1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2000-2001 Vojtech Pavlik 4 * Copyright (c) 2002 Russell King 5 */ 6 7 /* 8 * Acorn RiscPC PS/2 keyboard controller driver for Linux/ARM 9 */ 10 11 #include <linux/module.h> 12 #include <linux/interrupt.h> 13 #include <linux/serio.h> 14 #include <linux/err.h> 15 #include <linux/platform_device.h> 16 #include <linux/io.h> 17 #include <linux/slab.h> 18 19 #include <mach/hardware.h> 20 #include <asm/hardware/iomd.h> 21 22 MODULE_AUTHOR("Vojtech Pavlik, Russell King"); 23 MODULE_DESCRIPTION("Acorn RiscPC PS/2 keyboard controller driver"); 24 MODULE_LICENSE("GPL"); 25 MODULE_ALIAS("platform:kart"); 26 27 struct rpckbd_data { 28 int tx_irq; 29 int rx_irq; 30 }; 31 32 static int rpckbd_write(struct serio *port, unsigned char val) 33 { 34 while (!(iomd_readb(IOMD_KCTRL) & (1 << 7))) 35 cpu_relax(); 36 37 iomd_writeb(val, IOMD_KARTTX); 38 39 return 0; 40 } 41 42 static irqreturn_t rpckbd_rx(int irq, void *dev_id) 43 { 44 struct serio *port = dev_id; 45 unsigned int byte; 46 int handled = IRQ_NONE; 47 48 while (iomd_readb(IOMD_KCTRL) & (1 << 5)) { 49 byte = iomd_readb(IOMD_KARTRX); 50 51 serio_interrupt(port, byte, 0); 52 handled = IRQ_HANDLED; 53 } 54 return handled; 55 } 56 57 static irqreturn_t rpckbd_tx(int irq, void *dev_id) 58 { 59 return IRQ_HANDLED; 60 } 61 62 static int rpckbd_open(struct serio *port) 63 { 64 struct rpckbd_data *rpckbd = port->port_data; 65 66 /* Reset the keyboard state machine. */ 67 iomd_writeb(0, IOMD_KCTRL); 68 iomd_writeb(8, IOMD_KCTRL); 69 iomd_readb(IOMD_KARTRX); 70 71 if (request_irq(rpckbd->rx_irq, rpckbd_rx, 0, "rpckbd", port) != 0) { 72 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard receive IRQ\n"); 73 return -EBUSY; 74 } 75 76 if (request_irq(rpckbd->tx_irq, rpckbd_tx, 0, "rpckbd", port) != 0) { 77 printk(KERN_ERR "rpckbd.c: Could not allocate keyboard transmit IRQ\n"); 78 free_irq(rpckbd->rx_irq, port); 79 return -EBUSY; 80 } 81 82 return 0; 83 } 84 85 static void rpckbd_close(struct serio *port) 86 { 87 struct rpckbd_data *rpckbd = port->port_data; 88 89 free_irq(rpckbd->rx_irq, port); 90 free_irq(rpckbd->tx_irq, port); 91 } 92 93 /* 94 * Allocate and initialize serio structure for subsequent registration 95 * with serio core. 96 */ 97 static int rpckbd_probe(struct platform_device *dev) 98 { 99 struct rpckbd_data *rpckbd; 100 struct serio *serio; 101 int tx_irq, rx_irq; 102 103 rx_irq = platform_get_irq(dev, 0); 104 if (rx_irq < 0) 105 return rx_irq; 106 107 tx_irq = platform_get_irq(dev, 1); 108 if (tx_irq < 0) 109 return tx_irq; 110 111 serio = kzalloc(sizeof(struct serio), GFP_KERNEL); 112 rpckbd = kzalloc(sizeof(*rpckbd), GFP_KERNEL); 113 if (!serio || !rpckbd) { 114 kfree(rpckbd); 115 kfree(serio); 116 return -ENOMEM; 117 } 118 119 rpckbd->rx_irq = rx_irq; 120 rpckbd->tx_irq = tx_irq; 121 122 serio->id.type = SERIO_8042; 123 serio->write = rpckbd_write; 124 serio->open = rpckbd_open; 125 serio->close = rpckbd_close; 126 serio->dev.parent = &dev->dev; 127 serio->port_data = rpckbd; 128 strscpy(serio->name, "RiscPC PS/2 kbd port", sizeof(serio->name)); 129 strscpy(serio->phys, "rpckbd/serio0", sizeof(serio->phys)); 130 131 platform_set_drvdata(dev, serio); 132 serio_register_port(serio); 133 return 0; 134 } 135 136 static int rpckbd_remove(struct platform_device *dev) 137 { 138 struct serio *serio = platform_get_drvdata(dev); 139 struct rpckbd_data *rpckbd = serio->port_data; 140 141 serio_unregister_port(serio); 142 kfree(rpckbd); 143 144 return 0; 145 } 146 147 static struct platform_driver rpckbd_driver = { 148 .probe = rpckbd_probe, 149 .remove = rpckbd_remove, 150 .driver = { 151 .name = "kart", 152 }, 153 }; 154 module_platform_driver(rpckbd_driver); 155