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Subject[PATCH v4 2/4] clk: at91: sckc: add support to specify registers bit offsets
Date
From: Claudiu Beznea <claudiu.beznea@microchip.com>

Different IPs uses different bit offsets in registers for the same
functionality, thus adapt the driver to support this.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
drivers/clk/at91/sckc.c | 93 ++++++++++++++++++++++++++++++++-----------------
1 file changed, 61 insertions(+), 32 deletions(-)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index 6c55a7a86f79..ab18b1da269f 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -23,14 +23,18 @@
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)
+
+struct clk_slow_bits {
+ u32 cr_rcen;
+ u32 cr_osc32en;
+ u32 cr_osc32byp;
+ u32 cr_oscsel;
+};

struct clk_slow_osc {
struct clk_hw hw;
void __iomem *sckcr;
+ const struct clk_slow_bits *bits;
unsigned long startup_usec;
};

@@ -39,6 +43,7 @@ struct clk_slow_osc {
struct clk_sama5d4_slow_osc {
struct clk_hw hw;
void __iomem *sckcr;
+ const struct clk_slow_bits *bits;
unsigned long startup_usec;
bool prepared;
};
@@ -48,6 +53,7 @@ struct clk_sama5d4_slow_osc {
struct clk_slow_rc_osc {
struct clk_hw hw;
void __iomem *sckcr;
+ const struct clk_slow_bits *bits;
unsigned long frequency;
unsigned long accuracy;
unsigned long startup_usec;
@@ -58,6 +64,7 @@ struct clk_slow_rc_osc {
struct clk_sam9x5_slow {
struct clk_hw hw;
void __iomem *sckcr;
+ const struct clk_slow_bits *bits;
u8 parent;
};

@@ -69,10 +76,10 @@ 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 & (osc->bits->cr_osc32byp | osc->bits->cr_osc32en))
return 0;

- writel(tmp | AT91_SCKC_OSC32EN, sckcr);
+ writel(tmp | osc->bits->cr_osc32en, sckcr);

usleep_range(osc->startup_usec, osc->startup_usec + 1);

@@ -85,10 +92,10 @@ 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 & osc->bits->cr_osc32byp)
return;

- writel(tmp & ~AT91_SCKC_OSC32EN, sckcr);
+ writel(tmp & ~osc->bits->cr_osc32en, sckcr);
}

static int clk_slow_osc_is_prepared(struct clk_hw *hw)
@@ -97,10 +104,10 @@ 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 & osc->bits->cr_osc32byp)
return 1;

- return !!(tmp & AT91_SCKC_OSC32EN);
+ return !!(tmp & osc->bits->cr_osc32en);
}

static const struct clk_ops slow_osc_ops = {
@@ -114,7 +121,8 @@ 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_bits *bits)
{
struct clk_slow_osc *osc;
struct clk_hw *hw;
@@ -137,10 +145,11 @@ at91_clk_register_slow_osc(void __iomem *sckcr,
osc->hw.init = &init;
osc->sckcr = sckcr;
osc->startup_usec = startup;
+ osc->bits = bits;

if (bypass)
- writel((readl(sckcr) & ~AT91_SCKC_OSC32EN) | AT91_SCKC_OSC32BYP,
- sckcr);
+ writel((readl(sckcr) & ~osc->bits->cr_osc32en) |
+ osc->bits->cr_osc32byp, sckcr);

hw = &osc->hw;
ret = clk_hw_register(NULL, &osc->hw);
@@ -173,7 +182,7 @@ 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) | osc->bits->cr_rcen, sckcr);

usleep_range(osc->startup_usec, osc->startup_usec + 1);

@@ -185,14 +194,14 @@ 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) & ~osc->bits->cr_rcen, 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) & osc->bits->cr_rcen);
}

static const struct clk_ops slow_rc_osc_ops = {
@@ -208,7 +217,8 @@ 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_bits *bits)
{
struct clk_slow_rc_osc *osc;
struct clk_hw *hw;
@@ -230,6 +240,7 @@ at91_clk_register_slow_rc_osc(void __iomem *sckcr,

osc->hw.init = &init;
osc->sckcr = sckcr;
+ osc->bits = bits;
osc->frequency = frequency;
osc->accuracy = accuracy;
osc->startup_usec = startup;
@@ -255,14 +266,14 @@ 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 & slowck->bits->cr_oscsel)) ||
+ (index && (tmp & slowck->bits->cr_oscsel)))
return 0;

if (index)
- tmp |= AT91_SCKC_OSCSEL;
+ tmp |= slowck->bits->cr_oscsel;
else
- tmp &= ~AT91_SCKC_OSCSEL;
+ tmp &= ~slowck->bits->cr_oscsel;

writel(tmp, sckcr);

