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-rw-r--r--drivers/input/serio/Kconfig10
-rw-r--r--drivers/input/serio/Makefile1
-rw-r--r--drivers/input/serio/xilinx_ps2.c380
3 files changed, 391 insertions, 0 deletions
diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
index ec4b6610f730..27d70d326ff3 100644
--- a/drivers/input/serio/Kconfig
+++ b/drivers/input/serio/Kconfig
@@ -190,4 +190,14 @@ config SERIO_RAW
190 To compile this driver as a module, choose M here: the 190 To compile this driver as a module, choose M here: the
191 module will be called serio_raw. 191 module will be called serio_raw.
192 192
193config SERIO_XILINX_XPS_PS2
194 tristate "Xilinx XPS PS/2 Controller Support"
195 depends on PPC
196 help
197 This driver supports XPS PS/2 IP from the Xilinx EDK on
198 PowerPC platform.
199
200 To compile this driver as a module, choose M here: the
201 module will be called xilinx_ps2.
202
193endif 203endif
diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile
index 38b886887cbc..9b6c8135955f 100644
--- a/drivers/input/serio/Makefile
+++ b/drivers/input/serio/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_SERIO_PCIPS2) += pcips2.o
21obj-$(CONFIG_SERIO_MACEPS2) += maceps2.o 21obj-$(CONFIG_SERIO_MACEPS2) += maceps2.o
22obj-$(CONFIG_SERIO_LIBPS2) += libps2.o 22obj-$(CONFIG_SERIO_LIBPS2) += libps2.o
23obj-$(CONFIG_SERIO_RAW) += serio_raw.o 23obj-$(CONFIG_SERIO_RAW) += serio_raw.o
24obj-$(CONFIG_SERIO_XILINX_XPS_PS2) += xilinx_ps2.o
diff --git a/drivers/input/serio/xilinx_ps2.c b/drivers/input/serio/xilinx_ps2.c
new file mode 100644
index 000000000000..0ed044d5e685
--- /dev/null
+++ b/drivers/input/serio/xilinx_ps2.c
@@ -0,0 +1,380 @@
1/*
2 * Xilinx XPS PS/2 device driver
3 *
4 * (c) 2005 MontaVista Software, Inc.
5 * (c) 2008 Xilinx, Inc.
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 *
12 * You should have received a copy of the GNU General Public License along
13 * with this program; if not, write to the Free Software Foundation, Inc.,
14 * 675 Mass Ave, Cambridge, MA 02139, USA.
15 */
16
17
18#include <linux/module.h>
19#include <linux/serio.h>
20#include <linux/interrupt.h>
21#include <linux/errno.h>
22#include <linux/init.h>
23#include <linux/list.h>
24#include <linux/io.h>
25
26#include <linux/of_device.h>
27#include <linux/of_platform.h>
28
29#define DRIVER_NAME "xilinx_ps2"
30
31/* Register offsets for the xps2 device */
32#define XPS2_SRST_OFFSET 0x00000000 /* Software Reset register */
33#define XPS2_STATUS_OFFSET 0x00000004 /* Status register */
34#define XPS2_RX_DATA_OFFSET 0x00000008 /* Receive Data register */
35#define XPS2_TX_DATA_OFFSET 0x0000000C /* Transmit Data register */
36#define XPS2_GIER_OFFSET 0x0000002C /* Global Interrupt Enable reg */
37#define XPS2_IPISR_OFFSET 0x00000030 /* Interrupt Status register */
38#define XPS2_IPIER_OFFSET 0x00000038 /* Interrupt Enable register */
39
40/* Reset Register Bit Definitions */
41#define XPS2_SRST_RESET 0x0000000A /* Software Reset */
42
43/* Status Register Bit Positions */
44#define XPS2_STATUS_RX_FULL 0x00000001 /* Receive Full */
45#define XPS2_STATUS_TX_FULL 0x00000002 /* Transmit Full */
46
47/* Bit definitions for ISR/IER registers. Both the registers have the same bit
