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210 lines
4.2 KiB
210 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* linux/drivers/input/serio/ambakmi.c |
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* |
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* Copyright (C) 2000-2003 Deep Blue Solutions Ltd. |
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* Copyright (C) 2002 Russell King. |
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*/ |
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#include <linux/module.h> |
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#include <linux/serio.h> |
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#include <linux/errno.h> |
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#include <linux/interrupt.h> |
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#include <linux/ioport.h> |
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#include <linux/device.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/err.h> |
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#include <linux/amba/bus.h> |
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#include <linux/amba/kmi.h> |
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#include <linux/clk.h> |
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#include <asm/io.h> |
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#include <asm/irq.h> |
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#define KMI_BASE (kmi->base) |
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struct amba_kmi_port { |
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struct serio *io; |
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struct clk *clk; |
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void __iomem *base; |
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unsigned int irq; |
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unsigned int divisor; |
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unsigned int open; |
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}; |
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static irqreturn_t amba_kmi_int(int irq, void *dev_id) |
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{ |
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struct amba_kmi_port *kmi = dev_id; |
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unsigned int status = readb(KMIIR); |
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int handled = IRQ_NONE; |
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while (status & KMIIR_RXINTR) { |
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serio_interrupt(kmi->io, readb(KMIDATA), 0); |
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status = readb(KMIIR); |
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handled = IRQ_HANDLED; |
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} |
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return handled; |
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} |
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static int amba_kmi_write(struct serio *io, unsigned char val) |
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{ |
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struct amba_kmi_port *kmi = io->port_data; |
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unsigned int timeleft = 10000; /* timeout in 100ms */ |
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while ((readb(KMISTAT) & KMISTAT_TXEMPTY) == 0 && --timeleft) |
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udelay(10); |
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if (timeleft) |
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writeb(val, KMIDATA); |
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return timeleft ? 0 : SERIO_TIMEOUT; |
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} |
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static int amba_kmi_open(struct serio *io) |
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{ |
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struct amba_kmi_port *kmi = io->port_data; |
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unsigned int divisor; |
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int ret; |
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ret = clk_prepare_enable(kmi->clk); |
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if (ret) |
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goto out; |
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divisor = clk_get_rate(kmi->clk) / 8000000 - 1; |
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writeb(divisor, KMICLKDIV); |
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writeb(KMICR_EN, KMICR); |
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ret = request_irq(kmi->irq, amba_kmi_int, IRQF_SHARED, "kmi-pl050", |
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kmi); |
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if (ret) { |
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printk(KERN_ERR "kmi: failed to claim IRQ%d\n", kmi->irq); |
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writeb(0, KMICR); |
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goto clk_disable; |
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} |
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writeb(KMICR_EN | KMICR_RXINTREN, KMICR); |
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return 0; |
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clk_disable: |
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clk_disable_unprepare(kmi->clk); |
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out: |
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return ret; |
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} |
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static void amba_kmi_close(struct serio *io) |
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{ |
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struct amba_kmi_port *kmi = io->port_data; |
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writeb(0, KMICR); |
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free_irq(kmi->irq, kmi); |
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clk_disable_unprepare(kmi->clk); |
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} |
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static int amba_kmi_probe(struct amba_device *dev, |
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const struct amba_id *id) |
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{ |
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struct amba_kmi_port *kmi; |
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struct serio *io; |
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int ret; |
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ret = amba_request_regions(dev, NULL); |
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if (ret) |
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return ret; |
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kmi = kzalloc(sizeof(struct amba_kmi_port), GFP_KERNEL); |
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io = kzalloc(sizeof(struct serio), GFP_KERNEL); |
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if (!kmi || !io) { |
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ret = -ENOMEM; |
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goto out; |
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} |
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io->id.type = SERIO_8042; |
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io->write = amba_kmi_write; |
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io->open = amba_kmi_open; |
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io->close = amba_kmi_close; |
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strlcpy(io->name, dev_name(&dev->dev), sizeof(io->name)); |
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strlcpy(io->phys, dev_name(&dev->dev), sizeof(io->phys)); |
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io->port_data = kmi; |
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io->dev.parent = &dev->dev; |
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kmi->io = io; |
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kmi->base = ioremap(dev->res.start, resource_size(&dev->res)); |
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if (!kmi->base) { |
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ret = -ENOMEM; |
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goto out; |
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} |
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kmi->clk = clk_get(&dev->dev, "KMIREFCLK"); |
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if (IS_ERR(kmi->clk)) { |
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ret = PTR_ERR(kmi->clk); |
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goto unmap; |
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} |
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kmi->irq = dev->irq[0]; |
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amba_set_drvdata(dev, kmi); |
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serio_register_port(kmi->io); |
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return 0; |
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unmap: |
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iounmap(kmi->base); |
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out: |
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kfree(kmi); |
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kfree(io); |
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amba_release_regions(dev); |
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return ret; |
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} |
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static void amba_kmi_remove(struct amba_device *dev) |
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{ |
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struct amba_kmi_port *kmi = amba_get_drvdata(dev); |
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serio_unregister_port(kmi->io); |
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clk_put(kmi->clk); |
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iounmap(kmi->base); |
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kfree(kmi); |
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amba_release_regions(dev); |
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} |
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static int __maybe_unused amba_kmi_resume(struct device *dev) |
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{ |
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struct amba_kmi_port *kmi = dev_get_drvdata(dev); |
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/* kick the serio layer to rescan this port */ |
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serio_reconnect(kmi->io); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(amba_kmi_dev_pm_ops, NULL, amba_kmi_resume); |
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static const struct amba_id amba_kmi_idtable[] = { |
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{ |
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.id = 0x00041050, |
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.mask = 0x000fffff, |
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}, |
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{ 0, 0 } |
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}; |
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MODULE_DEVICE_TABLE(amba, amba_kmi_idtable); |
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static struct amba_driver ambakmi_driver = { |
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.drv = { |
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.name = "kmi-pl050", |
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.owner = THIS_MODULE, |
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.pm = &amba_kmi_dev_pm_ops, |
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}, |
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.id_table = amba_kmi_idtable, |
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.probe = amba_kmi_probe, |
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.remove = amba_kmi_remove, |
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}; |
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module_amba_driver(ambakmi_driver); |
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MODULE_AUTHOR("Russell King <[email protected]>"); |
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MODULE_DESCRIPTION("AMBA KMI controller driver"); |
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MODULE_LICENSE("GPL");
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