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Message-ID: <52E142AC.4030200@ti.com>
Date: Thu, 23 Jan 2014 10:26:20 -0600
From: Nishanth Menon <nm@...com>
To: Mark Brown <broonie@...nel.org>
CC: <devicetree@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] regulator: ti-abb: Add support for interleaved LDO registers
On 01/23/2014 10:20 AM, Nishanth Menon wrote:
> On 12:29-20140123, Mark Brown wrote:
>> On Wed, Jan 22, 2014 at 04:25:23PM -0600, Nishanth Menon wrote:
>>
>>> How about something like the following? If this is acceptable, I can do
>>> a complete round of retest and ensure everything is functional on all
>>> platforms and post it as a formal patch:
>>
>> Looks OK from a quick scan. It seems nothing in mainline is using the
>> -v2 binding so it's probably OK to delete it but if it's not too much
>> bother it might be better to keep it since I expect some downstream
>> trees might've picked that up already.
> True - how about the following (formal post pending comprehensive
> testing and your feedback on approach):
>
> From 35b0c999f7ef94bf92acc17e1086af22b187943a Mon Sep 17 00:00:00 2001
> From: Nishanth Menon <nm@...com>
> Date: Thu, 23 Jan 2014 10:00:22 -0600
> Subject: [PATCH V3] regulator: ti-abb: Add support for interleaved LDO registers
>
> Certain platforms such as DRA7 have quirky memory maps such as:
> PRM_ABBLDO_DSPEVE_CTRL 0x4ae07e20
> PRM_ABBLDO_IVA_CTRL 0x4ae07e24
> other-registers
> PRM_ABBLDO_DSPEVE_SETUP 0x4ae07e30
> PRM_ABBLDO_IVA_SETUP 0x4ae07e34
>
> These need the address range allocation to be either not reserved OR unique
> allocation per register instance or use something like syscon based
> solution.
>
> By going with unique allocation per register, we are able to now have a
> single compatible driver for all instances on all platforms which use
> the IP block.
>
> So, introduce a new "ti,abb-v3" compatible to allow for definitions
> where explicit register definitions are provided, while maintaining
> backward compatibility of older predefined register offsets provided
> by "ti-abb-v1" and "ti-abb-v2".
>
> Signed-off-by: Nishanth Menon <nm@...com>
> ---
> .../bindings/regulator/ti-abb-regulator.txt | 6 +-
> drivers/regulator/ti-abb-regulator.c | 91 +++++++++++++-------
> 2 files changed, 67 insertions(+), 30 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/regulator/ti-abb-regulator.txt b/Documentation/devicetree/bindings/regulator/ti-abb-regulator.txt
> index 2e57a33..0d2dc26 100644
> --- a/Documentation/devicetree/bindings/regulator/ti-abb-regulator.txt
> +++ b/Documentation/devicetree/bindings/regulator/ti-abb-regulator.txt
> @@ -4,10 +4,14 @@ Required Properties:
> - compatible: Should be one of:
> - "ti,abb-v1" for older SoCs like OMAP3
> - "ti,abb-v2" for newer SoCs like OMAP4, OMAP5
> + - "ti,abb-v3" for a generic definition where setup and control registers are
> + provided (example: DRA7)
> - reg: Address and length of the register set for the device. It contains
> the information of registers in the same order as described by reg-names
> - reg-names: Should contain the reg names
> - - "base-address" - contains base address of ABB module
> + - "base-address" - contains base address of ABB module (ti,abb-v1,ti,abb-v2)
> + - "control-address" - contains base address of ABB module (ti,abb-v3)
> + - "setup-address" - contains base address of ABB module (ti,abb-v3)
> - "int-address" - contains address of interrupt register for ABB module
> (also see Optional properties)
> - #address-cell: should be 0
> diff --git a/drivers/regulator/ti-abb-regulator.c b/drivers/regulator/ti-abb-regulator.c
> index b187b6b..134c481 100644
> --- a/drivers/regulator/ti-abb-regulator.c
> +++ b/drivers/regulator/ti-abb-regulator.c
> @@ -54,8 +54,8 @@ struct ti_abb_info {
>
> /**
> * struct ti_abb_reg - Register description for ABB block
> - * @setup_reg: setup register offset from base
> - * @control_reg: control register offset from base
> + * @setup_off: setup register offset from base
> + * @control_off: setup 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
