD_SC_WRAP | BD_SC_INTRPT; |
| 707 | } |
| 708 | |
| 709 | static void cpm_uart_init_scc(struct uart_cpm_port *pinfo) |
| 710 | { |
| 711 | int line = pinfo - cpm_uart_ports; |
| 712 | volatile scc_t *scp; |
| 713 | volatile scc_uart_t *sup; |
| 714 | |
| 715 | pr_debug("CPM uart[%d]:init_scc\n", pinfo->port.line); |
| 716 | |
| 717 | scp = pinfo->sccp; |
| 718 | sup = pinfo->sccup; |
| 719 | |
| 720 | /* Store address */ |
| 721 | pinfo->sccup->scc_genscc.scc_rbase = (unsigned char *)pinfo->rx_bd_base - DPRAM_BASE; |
| 722 | pinfo->sccup->scc_genscc.scc_tbase = (unsigned char *)pinfo->tx_bd_base - DPRAM_BASE; |
| 723 | |
| 724 | /* Set up the uart parameters in the |
| 725 | * parameter ram. |
| 726 | */ |
| 727 | |
| 728 | cpm_set_scc_fcr(sup); |
| 729 | |
| 730 | sup->scc_genscc.scc_mrblr = pinfo->rx_fifosize; |
| 731 | sup->scc_maxidl = pinfo->rx_fifosize; |
| 732 | sup->scc_brkcr = 1; |
| 733 | sup->scc_parec = 0; |
| 734 | sup->scc_frmec = 0; |
| 735 | sup->scc_nosec = 0; |
| 736 | sup->scc_brkec = 0; |
| 737 | sup->scc_uaddr1 = 0; |
| 738 | sup->scc_uaddr2 = 0; |
| 739 | sup->scc_toseq = 0; |
| 740 | sup->scc_char1 = 0x8000; |
| 741 | sup->scc_char2 = 0x8000; |
| 742 | sup->scc_char3 = 0x8000; |
| 743 | sup->scc_char4 = 0x8000; |
| 744 | sup->scc_char5 = 0x8000; |
| 745 | sup->scc_char6 = 0x8000; |
| 746 | sup->scc_char7 = 0x8000; |
| 747 | sup->scc_char8 = 0x8000; |
| 748 | sup->scc_rccm = 0xc0ff; |
| 749 | |
| 750 | /* Send the CPM an initialize command. |
| 751 | */ |
| 752 | cpm_line_cr_cmd(line, CPM_CR_INIT_TRX); |
| 753 | |
| 754 | /* Set UART mode, 8 bit, no parity, one stop. |
| 755 | * Enable receive and transmit. |
| 756 | */ |
| 757 | scp->scc_gsmrh = 0; |
| 758 | scp->scc_gsmrl = |
| 759 | (SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16); |
| 760 | |
| 761 | /* Enable rx interrupts and clear all pending events. */ |
| 762 | scp->scc_sccm = 0; |
| 763 | scp->scc_scce = 0xffff; |
| 764 | scp->scc_dsr = 0x7e7e; |
| 765 | scp->scc_psmr = 0x3000; |
| 766 | |
| 767 | scp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT); |
| 768 | } |
| 769 | |
| 770 | static void cpm_uart_init_smc(struct uart_cpm_port *pinfo) |
| 771 | { |
| 772 | int line = pinfo - cpm_uart_ports; |
| 773 | volatile smc_t *sp; |
| 774 | volatile smc_uart_t *up; |
| 775 | |
| 776 | pr_debug("CPM uart[%d]:init_smc\n", pinfo->port.line); |
| 777 | |
| 778 | sp = pinfo->smcp; |
| 779 | up = pinfo->smcup; |
| 780 | |
| 781 | /* Store address */ |
| 782 | pinfo->smcup->smc_rbase = (u_char *)pinfo->rx_bd_base - DPRAM_BASE; |
| 783 | pinfo->smcup->smc_tbase = (u_char *)pinfo->tx_bd_base - DPRAM_BASE; |
| 784 | |
| 785 | /* |
| 786 | * In case SMC1 is being relocated... |
| 787 | */ |
| 788 | #if defined (CONFIG_I2C_SPI_SMC1_UCODE_PATCH) |
| 789 | up->smc_rbptr = pinfo->smcup->smc_rbase; |
| 790 | up->smc_tbptr = pinfo->smcup->smc_tbase; |
| 791 | up->smc_rstate = 0; |
| 792 | up->smc_tstate = 0; |
| 793 | up->smc_brkcr = 1; /* number of break chars */ |
| 794 | up->smc_brkec = 0; |
| 795 | #endif |
