1/*
2 *  config.c - non-mmu 68360 platform initialization code
3 *
4 *  Copyright (c) 2000 Michael Leslie <mleslie@lineo.com>
5 *  Copyright (C) 1993 Hamish Macdonald
6 *  Copyright (C) 1999 D. Jeff Dionne <jeff@uclinux.org>
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License.  See the file COPYING in the main directory of this archive
10 * for more details.
11 */
12
13#include <stdarg.h>
14#include <linux/init.h>
15#include <linux/types.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/interrupt.h>
19#include <linux/irq.h>
20
21#include <asm/setup.h>
22#include <asm/pgtable.h>
23#include <asm/machdep.h>
24#include <asm/m68360.h>
25
26#ifdef CONFIG_UCQUICC
27#include <asm/bootstd.h>
28#endif
29
30extern void m360_cpm_reset(void);
31
32// Mask to select if the PLL prescaler is enabled.
33#define MCU_PREEN   ((unsigned short)(0x0001 << 13))
34
35#if defined(CONFIG_UCQUICC)
36#define OSCILLATOR  (unsigned long int)33000000
37#endif
38
39static irq_handler_t timer_interrupt;
40unsigned long int system_clock;
41
42extern QUICC *pquicc;
43
44/* TODO  DON"T Hard Code this */
45/* calculate properly using the right PLL and prescaller */
46// unsigned int system_clock = 33000000l;
47extern unsigned long int system_clock; //In kernel setup.c
48
49
50static irqreturn_t hw_tick(int irq, void *dummy)
51{
52  /* Reset Timer1 */
53  /* TSTAT &= 0; */
54
55  pquicc->timer_ter1 = 0x0002; /* clear timer event */
56
57  return timer_interrupt(irq, dummy);
58}
59
60static struct irqaction m68360_timer_irq = {
61	.name	 = "timer",
62	.flags	 = IRQF_TIMER,
63	.handler = hw_tick,
64};
65
66void hw_timer_init(irq_handler_t handler)
67{
68  unsigned char prescaler;
69  unsigned short tgcr_save;
70
71#if 0
72  /* Restart mode, Enable int, 32KHz, Enable timer */
73  TCTL = TCTL_OM | TCTL_IRQEN | TCTL_CLKSOURCE_32KHZ | TCTL_TEN;
74  /* Set prescaler (Divide 32KHz by 32)*/
75  TPRER = 31;
76  /* Set compare register  32Khz / 32 / 10 = 100 */
77  TCMP = 10;
78
79  request_irq(IRQ_MACHSPEC | 1, timer_routine, 0, "timer", NULL);
80#endif
81
82  /* General purpose quicc timers: MC68360UM p7-20 */
83
84  /* Set up timer 1 (in [1..4]) to do 100Hz */
85  tgcr_save = pquicc->timer_tgcr & 0xfff0;
86  pquicc->timer_tgcr  = tgcr_save; /* stop and reset timer 1 */
87  /* pquicc->timer_tgcr |= 0x4444; */ /* halt timers when FREEZE (ie bdm freeze) */
88
89  prescaler = 8;
90  pquicc->timer_tmr1 = 0x001a | /* or=1, frr=1, iclk=01b */
91                           (unsigned short)((prescaler - 1) << 8);
92
93  pquicc->timer_tcn1 = 0x0000; /* initial count */
94  /* calculate interval for 100Hz based on the _system_clock: */
95  pquicc->timer_trr1 = (system_clock/ prescaler) / HZ; /* reference count */
96
97  pquicc->timer_ter1 = 0x0003; /* clear timer events */
98
99  timer_interrupt = handler;
100
101  /* enable timer 1 interrupt in CIMR */
102  setup_irq(CPMVEC_TIMER1, &m68360_timer_irq);
103
104  /* Start timer 1: */
105  tgcr_save = (pquicc->timer_tgcr & 0xfff0) | 0x0001;
106  pquicc->timer_tgcr  = tgcr_save;
107}
108
109int BSP_set_clock_mmss(unsigned long nowtime)
110{
111#if 0
112  short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
113
114  tod->second1 = real_seconds / 10;
115  tod->second2 = real_seconds % 10;
116  tod->minute1 = real_minutes / 10;
117  tod->minute2 = real_minutes % 10;
118#endif
119  return 0;
120}
121
122void BSP_reset (void)
123{
124  local_irq_disable();
125  asm volatile (
126    "moveal #_start, %a0;\n"
127    "moveb #0, 0xFFFFF300;\n"
128    "moveal 0(%a0), %sp;\n"
129    "moveal 4(%a0), %a0;\n"
130    "jmp (%a0);\n"
131    );
132}
133
134unsigned char *scc1_hwaddr;
135static int errno;
136
137#if defined (CONFIG_UCQUICC)
138_bsc0(char *, getserialnum)
139_bsc1(unsigned char *, gethwaddr, int, a)
140_bsc1(char *, getbenv, char *, a)
141#endif
142
143
144void __init config_BSP(char *command, int len)
145{
146  unsigned char *p;
147
148  m360_cpm_reset();
149
150  /* Calculate the real system clock value. */
151  {
152     unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr);
153     if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128
154     {
155         int mf = (int)(pquicc->sim_pllcr & 0x0fff);
156         system_clock = (OSCILLATOR / 128) * (mf + 1);
157     }
158     else
159     {
160         int mf = (int)(pquicc->sim_pllcr & 0x0fff);
161         system_clock = (OSCILLATOR) * (mf + 1);
162     }
163  }
164
165  printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n");
166
167#if defined(CONFIG_UCQUICC) && 0
168  printk(KERN_INFO "uCquicc serial string [%s]\n",getserialnum());
169  p = scc1_hwaddr = gethwaddr(0);
170  printk(KERN_INFO "uCquicc hwaddr %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
171         p[0], p[1], p[2], p[3], p[4], p[5]);
172
173  p = getbenv("APPEND");
174  if (p)
175    strcpy(p,command);
176  else
177    command[0] = 0;
178#else
179  scc1_hwaddr = "\00\01\02\03\04\05";
180#endif
181
182  mach_reset = BSP_reset;
183}
184