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linux-stable/arch/ppc/platforms/prpmc800.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-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!
2005-04-16 15:20:36 -07:00

477 lines
14 KiB
C
Raw Blame History

/*
* arch/ppc/platforms/prpmc800.c
*
* Author: Dale Farnsworth <dale.farnsworth@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/harrier_defs.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 <asm/pci-bridge.h>
#include <asm/open_pic.h>
#include <asm/bootinfo.h>
#include <asm/harrier.h>
#include "prpmc800.h"
#define HARRIER_REVI_REG (PRPMC800_HARRIER_XCSR_BASE+HARRIER_REVI_OFF)
#define HARRIER_UCTL_REG (PRPMC800_HARRIER_XCSR_BASE+HARRIER_UCTL_OFF)
#define HARRIER_MISC_CSR_REG (PRPMC800_HARRIER_XCSR_BASE+HARRIER_MISC_CSR_OFF)
#define HARRIER_IFEVP_REG (PRPMC800_HARRIER_MPIC_BASE+HARRIER_MPIC_IFEVP_OFF)
#define HARRIER_IFEDE_REG (PRPMC800_HARRIER_MPIC_BASE+HARRIER_MPIC_IFEDE_OFF)
#define HARRIER_FEEN_REG (PRPMC800_HARRIER_XCSR_BASE+HARRIER_FEEN_OFF)
#define HARRIER_FEMA_REG (PRPMC800_HARRIER_XCSR_BASE+HARRIER_FEMA_OFF)
#define HARRIER_VENI_REG (PRPMC800_HARRIER_XCSR_BASE + HARRIER_VENI_OFF)
#define HARRIER_MISC_CSR (PRPMC800_HARRIER_XCSR_BASE + \
HARRIER_MISC_CSR_OFF)
#define MONARCH (monarch != 0)
#define NON_MONARCH (monarch == 0)
extern int mpic_init(void);
extern unsigned long loops_per_jiffy;
extern void gen550_progress(char *, unsigned short);
static int monarch = 0;
static int found_self = 0;
static int self = 0;
static u_char prpmc800_openpic_initsenses[] __initdata =
{
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_HOSTINT0 */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_UNUSED */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_DEBUGINT */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_HARRIER_WDT */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_UNUSED */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_UNUSED */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_HOSTINT1 */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_HOSTINT2 */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_HOSTINT3 */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_PMC_INTA */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_PMC_INTB */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_PMC_INTC */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_PMC_INTD */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_UNUSED */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_UNUSED */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_UNUSED */
(IRQ_SENSE_LEVEL | IRQ_POLARITY_NEGATIVE), /* PRPMC800_INT_HARRIER_INT (UARTS, ABORT, DMA) */
};
/*
* 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 int
prpmc_read_config_dword(struct pci_controller *hose, u8 bus, u8 devfn,
int offset, u32 * val)
{
/* paranoia */
if ((hose == NULL) ||
(hose->cfg_addr == NULL) || (hose->cfg_data == NULL))
return PCIBIOS_DEVICE_NOT_FOUND;
out_be32(hose->cfg_addr, ((offset & 0xfc) << 24) | (devfn << 16)
| ((bus - hose->bus_offset) << 8) | 0x80);
*val = in_le32((u32 *) (hose->cfg_data + (offset & 3)));
return PCIBIOS_SUCCESSFUL;
}
#define HARRIER_PCI_VEND_DEV_ID (PCI_VENDOR_ID_MOTOROLA | \
(PCI_DEVICE_ID_MOTOROLA_HARRIER << 16))
static int prpmc_self(u8 bus, u8 devfn)
{
/*
* Harriers always view themselves as being on bus 0. If we're not
* looking at bus 0, we're not going to find ourselves.
*/
if (bus != 0)
return PCIBIOS_DEVICE_NOT_FOUND;
else {
int result;
int val;
struct pci_controller *hose;
hose = pci_bus_to_hose(bus);
/* See if target device is a Harrier */
result = prpmc_read_config_dword(hose, bus, devfn,
PCI_VENDOR_ID, &val);
if ((result != PCIBIOS_SUCCESSFUL) ||
(val != HARRIER_PCI_VEND_DEV_ID))
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* LBA bit is set if target Harrier == initiating Harrier
* (i.e. if we are reading our own PCI header).
*/
result = prpmc_read_config_dword(hose, bus, devfn,
HARRIER_LBA_OFF, &val);
if ((result != PCIBIOS_SUCCESSFUL) ||
((val & HARRIER_LBA_MSK) != HARRIER_LBA_MSK))
return PCIBIOS_DEVICE_NOT_FOUND;
/* It's us, save our location for later */
self = devfn;
found_self = 1;
return PCIBIOS_SUCCESSFUL;
}
}
static int prpmc_exclude_device(u8 bus, u8 devfn)
{
/*
* Monarch is allowed to access all PCI devices. Non-monarch is
* only allowed to access its own Harrier.
