ColdFire: Add MCF5227x cpu and MCF52277EVB support-2

Signed-off-by: TsiChungLiew <Tsi-Chung.Liew@freescale.com>
Signed-off by: John Rigby <jrigby@freescale.com>

1 files changed, 120 insertions, 0 deletions

diff --git a/cpu/mcf5227x/speed.c b/cpu/mcf5227x/speed.c
new file mode 100644
index 0000000..78c946f
--- /dev/null
+++ b/cpu/mcf5227x/speed.c
@@ -0,0 +1,120 @@
+/*
+ *
+ * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ *
+ * 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 <asm/processor.h>
+
+#include <asm/immap.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Low Power Divider specifications
+ */
+#define CLOCK_LPD_MIN		(1 << 0)	/* Divider (decoded) */
+#define CLOCK_LPD_MAX		(1 << 15)	/* Divider (decoded) */
+
+#define CLOCK_PLL_FVCO_MAX	540000000
+#define CLOCK_PLL_FVCO_MIN	300000000
+
+#define CLOCK_PLL_FSYS_MAX	266666666
+#define CLOCK_PLL_FSYS_MIN	100000000
+#define MHZ			1000000
+
+void clock_enter_limp(int lpdiv)
+{
+	volatile ccm_t *ccm = (volatile ccm_t *)MMAP_CCM;
+	int i, j;
+
+	/* Check bounds of divider */
+	if (lpdiv < CLOCK_LPD_MIN)
+		lpdiv = CLOCK_LPD_MIN;
+	if (lpdiv > CLOCK_LPD_MAX)
+		lpdiv = CLOCK_LPD_MAX;
+
+	/* Round divider down to nearest power of two */
+	for (i = 0, j = lpdiv; j != 1; j >>= 1, i++) ;
+
+	/* Apply the divider to the system clock */
+	ccm->cdr = (ccm->cdr & 0xF0FF) | CCM_CDR_LPDIV(i);
+
+	/* Enable Limp Mode */
+	ccm->misccr |= CCM_MISCCR_LIMP;
+}
+
+/*
+ * brief   Exit Limp mode
+ * warning The PLL should be set and locked prior to exiting Limp mode
+ */
+void clock_exit_limp(void)
+{
+	volatile ccm_t *ccm = (volatile ccm_t *)MMAP_CCM;
+	volatile pll_t *pll = (volatile pll_t *)MMAP_PLL;
+
+	/* Exit Limp mode */
+	ccm->misccr &= ~CCM_MISCCR_LIMP;
+
+	/* Wait for the PLL to lock */
+	while (!(pll->psr & PLL_PSR_LOCK)) ;
+}
+
+/*
+ * get_clocks() fills in gd->cpu_clock and gd->bus_clk
+ */
+int get_clocks(void)
+{
+
+	volatile ccm_t *ccm = (volatile ccm_t *)MMAP_CCM;
+	volatile pll_t *pll = (volatile pll_t *)MMAP_PLL;
+	int vco, temp, pcrvalue, pfdr;
+	u8 bootmode;
+
+	bootmode = (ccm->ccr & 0x000C) >> 2;
+
+	pcrvalue = pll->pcr & 0xFF0F0FFF;
+	pfdr = pcrvalue >> 24;
+
+	if (pfdr != 0x1E) {
+		/* serial mode */
+	} else {
+		/* Normal Mode */
+		vco = pfdr * CFG_INPUT_CLKSRC;
+		gd->vco_clk = vco;
+	}
+
+	if ((ccm->ccr & CCM_MISCCR_LIMP) == CCM_MISCCR_LIMP) {
+		/* Limp mode */
+	} else {
+		gd->inp_clk = CFG_INPUT_CLKSRC;	/* Input clock */
+
+		temp = (pll->pcr & PLL_PCR_OUTDIV1_MASK) + 1;
+		gd->cpu_clk = vco / temp;	/* cpu clock */
+
+		temp = ((pll->pcr & PLL_PCR_OUTDIV2_MASK) >> 4) + 1;
+		gd->flb_clk = vco / temp;	/* flexbus clock */
+		gd->bus_clk = gd->flb_clk;
+	}
+
+	return (0);
+}