280 lines
6.4 KiB
C
280 lines
6.4 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Driver is originally developed by Pavel Sokolov <psokolov@synopsys.com>
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#define ARC_PS2_PORTS 2
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#define ARC_ARC_PS2_ID 0x0001f609
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#define STAT_TIMEOUT 128
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#define PS2_STAT_RX_FRM_ERR (1)
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#define PS2_STAT_RX_BUF_OVER (1 << 1)
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#define PS2_STAT_RX_INT_EN (1 << 2)
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#define PS2_STAT_RX_VAL (1 << 3)
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#define PS2_STAT_TX_ISNOT_FUL (1 << 4)
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#define PS2_STAT_TX_INT_EN (1 << 5)
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struct arc_ps2_port {
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void __iomem *data_addr;
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void __iomem *status_addr;
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struct serio *io;
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};
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struct arc_ps2_data {
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struct arc_ps2_port port[ARC_PS2_PORTS];
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void __iomem *addr;
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unsigned int frame_error;
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unsigned int buf_overflow;
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unsigned int total_int;
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};
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static void arc_ps2_check_rx(struct arc_ps2_data *arc_ps2,
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struct arc_ps2_port *port)
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{
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unsigned int timeout = 1000;
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unsigned int flag, status;
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unsigned char data;
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do {
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status = ioread32(port->status_addr);
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if (!(status & PS2_STAT_RX_VAL))
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return;
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data = ioread32(port->data_addr) & 0xff;
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flag = 0;
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arc_ps2->total_int++;
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if (status & PS2_STAT_RX_FRM_ERR) {
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arc_ps2->frame_error++;
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flag |= SERIO_PARITY;
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} else if (status & PS2_STAT_RX_BUF_OVER) {
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arc_ps2->buf_overflow++;
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flag |= SERIO_FRAME;
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}
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serio_interrupt(port->io, data, flag);
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} while (--timeout);
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dev_err(&port->io->dev, "PS/2 hardware stuck\n");
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}
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static irqreturn_t arc_ps2_interrupt(int irq, void *dev)
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{
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struct arc_ps2_data *arc_ps2 = dev;
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int i;
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for (i = 0; i < ARC_PS2_PORTS; i++)
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arc_ps2_check_rx(arc_ps2, &arc_ps2->port[i]);
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return IRQ_HANDLED;
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}
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static int arc_ps2_write(struct serio *io, unsigned char val)
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{
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unsigned status;
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struct arc_ps2_port *port = io->port_data;
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int timeout = STAT_TIMEOUT;
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do {
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status = ioread32(port->status_addr);
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cpu_relax();
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if (status & PS2_STAT_TX_ISNOT_FUL) {
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iowrite32(val & 0xff, port->data_addr);
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return 0;
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}
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} while (--timeout);
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dev_err(&io->dev, "write timeout\n");
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return -ETIMEDOUT;
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}
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static int arc_ps2_open(struct serio *io)
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{
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struct arc_ps2_port *port = io->port_data;
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iowrite32(PS2_STAT_RX_INT_EN, port->status_addr);
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return 0;
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}
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static void arc_ps2_close(struct serio *io)
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{
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struct arc_ps2_port *port = io->port_data;
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iowrite32(ioread32(port->status_addr) & ~PS2_STAT_RX_INT_EN,
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port->status_addr);
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}
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static void __iomem *arc_ps2_calc_addr(struct arc_ps2_data *arc_ps2,
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int index, bool status)
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{
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void __iomem *addr;
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addr = arc_ps2->addr + 4 + 4 * index;
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if (status)
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addr += ARC_PS2_PORTS * 4;
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return addr;
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}
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static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2)
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{
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void __iomem *addr;
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u32 val;
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int i;
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for (i = 0; i < ARC_PS2_PORTS; i++) {
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addr = arc_ps2_calc_addr(arc_ps2, i, true);
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val = ioread32(addr);
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val &= ~(PS2_STAT_RX_INT_EN | PS2_STAT_TX_INT_EN);
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iowrite32(val, addr);
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}
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}
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static int arc_ps2_create_port(struct platform_device *pdev,
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struct arc_ps2_data *arc_ps2,
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int index)
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{
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struct arc_ps2_port *port = &arc_ps2->port[index];
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struct serio *io;
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io = kzalloc(sizeof(struct serio), GFP_KERNEL);
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if (!io)
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return -ENOMEM;
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io->id.type = SERIO_8042;
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io->write = arc_ps2_write;
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io->open = arc_ps2_open;
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io->close = arc_ps2_close;
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snprintf(io->name, sizeof(io->name), "ARC PS/2 port%d", index);
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snprintf(io->phys, sizeof(io->phys), "arc/serio%d", index);
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io->port_data = port;
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port->io = io;
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port->data_addr = arc_ps2_calc_addr(arc_ps2, index, false);
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port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true);
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dev_dbg(&pdev->dev, "port%d is allocated (data = 0x%p, status = 0x%p)\n",
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index, port->data_addr, port->status_addr);
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serio_register_port(port->io);
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return 0;
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}
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static int arc_ps2_probe(struct platform_device *pdev)
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{
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struct arc_ps2_data *arc_ps2;
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struct resource *res;
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int irq;
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int error, id, i;
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irq = platform_get_irq_byname(pdev, "arc_ps2_irq");
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if (irq < 0) {
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dev_err(&pdev->dev, "no IRQ defined\n");
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return -EINVAL;
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}
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arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data),
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GFP_KERNEL);
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if (!arc_ps2) {
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dev_err(&pdev->dev, "out of memory\n");
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return -ENOMEM;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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arc_ps2->addr = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(arc_ps2->addr))
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return PTR_ERR(arc_ps2->addr);
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dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n",
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irq, arc_ps2->addr, ARC_PS2_PORTS);
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id = ioread32(arc_ps2->addr);
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if (id != ARC_ARC_PS2_ID) {
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dev_err(&pdev->dev, "device id does not match\n");
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return -ENXIO;
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}
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arc_ps2_inhibit_ports(arc_ps2);
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error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt,
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0, "arc_ps2", arc_ps2);
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if (error) {
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dev_err(&pdev->dev, "Could not allocate IRQ\n");
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return error;
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}
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for (i = 0; i < ARC_PS2_PORTS; i++) {
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error = arc_ps2_create_port(pdev, arc_ps2, i);
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if (error) {
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while (--i >= 0)
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serio_unregister_port(arc_ps2->port[i].io);
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return error;
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}
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}
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platform_set_drvdata(pdev, arc_ps2);
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return 0;
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}
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static int arc_ps2_remove(struct platform_device *pdev)
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{
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struct arc_ps2_data *arc_ps2 = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < ARC_PS2_PORTS; i++)
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serio_unregister_port(arc_ps2->port[i].io);
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dev_dbg(&pdev->dev, "interrupt count = %i\n", arc_ps2->total_int);
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dev_dbg(&pdev->dev, "frame error count = %i\n", arc_ps2->frame_error);
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dev_dbg(&pdev->dev, "buffer overflow count = %i\n",
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arc_ps2->buf_overflow);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id arc_ps2_match[] = {
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{ .compatible = "snps,arc_ps2" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, arc_ps2_match);
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#endif
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static struct platform_driver arc_ps2_driver = {
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.driver = {
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.name = "arc_ps2",
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.of_match_table = of_match_ptr(arc_ps2_match),
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},
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.probe = arc_ps2_probe,
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.remove = arc_ps2_remove,
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};
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module_platform_driver(arc_ps2_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pavel Sokolov <psokolov@synopsys.com>");
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MODULE_DESCRIPTION("ARC PS/2 Driver");
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