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Subject[PATCH v2 1/3] clk: at91: sckc: add support to specify registers bit offsets
Date
From: Claudiu Beznea <claudiu.beznea@microchip.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@microchip.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)
+
+#define AT91_SCKC_OFFSET_INVALID (32)
+
+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,
+};
+
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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