| 796 | |
| 797 | /* Set up the uart parameters in the |
| 798 | * parameter ram. |
| 799 | */ |
| 800 | cpm_set_smc_fcr(up); |
| 801 | |
| 802 | /* Using idle charater time requires some additional tuning. */ |
| 803 | up->smc_mrblr = pinfo->rx_fifosize; |
| 804 | up->smc_maxidl = pinfo->rx_fifosize; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 805 | up->smc_brklen = 0; |
| 806 | up->smc_brkec = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | up->smc_brkcr = 1; |
| 808 | |
| 809 | cpm_line_cr_cmd(line, CPM_CR_INIT_TRX); |
| 810 | |
| 811 | /* Set UART mode, 8 bit, no parity, one stop. |
| 812 | * Enable receive and transmit. |
| 813 | */ |
| 814 | sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART; |
| 815 | |
| 816 | /* Enable only rx interrupts clear all pending events. */ |
| 817 | sp->smc_smcm = 0; |
| 818 | sp->smc_smce = 0xff; |
| 819 | |
| 820 | sp->smc_smcmr |= (SMCMR_REN | SMCMR_TEN); |
| 821 | } |
| 822 | |
| 823 | /* |
| 824 | * Initialize port. This is called from early_console stuff |
| 825 | * so we have to be careful here ! |
| 826 | */ |
| 827 | static int cpm_uart_request_port(struct uart_port *port) |
| 828 | { |
| 829 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 830 | int ret; |
| 831 | |
| 832 | pr_debug("CPM uart[%d]:request port\n", port->line); |
| 833 | |
| 834 | if (pinfo->flags & FLAG_CONSOLE) |
| 835 | return 0; |
| 836 | |
| 837 | /* |
| 838 | * Setup any port IO, connect any baud rate generators, |
| 839 | * etc. This is expected to be handled by board |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 840 | * dependant code |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | */ |
| 842 | if (pinfo->set_lineif) |
| 843 | pinfo->set_lineif(pinfo); |
| 844 | |
| 845 | if (IS_SMC(pinfo)) { |
| 846 | pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX); |
| 847 | pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN); |
| 848 | } else { |
| 849 | pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX); |
| 850 | pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); |
| 851 | } |
| 852 | |
| 853 | ret = cpm_uart_allocbuf(pinfo, 0); |
| 854 | |
| 855 | if (ret) |
| 856 | return ret; |
| 857 | |
| 858 | cpm_uart_initbd(pinfo); |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 859 | if (IS_SMC(pinfo)) |
| 860 | cpm_uart_init_smc(pinfo); |
| 861 | else |
| 862 | cpm_uart_init_scc(pinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
| 864 | return 0; |
| 865 | } |
| 866 | |
| 867 | static void cpm_uart_release_port(struct uart_port *port) |
| 868 | { |
| 869 | struct uart_cpm_port *pinfo = (struct uart_cpm_port *)port; |
| 870 | |
| 871 | if (!(pinfo->flags & FLAG_CONSOLE)) |
| 872 | cpm_uart_freebuf(pinfo); |
| 873 | } |
| 874 | |
| 875 | /* |
| 876 | * Configure/autoconfigure the port. |
| 877 | */ |
| 878 | static void cpm_uart_config_port(struct uart_port *port, int flags) |
| 879 | { |
| 880 | pr_debug("CPM uart[%d]:config_port\n", port->line); |
| 881 | |
| 882 | if (flags & UART_CONFIG_TYPE) { |
| 883 | port->type = PORT_CPM; |
