Resurrect Cobalt support for 2.6.

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

6 files changed, 175 insertions, 188 deletions

diff --git a/arch/mips/cobalt/Makefile b/arch/mips/cobalt/Makefile
index a5e6554b2326..3b6b7579d1de 100644
--- a/arch/mips/cobalt/Makefile
+++ b/arch/mips/cobalt/Makefile
@@ -2,6 +2,6 @@
 # Makefile for the Cobalt micro systems family specific parts of the kernel
 #
 
-obj-y    := irq.o int-handler.o reset.o setup.o promcon.o
+obj-y    := irq.o int-handler.o reset.o setup.o
 
 EXTRA_AFLAGS := $(CFLAGS)
diff --git a/arch/mips/cobalt/int-handler.S b/arch/mips/cobalt/int-handler.S
index 1a21dec1b3ca..f92608e8d84f 100644
--- a/arch/mips/cobalt/int-handler.S
+++ b/arch/mips/cobalt/int-handler.S
@@ -18,8 +18,8 @@
                 SAVE_ALL
                 CLI
 
-                la      ra, ret_from_irq
-                move    a1, sp
+                PTR_LA  ra, ret_from_irq
+                move    a0, sp
                 j       cobalt_irq
 
                 END(cobalt_handle_int)
diff --git a/arch/mips/cobalt/irq.c b/arch/mips/cobalt/irq.c
index 6d2a81581397..0d90851f925e 100644
--- a/arch/mips/cobalt/irq.c
+++ b/arch/mips/cobalt/irq.c
@@ -10,6 +10,8 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
 
 #include <asm/i8259.h>
 #include <asm/irq_cpu.h>
@@ -25,8 +27,8 @@ extern void cobalt_handle_int(void);
  * the CPU interrupt lines, and ones that come in on the via chip. The CPU
  * mappings are:
  *
- *    16,  - Software interrupt 0 (unused)      IE_SW0
- *    17   - Software interrupt 1 (unused)      IE_SW0
+ *    16   - Software interrupt 0 (unused)      IE_SW0
+ *    17   - Software interrupt 1 (unused)      IE_SW1
  *    18   - Galileo chip (timer)               IE_IRQ0
  *    19   - Tulip 0 + NCR SCSI                 IE_IRQ1
  *    20   - Tulip 1                            IE_IRQ2
@@ -42,61 +44,94 @@ extern void cobalt_handle_int(void);
  *    15  - IDE1
  */
 
-asmlinkage void cobalt_irq(struct pt_regs *regs)
+static inline void galileo_irq(struct pt_regs *regs)
 {
-        unsigned int pending = read_c0_status() & read_c0_cause();
-
-        if (pending & CAUSEF_IP2) {                     /* int 18 */
-                unsigned long irq_src = GALILEO_INL(GT_INTRCAUSE_OFS);
-
-                /* Check for timer irq ... */
-                if (irq_src & GALILEO_T0EXP) {
-                        /* Clear the int line */
-                        GALILEO_OUTL(0, GT_INTRCAUSE_OFS);
-                        do_IRQ(COBALT_TIMER_IRQ, regs);
-                }
-                return;
-        }
+        unsigned int mask, pending, devfn;
 
-        if (pending & CAUSEF_IP6) {                     /* int 22 */
-                int irq = i8259_irq();
+        mask = GALILEO_INL(GT_INTRMASK_OFS);
+        pending = GALILEO_INL(GT_INTRCAUSE_OFS) & mask;
 
-                if (irq >= 0)
-                        do_IRQ(irq, regs);
-                return;
-        }
+        if (pending & GALILEO_INTR_T0EXP) {
 
-        if (pending & CAUSEF_IP3) {                     /* int 19 */
-                do_IRQ(COBALT_ETH0_IRQ, regs);
-                return;
-        }
+                GALILEO_OUTL(~GALILEO_INTR_T0EXP, GT_INTRCAUSE_OFS);
+                do_IRQ(COBALT_GALILEO_IRQ, regs);
 
