Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 433 insertions, 0 deletions

diff --git a/arch/ppc/syslib/m8xx_setup.c b/arch/ppc/syslib/m8xx_setup.c
new file mode 100644
index 0000000..c1db2ab
--- /dev/null
+++ b/arch/ppc/syslib/m8xx_setup.c
@@ -0,0 +1,433 @@
+/*
+ *  arch/ppc/kernel/setup.c
+ *
+ *  Copyright (C) 1995  Linus Torvalds
+ *  Adapted from 'alpha' version by Gary Thomas
+ *  Modified by Cort Dougan (cort@cs.nmt.edu)
+ *  Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net)
+ *  Further modified for generic 8xx by Dan.
+ */
+
+/*
+ * bootup setup stuff..
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/user.h>
+#include <linux/a.out.h>
+#include <linux/tty.h>
+#include <linux/major.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+#include <linux/initrd.h>
+#include <linux/ioport.h>
+#include <linux/bootmem.h>
+#include <linux/seq_file.h>
+#include <linux/root_dev.h>
+
+#include <asm/mmu.h>
+#include <asm/reg.h>
+#include <asm/residual.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/mpc8xx.h>
+#include <asm/8xx_immap.h>
+#include <asm/machdep.h>
+#include <asm/bootinfo.h>
+#include <asm/time.h>
+#include <asm/xmon.h>
+
+#include "ppc8xx_pic.h"
+
+static int m8xx_set_rtc_time(unsigned long time);
+static unsigned long m8xx_get_rtc_time(void);
+void m8xx_calibrate_decr(void);
+
+unsigned char __res[sizeof(bd_t)];
+
+extern void m8xx_ide_init(void);
+
+extern unsigned long find_available_memory(void);
+extern void m8xx_cpm_reset(uint cpm_page);
+extern void m8xx_wdt_handler_install(bd_t *bp);
+extern void rpxfb_alloc_pages(void);
+extern void cpm_interrupt_init(void);
+
+void __attribute__ ((weak))
+board_init(void)
+{
+}
+
+void __init
+m8xx_setup_arch(void)
+{
+	int	cpm_page;
+
+	cpm_page = (int) alloc_bootmem_pages(PAGE_SIZE);
+
+	/* Reset the Communication Processor Module.
+	*/
+	m8xx_cpm_reset(cpm_page);
+
+#ifdef CONFIG_FB_RPX
+	rpxfb_alloc_pages();
+#endif
+
+#ifdef notdef
+	ROOT_DEV = Root_HDA1; /* hda1 */
+#endif
+
+#ifdef CONFIG_BLK_DEV_INITRD
+#if 0
+	ROOT_DEV = Root_FD0; /* floppy */
+	rd_prompt = 1;
+	rd_doload = 1;
+	rd_image_start = 0;
+#endif
+#if 0	/* XXX this may need to be updated for the new bootmem stuff,
+	   or possibly just deleted (see set_phys_avail() in init.c).
+	   - paulus. */
+	/* initrd_start and size are setup by boot/head.S and kernel/head.S */
+	if ( initrd_start )
+	{
+		if (initrd_end > *memory_end_p)
+		{
+			printk("initrd extends beyond end of memory "
+			       "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
+			       initrd_end,*memory_end_p);
+			initrd_start = 0;
+		}
+	}
+#endif
+#endif
+	board_init();
+}
+
+void
+abort(void)
+{
+#ifdef CONFIG_XMON
+	xmon(0);
+#endif
+	machine_restart(NULL);
+
+	/* not reached */
+	for (;;);
+}
+
+/* A place holder for time base interrupts, if they are ever enabled. */
+irqreturn_t timebase_interrupt(int irq, void * dev, struct pt_regs * regs)
+{
+	printk ("timebase_interrupt()\n");
+
+	return IRQ_HANDLED;
+}
+
+static struct irqaction tbint_irqaction = {
+	.handler = timebase_interrupt,
+	.mask = CPU_MASK_NONE,
+	.name = "tbint",
+};
+
+/* The decrementer counts at the system (internal) clock frequency divided by
+ * sixteen, or external oscillator divided by four.  We force the processor
+ * to use system clock divided by sixteen.
