diff options
author | Hans-Christian Egtvedt <hcegtvedt@atmel.com> | 2008-04-15 01:30:47 -0400 |
---|---|---|
committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2008-04-15 01:30:47 -0400 |
commit | 9f9439e92a7fb057d31a19636b99e43306192756 (patch) | |
tree | cb4b9592873f5b599317fd8f87db1ee3990125a0 /drivers/input | |
parent | 0beb4f6f294b0f2dde07fa9da9c00abd4f9c8b50 (diff) |
Input: add PS/2 serio driver for AVR32 devices
Add support for the PSIF peripheral on AVR32 AP7 devices. It is implemented
as a serio driver and will behave like a serio 8042 device.
The driver has been tested with a Dell keyboard capable of running on 3.3
volts and a Logitech mouse on the STK1000 + STK1002 starter kit. The Logitech
mouse was hacked by cutting the cord and using a bi-directional voltage
converter to get the required 5 volt I/O level.
For more information about the PSIF module, see the datasheet for AT32AP700X at
http://www.atmel.com/dyn/products/datasheets.asp?family_id=682
Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input')
-rw-r--r-- | drivers/input/serio/Kconfig | 10 | ||||
-rw-r--r-- | drivers/input/serio/Makefile | 1 | ||||
-rw-r--r-- | drivers/input/serio/at32psif.c | 375 |
3 files changed, 386 insertions, 0 deletions
diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig index b88569e21d60..ec4b6610f730 100644 --- a/drivers/input/serio/Kconfig +++ b/drivers/input/serio/Kconfig | |||
@@ -88,6 +88,16 @@ config SERIO_RPCKBD | |||
88 | To compile this driver as a module, choose M here: the | 88 | To compile this driver as a module, choose M here: the |
89 | module will be called rpckbd. | 89 | module will be called rpckbd. |
90 | 90 | ||
91 | config SERIO_AT32PSIF | ||
92 | tristate "AVR32 PSIF PS/2 keyboard and mouse controller" | ||
93 | depends on AVR32 | ||
94 | help | ||
95 | Say Y here if you want to use the PSIF peripheral on AVR32 devices | ||
96 | and connect a PS/2 keyboard and/or mouse to it. | ||
97 | |||
98 | To compile this driver as a module, choose M here: the module will | ||
99 | be called at32psif. | ||
100 | |||
91 | config SERIO_AMBAKMI | 101 | config SERIO_AMBAKMI |
92 | tristate "AMBA KMI keyboard controller" | 102 | tristate "AMBA KMI keyboard controller" |
93 | depends on ARM_AMBA | 103 | depends on ARM_AMBA |
diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile index 4155197867a3..38b886887cbc 100644 --- a/drivers/input/serio/Makefile +++ b/drivers/input/serio/Makefile | |||
@@ -12,6 +12,7 @@ obj-$(CONFIG_SERIO_CT82C710) += ct82c710.o | |||
12 | obj-$(CONFIG_SERIO_RPCKBD) += rpckbd.o | 12 | obj-$(CONFIG_SERIO_RPCKBD) += rpckbd.o |
13 | obj-$(CONFIG_SERIO_SA1111) += sa1111ps2.o | 13 | obj-$(CONFIG_SERIO_SA1111) += sa1111ps2.o |
14 | obj-$(CONFIG_SERIO_AMBAKMI) += ambakmi.o | 14 | obj-$(CONFIG_SERIO_AMBAKMI) += ambakmi.o |
15 | obj-$(CONFIG_SERIO_AT32PSIF) += at32psif.o | ||
15 | obj-$(CONFIG_SERIO_Q40KBD) += q40kbd.o | 16 | obj-$(CONFIG_SERIO_Q40KBD) += q40kbd.o |
16 | obj-$(CONFIG_SERIO_GSCPS2) += gscps2.o | 17 | obj-$(CONFIG_SERIO_GSCPS2) += gscps2.o |
