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Linux/arch/powerpc/platforms/embedded6xx/flipper-pic.c

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  1 /*
  2  * arch/powerpc/platforms/embedded6xx/flipper-pic.c
  3  *
  4  * Nintendo GameCube/Wii "Flipper" interrupt controller support.
  5  * Copyright (C) 2004-2009 The GameCube Linux Team
  6  * Copyright (C) 2007,2008,2009 Albert Herranz
  7  *
  8  * This program is free software; you can redistribute it and/or
  9  * modify it under the terms of the GNU General Public License
 10  * as published by the Free Software Foundation; either version 2
 11  * of the License, or (at your option) any later version.
 12  *
 13  */
 14 #define DRV_MODULE_NAME "flipper-pic"
 15 #define pr_fmt(fmt) DRV_MODULE_NAME ": " fmt
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/init.h>
 19 #include <linux/irq.h>
 20 #include <linux/of.h>
 21 #include <linux/of_address.h>
 22 #include <asm/io.h>
 23 
 24 #include "flipper-pic.h"
 25 
 26 #define FLIPPER_NR_IRQS         32
 27 
 28 /*
 29  * Each interrupt has a corresponding bit in both
 30  * the Interrupt Cause (ICR) and Interrupt Mask (IMR) registers.
 31  *
 32  * Enabling/disabling an interrupt line involves setting/clearing
 33  * the corresponding bit in IMR.
 34  * Except for the RSW interrupt, all interrupts get deasserted automatically
 35  * when the source deasserts the interrupt.
 36  */
 37 #define FLIPPER_ICR             0x00
 38 #define FLIPPER_ICR_RSS         (1<<16) /* reset switch state */
 39 
 40 #define FLIPPER_IMR             0x04
 41 
 42 #define FLIPPER_RESET           0x24
 43 
 44 
 45 /*
 46  * IRQ chip hooks.
 47  *
 48  */
 49 
 50 static void flipper_pic_mask_and_ack(struct irq_data *d)
 51 {
 52         int irq = irqd_to_hwirq(d);
 53         void __iomem *io_base = irq_data_get_irq_chip_data(d);
 54         u32 mask = 1 << irq;
 55 
 56         clrbits32(io_base + FLIPPER_IMR, mask);
 57         /* this is at least needed for RSW */
 58         out_be32(io_base + FLIPPER_ICR, mask);
 59 }
 60 
 61 static void flipper_pic_ack(struct irq_data *d)
 62 {
 63         int irq = irqd_to_hwirq(d);
 64         void __iomem *io_base = irq_data_get_irq_chip_data(d);
 65 
 66         /* this is at least needed for RSW */
 67         out_be32(io_base + FLIPPER_ICR, 1 << irq);
 68 }
 69 
 70 static void flipper_pic_mask(struct irq_data *d)
 71 {
 72         int irq = irqd_to_hwirq(d);
 73         void __iomem *io_base = irq_data_get_irq_chip_data(d);
 74 
 75         clrbits32(io_base + FLIPPER_IMR, 1 << irq);
 76 }
 77 
 78 static void flipper_pic_unmask(struct irq_data *d)
 79 {
 80         int irq = irqd_to_hwirq(d);
 81         void __iomem *io_base = irq_data_get_irq_chip_data(d);
 82 
 83         setbits32(io_base + FLIPPER_IMR, 1 << irq);
 84 }
 85 
 86 
 87 static struct irq_chip flipper_pic = {
 88         .name           = "flipper-pic",
 89         .irq_ack        = flipper_pic_ack,
 90         .irq_mask_ack   = flipper_pic_mask_and_ack,
 91         .irq_mask       = flipper_pic_mask,
 92         .irq_unmask     = flipper_pic_unmask,
 93 };
 94 
 95 /*
 96  * IRQ host hooks.
 97  *
 98  */
 99 
100 static struct irq_domain *flipper_irq_host;
101 
102 static int flipper_pic_map(struct irq_domain *h, unsigned int virq,
103                            irq_hw_number_t hwirq)
104 {
105         irq_set_chip_data(virq, h->host_data);
106         irq_set_status_flags(virq, IRQ_LEVEL);
107         irq_set_chip_and_handler(virq, &flipper_pic, handle_level_irq);
108         return 0;
109 }
110 
111 static int flipper_pic_match(struct irq_domain *h, struct device_node *np)
112 {
113         return 1;
114 }
115 
116 
117 static const struct irq_domain_ops flipper_irq_domain_ops = {
118         .map = flipper_pic_map,
119         .match = flipper_pic_match,
120 };
121 
122 /*
123  * Platform hooks.
