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Andrew Victor1e6c9c22006-01-10 16:59:27 +00001/*
Andrew Victorc2f5ccf2006-12-04 09:37:20 +01002 * linux/drivers/char/atmel_serial.c
Andrew Victor1e6c9c22006-01-10 16:59:27 +00003 *
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02004 * Driver for Atmel AT91 / AT32 Serial ports
Andrew Victor1e6c9c22006-01-10 16:59:27 +00005 * Copyright (C) 2003 Rick Bronson
6 *
7 * Based on drivers/char/serial_sa1100.c, by Deep Blue Solutions Ltd.
8 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
9 *
Chip Coldwella6670612008-02-08 04:21:06 -080010 * DMA support added by Chip Coldwell.
11 *
Andrew Victor1e6c9c22006-01-10 16:59:27 +000012 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 *
26 */
Andrew Victor1e6c9c22006-01-10 16:59:27 +000027#include <linux/module.h>
28#include <linux/tty.h>
29#include <linux/ioport.h>
30#include <linux/slab.h>
31#include <linux/init.h>
32#include <linux/serial.h>
Andrew Victorafefc412006-06-19 19:53:19 +010033#include <linux/clk.h>
Andrew Victor1e6c9c22006-01-10 16:59:27 +000034#include <linux/console.h>
35#include <linux/sysrq.h>
36#include <linux/tty_flip.h>
Andrew Victorafefc412006-06-19 19:53:19 +010037#include <linux/platform_device.h>
Chip Coldwella6670612008-02-08 04:21:06 -080038#include <linux/dma-mapping.h>
Andrew Victor93a3ddc2007-02-08 11:31:22 +010039#include <linux/atmel_pdc.h>
Guennadi Liakhovetskifa3218d2008-01-29 15:43:13 +010040#include <linux/atmel_serial.h>
Claudio Scordinoe8faff72010-05-03 13:31:28 +010041#include <linux/uaccess.h>
Andrew Victor1e6c9c22006-01-10 16:59:27 +000042
43#include <asm/io.h>
Peter Huewef7512e72010-06-29 19:35:39 +020044#include <asm/ioctls.h>
Andrew Victor1e6c9c22006-01-10 16:59:27 +000045
Andrew Victorafefc412006-06-19 19:53:19 +010046#include <asm/mach/serial_at91.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010047#include <mach/board.h>
Andrew Victor93a3ddc2007-02-08 11:31:22 +010048
Haavard Skinnemoenacca9b82006-10-04 16:02:09 +020049#ifdef CONFIG_ARM
Russell Kinga09e64f2008-08-05 16:14:15 +010050#include <mach/cpu.h>
51#include <mach/gpio.h>
Haavard Skinnemoenacca9b82006-10-04 16:02:09 +020052#endif
Andrew Victor1e6c9c22006-01-10 16:59:27 +000053
Chip Coldwella6670612008-02-08 04:21:06 -080054#define PDC_BUFFER_SIZE 512
55/* Revisit: We should calculate this based on the actual port settings */
56#define PDC_RX_TIMEOUT (3 * 10) /* 3 bytes */
57
Haavard Skinnemoen749c4e62006-10-04 16:02:02 +020058#if defined(CONFIG_SERIAL_ATMEL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
Andrew Victor1e6c9c22006-01-10 16:59:27 +000059#define SUPPORT_SYSRQ
60#endif
61
62#include <linux/serial_core.h>
63
Claudio Scordinoe8faff72010-05-03 13:31:28 +010064static void atmel_start_rx(struct uart_port *port);
65static void atmel_stop_rx(struct uart_port *port);
66
Haavard Skinnemoen749c4e62006-10-04 16:02:02 +020067#ifdef CONFIG_SERIAL_ATMEL_TTYAT
Andrew Victor1e6c9c22006-01-10 16:59:27 +000068
69/* Use device name ttyAT, major 204 and minor 154-169. This is necessary if we
70 * should coexist with the 8250 driver, such as if we have an external 16C550
71 * UART. */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +020072#define SERIAL_ATMEL_MAJOR 204
Andrew Victor1e6c9c22006-01-10 16:59:27 +000073#define MINOR_START 154
Haavard Skinnemoen7192f922006-10-04 16:02:05 +020074#define ATMEL_DEVICENAME "ttyAT"
Andrew Victor1e6c9c22006-01-10 16:59:27 +000075
76#else
77
78/* Use device name ttyS, major 4, minor 64-68. This is the usual serial port
79 * name, but it is legally reserved for the 8250 driver. */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +020080#define SERIAL_ATMEL_MAJOR TTY_MAJOR
Andrew Victor1e6c9c22006-01-10 16:59:27 +000081#define MINOR_START 64
Haavard Skinnemoen7192f922006-10-04 16:02:05 +020082#define ATMEL_DEVICENAME "ttyS"
Andrew Victor1e6c9c22006-01-10 16:59:27 +000083
84#endif
85
Haavard Skinnemoen7192f922006-10-04 16:02:05 +020086#define ATMEL_ISR_PASS_LIMIT 256
Andrew Victor1e6c9c22006-01-10 16:59:27 +000087
Remy Bohmerb843aa22008-02-08 04:21:01 -080088/* UART registers. CR is write-only, hence no GET macro */
Haavard Skinnemoen544fc722007-02-12 00:52:15 -080089#define UART_PUT_CR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_CR)
90#define UART_GET_MR(port) __raw_readl((port)->membase + ATMEL_US_MR)
91#define UART_PUT_MR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_MR)
92#define UART_PUT_IER(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IER)
93#define UART_PUT_IDR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_IDR)
94#define UART_GET_IMR(port) __raw_readl((port)->membase + ATMEL_US_IMR)
95#define UART_GET_CSR(port) __raw_readl((port)->membase + ATMEL_US_CSR)
96#define UART_GET_CHAR(port) __raw_readl((port)->membase + ATMEL_US_RHR)
97#define UART_PUT_CHAR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_THR)
98#define UART_GET_BRGR(port) __raw_readl((port)->membase + ATMEL_US_BRGR)
99#define UART_PUT_BRGR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_BRGR)
100#define UART_PUT_RTOR(port,v) __raw_writel(v, (port)->membase + ATMEL_US_RTOR)
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100101#define UART_PUT_TTGR(port, v) __raw_writel(v, (port)->membase + ATMEL_US_TTGR)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000102
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000103 /* PDC registers */
Haavard Skinnemoen544fc722007-02-12 00:52:15 -0800104#define UART_PUT_PTCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_PTCR)
105#define UART_GET_PTSR(port) __raw_readl((port)->membase + ATMEL_PDC_PTSR)
Andrew Victorafefc412006-06-19 19:53:19 +0100106
Haavard Skinnemoen544fc722007-02-12 00:52:15 -0800107#define UART_PUT_RPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RPR)
108#define UART_GET_RPR(port) __raw_readl((port)->membase + ATMEL_PDC_RPR)
109#define UART_PUT_RCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RCR)
110#define UART_PUT_RNPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNPR)
111#define UART_PUT_RNCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_RNCR)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000112
Haavard Skinnemoen544fc722007-02-12 00:52:15 -0800113#define UART_PUT_TPR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TPR)
114#define UART_PUT_TCR(port,v) __raw_writel(v, (port)->membase + ATMEL_PDC_TCR)
Marc Pignat39d4c922008-04-02 13:04:42 -0700115#define UART_GET_TCR(port) __raw_readl((port)->membase + ATMEL_PDC_TCR)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000116
Haavard Skinnemoen71f2e2b2006-10-04 16:02:07 +0200117static int (*atmel_open_hook)(struct uart_port *);
118static void (*atmel_close_hook)(struct uart_port *);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000119
Chip Coldwella6670612008-02-08 04:21:06 -0800120struct atmel_dma_buffer {
121 unsigned char *buf;
122 dma_addr_t dma_addr;
123 unsigned int dma_size;
124 unsigned int ofs;
125};
126
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800127struct atmel_uart_char {
128 u16 status;
129 u16 ch;
130};
131
132#define ATMEL_SERIAL_RINGSIZE 1024
133
Andrew Victorafefc412006-06-19 19:53:19 +0100134/*
135 * We wrap our port structure around the generic uart_port.
