Something went wrong. Try again.
(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
Something went wrong. Try again.
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright (C) 2013 Aeroflex Gaisler * * This driver supports the APBPS2 PS/2 core available in the GRLIB * VHDL IP core library. * * Full documentation of the APBPS2 core can be found here: * http://www.gaisler.com/products/grlib/grip.pdf * * See "Documentation/devicetree/bindings/input/ps2keyb-mouse-apbps2.txt" for * information on open firmware properties. * * Contributors: Daniel Hellstrom <daniel@gaisler.com> */#include <linux/platform_device.h>#include <linux/module.h>#include <linux/serio.h>#include <linux/errno.h>#include <linux/interrupt.h>#include <linux/of.h>#include <linux/of_irq.h>#include <linux/device.h>#include <linux/delay.h>#include <linux/err.h>#include <linux/slab.h>#include <linux/string.h>#include <linux/kernel.h>#include <linux/io.h>
struct apbps2_regs { u32 __iomem data; /* 0x00 */ u32 __iomem status; /* 0x04 */ u32 __iomem ctrl; /* 0x08 */ u32 __iomem reload; /* 0x0c */};
#define APBPS2_STATUS_DR (1<<0)#define APBPS2_STATUS_PE (1<<1)#define APBPS2_STATUS_FE (1<<2)#define APBPS2_STATUS_KI (1<<3)#define APBPS2_STATUS_RF (1<<4)#define APBPS2_STATUS_TF (1<<5)#define APBPS2_STATUS_TCNT (0x1f<<22)#define APBPS2_STATUS_RCNT (0x1f<<27)
#define APBPS2_CTRL_RE (1<<0)#define APBPS2_CTRL_TE (1<<1)#define APBPS2_CTRL_RI (1<<2)#define APBPS2_CTRL_TI (1<<3)
struct apbps2_priv { struct serio *io; struct apbps2_regs __iomem *regs;};
static int apbps2_idx;
static irqreturn_t apbps2_isr(int irq, void *dev_id){ struct apbps2_priv *priv = dev_id; unsigned long status, data, rxflags; irqreturn_t ret = IRQ_NONE;
while ((status = ioread32be(&priv->regs->status)) & APBPS2_STATUS_DR) { data = ioread32be(&priv->regs->data); rxflags = (status & APBPS2_STATUS_PE) ? SERIO_PARITY : 0; rxflags |= (status & APBPS2_STATUS_FE) ? SERIO_FRAME : 0;
/* Clear error bits */ if (rxflags) iowrite32be(0, &priv->regs->status);
serio_interrupt(priv->io, data, rxflags);
ret = IRQ_HANDLED; }
return ret;}
static int apbps2_write(struct serio *io, unsigned char val){ struct apbps2_priv *priv = io->port_data; unsigned int tleft = 10000; /* Timeout in 100ms */
/* Delay until PS/2 controller has room for more chars */ while ((ioread32be(&priv->regs->status) & APBPS2_STATUS_TF) && tleft--) udelay(10);
if ((ioread32be(&priv->regs->status) & APBPS2_STATUS_TF) == 0) { iowrite32be(val, &priv->regs->data);
iowrite32be(APBPS2_CTRL_RE | APBPS2_CTRL_RI | APBPS2_CTRL_TE, &priv->regs->ctrl); return 0; }
return -ETIMEDOUT;}
static int apbps2_open(struct serio *io){ struct apbps2_priv *priv = io->port_data; int limit;
/* Clear error flags */ iowrite32be(0, &priv->regs->status);
/* Clear old data if available (unlikely) */ limit = 1024; while ((ioread32be(&priv->regs->status) & APBPS2_STATUS_DR) && --limit) ioread32be(&priv->regs->data);
/* Enable receiver and its interrupt */ iowrite32be(APBPS2_CTRL_RE | APBPS2_CTRL_RI, &priv->regs->ctrl);
return 0;}
static void apbps2_close(struct serio *io){ struct apbps2_priv *priv = io->port_data;
/* Stop interrupts at PS/2 HW level */ iowrite32be(0, &priv->regs->ctrl);}
/* Initialize one APBPS2 PS/2 core */static int apbps2_of_probe(struct platform_device *ofdev){ struct apbps2_priv *priv; int irq, err; u32 freq_hz;
priv = devm_kzalloc(&ofdev->dev, sizeof(*priv), GFP_KERNEL); if (!priv) { dev_err(&ofdev->dev, "memory allocation failed\n"); return -ENOMEM; }
/* Find device address */ priv->regs = devm_platform_ioremap_resource(ofdev, 0); if (IS_ERR(priv->regs)) return PTR_ERR(priv->regs);
/* Reset hardware, disable interrupt */ iowrite32be(0, &priv->regs->ctrl);
/* IRQ */ irq = platform_get_irq(ofdev, 0); if (irq < 0) return irq;
err = devm_request_irq(&ofdev->dev, irq, apbps2_isr, IRQF_SHARED, "apbps2", priv); if (err) { dev_err(&ofdev->dev, "request IRQ%d failed\n", irq); return err; }
/* Get core frequency */ if (of_property_read_u32(ofdev->dev.of_node, "freq", &freq_hz)) { dev_err(&ofdev->dev, "unable to get core frequency\n"); return -EINVAL; }
/* Set reload register to core freq in kHz/10 */ iowrite32be(freq_hz / 10000, &priv->regs->reload);
priv->io = kzalloc_obj(*priv->io); if (!priv->io) return -ENOMEM;
priv->io->id.type = SERIO_8042; priv->io->open = apbps2_open; priv->io->close = apbps2_close; priv->io->write = apbps2_write; priv->io->port_data = priv; strscpy(priv->io->name, "APBPS2 PS/2", sizeof(priv->io->name)); snprintf(priv->io->phys, sizeof(priv->io->phys), "apbps2_%d", apbps2_idx++);
dev_info(&ofdev->dev, "irq = %d, base = 0x%p\n", irq, priv->regs);
serio_register_port(priv->io);
platform_set_drvdata(ofdev, priv);
return 0;}
static void apbps2_of_remove(struct platform_device *of_dev){ struct apbps2_priv *priv = platform_get_drvdata(of_dev);
serio_unregister_port(priv->io);}
static const struct of_device_id apbps2_of_match[] = { { .name = "GAISLER_APBPS2", }, { .name = "01_060", }, {}};
MODULE_DEVICE_TABLE(of, apbps2_of_match);
static struct platform_driver apbps2_of_driver = { .driver = { .name = "grlib-apbps2", .of_match_table = apbps2_of_match, }, .probe = apbps2_of_probe, .remove = apbps2_of_remove,};
module_platform_driver(apbps2_of_driver);
MODULE_AUTHOR("Aeroflex Gaisler AB.");MODULE_DESCRIPTION("GRLIB APBPS2 PS/2 serial I/O");MODULE_LICENSE("GPL");