| 884 | cpm_uart_request_port(port); |
| 885 | } |
| 886 | } |
| 887 | static struct uart_ops cpm_uart_pops = { |
| 888 | .tx_empty = cpm_uart_tx_empty, |
| 889 | .set_mctrl = cpm_uart_set_mctrl, |
| 890 | .get_mctrl = cpm_uart_get_mctrl, |
| 891 | .stop_tx = cpm_uart_stop_tx, |
| 892 | .start_tx = cpm_uart_start_tx, |
| 893 | .stop_rx = cpm_uart_stop_rx, |
| 894 | .enable_ms = cpm_uart_enable_ms, |
| 895 | .break_ctl = cpm_uart_break_ctl, |
| 896 | .startup = cpm_uart_startup, |
| 897 | .shutdown = cpm_uart_shutdown, |
| 898 | .set_termios = cpm_uart_set_termios, |
| 899 | .type = cpm_uart_type, |
| 900 | .release_port = cpm_uart_release_port, |
| 901 | .request_port = cpm_uart_request_port, |
| 902 | .config_port = cpm_uart_config_port, |
| 903 | .verify_port = cpm_uart_verify_port, |
| 904 | }; |
| 905 | |
| 906 | struct uart_cpm_port cpm_uart_ports[UART_NR] = { |
| 907 | [UART_SMC1] = { |
| 908 | .port = { |
| 909 | .irq = SMC1_IRQ, |
| 910 | .ops = &cpm_uart_pops, |
| 911 | .iotype = SERIAL_IO_MEM, |
| 912 | .lock = SPIN_LOCK_UNLOCKED, |
| 913 | }, |
| 914 | .flags = FLAG_SMC, |
| 915 | .tx_nrfifos = TX_NUM_FIFO, |
| 916 | .tx_fifosize = TX_BUF_SIZE, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 917 | .rx_nrfifos = RX_NUM_FIFO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | .rx_fifosize = RX_BUF_SIZE, |
| 919 | .set_lineif = smc1_lineif, |
| 920 | }, |
| 921 | [UART_SMC2] = { |
| 922 | .port = { |
| 923 | .irq = SMC2_IRQ, |
| 924 | .ops = &cpm_uart_pops, |
| 925 | .iotype = SERIAL_IO_MEM, |
| 926 | .lock = SPIN_LOCK_UNLOCKED, |
| 927 | }, |
| 928 | .flags = FLAG_SMC, |
| 929 | .tx_nrfifos = TX_NUM_FIFO, |
| 930 | .tx_fifosize = TX_BUF_SIZE, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 931 | .rx_nrfifos = RX_NUM_FIFO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | .rx_fifosize = RX_BUF_SIZE, |
| 933 | .set_lineif = smc2_lineif, |
| 934 | #ifdef CONFIG_SERIAL_CPM_ALT_SMC2 |
| 935 | .is_portb = 1, |
| 936 | #endif |
| 937 | }, |
| 938 | [UART_SCC1] = { |
| 939 | .port = { |
| 940 | .irq = SCC1_IRQ, |
| 941 | .ops = &cpm_uart_pops, |
| 942 | .iotype = SERIAL_IO_MEM, |
| 943 | .lock = SPIN_LOCK_UNLOCKED, |
| 944 | }, |
| 945 | .tx_nrfifos = TX_NUM_FIFO, |
| 946 | .tx_fifosize = TX_BUF_SIZE, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 947 | .rx_nrfifos = RX_NUM_FIFO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | .rx_fifosize = RX_BUF_SIZE, |
| 949 | .set_lineif = scc1_lineif, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 950 | .wait_closing = SCC_WAIT_CLOSING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | }, |
| 952 | [UART_SCC2] = { |
| 953 | .port = { |
| 954 | .irq = SCC2_IRQ, |
| 955 | .ops = &cpm_uart_pops, |
| 956 | .iotype = SERIAL_IO_MEM, |
| 957 | .lock = SPIN_LOCK_UNLOCKED, |
| 958 | }, |
| 959 | .tx_nrfifos = TX_NUM_FIFO, |
| 960 | .tx_fifosize = TX_BUF_SIZE, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 961 | .rx_nrfifos = RX_NUM_FIFO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | .rx_fifosize = RX_BUF_SIZE, |
