1 files changed, 95 insertions, 0 deletions

diff --git a/firmware/target/arm/imx31/ccm-imx31.c b/firmware/target/arm/imx31/ccm-imx31.c
new file mode 100644
index 0000000000..272f00aca9
--- /dev/null
+++ b/firmware/target/arm/imx31/ccm-imx31.c
@@ -0,0 +1,95 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (c) 2008 Michael Sevakis
+ *
+ * Clock control functions for IMX31 processor
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "system.h"
+#include "cpu.h"
+#include "ccm-imx31.h"
+
+unsigned int ccm_get_src_pll(void)
+{
+    return (CCM_PMCR0 & 0xC0000000) == 0 ? PLL_SERIAL : PLL_MCU;
+}
+
+void ccm_module_clock_gating(enum IMX31_CG_LIST cg, enum IMX31_CG_MODES mode)
+{
+    volatile unsigned long *reg;
+    unsigned long mask;
+    int shift;
+
+    if (cg >= CG_NUM_CLOCKS)
+        return;
+
+    reg = &CCM_CGR0 + cg / 16;  /* Select CGR0, CGR1, CGR2 */
+    shift = 2*(cg % 16);        /* Get field shift */
+    mask = CG_MASK << shift;    /* Select field */
+
+    imx31_regmod32(reg, mode << shift, mask);
+}
+
+/* Get the PLL reference clock frequency in HZ */
+unsigned int ccm_get_pll_ref_clk(void)
+{
+    if ((CCM_CCMR & (3 << 1)) == (1 << 1))
+        return CONFIG_CLK32_FREQ * 1024;
+    else
+        return CONFIG_HCLK_FREQ;
+}
+
+/* Return PLL frequency in HZ */
+unsigned int ccm_get_pll(enum IMX31_PLLS pll)
+{
+    uint32_t infreq = ccm_get_pll_ref_clk();
+    uint32_t reg = (&CCM_MPCTL)[pll];
+    uint32_t mfn = reg & 0x3ff;
+    uint32_t pd  = ((reg >> 26) & 0xf) + 1;
+    uint64_t mfd = ((reg >> 16) & 0x3ff) + 1;
+    uint32_t mfi = (reg >> 10) & 0xf;
+
+    mfi = mfi <= 5 ? 5 : mfi;
+
+    return 2*infreq*(mfi * mfd + mfn) / (mfd * pd);
+}
+
+unsigned int ccm_get_ipg_clk(void)
+{
+    unsigned int pllnum = ccm_get_src_pll();
+    unsigned int pll = ccm_get_pll(pllnum);
+    uint32_t reg = CCM_PDR0;
+    unsigned int max_pdf = ((reg >> 3) & 0x7) + 1;
+    unsigned int ipg_pdf = ((reg >> 6) & 0x3) + 1;
+
+    return pll / (max_pdf * ipg_pdf);
+}
+
+unsigned int ccm_get_ahb_clk(void)
+{
+    unsigned int pllnum = ccm_get_src_pll();
+    unsigned int pll = ccm_get_pll(pllnum);
+    unsigned int max_pdf = ((CCM_PDR0 >> 3) & 0x7) + 1;
+
+    return pll / max_pdf;
+}
+
+unsigned int ccm_get_ata_clk(void)
+{
+    return ccm_get_ipg_clk();
+}