--- /dev/null
+/*
+ * linux/arch/arm/mach-omap2/clock.c
+ *
+ * Copyright (C) 2005 Texas Instruments Inc.
+ * Richard Woodruff <r-woodruff2@ti.com>
+ * Created for OMAP2.
+ *
+ * Cleaned up and modified to use omap shared clock framework by
+ * Tony Lindgren <tony@atomide.com>
+ *
+ * Based on omap1 clock.c, Copyright (C) 2004 - 2005 Nokia corporation
+ * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.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.
+ */
+#include <linux/config.h>
+#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 <asm/io.h>
+
+#include <asm/arch/clock.h>
+#include <asm/arch/sram.h>
+
+#include "prcm-regs.h"
+#include "memory.h"
+#include "clock.h"
+
+//#define DOWN_VARIABLE_DPLL 1 /* Experimental */
+
+static struct prcm_config *curr_prcm_set;
+static u32 curr_perf_level = PRCM_FULL_SPEED;
+
+/*-------------------------------------------------------------------------
+ * Omap2 specific clock functions
+ *-------------------------------------------------------------------------*/
+
+/* Recalculate SYST_CLK */
+static void omap2_sys_clk_recalc(struct clk * clk)
+{
+ u32 div = PRCM_CLKSRC_CTRL;
+ div &= (1 << 7) | (1 << 6); /* Test if ext clk divided by 1 or 2 */
+ div >>= clk->rate_offset;
+ clk->rate = (clk->parent->rate / div);
+ propagate_rate(clk);
+}
+
+static u32 omap2_get_dpll_rate(struct clk * tclk)
+{
+ long long dpll_clk;
+ int dpll_mult, dpll_div, amult;
+
+ dpll_mult = (CM_CLKSEL1_PLL >> 12) & 0x03ff; /* 10 bits */
+ dpll_div = (CM_CLKSEL1_PLL >> 8) & 0x0f; /* 4 bits */
+ dpll_clk = (long long)tclk->parent->rate * dpll_mult;
+ do_div(dpll_clk, dpll_div + 1);
+ amult = CM_CLKSEL2_PLL & 0x3;
+ dpll_clk *= amult;
+
+ return dpll_clk;
+}
+
+static void omap2_followparent_recalc(struct clk *clk)
+{
+ followparent_recalc(clk);
+}
+
+static void omap2_propagate_rate(struct clk * clk)
+{
+ if (!(clk->flags & RATE_FIXED))
+ clk->rate = clk->parent->rate;
+
+ propagate_rate(clk);
+}
+
+/* Enable an APLL if off */
+static void omap2_clk_fixed_enable(struct clk *clk)
+{
+ u32 cval, i=0;
+
+ if (clk->enable_bit == 0xff) /* Parent will do it */
+ return;
+
+ cval = CM_CLKEN_PLL;
+
+ if ((cval & (0x3 << clk->enable_bit)) == (0x3 << clk->enable_bit))
+ return;
+
+ cval &= ~(0x3 << clk->enable_bit);
+ cval |= (0x3 << clk->enable_bit);
+ CM_CLKEN_PLL = cval;
+
+ if (clk == &apll96_ck)
+ cval = (1 << 8);
+ else if (clk == &apll54_ck)
+ cval = (1 << 6);
+
+ while (!CM_IDLEST_CKGEN & cval) { /* Wait for lock */
+ ++i;
+ udelay(1);
+ if (i == 100000)
+ break;
+ }
+}
+
+/* Enables clock without considering parent dependencies or use count
+ * REVISIT: Maybe change this to use clk->enable like on omap1?
