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119 lines
3.3 KiB
Diff
119 lines
3.3 KiB
Diff
From 0c072b46ecc8689be160bfdc750e95ad9879d706 Mon Sep 17 00:00:00 2001
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From: Akhil Goyal <akhil.goyal@nxp.com>
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Date: Thu, 5 Jul 2018 20:14:21 +0530
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Subject: [PATCH] staging: fsl_ppfe: enable hif event from userspace
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HIF interrupts are enabled using ioctl from user space,
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and epoll wait from user space wakes up when there is an HIF
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interrupt.
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Signed-off-by: Akhil Goyal <akhil.goyal@nxp.com>
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---
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drivers/staging/fsl_ppfe/pfe_cdev.c | 57 +++++++++++++++++++++++++++++++++++++
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drivers/staging/fsl_ppfe/pfe_cdev.h | 5 ++--
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2 files changed, 60 insertions(+), 2 deletions(-)
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--- a/drivers/staging/fsl_ppfe/pfe_cdev.c
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+++ b/drivers/staging/fsl_ppfe/pfe_cdev.c
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@@ -20,11 +20,18 @@
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* - used for interacting with the kernel layer for link status
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*/
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+#include <linux/eventfd.h>
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+#include <linux/irqreturn.h>
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+#include <linux/io.h>
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+#include <asm/irq.h>
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+
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#include "pfe_cdev.h"
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+#include "pfe_mod.h"
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static int pfe_majno;
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static struct class *pfe_char_class;
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static struct device *pfe_char_dev;
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+struct eventfd_ctx *g_trigger;
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struct pfe_shared_info link_states[PFE_CDEV_ETH_COUNT];
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@@ -80,10 +87,44 @@ static ssize_t pfe_cdev_write(struct fil
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static int pfe_cdev_release(struct inode *inp, struct file *fp)
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{
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+ if (g_trigger) {
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+ free_irq(pfe->hif_irq, g_trigger);
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+ eventfd_ctx_put(g_trigger);
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+ g_trigger = NULL;
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+ }
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+
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pr_info("PFE_CDEV: Device successfully closed\n");
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return 0;
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}
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+/*
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+ * hif_us_isr-
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+ * This ISR routine processes Rx/Tx done interrupts from the HIF hardware block
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+ */
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+static irqreturn_t hif_us_isr(int irq, void *arg)
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+{
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+ struct eventfd_ctx *trigger = (struct eventfd_ctx *)arg;
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+ int int_status;
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+ int int_enable_mask;
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+
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+ /*Read hif interrupt source register */
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+ int_status = readl_relaxed(HIF_INT_SRC);
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+ int_enable_mask = readl_relaxed(HIF_INT_ENABLE);
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+
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+ if ((int_status & HIF_INT) == 0)
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+ return IRQ_NONE;
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+
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+ if (int_status & HIF_RXPKT_INT) {
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+ int_enable_mask &= ~(HIF_RXPKT_INT);
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+ eventfd_signal(trigger, 1);
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+ }
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+
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+ /*Disable interrupts, they will be enabled after they are serviced */
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+ writel_relaxed(int_enable_mask, HIF_INT_ENABLE);
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+
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+ return IRQ_HANDLED;
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+}
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+
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static long pfe_cdev_ioctl(struct file *fp, unsigned int cmd,
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unsigned long arg)
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{
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@@ -105,6 +146,22 @@ static long pfe_cdev_ioctl(struct file *
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pr_debug("Returning state=%d for ETH1\n", *argp);
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ret = 0;
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break;
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+ case PFE_CDEV_HIF_INTR_EN:
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+ /* Return success/failure */
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+ g_trigger = eventfd_ctx_fdget(*argp);
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+ if (IS_ERR(g_trigger))
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+ return PTR_ERR(g_trigger);
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+ ret = request_irq(pfe->hif_irq, hif_us_isr, 0, "pfe_hif",
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+ g_trigger);
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+ if (ret) {
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+ pr_err("%s: failed to get the hif IRQ = %d\n",
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+ __func__, pfe->hif_irq);
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+ eventfd_ctx_put(g_trigger);
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+ g_trigger = NULL;
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+ }
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+ pr_debug("request_irq for hif interrupt: %d\n", pfe->hif_irq);
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+ ret = 0;
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+ break;
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default:
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pr_info("Unsupport cmd (%d) for PFE CDEV.\n", cmd);
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break;
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--- a/drivers/staging/fsl_ppfe/pfe_cdev.h
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+++ b/drivers/staging/fsl_ppfe/pfe_cdev.h
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@@ -43,8 +43,9 @@ struct pfe_shared_info {
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extern struct pfe_shared_info link_states[PFE_CDEV_ETH_COUNT];
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/* IOCTL Commands */
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-#define PFE_CDEV_ETH0_STATE_GET 0
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-#define PFE_CDEV_ETH1_STATE_GET 1
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+#define PFE_CDEV_ETH0_STATE_GET _IOR('R', 0, int)
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+#define PFE_CDEV_ETH1_STATE_GET _IOR('R', 1, int)
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+#define PFE_CDEV_HIF_INTR_EN _IOWR('R', 2, int)
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int pfe_cdev_init(void);
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void pfe_cdev_exit(void);
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