^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * drivers/uio/uio_pdrv_genirq.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Userspace I/O platform driver with generic IRQ handling code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2008 Magnus Damm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Based on uio_pdrv.c by Uwe Kleine-Koenig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright (C) 2008 by Digi International Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/uio_driver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/stringify.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/pm_runtime.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/of_address.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define DRIVER_NAME "uio_pdrv_genirq"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct uio_pdrv_genirq_platdata {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct uio_info *uioinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct platform_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /* Bits in uio_pdrv_genirq_platdata.flags */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) UIO_IRQ_DISABLED = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static int uio_pdrv_genirq_open(struct uio_info *info, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct uio_pdrv_genirq_platdata *priv = info->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /* Wait until the Runtime PM code has woken up the device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) pm_runtime_get_sync(&priv->pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) static int uio_pdrv_genirq_release(struct uio_info *info, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct uio_pdrv_genirq_platdata *priv = info->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /* Tell the Runtime PM code that the device has become idle */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) pm_runtime_put_sync(&priv->pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static irqreturn_t uio_pdrv_genirq_handler(int irq, struct uio_info *dev_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct uio_pdrv_genirq_platdata *priv = dev_info->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /* Just disable the interrupt in the interrupt controller, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * remember the state so we can allow user space to enable it later.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) spin_lock(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (!__test_and_set_bit(UIO_IRQ_DISABLED, &priv->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) disable_irq_nosync(irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) spin_unlock(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static int uio_pdrv_genirq_irqcontrol(struct uio_info *dev_info, s32 irq_on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct uio_pdrv_genirq_platdata *priv = dev_info->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /* Allow user space to enable and disable the interrupt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * in the interrupt controller, but keep track of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * state to prevent per-irq depth damage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * Serialize this operation to support multiple tasks and concurrency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * with irq handler on SMP systems.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) spin_lock_irqsave(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (irq_on) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) if (__test_and_clear_bit(UIO_IRQ_DISABLED, &priv->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) enable_irq(dev_info->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (!__test_and_set_bit(UIO_IRQ_DISABLED, &priv->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) disable_irq_nosync(dev_info->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) spin_unlock_irqrestore(&priv->lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static void uio_pdrv_genirq_cleanup(void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) struct device *dev = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) pm_runtime_disable(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int uio_pdrv_genirq_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct uio_info *uioinfo = dev_get_platdata(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct device_node *node = pdev->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct uio_pdrv_genirq_platdata *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct uio_mem *uiomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) int ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) /* alloc uioinfo for one device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) uioinfo = devm_kzalloc(&pdev->dev, sizeof(*uioinfo),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (!uioinfo) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) dev_err(&pdev->dev, "unable to kmalloc\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) if (!of_property_read_string(node, "linux,uio-name", &name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) uioinfo->name = devm_kstrdup(&pdev->dev, name, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) uioinfo->name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) "%pOFn", node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) uioinfo->version = "devicetree";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* Multiple IRQs are not supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (!uioinfo || !uioinfo->name || !uioinfo->version) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) dev_err(&pdev->dev, "missing platform_data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (uioinfo->handler || uioinfo->irqcontrol ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) uioinfo->irq_flags & IRQF_SHARED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) dev_err(&pdev->dev, "interrupt configuration error\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) if (!priv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) dev_err(&pdev->dev, "unable to kmalloc\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) priv->uioinfo = uioinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) spin_lock_init(&priv->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) priv->flags = 0; /* interrupt is enabled to begin with */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) priv->pdev = pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (!uioinfo->irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) ret = platform_get_irq_optional(pdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) uioinfo->irq = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) if (ret == -ENXIO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) uioinfo->irq = UIO_IRQ_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) else if (ret == -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) else if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) dev_err(&pdev->dev, "failed to get IRQ\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) if (uioinfo->irq) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct irq_data *irq_data = irq_get_irq_data(uioinfo->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * If a level interrupt, dont do lazy disable. Otherwise the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * irq will fire again since clearing of the actual cause, on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * device level, is done in userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * irqd_is_level_type() isn't used since isn't valid until
