1 /* 2 * SGI O2 MACE PS2 controller driver for linux 3 * 4 * Copyright (C) 2002 Vivien Chappelier 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation 9 */ 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/serio.h> 13 #include <linux/errno.h> 14 #include <linux/interrupt.h> 15 #include <linux/ioport.h> 16 #include <linux/delay.h> 17 #include <linux/platform_device.h> 18 #include <linux/slab.h> 19 #include <linux/spinlock.h> 20 #include <linux/err.h> 21 22 #include <asm/io.h> 23 #include <asm/irq.h> 24 #include <asm/system.h> 25 #include <asm/ip32/mace.h> 26 #include <asm/ip32/ip32_ints.h> 27 28 MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org"); 29 MODULE_DESCRIPTION("SGI O2 MACE PS2 controller driver"); 30 MODULE_LICENSE("GPL"); 31 32 #define MACE_PS2_TIMEOUT 10000 /* in 50us unit */ 33 34 #define PS2_STATUS_CLOCK_SIGNAL BIT(0) /* external clock signal */ 35 #define PS2_STATUS_CLOCK_INHIBIT BIT(1) /* clken output signal */ 36 #define PS2_STATUS_TX_INPROGRESS BIT(2) /* transmission in progress */ 37 #define PS2_STATUS_TX_EMPTY BIT(3) /* empty transmit buffer */ 38 #define PS2_STATUS_RX_FULL BIT(4) /* full receive buffer */ 39 #define PS2_STATUS_RX_INPROGRESS BIT(5) /* reception in progress */ 40 #define PS2_STATUS_ERROR_PARITY BIT(6) /* parity error */ 41 #define PS2_STATUS_ERROR_FRAMING BIT(7) /* framing error */ 42 43 #define PS2_CONTROL_TX_CLOCK_DISABLE BIT(0) /* inhibit clock signal after TX */ 44 #define PS2_CONTROL_TX_ENABLE BIT(1) /* transmit enable */ 45 #define PS2_CONTROL_TX_INT_ENABLE BIT(2) /* enable transmit interrupt */ 46 #define PS2_CONTROL_RX_INT_ENABLE BIT(3) /* enable receive interrupt */ 47 #define PS2_CONTROL_RX_CLOCK_ENABLE BIT(4) /* pause reception if set to 0 */ 48 #define PS2_CONTROL_RESET BIT(5) /* reset */ 49 50 struct maceps2_data { 51 struct mace_ps2port *port; 52 int irq; 53 }; 54 55 static struct maceps2_data port_data[2]; 56 static struct serio *maceps2_port[2]; 57 static struct platform_device *maceps2_device; 58 59 static int maceps2_write(struct serio *dev, unsigned char val) 60 { 61 struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port; 62 unsigned int timeout = MACE_PS2_TIMEOUT; 63 64 do { 65 if (port->status & PS2_STATUS_TX_EMPTY) { 66 port->tx = val; 67 return 0; 68 } 69 udelay(50); 70 } while (timeout--); 71 72 return -1; 73 } 74 75 static irqreturn_t maceps2_interrupt(int irq, void *dev_id, 76 struct pt_regs *regs) 77 { 78 struct serio *dev = dev_id; 79 struct mace_ps2port *port = ((struct maceps2_data *)dev->port_data)->port; 80 unsigned long byte; 81 82 if (port->status & PS2_STATUS_RX_FULL) { 83 byte = port->rx; 84 serio_interrupt(dev, byte & 0xff, 0, regs); 85 } 86 87 return IRQ_HANDLED; 88 } 89 90 static int maceps2_open(struct serio *dev) 91 { 92 struct maceps2_data *data = (struct maceps2_data *)dev->port_data; 93 94 if (request_irq(data->irq, maceps2_interrupt, 0, "PS2 port", dev)) { 95 printk(KERN_ERR "Could not allocate PS/2 IRQ\n"); 96 return -EBUSY; 97 } 98 99 /* Reset port */ 100 data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET; 101 udelay(100); 102 103 /* Enable interrupts */ 104 data->port->control = PS2_CONTROL_RX_CLOCK_ENABLE | 105 PS2_CONTROL_TX_ENABLE | 106 PS2_CONTROL_RX_INT_ENABLE; 107 108 return 0; 109 } 110 111 static void maceps2_close(struct serio *dev) 112 { 113 struct maceps2_data *data = (struct maceps2_data *)dev->port_data; 114 115 data->port->control = PS2_CONTROL_TX_CLOCK_DISABLE | PS2_CONTROL_RESET; 116 udelay(100); 117 free_irq(data->irq, dev); 118 } 119 120 121 static struct serio * __devinit maceps2_allocate_port(int idx) 122 { 123 struct serio *serio; 124 125 serio = kzalloc(sizeof(struct serio), GFP_KERNEL); 126 if (serio) { 127 serio->id.type = SERIO_8042; 128 serio->write = maceps2_write; 129 serio->open = maceps2_open; 130 serio->close = maceps2_close; 131 snprintf(serio->name, sizeof(serio->name), "MACE PS/2 port%d", idx); 132 snprintf(serio->phys, sizeof(serio->phys), "mace/serio%d", idx); 133 serio->port_data = &port_data[idx]; 134 serio->dev.parent = &maceps2_device->dev; 135 } 136 137 return serio; 138 } 139 140 static int __devinit maceps2_probe(struct platform_device *dev) 141 { 142 maceps2_port[0] = maceps2_allocate_port(0); 143 maceps2_port[1] = maceps2_allocate_port(1); 144 if (!maceps2_port[0] || !maceps2_port[1]) { 145 kfree(maceps2_port[0]); 146 kfree(maceps2_port[1]); 147 return -ENOMEM; 148 } 149 150 serio_register_port(maceps2_port[0]); 151 serio_register_port(maceps2_port[1]); 152 153 return 0; 154 } 155 156 static int __devexit maceps2_remove(struct platform_device *dev) 157 { 158 serio_unregister_port(maceps2_port[0]); 159 serio_unregister_port(maceps2_port[1]); 160 161 return 0; 162 } 163 164 static struct platform_driver maceps2_driver = { 165 .driver = { 166 .name = "maceps2", 167 .owner = THIS_MODULE, 168 }, 169 .probe = maceps2_probe, 170 .remove = __devexit_p(maceps2_remove), 171 }; 172 173 static int __init maceps2_init(void) 174 { 175 int error; 176 177 error = platform_driver_register(&maceps2_driver); 178 if (error) 179 return error; 180 181 maceps2_device = platform_device_alloc("maceps2", -1); 182 if (!maceps2_device) { 183 error = -ENOMEM; 184 goto err_unregister_driver; 185 } 186 187 port_data[0].port = &mace->perif.ps2.keyb; 188 port_data[0].irq = MACEISA_KEYB_IRQ; 189 port_data[1].port = &mace->perif.ps2.mouse; 190 port_data[1].irq = MACEISA_MOUSE_IRQ; 191 192 error = platform_device_add(maceps2_device); 193 if (error) 194 goto err_free_device; 195 196 return 0; 197 198 err_free_device: 199 platform_device_put(maceps2_device); 200 err_unregister_driver: 201 platform_driver_unregister(&maceps2_driver); 202 return error; 203 } 204 205 static void __exit maceps2_exit(void) 206 { 207 platform_device_unregister(maceps2_device); 208 platform_driver_unregister(&maceps2_driver); 209 } 210 211 module_init(maceps2_init); 212 module_exit(maceps2_exit); 213