*/
if (MONARCH)
return PCIBIOS_SUCCESSFUL;
if (found_self)
if ((bus == 0) && (devfn == self))
return PCIBIOS_SUCCESSFUL;
else
return PCIBIOS_DEVICE_NOT_FOUND;
else
return prpmc_self(bus, devfn);
}
void __init prpmc800_find_bridges(void)
{
struct pci_controller *hose;
int host_bridge;
hose = pcibios_alloc_controller();
if (!hose)
return;
hose->first_busno = 0;
hose->last_busno = 0xff;
ppc_md.pci_exclude_device = prpmc_exclude_device;
ppc_md.pcibios_fixup = NULL;
ppc_md.pcibios_fixup_bus = NULL;
ppc_md.pci_swizzle = common_swizzle;
ppc_md.pci_map_irq = prpmc_map_irq;
setup_indirect_pci(hose,
PRPMC800_PCI_CONFIG_ADDR, PRPMC800_PCI_CONFIG_DATA);
/* Get host bridge vendor/dev id */
host_bridge = in_be32((uint *) (HARRIER_VENI_REG));
if (host_bridge != HARRIER_VEND_DEV_ID) {
printk(KERN_CRIT "Host bridge 0x%x not supported\n",
host_bridge);
return;
}
monarch = in_be32((uint *) HARRIER_MISC_CSR) & HARRIER_SYSCON;
printk(KERN_INFO "Running as %s.\n",
MONARCH ? "Monarch" : "Non-Monarch");
hose->io_space.start = PRPMC800_PCI_IO_START;
hose->io_space.end = PRPMC800_PCI_IO_END;
hose->io_base_virt = (void *)PRPMC800_ISA_IO_BASE;
hose->pci_mem_offset = PRPMC800_PCI_PHY_MEM_OFFSET;
pci_init_resource(&hose->io_resource,
PRPMC800_PCI_IO_START, PRPMC800_PCI_IO_END,
IORESOURCE_IO, "PCI host bridge");
if (MONARCH) {
hose->mem_space.start = PRPMC800_PCI_MEM_START;
hose->mem_space.end = PRPMC800_PCI_MEM_END;
pci_init_resource(&hose->mem_resources[0],
PRPMC800_PCI_MEM_START,
PRPMC800_PCI_MEM_END,
IORESOURCE_MEM, "PCI host bridge");
if (harrier_init(hose,
PRPMC800_HARRIER_XCSR_BASE,
PRPMC800_PROC_PCI_MEM_START,
PRPMC800_PROC_PCI_MEM_END,
PRPMC800_PROC_PCI_IO_START,
PRPMC800_PROC_PCI_IO_END,
PRPMC800_HARRIER_MPIC_BASE) != 0)
printk(KERN_CRIT "Could not initialize HARRIER "
"bridge\n");
harrier_release_eready(PRPMC800_HARRIER_XCSR_BASE);
harrier_wait_eready(PRPMC800_HARRIER_XCSR_BASE);
hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
} else {
pci_init_resource(&hose->mem_resources[0],
PRPMC800_NM_PCI_MEM_START,
PRPMC800_NM_PCI_MEM_END,
IORESOURCE_MEM, "PCI host bridge");
hose->mem_space.start = PRPMC800_NM_PCI_MEM_START;
hose->mem_space.end = PRPMC800_NM_PCI_MEM_END;
if (harrier_init(hose,
PRPMC800_HARRIER_XCSR_BASE,
PRPMC800_NM_PROC_PCI_MEM_START,
PRPMC800_NM_PROC_PCI_MEM_END,
PRPMC800_PROC_PCI_IO_START,
PRPMC800_PROC_PCI_IO_END,
PRPMC800_HARRIER_MPIC_BASE) != 0)
printk(KERN_CRIT "Could not initialize HARRIER "
"bridge\n");
harrier_setup_nonmonarch(PRPMC800_HARRIER_XCSR_BASE,
HARRIER_ITSZ_1MB);
harrier_release_eready(PRPMC800_HARRIER_XCSR_BASE);
}
}
static int prpmc800_show_cpuinfo(struct seq_file *m)
{
seq_printf(m, "machine\t\t: PrPMC800\n");
return 0;
}
static void __init prpmc800_setup_arch(void)
{
/* init to some ~sane value until calibrate_delay() runs */
loops_per_jiffy = 50000000 / HZ;
/* Lookup PCI host bridges */
prpmc800_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(KERN_INFO "Port by MontaVista Software, Inc. "
"(source@mvista.com)\n");
}
/*
* Compute the PrPMC800's tbl frequency using the baud clock as a reference.
