[PATCHv4 09/33] CLK: omap: add omap4 clock init file

[Tero Kristo]

clk-44xx.c now contains the clock init functionality for omap4, including
DT clock registration and adding of static clkdev entries.

Signed-off-by: Tero Kristo <t-kristo at ti.com>
---
 drivers/clk/omap/clk-44xx.c |  118 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 drivers/clk/omap/clk-44xx.c

diff --git a/drivers/clk/omap/clk-44xx.c b/drivers/clk/omap/clk-44xx.c
new file mode 100644
index 0000000..cc12134
--- /dev/null
+++ b/drivers/clk/omap/clk-44xx.c
@@ -0,0 +1,118 @@
+/*
+ * OMAP4 Clock data
+ *
+ * Copyright (C) 2009-2012 Texas Instruments, Inc.
+ * Copyright (C) 2009-2010 Nokia Corporation
+ *
+ * Paul Walmsley (paul at pwsan.com)
+ * Rajendra Nayak (rnayak at ti.com)
+ * Benoit Cousson (b-cousson at ti.com)
+ * Mike Turquette (mturquette at ti.com)
+ *
+ * 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.
+ *
+ * XXX Some of the ES1 clocks have been removed/changed; once support
+ * is added for discriminating clocks by ES level, these should be added back
+ * in.
+ *
+ * XXX All of the remaining MODULEMODE clock nodes should be removed
+ * once the drivers are updated to use pm_runtime or to use the appropriate
+ * upstream clock node for rate/parent selection.
+ */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/clk-private.h>
+#include <linux/clkdev.h>
+#include <linux/io.h>
+#include <linux/clk/omap.h>
+
+/*
+ * OMAP4 ABE DPLL default frequency. In OMAP4460 TRM version V, section
+ * "3.6.3.2.3 CM1_ABE Clock Generator" states that the "DPLL_ABE_X2_CLK
+ * must be set to 196.608 MHz" and hence, the DPLL locked frequency is
+ * half of this value.
+ */
+#define OMAP4_DPLL_ABE_DEFFREQ				98304000
+
+/*
+ * OMAP4 USB DPLL default frequency. In OMAP4430 TRM version V, section
+ * "3.6.3.9.5 DPLL_USB Preferred Settings" shows that the preferred
+ * locked frequency for the USB DPLL is 960MHz.
+ */
+#define OMAP4_DPLL_USB_DEFFREQ				960000000
+
+static struct omap_dt_clk omap44xx_clks[] = {
+	DT_CLK("smp_twd",	NULL,			"mpu_periphclk"),
+	DT_CLK("omapdss_dss", "ick", "dss_fck"),
+	DT_CLK("usbhs_omap", "fs_fck", "usb_host_fs_fck"),
+	DT_CLK("usbhs_omap", "hs_fck", "usb_host_hs_fck"),
+	DT_CLK("usbhs_omap", "usbtll_ick", "usb_tll_hs_ick"),
+	DT_CLK("usbhs_tll", "usbtll_ick", "usb_tll_hs_ick"),
+	DT_CLK(NULL,	"timer_32k_ck",	"sys_32k_ck"),
+	/* TODO: Remove "omap_timer.X" aliases once DT migration is complete */
+	DT_CLK("omap_timer.1",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("omap_timer.2",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("omap_timer.3",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("omap_timer.4",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("omap_timer.9",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("omap_timer.10",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("omap_timer.11",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("omap_timer.5",	"timer_sys_ck",	"syc_clk_div_ck"),
+	DT_CLK("omap_timer.6",	"timer_sys_ck",	"syc_clk_div_ck"),
+	DT_CLK("omap_timer.7",	"timer_sys_ck",	"syc_clk_div_ck"),
+	DT_CLK("omap_timer.8",	"timer_sys_ck",	"syc_clk_div_ck"),
+	DT_CLK("4a318000.timer",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("48032000.timer",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("48034000.timer",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("48036000.timer",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("4803e000.timer",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("48086000.timer",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("48088000.timer",	"timer_sys_ck",	"sys_clkin_ck"),
+	DT_CLK("40138000.timer",	"timer_sys_ck",	"syc_clk_div_ck"),
+	DT_CLK("4013a000.timer",	"timer_sys_ck",	"syc_clk_div_ck"),
+	DT_CLK("4013c000.timer",	"timer_sys_ck",	"syc_clk_div_ck"),
+	DT_CLK("4013e000.timer",	"timer_sys_ck",	"syc_clk_div_ck"),
+	DT_CLK(NULL,	"cpufreq_ck",	"dpll_mpu_ck"),
+};
+
+int __init omap4xxx_clk_init(void)
+{
+	int rc;
+	struct clk *abe_dpll_ref, *abe_dpll, *sys_32k_ck, *usb_dpll;
+
+	/* FIXME register clocks from DT first */
+	dt_omap_clk_init();
+
+	omap_dt_clocks_register(omap44xx_clks, ARRAY_SIZE(omap44xx_clks));
+
+	omap2_clk_disable_autoidle_all();
+
+	/*
+	 * On OMAP4460 the ABE DPLL fails to turn on if in idle low-power
+	 * state when turning the ABE clock domain. Workaround this by
+	 * locking the ABE DPLL on boot.
+	 * Lock the ABE DPLL in any case to avoid issues with audio.
+	 */
+	abe_dpll_ref = clk_get_sys(NULL, "abe_dpll_refclk_mux_ck");
+	sys_32k_ck = clk_get_sys(NULL, "sys_32k_ck");
+	rc = clk_set_parent(abe_dpll_ref, sys_32k_ck);
+	abe_dpll = clk_get_sys(NULL, "dpll_abe_ck");
+	if (!rc)
+		rc = clk_set_rate(abe_dpll, OMAP4_DPLL_ABE_DEFFREQ);
+	if (rc)
+		pr_err("%s: failed to configure ABE DPLL!\n", __func__);
+
+	/*
+	 * Lock USB DPLL on OMAP4 devices so that the L3INIT power
+	 * domain can transition to retention state when not in use.
+	 */
+	usb_dpll = clk_get_sys(NULL, "dpll_usb_ck");
+	rc = clk_set_rate(usb_dpll, OMAP4_DPLL_USB_DEFFREQ);
+	if (rc)
+		pr_err("%s: failed to configure USB DPLL!\n", __func__);
+
+	return 0;
+}
-- 
1.7.9.5