Support for Toshiba's RBHMA4500 eval board for the TX4938.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 424 insertions, 0 deletions

diff --git a/arch/mips/tx4938/common/irq.c b/arch/mips/tx4938/common/irq.c
new file mode 100644
index 000000000000..4f90d7faf634
--- /dev/null
+++ b/arch/mips/tx4938/common/irq.c
@@ -0,0 +1,424 @@
+/*
+ * linux/arch/mps/tx4938/common/irq.c
+ *
+ * Common tx4938 irq handler
+ * Copyright (C) 2000-2001 Toshiba Corporation
+ *
+ * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
+ */
+#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 <asm/bitops.h>
+#include <asm/bootinfo.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/mipsregs.h>
+#include <asm/system.h>
+#include <asm/tx4938/rbtx4938.h>
+
+/**********************************************************************************/
+/* Forwad definitions for all pic's                                               */
+/**********************************************************************************/
+
+static unsigned int tx4938_irq_cp0_startup(unsigned int irq);
+static void tx4938_irq_cp0_shutdown(unsigned int irq);
+static void tx4938_irq_cp0_enable(unsigned int irq);
+static void tx4938_irq_cp0_disable(unsigned int irq);
+static void tx4938_irq_cp0_mask_and_ack(unsigned int irq);
+static void tx4938_irq_cp0_end(unsigned int irq);
+
+static unsigned int tx4938_irq_pic_startup(unsigned int irq);
+static void tx4938_irq_pic_shutdown(unsigned int irq);
+static void tx4938_irq_pic_enable(unsigned int irq);
+static void tx4938_irq_pic_disable(unsigned int irq);
+static void tx4938_irq_pic_mask_and_ack(unsigned int irq);
+static void tx4938_irq_pic_end(unsigned int irq);
+
+/**********************************************************************************/
+/* Kernel structs for all pic's                                                   */
+/**********************************************************************************/
+DEFINE_SPINLOCK(tx4938_cp0_lock);
+DEFINE_SPINLOCK(tx4938_pic_lock);
+
+#define TX4938_CP0_NAME "TX4938-CP0"
+static struct hw_interrupt_type tx4938_irq_cp0_type = {
+        .typename = TX4938_CP0_NAME,
+        .startup = tx4938_irq_cp0_startup,
+        .shutdown = tx4938_irq_cp0_shutdown,
+        .enable = tx4938_irq_cp0_enable,
+        .disable = tx4938_irq_cp0_disable,
+        .ack = tx4938_irq_cp0_mask_and_ack,
+        .end = tx4938_irq_cp0_end,
+        .set_affinity = NULL
+};
+
+#define TX4938_PIC_NAME "TX4938-PIC"
+static struct hw_interrupt_type tx4938_irq_pic_type = {
+        .typename = TX4938_PIC_NAME,
+        .startup = tx4938_irq_pic_startup,
+        .shutdown = tx4938_irq_pic_shutdown,
+        .enable = tx4938_irq_pic_enable,
+        .disable = tx4938_irq_pic_disable,
+        .ack = tx4938_irq_pic_mask_and_ack,
+        .end = tx4938_irq_pic_end,
+        .set_affinity = NULL
+};
+
+static struct irqaction tx4938_irq_pic_action = {
+        .handler = no_action,
+        .flags = 0,
+        .mask = CPU_MASK_NONE,
+        .name = TX4938_PIC_NAME
+};
+
+/**********************************************************************************/
+/* Functions for cp0                                                              */
+/**********************************************************************************/
+
+#define tx4938_irq_cp0_mask(irq) ( 1 << ( irq-TX4938_IRQ_CP0_BEG+8 ) )
+
+static void __init
+tx4938_irq_cp0_init(void)
+{
+        int i;
+
+        for (i = TX4938_IRQ_CP0_BEG; i <= TX4938_IRQ_CP0_END; i++) {
+                irq_desc[i].status = IRQ_DISABLED;
+                irq_desc[i].action = 0;
+                irq_desc[i].depth = 1;
+                irq_desc[i].handler = &tx4938_irq_cp0_type;
+        }
+
+        return;
+}
+
+static unsigned int
+tx4938_irq_cp0_startup(unsigned int irq)
+{
+        tx4938_irq_cp0_enable(irq);
+
+        return (0);
+}
+
+static void
+tx4938_irq_cp0_shutdown(unsigned int irq)
+{
+        tx4938_irq_cp0_disable(irq);
+}
+
+static void
+tx4938_irq_cp0_enable(unsigned int irq)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&tx4938_cp0_lock, flags);
+
+        set_c0_status(tx4938_irq_cp0_mask(irq));
+
+        spin_unlock_irqrestore(&tx4938_cp0_lock, flags);
+}
+
+static void
+tx4938_irq_cp0_disable(unsigned int irq)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&tx4938_cp0_lock, flags);
+
+        clear_c0_status(tx4938_irq_cp0_mask(irq));
+
+        spin_unlock_irqrestore(&tx4938_cp0_lock, flags);
+
+        return;
+}
+
+static void
+tx4938_irq_cp0_mask_and_ack(unsigned int irq)
+{
+        tx4938_irq_cp0_disable(irq);
+
+        return;
+}
+
+static void
+tx4938_irq_cp0_end(unsigned int irq)
+{
+        if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+                tx4938_irq_cp0_enable(irq);
+        }
+
+        return;
+}
+
+/**********************************************************************************/
+/* Functions for pic                                                              */
+/**********************************************************************************/