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * irq is configured.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (irq_data &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) irqd_get_trigger_type(irq_data) & IRQ_TYPE_LEVEL_MASK) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) dev_dbg(&pdev->dev, "disable lazy unmask\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) irq_set_status_flags(uioinfo->irq, IRQ_DISABLE_UNLAZY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) uiomem = &uioinfo->mem[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) for (i = 0; i < pdev->num_resources; ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct resource *r = &pdev->resource[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) if (r->flags != IORESOURCE_MEM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (uiomem >= &uioinfo->mem[MAX_UIO_MAPS]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) dev_warn(&pdev->dev, "device has more than "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) __stringify(MAX_UIO_MAPS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) " I/O memory resources.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) uiomem->memtype = UIO_MEM_PHYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) uiomem->addr = r->start & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) uiomem->offs = r->start & ~PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) uiomem->size = (uiomem->offs + resource_size(r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) + PAGE_SIZE - 1) & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) uiomem->name = r->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) ++uiomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) while (uiomem < &uioinfo->mem[MAX_UIO_MAPS]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) uiomem->size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) ++uiomem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) /* This driver requires no hardware specific kernel code to handle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * interrupts. Instead, the interrupt handler simply disables the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) * interrupt in the interrupt controller. User space is responsible
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * for performing hardware specific acknowledge and re-enabling of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * the interrupt in the interrupt controller.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * Interrupt sharing is not supported.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) uioinfo->handler = uio_pdrv_genirq_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) uioinfo->irqcontrol = uio_pdrv_genirq_irqcontrol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) uioinfo->open = uio_pdrv_genirq_open;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) uioinfo->release = uio_pdrv_genirq_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) uioinfo->priv = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /* Enable Runtime PM for this device:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * The device starts in suspended state to allow the hardware to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * turned off by default. The Runtime PM bus code should power on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) * hardware and enable clocks at open().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) pm_runtime_enable(&pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) ret = devm_add_action_or_reset(&pdev->dev, uio_pdrv_genirq_cleanup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) &pdev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) ret = devm_uio_register_device(&pdev->dev, priv->uioinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) dev_err(&pdev->dev, "unable to register uio device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) static int uio_pdrv_genirq_runtime_nop(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /* Runtime PM callback shared between ->runtime_suspend()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * and ->runtime_resume(). Simply returns success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * In this driver pm_runtime_get_sync() and pm_runtime_put_sync()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * are used at open() and release() time. This allows the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * Runtime PM code to turn off power to the device while the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * device is unused, ie before open() and after release().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * This Runtime PM callback does not need to save or restore
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) * any registers since user space is responsbile for hardware
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) * register reinitialization after open().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) static const struct dev_pm_ops uio_pdrv_genirq_dev_pm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) .runtime_suspend = uio_pdrv_genirq_runtime_nop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) .runtime_resume = uio_pdrv_genirq_runtime_nop,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static struct of_device_id uio_of_genirq_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) { /* This is filled with module_parm */ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) { /* Sentinel */ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) MODULE_DEVICE_TABLE(of, uio_of_genirq_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) module_param_string(of_id, uio_of_genirq_match[0].compatible, 128, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) MODULE_PARM_DESC(of_id, "Openfirmware id of the device to be handled by uio");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static struct platform_driver uio_pdrv_genirq = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) .probe = uio_pdrv_genirq_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) .name = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) .pm = &uio_pdrv_genirq_dev_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) .of_match_table = of_match_ptr(uio_of_genirq_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) module_platform_driver(uio_pdrv_genirq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) MODULE_AUTHOR("Magnus Damm");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) MODULE_DESCRIPTION("Userspace I/O platform driver with generic IRQ handling");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) MODULE_ALIAS("platform:" DRIVER_NAME);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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