1 files changed, 584 insertions, 0 deletions

diff --git a/arch/mips/tx4927/common/tx4927_irq.c b/arch/mips/tx4927/common/tx4927_irq.c
new file mode 100644
index 000000000000..5ab2e2b76018
--- /dev/null
+++ b/arch/mips/tx4927/common/tx4927_irq.c
@@ -0,0 +1,584 @@
+/*
+ * Common tx4927 irq handler
+ *
+ * Author: MontaVista Software, Inc.
+ *         source@mvista.com
+ *
+ *  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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  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.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/kernel_stat.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/timex.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/irq.h>
+#include <linux/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/tx4927/tx4927.h>
+
+/*
+ * DEBUG
+ */
+
+#undef TX4927_IRQ_DEBUG
+
+#ifdef TX4927_IRQ_DEBUG
+#define TX4927_IRQ_NONE        0x00000000
+
+#define TX4927_IRQ_INFO        ( 1 <<  0 )
+#define TX4927_IRQ_WARN        ( 1 <<  1 )
+#define TX4927_IRQ_EROR        ( 1 <<  2 )
+
+#define TX4927_IRQ_INIT        ( 1 <<  5 )
+#define TX4927_IRQ_NEST1       ( 1 <<  6 )
+#define TX4927_IRQ_NEST2       ( 1 <<  7 )
+#define TX4927_IRQ_NEST3       ( 1 <<  8 )
+#define TX4927_IRQ_NEST4       ( 1 <<  9 )
+
+#define TX4927_IRQ_CP0_INIT     ( 1 << 10 )
+#define TX4927_IRQ_CP0_STARTUP  ( 1 << 11 )
+#define TX4927_IRQ_CP0_SHUTDOWN ( 1 << 12 )
+#define TX4927_IRQ_CP0_ENABLE   ( 1 << 13 )
+#define TX4927_IRQ_CP0_DISABLE  ( 1 << 14 )
+#define TX4927_IRQ_CP0_MASK     ( 1 << 15 )
+#define TX4927_IRQ_CP0_ENDIRQ   ( 1 << 16 )
+
+#define TX4927_IRQ_PIC_INIT     ( 1 << 20 )
+#define TX4927_IRQ_PIC_STARTUP  ( 1 << 21 )
+#define TX4927_IRQ_PIC_SHUTDOWN ( 1 << 22 )
+#define TX4927_IRQ_PIC_ENABLE   ( 1 << 23 )
+#define TX4927_IRQ_PIC_DISABLE  ( 1 << 24 )
+#define TX4927_IRQ_PIC_MASK     ( 1 << 25 )
+#define TX4927_IRQ_PIC_ENDIRQ   ( 1 << 26 )
+
+#define TX4927_IRQ_ALL         0xffffffff
+#endif
+
+#ifdef TX4927_IRQ_DEBUG
+static const u32 tx4927_irq_debug_flag = (TX4927_IRQ_NONE
+                                          | TX4927_IRQ_INFO
+                                          | TX4927_IRQ_WARN | TX4927_IRQ_EROR
+//                                       | TX4927_IRQ_CP0_INIT
+//                                       | TX4927_IRQ_CP0_STARTUP
+//                                       | TX4927_IRQ_CP0_SHUTDOWN
+//                                       | TX4927_IRQ_CP0_ENABLE
+//                                       | TX4927_IRQ_CP0_DISABLE
+//                                       | TX4927_IRQ_CP0_MASK
+//                                       | TX4927_IRQ_CP0_ENDIRQ
+//                                       | TX4927_IRQ_PIC_INIT
+//                                       | TX4927_IRQ_PIC_STARTUP
+//                                       | TX4927_IRQ_PIC_SHUTDOWN
+//                                       | TX4927_IRQ_PIC_ENABLE
+//                                       | TX4927_IRQ_PIC_DISABLE
+//                                       | TX4927_IRQ_PIC_MASK
+//                                       | TX4927_IRQ_PIC_ENDIRQ
+//                                       | TX4927_IRQ_INIT
+//                                       | TX4927_IRQ_NEST1
+//                                       | TX4927_IRQ_NEST2
+//                                       | TX4927_IRQ_NEST3
+//                                       | TX4927_IRQ_NEST4
+    );
+#endif
+
+#ifdef TX4927_IRQ_DEBUG
+#define TX4927_IRQ_DPRINTK(flag,str...) \
+        if ( (tx4927_irq_debug_flag) & (flag) ) \
+        { \
+           char tmp[100]; \
+           sprintf( tmp, str ); \
+           printk( "%s(%s:%u)::%s", __FUNCTION__, __FILE__, __LINE__, tmp ); \
+        }
+#else
+#define TX4927_IRQ_DPRINTK(flag,str...)
