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 only map the MBAR */
89 MPC52xx_MBAR_VIRT, MPC52xx_MBAR, MPC52xx_MBAR_SIZE, _PAGE_IO);
93 #ifdef CONFIG_SERIAL_TEXT_DEBUG
94 #ifndef MPC52xx_PF_CONSOLE_PORT
95 #error "mpc52xx PSC for console not selected"
99 mpc52xx_psc_putc(struct mpc52xx_psc __iomem *psc, unsigned char c)
101 while (!(in_be16(&psc->mpc52xx_psc_status) &
102 MPC52xx_PSC_SR_TXRDY));
103 out_8(&psc->mpc52xx_psc_buffer_8, c);
107 mpc52xx_progress(char *s, unsigned short hex)
110 struct mpc52xx_psc __iomem *psc;
112 psc = MPC52xx_VA(MPC52xx_PSCx_OFFSET(MPC52xx_PF_CONSOLE_PORT));
114 while ((c = *s++) != 0) {
116 mpc52xx_psc_putc(psc, '\r');
117 mpc52xx_psc_putc(psc, c);
120 mpc52xx_psc_putc(psc, '\r');
121 mpc52xx_psc_putc(psc, '\n');
124 #endif /* CONFIG_SERIAL_TEXT_DEBUG */
128 mpc52xx_find_end_of_memory(void)
130 u32 ramsize = __res.bi_memsize;
133 * if bootloader passed a memsize, just use it
134 * else get size from sdram config registers
137 struct mpc52xx_mmap_ctl __iomem *mmap_ctl;
138 u32 sdram_config_0, sdram_config_1;
140 /* Temp BAT2 mapping active when this is called ! */
141 mmap_ctl = MPC52xx_VA(MPC52xx_MMAP_CTL_OFFSET);
143 sdram_config_0 = in_be32(&mmap_ctl->sdram0);
144 sdram_config_1 = in_be32(&mmap_ctl->sdram1);
146 if ((sdram_config_0 & 0x1f) >= 0x13)
147 ramsize = 1 << ((sdram_config_0 & 0xf) + 17);
149 if (((sdram_config_1 & 0x1f) >= 0x13) &&
150 ((sdram_config_1 & 0xfff00000) == ramsize))
151 ramsize += 1 << ((sdram_config_1 & 0xf) + 17);
158 mpc52xx_calibrate_decr(void)
160 int current_time, previous_time;
161 int tbl_start, tbl_end;
162 unsigned int xlbfreq, cpufreq, ipbfreq, pcifreq, divisor;
164 xlbfreq = __res.bi_busfreq;
165 /* if bootloader didn't pass bus frequencies, calculate them */
167 /* Get RTC & Clock manager modules */
168 struct mpc52xx_rtc __iomem *rtc;
169 struct mpc52xx_cdm __iomem *cdm;
171 rtc = ioremap(MPC52xx_PA(MPC52xx_RTC_OFFSET), MPC52xx_RTC_SIZE);
172 cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
174 if ((rtc==NULL) || (cdm==NULL))
175 panic("Can't ioremap RTC/CDM while computing bus freq");
177 /* Count bus clock during 1/64 sec */
178 out_be32(&rtc->dividers, 0x8f1f0000); /* Set RTC 64x faster */
179 previous_time = in_be32(&rtc->time);
180 while ((current_time = in_be32(&rtc->time)) == previous_time) ;
181 tbl_start = get_tbl();
182 previous_time = current_time;
183 while ((current_time = in_be32(&rtc->time)) == previous_time) ;
185 out_be32(&rtc->dividers, 0xffff0000); /* Restore RTC */
187 /* Compute all frequency from that & CDM settings */
188 xlbfreq = (tbl_end - tbl_start) << 8;
189 cpufreq = (xlbfreq * core_mult[in_be32(&cdm->rstcfg)&0x1f])/10;
190 ipbfreq = (in_8(&cdm->ipb_clk_sel) & 1) ?
191 xlbfreq / 2 : xlbfreq;
192 switch (in_8(&cdm->pci_clk_sel) & 3) {
197 pcifreq = ipbfreq / 2;
200 pcifreq = xlbfreq / 4;
203 __res.bi_busfreq = xlbfreq;
204 __res.bi_intfreq = cpufreq;
205 __res.bi_ipbfreq = ipbfreq;
206 __res.bi_pcifreq = pcifreq;
208 /* Release mapping */
215 tb_ticks_per_jiffy = xlbfreq / HZ / divisor;
216 tb_to_us = mulhwu_scale_factor(xlbfreq / divisor, 1000000);
219 int mpc52xx_match_psc_function(int psc_idx, const char *func)
221 struct mpc52xx_psc_func *cf = mpc52xx_psc_functions;
223 while ((cf->id != -1) && (cf->func != NULL)) {
224 if ((cf->id == psc_idx) && !strcmp(cf->func,func))