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