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1 | /* | |
2 | * Copyright (C) 2007-2013 Michal Simek <monstr@monstr.eu> | |
3 | * Copyright (C) 2012-2013 Xilinx, Inc. | |
4 | * Copyright (C) 2007-2009 PetaLogix | |
5 | * Copyright (C) 2006 Atmark Techno, Inc. | |
6 | * | |
7 | * This file is subject to the terms and conditions of the GNU General Public | |
8 | * License. See the file "COPYING" in the main directory of this archive | |
9 | * for more details. | |
10 | */ | |
11 | ||
12 | #include <linux/irqdomain.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/of_address.h> | |
15 | #include <linux/io.h> | |
16 | #include <linux/bug.h> | |
17 | ||
18 | #include "../../drivers/irqchip/irqchip.h" | |
19 | ||
20 | static void __iomem *intc_baseaddr; | |
21 | ||
22 | /* No one else should require these constants, so define them locally here. */ | |
23 | #define ISR 0x00 /* Interrupt Status Register */ | |
24 | #define IPR 0x04 /* Interrupt Pending Register */ | |
25 | #define IER 0x08 /* Interrupt Enable Register */ | |
26 | #define IAR 0x0c /* Interrupt Acknowledge Register */ | |
27 | #define SIE 0x10 /* Set Interrupt Enable bits */ | |
28 | #define CIE 0x14 /* Clear Interrupt Enable bits */ | |
29 | #define IVR 0x18 /* Interrupt Vector Register */ | |
30 | #define MER 0x1c /* Master Enable Register */ | |
31 | ||
32 | #define MER_ME (1<<0) | |
33 | #define MER_HIE (1<<1) | |
34 | ||
35 | static unsigned int (*read_fn)(void __iomem *); | |
36 | static void (*write_fn)(u32, void __iomem *); | |
37 | ||
38 | static void intc_write32(u32 val, void __iomem *addr) | |
39 | { | |
40 | iowrite32(val, addr); | |
41 | } | |
42 | ||
43 | static unsigned int intc_read32(void __iomem *addr) | |
44 | { | |
45 | return ioread32(addr); | |
46 | } | |
47 | ||
48 | static void intc_write32_be(u32 val, void __iomem *addr) | |
49 | { | |
50 | iowrite32be(val, addr); | |
51 | } | |
52 | ||
53 | static unsigned int intc_read32_be(void __iomem *addr) | |
54 | { | |
55 | return ioread32be(addr); | |
56 | } | |
57 | ||
58 | static void intc_enable_or_unmask(struct irq_data *d) | |
59 | { | |
60 | unsigned long mask = 1 << d->hwirq; | |
61 | ||
62 | pr_debug("enable_or_unmask: %ld\n", d->hwirq); | |
63 | ||
64 | /* ack level irqs because they can't be acked during | |
65 | * ack function since the handle_level_irq function | |
66 | * acks the irq before calling the interrupt handler | |
67 | */ | |
68 | if (irqd_is_level_type(d)) | |
69 | write_fn(mask, intc_baseaddr + IAR); | |
70 | ||
71 | write_fn(mask, intc_baseaddr + SIE); | |
72 | } | |
73 | ||
74 | static void intc_disable_or_mask(struct irq_data *d) | |
75 | { | |
76 | pr_debug("disable: %ld\n", d->hwirq); | |
77 | write_fn(1 << d->hwirq, intc_baseaddr + CIE); | |
78 | } | |
79 | ||
80 | static void intc_ack(struct irq_data *d) | |
81 | { | |
82 | pr_debug("ack: %ld\n", d->hwirq); | |
83 | write_fn(1 << d->hwirq, intc_baseaddr + IAR); | |
84 | } | |
85 | ||
86 | static void intc_mask_ack(struct irq_data *d) | |
87 | { | |
88 | unsigned long mask = 1 << d->hwirq; | |
89 | ||
90 | pr_debug("disable_and_ack: %ld\n", d->hwirq); | |
91 | write_fn(mask, intc_baseaddr + CIE); | |
92 | write_fn(mask, intc_baseaddr + IAR); | |
93 | } | |
94 | ||
95 | static struct irq_chip intc_dev = { | |
96 | .name = "Xilinx INTC", | |
97 | .irq_unmask = intc_enable_or_unmask, | |
