Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Based on drivers/serial/8250.c by Russell King. |
| 3 | * |
| 4 | * Author: Nicolas Pitre |
| 5 | * Created: Feb 20, 2003 |
| 6 | * Copyright: (C) 2003 Monta Vista Software, Inc. |
| 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 | * Note 1: This driver is made separate from the already too overloaded |
| 14 | * 8250.c because it needs some kirks of its own and that'll make it |
| 15 | * easier to add DMA support. |
| 16 | * |
| 17 | * Note 2: I'm too sick of device allocation policies for serial ports. |
| 18 | * If someone else wants to request an "official" allocation of major/minor |
| 19 | * for this driver please be my guest. And don't forget that new hardware |
| 20 | * to come from Intel might have more than 3 or 4 of those UARTs. Let's |
| 21 | * hope for a better port registration and dynamic device allocation scheme |
| 22 | * with the serial core maintainer satisfaction to appear soon. |
| 23 | */ |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #if defined(CONFIG_SERIAL_PXA_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
| 27 | #define SUPPORT_SYSRQ |
| 28 | #endif |
| 29 | |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/ioport.h> |
| 32 | #include <linux/init.h> |
| 33 | #include <linux/console.h> |
| 34 | #include <linux/sysrq.h> |
| 35 | #include <linux/serial_reg.h> |
| 36 | #include <linux/circ_buf.h> |
| 37 | #include <linux/delay.h> |
| 38 | #include <linux/interrupt.h> |
Haojian Zhuang | 699c20f | 2012-02-29 16:09:05 +0800 | [diff] [blame] | 39 | #include <linux/of.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 40 | #include <linux/platform_device.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/tty.h> |
| 42 | #include <linux/tty_flip.h> |
| 43 | #include <linux/serial_core.h> |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 44 | #include <linux/clk.h> |
Eric Miao | 290a558 | 2009-01-14 19:12:42 +0800 | [diff] [blame] | 45 | #include <linux/io.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 46 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Haojian Zhuang | 699c20f | 2012-02-29 16:09:05 +0800 | [diff] [blame] | 48 | #define PXA_NAME_LEN 8 |
| 49 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | struct uart_pxa_port { |
| 51 | struct uart_port port; |
| 52 | unsigned char ier; |
| 53 | unsigned char lcr; |
| 54 | unsigned char mcr; |
| 55 | unsigned int lsr_break_flag; |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 56 | struct clk *clk; |
Haojian Zhuang | 699c20f | 2012-02-29 16:09:05 +0800 | [diff] [blame] | 57 | char name[PXA_NAME_LEN]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | }; |
| 59 | |
| 60 | static inline unsigned int serial_in(struct uart_pxa_port *up, int offset) |
| 61 | { |
| 62 | offset <<= 2; |
| 63 | return readl(up->port.membase + offset); |
| 64 | } |
| 65 | |
| 66 | static inline void serial_out(struct uart_pxa_port *up, int offset, int value) |
| 67 | { |
| 68 | offset <<= 2; |
| 69 | writel(value, up->port.membase + offset); |
| 70 | } |
| 71 | |
| 72 | static void serial_pxa_enable_ms(struct uart_port *port) |
| 73 | { |
| 74 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 75 | |
| 76 | up->ier |= UART_IER_MSI; |
| 77 | serial_out(up, UART_IER, up->ier); |
| 78 | } |
| 79 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 80 | static void serial_pxa_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
| 82 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 83 | |
| 84 | if (up->ier & UART_IER_THRI) { |
| 85 | up->ier &= ~UART_IER_THRI; |
| 86 | serial_out(up, UART_IER, up->ier); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | static void serial_pxa_stop_rx(struct uart_port *port) |
| 91 | { |
| 92 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 93 | |
| 94 | up->ier &= ~UART_IER_RLSI; |
| 95 | up->port.read_status_mask &= ~UART_LSR_DR; |
| 96 | serial_out(up, UART_IER, up->ier); |
| 97 | } |
| 98 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 99 | static inline void receive_chars(struct uart_pxa_port *up, int *status) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 101 | struct tty_struct *tty = up->port.state->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | unsigned int ch, flag; |
| 103 | int max_count = 256; |
| 104 | |
| 105 | do { |
Marcus Folkesson | e44aabd | 2011-08-30 13:53:10 +0200 | [diff] [blame] | 106 | /* work around Errata #20 according to |
| 107 | * Intel(R) PXA27x Processor Family |
| 108 | * Specification Update (May 2005) |
| 109 | * |
| 110 | * Step 2 |
| 111 | * Disable the Reciever Time Out Interrupt via IER[RTOEI] |
| 112 | */ |
| 113 | up->ier &= ~UART_IER_RTOIE; |
| 114 | serial_out(up, UART_IER, up->ier); |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | ch = serial_in(up, UART_RX); |
