1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C)2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. 4 */ 5 6 #include <linux/init.h> 7 #include <linux/device.h> 8 #include <linux/errno.h> 9 #include <linux/io.h> 10 #include <linux/irqchip.h> 11 #include <linux/irqdomain.h> 12 #include <linux/of.h> 13 #include <linux/of_address.h> 14 15 #include <asm/mach/irq.h> 16 #include <asm/exception.h> 17 18 #include "common.h" 19 #include "hardware.h" 20 #include "irq-common.h" 21 22 /* 23 ***************************************** 24 * TZIC Registers * 25 ***************************************** 26 */ 27 28 #define TZIC_INTCNTL 0x0000 /* Control register */ 29 #define TZIC_INTTYPE 0x0004 /* Controller Type register */ 30 #define TZIC_IMPID 0x0008 /* Distributor Implementer Identification */ 31 #define TZIC_PRIOMASK 0x000C /* Priority Mask Reg */ 32 #define TZIC_SYNCCTRL 0x0010 /* Synchronizer Control register */ 33 #define TZIC_DSMINT 0x0014 /* DSM interrupt Holdoffregister */ 34 #define TZIC_INTSEC0(i) (0x0080 + ((i) << 2)) /* Interrupt Security Reg 0 */ 35 #define TZIC_ENSET0(i) (0x0100 + ((i) << 2)) /* Enable Set Reg 0 */ 36 #define TZIC_ENCLEAR0(i) (0x0180 + ((i) << 2)) /* Enable Clear Reg 0 */ 37 #define TZIC_SRCSET0 0x0200 /* Source Set Register 0 */ 38 #define TZIC_SRCCLAR0 0x0280 /* Source Clear Register 0 */ 39 #define TZIC_PRIORITY0 0x0400 /* Priority Register 0 */ 40 #define TZIC_PND0 0x0D00 /* Pending Register 0 */ 41 #define TZIC_HIPND(i) (0x0D80+ ((i) << 2)) /* High Priority Pending Register */ 42 #define TZIC_WAKEUP0(i) (0x0E00 + ((i) << 2)) /* Wakeup Config Register */ 43 #define TZIC_SWINT 0x0F00 /* Software Interrupt Rigger Register */ 44 #define TZIC_ID0 0x0FD0 /* Indentification Register 0 */ 45 46 static void __iomem *tzic_base; 47 static struct irq_domain *domain; 48 49 #define TZIC_NUM_IRQS 128 50 51 #ifdef CONFIG_FIQ 52 static int tzic_set_irq_fiq(unsigned int hwirq, unsigned int type) 53 { 54 unsigned int index, mask, value; 55 56 index = hwirq >> 5; 57 if (unlikely(index >= 4)) 58 return -EINVAL; 59 mask = 1U << (hwirq & 0x1F); 60 61 value = imx_readl(tzic_base + TZIC_INTSEC0(index)) | mask; 62 if (type) 63 value &= ~mask; 64 imx_writel(value, tzic_base + TZIC_INTSEC0(index)); 65 66 return 0; 67 } 68 #else 69 #define tzic_set_irq_fiq NULL 70 #endif 71 72 #ifdef CONFIG_PM 73 static void tzic_irq_suspend(struct irq_data *d) 74 { 75 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 76 int idx = d->hwirq >> 5; 77 78 imx_writel(gc->wake_active, tzic_base + TZIC_WAKEUP0(idx)); 79 } 80 81 static void tzic_irq_resume(struct irq_data *d) 82 { 83 int idx = d->hwirq >> 5; 84 85 imx_writel(imx_readl(tzic_base + TZIC_ENSET0(idx)), 86 tzic_base + TZIC_WAKEUP0(idx)); 87 } 88 89 #else 90 #define tzic_irq_suspend NULL 91 #define tzic_irq_resume NULL 92 #endif 93 94 static struct mxc_extra_irq tzic_extra_irq = { 95 #ifdef CONFIG_FIQ 96 .set_irq_fiq = tzic_set_irq_fiq, 97 #endif 98 }; 99 100 static __init void tzic_init_gc(int idx, unsigned int irq_start) 101 { 102 struct irq_chip_generic *gc; 103 struct irq_chip_type *ct; 104 105 gc = irq_alloc_generic_chip("tzic", 1, irq_start, tzic_base, 106 handle_level_irq); 107 