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 struct host1x_intr_irq_data { 17 struct host1x *host; 18 u32 offset; 19 }; 20 21 static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id) 22 { 23 struct host1x_intr_irq_data *irq_data = dev_id; 24 struct host1x *host = irq_data->host; 25 unsigned long reg; 26 unsigned int i, id; 27 28 for (i = irq_data->offset; i < DIV_ROUND_UP(host->info->nb_pts, 32); 29 i += host->num_syncpt_irqs) { 30 reg = host1x_sync_readl(host, 31 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i)); 32 33 host1x_sync_writel(host, reg, 34 HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i)); 35 host1x_sync_writel(host, reg, 36 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i)); 37 38 for_each_set_bit(id, ®, 32) 39 host1x_intr_handle_interrupt(host, i * 32 + id); 40 } 41 42 return IRQ_HANDLED; 43 } 44 45 static void host1x_intr_disable_all_syncpt_intrs(struct host1x *host) 46 { 47 unsigned int i; 48 49 for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); ++i) { 50 host1x_sync_writel(host, 0xffffffffu, 51 HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i)); 52 host1x_sync_writel(host, 0xffffffffu, 53 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i)); 54 } 55 } 56 57 static void intr_hw_init(struct host1x *host, u32 cpm) 58 { 59 #if HOST1X_HW < 6 60 /* disable the ip_busy_timeout. this prevents write drops */ 61 host1x_sync_writel(host, 0, HOST1X_SYNC_IP_BUSY_TIMEOUT); 62 63 /* 64 * increase the auto-ack timout to the maximum value. 2d will hang 65 * otherwise on Tegra2. 66 */ 67 host1x_sync_writel(host, 0xff, HOST1X_SYNC_CTXSW_TIMEOUT_CFG); 68 69 /* update host clocks per usec */ 70 host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK); 71 #endif 72 #if HOST1X_HW >= 8 73 u32 id; 74 75 /* 76 * Program threshold interrupt destination among 8 lines per VM, 77 * per syncpoint. For each group of 32 syncpoints (corresponding to one 78 * interrupt status register), direct to one interrupt line, going 79 * around in a round robin fashion. 80 */ 81 for (id = 0; id < host->info->nb_pts; id++) { 82 u32 reg_offset = id / 32; 83 u32 irq_index = reg_offset % host->num_syncpt_irqs; 84 85 host1x_sync_writel(host, irq_index, HOST1X_SYNC_SYNCPT_INTR_DEST(id)); 86 } 87 #endif 88 } 89 90 static int 91 host1x_intr_init_host_sync(struct host1x *host, u32 cpm) 92 { 93 int err, i; 94 struct host1x_intr_irq_data *irq_data; 95 96 irq_data = devm_kcalloc(host->dev, host->num_syncpt_irqs, sizeof(irq_data[0]), GFP_KERNEL); 97 if (!irq_data) 98 return -ENOMEM; 99 100 host1x_hw_intr_disable_all_syncpt_intrs(host); 101 102 for (i = 0; i < host->num_syncpt_irqs; i++) { 103 irq_data[i].host = host; 104 irq_data[i].offset = i; 105 106 err = devm_request_irq(host->dev, host->syncpt_irqs[i], 107 syncpt_thresh_isr, IRQF_SHARED, 108 "host1x_syncpt", &irq_data[i]); 109 if (err < 0) 110 return err; 111 } 112 113 intr_hw_init(host, cpm); 114 115 return 0; 116 } 117 118 static void host1x_intr_set_syncpt_threshold(struct host1x *host, 119 unsigned int id, 120 u32 thresh) 121 { 122 host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id)); 123 } 124 125 static void host1x_intr_enable_syncpt_intr(struct host1x *host, 126 unsigned int id) 127 { 128 host1x_sync_writel(host, BIT(id % 32), 129 HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32)); 130 } 131 132 static void host1x_intr_disable_syncpt_intr(struct host1x *host, 133 unsigned int id) 134 { 135 host1x_sync_writel(host, BIT(id % 32), 136 HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32)); 137 host1x_sync_writel(host, BIT(id % 32), 138 HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32)); 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 }; 148