David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1 | /* MN10300 On-chip serial port UART driver |
| 2 | * |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public Licence |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the Licence, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | static const char serial_name[] = "MN10300 Serial driver"; |
| 13 | static const char serial_version[] = "mn10300_serial-1.0"; |
| 14 | static const char serial_revdate[] = "2007-11-06"; |
| 15 | |
| 16 | #if defined(CONFIG_MN10300_TTYSM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 17 | #define SUPPORT_SYSRQ |
| 18 | #endif |
| 19 | |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/serial.h> |
| 22 | #include <linux/circ_buf.h> |
| 23 | #include <linux/errno.h> |
| 24 | #include <linux/signal.h> |
| 25 | #include <linux/sched.h> |
| 26 | #include <linux/timer.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/tty.h> |
| 29 | #include <linux/tty_flip.h> |
| 30 | #include <linux/major.h> |
| 31 | #include <linux/string.h> |
| 32 | #include <linux/ioport.h> |
| 33 | #include <linux/mm.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/init.h> |
| 36 | #include <linux/console.h> |
| 37 | #include <linux/sysrq.h> |
| 38 | |
| 39 | #include <asm/system.h> |
| 40 | #include <asm/io.h> |
| 41 | #include <asm/irq.h> |
| 42 | #include <asm/bitops.h> |
| 43 | #include <asm/serial-regs.h> |
David Howells | 2f2a213 | 2009-04-10 14:33:48 +0100 | [diff] [blame] | 44 | #include <unit/timex.h> |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 45 | #include "mn10300-serial.h" |
| 46 | |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 47 | #ifdef CONFIG_SMP |
| 48 | #undef GxICR |
| 49 | #define GxICR(X) CROSS_GxICR(X, 0) |
| 50 | #endif /* CONFIG_SMP */ |
| 51 | |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 52 | #define kenter(FMT, ...) \ |
| 53 | printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__) |
| 54 | #define _enter(FMT, ...) \ |
| 55 | no_printk(KERN_DEBUG "-->%s(" FMT ")\n", __func__, ##__VA_ARGS__) |
| 56 | #define kdebug(FMT, ...) \ |
| 57 | printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__) |
| 58 | #define _debug(FMT, ...) \ |
| 59 | no_printk(KERN_DEBUG "--- " FMT "\n", ##__VA_ARGS__) |
| 60 | #define kproto(FMT, ...) \ |
| 61 | printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__) |
| 62 | #define _proto(FMT, ...) \ |
| 63 | no_printk(KERN_DEBUG "### MNSERIAL " FMT " ###\n", ##__VA_ARGS__) |
| 64 | |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 65 | #ifndef CODMSB |
| 66 | /* c_cflag bit meaning */ |
| 67 | #define CODMSB 004000000000 /* change Transfer bit-order */ |
| 68 | #endif |
| 69 | |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 70 | #define NR_UARTS 3 |
| 71 | |
| 72 | #ifdef CONFIG_MN10300_TTYSM_CONSOLE |
| 73 | static void mn10300_serial_console_write(struct console *co, |
| 74 | const char *s, unsigned count); |
| 75 | static int __init mn10300_serial_console_setup(struct console *co, |
| 76 | char *options); |
| 77 | |
| 78 | static struct uart_driver mn10300_serial_driver; |
| 79 | static struct console mn10300_serial_console = { |
| 80 | .name = "ttySM", |
| 81 | .write = mn10300_serial_console_write, |
| 82 | .device = uart_console_device, |
| 83 | .setup = mn10300_serial_console_setup, |
| 84 | .flags = CON_PRINTBUFFER, |
| 85 | .index = -1, |
| 86 | .data = &mn10300_serial_driver, |
| 87 | }; |
| 88 | #endif |
| 89 | |
| 90 | static struct uart_driver mn10300_serial_driver = { |
| 91 | .owner = NULL, |
| 92 | .driver_name = "mn10300-serial", |
| 93 | .dev_name = "ttySM", |
| 94 | .major = TTY_MAJOR, |
| 95 | .minor = 128, |
| 96 | .nr = NR_UARTS, |
| 97 | #ifdef CONFIG_MN10300_TTYSM_CONSOLE |
| 98 | .cons = &mn10300_serial_console, |
| 99 | #endif |
| 100 | }; |
| 101 | |
| 102 | static unsigned int mn10300_serial_tx_empty(struct uart_port *); |
| 103 | static void mn10300_serial_set_mctrl(struct uart_port *, unsigned int mctrl); |
| 104 | static unsigned int mn10300_serial_get_mctrl(struct uart_port *); |
| 105 | static void mn10300_serial_stop_tx(struct uart_port *); |
| 106 | static void mn10300_serial_start_tx(struct uart_port *); |
| 107 | static void mn10300_serial_send_xchar(struct uart_port *, char ch); |
| 108 | static void mn10300_serial_stop_rx(struct uart_port *); |
| 109 | static void mn10300_serial_enable_ms(struct uart_port *); |
| 110 | static void mn10300_serial_break_ctl(struct uart_port *, int ctl); |
| 111 | static int mn10300_serial_startup(struct uart_port *); |
| 112 | static void mn10300_serial_shutdown(struct uart_port *); |
| 113 | static void mn10300_serial_set_termios(struct uart_port *, |
| 114 | struct ktermios *new, |
| 115 | struct ktermios *old); |
| 116 | static const char *mn10300_serial_type(struct uart_port *); |
| 117 | static void mn10300_serial_release_port(struct uart_port *); |
| 118 | static int mn10300_serial_request_port(struct uart_port *); |
| 119 | static void mn10300_serial_config_port(struct uart_port *, int); |
| 120 | static int mn10300_serial_verify_port(struct uart_port *, |
| 121 | struct serial_struct *); |
David Howells | 52885b3 | 2011-03-18 16:54:32 +0000 | [diff] [blame] | 122 | #ifdef CONFIG_CONSOLE_POLL |
| 123 | static void mn10300_serial_poll_put_char(struct uart_port *, unsigned char); |
| 124 | static int mn10300_serial_poll_get_char(struct uart_port *); |
| 125 | #endif |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 126 | |
| 127 | static const struct uart_ops mn10300_serial_ops = { |
| 128 | .tx_empty = mn10300_serial_tx_empty, |
| 129 | .set_mctrl = mn10300_serial_set_mctrl, |
| 130 | .get_mctrl = mn10300_serial_get_mctrl, |
| 131 | .stop_tx = mn10300_serial_stop_tx, |
| 132 | .start_tx = mn10300_serial_start_tx, |
| 133 | .send_xchar = mn10300_serial_send_xchar, |
| 134 | .stop_rx = mn10300_serial_stop_rx, |
| 135 | .enable_ms = mn10300_serial_enable_ms, |
| 136 | .break_ctl = mn10300_serial_break_ctl, |
| 137 | .startup = mn10300_serial_startup, |
| 138 | .shutdown = mn10300_serial_shutdown, |
| 139 | .set_termios = mn10300_serial_set_termios, |
| 140 | .type = mn10300_serial_type, |
| 141 | .release_port = mn10300_serial_release_port, |
| 142 | .request_port = mn10300_serial_request_port, |
| 143 | .config_port = mn10300_serial_config_port, |
| 144 | .verify_port = mn10300_serial_verify_port, |
David Howells | 52885b3 | 2011-03-18 16:54:32 +0000 | [diff] [blame] | 145 | #ifdef CONFIG_CONSOLE_POLL |
| 146 | .poll_put_char = mn10300_serial_poll_put_char, |
| 147 | .poll_get_char = mn10300_serial_poll_get_char, |
| 148 | #endif |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 149 | }; |
| 150 | |
| 151 | static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id); |
| 152 | |
| 153 | /* |
| 154 | * the first on-chip serial port: ttySM0 (aka SIF0) |
| 155 | */ |
| 156 | #ifdef CONFIG_MN10300_TTYSM0 |
| 157 | struct mn10300_serial_port mn10300_serial_port_sif0 = { |
| 158 | .uart.ops = &mn10300_serial_ops, |
| 159 | .uart.membase = (void __iomem *) &SC0CTR, |
| 160 | .uart.mapbase = (unsigned long) &SC0CTR, |
| 161 | .uart.iotype = UPIO_MEM, |
| 162 | .uart.irq = 0, |
| 163 | .uart.uartclk = 0, /* MN10300_IOCLK, */ |
| 164 | .uart.fifosize = 1, |
| 165 | .uart.flags = UPF_BOOT_AUTOCONF, |
| 166 | .uart.line = 0, |
| 167 | .uart.type = PORT_MN10300, |
| 168 | .uart.lock = |
| 169 | __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif0.uart.lock), |
| 170 | .name = "ttySM0", |
| 171 | ._iobase = &SC0CTR, |
| 172 | ._control = &SC0CTR, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 173 | ._status = (volatile u8 *)&SC0STR, |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 174 | ._intr = &SC0ICR, |
| 175 | ._rxb = &SC0RXB, |
| 176 | ._txb = &SC0TXB, |
David Howells | a4128b0 | 2010-09-14 17:59:15 +0100 | [diff] [blame] | 177 | .rx_name = "ttySM0:Rx", |
| 178 | .tx_name = "ttySM0:Tx", |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 179 | #if defined(CONFIG_MN10300_TTYSM0_TIMER8) |
