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Diffstat (limited to 'arch/m68k/68360/config.c')
| -rw-r--r-- | arch/m68k/68360/config.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/arch/m68k/68360/config.c b/arch/m68k/68360/config.c new file mode 100644 index 000000000..fd1f948c7 --- /dev/null +++ b/arch/m68k/68360/config.c @@ -0,0 +1,170 @@ +/* + * config.c - non-mmu 68360 platform initialization code + * + * Copyright (c) 2000 Michael Leslie <mleslie@lineo.com> + * Copyright (C) 1993 Hamish Macdonald + * Copyright (C) 1999 D. Jeff Dionne <jeff@uclinux.org> + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include <stdarg.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/irq.h> + +#include <asm/setup.h> +#include <asm/pgtable.h> +#include <asm/machdep.h> +#include <asm/m68360.h> + +#ifdef CONFIG_UCQUICC +#include <asm/bootstd.h> +#endif + +extern void m360_cpm_reset(void); + +// Mask to select if the PLL prescaler is enabled. +#define MCU_PREEN ((unsigned short)(0x0001 << 13)) + +#if defined(CONFIG_UCQUICC) +#define OSCILLATOR (unsigned long int)33000000 +#endif + +static irq_handler_t timer_interrupt; +unsigned long int system_clock; + +extern QUICC *pquicc; + +/* TODO DON"T Hard Code this */ +/* calculate properly using the right PLL and prescaller */ +// unsigned int system_clock = 33000000l; +extern unsigned long int system_clock; //In kernel setup.c + + +static irqreturn_t hw_tick(int irq, void *dummy) +{ + /* Reset Timer1 */ + /* TSTAT &= 0; */ + + pquicc->timer_ter1 = 0x0002; /* clear timer event */ + + return timer_interrupt(irq, dummy); +} + +static struct irqaction m68360_timer_irq = { + .name = "timer", + .flags = IRQF_TIMER, + .handler = hw_tick, +}; + +void hw_timer_init(irq_handler_t handler) +{ + unsigned char prescaler; + unsigned short tgcr_save; + +#if 0 + /* Restart mode, Enable int, 32KHz, Enable timer */ + TCTL = TCTL_OM | TCTL_IRQEN | TCTL_CLKSOURCE_32KHZ | TCTL_TEN; + /* Set prescaler (Divide 32KHz by 32)*/ + TPRER = 31; + /* Set compare register 32Khz / 32 / 10 = 100 */ + TCMP = 10; + + request_irq(IRQ_MACHSPEC | 1, timer_routine, 0, "timer", NULL); +#endif + + /* General purpose quicc timers: MC68360UM p7-20 */ + + /* Set up timer 1 (in [1..4]) to do 100Hz */ + tgcr_save = pquicc->timer_tgcr & 0xfff0; + pquicc->timer_tgcr = tgcr_save; /* stop and reset timer 1 */ + /* pquicc->timer_tgcr |= 0x4444; */ /* halt timers when FREEZE (ie bdm freeze) */ + + prescaler = 8; + pquicc->timer_tmr1 = 0x001a | /* or=1, frr=1, iclk=01b */ + (unsigned short)((prescaler - 1) << 8); + + pquicc->timer_tcn1 = 0x0000; /* initial count */ + /* calculate interval for 100Hz based on the _system_clock: */ + pquicc->timer_trr1 = (system_clock/ prescaler) / HZ; /* reference count */ + + pquicc->timer_ter1 = 0x0003; /* clear timer events */ + + timer_interrupt = handler; + + /* enable timer 1 interrupt in CIMR */ + setup_irq(CPMVEC_TIMER1, &m68360_timer_irq); + + /* Start timer 1: */ + tgcr_save = (pquicc->timer_tgcr & 0xfff0) | 0x0001; + pquicc->timer_tgcr = tgcr_save; +} + +void BSP_reset (void) +{ + local_irq_disable(); + asm volatile ( + "moveal #_start, %a0;\n" + "moveb #0, 0xFFFFF300;\n" + "moveal 0(%a0), %sp;\n" + "moveal 4(%a0), %a0;\n" + "jmp (%a0);\n" + ); +} + +unsigned char *scc1_hwaddr; +static int errno; + +#if defined (CONFIG_UCQUICC) +_bsc0(char *, getserialnum) +_bsc1(unsigned char *, gethwaddr, int, a) +_bsc1(char *, getbenv, char *, a) +#endif + + +void __init config_BSP(char *command, int len) +{ + unsigned char *p; + + m360_cpm_reset(); + + /* Calculate the real system clock value. */ + { + unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr); + if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128 + { + int mf = (int)(pquicc->sim_pllcr & 0x0fff); + system_clock = (OSCILLATOR / 128) * (mf + 1); + } + else + { + int mf = (int)(pquicc->sim_pllcr & 0x0fff); + system_clock = (OSCILLATOR) * (mf + 1); + } + } + + printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n"); + +#if defined(CONFIG_UCQUICC) && 0 + printk(KERN_INFO "uCquicc serial string [%s]\n",getserialnum()); + p = scc1_hwaddr = gethwaddr(0); + printk(KERN_INFO "uCquicc hwaddr %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n", + p[0], p[1], p[2], p[3], p[4], p[5]); + + p = getbenv("APPEND"); + if (p) + strcpy(p,command); + else + command[0] = 0; +#else + scc1_hwaddr = "\00\01\02\03\04\05"; +#endif + + mach_reset = BSP_reset; +} |