17 | obj-$(CONFIG_HP_SDC) += hp_sdc.o | 18 | obj-$(CONFIG_HP_SDC) += hp_sdc.o |
diff --git a/drivers/input/serio/at32psif.c b/drivers/input/serio/at32psif.c new file mode 100644 index 000000000000..c267588f7308 --- /dev/null +++ b/drivers/input/serio/at32psif.c | |||
@@ -0,0 +1,375 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2007 Atmel Corporation | ||
3 | * | ||
4 | * Driver for the AT32AP700X PS/2 controller (PSIF). | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify it | ||
7 | * under the terms of the GNU General Public License version 2 as published | ||
8 | * by the Free Software Foundation. | ||
9 | */ | ||
10 | #include <linux/kernel.h> | ||
11 | #include <linux/module.h> | ||
12 | #include <linux/device.h> | ||
13 | #include <linux/init.h> | ||
14 | #include <linux/serio.h> | ||
15 | #include <linux/interrupt.h> | ||
16 | #include <linux/delay.h> | ||
17 | #include <linux/err.h> | ||
18 | #include <linux/io.h> | ||
19 | #include <linux/clk.h> | ||
20 | #include <linux/platform_device.h> | ||
21 | |||
22 | /* PSIF register offsets */ | ||
23 | #define PSIF_CR 0x00 | ||
24 | #define PSIF_RHR 0x04 | ||
25 | #define PSIF_THR 0x08 | ||
26 | #define PSIF_SR 0x10 | ||
27 | #define PSIF_IER 0x14 | ||
28 | #define PSIF_IDR 0x18 | ||
29 | #define PSIF_IMR 0x1c | ||
30 | #define PSIF_PSR 0x24 | ||
31 | |||
32 | /* Bitfields in control register. */ | ||
33 | #define PSIF_CR_RXDIS_OFFSET 1 | ||
34 | #define PSIF_CR_RXDIS_SIZE 1 | ||
35 | #define PSIF_CR_RXEN_OFFSET 0 | ||
36 | #define PSIF_CR_RXEN_SIZE 1 | ||
37 | #define PSIF_CR_SWRST_OFFSET 15 | ||
38 | #define PSIF_CR_SWRST_SIZE 1 | ||
39 | #define PSIF_CR_TXDIS_OFFSET 9 | ||
40 | #define PSIF_CR_TXDIS_SIZE 1 | ||
41 | #define PSIF_CR_TXEN_OFFSET 8 | ||
42 | #define PSIF_CR_TXEN_SIZE 1 | ||
43 | |||
44 | /* Bitfields in interrupt disable, enable, mask and status register. */ | ||
45 | #define PSIF_NACK_OFFSET 8 | ||
46 | #define PSIF_NACK_SIZE 1 | ||
47 | #define PSIF_OVRUN_OFFSET 5 | ||
48 | #define PSIF_OVRUN_SIZE 1 | ||
49 | #define PSIF_PARITY_OFFSET 9 | ||
50 | #define PSIF_PARITY_SIZE 1 | ||
51 | #define PSIF_RXRDY_OFFSET 4 | ||
52 | #define PSIF_RXRDY_SIZE 1 | ||
53 | #define PSIF_TXEMPTY_OFFSET 1 | ||
54 | #define PSIF_TXEMPTY_SIZE 1 | ||
55 | #define PSIF_TXRDY_OFFSET 0 | ||
56 | #define PSIF_TXRDY_SIZE 1 | ||
57 | |||
58 | /* Bitfields in prescale register. */ | ||
59 | #define PSIF_PSR_PRSCV_OFFSET 0 | ||
60 | #define PSIF_PSR_PRSCV_SIZE 12 | ||
61 | |||
62 | /* Bitfields in receive hold register. */ | ||
63 | #define PSIF_RHR_RXDATA_OFFSET 0 | ||
64 | #define PSIF_RHR_RXDATA_SIZE 8 | ||
65 | |||
66 | /* Bitfields in transmit hold register. */ | ||
67 | #define PSIF_THR_TXDATA_OFFSET 0 | ||
68 | #define PSIF_THR_TXDATA_SIZE 8 | ||
69 | |||
70 | /* Bit manipulation macros */ | ||
71 | #define PSIF_BIT(name) \ | ||
72 | (1 << PSIF_##name##_OFFSET) | ||
73 | |||
74 | #define PSIF_BF(name, value) \ | ||
75 | (((value) & ((1 << PSIF_##name##_SIZE) - 1)) \ | ||
76 | << PSIF_##name##_OFFSET) | ||
77 | |||
78 | #define PSIF_BFEXT(name, value) \ | ||
79 | (((value) >> PSIF_##name##_OFFSET) \ | ||
