linux/drivers/regulator/ti-abb-regulator.c
Linus Torvalds e6b5be2be4 Driver core patches for 3.19-rc1
Here's the set of driver core patches for 3.19-rc1.
 
 They are dominated by the removal of the .owner field in platform
 drivers.  They touch a lot of files, but they are "simple" changes, just
 removing a line in a structure.
 
 Other than that, a few minor driver core and debugfs changes.  There are
 some ath9k patches coming in through this tree that have been acked by
 the wireless maintainers as they relied on the debugfs changes.
 
 Everything has been in linux-next for a while.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here's the set of driver core patches for 3.19-rc1.

  They are dominated by the removal of the .owner field in platform
  drivers.  They touch a lot of files, but they are "simple" changes,
  just removing a line in a structure.

  Other than that, a few minor driver core and debugfs changes.  There
  are some ath9k patches coming in through this tree that have been
  acked by the wireless maintainers as they relied on the debugfs
  changes.

  Everything has been in linux-next for a while"

* tag 'driver-core-3.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (324 commits)
  Revert "ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries"
  fs: debugfs: add forward declaration for struct device type
  firmware class: Deletion of an unnecessary check before the function call "vunmap"
  firmware loader: fix hung task warning dump
  devcoredump: provide a one-way disable function
  device: Add dev_<level>_once variants
  ath: ath9k: use debugfs_create_devm_seqfile() helper for seq_file entries
  ath: use seq_file api for ath9k debugfs files
  debugfs: add helper function to create device related seq_file
  drivers/base: cacheinfo: remove noisy error boot message
  Revert "core: platform: add warning if driver has no owner"
  drivers: base: support cpu cache information interface to userspace via sysfs
  drivers: base: add cpu_device_create to support per-cpu devices
  topology: replace custom attribute macros with standard DEVICE_ATTR*
  cpumask: factor out show_cpumap into separate helper function
  driver core: Fix unbalanced device reference in drivers_probe
  driver core: fix race with userland in device_add()
  sysfs/kernfs: make read requests on pre-alloc files use the buffer.
  sysfs/kernfs: allow attributes to request write buffer be pre-allocated.
  fs: sysfs: return EGBIG on write if offset is larger than file size
  ...
2014-12-14 16:10:09 -08:00

