~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/embedded6xx/hlwd-pic.c

Version: ~ [ linux-5.5 ] ~ [ linux-5.4.15 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.98 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.167 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.211 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.211 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * arch/powerpc/platforms/embedded6xx/hlwd-pic.c
  3  *
  4  * Nintendo Wii "Hollywood" interrupt controller support.
  5  * Copyright (C) 2009 The GameCube Linux Team
  6  * Copyright (C) 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 "hlwd-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 <asm/io.h>
 22 
 23 #include "hlwd-pic.h"
 24 
 25 #define HLWD_NR_IRQS    32
 26 
 27 /*
 28  * Each interrupt has a corresponding bit in both
 29  * the Interrupt Cause (ICR) and Interrupt Mask (IMR) registers.
 30  *
 31  * Enabling/disabling an interrupt line involves asserting/clearing
 32  * the corresponding bit in IMR. ACK'ing a request simply involves
 33  * asserting the corresponding bit in ICR.
 34  */
 35 #define HW_BROADWAY_ICR         0x00
 36 #define HW_BROADWAY_IMR         0x04
 37 
 38 
 39 /*
 40  * IRQ chip hooks.
 41  *
 42  */
 43 
 44 static void hlwd_pic_mask_and_ack(struct irq_data *d)
 45 {
 46         int irq = irqd_to_hwirq(d);
 47         void __iomem *io_base = irq_data_get_irq_chip_data(d);
 48         u32 mask = 1 << irq;
 49 
 50         clrbits32(io_base + HW_BROADWAY_IMR, mask);
 51         out_be32(io_base + HW_BROADWAY_ICR, mask);
 52 }
 53 
 54 static void hlwd_pic_ack(struct irq_data *d)
 55 {
 56         int irq = irqd_to_hwirq(d);
 57         void __iomem *io_base = irq_data_get_irq_chip_data(d);
 58 
 59         out_be32(io_base + HW_BROADWAY_ICR, 1 << irq);
 60 }
 61 
 62 static void hlwd_pic_mask(struct irq_data *d)
 63 {
 64         int irq = irqd_to_hwirq(d);
 65         void __iomem *io_base = irq_data_get_irq_chip_data(d);
 66 
 67         clrbits32(io_base + HW_BROADWAY_IMR, 1 << irq);
 68 }
 69 
 70 static void hlwd_pic_unmask(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         setbits32(io_base + HW_BROADWAY_IMR, 1 << irq);
 76 }
 77 
 78 
 79 static struct irq_chip hlwd_pic = {
 80         .name           = "hlwd-pic",
 81         .irq_ack        = hlwd_pic_ack,
 82         .irq_mask_ack   = hlwd_pic_mask_and_ack,
 83         .irq_mask       = hlwd_pic_mask,
 84         .irq_unmask     = hlwd_pic_unmask,
 85 };
 86 
 87 /*
 88  * IRQ host hooks.