136 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200137struct atmel_uart_port {
Andrew Victorafefc412006-06-19 19:53:19 +0100138 struct uart_port uart; /* uart */
139 struct clk *clk; /* uart clock */
Anti Sullinf05596d2008-09-22 13:57:54 -0700140 int may_wakeup; /* cached value of device_may_wakeup for times we need to disable it */
141 u32 backup_imr; /* IMR saved during suspend */
Haavard Skinnemoen9e6077b2007-07-15 23:40:36 -0700142 int break_active; /* break being received */
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800143
Chip Coldwella6670612008-02-08 04:21:06 -0800144 short use_dma_rx; /* enable PDC receiver */
145 short pdc_rx_idx; /* current PDC RX buffer */
146 struct atmel_dma_buffer pdc_rx[2]; /* PDC receier */
147
148 short use_dma_tx; /* enable PDC transmitter */
149 struct atmel_dma_buffer pdc_tx; /* PDC transmitter */
150
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800151 struct tasklet_struct tasklet;
152 unsigned int irq_status;
153 unsigned int irq_status_prev;
154
155 struct circ_buf rx_ring;
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100156
157 struct serial_rs485 rs485; /* rs485 settings */
158 unsigned int tx_done_mask;
Andrew Victorafefc412006-06-19 19:53:19 +0100159};
160
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200161static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
Andrew Victorafefc412006-06-19 19:53:19 +0100162
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000163#ifdef SUPPORT_SYSRQ
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200164static struct console atmel_console;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000165#endif
166
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800167static inline struct atmel_uart_port *
168to_atmel_uart_port(struct uart_port *uart)
169{
170 return container_of(uart, struct atmel_uart_port, uart);
171}
172
Chip Coldwella6670612008-02-08 04:21:06 -0800173#ifdef CONFIG_SERIAL_ATMEL_PDC
174static bool atmel_use_dma_rx(struct uart_port *port)
175{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800176 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Chip Coldwella6670612008-02-08 04:21:06 -0800177
178 return atmel_port->use_dma_rx;
179}
180
181static bool atmel_use_dma_tx(struct uart_port *port)
182{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800183 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Chip Coldwella6670612008-02-08 04:21:06 -0800184
185 return atmel_port->use_dma_tx;
186}
187#else
188static bool atmel_use_dma_rx(struct uart_port *port)
189{
190 return false;
191}
192
193static bool atmel_use_dma_tx(struct uart_port *port)
194{
195 return false;
196}
197#endif
198
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100199/* Enable or disable the rs485 support */
200void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
201{
202 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
203 unsigned int mode;
204
205 spin_lock(&port->lock);
206
207 /* Disable interrupts */
208 UART_PUT_IDR(port, atmel_port->tx_done_mask);
209
210 mode = UART_GET_MR(port);
211
212 /* Resetting serial mode to RS232 (0x0) */
213 mode &= ~ATMEL_US_USMODE;
214
215 atmel_port->rs485 = *rs485conf;
216
217 if (rs485conf->flags & SER_RS485_ENABLED) {
218 dev_dbg(port->dev, "Setting UART to RS485\n");
219 atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
Claudio Scordino1b633182010-07-20 15:26:47 -0700220 if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND)
221 UART_PUT_TTGR(port, rs485conf->delay_rts_after_send);
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100222 mode |= ATMEL_US_USMODE_RS485;
223 } else {
224 dev_dbg(port->dev, "Setting UART to RS232\n");
225 if (atmel_use_dma_tx(port))
226 atmel_port->tx_done_mask = ATMEL_US_ENDTX |
227 ATMEL_US_TXBUFE;
228 else
229 atmel_port->tx_done_mask = ATMEL_US_TXRDY;
230 }
231 UART_PUT_MR(port, mode);
232
233 /* Enable interrupts */
234 UART_PUT_IER(port, atmel_port->tx_done_mask);
235
236 spin_unlock(&port->lock);
237
238}
239
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000240/*
241 * Return TIOCSER_TEMT when transmitter FIFO and Shift register is empty.
242 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200243static u_int atmel_tx_empty(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000244{
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200245 return (UART_GET_CSR(port) & ATMEL_US_TXEMPTY) ? TIOCSER_TEMT : 0;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000246}
247
248/*
249 * Set state of the modem control output lines
250 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200251static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000252{
253 unsigned int control = 0;
Andrew Victorafefc412006-06-19 19:53:19 +0100254 unsigned int mode;
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100255 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000256
Andrew Victorc2f5ccf2006-12-04 09:37:20 +0100257#ifdef CONFIG_ARCH_AT91RM9200
Andrew Victor79da7a62006-11-30 11:58:14 +0100258 if (cpu_is_at91rm9200()) {
Andrew Victorafefc412006-06-19 19:53:19 +0100259 /*
Remy Bohmerb843aa22008-02-08 04:21:01 -0800260 * AT91RM9200 Errata #39: RTS0 is not internally connected
261 * to PA21. We need to drive the pin manually.
Andrew Victorafefc412006-06-19 19:53:19 +0100262 */
Andrew Victor72729912006-09-27 09:44:11 +0100263 if (port->mapbase == AT91RM9200_BASE_US0) {
Andrew Victorafefc412006-06-19 19:53:19 +0100264 if (mctrl & TIOCM_RTS)
Andrew Victor20e65272006-07-05 14:31:13 +0100265 at91_set_gpio_value(AT91_PIN_PA21, 0);
Andrew Victorafefc412006-06-19 19:53:19 +0100266 else
Andrew Victor20e65272006-07-05 14:31:13 +0100267 at91_set_gpio_value(AT91_PIN_PA21, 1);
Andrew Victorafefc412006-06-19 19:53:19 +0100268 }
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000269 }
Haavard Skinnemoenacca9b82006-10-04 16:02:09 +0200270#endif
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000271
272 if (mctrl & TIOCM_RTS)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200273 control |= ATMEL_US_RTSEN;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000274 else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200275 control |= ATMEL_US_RTSDIS;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000276
277 if (mctrl & TIOCM_DTR)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200278 control |= ATMEL_US_DTREN;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000279 else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200280 control |= ATMEL_US_DTRDIS;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000281
Andrew Victorafefc412006-06-19 19:53:19 +0100282 UART_PUT_CR(port, control);
283
284 /* Local loopback mode? */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200285 mode = UART_GET_MR(port) & ~ATMEL_US_CHMODE;
Andrew Victorafefc412006-06-19 19:53:19 +0100286 if (mctrl & TIOCM_LOOP)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200287 mode |= ATMEL_US_CHMODE_LOC_LOOP;
Andrew Victorafefc412006-06-19 19:53:19 +0100288 else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200289 mode |= ATMEL_US_CHMODE_NORMAL;
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100290
291 /* Resetting serial mode to RS232 (0x0) */
292 mode &= ~ATMEL_US_USMODE;
293
294 if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
295 dev_dbg(port->dev, "Setting UART to RS485\n");
Claudio Scordino1b633182010-07-20 15:26:47 -0700296 if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
297 UART_PUT_TTGR(port,
298 atmel_port->rs485.delay_rts_after_send);
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100299 mode |= ATMEL_US_USMODE_RS485;
300 } else {
301 dev_dbg(port->dev, "Setting UART to RS232\n");
302 }
Andrew Victorafefc412006-06-19 19:53:19 +0100303 UART_PUT_MR(port, mode);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000304}
305
306/*
307 * Get state of the modem control input lines
308 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200309static u_int atmel_get_mctrl(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000310{
311 unsigned int status, ret = 0;
312
313 status = UART_GET_CSR(port);
314
315 /*
316 * The control signals are active low.
317 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200318 if (!(status & ATMEL_US_DCD))
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000319 ret |= TIOCM_CD;
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200320 if (!(status & ATMEL_US_CTS))
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000321 ret |= TIOCM_CTS;
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200322 if (!(status & ATMEL_US_DSR))
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000323 ret |= TIOCM_DSR;
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200324 if (!(status & ATMEL_US_RI))
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000325 ret |= TIOCM_RI;
326
327 return ret;
328}
329
330/*
331 * Stop transmitting.
332 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200333static void atmel_stop_tx(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000334{
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100335 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
336
Chip Coldwella6670612008-02-08 04:21:06 -0800337 if (atmel_use_dma_tx(port)) {
338 /* disable PDC transmit */
339 UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100340 }
341 /* Disable interrupts */
342 UART_PUT_IDR(port, atmel_port->tx_done_mask);
343
344 if (atmel_port->rs485.flags & SER_RS485_ENABLED)
345 atmel_start_rx(port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000346}
347
348/*
349 * Start transmitting.
350 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200351static void atmel_start_tx(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000352{
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100353 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
354
Chip Coldwella6670612008-02-08 04:21:06 -0800355 if (atmel_use_dma_tx(port)) {
356 if (UART_GET_PTSR(port) & ATMEL_PDC_TXTEN)
357 /* The transmitter is already running. Yes, we
358 really need this.*/
359 return;
360
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100361 if (atmel_port->rs485.flags & SER_RS485_ENABLED)
362 atmel_stop_rx(port);
363
Chip Coldwella6670612008-02-08 04:21:06 -0800364 /* re-enable PDC transmit */
365 UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100366 }
367 /* Enable interrupts */
368 UART_PUT_IER(port, atmel_port->tx_done_mask);
369}
370
371/*
372 * start receiving - port is in process of being opened.
373 */
374static void atmel_start_rx(struct uart_port *port)
375{
376 UART_PUT_CR(port, ATMEL_US_RSTSTA); /* reset status and receiver */
377
378 if (atmel_use_dma_rx(port)) {
379 /* enable PDC controller */
380 UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
381 port->read_status_mask);
382 UART_PUT_PTCR(port, ATMEL_PDC_RXTEN);
383 } else {
384 UART_PUT_IER(port, ATMEL_US_RXRDY);
385 }
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000386}
387
388/*
389 * Stop receiving - port is in process of being closed.
390 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200391static void atmel_stop_rx(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000392{
Chip Coldwella6670612008-02-08 04:21:06 -0800393 if (atmel_use_dma_rx(port)) {
394 /* disable PDC receive */
395 UART_PUT_PTCR(port, ATMEL_PDC_RXTDIS);
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100396 UART_PUT_IDR(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT |
397 port->read_status_mask);
398 } else {
Chip Coldwella6670612008-02-08 04:21:06 -0800399 UART_PUT_IDR(port, ATMEL_US_RXRDY);
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100400 }
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000401}
402
403/*
404 * Enable modem status interrupts
405 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200406static void atmel_enable_ms(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000407{
Remy Bohmerb843aa22008-02-08 04:21:01 -0800408 UART_PUT_IER(port, ATMEL_US_RIIC | ATMEL_US_DSRIC
409 | ATMEL_US_DCDIC | ATMEL_US_CTSIC);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000410}
411
412/*
413 * Control the transmission of a break signal
414 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200415static void atmel_break_ctl(struct uart_port *port, int break_state)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000416{
417 if (break_state != 0)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200418 UART_PUT_CR(port, ATMEL_US_STTBRK); /* start break */
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000419 else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200420 UART_PUT_CR(port, ATMEL_US_STPBRK); /* stop break */
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000421}
422
423/*
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800424 * Stores the incoming character in the ring buffer
425 */
426static void
427atmel_buffer_rx_char(struct uart_port *port, unsigned int status,
428 unsigned int ch)
429{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800430 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800431 struct circ_buf *ring = &atmel_port->rx_ring;
432 struct atmel_uart_char *c;
433
434 if (!CIRC_SPACE(ring->head, ring->tail, ATMEL_SERIAL_RINGSIZE))
435 /* Buffer overflow, ignore char */
436 return;
437
438 c = &((struct atmel_uart_char *)ring->buf)[ring->head];
439 c->status = status;
440 c->ch = ch;
441
442 /* Make sure the character is stored before we update head. */
443 smp_wmb();
444
445 ring->head = (ring->head + 1) & (ATMEL_SERIAL_RINGSIZE - 1);
446}
447
448/*
Chip Coldwella6670612008-02-08 04:21:06 -0800449 * Deal with parity, framing and overrun errors.
