2 * Common code for the boards based on Freescale MPC52xx embedded CPU.
5 * Maintainer : Sylvain Munaut <tnt@246tNt.com>
7 * Support for other bootloaders than UBoot by Dale Farnsworth
8 * <dfarnsworth@mvista.com>
10 * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
11 * Copyright (C) 2003 Montavista Software, Inc
13 * This file is licensed under the terms of the GNU General Public License
14 * version 2. This program is licensed "as is" without any warranty of any
15 * kind, whether express or implied.
21 #include <asm/mpc52xx.h>
22 #include <asm/mpc52xx_psc.h>
23 #include <asm/pgtable.h>
24 #include <asm/ppcboot.h>
26 #include <syslib/mpc52xx_pci.h>
30 static int core_mult[] = { /* CPU Frequency multiplier, taken */
31 0, 0, 0, 10, 20, 20, 25, 45, /* from the datasheet used to compute */
32 30, 55, 40, 50, 0, 60, 35, 0, /* CPU frequency from XLB freq and */
33 30, 25, 65, 10, 70, 20, 75, 45, /* external jumper config */
34 0, 55, 40, 50, 80, 60, 35, 0
38 mpc52xx_restart(char *cmd)
40 struct mpc52xx_gpt __iomem *gpt0 = MPC52xx_VA(MPC52xx_GPTx_OFFSET(0));
44 /* Turn on the watchdog and wait for it to expire. It effectively
46 out_be32(&gpt0->count, 0x000000ff);
47 out_be32(&gpt0->mode, 0x00009004);
61 mpc52xx_power_off(void)
63 /* By default we don't have any way of shut down.
64 If a specific board wants to, it can set the power down
65 code to any hardware implementation dependent code */
73 /* Set BAT 2 to map the 0xf0000000 area */
74 /* This mapping is used during mpc52xx_progress,
75 * mpc52xx_find_end_of_memory, and UARTs/GPIO access for debug
78 mtspr(SPRN_DBAT2U, 0xf0001ffe);
79 mtspr(SPRN_DBAT2L, 0xf000002a);
86 /* Here we map the MBAR and the whole upper zone. MBAR is only
87 64k but we can't map only 64k with BATs. Map the whole
88 0xf0000000 range is ok and helps eventual lpb devices placed there */
90 MPC52xx_MBAR_VIRT, MPC52xx_MBAR, 0x10000000, _PAGE_IO);
94 #ifdef CONFIG_SERIAL_TEXT_DEBUG
95 #ifndef MPC52xx_PF_CONSOLE_PORT
96 #error "mpc52xx PSC for console not selected"
100 mpc52xx_psc_putc(struct mpc52xx_psc __iomem *psc, unsigned char c)
102 while (!(in_be16(&psc->mpc52xx_psc_status) &
103 MPC52xx_PSC_SR_TXRDY));
104 out_8(&psc->mpc52xx_psc_buffer_8, c);
108 mpc52xx_progress(char *s, unsigned short hex)
111 struct mpc52xx_psc __iomem *psc;
113 psc = MPC52xx_VA(MPC52xx_PSCx_OFFSET(MPC52xx_PF_CONSOLE_PORT));
115 while ((c = *s++) != 0) {
117 mpc52xx_psc_putc(psc, '\r');
118 mpc52xx_psc_putc(psc, c);
121 mpc52xx_psc_putc(psc, '\r');
122 mpc52xx_psc_putc(psc, '\n');
125 #endif /* CONFIG_SERIAL_TEXT_DEBUG */
129 mpc52xx_find_end_of_memory(void)
131 u32 ramsize = __res.bi_memsize;
134 * if bootloader passed a memsize, just use it
135 * else get size from sdram config registers
138 struct mpc52xx_mmap_ctl __iomem *mmap_ctl;
139 u32 sdram_config_0, sdram_config_1;
141 /* Temp BAT2 mapping active when this is called ! */
142 mmap_ctl = MPC52xx_VA(MPC52xx_MMAP_CTL_OFFSET);
144 sdram_config_0 = in_be32(&mmap_ctl->sdram0);
145 sdram_config_1 = in_be32(&mmap_ctl->sdram1);
147 if ((sdram_config_0 & 0x1f) >= 0x13)
148 ramsize = 1 << ((sdram_config_0 & 0xf) + 17);