| 963 | .set_lineif = scc2_lineif, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 964 | .wait_closing = SCC_WAIT_CLOSING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | }, |
| 966 | [UART_SCC3] = { |
| 967 | .port = { |
| 968 | .irq = SCC3_IRQ, |
| 969 | .ops = &cpm_uart_pops, |
| 970 | .iotype = SERIAL_IO_MEM, |
| 971 | .lock = SPIN_LOCK_UNLOCKED, |
| 972 | }, |
| 973 | .tx_nrfifos = TX_NUM_FIFO, |
| 974 | .tx_fifosize = TX_BUF_SIZE, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 975 | .rx_nrfifos = RX_NUM_FIFO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | .rx_fifosize = RX_BUF_SIZE, |
| 977 | .set_lineif = scc3_lineif, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 978 | .wait_closing = SCC_WAIT_CLOSING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | }, |
| 980 | [UART_SCC4] = { |
| 981 | .port = { |
| 982 | .irq = SCC4_IRQ, |
| 983 | .ops = &cpm_uart_pops, |
| 984 | .iotype = SERIAL_IO_MEM, |
| 985 | .lock = SPIN_LOCK_UNLOCKED, |
| 986 | }, |
| 987 | .tx_nrfifos = TX_NUM_FIFO, |
| 988 | .tx_fifosize = TX_BUF_SIZE, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 989 | .rx_nrfifos = RX_NUM_FIFO, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | .rx_fifosize = RX_BUF_SIZE, |
| 991 | .set_lineif = scc4_lineif, |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 992 | .wait_closing = SCC_WAIT_CLOSING, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | }, |
| 994 | }; |
| 995 | |
| 996 | #ifdef CONFIG_SERIAL_CPM_CONSOLE |
| 997 | /* |
| 998 | * Print a string to the serial port trying not to disturb |
| 999 | * any possible real use of the port... |
| 1000 | * |
| 1001 | * Note that this is called with interrupts already disabled |
| 1002 | */ |
| 1003 | static void cpm_uart_console_write(struct console *co, const char *s, |
| 1004 | u_int count) |
| 1005 | { |
| 1006 | struct uart_cpm_port *pinfo = |
| 1007 | &cpm_uart_ports[cpm_uart_port_map[co->index]]; |
| 1008 | unsigned int i; |
| 1009 | volatile cbd_t *bdp, *bdbase; |
| 1010 | volatile unsigned char *cp; |
| 1011 | |
| 1012 | /* Get the address of the host memory buffer. |
| 1013 | */ |
| 1014 | bdp = pinfo->tx_cur; |
| 1015 | bdbase = pinfo->tx_bd_base; |
| 1016 | |
| 1017 | /* |
| 1018 | * Now, do each character. This is not as bad as it looks |
| 1019 | * since this is a holding FIFO and not a transmitting FIFO. |
| 1020 | * We could add the complexity of filling the entire transmit |
| 1021 | * buffer, but we would just wait longer between accesses...... |
| 1022 | */ |
| 1023 | for (i = 0; i < count; i++, s++) { |
| 1024 | /* Wait for transmitter fifo to empty. |
| 1025 | * Ready indicates output is ready, and xmt is doing |
| 1026 | * that, not that it is ready for us to send. |
| 1027 | */ |
| 1028 | while ((bdp->cbd_sc & BD_SC_READY) != 0) |
| 1029 | ; |
| 1030 | |
| 1031 | /* Send the character out. |
| 1032 | * If the buffer address is in the CPM DPRAM, don't |
| 1033 | * convert it. |
| 1034 | */ |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 1035 | cp = cpm2cpu_addr(bdp->cbd_bufaddr); |