*/
static void __init prpmc800_calibrate_decr(void)
{
unsigned long tbl_start, tbl_end;
unsigned long current_state, old_state, tb_ticks_per_second;
unsigned int count;
unsigned int harrier_revision;
harrier_revision = readb(HARRIER_REVI_REG);
if (harrier_revision < 2) {
/* XTAL64 was broken in harrier revision 1 */
printk(KERN_INFO "time_init: Harrier revision %d, assuming "
"100 Mhz bus\n", harrier_revision);
tb_ticks_per_second = 100000000 / 4;
tb_ticks_per_jiffy = tb_ticks_per_second / HZ;
tb_to_us = mulhwu_scale_factor(tb_ticks_per_second, 1000000);
return;
}
/*
* The XTAL64 bit oscillates at the 1/64 the base baud clock
* Set count to XTAL64 cycles per second. Since we'll count
* half-cycles, we'll reach the count in half a second.
*/
count = PRPMC800_BASE_BAUD / 64;
/* Find the first edge of the baud clock */
old_state = readb(HARRIER_UCTL_REG) & HARRIER_XTAL64_MASK;
do {
current_state = readb(HARRIER_UCTL_REG) & HARRIER_XTAL64_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 (half-cycles)
* equal to the count (half a second)
*/
do {
do {
current_state = readb(HARRIER_UCTL_REG) &
HARRIER_XTAL64_MASK;
} while (old_state == current_state);
old_state = current_state;
} while (--count);
/* Get the ending time base value */
tbl_end = get_tbl();
/* We only counted for half a second, so double to get ticks/second */
tb_ticks_per_second = (tbl_end - tbl_start) * 2;
tb_ticks_per_jiffy = tb_ticks_per_second / HZ;
tb_to_us = mulhwu_scale_factor(tb_ticks_per_second, 1000000);
}
static void prpmc800_restart(char *cmd)
{
ulong temp;
local_irq_disable();
temp = in_be32((uint *) HARRIER_MISC_CSR_REG);
temp |= HARRIER_RSTOUT;
out_be32((uint *) HARRIER_MISC_CSR_REG, temp);
while (1) ;
}
static void prpmc800_halt(void)
{
local_irq_disable();
while (1) ;
}
static void prpmc800_power_off(void)
{
prpmc800_halt();
}
static void __init prpmc800_init_IRQ(void)
{
OpenPIC_InitSenses = prpmc800_openpic_initsenses;
OpenPIC_NumInitSenses = sizeof(prpmc800_openpic_initsenses);
/* Setup external interrupt sources. */
openpic_set_sources(0, 16, OpenPIC_Addr + 0x10000);
/* Setup internal UART interrupt source. */
openpic_set_sources(16, 1, OpenPIC_Addr + 0x10200);
/* Do the MPIC initialization based on the above settings. */
openpic_init(0);
/* enable functional exceptions for uarts and abort */
out_8((u8 *) HARRIER_FEEN_REG, (HARRIER_FE_UA0 | HARRIER_FE_UA1));
out_8((u8 *) HARRIER_FEMA_REG, ~(HARRIER_FE_UA0 | HARRIER_FE_UA1));
}
/*
* Set BAT 3 to map 0xf0000000 to end of physical memory space.
*/
static __inline__ void prpmc800_set_bat(void)
{
mb();
mtspr(SPRN_DBAT1U, 0xf0001ffe);
mtspr(SPRN_DBAT1L, 0xf000002a);
mb();
}
/*
* We need to read the Harrier memory controller
* to properly determine this value
*/
static unsigned long __init prpmc800_find_end_of_memory(void)
{
/* Read the memory size from the Harrier XCSR */
return harrier_get_mem_size(PRPMC800_HARRIER_XCSR_BASE);
}
static void __init prpmc800_map_io(void)
{
io_block_mapping(0x80000000, 0x80000000, 0x10000000, _PAGE_IO);
io_block_mapping(0xf0000000, 0xf0000000, 0x10000000, _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());
prpmc800_set_bat();
isa_io_base = PRPMC800_ISA_IO_BASE;
isa_mem_base = PRPMC800_ISA_MEM_BASE;
pci_dram_offset = PRPMC800_PCI_DRAM_OFFSET;
ppc_md.setup_arch = prpmc800_setup_arch;
ppc_md.show_cpuinfo = prpmc800_show_cpuinfo;
ppc_md.init_IRQ = prpmc800_init_IRQ;
ppc_md.get_irq = openpic_get_irq;
ppc_md.find_end_of_memory = prpmc800_find_end_of_memory;
ppc_md.setup_io_mappings = prpmc800_map_io;
ppc_md.restart = prpmc800_restart;
ppc_md.power_off = prpmc800_power_off;
ppc_md.halt = prpmc800_halt;
/* PrPMC800 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 = prpmc800_calibrate_decr;
#ifdef CONFIG_SERIAL_TEXT_DEBUG
ppc_md.progress = gen550_progress;
#else /* !CONFIG_SERIAL_TEXT_DEBUG */
ppc_md.progress = NULL;
#endif /* CONFIG_SERIAL_TEXT_DEBUG */
}
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