David Howells | a4128b0 | 2010-09-14 17:59:15 +0100 | [diff] [blame] | 180 | .tm_name = "ttySM0:Timer8", |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 181 | ._tmxmd = &TM8MD, |
| 182 | ._tmxbr = &TM8BR, |
| 183 | ._tmicr = &TM8ICR, |
| 184 | .tm_irq = TM8IRQ, |
| 185 | .div_timer = MNSCx_DIV_TIMER_16BIT, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 186 | #elif defined(CONFIG_MN10300_TTYSM0_TIMER0) |
| 187 | .tm_name = "ttySM0:Timer0", |
| 188 | ._tmxmd = &TM0MD, |
| 189 | ._tmxbr = (volatile u16 *)&TM0BR, |
| 190 | ._tmicr = &TM0ICR, |
| 191 | .tm_irq = TM0IRQ, |
| 192 | .div_timer = MNSCx_DIV_TIMER_8BIT, |
| 193 | #elif defined(CONFIG_MN10300_TTYSM0_TIMER2) |
David Howells | a4128b0 | 2010-09-14 17:59:15 +0100 | [diff] [blame] | 194 | .tm_name = "ttySM0:Timer2", |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 195 | ._tmxmd = &TM2MD, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 196 | ._tmxbr = (volatile u16 *)&TM2BR, |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 197 | ._tmicr = &TM2ICR, |
| 198 | .tm_irq = TM2IRQ, |
| 199 | .div_timer = MNSCx_DIV_TIMER_8BIT, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 200 | #else |
| 201 | #error "Unknown config for ttySM0" |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 202 | #endif |
| 203 | .rx_irq = SC0RXIRQ, |
| 204 | .tx_irq = SC0TXIRQ, |
| 205 | .rx_icr = &GxICR(SC0RXIRQ), |
| 206 | .tx_icr = &GxICR(SC0TXIRQ), |
| 207 | .clock_src = MNSCx_CLOCK_SRC_IOCLK, |
| 208 | .options = 0, |
| 209 | #ifdef CONFIG_GDBSTUB_ON_TTYSM0 |
| 210 | .gdbstub = 1, |
| 211 | #endif |
| 212 | }; |
| 213 | #endif /* CONFIG_MN10300_TTYSM0 */ |
| 214 | |
| 215 | /* |
| 216 | * the second on-chip serial port: ttySM1 (aka SIF1) |
| 217 | */ |
| 218 | #ifdef CONFIG_MN10300_TTYSM1 |
| 219 | struct mn10300_serial_port mn10300_serial_port_sif1 = { |
| 220 | .uart.ops = &mn10300_serial_ops, |
| 221 | .uart.membase = (void __iomem *) &SC1CTR, |
| 222 | .uart.mapbase = (unsigned long) &SC1CTR, |
| 223 | .uart.iotype = UPIO_MEM, |
| 224 | .uart.irq = 0, |
| 225 | .uart.uartclk = 0, /* MN10300_IOCLK, */ |
| 226 | .uart.fifosize = 1, |
| 227 | .uart.flags = UPF_BOOT_AUTOCONF, |
| 228 | .uart.line = 1, |
| 229 | .uart.type = PORT_MN10300, |
| 230 | .uart.lock = |
| 231 | __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif1.uart.lock), |
| 232 | .name = "ttySM1", |
| 233 | ._iobase = &SC1CTR, |
| 234 | ._control = &SC1CTR, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 235 | ._status = (volatile u8 *)&SC1STR, |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 236 | ._intr = &SC1ICR, |
| 237 | ._rxb = &SC1RXB, |
| 238 | ._txb = &SC1TXB, |
David Howells | a4128b0 | 2010-09-14 17:59:15 +0100 | [diff] [blame] | 239 | .rx_name = "ttySM1:Rx", |
| 240 | .tx_name = "ttySM1:Tx", |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 241 | #if defined(CONFIG_MN10300_TTYSM1_TIMER9) |
David Howells | a4128b0 | 2010-09-14 17:59:15 +0100 | [diff] [blame] | 242 | .tm_name = "ttySM1:Timer9", |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 243 | ._tmxmd = &TM9MD, |
| 244 | ._tmxbr = &TM9BR, |
| 245 | ._tmicr = &TM9ICR, |
| 246 | .tm_irq = TM9IRQ, |
| 247 | .div_timer = MNSCx_DIV_TIMER_16BIT, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 248 | #elif defined(CONFIG_MN10300_TTYSM1_TIMER3) |
David Howells | a4128b0 | 2010-09-14 17:59:15 +0100 | [diff] [blame] | 249 | .tm_name = "ttySM1:Timer3", |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 250 | ._tmxmd = &TM3MD, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 251 | ._tmxbr = (volatile u16 *)&TM3BR, |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 252 | ._tmicr = &TM3ICR, |
| 253 | .tm_irq = TM3IRQ, |
| 254 | .div_timer = MNSCx_DIV_TIMER_8BIT, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 255 | #elif defined(CONFIG_MN10300_TTYSM1_TIMER12) |
| 256 | .tm_name = "ttySM1/Timer12", |
| 257 | ._tmxmd = &TM12MD, |
| 258 | ._tmxbr = &TM12BR, |
| 259 | ._tmicr = &TM12ICR, |
| 260 | .tm_irq = TM12IRQ, |
| 261 | .div_timer = MNSCx_DIV_TIMER_16BIT, |
| 262 | #else |
| 263 | #error "Unknown config for ttySM1" |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 264 | #endif |
| 265 | .rx_irq = SC1RXIRQ, |
| 266 | .tx_irq = SC1TXIRQ, |
| 267 | .rx_icr = &GxICR(SC1RXIRQ), |
| 268 | .tx_icr = &GxICR(SC1TXIRQ), |
| 269 | .clock_src = MNSCx_CLOCK_SRC_IOCLK, |
| 270 | .options = 0, |
| 271 | #ifdef CONFIG_GDBSTUB_ON_TTYSM1 |
| 272 | .gdbstub = 1, |
| 273 | #endif |
| 274 | }; |
| 275 | #endif /* CONFIG_MN10300_TTYSM1 */ |
| 276 | |
| 277 | /* |
| 278 | * the third on-chip serial port: ttySM2 (aka SIF2) |
| 279 | */ |
| 280 | #ifdef CONFIG_MN10300_TTYSM2 |
| 281 | struct mn10300_serial_port mn10300_serial_port_sif2 = { |
| 282 | .uart.ops = &mn10300_serial_ops, |
| 283 | .uart.membase = (void __iomem *) &SC2CTR, |
| 284 | .uart.mapbase = (unsigned long) &SC2CTR, |
| 285 | .uart.iotype = UPIO_MEM, |
| 286 | .uart.irq = 0, |
| 287 | .uart.uartclk = 0, /* MN10300_IOCLK, */ |
| 288 | .uart.fifosize = 1, |
| 289 | .uart.flags = UPF_BOOT_AUTOCONF, |
| 290 | .uart.line = 2, |
| 291 | #ifdef CONFIG_MN10300_TTYSM2_CTS |
| 292 | .uart.type = PORT_MN10300_CTS, |
| 293 | #else |
| 294 | .uart.type = PORT_MN10300, |
| 295 | #endif |
| 296 | .uart.lock = |
| 297 | __SPIN_LOCK_UNLOCKED(mn10300_serial_port_sif2.uart.lock), |
| 298 | .name = "ttySM2", |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 299 | ._iobase = &SC2CTR, |
| 300 | ._control = &SC2CTR, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 301 | ._status = (volatile u8 *)&SC2STR, |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 302 | ._intr = &SC2ICR, |
| 303 | ._rxb = &SC2RXB, |
| 304 | ._txb = &SC2TXB, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 305 | .rx_name = "ttySM2:Rx", |
| 306 | .tx_name = "ttySM2:Tx", |
| 307 | #if defined(CONFIG_MN10300_TTYSM2_TIMER10) |
| 308 | .tm_name = "ttySM2/Timer10", |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 309 | ._tmxmd = &TM10MD, |
| 310 | ._tmxbr = &TM10BR, |
| 311 | ._tmicr = &TM10ICR, |
| 312 | .tm_irq = TM10IRQ, |
| 313 | .div_timer = MNSCx_DIV_TIMER_16BIT, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 314 | #elif defined(CONFIG_MN10300_TTYSM2_TIMER9) |
| 315 | .tm_name = "ttySM2/Timer9", |
| 316 | ._tmxmd = &TM9MD, |
| 317 | ._tmxbr = &TM9BR, |
| 318 | ._tmicr = &TM9ICR, |
| 319 | .tm_irq = TM9IRQ, |
| 320 | .div_timer = MNSCx_DIV_TIMER_16BIT, |
| 321 | #elif defined(CONFIG_MN10300_TTYSM2_TIMER1) |
| 322 | .tm_name = "ttySM2/Timer1", |
| 323 | ._tmxmd = &TM1MD, |
| 324 | ._tmxbr = (volatile u16 *)&TM1BR, |
| 325 | ._tmicr = &TM1ICR, |
| 326 | .tm_irq = TM1IRQ, |
| 327 | .div_timer = MNSCx_DIV_TIMER_8BIT, |
| 328 | #elif defined(CONFIG_MN10300_TTYSM2_TIMER3) |
| 329 | .tm_name = "ttySM2/Timer3", |
| 330 | ._tmxmd = &TM3MD, |
| 331 | ._tmxbr = (volatile u16 *)&TM3BR, |
| 332 | ._tmicr = &TM3ICR, |
| 333 | .tm_irq = TM3IRQ, |
| 334 | .div_timer = MNSCx_DIV_TIMER_8BIT, |
| 335 | #else |
| 336 | #error "Unknown config for ttySM2" |
| 337 | #endif |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 338 | .rx_irq = SC2RXIRQ, |
| 339 | .tx_irq = SC2TXIRQ, |
| 340 | .rx_icr = &GxICR(SC2RXIRQ), |
| 341 | .tx_icr = &GxICR(SC2TXIRQ), |
| 342 | .clock_src = MNSCx_CLOCK_SRC_IOCLK, |
| 343 | #ifdef CONFIG_MN10300_TTYSM2_CTS |
| 344 | .options = MNSCx_OPT_CTS, |
| 345 | #else |
| 346 | .options = 0, |
| 347 | #endif |
| 348 | #ifdef CONFIG_GDBSTUB_ON_TTYSM2 |
| 349 | .gdbstub = 1, |
| 350 | #endif |
| 351 | }; |
| 352 | #endif /* CONFIG_MN10300_TTYSM2 */ |
| 353 | |
| 354 | |
| 355 | /* |
| 356 | * list of available serial ports |
| 357 | */ |
| 358 | struct mn10300_serial_port *mn10300_serial_ports[NR_UARTS + 1] = { |
| 359 | #ifdef CONFIG_MN10300_TTYSM0 |
| 360 | [0] = &mn10300_serial_port_sif0, |
| 361 | #endif |
| 362 | #ifdef CONFIG_MN10300_TTYSM1 |
| 363 | [1] = &mn10300_serial_port_sif1, |
| 364 | #endif |
| 365 | #ifdef CONFIG_MN10300_TTYSM2 |
| 366 | [2] = &mn10300_serial_port_sif2, |
| 367 | #endif |
| 368 | [NR_UARTS] = NULL, |
| 369 | }; |
