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

TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/cell/beat_interrupt.c

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.5 ] ~ [ linux-5.4.21 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.105 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.171 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.214 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.214 ] ~ [ 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-3.16.82 ] ~ [ 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  * Celleb/Beat Interrupt controller
  3  *
  4  * (C) Copyright 2006-2007 TOSHIBA CORPORATION
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License along
 17  * with this program; if not, write to the Free Software Foundation, Inc.,
 18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 19  */
 20 
 21 #include <linux/init.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/irq.h>
 24 #include <linux/percpu.h>
 25 #include <linux/types.h>
 26 
 27 #include <asm/machdep.h>
 28 
 29 #include "beat_interrupt.h"
 30 #include "beat_wrapper.h"
 31 
 32 #define MAX_IRQS        NR_IRQS
 33 static DEFINE_RAW_SPINLOCK(beatic_irq_mask_lock);
 34 static uint64_t beatic_irq_mask_enable[(MAX_IRQS+255)/64];
 35 static uint64_t beatic_irq_mask_ack[(MAX_IRQS+255)/64];
 36 
 37 static struct irq_domain *beatic_host;
 38 
 39 /*
 40  * In this implementation, "virq" == "IRQ plug number",
 41  * "(irq_hw_number_t)hwirq" == "IRQ outlet number".
 42  */
 43 
 44 /* assumption: locked */
 45 static inline void beatic_update_irq_mask(unsigned int irq_plug)
 46 {
 47         int off;
 48         unsigned long masks[4];
 49 
 50         off = (irq_plug / 256) * 4;
 51         masks[0] = beatic_irq_mask_enable[off + 0]
 52                 & beatic_irq_mask_ack[off + 0];
 53         masks[1] = beatic_irq_mask_enable[off + 1]
 54                 & beatic_irq_mask_ack[off + 1];
 55         masks[2] = beatic_irq_mask_enable[off + 2]
 56                 & beatic_irq_mask_ack[off + 2];
 57         masks[3] = beatic_irq_mask_enable[off + 3]
 58                 & beatic_irq_mask_ack[off + 3];
 59         if (beat_set_interrupt_mask(irq_plug&~255UL,
 60                 masks[0], masks[1], masks[2], masks[3]) != 0)
 61                 panic("Failed to set mask IRQ!");
 62 }
 63 
 64 static void beatic_mask_irq(struct irq_data *d)
 65 {
 66         unsigned long flags;
 67 
 68         raw_spin_lock_irqsave(&beatic_irq_mask_lock, flags);
 69         beatic_irq_mask_enable[d->irq/64] &= ~(1UL << (63 - (d->irq%64)));
 70         beatic_update_irq_mask(d->irq);
 71         raw_spin_unlock_irqrestore(&beatic_irq_mask_lock, flags);
 72 }
 73 
 74 static void beatic_unmask_irq(struct irq_data *d)
 75 {
 76         unsigned long flags;
 77 
 78         raw_spin_lock_irqsave(&beatic_irq_mask_lock, flags);
 79         beatic_irq_mask_enable[d->irq/64] |= 1UL << (63 - (d->irq%64));
 80         beatic_update_irq_mask(d->irq);
 81         raw_spin_unlock_irqrestore(&beatic_irq_mask_lock, flags);
 82 }
 83 
 84 static void beatic_ack_irq(struct irq_data *d)
 85 {
 86         unsigned long flags;
 87 
 88         raw_spin_lock_irqsave(&beatic_irq_mask_lock, flags);
 89         beatic_irq_mask_ack[d->irq/64] &= ~(1UL << (63 - (d->irq%64)));
 90         beatic_update_irq_mask(d->irq);
 91         raw_spin_unlock_irqrestore(&beatic_irq_mask_lock, flags);
 92 }
 93 
 94 static void beatic_end_irq(struct irq_data *d)
 95 {
 96         s64 err;
 97         unsigned long flags;
 98 
 99         err = beat_downcount_of_interrupt(d->irq);
100         if (err != 0) {
101                 if ((err & 0xFFFFFFFF) != 0xFFFFFFF5) /* -11: wrong state */
102                         panic("Failed to downcount IRQ! Error = %16llx", err);
103 
104                 printk(KERN_ERR "IRQ over-downcounted, plug %d\n", d->irq);
105         }
106         raw_spin_lock_irqsave(&beatic_irq_mask_lock, flags);
107         beatic_irq_mask_ack[d->irq/64] |= 1UL << (63 - (d->irq%64));
108         beatic_update_irq_mask(d->irq);
109         raw_spin_unlock_irqrestore(&beatic_irq_mask_lock, flags);
110 }
111 
112 static struct irq_chip beatic_pic = {
113         .name = "CELL-BEAT",
114         .irq_unmask = beatic_unmask_irq,
115         .irq_mask = beatic_mask_irq,
116         .irq_eoi = beatic_end_irq,
117 };
118 
119 /*
120  * Dispose binding hardware IRQ number (hw) and Virtuql IRQ number (virq),
121  * update flags.
122  *
123  * Note that the number (virq) is already assigned at upper layer.
124  */