450 */
451static void atmel_pdc_rxerr(struct uart_port *port, unsigned int status)
452{
453 /* clear error */
454 UART_PUT_CR(port, ATMEL_US_RSTSTA);
455
456 if (status & ATMEL_US_RXBRK) {
457 /* ignore side-effect */
458 status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME);
459 port->icount.brk++;
460 }
461 if (status & ATMEL_US_PARE)
462 port->icount.parity++;
463 if (status & ATMEL_US_FRAME)
464 port->icount.frame++;
465 if (status & ATMEL_US_OVRE)
466 port->icount.overrun++;
467}
468
469/*
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000470 * Characters received (called from interrupt handler)
471 */
David Howells7d12e782006-10-05 14:55:46 +0100472static void atmel_rx_chars(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000473{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800474 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800475 unsigned int status, ch;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000476
Andrew Victorafefc412006-06-19 19:53:19 +0100477 status = UART_GET_CSR(port);
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200478 while (status & ATMEL_US_RXRDY) {
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000479 ch = UART_GET_CHAR(port);
480
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000481 /*
482 * note that the error handling code is
483 * out of the main execution path
484 */
Haavard Skinnemoen9e6077b2007-07-15 23:40:36 -0700485 if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME
486 | ATMEL_US_OVRE | ATMEL_US_RXBRK)
487 || atmel_port->break_active)) {
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800488
Remy Bohmerb843aa22008-02-08 04:21:01 -0800489 /* clear error */
490 UART_PUT_CR(port, ATMEL_US_RSTSTA);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800491
Haavard Skinnemoen9e6077b2007-07-15 23:40:36 -0700492 if (status & ATMEL_US_RXBRK
493 && !atmel_port->break_active) {
Haavard Skinnemoen9e6077b2007-07-15 23:40:36 -0700494 atmel_port->break_active = 1;
495 UART_PUT_IER(port, ATMEL_US_RXBRK);
Haavard Skinnemoen9e6077b2007-07-15 23:40:36 -0700496 } else {
497 /*
498 * This is either the end-of-break
499 * condition or we've received at
500 * least one character without RXBRK
501 * being set. In both cases, the next
502 * RXBRK will indicate start-of-break.
503 */
504 UART_PUT_IDR(port, ATMEL_US_RXBRK);
505 status &= ~ATMEL_US_RXBRK;
506 atmel_port->break_active = 0;
Andrew Victorafefc412006-06-19 19:53:19 +0100507 }
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000508 }
509
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800510 atmel_buffer_rx_char(port, status, ch);
Andrew Victorafefc412006-06-19 19:53:19 +0100511 status = UART_GET_CSR(port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000512 }
513
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800514 tasklet_schedule(&atmel_port->tasklet);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000515}
516
517/*
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800518 * Transmit characters (called from tasklet with TXRDY interrupt
519 * disabled)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000520 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200521static void atmel_tx_chars(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000522{
Alan Coxebd2c8f2009-09-19 13:13:28 -0700523 struct circ_buf *xmit = &port->state->xmit;
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100524 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000525
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100526 if (port->x_char && UART_GET_CSR(port) & atmel_port->tx_done_mask) {
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000527 UART_PUT_CHAR(port, port->x_char);
528 port->icount.tx++;
529 port->x_char = 0;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000530 }
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800531 if (uart_circ_empty(xmit) || uart_tx_stopped(port))
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000532 return;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000533
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100534 while (UART_GET_CSR(port) & atmel_port->tx_done_mask) {
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000535 UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
536 xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
537 port->icount.tx++;
538 if (uart_circ_empty(xmit))
539 break;
540 }
541
542 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
543 uart_write_wakeup(port);
544
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800545 if (!uart_circ_empty(xmit))
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100546 /* Enable interrupts */
547 UART_PUT_IER(port, atmel_port->tx_done_mask);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000548}
549
550/*
Remy Bohmerb843aa22008-02-08 04:21:01 -0800551 * receive interrupt handler.
552 */
553static void
554atmel_handle_receive(struct uart_port *port, unsigned int pending)
555{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800556 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Remy Bohmerb843aa22008-02-08 04:21:01 -0800557
Chip Coldwella6670612008-02-08 04:21:06 -0800558 if (atmel_use_dma_rx(port)) {
559 /*
560 * PDC receive. Just schedule the tasklet and let it
561 * figure out the details.
562 *
563 * TODO: We're not handling error flags correctly at
564 * the moment.
565 */
566 if (pending & (ATMEL_US_ENDRX | ATMEL_US_TIMEOUT)) {
567 UART_PUT_IDR(port, (ATMEL_US_ENDRX
568 | ATMEL_US_TIMEOUT));
569 tasklet_schedule(&atmel_port->tasklet);
570 }
571
572 if (pending & (ATMEL_US_RXBRK | ATMEL_US_OVRE |
573 ATMEL_US_FRAME | ATMEL_US_PARE))
574 atmel_pdc_rxerr(port, pending);
575 }
576
Remy Bohmerb843aa22008-02-08 04:21:01 -0800577 /* Interrupt receive */
578 if (pending & ATMEL_US_RXRDY)
579 atmel_rx_chars(port);
580 else if (pending & ATMEL_US_RXBRK) {
581 /*
582 * End of break detected. If it came along with a
583 * character, atmel_rx_chars will handle it.
584 */
585 UART_PUT_CR(port, ATMEL_US_RSTSTA);
586 UART_PUT_IDR(port, ATMEL_US_RXBRK);
587 atmel_port->break_active = 0;
588 }
589}
590
591/*
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800592 * transmit interrupt handler. (Transmit is IRQF_NODELAY safe)
Remy Bohmerb843aa22008-02-08 04:21:01 -0800593 */
594static void
595atmel_handle_transmit(struct uart_port *port, unsigned int pending)
596{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800597 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800598
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100599 if (pending & atmel_port->tx_done_mask) {
600 /* Either PDC or interrupt transmission */
601 UART_PUT_IDR(port, atmel_port->tx_done_mask);
602 tasklet_schedule(&atmel_port->tasklet);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800603 }
Remy Bohmerb843aa22008-02-08 04:21:01 -0800604}
605
606/*
607 * status flags interrupt handler.
608 */
609static void
610atmel_handle_status(struct uart_port *port, unsigned int pending,
611 unsigned int status)
612{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800613 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800614
Remy Bohmerb843aa22008-02-08 04:21:01 -0800615 if (pending & (ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800616 | ATMEL_US_CTSIC)) {
617 atmel_port->irq_status = status;
618 tasklet_schedule(&atmel_port->tasklet);
619 }
Remy Bohmerb843aa22008-02-08 04:21:01 -0800620}
621
622/*
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000623 * Interrupt handler
624 */
David Howells7d12e782006-10-05 14:55:46 +0100625static irqreturn_t atmel_interrupt(int irq, void *dev_id)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000626{
627 struct uart_port *port = dev_id;
628 unsigned int status, pending, pass_counter = 0;
629
Chip Coldwella6670612008-02-08 04:21:06 -0800630 do {
631 status = UART_GET_CSR(port);
632 pending = status & UART_GET_IMR(port);
633 if (!pending)
634 break;
635
Remy Bohmerb843aa22008-02-08 04:21:01 -0800636 atmel_handle_receive(port, pending);
637 atmel_handle_status(port, pending, status);
638 atmel_handle_transmit(port, pending);
Chip Coldwella6670612008-02-08 04:21:06 -0800639 } while (pass_counter++ < ATMEL_ISR_PASS_LIMIT);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000640
Haavard Skinnemoen0400b692008-02-23 15:23:36 -0800641 return pass_counter ? IRQ_HANDLED : IRQ_NONE;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000642}
643
Chip Coldwella6670612008-02-08 04:21:06 -0800644/*
645 * Called from tasklet with ENDTX and TXBUFE interrupts disabled.
