// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * Driver is originally developed by Pavel Sokolov */ #include #include #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]; 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 void __iomem *arc_ps2_calc_addr(struct arc_ps2_data *arc_ps2, int index, bool status) { void __iomem *addr; addr = arc_ps2->addr + 4 + 4 * index; if (status) addr += ARC_PS2_PORTS * 4; return addr; } static void arc_ps2_inhibit_ports(struct arc_ps2_data *arc_ps2) { void __iomem *addr; u32 val; int i; for (i = 0; i < ARC_PS2_PORTS; i++) { addr = arc_ps2_calc_addr(arc_ps2, i, true); val = ioread32(addr); val &= ~(PS2_STAT_RX_INT_EN | PS2_STAT_TX_INT_EN); iowrite32(val, addr); } } static int 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_calc_addr(arc_ps2, index, false); port->status_addr = arc_ps2_calc_addr(arc_ps2, index, true); 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 arc_ps2_probe(struct platform_device *pdev) { struct arc_ps2_data *arc_ps2; struct resource *res; int irq; int error, id, i; irq = platform_get_irq_byname(pdev, "arc_ps2_irq"); if (irq < 0) { dev_err(&pdev->dev, "no IRQ defined\n"); return -EINVAL; } arc_ps2 = devm_kzalloc(&pdev->dev, sizeof(struct arc_ps2_data), GFP_KERNEL); if (!arc_ps2) { dev_err(&pdev->dev, "out of memory\n"); return -ENOMEM; } res = platform_get_resource(pdev, IORESOURCE_MEM, 0); arc_ps2->addr = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(arc_ps2->addr)) return PTR_ERR(arc_ps2->addr); dev_info(&pdev->dev, "irq = %d, address = 0x%p, ports = %i\n", 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"); return -ENXIO; } arc_ps2_inhibit_ports(arc_ps2); error = devm_request_irq(&pdev->dev, irq, arc_ps2_interrupt, 0, "arc_ps2", arc_ps2); if (error) { dev_err(&pdev->dev, "Could not allocate IRQ\n"); return error; } for (i = 0; i < ARC_PS2_PORTS; i++) { error = arc_ps2_create_port(pdev, arc_ps2, i); if (error) { while (--i >= 0) serio_unregister_port(arc_ps2->port[i].io); return error; } } platform_set_drvdata(pdev, arc_ps2); return 0; } static int 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); 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); return 0; } #ifdef CONFIG_OF static const struct of_device_id arc_ps2_match[] = { { .compatible = "snps,arc_ps2" }, { }, }; MODULE_DEVICE_TABLE(of, arc_ps2_match); #endif static struct platform_driver arc_ps2_driver = { .driver = { .name = "arc_ps2", .of_match_table = of_match_ptr(arc_ps2_match), }, .probe = arc_ps2_probe, .remove = arc_ps2_remove, }; module_platform_driver(arc_ps2_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Pavel Sokolov "); MODULE_DESCRIPTION("ARC PS/2 Driver");