| 117 | flag = TTY_NORMAL; |
| 118 | up->port.icount.rx++; |
| 119 | |
| 120 | if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | |
| 121 | UART_LSR_FE | UART_LSR_OE))) { |
| 122 | /* |
| 123 | * For statistics only |
| 124 | */ |
| 125 | if (*status & UART_LSR_BI) { |
| 126 | *status &= ~(UART_LSR_FE | UART_LSR_PE); |
| 127 | up->port.icount.brk++; |
| 128 | /* |
| 129 | * We do the SysRQ and SAK checking |
| 130 | * here because otherwise the break |
| 131 | * may get masked by ignore_status_mask |
| 132 | * or read_status_mask. |
| 133 | */ |
| 134 | if (uart_handle_break(&up->port)) |
| 135 | goto ignore_char; |
| 136 | } else if (*status & UART_LSR_PE) |
| 137 | up->port.icount.parity++; |
| 138 | else if (*status & UART_LSR_FE) |
| 139 | up->port.icount.frame++; |
| 140 | if (*status & UART_LSR_OE) |
| 141 | up->port.icount.overrun++; |
| 142 | |
| 143 | /* |
| 144 | * Mask off conditions which should be ignored. |
| 145 | */ |
| 146 | *status &= up->port.read_status_mask; |
| 147 | |
| 148 | #ifdef CONFIG_SERIAL_PXA_CONSOLE |
| 149 | if (up->port.line == up->port.cons->index) { |
| 150 | /* Recover the break flag from console xmit */ |
| 151 | *status |= up->lsr_break_flag; |
| 152 | up->lsr_break_flag = 0; |
| 153 | } |
| 154 | #endif |
| 155 | if (*status & UART_LSR_BI) { |
| 156 | flag = TTY_BREAK; |
| 157 | } else if (*status & UART_LSR_PE) |
| 158 | flag = TTY_PARITY; |
| 159 | else if (*status & UART_LSR_FE) |
| 160 | flag = TTY_FRAME; |
| 161 | } |
Russell King | 05ab301 | 2005-05-09 23:21:59 +0100 | [diff] [blame] | 162 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 163 | if (uart_handle_sysrq_char(&up->port, ch)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | goto ignore_char; |
Russell King | 05ab301 | 2005-05-09 23:21:59 +0100 | [diff] [blame] | 165 | |
| 166 | uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag); |
| 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | ignore_char: |
| 169 | *status = serial_in(up, UART_LSR); |
| 170 | } while ((*status & UART_LSR_DR) && (max_count-- > 0)); |
| 171 | tty_flip_buffer_push(tty); |
Marcus Folkesson | e44aabd | 2011-08-30 13:53:10 +0200 | [diff] [blame] | 172 | |
| 173 | /* work around Errata #20 according to |
| 174 | * Intel(R) PXA27x Processor Family |
| 175 | * Specification Update (May 2005) |
| 176 | * |
| 177 | * Step 6: |
| 178 | * No more data in FIFO: Re-enable RTO interrupt via IER[RTOIE] |
| 179 | */ |
| 180 | up->ier |= UART_IER_RTOIE; |
| 181 | serial_out(up, UART_IER, up->ier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | static void transmit_chars(struct uart_pxa_port *up) |
| 185 | { |
Alan Cox | ebd2c8f | 2009-09-19 13:13:28 -0700 | [diff] [blame] | 186 | struct circ_buf *xmit = &up->port.state->xmit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | int count; |
| 188 | |
| 189 | if (up->port.x_char) { |
| 190 | serial_out(up, UART_TX, up->port.x_char); |
| 191 | up->port.icount.tx++; |
| 192 | up->port.x_char = 0; |
| 193 | return; |
| 194 | } |
| 195 | if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 196 | serial_pxa_stop_tx(&up->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | return; |
| 198 | } |
| 199 | |
| 200 | count = up->port.fifosize / 2; |
| 201 | do { |
| 202 | serial_out(up, UART_TX, xmit->buf[xmit->tail]); |
| 203 | xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
| 204 | up->port.icount.tx++; |
| 205 | if (uart_circ_empty(xmit)) |
| 206 | break; |
| 207 | } while (--count > 0); |
| 208 | |
| 209 | if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
| 210 | uart_write_wakeup(&up->port); |
| 211 | |
| 212 | |
| 213 | if (uart_circ_empty(xmit)) |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 214 | serial_pxa_stop_tx(&up->port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
| 216 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 217 | static void serial_pxa_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | { |
| 219 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 220 | |
| 221 | if (!(up->ier & UART_IER_THRI)) { |
| 222 | up->ier |= UART_IER_THRI; |
| 223 | serial_out(up, UART_IER, up->ier); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | static inline void check_modem_status(struct uart_pxa_port *up) |
| 228 | { |
| 229 | int status; |
| 230 | |
| 231 | status = serial_in(up, UART_MSR); |
| 232 | |
| 233 | if ((status & UART_MSR_ANY_DELTA) == 0) |
| 234 | return; |
| 235 | |
| 236 | if (status & UART_MSR_TERI) |
| 237 | up->port.icount.rng++; |
| 238 | if (status & UART_MSR_DDSR) |
| 239 | up->port.icount.dsr++; |
| 240 | if (status & UART_MSR_DDCD) |
| 241 | uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); |
