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/* PIO IRQ Implementation for OpenPCD
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* (C) 2006 by Harald Welte <hwelte@hmw-consulting.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <errno.h>
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#include <sys/types.h>
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#include <lib_AT91SAM7.h>
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#include <os/pio_irq.h>
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#include <os/dbgu.h>
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#include <os/req_ctx.h>
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#include <openpcd.h>
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struct pioirq_state {
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irq_handler_t *handlers[NR_PIO];
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uint32_t usbmask;
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uint32_t usb_throttled; /* atomic? */
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};
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static struct pioirq_state pirqs;
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/* low-level handler, used by Cstartup_app.S PIOA fast forcing and
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* by regular interrupt handler below */
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void __ramfunc __pio_irq_demux(uint32_t pio)
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{
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uint8_t send_usb = 0;
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int i;
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//DEBUGPCRF("PIO_ISR_STATUS = 0x%08x", pio);
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for (i = 0; i < NR_PIO; i++) {
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if (pio & (1 << i) && pirqs.handlers[i])
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pirqs.handlers[i](i);
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if (pirqs.usbmask & (1 << i))
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send_usb = 1;
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}
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if (send_usb && !pirqs.usb_throttled) {
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struct req_ctx *irq_rctx;
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irq_rctx = req_ctx_find_get(0, RCTX_STATE_FREE,
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RCTX_STATE_PIOIRQ_BUSY);
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if (!irq_rctx) {
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/* we cannot disable the interrupt, since we have
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* non-usb listeners */
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pirqs.usb_throttled = 1;
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} else {
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struct openpcd_hdr *opcdh;
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uint32_t *regmask;
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opcdh = (struct openpcd_hdr *) irq_rctx->data;
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regmask = (uint32_t *) (irq_rctx->data + sizeof(*opcdh));
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opcdh->cmd = OPENPCD_CMD_PIO_IRQ;
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opcdh->reg = 0x00;
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opcdh->flags = 0x00;
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opcdh->val = 0x00;
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irq_rctx->tot_len = sizeof(*opcdh) + sizeof(uint32_t);
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req_ctx_set_state(irq_rctx, RCTX_STATE_UDP_EP3_PENDING);
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}
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}
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AT91F_AIC_ClearIt(AT91C_BASE_AIC, AT91C_ID_PIOA);
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}
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/* regular interrupt handler, in case fast forcing for PIOA disabled */
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static void pio_irq_demux(void)
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{
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uint32_t pio = AT91F_PIO_GetInterruptStatus(AT91C_BASE_PIOA);
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__pio_irq_demux(pio);
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}
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void pio_irq_enable(uint32_t pio)
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{
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AT91F_PIO_InterruptEnable(AT91C_BASE_PIOA, pio);
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}
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void pio_irq_disable(uint32_t pio)
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{
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AT91F_PIO_InterruptDisable(AT91C_BASE_PIOA, pio);
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}
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int pio_irq_register(uint32_t pio, irq_handler_t *handler)
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{
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uint8_t num = ffs(pio);
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if (num == 0)
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return -EINVAL;
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num--;
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if (pirqs.handlers[num])
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return -EBUSY;
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pio_irq_disable(pio);
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AT91F_PIO_CfgInput(AT91C_BASE_PIOA, pio);
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pirqs.handlers[num] = handler;
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DEBUGPCRF("registering handler %p for PIOA %u", handler, num);
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return 0;
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}
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void pio_irq_unregister(uint32_t pio)
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{
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uint8_t num = ffs(pio);
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if (num == 0)
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return;
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num--;
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pio_irq_disable(pio);
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pirqs.handlers[num] = NULL;
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}
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static int pio_irq_usb_in(struct req_ctx *rctx)
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{
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struct openpcd_hdr *poh = (struct openpcd_hdr *) rctx->data;
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switch (poh->cmd) {
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case OPENPCD_CMD_PIO_IRQ:
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pirqs.usbmask = poh->val;
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break;
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default:
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DEBUGP("UNKNOWN ");
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return -EINVAL;
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}
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return 0;
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}
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void pio_irq_init(void)
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{
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AT91F_PIOA_CfgPMC();
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AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_PIOA,
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AT91C_AIC_PRIOR_LOWEST,
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AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &pio_irq_demux);
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AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_PIOA);
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}
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