patch-2.3.39 linux/arch/ppc/kernel/oak_setup.c

• Lines: 285
• Date: Mon Jan 10 18:25:32 2000
• Orig file: v2.3.38/linux/arch/ppc/kernel/oak_setup.c
• Orig date: Tue Dec 7 09:32:41 1999

diff -u --recursive --new-file v2.3.38/linux/arch/ppc/kernel/oak_setup.c linux/arch/ppc/kernel/oak_setup.c
@@ -7,26 +7,74 @@
  *    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@cs.nmt.edu>, and Dan Malek
- *      <dmalek@jlc.net>.
+ *      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/interrupt.h>
+#include <linux/param.h>
 #include <linux/string.h>
 
+#include <asm/processor.h>
+#include <asm/board.h>
 #include <asm/machdep.h>
 #include <asm/page.h>
 
+#include "local_irq.h"
+#include "ppc4xx_pic.h"
+#include "time.h"
 #include "oak_setup.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
 oak_init(unsigned long r3, unsigned long r4, unsigned long r5, 
 	 unsigned long r6, unsigned long r7)
 {
-#if 0
+	/*
+	 * 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
@@ -44,24 +92,25 @@
  		*(char *)(r7 + KERNELBASE) = 0;
 		strcpy(cmd_line, (char *)(r6 + KERNELBASE));
 	}
-#endif /* 0 */
+
+	/* Initialize machine-dependency vectors */
 
 	ppc_md.setup_arch	 = oak_setup_arch;
-	ppc_md.setup_residual	 = NULL;
+	ppc_md.setup_residual	 = oak_setup_residual;
 	ppc_md.get_cpuinfo	 = NULL;
 	ppc_md.irq_cannonicalize = NULL;
-	ppc_md.init_IRQ		 = NULL;
-	ppc_md.get_irq		 = NULL;
+	ppc_md.init_IRQ		 = oak_init_IRQ;
+	ppc_md.get_irq		 = oak_get_irq;
 	ppc_md.init		 = NULL;
 
-	ppc_md.restart		 = NULL;
-	ppc_md.power_off	 = NULL;
-	ppc_md.halt		 = NULL;
-
-	ppc_md.time_init	 = NULL;
-	ppc_md.set_rtc_time	 = NULL;
-	ppc_md.get_rtc_time	 = NULL;
-	ppc_md.calibrate_decr	 = 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;
 
 	ppc_md.kbd_setkeycode    = NULL;
 	ppc_md.kbd_getkeycode    = NULL;
@@ -77,8 +126,168 @@
 	return;
 }
 
+/*
+ * Document me.
+ */
 void __init
 oak_setup_arch(void)
 {
+	/* XXX - Implement me */
+}
+
+/*
+ * int oak_setup_residual()
+ *
+ * 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_setup_residual(char *buffer)
+{
+	int len = 0;
+	bd_t *bp = (bd_t *)__res;
+
+	len += sprintf(len + buffer,
+		       "clock\t\t: %dMHz\n"
+		       "bus clock\t\t: %dMHz\n",
+		       bp->bi_intfreq / 1000000,
+		       bp->bi_busfreq / 1000000);
+
+	return (len);
+}
+
+/*
+ * Document me.
+ */
+void __init
+oak_init_IRQ(void)
+{
+	int i;
+
+	ppc4xx_pic_init();
+
+	for (i = 0; i < NR_IRQS; i++) {
+		irq_desc[i].handler = ppc4xx_pic;
+	}
+
+	return;
+}
+
+/*
+ * Document me.
+ */
+int
+oak_get_irq(struct pt_regs *regs)
+{
+	return (ppc4xx_pic_get_irq(regs));
+}
+
+/*
+ * 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.
+ */
+void __init
+oak_time_init(void)
+{
+	/* XXX - Implement me */
+}
+
+/*
+ * 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);
 }