ARM: OMAP: USB: Change omap USB code to use omap_read/write instead of __REG

Change omap USB code to use omap_read/write instead of __REG for multi-omap

Cc: David Brownell <david-b@pacbell.net>
Cc: linux-usb@vger.kernel.org
Cc: i2c@lm-sensors.org
Signed-off-by: Tony Lindgren <tony@atomide.com>

7 files changed, 499 insertions, 357 deletions

diff --git a/arch/arm/mach-omap1/board-osk.c b/arch/arm/mach-omap1/board-osk.c
index 82ec34c43bc..845c66371ca 100644
--- a/arch/arm/mach-omap1/board-osk.c
+++ b/arch/arm/mach-omap1/board-osk.c
@@ -546,7 +546,10 @@ static void __init osk_init(void)
 	platform_add_devices(osk5912_devices, ARRAY_SIZE(osk5912_devices));
 	omap_board_config = osk_config;
 	omap_board_config_size = ARRAY_SIZE(osk_config);
-	USB_TRANSCEIVER_CTRL_REG |= (3 << 1);
+
+	l = omap_readl(USB_TRANSCEIVER_CTRL);
+	l |= (3 << 1);
+	omap_writel(l, USB_TRANSCEIVER_CTRL);
 
 	/* irq for tps65010 chip */
 	/* bootloader effectively does:  omap_cfg_reg(U19_1610_MPUIO1); */
diff --git a/arch/arm/plat-omap/usb.c b/arch/arm/plat-omap/usb.c
index a619475c4b7..2699c16d4da 100644
--- a/arch/arm/plat-omap/usb.c
+++ b/arch/arm/plat-omap/usb.c
@@ -1,4 +1,4 @@
-/*
+ /*
  * arch/arm/plat-omap/usb.c -- platform level USB initialization
  *
  * Copyright (C) 2004 Texas Instruments, Inc.
@@ -156,8 +156,12 @@ static u32 __init omap_usb0_init(unsigned nwires, unsigned is_device)
 
 	if (nwires == 0) {
 		if (cpu_class_is_omap1() && !cpu_is_omap15xx()) {
+			u32 l;
+
 			/* pulldown D+/D- */
-			USB_TRANSCEIVER_CTRL_REG &= ~(3 << 1);
+			l = omap_readl(USB_TRANSCEIVER_CTRL);
+			l &= ~(3 << 1);
+			omap_writel(l, USB_TRANSCEIVER_CTRL);
 		}
 		return 0;
 	}
@@ -171,6 +175,8 @@ static u32 __init omap_usb0_init(unsigned nwires, unsigned is_device)
 
 	/* internal transceiver (unavailable on 17xx, 24xx) */
 	if (!cpu_class_is_omap2() && nwires == 2) {
+		u32 l;
+
 		// omap_cfg_reg(P9_USB_DP);
 		// omap_cfg_reg(R8_USB_DM);
 
@@ -185,9 +191,11 @@ static u32 __init omap_usb0_init(unsigned nwires, unsigned is_device)
 		 *  - OTG support on this port not yet written
 		 */
 
-		USB_TRANSCEIVER_CTRL_REG &= ~(7 << 4);
+		l = omap_readl(USB_TRANSCEIVER_CTRL);
+		l &= ~(7 << 4);
 		if (!is_device)
-			USB_TRANSCEIVER_CTRL_REG |= (3 << 1);
+			l |= (3 << 1);
+		omap_writel(l, USB_TRANSCEIVER_CTRL);
 
 		return 3 << 16;
 	}
@@ -217,8 +225,13 @@ static u32 __init omap_usb0_init(unsigned nwires, unsigned is_device)
 	 * with VBUS switching and overcurrent detection.
 	 */
 
-	if (cpu_class_is_omap1() && nwires != 6)
-		USB_TRANSCEIVER_CTRL_REG &= ~CONF_USB2_UNI_R;
+	if (cpu_class_is_omap1() && nwires != 6) {
+		u32 l;
+
+		l = omap_readl(USB_TRANSCEIVER_CTRL);
+		l &= ~CONF_USB2_UNI_R;
+		omap_writel(l, USB_TRANSCEIVER_CTRL);
+	}
 
