OpenSDV
/
linux-stable-rt
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
linux-stable-rt/arch/ppc/platforms/prpmc750.c

365 lines
9.9 KiB
C
Raw Blame History

/*
* arch/ppc/platforms/prpmc750_setup.c
*
* Board setup routines for Motorola PrPMC750
*
* Author: Matt Porter <mporter@mvista.com>
*
* 2001-2004 (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/config.h>
#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/irq.h>
#include <linux/seq_file.h>
#include <linux/ide.h>
#include <linux/root_dev.h>
#include <linux/slab.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/pci-bridge.h>
#include <asm/uaccess.h>
#include <asm/time.h>
#include <asm/open_pic.h>
#include <asm/bootinfo.h>
#include <asm/hawk.h>
#include "prpmc750.h"
extern unsigned long loops_per_jiffy;
extern void gen550_progress(char *, unsigned short);
static u_char prpmc750_openpic_initsenses[] __initdata =
{
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT0 */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UART */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_DEBUGINT */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HAWK_WDT */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_ABORT */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT1 */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT2 */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_HOSTINT3 */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTA */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTB */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTC */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_PMC_INTD */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC750_INT_UNUSED */
};
/*
* Motorola PrPMC750/PrPMC800 in PrPMCBASE or PrPMC-Carrier
* Combined irq tables. Only Base has IDSEL 14, only Carrier has 21 and 22.
*/
static inline int
prpmc_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
*/
{
{12, 0, 0, 0}, /* IDSEL 14 - Ethernet, base */
{0, 0, 0, 0}, /* IDSEL 15 - unused */
{10, 11, 12, 9}, /* IDSEL 16 - PMC A1, PMC1 */
{10, 11, 12, 9}, /* IDSEL 17 - PrPMC-A-B, PMC2-B */
{11, 12, 9, 10}, /* IDSEL 18 - PMC A1-B, PMC1-B */
{0, 0, 0, 0}, /* IDSEL 19 - unused */
{9, 10, 11, 12}, /* IDSEL 20 - P2P Bridge */
{11, 12, 9, 10}, /* IDSEL 21 - PMC A2, carrier */
{12, 9, 10, 11}, /* IDSEL 22 - PMC A2-B, carrier */
};
const long min_idsel = 14, max_idsel = 22, irqs_per_slot = 4;
return PCI_IRQ_TABLE_LOOKUP;
};
static void __init prpmc750_pcibios_fixup(void)
{
struct pci_dev *dev;
unsigned short wtmp;
/*
* Kludge to clean up after PPC6BUG which doesn't
* configure the CL5446 VGA card. Also the
* resource subsystem doesn't fixup the
* PCI mem resources on the CL5446.
*/
if ((dev = pci_get_device(PCI_VENDOR_ID_CIRRUS,
PCI_DEVICE_ID_CIRRUS_5446, 0))) {
dev->resource[0].start += PRPMC750_PCI_PHY_MEM_OFFSET;
dev->resource[0].end += PRPMC750_PCI_PHY_MEM_OFFSET;
pci_read_config_word(dev, PCI_COMMAND, &wtmp);
pci_write_config_word(dev, PCI_COMMAND, wtmp | 3);
/* Enable Color mode in MISC reg */
outb(0x03, 0x3c2);
/* Select DRAM config reg */
outb(0x0f, 0x3c4);
/* Set proper DRAM config */
outb(0xdf, 0x3c5);
pci_dev_put(dev);
}
}
void __init prpmc750_find_bridges(void)
{
struct pci_controller *hose;
hose = pcibios_alloc_controller();
if (!hose)
return;
hose->first_busno = 0;
hose->last_busno = 0xff;
hose->io_base_virt = (void *)PRPMC750_ISA_IO_BASE;
hose->pci_mem_offset = PRPMC750_PCI_PHY_MEM_OFFSET;
pci_init_resource(&hose->io_resource,
PRPMC750_PCI_IO_START,
PRPMC750_PCI_IO_END,
IORESOURCE_IO, "PCI host bridge");
pci_init_resource(&hose->mem_resources[0],