646 */
647static void atmel_tx_dma(struct uart_port *port)
648{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800649 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Alan Coxebd2c8f2009-09-19 13:13:28 -0700650 struct circ_buf *xmit = &port->state->xmit;
Chip Coldwella6670612008-02-08 04:21:06 -0800651 struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
652 int count;
653
Michael Trimarchiba0657f2008-04-02 13:04:41 -0700654 /* nothing left to transmit? */
655 if (UART_GET_TCR(port))
656 return;
657
Chip Coldwella6670612008-02-08 04:21:06 -0800658 xmit->tail += pdc->ofs;
659 xmit->tail &= UART_XMIT_SIZE - 1;
660
661 port->icount.tx += pdc->ofs;
662 pdc->ofs = 0;
663
Michael Trimarchiba0657f2008-04-02 13:04:41 -0700664 /* more to transmit - setup next transfer */
Chip Coldwella6670612008-02-08 04:21:06 -0800665
Michael Trimarchiba0657f2008-04-02 13:04:41 -0700666 /* disable PDC transmit */
667 UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
668
Itai Levi1f140812009-01-15 13:50:43 -0800669 if (!uart_circ_empty(xmit) && !uart_tx_stopped(port)) {
Chip Coldwella6670612008-02-08 04:21:06 -0800670 dma_sync_single_for_device(port->dev,
671 pdc->dma_addr,
672 pdc->dma_size,
673 DMA_TO_DEVICE);
674
675 count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
676 pdc->ofs = count;
677
678 UART_PUT_TPR(port, pdc->dma_addr + xmit->tail);
679 UART_PUT_TCR(port, count);
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100680 /* re-enable PDC transmit */
Chip Coldwella6670612008-02-08 04:21:06 -0800681 UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
Claudio Scordinoe8faff72010-05-03 13:31:28 +0100682 /* Enable interrupts */
683 UART_PUT_IER(port, atmel_port->tx_done_mask);
684 } else {
685 if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
686 /* DMA done, stop TX, start RX for RS485 */
687 atmel_start_rx(port);
688 }
Chip Coldwella6670612008-02-08 04:21:06 -0800689 }
690
691 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
692 uart_write_wakeup(port);
693}
694
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800695static void atmel_rx_from_ring(struct uart_port *port)
696{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800697 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800698 struct circ_buf *ring = &atmel_port->rx_ring;
699 unsigned int flg;
700 unsigned int status;
701
702 while (ring->head != ring->tail) {
703 struct atmel_uart_char c;
704
705 /* Make sure c is loaded after head. */
706 smp_rmb();
707
708 c = ((struct atmel_uart_char *)ring->buf)[ring->tail];
709
710 ring->tail = (ring->tail + 1) & (ATMEL_SERIAL_RINGSIZE - 1);
711
712 port->icount.rx++;
713 status = c.status;
714 flg = TTY_NORMAL;
715
716 /*
717 * note that the error handling code is
718 * out of the main execution path
719 */
720 if (unlikely(status & (ATMEL_US_PARE | ATMEL_US_FRAME
721 | ATMEL_US_OVRE | ATMEL_US_RXBRK))) {
722 if (status & ATMEL_US_RXBRK) {
723 /* ignore side-effect */
724 status &= ~(ATMEL_US_PARE | ATMEL_US_FRAME);
725
726 port->icount.brk++;
727 if (uart_handle_break(port))
728 continue;
729 }
730 if (status & ATMEL_US_PARE)
731 port->icount.parity++;
732 if (status & ATMEL_US_FRAME)
733 port->icount.frame++;
734 if (status & ATMEL_US_OVRE)
735 port->icount.overrun++;
736
737 status &= port->read_status_mask;
738
739 if (status & ATMEL_US_RXBRK)
740 flg = TTY_BREAK;
741 else if (status & ATMEL_US_PARE)
742 flg = TTY_PARITY;
743 else if (status & ATMEL_US_FRAME)
744 flg = TTY_FRAME;
745 }
746
747
748 if (uart_handle_sysrq_char(port, c.ch))
749 continue;
750
751 uart_insert_char(port, status, ATMEL_US_OVRE, c.ch, flg);
752 }
753
754 /*
755 * Drop the lock here since it might end up calling
756 * uart_start(), which takes the lock.
757 */
758 spin_unlock(&port->lock);
Alan Coxebd2c8f2009-09-19 13:13:28 -0700759 tty_flip_buffer_push(port->state->port.tty);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800760 spin_lock(&port->lock);
761}
762
Chip Coldwella6670612008-02-08 04:21:06 -0800763static void atmel_rx_from_dma(struct uart_port *port)
764{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800765 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Alan Coxebd2c8f2009-09-19 13:13:28 -0700766 struct tty_struct *tty = port->state->port.tty;
Chip Coldwella6670612008-02-08 04:21:06 -0800767 struct atmel_dma_buffer *pdc;
768 int rx_idx = atmel_port->pdc_rx_idx;
769 unsigned int head;
770 unsigned int tail;
771 unsigned int count;
772
773 do {
774 /* Reset the UART timeout early so that we don't miss one */
775 UART_PUT_CR(port, ATMEL_US_STTTO);
776
777 pdc = &atmel_port->pdc_rx[rx_idx];
778 head = UART_GET_RPR(port) - pdc->dma_addr;
779 tail = pdc->ofs;
780
781 /* If the PDC has switched buffers, RPR won't contain
782 * any address within the current buffer. Since head
783 * is unsigned, we just need a one-way comparison to
784 * find out.
785 *
786 * In this case, we just need to consume the entire
787 * buffer and resubmit it for DMA. This will clear the
788 * ENDRX bit as well, so that we can safely re-enable
789 * all interrupts below.
790 */
791 head = min(head, pdc->dma_size);
792
793 if (likely(head != tail)) {
794 dma_sync_single_for_cpu(port->dev, pdc->dma_addr,
795 pdc->dma_size, DMA_FROM_DEVICE);
796
797 /*
798 * head will only wrap around when we recycle
799 * the DMA buffer, and when that happens, we
800 * explicitly set tail to 0. So head will
801 * always be greater than tail.
802 */
803 count = head - tail;
804
805 tty_insert_flip_string(tty, pdc->buf + pdc->ofs, count);
806
807 dma_sync_single_for_device(port->dev, pdc->dma_addr,
808 pdc->dma_size, DMA_FROM_DEVICE);
809
810 port->icount.rx += count;
811 pdc->ofs = head;
812 }
813
814 /*
815 * If the current buffer is full, we need to check if
816 * the next one contains any additional data.
817 */
818 if (head >= pdc->dma_size) {
819 pdc->ofs = 0;
820 UART_PUT_RNPR(port, pdc->dma_addr);
821 UART_PUT_RNCR(port, pdc->dma_size);
822
823 rx_idx = !rx_idx;
824 atmel_port->pdc_rx_idx = rx_idx;
825 }
826 } while (head >= pdc->dma_size);
827
828 /*
829 * Drop the lock here since it might end up calling
830 * uart_start(), which takes the lock.
831 */
832 spin_unlock(&port->lock);
833 tty_flip_buffer_push(tty);
834 spin_lock(&port->lock);
835
836 UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
837}
838
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800839/*
840 * tasklet handling tty stuff outside the interrupt handler.
841 */
842static void atmel_tasklet_func(unsigned long data)
843{
844 struct uart_port *port = (struct uart_port *)data;
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800845 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800846 unsigned int status;
847 unsigned int status_change;
848
849 /* The interrupt handler does not take the lock */
850 spin_lock(&port->lock);
851
Chip Coldwella6670612008-02-08 04:21:06 -0800852 if (atmel_use_dma_tx(port))
853 atmel_tx_dma(port);
854 else
855 atmel_tx_chars(port);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800856
857 status = atmel_port->irq_status;
858 status_change = status ^ atmel_port->irq_status_prev;
859
860 if (status_change & (ATMEL_US_RI | ATMEL_US_DSR
861 | ATMEL_US_DCD | ATMEL_US_CTS)) {
862 /* TODO: All reads to CSR will clear these interrupts! */
863 if (status_change & ATMEL_US_RI)
864 port->icount.rng++;
865 if (status_change & ATMEL_US_DSR)
866 port->icount.dsr++;
867 if (status_change & ATMEL_US_DCD)
868 uart_handle_dcd_change(port, !(status & ATMEL_US_DCD));
869 if (status_change & ATMEL_US_CTS)
870 uart_handle_cts_change(port, !(status & ATMEL_US_CTS));
871
Alan Coxbdc04e32009-09-19 13:13:31 -0700872 wake_up_interruptible(&port->state->port.delta_msr_wait);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800873
874 atmel_port->irq_status_prev = status;
875 }
876
Chip Coldwella6670612008-02-08 04:21:06 -0800877 if (atmel_use_dma_rx(port))
878 atmel_rx_from_dma(port);
879 else
880 atmel_rx_from_ring(port);
Remy Bohmer1ecc26b2008-02-08 04:21:05 -0800881
882 spin_unlock(&port->lock);
883}
884
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000885/*
886 * Perform initialization and enable port for reception
887 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200888static int atmel_startup(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000889{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -0800890 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Alan Coxebd2c8f2009-09-19 13:13:28 -0700891 struct tty_struct *tty = port->state->port.tty;
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000892 int retval;
893
894 /*
895 * Ensure that no interrupts are enabled otherwise when
896 * request_irq() is called we could get stuck trying to
897 * handle an unexpected interrupt
898 */
899 UART_PUT_IDR(port, -1);
900
901 /*
902 * Allocate the IRQ
903 */
Remy Bohmerb843aa22008-02-08 04:21:01 -0800904 retval = request_irq(port->irq, atmel_interrupt, IRQF_SHARED,
Haavard Skinnemoenae161062008-02-08 04:21:08 -0800905 tty ? tty->name : "atmel_serial", port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000906 if (retval) {
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200907 printk("atmel_serial: atmel_startup - Can't get irq\n");
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000908 return retval;
909 }
910
911 /*
Chip Coldwella6670612008-02-08 04:21:06 -0800912 * Initialize DMA (if necessary)
913 */
914 if (atmel_use_dma_rx(port)) {
915 int i;
916
917 for (i = 0; i < 2; i++) {
918 struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
919
920 pdc->buf = kmalloc(PDC_BUFFER_SIZE, GFP_KERNEL);
921 if (pdc->buf == NULL) {
922 if (i != 0) {
923 dma_unmap_single(port->dev,
924 atmel_port->pdc_rx[0].dma_addr,
925 PDC_BUFFER_SIZE,
926 DMA_FROM_DEVICE);
927 kfree(atmel_port->pdc_rx[0].buf);
928 }
929 free_irq(port->irq, port);
930 return -ENOMEM;
931 }
932 pdc->dma_addr = dma_map_single(port->dev,
933 pdc->buf,
934 PDC_BUFFER_SIZE,
935 DMA_FROM_DEVICE);
936 pdc->dma_size = PDC_BUFFER_SIZE;
937 pdc->ofs = 0;
938 }
939
940 atmel_port->pdc_rx_idx = 0;
941
942 UART_PUT_RPR(port, atmel_port->pdc_rx[0].dma_addr);
943 UART_PUT_RCR(port, PDC_BUFFER_SIZE);
944
945 UART_PUT_RNPR(port, atmel_port->pdc_rx[1].dma_addr);
946 UART_PUT_RNCR(port, PDC_BUFFER_SIZE);
947 }
948 if (atmel_use_dma_tx(port)) {
949 struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
Alan Coxebd2c8f2009-09-19 13:13:28 -0700950 struct circ_buf *xmit = &port->state->xmit;
Chip Coldwella6670612008-02-08 04:21:06 -0800951
952 pdc->buf = xmit->buf;
953 pdc->dma_addr = dma_map_single(port->dev,
954 pdc->buf,
955 UART_XMIT_SIZE,
956 DMA_TO_DEVICE);
957 pdc->dma_size = UART_XMIT_SIZE;
958 pdc->ofs = 0;
959 }
960
961 /*
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000962 * If there is a specific "open" function (to register
963 * control line interrupts)
964 */
Haavard Skinnemoen71f2e2b2006-10-04 16:02:07 +0200965 if (atmel_open_hook) {
966 retval = atmel_open_hook(port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000967 if (retval) {
968 free_irq(port->irq, port);
969 return retval;
970 }
971 }
972
Atsushi Nemoto27c0c8e2009-02-18 14:48:28 -0800973 /* Save current CSR for comparison in atmel_tasklet_func() */
974 atmel_port->irq_status_prev = UART_GET_CSR(port);
975 atmel_port->irq_status = atmel_port->irq_status_prev;
976
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000977 /*
978 * Finally, enable the serial port
979 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +0200980 UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
Remy Bohmerb843aa22008-02-08 04:21:01 -0800981 /* enable xmit & rcvr */
982 UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
Andrew Victorafefc412006-06-19 19:53:19 +0100983
Chip Coldwella6670612008-02-08 04:21:06 -0800984 if (atmel_use_dma_rx(port)) {
985 /* set UART timeout */
986 UART_PUT_RTOR(port, PDC_RX_TIMEOUT);
987 UART_PUT_CR(port, ATMEL_US_STTTO);
988
989 UART_PUT_IER(port, ATMEL_US_ENDRX | ATMEL_US_TIMEOUT);
990 /* enable PDC controller */
991 UART_PUT_PTCR(port, ATMEL_PDC_RXTEN);
992 } else {
993 /* enable receive only */
994 UART_PUT_IER(port, ATMEL_US_RXRDY);
995 }
Andrew Victorafefc412006-06-19 19:53:19 +0100996
Andrew Victor1e6c9c22006-01-10 16:59:27 +0000997 return 0;
998}
999
1000/*
1001 * Disable the port
1002 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001003static void atmel_shutdown(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001004{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -08001005 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Chip Coldwella6670612008-02-08 04:21:06 -08001006 /*
1007 * Ensure everything is stopped.