 89  *
 90  */
 91 
 92 static struct irq_domain *hlwd_irq_host;
 93 
 94 static int hlwd_pic_map(struct irq_domain *h, unsigned int virq,
 95                            irq_hw_number_t hwirq)
 96 {
 97         irq_set_chip_data(virq, h->host_data);
 98         irq_set_status_flags(virq, IRQ_LEVEL);
 99         irq_set_chip_and_handler(virq, &hlwd_pic, handle_level_irq);
100         return 0;
101 }
102 
103 static const struct irq_domain_ops hlwd_irq_domain_ops = {
104         .map = hlwd_pic_map,
105 };
106 
107 static unsigned int __hlwd_pic_get_irq(struct irq_domain *h)
108 {
109         void __iomem *io_base = h->host_data;
110         int irq;
111         u32 irq_status;
112 
113         irq_status = in_be32(io_base + HW_BROADWAY_ICR) &
114                      in_be32(io_base + HW_BROADWAY_IMR);
115         if (irq_status == 0)
116                 return NO_IRQ;  /* no more IRQs pending */
117 
118         irq = __ffs(irq_status);
119         return irq_linear_revmap(h, irq);
120 }
121 
122 static void hlwd_pic_irq_cascade(unsigned int cascade_virq,
123                                       struct irq_desc *desc)
124 {
125         struct irq_chip *chip = irq_desc_get_chip(desc);
126         struct irq_domain *irq_domain = irq_get_handler_data(cascade_virq);
127         unsigned int virq;
128 
129         raw_spin_lock(&desc->lock);
130         chip->irq_mask(&desc->irq_data); /* IRQ_LEVEL */
131         raw_spin_unlock(&desc->lock);
132 
133         virq = __hlwd_pic_get_irq(irq_domain);
134         if (virq != NO_IRQ)
135                 generic_handle_irq(virq);
136         else
137                 pr_err("spurious interrupt!\n");
138 
139         raw_spin_lock(&desc->lock);
140         chip->irq_ack(&desc->irq_data); /* IRQ_LEVEL */
141         if (!irqd_irq_disabled(&desc->irq_data) && chip->irq_unmask)
142                 chip->irq_unmask(&desc->irq_data);
143         raw_spin_unlock(&desc->lock);
144 }
145 
146 /*
147  * Platform hooks.
148  *
149  */
150 
151 static void __hlwd_quiesce(void __iomem *io_base)
152 {
153         /* mask and ack all IRQs */
154         out_be32(io_base + HW_BROADWAY_IMR, 0);
155         out_be32(io_base + HW_BROADWAY_ICR, 0xffffffff);
156 }
157 
158 struct irq_domain *hlwd_pic_init(struct device_node *np)
159 {
160         struct irq_domain *irq_domain;
161         struct resource res;
162         void __iomem *io_base;
163         int retval;
164 
165         retval = of_address_to_resource(np, 0, &res);
166         if (retval) {
167                 pr_err("no io memory range found\n");
168                 return NULL;
169         }
170         io_base = ioremap(res.start, resource_size(&res));
171         if (!io_base) {
172                 pr_err("ioremap failed\n");
173                 return NULL;
174         }
175 
176         pr_info("controller at 0x%08x mapped to 0x%p\n", res.start, io_base);
177 
178         __hlwd_quiesce(io_base);
179 
180         irq_domain = irq_domain_add_linear(np, HLWD_NR_IRQS,
181                                            &hlwd_irq_domain_ops, io_base);
182         if (!irq_domain) {
183                 pr_err("failed to allocate irq_domain\n");
184                 return NULL;
185         }
186 
187         return irq_domain;
188 }
189 
190 unsigned int hlwd_pic_get_irq(void)
191 {
192         return __hlwd_pic_get_irq(hlwd_irq_host);
193 }
194 
195 /*
196  * Probe function.
197  *
198  */
199 
200 void hlwd_pic_probe(void)
201 {
202         struct irq_domain *host;
203         struct device_node *np;
204         const u32 *interrupts;
205         int cascade_virq;
206 
207         for_each_compatible_node(np, NULL, "nintendo,hollywood-pic") {
208                 interrupts = of_get_property(np, "interrupts", NULL);
209                 if (interrupts) {
210                         host = hlwd_pic_init(np);
211                         BUG_ON(!host);
212                         cascade_virq = irq_of_parse_and_map(np, 0);
213                         irq_set_handler_data(cascade_virq, host);
214                         irq_set_chained_handler(cascade_virq,
215                                                 hlwd_pic_irq_cascade);
216                         hlwd_irq_host = host;
217                         break;
218                 }
219         }
220 }
221 
222 /**
223  * hlwd_quiesce() - quiesce hollywood irq controller
224  *
225  * Mask and ack all interrupt sources.
226  *
227  */
228 void hlwd_quiesce(void)
229 {
230         void __iomem *io_base = hlwd_irq_host->host_data;
231 
232         __hlwd_quiesce(io_base);
233 }
234 
235 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp