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Vitaly Bordugdf344032007-01-24 22:41:42 +03001/*
2 * Copyright (C) 1995 Linus Torvalds
3 * Adapted from 'alpha' version by Gary Thomas
4 * Modified by Cort Dougan (cort@cs.nmt.edu)
5 * Modified for MBX using prep/chrp/pmac functions by Dan (dmalek@jlc.net)
6 * Further modified for generic 8xx by Dan.
7 */
8
9/*
10 * bootup setup stuff..
11 */
12
Vitaly Bordugdf344032007-01-24 22:41:42 +030013#include <linux/kernel.h>
Vitaly Bordugdf344032007-01-24 22:41:42 +030014#include <linux/slab.h>
Vitaly Bordugdf344032007-01-24 22:41:42 +030015#include <linux/interrupt.h>
Vitaly Bordugdf344032007-01-24 22:41:42 +030016#include <linux/init.h>
Vitaly Bordugdf344032007-01-24 22:41:42 +030017#include <linux/time.h>
18#include <linux/rtc.h>
Jochen Friedrich02753cb2008-01-24 16:19:01 +010019#include <linux/fsl_devices.h>
Vitaly Bordugdf344032007-01-24 22:41:42 +030020
Vitaly Bordugdf344032007-01-24 22:41:42 +030021#include <asm/io.h>
Vitaly Bordugdf344032007-01-24 22:41:42 +030022#include <asm/mpc8xx.h>
23#include <asm/8xx_immap.h>
Vitaly Bordugdf344032007-01-24 22:41:42 +030024#include <asm/prom.h>
25#include <asm/fs_pd.h>
26#include <mm/mmu_decl.h>
27
Scott Woodfb533d02007-09-14 14:22:36 -050028#include <sysdev/mpc8xx_pic.h>
Jochen Friedrich49b51542008-01-24 16:18:32 +010029
30#include "mpc8xx.h"
Vitaly Bordugdf344032007-01-24 22:41:42 +030031
Vitaly Bordug80128ff2007-07-09 11:37:35 -070032struct mpc8xx_pcmcia_ops m8xx_pcmcia_ops;
Vitaly Bordug80128ff2007-07-09 11:37:35 -070033
Vitaly Bordugdf344032007-01-24 22:41:42 +030034extern int cpm_pic_init(void);
35extern int cpm_get_irq(void);
36
37/* A place holder for time base interrupts, if they are ever enabled. */
Scott Woodfb533d02007-09-14 14:22:36 -050038static irqreturn_t timebase_interrupt(int irq, void *dev)
Vitaly Bordugdf344032007-01-24 22:41:42 +030039{
40 printk ("timebase_interrupt()\n");
41
42 return IRQ_HANDLED;
43}
44
45static struct irqaction tbint_irqaction = {
46 .handler = timebase_interrupt,
47 .mask = CPU_MASK_NONE,
48 .name = "tbint",
49};
50
51/* per-board overridable init_internal_rtc() function. */
52void __init __attribute__ ((weak))
53init_internal_rtc(void)
54{
Scott Woodfb533d02007-09-14 14:22:36 -050055 sit8xx_t __iomem *sys_tmr = immr_map(im_sit);
Vitaly Bordugdf344032007-01-24 22:41:42 +030056
57 /* Disable the RTC one second and alarm interrupts. */
58 clrbits16(&sys_tmr->sit_rtcsc, (RTCSC_SIE | RTCSC_ALE));
59
60 /* Enable the RTC */
61 setbits16(&sys_tmr->sit_rtcsc, (RTCSC_RTF | RTCSC_RTE));
62 immr_unmap(sys_tmr);
63}
64
65static int __init get_freq(char *name, unsigned long *val)
66{
Scott Wood4b218e92007-08-21 02:36:19 +100067 struct device_node *cpu;
68 const unsigned int *fp;
69 int found = 0;
Vitaly Bordugdf344032007-01-24 22:41:42 +030070
Scott Wood4b218e92007-08-21 02:36:19 +100071 /* The cpu node should have timebase and clock frequency properties */
72 cpu = of_find_node_by_type(NULL, "cpu");
Vitaly Bordugdf344032007-01-24 22:41:42 +030073
Scott Wood4b218e92007-08-21 02:36:19 +100074 if (cpu) {
75 fp = of_get_property(cpu, name, NULL);
76 if (fp) {
77 found = 1;
78 *val = *fp;
79 }
Vitaly Bordugdf344032007-01-24 22:41:42 +030080
Scott Wood4b218e92007-08-21 02:36:19 +100081 of_node_put(cpu);
82 }
Vitaly Bordugdf344032007-01-24 22:41:42 +030083
Scott Wood4b218e92007-08-21 02:36:19 +100084 return found;
Vitaly Bordugdf344032007-01-24 22:41:42 +030085}
86
87/* The decrementer counts at the system (internal) clock frequency divided by
88 * sixteen, or external oscillator divided by four. We force the processor
89 * to use system clock divided by sixteen.
90 */
91void __init mpc8xx_calibrate_decr(void)
92{
93 struct device_node *cpu;
Scott Woodfb533d02007-09-14 14:22:36 -050094 cark8xx_t __iomem *clk_r1;
95 car8xx_t __iomem *clk_r2;
96 sitk8xx_t __iomem *sys_tmr1;
97 sit8xx_t __iomem *sys_tmr2;
Vitaly Bordugdf344032007-01-24 22:41:42 +030098 int irq, virq;
99
Scott Woodfb533d02007-09-14 14:22:36 -0500100 clk_r1 = immr_map(im_clkrstk);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300101
102 /* Unlock the SCCR. */
103 out_be32(&clk_r1->cark_sccrk, ~KAPWR_KEY);
104 out_be32(&clk_r1->cark_sccrk, KAPWR_KEY);
105 immr_unmap(clk_r1);
106
107 /* Force all 8xx processors to use divide by 16 processor clock. */
Scott Woodfb533d02007-09-14 14:22:36 -0500108 clk_r2 = immr_map(im_clkrst);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300109 setbits32(&clk_r2->car_sccr, 0x02000000);
110 immr_unmap(clk_r2);
111
112 /* Processor frequency is MHz.
113 */
Scott Wood4b218e92007-08-21 02:36:19 +1000114 ppc_tb_freq = 50000000;
115 if (!get_freq("bus-frequency", &ppc_tb_freq)) {
116 printk(KERN_ERR "WARNING: Estimating decrementer frequency "
117 "(not found)\n");
118 }
119 ppc_tb_freq /= 16;
120 ppc_proc_freq = 50000000;
121 if (!get_freq("clock-frequency", &ppc_proc_freq))
joe@perches.comdf3c9012007-11-20 12:47:55 +1100122 printk(KERN_ERR "WARNING: Estimating processor frequency "
Scott Wood4b218e92007-08-21 02:36:19 +1000123 "(not found)\n");
Vitaly Bordugdf344032007-01-24 22:41:42 +0300124
Scott Wood4b218e92007-08-21 02:36:19 +1000125 printk("Decrementer Frequency = 0x%lx\n", ppc_tb_freq);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300126
127 /* Perform some more timer/timebase initialization. This used
128 * to be done elsewhere, but other changes caused it to get
129 * called more than once....that is a bad thing.
130 *
131 * First, unlock all of the registers we are going to modify.
132 * To protect them from corruption during power down, registers
133 * that are maintained by keep alive power are "locked". To
134 * modify these registers we have to write the key value to
135 * the key location associated with the register.
136 * Some boards power up with these unlocked, while others
137 * are locked. Writing anything (including the unlock code?)
138 * to the unlocked registers will lock them again. So, here
139 * we guarantee the registers are locked, then we unlock them
140 * for our use.
141 */
Scott Woodfb533d02007-09-14 14:22:36 -0500142 sys_tmr1 = immr_map(im_sitk);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300143 out_be32(&sys_tmr1->sitk_tbscrk, ~KAPWR_KEY);
144 out_be32(&sys_tmr1->sitk_rtcsck, ~KAPWR_KEY);
145 out_be32(&sys_tmr1->sitk_tbk, ~KAPWR_KEY);
146 out_be32(&sys_tmr1->sitk_tbscrk, KAPWR_KEY);
147 out_be32(&sys_tmr1->sitk_rtcsck, KAPWR_KEY);
148 out_be32(&sys_tmr1->sitk_tbk, KAPWR_KEY);
149 immr_unmap(sys_tmr1);
150
151 init_internal_rtc();
152
153 /* Enabling the decrementer also enables the timebase interrupts
154 * (or from the other point of view, to get decrementer interrupts
155 * we have to enable the timebase). The decrementer interrupt
156 * is wired into the vector table, nothing to do here for that.
