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Linux/drivers/input/serio/arc_ps2.c

  1 /*
  2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  *
  8  * Driver is originally developed by Pavel Sokolov <psokolov@synopsys.com>
  9  */
 10 
 11 #include <linux/err.h>
 12 #include <linux/module.h>
 13 #include <linux/interrupt.h>
 14 #include <linux/input.h>
 15 #include <linux/serio.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/of.h>
 18 #include <linux/io.h>
 19 #include <linux/kernel.h>
 20 #include <linux/slab.h>
 21 
 22 #define ARC_PS2_PORTS                   2
 23 
 24 #define ARC_ARC_PS2_ID                  0x0001f609
 25 
 26 #define STAT_TIMEOUT                    128
 27 
 28 #define PS2_STAT_RX_FRM_ERR             (1)
 29 #define PS2_STAT_RX_BUF_OVER            (1 << 1)
 30 #define PS2_STAT_RX_INT_EN              (1 << 2)
 31 #define PS2_STAT_RX_VAL                 (1 << 3)
 32 #define PS2_STAT_TX_ISNOT_FUL           (1 << 4)
 33 #define PS2_STAT_TX_INT_EN              (1 << 5)
 34 
 35 struct arc_ps2_port {
 36         void __iomem *data_addr;
 37         void __iomem *status_addr;
 38         struct serio *io;
 39 };
 40 
 41 struct arc_ps2_data {
 42         struct arc_ps2_port port[ARC_PS2_PORTS];
 43         void __iomem *addr;
 44         unsigned int frame_error;
 45         unsigned int buf_overflow;
 46         unsigned int total_int;
 47 };
 48 
 49 static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2,
 50                              struct arc_ps2_port *port)
 51 {
 52         unsigned int timeout = 1000;
 53         unsigned int flag, status;
 54         unsigned char data;
 55 
 56         do {
 57                 status = ioread32(port->status_addr);
 58                 if (!(status & PS2_STAT_RX_VAL))
 59                         return;
 60 
 61                 data = ioread32(port->data_addr) & 0xff;
 62 
 63                 flag = 0;
 64                 arc_ps2->total_int++;
 65                 if (status & PS2_STAT_RX_FRM_ERR) {
 66                         arc_ps2->frame_error++;
 67                         flag |= SERIO_PARITY;
 68                 } else if (status & PS2_STAT_RX_BUF_OVER) {
 69                         arc_ps2->buf_overflow++;
 70                         flag |= SERIO_FRAME;
 71                 }
 72 
 73                 serio_interrupt(port->io, data, flag);
 74         } while (--timeout);
 75 
 76         dev_err(&port->io->dev, "PS/2 hardware stuck\n");
 77 }
 78 
 79 static irqreturn_t arc_ps2_interrupt(int irq, void *dev)
 80 {
 81         struct arc_ps2_data *arc_ps2 = dev;
 82         int i;
 83 
 84         for (i = 0; i < ARC_PS2_PORTS; i++)
 85                 arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]);
 86 
 87         return IRQ_HANDLED;
 88 }
 89 
 90 static int arc_ps2_write(struct serio *io, unsigned char val)
 91 {
 92         unsigned status;
 93         struct arc_ps2_port *port = io->port_data;
 94         int timeout = STAT_TIMEOUT;
 95 
 96         do {
 97                 status = ioread32(port->status_addr);
 98                 cpu_relax();
 99 
100                 if (status & PS2_STAT_TX_ISNOT_FUL) {
101                         iowrite32(val & 0xff, port->data_addr);
102                         return 0;
103                 }
104 
105         } while (--timeout);
106 
107         dev_err(&io->dev, "write timeout\n");
108         return -ETIMEDOUT;
109 }
110 
111 static int arc_ps2_open(struct serio *io)
112 {
113         struct arc_ps2_port *port = io->port_data;
114 
115         iowrite32(PS2_STAT_RX_INT_EN, port->status_addr);
116 
117         return 0;
118 }
119 
120 static void arc_ps2_close(struct serio *io)
121 {
122         struct arc_ps2_port *port = io->port_data;
123 
124         iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN,
125                   port->status_addr);
126 }
127 
128 static void __iomem *arc_ps2_calc_addr(struct arc_ps2_data *arc_ps2,
129                                                   int index, bool status)
130 {
131         void __iomem *addr;
132 
133         addr = arc_ps2->addr + 4 + 4 * index;
134         if (status)
135                 addr += ARC_PS2_PORTS * 4;
136 
137         return addr;
138 }
139 
140 static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2)
141 {
142         void __iomem *addr;
143         u32 val;
144         int i;
145 
146         for (i = 0; i < ARC_PS2_PORTS; i++) {
147                 addr = arc_ps2_calc_addr(arc_ps2, i, true);
148                 val = ioread32(addr);
149                 val &= ~(PS2_STAT_RX_INT_EN | PS2_STAT_TX_INT_EN);
