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Message-ID: <8af47d4c-667f-bee1-e710-4f3276a944af@microchip.com>
Date: Tue, 19 Feb 2019 09:17:52 +0000
From: <Claudiu.Beznea@...rochip.com>
To: <alexandre.belloni@...tlin.com>
CC: <mturquette@...libre.com>, <sboyd@...nel.org>,
<robh+dt@...nel.org>, <mark.rutland@....com>,
<Nicolas.Ferre@...rochip.com>, <Ludovic.Desroches@...rochip.com>,
<linux-clk@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] clk: at91: sckc: add support to specify registers
bit offsets
Hi,
On 18.02.2019 23:08, Alexandre Belloni wrote:
> Hi,
>
> On 14/02/2019 12:14:28+0000, Claudiu.Beznea@...rochip.com wrote:
>> From: Claudiu Beznea <claudiu.beznea@...rochip.com>
>>
>> Different IPs uses different offsets in registers for the same
>> functionality, thus adapt the driver to support this.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>> ---
>> drivers/clk/at91/sckc.c | 112 +++++++++++++++++++++++++++++++++---------------
>> 1 file changed, 77 insertions(+), 35 deletions(-)
>>
>> diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
>> index ab6ecefc49ad..b7163d3a2269 100644
>> --- a/drivers/clk/at91/sckc.c
>> +++ b/drivers/clk/at91/sckc.c
>> @@ -22,15 +22,25 @@
>> #define SLOWCK_SW_TIME_USEC ((SLOWCK_SW_CYCLES * USEC_PER_SEC) / \
>> SLOW_CLOCK_FREQ)
>>
>> -#define AT91_SCKC_CR 0x00
>> -#define AT91_SCKC_RCEN (1 << 0)
>> -#define AT91_SCKC_OSC32EN (1 << 1)
>> -#define AT91_SCKC_OSC32BYP (1 << 2)
>> -#define AT91_SCKC_OSCSEL (1 << 3)
>> +#define AT91_SCKC_CR 0x00
>> +#define AT91_SCKC_RCEN(off) (1 << (off)->cr_rcen)
>> +#define AT91_SCKC_OSC32EN(off) (1 << (off)->cr_osc32en)
>> +#define AT91_SCKC_OSC32BYP(off) (1 << (off)->cr_osc32byp)
>> +#define AT91_SCKC_OSCSEL(off) (1 << (off)->cr_oscsel)
>
> You don't need those macros if you store BIT(off) instead of off in the
> members of clk_slow_offsets.
Ok, I'll take care of it.
>
>> +
>> +#define AT91_SCKC_OFFSET_INVALID (32)
>> +
>
> This would also remove the need for that define as 0 would mean that the
> bit doesn't exist.
Agree.
>
>> +struct clk_slow_offsets {
>> + u8 cr_rcen;
>> + u8 cr_osc32en;
>> + u8 cr_osc32byp;
>> + u8 cr_oscsel;
>> +};
>>
>> struct clk_slow_osc {
>> struct clk_hw hw;
>> void __iomem *sckcr;
>> + const struct clk_slow_offsets *offsets;
>> unsigned long startup_usec;
>> };
>>
>> @@ -39,6 +49,7 @@ struct clk_slow_osc {
>> struct clk_sama5d4_slow_osc {
>> struct clk_hw hw;
>> void __iomem *sckcr;
>> + const struct clk_slow_offsets *offsets;
>> unsigned long startup_usec;
>> bool prepared;
>> };
>> @@ -48,6 +59,7 @@ struct clk_sama5d4_slow_osc {
>> struct clk_slow_rc_osc {
>> struct clk_hw hw;
>> void __iomem *sckcr;
>> + const struct clk_slow_offsets *offsets;
>> unsigned long frequency;
>> unsigned long accuracy;
>> unsigned long startup_usec;
>> @@ -58,6 +70,7 @@ struct clk_slow_rc_osc {
>> struct clk_sam9x5_slow {
>> struct clk_hw hw;
>> void __iomem *sckcr;
>> + const struct clk_slow_offsets *offsets;
>> u8 parent;
>> };
>>
>> @@ -69,10 +82,11 @@ static int clk_slow_osc_prepare(struct clk_hw *hw)
>> void __iomem *sckcr = osc->sckcr;
>> u32 tmp = readl(sckcr);
>>
>> - if (tmp & (AT91_SCKC_OSC32BYP | AT91_SCKC_OSC32EN))
