diff options
Diffstat (limited to 'kernel/drivers/gpu/host1x/hw/intr_hw.c')
| -rw-r--r-- | kernel/drivers/gpu/host1x/hw/intr_hw.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/kernel/drivers/gpu/host1x/hw/intr_hw.c b/kernel/drivers/gpu/host1x/hw/intr_hw.c new file mode 100644 index 000000000..498b37e39 --- /dev/null +++ b/kernel/drivers/gpu/host1x/hw/intr_hw.c @@ -0,0 +1,142 @@ +/* + * Tegra host1x Interrupt Management + * + * Copyright (C) 2010 Google, Inc. + * Copyright (c) 2010-2013, NVIDIA Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/io.h> + +#include "../intr.h" +#include "../dev.h" + +/* + * Sync point threshold interrupt service function + * Handles sync point threshold triggers, in interrupt context + */ +static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt) +{ + unsigned int id = syncpt->id; + struct host1x *host = syncpt->host; + + host1x_sync_writel(host, BIT_MASK(id), + HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(BIT_WORD(id))); + host1x_sync_writel(host, BIT_MASK(id), + HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(BIT_WORD(id))); + + queue_work(host->intr_wq, &syncpt->intr.work); +} + +static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id) +{ + struct host1x *host = dev_id; + unsigned long reg; + int i, id; + + for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) { + reg = host1x_sync_readl(host, + HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i)); + for_each_set_bit(id, ®, BITS_PER_LONG) { + struct host1x_syncpt *syncpt = + host->syncpt + (i * BITS_PER_LONG + id); + host1x_intr_syncpt_handle(syncpt); + } + } + + return IRQ_HANDLED; +} + +static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host) +{ + u32 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, + void (*syncpt_thresh_work)(struct work_struct *)) +{ + int i, err; + + host1x_hw_intr_disable_all_syncpt_intrs(host); + + for (i = 0; i < host->info->nb_pts; i++) + INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work); + + err = devm_request_irq(host->dev, host->intr_syncpt_irq, + syncpt_thresh_isr, IRQF_SHARED, + "host1x_syncpt", host); + if (IS_ERR_VALUE(err)) { + WARN_ON(1); + return err; + } + + /* 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); + + return 0; +} + +static void _host1x_intr_set_syncpt_threshold(struct host1x *host, + u32 id, u32 thresh) +{ + host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id)); +} + +static void _host1x_intr_enable_syncpt_intr(struct host1x *host, u32 id) +{ + host1x_sync_writel(host, BIT_MASK(id), + HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(BIT_WORD(id))); +} + +static void _host1x_intr_disable_syncpt_intr(struct host1x *host, u32 id) +{ + host1x_sync_writel(host, BIT_MASK(id), + HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(BIT_WORD(id))); + host1x_sync_writel(host, BIT_MASK(id), + HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(BIT_WORD(id))); +} + +static int _host1x_free_syncpt_irq(struct host1x *host) +{ + devm_free_irq(host->dev, host->intr_syncpt_irq, host); + flush_workqueue(host->intr_wq); + return 0; +} + +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, + .free_syncpt_irq = _host1x_free_syncpt_irq, +}; |