903 lines
24 KiB
C

/*
* Texas Instruments SoC Adaptive Body Bias(ABB) Regulator
*
* Copyright (C) 2011 Texas Instruments, Inc.
* Mike Turquette <mturquette@ti.com>
*
* Copyright (C) 2012-2013 Texas Instruments, Inc.
* Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
* Nishanth Menon <nm@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
/*
* ABB LDO operating states:
* NOMINAL_OPP: bypasses the ABB LDO
* FAST_OPP: sets ABB LDO to Forward Body-Bias
* SLOW_OPP: sets ABB LDO to Reverse Body-Bias
*/
#define TI_ABB_NOMINAL_OPP 0
#define TI_ABB_FAST_OPP 1
#define TI_ABB_SLOW_OPP 3
/**
* struct ti_abb_info - ABB information per voltage setting
* @opp_sel: one of TI_ABB macro
* @vset: (optional) vset value that LDOVBB needs to be overriden with.
*
* Array of per voltage entries organized in the same order as regulator_desc's
* volt_table list. (selector is used to index from this array)
*/
struct ti_abb_info {
u32 opp_sel;
u32 vset;
};
/**
* struct ti_abb_reg - Register description for ABB block
* @setup_off: setup register offset from base
* @control_off: control register offset from base
* @sr2_wtcnt_value_mask: setup register- sr2_wtcnt_value mask
* @fbb_sel_mask: setup register- FBB sel mask
* @rbb_sel_mask: setup register- RBB sel mask
* @sr2_en_mask: setup register- enable mask
* @opp_change_mask: control register - mask to trigger LDOVBB change
* @opp_sel_mask: control register - mask for mode to operate
*/
struct ti_abb_reg {
u32 setup_off;
u32 control_off;
/* Setup register fields */
u32 sr2_wtcnt_value_mask;
u32 fbb_sel_mask;
u32 rbb_sel_mask;
u32 sr2_en_mask;
/* Control register fields */
u32 opp_change_mask;
u32 opp_sel_mask;
};
/**
* struct ti_abb - ABB instance data
* @rdesc: regulator descriptor
* @clk: clock(usually sysclk) supplying ABB block
* @base: base address of ABB block
* @setup_reg: setup register of ABB block
* @control_reg: control register of ABB block
* @int_base: interrupt register base address
* @efuse_base: (optional) efuse base address for ABB modes
* @ldo_base: (optional) LDOVBB vset override base address
* @regs: pointer to struct ti_abb_reg for ABB block
* @txdone_mask: mask on int_base for tranxdone interrupt
* @ldovbb_override_mask: mask to ldo_base for overriding default LDO VBB
* vset with value from efuse
* @ldovbb_vset_mask: mask to ldo_base for providing the VSET override
* @info: array to per voltage ABB configuration
* @current_info_idx: current index to info
* @settling_time: SoC specific settling time for LDO VBB
*/
struct ti_abb {
struct regulator_desc rdesc;
struct clk *clk;
void __iomem *base;
void __iomem *setup_reg;
void __iomem *control_reg;
void __iomem *int_base;
void __iomem *efuse_base;
void __iomem *ldo_base;
const struct ti_abb_reg *regs;
u32 txdone_mask;
u32 ldovbb_override_mask;
u32 ldovbb_vset_mask;
struct ti_abb_info *info;
int current_info_idx;
u32 settling_time;
};
/**
* ti_abb_rmw() - handy wrapper to set specific register bits
* @mask: mask for register field
* @value: value shifted to mask location and written
* @reg: register address
*
* Return: final register value (may be unused)
*/
static inline u32 ti_abb_rmw(u32 mask, u32 value, void __iomem *reg)
{
u32 val;
val = readl(reg);
val &= ~mask;
val |= (value << __ffs(mask)) & mask;
writel(val, reg);
return val;
}
/**
* ti_abb_check_txdone() - handy wrapper to check ABB tranxdone status
* @abb: pointer to the abb instance
*
* Return: true or false
*/
static inline bool ti_abb_check_txdone(const struct ti_abb *abb)
{
return !!(readl(abb->int_base) & abb->txdone_mask);
}
/**
* ti_abb_clear_txdone() - handy wrapper to clear ABB tranxdone status
* @abb: pointer to the abb instance
*/
static inline void ti_abb_clear_txdone(const struct ti_abb *abb)
{
writel(abb->txdone_mask, abb->int_base);
};
/**
* ti_abb_wait_tranx() - waits for ABB tranxdone event
* @dev: device
* @abb: pointer to the abb instance
*
* Return: 0 on success or -ETIMEDOUT if the event is not cleared on time.
*/
static int ti_abb_wait_txdone(struct device *dev, struct ti_abb *abb)
{
int timeout = 0;
bool status;
while (timeout++ <= abb->settling_time) {
status = ti_abb_check_txdone(abb);
if (status)
break;
udelay(1);
}
if (timeout > abb->settling_time) {
dev_warn_ratelimited(dev,
"%s:TRANXDONE timeout(%duS) int=0x%08x\n",
__func__, timeout, readl(abb->int_base));
return -ETIMEDOUT;
}
return 0;
}
/**
* ti_abb_clear_all_txdone() - clears ABB tranxdone event
* @dev: device
* @abb: pointer to the abb instance
*
* Return: 0 on success or -ETIMEDOUT if the event is not cleared on time.
*/
static int ti_abb_clear_all_txdone(struct device *dev, const struct ti_abb *abb)
{
int timeout = 0;
bool status;
while (timeout++ <= abb->settling_time) {
ti_abb_clear_txdone(abb);
status = ti_abb_check_txdone(abb);
if (!status)
break;
udelay(1);
}
if (timeout > abb->settling_time) {
dev_warn_ratelimited(dev,
"%s:TRANXDONE timeout(%duS) int=0x%08x\n",
__func__, timeout, readl(abb->int_base));
return -ETIMEDOUT;
}
return 0;
}
/**
* ti_abb_program_ldovbb() - program LDOVBB register for override value
* @dev: device
* @abb: pointer to the abb instance
* @info: ABB info to program
*/
static void ti_abb_program_ldovbb(struct device *dev, const struct ti_abb *abb,
struct ti_abb_info *info)
{
u32 val;
val = readl(abb->ldo_base);
/* clear up previous values */
val &= ~(abb->ldovbb_override_mask | abb->ldovbb_vset_mask);
