Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 1 | /****************************************************************************/ |
| 2 | |
| 3 | /* |
| 4 | * mcf.c -- Freescale ColdFire UART driver |
| 5 | * |
| 6 | * (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | /****************************************************************************/ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/interrupt.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/console.h> |
| 21 | #include <linux/tty.h> |
| 22 | #include <linux/tty_flip.h> |
| 23 | #include <linux/serial.h> |
| 24 | #include <linux/serial_core.h> |
| 25 | #include <linux/io.h> |
Quoc-Viet Nguyen | 496c907 | 2013-01-15 09:32:53 +1000 | [diff] [blame] | 26 | #include <linux/uaccess.h> |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 27 | #include <asm/coldfire.h> |
| 28 | #include <asm/mcfsim.h> |
| 29 | #include <asm/mcfuart.h> |
| 30 | #include <asm/nettel.h> |
| 31 | |
| 32 | /****************************************************************************/ |
| 33 | |
| 34 | /* |
| 35 | * Some boards implement the DTR/DCD lines using GPIO lines, most |
| 36 | * don't. Dummy out the access macros for those that don't. Those |
| 37 | * that do should define these macros somewhere in there board |
| 38 | * specific inlude files. |
| 39 | */ |
| 40 | #if !defined(mcf_getppdcd) |
| 41 | #define mcf_getppdcd(p) (1) |
| 42 | #endif |
| 43 | #if !defined(mcf_getppdtr) |
| 44 | #define mcf_getppdtr(p) (1) |
| 45 | #endif |
| 46 | #if !defined(mcf_setppdtr) |
| 47 | #define mcf_setppdtr(p, v) do { } while (0) |
| 48 | #endif |
| 49 | |
| 50 | /****************************************************************************/ |
| 51 | |
| 52 | /* |
| 53 | * Local per-uart structure. |
| 54 | */ |
| 55 | struct mcf_uart { |
| 56 | struct uart_port port; |
| 57 | unsigned int sigs; /* Local copy of line sigs */ |
| 58 | unsigned char imr; /* Local IMR mirror */ |
Quoc-Viet Nguyen | 496c907 | 2013-01-15 09:32:53 +1000 | [diff] [blame] | 59 | struct serial_rs485 rs485; /* RS485 settings */ |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 60 | }; |
| 61 | |
| 62 | /****************************************************************************/ |
| 63 | |
| 64 | static unsigned int mcf_tx_empty(struct uart_port *port) |
| 65 | { |
| 66 | return (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXEMPTY) ? |
| 67 | TIOCSER_TEMT : 0; |
| 68 | } |
| 69 | |
| 70 | /****************************************************************************/ |
| 71 | |
| 72 | static unsigned int mcf_get_mctrl(struct uart_port *port) |
| 73 | { |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 74 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 75 | unsigned int sigs; |
| 76 | |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 77 | sigs = (readb(port->membase + MCFUART_UIPR) & MCFUART_UIPR_CTS) ? |
| 78 | 0 : TIOCM_CTS; |
| 79 | sigs |= (pp->sigs & TIOCM_RTS); |
| 80 | sigs |= (mcf_getppdcd(port->line) ? TIOCM_CD : 0); |
| 81 | sigs |= (mcf_getppdtr(port->line) ? TIOCM_DTR : 0); |
Yury Georgievskiy | 0ac8382 | 2010-07-20 15:26:50 -0700 | [diff] [blame] | 82 | |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 83 | return sigs; |
| 84 | } |
| 85 | |
| 86 | /****************************************************************************/ |
| 87 | |
| 88 | static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs) |
| 89 | { |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 90 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 91 | |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 92 | pp->sigs = sigs; |
| 93 | mcf_setppdtr(port->line, (sigs & TIOCM_DTR)); |
| 94 | if (sigs & TIOCM_RTS) |
| 95 | writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1); |
