The PLL setup is needed to use the USB ports in Linux.
This code is ported from mainline U-Boot arch/arm/mach-mvebu/cpu.c.
Signed-off-by: Jan Luebbe <jlu@xxxxxxxxxxxxxx>
---
arch/arm/mach-mvebu/armada-370-xp.c | 45 ++++++++++++++++++++++
.../mach-mvebu/include/mach/armada-370-xp-regs.h | 2 +
2 files changed, 47 insertions(+)
diff --git a/arch/arm/mach-mvebu/armada-370-xp.c b/arch/arm/mach-mvebu/armada-370-xp.c
index 93ad955a6e49..06128300254b 100644
--- a/arch/arm/mach-mvebu/armada-370-xp.c
+++ b/arch/arm/mach-mvebu/armada-370-xp.c
@@ -83,6 +83,48 @@ static void __noreturn armada_370_xp_restart_soc(struct restart_handler *rst)
hang();
}
+#define MVEBU_AXP_USB_BASE (MVEBU_REMAP_INT_REG_BASE + 0x50000)
+#define MV_USB_PHY_BASE (MVEBU_AXP_USB_BASE + 0x800)
+#define MV_USB_PHY_PLL_REG(reg) (MV_USB_PHY_BASE | (((reg) & 0xF) << 2))
+#define MV_USB_X3_BASE(addr) (MVEBU_AXP_USB_BASE | BIT(11) | \
+ (((addr) & 0xF) << 6))
+#define MV_USB_X3_PHY_CHANNEL(dev, reg) (MV_USB_X3_BASE((dev) + 1) | \
+ (((reg) & 0xF) << 2))
+
+static void setup_usb_phys(void)
+{
+ int dev;
+
+ /*
+ * USB PLL init
+ */
+
+ /* Setup PLL frequency */
+ /* USB REF frequency = 25 MHz */
+ clrsetbits_le32(MV_USB_PHY_PLL_REG(1), 0x3ff, 0x605);
+
+ /* Power up PLL and PHY channel */
+ setbits_le32(MV_USB_PHY_PLL_REG(2), BIT(9));
+
+ /* Assert VCOCAL_START */
+ setbits_le32(MV_USB_PHY_PLL_REG(1), BIT(21));
+
+ mdelay(1);
+
+ /*
+ * USB PHY init (change from defaults) specific for 40nm (78X30 78X60)
+ */
+
+ for (dev = 0; dev < 3; dev++) {
+ setbits_le32(MV_USB_X3_PHY_CHANNEL(dev, 3), BIT(15));
+
+ /* Assert REG_RCAL_START in channel REG 1 */
+ setbits_le32(MV_USB_X3_PHY_CHANNEL(dev, 1), BIT(12));
+ udelay(40);
+ clrbits_le32(MV_USB_X3_PHY_CHANNEL(dev, 1), BIT(12));
+ }
+}
+
static int armada_370_xp_init_soc(void)
{
u32 reg;
@@ -109,6 +151,9 @@ static int armada_370_xp_init_soc(void)
reg = readl(ARMADA_XP_PUP_ENABLE);
reg |= GE0_PUP_EN | GE1_PUP_EN | LCD_PUP_EN | NAND_PUP_EN | SPI_PUP_EN;
writel(reg, ARMADA_XP_PUP_ENABLE);
+
+ /* Configure USB PLL and PHYs on AXP */
+ setup_usb_phys();
}
return 0;
diff --git a/arch/arm/mach-mvebu/include/mach/armada-370-xp-regs.h b/arch/arm/mach-mvebu/include/mach/armada-370-xp-regs.h
index 1dad05317211..b972df151a74 100644
--- a/arch/arm/mach-mvebu/include/mach/armada-370-xp-regs.h
+++ b/arch/arm/mach-mvebu/include/mach/armada-370-xp-regs.h
@@ -72,4 +72,6 @@
(((port) % 4) * ARMADA_370_XP_PCIE_PORT_OFFSET))
#define PCIE_DEVICE_VENDOR_ID 0x000
+#define ARMADA_370_XP_USB_BASE (ARMADA_370_XP_INT_REGS_BASE + 0x50000)
+
#endif /* __MACH_MVEBU_ARMADA_370_XP_REGS_H */
--
2.11.0
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