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@@ -0,0 +1,910 @@
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+/*
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+ * Texas Instruments SoC Adaptive Body Bias(ABB) Regulator
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+ *
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+ * Copyright (C) 2011 Texas Instruments, Inc.
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+ * Mike Turquette <mturquette@ti.com>
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+ *
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+ * Copyright (C) 2012-2013 Texas Instruments, Inc.
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+ * Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
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+ * Nishanth Menon <nm@ti.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
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+ * kind, whether express or implied; without even the implied warranty
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+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+#include <linux/clk.h>
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+#include <linux/delay.h>
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+#include <linux/err.h>
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+#include <linux/io.h>
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+#include <linux/module.h>
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+#include <linux/of_device.h>
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+#include <linux/of.h>
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+#include <linux/platform_device.h>
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+#include <linux/regulator/driver.h>
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+#include <linux/regulator/machine.h>
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+#include <linux/regulator/of_regulator.h>
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+
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+/*
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+ * ABB LDO operating states:
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+ * NOMINAL_OPP: bypasses the ABB LDO
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+ * FAST_OPP: sets ABB LDO to Forward Body-Bias
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+ * SLOW_OPP: sets ABB LDO to Reverse Body-Bias
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+ */
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+#define TI_ABB_NOMINAL_OPP 0
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+#define TI_ABB_FAST_OPP 1
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+#define TI_ABB_SLOW_OPP 3
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+
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+/**
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+ * struct ti_abb_info - ABB information per voltage setting
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+ * @opp_sel: one of TI_ABB macro
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+ * @vset: (optional) vset value that LDOVBB needs to be overriden with.
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+ *
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+ * Array of per voltage entries organized in the same order as regulator_desc's
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+ * volt_table list. (selector is used to index from this array)
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+ */
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+struct ti_abb_info {
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+ u32 opp_sel;
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+ u32 vset;
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+};
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+
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+/**
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+ * struct ti_abb_reg - Register description for ABB block
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+ * @setup_reg: setup register offset from base
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+ * @control_reg: control register offset from base
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+ * @sr2_wtcnt_value_mask: setup register- sr2_wtcnt_value mask
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+ * @fbb_sel_mask: setup register- FBB sel mask
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+ * @rbb_sel_mask: setup register- RBB sel mask
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+ * @sr2_en_mask: setup register- enable mask
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+ * @opp_change_mask: control register - mask to trigger LDOVBB change
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+ * @opp_sel_mask: control register - mask for mode to operate
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+ */
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+struct ti_abb_reg {
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+ u32 setup_reg;
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+ u32 control_reg;
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+
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+ /* Setup register fields */
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+ u32 sr2_wtcnt_value_mask;
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+ u32 fbb_sel_mask;
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+ u32 rbb_sel_mask;
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+ u32 sr2_en_mask;
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+
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+ /* Control register fields */
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+ u32 opp_change_mask;
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+ u32 opp_sel_mask;
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+};
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+
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+/**
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+ * struct ti_abb - ABB instance data
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+ * @rdesc: regulator descriptor
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+ * @clk: clock(usually sysclk) supplying ABB block
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+ * @base: base address of ABB block
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+ * @int_base: interrupt register base address
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+ * @efuse_base: (optional) efuse base address for ABB modes
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+ * @ldo_base: (optional) LDOVBB vset override base address
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+ * @regs: pointer to struct ti_abb_reg for ABB block
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+ * @txdone_mask: mask on int_base for tranxdone interrupt
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+ * @ldovbb_override_mask: mask to ldo_base for overriding default LDO VBB
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+ * vset with value from efuse
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+ * @ldovbb_vset_mask: mask to ldo_base for providing the VSET override
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+ * @info: array to per voltage ABB configuration
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+ * @current_info_idx: current index to info
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+ * @settling_time: SoC specific settling time for LDO VBB
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+ */
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+struct ti_abb {
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+ struct regulator_desc rdesc;
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+ struct clk *clk;
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+ void __iomem *base;
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+ void __iomem *int_base;
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+ void __iomem *efuse_base;
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+ void __iomem *ldo_base;
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+
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+ const struct ti_abb_reg *regs;
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+ u32 txdone_mask;
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+ u32 ldovbb_override_mask;
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+ u32 ldovbb_vset_mask;
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+
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+ struct ti_abb_info *info;
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+ int current_info_idx;
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+
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+ u32 settling_time;
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+};
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+
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+/**
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+ * ti_abb_rmw() - handy wrapper to set specific register bits
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+ * @mask: mask for register field
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+ * @value: value shifted to mask location and written
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+ * @offset: offset of register
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+ * @base: base address
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+ *
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+ * Return: final register value (may be unused)
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+ */
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+static inline u32 ti_abb_rmw(u32 mask, u32 value, u32 offset,
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+ void __iomem *base)
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+{
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+ u32 val;
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+
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+ val = readl(base + offset);
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+ val &= ~mask;
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+ val |= (value << __ffs(mask)) & mask;
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+ writel(val, base + offset);
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+
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+ return val;
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+}
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+
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+/**
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+ * ti_abb_check_txdone() - handy wrapper to check ABB tranxdone status
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+ * @abb: pointer to the abb instance
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+ *
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+ * Return: true or false
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+ */
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+static inline bool ti_abb_check_txdone(const struct ti_abb *abb)
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+{
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+ return !!(readl(abb->int_base) & abb->txdone_mask);
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+}
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+
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+/**
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+ * ti_abb_clear_txdone() - handy wrapper to clear ABB tranxdone status
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+ * @abb: pointer to the abb instance
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+ */
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+static inline void ti_abb_clear_txdone(const struct ti_abb *abb)
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+{
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+ writel(abb->txdone_mask, abb->int_base);
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+};
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+
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+/**
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+ * ti_abb_wait_tranx() - waits for ABB tranxdone event
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+ * @dev: device
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+ * @abb: pointer to the abb instance
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+ *
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+ * Return: 0 on success or -ETIMEDOUT if the event is not cleared on time.
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+ */
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+static int ti_abb_wait_txdone(struct device *dev, struct ti_abb *abb)
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+{
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+ int timeout = 0;
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+ bool status;
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+
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+ while (timeout++ <= abb->settling_time) {
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+ status = ti_abb_check_txdone(abb);
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+ if (status)
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+ break;
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+
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+ udelay(1);
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+ }
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+
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+ if (timeout > abb->settling_time) {
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+ dev_warn_ratelimited(dev,
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+ "%s:TRANXDONE timeout(%duS) int=0x%08x\n",
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+ __func__, timeout, readl(abb->int_base));
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+ return -ETIMEDOUT;
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+ }
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+
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+ return 0;
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+}
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+
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+/**
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+ * ti_abb_clear_all_txdone() - clears ABB tranxdone event
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+ * @dev: device
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+ * @abb: pointer to the abb instance
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+ *
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+ * Return: 0 on success or -ETIMEDOUT if the event is not cleared on time.
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+ */
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+static int ti_abb_clear_all_txdone(struct device *dev, const struct ti_abb *abb)
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+{
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+ int timeout = 0;
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+ bool status;
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+
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+ while (timeout++ <= abb->settling_time) {
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+ ti_abb_clear_txdone(abb);
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+
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+ status = ti_abb_check_txdone(abb);
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+ if (!status)
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+ break;
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+
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+ udelay(1);
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+ }
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+
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+ if (timeout > abb->settling_time) {
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+ dev_warn_ratelimited(dev,
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+ "%s:TRANXDONE timeout(%duS) int=0x%08x\n",
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+ __func__, timeout, readl(abb->int_base));
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+ return -ETIMEDOUT;
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+ }
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+
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+ return 0;
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+}
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+
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+/**
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+ * ti_abb_program_ldovbb() - program LDOVBB register for override value
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+ * @dev: device
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+ * @abb: pointer to the abb instance
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+ * @info: ABB info to program
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+ */
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+static void ti_abb_program_ldovbb(struct device *dev, const struct ti_abb *abb,
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+ struct ti_abb_info *info)
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+{
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+ u32 val;
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+
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+ val = readl(abb->ldo_base);
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+ /* clear up previous values */
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+ val &= ~(abb->ldovbb_override_mask | abb->ldovbb_vset_mask);
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+
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+ switch (info->opp_sel) {
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+ case TI_ABB_SLOW_OPP:
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+ case TI_ABB_FAST_OPP:
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+ val |= abb->ldovbb_override_mask;
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+ val |= info->vset << __ffs(abb->ldovbb_vset_mask);
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+ break;
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+ }
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+
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+ writel(val, abb->ldo_base);
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+}
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+
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+/**
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+ * ti_abb_set_opp() - Setup ABB and LDO VBB for required bias
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+ * @rdev: regulator device
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+ * @abb: pointer to the abb instance
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+ * @info: ABB info to program
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+ *
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+ * Return: 0 on success or appropriate error value when fails
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+ */
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+static int ti_abb_set_opp(struct regulator_dev *rdev, struct ti_abb *abb,
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+ struct ti_abb_info *info)
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+{
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+ const struct ti_abb_reg *regs = abb->regs;
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+ struct device *dev = &rdev->dev;
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+ int ret;
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+
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+ ret = ti_abb_clear_all_txdone(dev, abb);
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+ if (ret)
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+ goto out;
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+
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+ ti_abb_rmw(regs->fbb_sel_mask | regs->rbb_sel_mask, 0, regs->setup_reg,
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+ abb->base);
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+
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+ switch (info->opp_sel) {
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+ case TI_ABB_SLOW_OPP:
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+ ti_abb_rmw(regs->rbb_sel_mask, 1, regs->setup_reg, abb->base);
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+ break;
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+ case TI_ABB_FAST_OPP:
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+ ti_abb_rmw(regs->fbb_sel_mask, 1, regs->setup_reg, abb->base);
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+ break;
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+ }
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+
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+ /* program next state of ABB ldo */
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+ ti_abb_rmw(regs->opp_sel_mask, info->opp_sel, regs->control_reg,
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+ abb->base);
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+
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+ /* program LDO VBB vset override if needed */
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+ if (abb->ldo_base)
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+ ti_abb_program_ldovbb(dev, abb, info);
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+
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+ /* Initiate ABB ldo change */
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+ ti_abb_rmw(regs->opp_change_mask, 1, regs->control_reg, abb->base);
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+
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+ /* Wait for ABB LDO to complete transition to new Bias setting */
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+ ret = ti_abb_wait_txdone(dev, abb);
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+ if (ret)
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+ goto out;
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+
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+ ret = ti_abb_clear_all_txdone(dev, abb);
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+ if (ret)
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+ goto out;
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+
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+out:
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+ return ret;
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+}
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+
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+/**
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+ * ti_abb_set_voltage_sel() - regulator accessor function to set ABB LDO
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+ * @rdev: regulator device
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+ * @sel: selector to index into required ABB LDO settings (maps to
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+ * regulator descriptor's volt_table)
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+ *
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+ * Return: 0 on success or appropriate error value when fails
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+ */
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+static int ti_abb_set_voltage_sel(struct regulator_dev *rdev, unsigned sel)
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+{
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+ const struct regulator_desc *desc = rdev->desc;
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+ struct ti_abb *abb = rdev_get_drvdata(rdev);
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+ struct device *dev = &rdev->dev;
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+ struct ti_abb_info *info, *oinfo;
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+ int ret = 0;
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+
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+ if (!abb) {
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+ dev_err_ratelimited(dev, "%s: No regulator drvdata\n",
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+ __func__);
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+ return -ENODEV;
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+ }
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+
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+ if (!desc->n_voltages || !abb->info) {
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+ dev_err_ratelimited(dev,
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+ "%s: No valid voltage table entries?\n",
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+ __func__);
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+ return -EINVAL;
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+ }
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+
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+ if (sel >= desc->n_voltages) {
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+ dev_err(dev, "%s: sel idx(%d) >= n_voltages(%d)\n", __func__,
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+ sel, desc->n_voltages);
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+ return -EINVAL;
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+ }
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+
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+ /* If we are in the same index as we were, nothing to do here! */
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+ if (sel == abb->current_info_idx) {
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+ dev_dbg(dev, "%s: Already at sel=%d\n", __func__, sel);
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+ return ret;
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+ }
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+
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+ /* If data is exactly the same, then just update index, no change */
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+ info = &abb->info[sel];
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+ oinfo = &abb->info[abb->current_info_idx];
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+ if (!memcmp(info, oinfo, sizeof(*info))) {
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+ dev_dbg(dev, "%s: Same data new idx=%d, old idx=%d\n", __func__,
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+ sel, abb->current_info_idx);
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+ goto out;
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+ }
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+
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+ ret = ti_abb_set_opp(rdev, abb, info);
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+
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+out:
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+ if (!ret)
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+ abb->current_info_idx = sel;
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+ else
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+ dev_err_ratelimited(dev,
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+ "%s: Volt[%d] idx[%d] mode[%d] Fail(%d)\n",
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+ __func__, desc->volt_table[sel], sel,
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+ info->opp_sel, ret);
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+ return ret;
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+}
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+
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+/**
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+ * ti_abb_get_voltage_sel() - Regulator accessor to get current ABB LDO setting
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+ * @rdev: regulator device
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+ *
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+ * Return: 0 on success or appropriate error value when fails
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+ */
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+static int ti_abb_get_voltage_sel(struct regulator_dev *rdev)
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+{
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+ const struct regulator_desc *desc = rdev->desc;
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+ struct ti_abb *abb = rdev_get_drvdata(rdev);
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+ struct device *dev = &rdev->dev;
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+
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+ if (!abb) {
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+ dev_err_ratelimited(dev, "%s: No regulator drvdata\n",
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+ __func__);
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+ return -ENODEV;
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+ }
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+
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+ if (!desc->n_voltages || !abb->info) {
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+ dev_err_ratelimited(dev,
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+ "%s: No valid voltage table entries?\n",
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+ __func__);
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+ return -EINVAL;
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+ }
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+
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+ if (abb->current_info_idx >= (int)desc->n_voltages) {
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+ dev_err(dev, "%s: Corrupted data? idx(%d) >= n_voltages(%d)\n",
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+ __func__, abb->current_info_idx, desc->n_voltages);
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+ return -EINVAL;
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+ }
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+
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+ return abb->current_info_idx;
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+}
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+
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+/**
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+ * ti_abb_init_timings() - setup ABB clock timing for the current platform
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+ * @dev: device
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+ * @abb: pointer to the abb instance
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+ *
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|
|
+ * Return: 0 if timing is updated, else returns error result.
