target/linux/layerscape/patches-5.4/701-net-0309-staging-fsl_ppfe-enable-hif-event-from-userspace.patch

   1 From 0c072b46ecc8689be160bfdc750e95ad9879d706 Mon Sep 17 00:00:00 2001
   2 From: Akhil Goyal <akhil.goyal@nxp.com>
   3 Date: Thu, 5 Jul 2018 20:14:21 +0530
   4 Subject: [PATCH] staging: fsl_ppfe: enable hif event from userspace
   5
   6 HIF interrupts are enabled using ioctl from user space,
   7 and epoll wait from user space wakes up when there is an HIF
   8 interrupt.
   9
  10 Signed-off-by: Akhil Goyal <akhil.goyal@nxp.com>
  11 ---
  12  drivers/staging/fsl_ppfe/pfe_cdev.c | 57 +++++++++++++++++++++++++++++++++++++
  13  drivers/staging/fsl_ppfe/pfe_cdev.h |  5 ++--
  14  2 files changed, 60 insertions(+), 2 deletions(-)
  15
  16 --- a/drivers/staging/fsl_ppfe/pfe_cdev.c
  17 +++ b/drivers/staging/fsl_ppfe/pfe_cdev.c
  18 @@ -20,11 +20,18 @@
  19   *  - used for interacting with the kernel layer for link status
  20   */
  21
  22 +#include <linux/eventfd.h>
  23 +#include <linux/irqreturn.h>
  24 +#include <linux/io.h>
  25 +#include <asm/irq.h>
  26 +
  27  #include "pfe_cdev.h"
  28 +#include "pfe_mod.h"
  29
  30  static int pfe_majno;
  31  static struct class *pfe_char_class;
  32  static struct device *pfe_char_dev;
  33 +struct eventfd_ctx *g_trigger;
  34
  35  struct pfe_shared_info link_states[PFE_CDEV_ETH_COUNT];
  36
  37 @@ -80,10 +87,44 @@ static ssize_t pfe_cdev_write(struct fil
  38
  39  static int pfe_cdev_release(struct inode *inp, struct file *fp)
  40  {
  41 +       if (g_trigger) {
  42 +               free_irq(pfe->hif_irq, g_trigger);
  43 +               eventfd_ctx_put(g_trigger);
  44 +               g_trigger = NULL;
  45 +       }
  46 +
  47         pr_info("PFE_CDEV: Device successfully closed\n");
  48         return 0;
  49  }
  50
  51 +/*
  52 + * hif_us_isr-
  53 + * This ISR routine processes Rx/Tx done interrupts from the HIF hardware block
  54 + */
  55 +static irqreturn_t hif_us_isr(int irq, void *arg)
  56 +{
  57 +       struct eventfd_ctx *trigger = (struct eventfd_ctx *)arg;
  58 +       int int_status;
  59 +       int int_enable_mask;
  60 +
  61 +       /*Read hif interrupt source register */
  62 +       int_status = readl_relaxed(HIF_INT_SRC);
  63 +       int_enable_mask = readl_relaxed(HIF_INT_ENABLE);
  64 +
  65 +       if ((int_status & HIF_INT) == 0)
  66 +               return IRQ_NONE;
  67 +
  68 +       if (int_status & HIF_RXPKT_INT) {
  69 +               int_enable_mask &= ~(HIF_RXPKT_INT);
  70 +               eventfd_signal(trigger, 1);
  71 +       }
  72 +
  73 +       /*Disable interrupts, they will be enabled after they are serviced */
  74 +       writel_relaxed(int_enable_mask, HIF_INT_ENABLE);
  75 +
  76 +       return IRQ_HANDLED;
  77 +}
  78 +
  79  static long pfe_cdev_ioctl(struct file *fp, unsigned int cmd,
  80                            unsigned long arg)
  81  {
  82 @@ -105,6 +146,22 @@ static long pfe_cdev_ioctl(struct file *
  83                 pr_debug("Returning state=%d for ETH1\n", *argp);
  84                 ret = 0;
  85                 break;
  86 +       case PFE_CDEV_HIF_INTR_EN:
  87 +               /* Return success/failure */
  88 +               g_trigger = eventfd_ctx_fdget(*argp);
  89 +               if (IS_ERR(g_trigger))
  90 +                       return PTR_ERR(g_trigger);
  91 +               ret = request_irq(pfe->hif_irq, hif_us_isr, 0, "pfe_hif",
  92 +                                 g_trigger);
  93 +               if (ret) {
  94 +                       pr_err("%s: failed to get the hif IRQ = %d\n",
  95 +                              __func__, pfe->hif_irq);
  96 +                       eventfd_ctx_put(g_trigger);
  97 +                       g_trigger = NULL;
  98 +               }
  99 +               pr_debug("request_irq for hif interrupt: %d\n", pfe->hif_irq);
 100 +               ret = 0;
 101 +               break;
 102         default:
 103                 pr_info("Unsupport cmd (%d) for PFE CDEV.\n", cmd);
 104                 break;
 105 --- a/drivers/staging/fsl_ppfe/pfe_cdev.h
 106 +++ b/drivers/staging/fsl_ppfe/pfe_cdev.h
 107 @@ -43,8 +43,9 @@ struct pfe_shared_info {
 108  extern struct pfe_shared_info link_states[PFE_CDEV_ETH_COUNT];
 109
 110  /* IOCTL Commands */
 111 -#define PFE_CDEV_ETH0_STATE_GET        0
 112 -#define PFE_CDEV_ETH1_STATE_GET        1
 113 +#define PFE_CDEV_ETH0_STATE_GET                _IOR('R', 0, int)
 114 +#define PFE_CDEV_ETH1_STATE_GET                _IOR('R', 1, int)
 115 +#define PFE_CDEV_HIF_INTR_EN           _IOWR('R', 2, int)
 116
 117  int pfe_cdev_init(void);
 118  void pfe_cdev_exit(void);