^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/drivers/input/serio/ambakmi.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2000-2003 Deep Blue Solutions Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 2002 Russell King.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/serio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/ioport.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/amba/bus.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/amba/kmi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/clk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define KMI_BASE (kmi->base)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct amba_kmi_port {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct serio *io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct clk *clk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) void __iomem *base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) unsigned int irq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) unsigned int divisor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) unsigned int open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) static irqreturn_t amba_kmi_int(int irq, void *dev_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct amba_kmi_port *kmi = dev_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) unsigned int status = readb(KMIIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int handled = IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) while (status & KMIIR_RXINTR) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) serio_interrupt(kmi->io, readb(KMIDATA), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) status = readb(KMIIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) handled = IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) return handled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) static int amba_kmi_write(struct serio *io, unsigned char val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct amba_kmi_port *kmi = io->port_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) unsigned int timeleft = 10000; /* timeout in 100ms */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) while ((readb(KMISTAT) & KMISTAT_TXEMPTY) == 0 && --timeleft)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) udelay(10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (timeleft)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) writeb(val, KMIDATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return timeleft ? 0 : SERIO_TIMEOUT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static int amba_kmi_open(struct serio *io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct amba_kmi_port *kmi = io->port_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) unsigned int divisor;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) ret = clk_prepare_enable(kmi->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) divisor = clk_get_rate(kmi->clk) / 8000000 - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) writeb(divisor, KMICLKDIV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) writeb(KMICR_EN, KMICR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) ret = request_irq(kmi->irq, amba_kmi_int, IRQF_SHARED, "kmi-pl050",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) kmi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) printk(KERN_ERR "kmi: failed to claim IRQ%d\n", kmi->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) writeb(0, KMICR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) goto clk_disable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) writeb(KMICR_EN | KMICR_RXINTREN, KMICR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) clk_disable:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) clk_disable_unprepare(kmi->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static void amba_kmi_close(struct serio *io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct amba_kmi_port *kmi = io->port_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) writeb(0, KMICR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) free_irq(kmi->irq, kmi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) clk_disable_unprepare(kmi->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static int amba_kmi_probe(struct amba_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) const struct amba_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct amba_kmi_port *kmi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct serio *io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) ret = amba_request_regions(dev, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) kmi = kzalloc(sizeof(struct amba_kmi_port), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) io = kzalloc(sizeof(struct serio), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (!kmi || !io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) io->id.type = SERIO_8042;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) io->write = amba_kmi_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) io->open = amba_kmi_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) io->close = amba_kmi_close;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) strlcpy(io->name, dev_name(&dev->dev), sizeof(io->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) strlcpy(io->phys, dev_name(&dev->dev), sizeof(io->phys));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) io->port_data = kmi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) io->dev.parent = &dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) kmi->io = io;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) kmi->base = ioremap(dev->res.start, resource_size(&dev->res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (!kmi->base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) kmi->clk = clk_get(&dev->dev, "KMIREFCLK");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (IS_ERR(kmi->clk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) ret = PTR_ERR(kmi->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) goto unmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) kmi->irq = dev->irq[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) amba_set_drvdata(dev, kmi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) serio_register_port(kmi->io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) unmap:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) iounmap(kmi->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) kfree(kmi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) kfree(io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) amba_release_regions(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static void amba_kmi_remove(struct amba_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct amba_kmi_port *kmi = amba_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) serio_unregister_port(kmi->io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) clk_put(kmi->clk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) iounmap(kmi->base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) kfree(kmi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) amba_release_regions(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static int __maybe_unused amba_kmi_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) struct amba_kmi_port *kmi = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /* kick the serio layer to rescan this port */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) serio_reconnect(kmi->io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static SIMPLE_DEV_PM_OPS(amba_kmi_dev_pm_ops, NULL, amba_kmi_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) static const struct amba_id amba_kmi_idtable[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) .id = 0x00041050,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) .mask = 0x000fffff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) { 0, 0 }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) MODULE_DEVICE_TABLE(amba, amba_kmi_idtable);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static struct amba_driver ambakmi_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) .drv = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) .name = "kmi-pl050",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) .pm = &amba_kmi_dev_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) .id_table = amba_kmi_idtable,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) .probe = amba_kmi_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) .remove = amba_kmi_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) module_amba_driver(ambakmi_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) MODULE_DESCRIPTION("AMBA KMI controller driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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