-        if (pending & CAUSEF_IP4) {                     /* int 20 */
-                do_IRQ(COBALT_ETH1_IRQ, regs);
-                return;
-        }
+        } else if (pending & GALILEO_INTR_RETRY_CTR) {
 
-        if (pending & CAUSEF_IP5) {                     /* int 21 */
-                do_IRQ(COBALT_SERIAL_IRQ, regs);
-                return;
-        }
+                devfn = GALILEO_INL(GT_PCI0_CFGADDR_OFS) >> 8;
+                GALILEO_OUTL(~GALILEO_INTR_RETRY_CTR, GT_INTRCAUSE_OFS);
+                printk(KERN_WARNING "Galileo: PCI retry count exceeded (%02x.%u)\n",
+                        PCI_SLOT(devfn), PCI_FUNC(devfn));
+
+        } else {
 
-        if (pending & CAUSEF_IP7) {                     /* int 23 */
-                do_IRQ(COBALT_QUBE_SLOT_IRQ, regs);
-                return;
+                GALILEO_OUTL(mask & ~pending, GT_INTRMASK_OFS);
+                printk(KERN_WARNING "Galileo: masking unexpected interrupt %08x\n", pending);
         }
 }
 
+static inline void via_pic_irq(struct pt_regs *regs)
+{
+        int irq;
+
+        irq = i8259_irq();
+        if (irq >= 0)
+                do_IRQ(irq, regs);
+}
+
+asmlinkage void cobalt_irq(struct pt_regs *regs)
+{
+        unsigned pending;
+
+        pending = read_c0_status() & read_c0_cause();
+
+        if (pending & CAUSEF_IP2)                       /* COBALT_GALILEO_IRQ (18) */
+
+                galileo_irq(regs);
+
+        else if (pending & CAUSEF_IP6)                  /* COBALT_VIA_IRQ (22) */
+
+                via_pic_irq(regs);
+
+        else if (pending & CAUSEF_IP3)                  /* COBALT_ETH0_IRQ (19) */
+
+                do_IRQ(COBALT_CPU_IRQ + 3, regs);
+
+        else if (pending & CAUSEF_IP4)                  /* COBALT_ETH1_IRQ (20) */
+
+                do_IRQ(COBALT_CPU_IRQ + 4, regs);
+
+        else if (pending & CAUSEF_IP5)                  /* COBALT_SERIAL_IRQ (21) */
+
+                do_IRQ(COBALT_CPU_IRQ + 5, regs);
+
+        else if (pending & CAUSEF_IP7)                  /* IRQ 23 */
+
+                do_IRQ(COBALT_CPU_IRQ + 7, regs);
+}
+
+static struct irqaction irq_via = {
+        no_action, 0, { { 0, } }, "cascade", NULL, NULL
+};
+
 void __init arch_init_irq(void)
 {
+        /*
+         * Mask all Galileo interrupts. The Galileo
+         * handler is set in cobalt_timer_setup()
+         */
+        GALILEO_OUTL(0, GT_INTRMASK_OFS);
+
         set_except_vector(0, cobalt_handle_int);
 
         init_i8259_irqs();                              /*  0 ... 15 */
-        mips_cpu_irq_init(16);                          /* 16 ... 23 */
+        mips_cpu_irq_init(COBALT_CPU_IRQ);              /* 16 ... 23 */
 