 	switch (nwires) {
 	case 3:
@@ -238,9 +251,13 @@ static u32 __init omap_usb0_init(unsigned nwires, unsigned is_device)
 			omap_cfg_reg(K20_24XX_USB0_VM);
 			omap2_usb_devconf_set(0, USB_UNIDIR);
 		} else {
+			u32 l;
+
 			omap_cfg_reg(AA9_USB0_VP);
 			omap_cfg_reg(R9_USB0_VM);
-			USB_TRANSCEIVER_CTRL_REG |= CONF_USB2_UNI_R;
+			l = omap_readl(USB_TRANSCEIVER_CTRL);
+			l |= CONF_USB2_UNI_R;
+			omap_writel(l, USB_TRANSCEIVER_CTRL);
 		}
 		break;
 	default:
@@ -254,8 +271,13 @@ static u32 __init omap_usb1_init(unsigned nwires)
 {
 	u32	syscon1 = 0;
 
-	if (cpu_class_is_omap1() && !cpu_is_omap15xx() && nwires != 6)
-		USB_TRANSCEIVER_CTRL_REG &= ~CONF_USB1_UNI_R;
+	if (cpu_class_is_omap1() && !cpu_is_omap15xx() && nwires != 6) {
+		u32 l;
+
+		l = omap_readl(USB_TRANSCEIVER_CTRL);
+		l &= ~CONF_USB1_UNI_R;
+		omap_writel(l, USB_TRANSCEIVER_CTRL);
+	}
 	if (cpu_is_omap24xx())
 		omap2_usb_devconf_clear(1, USB_BIDIR_TLL);
 
@@ -316,8 +338,13 @@ static u32 __init omap_usb1_init(unsigned nwires)
 		syscon1 = 3;
 		omap_cfg_reg(USB1_VP);
 		omap_cfg_reg(USB1_VM);
-		if (!cpu_is_omap15xx())
-			USB_TRANSCEIVER_CTRL_REG |= CONF_USB1_UNI_R;
+		if (!cpu_is_omap15xx()) {
+			u32 l;
+
+			l = omap_readl(USB_TRANSCEIVER_CTRL);
+			l |= CONF_USB1_UNI_R;
+			omap_writel(l, USB_TRANSCEIVER_CTRL);
+		}
 		break;
 	default:
 bad:
@@ -340,8 +367,13 @@ static u32 __init omap_usb2_init(unsigned nwires, unsigned alt_pingroup)
 	if (alt_pingroup || nwires == 0)
 		return 0;
 
-	if (cpu_class_is_omap1() && !cpu_is_omap15xx() && nwires != 6)
-		USB_TRANSCEIVER_CTRL_REG &= ~CONF_USB2_UNI_R;
+	if (cpu_class_is_omap1() && !cpu_is_omap15xx() && nwires != 6) {
+		u32 l;
+
+		l = omap_readl(USB_TRANSCEIVER_CTRL);
+		l &= ~CONF_USB2_UNI_R;
+		omap_writel(l, USB_TRANSCEIVER_CTRL);
+	}
 
 	/* external transceiver */
 	if (cpu_is_omap15xx()) {
@@ -410,9 +442,13 @@ static u32 __init omap_usb2_init(unsigned nwires, unsigned alt_pingroup)
 			omap_cfg_reg(USB2_VP);
 			omap_cfg_reg(USB2_VM);
 		} else {
+			u32 l;
+
 			omap_cfg_reg(AA9_USB2_VP);
 			omap_cfg_reg(R9_USB2_VM);
-			USB_TRANSCEIVER_CTRL_REG |= CONF_USB2_UNI_R;
+			l = omap_readl(USB_TRANSCEIVER_CTRL);
+			l |= CONF_USB2_UNI_R;
+			omap_writel(l, USB_TRANSCEIVER_CTRL);
 		}
 		break;
 	default:
@@ -531,10 +567,6 @@ static struct platform_device otg_device = {
 
 /*-------------------------------------------------------------------------*/
 
-#define ULPD_CLOCK_CTRL_REG	__REG16(ULPD_CLOCK_CTRL)
-#define ULPD_SOFT_REQ_REG	__REG16(ULPD_SOFT_REQ)
-
-
 // FIXME correct answer depends on hmc_mode,
 // as does (on omap1) any nonzero value for config->otg port number
 #ifdef	CONFIG_USB_GADGET_OMAP
@@ -550,17 +582,17 @@ static struct platform_device otg_device = {
 void __init
 omap_otg_init(struct omap_usb_config *config)
 {
-	u32		syscon = OTG_SYSCON_1_REG & 0xffff;
+	u32		syscon;
 	int		status;
 	int		alt_pingroup = 0;
 