|
|
|
+ */
|
|
|
+static int ti_abb_init_timings(struct device *dev, struct ti_abb *abb)
|
|
|
+{
|
|
|
+ u32 clock_cycles;
|
|
|
+ u32 clk_rate, sr2_wt_cnt_val, cycle_rate;
|
|
|
+ const struct ti_abb_reg *regs = abb->regs;
|
|
|
+ int ret;
|
|
|
+ char *pname = "ti,settling-time";
|
|
|
+
|
|
|
+ /* read device tree properties */
|
|
|
+ ret = of_property_read_u32(dev->of_node, pname, &abb->settling_time);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* ABB LDO cannot be settle in 0 time */
|
|
|
+ if (!abb->settling_time) {
|
|
|
+ dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ pname = "ti,clock-cycles";
|
|
|
+ ret = of_property_read_u32(dev->of_node, pname, &clock_cycles);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+ /* ABB LDO cannot be settle in 0 clock cycles */
|
|
|
+ if (!clock_cycles) {
|
|
|
+ dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ abb->clk = devm_clk_get(dev, NULL);
|
|
|
+ if (IS_ERR(abb->clk)) {
|
|
|
+ ret = PTR_ERR(abb->clk);
|
|
|
+ dev_err(dev, "%s: Unable to get clk(%d)\n", __func__, ret);
|
|
|
+ return ret;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * SR2_WTCNT_VALUE is the settling time for the ABB ldo after a
|
|
|
+ * transition and must be programmed with the correct time at boot.
|
|
|
+ * The value programmed into the register is the number of SYS_CLK
|
|
|
+ * clock cycles that match a given wall time profiled for the ldo.
|
|
|
+ * This value depends on:
|
|
|
+ * settling time of ldo in micro-seconds (varies per OMAP family)
|
|
|
+ * # of clock cycles per SYS_CLK period (varies per OMAP family)
|
|
|
+ * the SYS_CLK frequency in MHz (varies per board)
|
|
|
+ * The formula is:
|
|
|
+ *
|
|
|
+ * ldo settling time (in micro-seconds)
|
|
|
+ * SR2_WTCNT_VALUE = ------------------------------------------
|
|
|
+ * (# system clock cycles) * (sys_clk period)
|
|
|
+ *
|
|
|
+ * Put another way:
|
|
|
+ *
|
|
|
+ * SR2_WTCNT_VALUE = settling time / (# SYS_CLK cycles / SYS_CLK rate))
|
|
|
+ *
|
|
|
+ * To avoid dividing by zero multiply both "# clock cycles" and
|
|
|
+ * "settling time" by 10 such that the final result is the one we want.