+ */
+static int _omap2_clk_enable(struct clk * clk)
+{
+ u32 regval32;
+
+ if (clk->flags & ALWAYS_ENABLED)
+ return 0;
+
+ if (unlikely(clk->enable_reg == 0)) {
+ printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
+ clk->name);
+ return 0;
+ }
+
+ if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
+ omap2_clk_fixed_enable(clk);
+ return 0;
+ }
+
+ regval32 = __raw_readl(clk->enable_reg);
+ regval32 |= (1 << clk->enable_bit);
+ __raw_writel(regval32, clk->enable_reg);
+
+ return 0;
+}
+
+/* Stop APLL */
+static void omap2_clk_fixed_disable(struct clk *clk)
+{
+ u32 cval;
+
+ if(clk->enable_bit == 0xff) /* let parent off do it */
+ return;
+
+ cval = CM_CLKEN_PLL;
+ cval &= ~(0x3 << clk->enable_bit);
+ CM_CLKEN_PLL = cval;
+}
+
+/* Disables clock without considering parent dependencies or use count */
+static void _omap2_clk_disable(struct clk *clk)
+{
+ u32 regval32;
+
+ if (clk->enable_reg == 0)
+ return;
+
+ if (clk->enable_reg == (void __iomem *)&CM_CLKEN_PLL) {
+ omap2_clk_fixed_disable(clk);
+ return;
+ }
+
+ regval32 = __raw_readl(clk->enable_reg);
+ regval32 &= ~(1 << clk->enable_bit);
+ __raw_writel(regval32, clk->enable_reg);
+}
+
+static int omap2_clk_enable(struct clk *clk)
+{
+ int ret = 0;
+
+ if (clk->usecount++ == 0) {
+ if (likely((u32)clk->parent))
+ ret = omap2_clk_enable(clk->parent);
+
+ if (unlikely(ret != 0)) {
+ clk->usecount--;
+ return ret;
+ }
+
+ ret = _omap2_clk_enable(clk);
+
+ if (unlikely(ret != 0) && clk->parent) {
+ omap2_clk_disable(clk->parent);
+ clk->usecount--;
+ }
+ }
+
+ return ret;
+}
+
+static void omap2_clk_disable(struct clk *clk)
+{
+ if (clk->usecount > 0 && !(--clk->usecount)) {
+ _omap2_clk_disable(clk);
+ if (likely((u32)clk->parent))
+ omap2_clk_disable(clk->parent);
+ }
+}
+
+/*
+ * Uses the current prcm set to tell if a rate is valid.
+ * You can go slower, but not faster within a given rate set.
+ */
+static u32 omap2_dpll_round_rate(unsigned long target_rate)
+{
+ u32 high, low;
+
+ if ((CM_CLKSEL2_PLL & 0x3) == 1) { /* DPLL clockout */
+ high = curr_prcm_set->dpll_speed * 2;
+ low = curr_prcm_set->dpll_speed;
+ } else { /* DPLL clockout x 2 */
+ high = curr_prcm_set->dpll_speed;
+ low = curr_prcm_set->dpll_speed / 2;
+ }
+
+#ifdef DOWN_VARIABLE_DPLL
+ if (target_rate > high)
+ return high;
+ else
+ return target_rate;
+#else
+ if (target_rate > low)
+ return high;
+ else
+ return low;
+#endif
+
+}
+
+/*
+ * Used for clocks that are part of CLKSEL_xyz governed clocks.
+ * REVISIT: Maybe change to use clk->enable() functions like on omap1?
+ */
+static void omap2_clksel_recalc(struct clk * clk)
+{
+ u32 fixed = 0, div = 0;
+
+ if (clk == &dpll_ck) {
+ clk->rate = omap2_get_dpll_rate(clk);
+ fixed = 1;
+ div = 0;
+ }
+
+ if (clk == &iva1_mpu_int_ifck) {
+ div = 2;
+ fixed = 1;
+ }
+
+ if ((clk == &dss1_fck) && ((CM_CLKSEL1_CORE & (0x1f << 8)) == 0)) {
+ clk->rate = sys_ck.rate;
+ return;
+ }
+
+ if (!fixed) {
+ div = omap2_clksel_get_divisor(clk);
+ if (div == 0)
+ return;
+ }
+
+ if (div != 0) {
+ if (unlikely(clk->rate == clk->parent->rate / div))
+ return;
+ clk->rate = clk->parent->rate / div;
+ }
+
+ if (unlikely(clk->flags & RATE_PROPAGATES))
+ propagate_rate(clk);
+}
+
+/*
+ * Finds best divider value in an array based on the source and target
+ * rates. The divider array must be sorted with smallest divider first.
