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linux-stable-rt/arch/ppc/platforms/powerpmc250.c

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/*
* Board setup routines for Force PowerPMC-250 Processor PMC
*
* Author: Troy Benjegerdes <tbenjegerdes@mvista.com>
* Borrowed heavily from prpmc750_*.c by
* Matt Porter <mporter@mvista.com>
*
* 2001 (c) MontaVista, Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/reboot.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/types.h>
#include <linux/major.h>
#include <linux/initrd.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <asm/byteorder.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/time.h>
#include <platforms/powerpmc250.h>
#include <asm/open_pic.h>
#include <asm/pci-bridge.h>
#include <asm/mpc10x.h>
#include <asm/uaccess.h>
#include <asm/bootinfo.h>
extern void powerpmc250_find_bridges(void);
extern unsigned long loops_per_jiffy;
static u_char powerpmc250_openpic_initsenses[] __initdata =
{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, /* PMC INTA (also MPC107 output interrupt INTA) */
1, /* PMC INTB (also I82559 Ethernet controller) */
1, /* PMC INTC */
1, /* PMC INTD */
0, /* DUART interrupt (active high) */
};
static int
powerpmc250_show_cpuinfo(struct seq_file *m)
{
seq_printf(m,"machine\t\t: Force PowerPMC250\n");
return 0;
}
static void __init
powerpmc250_setup_arch(void)
{
/* init to some ~sane value until calibrate_delay() runs */
loops_per_jiffy = 50000000/HZ;
/* Lookup PCI host bridges */
powerpmc250_find_bridges();
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start)
ROOT_DEV = Root_RAM0;
else
#endif
#ifdef CONFIG_ROOT_NFS
ROOT_DEV = Root_NFS;
#else
ROOT_DEV = Root_SDA2;
#endif
printk("Force PowerPMC250 port (C) 2001 MontaVista Software, Inc. (source@mvista.com)\n");
}
#if 0
/*
* Compute the PrPMC750's bus speed using the baud clock as a
* reference.
*/
unsigned long __init powerpmc250_get_bus_speed(void)
{
unsigned long tbl_start, tbl_end;
unsigned long current_state, old_state, bus_speed;
unsigned char lcr, dll, dlm;
int baud_divisor, count;
/* Read the UART's baud clock divisor */
lcr = readb(PRPMC750_SERIAL_0_LCR);
writeb(lcr | UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
dll = readb(PRPMC750_SERIAL_0_DLL);
dlm = readb(PRPMC750_SERIAL_0_DLM);
writeb(lcr & ~UART_LCR_DLAB, PRPMC750_SERIAL_0_LCR);
baud_divisor = (dlm << 8) | dll;
/*
* Use the baud clock divisor and base baud clock
* to determine the baud rate and use that as
* the number of baud clock edges we use for
* the time base sample. Make it half the baud
* rate.
*/
count = PRPMC750_BASE_BAUD / (baud_divisor * 16);
/* Find the first edge of the baud clock */
old_state = readb(PRPMC750_STATUS_REG) & PRPMC750_BAUDOUT_MASK;
do {
current_state = readb(PRPMC750_STATUS_REG) &
PRPMC750_BAUDOUT_MASK;
} while(old_state == current_state);
old_state = current_state;
/* Get the starting time base value */
tbl_start = get_tbl();
/*
* Loop until we have found a number of edges equal
* to half the count (half the baud rate)
*/
do {
do {
current_state = readb(PRPMC750_STATUS_REG) &
PRPMC750_BAUDOUT_MASK;
} while(old_state == current_state);
old_state = current_state;
} while (--count);
/* Get the ending time base value */
tbl_end = get_tbl();
/* Compute bus speed */
bus_speed = (tbl_end-tbl_start)*128;
return bus_speed;
}
#endif
static void __init
powerpmc250_calibrate_decr(void)
{
unsigned long freq;
int divisor = 4;
//freq = powerpmc250_get_bus_speed();
#warning hardcoded bus freq
freq = 100000000;
tb_ticks_per_jiffy = freq / (HZ * divisor);
tb_to_us = mulhwu_scale_factor(freq/divisor, 1000000);
}
static void
powerpmc250_restart(char *cmd)
{
local_irq_disable();
/* Hard reset */
writeb(0x11, 0xfe000332);
while(1);
}
static void
powerpmc250_halt(void)
{
local_irq_disable();
while (1);
}
static void
powerpmc250_power_off(void)
{
powerpmc250_halt();
}
static void __init
powerpmc250_init_IRQ(void)
{
OpenPIC_InitSenses = powerpmc250_openpic_initsenses;
OpenPIC_NumInitSenses = sizeof(powerpmc250_openpic_initsenses);
mpc10x_set_openpic();
}
/*
* Set BAT 3 to map 0xf0000000 to end of physical memory space.