1008 */
1009 atmel_stop_rx(port);
1010 atmel_stop_tx(port);
1011
1012 /*
1013 * Shut-down the DMA.
1014 */
1015 if (atmel_use_dma_rx(port)) {
1016 int i;
1017
1018 for (i = 0; i < 2; i++) {
1019 struct atmel_dma_buffer *pdc = &atmel_port->pdc_rx[i];
1020
1021 dma_unmap_single(port->dev,
1022 pdc->dma_addr,
1023 pdc->dma_size,
1024 DMA_FROM_DEVICE);
1025 kfree(pdc->buf);
1026 }
1027 }
1028 if (atmel_use_dma_tx(port)) {
1029 struct atmel_dma_buffer *pdc = &atmel_port->pdc_tx;
1030
1031 dma_unmap_single(port->dev,
1032 pdc->dma_addr,
1033 pdc->dma_size,
1034 DMA_TO_DEVICE);
1035 }
1036
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001037 /*
1038 * Disable all interrupts, port and break condition.
1039 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001040 UART_PUT_CR(port, ATMEL_US_RSTSTA);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001041 UART_PUT_IDR(port, -1);
1042
1043 /*
1044 * Free the interrupt
1045 */
1046 free_irq(port->irq, port);
1047
1048 /*
1049 * If there is a specific "close" function (to unregister
1050 * control line interrupts)
1051 */
Haavard Skinnemoen71f2e2b2006-10-04 16:02:07 +02001052 if (atmel_close_hook)
1053 atmel_close_hook(port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001054}
1055
1056/*
Haavard Skinnemoen9afd5612008-07-16 21:52:46 +01001057 * Flush any TX data submitted for DMA. Called when the TX circular
1058 * buffer is reset.
1059 */
1060static void atmel_flush_buffer(struct uart_port *port)
1061{
1062 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
1063
1064 if (atmel_use_dma_tx(port)) {
1065 UART_PUT_TCR(port, 0);
1066 atmel_port->pdc_tx.ofs = 0;
1067 }
1068}
1069
1070/*
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001071 * Power / Clock management.
1072 */
Remy Bohmerb843aa22008-02-08 04:21:01 -08001073static void atmel_serial_pm(struct uart_port *port, unsigned int state,
1074 unsigned int oldstate)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001075{
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -08001076 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Andrew Victorafefc412006-06-19 19:53:19 +01001077
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001078 switch (state) {
Remy Bohmerb843aa22008-02-08 04:21:01 -08001079 case 0:
1080 /*
1081 * Enable the peripheral clock for this serial port.
1082 * This is called on uart_open() or a resume event.
1083 */
1084 clk_enable(atmel_port->clk);
Anti Sullinf05596d2008-09-22 13:57:54 -07001085
1086 /* re-enable interrupts if we disabled some on suspend */
1087 UART_PUT_IER(port, atmel_port->backup_imr);
Remy Bohmerb843aa22008-02-08 04:21:01 -08001088 break;
1089 case 3:
Anti Sullinf05596d2008-09-22 13:57:54 -07001090 /* Back up the interrupt mask and disable all interrupts */
1091 atmel_port->backup_imr = UART_GET_IMR(port);
1092 UART_PUT_IDR(port, -1);
1093
Remy Bohmerb843aa22008-02-08 04:21:01 -08001094 /*
1095 * Disable the peripheral clock for this serial port.
1096 * This is called on uart_close() or a suspend event.
1097 */
1098 clk_disable(atmel_port->clk);
1099 break;
1100 default:
1101 printk(KERN_ERR "atmel_serial: unknown pm %d\n", state);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001102 }
1103}
1104
1105/*
1106 * Change the port parameters
1107 */
Remy Bohmerb843aa22008-02-08 04:21:01 -08001108static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
1109 struct ktermios *old)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001110{
1111 unsigned long flags;
1112 unsigned int mode, imr, quot, baud;
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001113 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001114
Andrew Victor03abeac2007-05-03 12:26:24 +01001115 /* Get current mode register */
Remy Bohmerb843aa22008-02-08 04:21:01 -08001116 mode = UART_GET_MR(port) & ~(ATMEL_US_USCLKS | ATMEL_US_CHRL
Peter Ma8e706c42009-03-31 10:31:02 -07001117 | ATMEL_US_NBSTOP | ATMEL_US_PAR
1118 | ATMEL_US_USMODE);
Andrew Victor03abeac2007-05-03 12:26:24 +01001119
Remy Bohmerb843aa22008-02-08 04:21:01 -08001120 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001121 quot = uart_get_divisor(port, baud);
1122
Remy Bohmerb843aa22008-02-08 04:21:01 -08001123 if (quot > 65535) { /* BRGR is 16-bit, so switch to slower clock */
Andrew Victor03abeac2007-05-03 12:26:24 +01001124 quot /= 8;
1125 mode |= ATMEL_US_USCLKS_MCK_DIV8;
1126 }
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001127
1128 /* byte size */
1129 switch (termios->c_cflag & CSIZE) {
1130 case CS5:
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001131 mode |= ATMEL_US_CHRL_5;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001132 break;
1133 case CS6:
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001134 mode |= ATMEL_US_CHRL_6;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001135 break;
1136 case CS7:
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001137 mode |= ATMEL_US_CHRL_7;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001138 break;
1139 default:
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001140 mode |= ATMEL_US_CHRL_8;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001141 break;
1142 }
1143
1144 /* stop bits */
1145 if (termios->c_cflag & CSTOPB)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001146 mode |= ATMEL_US_NBSTOP_2;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001147
1148 /* parity */
1149 if (termios->c_cflag & PARENB) {
Remy Bohmerb843aa22008-02-08 04:21:01 -08001150 /* Mark or Space parity */
1151 if (termios->c_cflag & CMSPAR) {
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001152 if (termios->c_cflag & PARODD)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001153 mode |= ATMEL_US_PAR_MARK;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001154 else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001155 mode |= ATMEL_US_PAR_SPACE;
Remy Bohmerb843aa22008-02-08 04:21:01 -08001156 } else if (termios->c_cflag & PARODD)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001157 mode |= ATMEL_US_PAR_ODD;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001158 else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001159 mode |= ATMEL_US_PAR_EVEN;
Remy Bohmerb843aa22008-02-08 04:21:01 -08001160 } else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001161 mode |= ATMEL_US_PAR_NONE;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001162
Peter Ma8e706c42009-03-31 10:31:02 -07001163 /* hardware handshake (RTS/CTS) */
1164 if (termios->c_cflag & CRTSCTS)
1165 mode |= ATMEL_US_USMODE_HWHS;
1166 else
1167 mode |= ATMEL_US_USMODE_NORMAL;
1168
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001169 spin_lock_irqsave(&port->lock, flags);
1170
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001171 port->read_status_mask = ATMEL_US_OVRE;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001172 if (termios->c_iflag & INPCK)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001173 port->read_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001174 if (termios->c_iflag & (BRKINT | PARMRK))
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001175 port->read_status_mask |= ATMEL_US_RXBRK;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001176
Chip Coldwella6670612008-02-08 04:21:06 -08001177 if (atmel_use_dma_rx(port))
1178 /* need to enable error interrupts */
1179 UART_PUT_IER(port, port->read_status_mask);
1180
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001181 /*
1182 * Characters to ignore
1183 */
1184 port->ignore_status_mask = 0;
1185 if (termios->c_iflag & IGNPAR)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001186 port->ignore_status_mask |= (ATMEL_US_FRAME | ATMEL_US_PARE);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001187 if (termios->c_iflag & IGNBRK) {
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001188 port->ignore_status_mask |= ATMEL_US_RXBRK;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001189 /*
1190 * If we're ignoring parity and break indicators,
1191 * ignore overruns too (for real raw support).