switch (info->opp_sel) {
case TI_ABB_SLOW_OPP:
case TI_ABB_FAST_OPP:
val |= abb->ldovbb_override_mask;
val |= info->vset << __ffs(abb->ldovbb_vset_mask);
break;
}
writel(val, abb->ldo_base);
}
/**
* ti_abb_set_opp() - Setup ABB and LDO VBB for required bias
* @rdev: regulator device
* @abb: pointer to the abb instance
* @info: ABB info to program
*
* Return: 0 on success or appropriate error value when fails
*/
static int ti_abb_set_opp(struct regulator_dev *rdev, struct ti_abb *abb,
struct ti_abb_info *info)
{
const struct ti_abb_reg *regs = abb->regs;
struct device *dev = &rdev->dev;
int ret;
ret = ti_abb_clear_all_txdone(dev, abb);
if (ret)
goto out;
ti_abb_rmw(regs->fbb_sel_mask | regs->rbb_sel_mask, 0, abb->setup_reg);
switch (info->opp_sel) {
case TI_ABB_SLOW_OPP:
ti_abb_rmw(regs->rbb_sel_mask, 1, abb->setup_reg);
break;
case TI_ABB_FAST_OPP:
ti_abb_rmw(regs->fbb_sel_mask, 1, abb->setup_reg);
break;
}
/* program next state of ABB ldo */
ti_abb_rmw(regs->opp_sel_mask, info->opp_sel, abb->control_reg);
/*
* program LDO VBB vset override if needed for !bypass mode
* XXX: Do not switch sequence - for !bypass, LDO override reset *must*
* be performed *before* switch to bias mode else VBB glitches.
*/
if (abb->ldo_base && info->opp_sel != TI_ABB_NOMINAL_OPP)
ti_abb_program_ldovbb(dev, abb, info);
/* Initiate ABB ldo change */
ti_abb_rmw(regs->opp_change_mask, 1, abb->control_reg);
/* Wait for ABB LDO to complete transition to new Bias setting */
ret = ti_abb_wait_txdone(dev, abb);
if (ret)
goto out;
ret = ti_abb_clear_all_txdone(dev, abb);
if (ret)
goto out;
/*
* Reset LDO VBB vset override bypass mode
* XXX: Do not switch sequence - for bypass, LDO override reset *must*
* be performed *after* switch to bypass else VBB glitches.
*/
if (abb->ldo_base && info->opp_sel == TI_ABB_NOMINAL_OPP)
ti_abb_program_ldovbb(dev, abb, info);
out:
return ret;
}
/**
* ti_abb_set_voltage_sel() - regulator accessor function to set ABB LDO
* @rdev: regulator device
* @sel: selector to index into required ABB LDO settings (maps to
* regulator descriptor's volt_table)
*
* Return: 0 on success or appropriate error value when fails
*/
static int ti_abb_set_voltage_sel(struct regulator_dev *rdev, unsigned sel)
{
const struct regulator_desc *desc = rdev->desc;
struct ti_abb *abb = rdev_get_drvdata(rdev);
struct device *dev = &rdev->dev;
struct ti_abb_info *info, *oinfo;
int ret = 0;
if (!abb) {
dev_err_ratelimited(dev, "%s: No regulator drvdata\n",
__func__);
return -ENODEV;
}
if (!desc->n_voltages || !abb->info) {
dev_err_ratelimited(dev,
"%s: No valid voltage table entries?\n",
__func__);
return -EINVAL;
}
if (sel >= desc->n_voltages) {
dev_err(dev, "%s: sel idx(%d) >= n_voltages(%d)\n", __func__,
sel, desc->n_voltages);
return -EINVAL;
}
/* If we are in the same index as we were, nothing to do here! */
if (sel == abb->current_info_idx) {
dev_dbg(dev, "%s: Already at sel=%d\n", __func__, sel);
return ret;
}
/* If data is exactly the same, then just update index, no change */
info = &abb->info[sel];
oinfo = &abb->info[abb->current_info_idx];
if (!memcmp(info, oinfo, sizeof(*info))) {
dev_dbg(dev, "%s: Same data new idx=%d, old idx=%d\n", __func__,
sel, abb->current_info_idx);
goto out;
}
ret = ti_abb_set_opp(rdev, abb, info);
out:
if (!ret)
abb->current_info_idx = sel;
else
dev_err_ratelimited(dev,
"%s: Volt[%d] idx[%d] mode[%d] Fail(%d)\n",
__func__, desc->volt_table[sel], sel,
info->opp_sel, ret);
return ret;
}
/**
* ti_abb_get_voltage_sel() - Regulator accessor to get current ABB LDO setting
* @rdev: regulator device
*
* Return: 0 on success or appropriate error value when fails
*/
static int ti_abb_get_voltage_sel(struct regulator_dev *rdev)
{
const struct regulator_desc *desc = rdev->desc;
struct ti_abb *abb = rdev_get_drvdata(rdev);
struct device *dev = &rdev->dev;
if (!abb) {
dev_err_ratelimited(dev, "%s: No regulator drvdata\n",
__func__);
return -ENODEV;
}
if (!desc->n_voltages || !abb->info) {
dev_err_ratelimited(dev,
"%s: No valid voltage table entries?\n",
__func__);
return -EINVAL;
}
if (abb->current_info_idx >= (int)desc->n_voltages) {
dev_err(dev, "%s: Corrupted data? idx(%d) >= n_voltages(%d)\n",
__func__, abb->current_info_idx, desc->n_voltages);
return -EINVAL;
}
return abb->current_info_idx;
}
/**
* ti_abb_init_timings() - setup ABB clock timing for the current platform
* @dev: device
* @abb: pointer to the abb instance
*
* 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, abb->setup_reg);
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 u32 num_values = 6;
char *pname = "ti,abb_info";
u32 i;
unsigned int *volt_table;
int num_entries, min_uV = INT_MAX, max_uV = 0;
struct regulation_constraints *c = &rinit_data->constraints;
/*
* 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 = of_property_count_u32_elems(dev->of_node, pname);
if (num_entries < 0) {
dev_err(dev, "No '%s' property?\n", pname);
return num_entries;
}
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)
return -ENOMEM;
abb->info = info;
volt_table = devm_kzalloc(dev, sizeof(unsigned int) * num_entries,
GFP_KERNEL);
if (!volt_table)
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;
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 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_nocache(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_nocache(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");