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Diffstat (limited to 'arch/ppc/kernel/walnut_setup.c')
-rw-r--r-- | arch/ppc/kernel/walnut_setup.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/arch/ppc/kernel/walnut_setup.c b/arch/ppc/kernel/walnut_setup.c new file mode 100644 index 000000000..284c732c1 --- /dev/null +++ b/arch/ppc/kernel/walnut_setup.c @@ -0,0 +1,295 @@ +/* + * + * Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu> + * + * Module name: walnut_setup.c + * + * Description: + * Architecture- / platform-specific boot-time initialization code for + * the IBM PowerPC 403GP "Walnut" evaluation board. Adapted from original + * code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek + * <dan@net4x.com>. + * + */ + +#include <linux/config.h> +#include <linux/init.h> +#include <linux/smp.h> +#include <linux/threads.h> +#include <linux/interrupt.h> +#include <linux/param.h> +#include <linux/string.h> +#include <linux/blk.h> + +#include <asm/processor.h> +#include <asm/board.h> +#include <asm/machdep.h> +#include <asm/page.h> + +#include "local_irq.h" +#include "ppc4xx_pic.h" +#include "time.h" +#include "walnut_setup.h" + + +/* Function Prototypes */ + +extern void abort(void); + +/* Global Variables */ + +unsigned char __res[sizeof(bd_t)]; + + +/* + * void __init walnut_init() + * + * Description: + * This routine... + * + * Input(s): + * r3 - Optional pointer to a board information structure. + * r4 - Optional pointer to the physical starting address of the init RAM + * disk. + * r5 - Optional pointer to the physical ending address of the init RAM + * disk. + * r6 - Optional pointer to the physical starting address of any kernel + * command-line parameters. + * r7 - Optional pointer to the physical ending address of any kernel + * command-line parameters. + * + * Output(s): + * N/A + * + * Returns: + * N/A + * + */ +void __init +walnut_init(unsigned long r3, unsigned long r4, unsigned long r5, + unsigned long r6, unsigned long r7) +{ + /* + * If we were passed in a board information, copy it into the + * residual data area. + */ + if (r3) { + memcpy((void *)__res, (void *)(r3 + KERNELBASE), sizeof(bd_t)); + } + +#if defined(CONFIG_BLK_DEV_INITRD) + /* + * If the init RAM disk has been configured in, and there's a valid + * starting address for it, set it up. + */ + if (r4) { + initrd_start = r4 + KERNELBASE; + initrd_end = r5 + KERNELBASE; + } +#endif /* CONFIG_BLK_DEV_INITRD */ + + /* Copy the kernel command line arguments to a safe place. */ + + if (r6) { + *(char *)(r7 + KERNELBASE) = 0; + strcpy(cmd_line, (char *)(r6 + KERNELBASE)); + } + + /* Initialize machine-dependency vectors */ + + ppc_md.setup_arch = walnut_setup_arch; + ppc_md.setup_residual = walnut_setup_residual; + ppc_md.get_cpuinfo = NULL; + ppc_md.irq_cannonicalize = NULL; + ppc_md.init_IRQ = walnut_init_IRQ; + ppc_md.get_irq = walnut_get_irq; + ppc_md.init = NULL; + + ppc_md.restart = walnut_restart; + ppc_md.power_off = walnut_power_off; + ppc_md.halt = walnut_halt; + + ppc_md.time_init = walnut_time_init; + ppc_md.set_rtc_time = walnut_set_rtc_time; + ppc_md.get_rtc_time = walnut_get_rtc_time; + ppc_md.calibrate_decr = walnut_calibrate_decr; + + ppc_md.kbd_setkeycode = NULL; + ppc_md.kbd_getkeycode = NULL; + ppc_md.kbd_translate = NULL; + ppc_md.kbd_unexpected_up = NULL; + ppc_md.kbd_leds = NULL; + ppc_md.kbd_init_hw = NULL; + +#if defined(CONFIG_MAGIC_SYSRQ) + ppc_md.ppc_kbd_sysrq_xlate = NULL; +#endif + + return; +} + +/* + * Document me. + */ +void __init +walnut_setup_arch(void) +{ + /* XXX - Implement me */ +} + +/* + * int walnut_setup_residual() + * + * Description: + * This routine pretty-prints the platform's internal CPU and bus clock + * frequencies into the buffer for usage in /proc/cpuinfo. + * + * Input(s): + * *buffer - Buffer into which CPU and bus clock frequencies are to be + * printed. + * + * Output(s): + * *buffer - Buffer with the CPU and bus clock frequencies. + * + * Returns: + * The number of bytes copied into 'buffer' if OK, otherwise zero or less + * on error. + */ +int +walnut_setup_residual(char *buffer) +{ + int len = 0; + bd_t *bp = (bd_t *)__res; + + len += sprintf(len + buffer, + "clock\t\t: %dMHz\n" + "bus clock\t\t: %dMHz\n", + bp->bi_intfreq / 1000000, + bp->bi_busfreq / 1000000); + + return (len); +} + +/* + * Document me. + */ +void __init +walnut_init_IRQ(void) +{ + int i; + + ppc4xx_pic_init(); + + for (i = 0; i < NR_IRQS; i++) { + irq_desc[i].handler = ppc4xx_pic; + } + + return; +} + +/* + * Document me. + */ +int +walnut_get_irq(struct pt_regs *regs) +{ + return (ppc4xx_pic_get_irq(regs)); +} + +/* + * Document me. + */ +void +walnut_restart(char *cmd) +{ + abort(); +} + +/* + * Document me. + */ +void +walnut_power_off(void) +{ + walnut_restart(NULL); +} + +/* + * Document me. + */ +void +walnut_halt(void) +{ + walnut_restart(NULL); +} + +/* + * Document me. + */ +void __init +walnut_time_init(void) +{ + /* XXX - Implement me */ +} + +/* + * Document me. + */ +int __init +walnut_set_rtc_time(unsigned long time) +{ + /* XXX - Implement me */ + + return (0); +} + +/* + * Document me. + */ +unsigned long __init +walnut_get_rtc_time(void) +{ + /* XXX - Implement me */ + + return (0); +} + +/* + * void __init walnut_calibrate_decr() + * + * Description: + * This routine retrieves the internal processor frequency from the board + * information structure, sets up the kernel timer decrementer based on + * that value, enables the 403 programmable interval timer (PIT) and sets + * it up for auto-reload. + * + * Input(s): + * N/A + * + * Output(s): + * N/A + * + * Returns: + * N/A + * + */ +void __init +walnut_calibrate_decr(void) +{ + unsigned int freq; + bd_t *bip = (bd_t *)__res; + + freq = bip->bi_intfreq; + + decrementer_count = freq / HZ; + count_period_num = 1; + count_period_den = freq; + + /* Enable the PIT and set auto-reload of its value */ + + mtspr(SPRN_TCR, TCR_PIE | TCR_ARE); + + /* Clear any pending timer interrupts */ + + mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_PIS | TSR_FIS); +} |