48 * definitions and are only defined once. */
49#define XPS2_IPIXR_WDT_TOUT 0x00000001 /* Watchdog Timeout Interrupt */
50#define XPS2_IPIXR_TX_NOACK 0x00000002 /* Transmit No ACK Interrupt */
51#define XPS2_IPIXR_TX_ACK 0x00000004 /* Transmit ACK (Data) Interrupt */
52#define XPS2_IPIXR_RX_OVF 0x00000008 /* Receive Overflow Interrupt */
53#define XPS2_IPIXR_RX_ERR 0x00000010 /* Receive Error Interrupt */
54#define XPS2_IPIXR_RX_FULL 0x00000020 /* Receive Data Interrupt */
55
56/* Mask for all the Transmit Interrupts */
57#define XPS2_IPIXR_TX_ALL (XPS2_IPIXR_TX_NOACK | XPS2_IPIXR_TX_ACK)
58
59/* Mask for all the Receive Interrupts */
60#define XPS2_IPIXR_RX_ALL (XPS2_IPIXR_RX_OVF | XPS2_IPIXR_RX_ERR | \
61 XPS2_IPIXR_RX_FULL)
62
63/* Mask for all the Interrupts */
64#define XPS2_IPIXR_ALL (XPS2_IPIXR_TX_ALL | XPS2_IPIXR_RX_ALL | \
65 XPS2_IPIXR_WDT_TOUT)
66
67/* Global Interrupt Enable mask */
68#define XPS2_GIER_GIE_MASK 0x80000000
69
70struct xps2data {
71 int irq;
72 u32 phys_addr;
73 u32 remap_size;
74 spinlock_t lock;
75 u8 rxb; /* Rx buffer */
76 void __iomem *base_address; /* virt. address of control registers */
77 unsigned int dfl;
78 struct serio serio; /* serio */
79};
80
81/************************************/
82/* XPS PS/2 data transmission calls */
83/************************************/
84
85/*
86 * xps2_recv() will attempt to receive a byte of data from the PS/2 port.
87 */
88static int xps2_recv(struct xps2data *drvdata, u8 *byte)
89{
90 u32 sr;
91 int status = -1;
92
93 /* If there is data available in the PS/2 receiver, read it */
94 sr = in_be32(drvdata->base_address + XPS2_STATUS_OFFSET);
95 if (sr & XPS2_STATUS_RX_FULL) {
96 *byte = in_be32(drvdata->base_address + XPS2_RX_DATA_OFFSET);
97 status = 0;
98 }
99
100 return status;
101}
102
103/*********************/
104/* Interrupt handler */
105/*********************/
106static irqreturn_t xps2_interrupt(int irq, void *dev_id)
107{
108 struct xps2data *drvdata = dev_id;
109 u32 intr_sr;
110 u8 c;
111 int status;
112
113 /* Get the PS/2 interrupts and clear them */
114 intr_sr = in_be32(drvdata->base_address + XPS2_IPISR_OFFSET);
115 out_be32(drvdata->base_address + XPS2_IPISR_OFFSET, intr_sr);
116
117 /* Check which interrupt is active */
118 if (intr_sr & XPS2_IPIXR_RX_OVF)
119 printk(KERN_WARNING "%s: receive overrun error\n",
120 drvdata->serio.name);
121
122 if (intr_sr & XPS2_IPIXR_RX_ERR)
123 drvdata->dfl |= SERIO_PARITY;
124
125 if (intr_sr & (XPS2_IPIXR_TX_NOACK | XPS2_IPIXR_WDT_TOUT))
126 drvdata->dfl |= SERIO_TIMEOUT;
127
128 if (intr_sr & XPS2_IPIXR_RX_FULL) {
129 status = xps2_recv(drvdata, &drvdata->rxb);
130
131 /* Error, if a byte is not received */
132 if (status) {
133 printk(KERN_ERR
134 "%s: wrong rcvd byte count (%d)\n",
135 drvdata->serio.name, status);
136 } else {
137 c = drvdata->rxb;
138 serio_interrupt(&drvdata->serio, c, drvdata->dfl);
139 drvdata->dfl = 0;
140 }
141 }
142
143 if (intr_sr & XPS2_IPIXR_TX_ACK)
144 drvdata->dfl = 0;
145
146 return IRQ_HANDLED;
147}
148
149/*******************/
150/* serio callbacks */
151/*******************/
152
153/*
154 * sxps2_write() sends a byte out through the PS/2 interface.
