2 * arch/ppc/syslib/mpc52xx_setup.c
4 * Common code for the boards based on Freescale MPC52xx embedded CPU.
7 * Maintainer : Sylvain Munaut <tnt@246tNt.com>
9 * Support for other bootloaders than UBoot by Dale Farnsworth
10 * <dfarnsworth@mvista.com>
12 * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
13 * Copyright (C) 2003 Montavista Software, Inc
15 * This file is licensed under the terms of the GNU General Public License
16 * version 2. This program is licensed "as is" without any warranty of any
17 * kind, whether express or implied.
20 #include <linux/config.h>
24 #include <asm/mpc52xx.h>
25 #include <asm/mpc52xx_psc.h>
26 #include <asm/pgtable.h>
27 #include <asm/ppcboot.h>
31 static int core_mult[] = { /* CPU Frequency multiplier, taken */
32 0, 0, 0, 10, 20, 20, 25, 45, /* from the datasheet used to compute */
33 30, 55, 40, 50, 0, 60, 35, 0, /* CPU frequency from XLB freq and */
34 30, 25, 65, 10, 70, 20, 75, 45, /* external jumper config */
35 0, 55, 40, 50, 80, 60, 35, 0
39 mpc52xx_restart(char *cmd)
41 struct mpc52xx_gpt __iomem *gpt0 = MPC52xx_VA(MPC52xx_GPTx_OFFSET(0));
45 /* Turn on the watchdog and wait for it to expire. It effectively
47 out_be32(&gpt0->count, 0x000000ff);
48 out_be32(&gpt0->mode, 0x00009004);
62 mpc52xx_power_off(void)
64 /* By default we don't have any way of shut down.
65 If a specific board wants to, it can set the power down
66 code to any hardware implementation dependent code */
74 /* Set BAT 2 to map the 0xf0000000 area */
75 /* This mapping is used during mpc52xx_progress,
76 * mpc52xx_find_end_of_memory, and UARTs/GPIO access for debug
79 mtspr(SPRN_DBAT2U, 0xf0001ffe);
80 mtspr(SPRN_DBAT2L, 0xf000002a);
87 /* Here we map the MBAR and the whole upper zone. MBAR is only
88 64k but we can't map only 64k with BATs. Map the whole
89 0xf0000000 range is ok and helps eventual lpb devices placed there */
91 MPC52xx_MBAR_VIRT, MPC52xx_MBAR, 0x10000000, _PAGE_IO);
95 #ifdef CONFIG_SERIAL_TEXT_DEBUG
96 #ifndef MPC52xx_PF_CONSOLE_PORT
97 #error "mpc52xx PSC for console not selected"
101 mpc52xx_psc_putc(struct mpc52xx_psc __iomem *psc, unsigned char c)
103 while (!(in_be16(&psc->mpc52xx_psc_status) &
104 MPC52xx_PSC_SR_TXRDY));
105 out_8(&psc->mpc52xx_psc_buffer_8, c);
109 mpc52xx_progress(char *s, unsigned short hex)
112 struct mpc52xx_psc __iomem *psc;
114 psc = MPC52xx_VA(MPC52xx_PSCx_OFFSET(MPC52xx_PF_CONSOLE_PORT));
116 while ((c = *s++) != 0) {
118 mpc52xx_psc_putc(psc, '\r');
119 mpc52xx_psc_putc(psc, c);
122 mpc52xx_psc_putc(psc, '\r');
123 mpc52xx_psc_putc(psc, '\n');
126 #endif /* CONFIG_SERIAL_TEXT_DEBUG */
130 mpc52xx_find_end_of_memory(void)
132 u32 ramsize = __res.bi_memsize;
135 * if bootloader passed a memsize, just use it
136 * else get size from sdram config registers
139 struct mpc52xx_mmap_ctl __iomem *mmap_ctl;
140 u32 sdram_config_0, sdram_config_1;
142 /* Temp BAT2 mapping active when this is called ! */
143 mmap_ctl = MPC52xx_VA(MPC52xx_MMAP_CTL_OFFSET);
145 sdram_config_0 = in_be32(&mmap_ctl->sdram0);
146 sdram_config_1 = in_be32(&mmap_ctl->sdram1);
148 if ((sdram_config_0 & 0x1f) >= 0x13)
149 ramsize = 1 << ((sdram_config_0 & 0xf) + 17);
151 if (((sdram_config_1 & 0x1f) >= 0x13) &&
152 ((sdram_config_1 & 0xfff00000) == ramsize))
153 ramsize += 1 << ((sdram_config_1 & 0xf) + 17);
160 mpc52xx_calibrate_decr(void)
162 int current_time, previous_time;
163 int tbl_start, tbl_end;
164 unsigned int xlbfreq, cpufreq, ipbfreq, pcifreq, divisor;
166 xlbfreq = __res.bi_busfreq;
167 /* if bootloader didn't pass bus frequencies, calculate them */
169 /* Get RTC & Clock manager modules */
170 struct mpc52xx_rtc __iomem *rtc;
171 struct mpc52xx_cdm __iomem *cdm;
173 rtc = ioremap(MPC52xx_PA(MPC52xx_RTC_OFFSET), MPC52xx_RTC_SIZE);
174 cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
176 if ((rtc==NULL) || (cdm==NULL))
177 panic("Can't ioremap RTC/CDM while computing bus freq");
179 /* Count bus clock during 1/64 sec */
180 out_be32(&rtc->dividers, 0x8f1f0000); /* Set RTC 64x faster */
181 previous_time = in_be32(&rtc->time);
182 while ((current_time = in_be32(&rtc->time)) == previous_time) ;
183 tbl_start = get_tbl();
184 previous_time = current_time;
185 while ((current_time = in_be32(&rtc->time)) == previous_time) ;
187 out_be32(&rtc->dividers, 0xffff0000); /* Restore RTC */
189 /* Compute all frequency from that & CDM settings */
190 xlbfreq = (tbl_end - tbl_start) << 8;
191 cpufreq = (xlbfreq * core_mult[in_be32(&cdm->rstcfg)&0x1f])/10;
192 ipbfreq = (in_8(&cdm->ipb_clk_sel) & 1) ?
193 xlbfreq / 2 : xlbfreq;
194 switch (in_8(&cdm->pci_clk_sel) & 3) {
199 pcifreq = ipbfreq / 2;
202 pcifreq = xlbfreq / 4;
205 __res.bi_busfreq = xlbfreq;
206 __res.bi_intfreq = cpufreq;
207 __res.bi_ipbfreq = ipbfreq;
208 __res.bi_pcifreq = pcifreq;
210 /* Release mapping */
217 tb_ticks_per_jiffy = xlbfreq / HZ / divisor;
218 tb_to_us = mulhwu_scale_factor(xlbfreq / divisor, 1000000);
221 int mpc52xx_match_psc_function(int psc_idx, const char *func)
223 struct mpc52xx_psc_func *cf = mpc52xx_psc_functions;
225 while ((cf->id != -1) && (cf->func != NULL)) {
226 if ((cf->id == psc_idx) && !strcmp(cf->func,func))