Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 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/module.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | #include <linux/input.h> |
| 14 | #include <linux/serio.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/io.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/slab.h> |
| 19 | |
| 20 | #define ARC_PS2_PORTS 2 |
| 21 | |
| 22 | #define ARC_ARC_PS2_ID 0x0001f609 |
| 23 | |
| 24 | #define STAT_TIMEOUT 128 |
| 25 | |
| 26 | #define PS2_STAT_RX_FRM_ERR (1) |
| 27 | #define PS2_STAT_RX_BUF_OVER (1 << 1) |
| 28 | #define PS2_STAT_RX_INT_EN (1 << 2) |
| 29 | #define PS2_STAT_RX_VAL (1 << 3) |
| 30 | #define PS2_STAT_TX_ISNOT_FUL (1 << 4) |
| 31 | #define PS2_STAT_TX_INT_EN (1 << 5) |
| 32 | |
| 33 | struct arc_ps2_port { |
| 34 | void __iomem *data_addr; |
| 35 | void __iomem *status_addr; |
| 36 | struct serio *io; |
| 37 | }; |
| 38 | |
| 39 | struct arc_ps2_data { |
| 40 | struct arc_ps2_port port[ARC_PS2_PORTS]; |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 41 | void __iomem *addr; |
| 42 | unsigned int frame_error; |
| 43 | unsigned int buf_overflow; |
| 44 | unsigned int total_int; |
| 45 | }; |
| 46 | |
| 47 | static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2, |
| 48 | struct arc_ps2_port *port) |
| 49 | { |
| 50 | unsigned int timeout = 1000; |
| 51 | unsigned int flag, status; |
| 52 | unsigned char data; |
| 53 | |
| 54 | do { |
| 55 | status = ioread32(port->status_addr); |
| 56 | if (!(status & PS2_STAT_RX_VAL)) |
| 57 | return; |
| 58 | |
| 59 | data = ioread32(port->data_addr) & 0xff; |
| 60 | |
| 61 | flag = 0; |
| 62 | arc_ps2->total_int++; |
| 63 | if (status & PS2_STAT_RX_FRM_ERR) { |
| 64 | arc_ps2->frame_error++; |
| 65 | flag |= SERIO_PARITY; |
| 66 | } else if (status & PS2_STAT_RX_BUF_OVER) { |
| 67 | arc_ps2->buf_overflow++; |
| 68 | flag |= SERIO_FRAME; |
| 69 | } |
| 70 | |
| 71 | serio_interrupt(port->io, data, flag); |
| 72 | } while (--timeout); |
| 73 | |
| 74 | dev_err(&port->io->dev, "PS/2 hardware stuck\n"); |
| 75 | } |
| 76 | |
| 77 | static irqreturn_t arc_ps2_interrupt(int irq, void *dev) |
| 78 | { |
| 79 | struct arc_ps2_data *arc_ps2 = dev; |
| 80 | int i; |
| 81 | |
| 82 | for (i = 0; i < ARC_PS2_PORTS; i++) |
| 83 | arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]); |
| 84 | |
| 85 | return IRQ_HANDLED; |
| 86 | } |
| 87 | |
| 88 | static int arc_ps2_write(struct serio *io, unsigned char val) |
| 89 | { |
| 90 | unsigned status; |
| 91 | struct arc_ps2_port *port = io->port_data; |
| 92 | int timeout = STAT_TIMEOUT; |
| 93 | |
| 94 | do { |
| 95 | status = ioread32(port->status_addr); |
| 96 | cpu_relax(); |
| 97 | |
| 98 | if (status & PS2_STAT_TX_ISNOT_FUL) { |
| 99 | iowrite32(val & 0xff, port->data_addr); |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | } while (--timeout); |
| 104 | |
| 105 | dev_err(&io->dev, "write timeout\n"); |
| 106 | return -ETIMEDOUT; |
| 107 | } |
| 108 | |
| 109 | static int arc_ps2_open(struct serio *io) |
| 110 | { |
| 111 | struct arc_ps2_port *port = io->port_data; |
| 112 | |
| 113 | iowrite32(PS2_STAT_RX_INT_EN, port->status_addr); |
| 114 | |
| 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static void arc_ps2_close(struct serio *io) |
| 119 | { |
