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902 lines
24 KiB
902 lines
24 KiB
/* |
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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 <[email protected]> |
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* |
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* Copyright (C) 2012-2013 Texas Instruments, Inc. |
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* Andrii Tseglytskyi <[email protected]> |
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* Nishanth Menon <[email protected]> |
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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_off: setup register offset from base |
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* @control_off: 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_off; |
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u32 control_off; |
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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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* @setup_reg: setup register of ABB block |
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* @control_reg: control register 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 *setup_reg; |
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void __iomem *control_reg; |
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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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* @reg: register 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, void __iomem *reg) |
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{ |
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u32 val; |
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|
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val = readl(reg); |
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val &= ~mask; |
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val |= (value << __ffs(mask)) & mask; |
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writel(val, reg); |
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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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return 0; |
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|
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udelay(1); |
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} |
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|
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dev_warn_ratelimited(dev, "%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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/** |
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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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return 0; |
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|
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udelay(1); |
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} |
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dev_warn_ratelimited(dev, "%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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/** |
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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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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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ret = ti_abb_clear_all_txdone(dev, abb); |
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if (ret) |
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goto out; |
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ti_abb_rmw(regs->fbb_sel_mask | regs->rbb_sel_mask, 0, abb->setup_reg); |
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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, abb->setup_reg); |
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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, abb->setup_reg); |
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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, abb->control_reg); |
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|
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/* |
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* program LDO VBB vset override if needed for !bypass mode |
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* XXX: Do not switch sequence - for !bypass, LDO override reset *must* |
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* be performed *before* switch to bias mode else VBB glitches. |
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*/ |
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if (abb->ldo_base && info->opp_sel != TI_ABB_NOMINAL_OPP) |
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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, abb->control_reg); |
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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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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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* Reset LDO VBB vset override bypass mode |
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* XXX: Do not switch sequence - for bypass, LDO override reset *must* |
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* be performed *after* switch to bypass else VBB glitches. |
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*/ |
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if (abb->ldo_base && info->opp_sel == TI_ABB_NOMINAL_OPP) |
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ti_abb_program_ldovbb(dev, abb, info); |
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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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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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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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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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info = &abb->info[sel]; |
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/* |
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* When Linux kernel is starting up, we are'nt sure of the |
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* Bias configuration that bootloader has configured. |
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* So, we get to know the actual setting the first time |
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* we are asked to transition. |
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*/ |
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if (abb->current_info_idx == -EINVAL) |
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goto just_set_abb; |
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|
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/* If data is exactly the same, then just update index, no change */ |
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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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just_set_abb: |
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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. |
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*/ |
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static int ti_abb_init_timings(struct device *dev, struct ti_abb *abb) |
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{ |
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u32 clock_cycles; |
