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 #if HOST1X_HW >= 8 80 u32 id; 81 82 /* 83 * Program threshold interrupt destination among 8 lines per VM, 84 * per syncpoint. For now, just direct all to the first interrupt 85 * line. 86 */ 87 for (id = 0; id < host->info->nb_pts; id++) 88 host1x_sync_writel(host, 0, HOST1X_SYNC_SYNCPT_INTR_DEST(id)); 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 }; 160