linux/drivers/input/serio/ioc3kbd.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * SGI IOC3 PS/2 controller driver for linux
   4 *
   5 * Copyright (C) 2019 Thomas Bogendoerfer <tbogendoerfer@suse.de>
   6 *
   7 * Based on code Copyright (C) 2005 Stanislaw Skowronek <skylark@unaligned.org>
   8 *               Copyright (C) 2009 Johannes Dickgreber <tanzy@gmx.de>
   9 */
  10
  11#include <linux/delay.h>
  12#include <linux/init.h>
  13#include <linux/io.h>
  14#include <linux/serio.h>
  15#include <linux/module.h>
  16#include <linux/platform_device.h>
  17
  18#include <asm/sn/ioc3.h>
  19
  20struct ioc3kbd_data {
  21        struct ioc3_serioregs __iomem *regs;
  22        struct serio *kbd, *aux;
  23        bool kbd_exists, aux_exists;
  24        int irq;
  25};
  26
  27static int ioc3kbd_wait(struct ioc3_serioregs __iomem *regs, u32 mask)
  28{
  29        unsigned long timeout = 0;
  30
  31        while ((readl(&regs->km_csr) & mask) && (timeout < 250)) {
  32                udelay(50);
  33                timeout++;
  34        }
  35        return (timeout >= 250) ? -ETIMEDOUT : 0;
  36}
  37
  38static int ioc3kbd_write(struct serio *dev, u8 val)
  39{
  40        struct ioc3kbd_data *d = dev->port_data;
  41        int ret;
  42
  43        ret = ioc3kbd_wait(d->regs, KM_CSR_K_WRT_PEND);
  44        if (ret)
  45                return ret;
  46
  47        writel(val, &d->regs->k_wd);
  48
  49        return 0;
  50}
  51
  52static int ioc3kbd_start(struct serio *dev)
  53{
  54        struct ioc3kbd_data *d = dev->port_data;
  55
  56        d->kbd_exists = true;
  57        return 0;
  58}
  59
  60static void ioc3kbd_stop(struct serio *dev)
  61{
  62        struct ioc3kbd_data *d = dev->port_data;
  63
  64        d->kbd_exists = false;
  65}
  66
  67static int ioc3aux_write(struct serio *dev, u8 val)
  68{
  69        struct ioc3kbd_data *d = dev->port_data;
  70        int ret;
  71
  72        ret = ioc3kbd_wait(d->regs, KM_CSR_M_WRT_PEND);
  73        if (ret)
  74                return ret;
  75
  76        writel(val, &d->regs->m_wd);
  77
  78        return 0;
  79}
  80
  81static int ioc3aux_start(struct serio *dev)
  82{
  83        struct ioc3kbd_data *d = dev->port_data;
  84
  85        d->aux_exists = true;
  86        return 0;
  87}
  88
  89static void ioc3aux_stop(struct serio *dev)
  90{
  91        struct ioc3kbd_data *d = dev->port_data;
  92
  93        d->aux_exists = false;
  94}
  95
  96static void ioc3kbd_process_data(struct serio *dev, u32 data)
  97{
  98        if (data & KM_RD_VALID_0)
  99                serio_interrupt(dev, (data >> KM_RD_DATA_0_SHIFT) & 0xff, 0);
 100        if (data & KM_RD_VALID_1)
 101                serio_interrupt(dev, (data >> KM_RD_DATA_1_SHIFT) & 0xff, 0);
 102        if (data & KM_RD_VALID_2)
 103                serio_interrupt(dev, (data >> KM_RD_DATA_2_SHIFT) & 0xff, 0);
 104}
 105
 106static irqreturn_t ioc3kbd_intr(int itq, void *dev_id)
 107{
 108        struct ioc3kbd_data *d = dev_id;
 109        u32 data_k, data_m;
 110
 111        data_k = readl(&d->regs->k_rd);
 112        if (d->kbd_exists)
 113                ioc3kbd_process_data(d->kbd, data_k);
 114
 115        data_m = readl(&d->regs->m_rd);