150 if (((sdram_config_1 & 0x1f) >= 0x13) &&
151 ((sdram_config_1 & 0xfff00000) == ramsize))
152 ramsize += 1 << ((sdram_config_1 & 0xf) + 17);
159 mpc52xx_calibrate_decr(void)
161 int current_time, previous_time;
162 int tbl_start, tbl_end;
163 unsigned int xlbfreq, cpufreq, ipbfreq, pcifreq, divisor;
165 xlbfreq = __res.bi_busfreq;
166 /* if bootloader didn't pass bus frequencies, calculate them */
168 /* Get RTC & Clock manager modules */
169 struct mpc52xx_rtc __iomem *rtc;
170 struct mpc52xx_cdm __iomem *cdm;
172 rtc = ioremap(MPC52xx_PA(MPC52xx_RTC_OFFSET), MPC52xx_RTC_SIZE);
173 cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
175 if ((rtc==NULL) || (cdm==NULL))
176 panic("Can't ioremap RTC/CDM while computing bus freq");
178 /* Count bus clock during 1/64 sec */
179 out_be32(&rtc->dividers, 0x8f1f0000); /* Set RTC 64x faster */
180 previous_time = in_be32(&rtc->time);
181 while ((current_time = in_be32(&rtc->time)) == previous_time) ;
182 tbl_start = get_tbl();
183 previous_time = current_time;
184 while ((current_time = in_be32(&rtc->time)) == previous_time) ;
186 out_be32(&rtc->dividers, 0xffff0000); /* Restore RTC */
188 /* Compute all frequency from that & CDM settings */
189 xlbfreq = (tbl_end - tbl_start) << 8;
190 cpufreq = (xlbfreq * core_mult[in_be32(&cdm->rstcfg)&0x1f])/10;
191 ipbfreq = (in_8(&cdm->ipb_clk_sel) & 1) ?
192 xlbfreq / 2 : xlbfreq;
193 switch (in_8(&cdm->pci_clk_sel) & 3) {
198 pcifreq = ipbfreq / 2;
201 pcifreq = xlbfreq / 4;
204 __res.bi_busfreq = xlbfreq;
205 __res.bi_intfreq = cpufreq;
206 __res.bi_ipbfreq = ipbfreq;
207 __res.bi_pcifreq = pcifreq;
209 /* Release mapping */
216 tb_ticks_per_jiffy = xlbfreq / HZ / divisor;
217 tb_to_us = mulhwu_scale_factor(xlbfreq / divisor, 1000000);
222 mpc52xx_setup_cpu(void)
224 struct mpc52xx_cdm __iomem *cdm;
225 struct mpc52xx_xlb __iomem *xlb;
228 cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
229 xlb = ioremap(MPC52xx_PA(MPC52xx_XLB_OFFSET), MPC52xx_XLB_SIZE);
232 printk(KERN_ERR __FILE__ ": "
233 "Error while mapping CDM/XLB during "
234 "mpc52xx_setup_cpu\n");
238 /* Use internal 48 Mhz */
239 out_8(&cdm->ext_48mhz_en, 0x00);
240 out_8(&cdm->fd_enable, 0x01);
241 if (in_be32(&cdm->rstcfg) & 0x40) /* Assumes 33Mhz clock */
242 out_be16(&cdm->fd_counters, 0x0001);
244 out_be16(&cdm->fd_counters, 0x5555);
246 /* Configure the XLB Arbiter priorities */
247 out_be32(&xlb->master_pri_enable, 0xff);
248 out_be32(&xlb->master_priority, 0x11111111);
250 /* Enable ram snooping for 1GB window */
251 out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_SNOOP);
252 out_be32(&xlb->snoop_window, MPC52xx_PCI_TARGET_MEM | 0x1d);
254 /* Disable XLB pipelining */
255 /* (cfr errate 292. We could do this only just before ATA PIO
256 transaction and re-enable it after ...) */
257 out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS);
261 if (cdm) iounmap(cdm);
262 if (xlb) iounmap(xlb);
266 int mpc52xx_match_psc_function(int psc_idx, const char *func)
268 struct mpc52xx_psc_func *cf = mpc52xx_psc_functions;
270 while ((cf->id != -1) && (cf->func != NULL)) {
271 if ((cf->id == psc_idx) && !strcmp(cf->func,func))