cris build fixes: corrected and improved NMI and IRQ handling

Corrects compile errors and the following:

- Remove oldset parameter from do_signal and do_notify_resume.

- Modified to fit new consolidated IRQ handling code.

- Reverse check order between external nmi and watchdog nmi to avoid false
  watchdog oops in case of a glitch on the nmi pin.

- Return from an pin-generated NMI the same way as for other interrupts.

- Moved blocking of ethernet rx/tx irq from ethernet interrupt handler to
  low-level asm interrupt handlers.  Fixed in the multiple interrupt
  handler also.

- Add space for thread local storage in thread_info struct.

- Add NO_DMA to Kconfig, and include arch specific Kconfig using arch
  independent path. Include subsystem Kconfigs for pcmcia, usb, i2c,
  rtc and pci.

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 78 insertions, 23 deletions

diff --git a/arch/cris/arch-v10/drivers/Kconfig b/arch/cris/arch-v10/drivers/Kconfig
index 03e2e68f947d..e6fc8455a372 100644
--- a/arch/cris/arch-v10/drivers/Kconfig
+++ b/arch/cris/arch-v10/drivers/Kconfig
@@ -2,6 +2,7 @@ config ETRAX_ETHERNET
         bool "Ethernet support"
         depends on ETRAX_ARCH_V10
         select NET_ETHERNET
+        select MII
         help
           This option enables the ETRAX 100LX built-in 10/100Mbit Ethernet
           controller.
diff --git a/arch/cris/arch-v10/kernel/entry.S b/arch/cris/arch-v10/kernel/entry.S
index bc9bed97f225..ec62c951fa3c 100644
--- a/arch/cris/arch-v10/kernel/entry.S
+++ b/arch/cris/arch-v10/kernel/entry.S
@@ -500,9 +500,8 @@ _work_notifysig:
         ;; deal with pending signals and notify-resume requests
 
         move.d  $r9, $r10       ; do_notify_resume syscall/irq param
-        moveq   0, $r11         ; oldset param - 0 in this case
-        move.d  $sp, $r12       ; the regs param
-        move.d  $r1, $r13       ; the thread_info_flags parameter
+        move.d  $sp, $r11       ; the regs param
+        move.d  $r1, $r12       ; the thread_info_flags parameter
         jsr     do_notify_resume
         
         ba _Rexit
@@ -678,13 +677,19 @@ IRQ1_interrupt:
         push    $r10            ; push orig_r10
         clear.d [$sp=$sp-4]     ; frametype == 0, normal frame
 
+        ;; If there is a glitch on the NMI pin shorter than ~100ns
+        ;; (i.e. non-active by the time we get here) then the nmi_pin bit
+        ;; in R_IRQ_MASK0_RD will already be cleared.  The watchdog_nmi bit
+        ;; is cleared by us however (when feeding the watchdog), which is why
+        ;; we use that bit to determine what brought us here.
+
         move.d  [R_IRQ_MASK0_RD], $r1 ; External NMI or watchdog?
-        and.d   0x80000000, $r1
-        beq     wdog
+        and.d   (1<<30), $r1
+        bne     wdog
         move.d  $sp, $r10
         jsr     handle_nmi
         setf m                  ; Enable NMI again
-        retb                    ; Return from NMI
+        ba      _Rexit          ; Return the standard way
         nop
 wdog:
 #if defined(CONFIG_ETRAX_WATCHDOG) && !defined(CONFIG_SVINTO_SIM)
@@ -775,22 +780,9 @@ multiple_interrupt:
         push    $r10            ; push orig_r10
         clear.d [$sp=$sp-4]     ; frametype == 0, normal frame
         
-        moveq   2, $r2          ; first bit we care about is the timer0 irq
-        move.d  [R_VECT_MASK_RD], $r0; read the irq bits that triggered the multiple irq
-        move.d  $r0, [R_VECT_MASK_CLR] ; Block all active IRQs
-1:      
-        btst    $r2, $r0        ; check for the irq given by bit r2
-        bpl     2f
-        move.d  $r2, $r10       ; First argument to do_IRQ
-        move.d  $sp, $r11       ; second argument to do_IRQ
-        jsr     do_IRQ
-2:
-        addq    1, $r2          ; next vector bit
-        cmp.b   32, $r2
-        bne     1b      ; process all irq's up to and including number 31
-        moveq   0, $r9  ; make ret_from_intr realise we came from an ir
+        move.d  $sp, $r10
+        jsr     do_multiple_IRQ
         
-        move.d  $r0, [R_VECT_MASK_SET] ;  Unblock all the IRQs
         jump    ret_from_intr
 
 do_sigtrap:
@@ -837,6 +829,13 @@ _ugdb_handle_breakpoint:
         ba      do_sigtrap              ; SIGTRAP the offending process. 
         pop     $dccr                   ; Restore dccr in delay slot.
         