| 242 | if (status & UART_MSR_DCTS) |
| 243 | uart_handle_cts_change(&up->port, status & UART_MSR_CTS); |
| 244 | |
Alan Cox | bdc04e3 | 2009-09-19 13:13:31 -0700 | [diff] [blame] | 245 | wake_up_interruptible(&up->port.state->port.delta_msr_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | |
| 248 | /* |
| 249 | * This handles the interrupt from one port. |
| 250 | */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 251 | static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | { |
Jeff Garzik | c7bec5a | 2006-10-06 15:00:58 -0400 | [diff] [blame] | 253 | struct uart_pxa_port *up = dev_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | unsigned int iir, lsr; |
| 255 | |
| 256 | iir = serial_in(up, UART_IIR); |
| 257 | if (iir & UART_IIR_NO_INT) |
| 258 | return IRQ_NONE; |
| 259 | lsr = serial_in(up, UART_LSR); |
| 260 | if (lsr & UART_LSR_DR) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 261 | receive_chars(up, &lsr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | check_modem_status(up); |
| 263 | if (lsr & UART_LSR_THRE) |
| 264 | transmit_chars(up); |
| 265 | return IRQ_HANDLED; |
| 266 | } |
| 267 | |
| 268 | static unsigned int serial_pxa_tx_empty(struct uart_port *port) |
| 269 | { |
| 270 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 271 | unsigned long flags; |
| 272 | unsigned int ret; |
| 273 | |
| 274 | spin_lock_irqsave(&up->port.lock, flags); |
| 275 | ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; |
| 276 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 277 | |
| 278 | return ret; |
| 279 | } |
| 280 | |
| 281 | static unsigned int serial_pxa_get_mctrl(struct uart_port *port) |
| 282 | { |
| 283 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | unsigned char status; |
| 285 | unsigned int ret; |
| 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | status = serial_in(up, UART_MSR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
| 289 | ret = 0; |
| 290 | if (status & UART_MSR_DCD) |
| 291 | ret |= TIOCM_CAR; |
| 292 | if (status & UART_MSR_RI) |
| 293 | ret |= TIOCM_RNG; |
| 294 | if (status & UART_MSR_DSR) |
| 295 | ret |= TIOCM_DSR; |
| 296 | if (status & UART_MSR_CTS) |
| 297 | ret |= TIOCM_CTS; |
| 298 | return ret; |
| 299 | } |
| 300 | |
| 301 | static void serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 302 | { |
| 303 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 304 | unsigned char mcr = 0; |
| 305 | |
| 306 | if (mctrl & TIOCM_RTS) |
| 307 | mcr |= UART_MCR_RTS; |
| 308 | if (mctrl & TIOCM_DTR) |
| 309 | mcr |= UART_MCR_DTR; |
| 310 | if (mctrl & TIOCM_OUT1) |
| 311 | mcr |= UART_MCR_OUT1; |
| 312 | if (mctrl & TIOCM_OUT2) |
| 313 | mcr |= UART_MCR_OUT2; |
| 314 | if (mctrl & TIOCM_LOOP) |
| 315 | mcr |= UART_MCR_LOOP; |
| 316 | |
| 317 | mcr |= up->mcr; |
| 318 | |
| 319 | serial_out(up, UART_MCR, mcr); |
| 320 | } |
| 321 | |
| 322 | static void serial_pxa_break_ctl(struct uart_port *port, int break_state) |
| 323 | { |
| 324 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 325 | unsigned long flags; |
| 326 | |
| 327 | spin_lock_irqsave(&up->port.lock, flags); |
| 328 | if (break_state == -1) |
| 329 | up->lcr |= UART_LCR_SBC; |
| 330 | else |
| 331 | up->lcr &= ~UART_LCR_SBC; |
| 332 | serial_out(up, UART_LCR, up->lcr); |
| 333 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 334 | } |
| 335 | |
| 336 | #if 0 |
| 337 | static void serial_pxa_dma_init(struct pxa_uart *up) |
| 338 | { |
| 339 | up->rxdma = |
| 340 | pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up); |
| 341 | if (up->rxdma < 0) |
| 342 | goto out; |
| 343 | up->txdma = |
| 344 | pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up); |
| 345 | if (up->txdma < 0) |
| 346 | goto err_txdma; |
| 347 | up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL); |
| 348 | if (!up->dmadesc) |
| 349 | goto err_alloc; |
| 350 | |
| 351 | /* ... */ |
| 352 | err_alloc: |
| 353 | pxa_free_dma(up->txdma); |
| 354 | err_rxdma: |
| 355 | pxa_free_dma(up->rxdma); |
| 356 | out: |
| 357 | return; |
| 358 | } |
| 359 | #endif |
| 360 | |
| 361 | static int serial_pxa_startup(struct uart_port *port) |
| 362 | { |
| 363 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 364 | unsigned long flags; |
| 365 | int retval; |
| 366 | |
Matt Reimer | d9e2964 | 2005-10-28 16:25:02 +0100 | [diff] [blame] | 367 | if (port->line == 3) /* HWUART */ |
| 368 | up->mcr |= UART_MCR_AFE; |
| 369 | else |
Erik Hovland | f02aa3f | 2005-12-30 15:57:35 +0000 | [diff] [blame] | 370 | up->mcr = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 372 | up->port.uartclk = clk_get_rate(up->clk); |
| 373 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | /* |
| 375 | * Allocate the IRQ |
| 376 | */ |
