1e4b29009SMischa Jonker /* 2e4b29009SMischa Jonker * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3e4b29009SMischa Jonker * 4e4b29009SMischa Jonker * This program is free software; you can redistribute it and/or modify 5e4b29009SMischa Jonker * it under the terms of the GNU General Public License version 2 as 6e4b29009SMischa Jonker * published by the Free Software Foundation. 7e4b29009SMischa Jonker * 8e4b29009SMischa Jonker * Driver is originally developed by Pavel Sokolov <psokolov@synopsys.com> 9e4b29009SMischa Jonker */ 10e4b29009SMischa Jonker 118d1cbc98SThierry Reding #include <linux/err.h> 12e4b29009SMischa Jonker #include <linux/module.h> 13e4b29009SMischa Jonker #include <linux/interrupt.h> 14e4b29009SMischa Jonker #include <linux/input.h> 15e4b29009SMischa Jonker #include <linux/serio.h> 16e4b29009SMischa Jonker #include <linux/platform_device.h> 17e4b29009SMischa Jonker #include <linux/io.h> 18e4b29009SMischa Jonker #include <linux/kernel.h> 19e4b29009SMischa Jonker #include <linux/slab.h> 20e4b29009SMischa Jonker 21e4b29009SMischa Jonker #define ARC_PS2_PORTS 2 22e4b29009SMischa Jonker 23e4b29009SMischa Jonker #define ARC_ARC_PS2_ID 0x0001f609 24e4b29009SMischa Jonker 25e4b29009SMischa Jonker #define STAT_TIMEOUT 128 26e4b29009SMischa Jonker 27e4b29009SMischa Jonker #define PS2_STAT_RX_FRM_ERR (1) 28e4b29009SMischa Jonker #define PS2_STAT_RX_BUF_OVER (1 << 1) 29e4b29009SMischa Jonker #define PS2_STAT_RX_INT_EN (1 << 2) 30e4b29009SMischa Jonker #define PS2_STAT_RX_VAL (1 << 3) 31e4b29009SMischa Jonker #define PS2_STAT_TX_ISNOT_FUL (1 << 4) 32e4b29009SMischa Jonker #define PS2_STAT_TX_INT_EN (1 << 5) 33e4b29009SMischa Jonker 34e4b29009SMischa Jonker struct arc_ps2_port { 35e4b29009SMischa Jonker void __iomem *data_addr; 36e4b29009SMischa Jonker void __iomem *status_addr; 37e4b29009SMischa Jonker struct serio *io; 38e4b29009SMischa Jonker }; 39e4b29009SMischa Jonker 40e4b29009SMischa Jonker struct arc_ps2_data { 41e4b29009SMischa Jonker struct arc_ps2_port port[ARC_PS2_PORTS]; 42e4b29009SMischa Jonker void __iomem *addr; 43e4b29009SMischa Jonker unsigned int frame_error; 44e4b29009SMischa Jonker unsigned int buf_overflow; 45e4b29009SMischa Jonker unsigned int total_int; 46e4b29009SMischa Jonker }; 47e4b29009SMischa Jonker 48e4b29009SMischa Jonker static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2, 49e4b29009SMischa Jonker struct arc_ps2_port *port) 50e4b29009SMischa Jonker { 51e4b29009SMischa Jonker unsigned int timeout = 1000; 52e4b29009SMischa Jonker unsigned int flag, status; 53e4b29009SMischa Jonker unsigned char data; 54e4b29009SMischa Jonker 55e4b29009SMischa Jonker do { 56e4b29009SMischa Jonker status = ioread32(port->status_addr); 57e4b29009SMischa Jonker if (!(status & PS2_STAT_RX_VAL)) 58e4b29009SMischa Jonker return; 59e4b29009SMischa Jonker 60e4b29009SMischa Jonker data = ioread32(port->data_addr) & 0xff; 61e4b29009SMischa Jonker 62e4b29009SMischa Jonker flag = 0; 63e4b29009SMischa Jonker arc_ps2->total_int++; 64e4b29009SMischa Jonker if (status & PS2_STAT_RX_FRM_ERR) { 65e4b29009SMischa Jonker arc_ps2->frame_error++; 66e4b29009SMischa Jonker flag |= SERIO_PARITY; 67e4b29009SMischa Jonker } else if (status & PS2_STAT_RX_BUF_OVER) { 68e4b29009SMischa Jonker arc_ps2->buf_overflow++; 