In chapter 'Advisory 2.1 USB Host Clock Drift Causes USB Spec Non-compliance in
Certain Configurations' of the TI Errata it is recommended to use certain
div/mult values for the DPLL5 clock setup.
So far u-boot used the old 34xx values, so I added the errata recommended
values specificly for 36xx init only.
Also, the FSEL registers exist no longer, so removed them from init.
Tested this on a AM3703 board with 19.2MHz oscillator, which previously couldnt
lock the dpll5 (kernel complained). As a consequence the EHCI USB port wasnt
usable in U-Boot and kernel. With this patch, kernel panics disappear and USB
working fine in u-boot and kernel.
Signed-off-by: Andreas Naumann <anaum...@ultratronik.de>
---
arch/arm/cpu/armv7/omap3/clock.c | 20 +++++++++++++++++++-
arch/arm/cpu/armv7/omap3/lowlevel_init.S | 18 ++++++++++++++++++
arch/arm/include/asm/arch-omap3/clocks_omap3.h | 22 ++++++++++++++++++++++
3 files changed, 59 insertions(+), 1 deletion(-)
diff --git a/arch/arm/cpu/armv7/omap3/clock.c b/arch/arm/cpu/armv7/omap3/clock.c
index 81cc859..68833ba 100644
--- a/arch/arm/cpu/armv7/omap3/clock.c
+++ b/arch/arm/cpu/armv7/omap3/clock.c
@@ -491,6 +491,24 @@ static void dpll4_init_36xx(u32 sil_index, u32 clk_index)
wait_on_value(ST_PERIPH_CLK, 2, &prcm_base->idlest_ckgen, LDELAY);
}
+static void dpll5_init_36xx(u32 sil_index, u32 clk_index)
+{
+ struct prcm *prcm_base = (struct prcm *)PRCM_BASE;
+ dpll_param *ptr = (dpll_param *) get_36x_per2_dpll_param();
+
+ /* Moving it to the right sysclk base */
+ ptr = ptr + clk_index;
+
+ /* PER2 DPLL (DPLL5) */
+ sr32(&prcm_base->clken2_pll, 0, 3, PLL_STOP);
+ wait_on_value(1, 0, &prcm_base->idlest2_ckgen, LDELAY);
+ sr32(&prcm_base->clksel5_pll, 0, 5, ptr->m2); /* set M2 (usbtll_fck) */
+ sr32(&prcm_base->clksel4_pll, 8, 11, ptr->m); /* set m (11-bit
multiplier) */
+ sr32(&prcm_base->clksel4_pll, 0, 7, ptr->n); /* set n (7-bit divider)*/
+ sr32(&prcm_base->clken2_pll, 0, 3, PLL_LOCK); /* lock mode */
+ wait_on_value(1, 1, &prcm_base->idlest2_ckgen, LDELAY);
+}
+
static void mpu_init_36xx(u32 sil_index, u32 clk_index)
{
struct prcm *prcm_base = (struct prcm *)PRCM_BASE;
@@ -595,7 +613,7 @@ void prcm_init(void)
dpll3_init_36xx(0, clk_index);
dpll4_init_36xx(0, clk_index);
- dpll5_init_34xx(0, clk_index);
+ dpll5_init_36xx(0, clk_index);
iva_init_36xx(0, clk_index);
mpu_init_36xx(0, clk_index);
diff --git a/arch/arm/cpu/armv7/omap3/lowlevel_init.S
b/arch/arm/cpu/armv7/omap3/lowlevel_init.S
index eacfef8..66a1b48 100644
--- a/arch/arm/cpu/armv7/omap3/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/omap3/lowlevel_init.S
@@ -480,6 +480,19 @@ per_36x_dpll_param:
.word 26000, 432, 12, 9, 16, 9, 4, 3, 1
.word 38400, 360, 15, 9, 16, 5, 4, 3, 1
+per2_36x_dpll_param:
+/* 12MHz */
+.word PER2_36XX_M_12, PER2_36XX_N_12, 0, PER2_36XX_M2_12
+/* 13MHz */
+.word PER2_36XX_M_13, PER2_36XX_N_13, 0, PER2_36XX_M2_13
+/* 19.2MHz */
+.word PER2_36XX_M_19P2, PER2_36XX_N_19P2, 0, PER2_36XX_M2_19P2
+/* 26MHz */
+.word PER2_36XX_M_26, PER2_36XX_N_26, 0, PER2_36XX_M2_26
+/* 38.4MHz */
+.word PER2_36XX_M_38P4, PER2_36XX_N_38P4, 0, PER2_36XX_M2_38P4
+
+
ENTRY(get_36x_mpu_dpll_param)
adr r0, mpu_36x_dpll_param
mov pc, lr
@@ -499,3 +512,8 @@ ENTRY(get_36x_per_dpll_param)
adr r0, per_36x_dpll_param
mov pc, lr
ENDPROC(get_36x_per_dpll_param)
+
+ENTRY(get_36x_per2_dpll_param)
+ adr r0, per2_36x_dpll_param
+ mov pc, lr
+ENDPROC(get_36x_per2_dpll_param)
diff --git a/arch/arm/include/asm/arch-omap3/clocks_omap3.h
b/arch/arm/include/asm/arch-omap3/clocks_omap3.h
index 5925ac4..59e61e8 100644
--- a/arch/arm/include/asm/arch-omap3/clocks_omap3.h
+++ b/arch/arm/include/asm/arch-omap3/clocks_omap3.h
@@ -336,4 +336,26 @@
#define PER_36XX_FSEL_38P4 0x07
#define PER_36XX_M2_38P4 0x09
+/* 36XX PER2 DPLL */
+
+#define PER2_36XX_M_12 0x50
+#define PER2_36XX_N_12 0x00
+#define PER2_36XX_M2_12 0x08
+
+#define PER2_36XX_M_13 0x1BB
+#define PER2_36XX_N_13 0x05
+#define PER2_36XX_M2_13 0x08
+
+#define PER2_36XX_M_19P2 0x32
+#define PER2_36XX_N_19P2 0x00
+#define PER2_36XX_M2_19P2 0x08
+
+#define PER2_36XX_M_26 0x1BB
+#define PER2_36XX_N_26 0x0B
+#define PER2_36XX_M2_26 0x08
+
+#define PER2_36XX_M_38P4 0x19
+#define PER2_36XX_N_38P4 0x00
+#define PER2_36XX_M2_38P4 0x08
+
#endif /* endif _CLOCKS_OMAP3_H_ */
--
1.8.3.1
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