1 files changed, 255 insertions, 0 deletions

diff --git a/arch/ppc/platforms/4xx/oak.c b/arch/ppc/platforms/4xx/oak.c
new file mode 100644
index 000000000000..fa25ee1fa733
--- /dev/null
+++ b/arch/ppc/platforms/4xx/oak.c
@@ -0,0 +1,255 @@
+/*
+ *
+ *    Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
+ *
+ *    Module name: oak.c
+ *
+ *    Description:
+ *      Architecture- / platform-specific boot-time initialization code for
+ *      the IBM PowerPC 403GCX "Oak" evaluation board. Adapted from original
+ *      code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
+ *      <dan@net4x.com>.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/threads.h>
+#include <linux/param.h>
+#include <linux/string.h>
+#include <linux/initrd.h>
+#include <linux/irq.h>
+#include <linux/seq_file.h>
+
+#include <asm/board.h>
+#include <asm/machdep.h>
+#include <asm/page.h>
+#include <asm/bootinfo.h>
+#include <asm/ppc4xx_pic.h>
+#include <asm/time.h>
+
+#include "oak.h"
+
+/* Function Prototypes */
+
+extern void abort(void);
+
+/* Global Variables */
+
+unsigned char __res[sizeof(bd_t)];
+
+
+/*
+ * void __init oak_init()
+ *
+ * Description:
+ *   This routine...
+ *
+ * Input(s):
+ *   r3 - Optional pointer to a board information structure.
+ *   r4 - Optional pointer to the physical starting address of the init RAM
+ *        disk.
+ *   r5 - Optional pointer to the physical ending address of the init RAM
+ *        disk.
+ *   r6 - Optional pointer to the physical starting address of any kernel
+ *        command-line parameters.
+ *   r7 - Optional pointer to the physical ending address of any kernel
+ *        command-line parameters.
+ *
+ * Output(s):
+ *   N/A
+ *
+ * Returns:
+ *   N/A
+ *
+ */
+void __init
+platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
+              unsigned long r6, unsigned long r7)
+{
+        parse_bootinfo(find_bootinfo());
+
+        /*
+         * If we were passed in a board information, copy it into the
+         * residual data area.
+         */
+        if (r3) {
+                memcpy((void *)__res, (void *)(r3 + KERNELBASE), sizeof(bd_t));
+        }
+
+#if defined(CONFIG_BLK_DEV_INITRD)
+        /*
+         * If the init RAM disk has been configured in, and there's a valid
+         * starting address for it, set it up.
+         */
+        if (r4) {
+                initrd_start = r4 + KERNELBASE;
+                initrd_end = r5 + KERNELBASE;
+        }
+#endif /* CONFIG_BLK_DEV_INITRD */
+
+        /* Copy the kernel command line arguments to a safe place. */
+
+        if (r6) {
+                *(char *)(r7 + KERNELBASE) = 0;
+                strcpy(cmd_line, (char *)(r6 + KERNELBASE));
+        }
+
+        /* Initialize machine-dependency vectors */
+
+        ppc_md.setup_arch               = oak_setup_arch;
+        ppc_md.show_percpuinfo          = oak_show_percpuinfo;
+        ppc_md.irq_canonicalize         = NULL;
+        ppc_md.init_IRQ                 = ppc4xx_pic_init;
+        ppc_md.get_irq                  = NULL;  /* Set in ppc4xx_pic_init() */
+        ppc_md.init                     = NULL;
+
+        ppc_md.restart                  = oak_restart;
+        ppc_md.power_off                = oak_power_off;
+        ppc_md.halt                     = oak_halt;
+
+        ppc_md.time_init                = oak_time_init;
+        ppc_md.set_rtc_time             = oak_set_rtc_time;
+        ppc_md.get_rtc_time             = oak_get_rtc_time;
+        ppc_md.calibrate_decr           = oak_calibrate_decr;
+}
+
+/*
+ * Document me.
+ */
+void __init
+oak_setup_arch(void)
+{
+        /* XXX - Implement me */
+}
+
+/*
+ * int oak_show_percpuinfo()
+ *
+ * Description:
+ *   This routine pretty-prints the platform's internal CPU and bus clock
+ *   frequencies into the buffer for usage in /proc/cpuinfo.
+ *
+ * Input(s):
+ *  *buffer - Buffer into which CPU and bus clock frequencies are to be
+ *            printed.
+ *
+ * Output(s):
+ *  *buffer - Buffer with the CPU and bus clock frequencies.
+ *
+ * Returns:
+ *   The number of bytes copied into 'buffer' if OK, otherwise zero or less
+ *   on error.
+ */
+int
+oak_show_percpuinfo(struct seq_file *m, int i)
+{
+        bd_t *bp = (bd_t *)__res;
+
+        seq_printf(m, "clock\t\t: %dMHz\n"
+                   "bus clock\t\t: %dMHz\n",
+                   bp->bi_intfreq / 1000000,
+                   bp->bi_busfreq / 1000000);
+
+        return 0;
+}
+
+/*
+ * Document me.
+ */
+void
+oak_restart(char *cmd)
+{
+        abort();
+}
+
+/*
+ * Document me.
+ */
+void
+oak_power_off(void)
+{
+        oak_restart(NULL);
+}
+
+/*
+ * Document me.
+ */
+void
+oak_halt(void)
+{
+        oak_restart(NULL);
+}
+
+/*
+ * Document me.
+ */
+long __init
+oak_time_init(void)
+{
+        /* XXX - Implement me */
+        return 0;
+}
+
+/*
+ * Document me.
+ */
+int __init
+oak_set_rtc_time(unsigned long time)
+{
+        /* XXX - Implement me */
+
+        return (0);
+}
+
+/*
+ * Document me.
+ */
+unsigned long __init
+oak_get_rtc_time(void)
+{
+        /* XXX - Implement me */
+
+        return (0);
+}
+
+/*
+ * void __init oak_calibrate_decr()
+ *
+ * Description:
+ *   This routine retrieves the internal processor frequency from the board
+ *   information structure, sets up the kernel timer decrementer based on
+ *   that value, enables the 403 programmable interval timer (PIT) and sets
+ *   it up for auto-reload.
+ *
+ * Input(s):
+ *   N/A
+ *
+ * Output(s):
+ *   N/A
+ *
+ * Returns:
+ *   N/A
+ *
+ */
+void __init
+oak_calibrate_decr(void)
+{
+        unsigned int freq;
+        bd_t *bip = (bd_t *)__res;
+
+        freq = bip->bi_intfreq;
+
+        decrementer_count = freq / HZ;
+        count_period_num = 1;
+        count_period_den = freq;
+
+        /* Enable the PIT and set auto-reload of its value */
+
+        mtspr(SPRN_TCR, TCR_PIE | TCR_ARE);
+
+        /* Clear any pending timer interrupts */
+
+        mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_PIS | TSR_FIS);
+}