69e4b29009SMischa Jonker flag |= SERIO_FRAME; 70e4b29009SMischa Jonker } 71e4b29009SMischa Jonker 72e4b29009SMischa Jonker serio_interrupt(port->io, data, flag); 73e4b29009SMischa Jonker } while (--timeout); 74e4b29009SMischa Jonker 75e4b29009SMischa Jonker dev_err(&port->io->dev, "PS/2 hardware stuck\n"); 76e4b29009SMischa Jonker } 77e4b29009SMischa Jonker 78e4b29009SMischa Jonker static irqreturn_t arc_ps2_interrupt(int irq, void *dev) 79e4b29009SMischa Jonker { 80e4b29009SMischa Jonker struct arc_ps2_data *arc_ps2 = dev; 81e4b29009SMischa Jonker int i; 82e4b29009SMischa Jonker 83e4b29009SMischa Jonker for (i = 0; i < ARC_PS2_PORTS; i++) 84e4b29009SMischa Jonker arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]); 85e4b29009SMischa Jonker 86e4b29009SMischa Jonker return IRQ_HANDLED; 87e4b29009SMischa Jonker } 88e4b29009SMischa Jonker 89e4b29009SMischa Jonker static int arc_ps2_write(struct serio *io, unsigned char val) 90e4b29009SMischa Jonker { 91e4b29009SMischa Jonker unsigned status; 92e4b29009SMischa Jonker struct arc_ps2_port *port = io->port_data; 93e4b29009SMischa Jonker int timeout = STAT_TIMEOUT; 94e4b29009SMischa Jonker 95e4b29009SMischa Jonker do { 96e4b29009SMischa Jonker status = ioread32(port->status_addr); 97e4b29009SMischa Jonker cpu_relax(); 98e4b29009SMischa Jonker 99e4b29009SMischa Jonker if (status & PS2_STAT_TX_ISNOT_FUL) { 100e4b29009SMischa Jonker iowrite32(val & 0xff, port->data_addr); 101e4b29009SMischa Jonker return 0; 102e4b29009SMischa Jonker } 103e4b29009SMischa Jonker 104e4b29009SMischa Jonker } while (--timeout); 105e4b29009SMischa Jonker 106e4b29009SMischa Jonker dev_err(&io->dev, "write timeout\n"); 107e4b29009SMischa Jonker return -ETIMEDOUT; 108e4b29009SMischa Jonker } 109e4b29009SMischa Jonker 110e4b29009SMischa Jonker static int arc_ps2_open(struct serio *io) 111e4b29009SMischa Jonker { 112e4b29009SMischa Jonker struct arc_ps2_port *port = io->port_data; 113e4b29009SMischa Jonker 114e4b29009SMischa Jonker iowrite32(PS2_STAT_RX_INT_EN, port->status_addr); 115e4b29009SMischa Jonker 116e4b29009SMischa Jonker return 0; 117e4b29009SMischa Jonker } 118e4b29009SMischa Jonker 119e4b29009SMischa Jonker static void arc_ps2_close(struct serio *io) 120e4b29009SMischa Jonker { 121e4b29009SMischa Jonker struct arc_ps2_port *port = io->port_data; 122e4b29009SMischa Jonker 123e4b29009SMischa Jonker iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN, 124e4b29009SMischa Jonker port->status_addr); 125e4b29009SMischa Jonker } 126e4b29009SMischa Jonker 1275298cc4cSBill Pemberton static void __iomem *arc_ps2_calc_addr(struct arc_ps2_data *arc_ps2, 128a4d6983cSDmitry Torokhov int index, bool status) 129a4d6983cSDmitry Torokhov { 130a4d6983cSDmitry Torokhov void __iomem *addr; 131a4d6983cSDmitry Torokhov 132a4d6983cSDmitry Torokhov addr = arc_ps2->addr + 4 + 4 * index; 133a4d6983cSDmitry Torokhov if (status) 134a4d6983cSDmitry Torokhov addr += ARC_PS2_PORTS * 4; 135a4d6983cSDmitry Torokhov 136a4d6983cSDmitry Torokhov return addr; 137a4d6983cSDmitry Torokhov } 138a4d6983cSDmitry Torokhov 1395298cc4cSBill Pemberton static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2) 140a4d6983cSDmitry Torokhov { 141a4d6983cSDmitry Torokhov void __iomem *addr; 142a4d6983cSDmitry Torokhov u32 val; 