|
|
|
+ */
|
|
|
+
|
|
|
+ /* Convert SYS_CLK rate to MHz & prevent divide by zero */
|
|
|
+ clk_rate = DIV_ROUND_CLOSEST(clk_get_rate(abb->clk), 1000000);
|
|
|
+
|
|
|
+ /* Calculate cycle rate */
|
|
|
+ cycle_rate = DIV_ROUND_CLOSEST(clock_cycles * 10, clk_rate);
|
|
|
+
|
|
|
+ /* Calulate SR2_WTCNT_VALUE */
|
|
|
+ sr2_wt_cnt_val = DIV_ROUND_CLOSEST(abb->settling_time * 10, cycle_rate);
|
|
|
+
|
|
|
+ dev_dbg(dev, "%s: Clk_rate=%ld, sr2_cnt=0x%08x\n", __func__,
|
|
|
+ clk_get_rate(abb->clk), sr2_wt_cnt_val);
|
|
|
+
|
|
|
+ ti_abb_rmw(regs->sr2_wtcnt_value_mask, sr2_wt_cnt_val, regs->setup_reg,
|
|
|
+ abb->base);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * ti_abb_init_table() - Initialize ABB table from device tree
|
|
|
+ * @dev: device
|
|
|
+ * @abb: pointer to the abb instance
|
|
|
+ * @rinit_data: regulator initdata
|
|
|
+ *
|
|
|
+ * Return: 0 on success or appropriate error value when fails
|
|
|
+ */
|
|
|
+static int ti_abb_init_table(struct device *dev, struct ti_abb *abb,
|
|
|
+ struct regulator_init_data *rinit_data)
|
|
|
+{
|
|
|
+ struct ti_abb_info *info;
|
|
|
+ const struct property *prop;
|
|
|
+ const __be32 *abb_info;
|
|
|
+ const u32 num_values = 6;
|
|
|
+ char *pname = "ti,abb_info";
|
|
|
+ u32 num_entries, i;
|
|
|
+ unsigned int *volt_table;
|
|
|
+ int min_uV = INT_MAX, max_uV = 0;
|
|
|
+ struct regulation_constraints *c = &rinit_data->constraints;
|
|
|
+
|
|
|
+ prop = of_find_property(dev->of_node, pname, NULL);
|
|
|
+ if (!prop) {
|
|
|
+ dev_err(dev, "No '%s' property?\n", pname);
|
|
|
+ return -ENODEV;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!prop->value) {
|
|
|
+ dev_err(dev, "Empty '%s' property?\n", pname);
|
|
|
+ return -ENODATA;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Each abb_info is a set of n-tuple, where n is num_values, consisting
|
|
|
+ * of voltage and a set of detection logic for ABB information for that
|
|
|
+ * voltage to apply.
|
|
|
+ */
|
|
|
+ num_entries = prop->length / sizeof(u32);
|
|
|
+ if (!num_entries || (num_entries % num_values)) {
|
|
|
+ dev_err(dev, "All '%s' list entries need %d vals\n", pname,
|
|
|
+ num_values);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+ num_entries /= num_values;
|
|
|
+
|
|
|
+ info = devm_kzalloc(dev, sizeof(*info) * num_entries, GFP_KERNEL);
|
|
|
+ if (!info) {
|
|
|
+ dev_err(dev, "Can't allocate info table for '%s' property\n",
|
|
|
+ pname);
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+ abb->info = info;
|
|
|
+
|
|
|
+ volt_table = devm_kzalloc(dev, sizeof(unsigned int) * num_entries,
|
|
|
+ GFP_KERNEL);
|
|
|
+ if (!volt_table) {
|
|
|
+ dev_err(dev, "Can't allocate voltage table for '%s' property\n",
|
|
|
+ pname);
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+
|
|
|
+ abb->rdesc.n_voltages = num_entries;
|
|
|
+ abb->rdesc.volt_table = volt_table;
|
|
|
+ /* We do not know where the OPP voltage is at the moment */
|
|
|
+ abb->current_info_idx = -EINVAL;
|
|
|
+
|
|
|
+ abb_info = prop->value;
|
|
|
+ for (i = 0; i < num_entries; i++, info++, volt_table++) {
|
|
|
+ u32 efuse_offset, rbb_mask, fbb_mask, vset_mask;
|
|
|
+ u32 efuse_val;
|
|
|
+
|
|
|
+ /* NOTE: num_values should equal to entries picked up here */
|
|
|
+ *volt_table = be32_to_cpup(abb_info++);
|
|
|
+ info->opp_sel = be32_to_cpup(abb_info++);
|
|
|
+ efuse_offset = be32_to_cpup(abb_info++);
|
|
|
+ rbb_mask = be32_to_cpup(abb_info++);
|
|
|
+ fbb_mask = be32_to_cpup(abb_info++);
|
|
|
+ vset_mask = be32_to_cpup(abb_info++);
|
|
|
+
|
|
|
+ dev_dbg(dev,
|
|
|
+ "[%d]v=%d ABB=%d ef=0x%x rbb=0x%x fbb=0x%x vset=0x%x\n",
|
|
|
+ i, *volt_table, info->opp_sel, efuse_offset, rbb_mask,