+ */
+void __init m8xx_calibrate_decr(void)
+{
+	bd_t	*binfo = (bd_t *)__res;
+	int freq, fp, divisor;
+
+	/* Unlock the SCCR. */
+	((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = ~KAPWR_KEY;
+	((volatile immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk = KAPWR_KEY;
+
+	/* Force all 8xx processors to use divide by 16 processor clock. */
+	((volatile immap_t *)IMAP_ADDR)->im_clkrst.car_sccr |= 0x02000000;
+
+	/* Processor frequency is MHz.
+	 * The value 'fp' is the number of decrementer ticks per second.
+	 */
+	fp = binfo->bi_intfreq / 16;
+	freq = fp*60;	/* try to make freq/1e6 an integer */
+        divisor = 60;
+        printk("Decrementer Frequency = %d/%d\n", freq, divisor);
+        tb_ticks_per_jiffy = freq / HZ / divisor;
+	tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
+
+	/* Perform some more timer/timebase initialization.  This used
+	 * to be done elsewhere, but other changes caused it to get
+	 * called more than once....that is a bad thing.
+	 *
+	 * First, unlock all of the registers we are going to modify.
+	 * To protect them from corruption during power down, registers
+	 * that are maintained by keep alive power are "locked".  To
+	 * modify these registers we have to write the key value to
+	 * the key location associated with the register.
+	 * Some boards power up with these unlocked, while others
+	 * are locked.  Writing anything (including the unlock code?)
+	 * to the unlocked registers will lock them again.  So, here
+	 * we guarantee the registers are locked, then we unlock them
+	 * for our use.
+	 */
+	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk = ~KAPWR_KEY;
+	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck = ~KAPWR_KEY;
+	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk    = ~KAPWR_KEY;
+	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk =  KAPWR_KEY;
+	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck =  KAPWR_KEY;
+	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk    =  KAPWR_KEY;
+
+	/* Disable the RTC one second and alarm interrupts. */
+	((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc &=
+						~(RTCSC_SIE | RTCSC_ALE);
+	/* Enable the RTC */
+	((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc |=
+						(RTCSC_RTF | RTCSC_RTE);
+
+	/* Enabling the decrementer also enables the timebase interrupts
+	 * (or from the other point of view, to get decrementer interrupts
+	 * we have to enable the timebase).  The decrementer interrupt
+	 * is wired into the vector table, nothing to do here for that.
+	 */
+	((volatile immap_t *)IMAP_ADDR)->im_sit.sit_tbscr =
+				((mk_int_int_mask(DEC_INTERRUPT) << 8) |
+					 (TBSCR_TBF | TBSCR_TBE));
+
+	if (setup_irq(DEC_INTERRUPT, &tbint_irqaction))
+		panic("Could not allocate timer IRQ!");
+
+#ifdef CONFIG_8xx_WDT
+	/* Install watchdog timer handler early because it might be
+	 * already enabled by the bootloader
+	 */
+	m8xx_wdt_handler_install(binfo);
+#endif
+}
+
+/* The RTC on the MPC8xx is an internal register.
+ * We want to protect this during power down, so we need to unlock,
+ * modify, and re-lock.