| 96 | else |
| 97 | writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP0); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | /****************************************************************************/ |
| 101 | |
| 102 | static void mcf_start_tx(struct uart_port *port) |
| 103 | { |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 104 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 105 | |
Quoc-Viet Nguyen | 496c907 | 2013-01-15 09:32:53 +1000 | [diff] [blame] | 106 | if (pp->rs485.flags & SER_RS485_ENABLED) { |
| 107 | /* Enable Transmitter */ |
| 108 | writeb(MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR); |
| 109 | /* Manually assert RTS */ |
| 110 | writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1); |
| 111 | } |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 112 | pp->imr |= MCFUART_UIR_TXREADY; |
| 113 | writeb(pp->imr, port->membase + MCFUART_UIMR); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /****************************************************************************/ |
| 117 | |
| 118 | static void mcf_stop_tx(struct uart_port *port) |
| 119 | { |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 120 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 121 | |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 122 | pp->imr &= ~MCFUART_UIR_TXREADY; |
| 123 | writeb(pp->imr, port->membase + MCFUART_UIMR); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | /****************************************************************************/ |
| 127 | |
| 128 | static void mcf_stop_rx(struct uart_port *port) |
| 129 | { |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 130 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 131 | |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 132 | pp->imr &= ~MCFUART_UIR_RXREADY; |
| 133 | writeb(pp->imr, port->membase + MCFUART_UIMR); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | /****************************************************************************/ |
| 137 | |
| 138 | static void mcf_break_ctl(struct uart_port *port, int break_state) |
| 139 | { |
| 140 | unsigned long flags; |
| 141 | |
| 142 | spin_lock_irqsave(&port->lock, flags); |
| 143 | if (break_state == -1) |
| 144 | writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR); |
| 145 | else |
| 146 | writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR); |
| 147 | spin_unlock_irqrestore(&port->lock, flags); |
| 148 | } |
| 149 | |
| 150 | /****************************************************************************/ |
| 151 | |
| 152 | static void mcf_enable_ms(struct uart_port *port) |
| 153 | { |
| 154 | } |
| 155 | |
| 156 | /****************************************************************************/ |
| 157 | |
| 158 | static int mcf_startup(struct uart_port *port) |
| 159 | { |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 160 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 161 | unsigned long flags; |
| 162 | |
| 163 | spin_lock_irqsave(&port->lock, flags); |
| 164 | |
| 165 | /* Reset UART, get it into known state... */ |
| 166 | writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR); |
| 167 | writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR); |
| 168 | |
| 169 | /* Enable the UART transmitter and receiver */ |
| 170 | writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE, |
| 171 | port->membase + MCFUART_UCR); |
| 172 | |
| 173 | /* Enable RX interrupts now */ |
| 174 | pp->imr = MCFUART_UIR_RXREADY; |
| 175 | writeb(pp->imr, port->membase + MCFUART_UIMR); |
| 176 | |
| 177 | spin_unlock_irqrestore(&port->lock, flags); |
| 178 | |
| 179 | return 0; |
| 180 | } |
| 181 | |
| 182 | /****************************************************************************/ |
| 183 | |
| 184 | static void mcf_shutdown(struct uart_port *port) |
