drivers/gpu/host1x/hw/intr_hw.c

   1 /*
   2  * Tegra host1x Interrupt Management
   3  *
   4  * Copyright (C) 2010 Google, Inc.
   5  * Copyright (c) 2010-2013, NVIDIA Corporation.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2, as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <linux/interrupt.h>
  21 #include <linux/irq.h>
  22 #include <linux/io.h>
  23
  24 #include "../intr.h"
  25 #include "../dev.h"
  26
  27 /*
  28  * Sync point threshold interrupt service function
  29  * Handles sync point threshold triggers, in interrupt context
  30  */
  31 static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt)
  32 {
  33         unsigned int id = syncpt->id;
  34         struct host1x *host = syncpt->host;
  35
  36         host1x_sync_writel(host, BIT(id % 32),
  37                 HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
  38         host1x_sync_writel(host, BIT(id % 32),
  39                 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
  40
  41         schedule_work(&syncpt->intr.work);
  42 }
  43
  44 static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
  45 {
  46         struct host1x *host = dev_id;
  47         unsigned long reg;
  48         unsigned int i, id;
  49
  50         for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) {
  51                 reg = host1x_sync_readl(host,
  52                         HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
  53                 for_each_set_bit(id, &reg, 32) {
  54                         struct host1x_syncpt *syncpt =
  55                                 host->syncpt + (i * 32 + id);
  56                         host1x_intr_syncpt_handle(syncpt);
  57                 }
  58         }
  59
  60         return IRQ_HANDLED;
  61 }
  62
  63 static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
  64 {
  65         unsigned int i;
  66
  67         for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); ++i) {
  68                 host1x_sync_writel(host, 0xffffffffu,
  69                         HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
  70                 host1x_sync_writel(host, 0xffffffffu,
  71                         HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
  72         }
  73 }
  74
  75 static void intr_hw_init(struct host1x *host, u32 cpm)
  76 {
  77 #if HOST1X_HW < 6
  78         /* disable the ip_busy_timeout. this prevents write drops */
  79         host1x_sync_writel(host, 0, HOST1X_SYNC_IP_BUSY_TIMEOUT);
  80
  81         /*
  82          * increase the auto-ack timout to the maximum value. 2d will hang
  83          * otherwise on Tegra2.
  84          */
  85         host1x_sync_writel(host, 0xff, HOST1X_SYNC_CTXSW_TIMEOUT_CFG);
  86
  87         /* update host clocks per usec */
  88         host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK);
  89 #endif
  90 }
  91
  92 static int
  93 _host1x_intr_init_host_sync(struct host1x *host, u32 cpm,
  94                             void (*syncpt_thresh_work)(struct work_struct *))
  95 {
  96         unsigned int i;
  97         int err;
  98
  99         host1x_hw_intr_disable_all_syncpt_intrs(host);
 100
 101         for (i = 0; i < host->info->nb_pts; i++)
 102                 INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work);
 103
 104         err = devm_request_irq(host->dev, host->intr_syncpt_irq,
 105                                syncpt_thresh_isr, IRQF_SHARED,
 106                                "host1x_syncpt", host);
 107         if (err < 0) {
 108                 WARN_ON(1);
 109                 return err;
 110         }
 111
 112         intr_hw_init(host, cpm);
 113
 114         return 0;
 115 }
 116
 117 static void _host1x_intr_set_syncpt_threshold(struct host1x *host,
 118                                               unsigned int id,
 119                                               u32 thresh)
 120 {
 121         host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id));
 122 }
 123
 124 static void _host1x_intr_enable_syncpt_intr(struct host1x *host,
 125                                             unsigned int id)
 126 {
 127         host1x_sync_writel(host, BIT(id % 32),
 128                 HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32));
 129 }
 130
 131 static void _host1x_intr_disable_syncpt_intr(struct host1x *host,
 132                                              unsigned int id)
 133 {
 134         host1x_sync_writel(host, BIT(id % 32),
 135                 HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
 136         host1x_sync_writel(host, BIT(id % 32),
 137                 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
 138 }
 139
 140 static int _host1x_free_syncpt_irq(struct host1x *host)
 141 {
 142         unsigned int i;
 143
 144         devm_free_irq(host->dev, host->intr_syncpt_irq, host);
 145
 146         for (i = 0; i < host->info->nb_pts; i++)
 147                 cancel_work_sync(&host->syncpt[i].intr.work);
 148
 149         return 0;
 150 }
 151
 152 static const struct host1x_intr_ops host1x_intr_ops = {
 153         .init_host_sync = _host1x_intr_init_host_sync,
 154         .set_syncpt_threshold = _host1x_intr_set_syncpt_threshold,
 155         .enable_syncpt_intr = _host1x_intr_enable_syncpt_intr,
 156         .disable_syncpt_intr = _host1x_intr_disable_syncpt_intr,
 157         .disable_all_syncpt_intrs = _host1x_intr_disable_all_syncpt_intrs,
 158         .free_syncpt_irq = _host1x_free_syncpt_irq,
 159 };