157 */
Scott Wood4b218e92007-08-21 02:36:19 +1000158 cpu = of_find_node_by_type(NULL, "cpu");
159 virq= irq_of_parse_and_map(cpu, 0);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300160 irq = irq_map[virq].hwirq;
161
Scott Woodfb533d02007-09-14 14:22:36 -0500162 sys_tmr2 = immr_map(im_sit);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300163 out_be16(&sys_tmr2->sit_tbscr, ((1 << (7 - (irq/2))) << 8) |
164 (TBSCR_TBF | TBSCR_TBE));
165 immr_unmap(sys_tmr2);
166
167 if (setup_irq(virq, &tbint_irqaction))
168 panic("Could not allocate timer IRQ!");
Vitaly Bordugdf344032007-01-24 22:41:42 +0300169}
170
171/* The RTC on the MPC8xx is an internal register.
172 * We want to protect this during power down, so we need to unlock,
173 * modify, and re-lock.
174 */
175
176int mpc8xx_set_rtc_time(struct rtc_time *tm)
177{
Scott Woodfb533d02007-09-14 14:22:36 -0500178 sitk8xx_t __iomem *sys_tmr1;
179 sit8xx_t __iomem *sys_tmr2;
Vitaly Bordugdf344032007-01-24 22:41:42 +0300180 int time;
181
Scott Woodfb533d02007-09-14 14:22:36 -0500182 sys_tmr1 = immr_map(im_sitk);
183 sys_tmr2 = immr_map(im_sit);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300184 time = mktime(tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
Scott Wood4b218e92007-08-21 02:36:19 +1000185 tm->tm_hour, tm->tm_min, tm->tm_sec);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300186
187 out_be32(&sys_tmr1->sitk_rtck, KAPWR_KEY);
188 out_be32(&sys_tmr2->sit_rtc, time);
189 out_be32(&sys_tmr1->sitk_rtck, ~KAPWR_KEY);
190
191 immr_unmap(sys_tmr2);
192 immr_unmap(sys_tmr1);
193 return 0;
194}
195
196void mpc8xx_get_rtc_time(struct rtc_time *tm)
197{
198 unsigned long data;
Scott Woodfb533d02007-09-14 14:22:36 -0500199 sit8xx_t __iomem *sys_tmr = immr_map(im_sit);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300200
201 /* Get time from the RTC. */
202 data = in_be32(&sys_tmr->sit_rtc);
203 to_tm(data, tm);
Scott Wood4b218e92007-08-21 02:36:19 +1000204 tm->tm_year -= 1900;
205 tm->tm_mon -= 1;
Vitaly Bordugdf344032007-01-24 22:41:42 +0300206 immr_unmap(sys_tmr);
207 return;
208}
209
210void mpc8xx_restart(char *cmd)
211{
Scott Woodfb533d02007-09-14 14:22:36 -0500212 car8xx_t __iomem *clk_r = immr_map(im_clkrst);
Vitaly Bordugdf344032007-01-24 22:41:42 +0300213
214
215 local_irq_disable();
216
217 setbits32(&clk_r->car_plprcr, 0x00000080);
218 /* Clear the ME bit in MSR to cause checkstop on machine check
219 */
220 mtmsr(mfmsr() & ~0x1000);
221
Scott Woodfb533d02007-09-14 14:22:36 -0500222 in_8(&clk_r->res[0]);
223 panic("Restart failed\n");
Vitaly Bordugdf344032007-01-24 22:41:42 +0300224}
225
226static void cpm_cascade(unsigned int irq, struct irq_desc *desc)
227{
228 int cascade_irq;
229
230 if ((cascade_irq = cpm_get_irq()) >= 0) {
231 struct irq_desc *cdesc = irq_desc + cascade_irq;
232
233 generic_handle_irq(cascade_irq);
234 cdesc->chip->eoi(cascade_irq);
235 }
236 desc->chip->eoi(irq);
237}
238
Jochen Friedrichd0a02a02008-01-24 16:17:32 +0100239/* Initialize the internal interrupt controllers. The number of
Vitaly Bordugdf344032007-01-24 22:41:42 +0300240 * interrupts supported can vary with the processor type, and the
241 * 82xx family can have up to 64.
242 * External interrupts can be either edge or level triggered, and
243 * need to be initialized by the appropriate driver.
244 */
Jochen Friedrichd0a02a02008-01-24 16:17:32 +0100245void __init mpc8xx_pics_init(void)
Vitaly Bordugdf344032007-01-24 22:41:42 +0300246{
247 int irq;
248
249 if (mpc8xx_pic_init()) {
Scott Wood4b218e92007-08-21 02:36:19 +1000250 printk(KERN_ERR "Failed interrupt 8xx controller initialization\n");
Vitaly Bordugdf344032007-01-24 22:41:42 +0300251 return;
252 }
253
254 irq = cpm_pic_init();
255 if (irq != NO_IRQ)
256 set_irq_chained_handler(irq, cpm_cascade);
257}