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kernel-fxtec-pro1x/arch/ppc/syslib/m8xx_setup.c
Marcelo Tosatti fb64c2446b [PATCH] ppc32: m8xx watchdog update 
This updates m8xx_wdt as follows:

1) Remove now obsolete fpos check in the write() function. The driver is
currently non functional due to this bug.

2) Use in/out macros for register access.

3) Allows m8xx_wdt to use a kernel timer instead of the builtin RTC/PIT
for keep-alive trigger (which is responsible for servicing the watchdog
until an userspace application takes over). For instance Cyclades PRxK
boards (MPC 855T based) have a non-functional internal RTC/PIT unit.
Behaviour for boards with RTC/PIT is unchaged.

4) The last change required moving the RTCSC register setting code
to a weak function which can be overriden by board specific files.
Otherwise the timer init code trashes the register making it impossible
for m8xx_wdt to detect the situation.

Signed-off-by: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-01-09 14:50:51 +11:00

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/*
* 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 <asm/ppc_sys.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(void);
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)
{
/* Reset the Communication Processor Module.
*/
m8xx_cpm_reset();
#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",
};
/* per-board overridable init_internal_rtc() function. */
void __init __attribute__ ((weak))
init_internal_rtc(void)
{
/* Disable the RTC one second and alarm interrupts. */
out_be16(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc, in_be16(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc) & ~(RTCSC_SIE | RTCSC_ALE));
/* Enable the RTC */
out_be16(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc, in_be16(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtcsc) | (RTCSC_RTF | RTCSC_RTE));
}
/* 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. */
out_be32(&((immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk, ~KAPWR_KEY);
out_be32(&((immap_t *)IMAP_ADDR)->im_clkrstk.cark_sccrk, KAPWR_KEY);
/* Force all 8xx processors to use divide by 16 processor clock. */
out_be32(&((immap_t *)IMAP_ADDR)->im_clkrst.car_sccr,
in_be32(&((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.
*/
out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk, ~KAPWR_KEY);
out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck, ~KAPWR_KEY);
out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk, ~KAPWR_KEY);
out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_tbscrk, KAPWR_KEY);
out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_rtcsck, KAPWR_KEY);
out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_tbk, KAPWR_KEY);
init_internal_rtc();
/* 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.
*/
out_be16(&((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)
{
out_be32(&((immap_t *)IMAP_ADDR)->im_sitk.sitk_rtck, KAPWR_KEY);
out_be32(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtc, time);
out_be32(&((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) in_be32(&((immap_t *)IMAP_ADDR)->im_sit.sit_rtc);
}
static void
m8xx_restart(char *cmd)
{
__volatile__ unsigned char dummy;
local_irq_disable();
out_be32(&((immap_t *)IMAP_ADDR)->im_clkrst.car_plprcr, in_be32(&((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 = in_8(&((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: %uMHz\n"
"bus clock\t: %uMHz\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. */
out_be32(&((immap_t *)IMAP_ADDR)->im_siu_conf.sc_siel, in_be32(&((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));
}
identify_ppc_sys_by_name(BOARD_CHIP_NAME);
ppc_md.setup_arch = m8xx_setup_arch;
ppc_md.show_percpuinfo = m8xx_show_percpuinfo;
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_MPC8xx_IDE)
m8xx_ide_init();
#endif
}
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