80 | & ((1 << PSIF_##name##_SIZE) - 1)) | ||
81 | |||
82 | #define PSIF_BFINS(name, value, old) \ | ||
83 | (((old) & ~(((1 << PSIF_##name##_SIZE) - 1) \ | ||
84 | << PSIF_##name##_OFFSET)) \ | ||
85 | | PSIF_BF(name, value)) | ||
86 | |||
87 | /* Register access macros */ | ||
88 | #define psif_readl(port, reg) \ | ||
89 | __raw_readl((port)->regs + PSIF_##reg) | ||
90 | |||
91 | #define psif_writel(port, reg, value) \ | ||
92 | __raw_writel((value), (port)->regs + PSIF_##reg) | ||
93 | |||
94 | struct psif { | ||
95 | struct platform_device *pdev; | ||
96 | struct clk *pclk; | ||
97 | struct serio *io; | ||
98 | void __iomem *regs; | ||
99 | unsigned int irq; | ||
100 | unsigned int open; | ||
101 | /* Prevent concurrent writes to PSIF THR. */ | ||
102 | spinlock_t lock; | ||
103 | }; | ||
104 | |||
105 | static irqreturn_t psif_interrupt(int irq, void *_ptr) | ||
106 | { | ||
107 | struct psif *psif = _ptr; | ||
108 | int retval = IRQ_NONE; | ||
109 | unsigned int io_flags = 0; | ||
110 | unsigned long status; | ||
111 | |||
112 | status = psif_readl(psif, SR); | ||
113 | |||
114 | if (status & PSIF_BIT(RXRDY)) { | ||
115 | unsigned char val = (unsigned char) psif_readl(psif, RHR); | ||
116 | |||
117 | if (status & PSIF_BIT(PARITY)) | ||
118 | io_flags |= SERIO_PARITY; | ||
119 | if (status & PSIF_BIT(OVRUN)) | ||
120 | dev_err(&psif->pdev->dev, "overrun read error\n"); | ||
121 | |||
122 | serio_interrupt(psif->io, val, io_flags); | ||
123 | |||
124 | retval = IRQ_HANDLED; | ||
125 | } | ||
126 | |||
127 | return retval; | ||
128 | } | ||
129 | |||
130 | static int psif_write(struct serio *io, unsigned char val) | ||
131 | { | ||
132 | struct psif *psif = io->port_data; | ||
133 | unsigned long flags; | ||
134 | int timeout = 10; | ||
135 | int retval = 0; | ||
136 | |||
137 | spin_lock_irqsave(&psif->lock, flags); | ||
138 | |||
139 | while (!(psif_readl(psif, SR) & PSIF_BIT(TXEMPTY)) && timeout--) | ||
140 | msleep(10); | ||
141 | |||
142 | if (timeout >= 0) { | ||
143 | psif_writel(psif, THR, val); | ||
144 | } else { | ||
145 | dev_dbg(&psif->pdev->dev, "timeout writing to THR\n"); | ||
146 | retval = -EBUSY; | ||
147 | } | ||
148 | |||
149 | spin_unlock_irqrestore(&psif->lock, flags); | ||
150 | |||
151 | return retval; | ||
152 | } | ||
153 | |||
154 | static int psif_open(struct serio *io) | ||
155 | { | ||
156 | struct psif *psif = io->port_data; | ||
157 | int retval; | ||
158 | |||
159 | retval = clk_enable(psif->pclk); | ||
160 | if (retval) | ||
161 | goto out; | ||
162 | |||
163 | psif_writel(psif, CR, PSIF_BIT(CR_TXEN) | PSIF_BIT(CR_RXEN)); | ||
164 | psif_writel(psif, IER, PSIF_BIT(RXRDY)); | ||
165 | |||
166 | psif->open = 1; | ||
167 | out: | ||
168 | return retval; | ||
169 | } | ||
170 | |||
171 | static void psif_close(struct serio *io) | ||
172 | { | ||
173 | struct psif *psif = io->port_data; | ||
174 | |||
175 | psif->open = 0; | ||
176 | |||
177 | psif_writel(psif, IDR, ~0UL); | ||
178 | psif_writel(psif, CR, PSIF_BIT(CR_TXDIS) | PSIF_BIT(CR_RXDIS)); | ||
179 | |||
180 | clk_disable(psif->pclk); | ||