| 185 | { |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 186 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 187 | unsigned long flags; |
| 188 | |
| 189 | spin_lock_irqsave(&port->lock, flags); |
| 190 | |
| 191 | /* Disable all interrupts now */ |
| 192 | pp->imr = 0; |
| 193 | writeb(pp->imr, port->membase + MCFUART_UIMR); |
| 194 | |
| 195 | /* Disable UART transmitter and receiver */ |
| 196 | writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR); |
| 197 | writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR); |
| 198 | |
| 199 | spin_unlock_irqrestore(&port->lock, flags); |
| 200 | } |
| 201 | |
| 202 | /****************************************************************************/ |
| 203 | |
| 204 | static void mcf_set_termios(struct uart_port *port, struct ktermios *termios, |
| 205 | struct ktermios *old) |
| 206 | { |
Quoc-Viet Nguyen | 496c907 | 2013-01-15 09:32:53 +1000 | [diff] [blame] | 207 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 208 | unsigned long flags; |
| 209 | unsigned int baud, baudclk; |
John Adamson | 26a4bc6 | 2008-08-22 16:43:49 +1000 | [diff] [blame] | 210 | #if defined(CONFIG_M5272) |
| 211 | unsigned int baudfr; |
| 212 | #endif |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 213 | unsigned char mr1, mr2; |
| 214 | |
| 215 | baud = uart_get_baud_rate(port, termios, old, 0, 230400); |
John Adamson | 26a4bc6 | 2008-08-22 16:43:49 +1000 | [diff] [blame] | 216 | #if defined(CONFIG_M5272) |
| 217 | baudclk = (MCF_BUSCLK / baud) / 32; |
| 218 | baudfr = (((MCF_BUSCLK / baud) + 1) / 2) % 16; |
| 219 | #else |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 220 | baudclk = ((MCF_BUSCLK / baud) + 16) / 32; |
John Adamson | 26a4bc6 | 2008-08-22 16:43:49 +1000 | [diff] [blame] | 221 | #endif |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 222 | |
| 223 | mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR; |
| 224 | mr2 = 0; |
| 225 | |
| 226 | switch (termios->c_cflag & CSIZE) { |
| 227 | case CS5: mr1 |= MCFUART_MR1_CS5; break; |
| 228 | case CS6: mr1 |= MCFUART_MR1_CS6; break; |
| 229 | case CS7: mr1 |= MCFUART_MR1_CS7; break; |
| 230 | case CS8: |
| 231 | default: mr1 |= MCFUART_MR1_CS8; break; |
| 232 | } |
| 233 | |
| 234 | if (termios->c_cflag & PARENB) { |
| 235 | if (termios->c_cflag & CMSPAR) { |
| 236 | if (termios->c_cflag & PARODD) |
| 237 | mr1 |= MCFUART_MR1_PARITYMARK; |
| 238 | else |
| 239 | mr1 |= MCFUART_MR1_PARITYSPACE; |
| 240 | } else { |
| 241 | if (termios->c_cflag & PARODD) |
| 242 | mr1 |= MCFUART_MR1_PARITYODD; |
| 243 | else |
| 244 | mr1 |= MCFUART_MR1_PARITYEVEN; |
| 245 | } |
| 246 | } else { |
| 247 | mr1 |= MCFUART_MR1_PARITYNONE; |
| 248 | } |
| 249 | |
| 250 | if (termios->c_cflag & CSTOPB) |
| 251 | mr2 |= MCFUART_MR2_STOP2; |
| 252 | else |
| 253 | mr2 |= MCFUART_MR2_STOP1; |
| 254 | |
| 255 | if (termios->c_cflag & CRTSCTS) { |
| 256 | mr1 |= MCFUART_MR1_RXRTS; |
| 257 | mr2 |= MCFUART_MR2_TXCTS; |
| 258 | } |
| 259 | |
Quoc-Viet Nguyen | 496c907 | 2013-01-15 09:32:53 +1000 | [diff] [blame] | 260 | if (pp->rs485.flags & SER_RS485_ENABLED) { |
| 261 | dev_dbg(port->dev, "Setting UART to RS485\n"); |
| 262 | mr2 |= MCFUART_MR2_TXRTS; |
| 263 | } |
| 264 | |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 265 | spin_lock_irqsave(&port->lock, flags); |
Philippe De Muyter | 3732b68f | 2010-04-02 17:56:08 +0200 | [diff] [blame] | 266 | uart_update_timeout(port, termios->c_cflag, baud); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 267 | writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR); |
| 268 | writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR); |
| 269 | writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR); |
| 270 | writeb(mr1, port->membase + MCFUART_UMR); |
