OMAP2xxx clock: move the DVFS virtual clock code into mach-omap2/clkt2xxx_virt_prcm_set.c

Move the DVFS virtual clock functions from clock2xxx.c to
mach-omap2/clkt2xxx_virt_prcm_set.c.  This is intended to make the
clock code easier to understand, since all of the functions needed to
manage the virt_prcm_set clock are now located in their own file,
rather than being mixed with other, unrelated functions.

Clock debugging is also now more finely-grained, since the DEBUG macro
can now be defined for the virt_prcm_set clock alone.  This should
reduce unnecessary console noise when debugging.

Also, if at some future point the mach-omap2/ directory is split into
OMAP2/3/4 variants, this clkt file can be placed in the mach-omap2xxx/
directory, rather than shared with other chip types that don't use
this clock type.

Thanks to Alexander Shishkin <virtuoso@slind.org> for his comments.
Thanks also to Kevin Hilman <khilman@deeprootsystems.com> for finding
and fixing a bug with the CONFIG_CPU_FREQ portion of this patch.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Richard Woodruff <r-woodruff2@ti.com>
Cc: Alexander Shishkin <virtuoso@slind.org>
Cc: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 254 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c b/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c
new file mode 100644
index 000000000000..3b1eac4d5390
--- /dev/null
+++ b/arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c
@@ -0,0 +1,254 @@
+/*
+ * OMAP2xxx DVFS virtual clock functions
+ *
+ * Copyright (C) 2005-2008 Texas Instruments, Inc.
+ * Copyright (C) 2004-2010 Nokia Corporation
+ *
+ * Contacts:
+ * Richard Woodruff <r-woodruff2@ti.com>
+ * Paul Walmsley
+ *
+ * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
+ * Gordon McNutt and RidgeRun, Inc.
+ *
+ * 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 this code should be replaceable by the upcoming OPP layer
+ * code.  However, some notion of "rate set" is probably still necessary
+ * for OMAP2xxx at least.  Rate sets should be generalized so they can be
+ * used for any OMAP chip, not just OMAP2xxx.  In particular, Richard Woodruff
+ * has in the past expressed a preference to use rate sets for OPP changes,
+ * rather than dynamically recalculating the clock tree, so if someone wants
+ * this badly enough to write the code to handle it, we should support it
+ * as an option.
+ */
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/cpufreq.h>
+
+#include <plat/clock.h>
+#include <plat/sram.h>
+#include <plat/sdrc.h>
+
+#include "clock.h"
+#include "clock2xxx.h"
+#include "opp2xxx.h"
+#include "cm.h"
+#include "cm-regbits-24xx.h"
+
+const struct prcm_config *curr_prcm_set;
+const struct prcm_config *rate_table;
+
+/**
+ * omap2_table_mpu_recalc - just return the MPU speed
+ * @clk: virt_prcm_set struct clk
+ *
+ * Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set.
+ */
+unsigned long omap2_table_mpu_recalc(struct clk *clk)
+{
+        return 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.
+ */
+long omap2_round_to_table_rate(struct clk *clk, unsigned long rate)
+{
+        const struct prcm_config *ptr;
+        long highest_rate;
+        long sys_ck_rate;
+
+        sys_ck_rate = clk_get_rate(sclk);
+
+        highest_rate = -EINVAL;
+
+        for (ptr = rate_table; ptr->mpu_speed; ptr++) {
+                if (!(ptr->flags & cpu_mask))
+                        continue;
+                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;
+}
+
+/* Sets basic clocks based on the specified rate */
+int omap2_select_table_rate(struct clk *clk, unsigned long rate)
+{
+        u32 cur_rate, done_rate, bypass = 0, tmp;
+        const struct prcm_config *prcm;
+        unsigned long found_speed = 0;
+        unsigned long flags;
+        long sys_ck_rate;
+
+        sys_ck_rate = clk_get_rate(sclk);
+
+        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 = omap2xxx_clk_get_core_rate(dclk);
+
+        if (prcm->dpll_speed == cur_rate / 2) {
+                omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);