@@ -275,7 +286,7 @@ 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) & slowck->bits->cr_oscsel);
}

static const struct clk_ops sam9x5_slow_ops = {
@@ -287,7 +298,8 @@ 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_bits *bits)
{
struct clk_sam9x5_slow *slowck;
struct clk_hw *hw;
@@ -309,7 +321,8 @@ at91_clk_register_sam9x5_slow(void __iomem *sckcr,

slowck->hw.init = &init;
slowck->sckcr = sckcr;
- slowck->parent = !!(readl(sckcr) & AT91_SCKC_OSCSEL);
+ slowck->bits = bits;
+ slowck->parent = !!(readl(sckcr) & slowck->bits->cr_oscsel);

hw = &slowck->hw;
ret = clk_hw_register(NULL, &slowck->hw);
@@ -322,7 +335,8 @@ at91_clk_register_sam9x5_slow(void __iomem *sckcr,
}

static void __init at91sam9x5_sckc_register(struct device_node *np,
- unsigned int rc_osc_startup_us)
+ unsigned int rc_osc_startup_us,
+ const struct clk_slow_bits *bits)
{
const char *parent_names[2] = { "slow_rc_osc", "slow_osc" };
void __iomem *regbase = of_iomap(np, 0);
@@ -335,7 +349,8 @@ static void __init at91sam9x5_sckc_register(struct device_node *np,
return;

hw = at91_clk_register_slow_rc_osc(regbase, parent_names[0], 32768,
- 50000000, rc_osc_startup_us);
+ 50000000, rc_osc_startup_us,
+ bits);
if (IS_ERR(hw))
return;

@@ -358,11 +373,12 @@ static void __init at91sam9x5_sckc_register(struct device_node *np,
return;

hw = at91_clk_register_slow_osc(regbase, parent_names[1], xtal_name,
- 1200000, bypass);
+ 1200000, bypass, bits);
if (IS_ERR(hw))
return;

- hw = at91_clk_register_sam9x5_slow(regbase, "slowck", parent_names, 2);
+ hw = at91_clk_register_sam9x5_slow(regbase, "slowck", parent_names, 2,
+ bits);
if (IS_ERR(hw))
return;

@@ -373,16 +389,23 @@ static void __init at91sam9x5_sckc_register(struct device_node *np,
of_clk_add_hw_provider(child, of_clk_hw_simple_get, hw);
}

+static const struct clk_slow_bits at91sam9x5_bits = {
+ .cr_rcen = BIT(0),
+ .cr_osc32en = BIT(1),
+ .cr_osc32byp = BIT(2),
+ .cr_oscsel = BIT(3),
+};
+
static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
{
- at91sam9x5_sckc_register(np, 75);
+ at91sam9x5_sckc_register(np, 75, &at91sam9x5_bits);
}
CLK_OF_DECLARE(at91sam9x5_clk_sckc, "atmel,at91sam9x5-sckc",
of_at91sam9x5_sckc_setup);

static void __init of_sama5d3_sckc_setup(struct device_node *np)
{
- at91sam9x5_sckc_register(np, 500);
+ at91sam9x5_sckc_register(np, 500, &at91sam9x5_bits);
}
CLK_OF_DECLARE(sama5d3_clk_sckc, "atmel,sama5d3-sckc",
of_sama5d3_sckc_setup);
@@ -398,7 +421,7 @@ 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) & osc->bits->cr_oscsel)) {
osc->prepared = true;
return 0;
}
@@ -421,6 +444,10 @@ static const struct clk_ops sama5d4_slow_osc_ops = {
.is_prepared = clk_sama5d4_slow_osc_is_prepared,
};

+static const struct clk_slow_bits at91sama5d4_bits = {
+ .cr_oscsel = BIT(3),
+};
+
static void __init of_sama5d4_sckc_setup(struct device_node *np)
{
void __iomem *regbase = of_iomap(np, 0);
@@ -455,6 +482,7 @@ static void __init of_sama5d4_sckc_setup(struct device_node *np)
osc->hw.init = &init;
osc->sckcr = regbase;
osc->startup_usec = 1200000;
+ osc->bits = &at91sama5d4_bits;

hw = &osc->hw;
ret = clk_hw_register(NULL, &osc->hw);
@@ -463,7 +491,8 @@ 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_bits);
if (IS_ERR(hw))
return;

--
2.7.4
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