>> + if (tmp & (AT91_SCKC_OSC32BYP(osc->offsets) |
>> + AT91_SCKC_OSC32EN(osc->offsets)))
>> return 0;
>>
>> - writel(tmp | AT91_SCKC_OSC32EN, sckcr);
>> + writel(tmp | AT91_SCKC_OSC32EN(osc->offsets), sckcr);
>>
>> usleep_range(osc->startup_usec, osc->startup_usec + 1);
>>
>> @@ -85,10 +99,10 @@ static void clk_slow_osc_unprepare(struct clk_hw *hw)
>> void __iomem *sckcr = osc->sckcr;
>> u32 tmp = readl(sckcr);
>>
>> - if (tmp & AT91_SCKC_OSC32BYP)
>> + if (tmp & AT91_SCKC_OSC32BYP(osc->offsets))
>> return;
>>
>> - writel(tmp & ~AT91_SCKC_OSC32EN, sckcr);
>> + writel(tmp & ~AT91_SCKC_OSC32EN(osc->offsets), sckcr);
>> }
>>
>> static int clk_slow_osc_is_prepared(struct clk_hw *hw)
>> @@ -97,10 +111,10 @@ static int clk_slow_osc_is_prepared(struct clk_hw *hw)
>> void __iomem *sckcr = osc->sckcr;
>> u32 tmp = readl(sckcr);
>>
>> - if (tmp & AT91_SCKC_OSC32BYP)
>> + if (tmp & AT91_SCKC_OSC32BYP(osc->offsets))
>> return 1;
>>
>> - return !!(tmp & AT91_SCKC_OSC32EN);
>> + return !!(tmp & AT91_SCKC_OSC32EN(osc->offsets));
>> }
>>
>> static const struct clk_ops slow_osc_ops = {
>> @@ -114,7 +128,8 @@ at91_clk_register_slow_osc(void __iomem *sckcr,
>> const char *name,
>> const char *parent_name,
>> unsigned long startup,
>> - bool bypass)
>> + bool bypass,
>> + const struct clk_slow_offsets *offsets)
>> {
>> struct clk_slow_osc *osc;
>> struct clk_hw *hw;
>> @@ -137,9 +152,11 @@ at91_clk_register_slow_osc(void __iomem *sckcr,
>> osc->hw.init = &init;
>> osc->sckcr = sckcr;
>> osc->startup_usec = startup;
>> + osc->offsets = offsets;
>>
>> if (bypass)
>> - writel((readl(sckcr) & ~AT91_SCKC_OSC32EN) | AT91_SCKC_OSC32BYP,
>> + writel((readl(sckcr) & ~AT91_SCKC_OSC32EN(osc->offsets)) |
>> + AT91_SCKC_OSC32BYP(osc->offsets),
>> sckcr);
>>
>> hw = &osc->hw;
>> @@ -153,7 +170,8 @@ at91_clk_register_slow_osc(void __iomem *sckcr,
>> }
>>
>> static void __init
>> -of_at91sam9x5_clk_slow_osc_setup(struct device_node *np, void __iomem *sckcr)
>> +of_at91sam9x5_clk_slow_osc_setup(struct device_node *np, void __iomem *sckcr,
>> + const struct clk_slow_offsets *offsets)
>> {
>> struct clk_hw *hw;
>> const char *parent_name;
>> @@ -167,7 +185,7 @@ of_at91sam9x5_clk_slow_osc_setup(struct device_node *np, void __iomem *sckcr)
>> bypass = of_property_read_bool(np, "atmel,osc-bypass");
>>
>> hw = at91_clk_register_slow_osc(sckcr, name, parent_name, startup,
>> - bypass);
>> + bypass, offsets);
>> if (IS_ERR(hw))
>> return;
>>
>> @@ -195,7 +213,7 @@ static int clk_slow_rc_osc_prepare(struct clk_hw *hw)
>> struct clk_slow_rc_osc *osc = to_clk_slow_rc_osc(hw);
>> void __iomem *sckcr = osc->sckcr;
>>
>> - writel(readl(sckcr) | AT91_SCKC_RCEN, sckcr);
>> + writel(readl(sckcr) | AT91_SCKC_RCEN(osc->offsets), sckcr);
>>
>> usleep_range(osc->startup_usec, osc->startup_usec + 1);
>>
>> @@ -207,14 +225,14 @@ static void clk_slow_rc_osc_unprepare(struct clk_hw *hw)
>> struct clk_slow_rc_osc *osc = to_clk_slow_rc_osc(hw);
>> void __iomem *sckcr = osc->sckcr;
>>
>> - writel(readl(sckcr) & ~AT91_SCKC_RCEN, sckcr);
>> + writel(readl(sckcr) & ~AT91_SCKC_RCEN(osc->offsets), sckcr);
>> }
>>
>> static int clk_slow_rc_osc_is_prepared(struct clk_hw *hw)
>> {
>> struct clk_slow_rc_osc *osc = to_clk_slow_rc_osc(hw);