|
|
|
+ fbb_mask, vset_mask);
|
|
|
+
|
|
|
+ /* Find min/max for voltage set */
|
|
|
+ if (min_uV > *volt_table)
|
|
|
+ min_uV = *volt_table;
|
|
|
+ if (max_uV < *volt_table)
|
|
|
+ max_uV = *volt_table;
|
|
|
+
|
|
|
+ if (!abb->efuse_base) {
|
|
|
+ /* Ignore invalid data, but warn to help cleanup */
|
|
|
+ if (efuse_offset || rbb_mask || fbb_mask || vset_mask)
|
|
|
+ dev_err(dev, "prop '%s': v=%d,bad efuse/mask\n",
|
|
|
+ pname, *volt_table);
|
|
|
+ goto check_abb;
|
|
|
+ }
|
|
|
+
|
|
|
+ efuse_val = readl(abb->efuse_base + efuse_offset);
|
|
|
+
|
|
|
+ /* Use ABB recommendation from Efuse */
|
|
|
+ if (efuse_val & rbb_mask)
|
|
|
+ info->opp_sel = TI_ABB_SLOW_OPP;
|
|
|
+ else if (efuse_val & fbb_mask)
|
|
|
+ info->opp_sel = TI_ABB_FAST_OPP;
|
|
|
+ else if (rbb_mask || fbb_mask)
|
|
|
+ info->opp_sel = TI_ABB_NOMINAL_OPP;
|
|
|
+
|
|
|
+ dev_dbg(dev,
|
|
|
+ "[%d]v=%d efusev=0x%x final ABB=%d\n",
|
|
|
+ i, *volt_table, efuse_val, info->opp_sel);
|
|
|
+
|
|
|
+ /* Use recommended Vset bits from Efuse */
|
|
|
+ if (!abb->ldo_base) {
|
|
|
+ if (vset_mask)
|
|
|
+ dev_err(dev, "prop'%s':v=%d vst=%x LDO base?\n",
|
|
|
+ pname, *volt_table, vset_mask);
|
|
|
+ continue;
|
|
|
+ }
|
|
|
+ info->vset = efuse_val & vset_mask >> __ffs(vset_mask);
|
|
|
+ dev_dbg(dev, "[%d]v=%d vset=%x\n", i, *volt_table, info->vset);
|
|
|
+check_abb:
|
|
|
+ switch (info->opp_sel) {
|
|
|
+ case TI_ABB_NOMINAL_OPP:
|
|
|
+ case TI_ABB_FAST_OPP:
|
|
|
+ case TI_ABB_SLOW_OPP:
|
|
|
+ /* Valid values */
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ dev_err(dev, "%s:[%d]v=%d, ABB=%d is invalid! Abort!\n",
|
|
|
+ __func__, i, *volt_table, info->opp_sel);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Setup the min/max voltage constraints from the supported list */
|
|
|
+ c->min_uV = min_uV;
|
|
|
+ c->max_uV = max_uV;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static struct regulator_ops ti_abb_reg_ops = {
|
|
|
+ .list_voltage = regulator_list_voltage_table,
|
|
|
+
|
|
|
+ .set_voltage_sel = ti_abb_set_voltage_sel,
|
|
|
+ .get_voltage_sel = ti_abb_get_voltage_sel,
|
|
|
+};
|
|
|
+
|
|
|
+/* Default ABB block offsets, IF this changes in future, create new one */
|
|
|
+static const struct ti_abb_reg abb_regs_v1 = {
|
|
|
+ /* WARNING: registers are wrongly documented in TRM */
|
|
|
+ .setup_reg = 0x04,
|
|
|
+ .control_reg = 0x00,
|
|
|
+
|
|
|
+ .sr2_wtcnt_value_mask = (0xff << 8),
|
|
|
+ .fbb_sel_mask = (0x01 << 2),
|
|
|
+ .rbb_sel_mask = (0x01 << 1),
|
|
|
+ .sr2_en_mask = (0x01 << 0),
|
|
|
+
|
|
|
+ .opp_change_mask = (0x01 << 2),
|
|
|
+ .opp_sel_mask = (0x03 << 0),
|
|
|
+};
|
|
|
+
|
|
|
+static const struct ti_abb_reg abb_regs_v2 = {
|
|
|
+ .setup_reg = 0x00,
|
|
|
+ .control_reg = 0x04,
|
|
|
+
|
|
|
+ .sr2_wtcnt_value_mask = (0xff << 8),
|
|
|
+ .fbb_sel_mask = (0x01 << 2),
|
|
|
+ .rbb_sel_mask = (0x01 << 1),
|
|
|
+ .sr2_en_mask = (0x01 << 0),
|
|
|
+
|
|
|
+ .opp_change_mask = (0x01 << 2),
|
|
|
+ .opp_sel_mask = (0x03 << 0),
|
|
|
+};
|
|
|
+
|
|
|
+static const struct of_device_id ti_abb_of_match[] = {
|
|
|
+ {.compatible = "ti,abb-v1", .data = &abb_regs_v1},
|
|
|
+ {.compatible = "ti,abb-v2", .data = &abb_regs_v2},
|
|
|
+ { },
|
|
|
+};
|
|
|
+
|
|
|
+MODULE_DEVICE_TABLE(of, ti_abb_of_match);
|
|
|
+
|
|
|
+/**
|
|
|
+ * ti_abb_probe() - Initialize an ABB ldo instance
|
|
|
+ * @pdev: ABB platform device
|
|
|
+ *
|
|
|
+ * Initializes an individual ABB LDO for required Body-Bias. ABB is used to
|
|
|
+ * addional bias supply to SoC modules for power savings or mandatory stability
|
|
|
+ * configuration at certain Operating Performance Points(OPPs).
