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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/m68k/68360/config.c
Initial import
Diffstat (limited to 'arch/m68k/68360/config.c')
-rw-r--r--arch/m68k/68360/config.c170
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;
+}