From e4b290094603423623d3f268e054f40f3f51afa8 Mon Sep 17 00:00:00 2001 From: Mischa Jonker Date: Mon, 22 Oct 2012 22:48:08 -0700 Subject: Input: serio - add ARC PS/2 driver This adds support for the PS/2 block that is used in various ARC FPGA platforms. Signed-off-by: Mischa Jonker Signed-off-by: Dmitry Torokhov --- drivers/input/serio/arc_ps2.c | 279 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 279 insertions(+) create mode 100644 drivers/input/serio/arc_ps2.c (limited to 'drivers/input/serio/arc_ps2.c') diff --git a/drivers/input/serio/arc_ps2.c b/drivers/input/serio/arc_ps2.c new file mode 100644 index 000000000000..f8c026ac15e1 --- /dev/null +++ b/drivers/input/serio/arc_ps2.c @@ -0,0 +1,279 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Driver is originally developed by Pavel Sokolov + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define ARC_PS2_PORTS 2 + +#define ARC_ARC_PS2_ID 0x0001f609 + +#define STAT_TIMEOUT 128 + +#define PS2_STAT_RX_FRM_ERR (1) +#define PS2_STAT_RX_BUF_OVER (1 << 1) +#define PS2_STAT_RX_INT_EN (1 << 2) +#define PS2_STAT_RX_VAL (1 << 3) +#define PS2_STAT_TX_ISNOT_FUL (1 << 4) +#define PS2_STAT_TX_INT_EN (1 << 5) + +struct arc_ps2_port { + void __iomem *data_addr; + void __iomem *status_addr; + struct serio *io; +}; + +struct arc_ps2_data { + struct arc_ps2_port port[ARC_PS2_PORTS]; + struct resource *iomem_res; + int irq; + void __iomem *addr; + unsigned int frame_error; + unsigned int buf_overflow; + unsigned int total_int; +}; + +static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2, + struct arc_ps2_port *port) +{ + unsigned int timeout = 1000; + unsigned int flag, status; + unsigned char data; + + do { + status = ioread32(port->status_addr); + if (!(status & PS2_STAT_RX_VAL)) + return; + + data = ioread32(port->data_addr) & 0xff; + + flag = 0; + arc_ps2->total_int++; + if (status & PS2_STAT_RX_FRM_ERR) { + arc_ps2->frame_error++; + flag |= SERIO_PARITY; + } else if (status & PS2_STAT_RX_BUF_OVER) { + arc_ps2->buf_overflow++; + flag |= SERIO_FRAME; + } + + serio_interrupt(port->io, data, flag); + } while (--timeout); + + dev_err(&port->io->dev, "PS/2 hardware stuck\n"); +} + +static irqreturn_t arc_ps2_interrupt(int irq, void *dev) +{ + struct arc_ps2_data *arc_ps2 = dev; + int i; + + for (i = 0; i < ARC_PS2_PORTS; i++) + arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]); + + return IRQ_HANDLED; +} + +static int arc_ps2_write(struct serio *io, unsigned char val) +{ + unsigned status; + struct arc_ps2_port *port = io->port_data; + int timeout = STAT_TIMEOUT; + + do { + status = ioread32(port->status_addr); + cpu_relax(); + + if (status & PS2_STAT_TX_ISNOT_FUL) { + iowrite32(val & 0xff, port->data_addr); + return 0; + } + + } while (--timeout); + + dev_err(&io->dev, "write timeout\n"); + return -ETIMEDOUT; +} + +static int arc_ps2_open(struct serio *io) +{ + struct arc_ps2_port *port = io->port_data; + + iowrite32(PS2_STAT_RX_INT_EN, port->status_addr); + + return 0; +} + +static void arc_ps2_close(struct serio *io) +{ + struct arc_ps2_port *port = io->port_data; + + iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN, + port->status_addr); +} + +static int __devinit arc_ps2_create_port(struct platform_device *pdev, + struct arc_ps2_data *arc_ps2, + int index) +{ + struct arc_ps2_port *port = &arc_ps2->port[index]; + struct serio *io; + + io = kzalloc(sizeof(struct serio), GFP_KERNEL); + if (!io) + return -ENOMEM; + + io->id.type = SERIO_8042; + io->write = arc_ps2_write; + io->open = arc_ps2_open; + io->close = arc_ps2_close; + snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index); + snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index); + io->port_data = port; + + port->io = io; + + port->data_addr = arc_ps2->addr + 4 + index * 4; + port->status_addr = arc_ps2->addr + 4 + ARC_PS2_PORTS * 4 + index * 4; + + dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n", + index, port->data_addr, port->status_addr); + + serio_register_port(port->io); + return 0; +} + +static int __devinit arc_ps2_probe(struct platform_device *pdev) +{ + struct arc_ps2_data *arc_ps2; + int error, id, i; + + arc_ps2 = kzalloc(sizeof(struct arc_ps2_data), GFP_KERNEL); + if (!arc_ps2) { + dev_err(&pdev->dev, "out of memory\n"); + return -ENOMEM; + } + + arc_ps2->iomem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!arc_ps2->iomem_res) { + dev_err(&pdev->dev, "no IO memory defined\n"); + error = -EINVAL; + goto err_free_mem; + } + + arc_ps2->irq = platform_get_irq_byname(pdev, "arc_ps2_irq"); + if (arc_ps2->irq < 0) { + dev_err(&pdev->dev, "no IRQ defined\n"); + error = -EINVAL; + goto err_free_mem; + } + + if (!request_mem_region(arc_ps2->iomem_res->start, + resource_size(arc_ps2->iomem_res), pdev->name)) { + dev_err(&pdev->dev, "memory region allocation failed for %pR\n", + arc_ps2->iomem_res); + + error = -EBUSY; + goto err_free_mem; + } + + arc_ps2->addr = ioremap_nocache(arc_ps2->iomem_res->start, + resource_size(arc_ps2->iomem_res)); + if (!arc_ps2->addr) { + dev_err(&pdev->dev, "memory mapping failed\n"); + error = -ENOMEM; + goto err_release_region; + } + + dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n", + arc_ps2->irq, arc_ps2->addr, ARC_PS2_PORTS); + + id = ioread32(arc_ps2->addr); + if (id != ARC_ARC_PS2_ID) { + dev_err(&pdev->dev, "device id does not match\n"); + error = -ENXIO; + goto err_unmap; + } + + for (i = 0; i < ARC_PS2_PORTS; i++) { + error = arc_ps2_create_port(pdev, arc_ps2, i); + if (error) + goto err_unregister_ports; + } + + error = request_irq(arc_ps2->irq, arc_ps2_interrupt, 0, + "arc_ps2", arc_ps2); + if (error) { + dev_err(&pdev->dev, "Could not allocate IRQ\n"); + goto err_unregister_ports; + } + + platform_set_drvdata(pdev, arc_ps2); + + return 0; + +err_unregister_ports: + for (i = 0; i < ARC_PS2_PORTS; i++) { + if (arc_ps2->port[i].io) + serio_unregister_port(arc_ps2->port[i].io); + } +err_unmap: + iounmap(arc_ps2->addr); +err_release_region: + release_mem_region(arc_ps2->iomem_res->start, + resource_size(arc_ps2->iomem_res)); +err_free_mem: + kfree(arc_ps2); + return error; +} + +static int __devexit arc_ps2_remove(struct platform_device *pdev) +{ + struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < ARC_PS2_PORTS; i++) + serio_unregister_port(arc_ps2->port[i].io); + + free_irq(arc_ps2->irq, arc_ps2); + iounmap(arc_ps2->addr); + release_mem_region(arc_ps2->iomem_res->start, + resource_size(arc_ps2->iomem_res)); + + dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int); + dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error); + dev_dbg(&pdev->dev, "buffer overflow count = %i\n", + arc_ps2->buf_overflow); + + kfree(arc_ps2); + + return 0; +} + +static struct platform_driver arc_ps2_driver = { + .driver = { + .name = "arc_ps2", + .owner = THIS_MODULE, + }, + .probe = arc_ps2_probe, + .remove = __devexit_p(arc_ps2_remove), +}; + +module_platform_driver(arc_ps2_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Pavel Sokolov "); +MODULE_DESCRIPTION("ARC PS/2 Driver"); -- cgit v1.2.2