143a4d6983cSDmitry Torokhov int i; 144a4d6983cSDmitry Torokhov 145a4d6983cSDmitry Torokhov for (i = 0; i < ARC_PS2_PORTS; i++) { 146a4d6983cSDmitry Torokhov addr = arc_ps2_calc_addr(arc_ps2, i, true); 147a4d6983cSDmitry Torokhov val = ioread32(addr); 148a4d6983cSDmitry Torokhov val &= ~(PS2_STAT_RX_INT_EN | PS2_STAT_TX_INT_EN); 149a4d6983cSDmitry Torokhov iowrite32(val, addr); 150a4d6983cSDmitry Torokhov } 151a4d6983cSDmitry Torokhov } 152a4d6983cSDmitry Torokhov 1535298cc4cSBill Pemberton static int arc_ps2_create_port(struct platform_device *pdev, 154e4b29009SMischa Jonker struct arc_ps2_data *arc_ps2, 155e4b29009SMischa Jonker int index) 156e4b29009SMischa Jonker { 157e4b29009SMischa Jonker struct arc_ps2_port *port = &arc_ps2->port[index]; 158e4b29009SMischa Jonker struct serio *io; 159e4b29009SMischa Jonker 160e4b29009SMischa Jonker io = kzalloc(sizeof(struct serio), GFP_KERNEL); 161e4b29009SMischa Jonker if (!io) 162e4b29009SMischa Jonker return -ENOMEM; 163e4b29009SMischa Jonker 164e4b29009SMischa Jonker io->id.type = SERIO_8042; 165e4b29009SMischa Jonker io->write = arc_ps2_write; 166e4b29009SMischa Jonker io->open = arc_ps2_open; 167e4b29009SMischa Jonker io->close = arc_ps2_close; 168e4b29009SMischa Jonker snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index); 169e4b29009SMischa Jonker snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index); 170e4b29009SMischa Jonker io->port_data = port; 171e4b29009SMischa Jonker 172e4b29009SMischa Jonker port->io = io; 173e4b29009SMischa Jonker 174a4d6983cSDmitry Torokhov port->data_addr = arc_ps2_calc_addr(arc_ps2, index, false); 175a4d6983cSDmitry Torokhov port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true); 176e4b29009SMischa Jonker 177e4b29009SMischa Jonker dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n", 178e4b29009SMischa Jonker index, port->data_addr, port->status_addr); 179e4b29009SMischa Jonker 180e4b29009SMischa Jonker serio_register_port(port->io); 181e4b29009SMischa Jonker return 0; 182e4b29009SMischa Jonker } 183e4b29009SMischa Jonker 1845298cc4cSBill Pemberton static int arc_ps2_probe(struct platform_device *pdev) 185e4b29009SMischa Jonker { 186e4b29009SMischa Jonker struct arc_ps2_data *arc_ps2; 187a4d6983cSDmitry Torokhov struct resource *res; 188a4d6983cSDmitry Torokhov int irq; 189e4b29009SMischa Jonker int error, id, i; 190e4b29009SMischa Jonker 191a4d6983cSDmitry Torokhov res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 192a4d6983cSDmitry Torokhov if (!res) { 193a4d6983cSDmitry Torokhov dev_err(&pdev->dev, "no IO memory defined\n"); 194a4d6983cSDmitry Torokhov return -EINVAL; 195a4d6983cSDmitry Torokhov } 196a4d6983cSDmitry Torokhov 197a4d6983cSDmitry Torokhov irq = platform_get_irq_byname(pdev, "arc_ps2_irq"); 198a4d6983cSDmitry Torokhov if (irq < 0) { 199a4d6983cSDmitry Torokhov dev_err(&pdev->dev, "no IRQ defined\n"); 200a4d6983cSDmitry Torokhov return -EINVAL; 201a4d6983cSDmitry Torokhov } 202a4d6983cSDmitry Torokhov 203a4d6983cSDmitry Torokhov arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data), 204a4d6983cSDmitry Torokhov GFP_KERNEL); 205e4b29009SMischa Jonker if (!arc_ps2) { 206e4b29009SMischa Jonker dev_err(&pdev->dev, "out of memory\n"); 207e4b29009SMischa Jonker return -ENOMEM; 208e4b29009SMischa