Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

arch/ppc/syslib/mpc52xx_setup.c

@@ -0,0 +1,230 @@
+/*
+ * arch/ppc/syslib/mpc52xx_setup.c
+ *
+ * Common code for the boards based on Freescale MPC52xx embedded CPU.
+ *
+ * 
+ * Maintainer : Sylvain Munaut <tnt@246tNt.com>
+ *
+ * Support for other bootloaders than UBoot by Dale Farnsworth 
+ * <dfarnsworth@mvista.com>
+ * 
+ * Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
+ * Copyright (C) 2003 Montavista Software, Inc
+ * 
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/config.h>
+
+#include <asm/io.h>
+#include <asm/time.h>
+#include <asm/mpc52xx.h>
+#include <asm/mpc52xx_psc.h>
+#include <asm/pgtable.h>
+#include <asm/ppcboot.h>
+
+extern bd_t __res;
+
+static int core_mult[] = {		/* CPU Frequency multiplier, taken    */
+	0,  0,  0,  10, 20, 20, 25, 45,	/* from the datasheet used to compute */
+	30, 55, 40, 50, 0,  60, 35, 0,	/* CPU frequency from XLB freq and    */
+	30, 25, 65, 10, 70, 20, 75, 45,	/* external jumper config             */
+	0,  55, 40, 50, 80, 60, 35, 0
+};
+
+void
+mpc52xx_restart(char *cmd)
+{
+	struct mpc52xx_gpt __iomem *gpt0 = MPC52xx_VA(MPC52xx_GPTx_OFFSET(0));
+
+	local_irq_disable();
+
+	/* Turn on the watchdog and wait for it to expire. It effectively
+	  does a reset */
+	out_be32(&gpt0->count, 0x000000ff);
+	out_be32(&gpt0->mode, 0x00009004);
+
+	while (1);
+}
+
+void
+mpc52xx_halt(void)
+{
+	local_irq_disable();
+
+	while (1);
+}
+
+void
+mpc52xx_power_off(void)
+{
+	/* By default we don't have any way of shut down.
+	   If a specific board wants to, it can set the power down
+	   code to any hardware implementation dependent code */
+	mpc52xx_halt();
+}
+
+
+void __init
+mpc52xx_set_bat(void)
+{
+	/* Set BAT 2 to map the 0xf0000000 area */
+	/* This mapping is used during mpc52xx_progress,
+	 * mpc52xx_find_end_of_memory, and UARTs/GPIO access for debug
+	 */
+	mb();
+	mtspr(SPRN_DBAT2U, 0xf0001ffe);
+	mtspr(SPRN_DBAT2L, 0xf000002a);
+	mb();
+}
+
+void __init
+mpc52xx_map_io(void)
+{
+	/* Here we only map the MBAR */
+	io_block_mapping(
+		MPC52xx_MBAR_VIRT, MPC52xx_MBAR, MPC52xx_MBAR_SIZE, _PAGE_IO);
+}
+
+
+#ifdef CONFIG_SERIAL_TEXT_DEBUG
+#ifndef MPC52xx_PF_CONSOLE_PORT
+#error "mpc52xx PSC for console not selected"
+#endif
+
+static void
+mpc52xx_psc_putc(struct mpc52xx_psc __iomem *psc, unsigned char c)
+{
+	while (!(in_be16(&psc->mpc52xx_psc_status) &
+	         MPC52xx_PSC_SR_TXRDY));
+	out_8(&psc->mpc52xx_psc_buffer_8, c);
+}
+
+void
+mpc52xx_progress(char *s, unsigned short hex)
+{
+	char c;
+	struct mpc52xx_psc __iomem *psc;
+
+	psc = MPC52xx_VA(MPC52xx_PSCx_OFFSET(MPC52xx_PF_CONSOLE_PORT));
+
+	while ((c = *s++) != 0) {
+		if (c == '\n')
+			mpc52xx_psc_putc(psc, '\r');
+		mpc52xx_psc_putc(psc, c);
+	}
+
+	mpc52xx_psc_putc(psc, '\r');
+	mpc52xx_psc_putc(psc, '\n');
+}
+
+#endif  /* CONFIG_SERIAL_TEXT_DEBUG */