+ */
+static inline u32 omap2_divider_from_table(u32 size, u32 *div_array,
+ u32 src_rate, u32 tgt_rate)
+{
+ int i, test_rate;
+
+ if (div_array == NULL)
+ return ~1;
+
+ for (i=0; i < size; i++) {
+ test_rate = src_rate / *div_array;
+ if (test_rate <= tgt_rate)
+ return *div_array;
+ ++div_array;
+ }
+
+ return ~0; /* No acceptable divider */
+}
+
+/*
+ * Find divisor for the given clock and target rate.
+ *
+ * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
+ * they are only settable as part of virtual_prcm set.
+ */
+static u32 omap2_clksel_round_rate(struct clk *tclk, u32 target_rate,
+ u32 *new_div)
+{
+ u32 gfx_div[] = {2, 3, 4};
+ u32 sysclkout_div[] = {1, 2, 4, 8, 16};
+ u32 dss1_div[] = {1, 2, 3, 4, 5, 6, 8, 9, 12, 16};
+ u32 vylnq_div[] = {1, 2, 3, 4, 6, 8, 9, 12, 16, 18};
+ u32 best_div = ~0, asize = 0;
+ u32 *div_array = NULL;
+
+ switch (tclk->flags & SRC_RATE_SEL_MASK) {
+ case CM_GFX_SEL1:
+ asize = 3;
+ div_array = gfx_div;
+ break;
+ case CM_PLL_SEL1:
+ return omap2_dpll_round_rate(target_rate);
+ case CM_SYSCLKOUT_SEL1:
+ asize = 5;
+ div_array = sysclkout_div;
+ break;
+ case CM_CORE_SEL1:
+ if(tclk == &dss1_fck){
+ if(tclk->parent == &core_ck){
+ asize = 10;
+ div_array = dss1_div;
+ } else {
+ *new_div = 0; /* fixed clk */
+ return(tclk->parent->rate);
+ }
+ } else if((tclk == &vlynq_fck) && cpu_is_omap2420()){
+ if(tclk->parent == &core_ck){
+ asize = 10;
+ div_array = vylnq_div;
+ } else {
+ *new_div = 0; /* fixed clk */
+ return(tclk->parent->rate);
+ }
+ }
+ break;
+ }
+
+ best_div = omap2_divider_from_table(asize, div_array,
+ tclk->parent->rate, target_rate);
+ if (best_div == ~0){
+ *new_div = 1;
+ return best_div; /* signal error */
+ }
+
+ *new_div = best_div;
+ return (tclk->parent->rate / best_div);
+}
+
+/* Given a clock and a rate apply a clock specific rounding function */
+static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
+{
+ u32 new_div = 0;
+ int valid_rate;
+
+ if (clk->flags & RATE_FIXED)
+ return clk->rate;
+
+ if (clk->flags & RATE_CKCTL) {
+ valid_rate = omap2_clksel_round_rate(clk, rate, &new_div);
+ return valid_rate;
+ }
+
+ if (clk->round_rate != 0)
+ return clk->round_rate(clk, rate);
+
+ return clk->rate;
+}
+
+/*
+ * Check the DLL lock state, and return tue if running in unlock mode.
+ * This is needed to compenste for the shifted DLL value in unlock mode.