125 static void beatic_pic_host_unmap(struct irq_domain *h, unsigned int virq)
126 {
127         beat_destruct_irq_plug(virq);
128 }
129 
130 /*
131  * Create or update binding hardware IRQ number (hw) and Virtuql
132  * IRQ number (virq). This is called only once for a given mapping.
133  *
134  * Note that the number (virq) is already assigned at upper layer.
135  */
136 static int beatic_pic_host_map(struct irq_domain *h, unsigned int virq,
137                                irq_hw_number_t hw)
138 {
139         int64_t err;
140 
141         err = beat_construct_and_connect_irq_plug(virq, hw);
142         if (err < 0)
143                 return -EIO;
144 
145         irq_set_status_flags(virq, IRQ_LEVEL);
146         irq_set_chip_and_handler(virq, &beatic_pic, handle_fasteoi_irq);
147         return 0;
148 }
149 
150 /*
151  * Translate device-tree interrupt spec to irq_hw_number_t style (ulong),
152  * to pass away to irq_create_mapping().
153  *
154  * Called from irq_create_of_mapping() only.
155  * Note: We have only 1 entry to translate.
156  */
157 static int beatic_pic_host_xlate(struct irq_domain *h, struct device_node *ct,
158                                  const u32 *intspec, unsigned int intsize,
159                                  irq_hw_number_t *out_hwirq,
160                                  unsigned int *out_flags)
161 {
162         const u64 *intspec2 = (const u64 *)intspec;
163 
164         *out_hwirq = *intspec2;
165         *out_flags |= IRQ_TYPE_LEVEL_LOW;
166         return 0;
167 }
168 
169 static int beatic_pic_host_match(struct irq_domain *h, struct device_node *np)
170 {
171         /* Match all */
172         return 1;
173 }
174 
175 static const struct irq_domain_ops beatic_pic_host_ops = {
176         .map = beatic_pic_host_map,
177         .unmap = beatic_pic_host_unmap,
178         .xlate = beatic_pic_host_xlate,
179         .match = beatic_pic_host_match,
180 };
181 
182 /*
183  * Get an IRQ number
184  * Note: returns VIRQ
185  */
186 static inline unsigned int beatic_get_irq_plug(void)
187 {
188         int i;
189         uint64_t        pending[4], ub;
190 
191         for (i = 0; i < MAX_IRQS; i += 256) {
192                 beat_detect_pending_interrupts(i, pending);
193                 __asm__ ("cntlzd %0,%1":"=r"(ub):
194                         "r"(pending[0] & beatic_irq_mask_enable[i/64+0]
195                                        & beatic_irq_mask_ack[i/64+0]));
196                 if (ub != 64)
197                         return i + ub + 0;
198                 __asm__ ("cntlzd %0,%1":"=r"(ub):
199                         "r"(pending[1] & beatic_irq_mask_enable[i/64+1]
200                                        & beatic_irq_mask_ack[i/64+1]));
201                 if (ub != 64)
202                         return i + ub + 64;
203                 __asm__ ("cntlzd %0,%1":"=r"(ub):
204                         "r"(pending[2] & beatic_irq_mask_enable[i/64+2]
205                                        & beatic_irq_mask_ack[i/64+2]));
206                 if (ub != 64)
207                         return i + ub + 128;
208                 __asm__ ("cntlzd %0,%1":"=r"(ub):
209                         "r"(pending[3] & beatic_irq_mask_enable[i/64+3]
210                                        & beatic_irq_mask_ack[i/64+3]));
211                 if (ub != 64)
212                         return i + ub + 192;
213         }
214 
215         return NO_IRQ;
216 }
217 unsigned int beatic_get_irq(void)
218 {
219         unsigned int ret;
220 
221         ret = beatic_get_irq_plug();
222         if (ret != NO_IRQ)
223                 beatic_ack_irq(irq_get_irq_data(ret));
224         return ret;
225 }
226 
227 /*
228  */
229 void __init beatic_init_IRQ(void)
230 {
231         int     i;
232 
233         memset(beatic_irq_mask_enable, 0, sizeof(beatic_irq_mask_enable));
234         memset(beatic_irq_mask_ack, 255, sizeof(beatic_irq_mask_ack));
235         for (i = 0; i < MAX_IRQS; i += 256)
236                 beat_set_interrupt_mask(i, 0L, 0L, 0L, 0L);
237 
238         /* Set out get_irq function */
239         ppc_md.get_irq = beatic_get_irq;
240 
241         /* Allocate an irq host */
242         beatic_host = irq_domain_add_nomap(NULL, 0, &beatic_pic_host_ops, NULL);
243         BUG_ON(beatic_host == NULL);
244         irq_set_default_host(beatic_host);
245 }
246 
247 void beatic_deinit_IRQ(void)
248 {
249         int     i;
250 
251         for (i = 1; i < nr_irqs; i++)
252                 beat_destruct_irq_plug(i);
253 }
254 

~ [ 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