+
+
+unsigned long __init
+mpc52xx_find_end_of_memory(void)
+{
+	u32 ramsize = __res.bi_memsize;
+
+	/*
+	 * if bootloader passed a memsize, just use it
+	 * else get size from sdram config registers
+	 */
+	if (ramsize == 0) {
+		struct mpc52xx_mmap_ctl __iomem *mmap_ctl;
+		u32 sdram_config_0, sdram_config_1;
+
+		/* Temp BAT2 mapping active when this is called ! */
+		mmap_ctl = MPC52xx_VA(MPC52xx_MMAP_CTL_OFFSET);
+
+		sdram_config_0 = in_be32(&mmap_ctl->sdram0);
+		sdram_config_1 = in_be32(&mmap_ctl->sdram1);
+
+		if ((sdram_config_0 & 0x1f) >= 0x13)
+			ramsize = 1 << ((sdram_config_0 & 0xf) + 17);
+
+		if (((sdram_config_1 & 0x1f) >= 0x13) &&
+				((sdram_config_1 & 0xfff00000) == ramsize))
+			ramsize += 1 << ((sdram_config_1 & 0xf) + 17);
+	}
+
+	return ramsize;
+}
+
+void __init
+mpc52xx_calibrate_decr(void)
+{
+	int current_time, previous_time;
+	int tbl_start, tbl_end;
+	unsigned int xlbfreq, cpufreq, ipbfreq, pcifreq, divisor;
+
+	xlbfreq = __res.bi_busfreq;
+	/* if bootloader didn't pass bus frequencies, calculate them */
+	if (xlbfreq == 0) {
+		/* Get RTC & Clock manager modules */
+		struct mpc52xx_rtc __iomem *rtc;
+		struct mpc52xx_cdm __iomem *cdm;
+
+		rtc = ioremap(MPC52xx_PA(MPC52xx_RTC_OFFSET), MPC52xx_RTC_SIZE);
+		cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
+
+		if ((rtc==NULL) || (cdm==NULL))
+			panic("Can't ioremap RTC/CDM while computing bus freq");
+
+		/* Count bus clock during 1/64 sec */
+		out_be32(&rtc->dividers, 0x8f1f0000);	/* Set RTC 64x faster */
+		previous_time = in_be32(&rtc->time);
+		while ((current_time = in_be32(&rtc->time)) == previous_time) ;
+		tbl_start = get_tbl();
+		previous_time = current_time;
+		while ((current_time = in_be32(&rtc->time)) == previous_time) ;
+		tbl_end = get_tbl();
+		out_be32(&rtc->dividers, 0xffff0000);	/* Restore RTC */
+
+		/* Compute all frequency from that & CDM settings */
+		xlbfreq = (tbl_end - tbl_start) << 8;
+		cpufreq = (xlbfreq * core_mult[in_be32(&cdm->rstcfg)&0x1f])/10;
+		ipbfreq = (in_8(&cdm->ipb_clk_sel) & 1) ?
+					xlbfreq / 2 : xlbfreq;
+		switch (in_8(&cdm->pci_clk_sel) & 3) {
+		case 0:
+			pcifreq = ipbfreq;
+			break;
+		case 1:
+			pcifreq = ipbfreq / 2;
+			break;
+		default:
+			pcifreq = xlbfreq / 4;
+			break;
+		}
+		__res.bi_busfreq = xlbfreq;
+		__res.bi_intfreq = cpufreq;
+		__res.bi_ipbfreq = ipbfreq;
+		__res.bi_pcifreq = pcifreq;
+
+		/* Release mapping */
+		iounmap(rtc);
+		iounmap(cdm);
+	}
+
+	divisor = 4;
+
+	tb_ticks_per_jiffy = xlbfreq / HZ / divisor;
+	tb_to_us = mulhwu_scale_factor(xlbfreq / divisor, 1000000);
+}
+
+int mpc52xx_match_psc_function(int psc_idx, const char *func)
+{
+	struct mpc52xx_psc_func *cf = mpc52xx_psc_functions;
+
+	while ((cf->id != -1) && (cf->func != NULL)) {
+		if ((cf->id == psc_idx) && !strcmp(cf->func,func))
+			return 1;
+		cf++;
+	}
+
+	return 0;
+}