| 377 | retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up); |
| 378 | if (retval) |
| 379 | return retval; |
| 380 | |
| 381 | /* |
| 382 | * Clear the FIFO buffers and disable them. |
| 383 | * (they will be reenabled in set_termios()) |
| 384 | */ |
| 385 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); |
| 386 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | |
| 387 | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); |
| 388 | serial_out(up, UART_FCR, 0); |
| 389 | |
| 390 | /* |
| 391 | * Clear the interrupt registers. |
| 392 | */ |
| 393 | (void) serial_in(up, UART_LSR); |
| 394 | (void) serial_in(up, UART_RX); |
| 395 | (void) serial_in(up, UART_IIR); |
| 396 | (void) serial_in(up, UART_MSR); |
| 397 | |
| 398 | /* |
| 399 | * Now, initialize the UART |
| 400 | */ |
| 401 | serial_out(up, UART_LCR, UART_LCR_WLEN8); |
| 402 | |
| 403 | spin_lock_irqsave(&up->port.lock, flags); |
| 404 | up->port.mctrl |= TIOCM_OUT2; |
| 405 | serial_pxa_set_mctrl(&up->port, up->port.mctrl); |
| 406 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 407 | |
| 408 | /* |
| 409 | * Finally, enable interrupts. Note: Modem status interrupts |
Adrian Bunk | 80f7228 | 2006-06-30 18:27:16 +0200 | [diff] [blame] | 410 | * are set via set_termios(), which will be occurring imminently |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | * anyway, so we don't enable them here. |
| 412 | */ |
| 413 | up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE; |
| 414 | serial_out(up, UART_IER, up->ier); |
| 415 | |
| 416 | /* |
| 417 | * And clear the interrupt registers again for luck. |
| 418 | */ |
| 419 | (void) serial_in(up, UART_LSR); |
| 420 | (void) serial_in(up, UART_RX); |
| 421 | (void) serial_in(up, UART_IIR); |
| 422 | (void) serial_in(up, UART_MSR); |
| 423 | |
| 424 | return 0; |
| 425 | } |
| 426 | |
| 427 | static void serial_pxa_shutdown(struct uart_port *port) |
| 428 | { |
| 429 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 430 | unsigned long flags; |
| 431 | |
| 432 | free_irq(up->port.irq, up); |
| 433 | |
| 434 | /* |
| 435 | * Disable interrupts from this port |
| 436 | */ |
| 437 | up->ier = 0; |
| 438 | serial_out(up, UART_IER, 0); |
| 439 | |
| 440 | spin_lock_irqsave(&up->port.lock, flags); |
| 441 | up->port.mctrl &= ~TIOCM_OUT2; |
| 442 | serial_pxa_set_mctrl(&up->port, up->port.mctrl); |
| 443 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 444 | |
| 445 | /* |
| 446 | * Disable break condition and FIFOs |
| 447 | */ |
| 448 | serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); |
| 449 | serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | |
| 450 | UART_FCR_CLEAR_RCVR | |
| 451 | UART_FCR_CLEAR_XMIT); |
| 452 | serial_out(up, UART_FCR, 0); |
| 453 | } |
| 454 | |
| 455 | static void |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 456 | serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios, |
| 457 | struct ktermios *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | { |
| 459 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 460 | unsigned char cval, fcr = 0; |
| 461 | unsigned long flags; |
| 462 | unsigned int baud, quot; |
Uwe Kleine-König | c934878 | 2009-11-06 21:40:46 +0100 | [diff] [blame] | 463 | unsigned int dll; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
| 465 | switch (termios->c_cflag & CSIZE) { |
| 466 | case CS5: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 467 | cval = UART_LCR_WLEN5; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | break; |
| 469 | case CS6: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 470 | cval = UART_LCR_WLEN6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | break; |
| 472 | case CS7: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 473 | cval = UART_LCR_WLEN7; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | break; |
| 475 | default: |
| 476 | case CS8: |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 477 | cval = UART_LCR_WLEN8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | break; |
| 479 | } |
| 480 | |
| 481 | if (termios->c_cflag & CSTOPB) |
Russell King | 0a8b80c5 | 2005-06-24 19:48:22 +0100 | [diff] [blame] | 482 | cval |= UART_LCR_STOP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | if (termios->c_cflag & PARENB) |
| 484 | cval |= UART_LCR_PARITY; |
| 485 | if (!(termios->c_cflag & PARODD)) |
| 486 | cval |= UART_LCR_EPAR; |
| 487 | |
| 488 | /* |
| 489 | * Ask the core to calculate the divisor for us. |
| 490 | */ |
| 491 | baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); |
| 492 | quot = uart_get_divisor(port, baud); |
| 493 | |
| 494 | if ((up->port.uartclk / quot) < (2400 * 16)) |
| 495 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1; |
