Move arch/ppc to arch/powerpc

As discussed on the list, move "arch/ppc" to "arch/powerpc" to
better match the Linux directory structure.

Please note that this patch also changes the "ppc" target in
MAKEALL to "powerpc" to match this new infrastructure. But "ppc"
is kept as an alias for now, to not break compatibility with
scripts using this name.

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
Acked-by: Detlev Zundel <dzu@denx.de>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Anatolij Gustschin <agust@denx.de>

1 files changed, 416 insertions, 0 deletions

diff --git a/arch/powerpc/cpu/mpc8xx/speed.c b/arch/powerpc/cpu/mpc8xx/speed.c
new file mode 100644
index 0000000000..f309f29c04
--- /dev/null
+++ b/arch/powerpc/cpu/mpc8xx/speed.c
@@ -0,0 +1,416 @@
+/*
+ * (C) Copyright 2000-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <mpc8xx.h>
+#include <asm/processor.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if !defined(CONFIG_8xx_CPUCLK_DEFAULT) || defined(CONFIG_SYS_MEASURE_CPUCLK) || defined(DEBUG)
+
+#define PITC_SHIFT 16
+#define PITR_SHIFT 16
+/* pitc values to time for 58/8192 seconds (about 70.8 milliseconds) */
+#define SPEED_PIT_COUNTS 58
+#define SPEED_PITC	 ((SPEED_PIT_COUNTS - 1) << PITC_SHIFT)
+#define SPEED_PITC_INIT	 ((SPEED_PIT_COUNTS + 1) << PITC_SHIFT)
+
+/* Access functions for the Machine State Register */
+static __inline__ unsigned long get_msr(void)
+{
+	unsigned long msr;
+
+	asm volatile("mfmsr %0" : "=r" (msr) :);
+	return msr;
+}
+
+static __inline__ void set_msr(unsigned long msr)
+{
+	asm volatile("mtmsr %0" : : "r" (msr));
+}
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Measure CPU clock speed (core clock GCLK1, GCLK2),
+ * also determine bus clock speed (checking bus divider factor)
+ *
+ * (Approx. GCLK frequency in Hz)
+ *
+ * Initializes timer 2 and PIT, but disables them before return.
+ * [Use timer 2, because MPC823 CPUs mask 0.x do not have timers 3 and 4]
+ *
+ * When measuring the CPU clock against the PIT, we count cpu clocks
+ * for 58/8192 seconds with a prescale divide by 177 for the cpu clock.
+ * These strange values for the timing interval and prescaling are used
+ * because the formula for the CPU clock is:
+ *
+ *    CPU clock = count * (177 * (8192 / 58))
+ *
+ *		= count * 24999.7241
+ *
+ *    which is very close to
+ *
+ *		= count * 25000
+ *
+ * Since the count gives the CPU clock divided by 25000, we can get
+ * the CPU clock rounded to the nearest 0.1 MHz by
+ *
+ *    CPU clock = ((count + 2) / 4) * 100000;
+ *
+ * The rounding is important since the measurement is sometimes going
+ * to be high or low by 0.025 MHz, depending on exactly how the clocks
+ * and counters interact. By rounding we get the exact answer for any
+ * CPU clock that is an even multiple of 0.1 MHz.
+ */
+
+unsigned long measure_gclk(void)
+{
+	volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+	volatile cpmtimer8xx_t *timerp = &immr->im_cpmtimer;
+	ulong timer2_val;
+	ulong msr_val;
+
+#ifdef CONFIG_SYS_8XX_XIN
+	/* dont use OSCM, only use EXTCLK/512 */
+	immr->im_clkrst.car_sccr |= SCCR_RTSEL | SCCR_RTDIV;
+#else
+	immr->im_clkrst.car_sccr &= ~(SCCR_RTSEL | SCCR_RTDIV);
+#endif
+
+	/* Reset + Stop Timer 2, no cascading
+	 */
+	timerp->cpmt_tgcr &= ~(TGCR_CAS2 | TGCR_RST2);
+
+	/* Keep stopped, halt in debug mode
+	 */
+	timerp->cpmt_tgcr |= (TGCR_FRZ2 | TGCR_STP2);
+
+	/* Timer 2 setup:
+	 * Output ref. interrupt disable, int. clock
+	 * Prescale by 177. Note that prescaler divides by value + 1
+	 * so we must subtract 1 here.
