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/* 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];
u_int32_t usbmask;
u_int32_t usb_throttled; /* atomic? */
};
static struct pioirq_state pirqs;
static void pio_irq_demux(void)
{
u_int32_t pio = AT91F_PIO_GetInterruptStatus(AT91C_BASE_PIOA);
u_int8_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;
u_int32_t *regmask;
opcdh = (struct openpcd_hdr *) irq_rctx->data;
regmask = (u_int32_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(u_int32_t);
req_ctx_set_state(irq_rctx, RCTX_STATE_UDP_EP3_PENDING);
}
}
AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_PIOA);
}
void pio_irq_enable(u_int32_t pio)
{
AT91F_PIO_InterruptEnable(AT91C_BASE_PIOA, pio);
}
void pio_irq_disable(u_int32_t pio)
{
AT91F_PIO_InterruptDisable(AT91C_BASE_PIOA, pio);
}
int pio_irq_register(u_int32_t pio, irq_handler_t *handler)
{
u_int8_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;
return 0;
}
void pio_irq_unregister(u_int32_t pio)
{
u_int8_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);
}
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