diff options
Diffstat (limited to 'drivers/input/serio/at32psif.c')
| -rw-r--r-- | drivers/input/serio/at32psif.c | 357 |
1 files changed, 0 insertions, 357 deletions
diff --git a/drivers/input/serio/at32psif.c b/drivers/input/serio/at32psif.c deleted file mode 100644 index e420fd781d44..000000000000 --- a/drivers/input/serio/at32psif.c +++ /dev/null @@ -1,357 +0,0 @@ -/* - * Copyright (C) 2007 Atmel Corporation - * - * Driver for the AT32AP700X PS/2 controller (PSIF). - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published - * by the Free Software Foundation. - */ -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/device.h> -#include <linux/init.h> -#include <linux/serio.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/io.h> -#include <linux/clk.h> -#include <linux/platform_device.h> -#include <linux/slab.h> - -/* PSIF register offsets */ -#define PSIF_CR 0x00 -#define PSIF_RHR 0x04 -#define PSIF_THR 0x08 -#define PSIF_SR 0x10 -#define PSIF_IER 0x14 -#define PSIF_IDR 0x18 -#define PSIF_IMR 0x1c -#define PSIF_PSR 0x24 - -/* Bitfields in control register. */ -#define PSIF_CR_RXDIS_OFFSET 1 -#define PSIF_CR_RXDIS_SIZE 1 -#define PSIF_CR_RXEN_OFFSET 0 -#define PSIF_CR_RXEN_SIZE 1 -#define PSIF_CR_SWRST_OFFSET 15 -#define PSIF_CR_SWRST_SIZE 1 -#define PSIF_CR_TXDIS_OFFSET 9 -#define PSIF_CR_TXDIS_SIZE 1 -#define PSIF_CR_TXEN_OFFSET 8 -#define PSIF_CR_TXEN_SIZE 1 - -/* Bitfields in interrupt disable, enable, mask and status register. */ -#define PSIF_NACK_OFFSET 8 -#define PSIF_NACK_SIZE 1 -#define PSIF_OVRUN_OFFSET 5 -#define PSIF_OVRUN_SIZE 1 -#define PSIF_PARITY_OFFSET 9 -#define PSIF_PARITY_SIZE 1 -#define PSIF_RXRDY_OFFSET 4 -#define PSIF_RXRDY_SIZE 1 -#define PSIF_TXEMPTY_OFFSET 1 -#define PSIF_TXEMPTY_SIZE 1 -#define PSIF_TXRDY_OFFSET 0 -#define PSIF_TXRDY_SIZE 1 - -/* Bitfields in prescale register. */ -#define PSIF_PSR_PRSCV_OFFSET 0 -#define PSIF_PSR_PRSCV_SIZE 12 - -/* Bitfields in receive hold register. */ -#define PSIF_RHR_RXDATA_OFFSET 0 -#define PSIF_RHR_RXDATA_SIZE 8 - -/* Bitfields in transmit hold register. */ -#define PSIF_THR_TXDATA_OFFSET 0 -#define PSIF_THR_TXDATA_SIZE 8 - -/* Bit manipulation macros */ -#define PSIF_BIT(name) \ - (1 << PSIF_##name##_OFFSET) - -#define PSIF_BF(name, value) \ - (((value) & ((1 << PSIF_##name##_SIZE) - 1)) \ - << PSIF_##name##_OFFSET) - -#define PSIF_BFEXT(name, value) \ - (((value) >> PSIF_##name##_OFFSET) \ - & ((1 << PSIF_##name##_SIZE) - 1)) - -#define PSIF_BFINS(name, value, old) \ - (((old) & ~(((1 << PSIF_##name##_SIZE) - 1) \ - << PSIF_##name##_OFFSET)) \ - | PSIF_BF(name, value)) - -/* Register access macros */ -#define psif_readl(port, reg) \ - __raw_readl((port)->regs + PSIF_##reg) - -#define psif_writel(port, reg, value) \ - __raw_writel((value), (port)->regs + PSIF_##reg) - -struct psif { - struct platform_device *pdev; - struct clk *pclk; - struct serio *io; - void __iomem *regs; - unsigned int irq; - /* Prevent concurrent writes to PSIF THR. */ - spinlock_t lock; - bool open; -}; - -static irqreturn_t psif_interrupt(int irq, void *_ptr) -{ - struct psif *psif = _ptr; - int retval = IRQ_NONE; - unsigned int io_flags = 0; - unsigned long status; - - status = psif_readl(psif, SR); - - if (status & PSIF_BIT(RXRDY)) { - unsigned char val = (unsigned char) psif_readl(psif, RHR); - - if (status & PSIF_BIT(PARITY)) - io_flags |= SERIO_PARITY; - if (status & PSIF_BIT(OVRUN)) - dev_err(&psif->pdev->dev, "overrun read error\n"); - - serio_interrupt(psif->io, val, io_flags); - - retval = IRQ_HANDLED; - } - - return retval; -} - -static int psif_write(struct serio *io, unsigned char val) -{ - struct psif *psif = io->port_data; - unsigned long flags; - int timeout = 10; - int retval = 0; - - spin_lock_irqsave(&psif->lock, flags); - - while (!