155 */
156static int sxps2_write(struct serio *pserio, unsigned char c)
157{
158 struct xps2data *drvdata = pserio->port_data;
159 unsigned long flags;
160 u32 sr;
161 int status = -1;
162
163 spin_lock_irqsave(&drvdata->lock, flags);
164
165 /* If the PS/2 transmitter is empty send a byte of data */
166 sr = in_be32(drvdata->base_address + XPS2_STATUS_OFFSET);
167 if (!(sr & XPS2_STATUS_TX_FULL)) {
168 out_be32(drvdata->base_address + XPS2_TX_DATA_OFFSET, c);
169 status = 0;
170 }
171
172 spin_unlock_irqrestore(&drvdata->lock, flags);
173
174 return status;
175}
176
177/*
178 * sxps2_open() is called when a port is open by the higher layer.
179 */
180static int sxps2_open(struct serio *pserio)
181{
182 struct xps2data *drvdata = pserio->port_data;
183 int retval;
184
185 retval = request_irq(drvdata->irq, &xps2_interrupt, 0,
186 DRIVER_NAME, drvdata);
187 if (retval) {
188 printk(KERN_ERR
189 "%s: Couldn't allocate interrupt %d\n",
190 drvdata->serio.name, drvdata->irq);
191 return retval;
192 }
193
194 /* start reception by enabling the interrupts */
195 out_be32(drvdata->base_address + XPS2_GIER_OFFSET, XPS2_GIER_GIE_MASK);
196 out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, XPS2_IPIXR_RX_ALL);
197 (void)xps2_recv(drvdata, &drvdata->rxb);
198
199 return 0; /* success */
200}
201
202/*
203 * sxps2_close() frees the interrupt.
204 */
205static void sxps2_close(struct serio *pserio)
206{
207 struct xps2data *drvdata = pserio->port_data;
208
209 /* Disable the PS2 interrupts */
210 out_be32(drvdata->base_address + XPS2_GIER_OFFSET, 0x00);
211 out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, 0x00);
212 free_irq(drvdata->irq, drvdata);
213}
214
215/*********************/
216/* Device setup code */
217/*********************/
218
219static int xps2_setup(struct device *dev, struct resource *regs_res,
220 struct resource *irq_res)
221{
222 struct xps2data *drvdata;
223 struct serio *serio;
224 unsigned long remap_size;
225 int retval;
226
227 if (!dev)
228 return -EINVAL;
229
230 if (!regs_res || !irq_res) {
231 dev_err(dev, "IO resource(s) not found\n");
232 return -EINVAL;
233 }
234
235 drvdata = kzalloc(sizeof(struct xps2data), GFP_KERNEL);
236 if (!drvdata) {
237 dev_err(dev, "Couldn't allocate device private record\n");
238 return -ENOMEM;
239 }
240
241 dev_set_drvdata(dev, drvdata);
242
243 spin_lock_init(&drvdata->lock);
244 drvdata->irq = irq_res->start;
245
246 remap_size = regs_res->end - regs_res->start + 1;
247 if (!request_mem_region(regs_res->start, remap_size, DRIVER_NAME)) {
248 dev_err(dev, "Couldn't lock memory region at 0x%08X\n",
249 (unsigned int)regs_res->start);
250 retval = -EBUSY;
251 goto failed1;
252 }
253
254 /* Fill in configuration data and add them to the list */
255 drvdata->phys_addr = regs_res->start;
256 drvdata->remap_size = remap_size;
257 drvdata->base_address = ioremap(regs_res->start, remap_size);
258 if (drvdata->base_address == NULL) {
259 dev_err(dev, "Couldn't ioremap memory at 0x%08X\n",
260 (unsigned int)regs_res->start);
261 retval = -EFAULT;
262 goto failed2;
263 }
264
265 /* Disable all the interrupts, just in case */