+#endif
+
+/*
+ * Forwad definitions for all pic's
+ */
+
+static unsigned int tx4927_irq_cp0_startup(unsigned int irq);
+static void tx4927_irq_cp0_shutdown(unsigned int irq);
+static void tx4927_irq_cp0_enable(unsigned int irq);
+static void tx4927_irq_cp0_disable(unsigned int irq);
+static void tx4927_irq_cp0_mask_and_ack(unsigned int irq);
+static void tx4927_irq_cp0_end(unsigned int irq);
+
+static unsigned int tx4927_irq_pic_startup(unsigned int irq);
+static void tx4927_irq_pic_shutdown(unsigned int irq);
+static void tx4927_irq_pic_enable(unsigned int irq);
+static void tx4927_irq_pic_disable(unsigned int irq);
+static void tx4927_irq_pic_mask_and_ack(unsigned int irq);
+static void tx4927_irq_pic_end(unsigned int irq);
+
+/*
+ * Kernel structs for all pic's
+ */
+
+static DEFINE_SPINLOCK(tx4927_cp0_lock);
+static DEFINE_SPINLOCK(tx4927_pic_lock);
+
+#define TX4927_CP0_NAME "TX4927-CP0"
+static struct hw_interrupt_type tx4927_irq_cp0_type = {
+        .typename       = TX4927_CP0_NAME,
+        .startup        = tx4927_irq_cp0_startup,
+        .shutdown       = tx4927_irq_cp0_shutdown,
+        .enable         = tx4927_irq_cp0_enable,
+        .disable        = tx4927_irq_cp0_disable,
+        .ack            = tx4927_irq_cp0_mask_and_ack,
+        .end            = tx4927_irq_cp0_end,
+        .set_affinity   = NULL
+};
+
+#define TX4927_PIC_NAME "TX4927-PIC"
+static struct hw_interrupt_type tx4927_irq_pic_type = {
+        .typename       = TX4927_PIC_NAME,
+        .startup        = tx4927_irq_pic_startup,
+        .shutdown       = tx4927_irq_pic_shutdown,
+        .enable         = tx4927_irq_pic_enable,
+        .disable        = tx4927_irq_pic_disable,
+        .ack            = tx4927_irq_pic_mask_and_ack,
+        .end            = tx4927_irq_pic_end,
+        .set_affinity   = NULL
+};
+
+#define TX4927_PIC_ACTION(s) { no_action, 0, CPU_MASK_NONE, s, NULL, NULL }
+static struct irqaction tx4927_irq_pic_action =
+TX4927_PIC_ACTION(TX4927_PIC_NAME);
+
+#define CCP0_STATUS 12
+#define CCP0_CAUSE 13
+
+/*
+ * Functions for cp0
+ */
+
+#define tx4927_irq_cp0_mask(irq) ( 1 << ( irq-TX4927_IRQ_CP0_BEG+8 ) )
+
+static void
+tx4927_irq_cp0_modify(unsigned cp0_reg, unsigned clr_bits, unsigned set_bits)
+{
+        unsigned long val = 0;
+
+        switch (cp0_reg) {
+        case CCP0_STATUS:
+                val = read_c0_status();
+                break;
+
+        case CCP0_CAUSE:
+                val = read_c0_cause();
+                break;
+
+        }
+
+        val &= (~clr_bits);
+        val |= (set_bits);
+
+        switch (cp0_reg) {
+        case CCP0_STATUS:{
+                        write_c0_status(val);
+                        break;
+                }
+        case CCP0_CAUSE:{
+                        write_c0_cause(val);
+                        break;
+                }
+        }
+
+        return;
+}
+
+static void __init tx4927_irq_cp0_init(void)
+{
+        int i;
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_INIT, "beg=%d end=%d\n",
+                           TX4927_IRQ_CP0_BEG, TX4927_IRQ_CP0_END);
+
+        for (i = TX4927_IRQ_CP0_BEG; i <= TX4927_IRQ_CP0_END; i++) {
+                irq_desc[i].status = IRQ_DISABLED;
+                irq_desc[i].action = 0;
+                irq_desc[i].depth = 1;
+                irq_desc[i].handler = &tx4927_irq_cp0_type;
+        }
+
+        return;
+}
+
+static unsigned int tx4927_irq_cp0_startup(unsigned int irq)
+{
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_STARTUP, "irq=%d \n", irq);
+
+        tx4927_irq_cp0_enable(irq);
+
+        return (0);
+}
+
+static void tx4927_irq_cp0_shutdown(unsigned int irq)
+{
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_SHUTDOWN, "irq=%d \n", irq);
+
+        tx4927_irq_cp0_disable(irq);
+
+        return;
+}
+
+static void tx4927_irq_cp0_enable(unsigned int irq)
+{
+        unsigned long flags;
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_ENABLE, "irq=%d \n", irq);
+
+        spin_lock_irqsave(&tx4927_cp0_lock, flags);
+