(psif_readl(psif, SR) & PSIF_BIT(TXEMPTY)) && timeout--) - udelay(50); - - if (timeout >= 0) { - psif_writel(psif, THR, val); - } else { - dev_dbg(&psif->pdev->dev, "timeout writing to THR\n"); - retval = -EBUSY; - } - - spin_unlock_irqrestore(&psif->lock, flags); - - return retval; -} - -static int psif_open(struct serio *io) -{ - struct psif *psif = io->port_data; - int retval; - - retval = clk_enable(psif->pclk); - if (retval) - return retval; - - psif_writel(psif, CR, PSIF_BIT(CR_TXEN) | PSIF_BIT(CR_RXEN)); - psif_writel(psif, IER, PSIF_BIT(RXRDY)); - - psif->open = true; - return retval; -} - -static void psif_close(struct serio *io) -{ - struct psif *psif = io->port_data; - - psif->open = false; - - psif_writel(psif, IDR, ~0UL); - psif_writel(psif, CR, PSIF_BIT(CR_TXDIS) | PSIF_BIT(CR_RXDIS)); - - clk_disable(psif->pclk); -} - -static void psif_set_prescaler(struct psif *psif) -{ - unsigned long prscv; - unsigned long rate = clk_get_rate(psif->pclk); - - /* PRSCV = Pulse length (100 us) * PSIF module frequency. */ - prscv = 100 * (rate / 1000000UL); - - if (prscv > ((1<<PSIF_PSR_PRSCV_SIZE) - 1)) { - prscv = (1<<PSIF_PSR_PRSCV_SIZE) - 1; - dev_dbg(&psif->pdev->dev, "pclk too fast, " - "prescaler set to max\n"); - } - - clk_enable(psif->pclk); - psif_writel(psif, PSR, prscv); - clk_disable(psif->pclk); -} - -static int __init psif_probe(struct platform_device *pdev) -{ - struct resource *regs; - struct psif *psif; - struct serio *io; - struct clk *pclk; - int irq; - int ret; - - psif = kzalloc(sizeof(struct psif), GFP_KERNEL); - if (!psif) - return -ENOMEM; - psif->pdev = pdev; - - io = kzalloc(sizeof(struct serio), GFP_KERNEL); - if (!io) { - ret = -ENOMEM; - goto out_free_psif; - } - psif->io = io; - - regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!regs) { - dev_dbg(&pdev->dev, "no mmio resources defined\n"); - ret = -ENOMEM; - goto out_free_io; - } - - psif->regs = ioremap(regs->start, resource_size(regs)); - if (!psif->regs) { - ret = -ENOMEM; - dev_dbg(&pdev->dev, "could not map I/O memory\n"); - goto out_free_io; - } - - pclk = clk_get(&pdev->dev, "pclk"); - if (IS_ERR(pclk)) { - dev_dbg(&pdev->dev, "could not get peripheral clock\n"); - ret = PTR_ERR(pclk); - goto out_iounmap; - } - psif->pclk = pclk; - - /* Reset the PSIF to enter at a known state. */ - ret = clk_enable(pclk); - if (ret) { - dev_dbg(&pdev->dev, "could not enable pclk\n"); - goto out_put_clk; - } - psif_writel(psif, CR, PSIF_BIT(CR_SWRST)); - clk_disable(pclk); - - irq = platform_get_irq(pdev, 0); - if (irq < 0) { - dev_dbg(&pdev->dev, "could not get irq\n"); - ret = -ENXIO; - goto out_put_clk; - } - ret = request_irq(irq, psif_interrupt, IRQF_SHARED, "at32psif", psif); - if (ret) { - dev_dbg(&pdev->dev, "could not request irq %d\n", irq); - goto out_put_clk; - } - psif->irq = irq; - - io->id.type = SERIO_8042; - io->write = psif_write; - io->open = psif_open; - io->close = psif_close; - snprintf(io->name, sizeof(io->name), "AVR32 PS/2 port%d", pdev->id); - snprintf(io->phys, sizeof(io->phys), "at32psif/serio%d", pdev->id); - io->port_data = psif; - io->dev.parent = &pdev->dev; - - psif_set_prescaler(psif); - - spin_lock_init(&psif->lock); - serio_register_port(psif->io); - platform_set_drvdata(pdev, psif); - - dev_info(&pdev->dev, "Atmel AVR32 PSIF PS/2 driver on 0x%08x irq %d\n", - (int)psif->regs, psif->irq); - - return 0; - -out_put_clk: - clk_put(psif->pclk); -out_iounmap: - iounmap(psif->regs); -out_free_io: - kfree(io); -out_free_psif: - kfree(psif); - return ret; -} - -static int __exit psif_remove(struct platform_device *pdev) -{ - struct psif *psif = platform_get_drvdata(pdev); - - psif_writel(psif, IDR, ~0UL); - psif_writel(psif, CR, PSIF_BIT(CR_TXDIS) | PSIF_BIT(CR_RXDIS)); - - serio_unregister_port(psif->io); - iounmap(psif->regs); - free_irq(psif->irq, psif); - clk_put(psif->pclk); - kfree(psif); - - return 0; -} - -#ifdef CONFIG_PM_SLEEP -static int psif_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct psif *psif = platform_get_drvdata(pdev); - - if (psif->open) { - psif_writel(psif, CR, PSIF_BIT(CR_RXDIS) | PSIF_BIT(CR_TXDIS)); - clk_disable(psif->pclk); - } - - return 0; -} - -static int psif_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct psif *psif = platform_get_drvdata(pdev); - - if (psif->open) { - clk_enable(psif->pclk); - psif_set_prescaler(psif); - psif_writel(psif, CR, PSIF_BIT(CR_RXEN) | PSIF_BIT(CR_TXEN)); - } - - return 0; -} -#endif - -static SIMPLE_DEV_PM_OPS(psif_pm_ops, psif_suspend, psif_resume); - -static struct platform_driver psif_driver = { - .remove = __exit_p(psif_remove), - .driver = { - .name = "atmel_psif", - .pm = &psif_pm_ops, - }, -}; - -module_platform_driver_probe(psif_driver, psif_probe); - -MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>"); -MODULE_DESCRIPTION("Atmel AVR32 PSIF PS/2 driver"); -MODULE_LICENSE("GPL"); |