> @@ -64,8 +64,8 @@ struct ti_abb_info {
> * @opp_sel_mask: control register - mask for mode to operate
> */
> struct ti_abb_reg {
> - u32 setup_reg;
> - u32 control_reg;
> + u32 setup_off;
> + u32 control_off;
>
> /* Setup register fields */
> u32 sr2_wtcnt_value_mask;
> @@ -83,6 +83,8 @@ struct ti_abb_reg {
> * @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: setup 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
> @@ -99,6 +101,8 @@ 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;
> @@ -118,20 +122,18 @@ struct ti_abb {
> * ti_abb_rmw() - handy wrapper to set specific register bits
> * @mask: mask for register field
> * @value: value shifted to mask location and written
> - * @offset: offset of register
> - * @base: base address
> + * @reg: register address
> *
> * Return: final register value (may be unused)
> */
> -static inline u32 ti_abb_rmw(u32 mask, u32 value, u32 offset,
> - void __iomem *base)
> +static inline u32 ti_abb_rmw(u32 mask, u32 value, void __iomem *reg)
> {
> u32 val;
>
> - val = readl(base + offset);
> + val = readl(reg);
> val &= ~mask;
> val |= (value << __ffs(mask)) & mask;
> - writel(val, base + offset);
> + writel(val, reg);
>
> return val;
> }
> @@ -263,21 +265,20 @@ static int ti_abb_set_opp(struct regulator_dev *rdev, struct ti_abb *abb,
> if (ret)
> goto out;
>
> - ti_abb_rmw(regs->fbb_sel_mask | regs->rbb_sel_mask, 0, regs->setup_reg,
> - abb->base);
> + 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, regs->setup_reg, abb->base);
> + 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, regs->setup_reg, abb->base);
> + 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, regs->control_reg,
> - abb->base);
> + ti_abb_rmw(regs->opp_sel_mask, info->opp_sel, abb->control_reg);
>
> /*
> * program LDO VBB vset override if needed for !bypass mode
> @@ -288,7 +289,7 @@ static int ti_abb_set_opp(struct regulator_dev *rdev, struct ti_abb *abb,
> ti_abb_program_ldovbb(dev, abb, info);
>
> /* Initiate ABB ldo change */
> - ti_abb_rmw(regs->opp_change_mask, 1, regs->control_reg, abb->base);
> + 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);
> @@ -490,8 +491,8 @@ static int ti_abb_init_timings(struct device *dev, struct ti_abb *abb)
> 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);
> + ti_abb_rmw(regs->sr2_wtcnt_value_mask, sr2_wt_cnt_val,
> + abb->setup_reg);
>
> return 0;
> }
> @@ -648,8 +649,8 @@ static struct regulator_ops ti_abb_reg_ops = {
> /* 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,
> + .setup_off = 0x04,
> + .control_off = 0x00,
>
> .sr2_wtcnt_value_mask = (0xff << 8),
> .fbb_sel_mask = (0x01 << 2),
> @@ -661,8 +662,8 @@ static const struct ti_abb_reg abb_regs_v1 = {
> };
>
> static const struct ti_abb_reg abb_regs_v2 = {
> - .setup_reg = 0x00,
> - .control_reg = 0x04,
> + .setup_off = 0x00,
> + .control_off = 0x04,
>
> .sr2_wtcnt_value_mask = (0xff << 8),
> .fbb_sel_mask = (0x01 << 2),
> @@ -673,9 +674,20 @@ static const struct ti_abb_reg abb_regs_v2 = {
> .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},
> { },
> };
>
> @@ -719,14 +731,35 @@ static int ti_abb_probe(struct platform_device *pdev)
> abb = devm_kzalloc(dev, sizeof(struct ti_abb), GFP_KERNEL);
> if (!abb)
> return -ENOMEM;
> + abb->regs = devm_kzalloc(dev, sizeof(struct ti_abb_reg), GFP_KERNEL);
> + if (!abb->regs)
> + return -ENOMEM;
> abb->regs = match->data;
>
> /* Map ABB resources */
> - 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);
> + if (!abb->regs->setup_off && !abb->regs->control_off) {
Sigh.. the check was supposed to be:
if (abb->regs->setup_off || abb->regs->control_off) {
Darned.. forgot to commit! Grr... anyways.. still looking for feedback
for the remaining.
> + 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);
> @@ -860,7 +893,7 @@ skip_opt:
> 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);
> + ti_abb_rmw(abb->regs->sr2_en_mask, 1, abb->setup_reg);
>
> return 0;
> }
>
--
Regards,
Nishanth Menon
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