266 out_be32(drvdata->base_address + XPS2_IPIER_OFFSET, 0);
267
268 /* Reset the PS2 device and abort any current transaction, to make sure
269 * we have the PS2 in a good state */
270 out_be32(drvdata->base_address + XPS2_SRST_OFFSET, XPS2_SRST_RESET);
271
272 dev_info(dev, "Xilinx PS2 at 0x%08X mapped to 0x%08X, irq=%d\n",
273 drvdata->phys_addr, (u32)drvdata->base_address, drvdata->irq);
274
275 serio = &drvdata->serio;
276 serio->id.type = SERIO_8042;
277 serio->write = sxps2_write;
278 serio->open = sxps2_open;
279 serio->close = sxps2_close;
280 serio->port_data = drvdata;
281 serio->dev.parent = dev;
282 snprintf(serio->name, sizeof(serio->name),
283 "Xilinx XPS PS/2 at %08X", drvdata->phys_addr);
284 snprintf(serio->phys, sizeof(serio->phys),
285 "xilinxps2/serio at %08X", drvdata->phys_addr);
286 serio_register_port(serio);
287
288 return 0; /* success */
289
290failed2:
291 release_mem_region(regs_res->start, remap_size);
292failed1:
293 kfree(drvdata);
294 dev_set_drvdata(dev, NULL);
295
296 return retval;
297}
298
299/***************************/
300/* OF Platform Bus Support */
301/***************************/
302
303static int __devinit xps2_of_probe(struct of_device *ofdev, const struct
304 of_device_id * match)
305{
306 struct resource r_irq; /* Interrupt resources */
307 struct resource r_mem; /* IO mem resources */
308 int rc = 0;
309
310 printk(KERN_INFO "Device Tree Probing \'%s\'\n",
311 ofdev->node->name);
312
313 /* Get iospace for the device */
314 rc = of_address_to_resource(ofdev->node, 0, &r_mem);
315 if (rc) {
316 dev_err(&ofdev->dev, "invalid address\n");
317 return rc;
318 }
319
320 /* Get IRQ for the device */
321 rc = of_irq_to_resource(ofdev->node, 0, &r_irq);
322 if (rc == NO_IRQ) {
323 dev_err(&ofdev->dev, "no IRQ found\n");
324 return rc;
325 }
326
327 return xps2_setup(&ofdev->dev, &r_mem, &r_irq);
328}
329
330static int __devexit xps2_of_remove(struct of_device *of_dev)
331{
332 struct device *dev = &of_dev->dev;
333 struct xps2data *drvdata;
334
335 if (!dev)
336 return -EINVAL;
337
338 drvdata = dev_get_drvdata(dev);
339
340 serio_unregister_port(&drvdata->serio);
341 iounmap(drvdata->base_address);
342 release_mem_region(drvdata->phys_addr, drvdata->remap_size);
343 kfree(drvdata);
344
345 dev_set_drvdata(dev, NULL);
346
347 return 0; /* success */
348}
349
350/* Match table for of_platform binding */
351static struct of_device_id xps2_of_match[] __devinitdata = {
352 { .compatible = "xlnx,xps-ps2-1.00.a", },
353 { /* end of list */ },
354};
355MODULE_DEVICE_TABLE(of, xps2_of_match);
356
357static struct of_platform_driver xps2_of_driver = {
358 .name = DRIVER_NAME,
359 .match_table = xps2_of_match,
360 .probe = xps2_of_probe,
361 .remove = __devexit_p(xps2_of_remove),
362};
363
364static int __init xps2_init(void)
365{
366 return of_register_platform_driver(&xps2_of_driver);
367}
368
369static void __exit xps2_cleanup(void)
370{
371 of_unregister_platform_driver(&xps2_of_driver);
372}
373
374module_init(xps2_init);
375module_exit(xps2_cleanup);
376
377MODULE_AUTHOR("Xilinx, Inc.");
378MODULE_DESCRIPTION("Xilinx XPS PS/2 driver");
379MODULE_LICENSE("GPL");
380