| 120 | struct arc_ps2_port *port = io->port_data; |
| 121 | |
| 122 | iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN, |
| 123 | port->status_addr); |
| 124 | } |
| 125 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 126 | static void __iomem *arc_ps2_calc_addr(struct arc_ps2_data *arc_ps2, |
Dmitry Torokhov | a4d6983 | 2012-10-24 23:53:01 -0700 | [diff] [blame] | 127 | int index, bool status) |
| 128 | { |
| 129 | void __iomem *addr; |
| 130 | |
| 131 | addr = arc_ps2->addr + 4 + 4 * index; |
| 132 | if (status) |
| 133 | addr += ARC_PS2_PORTS * 4; |
| 134 | |
| 135 | return addr; |
| 136 | } |
| 137 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 138 | static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2) |
Dmitry Torokhov | a4d6983 | 2012-10-24 23:53:01 -0700 | [diff] [blame] | 139 | { |
| 140 | void __iomem *addr; |
| 141 | u32 val; |
| 142 | int i; |
| 143 | |
| 144 | for (i = 0; i < ARC_PS2_PORTS; i++) { |
| 145 | addr = arc_ps2_calc_addr(arc_ps2, i, true); |
| 146 | val = ioread32(addr); |
| 147 | val &= ~(PS2_STAT_RX_INT_EN | PS2_STAT_TX_INT_EN); |
| 148 | iowrite32(val, addr); |
| 149 | } |
| 150 | } |
| 151 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 152 | static int arc_ps2_create_port(struct platform_device *pdev, |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 153 | struct arc_ps2_data *arc_ps2, |
| 154 | int index) |
| 155 | { |
| 156 | struct arc_ps2_port *port = &arc_ps2->port[index]; |
| 157 | struct serio *io; |
| 158 | |
| 159 | io = kzalloc(sizeof(struct serio), GFP_KERNEL); |
| 160 | if (!io) |
| 161 | return -ENOMEM; |
| 162 | |
| 163 | io->id.type = SERIO_8042; |
| 164 | io->write = arc_ps2_write; |
| 165 | io->open = arc_ps2_open; |
| 166 | io->close = arc_ps2_close; |
| 167 | snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index); |
| 168 | snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index); |
| 169 | io->port_data = port; |
| 170 | |
| 171 | port->io = io; |
| 172 | |
Dmitry Torokhov | a4d6983 | 2012-10-24 23:53:01 -0700 | [diff] [blame] | 173 | port->data_addr = arc_ps2_calc_addr(arc_ps2, index, false); |
| 174 | port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true); |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 175 | |
| 176 | dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n", |
| 177 | index, port->data_addr, port->status_addr); |
| 178 | |
| 179 | serio_register_port(port->io); |
| 180 | return 0; |
| 181 | } |
| 182 | |
Bill Pemberton | 5298cc4 | 2012-11-23 21:38:25 -0800 | [diff] [blame] | 183 | static int arc_ps2_probe(struct platform_device *pdev) |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 184 | { |
| 185 | struct arc_ps2_data *arc_ps2; |
Dmitry Torokhov | a4d6983 | 2012-10-24 23:53:01 -0700 | [diff] [blame] | 186 | struct resource *res; |
| 187 | int irq; |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 188 | int error, id, i; |
| 189 | |
Dmitry Torokhov | a4d6983 | 2012-10-24 23:53:01 -0700 | [diff] [blame] | 190 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 191 | if (!res) { |
| 192 | dev_err(&pdev->dev, "no IO memory defined\n"); |
| 193 | return -EINVAL; |
| 194 | } |
| 195 | |
| 196 | irq = platform_get_irq_byname(pdev, "arc_ps2_irq"); |
| 197 | if (irq < 0) { |
| 198 | dev_err(&pdev->dev, "no IRQ defined\n"); |