         /*
          * Mask all cpu interrupts
          *  (except IE4, we already masked those at VIA level)
          */
         change_c0_status(ST0_IM, IE_IRQ4);
+
+        setup_irq(COBALT_VIA_IRQ, &irq_via);
 }
diff --git a/arch/mips/cobalt/promcon.c b/arch/mips/cobalt/promcon.c
deleted file mode 100644
index f03df761e9f1..000000000000
--- a/arch/mips/cobalt/promcon.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/*
- * PROM console for Cobalt Raq2
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1995, 1996, 1997 by Ralf Baechle
- * Copyright (C) 2001 by Liam Davies (ldavies@agile.tv)
- *
- */
-
-#include <linux/init.h>
-#include <linux/console.h>
-#include <linux/kdev_t.h>
-#include <linux/serial_reg.h>
-
-#include <asm/delay.h>
-#include <asm/serial.h>
-#include <asm/io.h>
-
-static unsigned long port = 0xc800000;
-
-static __inline__ void ns16550_cons_put_char(char ch, unsigned long ioaddr)
-{
-        char lsr;
-
-        do {
-                lsr = inb(ioaddr + UART_LSR);
-        } while ((lsr & (UART_LSR_TEMT | UART_LSR_THRE)) != (UART_LSR_TEMT | UART_LSR_THRE));
-        outb(ch, ioaddr + UART_TX);
-}
-
-static __inline__ char ns16550_cons_get_char(unsigned long ioaddr)
-{
-        while ((inb(ioaddr + UART_LSR) & UART_LSR_DR) == 0)
-                udelay(1);
-        return inb(ioaddr + UART_RX);
-}
-
-void ns16550_console_write(struct console *co, const char *s, unsigned count)
-{
-        char lsr, ier;
-        unsigned i;
-
-        ier = inb(port + UART_IER);
-        outb(0x00, port + UART_IER);
-        for (i=0; i < count; i++, s++) {
-
-                if(*s == '\n')
-                        ns16550_cons_put_char('\r', port);
-                ns16550_cons_put_char(*s, port);
-        }
-
-        do {
-                lsr = inb(port + UART_LSR);
-        } while ((lsr & (UART_LSR_TEMT | UART_LSR_THRE)) != (UART_LSR_TEMT | UART_LSR_THRE));
-
-        outb(ier, port + UART_IER);
-}
-
-char getDebugChar(void)
-{
-        return ns16550_cons_get_char(port);
-}
-
-void putDebugChar(char kgdb_char)
-{
-        ns16550_cons_put_char(kgdb_char, port);
-}
-
-static struct console ns16550_console = {
-    .name       = "prom",
-    .setup      = NULL,
-    .write      = ns16550_console_write,
-    .flags      = CON_PRINTBUFFER,
-    .index      = -1,
-};
-
-static int __init ns16550_setup_console(void)
-{
-        register_console(&ns16550_console);
-
-        return 0;
-}
-
-console_initcall(ns16550_setup_console);
diff --git a/arch/mips/cobalt/reset.c b/arch/mips/cobalt/reset.c
index 084c8e59f42c..805a0e88507b 100644
--- a/arch/mips/cobalt/reset.c
+++ b/arch/mips/cobalt/reset.c
@@ -16,48 +16,45 @@
 #include <asm/reboot.h>
 #include <asm/system.h>
 #include <asm/mipsregs.h>
+#include <asm/cobalt/cobalt.h>
 
-void cobalt_machine_restart(char *command)
+void cobalt_machine_halt(void)
 {
-        *(volatile char *)0xbc000000 = 0x0f;
+        int state, last, diff;
+        unsigned long mark;
 
         /*
-         * Ouch, we're still alive ... This time we take the silver bullet ...
-         * ... and find that we leave the hardware in a state in which the
-         * kernel in the flush locks up somewhen during of after the PCI
-         * detection stuff.
+         * turn off bar on Qube, flash power off LED on RaQ (0.5Hz)
+         *
+         * restart if ENTER and SELECT are pressed
          */
-        set_c0_status(ST0_BEV | ST0_ERL);
-        change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
-        flush_cache_all();
-        write_c0_wired(0);
-        __asm__ __volatile__(
-                "jr\t%0"
-                :
-                : "r" (0xbfc00000));
-}
 
-extern int led_state;
-#define kLED            0xBC000000
-#define LEDSet(x)       (*(volatile unsigned char *) kLED) = (( unsigned char)x)
+        last = COBALT_KEY_PORT;
 
-void cobalt_machine_halt(void)
-{
-        int mark;
+        for (state = 0;;) {
+
+                state ^= COBALT_LED_POWER_OFF;
+                COBALT_LED_PORT = state;
+
+                diff = COBALT_KEY_PORT ^ last;
+                last ^= diff;
 