+        tx4927_irq_cp0_modify(CCP0_STATUS, 0, tx4927_irq_cp0_mask(irq));
+
+        spin_unlock_irqrestore(&tx4927_cp0_lock, flags);
+
+        return;
+}
+
+static void tx4927_irq_cp0_disable(unsigned int irq)
+{
+        unsigned long flags;
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_DISABLE, "irq=%d \n", irq);
+
+        spin_lock_irqsave(&tx4927_cp0_lock, flags);
+
+        tx4927_irq_cp0_modify(CCP0_STATUS, tx4927_irq_cp0_mask(irq), 0);
+
+        spin_unlock_irqrestore(&tx4927_cp0_lock, flags);
+
+        return;
+}
+
+static void tx4927_irq_cp0_mask_and_ack(unsigned int irq)
+{
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_MASK, "irq=%d \n", irq);
+
+        tx4927_irq_cp0_disable(irq);
+
+        return;
+}
+
+static void tx4927_irq_cp0_end(unsigned int irq)
+{
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_CP0_ENDIRQ, "irq=%d \n", irq);
+
+        if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+                tx4927_irq_cp0_enable(irq);
+        }
+
+        return;
+}
+
+/*
+ * Functions for pic
+ */
+u32 tx4927_irq_pic_addr(int irq)
+{
+        /* MVMCP -- need to formulize this */
+        irq -= TX4927_IRQ_PIC_BEG;
+        switch (irq) {
+        case 17:
+        case 16:
+        case 1:
+        case 0:
+                return (0xff1ff610);
+
+        case 19:
+        case 18:
+        case 3:
+        case 2:
+                return (0xff1ff614);
+
+        case 21:
+        case 20:
+        case 5:
+        case 4:
+                return (0xff1ff618);
+
+        case 23:
+        case 22:
+        case 7:
+        case 6:
+                return (0xff1ff61c);
+
+        case 25:
+        case 24:
+        case 9:
+        case 8:
+                return (0xff1ff620);
+
+        case 27:
+        case 26:
+        case 11:
+        case 10:
+                return (0xff1ff624);
+
+        case 29:
+        case 28:
+        case 13:
+        case 12:
+                return (0xff1ff628);
+
+        case 31:
+        case 30:
+        case 15:
+        case 14:
+                return (0xff1ff62c);
+
+        }
+        return (0);
+}
+
+u32 tx4927_irq_pic_mask(int irq)
+{
+        /* MVMCP -- need to formulize this */
+        irq -= TX4927_IRQ_PIC_BEG;
+        switch (irq) {
+        case 31:
+        case 29:
+        case 27:
+        case 25:
+        case 23:
+        case 21:
+        case 19:
+        case 17:{
+                        return (0x07000000);
+                }
+        case 30:
+        case 28:
+        case 26:
+        case 24:
+        case 22:
+        case 20:
+        case 18:
+        case 16:{
+                        return (0x00070000);
+                }
+        case 15:
+        case 13:
+        case 11:
+        case 9:
+        case 7:
+        case 5:
+        case 3:
+        case 1:{
+                        return (0x00000700);
+                }
+        case 14:
+        case 12:
+        case 10:
+        case 8:
+        case 6:
+        case 4:
+        case 2:
+        case 0:{
+                        return (0x00000007);
+                }
+        }
+        return (0x00000000);
+}
+
+static void tx4927_irq_pic_modify(unsigned pic_reg, unsigned clr_bits,
+        unsigned set_bits)
+{
+        unsigned long val = 0;
+
+        val = TX4927_RD(pic_reg);
+        val &= (~clr_bits);
+        val |= (set_bits);
+        TX4927_WR(pic_reg, val);
+
+        return;
+}
+
+static void __init tx4927_irq_pic_init(void)
+{
+        unsigned long flags;
+        int i;
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_INIT, "beg=%d end=%d\n",
+                           TX4927_IRQ_PIC_BEG, TX4927_IRQ_PIC_END);
+
+        for (i = TX4927_IRQ_PIC_BEG; i <= TX4927_IRQ_PIC_END; i++) {
+                irq_desc[i].status = IRQ_DISABLED;
+                irq_desc[i].action = 0;
+                irq_desc[i].depth = 2;
+                irq_desc[i].handler = &tx4927_irq_pic_type;
+        }
+
+        setup_irq(TX4927_IRQ_NEST_PIC_ON_CP0, &tx4927_irq_pic_action);
+
+        spin_lock_irqsave(&tx4927_pic_lock, flags);
