Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756535Ab2JQKKl (ORCPT ); Wed, 17 Oct 2012 06:10:41 -0400 Received: from us02smtp1.synopsys.com ([198.182.60.75]:58589 "EHLO vaxjo.synopsys.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755862Ab2JQKKi (ORCPT ); Wed, 17 Oct 2012 06:10:38 -0400 From: Mischa Jonker To: dmitry.torokhov@gmail.com, m.d.s.x.jonker@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, arc-linux-dev@synopsys.com Cc: Mischa Jonker Subject: [PATCH] Input: serio - Add ARC PS/2 driver Date: Wed, 17 Oct 2012 12:10:19 +0200 Message-Id: <1350468619-4813-2-git-send-email-mischa.jonker@synopsys.com> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1350468619-4813-1-git-send-email-mischa.jonker@synopsys.com> References: <1350468619-4813-1-git-send-email-mischa.jonker@synopsys.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8724 Lines: 327 This adds support for the PS/2 block that is used in various ARC FPGA platforms. Signed-off-by: Mischa Jonker --- drivers/input/serio/Kconfig | 9 ++ drivers/input/serio/Makefile | 1 + drivers/input/serio/arc_ps2.c | 275 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 285 insertions(+), 0 deletions(-) create mode 100644 drivers/input/serio/arc_ps2.c diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig index 55f2c22..4a4e182 100644 --- a/drivers/input/serio/Kconfig +++ b/drivers/input/serio/Kconfig @@ -234,4 +234,13 @@ config SERIO_PS2MULT To compile this driver as a module, choose M here: the module will be called ps2mult. +config SERIO_ARC_PS2 + tristate "ARC PS/2 support" + help + Say Y here if you have an ARC FPGA platform with a PS/2 + controller in it. + + To compile this driver as a module, choose M here; the module + will be called arc_ps2. + endif diff --git a/drivers/input/serio/Makefile b/drivers/input/serio/Makefile index dbbe376..4b0c8f8 100644 --- a/drivers/input/serio/Makefile +++ b/drivers/input/serio/Makefile @@ -25,3 +25,4 @@ obj-$(CONFIG_SERIO_RAW) += serio_raw.o obj-$(CONFIG_SERIO_AMS_DELTA) += ams_delta_serio.o obj-$(CONFIG_SERIO_XILINX_XPS_PS2) += xilinx_ps2.o obj-$(CONFIG_SERIO_ALTERA_PS2) += altera_ps2.o +obj-$(CONFIG_SERIO_ARC_PS2) += arc_ps2.o diff --git a/drivers/input/serio/arc_ps2.c b/drivers/input/serio/arc_ps2.c new file mode 100644 index 0000000..c952685 --- /dev/null +++ b/drivers/input/serio/arc_ps2.c @@ -0,0 +1,275 @@ +/* + * 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 *data, *status; + struct serio *io; +}; + +struct arc_ps2_data { + struct arc_ps2_port port[ARC_PS2_PORTS]; + struct resource *iomem_res; + int irq; + void *addr; + unsigned frame_error; + unsigned buf_overflow; + unsigned total_int; +}; + +static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2, + struct arc_ps2_port *port) +{ + unsigned flag, status; + unsigned char data; + + while (1) { + status = ioread32(port->status); + if (!(status & PS2_STAT_RX_VAL)) + break; + 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; + } + data = ioread32(port->data) & 0xff; + + serio_interrupt(port->io, data, flag); + } +} + +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); + cpu_relax(); + timeout--; + } while (!(status & PS2_STAT_TX_ISNOT_FUL) && timeout); + + if (timeout) + iowrite32(val & 0xff, port->data); + else { + dev_err(&io->dev, "write timeout\n"); + return -ETIMEDOUT; + } + + return 0; +} + +static int arc_ps2_open(struct serio *io) +{ + struct arc_ps2_port *port = io->port_data; + iowrite32(PS2_STAT_RX_INT_EN, port->status); + return 0; +} + +static void arc_ps2_close(struct serio *io) +{ + struct arc_ps2_port *port = io->port_data; + + iowrite32(ioread32(port->status) & ~PS2_STAT_RX_INT_EN, port->status); +} + +static int __devinit arc_ps2_allocate_port(struct platform_device *pdev, + struct arc_ps2_port *port, + int index, void *base) +{ + 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 = base + 4 + index * 4; + port->status = base + 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, port->status); + + return 0; +} + +static int __devinit arc_ps2_probe(struct platform_device *pdev) +{ + struct arc_ps2_data *arc_ps2; + int ret, id, i; + + arc_ps2 = kzalloc(sizeof(struct arc_ps2_data), GFP_KERNEL); + if (!arc_ps2) { + dev_err(&pdev->dev, "out of memory\n"); + ret = -ENOMEM; + goto out; + } + + 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"); + ret = -ENODEV; + goto out_free; + } + + arc_ps2->irq = platform_get_irq_byname(pdev, "arc_ps2_irq"); + if (arc_ps2->irq < 0) { + dev_err(&pdev->dev, "no IRQ defined\n"); + ret = -ENODEV; + goto out_free; + } + + if (!request_mem_region(arc_ps2->iomem_res->start, + resource_size(arc_ps2->iomem_res), pdev->name)) { + dev_err(&pdev->dev, "memory allocation failed cannot get the I/O addr 0x%x\n", + (unsigned int)arc_ps2->iomem_res->start); + + ret = -EBUSY; + goto out_free; + } + + 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"); + ret = -ENOMEM; + goto out_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"); + ret = ENXIO; + goto out_unmap; + } + + platform_set_drvdata(pdev, arc_ps2); + + for (i = 0; i < ARC_PS2_PORTS; i++) { + ret = arc_ps2_allocate_port(pdev, &arc_ps2->port[i], i, + arc_ps2->addr); + if (ret) + goto release; + serio_register_port(arc_ps2->port[i].io); + } + + ret = request_irq(arc_ps2->irq, arc_ps2_interrupt, 0, + "arc_ps2", arc_ps2); + if (ret) { + dev_err(&pdev->dev, "Could not allocate IRQ\n"); + goto release; + } + + return 0; + +release: + for (i = 0; i < ARC_PS2_PORTS; i++) { + if (arc_ps2->port[i].io) + serio_unregister_port(arc_ps2->port[i].io); + } +out_unmap: + iounmap((void __iomem *) arc_ps2->addr); +out_release_region: + release_mem_region(arc_ps2->iomem_res->start, + resource_size(arc_ps2->iomem_res)); +out_free: + kfree(arc_ps2); +out: + return ret; +} + +static int __devexit arc_ps2_remove(struct platform_device *pdev) +{ + struct arc_ps2_data *arc_ps2; + int i; + + arc_ps2 = platform_get_drvdata(pdev); + for (i = 0; i < ARC_PS2_PORTS; i++) + serio_unregister_port(arc_ps2->port[i].io); + + free_irq(arc_ps2->irq, arc_ps2); + iounmap((void __iomem *) 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"); -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/