124  *
125  */
126 
127 static void __flipper_quiesce(void __iomem *io_base)
128 {
129         /* mask and ack all IRQs */
130         out_be32(io_base + FLIPPER_IMR, 0x00000000);
131         out_be32(io_base + FLIPPER_ICR, 0xffffffff);
132 }
133 
134 struct irq_domain * __init flipper_pic_init(struct device_node *np)
135 {
136         struct device_node *pi;
137         struct irq_domain *irq_domain = NULL;
138         struct resource res;
139         void __iomem *io_base;
140         int retval;
141 
142         pi = of_get_parent(np);
143         if (!pi) {
144                 pr_err("no parent found\n");
145                 goto out;
146         }
147         if (!of_device_is_compatible(pi, "nintendo,flipper-pi")) {
148                 pr_err("unexpected parent compatible\n");
149                 goto out;
150         }
151 
152         retval = of_address_to_resource(pi, 0, &res);
153         if (retval) {
154                 pr_err("no io memory range found\n");
155                 goto out;
156         }
157         io_base = ioremap(res.start, resource_size(&res));
158 
159         pr_info("controller at 0x%08x mapped to 0x%p\n", res.start, io_base);
160 
161         __flipper_quiesce(io_base);
162 
163         irq_domain = irq_domain_add_linear(np, FLIPPER_NR_IRQS,
164                                   &flipper_irq_domain_ops, io_base);
165         if (!irq_domain) {
166                 pr_err("failed to allocate irq_domain\n");
167                 return NULL;
168         }
169 
170 out:
171         return irq_domain;
172 }
173 
174 unsigned int flipper_pic_get_irq(void)
175 {
176         void __iomem *io_base = flipper_irq_host->host_data;
177         int irq;
178         u32 irq_status;
179 
180         irq_status = in_be32(io_base + FLIPPER_ICR) &
181                      in_be32(io_base + FLIPPER_IMR);
182         if (irq_status == 0)
183                 return NO_IRQ;  /* no more IRQs pending */
184 
185         irq = __ffs(irq_status);
186         return irq_linear_revmap(flipper_irq_host, irq);
187 }
188 
189 /*
190  * Probe function.
191  *
192  */
193 
194 void __init flipper_pic_probe(void)
195 {
196         struct device_node *np;
197 
198         np = of_find_compatible_node(NULL, NULL, "nintendo,flipper-pic");
199         BUG_ON(!np);
200 
201         flipper_irq_host = flipper_pic_init(np);
202         BUG_ON(!flipper_irq_host);
203 
204         irq_set_default_host(flipper_irq_host);
205 
206         of_node_put(np);
207 }
208 
209 /*
210  * Misc functions related to the flipper chipset.
211  *
212  */
213 
214 /**
215  * flipper_quiesce() - quiesce flipper irq controller
216  *
217  * Mask and ack all interrupt sources.
218  *
219  */
220 void flipper_quiesce(void)
221 {
222         void __iomem *io_base = flipper_irq_host->host_data;
223 
224         __flipper_quiesce(io_base);
225 }
226 
227 /*
228  * Resets the platform.
229  */
230 void flipper_platform_reset(void)
231 {
232         void __iomem *io_base;
233 
234         if (flipper_irq_host && flipper_irq_host->host_data) {
235                 io_base = flipper_irq_host->host_data;
236                 out_8(io_base + FLIPPER_RESET, 0x00);
237         }
238 }
239 
240 /*
241  * Returns non-zero if the reset button is pressed.
242  */
243 int flipper_is_reset_button_pressed(void)
244 {
245         void __iomem *io_base;
246         u32 icr;
247 
248         if (flipper_irq_host && flipper_irq_host->host_data) {
249                 io_base = flipper_irq_host->host_data;
250                 icr = in_be32(io_base + FLIPPER_ICR);
251                 return !(icr & FLIPPER_ICR_RSS);
252         }
253         return 0;
254 }
255 
256 

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