150                 iowrite32(val, addr);
151         }
152 }
153 
154 static int arc_ps2_create_port(struct platform_device *pdev,
155                                          struct arc_ps2_data *arc_ps2,
156                                          int index)
157 {
158         struct arc_ps2_port *port = &arc_ps2->port[index];
159         struct serio *io;
160 
161         io = kzalloc(sizeof(struct serio), GFP_KERNEL);
162         if (!io)
163                 return -ENOMEM;
164 
165         io->id.type = SERIO_8042;
166         io->write = arc_ps2_write;
167         io->open = arc_ps2_open;
168         io->close = arc_ps2_close;
169         snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index);
170         snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index);
171         io->port_data = port;
172 
173         port->io = io;
174 
175         port->data_addr = arc_ps2_calc_addr(arc_ps2, index, false);
176         port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true);
177 
178         dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n",
179                 index, port->data_addr, port->status_addr);
180 
181         serio_register_port(port->io);
182         return 0;
183 }
184 
185 static int arc_ps2_probe(struct platform_device *pdev)
186 {
187         struct arc_ps2_data *arc_ps2;
188         struct resource *res;
189         int irq;
190         int error, id, i;
191 
192         irq = platform_get_irq_byname(pdev, "arc_ps2_irq");
193         if (irq < 0) {
194                 dev_err(&pdev->dev, "no IRQ defined\n");
195                 return -EINVAL;
196         }
197 
198         arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data),
199                                 GFP_KERNEL);
200         if (!arc_ps2) {
201                 dev_err(&pdev->dev, "out of memory\n");
202                 return -ENOMEM;
203         }
204 
205         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
206         arc_ps2->addr = devm_ioremap_resource(&pdev->dev, res);
207         if (IS_ERR(arc_ps2->addr))
208                 return PTR_ERR(arc_ps2->addr);
209 
210         dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n",
211                  irq, arc_ps2->addr, ARC_PS2_PORTS);
212 
213         id = ioread32(arc_ps2->addr);
214         if (id != ARC_ARC_PS2_ID) {
215                 dev_err(&pdev->dev, "device id does not match\n");
216                 return -ENXIO;
217         }
218 
219         arc_ps2_inhibit_ports(arc_ps2);
220 
221         error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt,
222                                  0, "arc_ps2", arc_ps2);
223         if (error) {
224                 dev_err(&pdev->dev, "Could not allocate IRQ\n");
225                 return error;
226         }
227 
228         for (i = 0; i < ARC_PS2_PORTS; i++) {
229                 error = arc_ps2_create_port(pdev, arc_ps2, i);
230                 if (error) {
231                         while (--i >= 0)
232                                 serio_unregister_port(arc_ps2->port[i].io);
233                         return error;
234                 }
235         }
236 
237         platform_set_drvdata(pdev, arc_ps2);
238 
239         return 0;
240 }
241 
242 static int arc_ps2_remove(struct platform_device *pdev)
243 {
244         struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev);
245         int i;
246 
247         for (i = 0; i < ARC_PS2_PORTS; i++)
248                 serio_unregister_port(arc_ps2->port[i].io);
249 
250         dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int);
251         dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error);
252         dev_dbg(&pdev->dev, "buffer overflow count = %i\n",
253                 arc_ps2->buf_overflow);
254 
255         return 0;
256 }
257 
258 #ifdef CONFIG_OF
259 static const struct of_device_id arc_ps2_match[] = {
260         { .compatible = "snps,arc_ps2" },
261         { },
262 };
263 MODULE_DEVICE_TABLE(of, arc_ps2_match);
264 #endif
265 
266 static struct platform_driver arc_ps2_driver = {
267         .driver = {
268                 .name           = "arc_ps2",
269                 .owner          = THIS_MODULE,
270                 .of_match_table = of_match_ptr(arc_ps2_match),
271         },
272         .probe  = arc_ps2_probe,
273         .remove = arc_ps2_remove,
274 };
275 
276 module_platform_driver(arc_ps2_driver);
277 
278 MODULE_LICENSE("GPL");
279 MODULE_AUTHOR("Pavel Sokolov <psokolov@synopsys.com>");
280 MODULE_DESCRIPTION("ARC PS/2 Driver");
281 

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