*/
static __inline__ void
powerpmc250_set_bat(void)
{
unsigned long bat3u, bat3l;
static int mapping_set = 0;
if (!mapping_set)
{
__asm__ __volatile__(
" lis %0,0xf000\n \
ori %1,%0,0x002a\n \
ori %0,%0,0x1ffe\n \
mtspr 0x21e,%0\n \
mtspr 0x21f,%1\n \
isync\n \
sync "
: "=r" (bat3u), "=r" (bat3l));
mapping_set = 1;
}
return;
}
static unsigned long __init
powerpmc250_find_end_of_memory(void)
{
/* Cover I/O space with a BAT */
/* yuck, better hope your ram size is a power of 2 -- paulus */
powerpmc250_set_bat();
return mpc10x_get_mem_size(MPC10X_MEM_MAP_B);
}
static void __init
powerpmc250_map_io(void)
{
io_block_mapping(0xfe000000, 0xfe000000, 0x02000000, _PAGE_IO);
}
void __init
platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
unsigned long r6, unsigned long r7)
{
parse_bootinfo(find_bootinfo());
#ifdef CONFIG_BLK_DEV_INITRD
if ( r4 )
{
initrd_start = r4 + KERNELBASE;
initrd_end = r5 + KERNELBASE;
}
#endif
/* Copy cmd_line parameters */
if ( r6)
{
*(char *)(r7 + KERNELBASE) = 0;
strcpy(cmd_line, (char *)(r6 + KERNELBASE));
}
isa_io_base = MPC10X_MAPB_ISA_IO_BASE;
isa_mem_base = MPC10X_MAPB_ISA_MEM_BASE;
pci_dram_offset = MPC10X_MAPB_DRAM_OFFSET;
ppc_md.setup_arch = powerpmc250_setup_arch;
ppc_md.show_cpuinfo = powerpmc250_show_cpuinfo;
ppc_md.init_IRQ = powerpmc250_init_IRQ;
ppc_md.get_irq = openpic_get_irq;
ppc_md.find_end_of_memory = powerpmc250_find_end_of_memory;
ppc_md.setup_io_mappings = powerpmc250_map_io;
ppc_md.restart = powerpmc250_restart;
ppc_md.power_off = powerpmc250_power_off;
ppc_md.halt = powerpmc250_halt;
/* PowerPMC250 has no timekeeper part */
ppc_md.time_init = NULL;
ppc_md.get_rtc_time = NULL;
ppc_md.set_rtc_time = NULL;
ppc_md.calibrate_decr = powerpmc250_calibrate_decr;
}
/*
* (This used to be arch/ppc/platforms/powerpmc250_pci.c)
*
* PCI support for Force PowerPMC250
*
*/
#undef DEBUG
#ifdef DEBUG
#define DBG(x...) printk(x)
#else
#define DBG(x...)
#endif /* DEBUG */
static inline int __init
powerpmc250_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
{
static char pci_irq_table[][4] =
/*
* PCI IDSEL/INTPIN->INTLINE
* A B C D
*/
{
{17, 0, 0, 0}, /* Device 11 - 82559 */
{0, 0, 0, 0}, /* 12 */
{0, 0, 0, 0}, /* 13 */
{0, 0, 0, 0}, /* 14 */
{0, 0, 0, 0}, /* 15 */
{16, 17, 18, 19}, /* Device 16 - PMC A1?? */
};
const long min_idsel = 11, max_idsel = 16, irqs_per_slot = 4;
return PCI_IRQ_TABLE_LOOKUP;
};
static int
powerpmc250_exclude_device(u_char bus, u_char devfn)
{
/*
* While doing PCI Scan the MPC107 will 'detect' itself as
* device on the PCI Bus, will create an incorrect response and
* later will respond incorrectly to Configuration read coming
* from another device.
*
* The work around is that when doing a PCI Scan one
* should skip its own device number in the scan.
*
* The top IDsel is AD13 and the middle is AD14.
*
* -- Note from force
*/
if ((bus == 0) && (PCI_SLOT(devfn) == 13 || PCI_SLOT(devfn) == 14)) {
return PCIBIOS_DEVICE_NOT_FOUND;
}
else {
return PCIBIOS_SUCCESSFUL;
}
}
void __init
powerpmc250_find_bridges(void)
{
struct pci_controller* hose;
hose = pcibios_alloc_controller();
if (!hose){
printk("Can't allocate PCI 'hose' structure!!!\n");
return;
}
hose->first_busno = 0;
hose->last_busno = 0xff;
if (mpc10x_bridge_init(hose,
MPC10X_MEM_MAP_B,
MPC10X_MEM_MAP_B,
MPC10X_MAPB_EUMB_BASE) == 0) {
hose->mem_resources[0].end = 0xffffffff;
hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
/* ppc_md.pcibios_fixup = pcore_pcibios_fixup; */
ppc_md.pci_swizzle = common_swizzle;
ppc_md.pci_exclude_device = powerpmc250_exclude_device;
ppc_md.pci_map_irq = powerpmc250_map_irq;
} else {
if (ppc_md.progress)
ppc_md.progress("Bridge init failed", 0x100);
printk("Host bridge init failed\n");
}
}
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