|
|
|
+ *
|
|
|
+ * Return: 0 on success or appropriate error value when fails
|
|
|
+ */
|
|
|
+static int ti_abb_probe(struct platform_device *pdev)
|
|
|
+{
|
|
|
+ struct device *dev = &pdev->dev;
|
|
|
+ const struct of_device_id *match;
|
|
|
+ struct resource *res;
|
|
|
+ struct ti_abb *abb;
|
|
|
+ struct regulator_init_data *initdata = NULL;
|
|
|
+ struct regulator_dev *rdev = NULL;
|
|
|
+ struct regulator_desc *desc;
|
|
|
+ struct regulation_constraints *c;
|
|
|
+ struct regulator_config config = { };
|
|
|
+ char *pname;
|
|
|
+ int ret = 0;
|
|
|
+
|
|
|
+ match = of_match_device(ti_abb_of_match, dev);
|
|
|
+ if (!match) {
|
|
|
+ /* We do not expect this to happen */
|
|
|
+ ret = -ENODEV;
|
|
|
+ dev_err(dev, "%s: Unable to match device\n", __func__);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ if (!match->data) {
|
|
|
+ ret = -EINVAL;
|
|
|
+ dev_err(dev, "%s: Bad data in match\n", __func__);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ abb = devm_kzalloc(dev, sizeof(struct ti_abb), GFP_KERNEL);
|
|
|
+ if (!abb) {
|
|
|
+ dev_err(dev, "%s: Unable to allocate ABB struct\n", __func__);
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ abb->regs = match->data;
|
|
|
+
|
|
|
+ /* Map ABB resources */
|
|
|
+ pname = "base-address";
|
|
|
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);
|
|
|
+ if (!res) {
|
|
|
+ dev_err(dev, "Missing '%s' IO resource\n", pname);
|
|
|
+ ret = -ENODEV;
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ abb->base = devm_ioremap_resource(dev, res);
|
|
|
+ if (IS_ERR(abb->base)) {
|
|
|
+ ret = PTR_ERR(abb->base);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ pname = "int-address";
|
|
|
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);
|
|
|
+ if (!res) {
|
|
|
+ dev_err(dev, "Missing '%s' IO resource\n", pname);
|
|
|
+ ret = -ENODEV;
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * We may have shared interrupt register offsets which are
|
|
|
+ * write-1-to-clear between domains ensuring exclusivity.
|
|
|
+ */
|
|
|
+ abb->int_base = devm_ioremap_nocache(dev, res->start,
|
|
|
+ resource_size(res));
|
|
|
+ if (!abb->int_base) {
|
|
|
+ dev_err(dev, "Unable to map '%s'\n", pname);
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* Map Optional resources */
|
|
|
+ pname = "efuse-address";
|
|
|
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);
|
|
|
+ if (!res) {
|
|
|
+ dev_dbg(dev, "Missing '%s' IO resource\n", pname);
|
|
|
+ ret = -ENODEV;
|
|
|
+ goto skip_opt;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * We may have shared efuse register offsets which are read-only
|
|
|
+ * between domains
|
|
|
+ */
|
|
|
+ abb->efuse_base = devm_ioremap_nocache(dev, res->start,
|
|
|
+ resource_size(res));
|
|
|
+ if (!abb->efuse_base) {
|
|
|
+ dev_err(dev, "Unable to map '%s'\n", pname);
|
|
|
+ ret = -ENOMEM;
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ pname = "ldo-address";
|
|
|
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);
|
|
|
+ if (!res) {
|
|
|
+ dev_dbg(dev, "Missing '%s' IO resource\n", pname);
|
|
|
+ ret = -ENODEV;
|
|
|
+ goto skip_opt;
|
|
|
+ }
|
|
|
+ abb->ldo_base = devm_ioremap_resource(dev, res);
|
|
|
+ if (IS_ERR(abb->ldo_base)) {
|
|
|
+ ret = PTR_ERR(abb->ldo_base);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* IF ldo_base is set, the following are mandatory */
|
|
|
+ pname = "ti,ldovbb-override-mask";
|
|
|
+ ret =
|
|
|
+ of_property_read_u32(pdev->dev.of_node, pname,
|
|
|
+ &abb->ldovbb_override_mask);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(dev, "Missing '%s' (%d)\n", pname, ret);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ if (!abb->ldovbb_override_mask) {
