1 files changed, 104 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/clock3xxx.c b/arch/arm/mach-omap2/clock3xxx.c
new file mode 100644
index 00000000000..a447c4d2c28
--- /dev/null
+++ b/arch/arm/mach-omap2/clock3xxx.c
@@ -0,0 +1,104 @@
+/*
+ * OMAP3-specific clock framework functions
+ *
+ * Copyright (C) 2007-2008 Texas Instruments, Inc.
+ * Copyright (C) 2007-2010 Nokia Corporation
+ *
+ * Paul Walmsley
+ * Jouni Högander
+ *
+ * Parts of this code are based on code written by
+ * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <plat/clock.h>
+
+#include "clock.h"
+#include "clock3xxx.h"
+#include "prm.h"
+#include "prm-regbits-34xx.h"
+#include "cm.h"
+#include "cm-regbits-34xx.h"
+
+/*
+ * DPLL5_FREQ_FOR_USBHOST: USBHOST and USBTLL are the only clocks
+ * that are sourced by DPLL5, and both of these require this clock
+ * to be at 120 MHz for proper operation.
+ */
+#define DPLL5_FREQ_FOR_USBHOST		120000000
+
+/* needed by omap3_core_dpll_m2_set_rate() */
+struct clk *sdrc_ick_p, *arm_fck_p;
+
+int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
+{
+	/*
+	 * According to the 12-5 CDP code from TI, "Limitation 2.5"
+	 * on 3430ES1 prevents us from changing DPLL multipliers or dividers
+	 * on DPLL4.
+	 */
+	if (omap_rev() == OMAP3430_REV_ES1_0) {
+		pr_err("clock: DPLL4 cannot change rate due to "
+		       "silicon 'Limitation 2.5' on 3430ES1.\n");
+		return -EINVAL;
+	}
+
+	return omap3_noncore_dpll_set_rate(clk, rate);
+}
+
+void __init omap3_clk_lock_dpll5(void)
+{
+	struct clk *dpll5_clk;
+	struct clk *dpll5_m2_clk;
+
+	dpll5_clk = clk_get(NULL, "dpll5_ck");
+	clk_set_rate(dpll5_clk, DPLL5_FREQ_FOR_USBHOST);
+	clk_enable(dpll5_clk);
+
+	/* Enable autoidle to allow it to enter low power bypass */
+	omap3_dpll_allow_idle(dpll5_clk);
+
+	/* Program dpll5_m2_clk divider for no division */
+	dpll5_m2_clk = clk_get(NULL, "dpll5_m2_ck");
+	clk_enable(dpll5_m2_clk);
+	clk_set_rate(dpll5_m2_clk, DPLL5_FREQ_FOR_USBHOST);
+
+	clk_disable(dpll5_m2_clk);
+	clk_disable(dpll5_clk);
+	return;
+}
+
+/* Common clock code */
+
+/*
+ * Switch the MPU rate if specified on cmdline.  We cannot do this
+ * early until cmdline is parsed.  XXX This should be removed from the
+ * clock code and handled by the OPP layer code in the near future.
+ */
+static int __init omap3xxx_clk_arch_init(void)
+{
+	int ret;
+
+	if (!cpu_is_omap34xx())
+		return 0;
+
+	ret = omap2_clk_switch_mpurate_at_boot("dpll1_ck");
+	if (!ret)
+		omap2_clk_print_new_rates("osc_sys_ck", "arm_fck", "core_ck");
+
+	return ret;
+}
+
+arch_initcall(omap3xxx_clk_arch_init);
+
+