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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved. * * Author: John Rigby, <jrigby@freescale.com> * * Description: * MPC5121ADS CPLD irq handling */ #undef DEBUG #include <linux/kernel.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/io.h> #include <linux/of_address.h> #include <linux/of_irq.h> static struct device_node *cpld_pic_node; static struct irq_domain *cpld_pic_host; /* * Bits to ignore in the misc_status register * 0x10 touch screen pendown is hard routed to irq1 * 0x02 pci status is read from pci status register */ #define MISC_IGNORE 0x12 /* * Nothing to ignore in pci status register */ #define PCI_IGNORE 0x00 struct cpld_pic { u8 pci_mask; u8 pci_status; u8 route; u8 misc_mask; u8 misc_status; u8 misc_control; }; static struct cpld_pic __iomem *cpld_regs; static void __iomem * irq_to_pic_mask(unsigned int irq) { return irq <= 7 ? &cpld_regs->pci_mask : &cpld_regs->misc_mask; } static unsigned int irq_to_pic_bit(unsigned int irq) { return 1 << (irq & 0x7); } static void cpld_mask_irq(struct irq_data *d) { unsigned int cpld_irq = (unsigned int)irqd_to_hwirq(d); void __iomem *pic_mask = irq_to_pic_mask(cpld_irq); out_8(pic_mask, in_8(pic_mask) | irq_to_pic_bit(cpld_irq)); } static void cpld_unmask_irq(struct irq_data *d) { unsigned int cpld_irq = (unsigned int)irqd_to_hwirq(d); void __iomem *pic_mask = irq_to_pic_mask(cpld_irq); out_8(pic_mask, in_8(pic_mask) & ~irq_to_pic_bit(cpld_irq)); } static struct irq_chip cpld_pic = { .name = "CPLD PIC", .irq_mask = cpld_mask_irq, .irq_ack = cpld_mask_irq, .irq_unmask = cpld_unmask_irq, }; static unsigned int cpld_pic_get_irq(int offset, u8 ignore, u8 __iomem *statusp, u8 __iomem *maskp) { u8 status = in_8(statusp); u8 mask = in_8(maskp); /* ignore don't cares and masked irqs */ status |= (ignore | mask); if (status == 0xff) return ~0; return ffz(status) + offset; } static void cpld_pic_cascade(struct irq_desc *desc) { unsigned int hwirq; hwirq = cpld_pic_get_irq(0, PCI_IGNORE, &cpld_regs->pci_status, &cpld_regs->pci_mask); if (hwirq != ~0) { generic_handle_domain_irq(cpld_pic_host, hwirq); return; } hwirq = cpld_pic_get_irq(8, MISC_IGNORE, &cpld_regs->misc_status, &cpld_regs->misc_mask); if (hwirq != ~0) { generic_handle_domain_irq(cpld_pic_host, hwirq); return; } } static int cpld_pic_host_match(struct irq_domain *h, struct device_node *node, enum irq_domain_bus_token bus_token) { return cpld_pic_node == node; } static int cpld_pic_host_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw) { irq_set_status_flags(virq, IRQ_LEVEL); irq_set_chip_and_handler(virq, &cpld_pic, handle_level_irq); return 0; } static const struct irq_domain_ops cpld_pic_host_ops = { .match = cpld_pic_host_match, .map = cpld_pic_host_map, }; void __init mpc5121_ads_cpld_map(void) { struct device_node *np = NULL; np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121ads-cpld-pic"); if (!np) { printk(KERN_ERR "CPLD PIC init: can not find cpld-pic node\n"); return; } cpld_regs = of_iomap(np, 0); of_node_put(np); } void __init mpc5121_ads_cpld_pic_init(void) { unsigned int cascade_irq; struct device_node *np = NULL; pr_debug("cpld_ic_init\n"); np = of_find_compatible_node(NULL, NULL, "fsl,mpc5121ads-cpld-pic"); if (!np) { printk(KERN_ERR "CPLD PIC init: can not find cpld-pic node\n"); return; } if (!cpld_regs) goto end; cascade_irq = irq_of_parse_and_map(np, 0); if (!cascade_irq) goto end; /* * statically route touch screen pendown through 1 * and ignore it here * route all others through our cascade irq */ out_8(&cpld_regs->route, 0xfd); out_8(&cpld_regs->pci_mask, 0xff); /* unmask pci ints in misc mask */ out_8(&cpld_regs->misc_mask, ~(MISC_IGNORE)); cpld_pic_node = of_node_get(np); cpld_pic_host = irq_domain_add_linear(np, 16, &cpld_pic_host_ops, NULL); if (!cpld_pic_host) { printk(KERN_ERR "CPLD PIC: failed to allocate irq host!\n"); goto end; } irq_set_chained_handler(cascade_irq, cpld_pic_cascade); end: of_node_put(np); } |