Matt Reimer | d9e2964 | 2005-10-28 16:25:02 +0100 | [diff] [blame] | 496 | else if ((up->port.uartclk / quot) < (230400 * 16)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8; |
Matt Reimer | d9e2964 | 2005-10-28 16:25:02 +0100 | [diff] [blame] | 498 | else |
| 499 | fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
| 501 | /* |
| 502 | * Ok, we're now changing the port state. Do it with |
| 503 | * interrupts disabled. |
| 504 | */ |
| 505 | spin_lock_irqsave(&up->port.lock, flags); |
| 506 | |
| 507 | /* |
| 508 | * Ensure the port will be enabled. |
| 509 | * This is required especially for serial console. |
| 510 | */ |
Eric Miao | 290a558 | 2009-01-14 19:12:42 +0800 | [diff] [blame] | 511 | up->ier |= UART_IER_UUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
| 513 | /* |
| 514 | * Update the per-port timeout. |
| 515 | */ |
Lothar Wassmann | e6158b4 | 2005-10-12 19:58:11 +0100 | [diff] [blame] | 516 | uart_update_timeout(port, termios->c_cflag, baud); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | |
| 518 | up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; |
| 519 | if (termios->c_iflag & INPCK) |
| 520 | up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; |
| 521 | if (termios->c_iflag & (BRKINT | PARMRK)) |
| 522 | up->port.read_status_mask |= UART_LSR_BI; |
| 523 | |
| 524 | /* |
| 525 | * Characters to ignore |
| 526 | */ |
| 527 | up->port.ignore_status_mask = 0; |
| 528 | if (termios->c_iflag & IGNPAR) |
| 529 | up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; |
| 530 | if (termios->c_iflag & IGNBRK) { |
| 531 | up->port.ignore_status_mask |= UART_LSR_BI; |
| 532 | /* |
| 533 | * If we're ignoring parity and break indicators, |
| 534 | * ignore overruns too (for real raw support). |
| 535 | */ |
| 536 | if (termios->c_iflag & IGNPAR) |
| 537 | up->port.ignore_status_mask |= UART_LSR_OE; |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * ignore all characters if CREAD is not set |
| 542 | */ |
| 543 | if ((termios->c_cflag & CREAD) == 0) |
| 544 | up->port.ignore_status_mask |= UART_LSR_DR; |
| 545 | |
| 546 | /* |
| 547 | * CTS flow control flag and modem status interrupts |
| 548 | */ |
| 549 | up->ier &= ~UART_IER_MSI; |
| 550 | if (UART_ENABLE_MS(&up->port, termios->c_cflag)) |
| 551 | up->ier |= UART_IER_MSI; |
| 552 | |
| 553 | serial_out(up, UART_IER, up->ier); |
| 554 | |
Robert Jarzmik | 2276f03 | 2008-09-06 23:01:32 +0100 | [diff] [blame] | 555 | if (termios->c_cflag & CRTSCTS) |
| 556 | up->mcr |= UART_MCR_AFE; |
| 557 | else |
| 558 | up->mcr &= ~UART_MCR_AFE; |
| 559 | |
Uwe Kleine-König | c934878 | 2009-11-06 21:40:46 +0100 | [diff] [blame] | 560 | serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ |
Uwe Kleine-König | c934878 | 2009-11-06 21:40:46 +0100 | [diff] [blame] | 562 | |
| 563 | /* |
| 564 | * work around Errata #75 according to Intel(R) PXA27x Processor Family |
| 565 | * Specification Update (Nov 2005) |
| 566 | */ |
| 567 | dll = serial_in(up, UART_DLL); |
| 568 | WARN_ON(dll != (quot & 0xff)); |
| 569 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */ |
Uwe Kleine-König | c934878 | 2009-11-06 21:40:46 +0100 | [diff] [blame] | 571 | serial_out(up, UART_LCR, cval); /* reset DLAB */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | up->lcr = cval; /* Save LCR */ |
| 573 | serial_pxa_set_mctrl(&up->port, up->port.mctrl); |
| 574 | serial_out(up, UART_FCR, fcr); |
| 575 | spin_unlock_irqrestore(&up->port.lock, flags); |
| 576 | } |
| 577 | |
| 578 | static void |
| 579 | serial_pxa_pm(struct uart_port *port, unsigned int state, |
| 580 | unsigned int oldstate) |
| 581 | { |
| 582 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 583 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | if (!state) |
Philipp Zabel | fb8ebec | 2012-03-15 19:15:15 +0100 | [diff] [blame] | 585 | clk_prepare_enable(up->clk); |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 586 | else |
Philipp Zabel | fb8ebec | 2012-03-15 19:15:15 +0100 | [diff] [blame] | 587 | clk_disable_unprepare(up->clk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
| 589 | |
| 590 | static void serial_pxa_release_port(struct uart_port *port) |
| 591 | { |
| 592 | } |
| 593 | |
| 594 | static int serial_pxa_request_port(struct uart_port *port) |
| 595 | { |
| 596 | return 0; |
| 597 | } |
| 598 | |
| 599 | static void serial_pxa_config_port(struct uart_port *port, int flags) |
| 600 | { |
| 601 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 602 | up->port.type = PORT_PXA; |
| 603 | } |
| 604 | |
| 605 | static int |
| 606 | serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser) |
| 607 | { |
| 608 | /* we don't want the core code to modify any port params */ |
| 609 | return -EINVAL; |
| 610 | } |
| 611 | |
| 612 | static const char * |
