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
109void BSP_reset (void)
110{
111  local_irq_disable();
112  asm volatile (
113    "moveal #_start, %a0;\n"
114    "moveb #0, 0xFFFFF300;\n"
115    "moveal 0(%a0), %sp;\n"
116    "moveal 4(%a0), %a0;\n"
117    "jmp (%a0);\n"
118    );
119}
120
121unsigned char *scc1_hwaddr;
122static int errno;
123
124#if defined (CONFIG_UCQUICC)
125_bsc0(char *, getserialnum)
126_bsc1(unsigned char *, gethwaddr, int, a)
127_bsc1(char *, getbenv, char *, a)
128#endif
129
130
131void __init config_BSP(char *command, int len)
132{
133  unsigned char *p;
134
135  m360_cpm_reset();
136
137  /* Calculate the real system clock value. */
138  {
139     unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr);
140     if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128
141     {
142         int mf = (int)(pquicc->sim_pllcr & 0x0fff);
143         system_clock = (OSCILLATOR / 128) * (mf + 1);
144     }
145     else
146     {
147         int mf = (int)(pquicc->sim_pllcr & 0x0fff);
148         system_clock = (OSCILLATOR) * (mf + 1);
149     }
150  }
151
152  printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n");
153
154#if defined(CONFIG_UCQUICC) && 0
155  printk(KERN_INFO "uCquicc serial string [%s]\n",getserialnum());
156  p = scc1_hwaddr = gethwaddr(0);
157  printk(KERN_INFO "uCquicc hwaddr %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
158         p[0], p[1], p[2], p[3], p[4], p[5]);
159
160  p = getbenv("APPEND");
161  if (p)
162    strcpy(p,command);
163  else
164    command[0] = 0;
165#else
166  scc1_hwaddr = "\00\01\02\03\04\05";
167#endif
168
169  mach_reset = BSP_reset;
170}
171