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/interrupt.h> 10 #include <linux/irq.h> 11 #include <linux/io.h> 12 13 #include "../intr.h" 14 #include "../dev.h" 15 16 /* 17 * Sync point threshold interrupt service function 18 * Handles sync point threshold triggers, in interrupt context 19 */ 20 static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt) 21 { 22 unsigned int id = syncpt->id; 23 struct host1x *host = syncpt->host; 24 25 host1x_sync_writel(host, BIT(id % 32), 26 HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32)); 27 host1x_sync_writel(host, BIT(id % 32), 28 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32)); 29 30 schedule_work(&syncpt->intr.work); 31 } 32 33 static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id) 34 { 35 struct host1x *host = dev_id; 36 unsigned long reg; 37 unsigned int i, id; 38 39 for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) { 40 reg = host1x_sync_readl(host, 41 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i)); 42 for_each_set_bit(id, ®, 32) { 43 struct host1x_syncpt *syncpt = 44 host->syncpt + (i * 32 + id); 45 host1x_intr_syncpt_handle(syncpt); 46 } 47 } 48 49 return IRQ_HANDLED; 50 } 51 52 static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host) 53 { 54 unsigned int i; 55 56 for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); ++i) { 57 host1x_sync_writel(host, 0xffffffffu, 58 HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i)); 59 host1x_sync_writel(host, 0xffffffffu, 60 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i)); 61 } 62 } 63 64 static void intr_hw_init(struct host1x *host, u32 cpm) 65 { 66 #if HOST1X_HW < 6 67 /* disable the ip_busy_timeout. this prevents write drops */ 68 host1x_sync_writel(host, 0, HOST1X_SYNC_IP_BUSY_TIMEOUT); 69 70 /* 71 * increase the auto-ack timout to the maximum value. 2d will hang 72 * otherwise on Tegra2. 73 */ 74 host1x_sync_writel(host, 0xff, HOST1X_SYNC_CTXSW_TIMEOUT_CFG); 75 76 /* update host clocks per usec */ 77 host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK); 78 #endif 79 } 80 81 static int 82 _host1x_intr_init_host_sync(struct host1x *host, u32 cpm, 83 void (*syncpt_thresh_work)(struct work_struct *)) 84 { 85 unsigned int i; 86 int err; 87 88 host1x_hw_intr_disable_all_syncpt_intrs(host); 89 90 for (i = 0; i < host->info->nb_pts; i++) 91 INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work); 92 93 err = devm_request_irq(host->dev, host->intr_syncpt_irq, 94 syncpt_thresh_isr, IRQF_SHARED, 95 "host1x_syncpt", host); 96 if (err < 0) { 97 WARN_ON(1); 98 return err; 99 } 100 101 intr_hw_init(host, cpm); 102 103 return 0; 104 } 105 106 static void _host1x_intr_set_syncpt_threshold(struct host1x *host, 107 unsigned int id, 108 u32 thresh) 109 { 110 host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id)); 111 } 112 113 static void _host1x_intr_enable_syncpt_intr(struct host1x *host, 114 unsigned int id) 115 { 116 host1x_sync_writel(host, BIT(id % 32), 117 HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32)); 118 } 119 120 static void _host1x_intr_disable_syncpt_intr(struct host1x *host, 121 unsigned int id) 122 { 123 host1x_sync_writel(host, BIT(id % 32), 124 HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32)); 125 host1x_sync_writel(host, BIT(id % 32), 126 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32)); 127 } 128 129 static int _host1x_free_syncpt_irq(struct host1x *host) 130 { 131 unsigned int i; 132 133 devm_free_irq(host->dev, host->intr_syncpt_irq, host); 134 135 for (i = 0; i < host->info->nb_pts; i++) 136 cancel_work_sync(&host->syncpt[i].intr.work); 137 138 return 0; 139 } 140 141 static const struct host1x_intr_ops host1x_intr_ops = { 142 .init_host_sync = _host1x_intr_init_host_sync, 143 .set_syncpt_threshold = _host1x_intr_set_syncpt_threshold, 144 .enable_syncpt_intr = _host1x_intr_enable_syncpt_intr, 145 .disable_syncpt_intr = _host1x_intr_disable_syncpt_intr, 146 .disable_all_syncpt_intrs = _host1x_intr_disable_all_syncpt_intrs, 147 .free_syncpt_irq = _host1x_free_syncpt_irq, 148 }; 149