181 | } | ||
182 | |||
183 | static void psif_set_prescaler(struct psif *psif) | ||
184 | { | ||
185 | unsigned long prscv; | ||
186 | unsigned long rate = clk_get_rate(psif->pclk); | ||
187 | |||
188 | /* PRSCV = Pulse length (100 us) * PSIF module frequency. */ | ||
189 | prscv = 100 * (rate / 1000000UL); | ||
190 | |||
191 | if (prscv > ((1<<PSIF_PSR_PRSCV_SIZE) - 1)) { | ||
192 | prscv = (1<<PSIF_PSR_PRSCV_SIZE) - 1; | ||
193 | dev_dbg(&psif->pdev->dev, "pclk too fast, " | ||
194 | "prescaler set to max\n"); | ||
195 | } | ||
196 | |||
197 | clk_enable(psif->pclk); | ||
198 | psif_writel(psif, PSR, prscv); | ||
199 | clk_disable(psif->pclk); | ||
200 | } | ||
201 | |||
202 | static int __init psif_probe(struct platform_device *pdev) | ||
203 | { | ||
204 | struct resource *regs; | ||
205 | struct psif *psif; | ||
206 | struct serio *io; | ||
207 | struct clk *pclk; | ||
208 | int irq; | ||
209 | int ret; | ||
210 | |||
211 | psif = kzalloc(sizeof(struct psif), GFP_KERNEL); | ||
212 | if (!psif) { | ||
213 | dev_dbg(&pdev->dev, "out of memory\n"); | ||
214 | ret = -ENOMEM; | ||
215 | goto out; | ||
216 | } | ||
217 | psif->pdev = pdev; | ||
218 | |||
219 | io = kzalloc(sizeof(struct serio), GFP_KERNEL); | ||
220 | if (!io) { | ||
221 | dev_dbg(&pdev->dev, "out of memory\n"); | ||
222 | ret = -ENOMEM; | ||
223 | goto out_free_psif; | ||
224 | } | ||
225 | psif->io = io; | ||
226 | |||
227 | regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
228 | if (!regs) { | ||
229 | dev_dbg(&pdev->dev, "no mmio resources defined\n"); | ||
230 | ret = -ENOMEM; | ||
231 | goto out_free_io; | ||
232 | } | ||
233 | |||
234 | psif->regs = ioremap(regs->start, regs->end - regs->start + 1); | ||
235 | if (!psif->regs) { | ||
236 | ret = -ENOMEM; | ||
237 | dev_dbg(&pdev->dev, "could not map I/O memory\n"); | ||
238 | goto out_free_io; | ||
239 | } | ||
240 | |||
241 | pclk = clk_get(&pdev->dev, "pclk"); | ||
242 | if (IS_ERR(pclk)) { | ||
243 | dev_dbg(&pdev->dev, "could not get peripheral clock\n"); | ||
244 | ret = PTR_ERR(pclk); | ||
245 | goto out_iounmap; | ||
246 | } | ||
247 | psif->pclk = pclk; | ||
248 | |||
249 | /* Reset the PSIF to enter at a known state. */ | ||
250 | ret = clk_enable(pclk); | ||
251 | if (ret) { | ||
252 | dev_dbg(&pdev->dev, "could not enable pclk\n"); | ||
253 | goto out_put_clk; | ||
254 | } | ||
255 | psif_writel(psif, CR, PSIF_BIT(CR_SWRST)); | ||
256 | clk_disable(pclk); | ||
257 | |||
258 | irq = platform_get_irq(pdev, 0); | ||
259 | if (irq < 0) { | ||
260 | dev_dbg(&pdev->dev, "could not get irq\n"); | ||
261 | ret = -ENXIO; | ||
262 | goto out_put_clk; | ||
263 | } | ||
264 | ret = request_irq(irq, psif_interrupt, IRQF_SHARED, "at32psif", psif); | ||
265 | if (ret) { | ||
266 | dev_dbg(&pdev->dev, "could not request irq %d\n", irq); | ||
267 | goto out_put_clk; | ||
268 | } | ||
269 | psif->irq = irq; | ||
270 | |||
271 | io->id.type = SERIO_8042; | ||
272 | io->write = psif_write; | ||
273 | io->open = psif_open; | ||
274 | io->close = psif_close; | ||