| 271 | writeb(mr2, port->membase + MCFUART_UMR); |
| 272 | writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1); |
| 273 | writeb((baudclk & 0xff), port->membase + MCFUART_UBG2); |
John Adamson | 26a4bc6 | 2008-08-22 16:43:49 +1000 | [diff] [blame] | 274 | #if defined(CONFIG_M5272) |
| 275 | writeb((baudfr & 0x0f), port->membase + MCFUART_UFPD); |
| 276 | #endif |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 277 | writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER, |
| 278 | port->membase + MCFUART_UCSR); |
| 279 | writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE, |
| 280 | port->membase + MCFUART_UCR); |
| 281 | spin_unlock_irqrestore(&port->lock, flags); |
| 282 | } |
| 283 | |
| 284 | /****************************************************************************/ |
| 285 | |
| 286 | static void mcf_rx_chars(struct mcf_uart *pp) |
| 287 | { |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 288 | struct uart_port *port = &pp->port; |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 289 | unsigned char status, ch, flag; |
| 290 | |
| 291 | while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) { |
| 292 | ch = readb(port->membase + MCFUART_URB); |
| 293 | flag = TTY_NORMAL; |
| 294 | port->icount.rx++; |
| 295 | |
| 296 | if (status & MCFUART_USR_RXERR) { |
| 297 | writeb(MCFUART_UCR_CMDRESETERR, |
| 298 | port->membase + MCFUART_UCR); |
| 299 | |
| 300 | if (status & MCFUART_USR_RXBREAK) { |
| 301 | port->icount.brk++; |
| 302 | if (uart_handle_break(port)) |
| 303 | continue; |
| 304 | } else if (status & MCFUART_USR_RXPARITY) { |
| 305 | port->icount.parity++; |
| 306 | } else if (status & MCFUART_USR_RXOVERRUN) { |
| 307 | port->icount.overrun++; |
| 308 | } else if (status & MCFUART_USR_RXFRAMING) { |
| 309 | port->icount.frame++; |
| 310 | } |
| 311 | |
| 312 | status &= port->read_status_mask; |
| 313 | |
| 314 | if (status & MCFUART_USR_RXBREAK) |
| 315 | flag = TTY_BREAK; |
| 316 | else if (status & MCFUART_USR_RXPARITY) |
| 317 | flag = TTY_PARITY; |
| 318 | else if (status & MCFUART_USR_RXFRAMING) |
| 319 | flag = TTY_FRAME; |
| 320 | } |
| 321 | |
| 322 | if (uart_handle_sysrq_char(port, ch)) |
| 323 | continue; |
| 324 | uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag); |
| 325 | } |
| 326 | |
Jiri Slaby | 2e124b4 | 2013-01-03 15:53:06 +0100 | [diff] [blame] | 327 | tty_flip_buffer_push(&port->state->port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | /****************************************************************************/ |
| 331 | |
| 332 | static void mcf_tx_chars(struct mcf_uart *pp) |
| 333 | { |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 334 | struct uart_port *port = &pp->port; |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 335 | struct circ_buf *xmit = &port->state->xmit; |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 336 | |
| 337 | if (port->x_char) { |
| 338 | /* Send special char - probably flow control */ |
| 339 | writeb(port->x_char, port->membase + MCFUART_UTB); |
| 340 | port->x_char = 0; |
| 341 | port->icount.tx++; |
| 342 | return; |
| 343 | } |
| 344 | |
| 345 | while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) { |
| 346 | if (xmit->head == xmit->tail) |
| 347 | break; |
| 348 | writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB); |
| 349 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1); |
| 350 | port->icount.tx++; |
| 351 | } |
| 352 | |
| 353 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 354 | uart_write_wakeup(port); |
| 355 | |
| 356 | if (xmit->head == xmit->tail) { |
| 357 | pp->imr &= ~MCFUART_UIR_TXREADY; |
| 358 | writeb(pp->imr, port->membase + MCFUART_UIMR); |
Quoc-Viet Nguyen | 496c907 | 2013-01-15 09:32:53 +1000 | [diff] [blame] | 359 | /* Disable TX to negate RTS automatically */ |
