* Code cleanup
* Patch by Sascha Hauer, 28 Jun:
- add generic support for Motorola i.MX architecture
- add support for mx1ads, mx1fs2 and scb9328 boards
* Patches by Marc Leeman, 23 Jul 2004:
- Add define for the PCI/Memory Buffer Configuration Register
- corrected comments in cpu/mpc824x/cpu_init.c
* Add support for multiple serial interfaces
(for example to allow modem dial-in / dial-out)
diff --git a/cpu/arm920t/imx_speed.c b/cpu/arm920t/imx_speed.c
new file mode 100644
index 0000000..1e29698
--- /dev/null
+++ b/cpu/arm920t/imx_speed.c
@@ -0,0 +1,102 @@
+/*
+ *
+ * (c) 2004 Sascha Hauer <sascha@saschahauer.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>
+#if defined (CONFIG_IMX)
+
+#include <asm/arch/imx-regs.h>
+
+/* ------------------------------------------------------------------------- */
+/* NOTE: This describes the proper use of this file.
+ *
+ * CONFIG_SYS_CLK_FREQ should be defined as the input frequency of the PLL.
+ * SH FIXME: 16780000 in our case
+ * get_FCLK(), get_HCLK(), get_PCLK() and get_UCLK() return the clock of
+ * the specified bus in HZ.
+ */
+/* ------------------------------------------------------------------------- */
+
+ulong get_systemPLLCLK(void)
+{
+ /* FIXME: We assume System_SEL = 0 here */
+ u32 spctl0 = SPCTL0;
+ u32 mfi = (spctl0 >> 10) & 0xf;
+ u32 mfn = spctl0 & 0x3f;
+ u32 mfd = (spctl0 >> 16) & 0x3f;
+ u32 pd = (spctl0 >> 26) & 0xf;
+
+ mfi = mfi<=5 ? 5 : mfi;
+
+ return (2*(CONFIG_SYSPLL_CLK_FREQ>>10)*( (mfi<<10) + (mfn<<10)/(mfd+1)))/(pd+1);
+}
+
+ulong get_mcuPLLCLK(void)
+{
+ /* FIXME: We assume System_SEL = 0 here */
+ u32 mpctl0 = MPCTL0;
+ u32 mfi = (mpctl0 >> 10) & 0xf;
+ u32 mfn = mpctl0 & 0x3f;
+ u32 mfd = (mpctl0 >> 16) & 0x3f;
+ u32 pd = (mpctl0 >> 26) & 0xf;
+
+ mfi = mfi<=5 ? 5 : mfi;
+
+ return (2*(CONFIG_SYS_CLK_FREQ>>10)*( (mfi<<10) + (mfn<<10)/(mfd+1)))/(pd+1);
+}
+
+ulong get_FCLK(void)
+{
+ return (( CSCR>>15)&1) ? get_mcuPLLCLK()>>1 : get_mcuPLLCLK();
+}
+
+/* return HCLK frequency */
+ulong get_HCLK(void)
+{
+ u32 bclkdiv = (( CSCR >> 10 ) & 0xf) + 1;
+ printf("bclkdiv: %d\n", bclkdiv);
+ return get_systemPLLCLK() / bclkdiv;
+}
+
+/* return BCLK frequency */
+ulong get_BCLK(void)
+{
+ return get_HCLK();
+}
+
+ulong get_PERCLK1(void)
+{
+ return get_systemPLLCLK() / (((PCDR) & 0xf)+1);
+}
+
+ulong get_PERCLK2(void)
+{
+ return get_systemPLLCLK() / (((PCDR>>4) & 0xf)+1);
+}
+
+ulong get_PERCLK3(void)
+{
+ return get_systemPLLCLK() / (((PCDR>>16) & 0x7f)+1);
+}
+
+#endif /* defined (CONFIG_IMX) */