 	/* NOTE:  no bus or clock setup (yet?) */
 
-	syscon = OTG_SYSCON_1_REG & 0xffff;
+	syscon = omap_readl(OTG_SYSCON_1) & 0xffff;
 	if (!(syscon & OTG_RESET_DONE))
 		pr_debug("USB resets not complete?\n");
 
-	// OTG_IRQ_EN_REG = 0;
+	//omap_writew(0, OTG_IRQ_EN);
 
 	/* pin muxing and transceiver pinouts */
 	if (config->pins[0] > 2)	/* alt pingroup 2 */
@@ -568,8 +600,8 @@ omap_otg_init(struct omap_usb_config *config)
 	syscon |= omap_usb0_init(config->pins[0], is_usb0_device(config));
 	syscon |= omap_usb1_init(config->pins[1]);
 	syscon |= omap_usb2_init(config->pins[2], alt_pingroup);
-	pr_debug("OTG_SYSCON_1_REG = %08x\n", syscon);
-	OTG_SYSCON_1_REG = syscon;
+	pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
+	omap_writel(syscon, OTG_SYSCON_1);
 
 	syscon = config->hmc_mode;
 	syscon |= USBX_SYNCHRO | (4 << 16) /* B_ASE0_BRST */;
@@ -578,9 +610,10 @@ omap_otg_init(struct omap_usb_config *config)
 		syscon |= OTG_EN;
 #endif
 	if (cpu_class_is_omap1())
-		pr_debug("USB_TRANSCEIVER_CTRL_REG = %03x\n", USB_TRANSCEIVER_CTRL_REG);
-	pr_debug("OTG_SYSCON_2_REG = %08x\n", syscon);
-	OTG_SYSCON_2_REG = syscon;
+		pr_debug("USB_TRANSCEIVER_CTRL = %03x\n",
+			 omap_readl(USB_TRANSCEIVER_CTRL));
+	pr_debug("OTG_SYSCON_2 = %08x\n", omap_readl(OTG_SYSCON_2));
+	omap_writel(syscon, OTG_SYSCON_2);
 
 	printk("USB: hmc %d", config->hmc_mode);
 	if (!alt_pingroup)
@@ -597,12 +630,19 @@ omap_otg_init(struct omap_usb_config *config)
 	printk("\n");
 
 	if (cpu_class_is_omap1()) {
+		u16 w;
+
 		/* leave USB clocks/controllers off until needed */
-		ULPD_SOFT_REQ_REG &= ~SOFT_USB_CLK_REQ;
-		ULPD_CLOCK_CTRL_REG &= ~USB_MCLK_EN;
-		ULPD_CLOCK_CTRL_REG |= DIS_USB_PVCI_CLK;
+		w = omap_readw(ULPD_SOFT_REQ);
+		w &= ~SOFT_USB_CLK_REQ;
+		omap_writew(w, ULPD_SOFT_REQ);
+
+		w = omap_readw(ULPD_CLOCK_CTRL);
+		w &= ~USB_MCLK_EN;
+		w |= DIS_USB_PVCI_CLK;
+		omap_writew(w, ULPD_CLOCK_CTRL);
 	}
-	syscon = OTG_SYSCON_1_REG;
+	syscon = omap_readl(OTG_SYSCON_1);
 	syscon |= HST_IDLE_EN|DEV_IDLE_EN|OTG_IDLE_EN;
 
 #ifdef	CONFIG_USB_GADGET_OMAP
@@ -639,8 +679,8 @@ omap_otg_init(struct omap_usb_config *config)
 			pr_debug("can't register OTG device, %d\n", status);
 	}
 #endif
-	pr_debug("OTG_SYSCON_1_REG = %08x\n", syscon);
-	OTG_SYSCON_1_REG = syscon;
+	pr_debug("OTG_SYSCON_1 = %08x\n", omap_readl(OTG_SYSCON_1));
+	omap_writel(syscon, OTG_SYSCON_1);
 
 	status = 0;
 }
@@ -653,18 +693,19 @@ static inline void omap_otg_init(struct omap_usb_config *config) {}
 
 #ifdef	CONFIG_ARCH_OMAP15XX
 
-#define ULPD_DPLL_CTRL_REG	__REG16(ULPD_DPLL_CTRL)
+/* ULPD_DPLL_CTRL */
 #define DPLL_IOB		(1 << 13)
 #define DPLL_PLL_ENABLE		(1 << 4)
 #define DPLL_LOCK		(1 << 0)
 