1192 */
1193 if (termios->c_iflag & IGNPAR)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001194 port->ignore_status_mask |= ATMEL_US_OVRE;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001195 }
Remy Bohmerb843aa22008-02-08 04:21:01 -08001196 /* TODO: Ignore all characters if CREAD is set.*/
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001197
1198 /* update the per-port timeout */
1199 uart_update_timeout(port, termios->c_cflag, baud);
1200
Haavard Skinnemoen0ccad872009-06-16 17:02:03 +01001201 /*
1202 * save/disable interrupts. The tty layer will ensure that the
1203 * transmitter is empty if requested by the caller, so there's
1204 * no need to wait for it here.
1205 */
Remy Bohmerb843aa22008-02-08 04:21:01 -08001206 imr = UART_GET_IMR(port);
1207 UART_PUT_IDR(port, -1);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001208
1209 /* disable receiver and transmitter */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001210 UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001211
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001212 /* Resetting serial mode to RS232 (0x0) */
1213 mode &= ~ATMEL_US_USMODE;
1214
1215 if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
1216 dev_dbg(port->dev, "Setting UART to RS485\n");
Claudio Scordino1b633182010-07-20 15:26:47 -07001217 if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
1218 UART_PUT_TTGR(port,
1219 atmel_port->rs485.delay_rts_after_send);
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001220 mode |= ATMEL_US_USMODE_RS485;
1221 } else {
1222 dev_dbg(port->dev, "Setting UART to RS232\n");
1223 }
1224
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001225 /* set the parity, stop bits and data size */
1226 UART_PUT_MR(port, mode);
1227
1228 /* set the baud rate */
1229 UART_PUT_BRGR(port, quot);
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001230 UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
1231 UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001232
1233 /* restore interrupts */
1234 UART_PUT_IER(port, imr);
1235
1236 /* CTS flow-control and modem-status interrupts */
1237 if (UART_ENABLE_MS(port, termios->c_cflag))
1238 port->ops->enable_ms(port);
1239
1240 spin_unlock_irqrestore(&port->lock, flags);
1241}
1242
1243/*
1244 * Return string describing the specified port
1245 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001246static const char *atmel_type(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001247{
Haavard Skinnemoen9ab4f882006-10-04 16:02:06 +02001248 return (port->type == PORT_ATMEL) ? "ATMEL_SERIAL" : NULL;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001249}
1250
1251/*
1252 * Release the memory region(s) being used by 'port'.
1253 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001254static void atmel_release_port(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001255{
Andrew Victorafefc412006-06-19 19:53:19 +01001256 struct platform_device *pdev = to_platform_device(port->dev);
1257 int size = pdev->resource[0].end - pdev->resource[0].start + 1;
1258
1259 release_mem_region(port->mapbase, size);
1260
1261 if (port->flags & UPF_IOREMAP) {
1262 iounmap(port->membase);
1263 port->membase = NULL;
1264 }
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001265}
1266
1267/*
1268 * Request the memory region(s) being used by 'port'.
1269 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001270static int atmel_request_port(struct uart_port *port)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001271{
Andrew Victorafefc412006-06-19 19:53:19 +01001272 struct platform_device *pdev = to_platform_device(port->dev);
1273 int size = pdev->resource[0].end - pdev->resource[0].start + 1;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001274
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001275 if (!request_mem_region(port->mapbase, size, "atmel_serial"))
Andrew Victorafefc412006-06-19 19:53:19 +01001276 return -EBUSY;
1277
1278 if (port->flags & UPF_IOREMAP) {
1279 port->membase = ioremap(port->mapbase, size);
1280 if (port->membase == NULL) {
1281 release_mem_region(port->mapbase, size);
1282 return -ENOMEM;
1283 }
1284 }
1285
1286 return 0;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001287}
1288
1289/*
1290 * Configure/autoconfigure the port.
1291 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001292static void atmel_config_port(struct uart_port *port, int flags)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001293{
1294 if (flags & UART_CONFIG_TYPE) {
Haavard Skinnemoen9ab4f882006-10-04 16:02:06 +02001295 port->type = PORT_ATMEL;
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001296 atmel_request_port(port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001297 }
1298}
1299
1300/*
1301 * Verify the new serial_struct (for TIOCSSERIAL).
1302 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001303static int atmel_verify_port(struct uart_port *port, struct serial_struct *ser)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001304{
1305 int ret = 0;
Haavard Skinnemoen9ab4f882006-10-04 16:02:06 +02001306 if (ser->type != PORT_UNKNOWN && ser->type != PORT_ATMEL)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001307 ret = -EINVAL;
1308 if (port->irq != ser->irq)
1309 ret = -EINVAL;
1310 if (ser->io_type != SERIAL_IO_MEM)
1311 ret = -EINVAL;
1312 if (port->uartclk / 16 != ser->baud_base)
1313 ret = -EINVAL;
1314 if ((void *)port->mapbase != ser->iomem_base)
1315 ret = -EINVAL;
1316 if (port->iobase != ser->port)
1317 ret = -EINVAL;
1318 if (ser->hub6 != 0)
1319 ret = -EINVAL;
1320 return ret;
1321}
1322
Albin Tonnerre8fe2d542009-12-09 12:31:32 -08001323#ifdef CONFIG_CONSOLE_POLL
1324static int atmel_poll_get_char(struct uart_port *port)
1325{
1326 while (!(UART_GET_CSR(port) & ATMEL_US_RXRDY))
1327 cpu_relax();
1328
1329 return UART_GET_CHAR(port);
1330}
1331
1332static void atmel_poll_put_char(struct uart_port *port, unsigned char ch)
1333{
1334 while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
1335 cpu_relax();
1336
1337 UART_PUT_CHAR(port, ch);
1338}
1339#endif
1340
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001341static int
1342atmel_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
1343{
1344 struct serial_rs485 rs485conf;
1345
1346 switch (cmd) {
1347 case TIOCSRS485:
1348 if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
1349 sizeof(rs485conf)))
1350 return -EFAULT;
1351
1352 atmel_config_rs485(port, &rs485conf);
1353 break;
1354
1355 case TIOCGRS485:
1356 if (copy_to_user((struct serial_rs485 *) arg,
1357 &(to_atmel_uart_port(port)->rs485),
1358 sizeof(rs485conf)))
1359 return -EFAULT;
1360 break;
1361
1362 default:
1363 return -ENOIOCTLCMD;
1364 }
1365 return 0;
1366}
1367
1368
1369
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001370static struct uart_ops atmel_pops = {
1371 .tx_empty = atmel_tx_empty,
1372 .set_mctrl = atmel_set_mctrl,
1373 .get_mctrl = atmel_get_mctrl,
1374 .stop_tx = atmel_stop_tx,
1375 .start_tx = atmel_start_tx,
1376 .stop_rx = atmel_stop_rx,
1377 .enable_ms = atmel_enable_ms,
1378 .break_ctl = atmel_break_ctl,
1379 .startup = atmel_startup,
1380 .shutdown = atmel_shutdown,
Haavard Skinnemoen9afd5612008-07-16 21:52:46 +01001381 .flush_buffer = atmel_flush_buffer,
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001382 .set_termios = atmel_set_termios,
1383 .type = atmel_type,
1384 .release_port = atmel_release_port,
1385 .request_port = atmel_request_port,
1386 .config_port = atmel_config_port,
1387 .verify_port = atmel_verify_port,
1388 .pm = atmel_serial_pm,
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001389 .ioctl = atmel_ioctl,
Albin Tonnerre8fe2d542009-12-09 12:31:32 -08001390#ifdef CONFIG_CONSOLE_POLL
1391 .poll_get_char = atmel_poll_get_char,
1392 .poll_put_char = atmel_poll_put_char,
1393#endif
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001394};
1395
Andrew Victorafefc412006-06-19 19:53:19 +01001396/*
1397 * Configure the port from the platform device resource info.
1398 */
Remy Bohmerb843aa22008-02-08 04:21:01 -08001399static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port,
1400 struct platform_device *pdev)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001401{
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001402 struct uart_port *port = &atmel_port->uart;
Haavard Skinnemoen73e27982006-10-04 16:02:04 +02001403 struct atmel_uart_data *data = pdev->dev.platform_data;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001404
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001405 port->iotype = UPIO_MEM;
1406 port->flags = UPF_BOOT_AUTOCONF;
1407 port->ops = &atmel_pops;
1408 port->fifosize = 1;
1409 port->line = pdev->id;
1410 port->dev = &pdev->dev;
Andrew Victorafefc412006-06-19 19:53:19 +01001411 port->mapbase = pdev->resource[0].start;
1412 port->irq = pdev->resource[1].start;
1413
Remy Bohmer1ecc26b2008-02-08 04:21:05 -08001414 tasklet_init(&atmel_port->tasklet, atmel_tasklet_func,
1415 (unsigned long)port);
1416
1417 memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring));
1418
Haavard Skinnemoen75d35212006-10-04 16:02:08 +02001419 if (data->regs)
1420 /* Already mapped by setup code */
1421 port->membase = data->regs;
Andrew Victorafefc412006-06-19 19:53:19 +01001422 else {
1423 port->flags |= UPF_IOREMAP;
1424 port->membase = NULL;
1425 }
1426
Remy Bohmerb843aa22008-02-08 04:21:01 -08001427 /* for console, the clock could already be configured */
1428 if (!atmel_port->clk) {
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001429 atmel_port->clk = clk_get(&pdev->dev, "usart");
1430 clk_enable(atmel_port->clk);
1431 port->uartclk = clk_get_rate(atmel_port->clk);
David Brownell06a7f052008-11-06 12:53:40 -08001432 clk_disable(atmel_port->clk);
1433 /* only enable clock when USART is in use */
Andrew Victorafefc412006-06-19 19:53:19 +01001434 }
Chip Coldwella6670612008-02-08 04:21:06 -08001435
1436 atmel_port->use_dma_rx = data->use_dma_rx;
1437 atmel_port->use_dma_tx = data->use_dma_tx;
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001438 atmel_port->rs485 = data->rs485;
1439 /* Use TXEMPTY for interrupt when rs485 else TXRDY or ENDTX|TXBUFE */
1440 if (atmel_port->rs485.flags & SER_RS485_ENABLED)
1441 atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
1442 else if (atmel_use_dma_tx(port)) {
Chip Coldwella6670612008-02-08 04:21:06 -08001443 port->fifosize = PDC_BUFFER_SIZE;
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001444 atmel_port->tx_done_mask = ATMEL_US_ENDTX | ATMEL_US_TXBUFE;
1445 } else {
1446 atmel_port->tx_done_mask = ATMEL_US_TXRDY;
1447 }
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001448}
1449
Andrew Victorafefc412006-06-19 19:53:19 +01001450/*
1451 * Register board-specific modem-control line handlers.