+
+        TX4927_WR(0xff1ff640, 0x6);     /* irq level mask -- only accept hightest */
+        TX4927_WR(0xff1ff600, TX4927_RD(0xff1ff600) | 0x1);     /* irq enable */
+
+        spin_unlock_irqrestore(&tx4927_pic_lock, flags);
+
+        return;
+}
+
+static unsigned int tx4927_irq_pic_startup(unsigned int irq)
+{
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_STARTUP, "irq=%d\n", irq);
+
+        tx4927_irq_pic_enable(irq);
+
+        return (0);
+}
+
+static void tx4927_irq_pic_shutdown(unsigned int irq)
+{
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_SHUTDOWN, "irq=%d\n", irq);
+
+        tx4927_irq_pic_disable(irq);
+
+        return;
+}
+
+static void tx4927_irq_pic_enable(unsigned int irq)
+{
+        unsigned long flags;
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_ENABLE, "irq=%d\n", irq);
+
+        spin_lock_irqsave(&tx4927_pic_lock, flags);
+
+        tx4927_irq_pic_modify(tx4927_irq_pic_addr(irq), 0,
+                              tx4927_irq_pic_mask(irq));
+
+        spin_unlock_irqrestore(&tx4927_pic_lock, flags);
+
+        return;
+}
+
+static void tx4927_irq_pic_disable(unsigned int irq)
+{
+        unsigned long flags;
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_DISABLE, "irq=%d\n", irq);
+
+        spin_lock_irqsave(&tx4927_pic_lock, flags);
+
+        tx4927_irq_pic_modify(tx4927_irq_pic_addr(irq),
+                              tx4927_irq_pic_mask(irq), 0);
+
+        spin_unlock_irqrestore(&tx4927_pic_lock, flags);
+
+        return;
+}
+
+static void tx4927_irq_pic_mask_and_ack(unsigned int irq)
+{
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_MASK, "irq=%d\n", irq);
+
+        tx4927_irq_pic_disable(irq);
+
+        return;
+}
+
+static void tx4927_irq_pic_end(unsigned int irq)
+{
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_PIC_ENDIRQ, "irq=%d\n", irq);
+
+        if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+                tx4927_irq_pic_enable(irq);
+        }
+
+        return;
+}
+
+/*
+ * Main init functions
+ */
+void __init tx4927_irq_init(void)
+{
+        extern asmlinkage void tx4927_irq_handler(void);
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "-\n");
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "=Calling tx4927_irq_cp0_init()\n");
+        tx4927_irq_cp0_init();
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "=Calling tx4927_irq_pic_init()\n");
+        tx4927_irq_pic_init();
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT,
+                           "=Calling set_except_vector(tx4927_irq_handler)\n");
+        set_except_vector(0, tx4927_irq_handler);
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_INIT, "+\n");
+
+        return;
+}
+
+int tx4927_irq_nested(void)
+{
+        int sw_irq = 0;
+        u32 level2;
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST1, "-\n");
+
+        level2 = TX4927_RD(0xff1ff6a0);
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST2, "=level2a=0x%x\n", level2);
+
+        if ((level2 & 0x10000) == 0) {
+                level2 &= 0x1f;
+                TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST3, "=level2b=0x%x\n", level2);
+
+                sw_irq = TX4927_IRQ_PIC_BEG + level2;
+                TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST3, "=sw_irq=%d\n", sw_irq);
+
+                if (sw_irq == 27) {
+                        TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST4, "=irq-%d\n",
+                                           sw_irq);
+
+#ifdef CONFIG_TOSHIBA_RBTX4927
+                        {
+                                sw_irq = toshiba_rbtx4927_irq_nested(sw_irq);
+                        }
+#endif
+
+                        TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST4, "=irq+%d\n",
+                                           sw_irq);
+                }
+        }
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST2, "=sw_irq=%d\n", sw_irq);
+
+        TX4927_IRQ_DPRINTK(TX4927_IRQ_NEST1, "+\n");
+
+        return (sw_irq);
+}