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+/*
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+ * OMAP Voltage Controller (VC) interface
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+ *
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+ * Copyright (C) 2011 Texas Instruments, Inc.
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+ *
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+ * This file is licensed under the terms of the GNU General Public
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+ * License version 2. This program is licensed "as is" without any
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+ * warranty of any kind, whether express or implied.
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+ */
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+#include <linux/kernel.h>
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+#include <linux/delay.h>
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+#include <linux/init.h>
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+#include <linux/bug.h>
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+#include <linux/io.h>
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+
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+#include <asm/div64.h>
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+
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+#include "iomap.h"
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+#include "soc.h"
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+#include "voltage.h"
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+#include "vc.h"
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+#include "prm-regbits-34xx.h"
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+#include "prm-regbits-44xx.h"
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+#include "prm44xx.h"
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+#include "pm.h"
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+#include "scrm44xx.h"
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+#include "control.h"
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+
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+/**
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+ * struct omap_vc_channel_cfg - describe the cfg_channel bitfield
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+ * @sa: bit for slave address
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+ * @rav: bit for voltage configuration register
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+ * @rac: bit for command configuration register
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+ * @racen: enable bit for RAC
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+ * @cmd: bit for command value set selection
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+ *
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+ * Channel configuration bits, common for OMAP3+
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+ * OMAP3 register: PRM_VC_CH_CONF
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+ * OMAP4 register: PRM_VC_CFG_CHANNEL
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+ * OMAP5 register: PRM_VC_SMPS_<voltdm>_CONFIG
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+ */
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+struct omap_vc_channel_cfg {
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+ u8 sa;
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+ u8 rav;
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+ u8 rac;
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+ u8 racen;
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+ u8 cmd;
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+};
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+
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+static struct omap_vc_channel_cfg vc_default_channel_cfg = {
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+ .sa = BIT(0),
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+ .rav = BIT(1),
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+ .rac = BIT(2),
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+ .racen = BIT(3),
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+ .cmd = BIT(4),
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+};
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+
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+/*
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+ * On OMAP3+, all VC channels have the above default bitfield
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+ * configuration, except the OMAP4 MPU channel. This appears
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+ * to be a freak accident as every other VC channel has the
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+ * default configuration, thus creating a mutant channel config.
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+ */
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+static struct omap_vc_channel_cfg vc_mutant_channel_cfg = {
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+ .sa = BIT(0),
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+ .rav = BIT(2),
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+ .rac = BIT(3),
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+ .racen = BIT(4),
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+ .cmd = BIT(1),
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+};
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+
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+static struct omap_vc_channel_cfg *vc_cfg_bits;
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+
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+/* Default I2C trace length on pcb, 6.3cm. Used for capacitance calculations. */
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+static u32 sr_i2c_pcb_length = 63;
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+#define CFG_CHANNEL_MASK 0x1f
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+
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+/**
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+ * omap_vc_config_channel - configure VC channel to PMIC mappings
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+ * @voltdm: pointer to voltagdomain defining the desired VC channel
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+ *
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+ * Configures the VC channel to PMIC mappings for the following
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+ * PMIC settings
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+ * - i2c slave address (SA)
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+ * - voltage configuration address (RAV)
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+ * - command configuration address (RAC) and enable bit (RACEN)
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+ * - command values for ON, ONLP, RET and OFF (CMD)
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+ *
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+ * This function currently only allows flexible configuration of the
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+ * non-default channel. Starting with OMAP4, there are more than 2
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+ * channels, with one defined as the default (on OMAP4, it's MPU.)
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+ * Only the non-default channel can be configured.
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+ */
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+static int omap_vc_config_channel(struct voltagedomain *voltdm)
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+{
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+ struct omap_vc_channel *vc = voltdm->vc;
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+
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+ /*
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+ * For default channel, the only configurable bit is RACEN.
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+ * All others must stay at zero (see function comment above.)
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+ */
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+ if (vc->flags & OMAP_VC_CHANNEL_DEFAULT)
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+ vc->cfg_channel &= vc_cfg_bits->racen;
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+
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