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arm:rs232 fix.

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The kernel API for requesting interrupts and the associated callback
have a somewhat strange behaviour. Requesting an interrupts is done
by calling sys_irqsetpolicy using an interrupt and a given id. This
id can be modified by the sys_irqsetpolicy and must be used for
subsequent calls to sys_irqenable/sys_irqdisable. However upon an
incoming call from the kernel NOTIFY_ARG contains the original value
encoded in a set e.g. if  1 << id == true the interrupt was raised.
This commit is contained in:
Kees Jongenburger 2013-04-10 15:00:42 +02:00
parent aa3db0e0e2
commit 037aeb5a13
1 changed files with 20 additions and 8 deletions
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28
drivers/tty/arch/earm/rs232.c
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@ -108,6 +108,7 @@ typedef struct rs232 {
int irq; /* irq for this line */
int irq_hook_id; /* interrupt hook */
int irq_hook_kernel_id; /* id as returned from sys_irqsetpolicy */
char ibuf[RS_IBUFSIZE]; /* input buffer */
char obuf[RS_OBUFSIZE]; /* output buffer */
@ -428,7 +429,7 @@ static void rs_config(rs232_t *rs)
* avoid looping forever.
*/
if (sys_irqdisable(&rs->irq_hook_id) != OK)
if (sys_irqdisable(&rs->irq_hook_kernel_id) != OK)
panic("unable to disable interrupts");
/* Select the baud rate divisor registers and change the rate. */
@ -456,7 +457,7 @@ static void rs_config(rs232_t *rs)
if ((tp->tty_termios.c_lflag & IXON) && rs->oxoff != _POSIX_VDISABLE)
rs->ostate &= ~ORAW;
(void) serial_in(rs, OMAP3_IIR);
if (sys_irqenable(&rs->irq_hook_id) != OK)
if (sys_irqenable(&rs->irq_hook_kernel_id) != OK)
panic("unable to enable interrupts");
}
@ -519,16 +520,27 @@ rs_init(tty_t *tp)
/* Configure IRQ */
rs->irq = this_omap3.irq;
rs->irq_hook_id = 1 << line; /* call back with irq line number */
if (sys_irqsetpolicy(rs->irq, 0, &rs->irq_hook_id) != OK) {
/* callback with irq line number + 1 because using line number 0
fails eslewhere */
rs->irq_hook_kernel_id = rs->irq_hook_id = line + 1;
/* sys_irqsetpolicy modifies irq_hook_kernel_id. this modified id
* needs to be used in sys_irqenable and similar calls.
*/
if (sys_irqsetpolicy(rs->irq, 0, &rs->irq_hook_kernel_id) != OK) {
printf("RS232: Couldn't obtain hook for irq %d\n", rs->irq);
} else {
if (sys_irqenable(&rs->irq_hook_id) != OK) {
if (sys_irqenable(&rs->irq_hook_kernel_id) != OK) {
printf("RS232: Couldn't enable irq %d (hooked)\n",
rs->irq);
}
}
rs_irq_set |= (1 << (rs->irq_hook_id + 1));
/* When we get called back we get called back using the original
* hook_id bit set. e.g. if we register with hook_id 5 the callback
* calls us with the 5 th bit set */
rs_irq_set |= (1 << (rs->irq_hook_id ));
/* Enable interrupts */
rs_reset(rs);
@ -559,9 +571,9 @@ rs_interrupt(message *m)
irq_set = m->NOTIFY_ARG;
for (line = 0, rs = rs_lines; line < NR_RS_LINES; line++, rs++) {
if (irq_set & (1 << (rs->irq_hook_id+1))) {
if (irq_set & (1 << rs->irq_hook_id)) {
rs232_handler(rs);
if (sys_irqenable(&rs->irq_hook_id) != OK)
if (sys_irqenable(&rs->irq_hook_kernel_id) != OK)
panic("unable to enable interrupts");
}
}