+	 */
+	timerp->cpmt_tmr2 = ((177 - 1) << TMR_PS_SHIFT) | TMR_ICLK_IN_GEN;
+
+	timerp->cpmt_tcn2 = 0;		/* reset state		*/
+	timerp->cpmt_tgcr |= TGCR_RST2;	/* enable timer 2	*/
+
+	/*
+	 * PIT setup:
+	 *
+	 * We want to time for SPEED_PITC_COUNTS counts (of 8192 Hz),
+	 * so the count value would be SPEED_PITC_COUNTS - 1.
+	 * But there would be an uncertainty in the start time of 1/4
+	 * count since when we enable the PIT the count is not
+	 * synchronized to the 32768 Hz oscillator. The trick here is
+	 * to start the count higher and wait until the PIT count
+	 * changes to the required value before starting timer 2.
+	 *
+	 * One count high should be enough, but occasionally the start
+	 * is off by 1 or 2 counts of 32768 Hz. With the start value
+	 * set two counts high it seems very reliable.
+	 */
+
+	immr->im_sitk.sitk_pitck = KAPWR_KEY;	/* PIT initialization */
+	immr->im_sit.sit_pitc = SPEED_PITC_INIT;
+
+	immr->im_sitk.sitk_piscrk = KAPWR_KEY;
+	immr->im_sit.sit_piscr = CONFIG_SYS_PISCR;
+
+	/*
+	 * Start measurement - disable interrupts, just in case
+	 */
+	msr_val = get_msr ();
+	set_msr (msr_val & ~MSR_EE);
+
+	immr->im_sit.sit_piscr |= PISCR_PTE;
+
+	/* spin until get exact count when we want to start */
+	while (immr->im_sit.sit_pitr > SPEED_PITC);
+
+	timerp->cpmt_tgcr &= ~TGCR_STP2;	/* Start Timer 2	*/
+	while ((immr->im_sit.sit_piscr & PISCR_PS) == 0);
+	timerp->cpmt_tgcr |= TGCR_STP2;		/* Stop  Timer 2	*/
+
+	/* re-enable external interrupts if they were on */
+	set_msr (msr_val);
+
+	/* Disable timer and PIT
+	 */
+	timer2_val = timerp->cpmt_tcn2;		/* save before reset timer */
+
+	timerp->cpmt_tgcr &= ~(TGCR_RST2 | TGCR_FRZ2 | TGCR_STP2);
+	immr->im_sit.sit_piscr &= ~PISCR_PTE;
+
+#if defined(CONFIG_SYS_8XX_XIN)
+	/* not using OSCM, using XIN, so scale appropriately */
+	return (((timer2_val + 2) / 4) * (CONFIG_SYS_8XX_XIN/512))/8192 * 100000L;
+#else
+	return ((timer2_val + 2) / 4) * 100000L;	/* convert to Hz	*/
+#endif
+}
+
+#endif
+
+void get_brgclk(uint sccr)
+{
+	uint divider = 0;
+
+	switch((sccr&SCCR_DFBRG11)>>11){
+		case 0:
+			divider = 1;
+			break;
+		case 1:
+			divider = 4;
+			break;
+		case 2:
+			divider = 16;
+			break;
+		case 3:
+			divider = 64;
+			break;
+	}
+	gd->brg_clk = gd->cpu_clk/divider;
+}
+
+#if !defined(CONFIG_8xx_CPUCLK_DEFAULT)
+
+/*
+ * get_clocks() fills in gd->cpu_clock depending on CONFIG_8xx_GCLK_FREQ
+ * or (if it is not defined) measure_gclk() (which uses the ref clock)
+ * from above.
+ */
+int get_clocks (void)
+{
+	uint immr = get_immr (0);	/* Return full IMMR contents */
+	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
+	uint sccr = immap->im_clkrst.car_sccr;
+	/*
+	 * If for some reason measuring the gclk frequency won't
+	 * work, we return the hardwired value.
+	 * (For example, the cogent CMA286-60 CPU module has no
+	 * separate oscillator for PITRTCLK)
+	 */
+#if defined(CONFIG_8xx_GCLK_FREQ)
+	gd->cpu_clk = CONFIG_8xx_GCLK_FREQ;
+#elif defined(CONFIG_8xx_OSCLK)
+#define PLPRCR_val(a) ((pll & PLPRCR_ ## a ## _MSK) >> PLPRCR_ ## a ## _SHIFT)
+	uint pll = immap->im_clkrst.car_plprcr;
+	uint clk;
+
+	if ((immr & 0x0FFF) >= MPC8xx_NEW_CLK) { /* MPC866/87x/88x series */
+		clk = ((CONFIG_8xx_OSCLK / (PLPRCR_val(PDF)+1)) *
+		       (PLPRCR_val(MFI) + PLPRCR_val(MFN) / (PLPRCR_val(MFD)+1))) /
+			(1<<PLPRCR_val(S));
+	} else {
+		clk = CONFIG_8xx_OSCLK * (PLPRCR_val(MF)+1);
+	}
+	if (pll & PLPRCR_CSRC) {	/* Low frequency division factor is used  */
+		gd->cpu_clk = clk / (2 << ((sccr >> 8) & 7));
+	} else {			/* High frequency division factor is used */
+		gd->cpu_clk = clk / (1 << ((sccr >> 5) & 7));
+	}
+#else
+	gd->cpu_clk = measure_gclk();
+#endif /* CONFIG_8xx_GCLK_FREQ */
+
+	if ((sccr & SCCR_EBDF11) == 0) {
+		/* No Bus Divider active */
+		gd->bus_clk = gd->cpu_clk;
+	} else {
+		/* The MPC8xx has only one BDF: half clock speed */
+		gd->bus_clk = gd->cpu_clk / 2;
+	}
+
+	get_brgclk(sccr);
+
+	return (0);
+}
+
+#else /* CONFIG_8xx_CPUCLK_DEFAULT defined, use dynamic clock setting */
+
+static long init_pll_866 (long clk);
+
+/* This function sets up PLL (init_pll_866() is called) and
+ * fills gd->cpu_clk and gd->bus_clk according to the environment
+ * variable 'cpuclk' or to CONFIG_8xx_CPUCLK_DEFAULT (if 'cpuclk'
+ * contains invalid value).
+ * This functions requires an MPC866 or newer series CPU.
+ */
+int get_clocks_866 (void)
+{
+	volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+	char		  tmp[64];
+	long		  cpuclk = 0;
+	long		  sccr_reg;
+
+	if (getenv_r ("cpuclk", tmp, sizeof (tmp)) > 0)
+		cpuclk = simple_strtoul (tmp, NULL, 10) * 1000000;
+
+	if ((CONFIG_SYS_8xx_CPUCLK_MIN > cpuclk) || (CONFIG_SYS_8xx_CPUCLK_MAX < cpuclk))
+		cpuclk = CONFIG_8xx_CPUCLK_DEFAULT;
+
+	gd->cpu_clk = init_pll_866 (cpuclk);
+#if defined(CONFIG_SYS_MEASURE_CPUCLK)
+	gd->cpu_clk = measure_gclk ();
+#endif
+
+	get_brgclk(immr->im_clkrst.car_sccr);
+
+	/* if cpu clock <= 66 MHz then set bus division factor to 1,
+	 * otherwise set it to 2
+	 */
+	sccr_reg = immr->im_clkrst.car_sccr;
+	sccr_reg &= ~SCCR_EBDF11;
+
+	if (gd->cpu_clk <= 66000000) {
+		sccr_reg |= SCCR_EBDF00;	/* bus division factor = 1 */
+		gd->bus_clk = gd->cpu_clk;
+	} else {
+		sccr_reg |= SCCR_EBDF01;	/* bus division factor = 2 */
+		gd->bus_clk = gd->cpu_clk / 2;
+	}
+	immr->im_clkrst.car_sccr = sccr_reg;
+
+	return (0);
+}
+
+/* Adjust sdram refresh rate to actual CPU clock.
