PLLB may be used as input to derive the USB's 48 MHz clock.
PLLA is already being setup by currently unused sam9263_lowlevel_init(),
so add an extra parameter for PLLB as well.
While at it, we change the API of sam9263_lowlevel_init(): AT91Bootstrap
code has PLLA_SETTINGS and PLLB_SETTINGS as hex values in the headers,
so it makes porting easier by just allowing low-level barebox code to
use the values as is without having to split them up to stuff into a
struct, only to have them ORed into a single value again.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
v3:
- new patch
---
arch/arm/mach-at91/at91_pmc_ll.c | 11 +++++++++++
arch/arm/mach-at91/sam9263_ll.c | 15 +++++++--------
include/mach/at91/at91_pmc_ll.h | 1 +
include/mach/at91/sam92_ll.h | 7 +------
4 files changed, 20 insertions(+), 14 deletions(-)
diff --git a/arch/arm/mach-at91/at91_pmc_ll.c b/arch/arm/mach-at91/at91_pmc_ll.c
index 0d377b4ca720..0101623c8e39 100644
--- a/arch/arm/mach-at91/at91_pmc_ll.c
+++ b/arch/arm/mach-at91/at91_pmc_ll.c
@@ -157,6 +157,17 @@ void at91_pmc_cfg_plla(void __iomem *pmc_base, u32 pmc_pllar,
;
}
+void at91_pmc_cfg_pllb(void __iomem *pmc_base, u32 pmc_pllbr,
+ unsigned int __always_unused flags)
+{
+ /* Always disable PLL before configuring it */
+ at91_pmc_write(AT91_CKGR_PLLBR, 0);
+ at91_pmc_write(AT91_CKGR_PLLBR, pmc_pllbr);
+
+ while (!(at91_pmc_read(AT91_PMC_SR) & AT91_PMC_LOCKB))
+ ;
+}
+
void at91_pmc_cfg_mck(void __iomem *pmc_base, u32 pmc_mckr, unsigned int flags)
{
u32 tmp;
diff --git a/arch/arm/mach-at91/sam9263_ll.c b/arch/arm/mach-at91/sam9263_ll.c
index dd4ea7c938f7..a60d3c7a25be 100644
--- a/arch/arm/mach-at91/sam9263_ll.c
+++ b/arch/arm/mach-at91/sam9263_ll.c
@@ -7,7 +7,7 @@
#include <mach/at91/at91_wdt.h>
#include <mach/at91/sam92_ll.h>
-static void sam9263_pmc_init(const struct sam92_pmc_config *config)
+static void sam9263_pmc_init(u32 plla, u32 pllb)
{
unsigned flags = AT91_PMC_LL_AT91SAM9263;
u32 mckr_settings;
@@ -15,11 +15,7 @@ static void sam9263_pmc_init(const struct sam92_pmc_config *config)
at91_pmc_init(IOMEM(AT91SAM926X_BASE_PMC), flags);
/* Setting PLL A and divider A */
- at91_pmc_cfg_plla(IOMEM(AT91SAM926X_BASE_PMC),
- AT91_PMC_MUL_(config->mula) |
- AT91_PMC_OUT_2 | // 190 to 240 MHz
- config->diva, // Divider
- flags);
+ at91_pmc_cfg_plla(IOMEM(AT91SAM926X_BASE_PMC), plla, flags);
/* Selection of Master Clock and Processor Clock */
mckr_settings = AT91_PMC_PRES_1 | AT91SAM9_PMC_MDIV_2 | AT91_PMC_PDIV_1;
@@ -31,6 +27,9 @@ static void sam9263_pmc_init(const struct sam92_pmc_config *config)
/* Switch MCK on PLLA output */
at91_pmc_cfg_mck(IOMEM(AT91SAM926X_BASE_PMC),
AT91_PMC_CSS_PLLA | mckr_settings, flags);
+
+ if (pllb)
+ at91_pmc_cfg_pllb(IOMEM(AT91SAM926X_BASE_PMC), pllb, flags);
}
static inline void matrix_wr(unsigned int offset, const unsigned int value)
@@ -199,10 +198,10 @@ static void sam9263_rstc_init(void)
writel(AT91_RSTC_KEY | AT91_RSTC_URSTEN, IOMEM(AT91SAM926X_BASE_RSTC + AT91_RSTC_MR));
}
-void sam9263_lowlevel_init(const struct sam92_pmc_config *config)
+void sam9263_lowlevel_init(u32 plla, u32 pllb)
{
at91_wdt_disable(IOMEM(AT91SAM9263_BASE_WDT));
- sam9263_pmc_init(config);
+ sam9263_pmc_init(plla, pllb);
sam9263_matrix_init();
sam9263_rstc_init();
}
diff --git a/include/mach/at91/at91_pmc_ll.h b/include/mach/at91/at91_pmc_ll.h
index 9832712fe5ca..ceb7510144d8 100644
--- a/include/mach/at91/at91_pmc_ll.h
+++ b/include/mach/at91/at91_pmc_ll.h
@@ -45,6 +45,7 @@
void at91_pmc_init(void __iomem *pmc_base, unsigned int flags);
void at91_pmc_cfg_mck(void __iomem *pmc_base, u32 pmc_mckr, unsigned int flags);
void at91_pmc_cfg_plla(void __iomem *pmc_base, u32 pmc_pllar, unsigned int flags);
+void at91_pmc_cfg_pllb(void __iomem *pmc_base, u32 pmc_pllbr, unsigned int flags);
int at91_pmc_enable_generic_clock(void __iomem *pmc_base, void __iomem *sfr_base,
unsigned int periph_id,
diff --git a/include/mach/at91/sam92_ll.h b/include/mach/at91/sam92_ll.h
index 8cfccd640220..25c572bfb4f3 100644
--- a/include/mach/at91/sam92_ll.h
+++ b/include/mach/at91/sam92_ll.h
@@ -15,12 +15,7 @@
#include <mach/at91/early_udelay.h>
#include <mach/at91/iomux.h>
-struct sam92_pmc_config {
- unsigned int diva;
- unsigned int mula;
-};
-
-void sam9263_lowlevel_init(const struct sam92_pmc_config *config);
+void sam9263_lowlevel_init(u32 plla, u32 pllb);
static inline void sam92_pmc_enable_periph_clock(int clk)
{
--
2.39.2
