1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/* PIO IRQ Implementation for OpenPCD
* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <errno.h>
#include <sys/types.h>
#include <lib_AT91SAM7.h>
#include <os/pio_irq.h>
#include <os/dbgu.h>
#include <os/req_ctx.h>
#include <openpcd.h>
struct pioirq_state {
irq_handler_t *handlers[NR_PIO];
uint32_t usbmask;
uint32_t usb_throttled; /* atomic? */
};
static struct pioirq_state pirqs;
/* low-level handler, used by Cstartup_app.S PIOA fast forcing and
* by regular interrupt handler below */
void __ramfunc __pio_irq_demux(uint32_t pio)
{
uint8_t send_usb = 0;
int i;
//DEBUGPCRF("PIO_ISR_STATUS = 0x%08x", pio);
for (i = 0; i < NR_PIO; i++) {
if (pio & (1 << i) && pirqs.handlers[i])
pirqs.handlers[i](i);
if (pirqs.usbmask & (1 << i))
send_usb = 1;
}
if (send_usb && !pirqs.usb_throttled) {
struct req_ctx *irq_rctx;
irq_rctx = req_ctx_find_get(0, RCTX_STATE_FREE,
RCTX_STATE_PIOIRQ_BUSY);
if (!irq_rctx) {
/* we cannot disable the interrupt, since we have
* non-usb listeners */
pirqs.usb_throttled = 1;
} else {
struct openpcd_hdr *opcdh;
uint32_t *regmask;
opcdh = (struct openpcd_hdr *) irq_rctx->data;
regmask = (uint32_t *) (irq_rctx->data + sizeof(*opcdh));
opcdh->cmd = OPENPCD_CMD_PIO_IRQ;
opcdh->reg = 0x00;
opcdh->flags = 0x00;
opcdh->val = 0x00;
irq_rctx->tot_len = sizeof(*opcdh) + sizeof(uint32_t);
req_ctx_set_state(irq_rctx, RCTX_STATE_UDP_EP3_PENDING);
}
}
AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_PIOA);
}
/* regular interrupt handler, in case fast forcing for PIOA disabled */
static void pio_irq_demux(void)
{
uint32_t pio = AT91F_PIO_GetInterruptStatus(AT91C_BASE_PIOA);
__pio_irq_demux(pio);
}
void pio_irq_enable(uint32_t pio)
{
AT91F_PIO_InterruptEnable(AT91C_BASE_PIOA, pio);
}
void pio_irq_disable(uint32_t pio)
{
AT91F_PIO_InterruptDisable(AT91C_BASE_PIOA, pio);
}
int pio_irq_register(uint32_t pio, irq_handler_t *handler)
{
uint8_t num = ffs(pio);
if (num == 0)
return -EINVAL;
num--;
if (pirqs.handlers[num])
return -EBUSY;
pio_irq_disable(pio);
AT91F_PIO_CfgInput(AT91C_BASE_PIOA, pio);
pirqs.handlers[num] = handler;
DEBUGPCRF("registering handler %p for PIOA %u", handler, num);
return 0;
}
void pio_irq_unregister(uint32_t pio)
{
uint8_t num = ffs(pio);
if (num == 0)
return;
num--;
pio_irq_disable(pio);
pirqs.handlers[num] = NULL;
}
static int pio_irq_usb_in(struct req_ctx *rctx)
{
struct openpcd_hdr *poh = (struct openpcd_hdr *) rctx->data;
switch (poh->cmd) {
case OPENPCD_CMD_PIO_IRQ:
pirqs.usbmask = poh->val;
break;
default:
DEBUGP("UNKNOWN ");
return -EINVAL;
}
return 0;
}
void pio_irq_init(void)
{
AT91F_PIOA_CfgPMC();
AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_PIOA,
AT91C_AIC_PRIOR_LOWEST,
AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &pio_irq_demux);
AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_PIOA);
}
|