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u32 clk_rate, sr2_wt_cnt_val, cycle_rate; |
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const struct ti_abb_reg *regs = abb->regs; |
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int ret; |
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char *pname = "ti,settling-time"; |
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|
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/* read device tree properties */ |
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ret = of_property_read_u32(dev->of_node, pname, &abb->settling_time); |
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if (ret) { |
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dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret); |
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return ret; |
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} |
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|
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/* ABB LDO cannot be settle in 0 time */ |
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if (!abb->settling_time) { |
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dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); |
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return -EINVAL; |
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} |
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|
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pname = "ti,clock-cycles"; |
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ret = of_property_read_u32(dev->of_node, pname, &clock_cycles); |
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if (ret) { |
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dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret); |
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return ret; |
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} |
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/* ABB LDO cannot be settle in 0 clock cycles */ |
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if (!clock_cycles) { |
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dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); |
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return -EINVAL; |
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} |
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|
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abb->clk = devm_clk_get(dev, NULL); |
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if (IS_ERR(abb->clk)) { |
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ret = PTR_ERR(abb->clk); |
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dev_err(dev, "%s: Unable to get clk(%d)\n", __func__, ret); |
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return ret; |
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} |
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|
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/* |
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* SR2_WTCNT_VALUE is the settling time for the ABB ldo after a |
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* transition and must be programmed with the correct time at boot. |
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* The value programmed into the register is the number of SYS_CLK |
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* clock cycles that match a given wall time profiled for the ldo. |
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* This value depends on: |
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* settling time of ldo in micro-seconds (varies per OMAP family) |
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* # of clock cycles per SYS_CLK period (varies per OMAP family) |
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* the SYS_CLK frequency in MHz (varies per board) |
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* The formula is: |
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* |
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* ldo settling time (in micro-seconds) |
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* SR2_WTCNT_VALUE = ------------------------------------------ |
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* (# system clock cycles) * (sys_clk period) |
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* |
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* Put another way: |
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* |
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* SR2_WTCNT_VALUE = settling time / (# SYS_CLK cycles / SYS_CLK rate)) |
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* |
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* To avoid dividing by zero multiply both "# clock cycles" and |
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* "settling time" by 10 such that the final result is the one we want. |
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*/ |
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|
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/* Convert SYS_CLK rate to MHz & prevent divide by zero */ |
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clk_rate = DIV_ROUND_CLOSEST(clk_get_rate(abb->clk), 1000000); |
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|
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/* Calculate cycle rate */ |
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cycle_rate = DIV_ROUND_CLOSEST(clock_cycles * 10, clk_rate); |
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|
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/* Calulate SR2_WTCNT_VALUE */ |
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sr2_wt_cnt_val = DIV_ROUND_CLOSEST(abb->settling_time * 10, cycle_rate); |
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|
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dev_dbg(dev, "%s: Clk_rate=%ld, sr2_cnt=0x%08x\n", __func__, |
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clk_get_rate(abb->clk), sr2_wt_cnt_val); |
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|
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ti_abb_rmw(regs->sr2_wtcnt_value_mask, sr2_wt_cnt_val, abb->setup_reg); |
|
|
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return 0; |
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} |
|
|
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/** |
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* ti_abb_init_table() - Initialize ABB table from device tree |
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* @dev: device |
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* @abb: pointer to the abb instance |
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* @rinit_data: regulator initdata |
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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_init_table(struct device *dev, struct ti_abb *abb, |
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struct regulator_init_data *rinit_data) |
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{ |
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struct ti_abb_info *info; |
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const u32 num_values = 6; |
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char *pname = "ti,abb_info"; |
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u32 i; |
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unsigned int *volt_table; |
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int num_entries, min_uV = INT_MAX, max_uV = 0; |