>>
>> - return !!(readl(osc->sckcr) & AT91_SCKC_RCEN);
>> + return !!(readl(osc->sckcr) & AT91_SCKC_RCEN(osc->offsets));
>> }
>>
>> static const struct clk_ops slow_rc_osc_ops = {
>> @@ -230,7 +248,8 @@ at91_clk_register_slow_rc_osc(void __iomem *sckcr,
>> const char *name,
>> unsigned long frequency,
>> unsigned long accuracy,
>> - unsigned long startup)
>> + unsigned long startup,
>> + const struct clk_slow_offsets *offsets)
>> {
>> struct clk_slow_rc_osc *osc;
>> struct clk_hw *hw;
>> @@ -252,6 +271,7 @@ at91_clk_register_slow_rc_osc(void __iomem *sckcr,
>>
>> osc->hw.init = &init;
>> osc->sckcr = sckcr;
>> + osc->offsets = offsets;
>> osc->frequency = frequency;
>> osc->accuracy = accuracy;
>> osc->startup_usec = startup;
>> @@ -267,7 +287,8 @@ at91_clk_register_slow_rc_osc(void __iomem *sckcr,
>> }
>>
>> static void __init
>> -of_at91sam9x5_clk_slow_rc_osc_setup(struct device_node *np, void __iomem *sckcr)
>> +of_at91sam9x5_clk_slow_rc_osc_setup(struct device_node *np, void __iomem *sckcr,
>> + const struct clk_slow_offsets *offsets)
>> {
>> struct clk_hw *hw;
>> u32 frequency = 0;
>> @@ -281,7 +302,7 @@ of_at91sam9x5_clk_slow_rc_osc_setup(struct device_node *np, void __iomem *sckcr)
>> of_property_read_u32(np, "atmel,startup-time-usec", &startup);
>>
>> hw = at91_clk_register_slow_rc_osc(sckcr, name, frequency, accuracy,
>> - startup);
>> + startup, offsets);
>> if (IS_ERR(hw))
>> return;
>>
>> @@ -299,14 +320,14 @@ static int clk_sam9x5_slow_set_parent(struct clk_hw *hw, u8 index)
>>
>> tmp = readl(sckcr);
>>
>> - if ((!index && !(tmp & AT91_SCKC_OSCSEL)) ||
>> - (index && (tmp & AT91_SCKC_OSCSEL)))
>> + if ((!index && !(tmp & AT91_SCKC_OSCSEL(slowck->offsets))) ||
>> + (index && (tmp & AT91_SCKC_OSCSEL(slowck->offsets))))
>> return 0;
>>
>> if (index)
>> - tmp |= AT91_SCKC_OSCSEL;
>> + tmp |= AT91_SCKC_OSCSEL(slowck->offsets);
>> else
>> - tmp &= ~AT91_SCKC_OSCSEL;
>> + tmp &= ~AT91_SCKC_OSCSEL(slowck->offsets);
>>
>> writel(tmp, sckcr);
>>
>> @@ -319,7 +340,7 @@ static u8 clk_sam9x5_slow_get_parent(struct clk_hw *hw)
>> {
>> struct clk_sam9x5_slow *slowck = to_clk_sam9x5_slow(hw);
>>
>> - return !!(readl(slowck->sckcr) & AT91_SCKC_OSCSEL);
>> + return !!(readl(slowck->sckcr) & AT91_SCKC_OSCSEL(slowck->offsets));
>> }
>>
>> static const struct clk_ops sam9x5_slow_ops = {
>> @@ -331,7 +352,8 @@ static struct clk_hw * __init
>> at91_clk_register_sam9x5_slow(void __iomem *sckcr,
>> const char *name,
>> const char **parent_names,
>> - int num_parents)
>> + int num_parents,
>> + const struct clk_slow_offsets *offsets)
>> {
>> struct clk_sam9x5_slow *slowck;
>> struct clk_hw *hw;
>> @@ -353,7 +375,8 @@ at91_clk_register_sam9x5_slow(void __iomem *sckcr,
>>
>> slowck->hw.init = &init;
>> slowck->sckcr = sckcr;
>> - slowck->parent = !!(readl(sckcr) & AT91_SCKC_OSCSEL);
>> + slowck->offsets = offsets;
>> + slowck->parent = !!(readl(sckcr) & AT91_SCKC_OSCSEL(slowck->offsets));
>>
>> hw = &slowck->hw;
>> ret = clk_hw_register(NULL, &slowck->hw);
>> @@ -366,7 +389,8 @@ at91_clk_register_sam9x5_slow(void __iomem *sckcr,
>> }
>>
>> static void __init
>> -of_at91sam9x5_clk_slow_setup(struct device_node *np, void __iomem *sckcr)