gc->private = &tzic_extra_irq; 108 gc->wake_enabled = IRQ_MSK(32); 109 110 ct = gc->chip_types; 111 ct->chip.irq_mask = irq_gc_mask_disable_reg; 112 ct->chip.irq_unmask = irq_gc_unmask_enable_reg; 113 ct->chip.irq_set_wake = irq_gc_set_wake; 114 ct->chip.irq_suspend = tzic_irq_suspend; 115 ct->chip.irq_resume = tzic_irq_resume; 116 ct->regs.disable = TZIC_ENCLEAR0(idx); 117 ct->regs.enable = TZIC_ENSET0(idx); 118 119 irq_setup_generic_chip(gc, IRQ_MSK(32), 0, IRQ_NOREQUEST, 0); 120 } 121 122 static void __exception_irq_entry tzic_handle_irq(struct pt_regs *regs) 123 { 124 u32 stat; 125 int i, irqofs, handled; 126 127 do { 128 handled = 0; 129 130 for (i = 0; i < 4; i++) { 131 stat = imx_readl(tzic_base + TZIC_HIPND(i)) & 132 imx_readl(tzic_base + TZIC_INTSEC0(i)); 133 134 while (stat) { 135 handled = 1; 136 irqofs = fls(stat) - 1; 137 handle_domain_irq(domain, irqofs + i * 32, regs); 138 stat &= ~(1 << irqofs); 139 } 140 } 141 } while (handled); 142 } 143 144 /* 145 * This function initializes the TZIC hardware and disables all the 146 * interrupts. It registers the interrupt enable and disable functions 147 * to the kernel for each interrupt source. 148 */ 149 static int __init tzic_init_dt(struct device_node *np, struct device_node *p) 150 { 151 int irq_base; 152 int i; 153 154 tzic_base = of_iomap(np, 0); 155 WARN_ON(!tzic_base); 156 157 /* put the TZIC into the reset value with 158 * all interrupts disabled 159 */ 160 i = imx_readl(tzic_base + TZIC_INTCNTL); 161 162 imx_writel(0x80010001, tzic_base + TZIC_INTCNTL); 163 imx_writel(0x1f, tzic_base + TZIC_PRIOMASK); 164 imx_writel(0x02, tzic_base + TZIC_SYNCCTRL); 165 166 for (i = 0; i < 4; i++) 167 imx_writel(0xFFFFFFFF, tzic_base + TZIC_INTSEC0(i)); 168 169 /* disable all interrupts */ 170 for (i = 0; i < 4; i++) 171 imx_writel(0xFFFFFFFF, tzic_base + TZIC_ENCLEAR0(i)); 172 173 /* all IRQ no FIQ Warning :: No selection */ 174 175 irq_base = irq_alloc_descs(-1, 0, TZIC_NUM_IRQS, numa_node_id()); 176 WARN_ON(irq_base < 0); 177 178 domain = irq_domain_add_legacy(np, TZIC_NUM_IRQS, irq_base, 0, 179 &irq_domain_simple_ops, NULL); 180 WARN_ON(!domain); 181 182 for (i = 0; i < 4; i++, irq_base += 32) 183 tzic_init_gc(i, irq_base); 184 185 set_handle_irq(tzic_handle_irq); 186 187 #ifdef CONFIG_FIQ 188 /* Initialize FIQ */ 189 init_FIQ(FIQ_START); 190 #endif 191 192 pr_info("TrustZone Interrupt Controller (TZIC) initialized\n"); 193 194 return 0; 195 } 196 IRQCHIP_DECLARE(tzic, "fsl,tzic", tzic_init_dt); 197 198 /** 199 * tzic_enable_wake() - enable wakeup interrupt 200 * 201 * @return 0 if successful; non-zero otherwise 202 * 203 * This function provides an interrupt synchronization point that is required 204 * by tzic enabled platforms before entering imx specific low power modes (ie, 205 * those low power modes beyond the WAIT_CLOCKED basic ARM WFI only mode). 206 */ 207 int tzic_enable_wake(void) 208 { 209 unsigned int i; 210 211 imx_writel(1, tzic_base + TZIC_DSMINT); 212 if (unlikely(imx_readl(tzic_base + TZIC_DSMINT) == 0)) 213 return -EAGAIN; 214 215 for (i = 0; i < 4; i++) 216 imx_writel(imx_readl(tzic_base + TZIC_ENSET0(i)), 217 tzic_base + TZIC_WAKEUP0(i)); 218 219 return 0; 220 } 221