| 370 | |
| 371 | |
| 372 | /* |
| 373 | * we abuse the serial ports' baud timers' interrupt lines to get the ability |
| 374 | * to deliver interrupts to userspace as we use the ports' interrupt lines to |
| 375 | * do virtual DMA on account of the ports having no hardware FIFOs |
| 376 | * |
| 377 | * we can generate an interrupt manually in the assembly stubs by writing to |
| 378 | * the enable and detect bits in the interrupt control register, so all we need |
| 379 | * to do here is disable the interrupt line |
| 380 | * |
| 381 | * note that we can't just leave the line enabled as the baud rate timer *also* |
| 382 | * generates interrupts |
| 383 | */ |
| 384 | static void mn10300_serial_mask_ack(unsigned int irq) |
| 385 | { |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 386 | unsigned long flags; |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 387 | u16 tmp; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 388 | |
| 389 | flags = arch_local_cli_save(); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 390 | GxICR(irq) = GxICR_LEVEL_6; |
| 391 | tmp = GxICR(irq); /* flush write buffer */ |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 392 | arch_local_irq_restore(flags); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 393 | } |
| 394 | |
Thomas Gleixner | b023ba5 | 2011-03-18 16:52:52 +0000 | [diff] [blame] | 395 | static void mn10300_serial_chip_mask_ack(struct irq_data *d) |
| 396 | { |
| 397 | mn10300_serial_mask_ack(d->irq); |
| 398 | } |
| 399 | |
| 400 | static void mn10300_serial_nop(struct irq_data *d) |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 401 | { |
| 402 | } |
| 403 | |
| 404 | static struct irq_chip mn10300_serial_pic = { |
| 405 | .name = "mnserial", |
Thomas Gleixner | b023ba5 | 2011-03-18 16:52:52 +0000 | [diff] [blame] | 406 | .irq_ack = mn10300_serial_chip_mask_ack, |
| 407 | .irq_mask = mn10300_serial_chip_mask_ack, |
| 408 | .irq_mask_ack = mn10300_serial_chip_mask_ack, |
| 409 | .irq_unmask = mn10300_serial_nop, |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 410 | }; |
| 411 | |
| 412 | |
| 413 | /* |
| 414 | * serial virtual DMA interrupt jump table |
| 415 | */ |
| 416 | struct mn10300_serial_int mn10300_serial_int_tbl[NR_IRQS]; |
| 417 | |
| 418 | static void mn10300_serial_dis_tx_intr(struct mn10300_serial_port *port) |
| 419 | { |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 420 | unsigned long flags; |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 421 | u16 x; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 422 | |
| 423 | flags = arch_local_cli_save(); |
| 424 | *port->tx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 425 | x = *port->tx_icr; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 426 | arch_local_irq_restore(flags); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | static void mn10300_serial_en_tx_intr(struct mn10300_serial_port *port) |
| 430 | { |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 431 | unsigned long flags; |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 432 | u16 x; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 433 | |
| 434 | flags = arch_local_cli_save(); |
| 435 | *port->tx_icr = |
| 436 | NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL) | GxICR_ENABLE; |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 437 | x = *port->tx_icr; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 438 | arch_local_irq_restore(flags); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | static void mn10300_serial_dis_rx_intr(struct mn10300_serial_port *port) |
| 442 | { |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 443 | unsigned long flags; |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 444 | u16 x; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 445 | |
| 446 | flags = arch_local_cli_save(); |
| 447 | *port->rx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 448 | x = *port->rx_icr; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 449 | arch_local_irq_restore(flags); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 450 | } |
| 451 | |
| 452 | /* |
| 453 | * multi-bit equivalent of test_and_clear_bit() |
| 454 | */ |
| 455 | static int mask_test_and_clear(volatile u8 *ptr, u8 mask) |
| 456 | { |
| 457 | u32 epsw; |
| 458 | asm volatile(" bclr %1,(%2) \n" |
| 459 | " mov epsw,%0 \n" |
Mark Salter | d6bb7a1 | 2010-01-08 14:43:16 -0800 | [diff] [blame] | 460 | : "=d"(epsw) : "d"(mask), "a"(ptr) |
| 461 | : "cc", "memory"); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 462 | return !(epsw & EPSW_FLAG_Z); |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * receive chars from the ring buffer for this serial port |
| 467 | * - must do break detection here (not done in the UART) |
| 468 | */ |
| 469 | static void mn10300_serial_receive_interrupt(struct mn10300_serial_port *port) |
| 470 | { |
| 471 | struct uart_icount *icount = &port->uart.icount; |
David Howells | 7043078 | 2009-09-23 10:40:24 +0100 | [diff] [blame] | 472 | struct tty_struct *tty = port->uart.state->port.tty; |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 473 | unsigned ix; |
| 474 | int count; |
| 475 | u8 st, ch, push, status, overrun; |
| 476 | |
| 477 | _enter("%s", port->name); |
| 478 | |
| 479 | push = 0; |
| 480 | |
| 481 | count = CIRC_CNT(port->rx_inp, port->rx_outp, MNSC_BUFFER_SIZE); |
| 482 | count = tty_buffer_request_room(tty, count); |
| 483 | if (count == 0) { |
| 484 | if (!tty->low_latency) |
| 485 | tty_flip_buffer_push(tty); |
| 486 | return; |
| 487 | } |
| 488 | |
| 489 | try_again: |
| 490 | /* pull chars out of the hat */ |
| 491 | ix = port->rx_outp; |
| 492 | if (ix == port->rx_inp) { |
| 493 | if (push && !tty->low_latency) |
| 494 | tty_flip_buffer_push(tty); |
| 495 | return; |
| 496 | } |
| 497 | |
| 498 | ch = port->rx_buffer[ix++]; |
| 499 | st = port->rx_buffer[ix++]; |
| 500 | smp_rmb(); |
| 501 | port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1); |
| 502 | port->uart.icount.rx++; |
| 503 | |
| 504 | st &= SC01STR_FEF | SC01STR_PEF | SC01STR_OEF; |
| 505 | status = 0; |
| 506 | overrun = 0; |
| 507 | |
| 508 | /* the UART doesn't detect BREAK, so we have to do that ourselves |
| 509 | * - it starts as a framing error on a NUL character |
| 510 | * - then we count another two NUL characters before issuing TTY_BREAK |
| 511 | * - then we end on a normal char or one that has all the bottom bits |
| 512 | * zero and the top bits set |
| 513 | */ |
| 514 | switch (port->rx_brk) { |
| 515 | case 0: |
| 516 | /* not breaking at the moment */ |
| 517 | break; |
| 518 | |
| 519 | case 1: |
| 520 | if (st & SC01STR_FEF && ch == 0) { |
| 521 | port->rx_brk = 2; |
| 522 | goto try_again; |
| 523 | } |
| 524 | goto not_break; |
| 525 | |
| 526 | case 2: |
| 527 | if (st & SC01STR_FEF && ch == 0) { |
| 528 | port->rx_brk = 3; |
| 529 | _proto("Rx Break Detected"); |
| 530 | icount->brk++; |
| 531 | if (uart_handle_break(&port->uart)) |
| 532 | goto ignore_char; |
| 533 | status |= 1 << TTY_BREAK; |
| 534 | goto insert; |
| 535 | } |
| 536 | goto not_break; |
| 537 | |
| 538 | default: |
| 539 | if (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF)) |
| 540 | goto try_again; /* still breaking */ |
| 541 | |
| 542 | port->rx_brk = 0; /* end of the break */ |
| 543 | |
| 544 | switch (ch) { |
| 545 | case 0xFF: |
| 546 | case 0xFE: |
| 547 | case 0xFC: |
| 548 | case 0xF8: |
| 549 | case 0xF0: |
| 550 | case 0xE0: |
| 551 | case 0xC0: |
| 552 | case 0x80: |
| 553 | case 0x00: |
| 554 | /* discard char at probable break end */ |
| 555 | goto try_again; |
| 556 | } |
| 557 | break; |
| 558 | } |
| 559 | |
| 560 | process_errors: |
| 561 | /* handle framing error */ |
| 562 | if (st & SC01STR_FEF) { |
| 563 | if (ch == 0) { |
| 564 | /* framing error with NUL char is probably a BREAK */ |
| 565 | port->rx_brk = 1; |
| 566 | goto try_again; |
| 567 | } |
| 568 | |
| 569 | _proto("Rx Framing Error"); |
| 570 | icount->frame++; |
| 571 | status |= 1 << TTY_FRAME; |