| 1036 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | *cp = *s; |
| 1038 | |
| 1039 | bdp->cbd_datlen = 1; |
| 1040 | bdp->cbd_sc |= BD_SC_READY; |
| 1041 | |
| 1042 | if (bdp->cbd_sc & BD_SC_WRAP) |
| 1043 | bdp = bdbase; |
| 1044 | else |
| 1045 | bdp++; |
| 1046 | |
| 1047 | /* if a LF, also do CR... */ |
| 1048 | if (*s == 10) { |
| 1049 | while ((bdp->cbd_sc & BD_SC_READY) != 0) |
| 1050 | ; |
| 1051 | |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 1052 | cp = cpm2cpu_addr(bdp->cbd_bufaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | |
| 1054 | *cp = 13; |
| 1055 | bdp->cbd_datlen = 1; |
| 1056 | bdp->cbd_sc |= BD_SC_READY; |
| 1057 | |
| 1058 | if (bdp->cbd_sc & BD_SC_WRAP) |
| 1059 | bdp = bdbase; |
| 1060 | else |
| 1061 | bdp++; |
| 1062 | } |
| 1063 | } |
| 1064 | |
| 1065 | /* |
| 1066 | * Finally, Wait for transmitter & holding register to empty |
| 1067 | * and restore the IER |
| 1068 | */ |
| 1069 | while ((bdp->cbd_sc & BD_SC_READY) != 0) |
| 1070 | ; |
| 1071 | |
| 1072 | pinfo->tx_cur = (volatile cbd_t *) bdp; |
| 1073 | } |
| 1074 | |
| 1075 | /* |
| 1076 | * Setup console. Be careful is called early ! |
| 1077 | */ |
| 1078 | static int __init cpm_uart_console_setup(struct console *co, char *options) |
| 1079 | { |
| 1080 | struct uart_port *port; |
| 1081 | struct uart_cpm_port *pinfo; |
| 1082 | int baud = 38400; |
| 1083 | int bits = 8; |
| 1084 | int parity = 'n'; |
| 1085 | int flow = 'n'; |
| 1086 | int ret; |
| 1087 | |
| 1088 | port = |
| 1089 | (struct uart_port *)&cpm_uart_ports[cpm_uart_port_map[co->index]]; |
| 1090 | pinfo = (struct uart_cpm_port *)port; |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 1091 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | pinfo->flags |= FLAG_CONSOLE; |
| 1093 | |
| 1094 | if (options) { |
| 1095 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 1096 | } else { |
| 1097 | bd_t *bd = (bd_t *) __res; |
| 1098 | |
| 1099 | if (bd->bi_baudrate) |
| 1100 | baud = bd->bi_baudrate; |
| 1101 | else |
| 1102 | baud = 9600; |
| 1103 | } |
| 1104 | |
| 1105 | /* |
| 1106 | * Setup any port IO, connect any baud rate generators, |
| 1107 | * etc. This is expected to be handled by board |
Kumar Gala | 311c462 | 2005-08-09 10:08:00 -0700 | [diff] [blame] | 1108 | * dependant code |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | */ |
| 1110 | if (pinfo->set_lineif) |
| 1111 | pinfo->set_lineif(pinfo); |
| 1112 | |
| 1113 | if (IS_SMC(pinfo)) { |
| 1114 | pinfo->smcp->smc_smcm &= ~(SMCM_RX | SMCM_TX); |
| 1115 | pinfo->smcp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN); |
| 1116 | } else { |
| 1117 | pinfo->sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX); |
| 1118 | pinfo->sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT); |
| 1119 | } |
| 1120 | |
| 1121 | ret = cpm_uart_allocbuf(pinfo, 1); |
| 1122 | |
| 1123 | if (ret) |
| 1124 | return ret; |
| 1125 | |
| 1126 | cpm_uart_initbd(pinfo); |
| 1127 | |
| 1128 | if (IS_SMC(pinfo)) |
