Quelle  intr_hw.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Tegra host1x Interrupt Management
 *
 * Copyright (C) 2010 Google, Inc.
 * Copyright (c) 2010-2013, NVIDIA Corporation.
 */

#include <linux/io.h>

#include "../intr.h"
#include "../dev.h"

static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
{
 struct host1x_intr_irq_data *irq_data = dev_id;
 struct host1x *host = irq_data->host;
 unsigned long reg;
 unsigned int i, id;

 for (i = irq_data->offset; i < DIV_ROUND_UP(host->info->nb_pts, 32);
      i += host->num_syncpt_irqs) {
  reg = host1x_sync_readl(host,
   HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));

  host1x_sync_writel(host, reg,
   HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
  host1x_sync_writel(host, reg,
   HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));

  for_each_set_bit(id, ®, 32)
   host1x_intr_handle_interrupt(host, i * 32 + id);
 }

 return IRQ_HANDLED;
}

static void host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
{
 unsigned int i;

 for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); ++i) {
  host1x_sync_writel(host, 0xffffffffu,
   HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
  host1x_sync_writel(host, 0xffffffffu,
   HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
 }
}

static int
host1x_intr_init_host_sync(struct host1x *host, u32 cpm)
{
#if HOST1X_HW < 6
 /* disable the ip_busy_timeout. this prevents write drops */
 host1x_sync_writel(host, 0, HOST1X_SYNC_IP_BUSY_TIMEOUT);

 /*
 * increase the auto-ack timout to the maximum value. 2d will hang
 * otherwise on Tegra2.
 */
 host1x_sync_writel(host, 0xff, HOST1X_SYNC_CTXSW_TIMEOUT_CFG);

 /* update host clocks per usec */
 host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK);
#endif
#if HOST1X_HW >= 8
 u32 id;

 /*
 * Program threshold interrupt destination among 8 lines per VM,
 * per syncpoint. For each group of 32 syncpoints (corresponding to one
 * interrupt status register), direct to one interrupt line, going
 * around in a round robin fashion.
 */
 for (id = 0; id < host->info->nb_pts; id++) {
  u32 reg_offset = id / 32;
  u32 irq_index = reg_offset % host->num_syncpt_irqs;

  host1x_sync_writel(host, irq_index, HOST1X_SYNC_SYNCPT_INTR_DEST(id));
 }
#endif

 return 0;
}

static void host1x_intr_set_syncpt_threshold(struct host1x *host,
           unsigned int id,
           u32 thresh)
{
 host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id));
}

static void host1x_intr_enable_syncpt_intr(struct host1x *host,
         unsigned int id)
{
 host1x_sync_writel(host, BIT(id % 32),
  HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32));
}

static void host1x_intr_disable_syncpt_intr(struct host1x *host,
          unsigned int id)
{
 host1x_sync_writel(host, BIT(id % 32),
  HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
 host1x_sync_writel(host, BIT(id % 32),
  HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
}

static const struct host1x_intr_ops host1x_intr_ops = {
 .init_host_sync = host1x_intr_init_host_sync,
 .set_syncpt_threshold = host1x_intr_set_syncpt_threshold,
 .enable_syncpt_intr = host1x_intr_enable_syncpt_intr,
 .disable_syncpt_intr = host1x_intr_disable_syncpt_intr,
 .disable_all_syncpt_intrs = host1x_intr_disable_all_syncpt_intrs,
 .isr = syncpt_thresh_isr,
};