-        /* Blink our cute? little LED (number 3)... */
-        while (1) {
-                led_state = led_state | ( 1 << 3 );
-                LEDSet(led_state);
-                mark = jiffies;
-                while (jiffies<(mark+HZ));
-                led_state = led_state & ~( 1 << 3 );
-                LEDSet(led_state);
-                mark = jiffies;
-                while (jiffies<(mark+HZ));
+                if((diff & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)) && !(~last & (COBALT_KEY_ENTER | COBALT_KEY_SELECT)))
+                        COBALT_LED_PORT = COBALT_LED_RESET;
+
+                for (mark = jiffies; jiffies - mark < HZ;)
+                        ;
         }
 }
 
+void cobalt_machine_restart(char *command)
+{
+        COBALT_LED_PORT = COBALT_LED_RESET;
+
+        /* we should never get here */
+        cobalt_machine_halt();
+}
+
 /*
  * This triggers the luser mode device driver for the power switch ;-)
  */
diff --git a/arch/mips/cobalt/setup.c b/arch/mips/cobalt/setup.c
index f8138c15a535..d358a118fa31 100644
--- a/arch/mips/cobalt/setup.c
+++ b/arch/mips/cobalt/setup.c
@@ -13,6 +13,8 @@
 #include <linux/interrupt.h>
 #include <linux/pci.h>
 #include <linux/init.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
 
 #include <asm/bootinfo.h>
 #include <asm/time.h>
@@ -21,6 +23,7 @@
 #include <asm/processor.h>
 #include <asm/reboot.h>
 #include <asm/gt64120.h>
+#include <asm/serial.h>
 
 #include <asm/cobalt/cobalt.h>
 
@@ -30,45 +33,44 @@ extern void cobalt_machine_power_off(void);
 
 int cobalt_board_id;
 
-static char my_cmdline[CL_SIZE] = {
- "console=ttyS0,115200 "
-#ifdef CONFIG_IP_PNP
- "ip=on "
-#endif
-#ifdef CONFIG_ROOT_NFS
- "root=/dev/nfs "
-#else
- "root=/dev/hda1 "
-#endif
- };
-
 const char *get_system_type(void)
 {
+        switch (cobalt_board_id) {
+                case COBALT_BRD_ID_QUBE1:
+                        return "Cobalt Qube";
+                case COBALT_BRD_ID_RAQ1:
+                        return "Cobalt RaQ";
+                case COBALT_BRD_ID_QUBE2:
+                        return "Cobalt Qube2";
+                case COBALT_BRD_ID_RAQ2:
+                        return "Cobalt RaQ2";
+        }
         return "MIPS Cobalt";
 }
 
 static void __init cobalt_timer_setup(struct irqaction *irq)
 {
-        /* Load timer value for 150 Hz */
-        GALILEO_OUTL(500000, GT_TC0_OFS);
+        /* Load timer value for 1KHz (TCLK is 50MHz) */
+        GALILEO_OUTL(50*1000*1000 / 1000, GT_TC0_OFS);
 
-        /* Register our timer interrupt */
-        setup_irq(COBALT_TIMER_IRQ, irq);
+        /* Enable timer */
+        GALILEO_OUTL(GALILEO_ENTC0 | GALILEO_SELTC0, GT_TC_CONTROL_OFS);
 
-        /* Enable timer ints */
-        GALILEO_OUTL((GALILEO_ENTC0 | GALILEO_SELTC0), GT_TC_CONTROL_OFS);
-        /* Unmask timer int */
-        GALILEO_OUTL(0x100, GT_INTRMASK_OFS);
+        /* Register interrupt */
+        setup_irq(COBALT_GALILEO_IRQ, irq);
+
+        /* Enable interrupt */
+        GALILEO_OUTL(GALILEO_INTR_T0EXP | GALILEO_INL(GT_INTRMASK_OFS), GT_INTRMASK_OFS);
 }
 
 extern struct pci_ops gt64111_pci_ops;
 
