drivers/gpu/host1x/hw/intr_hw.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Tegra host1x Interrupt Management
   4  *
   5  * Copyright (C) 2010 Google, Inc.
   6  * Copyright (c) 2010-2013, NVIDIA Corporation.
   7  */
   8
   9 #include <linux/io.h>
  10
  11 #include "../intr.h"
  12 #include "../dev.h"
  13
  14 static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
  15 {
  16         struct host1x_intr_irq_data *irq_data = dev_id;
  17         struct host1x *host = irq_data->host;
  18         unsigned long reg;
  19         unsigned int i, id;
  20
  21         for (i = irq_data->offset; i < DIV_ROUND_UP(host->info->nb_pts, 32);
  22              i += host->num_syncpt_irqs) {
  23                 reg = host1x_sync_readl(host,
  24                         HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
  25
  26                 host1x_sync_writel(host, reg,
  27                         HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
  28                 host1x_sync_writel(host, reg,
  29                         HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
  30
  31                 for_each_set_bit(id, &reg, 32)
  32                         host1x_intr_handle_interrupt(host, i * 32 + id);
  33         }
  34
  35         return IRQ_HANDLED;
  36 }
  37
  38 static void host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
  39 {
  40         unsigned int i;
  41
  42         for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); ++i) {
  43                 host1x_sync_writel(host, 0xffffffffu,
  44                         HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
  45                 host1x_sync_writel(host, 0xffffffffu,
  46                         HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
  47         }
  48 }
  49
  50 static int
  51 host1x_intr_init_host_sync(struct host1x *host, u32 cpm)
  52 {
  53 #if HOST1X_HW < 6
  54         /* disable the ip_busy_timeout. this prevents write drops */
  55         host1x_sync_writel(host, 0, HOST1X_SYNC_IP_BUSY_TIMEOUT);
  56
  57         /*
  58          * increase the auto-ack timout to the maximum value. 2d will hang
  59          * otherwise on Tegra2.
  60          */
  61         host1x_sync_writel(host, 0xff, HOST1X_SYNC_CTXSW_TIMEOUT_CFG);
  62
  63         /* update host clocks per usec */
  64         host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK);
  65 #endif
  66 #if HOST1X_HW >= 8
  67         u32 id;
  68
  69         /*
  70          * Program threshold interrupt destination among 8 lines per VM,
  71          * per syncpoint. For each group of 32 syncpoints (corresponding to one
  72          * interrupt status register), direct to one interrupt line, going
  73          * around in a round robin fashion.
  74          */
  75         for (id = 0; id < host->info->nb_pts; id++) {
  76                 u32 reg_offset = id / 32;
  77                 u32 irq_index = reg_offset % host->num_syncpt_irqs;
  78
  79                 host1x_sync_writel(host, irq_index, HOST1X_SYNC_SYNCPT_INTR_DEST(id));
  80         }
  81 #endif
  82
  83         return 0;
  84 }
  85
  86 static void host1x_intr_set_syncpt_threshold(struct host1x *host,
  87                                               unsigned int id,
  88                                               u32 thresh)
  89 {
  90         host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id));
  91 }
  92
  93 static void host1x_intr_enable_syncpt_intr(struct host1x *host,
  94                                             unsigned int id)
  95 {
  96         host1x_sync_writel(host, BIT(id % 32),
  97                 HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32));
  98 }
  99
 100 static void host1x_intr_disable_syncpt_intr(struct host1x *host,
 101                                              unsigned int id)
 102 {
 103         host1x_sync_writel(host, BIT(id % 32),
 104                 HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
 105         host1x_sync_writel(host, BIT(id % 32),
 106                 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
 107 }
 108
 109 static const struct host1x_intr_ops host1x_intr_ops = {
 110         .init_host_sync = host1x_intr_init_host_sync,
 111         .set_syncpt_threshold = host1x_intr_set_syncpt_threshold,
 112         .enable_syncpt_intr = host1x_intr_enable_syncpt_intr,
 113         .disable_syncpt_intr = host1x_intr_disable_syncpt_intr,
 114         .disable_all_syncpt_intrs = host1x_intr_disable_all_syncpt_intrs,
 115         .isr = syncpt_thresh_isr,
 116 };