|
|
|
+ dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
|
|
|
+ ret = -EINVAL;
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ pname = "ti,ldovbb-vset-mask";
|
|
|
+ ret =
|
|
|
+ of_property_read_u32(pdev->dev.of_node, pname,
|
|
|
+ &abb->ldovbb_vset_mask);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(dev, "Missing '%s' (%d)\n", pname, ret);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ if (!abb->ldovbb_vset_mask) {
|
|
|
+ dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
|
|
|
+ ret = -EINVAL;
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+skip_opt:
|
|
|
+ pname = "ti,tranxdone-status-mask";
|
|
|
+ ret =
|
|
|
+ of_property_read_u32(pdev->dev.of_node, pname,
|
|
|
+ &abb->txdone_mask);
|
|
|
+ if (ret) {
|
|
|
+ dev_err(dev, "Missing '%s' (%d)\n", pname, ret);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ if (!abb->txdone_mask) {
|
|
|
+ dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
|
|
|
+ ret = -EINVAL;
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ initdata = of_get_regulator_init_data(dev, pdev->dev.of_node);
|
|
|
+ if (!initdata) {
|
|
|
+ ret = -ENOMEM;
|
|
|
+ dev_err(dev, "%s: Unable to alloc regulator init data\n",
|
|
|
+ __func__);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* init ABB opp_sel table */
|
|
|
+ ret = ti_abb_init_table(dev, abb, initdata);
|
|
|
+ if (ret)
|
|
|
+ goto err;
|
|
|
+
|
|
|
+ /* init ABB timing */
|
|
|
+ ret = ti_abb_init_timings(dev, abb);
|
|
|
+ if (ret)
|
|
|
+ goto err;
|
|
|
+
|
|
|
+ desc = &abb->rdesc;
|
|
|
+ desc->name = dev_name(dev);
|
|
|
+ desc->owner = THIS_MODULE;
|
|
|
+ desc->type = REGULATOR_VOLTAGE;
|
|
|
+ desc->ops = &ti_abb_reg_ops;
|
|
|
+
|
|
|
+ c = &initdata->constraints;
|
|
|
+ if (desc->n_voltages > 1)
|
|
|
+ c->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
|
|
|
+ c->always_on = true;
|
|
|
+
|
|
|
+ config.dev = dev;
|
|
|
+ config.init_data = initdata;
|
|
|
+ config.driver_data = abb;
|
|
|
+ config.of_node = pdev->dev.of_node;
|
|
|
+
|
|
|
+ rdev = regulator_register(desc, &config);
|
|
|
+ if (IS_ERR(rdev)) {
|
|
|
+ ret = PTR_ERR(rdev);
|
|
|
+ dev_err(dev, "%s: failed to register regulator(%d)\n",
|
|
|
+ __func__, ret);
|
|
|
+ goto err;
|
|
|
+ }
|
|
|
+ platform_set_drvdata(pdev, rdev);
|
|
|
+
|
|
|
+ /* Enable the ldo if not already done by bootloader */
|
|
|
+ ti_abb_rmw(abb->regs->sr2_en_mask, 1, abb->regs->setup_reg, abb->base);
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+err:
|
|
|
+ dev_err(dev, "%s: Failed to initialize(%d)\n", __func__, ret);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * ti_abb_remove() - cleanups
|
|
|
+ * @pdev: ABB platform device
|
|
|
+ *
|
|
|
+ * Return: 0
|
|
|
+ */
|
|
|
+static int ti_abb_remove(struct platform_device *pdev)
|
|
|
+{
|
|
|
+ struct regulator_dev *rdev = platform_get_drvdata(pdev);
|
|
|
+
|
|
|
+ regulator_unregister(rdev);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+MODULE_ALIAS("platform:ti_abb");
|
|
|
+
|
|
|
+static struct platform_driver ti_abb_driver = {
|
|
|
+ .probe = ti_abb_probe,
|
|
|
+ .remove = ti_abb_remove,
|
|
|
+ .driver = {
|
|
|
+ .name = "ti_abb",
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+ .of_match_table = of_match_ptr(ti_abb_of_match),
|
|
|
+ },
|
|
|
+};
|
|
|
+module_platform_driver(ti_abb_driver);
|
|
|
+
|
|
|
+MODULE_DESCRIPTION("Texas Instruments ABB LDO regulator driver");
|
|
|
+MODULE_AUTHOR("Texas Instruments Inc.");
|
|
|
+MODULE_LICENSE("GPL v2");
|
Mark Brown