 static struct resource cobalt_mem_resource = {
-        "GT64111 PCI MEM", GT64111_IO_BASE, 0xffffffffUL, IORESOURCE_MEM
+        "PCI memory", GT64111_MEM_BASE, GT64111_MEM_END, IORESOURCE_MEM
 };
 
 static struct resource cobalt_io_resource = {
-        "GT64111 IO MEM", 0x00001000UL, 0x0fffffffUL, IORESOURCE_IO
+        "PCI I/O", 0x1000, 0xffff, IORESOURCE_IO
 };
 
 static struct resource cobalt_io_resources[] = {
@@ -86,11 +88,12 @@ static struct pci_controller cobalt_pci_controller = {
         .mem_resource   = &cobalt_mem_resource,
         .mem_offset     = 0,
         .io_resource    = &cobalt_io_resource,
-        .io_offset      = 0x00001000UL - GT64111_IO_BASE
+        .io_offset      = 0 - GT64111_IO_BASE
 };
 
 void __init plat_setup(void)
 {
+        static struct uart_port uart;
         unsigned int devfn = PCI_DEVFN(COBALT_PCICONF_VIA, 0);
         int i;
 
@@ -100,7 +103,10 @@ void __init plat_setup(void)
 
         board_timer_setup = cobalt_timer_setup;
 
-        set_io_port_base(KSEG1ADDR(GT64111_IO_BASE));
+        set_io_port_base(CKSEG1ADDR(GT64111_IO_BASE));
+
+        /* I/O port resource must include UART and LCD/buttons */
+        ioport_resource.end = 0x0fffffff;
 
         /*
          * This is a prom style console. We just poke at the
@@ -120,25 +126,61 @@ void __init plat_setup(void)
         cobalt_board_id >>= ((VIA_COBALT_BRD_ID_REG & 3) * 8);
         cobalt_board_id = VIA_COBALT_BRD_REG_to_ID(cobalt_board_id);
 
+        printk("Cobalt board ID: %d\n", cobalt_board_id);
+
 #ifdef CONFIG_PCI
         register_pci_controller(&cobalt_pci_controller);
 #endif
+
+#ifdef CONFIG_SERIAL_8250
+        if (cobalt_board_id > COBALT_BRD_ID_RAQ1) {
+
+                uart.line       = 0;
+                uart.type       = PORT_UNKNOWN;
+                uart.uartclk    = 18432000;
+                uart.irq        = COBALT_SERIAL_IRQ;
+                uart.flags      = STD_COM_FLAGS;
+                uart.iobase     = 0xc800000;
+                uart.iotype     = UPIO_PORT;
+
+                early_serial_setup(&uart);
+        }
+#endif
 }
 
 /*
  * Prom init. We read our one and only communication with the firmware.
- * Grab the amount of installed memory
+ * Grab the amount of installed memory.
+ * Better boot loaders (CoLo) pass a command line too :-)
  */
 
 void __init prom_init(void)
 {
-        int argc = fw_arg0;
-
-        strcpy(arcs_cmdline, my_cmdline);
+        int narg, indx, posn, nchr;
+        unsigned long memsz;
+        char **argv;
 
         mips_machgroup = MACH_GROUP_COBALT;
 
-        add_memory_region(0x0, argc & 0x7fffffff, BOOT_MEM_RAM);
+        memsz = fw_arg0 & 0x7fff0000;
+        narg = fw_arg0 & 0x0000ffff;
+
+        if (narg) {
+                arcs_cmdline[0] = '\0';
+                argv = (char **) fw_arg1;
+                posn = 0;
+                for (indx = 1; indx < narg; ++indx) {
+                        nchr = strlen(argv[indx]);
+                        if (posn + 1 + nchr + 1 > sizeof(arcs_cmdline))
+                                break;
+                        if (posn)
+                                arcs_cmdline[posn++] = ' ';
+                        strcpy(arcs_cmdline + posn, argv[indx]);
+                        posn += nchr;
+                }
+        }
+
+        add_memory_region(0x0, memsz, BOOT_MEM_RAM);
 }
 
 unsigned long __init prom_free_prom_memory(void)