| 572 | } |
| 573 | |
| 574 | /* handle parity error */ |
| 575 | if (st & SC01STR_PEF) { |
| 576 | _proto("Rx Parity Error"); |
| 577 | icount->parity++; |
| 578 | status = TTY_PARITY; |
| 579 | } |
| 580 | |
| 581 | /* handle normal char */ |
| 582 | if (status == 0) { |
| 583 | if (uart_handle_sysrq_char(&port->uart, ch)) |
| 584 | goto ignore_char; |
| 585 | status = (1 << TTY_NORMAL); |
| 586 | } |
| 587 | |
| 588 | /* handle overrun error */ |
| 589 | if (st & SC01STR_OEF) { |
| 590 | if (port->rx_brk) |
| 591 | goto try_again; |
| 592 | |
| 593 | _proto("Rx Overrun Error"); |
| 594 | icount->overrun++; |
| 595 | overrun = 1; |
| 596 | } |
| 597 | |
| 598 | insert: |
| 599 | status &= port->uart.read_status_mask; |
| 600 | |
| 601 | if (!overrun && !(status & port->uart.ignore_status_mask)) { |
| 602 | int flag; |
| 603 | |
| 604 | if (status & (1 << TTY_BREAK)) |
| 605 | flag = TTY_BREAK; |
| 606 | else if (status & (1 << TTY_PARITY)) |
| 607 | flag = TTY_PARITY; |
| 608 | else if (status & (1 << TTY_FRAME)) |
| 609 | flag = TTY_FRAME; |
| 610 | else |
| 611 | flag = TTY_NORMAL; |
| 612 | |
| 613 | tty_insert_flip_char(tty, ch, flag); |
| 614 | } |
| 615 | |
| 616 | /* overrun is special, since it's reported immediately, and doesn't |
| 617 | * affect the current character |
| 618 | */ |
| 619 | if (overrun) |
| 620 | tty_insert_flip_char(tty, 0, TTY_OVERRUN); |
| 621 | |
| 622 | count--; |
| 623 | if (count <= 0) { |
| 624 | if (!tty->low_latency) |
| 625 | tty_flip_buffer_push(tty); |
| 626 | return; |
| 627 | } |
| 628 | |
| 629 | ignore_char: |
| 630 | push = 1; |
| 631 | goto try_again; |
| 632 | |
| 633 | not_break: |
| 634 | port->rx_brk = 0; |
| 635 | goto process_errors; |
| 636 | } |
| 637 | |
| 638 | /* |
| 639 | * handle an interrupt from the serial transmission "virtual DMA" driver |
| 640 | * - note: the interrupt routine will disable its own interrupts when the Tx |
| 641 | * buffer is empty |
| 642 | */ |
| 643 | static void mn10300_serial_transmit_interrupt(struct mn10300_serial_port *port) |
| 644 | { |
| 645 | _enter("%s", port->name); |
| 646 | |
David Howells | 7043078 | 2009-09-23 10:40:24 +0100 | [diff] [blame] | 647 | if (!port->uart.state || !port->uart.state->port.tty) { |
Akira Takeuchi | a8893fb | 2008-12-10 12:43:24 +0000 | [diff] [blame] | 648 | mn10300_serial_dis_tx_intr(port); |
| 649 | return; |
| 650 | } |
| 651 | |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 652 | if (uart_tx_stopped(&port->uart) || |
David Howells | 7043078 | 2009-09-23 10:40:24 +0100 | [diff] [blame] | 653 | uart_circ_empty(&port->uart.state->xmit)) |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 654 | mn10300_serial_dis_tx_intr(port); |
| 655 | |
David Howells | 7043078 | 2009-09-23 10:40:24 +0100 | [diff] [blame] | 656 | if (uart_circ_chars_pending(&port->uart.state->xmit) < WAKEUP_CHARS) |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 657 | uart_write_wakeup(&port->uart); |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * deal with a change in the status of the CTS line |
| 662 | */ |
| 663 | static void mn10300_serial_cts_changed(struct mn10300_serial_port *port, u8 st) |
| 664 | { |
| 665 | u16 ctr; |
| 666 | |
| 667 | port->tx_cts = st; |
| 668 | port->uart.icount.cts++; |
| 669 | |
| 670 | /* flip the CTS state selector flag to interrupt when it changes |
| 671 | * back */ |
| 672 | ctr = *port->_control; |
| 673 | ctr ^= SC2CTR_TWS; |
| 674 | *port->_control = ctr; |
| 675 | |
| 676 | uart_handle_cts_change(&port->uart, st & SC2STR_CTS); |
David Howells | 7043078 | 2009-09-23 10:40:24 +0100 | [diff] [blame] | 677 | wake_up_interruptible(&port->uart.state->port.delta_msr_wait); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | /* |
| 681 | * handle a virtual interrupt generated by the lower level "virtual DMA" |
| 682 | * routines (irq is the baud timer interrupt) |
| 683 | */ |
| 684 | static irqreturn_t mn10300_serial_interrupt(int irq, void *dev_id) |
| 685 | { |
| 686 | struct mn10300_serial_port *port = dev_id; |
| 687 | u8 st; |
| 688 | |
| 689 | spin_lock(&port->uart.lock); |
| 690 | |
| 691 | if (port->intr_flags) { |
| 692 | _debug("INT %s: %x", port->name, port->intr_flags); |
| 693 | |
| 694 | if (mask_test_and_clear(&port->intr_flags, MNSCx_RX_AVAIL)) |
| 695 | mn10300_serial_receive_interrupt(port); |
| 696 | |
| 697 | if (mask_test_and_clear(&port->intr_flags, |
| 698 | MNSCx_TX_SPACE | MNSCx_TX_EMPTY)) |
| 699 | mn10300_serial_transmit_interrupt(port); |
| 700 | } |
| 701 | |
| 702 | /* the only modem control line amongst the whole lot is CTS on |
| 703 | * serial port 2 */ |
| 704 | if (port->type == PORT_MN10300_CTS) { |
| 705 | st = *port->_status; |
| 706 | if ((port->tx_cts ^ st) & SC2STR_CTS) |
| 707 | mn10300_serial_cts_changed(port, st); |
| 708 | } |
| 709 | |
| 710 | spin_unlock(&port->uart.lock); |
| 711 | |
| 712 | return IRQ_HANDLED; |
| 713 | } |
| 714 | |
| 715 | /* |
| 716 | * return indication of whether the hardware transmit buffer is empty |
| 717 | */ |
| 718 | static unsigned int mn10300_serial_tx_empty(struct uart_port *_port) |
| 719 | { |
| 720 | struct mn10300_serial_port *port = |
| 721 | container_of(_port, struct mn10300_serial_port, uart); |
| 722 | |
| 723 | _enter("%s", port->name); |
| 724 | |
| 725 | return (*port->_status & (SC01STR_TXF | SC01STR_TBF)) ? |
| 726 | 0 : TIOCSER_TEMT; |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * set the modem control lines (we don't have any) |
| 731 | */ |
| 732 | static void mn10300_serial_set_mctrl(struct uart_port *_port, |
| 733 | unsigned int mctrl) |
| 734 | { |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 735 | struct mn10300_serial_port *port __attribute__ ((unused)) = |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 736 | container_of(_port, struct mn10300_serial_port, uart); |
| 737 | |
| 738 | _enter("%s,%x", port->name, mctrl); |
| 739 | } |
| 740 | |
| 741 | /* |
| 742 | * get the modem control line statuses |
| 743 | */ |
| 744 | static unsigned int mn10300_serial_get_mctrl(struct uart_port *_port) |
| 745 | { |
| 746 | struct mn10300_serial_port *port = |
| 747 | container_of(_port, struct mn10300_serial_port, uart); |
| 748 | |
| 749 | _enter("%s", port->name); |
| 750 | |
| 751 | if (port->type == PORT_MN10300_CTS && !(*port->_status & SC2STR_CTS)) |
| 752 | return TIOCM_CAR | TIOCM_DSR; |
| 753 | |
| 754 | return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR; |
| 755 | } |
| 756 | |
| 757 | /* |
| 758 | * stop transmitting characters |
| 759 | */ |
| 760 | static void mn10300_serial_stop_tx(struct uart_port *_port) |
| 761 | { |
| 762 | struct mn10300_serial_port *port = |
| 763 | container_of(_port, struct mn10300_serial_port, uart); |
| 764 | |
| 765 | _enter("%s", port->name); |
| 766 | |
| 767 | /* disable the virtual DMA */ |
| 768 | mn10300_serial_dis_tx_intr(port); |
| 769 | } |
| 770 | |
| 771 | /* |
| 772 | * start transmitting characters |
| 773 | * - jump-start transmission if it has stalled |
| 774 | * - enable the serial Tx interrupt (used by the virtual DMA controller) |
| 775 | * - force an interrupt to happen if necessary |
| 776 | */ |
| 777 | static void mn10300_serial_start_tx(struct uart_port *_port) |
| 778 | { |
| 779 | struct mn10300_serial_port *port = |
| 780 | container_of(_port, struct mn10300_serial_port, uart); |
| 781 | |
| 782 | u16 x; |
| 783 | |
| 784 | _enter("%s{%lu}", |
| 785 | port->name, |
David Howells | 7043078 | 2009-09-23 10:40:24 +0100 | [diff] [blame] | 786 | CIRC_CNT(&port->uart.state->xmit.head, |
| 787 | &port->uart.state->xmit.tail, |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 788 | UART_XMIT_SIZE)); |
| 789 | |
| 790 | /* kick the virtual DMA controller */ |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 791 | arch_local_cli(); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 792 | x = *port->tx_icr; |
| 793 | x |= GxICR_ENABLE; |
| 794 | |
| 795 | if (*port->_status & SC01STR_TBF) |
| 796 | x &= ~(GxICR_REQUEST | GxICR_DETECT); |