PRPMC750_PROC_PCI_MEM_START,
PRPMC750_PROC_PCI_MEM_END,
IORESOURCE_MEM, "PCI host bridge");
hose->io_space.start = PRPMC750_PCI_IO_START;
hose->io_space.end = PRPMC750_PCI_IO_END;
hose->mem_space.start = PRPMC750_PCI_MEM_START;
hose->mem_space.end = PRPMC750_PCI_MEM_END - HAWK_MPIC_SIZE;
if (hawk_init(hose, PRPMC750_HAWK_PPC_REG_BASE,
PRPMC750_PROC_PCI_MEM_START,
PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE,
PRPMC750_PROC_PCI_IO_START, PRPMC750_PROC_PCI_IO_END,
PRPMC750_PROC_PCI_MEM_END - HAWK_MPIC_SIZE + 1)
!= 0) {
printk(KERN_CRIT "Could not initialize host bridge\n");
}
hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
ppc_md.pcibios_fixup = prpmc750_pcibios_fixup;
ppc_md.pci_swizzle = common_swizzle;
ppc_md.pci_map_irq = prpmc_map_irq;
}
static int prpmc750_show_cpuinfo(struct seq_file *m)
{
seq_printf(m, "machine\t\t: PrPMC750\n");
return 0;
}
static void __init prpmc750_setup_arch(void)
{
/* init to some ~sane value until calibrate_delay() runs */
loops_per_jiffy = 50000000 / HZ;
/* Lookup PCI host bridges */
prpmc750_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
OpenPIC_InitSenses = prpmc750_openpic_initsenses;
OpenPIC_NumInitSenses = sizeof(prpmc750_openpic_initsenses);
printk(KERN_INFO "Port by MontaVista Software, Inc. "
"(source@mvista.com)\n");
}
/*
* Compute the PrPMC750's bus speed using the baud clock as a
* reference.
*/
static unsigned long __init prpmc750_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;
}
static void __init prpmc750_calibrate_decr(void)
{
unsigned long freq;
int divisor = 4;
freq = prpmc750_get_bus_speed();
tb_ticks_per_jiffy = freq / (HZ * divisor);
tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
}
static void prpmc750_restart(char *cmd)
{
local_irq_disable();
writeb(PRPMC750_MODRST_MASK, PRPMC750_MODRST_REG);
while (1) ;
}
static void prpmc750_halt(void)
{
local_irq_disable();
while (1) ;
}
static void prpmc750_power_off(void)
{
prpmc750_halt();
}
static void __init prpmc750_init_IRQ(void)
{
openpic_init(0);
}
/*
* Set BAT 3 to map 0xf0000000 to end of physical memory space.
*/
static __inline__ void prpmc750_set_bat(void)
{
mb();
mtspr(SPRN_DBAT1U, 0xf0001ffe);
mtspr(SPRN_DBAT1L, 0xf000002a);
mb();
}
/*
* We need to read the Falcon/Hawk memory controller
* to properly determine this value
*/
static unsigned long __init prpmc750_find_end_of_memory(void)
{
/* Read the memory size from the Hawk SMC */
return hawk_get_mem_size(PRPMC750_HAWK_SMC_BASE);
}
static void __init prpmc750_map_io(void)
{
io_block_mapping(PRPMC750_ISA_IO_BASE, PRPMC750_ISA_IO_BASE,
0x10000000, _PAGE_IO);
#if 0
io_block_mapping(0xf0000000, 0xc0000000, 0x08000000, _PAGE_IO);
#endif
io_block_mapping(0xf8000000, 0xf8000000, 0x08000000, _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());
/* Cover the Hawk registers with a BAT */
prpmc750_set_bat();
isa_io_base = PRPMC750_ISA_IO_BASE;
isa_mem_base = PRPMC750_ISA_MEM_BASE;
pci_dram_offset = PRPMC750_PCI_DRAM_OFFSET;
ppc_md.setup_arch = prpmc750_setup_arch;
ppc_md.show_cpuinfo = prpmc750_show_cpuinfo;
ppc_md.init_IRQ = prpmc750_init_IRQ;
ppc_md.get_irq = openpic_get_irq;
ppc_md.find_end_of_memory = prpmc750_find_end_of_memory;
ppc_md.setup_io_mappings = prpmc750_map_io;
ppc_md.restart = prpmc750_restart;
ppc_md.power_off = prpmc750_power_off;
ppc_md.halt = prpmc750_halt;
/* PrPMC750 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 = prpmc750_calibrate_decr;
#ifdef CONFIG_SERIAL_TEXT_DEBUG
ppc_md.progress = gen550_progress;
#endif /* CONFIG_SERIAL_TEXT_DEBUG */
}
Reference in New Issue View Git Blame Copy Permalink