| 613 | serial_pxa_type(struct uart_port *port) |
| 614 | { |
| 615 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 616 | return up->name; |
| 617 | } |
| 618 | |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 619 | static struct uart_pxa_port *serial_pxa_ports[4]; |
Vincent Sanders | 2d93486 | 2005-09-14 22:36:03 +0100 | [diff] [blame] | 620 | static struct uart_driver serial_pxa_reg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Philipp Zabel | fa7f151 | 2007-11-22 17:52:47 +0100 | [diff] [blame] | 622 | #ifdef CONFIG_SERIAL_PXA_CONSOLE |
| 623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) |
| 625 | |
| 626 | /* |
| 627 | * Wait for transmitter & holding register to empty |
| 628 | */ |
| 629 | static inline void wait_for_xmitr(struct uart_pxa_port *up) |
| 630 | { |
| 631 | unsigned int status, tmout = 10000; |
| 632 | |
| 633 | /* Wait up to 10ms for the character(s) to be sent. */ |
| 634 | do { |
| 635 | status = serial_in(up, UART_LSR); |
| 636 | |
| 637 | if (status & UART_LSR_BI) |
| 638 | up->lsr_break_flag = UART_LSR_BI; |
| 639 | |
| 640 | if (--tmout == 0) |
| 641 | break; |
| 642 | udelay(1); |
| 643 | } while ((status & BOTH_EMPTY) != BOTH_EMPTY); |
| 644 | |
| 645 | /* Wait up to 1s for flow control if necessary */ |
| 646 | if (up->port.flags & UPF_CONS_FLOW) { |
| 647 | tmout = 1000000; |
| 648 | while (--tmout && |
| 649 | ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0)) |
| 650 | udelay(1); |
| 651 | } |
| 652 | } |
| 653 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 654 | static void serial_pxa_console_putchar(struct uart_port *port, int ch) |
| 655 | { |
| 656 | struct uart_pxa_port *up = (struct uart_pxa_port *)port; |
| 657 | |
| 658 | wait_for_xmitr(up); |
| 659 | serial_out(up, UART_TX, ch); |
| 660 | } |
| 661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | /* |
| 663 | * Print a string to the serial port trying not to disturb |
| 664 | * any possible real use of the port... |
| 665 | * |
| 666 | * The console_lock must be held when we get here. |
| 667 | */ |
| 668 | static void |
| 669 | serial_pxa_console_write(struct console *co, const char *s, unsigned int count) |
| 670 | { |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 671 | struct uart_pxa_port *up = serial_pxa_ports[co->index]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | unsigned int ier; |
Chao Xie | cfe275c | 2012-06-14 12:18:46 +0800 | [diff] [blame] | 673 | unsigned long flags; |
| 674 | int locked = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
Philipp Zabel | fb8ebec | 2012-03-15 19:15:15 +0100 | [diff] [blame] | 676 | clk_prepare_enable(up->clk); |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 677 | |
Chao Xie | cfe275c | 2012-06-14 12:18:46 +0800 | [diff] [blame] | 678 | local_irq_save(flags); |
| 679 | if (up->port.sysrq) |
| 680 | locked = 0; |
| 681 | else if (oops_in_progress) |
| 682 | locked = spin_trylock(&up->port.lock); |
| 683 | else |
| 684 | spin_lock(&up->port.lock); |
| 685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | /* |
Erik Hovland | f02aa3f | 2005-12-30 15:57:35 +0000 | [diff] [blame] | 687 | * First save the IER then disable the interrupts |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | */ |
| 689 | ier = serial_in(up, UART_IER); |
| 690 | serial_out(up, UART_IER, UART_IER_UUE); |
| 691 | |
Russell King | d358788 | 2006-03-20 20:00:09 +0000 | [diff] [blame] | 692 | uart_console_write(&up->port, s, count, serial_pxa_console_putchar); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
| 694 | /* |
| 695 | * Finally, wait for transmitter to become empty |
| 696 | * and restore the IER |
| 697 | */ |
| 698 | wait_for_xmitr(up); |
| 699 | serial_out(up, UART_IER, ier); |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 700 | |
Chao Xie | cfe275c | 2012-06-14 12:18:46 +0800 | [diff] [blame] | 701 | if (locked) |
| 702 | spin_unlock(&up->port.lock); |
| 703 | local_irq_restore(flags); |
| 704 | |
Philipp Zabel | fb8ebec | 2012-03-15 19:15:15 +0100 | [diff] [blame] | 705 | clk_disable_unprepare(up->clk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | } |
| 707 | |
| 708 | static int __init |
| 709 | serial_pxa_console_setup(struct console *co, char *options) |
| 710 | { |
| 711 | struct uart_pxa_port *up; |
| 712 | int baud = 9600; |
| 713 | int bits = 8; |
| 714 | int parity = 'n'; |
| 715 | int flow = 'n'; |
| 716 | |
| 717 | if (co->index == -1 || co->index >= serial_pxa_reg.nr) |
| 718 | co->index = 0; |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 719 | up = serial_pxa_ports[co->index]; |
| 720 | if (!up) |
| 721 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
| 723 | if (options) |
| 724 | uart_parse_options(options, &baud, &parity, &bits, &flow); |
| 725 | |
