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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                              enum irq_domain_bus_token bus_token)
113 {
114         return 1;
115 }
116 
117 
118 static const struct irq_domain_ops flipper_irq_domain_ops = {
119         .map = flipper_pic_map,
120         .match = flipper_pic_match,
121 };
122 
123 /*
124  * Platform hooks.
125  *
126  */
127 
128 static void __flipper_quiesce(void __iomem *io_base)
129 {
130         /* mask and ack all IRQs */
131         out_be32(io_base + FLIPPER_IMR, 0x00000000);
132         out_be32(io_base + FLIPPER_ICR, 0xffffffff);
133 }
134 
135 struct irq_domain * __init flipper_pic_init(struct device_node *np)
136 {
137         struct device_node *pi;
138         struct irq_domain *irq_domain = NULL;
139         struct resource res;
140         void __iomem *io_base;
141         int retval;
142 
143         pi = of_get_parent(np);
144         if (!pi) {
145                 pr_err("no parent found\n");
146                 goto out;
147         }
148         if (!of_device_is_compatible(pi, "nintendo,flipper-pi")) {
149                 pr_err("unexpected parent compatible\n");
150                 goto out;
151         }
152 
153         retval = of_address_to_resource(pi, 0, &res);
154         if (retval) {
155                 pr_err("no io memory range found\n");
156                 goto out;
157         }
158         io_base = ioremap(res.start, resource_size(&res));
159 
160         pr_info("controller at 0x%08x mapped to 0x%p\n", res.start, io_base);
161 
162         __flipper_quiesce(io_base);
163 
164         irq_domain = irq_domain_add_linear(np, FLIPPER_NR_IRQS,
165                                   &flipper_irq_domain_ops, io_base);
166         if (!irq_domain) {
167                 pr_err("failed to allocate irq_domain\n");
168                 return NULL;
169         }
170 
171 out:
172         return irq_domain;
173 }
174 
175 unsigned int flipper_pic_get_irq(void)
176 {
177         void __iomem *io_base = flipper_irq_host->host_data;
178         int irq;
179         u32 irq_status;
180 
181         irq_status = in_be32(io_base + FLIPPER_ICR) &
182                      in_be32(io_base + FLIPPER_IMR);
183         if (irq_status == 0)
184                 return NO_IRQ;  /* no more IRQs pending */
185 
186         irq = __ffs(irq_status);
187         return irq_linear_revmap(flipper_irq_host, irq);
188 }
189 
190 /*
191  * Probe function.
192  *
193  */
194 
195 void __init flipper_pic_probe(void)
196 {
197         struct device_node *np;
198 
199         np = of_find_compatible_node(NULL, NULL, "nintendo,flipper-pic");
200         BUG_ON(!np);
201 
202         flipper_irq_host = flipper_pic_init(np);
203         BUG_ON(!flipper_irq_host);
204 
205         irq_set_default_host(flipper_irq_host);
206 
207         of_node_put(np);
208 }
209 
210 /*
211  * Misc functions related to the flipper chipset.
212  *
213  */
214 
215 /**
216  * flipper_quiesce() - quiesce flipper irq controller
217  *
218  * Mask and ack all interrupt sources.
219  *
220  */
221 void flipper_quiesce(void)
222 {
223         void __iomem *io_base = flipper_irq_host->host_data;
224 
225         __flipper_quiesce(io_base);
226 }
227 
228 /*
229  * Resets the platform.
230  */
231 void flipper_platform_reset(void)
232 {
233         void __iomem *io_base;
234 
235         if (flipper_irq_host && flipper_irq_host->host_data) {
236                 io_base = flipper_irq_host->host_data;
237                 out_8(io_base + FLIPPER_RESET, 0x00);
238         }
239 }
240 
241 /*
242  * Returns non-zero if the reset button is pressed.
243  */
244 int flipper_is_reset_button_pressed(void)
245 {
246         void __iomem *io_base;
247         u32 icr;
248 
249         if (flipper_irq_host && flipper_irq_host->host_data) {
250                 io_base = flipper_irq_host->host_data;
251                 icr = in_be32(io_base + FLIPPER_ICR);
252                 return !(icr & FLIPPER_ICR_RSS);
253         }
254         return 0;
255 }
256 
257 

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