Jonker } 209e4b29009SMischa Jonker 2108d1cbc98SThierry Reding arc_ps2->addr = devm_ioremap_resource(&pdev->dev, res); 2118d1cbc98SThierry Reding if (IS_ERR(arc_ps2->addr)) 2128d1cbc98SThierry Reding return PTR_ERR(arc_ps2->addr); 213e4b29009SMischa Jonker 214e4b29009SMischa Jonker dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n", 215a4d6983cSDmitry Torokhov irq, arc_ps2->addr, ARC_PS2_PORTS); 216e4b29009SMischa Jonker 217e4b29009SMischa Jonker id = ioread32(arc_ps2->addr); 218e4b29009SMischa Jonker if (id != ARC_ARC_PS2_ID) { 219e4b29009SMischa Jonker dev_err(&pdev->dev, "device id does not match\n"); 220a4d6983cSDmitry Torokhov return -ENXIO; 221a4d6983cSDmitry Torokhov } 222a4d6983cSDmitry Torokhov 223a4d6983cSDmitry Torokhov arc_ps2_inhibit_ports(arc_ps2); 224a4d6983cSDmitry Torokhov 225a4d6983cSDmitry Torokhov error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt, 226a4d6983cSDmitry Torokhov 0, "arc_ps2", arc_ps2); 227a4d6983cSDmitry Torokhov if (error) { 228a4d6983cSDmitry Torokhov dev_err(&pdev->dev, "Could not allocate IRQ\n"); 229a4d6983cSDmitry Torokhov return error; 230e4b29009SMischa Jonker } 231e4b29009SMischa Jonker 232e4b29009SMischa Jonker for (i = 0; i < ARC_PS2_PORTS; i++) { 233e4b29009SMischa Jonker error = arc_ps2_create_port(pdev, arc_ps2, i); 234e4b29009SMischa Jonker if (error) { 235a4d6983cSDmitry Torokhov while (--i >= 0) 236a4d6983cSDmitry Torokhov serio_unregister_port(arc_ps2->port[i].io); 237a4d6983cSDmitry Torokhov return error; 238a4d6983cSDmitry Torokhov } 239e4b29009SMischa Jonker } 240e4b29009SMischa Jonker 241e4b29009SMischa Jonker platform_set_drvdata(pdev, arc_ps2); 242e4b29009SMischa Jonker 243e4b29009SMischa Jonker return 0; 244e4b29009SMischa Jonker } 245e4b29009SMischa Jonker 246e2619cf7SBill Pemberton static int arc_ps2_remove(struct platform_device *pdev) 247e4b29009SMischa Jonker { 248e4b29009SMischa Jonker struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev); 249e4b29009SMischa Jonker int i; 250e4b29009SMischa Jonker 251e4b29009SMischa Jonker for (i = 0; i < ARC_PS2_PORTS; i++) 252e4b29009SMischa Jonker serio_unregister_port(arc_ps2->port[i].io); 253e4b29009SMischa Jonker 254e4b29009SMischa Jonker dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int); 255e4b29009SMischa Jonker dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error); 256e4b29009SMischa Jonker dev_dbg(&pdev->dev, "buffer overflow count = %i\n", 257e4b29009SMischa Jonker arc_ps2->buf_overflow); 258e4b29009SMischa Jonker 259e4b29009SMischa Jonker return 0; 260e4b29009SMischa Jonker } 261e4b29009SMischa Jonker 262e4b29009SMischa Jonker static struct platform_driver arc_ps2_driver = { 263e4b29009SMischa Jonker .driver = { 264e4b29009SMischa Jonker .name = "arc_ps2", 265e4b29009SMischa Jonker .owner = THIS_MODULE, 266e4b29009SMischa Jonker }, 267e4b29009SMischa Jonker .probe = arc_ps2_probe, 2681cb0aa88SBill Pemberton .remove = arc_ps2_remove, 269e4b29009SMischa Jonker }; 270e4b29009SMischa Jonker 271e4b29009SMischa Jonker module_platform_driver(arc_ps2_driver); 272e4b29009SMischa Jonker 273e4b29009SMischa Jonker MODULE_LICENSE("GPL"); 274e4b29009SMischa Jonker MODULE_AUTHOR("Pavel Sokolov <psokolov@synopsys.com>"); 275e4b29009SMischa Jonker MODULE_DESCRIPTION("ARC PS/2 Driver"); 276