| 797 | else |
| 798 | x |= GxICR_REQUEST | GxICR_DETECT; |
| 799 | |
| 800 | _debug("CTR=%04hx ICR=%02hx STR=%04x TMD=%02hx TBR=%04hx ICR=%04hx", |
| 801 | *port->_control, *port->_intr, *port->_status, |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 802 | *port->_tmxmd, |
| 803 | (port->div_timer == MNSCx_DIV_TIMER_8BIT) ? |
| 804 | *(volatile u8 *)port->_tmxbr : *port->_tmxbr, |
| 805 | *port->tx_icr); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 806 | |
| 807 | *port->tx_icr = x; |
| 808 | x = *port->tx_icr; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 809 | arch_local_sti(); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 810 | } |
| 811 | |
| 812 | /* |
| 813 | * transmit a high-priority XON/XOFF character |
| 814 | */ |
| 815 | static void mn10300_serial_send_xchar(struct uart_port *_port, char ch) |
| 816 | { |
| 817 | struct mn10300_serial_port *port = |
| 818 | container_of(_port, struct mn10300_serial_port, uart); |
| 819 | |
| 820 | _enter("%s,%02x", port->name, ch); |
| 821 | |
| 822 | if (likely(port->gdbstub)) { |
| 823 | port->tx_xchar = ch; |
| 824 | if (ch) |
| 825 | mn10300_serial_en_tx_intr(port); |
| 826 | } |
| 827 | } |
| 828 | |
| 829 | /* |
| 830 | * stop receiving characters |
| 831 | * - called whilst the port is being closed |
| 832 | */ |
| 833 | static void mn10300_serial_stop_rx(struct uart_port *_port) |
| 834 | { |
| 835 | struct mn10300_serial_port *port = |
| 836 | container_of(_port, struct mn10300_serial_port, uart); |
| 837 | |
| 838 | u16 ctr; |
| 839 | |
| 840 | _enter("%s", port->name); |
| 841 | |
| 842 | ctr = *port->_control; |
| 843 | ctr &= ~SC01CTR_RXE; |
| 844 | *port->_control = ctr; |
| 845 | |
| 846 | mn10300_serial_dis_rx_intr(port); |
| 847 | } |
| 848 | |
| 849 | /* |
| 850 | * enable modem status interrupts |
| 851 | */ |
| 852 | static void mn10300_serial_enable_ms(struct uart_port *_port) |
| 853 | { |
| 854 | struct mn10300_serial_port *port = |
| 855 | container_of(_port, struct mn10300_serial_port, uart); |
| 856 | |
| 857 | u16 ctr, cts; |
| 858 | |
| 859 | _enter("%s", port->name); |
| 860 | |
| 861 | if (port->type == PORT_MN10300_CTS) { |
| 862 | /* want to interrupt when CTS goes low if CTS is now high and |
| 863 | * vice versa |
| 864 | */ |
| 865 | port->tx_cts = *port->_status; |
| 866 | |
| 867 | cts = (port->tx_cts & SC2STR_CTS) ? |
| 868 | SC2CTR_TWE : SC2CTR_TWE | SC2CTR_TWS; |
| 869 | |
| 870 | ctr = *port->_control; |
| 871 | ctr &= ~SC2CTR_TWS; |
| 872 | ctr |= cts; |
| 873 | *port->_control = ctr; |
| 874 | |
| 875 | mn10300_serial_en_tx_intr(port); |
| 876 | } |
| 877 | } |
| 878 | |
| 879 | /* |
| 880 | * transmit or cease transmitting a break signal |
| 881 | */ |
| 882 | static void mn10300_serial_break_ctl(struct uart_port *_port, int ctl) |
| 883 | { |
| 884 | struct mn10300_serial_port *port = |
| 885 | container_of(_port, struct mn10300_serial_port, uart); |
| 886 | |
| 887 | _enter("%s,%d", port->name, ctl); |
| 888 | |
| 889 | if (ctl) { |
| 890 | /* tell the virtual DMA handler to assert BREAK */ |
| 891 | port->tx_break = 1; |
| 892 | mn10300_serial_en_tx_intr(port); |
| 893 | } else { |
| 894 | port->tx_break = 0; |
| 895 | *port->_control &= ~SC01CTR_BKE; |
| 896 | mn10300_serial_en_tx_intr(port); |
| 897 | } |
| 898 | } |
| 899 | |
| 900 | /* |
| 901 | * grab the interrupts and enable the port for reception |
| 902 | */ |
| 903 | static int mn10300_serial_startup(struct uart_port *_port) |
| 904 | { |
| 905 | struct mn10300_serial_port *port = |
| 906 | container_of(_port, struct mn10300_serial_port, uart); |
| 907 | struct mn10300_serial_int *pint; |
| 908 | |
| 909 | _enter("%s{%d}", port->name, port->gdbstub); |
| 910 | |
| 911 | if (unlikely(port->gdbstub)) |
| 912 | return -EBUSY; |
| 913 | |
| 914 | /* allocate an Rx buffer for the virtual DMA handler */ |
| 915 | port->rx_buffer = kmalloc(MNSC_BUFFER_SIZE, GFP_KERNEL); |
| 916 | if (!port->rx_buffer) |
| 917 | return -ENOMEM; |
| 918 | |
| 919 | port->rx_inp = port->rx_outp = 0; |
| 920 | |
| 921 | /* finally, enable the device */ |
| 922 | *port->_intr = SC01ICR_TI; |
| 923 | *port->_control |= SC01CTR_TXE | SC01CTR_RXE; |
| 924 | |
| 925 | pint = &mn10300_serial_int_tbl[port->rx_irq]; |
| 926 | pint->port = port; |
| 927 | pint->vdma = mn10300_serial_vdma_rx_handler; |
| 928 | pint = &mn10300_serial_int_tbl[port->tx_irq]; |
| 929 | pint->port = port; |
| 930 | pint->vdma = mn10300_serial_vdma_tx_handler; |
| 931 | |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 932 | set_intr_level(port->rx_irq, |
| 933 | NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL)); |
| 934 | set_intr_level(port->tx_irq, |
| 935 | NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL)); |
Thomas Gleixner | f4c547e | 2011-03-24 17:35:56 +0100 | [diff] [blame] | 936 | irq_set_chip(port->tm_irq, &mn10300_serial_pic); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 937 | |
| 938 | if (request_irq(port->rx_irq, mn10300_serial_interrupt, |
| 939 | IRQF_DISABLED, port->rx_name, port) < 0) |
| 940 | goto error; |
| 941 | |
| 942 | if (request_irq(port->tx_irq, mn10300_serial_interrupt, |
| 943 | IRQF_DISABLED, port->tx_name, port) < 0) |
| 944 | goto error2; |
| 945 | |
| 946 | if (request_irq(port->tm_irq, mn10300_serial_interrupt, |
| 947 | IRQF_DISABLED, port->tm_name, port) < 0) |
| 948 | goto error3; |
| 949 | mn10300_serial_mask_ack(port->tm_irq); |
| 950 | |
| 951 | return 0; |
| 952 | |
| 953 | error3: |
| 954 | free_irq(port->tx_irq, port); |
| 955 | error2: |
| 956 | free_irq(port->rx_irq, port); |
| 957 | error: |
| 958 | kfree(port->rx_buffer); |
| 959 | port->rx_buffer = NULL; |
| 960 | return -EBUSY; |
| 961 | } |
| 962 | |
| 963 | /* |
| 964 | * shutdown the port and release interrupts |
| 965 | */ |
| 966 | static void mn10300_serial_shutdown(struct uart_port *_port) |
| 967 | { |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 968 | u16 x; |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 969 | struct mn10300_serial_port *port = |
| 970 | container_of(_port, struct mn10300_serial_port, uart); |
| 971 | |
| 972 | _enter("%s", port->name); |
| 973 | |
| 974 | /* disable the serial port and its baud rate timer */ |
| 975 | port->tx_break = 0; |
| 976 | *port->_control &= ~(SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE); |
| 977 | *port->_tmxmd = 0; |
| 978 | |
| 979 | if (port->rx_buffer) { |
| 980 | void *buf = port->rx_buffer; |
| 981 | port->rx_buffer = NULL; |
| 982 | kfree(buf); |
| 983 | } |
| 984 | |
| 985 | /* disable all intrs */ |
| 986 | free_irq(port->tm_irq, port); |
| 987 | free_irq(port->rx_irq, port); |
| 988 | free_irq(port->tx_irq, port); |
| 989 | |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 990 | arch_local_cli(); |
| 991 | *port->rx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL); |
| 992 | x = *port->rx_icr; |
| 993 | *port->tx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL); |
| 994 | x = *port->tx_icr; |
| 995 | arch_local_sti(); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 996 | } |
| 997 | |
| 998 | /* |
| 999 | * this routine is called to set the UART divisor registers to match the |
| 1000 | * specified baud rate for a serial port. |
| 1001 | */ |
| 1002 | static void mn10300_serial_change_speed(struct mn10300_serial_port *port, |
| 1003 | struct ktermios *new, |
| 1004 | struct ktermios *old) |
| 1005 | { |
| 1006 | unsigned long flags; |
| 1007 | unsigned long ioclk = port->ioclk; |
| 1008 | unsigned cflag; |
| 1009 | int baud, bits, xdiv, tmp; |
| 1010 | u16 tmxbr, scxctr; |
| 1011 | u8 tmxmd, battempt; |
| 1012 | u8 div_timer = port->div_timer; |
| 1013 | |
| 1014 | _enter("%s{%lu}", port->name, ioclk); |
| 1015 | |
| 1016 | /* byte size and parity */ |
| 1017 | cflag = new->c_cflag; |
| 1018 | switch (cflag & CSIZE) { |
| 1019 | case CS7: scxctr = SC01CTR_CLN_7BIT; bits = 9; break; |
| 1020 | case CS8: scxctr = SC01CTR_CLN_8BIT; bits = 10; break; |
| 1021 | default: scxctr = SC01CTR_CLN_8BIT; bits = 10; break; |
| 1022 | } |