| 726 | return uart_set_options(&up->port, co, baud, parity, bits, flow); |
| 727 | } |
| 728 | |
| 729 | static struct console serial_pxa_console = { |
| 730 | .name = "ttyS", |
| 731 | .write = serial_pxa_console_write, |
| 732 | .device = uart_console_device, |
| 733 | .setup = serial_pxa_console_setup, |
| 734 | .flags = CON_PRINTBUFFER, |
| 735 | .index = -1, |
| 736 | .data = &serial_pxa_reg, |
| 737 | }; |
| 738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | #define PXA_CONSOLE &serial_pxa_console |
| 740 | #else |
| 741 | #define PXA_CONSOLE NULL |
| 742 | #endif |
| 743 | |
| 744 | struct uart_ops serial_pxa_pops = { |
| 745 | .tx_empty = serial_pxa_tx_empty, |
| 746 | .set_mctrl = serial_pxa_set_mctrl, |
| 747 | .get_mctrl = serial_pxa_get_mctrl, |
| 748 | .stop_tx = serial_pxa_stop_tx, |
| 749 | .start_tx = serial_pxa_start_tx, |
| 750 | .stop_rx = serial_pxa_stop_rx, |
| 751 | .enable_ms = serial_pxa_enable_ms, |
| 752 | .break_ctl = serial_pxa_break_ctl, |
| 753 | .startup = serial_pxa_startup, |
| 754 | .shutdown = serial_pxa_shutdown, |
| 755 | .set_termios = serial_pxa_set_termios, |
| 756 | .pm = serial_pxa_pm, |
| 757 | .type = serial_pxa_type, |
| 758 | .release_port = serial_pxa_release_port, |
| 759 | .request_port = serial_pxa_request_port, |
| 760 | .config_port = serial_pxa_config_port, |
| 761 | .verify_port = serial_pxa_verify_port, |
| 762 | }; |
| 763 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | static struct uart_driver serial_pxa_reg = { |
| 765 | .owner = THIS_MODULE, |
| 766 | .driver_name = "PXA serial", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | .dev_name = "ttyS", |
| 768 | .major = TTY_MAJOR, |
| 769 | .minor = 64, |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 770 | .nr = 4, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | .cons = PXA_CONSOLE, |
| 772 | }; |
| 773 | |
Mike Rapoport | bf56c75 | 2009-07-21 17:48:43 +0300 | [diff] [blame] | 774 | #ifdef CONFIG_PM |
| 775 | static int serial_pxa_suspend(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | { |
Mike Rapoport | bf56c75 | 2009-07-21 17:48:43 +0300 | [diff] [blame] | 777 | struct uart_pxa_port *sport = dev_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 779 | if (sport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | uart_suspend_port(&serial_pxa_reg, &sport->port); |
| 781 | |
| 782 | return 0; |
| 783 | } |
| 784 | |
Mike Rapoport | bf56c75 | 2009-07-21 17:48:43 +0300 | [diff] [blame] | 785 | static int serial_pxa_resume(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | { |
Mike Rapoport | bf56c75 | 2009-07-21 17:48:43 +0300 | [diff] [blame] | 787 | struct uart_pxa_port *sport = dev_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 789 | if (sport) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | uart_resume_port(&serial_pxa_reg, &sport->port); |
| 791 | |
| 792 | return 0; |
| 793 | } |
| 794 | |
Alexey Dobriyan | 4714521 | 2009-12-14 18:00:08 -0800 | [diff] [blame] | 795 | static const struct dev_pm_ops serial_pxa_pm_ops = { |
Mike Rapoport | bf56c75 | 2009-07-21 17:48:43 +0300 | [diff] [blame] | 796 | .suspend = serial_pxa_suspend, |
| 797 | .resume = serial_pxa_resume, |
| 798 | }; |
| 799 | #endif |
| 800 | |
Haojian Zhuang | 699c20f | 2012-02-29 16:09:05 +0800 | [diff] [blame] | 801 | static struct of_device_id serial_pxa_dt_ids[] = { |
| 802 | { .compatible = "mrvl,pxa-uart", }, |
| 803 | { .compatible = "mrvl,mmp-uart", }, |
| 804 | {} |
| 805 | }; |
| 806 | MODULE_DEVICE_TABLE(of, serial_pxa_dt_ids); |
| 807 | |
| 808 | static int serial_pxa_probe_dt(struct platform_device *pdev, |
| 809 | struct uart_pxa_port *sport) |
| 810 | { |
| 811 | struct device_node *np = pdev->dev.of_node; |
| 812 | int ret; |
| 813 | |
| 814 | if (!np) |
| 815 | return 1; |
| 816 | |
| 817 | ret = of_alias_get_id(np, "serial"); |
| 818 | if (ret < 0) { |
| 819 | dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); |
| 820 | return ret; |
| 821 | } |
| 822 | sport->port.line = ret; |
| 823 | return 0; |
| 824 | } |
| 825 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 826 | static int serial_pxa_probe(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | { |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 828 | struct uart_pxa_port *sport; |
| 829 | struct resource *mmres, *irqres; |
| 830 | int ret; |
| 831 | |
| 832 | mmres = platform_get_resource(dev, IORESOURCE_MEM, 0); |
| 833 | irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0); |
| 834 | if (!mmres || !irqres) |
| 835 | return -ENODEV; |
| 836 | |
| 837 | sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL); |
| 838 | if (!sport) |
| 839 | return -ENOMEM; |
| 840 | |