+ */
+static u32 omap2_dll_force_needed(void)
+{
+ u32 dll_state = SDRC_DLLA_CTRL; /* dlla and dllb are a set */
+
+ if ((dll_state & (1 << 2)) == (1 << 2))
+ return 1;
+ else
+ return 0;
+}
+
+static u32 omap2_reprogram_sdrc(u32 level, u32 force)
+{
+ u32 slow_dll_ctrl, fast_dll_ctrl, m_type;
+ u32 prev = curr_perf_level, flags;
+
+ if ((curr_perf_level == level) && !force)
+ return prev;
+
+ m_type = omap2_memory_get_type();
+ slow_dll_ctrl = omap2_memory_get_slow_dll_ctrl();
+ fast_dll_ctrl = omap2_memory_get_fast_dll_ctrl();
+
+ if (level == PRCM_HALF_SPEED) {
+ local_irq_save(flags);
+ PRCM_VOLTSETUP = 0xffff;
+ omap2_sram_reprogram_sdrc(PRCM_HALF_SPEED,
+ slow_dll_ctrl, m_type);
+ curr_perf_level = PRCM_HALF_SPEED;
+ local_irq_restore(flags);
+ }
+ if (level == PRCM_FULL_SPEED) {
+ local_irq_save(flags);
+ PRCM_VOLTSETUP = 0xffff;
+ omap2_sram_reprogram_sdrc(PRCM_FULL_SPEED,
+ fast_dll_ctrl, m_type);
+ curr_perf_level = PRCM_FULL_SPEED;
+ local_irq_restore(flags);
+ }
+
+ return prev;
+}
+
+static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
+{
+ u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
+ u32 bypass = 0;
+ struct prcm_config tmpset;
+ int ret = -EINVAL;
+
+ local_irq_save(flags);
+ cur_rate = omap2_get_dpll_rate(&dpll_ck);
+ mult = CM_CLKSEL2_PLL & 0x3;
+
+ if ((rate == (cur_rate / 2)) && (mult == 2)) {
+ omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
+ } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
+ omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
+ } else if (rate != cur_rate) {
+ valid_rate = omap2_dpll_round_rate(rate);
+ if (valid_rate != rate)
+ goto dpll_exit;
+
+ if ((CM_CLKSEL2_PLL & 0x3) == 1)
+ low = curr_prcm_set->dpll_speed;
+ else
+ low = curr_prcm_set->dpll_speed / 2;
+
+ tmpset.cm_clksel1_pll = CM_CLKSEL1_PLL;
+ tmpset.cm_clksel1_pll &= ~(0x3FFF << 8);
+ div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
+ tmpset.cm_clksel2_pll = CM_CLKSEL2_PLL;
+ tmpset.cm_clksel2_pll &= ~0x3;
+ if (rate > low) {
+ tmpset.cm_clksel2_pll |= 0x2;
+ mult = ((rate / 2) / 1000000);
+ done_rate = PRCM_FULL_SPEED;
+ } else {
+ tmpset.cm_clksel2_pll |= 0x1;
+ mult = (rate / 1000000);
+ done_rate = PRCM_HALF_SPEED;
+ }
+ tmpset.cm_clksel1_pll |= ((div << 8) | (mult << 12));
+
+ /* Worst case */
+ tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
+
+ if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */
+ bypass = 1;
+
+ omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1); /* For init_mem */
+
+ /* Force dll lock mode */
+ omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
+ bypass);
+
+ /* Errata: ret dll entry state */
+ omap2_init_memory_params(omap2_dll_force_needed());
+ omap2_reprogram_sdrc(done_rate, 0);
+ }
+ omap2_clksel_recalc(&dpll_ck);
+ ret = 0;
+
+dpll_exit:
+ local_irq_restore(flags);
+ return(ret);
+}
+
+/* Just return the MPU speed */
+static void omap2_mpu_recalc(struct clk * clk)
+{
+ clk->rate = curr_prcm_set->mpu_speed;
+}
+
+/*
+ * Look for a rate equal or less than the target rate given a configuration set.
+ *
+ * What's not entirely clear is "which" field represents the key field.
+ * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
+ * just uses the ARM rates.
+ */
+static long omap2_round_to_table_rate(struct clk * clk, unsigned long rate)