+ */
+static int
+m8xx_set_rtc_time(unsigned long time)
+{
+	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = KAPWR_KEY;
+	((volatile immap_t *)IMAP_ADDR)->im_sit.sit_rtc = time;
+	((volatile immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck = ~KAPWR_KEY;
+	return(0);
+}
+
+static unsigned long
+m8xx_get_rtc_time(void)
+{
+	/* Get time from the RTC. */
+	return((unsigned long)(((immap_t *)IMAP_ADDR)->im_sit.sit_rtc));
+}
+
+static void
+m8xx_restart(char *cmd)
+{
+	__volatile__ unsigned char dummy;
+
+	local_irq_disable();
+	((immap_t *)IMAP_ADDR)->im_clkrst.car_plprcr |= 0x00000080;
+
+	/* Clear the ME bit in MSR to cause checkstop on machine check
+	*/
+	mtmsr(mfmsr() & ~0x1000);
+
+	dummy = ((immap_t *)IMAP_ADDR)->im_clkrst.res[0];
+	printk("Restart failed\n");
+	while(1);
+}
+
+static void
+m8xx_power_off(void)
+{
+   m8xx_restart(NULL);
+}
+
+static void
+m8xx_halt(void)
+{
+   m8xx_restart(NULL);
+}
+
+
+static int
+m8xx_show_percpuinfo(struct seq_file *m, int i)
+{
+	bd_t	*bp;
+
+	bp = (bd_t *)__res;
+
+	seq_printf(m, "clock\t\t: %ldMHz\n"
+		   "bus clock\t: %ldMHz\n",
+		   bp->bi_intfreq / 1000000,
+		   bp->bi_busfreq / 1000000);
+
+	return 0;
+}
+
+#ifdef CONFIG_PCI
+static struct irqaction mbx_i8259_irqaction = {
+	.handler = mbx_i8259_action,
+	.mask = CPU_MASK_NONE,
+	.name = "i8259 cascade",
+};
+#endif
+
+/* Initialize the internal interrupt controller.  The number of
+ * interrupts supported can vary with the processor type, and the
+ * 82xx family can have up to 64.
+ * External interrupts can be either edge or level triggered, and
+ * need to be initialized by the appropriate driver.
+ */
+static void __init
+m8xx_init_IRQ(void)
+{
+	int i;
+
+	for (i = SIU_IRQ_OFFSET ; i < SIU_IRQ_OFFSET + NR_SIU_INTS ; i++)
+		irq_desc[i].handler = &ppc8xx_pic;
+
+	cpm_interrupt_init();
+
+#if defined(CONFIG_PCI)
+	for (i = I8259_IRQ_OFFSET ; i < I8259_IRQ_OFFSET + NR_8259_INTS ; i++)
+		irq_desc[i].handler = &i8259_pic;
+
+	i8259_pic_irq_offset = I8259_IRQ_OFFSET;
+	i8259_init(0);
+
+	/* The i8259 cascade interrupt must be level sensitive. */
+	((immap_t *)IMAP_ADDR)->im_siu_conf.sc_siel &=
+		~(0x80000000 >> ISA_BRIDGE_INT);
+
+	if (setup_irq(ISA_BRIDGE_INT, &mbx_i8259_irqaction))
+		enable_irq(ISA_BRIDGE_INT);
+#endif	/* CONFIG_PCI */
+}
+
+/* -------------------------------------------------------------------- */
+
+/*
+ * This is a big hack right now, but it may turn into something real
+ * someday.
+ *
+ * For the 8xx boards (at this time anyway), there is nothing to initialize
+ * associated the PROM.  Rather than include all of the prom.c
+ * functions in the image just to get prom_init, all we really need right
+ * now is the initialization of the physical memory region.
+ */
+static unsigned long __init
+m8xx_find_end_of_memory(void)
+{
+	bd_t	*binfo;
+	extern unsigned char __res[];
+
+	binfo = (bd_t *)__res;
+
+	return binfo->bi_memsize;
+}
+
+/*
+ * Now map in some of the I/O space that is generically needed
+ * or shared with multiple devices.