| 1129 | cpm_uart_init_smc(pinfo); |
| 1130 | else |
| 1131 | cpm_uart_init_scc(pinfo); |
| 1132 | |
| 1133 | uart_set_options(port, co, baud, parity, bits, flow); |
| 1134 | |
| 1135 | return 0; |
| 1136 | } |
| 1137 | |
Kumar Gala | 36d2f5a | 2005-08-09 10:08:02 -0700 | [diff] [blame] | 1138 | static struct uart_driver cpm_reg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | static struct console cpm_scc_uart_console = { |
Kumar Gala | 36d2f5a | 2005-08-09 10:08:02 -0700 | [diff] [blame] | 1140 | .name = "ttyCPM", |
| 1141 | .write = cpm_uart_console_write, |
| 1142 | .device = uart_console_device, |
| 1143 | .setup = cpm_uart_console_setup, |
| 1144 | .flags = CON_PRINTBUFFER, |
| 1145 | .index = -1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | .data = &cpm_reg, |
| 1147 | }; |
| 1148 | |
| 1149 | int __init cpm_uart_console_init(void) |
| 1150 | { |
| 1151 | int ret = cpm_uart_init_portdesc(); |
| 1152 | |
| 1153 | if (!ret) |
| 1154 | register_console(&cpm_scc_uart_console); |
| 1155 | return ret; |
| 1156 | } |
| 1157 | |
| 1158 | console_initcall(cpm_uart_console_init); |
| 1159 | |
| 1160 | #define CPM_UART_CONSOLE &cpm_scc_uart_console |
| 1161 | #else |
| 1162 | #define CPM_UART_CONSOLE NULL |
| 1163 | #endif |
| 1164 | |
| 1165 | static struct uart_driver cpm_reg = { |
| 1166 | .owner = THIS_MODULE, |
| 1167 | .driver_name = "ttyCPM", |
| 1168 | .dev_name = "ttyCPM", |
| 1169 | .major = SERIAL_CPM_MAJOR, |
| 1170 | .minor = SERIAL_CPM_MINOR, |
| 1171 | .cons = CPM_UART_CONSOLE, |
| 1172 | }; |
| 1173 | |
| 1174 | static int __init cpm_uart_init(void) |
| 1175 | { |
| 1176 | int ret, i; |
| 1177 | |
| 1178 | printk(KERN_INFO "Serial: CPM driver $Revision: 0.01 $\n"); |
| 1179 | |
| 1180 | #ifndef CONFIG_SERIAL_CPM_CONSOLE |
| 1181 | ret = cpm_uart_init_portdesc(); |
| 1182 | if (ret) |
| 1183 | return ret; |
| 1184 | #endif |
| 1185 | |
| 1186 | cpm_reg.nr = cpm_uart_nr; |
| 1187 | ret = uart_register_driver(&cpm_reg); |
| 1188 | |
| 1189 | if (ret) |
| 1190 | return ret; |
| 1191 | |
| 1192 | for (i = 0; i < cpm_uart_nr; i++) { |
| 1193 | int con = cpm_uart_port_map[i]; |
| 1194 | cpm_uart_ports[con].port.line = i; |
| 1195 | cpm_uart_ports[con].port.flags = UPF_BOOT_AUTOCONF; |
| 1196 | uart_add_one_port(&cpm_reg, &cpm_uart_ports[con].port); |
| 1197 | } |
| 1198 | |
| 1199 | return ret; |
| 1200 | } |
| 1201 | |
| 1202 | static void __exit cpm_uart_exit(void) |
| 1203 | { |
| 1204 | int i; |
| 1205 | |
| 1206 | for (i = 0; i < cpm_uart_nr; i++) { |
| 1207 | int con = cpm_uart_port_map[i]; |
| 1208 | uart_remove_one_port(&cpm_reg, &cpm_uart_ports[con].port); |
| 1209 | } |
| 1210 | |
| 1211 | uart_unregister_driver(&cpm_reg); |
| 1212 | } |
| 1213 | |
| 1214 | module_init(cpm_uart_init); |
| 1215 | module_exit(cpm_uart_exit); |
| 1216 | |
| 1217 | MODULE_AUTHOR("Kumar Gala/Antoniou Pantelis"); |
| 1218 | MODULE_DESCRIPTION("CPM SCC/SMC port driver $Revision: 0.01 $"); |
| 1219 | MODULE_LICENSE("GPL"); |
| 1220 | MODULE_ALIAS_CHARDEV(SERIAL_CPM_MAJOR, SERIAL_CPM_MINOR); |