| 360 | if (pp->rs485.flags & SER_RS485_ENABLED) |
| 361 | writeb(MCFUART_UCR_TXDISABLE, |
| 362 | port->membase + MCFUART_UCR); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 363 | } |
| 364 | } |
| 365 | |
| 366 | /****************************************************************************/ |
| 367 | |
| 368 | static irqreturn_t mcf_interrupt(int irq, void *data) |
| 369 | { |
| 370 | struct uart_port *port = data; |
Greg Ungerer | 9f69ba8 | 2008-02-01 17:38:34 +1000 | [diff] [blame] | 371 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 372 | unsigned int isr; |
Yury Georgievskiy | 0ac8382 | 2010-07-20 15:26:50 -0700 | [diff] [blame] | 373 | irqreturn_t ret = IRQ_NONE; |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 374 | |
| 375 | isr = readb(port->membase + MCFUART_UISR) & pp->imr; |
Yury Georgievskiy | 0ac8382 | 2010-07-20 15:26:50 -0700 | [diff] [blame] | 376 | |
| 377 | spin_lock(&port->lock); |
| 378 | if (isr & MCFUART_UIR_RXREADY) { |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 379 | mcf_rx_chars(pp); |
Yury Georgievskiy | 0ac8382 | 2010-07-20 15:26:50 -0700 | [diff] [blame] | 380 | ret = IRQ_HANDLED; |
| 381 | } |
| 382 | if (isr & MCFUART_UIR_TXREADY) { |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 383 | mcf_tx_chars(pp); |
Yury Georgievskiy | 0ac8382 | 2010-07-20 15:26:50 -0700 | [diff] [blame] | 384 | ret = IRQ_HANDLED; |
| 385 | } |
| 386 | spin_unlock(&port->lock); |
| 387 | |
| 388 | return ret; |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | /****************************************************************************/ |
| 392 | |
| 393 | static void mcf_config_port(struct uart_port *port, int flags) |
| 394 | { |
| 395 | port->type = PORT_MCF; |
Philippe De Muyter | 3732b68f | 2010-04-02 17:56:08 +0200 | [diff] [blame] | 396 | port->fifosize = MCFUART_TXFIFOSIZE; |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 397 | |
| 398 | /* Clear mask, so no surprise interrupts. */ |
| 399 | writeb(0, port->membase + MCFUART_UIMR); |
| 400 | |
Yong Zhang | 9cfb5c0 | 2011-09-22 16:59:15 +0800 | [diff] [blame] | 401 | if (request_irq(port->irq, mcf_interrupt, 0, "UART", port)) |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 402 | printk(KERN_ERR "MCF: unable to attach ColdFire UART %d " |
| 403 | "interrupt vector=%d\n", port->line, port->irq); |
| 404 | } |
| 405 | |
| 406 | /****************************************************************************/ |
| 407 | |
| 408 | static const char *mcf_type(struct uart_port *port) |
| 409 | { |
| 410 | return (port->type == PORT_MCF) ? "ColdFire UART" : NULL; |
| 411 | } |
| 412 | |
| 413 | /****************************************************************************/ |
| 414 | |
| 415 | static int mcf_request_port(struct uart_port *port) |
| 416 | { |
| 417 | /* UARTs always present */ |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | /****************************************************************************/ |
| 422 | |
| 423 | static void mcf_release_port(struct uart_port *port) |
| 424 | { |
| 425 | /* Nothing to release... */ |
| 426 | } |
| 427 | |
| 428 | /****************************************************************************/ |
| 429 | |
| 430 | static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 431 | { |
| 432 | if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF)) |
| 433 | return -EINVAL; |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | /****************************************************************************/ |
| 438 | |
Quoc-Viet Nguyen | 496c907 | 2013-01-15 09:32:53 +1000 | [diff] [blame] | 439 | /* Enable or disable the RS485 support */ |
| 440 | static void mcf_config_rs485(struct uart_port *port, struct serial_rs485 *rs485) |
| 441 | { |