1452 */
Haavard Skinnemoen71f2e2b2006-10-04 16:02:07 +02001453void __init atmel_register_uart_fns(struct atmel_port_fns *fns)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001454{
1455 if (fns->enable_ms)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001456 atmel_pops.enable_ms = fns->enable_ms;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001457 if (fns->get_mctrl)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001458 atmel_pops.get_mctrl = fns->get_mctrl;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001459 if (fns->set_mctrl)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001460 atmel_pops.set_mctrl = fns->set_mctrl;
Haavard Skinnemoen71f2e2b2006-10-04 16:02:07 +02001461 atmel_open_hook = fns->open;
1462 atmel_close_hook = fns->close;
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001463 atmel_pops.pm = fns->pm;
1464 atmel_pops.set_wake = fns->set_wake;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001465}
1466
Haavard Skinnemoen749c4e62006-10-04 16:02:02 +02001467#ifdef CONFIG_SERIAL_ATMEL_CONSOLE
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001468static void atmel_console_putchar(struct uart_port *port, int ch)
Russell Kingd3587882006-03-20 20:00:09 +00001469{
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001470 while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
Haavard Skinnemoen829dd812008-02-08 04:21:02 -08001471 cpu_relax();
Russell Kingd3587882006-03-20 20:00:09 +00001472 UART_PUT_CHAR(port, ch);
1473}
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001474
1475/*
1476 * Interrupts are disabled on entering
1477 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001478static void atmel_console_write(struct console *co, const char *s, u_int count)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001479{
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001480 struct uart_port *port = &atmel_ports[co->index].uart;
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001481 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Russell Kingd3587882006-03-20 20:00:09 +00001482 unsigned int status, imr;
Marc Pignat39d4c922008-04-02 13:04:42 -07001483 unsigned int pdc_tx;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001484
1485 /*
Remy Bohmerb843aa22008-02-08 04:21:01 -08001486 * First, save IMR and then disable interrupts
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001487 */
Remy Bohmerb843aa22008-02-08 04:21:01 -08001488 imr = UART_GET_IMR(port);
Claudio Scordinoe8faff72010-05-03 13:31:28 +01001489 UART_PUT_IDR(port, ATMEL_US_RXRDY | atmel_port->tx_done_mask);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001490
Marc Pignat39d4c922008-04-02 13:04:42 -07001491 /* Store PDC transmit status and disable it */
1492 pdc_tx = UART_GET_PTSR(port) & ATMEL_PDC_TXTEN;
1493 UART_PUT_PTCR(port, ATMEL_PDC_TXTDIS);
1494
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001495 uart_console_write(port, s, count, atmel_console_putchar);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001496
1497 /*
Remy Bohmerb843aa22008-02-08 04:21:01 -08001498 * Finally, wait for transmitter to become empty
1499 * and restore IMR
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001500 */
1501 do {
1502 status = UART_GET_CSR(port);
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001503 } while (!(status & ATMEL_US_TXRDY));
Marc Pignat39d4c922008-04-02 13:04:42 -07001504
1505 /* Restore PDC transmit status */
1506 if (pdc_tx)
1507 UART_PUT_PTCR(port, ATMEL_PDC_TXTEN);
1508
Remy Bohmerb843aa22008-02-08 04:21:01 -08001509 /* set interrupts back the way they were */
1510 UART_PUT_IER(port, imr);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001511}
1512
1513/*
Remy Bohmerb843aa22008-02-08 04:21:01 -08001514 * If the port was already initialised (eg, by a boot loader),
1515 * try to determine the current setup.
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001516 */
Remy Bohmerb843aa22008-02-08 04:21:01 -08001517static void __init atmel_console_get_options(struct uart_port *port, int *baud,
1518 int *parity, int *bits)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001519{
1520 unsigned int mr, quot;
1521
Haavard Skinnemoen1c0fd822008-02-08 04:21:03 -08001522 /*
1523 * If the baud rate generator isn't running, the port wasn't
1524 * initialized by the boot loader.
1525 */
Haavard Skinnemoen9c81c5c2008-06-05 22:46:39 -07001526 quot = UART_GET_BRGR(port) & ATMEL_US_CD;
Haavard Skinnemoen1c0fd822008-02-08 04:21:03 -08001527 if (!quot)
1528 return;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001529
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001530 mr = UART_GET_MR(port) & ATMEL_US_CHRL;
1531 if (mr == ATMEL_US_CHRL_8)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001532 *bits = 8;
1533 else
1534 *bits = 7;
1535
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001536 mr = UART_GET_MR(port) & ATMEL_US_PAR;
1537 if (mr == ATMEL_US_PAR_EVEN)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001538 *parity = 'e';
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001539 else if (mr == ATMEL_US_PAR_ODD)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001540 *parity = 'o';
1541
Haavard Skinnemoen4d5e3922006-10-04 16:02:11 +02001542 /*
1543 * The serial core only rounds down when matching this to a
1544 * supported baud rate. Make sure we don't end up slightly
1545 * lower than one of those, as it would make us fall through
1546 * to a much lower baud rate than we really want.
1547 */
Haavard Skinnemoen4d5e3922006-10-04 16:02:11 +02001548 *baud = port->uartclk / (16 * (quot - 1));
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001549}
1550
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001551static int __init atmel_console_setup(struct console *co, char *options)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001552{
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001553 struct uart_port *port = &atmel_ports[co->index].uart;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001554 int baud = 115200;
1555 int bits = 8;
1556 int parity = 'n';
1557 int flow = 'n';
1558
Remy Bohmerb843aa22008-02-08 04:21:01 -08001559 if (port->membase == NULL) {
1560 /* Port not initialized yet - delay setup */
Andrew Victorafefc412006-06-19 19:53:19 +01001561 return -ENODEV;
Remy Bohmerb843aa22008-02-08 04:21:01 -08001562 }
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001563
David Brownell06a7f052008-11-06 12:53:40 -08001564 clk_enable(atmel_ports[co->index].clk);
1565
Remy Bohmerb843aa22008-02-08 04:21:01 -08001566 UART_PUT_IDR(port, -1);
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001567 UART_PUT_CR(port, ATMEL_US_RSTSTA | ATMEL_US_RSTRX);
1568 UART_PUT_CR(port, ATMEL_US_TXEN | ATMEL_US_RXEN);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001569
1570 if (options)
1571 uart_parse_options(options, &baud, &parity, &bits, &flow);
1572 else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001573 atmel_console_get_options(port, &baud, &parity, &bits);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001574
1575 return uart_set_options(port, co, baud, parity, bits, flow);
1576}
1577
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001578static struct uart_driver atmel_uart;
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001579
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001580static struct console atmel_console = {
1581 .name = ATMEL_DEVICENAME,
1582 .write = atmel_console_write,
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001583 .device = uart_console_device,
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001584 .setup = atmel_console_setup,
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001585 .flags = CON_PRINTBUFFER,
1586 .index = -1,
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001587 .data = &atmel_uart,
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001588};
1589
David Brownell06a7f052008-11-06 12:53:40 -08001590#define ATMEL_CONSOLE_DEVICE (&atmel_console)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001591
Andrew Victorafefc412006-06-19 19:53:19 +01001592/*
1593 * Early console initialization (before VM subsystem initialized).
1594 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001595static int __init atmel_console_init(void)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001596{
Haavard Skinnemoen73e27982006-10-04 16:02:04 +02001597 if (atmel_default_console_device) {
Remy Bohmerb843aa22008-02-08 04:21:01 -08001598 add_preferred_console(ATMEL_DEVICENAME,
1599 atmel_default_console_device->id, NULL);
1600 atmel_init_port(&atmel_ports[atmel_default_console_device->id],
1601 atmel_default_console_device);
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001602 register_console(&atmel_console);
Andrew Victorafefc412006-06-19 19:53:19 +01001603 }
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001604
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001605 return 0;
1606}
Remy Bohmerb843aa22008-02-08 04:21:01 -08001607
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001608console_initcall(atmel_console_init);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001609
Andrew Victorafefc412006-06-19 19:53:19 +01001610/*
1611 * Late console initialization.