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struct regulation_constraints *c = &rinit_data->constraints; |
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|
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/* |
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* Each abb_info is a set of n-tuple, where n is num_values, consisting |
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* of voltage and a set of detection logic for ABB information for that |
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* voltage to apply. |
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*/ |
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num_entries = of_property_count_u32_elems(dev->of_node, pname); |
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if (num_entries < 0) { |
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dev_err(dev, "No '%s' property?\n", pname); |
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return num_entries; |
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} |
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|
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if (!num_entries || (num_entries % num_values)) { |
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dev_err(dev, "All '%s' list entries need %d vals\n", pname, |
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num_values); |
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return -EINVAL; |
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} |
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num_entries /= num_values; |
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|
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info = devm_kcalloc(dev, num_entries, sizeof(*info), GFP_KERNEL); |
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if (!info) |
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return -ENOMEM; |
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|
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abb->info = info; |
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|
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volt_table = devm_kcalloc(dev, num_entries, sizeof(unsigned int), |
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GFP_KERNEL); |
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if (!volt_table) |
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return -ENOMEM; |
|
|
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abb->rdesc.n_voltages = num_entries; |
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abb->rdesc.volt_table = volt_table; |
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/* We do not know where the OPP voltage is at the moment */ |
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abb->current_info_idx = -EINVAL; |
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|
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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 */ |
|
of_property_read_u32_index(dev->of_node, pname, i * num_values, |
|
volt_table); |
|
of_property_read_u32_index(dev->of_node, pname, |
|
i * num_values + 1, &info->opp_sel); |
|
of_property_read_u32_index(dev->of_node, pname, |
|
i * num_values + 2, &efuse_offset); |
|
of_property_read_u32_index(dev->of_node, pname, |
|
i * num_values + 3, &rbb_mask); |
|
of_property_read_u32_index(dev->of_node, pname, |
|
i * num_values + 4, &fbb_mask); |
|
of_property_read_u32_index(dev->of_node, pname, |
|
i * num_values + 5, &vset_mask); |
|
|
|
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 const 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_off = 0x04, |
|
.control_off = 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_off = 0x00, |
|
.control_off = 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 ti_abb_reg abb_regs_generic = { |
|
.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}, |
|
{.compatible = "ti,abb-v3", .data = &abb_regs_generic}, |
|
{ }, |
|
}; |
|
|
|
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 */ |
|
dev_err(dev, "%s: Unable to match device\n", __func__); |
|
return -ENODEV; |
|
} |
|
if (!match->data) { |
|
dev_err(dev, "%s: Bad data in match\n", __func__); |
|
return -EINVAL; |
|
} |
|
|
|
abb = devm_kzalloc(dev, sizeof(struct ti_abb), GFP_KERNEL); |
|
if (!abb) |
|
return -ENOMEM; |
|
abb->regs = match->data; |
|
|
|
/* Map ABB resources */ |
|
if (abb->regs->setup_off || abb->regs->control_off) { |
|
pname = "base-address"; |
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname); |
|
abb->base = devm_ioremap_resource(dev, res); |
|
if (IS_ERR(abb->base)) |
|
return PTR_ERR(abb->base); |
|
|
|
abb->setup_reg = abb->base + abb->regs->setup_off; |
|
abb->control_reg = abb->base + abb->regs->control_off; |
|
|
|
} else { |
|
pname = "control-address"; |
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname); |
|
abb->control_reg = devm_ioremap_resource(dev, res); |
|
if (IS_ERR(abb->control_reg)) |
|
return PTR_ERR(abb->control_reg); |
|
|
|
pname = "setup-address"; |
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname); |
|
abb->setup_reg = devm_ioremap_resource(dev, res); |
|
if (IS_ERR(abb->setup_reg)) |
|
return PTR_ERR(abb->setup_reg); |
|
} |
|
|
|
pname = "int-address"; |
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname); |
|
if (!res) { |
|
dev_err(dev, "Missing '%s' IO resource\n", pname); |
|
return -ENODEV; |
|
} |
|
/* |
|
* We may have shared interrupt register offsets which are |
|
* write-1-to-clear between domains ensuring exclusivity. |
|
*/ |
|
abb->int_base = devm_ioremap(dev, res->start, |
|
resource_size(res)); |
|
if (!abb->int_base) { |
|
dev_err(dev, "Unable to map '%s'\n", pname); |
|
return -ENOMEM; |
|
} |
|
|
|
/* 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(dev, res->start, |
|
resource_size(res)); |
|
if (!abb->efuse_base) { |
|
dev_err(dev, "Unable to map '%s'\n", pname); |
|
return -ENOMEM; |
|
} |
|
|
|
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)) |
|
return PTR_ERR(abb->ldo_base); |
|
|
|
/* 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); |
|
return ret; |
|
} |
|
if (!abb->ldovbb_override_mask) { |
|
dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); |
|
return -EINVAL; |
|
} |
|
|
|
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); |
|
return ret; |
|
} |
|
if (!abb->ldovbb_vset_mask) { |
|
dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); |
|
return -EINVAL; |
|
} |
|
|
|
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); |
|
return ret; |
|
} |
|
if (!abb->txdone_mask) { |
|
dev_err(dev, "Invalid property:'%s' set as 0!\n", pname); |
|
return -EINVAL; |
|
} |
|
|
|
initdata = of_get_regulator_init_data(dev, pdev->dev.of_node, |
|
&abb->rdesc); |
|
if (!initdata) { |
|
dev_err(dev, "%s: Unable to alloc regulator init data\n", |
|
__func__); |
|
return -ENOMEM; |
|
} |
|
|
|
/* init ABB opp_sel table */ |
|
ret = ti_abb_init_table(dev, abb, initdata); |
|
if (ret) |
|
return ret; |
|
|
|
/* init ABB timing */ |
|
ret = ti_abb_init_timings(dev, abb); |
|
if (ret) |
|
return ret; |
|
|
|
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 = devm_regulator_register(dev, desc, &config); |
|
if (IS_ERR(rdev)) { |
|
ret = PTR_ERR(rdev); |
|
dev_err(dev, "%s: failed to register regulator(%d)\n", |
|
__func__, ret); |
|
return ret; |
|
} |
|
platform_set_drvdata(pdev, rdev); |
|
|
|
/* Enable the ldo if not already done by bootloader */ |
|
ti_abb_rmw(abb->regs->sr2_en_mask, 1, abb->setup_reg); |
|
|
|
return 0; |
|
} |
|
|
|
MODULE_ALIAS("platform:ti_abb"); |
|
|
|
static struct platform_driver ti_abb_driver = { |
|
.probe = ti_abb_probe, |
|
.driver = { |
|
.name = "ti_abb", |
|
.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");
|
|
|