+{
+ struct prcm_config * ptr;
+ long highest_rate;
+
+ if (clk != &virt_prcm_set)
+ return -EINVAL;
+
+ highest_rate = -EINVAL;
+
+ for (ptr = rate_table; ptr->mpu_speed; ptr++) {
+ if (ptr->xtal_speed != sys_ck.rate)
+ continue;
+
+ highest_rate = ptr->mpu_speed;
+
+ /* Can check only after xtal frequency check */
+ if (ptr->mpu_speed <= rate)
+ break;
+ }
+ return highest_rate;
+}
+
+/*
+ * omap2_convert_field_to_div() - turn field value into integer divider
+ */
+static u32 omap2_clksel_to_divisor(u32 div_sel, u32 field_val)
+{
+ u32 i;
+ u32 clkout_array[] = {1, 2, 4, 8, 16};
+
+ if ((div_sel & SRC_RATE_SEL_MASK) == CM_SYSCLKOUT_SEL1) {
+ for (i = 0; i < 5; i++) {
+ if (field_val == i)
+ return clkout_array[i];
+ }
+ return ~0;
+ } else
+ return field_val;
+}
+
+/*
+ * Returns the CLKSEL divider register value
+ * REVISIT: This should be cleaned up to work nicely with void __iomem *
+ */
+static u32 omap2_get_clksel(u32 *div_sel, u32 *field_mask,
+ struct clk *clk)
+{
+ int ret = ~0;
+ u32 reg_val, div_off;
+ u32 div_addr = 0;
+ u32 mask = ~0;
+
+ div_off = clk->rate_offset;
+
+ switch ((*div_sel & SRC_RATE_SEL_MASK)) {
+ case CM_MPU_SEL1:
+ div_addr = (u32)&CM_CLKSEL_MPU;
+ mask = 0x1f;
+ break;
+ case CM_DSP_SEL1:
+ div_addr = (u32)&CM_CLKSEL_DSP;
+ if (cpu_is_omap2420()) {
+ if ((div_off == 0) || (div_off == 8))
+ mask = 0x1f;
+ else if (div_off == 5)
+ mask = 0x3;
+ } else if (cpu_is_omap2430()) {
+ if (div_off == 0)
+ mask = 0x1f;
+ else if (div_off == 5)
+ mask = 0x3;
+ }
+ break;
+ case CM_GFX_SEL1:
+ div_addr = (u32)&CM_CLKSEL_GFX;
+ if (div_off == 0)
+ mask = 0x7;
+ break;
+ case CM_MODEM_SEL1:
+ div_addr = (u32)&CM_CLKSEL_MDM;
+ if (div_off == 0)
+ mask = 0xf;
+ break;
+ case CM_SYSCLKOUT_SEL1:
+ div_addr = (u32)&PRCM_CLKOUT_CTRL;
+ if ((div_off == 3) || (div_off = 11))
+ mask= 0x3;
+ break;
+ case CM_CORE_SEL1:
+ div_addr = (u32)&CM_CLKSEL1_CORE;
+ switch (div_off) {
+ case 0: /* l3 */
+ case 8: /* dss1 */
+ case 15: /* vylnc-2420 */
+ case 20: /* ssi */
+ mask = 0x1f; break;
+ case 5: /* l4 */
+ mask = 0x3; break;
+ case 13: /* dss2 */
+ mask = 0x1; break;
+ case 25: /* usb */
+ mask = 0x7; break;
+ }
+ }
+
+ *field_mask = mask;
+
+ if (unlikely(mask == ~0))
+ div_addr = 0;
+
+ *div_sel = div_addr;
+
+ if (unlikely(div_addr == 0))
+ return ret;
+
+ /* Isolate field */
+ reg_val = __raw_readl((void __iomem *)div_addr) & (mask << div_off);
+
+ /* Normalize back to divider value */
+ reg_val >>= div_off;
+
+ return reg_val;
+}
+
+/*
+ * Return divider to be applied to parent clock.
+ * Return 0 on error.
+ */
+static u32 omap2_clksel_get_divisor(struct clk *clk)
+{
+ int ret = 0;
+ u32 div, div_sel, div_off, field_mask, field_val;
+
+ /* isolate control register */
+ div_sel = (SRC_RATE_SEL_MASK & clk->flags);
+
+ div_off = clk->rate_offset;
+ field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
+ if (div_sel == 0)
+ return ret;
+
+ div_sel = (SRC_RATE_SEL_MASK & clk->flags);
+ div = omap2_clksel_to_divisor(div_sel, field_val);
+
+ return div;
+}
+
+/* Set the clock rate for a clock source */
+static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
+
+{
+ int ret = -EINVAL;
+ void __iomem * reg;
+ u32 div_sel, div_off, field_mask, field_val, reg_val, validrate;