| 1023 | |
| 1024 | if (cflag & CSTOPB) { |
| 1025 | scxctr |= SC01CTR_STB_2BIT; |
| 1026 | bits++; |
| 1027 | } |
| 1028 | |
| 1029 | if (cflag & PARENB) { |
| 1030 | bits++; |
| 1031 | if (cflag & PARODD) |
| 1032 | scxctr |= SC01CTR_PB_ODD; |
| 1033 | #ifdef CMSPAR |
| 1034 | else if (cflag & CMSPAR) |
| 1035 | scxctr |= SC01CTR_PB_FIXED0; |
| 1036 | #endif |
| 1037 | else |
| 1038 | scxctr |= SC01CTR_PB_EVEN; |
| 1039 | } |
| 1040 | |
| 1041 | /* Determine divisor based on baud rate */ |
| 1042 | battempt = 0; |
| 1043 | |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1044 | switch (port->uart.line) { |
| 1045 | #ifdef CONFIG_MN10300_TTYSM0 |
| 1046 | case 0: /* ttySM0 */ |
| 1047 | #if defined(CONFIG_MN10300_TTYSM0_TIMER8) |
| 1048 | scxctr |= SC0CTR_CK_TM8UFLOW_8; |
| 1049 | #elif defined(CONFIG_MN10300_TTYSM0_TIMER0) |
| 1050 | scxctr |= SC0CTR_CK_TM0UFLOW_8; |
| 1051 | #elif defined(CONFIG_MN10300_TTYSM0_TIMER2) |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1052 | scxctr |= SC0CTR_CK_TM2UFLOW_8; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1053 | #else |
| 1054 | #error "Unknown config for ttySM0" |
| 1055 | #endif |
| 1056 | break; |
| 1057 | #endif /* CONFIG_MN10300_TTYSM0 */ |
| 1058 | |
| 1059 | #ifdef CONFIG_MN10300_TTYSM1 |
| 1060 | case 1: /* ttySM1 */ |
| 1061 | #if defined(CONFIG_AM33_2) || defined(CONFIG_AM33_3) |
| 1062 | #if defined(CONFIG_MN10300_TTYSM1_TIMER9) |
| 1063 | scxctr |= SC1CTR_CK_TM9UFLOW_8; |
| 1064 | #elif defined(CONFIG_MN10300_TTYSM1_TIMER3) |
| 1065 | scxctr |= SC1CTR_CK_TM3UFLOW_8; |
| 1066 | #else |
| 1067 | #error "Unknown config for ttySM1" |
| 1068 | #endif |
| 1069 | #else /* CONFIG_AM33_2 || CONFIG_AM33_3 */ |
| 1070 | #if defined(CONFIG_MN10300_TTYSM1_TIMER12) |
| 1071 | scxctr |= SC1CTR_CK_TM12UFLOW_8; |
| 1072 | #else |
| 1073 | #error "Unknown config for ttySM1" |
| 1074 | #endif |
| 1075 | #endif /* CONFIG_AM33_2 || CONFIG_AM33_3 */ |
| 1076 | break; |
| 1077 | #endif /* CONFIG_MN10300_TTYSM1 */ |
| 1078 | |
| 1079 | #ifdef CONFIG_MN10300_TTYSM2 |
| 1080 | case 2: /* ttySM2 */ |
| 1081 | #if defined(CONFIG_AM33_2) |
| 1082 | #if defined(CONFIG_MN10300_TTYSM2_TIMER10) |
| 1083 | scxctr |= SC2CTR_CK_TM10UFLOW; |
| 1084 | #else |
| 1085 | #error "Unknown config for ttySM2" |
| 1086 | #endif |
| 1087 | #else /* CONFIG_AM33_2 */ |
| 1088 | #if defined(CONFIG_MN10300_TTYSM2_TIMER9) |
| 1089 | scxctr |= SC2CTR_CK_TM9UFLOW_8; |
| 1090 | #elif defined(CONFIG_MN10300_TTYSM2_TIMER1) |
| 1091 | scxctr |= SC2CTR_CK_TM1UFLOW_8; |
| 1092 | #elif defined(CONFIG_MN10300_TTYSM2_TIMER3) |
| 1093 | scxctr |= SC2CTR_CK_TM3UFLOW_8; |
| 1094 | #else |
| 1095 | #error "Unknown config for ttySM2" |
| 1096 | #endif |
| 1097 | #endif /* CONFIG_AM33_2 */ |
| 1098 | break; |
| 1099 | #endif /* CONFIG_MN10300_TTYSM2 */ |
| 1100 | |
| 1101 | default: |
| 1102 | break; |
| 1103 | } |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1104 | |
| 1105 | try_alternative: |
| 1106 | baud = uart_get_baud_rate(&port->uart, new, old, 0, |
| 1107 | port->ioclk / 8); |
| 1108 | |
| 1109 | _debug("ALT %d [baud %d]", battempt, baud); |
| 1110 | |
| 1111 | if (!baud) |
| 1112 | baud = 9600; /* B0 transition handled in rs_set_termios */ |
| 1113 | xdiv = 1; |
| 1114 | if (baud == 134) { |
| 1115 | baud = 269; /* 134 is really 134.5 */ |
| 1116 | xdiv = 2; |
| 1117 | } |
| 1118 | |
| 1119 | if (baud == 38400 && |
| 1120 | (port->uart.flags & UPF_SPD_MASK) == UPF_SPD_CUST |
| 1121 | ) { |
| 1122 | _debug("CUSTOM %u", port->uart.custom_divisor); |
| 1123 | |
| 1124 | if (div_timer == MNSCx_DIV_TIMER_16BIT) { |
| 1125 | if (port->uart.custom_divisor <= 65535) { |
| 1126 | tmxmd = TM8MD_SRC_IOCLK; |
| 1127 | tmxbr = port->uart.custom_divisor; |
| 1128 | port->uart.uartclk = ioclk; |
| 1129 | goto timer_okay; |
| 1130 | } |
| 1131 | if (port->uart.custom_divisor / 8 <= 65535) { |
| 1132 | tmxmd = TM8MD_SRC_IOCLK_8; |
| 1133 | tmxbr = port->uart.custom_divisor / 8; |
| 1134 | port->uart.custom_divisor = tmxbr * 8; |
| 1135 | port->uart.uartclk = ioclk / 8; |
| 1136 | goto timer_okay; |
| 1137 | } |
| 1138 | if (port->uart.custom_divisor / 32 <= 65535) { |
| 1139 | tmxmd = TM8MD_SRC_IOCLK_32; |
| 1140 | tmxbr = port->uart.custom_divisor / 32; |
| 1141 | port->uart.custom_divisor = tmxbr * 32; |
| 1142 | port->uart.uartclk = ioclk / 32; |
| 1143 | goto timer_okay; |
| 1144 | } |
| 1145 | |
| 1146 | } else if (div_timer == MNSCx_DIV_TIMER_8BIT) { |
| 1147 | if (port->uart.custom_divisor <= 255) { |
| 1148 | tmxmd = TM2MD_SRC_IOCLK; |
| 1149 | tmxbr = port->uart.custom_divisor; |
| 1150 | port->uart.uartclk = ioclk; |
| 1151 | goto timer_okay; |
| 1152 | } |
| 1153 | if (port->uart.custom_divisor / 8 <= 255) { |
| 1154 | tmxmd = TM2MD_SRC_IOCLK_8; |
| 1155 | tmxbr = port->uart.custom_divisor / 8; |
| 1156 | port->uart.custom_divisor = tmxbr * 8; |
| 1157 | port->uart.uartclk = ioclk / 8; |
| 1158 | goto timer_okay; |
| 1159 | } |
| 1160 | if (port->uart.custom_divisor / 32 <= 255) { |
| 1161 | tmxmd = TM2MD_SRC_IOCLK_32; |
| 1162 | tmxbr = port->uart.custom_divisor / 32; |
| 1163 | port->uart.custom_divisor = tmxbr * 32; |
| 1164 | port->uart.uartclk = ioclk / 32; |
| 1165 | goto timer_okay; |
| 1166 | } |
| 1167 | } |
| 1168 | } |
| 1169 | |
| 1170 | switch (div_timer) { |
| 1171 | case MNSCx_DIV_TIMER_16BIT: |
| 1172 | port->uart.uartclk = ioclk; |
| 1173 | tmxmd = TM8MD_SRC_IOCLK; |
| 1174 | tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1; |
| 1175 | if (tmp > 0 && tmp <= 65535) |
| 1176 | goto timer_okay; |
| 1177 | |
| 1178 | port->uart.uartclk = ioclk / 8; |
| 1179 | tmxmd = TM8MD_SRC_IOCLK_8; |
| 1180 | tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1; |
| 1181 | if (tmp > 0 && tmp <= 65535) |
| 1182 | goto timer_okay; |
| 1183 | |
| 1184 | port->uart.uartclk = ioclk / 32; |
| 1185 | tmxmd = TM8MD_SRC_IOCLK_32; |
| 1186 | tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1; |
| 1187 | if (tmp > 0 && tmp <= 65535) |
| 1188 | goto timer_okay; |
| 1189 | break; |
| 1190 | |
| 1191 | case MNSCx_DIV_TIMER_8BIT: |
| 1192 | port->uart.uartclk = ioclk; |
| 1193 | tmxmd = TM2MD_SRC_IOCLK; |
| 1194 | tmxbr = tmp = (ioclk / (baud * xdiv) + 4) / 8 - 1; |
| 1195 | if (tmp > 0 && tmp <= 255) |
| 1196 | goto timer_okay; |
| 1197 | |
| 1198 | port->uart.uartclk = ioclk / 8; |
| 1199 | tmxmd = TM2MD_SRC_IOCLK_8; |
| 1200 | tmxbr = tmp = (ioclk / (baud * 8 * xdiv) + 4) / 8 - 1; |
| 1201 | if (tmp > 0 && tmp <= 255) |
| 1202 | goto timer_okay; |
| 1203 | |
| 1204 | port->uart.uartclk = ioclk / 32; |
| 1205 | tmxmd = TM2MD_SRC_IOCLK_32; |
| 1206 | tmxbr = tmp = (ioclk / (baud * 32 * xdiv) + 4) / 8 - 1; |
| 1207 | if (tmp > 0 && tmp <= 255) |
| 1208 | goto timer_okay; |
| 1209 | break; |
| 1210 | |
| 1211 | default: |
| 1212 | BUG(); |
| 1213 | return; |
| 1214 | } |
| 1215 | |
| 1216 | /* refuse to change to a baud rate we can't support */ |
| 1217 | _debug("CAN'T SUPPORT"); |
| 1218 | |
| 1219 | switch (battempt) { |
| 1220 | case 0: |
| 1221 | if (old) { |
| 1222 | new->c_cflag &= ~CBAUD; |
| 1223 | new->c_cflag |= (old->c_cflag & CBAUD); |
| 1224 | battempt = 1; |
| 1225 | goto try_alternative; |
| 1226 | } |
| 1227 | |
| 1228 | case 1: |
| 1229 | /* as a last resort, if the quotient is zero, default to 9600 |
| 1230 | * bps */ |
| 1231 | new->c_cflag &= ~CBAUD; |
| 1232 | new->c_cflag |= B9600; |
| 1233 | battempt = 2; |
| 1234 | goto try_alternative; |
| 1235 | |
| 1236 | default: |
| 1237 | /* hmmm... can't seem to support 9600 either |
| 1238 | * - we could try iterating through the speeds we know about to |
| 1239 | * find the lowest |
| 1240 | */ |
| 1241 | new->c_cflag &= ~CBAUD; |
| 1242 | new->c_cflag |= B0; |
| 1243 | |
| 1244 | if (div_timer == MNSCx_DIV_TIMER_16BIT) |
| 1245 | tmxmd = TM8MD_SRC_IOCLK_32; |
| 1246 | else if (div_timer == MNSCx_DIV_TIMER_8BIT) |
| 1247 | tmxmd = TM2MD_SRC_IOCLK_32; |
| 1248 | tmxbr = 1; |
| 1249 | |
| 1250 | port->uart.uartclk = ioclk / 32; |
| 1251 | break; |
| 1252 | } |
| 1253 | timer_okay: |
| 1254 | |
