--- /dev/null
+/*
+ * OMAP3-specific clock framework functions
+ *
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ * Copyright (C) 2007 Nokia Corporation
+ *
+ * Written by Paul Walmsley
+ *
+ * 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/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <asm/arch/clock.h>
+#include <asm/arch/sram.h>
+#include <asm/div64.h>
+#include <asm/bitops.h>
+
+#include "memory.h"
+#include "clock.h"
+#include "clock34xx.h"
+#include "prm.h"
+#include "prm-regbits-34xx.h"
+#include "cm.h"
+#include "cm-regbits-34xx.h"
+
+/* CM_CLKEN_PLL*.EN* bit values */
+#define DPLL_LOCKED 0x7
+
+/**
+ * omap3_dpll_recalc - recalculate DPLL rate
+ * @clk: DPLL struct clk
+ *
+ * Recalculate and propagate the DPLL rate.
+ */
+static void omap3_dpll_recalc(struct clk *clk)
+{
+ clk->rate = omap2_get_dpll_rate(clk);
+
+ propagate_rate(clk);
+}
+
+/**
+ * omap3_clkoutx2_recalc - recalculate DPLL X2 output virtual clock rate
+ * @clk: DPLL output struct clk
+ *
+ * Using parent clock DPLL data, look up DPLL state. If locked, set our
+ * rate to the dpll_clk * 2; otherwise, just use dpll_clk.
+ */
+static void omap3_clkoutx2_recalc(struct clk *clk)
+{
+ const struct dpll_data *dd;
+ u32 v;
+ struct clk *pclk;
+
+ /* Walk up the parents of clk, looking for a DPLL */
+ pclk = clk->parent;
+ while (pclk && !pclk->dpll_data)
+ pclk = pclk->parent;
+
+ /* clk does not have a DPLL as a parent? */
+ WARN_ON(!pclk);
+
+ dd = pclk->dpll_data;
+
+ WARN_ON(!dd->control_reg || !dd->enable_mask);
+
+ v = __raw_readl(dd->control_reg) & dd->enable_mask;
+ v >>= __ffs(dd->enable_mask);
+ if (v != DPLL_LOCKED)
+ clk->rate = clk->parent->rate;
+ else
+ clk->rate = clk->parent->rate * 2;
+
+ if (clk->flags & RATE_PROPAGATES)
+ propagate_rate(clk);
+}
+
+/*
+ * As it is structured now, this will prevent an OMAP2/3 multiboot
+ * kernel from compiling. This will need further attention.
+ */
+#if defined(CONFIG_ARCH_OMAP3)
+
+static struct clk_functions omap2_clk_functions = {
+ .clk_enable = omap2_clk_enable,
+ .clk_disable = omap2_clk_disable,
+ .clk_round_rate = omap2_clk_round_rate,
+ .clk_set_rate = omap2_clk_set_rate,
+ .clk_set_parent = omap2_clk_set_parent,
+ .clk_disable_unused = omap2_clk_disable_unused,
+};
+
+/*
+ * Set clocks for bypass mode for reboot to work.
+ */
+void omap2_clk_prepare_for_reboot(void)
+{
+ /* REVISIT: Not ready for 343x */
+#if 0
+ u32 rate;
+
+ if (vclk == NULL || sclk == NULL)
+ return;
+
+ rate = clk_get_rate(sclk);
+ clk_set_rate(vclk, rate);
+#endif
+}
+
+/* REVISIT: Move this init stuff out into clock.c */
+
+/*
+ * Switch the MPU rate if specified on cmdline.
+ * We cannot do this early until cmdline is parsed.
+ */
+static int __init omap2_clk_arch_init(void)
+{
+ if (!mpurate)
+ return -EINVAL;
+
+ /* REVISIT: not yet ready for 343x */
+#if 0
+ if (omap2_select_table_rate(&virt_prcm_set, mpurate))
+ printk(KERN_ERR "Could not find matching MPU rate\n");
+#endif
+
+ recalculate_root_clocks();
+
+ printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL3/MPU): "
+ "%ld.%01ld/%ld/%ld MHz\n",
+ (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10,
+ (core_ck.rate / 1000000), (dpll1_fck.rate / 1000000)) ;
+
+ return 0;
+}
+arch_initcall(omap2_clk_arch_init);
+
+int __init omap2_clk_init(void)
+{
+ /* struct prcm_config *prcm; */
+ struct clk **clkp;
+ /* u32 clkrate; */
+ u32 cpu_clkflg;
+
+ /* REVISIT: Ultimately this will be used for multiboot */
+#if 0
+ if (cpu_is_omap242x()) {
+ cpu_mask = RATE_IN_242X;
+ cpu_clkflg = CLOCK_IN_OMAP242X;
+ clkp = onchip_24xx_clks;
+ } else if (cpu_is_omap2430()) {
+ cpu_mask = RATE_IN_243X;
+ cpu_clkflg = CLOCK_IN_OMAP243X;
+ clkp = onchip_24xx_clks;
+ }
+#endif
+ if (cpu_is_omap34xx()) {
+ cpu_mask = RATE_IN_343X;
+ cpu_clkflg = CLOCK_IN_OMAP343X;
+ clkp = onchip_34xx_clks;
+
+ /*
+ * Update this if there are further clock changes between ES2
+ * and production parts
+ */
+ if (is_sil_rev_equal_to(OMAP3430_REV_ES1_0)) {
+ /* No 3430ES1-only rates exist, so no RATE_IN_3430ES1 */
+ cpu_clkflg |= CLOCK_IN_OMAP3430ES1;
+ } else {
+ cpu_mask |= RATE_IN_3430ES2;
+ cpu_clkflg |= CLOCK_IN_OMAP3430ES2;
+ }
+ }
+
+ clk_init(&omap2_clk_functions);
+
+ for (clkp = onchip_34xx_clks;
+ clkp < onchip_34xx_clks + ARRAY_SIZE(onchip_34xx_clks);
+ clkp++) {
+ if ((*clkp)->flags & cpu_clkflg)
+ clk_register(*clkp);
+ }
+
+ /* REVISIT: Not yet ready for OMAP3 */
+#if 0
+ /* Check the MPU rate set by bootloader */
+ clkrate = omap2_get_dpll_rate_24xx(&dpll_ck);
+ for (prcm = rate_table; prcm->mpu_speed; prcm++) {
+ if (!(prcm->flags & cpu_mask))
+ continue;
+ if (prcm->xtal_speed != sys_ck.rate)
+ continue;
+ if (prcm->dpll_speed <= clkrate)
+ break;
+ }
+ curr_prcm_set = prcm;
+#endif
+
+ recalculate_root_clocks();
+
+ printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
+ "%ld.%01ld/%ld/%ld MHz\n",
+ (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10,
+ (core_ck.rate / 1000000), (dpll1_fck.rate / 1000000)) ;
+
+ /*
+ * Only enable those clocks we will need, let the drivers
+ * enable other clocks as necessary
+ */
+ clk_enable_init_clocks();
+
+ /* Avoid sleeping during omap2_clk_prepare_for_reboot() */
+ /* REVISIT: not yet ready for 343x */
+#if 0
+ vclk = clk_get(NULL, "virt_prcm_set");
+ sclk = clk_get(NULL, "sys_ck");
+#endif
+ return 0;
+}
+
+#endif
projects / linux-beck.git / commitdiff