+        } else if (prcm->dpll_speed == cur_rate * 2) {
+                omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 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 & OMAP24XX_CORE_CLK_SRC_MASK) ==
+                    CORE_CLK_SRC_DPLL_X2)
+                        done_rate = CORE_CLK_SRC_DPLL_X2;
+                else
+                        done_rate = CORE_CLK_SRC_DPLL;
+
+                /* MPU divider */
+                cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);
+
+                /* dsp + iva1 div(2420), iva2.1(2430) */
+                cm_write_mod_reg(prcm->cm_clksel_dsp,
+                                 OMAP24XX_DSP_MOD, CM_CLKSEL);
+
+                cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);
+
+                /* Major subsystem dividers */
+                tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK;
+                cm_write_mod_reg(prcm->cm_clksel1_core | tmp, CORE_MOD,
+                                 CM_CLKSEL1);
+
+                if (cpu_is_omap2430())
+                        cm_write_mod_reg(prcm->cm_clksel_mdm,
+                                         OMAP2430_MDM_MOD, CM_CLKSEL);
+
+                /* x2 to enter omap2xxx_sdrc_init_params() */
+                omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
+
+                omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
+                               bypass);
+
+                omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
+                omap2xxx_sdrc_reprogram(done_rate, 0);
+
+                local_irq_restore(flags);
+        }
+
+        return 0;
+}
+
+#ifdef CONFIG_CPU_FREQ
+/*
+ * Walk PRCM rate table and fillout cpufreq freq_table
+ * XXX This should be replaced by an OPP layer in the near future
+ */
+static struct cpufreq_frequency_table *freq_table;
+
+void omap2_clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
+{
+        const struct prcm_config *prcm;
+        long sys_ck_rate;
+        int i = 0;
+        int tbl_sz = 0;
+
+        if (!cpu_is_omap24xx())
+                return;
+
+        sys_ck_rate = clk_get_rate(sclk);
+
+        for (prcm = rate_table; prcm->mpu_speed; prcm++) {
+                if (!(prcm->flags & cpu_mask))
+                        continue;
+                if (prcm->xtal_speed != sys_ck_rate)
+                        continue;
+
+                /* don't put bypass rates in table */
+                if (prcm->dpll_speed == prcm->xtal_speed)
+                        continue;
+
+                tbl_sz++;
+        }
+
+        /*
+         * XXX Ensure that we're doing what CPUFreq expects for this error
+         * case and the following one
+         */
+        if (tbl_sz == 0) {
+                pr_warning("%s: no matching entries in rate_table\n",
+                           __func__);
+                return;
+        }
+
+        /* Include the CPUFREQ_TABLE_END terminator entry */
+        tbl_sz++;
+
+        freq_table = kzalloc(sizeof(struct cpufreq_frequency_table) * tbl_sz,
+                             GFP_ATOMIC);
+        if (!freq_table) {
+                pr_err("%s: could not kzalloc frequency table\n", __func__);
+                return;
+        }
+
+        for (prcm = rate_table; prcm->mpu_speed; prcm++) {
+                if (!(prcm->flags & cpu_mask))
+                        continue;
+                if (prcm->xtal_speed != sys_ck_rate)
+                        continue;
+
+                /* don't put bypass rates in table */
+                if (prcm->dpll_speed == prcm->xtal_speed)
+                        continue;
+
+                freq_table[i].index = i;
+                freq_table[i].frequency = prcm->mpu_speed / 1000;
+                i++;
+        }
+
+        freq_table[i].index = i;
+        freq_table[i].frequency = CPUFREQ_TABLE_END;
+
+        *table = &freq_table[0];
+}
+
+void omap2_clk_exit_cpufreq_table(struct cpufreq_frequency_table **table)
+{
+        if (!cpu_is_omap24xx())
+                return;
+
+        kfree(freq_table);
+}
+
+#endif