+
+u32
+tx4938_irq_pic_addr(int irq)
+{
+        /* MVMCP -- need to formulize this */
+        irq -= TX4938_IRQ_PIC_BEG;
+
+        switch (irq) {
+        case 17:
+        case 16:
+        case 1:
+        case 0:{
+                        return (TX4938_MKA(TX4938_IRC_IRLVL0));
+                }
+        case 19:
+        case 18:
+        case 3:
+        case 2:{
+                        return (TX4938_MKA(TX4938_IRC_IRLVL1));
+                }
+        case 21:
+        case 20:
+        case 5:
+        case 4:{
+                        return (TX4938_MKA(TX4938_IRC_IRLVL2));
+                }
+        case 23:
+        case 22:
+        case 7:
+        case 6:{
+                        return (TX4938_MKA(TX4938_IRC_IRLVL3));
+                }
+        case 25:
+        case 24:
+        case 9:
+        case 8:{
+                        return (TX4938_MKA(TX4938_IRC_IRLVL4));
+                }
+        case 27:
+        case 26:
+        case 11:
+        case 10:{
+                        return (TX4938_MKA(TX4938_IRC_IRLVL5));
+                }
+        case 29:
+        case 28:
+        case 13:
+        case 12:{
+                        return (TX4938_MKA(TX4938_IRC_IRLVL6));
+                }
+        case 31:
+        case 30:
+        case 15:
+        case 14:{
+                        return (TX4938_MKA(TX4938_IRC_IRLVL7));
+                }
+        }
+
+        return (0);
+}
+
+u32
+tx4938_irq_pic_mask(int irq)
+{
+        /* MVMCP -- need to formulize this */
+        irq -= TX4938_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
+tx4938_irq_pic_modify(unsigned pic_reg, unsigned clr_bits, unsigned set_bits)
+{
+        unsigned long val = 0;
+
+        val = TX4938_RD(pic_reg);
+        val &= (~clr_bits);
+        val |= (set_bits);
+        TX4938_WR(pic_reg, val);
+        mmiowb();
+        TX4938_RD(pic_reg);
+
+        return;
+}
+
+static void __init
+tx4938_irq_pic_init(void)
+{
+        unsigned long flags;
+        int i;
+
+        for (i = TX4938_IRQ_PIC_BEG; i <= TX4938_IRQ_PIC_END; i++) {
+                irq_desc[i].status = IRQ_DISABLED;
+                irq_desc[i].action = 0;
+                irq_desc[i].depth = 2;
+                irq_desc[i].handler = &tx4938_irq_pic_type;
+        }
+
+        setup_irq(TX4938_IRQ_NEST_PIC_ON_CP0, &tx4938_irq_pic_action);
+
+        spin_lock_irqsave(&tx4938_pic_lock, flags);
+
+        TX4938_WR(0xff1ff640, 0x6);     /* irq level mask -- only accept hightest */
+        TX4938_WR(0xff1ff600, TX4938_RD(0xff1ff600) | 0x1);     /* irq enable */
+
+        spin_unlock_irqrestore(&tx4938_pic_lock, flags);
+
+        return;
+}
+
+static unsigned int
+tx4938_irq_pic_startup(unsigned int irq)
+{
+        tx4938_irq_pic_enable(irq);
+
+        return (0);
+}
+
+static void
+tx4938_irq_pic_shutdown(unsigned int irq)
+{
+        tx4938_irq_pic_disable(irq);
+
+        return;
+}
+
+static void
+tx4938_irq_pic_enable(unsigned int irq)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&tx4938_pic_lock, flags);
+
+        tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq), 0,
+                              tx4938_irq_pic_mask(irq));
+
+        spin_unlock_irqrestore(&tx4938_pic_lock, flags);
+
+        return;
+}
+
+static void
+tx4938_irq_pic_disable(unsigned int irq)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&tx4938_pic_lock, flags);
+
+        tx4938_irq_pic_modify(tx4938_irq_pic_addr(irq),
+                              tx4938_irq_pic_mask(irq), 0);
+
+        spin_unlock_irqrestore(&tx4938_pic_lock, flags);
+
+        return;
+}
+
+static void
+tx4938_irq_pic_mask_and_ack(unsigned int irq)
+{
+        tx4938_irq_pic_disable(irq);
+
+        return;
+}
+
+static void
+tx4938_irq_pic_end(unsigned int irq)
+{
+        if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
+                tx4938_irq_pic_enable(irq);
+        }
+
+        return;
+}
+
+/**********************************************************************************/
+/* Main init functions                                                            */
+/**********************************************************************************/
+
+void __init
+tx4938_irq_init(void)
+{
+        extern asmlinkage void tx4938_irq_handler(void);
+
+        tx4938_irq_cp0_init();
+        tx4938_irq_pic_init();
+        set_except_vector(0, tx4938_irq_handler);
+
+        return;
+}
+
+int
+tx4938_irq_nested(void)
+{
+        int sw_irq = 0;
+        u32 level2;
+
+        level2 = TX4938_RD(0xff1ff6a0);
+        if ((level2 & 0x10000) == 0) {
+                level2 &= 0x1f;
+                sw_irq = TX4938_IRQ_PIC_BEG + level2;
+                if (sw_irq == 26) {
+                        {
+                                extern int toshiba_rbtx4938_irq_nested(int sw_irq);
+                                sw_irq = toshiba_rbtx4938_irq_nested(sw_irq);
+                        }
+                }
+        }
+
+        wbflush();
+        return (sw_irq);
+}