1 /*
2 * linux/arch/m68knommu/platform/68360/config.c
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/types.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/interrupt.h>
18 #include <linux/irq.h>
19
20 #include <asm/setup.h>
21 #include <asm/system.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
30 extern 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
39 unsigned long int system_clock;
40
41 extern QUICC *pquicc;
42
43 /* TODO DON"T Hard Code this */
44 /* calculate properly using the right PLL and prescaller */
45 // unsigned int system_clock = 33000000l;
46 extern unsigned long int system_clock; //In kernel setup.c
47
48
hw_tick(int irq,void * dummy)49 static irqreturn_t hw_tick(int irq, void *dummy)
50 {
51 /* Reset Timer1 */
52 /* TSTAT &= 0; */
53
54 pquicc->timer_ter1 = 0x0002; /* clear timer event */
55
56 return arch_timer_interrupt(irq, dummy);
57 }
58
59 static struct irqaction m68360_timer_irq = {
60 .name = "timer",
61 .flags = IRQF_DISABLED | IRQF_TIMER,
62 .handler = hw_tick,
63 };
64
hw_timer_init(void)65 void hw_timer_init(void)
66 {
67 unsigned char prescaler;
68 unsigned short tgcr_save;
69
70 #if 0
71 /* Restart mode, Enable int, 32KHz, Enable timer */
72 TCTL = TCTL_OM | TCTL_IRQEN | TCTL_CLKSOURCE_32KHZ | TCTL_TEN;
73 /* Set prescaler (Divide 32KHz by 32)*/
74 TPRER = 31;
75 /* Set compare register 32Khz / 32 / 10 = 100 */
76 TCMP = 10;
77
78 request_irq(IRQ_MACHSPEC | 1, timer_routine, 0, "timer", NULL);
79 #endif
80
81 /* General purpose quicc timers: MC68360UM p7-20 */
82
83 /* Set up timer 1 (in [1..4]) to do 100Hz */
84 tgcr_save = pquicc->timer_tgcr & 0xfff0;
85 pquicc->timer_tgcr = tgcr_save; /* stop and reset timer 1 */
86 /* pquicc->timer_tgcr |= 0x4444; */ /* halt timers when FREEZE (ie bdm freeze) */
87
88 prescaler = 8;
89 pquicc->timer_tmr1 = 0x001a | /* or=1, frr=1, iclk=01b */
90 (unsigned short)((prescaler - 1) << 8);
91
92 pquicc->timer_tcn1 = 0x0000; /* initial count */
93 /* calculate interval for 100Hz based on the _system_clock: */
94 pquicc->timer_trr1 = (system_clock/ prescaler) / HZ; /* reference count */
95
96 pquicc->timer_ter1 = 0x0003; /* clear timer events */
97
98 /* enable timer 1 interrupt in CIMR */
99 setup_irq(CPMVEC_TIMER1, &m68360_timer_irq);
100
101 /* Start timer 1: */
102 tgcr_save = (pquicc->timer_tgcr & 0xfff0) | 0x0001;
103 pquicc->timer_tgcr = tgcr_save;
104 }
105
BSP_gettod(int * yearp,int * monp,int * dayp,int * hourp,int * minp,int * secp)106 void BSP_gettod (int *yearp, int *monp, int *dayp,
107 int *hourp, int *minp, int *secp)
108 {
109 }
110
BSP_set_clock_mmss(unsigned long nowtime)111 int BSP_set_clock_mmss(unsigned long nowtime)
112 {
113 #if 0
114 short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
115
116 tod->second1 = real_seconds / 10;
117 tod->second2 = real_seconds % 10;
118 tod->minute1 = real_minutes / 10;
119 tod->minute2 = real_minutes % 10;
120 #endif
121 return 0;
122 }
123
BSP_reset(void)124 void BSP_reset (void)
125 {
126 local_irq_disable();
127 asm volatile (
128 "moveal #_start, %a0;\n"
129 "moveb #0, 0xFFFFF300;\n"
130 "moveal 0(%a0), %sp;\n"
131 "moveal 4(%a0), %a0;\n"
132 "jmp (%a0);\n"
133 );
134 }
135
136 unsigned char *scc1_hwaddr;
137 static int errno;
138
139 #if defined (CONFIG_UCQUICC)
_bsc0(char *,getserialnum)140 _bsc0(char *, getserialnum)
141 _bsc1(unsigned char *, gethwaddr, int, a)
142 _bsc1(char *, getbenv, char *, a)
143 #endif
144
145
146 void config_BSP(char *command, int len)
147 {
148 unsigned char *p;
149
150 m360_cpm_reset();
151
152 /* Calculate the real system clock value. */
153 {
154 unsigned int local_pllcr = (unsigned int)(pquicc->sim_pllcr);
155 if( local_pllcr & MCU_PREEN ) // If the prescaler is dividing by 128
156 {
157 int mf = (int)(pquicc->sim_pllcr & 0x0fff);
158 system_clock = (OSCILLATOR / 128) * (mf + 1);
159 }
160 else
161 {
162 int mf = (int)(pquicc->sim_pllcr & 0x0fff);
163 system_clock = (OSCILLATOR) * (mf + 1);
164 }
165 }
166
167 printk(KERN_INFO "\n68360 QUICC support (C) 2000 Lineo Inc.\n");
168
169 #if defined(CONFIG_UCQUICC) && 0
170 printk(KERN_INFO "uCquicc serial string [%s]\n",getserialnum());
171 p = scc1_hwaddr = gethwaddr(0);
172 printk(KERN_INFO "uCquicc hwaddr %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
173 p[0], p[1], p[2], p[3], p[4], p[5]);
174
175 p = getbenv("APPEND");
176 if (p)
177 strcpy(p,command);
178 else
179 command[0] = 0;
180 #else
181 scc1_hwaddr = "\00\01\02\03\04\05";
182 #endif
183
184 mach_gettod = BSP_gettod;
185 mach_reset = BSP_reset;
186 }
187