1612 */
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001613static int __init atmel_late_console_init(void)
Andrew Victorafefc412006-06-19 19:53:19 +01001614{
Remy Bohmerb843aa22008-02-08 04:21:01 -08001615 if (atmel_default_console_device
1616 && !(atmel_console.flags & CON_ENABLED))
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001617 register_console(&atmel_console);
Andrew Victorafefc412006-06-19 19:53:19 +01001618
1619 return 0;
1620}
Remy Bohmerb843aa22008-02-08 04:21:01 -08001621
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001622core_initcall(atmel_late_console_init);
Andrew Victorafefc412006-06-19 19:53:19 +01001623
Haavard Skinnemoendfa7f342008-02-08 04:21:04 -08001624static inline bool atmel_is_console_port(struct uart_port *port)
1625{
1626 return port->cons && port->cons->index == port->line;
1627}
1628
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001629#else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001630#define ATMEL_CONSOLE_DEVICE NULL
Haavard Skinnemoendfa7f342008-02-08 04:21:04 -08001631
1632static inline bool atmel_is_console_port(struct uart_port *port)
1633{
1634 return false;
1635}
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001636#endif
1637
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001638static struct uart_driver atmel_uart = {
Remy Bohmerb843aa22008-02-08 04:21:01 -08001639 .owner = THIS_MODULE,
1640 .driver_name = "atmel_serial",
1641 .dev_name = ATMEL_DEVICENAME,
1642 .major = SERIAL_ATMEL_MAJOR,
1643 .minor = MINOR_START,
1644 .nr = ATMEL_MAX_UART,
1645 .cons = ATMEL_CONSOLE_DEVICE,
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001646};
1647
Andrew Victorafefc412006-06-19 19:53:19 +01001648#ifdef CONFIG_PM
Haavard Skinnemoenf826caa2008-02-24 14:34:45 +01001649static bool atmel_serial_clk_will_stop(void)
1650{
1651#ifdef CONFIG_ARCH_AT91
1652 return at91_suspend_entering_slow_clock();
1653#else
1654 return false;
1655#endif
1656}
1657
Remy Bohmerb843aa22008-02-08 04:21:01 -08001658static int atmel_serial_suspend(struct platform_device *pdev,
1659 pm_message_t state)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001660{
Andrew Victorafefc412006-06-19 19:53:19 +01001661 struct uart_port *port = platform_get_drvdata(pdev);
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -08001662 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001663
Haavard Skinnemoene1c609e2008-03-14 14:54:13 +01001664 if (atmel_is_console_port(port) && console_suspend_enabled) {
1665 /* Drain the TX shifter */
1666 while (!(UART_GET_CSR(port) & ATMEL_US_TXEMPTY))
1667 cpu_relax();
1668 }
1669
Anti Sullinf05596d2008-09-22 13:57:54 -07001670 /* we can not wake up if we're running on slow clock */
1671 atmel_port->may_wakeup = device_may_wakeup(&pdev->dev);
1672 if (atmel_serial_clk_will_stop())
1673 device_set_wakeup_enable(&pdev->dev, 0);
1674
1675 uart_suspend_port(&atmel_uart, port);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001676
1677 return 0;
1678}
1679
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001680static int atmel_serial_resume(struct platform_device *pdev)
Andrew Victorafefc412006-06-19 19:53:19 +01001681{
1682 struct uart_port *port = platform_get_drvdata(pdev);
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -08001683 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Andrew Victorafefc412006-06-19 19:53:19 +01001684
Anti Sullinf05596d2008-09-22 13:57:54 -07001685 uart_resume_port(&atmel_uart, port);
1686 device_set_wakeup_enable(&pdev->dev, atmel_port->may_wakeup);
Andrew Victorafefc412006-06-19 19:53:19 +01001687
1688 return 0;
1689}
1690#else
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001691#define atmel_serial_suspend NULL
1692#define atmel_serial_resume NULL
Andrew Victorafefc412006-06-19 19:53:19 +01001693#endif
1694
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001695static int __devinit atmel_serial_probe(struct platform_device *pdev)
Andrew Victorafefc412006-06-19 19:53:19 +01001696{
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001697 struct atmel_uart_port *port;
Remy Bohmer1ecc26b2008-02-08 04:21:05 -08001698 void *data;
Andrew Victorafefc412006-06-19 19:53:19 +01001699 int ret;
1700
Haavard Skinnemoen9d09daf2009-10-26 16:50:02 -07001701 BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
Remy Bohmer1ecc26b2008-02-08 04:21:05 -08001702
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001703 port = &atmel_ports[pdev->id];
Anti Sullinf05596d2008-09-22 13:57:54 -07001704 port->backup_imr = 0;
1705
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001706 atmel_init_port(port, pdev);
Andrew Victorafefc412006-06-19 19:53:19 +01001707
Chip Coldwella6670612008-02-08 04:21:06 -08001708 if (!atmel_use_dma_rx(&port->uart)) {
1709 ret = -ENOMEM;
Haavard Skinnemoen64334712008-02-08 04:21:07 -08001710 data = kmalloc(sizeof(struct atmel_uart_char)
1711 * ATMEL_SERIAL_RINGSIZE, GFP_KERNEL);
Chip Coldwella6670612008-02-08 04:21:06 -08001712 if (!data)
1713 goto err_alloc_ring;
1714 port->rx_ring.buf = data;
1715 }
Remy Bohmer1ecc26b2008-02-08 04:21:05 -08001716
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001717 ret = uart_add_one_port(&atmel_uart, &port->uart);
Haavard Skinnemoendfa7f342008-02-08 04:21:04 -08001718 if (ret)
1719 goto err_add_port;
1720
Albin Tonnerre8da14b52009-07-29 15:04:18 -07001721#ifdef CONFIG_SERIAL_ATMEL_CONSOLE
David Brownell06a7f052008-11-06 12:53:40 -08001722 if (atmel_is_console_port(&port->uart)
1723 && ATMEL_CONSOLE_DEVICE->flags & CON_ENABLED) {
1724 /*
1725 * The serial core enabled the clock for us, so undo
1726 * the clk_enable() in atmel_console_setup()
1727 */
1728 clk_disable(port->clk);
1729 }
Albin Tonnerre8da14b52009-07-29 15:04:18 -07001730#endif
David Brownell06a7f052008-11-06 12:53:40 -08001731
Haavard Skinnemoendfa7f342008-02-08 04:21:04 -08001732 device_init_wakeup(&pdev->dev, 1);
1733 platform_set_drvdata(pdev, port);
1734
1735 return 0;
1736
1737err_add_port:
Remy Bohmer1ecc26b2008-02-08 04:21:05 -08001738 kfree(port->rx_ring.buf);
1739 port->rx_ring.buf = NULL;
1740err_alloc_ring:
Haavard Skinnemoendfa7f342008-02-08 04:21:04 -08001741 if (!atmel_is_console_port(&port->uart)) {
Haavard Skinnemoendfa7f342008-02-08 04:21:04 -08001742 clk_put(port->clk);
1743 port->clk = NULL;
Andrew Victorafefc412006-06-19 19:53:19 +01001744 }
1745
1746 return ret;
1747}
1748
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001749static int __devexit atmel_serial_remove(struct platform_device *pdev)
Andrew Victorafefc412006-06-19 19:53:19 +01001750{
1751 struct uart_port *port = platform_get_drvdata(pdev);
Haavard Skinnemoenc811ab82008-02-08 04:21:08 -08001752 struct atmel_uart_port *atmel_port = to_atmel_uart_port(port);
Andrew Victorafefc412006-06-19 19:53:19 +01001753 int ret = 0;
1754
Andrew Victorafefc412006-06-19 19:53:19 +01001755 device_init_wakeup(&pdev->dev, 0);
1756 platform_set_drvdata(pdev, NULL);
1757
Haavard Skinnemoendfa7f342008-02-08 04:21:04 -08001758 ret = uart_remove_one_port(&atmel_uart, port);
1759
Remy Bohmer1ecc26b2008-02-08 04:21:05 -08001760 tasklet_kill(&atmel_port->tasklet);
1761 kfree(atmel_port->rx_ring.buf);
1762
Haavard Skinnemoendfa7f342008-02-08 04:21:04 -08001763 /* "port" is allocated statically, so we shouldn't free it */
1764
Haavard Skinnemoendfa7f342008-02-08 04:21:04 -08001765 clk_put(atmel_port->clk);
Andrew Victorafefc412006-06-19 19:53:19 +01001766
1767 return ret;
1768}
1769
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001770static struct platform_driver atmel_serial_driver = {
1771 .probe = atmel_serial_probe,
1772 .remove = __devexit_p(atmel_serial_remove),
1773 .suspend = atmel_serial_suspend,
1774 .resume = atmel_serial_resume,
Andrew Victorafefc412006-06-19 19:53:19 +01001775 .driver = {
Haavard Skinnemoen1e8ea802006-10-04 16:02:03 +02001776 .name = "atmel_usart",
Andrew Victorafefc412006-06-19 19:53:19 +01001777 .owner = THIS_MODULE,
1778 },
1779};
1780
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001781static int __init atmel_serial_init(void)
Andrew Victorafefc412006-06-19 19:53:19 +01001782{
1783 int ret;
1784
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001785 ret = uart_register_driver(&atmel_uart);
Andrew Victorafefc412006-06-19 19:53:19 +01001786 if (ret)
1787 return ret;
1788
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001789 ret = platform_driver_register(&atmel_serial_driver);
Andrew Victorafefc412006-06-19 19:53:19 +01001790 if (ret)
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001791 uart_unregister_driver(&atmel_uart);
Andrew Victorafefc412006-06-19 19:53:19 +01001792
1793 return ret;
1794}
1795
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001796static void __exit atmel_serial_exit(void)
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001797{
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001798 platform_driver_unregister(&atmel_serial_driver);
1799 uart_unregister_driver(&atmel_uart);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001800}
1801
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001802module_init(atmel_serial_init);
1803module_exit(atmel_serial_exit);
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001804
1805MODULE_AUTHOR("Rick Bronson");
Haavard Skinnemoen7192f922006-10-04 16:02:05 +02001806MODULE_DESCRIPTION("Atmel AT91 / AT32 serial port driver");
Andrew Victor1e6c9c22006-01-10 16:59:27 +00001807MODULE_LICENSE("GPL");
Kay Sieverse169c132008-04-15 14:34:35 -07001808MODULE_ALIAS("platform:atmel_usart");