98 | .irq_mask = intc_disable_or_mask, | |
99 | .irq_ack = intc_ack, | |
100 | .irq_mask_ack = intc_mask_ack, | |
101 | }; | |
102 | ||
103 | static struct irq_domain *root_domain; | |
104 | ||
105 | unsigned int get_irq(void) | |
106 | { | |
107 | unsigned int hwirq, irq = -1; | |
108 | ||
109 | hwirq = read_fn(intc_baseaddr + IVR); | |
110 | if (hwirq != -1U) | |
111 | irq = irq_find_mapping(root_domain, hwirq); | |
112 | ||
113 | pr_debug("get_irq: hwirq=%d, irq=%d\n", hwirq, irq); | |
114 | ||
115 | return irq; | |
116 | } | |
117 | ||
118 | static int xintc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw) | |
119 | { | |
120 | u32 intr_mask = (u32)d->host_data; | |
121 | ||
122 | if (intr_mask & (1 << hw)) { | |
123 | irq_set_chip_and_handler_name(irq, &intc_dev, | |
124 | handle_edge_irq, "edge"); | |
125 | irq_clear_status_flags(irq, IRQ_LEVEL); | |
126 | } else { | |
127 | irq_set_chip_and_handler_name(irq, &intc_dev, | |
128 | handle_level_irq, "level"); | |
129 | irq_set_status_flags(irq, IRQ_LEVEL); | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static const struct irq_domain_ops xintc_irq_domain_ops = { | |
135 | .xlate = irq_domain_xlate_onetwocell, | |
136 | .map = xintc_map, | |
137 | }; | |
138 | ||
139 | static int __init xilinx_intc_of_init(struct device_node *intc, | |
140 | struct device_node *parent) | |
141 | { | |
142 | u32 nr_irq, intr_mask; | |
143 | int ret; | |
144 | ||
145 | intc_baseaddr = of_iomap(intc, 0); | |
146 | BUG_ON(!intc_baseaddr); | |
147 | ||
148 | ret = of_property_read_u32(intc, "xlnx,num-intr-inputs", &nr_irq); | |
149 | if (ret < 0) { | |
150 | pr_err("%s: unable to read xlnx,num-intr-inputs\n", __func__); | |
151 | return -EINVAL; | |
152 | } | |
153 | ||
154 | ret = of_property_read_u32(intc, "xlnx,kind-of-intr", &intr_mask); | |
155 | if (ret < 0) { | |
156 | pr_err("%s: unable to read xlnx,kind-of-intr\n", __func__); | |
157 | return -EINVAL; | |
158 | } | |
159 | ||
160 | if (intr_mask > (u32)((1ULL << nr_irq) - 1)) | |
161 | pr_info(" ERROR: Mismatch in kind-of-intr param\n"); | |
162 | ||
163 | pr_info("%s: num_irq=%d, edge=0x%x\n", | |
164 | intc->full_name, nr_irq, intr_mask); | |
165 | ||
166 | write_fn = intc_write32; | |
167 | read_fn = intc_read32; | |
168 | ||
169 | /* | |
170 | * Disable all external interrupts until they are | |
171 | * explicity requested. | |
172 | */ | |
173 | write_fn(0, intc_baseaddr + IER); | |
174 | ||
175 | /* Acknowledge any pending interrupts just in case. */ | |
176 | write_fn(0xffffffff, intc_baseaddr + IAR); | |
177 | ||
178 | /* Turn on the Master Enable. */ | |
179 | write_fn(MER_HIE | MER_ME, intc_baseaddr + MER); | |
180 | if (!(read_fn(intc_baseaddr + MER) & (MER_HIE | MER_ME))) { | |
181 | write_fn = intc_write32_be; | |
182 | read_fn = intc_read32_be; | |
183 | write_fn(MER_HIE | MER_ME, intc_baseaddr + MER); | |
184 | } | |
185 | ||
186 | /* Yeah, okay, casting the intr_mask to a void* is butt-ugly, but I'm | |
187 | * lazy and Michal can clean it up to something nicer when he tests | |
188 | * and commits this patch. ~~gcl */ | |
189 | root_domain = irq_domain_add_linear(intc, nr_irq, &xintc_irq_domain_ops, | |
190 | (void *)intr_mask); | |
191 | ||
192 | irq_set_default_host(root_domain); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | IRQCHIP_DECLARE(xilinx_intc, "xlnx,xps-intc-1.00.a", xilinx_intc_of_init); |