| 442 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
| 443 | unsigned long flags; |
| 444 | unsigned char mr1, mr2; |
| 445 | |
| 446 | spin_lock_irqsave(&port->lock, flags); |
| 447 | /* Get mode registers */ |
| 448 | mr1 = readb(port->membase + MCFUART_UMR); |
| 449 | mr2 = readb(port->membase + MCFUART_UMR); |
| 450 | if (rs485->flags & SER_RS485_ENABLED) { |
| 451 | dev_dbg(port->dev, "Setting UART to RS485\n"); |
| 452 | /* Automatically negate RTS after TX completes */ |
| 453 | mr2 |= MCFUART_MR2_TXRTS; |
| 454 | } else { |
| 455 | dev_dbg(port->dev, "Setting UART to RS232\n"); |
| 456 | mr2 &= ~MCFUART_MR2_TXRTS; |
| 457 | } |
| 458 | writeb(mr1, port->membase + MCFUART_UMR); |
| 459 | writeb(mr2, port->membase + MCFUART_UMR); |
| 460 | pp->rs485 = *rs485; |
| 461 | spin_unlock_irqrestore(&port->lock, flags); |
| 462 | } |
| 463 | |
| 464 | static int mcf_ioctl(struct uart_port *port, unsigned int cmd, |
| 465 | unsigned long arg) |
| 466 | { |
| 467 | switch (cmd) { |
| 468 | case TIOCSRS485: { |
| 469 | struct serial_rs485 rs485; |
| 470 | if (copy_from_user(&rs485, (struct serial_rs485 *)arg, |
| 471 | sizeof(struct serial_rs485))) |
| 472 | return -EFAULT; |
| 473 | mcf_config_rs485(port, &rs485); |
| 474 | break; |
| 475 | } |
| 476 | case TIOCGRS485: { |
| 477 | struct mcf_uart *pp = container_of(port, struct mcf_uart, port); |
| 478 | if (copy_to_user((struct serial_rs485 *)arg, &pp->rs485, |
| 479 | sizeof(struct serial_rs485))) |
| 480 | return -EFAULT; |
| 481 | break; |
| 482 | } |
| 483 | default: |
| 484 | return -ENOIOCTLCMD; |
| 485 | } |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | /****************************************************************************/ |
| 490 | |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 491 | /* |
| 492 | * Define the basic serial functions we support. |
| 493 | */ |
Philippe De Muyter | 3732b68f | 2010-04-02 17:56:08 +0200 | [diff] [blame] | 494 | static const struct uart_ops mcf_uart_ops = { |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 495 | .tx_empty = mcf_tx_empty, |
| 496 | .get_mctrl = mcf_get_mctrl, |
| 497 | .set_mctrl = mcf_set_mctrl, |
| 498 | .start_tx = mcf_start_tx, |
| 499 | .stop_tx = mcf_stop_tx, |
| 500 | .stop_rx = mcf_stop_rx, |
| 501 | .enable_ms = mcf_enable_ms, |
| 502 | .break_ctl = mcf_break_ctl, |
| 503 | .startup = mcf_startup, |
| 504 | .shutdown = mcf_shutdown, |
| 505 | .set_termios = mcf_set_termios, |
| 506 | .type = mcf_type, |
| 507 | .request_port = mcf_request_port, |
| 508 | .release_port = mcf_release_port, |
| 509 | .config_port = mcf_config_port, |
| 510 | .verify_port = mcf_verify_port, |
Quoc-Viet Nguyen | 496c907 | 2013-01-15 09:32:53 +1000 | [diff] [blame] | 511 | .ioctl = mcf_ioctl, |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 512 | }; |
| 513 | |
Philippe De Muyter | 2545cf6 | 2010-03-18 11:37:13 +0100 | [diff] [blame] | 514 | static struct mcf_uart mcf_ports[4]; |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 515 | |
Greg Ungerer | 1679196 | 2008-02-04 22:29:56 -0800 | [diff] [blame] | 516 | #define MCF_MAXPORTS ARRAY_SIZE(mcf_ports) |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 517 | |
| 518 | /****************************************************************************/ |
| 519 | #if defined(CONFIG_SERIAL_MCF_CONSOLE) |
| 520 | /****************************************************************************/ |
| 521 | |
| 522 | int __init early_mcf_setup(struct mcf_platform_uart *platp) |
| 523 | { |
| 524 | struct uart_port *port; |
| 525 | int i; |
| 526 | |
| 527 | for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) { |
| 528 | port = &mcf_ports[i].port; |
| 529 | |
| 530 | port->line = i; |
| 531 | port->type = PORT_MCF; |
| 532 | port->mapbase = platp[i].mapbase; |