| 199 | return -EINVAL; |
| 200 | } |
| 201 | |
| 202 | arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data), |
| 203 | GFP_KERNEL); |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 204 | if (!arc_ps2) { |
| 205 | dev_err(&pdev->dev, "out of memory\n"); |
| 206 | return -ENOMEM; |
| 207 | } |
| 208 | |
Dmitry Torokhov | a4d6983 | 2012-10-24 23:53:01 -0700 | [diff] [blame] | 209 | arc_ps2->addr = devm_request_and_ioremap(&pdev->dev, res); |
| 210 | if (!arc_ps2->addr) |
| 211 | return -EBUSY; |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 212 | |
| 213 | dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n", |
Dmitry Torokhov | a4d6983 | 2012-10-24 23:53:01 -0700 | [diff] [blame] | 214 | irq, arc_ps2->addr, ARC_PS2_PORTS); |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 215 | |
| 216 | id = ioread32(arc_ps2->addr); |
| 217 | if (id != ARC_ARC_PS2_ID) { |
| 218 | dev_err(&pdev->dev, "device id does not match\n"); |
Dmitry Torokhov | a4d6983 | 2012-10-24 23:53:01 -0700 | [diff] [blame] | 219 | return -ENXIO; |
| 220 | } |
| 221 | |
| 222 | arc_ps2_inhibit_ports(arc_ps2); |
| 223 | |
| 224 | error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt, |
| 225 | 0, "arc_ps2", arc_ps2); |
| 226 | if (error) { |
| 227 | dev_err(&pdev->dev, "Could not allocate IRQ\n"); |
| 228 | return error; |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | for (i = 0; i < ARC_PS2_PORTS; i++) { |
| 232 | error = arc_ps2_create_port(pdev, arc_ps2, i); |
Dmitry Torokhov | a4d6983 | 2012-10-24 23:53:01 -0700 | [diff] [blame] | 233 | if (error) { |
| 234 | while (--i >= 0) |
| 235 | serio_unregister_port(arc_ps2->port[i].io); |
| 236 | return error; |
| 237 | } |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | platform_set_drvdata(pdev, arc_ps2); |
| 241 | |
| 242 | return 0; |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Bill Pemberton | e2619cf | 2012-11-23 21:50:47 -0800 | [diff] [blame] | 245 | static int arc_ps2_remove(struct platform_device *pdev) |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 246 | { |
| 247 | struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev); |
| 248 | int i; |
| 249 | |
| 250 | for (i = 0; i < ARC_PS2_PORTS; i++) |
| 251 | serio_unregister_port(arc_ps2->port[i].io); |
| 252 | |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 253 | dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int); |
| 254 | dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error); |
| 255 | dev_dbg(&pdev->dev, "buffer overflow count = %i\n", |
| 256 | arc_ps2->buf_overflow); |
| 257 | |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 258 | return 0; |
| 259 | } |
| 260 | |
| 261 | static struct platform_driver arc_ps2_driver = { |
| 262 | .driver = { |
| 263 | .name = "arc_ps2", |
| 264 | .owner = THIS_MODULE, |
| 265 | }, |
| 266 | .probe = arc_ps2_probe, |
Bill Pemberton | 1cb0aa8 | 2012-11-23 21:27:39 -0800 | [diff] [blame] | 267 | .remove = arc_ps2_remove, |
Mischa Jonker | e4b2900 | 2012-10-22 22:48:08 -0700 | [diff] [blame] | 268 | }; |
| 269 | |
| 270 | module_platform_driver(arc_ps2_driver); |
| 271 | |
| 272 | MODULE_LICENSE("GPL"); |
| 273 | MODULE_AUTHOR("Pavel Sokolov <psokolov@synopsys.com>"); |
| 274 | MODULE_DESCRIPTION("ARC PS/2 Driver"); |