+        .global kernel_execve
+kernel_execve:
+        move.d __NR_execve, $r9
+        break 13
+        ret
+        nop
+
         .data
 
 hw_bp_trigs:
diff --git a/arch/cris/arch-v10/kernel/irq.c b/arch/cris/arch-v10/kernel/irq.c
index 845c95f6e871..e06ab0050d37 100644
--- a/arch/cris/arch-v10/kernel/irq.c
+++ b/arch/cris/arch-v10/kernel/irq.c
@@ -12,10 +12,16 @@
  */
 
 #include <asm/irq.h>
+#include <asm/current.h>
 #include <linux/irq.h>
+#include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 
+/* From kgdb.c. */
+extern void kgdb_init(void);
+extern void breakpoint(void);
+
 #define mask_irq(irq_nr) (*R_VECT_MASK_CLR = 1 << (irq_nr));
 #define unmask_irq(irq_nr) (*R_VECT_MASK_SET = 1 << (irq_nr));
 
@@ -75,8 +81,8 @@ BUILD_IRQ(12, 0x1000)
 BUILD_IRQ(13, 0x2000)
 void mmu_bus_fault(void);      /* IRQ 14 is the bus fault interrupt */
 void multiple_interrupt(void); /* IRQ 15 is the multiple IRQ interrupt */
-BUILD_IRQ(16, 0x10000)
-BUILD_IRQ(17, 0x20000)
+BUILD_IRQ(16, 0x10000 | 0x20000)  /* ethernet tx interrupt needs to block rx */
+BUILD_IRQ(17, 0x20000 | 0x10000)  /* ...and vice versa */
 BUILD_IRQ(18, 0x40000)
 BUILD_IRQ(19, 0x80000)
 BUILD_IRQ(20, 0x100000)
@@ -147,6 +153,55 @@ void system_call(void);  /* from entry.S */
 void do_sigtrap(void); /* from entry.S */
 void gdb_handle_breakpoint(void); /* from entry.S */
 
+extern void do_IRQ(int irq, struct pt_regs * regs);
+
+/* Handle multiple IRQs */
+void do_multiple_IRQ(struct pt_regs* regs)
+{
+        int bit;
+        unsigned masked;
+        unsigned mask;
+        unsigned ethmask = 0;
+
+        /* Get interrupts to mask and handle */
+        mask = masked = *R_VECT_MASK_RD;
+
+        /* Never mask timer IRQ */
+        mask &= ~(IO_MASK(R_VECT_MASK_RD, timer0));
+
+        /*
+         * If either ethernet interrupt (rx or tx) is active then block
+         * the other one too. Unblock afterwards also.
+         */
+        if (mask &
+            (IO_STATE(R_VECT_MASK_RD, dma0, active) |
+             IO_STATE(R_VECT_MASK_RD, dma1, active))) {
+                ethmask = (IO_MASK(R_VECT_MASK_RD, dma0) |
+                           IO_MASK(R_VECT_MASK_RD, dma1));
+        }
+
+        /* Block them */
+        *R_VECT_MASK_CLR = (mask | ethmask);
+
+        /* An extra irq_enter here to prevent softIRQs to run after
+         * each do_IRQ. This will decrease the interrupt latency.
+         */
+        irq_enter();
+
+        /* Handle all IRQs */
+        for (bit = 2; bit < 32; bit++) {
+                if (masked & (1 << bit)) {
+                        do_IRQ(bit, regs);
+                }
+        }
+
+        /* This irq_exit() will trigger the soft IRQs. */
+        irq_exit();
+
+        /* Unblock the IRQs again */
+        *R_VECT_MASK_SET = (masked | ethmask);
+}
+
 /* init_IRQ() is called by start_kernel and is responsible for fixing IRQ masks and
    setting the irq vector table.
 */