| 1255 | _debug("UARTCLK: %u / %hu", port->uart.uartclk, tmxbr); |
| 1256 | |
| 1257 | /* make the changes */ |
| 1258 | spin_lock_irqsave(&port->uart.lock, flags); |
| 1259 | |
| 1260 | uart_update_timeout(&port->uart, new->c_cflag, baud); |
| 1261 | |
| 1262 | /* set the timer to produce the required baud rate */ |
| 1263 | switch (div_timer) { |
| 1264 | case MNSCx_DIV_TIMER_16BIT: |
| 1265 | *port->_tmxmd = 0; |
| 1266 | *port->_tmxbr = tmxbr; |
| 1267 | *port->_tmxmd = TM8MD_INIT_COUNTER; |
| 1268 | *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE; |
| 1269 | break; |
| 1270 | |
| 1271 | case MNSCx_DIV_TIMER_8BIT: |
| 1272 | *port->_tmxmd = 0; |
| 1273 | *(volatile u8 *) port->_tmxbr = (u8) tmxbr; |
| 1274 | *port->_tmxmd = TM2MD_INIT_COUNTER; |
| 1275 | *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE; |
| 1276 | break; |
| 1277 | } |
| 1278 | |
| 1279 | /* CTS flow control flag and modem status interrupts */ |
| 1280 | scxctr &= ~(SC2CTR_TWE | SC2CTR_TWS); |
| 1281 | |
| 1282 | if (port->type == PORT_MN10300_CTS && cflag & CRTSCTS) { |
| 1283 | /* want to interrupt when CTS goes low if CTS is now |
| 1284 | * high and vice versa |
| 1285 | */ |
| 1286 | port->tx_cts = *port->_status; |
| 1287 | |
| 1288 | if (port->tx_cts & SC2STR_CTS) |
| 1289 | scxctr |= SC2CTR_TWE; |
| 1290 | else |
| 1291 | scxctr |= SC2CTR_TWE | SC2CTR_TWS; |
| 1292 | } |
| 1293 | |
| 1294 | /* set up parity check flag */ |
| 1295 | port->uart.read_status_mask = (1 << TTY_NORMAL) | (1 << TTY_OVERRUN); |
| 1296 | if (new->c_iflag & INPCK) |
| 1297 | port->uart.read_status_mask |= |
| 1298 | (1 << TTY_PARITY) | (1 << TTY_FRAME); |
| 1299 | if (new->c_iflag & (BRKINT | PARMRK)) |
| 1300 | port->uart.read_status_mask |= (1 << TTY_BREAK); |
| 1301 | |
| 1302 | /* characters to ignore */ |
| 1303 | port->uart.ignore_status_mask = 0; |
| 1304 | if (new->c_iflag & IGNPAR) |
| 1305 | port->uart.ignore_status_mask |= |
| 1306 | (1 << TTY_PARITY) | (1 << TTY_FRAME); |
| 1307 | if (new->c_iflag & IGNBRK) { |
| 1308 | port->uart.ignore_status_mask |= (1 << TTY_BREAK); |
| 1309 | /* |
| 1310 | * If we're ignoring parity and break indicators, |
| 1311 | * ignore overruns to (for real raw support). |
| 1312 | */ |
| 1313 | if (new->c_iflag & IGNPAR) |
| 1314 | port->uart.ignore_status_mask |= (1 << TTY_OVERRUN); |
| 1315 | } |
| 1316 | |
| 1317 | /* Ignore all characters if CREAD is not set */ |
| 1318 | if ((new->c_cflag & CREAD) == 0) |
| 1319 | port->uart.ignore_status_mask |= (1 << TTY_NORMAL); |
| 1320 | |
| 1321 | scxctr |= *port->_control & (SC01CTR_TXE | SC01CTR_RXE | SC01CTR_BKE); |
| 1322 | *port->_control = scxctr; |
| 1323 | |
| 1324 | spin_unlock_irqrestore(&port->uart.lock, flags); |
| 1325 | } |
| 1326 | |
| 1327 | /* |
| 1328 | * set the terminal I/O parameters |
| 1329 | */ |
| 1330 | static void mn10300_serial_set_termios(struct uart_port *_port, |
| 1331 | struct ktermios *new, |
| 1332 | struct ktermios *old) |
| 1333 | { |
| 1334 | struct mn10300_serial_port *port = |
| 1335 | container_of(_port, struct mn10300_serial_port, uart); |
| 1336 | |
| 1337 | _enter("%s,%p,%p", port->name, new, old); |
| 1338 | |
| 1339 | mn10300_serial_change_speed(port, new, old); |
| 1340 | |
| 1341 | /* handle turning off CRTSCTS */ |
| 1342 | if (!(new->c_cflag & CRTSCTS)) { |
| 1343 | u16 ctr = *port->_control; |
| 1344 | ctr &= ~SC2CTR_TWE; |
| 1345 | *port->_control = ctr; |
| 1346 | } |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1347 | |
| 1348 | /* change Transfer bit-order (LSB/MSB) */ |
| 1349 | if (new->c_cflag & CODMSB) |
| 1350 | *port->_control |= SC01CTR_OD_MSBFIRST; /* MSB MODE */ |
| 1351 | else |
| 1352 | *port->_control &= ~SC01CTR_OD_MSBFIRST; /* LSB MODE */ |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1353 | } |
| 1354 | |
| 1355 | /* |
| 1356 | * return description of port type |
| 1357 | */ |
| 1358 | static const char *mn10300_serial_type(struct uart_port *_port) |
| 1359 | { |
| 1360 | struct mn10300_serial_port *port = |
| 1361 | container_of(_port, struct mn10300_serial_port, uart); |
| 1362 | |
| 1363 | if (port->uart.type == PORT_MN10300_CTS) |
| 1364 | return "MN10300 SIF_CTS"; |
| 1365 | |
| 1366 | return "MN10300 SIF"; |
| 1367 | } |
| 1368 | |
| 1369 | /* |
| 1370 | * release I/O and memory regions in use by port |
| 1371 | */ |
| 1372 | static void mn10300_serial_release_port(struct uart_port *_port) |
| 1373 | { |
| 1374 | struct mn10300_serial_port *port = |
| 1375 | container_of(_port, struct mn10300_serial_port, uart); |
| 1376 | |
| 1377 | _enter("%s", port->name); |
| 1378 | |
| 1379 | release_mem_region((unsigned long) port->_iobase, 16); |
| 1380 | } |
| 1381 | |
| 1382 | /* |
| 1383 | * request I/O and memory regions for port |
| 1384 | */ |
| 1385 | static int mn10300_serial_request_port(struct uart_port *_port) |
| 1386 | { |
| 1387 | struct mn10300_serial_port *port = |
| 1388 | container_of(_port, struct mn10300_serial_port, uart); |
| 1389 | |
| 1390 | _enter("%s", port->name); |
| 1391 | |
| 1392 | request_mem_region((unsigned long) port->_iobase, 16, port->name); |
| 1393 | return 0; |
| 1394 | } |
| 1395 | |
| 1396 | /* |
| 1397 | * configure the type and reserve the ports |
| 1398 | */ |
| 1399 | static void mn10300_serial_config_port(struct uart_port *_port, int type) |
| 1400 | { |
| 1401 | struct mn10300_serial_port *port = |
| 1402 | container_of(_port, struct mn10300_serial_port, uart); |
| 1403 | |
| 1404 | _enter("%s", port->name); |
| 1405 | |
| 1406 | port->uart.type = PORT_MN10300; |
| 1407 | |
| 1408 | if (port->options & MNSCx_OPT_CTS) |
| 1409 | port->uart.type = PORT_MN10300_CTS; |
| 1410 | |
| 1411 | mn10300_serial_request_port(_port); |
| 1412 | } |
| 1413 | |
| 1414 | /* |
| 1415 | * verify serial parameters are suitable for this port type |
| 1416 | */ |
| 1417 | static int mn10300_serial_verify_port(struct uart_port *_port, |
| 1418 | struct serial_struct *ss) |
| 1419 | { |
| 1420 | struct mn10300_serial_port *port = |
| 1421 | container_of(_port, struct mn10300_serial_port, uart); |
| 1422 | void *mapbase = (void *) (unsigned long) port->uart.mapbase; |
| 1423 | |
| 1424 | _enter("%s", port->name); |
| 1425 | |
| 1426 | /* these things may not be changed */ |
| 1427 | if (ss->irq != port->uart.irq || |
| 1428 | ss->port != port->uart.iobase || |
| 1429 | ss->io_type != port->uart.iotype || |
| 1430 | ss->iomem_base != mapbase || |
| 1431 | ss->iomem_reg_shift != port->uart.regshift || |
| 1432 | ss->hub6 != port->uart.hub6 || |
| 1433 | ss->xmit_fifo_size != port->uart.fifosize) |
| 1434 | return -EINVAL; |
| 1435 | |
| 1436 | /* type may be changed on a port that supports CTS */ |
| 1437 | if (ss->type != port->uart.type) { |
| 1438 | if (!(port->options & MNSCx_OPT_CTS)) |
| 1439 | return -EINVAL; |
| 1440 | |
| 1441 | if (ss->type != PORT_MN10300 && |
| 1442 | ss->type != PORT_MN10300_CTS) |
| 1443 | return -EINVAL; |
| 1444 | } |
| 1445 | |
| 1446 | return 0; |
| 1447 | } |
| 1448 | |
| 1449 | /* |
| 1450 | * initialise the MN10300 on-chip UARTs |
| 1451 | */ |
| 1452 | static int __init mn10300_serial_init(void) |
| 1453 | { |
| 1454 | struct mn10300_serial_port *port; |
| 1455 | int ret, i; |
| 1456 | |
| 1457 | printk(KERN_INFO "%s version %s (%s)\n", |
| 1458 | serial_name, serial_version, serial_revdate); |
| 1459 | |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1460 | #if defined(CONFIG_MN10300_TTYSM2) && defined(CONFIG_AM33_2) |
| 1461 | { |
| 1462 | int tmp; |
| 1463 | SC2TIM = 8; /* make the baud base of timer 2 IOCLK/8 */ |
| 1464 | tmp = SC2TIM; |
| 1465 | } |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1466 | #endif |
| 1467 | |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1468 | set_intr_stub(NUM2EXCEP_IRQ_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL), |
| 1469 | mn10300_serial_vdma_interrupt); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1470 | |
| 1471 | ret = uart_register_driver(&mn10300_serial_driver); |
| 1472 | if (!ret) { |
| 1473 | for (i = 0 ; i < NR_PORTS ; i++) { |