>> +of_at91sam9x5_clk_slow_setup(struct device_node *np, void __iomem *sckcr,
>> + const struct clk_slow_offsets *offsets)
>> {
>> struct clk_hw *hw;
>> const char *parent_names[2];
>> @@ -382,7 +406,7 @@ of_at91sam9x5_clk_slow_setup(struct device_node *np, void __iomem *sckcr)
>> of_property_read_string(np, "clock-output-names", &name);
>>
>> hw = at91_clk_register_sam9x5_slow(sckcr, name, parent_names,
>> - num_parents);
>> + num_parents, offsets);
>> if (IS_ERR(hw))
>> return;
>>
>> @@ -406,10 +430,18 @@ static const struct of_device_id sckc_clk_ids[] __initconst = {
>> { /*sentinel*/ }
>> };
>>
>> +static const struct clk_slow_offsets at91sam9x5_offsets = {
>> + .cr_rcen = 0,
>> + .cr_osc32en = 1,
>> + .cr_osc32byp = 2,
>> + .cr_oscsel = 3,
>> +};
>> +
>> static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
>> {
>> struct device_node *childnp;
>> - void (*clk_setup)(struct device_node *, void __iomem *);
>> + void (*clk_setup)(struct device_node *np, void __iomem *io,
>> + const struct clk_slow_offsets *offsets);
>> const struct of_device_id *clk_id;
>> void __iomem *regbase = of_iomap(np, 0);
>>
>> @@ -421,7 +453,7 @@ static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
>> if (!clk_id)
>> continue;
>> clk_setup = clk_id->data;
>> - clk_setup(childnp, regbase);
>> + clk_setup(childnp, regbase, &at91sam9x5_offsets);
>> }
>> }
>> CLK_OF_DECLARE(at91sam9x5_clk_sckc, "atmel,at91sam9x5-sckc",
>> @@ -438,7 +470,7 @@ static int clk_sama5d4_slow_osc_prepare(struct clk_hw *hw)
>> * Assume that if it has already been selected (for example by the
>> * bootloader), enough time has aready passed.
>> */
>> - if ((readl(osc->sckcr) & AT91_SCKC_OSCSEL)) {
>> + if ((readl(osc->sckcr) & AT91_SCKC_OSCSEL(osc->offsets))) {
>> osc->prepared = true;
>> return 0;
>> }
>> @@ -461,6 +493,13 @@ static const struct clk_ops sama5d4_slow_osc_ops = {
>> .is_prepared = clk_sama5d4_slow_osc_is_prepared,
>> };
>>
>> +static const struct clk_slow_offsets at91sama5d4_offsets = {
>> + .cr_rcen = AT91_SCKC_OFFSET_INVALID,
>> + .cr_osc32en = AT91_SCKC_OFFSET_INVALID,
>> + .cr_osc32byp = AT91_SCKC_OFFSET_INVALID,
>> + .cr_oscsel = 3,
>> +};
>> +
>
> I don't think you need to change the sama5d4 part as it is not affected
> by any change in the sam9x5 part.
Ok.
>
>> static void __init of_sama5d4_sckc_setup(struct device_node *np)
>> {
>> void __iomem *regbase = of_iomap(np, 0);
>> @@ -498,9 +537,11 @@ static void __init of_sama5d4_sckc_setup(struct device_node *np)
>> osc->hw.init = &init;
>> osc->sckcr = regbase;
>> osc->startup_usec = 1200000;
>> + osc->offsets = &at91sama5d4_offsets;
>>
>> if (bypass)
>> - writel((readl(regbase) | AT91_SCKC_OSC32BYP), regbase);
>> + writel((readl(regbase) | AT91_SCKC_OSC32BYP(osc->offsets)),
>> + regbase);
>>
>> hw = &osc->hw;
>> ret = clk_hw_register(NULL, &osc->hw);
>> @@ -509,7 +550,8 @@ static void __init of_sama5d4_sckc_setup(struct device_node *np)
>> return;
>> }
>>
>> - hw = at91_clk_register_sam9x5_slow(regbase, "slowck", parent_names, 2);
>> + hw = at91_clk_register_sam9x5_slow(regbase, "slowck", parent_names, 2,
>> + &at91sama5d4_offsets);
>> if (IS_ERR(hw))
>> return;
>>
>> --
>> 2.7.4
>>
>
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