| 533 | port->membase = (platp[i].membase) ? platp[i].membase : |
| 534 | (unsigned char __iomem *) port->mapbase; |
| 535 | port->iotype = SERIAL_IO_MEM; |
| 536 | port->irq = platp[i].irq; |
| 537 | port->uartclk = MCF_BUSCLK; |
| 538 | port->flags = ASYNC_BOOT_AUTOCONF; |
| 539 | port->ops = &mcf_uart_ops; |
| 540 | } |
| 541 | |
| 542 | return 0; |
| 543 | } |
| 544 | |
| 545 | /****************************************************************************/ |
| 546 | |
| 547 | static void mcf_console_putc(struct console *co, const char c) |
| 548 | { |
| 549 | struct uart_port *port = &(mcf_ports + co->index)->port; |
| 550 | int i; |
| 551 | |
| 552 | for (i = 0; (i < 0x10000); i++) { |
| 553 | if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) |
| 554 | break; |
| 555 | } |
| 556 | writeb(c, port->membase + MCFUART_UTB); |
| 557 | for (i = 0; (i < 0x10000); i++) { |
| 558 | if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) |
| 559 | break; |
| 560 | } |
| 561 | } |
| 562 | |
| 563 | /****************************************************************************/ |
| 564 | |
| 565 | static void mcf_console_write(struct console *co, const char *s, unsigned int count) |
| 566 | { |
| 567 | for (; (count); count--, s++) { |
| 568 | mcf_console_putc(co, *s); |
| 569 | if (*s == '\n') |
| 570 | mcf_console_putc(co, '\r'); |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | /****************************************************************************/ |
| 575 | |
| 576 | static int __init mcf_console_setup(struct console *co, char *options) |
| 577 | { |
| 578 | struct uart_port *port; |
| 579 | int baud = CONFIG_SERIAL_MCF_BAUDRATE; |
| 580 | int bits = 8; |
| 581 | int parity = 'n'; |
| 582 | int flow = 'n'; |
| 583 | |
Len Sorensen | 4330e17 | 2009-02-05 10:11:24 +1000 | [diff] [blame] | 584 | if ((co->index < 0) || (co->index >= MCF_MAXPORTS)) |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 585 | co->index = 0; |
| 586 | port = &mcf_ports[co->index].port; |
| 587 | if (port->membase == 0) |
| 588 | return -ENODEV; |
| 589 | |
| 590 | if (options) |
| 591 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 592 | |
| 593 | return uart_set_options(port, co, baud, parity, bits, flow); |
| 594 | } |
| 595 | |
| 596 | /****************************************************************************/ |
| 597 | |
| 598 | static struct uart_driver mcf_driver; |
| 599 | |
| 600 | static struct console mcf_console = { |
| 601 | .name = "ttyS", |
| 602 | .write = mcf_console_write, |
| 603 | .device = uart_console_device, |
| 604 | .setup = mcf_console_setup, |
| 605 | .flags = CON_PRINTBUFFER, |
| 606 | .index = -1, |
| 607 | .data = &mcf_driver, |
| 608 | }; |
| 609 | |
| 610 | static int __init mcf_console_init(void) |
| 611 | { |
| 612 | register_console(&mcf_console); |
| 613 | return 0; |
| 614 | } |
| 615 | |
| 616 | console_initcall(mcf_console_init); |
| 617 | |
| 618 | #define MCF_CONSOLE &mcf_console |
| 619 | |
| 620 | /****************************************************************************/ |
| 621 | #else |
| 622 | /****************************************************************************/ |
| 623 | |
| 624 | #define MCF_CONSOLE NULL |
| 625 | |
| 626 | /****************************************************************************/ |
| 627 | #endif /* CONFIG_MCF_CONSOLE */ |
| 628 | /****************************************************************************/ |
| 629 | |
| 630 | /* |
| 631 | * Define the mcf UART driver structure. |
| 632 | */ |
| 633 | static struct uart_driver mcf_driver = { |
| 634 | .owner = THIS_MODULE, |
| 635 | .driver_name = "mcf", |
| 636 | .dev_name = "ttyS", |
| 637 | .major = TTY_MAJOR, |
| 638 | .minor = 64, |
| 639 | .nr = MCF_MAXPORTS, |
| 640 | .cons = MCF_CONSOLE, |
| 641 | }; |
| 642 | |