+ u32 new_div = 0;
+
+ if (!(clk->flags & CONFIG_PARTICIPANT) && (clk->flags & RATE_CKCTL)) {
+ if (clk == &dpll_ck)
+ return omap2_reprogram_dpll(clk, rate);
+
+ /* Isolate control register */
+ div_sel = (SRC_RATE_SEL_MASK & clk->flags);
+ div_off = clk->src_offset;
+
+ validrate = omap2_clksel_round_rate(clk, rate, &new_div);
+ if(validrate != rate)
+ return(ret);
+
+ field_val = omap2_get_clksel(&div_sel, &field_mask, clk);
+ if (div_sel == 0)
+ return ret;
+
+ if(clk->flags & CM_SYSCLKOUT_SEL1){
+ switch(new_div){
+ case 16: field_val = 4; break;
+ case 8: field_val = 3; break;
+ case 4: field_val = 2; break;
+ case 2: field_val = 1; break;
+ case 1: field_val = 0; break;
+ }
+ }
+ else
+ field_val = new_div;
+
+ reg = (void __iomem *)div_sel;
+
+ reg_val = __raw_readl(reg);
+ reg_val &= ~(field_mask << div_off);
+ reg_val |= (field_val << div_off);
+
+ __raw_writel(reg_val, reg);
+ clk->rate = clk->parent->rate / field_val;
+
+ if (clk->flags & DELAYED_APP)
+ __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
+ ret = 0;
+ } else if (clk->set_rate != 0)
+ ret = clk->set_rate(clk, rate);
+
+ if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
+ propagate_rate(clk);
+
+ return ret;
+}
+
+/* Converts encoded control register address into a full address */
+static u32 omap2_get_src_field(u32 *type_to_addr, u32 reg_offset,
+ struct clk *src_clk, u32 *field_mask)
+{
+ u32 val = ~0, src_reg_addr = 0, mask = 0;
+
+ /* Find target control register.*/
+ switch ((*type_to_addr & SRC_RATE_SEL_MASK)) {
+ case CM_CORE_SEL1:
+ src_reg_addr = (u32)&CM_CLKSEL1_CORE;
+ if (reg_offset == 13) { /* DSS2_fclk */
+ mask = 0x1;
+ if (src_clk == &sys_ck)
+ val = 0;
+ if (src_clk == &func_48m_ck)
+ val = 1;
+ } else if (reg_offset == 8) { /* DSS1_fclk */
+ mask = 0x1f;
+ if (src_clk == &sys_ck)
+ val = 0;
+ else if (src_clk == &core_ck) /* divided clock */
+ val = 0x10; /* rate needs fixing */
+ } else if ((reg_offset == 15) && cpu_is_omap2420()){ /*vlnyq*/
+ mask = 0x1F;
+ if(src_clk == &func_96m_ck)
+ val = 0;
+ else if (src_clk == &core_ck)
+ val = 0x10;
+ }
+ break;
+ case CM_CORE_SEL2:
+ src_reg_addr = (u32)&CM_CLKSEL2_CORE;
+ mask = 0x3;
+ if (src_clk == &func_32k_ck)
+ val = 0x0;
+ if (src_clk == &sys_ck)
+ val = 0x1;
+ if (src_clk == &alt_ck)
+ val = 0x2;
+ break;
+ case CM_WKUP_SEL1:
+ src_reg_addr = (u32)&CM_CLKSEL2_CORE;
+ mask = 0x3;
+ if (src_clk == &func_32k_ck)
+ val = 0x0;
+ if (src_clk == &sys_ck)
+ val = 0x1;
+ if (src_clk == &alt_ck)
+ val = 0x2;
+ break;
+ case CM_PLL_SEL1:
+ src_reg_addr = (u32)&CM_CLKSEL1_PLL;
+ mask = 0x1;
+ if (reg_offset == 0x3) {
+ if (src_clk == &apll96_ck)
+ val = 0;
+ if (src_clk == &alt_ck)
+ val = 1;
+ }
+ else if (reg_offset == 0x5) {
+ if (src_clk == &apll54_ck)
+ val = 0;
+ if (src_clk == &alt_ck)
+ val = 1;
+ }
+ break;
+ case CM_PLL_SEL2:
+ src_reg_addr = (u32)&CM_CLKSEL2_PLL;
+ mask = 0x3;
+ if (src_clk == &func_32k_ck)
+ val = 0x0;
+ if (src_clk == &dpll_ck)
+ val = 0x2;
+ break;
+ case CM_SYSCLKOUT_SEL1:
+ src_reg_addr = (u32)&PRCM_CLKOUT_CTRL;
+ mask = 0x3;
+ if (src_clk == &dpll_ck)
+ val = 0;
+ if (src_clk == &sys_ck)
+ val = 1;
+ if (src_clk == &func_54m_ck)
+ val = 2;
+ if (src_clk == &func_96m_ck)
+ val = 3;
+ break;
+ }
+
+ if (val == ~0) /* Catch errors in offset */