+ * All of this fits into the same 4Mbyte region, so it only
+ * requires one page table page.  (or at least it used to  -- paulus)
+ */
+static void __init
+m8xx_map_io(void)
+{
+        io_block_mapping(IMAP_ADDR, IMAP_ADDR, IMAP_SIZE, _PAGE_IO);
+#ifdef CONFIG_MBX
+        io_block_mapping(NVRAM_ADDR, NVRAM_ADDR, NVRAM_SIZE, _PAGE_IO);
+        io_block_mapping(MBX_CSR_ADDR, MBX_CSR_ADDR, MBX_CSR_SIZE, _PAGE_IO);
+        io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);
+
+	/* Map some of the PCI/ISA I/O space to get the IDE interface.
+	*/
+        io_block_mapping(PCI_ISA_IO_ADDR, PCI_ISA_IO_ADDR, 0x4000, _PAGE_IO);
+        io_block_mapping(PCI_IDE_ADDR, PCI_IDE_ADDR, 0x4000, _PAGE_IO);
+#endif
+#if defined(CONFIG_RPXLITE) || defined(CONFIG_RPXCLASSIC)
+	io_block_mapping(RPX_CSR_ADDR, RPX_CSR_ADDR, RPX_CSR_SIZE, _PAGE_IO);
+#if !defined(CONFIG_PCI)
+	io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
+#endif
+#endif
+#if defined(CONFIG_HTDMSOUND) || defined(CONFIG_RPXTOUCH) || defined(CONFIG_FB_RPX)
+	io_block_mapping(HIOX_CSR_ADDR, HIOX_CSR_ADDR, HIOX_CSR_SIZE, _PAGE_IO);
+#endif
+#ifdef CONFIG_FADS
+	io_block_mapping(BCSR_ADDR, BCSR_ADDR, BCSR_SIZE, _PAGE_IO);
+#endif
+#ifdef CONFIG_PCI
+        io_block_mapping(PCI_CSR_ADDR, PCI_CSR_ADDR, PCI_CSR_SIZE, _PAGE_IO);
+#endif
+#if defined(CONFIG_NETTA)
+	io_block_mapping(_IO_BASE,_IO_BASE,_IO_BASE_SIZE, _PAGE_IO);
+#endif
+}
+
+void __init
+platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
+		unsigned long r6, unsigned long r7)
+{
+	parse_bootinfo(find_bootinfo());
+
+	if ( r3 )
+		memcpy( (void *)__res,(void *)(r3+KERNELBASE), sizeof(bd_t) );
+
+#ifdef CONFIG_PCI
+	m8xx_setup_pci_ptrs();
+#endif
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	/* take care of initrd if we have one */
+	if ( r4 )
+	{
+		initrd_start = r4 + KERNELBASE;
+		initrd_end = r5 + KERNELBASE;
+	}
+#endif /* CONFIG_BLK_DEV_INITRD */
+	/* take care of cmd line */
+	if ( r6 )
+	{
+		*(char *)(r7+KERNELBASE) = 0;
+		strcpy(cmd_line, (char *)(r6+KERNELBASE));
+	}
+
+	ppc_md.setup_arch		= m8xx_setup_arch;
+	ppc_md.show_percpuinfo		= m8xx_show_percpuinfo;
+	ppc_md.irq_canonicalize	= NULL;
+	ppc_md.init_IRQ			= m8xx_init_IRQ;
+	ppc_md.get_irq			= m8xx_get_irq;
+	ppc_md.init			= NULL;
+
+	ppc_md.restart			= m8xx_restart;
+	ppc_md.power_off		= m8xx_power_off;
+	ppc_md.halt			= m8xx_halt;
+
+	ppc_md.time_init		= NULL;
+	ppc_md.set_rtc_time		= m8xx_set_rtc_time;
+	ppc_md.get_rtc_time		= m8xx_get_rtc_time;
+	ppc_md.calibrate_decr		= m8xx_calibrate_decr;
+
+	ppc_md.find_end_of_memory	= m8xx_find_end_of_memory;
+	ppc_md.setup_io_mappings	= m8xx_map_io;
+
+#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
+	m8xx_ide_init();
+#endif
+}