 116        if (d->aux_exists)
 117                ioc3kbd_process_data(d->aux, data_m);
 118
 119        return IRQ_HANDLED;
 120}
 121
 122static int ioc3kbd_probe(struct platform_device *pdev)
 123{
 124        struct ioc3_serioregs __iomem *regs;
 125        struct device *dev = &pdev->dev;
 126        struct ioc3kbd_data *d;
 127        struct serio *sk, *sa;
 128        int irq, ret;
 129
 130        regs = devm_platform_ioremap_resource(pdev, 0);
 131        if (IS_ERR(regs))
 132                return PTR_ERR(regs);
 133
 134        irq = platform_get_irq(pdev, 0);
 135        if (irq < 0)
 136                return -ENXIO;
 137
 138        d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
 139        if (!d)
 140                return -ENOMEM;
 141
 142        sk = kzalloc(sizeof(*sk), GFP_KERNEL);
 143        if (!sk)
 144                return -ENOMEM;
 145
 146        sa = kzalloc(sizeof(*sa), GFP_KERNEL);
 147        if (!sa) {
 148                kfree(sk);
 149                return -ENOMEM;
 150        }
 151
 152        sk->id.type = SERIO_8042;
 153        sk->write = ioc3kbd_write;
 154        sk->start = ioc3kbd_start;
 155        sk->stop = ioc3kbd_stop;
 156        snprintf(sk->name, sizeof(sk->name), "IOC3 keyboard %d", pdev->id);
 157        snprintf(sk->phys, sizeof(sk->phys), "ioc3/serio%dkbd", pdev->id);
 158        sk->port_data = d;
 159        sk->dev.parent = dev;
 160
 161        sa->id.type = SERIO_8042;
 162        sa->write = ioc3aux_write;
 163        sa->start = ioc3aux_start;
 164        sa->stop = ioc3aux_stop;
 165        snprintf(sa->name, sizeof(sa->name), "IOC3 auxiliary %d", pdev->id);
 166        snprintf(sa->phys, sizeof(sa->phys), "ioc3/serio%daux", pdev->id);
 167        sa->port_data = d;
 168        sa->dev.parent = dev;
 169
 170        d->regs = regs;
 171        d->kbd = sk;
 172        d->aux = sa;
 173        d->irq = irq;
 174
 175        platform_set_drvdata(pdev, d);
 176        serio_register_port(d->kbd);
 177        serio_register_port(d->aux);
 178
 179        ret = request_irq(irq, ioc3kbd_intr, IRQF_SHARED, "ioc3-kbd", d);
 180        if (ret) {
 181                dev_err(dev, "could not request IRQ %d\n", irq);
 182                serio_unregister_port(d->kbd);
 183                serio_unregister_port(d->aux);
 184                return ret;
 185        }
 186
 187        /* enable ports */
 188        writel(KM_CSR_K_CLAMP_3 | KM_CSR_M_CLAMP_3, &regs->km_csr);
 189
 190        return 0;
 191}
 192
 193static int ioc3kbd_remove(struct platform_device *pdev)
 194{
 195        struct ioc3kbd_data *d = platform_get_drvdata(pdev);
 196
 197        free_irq(d->irq, d);
 198
 199        serio_unregister_port(d->kbd);
 200        serio_unregister_port(d->aux);
 201
 202        return 0;
 203}
 204
 205static struct platform_driver ioc3kbd_driver = {
 206        .probe          = ioc3kbd_probe,
 207        .remove         = ioc3kbd_remove,
 208        .driver = {
 209                .name = "ioc3-kbd",
 210        },
 211};
 212module_platform_driver(ioc3kbd_driver);
 213
 214MODULE_AUTHOR("Thomas Bogendoerfer <tbogendoerfer@suse.de>");
 215MODULE_DESCRIPTION("SGI IOC3 serio driver");
 216MODULE_LICENSE("GPL");
 217