+ */
+int sdram_adjust_866 (void)
+{
+	volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+	long		  mamr;
+
+	mamr = immr->im_memctl.memc_mamr;
+	mamr &= ~MAMR_PTA_MSK;
+	mamr |= ((gd->cpu_clk / CONFIG_SYS_PTA_PER_CLK) << MAMR_PTA_SHIFT);
+	immr->im_memctl.memc_mamr = mamr;
+
+	return (0);
+}
+
+/* Configure PLL for MPC866/859/885 CPU series
+ * PLL multiplication factor is set to the value nearest to the desired clk,
+ * assuming a oscclk of 10 MHz.
+ */
+static long init_pll_866 (long clk)
+{
+	extern void plprcr_write_866 (long);
+
+	volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+	long		  n, plprcr;
+	char		  mfi, mfn, mfd, s, pdf;
+	long		  step_mfi, step_mfn;
+
+	if (clk < 20000000) {
+		clk *= 2;
+		pdf = 1;
+	} else {
+		pdf = 0;
+	}
+
+	if (clk < 40000000) {
+		s = 2;
+		step_mfi = CONFIG_8xx_OSCLK / 4;
+		mfd = 7;
+		step_mfn = CONFIG_8xx_OSCLK / 30;
+	} else if (clk < 80000000) {
+		s = 1;
+		step_mfi = CONFIG_8xx_OSCLK / 2;
+		mfd = 14;
+		step_mfn = CONFIG_8xx_OSCLK / 30;
+	} else {
+		s = 0;
+		step_mfi = CONFIG_8xx_OSCLK;
+		mfd = 29;
+		step_mfn = CONFIG_8xx_OSCLK / 30;
+	}
+
+	/* Calculate integer part of multiplication factor
+	 */
+	n = clk / step_mfi;
+	mfi = (char)n;
+
+	/* Calculate numerator of fractional part of multiplication factor
+	 */
+	n = clk - (n * step_mfi);
+	mfn = (char)(n / step_mfn);
+
+	/* Calculate effective clk
+	 */
+	n = ((mfi * step_mfi) + (mfn * step_mfn)) / (pdf + 1);
+
+	immr->im_clkrstk.cark_plprcrk = KAPWR_KEY;
+
+	plprcr = (immr->im_clkrst.car_plprcr & ~(PLPRCR_MFN_MSK
+			| PLPRCR_MFD_MSK | PLPRCR_S_MSK
+			| PLPRCR_MFI_MSK | PLPRCR_DBRMO
+			| PLPRCR_PDF_MSK))
+			| (mfn << PLPRCR_MFN_SHIFT)
+			| (mfd << PLPRCR_MFD_SHIFT)
+			| (s << PLPRCR_S_SHIFT)
+			| (mfi << PLPRCR_MFI_SHIFT)
+			| (pdf << PLPRCR_PDF_SHIFT);
+
+	if( (mfn > 0) && ((mfd / mfn) > 10) )
+		plprcr |= PLPRCR_DBRMO;
+
+	plprcr_write_866 (plprcr);		/* set value using SIU4/9 workaround */
+	immr->im_clkrstk.cark_plprcrk = 0x00000000;
+
+	return (n);
+}
+
+#endif /* CONFIG_8xx_CPUCLK_DEFAULT */
+
+#if defined(CONFIG_TQM8xxL) && !defined(CONFIG_TQM866M) \
+    && !defined(CONFIG_TQM885D)
+/*
+ * Adjust sdram refresh rate to actual CPU clock
+ * and set timebase source according to actual CPU clock
+ */
+int adjust_sdram_tbs_8xx (void)
+{
+	volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
+	long		  mamr;
+	long              sccr;
+
+	mamr = immr->im_memctl.memc_mamr;
+	mamr &= ~MAMR_PTA_MSK;
+	mamr |= ((gd->cpu_clk / CONFIG_SYS_PTA_PER_CLK) << MAMR_PTA_SHIFT);
+	immr->im_memctl.memc_mamr = mamr;
+
+	if (gd->cpu_clk < 67000000) {
+		sccr = immr->im_clkrst.car_sccr;
+		sccr |= SCCR_TBS;
+		immr->im_clkrst.car_sccr = sccr;
+	}
+
+	return (0);
+}
+#endif /* CONFIG_TQM8xxL/M, !TQM866M, !TQM885D */
+
+/* ------------------------------------------------------------------------- */