| 1474 | port = mn10300_serial_ports[i]; |
| 1475 | if (!port || port->gdbstub) |
| 1476 | continue; |
| 1477 | |
| 1478 | switch (port->clock_src) { |
| 1479 | case MNSCx_CLOCK_SRC_IOCLK: |
| 1480 | port->ioclk = MN10300_IOCLK; |
| 1481 | break; |
| 1482 | |
| 1483 | #ifdef MN10300_IOBCLK |
| 1484 | case MNSCx_CLOCK_SRC_IOBCLK: |
| 1485 | port->ioclk = MN10300_IOBCLK; |
| 1486 | break; |
| 1487 | #endif |
| 1488 | default: |
| 1489 | BUG(); |
| 1490 | } |
| 1491 | |
| 1492 | ret = uart_add_one_port(&mn10300_serial_driver, |
| 1493 | &port->uart); |
| 1494 | |
| 1495 | if (ret < 0) { |
| 1496 | _debug("ERROR %d", -ret); |
| 1497 | break; |
| 1498 | } |
| 1499 | } |
| 1500 | |
| 1501 | if (ret) |
| 1502 | uart_unregister_driver(&mn10300_serial_driver); |
| 1503 | } |
| 1504 | |
| 1505 | return ret; |
| 1506 | } |
| 1507 | |
| 1508 | __initcall(mn10300_serial_init); |
| 1509 | |
| 1510 | |
| 1511 | #ifdef CONFIG_MN10300_TTYSM_CONSOLE |
| 1512 | |
| 1513 | /* |
| 1514 | * print a string to the serial port without disturbing the real user of the |
| 1515 | * port too much |
| 1516 | * - the console must be locked by the caller |
| 1517 | */ |
| 1518 | static void mn10300_serial_console_write(struct console *co, |
| 1519 | const char *s, unsigned count) |
| 1520 | { |
| 1521 | struct mn10300_serial_port *port; |
| 1522 | unsigned i; |
| 1523 | u16 scxctr, txicr, tmp; |
| 1524 | u8 tmxmd; |
| 1525 | |
| 1526 | port = mn10300_serial_ports[co->index]; |
| 1527 | |
| 1528 | /* firstly hijack the serial port from the "virtual DMA" controller */ |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1529 | arch_local_cli(); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1530 | txicr = *port->tx_icr; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1531 | *port->tx_icr = NUM2GxICR_LEVEL(CONFIG_MN10300_SERIAL_IRQ_LEVEL); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1532 | tmp = *port->tx_icr; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1533 | arch_local_sti(); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1534 | |
| 1535 | /* the transmitter may be disabled */ |
| 1536 | scxctr = *port->_control; |
| 1537 | if (!(scxctr & SC01CTR_TXE)) { |
| 1538 | /* restart the UART clock */ |
| 1539 | tmxmd = *port->_tmxmd; |
| 1540 | |
| 1541 | switch (port->div_timer) { |
| 1542 | case MNSCx_DIV_TIMER_16BIT: |
| 1543 | *port->_tmxmd = 0; |
| 1544 | *port->_tmxmd = TM8MD_INIT_COUNTER; |
| 1545 | *port->_tmxmd = tmxmd | TM8MD_COUNT_ENABLE; |
| 1546 | break; |
| 1547 | |
| 1548 | case MNSCx_DIV_TIMER_8BIT: |
| 1549 | *port->_tmxmd = 0; |
| 1550 | *port->_tmxmd = TM2MD_INIT_COUNTER; |
| 1551 | *port->_tmxmd = tmxmd | TM2MD_COUNT_ENABLE; |
| 1552 | break; |
| 1553 | } |
| 1554 | |
| 1555 | /* enable the transmitter */ |
| 1556 | *port->_control = (scxctr & ~SC01CTR_BKE) | SC01CTR_TXE; |
| 1557 | |
| 1558 | } else if (scxctr & SC01CTR_BKE) { |
| 1559 | /* stop transmitting BREAK */ |
| 1560 | *port->_control = (scxctr & ~SC01CTR_BKE); |
| 1561 | } |
| 1562 | |
| 1563 | /* send the chars into the serial port (with LF -> LFCR conversion) */ |
| 1564 | for (i = 0; i < count; i++) { |
| 1565 | char ch = *s++; |
| 1566 | |
| 1567 | while (*port->_status & SC01STR_TBF) |
| 1568 | continue; |
| 1569 | *(u8 *) port->_txb = ch; |
| 1570 | |
| 1571 | if (ch == 0x0a) { |
| 1572 | while (*port->_status & SC01STR_TBF) |
| 1573 | continue; |
| 1574 | *(u8 *) port->_txb = 0xd; |
| 1575 | } |
| 1576 | } |
| 1577 | |
| 1578 | /* can't let the transmitter be turned off if it's actually |
| 1579 | * transmitting */ |
| 1580 | while (*port->_status & (SC01STR_TXF | SC01STR_TBF)) |
| 1581 | continue; |
| 1582 | |
| 1583 | /* disable the transmitter if we re-enabled it */ |
| 1584 | if (!(scxctr & SC01CTR_TXE)) |
| 1585 | *port->_control = scxctr; |
| 1586 | |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1587 | arch_local_cli(); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1588 | *port->tx_icr = txicr; |
| 1589 | tmp = *port->tx_icr; |
Akira Takeuchi | 368dd5a | 2010-10-27 17:28:55 +0100 | [diff] [blame] | 1590 | arch_local_sti(); |
David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 1591 | } |
| 1592 | |
| 1593 | /* |
| 1594 | * set up a serial port as a console |
| 1595 | * - construct a cflag setting for the first rs_open() |
| 1596 | * - initialize the serial port |
| 1597 | * - return non-zero if we didn't find a serial port. |
| 1598 | */ |
| 1599 | static int __init mn10300_serial_console_setup(struct console *co, |
| 1600 | char *options) |
| 1601 | { |
| 1602 | struct mn10300_serial_port *port; |
| 1603 | int i, parity = 'n', baud = 9600, bits = 8, flow = 0; |
| 1604 | |
| 1605 | for (i = 0 ; i < NR_PORTS ; i++) { |
| 1606 | port = mn10300_serial_ports[i]; |
| 1607 | if (port && !port->gdbstub && port->uart.line == co->index) |
| 1608 | goto found_device; |
| 1609 | } |
| 1610 | |
| 1611 | return -ENODEV; |
| 1612 | |
| 1613 | found_device: |
| 1614 | switch (port->clock_src) { |
| 1615 | case MNSCx_CLOCK_SRC_IOCLK: |
| 1616 | port->ioclk = MN10300_IOCLK; |
| 1617 | break; |
| 1618 | |
| 1619 | #ifdef MN10300_IOBCLK |
| 1620 | case MNSCx_CLOCK_SRC_IOBCLK: |
| 1621 | port->ioclk = MN10300_IOBCLK; |
| 1622 | break; |
| 1623 | #endif |
| 1624 | default: |
| 1625 | BUG(); |
| 1626 | } |
| 1627 | |
| 1628 | if (options) |
| 1629 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 1630 | |
| 1631 | return uart_set_options(&port->uart, co, baud, parity, bits, flow); |
| 1632 | } |
| 1633 | |
| 1634 | /* |
| 1635 | * register console |
| 1636 | */ |
| 1637 | static int __init mn10300_serial_console_init(void) |
| 1638 | { |
| 1639 | register_console(&mn10300_serial_console); |
| 1640 | return 0; |
| 1641 | } |
| 1642 | |
| 1643 | console_initcall(mn10300_serial_console_init); |
| 1644 | #endif |
David Howells | 52885b3 | 2011-03-18 16:54:32 +0000 | [diff] [blame] | 1645 | |
| 1646 | #ifdef CONFIG_CONSOLE_POLL |
| 1647 | /* |
| 1648 | * Polled character reception for the kernel debugger |
| 1649 | */ |
| 1650 | static int mn10300_serial_poll_get_char(struct uart_port *_port) |
| 1651 | { |
| 1652 | struct mn10300_serial_port *port = |
| 1653 | container_of(_port, struct mn10300_serial_port, uart); |
| 1654 | unsigned ix; |
| 1655 | u8 st, ch; |
| 1656 | |
| 1657 | _enter("%s", port->name); |
| 1658 | |
| 1659 | do { |
| 1660 | /* pull chars out of the hat */ |
| 1661 | ix = port->rx_outp; |
| 1662 | if (ix == port->rx_inp) |
| 1663 | return NO_POLL_CHAR; |
| 1664 | |
| 1665 | ch = port->rx_buffer[ix++]; |
| 1666 | st = port->rx_buffer[ix++]; |
| 1667 | smp_rmb(); |
| 1668 | port->rx_outp = ix & (MNSC_BUFFER_SIZE - 1); |
| 1669 | |
| 1670 | } while (st & (SC01STR_FEF | SC01STR_PEF | SC01STR_OEF)); |
| 1671 | |
| 1672 | return ch; |
| 1673 | } |
| 1674 | |
| 1675 | |
| 1676 | /* |
| 1677 | * Polled character transmission for the kernel debugger |
| 1678 | */ |
| 1679 | static void mn10300_serial_poll_put_char(struct uart_port *_port, |
| 1680 | unsigned char ch) |
| 1681 | { |
| 1682 | struct mn10300_serial_port *port = |
| 1683 | container_of(_port, struct mn10300_serial_port, uart); |
| 1684 | u8 intr, tmp; |
| 1685 | |
| 1686 | /* wait for the transmitter to finish anything it might be doing (and |
| 1687 | * this includes the virtual DMA handler, so it might take a while) */ |
| 1688 | while (*port->_status & (SC01STR_TBF | SC01STR_TXF)) |
| 1689 | continue; |
| 1690 | |
| 1691 | /* disable the Tx ready interrupt */ |
| 1692 | intr = *port->_intr; |
| 1693 | *port->_intr = intr & ~SC01ICR_TI; |
| 1694 | tmp = *port->_intr; |
| 1695 | |
| 1696 | if (ch == 0x0a) { |
| 1697 | *(u8 *) port->_txb = 0x0d; |
| 1698 | while (*port->_status & SC01STR_TBF) |
| 1699 | continue; |
| 1700 | } |
| 1701 | |
| 1702 | *(u8 *) port->_txb = ch; |
| 1703 | while (*port->_status & SC01STR_TBF) |
| 1704 | continue; |
| 1705 | |
| 1706 | /* restore the Tx interrupt flag */ |
| 1707 | *port->_intr = intr; |
| 1708 | tmp = *port->_intr; |
| 1709 | } |
| 1710 | |
| 1711 | #endif /* CONFIG_CONSOLE_POLL */ |