275 | snprintf(io->name, sizeof(io->name), "AVR32 PS/2 port%d", pdev->id); | ||
276 | snprintf(io->phys, sizeof(io->phys), "at32psif/serio%d", pdev->id); | ||
277 | io->port_data = psif; | ||
278 | io->dev.parent = &pdev->dev; | ||
279 | |||
280 | psif_set_prescaler(psif); | ||
281 | |||
282 | spin_lock_init(&psif->lock); | ||
283 | serio_register_port(psif->io); | ||
284 | platform_set_drvdata(pdev, psif); | ||
285 | |||
286 | dev_info(&pdev->dev, "Atmel AVR32 PSIF PS/2 driver on 0x%08x irq %d\n", | ||
287 | (int)psif->regs, psif->irq); | ||
288 | |||
289 | return 0; | ||
290 | |||
291 | out_put_clk: | ||
292 | clk_put(psif->pclk); | ||
293 | out_iounmap: | ||
294 | iounmap(psif->regs); | ||
295 | out_free_io: | ||
296 | kfree(io); | ||
297 | out_free_psif: | ||
298 | kfree(psif); | ||
299 | out: | ||
300 | return ret; | ||
301 | } | ||
302 | |||
303 | static int __exit psif_remove(struct platform_device *pdev) | ||
304 | { | ||
305 | struct psif *psif = platform_get_drvdata(pdev); | ||
306 | |||
307 | psif_writel(psif, IDR, ~0UL); | ||
308 | psif_writel(psif, CR, PSIF_BIT(CR_TXDIS) | PSIF_BIT(CR_RXDIS)); | ||
309 | |||
310 | serio_unregister_port(psif->io); | ||
311 | iounmap(psif->regs); | ||
312 | free_irq(psif->irq, psif); | ||
313 | clk_put(psif->pclk); | ||
314 | kfree(psif); | ||
315 | |||
316 | platform_set_drvdata(pdev, NULL); | ||
317 | |||
318 | return 0; | ||
319 | } | ||
320 | |||
321 | #ifdef CONFIG_PM | ||
322 | static int psif_suspend(struct platform_device *pdev, pm_message_t state) | ||
323 | { | ||
324 | struct psif *psif = platform_get_drvdata(pdev); | ||
325 | |||
326 | if (psif->open) { | ||
327 | psif_writel(psif, CR, PSIF_BIT(CR_RXDIS) | PSIF_BIT(CR_TXDIS)); | ||
328 | clk_disable(psif->pclk); | ||
329 | } | ||
330 | |||
331 | return 0; | ||
332 | } | ||
333 | |||
334 | static int psif_resume(struct platform_device *pdev) | ||
335 | { | ||
336 | struct psif *psif = platform_get_drvdata(pdev); | ||
337 | |||
338 | if (psif->open) { | ||
339 | clk_enable(psif->pclk); | ||
340 | psif_set_prescaler(psif); | ||
341 | psif_writel(psif, CR, PSIF_BIT(CR_RXEN) | PSIF_BIT(CR_TXEN)); | ||
342 | } | ||
343 | |||
344 | return 0; | ||
345 | } | ||
346 | #else | ||
347 | #define psif_suspend NULL | ||
348 | #define psif_resume NULL | ||
349 | #endif | ||
350 | |||
351 | static struct platform_driver psif_driver = { | ||
352 | .remove = __exit_p(psif_remove), | ||
353 | .driver = { | ||
354 | .name = "atmel_psif", | ||
355 | }, | ||
356 | .suspend = psif_suspend, | ||
357 | .resume = psif_resume, | ||
358 | }; | ||
359 | |||
360 | static int __init psif_init(void) | ||
361 | { | ||
362 | return platform_driver_probe(&psif_driver, psif_probe); | ||
363 | } | ||
364 | |||
365 | static void __exit psif_exit(void) | ||
366 | { | ||
367 | platform_driver_unregister(&psif_driver); | ||
368 | } | ||
369 | |||
370 | module_init(psif_init); | ||
371 | module_exit(psif_exit); | ||
372 | |||
373 | MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>"); | ||
374 | MODULE_DESCRIPTION("Atmel AVR32 PSIF PS/2 driver"); | ||
375 | MODULE_LICENSE("GPL"); | ||