USB: Armada100: Add UTMI PHY interface driver

This patch adds USB host controller's UTMI PHY interface driver for
Armada100 SOCs.

Signed-off-by: Ajay Bhargav <ajay.bhargav@einfochips.com>

arch/arm/include/asm/arch-armada100/armada100.h

@@ -43,6 +43,14 @@
 #define SSP2_APBCLK		0x01
 #define SSP2_FNCLK		0x02
 
+/* USB Clock/reset control bits */
+#define USB_SPH_AXICLK_EN	0x10
+#define USB_SPH_AXI_RST		0x02
+
+/* MPMU Clocks */
+#define APB2_26M_EN		(1 << 20)
+#define AP_26M			(1 << 4)
+
 /* Register Base Addresses */
 #define ARMD1_DRAM_BASE		0xB0000000
 #define ARMD1_FEC_BASE		0xC0800000

arch/arm/include/asm/arch-armada100/utmi-armada100.h

@@ -0,0 +1,79 @@
+/*
+ * (C) Copyright 2012
+ * eInfochips Ltd. <www.einfochips.com>
+ * Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
+ *
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#ifndef __UTMI_ARMADA100__
+#define __UTMI_ARMADA100__
+
+#define UTMI_PHY_BASE		0xD4206000
+
+/* utmi_ctrl - bits */
+#define INPKT_DELAY_SOF		(1 << 28)
+#define PLL_PWR_UP		2
+#define PHY_PWR_UP		1
+
+/* utmi_pll - bits */
+#define PLL_FBDIV_MASK		0x00000FF0
+#define PLL_FBDIV		4
+#define PLL_REFDIV_MASK		0x0000000F
+#define PLL_REFDIV		0
+#define PLL_READY		0x800000
+#define VCOCAL_START		(1 << 21)
+
+#define N_DIVIDER		0xEE
+#define M_DIVIDER		0x0B
+
+/* utmi_tx - bits */
+#define CK60_PHSEL		17
+#define PHSEL_VAL		0x4
+#define RCAL_START		(1 << 12)
+
+/*
+ * USB PHY registers
+ * Refer Datasheet Appendix A.21
+ */
+struct armd1usb_phy_reg {
+	u32 utmi_rev;	/* USB PHY Revision */
+	u32 utmi_ctrl;	/* USB PHY Control register */
+	u32 utmi_pll;	/* PLL register */
+	u32 utmi_tx;	/* Tx register */
+	u32 utmi_rx;	/* Rx register */
+	u32 utmi_ivref;	/* IVREF register */
+	u32 utmi_tst_g0;	/* Test group 0 register */
+	u32 utmi_tst_g1;	/* Test group 1 register */
+	u32 utmi_tst_g2;	/* Test group 2 register */
+	u32 utmi_tst_g3;	/* Test group 3 register */
+	u32 utmi_tst_g4;	/* Test group 4 register */
+	u32 utmi_tst_g5;	/* Test group 5 register */
+	u32 utmi_reserve;	/* Reserve Register */
+	u32 utmi_usb_int;	/* USB interuppt register */
+	u32 utmi_dbg_ctl;	/* Debug control register */
+	u32 utmi_otg_addon;	/* OTG addon register */
+};
+
+int utmi_init(void);
+
+#endif /* __UTMI_ARMADA100__ */

drivers/usb/host/utmi-armada100.c

@@ -0,0 +1,96 @@
+/*
+ * (C) Copyright 2012
+ * eInfochips Ltd. <www.einfochips.com>
+ * Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
+ *
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <usb.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/armada100.h>
+#include <asm/arch/utmi-armada100.h>
+
+static int utmi_phy_init(void)
+{
+	struct armd1usb_phy_reg *phy_regs =
+		(struct armd1usb_phy_reg *)UTMI_PHY_BASE;
+	int timeout;
+
+	setbits_le32(&phy_regs->utmi_ctrl, INPKT_DELAY_SOF | PLL_PWR_UP);
+	udelay(1000);
+	setbits_le32(&phy_regs->utmi_ctrl, PHY_PWR_UP);
+
+	clrbits_le32(&phy_regs->utmi_pll, PLL_FBDIV_MASK | PLL_REFDIV_MASK);
+	setbits_le32(&phy_regs->utmi_pll, N_DIVIDER << PLL_FBDIV | M_DIVIDER);
+
+	setbits_le32(&phy_regs->utmi_tx, PHSEL_VAL << CK60_PHSEL);
+
+	/* Calibrate pll */
+	timeout = 10000;
+	while (--timeout && ((readl(&phy_regs->utmi_pll) & PLL_READY) == 0))
+		;
+	if (!timeout)
+		return -1;
+
+	udelay(200);
+	setbits_le32(&phy_regs->utmi_pll, VCOCAL_START);
+	udelay(400);
+	clrbits_le32(&phy_regs->utmi_pll, VCOCAL_START);
+
+	udelay(200);
+	setbits_le32(&phy_regs->utmi_tx, RCAL_START);
+	udelay(400);
+	clrbits_le32(&phy_regs->utmi_tx, RCAL_START);
+
+	timeout = 10000;
+	while (--timeout && ((readl(&phy_regs->utmi_pll) & PLL_READY) == 0))
+		;
+	if (!timeout)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * Initialize USB host controller's UTMI Physical interface
+ */
+int utmi_init(void)
+{
+	struct armd1mpmu_registers *mpmu_regs =
+		(struct armd1mpmu_registers *)ARMD1_MPMU_BASE;
+
+	struct armd1apmu_registers *apmu_regs =
+		(struct armd1apmu_registers *)ARMD1_APMU_BASE;
+
+	/* Turn on 26Mhz ref clock for UTMI PLL */
+	setbits_le32(&mpmu_regs->acgr, APB2_26M_EN | AP_26M);
+
+	/* USB Clock reset */
+	writel(USB_SPH_AXICLK_EN, &apmu_regs->usbcrc);
+	writel(USB_SPH_AXICLK_EN | USB_SPH_AXI_RST, &apmu_regs->usbcrc);
+
+	/* Initialize UTMI transceiver */
+	return utmi_phy_init();
+}