+ *type_to_addr = 0;
+ else
+ *type_to_addr = src_reg_addr;
+ *field_mask = mask;
+
+ return val;
+}
+
+static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
+{
+ void __iomem * reg;
+ u32 src_sel, src_off, field_val, field_mask, reg_val, rate;
+ int ret = -EINVAL;
+
+ if (unlikely(clk->flags & CONFIG_PARTICIPANT))
+ return ret;
+
+ if (clk->flags & SRC_SEL_MASK) { /* On-chip SEL collection */
+ src_sel = (SRC_RATE_SEL_MASK & clk->flags);
+ src_off = clk->src_offset;
+
+ if (src_sel == 0)
+ goto set_parent_error;
+
+ field_val = omap2_get_src_field(&src_sel, src_off, new_parent,
+ &field_mask);
+
+ reg = (void __iomem *)src_sel;
+
+ if (clk->usecount > 0)
+ _omap2_clk_disable(clk);
+
+ /* Set new source value (previous dividers if any in effect) */
+ reg_val = __raw_readl(reg) & ~(field_mask << src_off);
+ reg_val |= (field_val << src_off);
+ __raw_writel(reg_val, reg);
+
+ if (clk->flags & DELAYED_APP)
+ __raw_writel(0x1, (void __iomem *)&PRCM_CLKCFG_CTRL);
+
+ if (clk->usecount > 0)
+ _omap2_clk_enable(clk);
+
+ clk->parent = new_parent;
+
+ /* SRC_RATE_SEL_MASK clocks follow their parents rates.*/
+ if ((new_parent == &core_ck) && (clk == &dss1_fck))
+ clk->rate = new_parent->rate / 0x10;
+ else
+ clk->rate = new_parent->rate;
+
+ if (unlikely(clk->flags & RATE_PROPAGATES))
+ propagate_rate(clk);
+
+ return 0;
+ } else {
+ clk->parent = new_parent;
+ rate = new_parent->rate;
+ omap2_clk_set_rate(clk, rate);
+ ret = 0;
+ }
+
+ set_parent_error:
+ return ret;
+}
+
+/* Sets basic clocks based on the specified rate */
+static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
+{
+ u32 flags, cur_rate, done_rate, bypass = 0;
+ u8 cpu_mask = 0;
+ struct prcm_config *prcm;
+ unsigned long found_speed = 0;
+
+ if (clk != &virt_prcm_set)
+ return -EINVAL;
+
+ /* FIXME: Change cpu_is_omap2420() to cpu_is_omap242x() */
+ if (cpu_is_omap2420())
+ cpu_mask = RATE_IN_242X;
+ else if (cpu_is_omap2430())
+ cpu_mask = RATE_IN_243X;
+
+ for (prcm = rate_table; prcm->mpu_speed; prcm++) {
+ if (!(prcm->flags & cpu_mask))
+ continue;
+
+ if (prcm->xtal_speed != sys_ck.rate)
+ continue;
+
+ if (prcm->mpu_speed <= rate) {
+ found_speed = prcm->mpu_speed;
+ break;
+ }
+ }
+
+ if (!found_speed) {
+ printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
+ rate / 1000000);
+ return -EINVAL;
+ }
+
+ curr_prcm_set = prcm;
+ cur_rate = omap2_get_dpll_rate(&dpll_ck);
+
+ if (prcm->dpll_speed == cur_rate / 2) {
+ omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
+ } else if (prcm->dpll_speed == cur_rate * 2) {
+ omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
+ } else if (prcm->dpll_speed != cur_rate) {
+ local_irq_save(flags);
+
+ if (prcm->dpll_speed == prcm->xtal_speed)
+ bypass = 1;
+
+ if ((prcm->cm_clksel2_pll & 0x3) == 2)
+ done_rate = PRCM_FULL_SPEED;
+ else
+ done_rate = PRCM_HALF_SPEED;
+
+ /* MPU divider */
+ CM_CLKSEL_MPU = prcm->cm_clksel_mpu;
+
+ /* dsp + iva1 div(2420), iva2.1(2430) */
+ CM_CLKSEL_DSP = prcm->cm_clksel_dsp;
+
+ CM_CLKSEL_GFX = prcm->cm_clksel_gfx;
+
+ /* Major subsystem dividers */
+ CM_CLKSEL1_CORE = prcm->cm_clksel1_core;
+ if (cpu_is_omap2430())
+ CM_CLKSEL_MDM = prcm->cm_clksel_mdm;
+
+ /* x2 to enter init_mem */
+ omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
+
+ omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
+ bypass);
+
+ omap2_init_memory_params(omap2_dll_force_needed());
+ omap2_reprogram_sdrc(done_rate, 0);
+
+ local_irq_restore(flags);
+ }
+ omap2_clksel_recalc(&dpll_ck);
+
+ return 0;
+}
+
+/*-------------------------------------------------------------------------
+ * Omap2 clock reset and init functions
+ *-------------------------------------------------------------------------*/
+
+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,
+};
+
+static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
+{
+ u32 div, aplls, sclk = 13000000;
+
+ aplls = CM_CLKSEL1_PLL;
+ aplls &= ((1 << 23) | (1 << 24) | (1 << 25));
+ aplls >>= 23; /* Isolate field, 0,2,3 */
+
+ if (aplls == 0)
+ sclk = 19200000;
+ else if (aplls == 2)
+ sclk = 13000000;
+ else if (aplls == 3)
+ sclk = 12000000;
+
+ div = PRCM_CLKSRC_CTRL;
+ div &= ((1 << 7) | (1 << 6));
+ div >>= sys->rate_offset;
+
+ osc->rate = sclk * div;
+ sys->rate = sclk;
+}
+
+#ifdef CONFIG_OMAP_RESET_CLOCKS
+static void __init omap2_disable_unused_clocks(void)
+{
+ struct clk *ck;
+ u32 regval32;
+
+ list_for_each_entry(ck, &clocks, node) {
+ if (ck->usecount > 0 || (ck->flags & ALWAYS_ENABLED) ||
+ ck->enable_reg == 0)
+ continue;
+
+ regval32 = __raw_readl(ck->enable_reg);
+ if ((regval32 & (1 << ck->enable_bit)) == 0)
+ continue;
+
+ printk(KERN_INFO "Disabling unused clock \"%s\"\n", ck->name);
+ _omap2_clk_disable(ck);
+ }
+}
+late_initcall(omap2_disable_unused_clocks);
+#endif
+
+/*
+ * 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;
+
+ if (omap2_select_table_rate(&virt_prcm_set, mpurate))
+ printk(KERN_ERR "Could not find matching MPU rate\n");
+
+ propagate_rate(&osc_ck); /* update main root fast */
+ propagate_rate(&func_32k_ck); /* update main root slow */
+
+ printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
+ "%ld.%01ld/%ld/%ld MHz\n",
+ (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
+ (dpll_ck.rate / 1000000), (mpu_ck.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;
+
+ clk_init(&omap2_clk_functions);
+ omap2_get_crystal_rate(&osc_ck, &sys_ck);
+
+ for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
+ clkp++) {
+
+ if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
+ clk_register(*clkp);
+ continue;
+ }
+
+ if ((*clkp)->flags & CLOCK_IN_OMAP243X && cpu_is_omap2430()) {
+ clk_register(*clkp);
+ continue;
+ }
+ }
+
+ /* Check the MPU rate set by bootloader */
+ clkrate = omap2_get_dpll_rate(&dpll_ck);
+ for (prcm = rate_table; prcm->mpu_speed; prcm++) {
+ if (prcm->xtal_speed != sys_ck.rate)
+ continue;
+ if (prcm->dpll_speed <= clkrate)
+ break;
+ }
+ curr_prcm_set = prcm;
+
+ propagate_rate(&osc_ck); /* update main root fast */
+ propagate_rate(&func_32k_ck); /* update main root slow */
+
+ printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
+ "%ld.%01ld/%ld/%ld MHz\n",
+ (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
+ (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
+
+ /*
+ * Only enable those clocks we will need, let the drivers
+ * enable other clocks as necessary
+ */
+ clk_enable(&sync_32k_ick);
+ clk_enable(&omapctrl_ick);
+ if (cpu_is_omap2430())
+ clk_enable(&sdrc_ick);
+
+ return 0;
+}
git://git.onelab.eu / linux-2.6.git / blobdiff