Russell King | e0d8b13 | 2008-11-11 17:52:32 +0000 | [diff] [blame] | 841 | sport->clk = clk_get(&dev->dev, NULL); |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 842 | if (IS_ERR(sport->clk)) { |
| 843 | ret = PTR_ERR(sport->clk); |
| 844 | goto err_free; |
| 845 | } |
| 846 | |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 847 | sport->port.type = PORT_PXA; |
| 848 | sport->port.iotype = UPIO_MEM; |
| 849 | sport->port.mapbase = mmres->start; |
| 850 | sport->port.irq = irqres->start; |
| 851 | sport->port.fifosize = 64; |
| 852 | sport->port.ops = &serial_pxa_pops; |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 853 | sport->port.dev = &dev->dev; |
| 854 | sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF; |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 855 | sport->port.uartclk = clk_get_rate(sport->clk); |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 856 | |
Haojian Zhuang | 699c20f | 2012-02-29 16:09:05 +0800 | [diff] [blame] | 857 | ret = serial_pxa_probe_dt(dev, sport); |
| 858 | if (ret > 0) |
| 859 | sport->port.line = dev->id; |
| 860 | else if (ret < 0) |
| 861 | goto err_clk; |
| 862 | snprintf(sport->name, PXA_NAME_LEN - 1, "UART%d", sport->port.line + 1); |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 863 | |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 864 | sport->port.membase = ioremap(mmres->start, resource_size(mmres)); |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 865 | if (!sport->port.membase) { |
| 866 | ret = -ENOMEM; |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 867 | goto err_clk; |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 868 | } |
| 869 | |
Haojian Zhuang | 699c20f | 2012-02-29 16:09:05 +0800 | [diff] [blame] | 870 | serial_pxa_ports[sport->port.line] = sport; |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 871 | |
| 872 | uart_add_one_port(&serial_pxa_reg, &sport->port); |
| 873 | platform_set_drvdata(dev, sport); |
| 874 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | return 0; |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 876 | |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 877 | err_clk: |
| 878 | clk_put(sport->clk); |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 879 | err_free: |
| 880 | kfree(sport); |
| 881 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | } |
| 883 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 884 | static int serial_pxa_remove(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 886 | struct uart_pxa_port *sport = platform_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 888 | platform_set_drvdata(dev, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 890 | uart_remove_one_port(&serial_pxa_reg, &sport->port); |
Russell King | b049bd9 | 2007-08-20 10:28:15 +0100 | [diff] [blame] | 891 | clk_put(sport->clk); |
Russell King | e259a3a | 2007-08-20 09:47:41 +0100 | [diff] [blame] | 892 | kfree(sport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | |
| 894 | return 0; |
| 895 | } |
| 896 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 897 | static struct platform_driver serial_pxa_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | .probe = serial_pxa_probe, |
| 899 | .remove = serial_pxa_remove, |
| 900 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 901 | .driver = { |
| 902 | .name = "pxa2xx-uart", |
Kay Sievers | e169c13 | 2008-04-15 14:34:35 -0700 | [diff] [blame] | 903 | .owner = THIS_MODULE, |
Mike Rapoport | bf56c75 | 2009-07-21 17:48:43 +0300 | [diff] [blame] | 904 | #ifdef CONFIG_PM |
| 905 | .pm = &serial_pxa_pm_ops, |
| 906 | #endif |
Haojian Zhuang | 699c20f | 2012-02-29 16:09:05 +0800 | [diff] [blame] | 907 | .of_match_table = serial_pxa_dt_ids, |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 908 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | }; |
| 910 | |
| 911 | int __init serial_pxa_init(void) |
| 912 | { |
| 913 | int ret; |
| 914 | |
| 915 | ret = uart_register_driver(&serial_pxa_reg); |
| 916 | if (ret != 0) |
| 917 | return ret; |
| 918 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 919 | ret = platform_driver_register(&serial_pxa_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | if (ret != 0) |
| 921 | uart_unregister_driver(&serial_pxa_reg); |
| 922 | |
| 923 | return ret; |
| 924 | } |
| 925 | |
| 926 | void __exit serial_pxa_exit(void) |
| 927 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 928 | platform_driver_unregister(&serial_pxa_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | uart_unregister_driver(&serial_pxa_reg); |
| 930 | } |
| 931 | |
| 932 | module_init(serial_pxa_init); |
| 933 | module_exit(serial_pxa_exit); |
| 934 | |
| 935 | MODULE_LICENSE("GPL"); |
Kay Sievers | e169c13 | 2008-04-15 14:34:35 -0700 | [diff] [blame] | 936 | MODULE_ALIAS("platform:pxa2xx-uart"); |