| 643 | /****************************************************************************/ |
| 644 | |
Bill Pemberton | 9671f09 | 2012-11-19 13:21:50 -0500 | [diff] [blame] | 645 | static int mcf_probe(struct platform_device *pdev) |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 646 | { |
| 647 | struct mcf_platform_uart *platp = pdev->dev.platform_data; |
| 648 | struct uart_port *port; |
| 649 | int i; |
| 650 | |
| 651 | for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) { |
| 652 | port = &mcf_ports[i].port; |
| 653 | |
| 654 | port->line = i; |
| 655 | port->type = PORT_MCF; |
| 656 | port->mapbase = platp[i].mapbase; |
| 657 | port->membase = (platp[i].membase) ? platp[i].membase : |
| 658 | (unsigned char __iomem *) platp[i].mapbase; |
| 659 | port->iotype = SERIAL_IO_MEM; |
| 660 | port->irq = platp[i].irq; |
| 661 | port->uartclk = MCF_BUSCLK; |
| 662 | port->ops = &mcf_uart_ops; |
| 663 | port->flags = ASYNC_BOOT_AUTOCONF; |
| 664 | |
| 665 | uart_add_one_port(&mcf_driver, port); |
| 666 | } |
| 667 | |
| 668 | return 0; |
| 669 | } |
| 670 | |
| 671 | /****************************************************************************/ |
| 672 | |
Bill Pemberton | ae8d8a1 | 2012-11-19 13:26:18 -0500 | [diff] [blame] | 673 | static int mcf_remove(struct platform_device *pdev) |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 674 | { |
| 675 | struct uart_port *port; |
| 676 | int i; |
| 677 | |
| 678 | for (i = 0; (i < MCF_MAXPORTS); i++) { |
| 679 | port = &mcf_ports[i].port; |
| 680 | if (port) |
| 681 | uart_remove_one_port(&mcf_driver, port); |
| 682 | } |
| 683 | |
| 684 | return 0; |
| 685 | } |
| 686 | |
| 687 | /****************************************************************************/ |
| 688 | |
| 689 | static struct platform_driver mcf_platform_driver = { |
| 690 | .probe = mcf_probe, |
Bill Pemberton | 2d47b71 | 2012-11-19 13:21:34 -0500 | [diff] [blame] | 691 | .remove = mcf_remove, |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 692 | .driver = { |
| 693 | .name = "mcfuart", |
| 694 | .owner = THIS_MODULE, |
| 695 | }, |
| 696 | }; |
| 697 | |
| 698 | /****************************************************************************/ |
| 699 | |
| 700 | static int __init mcf_init(void) |
| 701 | { |
| 702 | int rc; |
| 703 | |
| 704 | printk("ColdFire internal UART serial driver\n"); |
| 705 | |
| 706 | rc = uart_register_driver(&mcf_driver); |
| 707 | if (rc) |
| 708 | return rc; |
| 709 | rc = platform_driver_register(&mcf_platform_driver); |
Wei Yongjun | 2b35917 | 2013-04-25 09:17:23 +0800 | [diff] [blame^] | 710 | if (rc) { |
| 711 | uart_unregister_driver(&mcf_driver); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 712 | return rc; |
Wei Yongjun | 2b35917 | 2013-04-25 09:17:23 +0800 | [diff] [blame^] | 713 | } |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 714 | return 0; |
| 715 | } |
| 716 | |
| 717 | /****************************************************************************/ |
| 718 | |
| 719 | static void __exit mcf_exit(void) |
| 720 | { |
| 721 | platform_driver_unregister(&mcf_platform_driver); |
| 722 | uart_unregister_driver(&mcf_driver); |
| 723 | } |
| 724 | |
| 725 | /****************************************************************************/ |
| 726 | |
| 727 | module_init(mcf_init); |
| 728 | module_exit(mcf_exit); |
| 729 | |
| 730 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); |
| 731 | MODULE_DESCRIPTION("Freescale ColdFire UART driver"); |
| 732 | MODULE_LICENSE("GPL"); |
Kay Sievers | e169c13 | 2008-04-15 14:34:35 -0700 | [diff] [blame] | 733 | MODULE_ALIAS("platform:mcfuart"); |
Greg Ungerer | 49aa49b | 2007-10-23 14:37:54 +1000 | [diff] [blame] | 734 | |
| 735 | /****************************************************************************/ |