-#define ULPD_APLL_CTRL_REG	__REG16(ULPD_APLL_CTRL)
+/* ULPD_APLL_CTRL */
 #define APLL_NDPLL_SWITCH	(1 << 0)
 
 
 static void __init omap_1510_usb_init(struct omap_usb_config *config)
 {
 	unsigned int val;
+	u16 w;
 
 	omap_usb0_init(config->pins[0], is_usb0_device(config));
 	omap_usb1_init(config->pins[1]);
@@ -685,12 +726,22 @@ static void __init omap_1510_usb_init(struct omap_usb_config *config)
 	printk("\n");
 
 	/* use DPLL for 48 MHz function clock */
-	pr_debug("APLL %04x DPLL %04x REQ %04x\n", ULPD_APLL_CTRL_REG,
-			ULPD_DPLL_CTRL_REG, ULPD_SOFT_REQ_REG);
-	ULPD_APLL_CTRL_REG &= ~APLL_NDPLL_SWITCH;
-	ULPD_DPLL_CTRL_REG |= DPLL_IOB | DPLL_PLL_ENABLE;
-	ULPD_SOFT_REQ_REG |= SOFT_UDC_REQ | SOFT_DPLL_REQ;
-	while (!(ULPD_DPLL_CTRL_REG & DPLL_LOCK))
+	pr_debug("APLL %04x DPLL %04x REQ %04x\n", omap_readw(ULPD_APLL_CTRL),
+			omap_readw(ULPD_DPLL_CTRL), omap_readw(ULPD_SOFT_REQ));
+
+	w = omap_readw(ULPD_APLL_CTRL);
+	w &= ~APLL_NDPLL_SWITCH;
+	omap_writew(w, ULPD_APLL_CTRL);
+
+	w = omap_readw(ULPD_DPLL_CTRL);
+	w |= DPLL_IOB | DPLL_PLL_ENABLE;
+	omap_writew(w, ULPD_DPLL_CTRL);
+
+	w = omap_readw(ULPD_SOFT_REQ);
+	w |= SOFT_UDC_REQ | SOFT_DPLL_REQ;
+	omap_writew(w, ULPD_SOFT_REQ);
+
+	while (!(omap_readw(ULPD_DPLL_CTRL) & DPLL_LOCK))
 		cpu_relax();
 
 #ifdef	CONFIG_USB_GADGET_OMAP
diff --git a/drivers/i2c/chips/isp1301_omap.c b/drivers/i2c/chips/isp1301_omap.c
index b1b45dddb17..03a33f1b9cd 100644
--- a/drivers/i2c/chips/isp1301_omap.c
+++ b/drivers/i2c/chips/isp1301_omap.c
@@ -72,7 +72,7 @@ struct isp1301 {
 };
 
 
-/* bits in OTG_CTRL_REG */
+/* bits in OTG_CTRL */
 
 #define	OTG_XCEIV_OUTPUTS \
 	(OTG_ASESSVLD|OTG_BSESSEND|OTG_BSESSVLD|OTG_VBUSVLD|OTG_ID)
@@ -186,8 +186,8 @@ isp1301_clear_bits(struct isp1301 *isp, u8 reg, u8 bits)
 
 /* operational registers */
 #define	ISP1301_MODE_CONTROL_1		0x04	/* u8 read, set, +1 clear */
-#	define	MC1_SPEED_REG		(1 << 0)
-#	define	MC1_SUSPEND_REG		(1 << 1)
+#	define	MC1_SPEED		(1 << 0)
+#	define	MC1_SUSPEND		(1 << 1)
 #	define	MC1_DAT_SE0		(1 << 2)
 #	define	MC1_TRANSPARENT		(1 << 3)
 #	define	MC1_BDIS_ACON_EN	(1 << 4)
@@ -274,7 +274,7 @@ static void power_down(struct isp1301 *isp)
 	isp->otg.state = OTG_STATE_UNDEFINED;
 
 	// isp1301_set_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
-	isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
+	isp1301_set_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 
 	isp1301_clear_bits(isp, ISP1301_OTG_CONTROL_1, OTG1_ID_PULLDOWN);
 	isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_DAT_SE0);
@@ -283,7 +283,7 @@ static void power_down(struct isp1301 *isp)
 static void power_up(struct isp1301 *isp)
 {
 	// isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_2, MC2_GLOBAL_PWR_DN);
-	isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND_REG);
+	isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1, MC1_SUSPEND);
 
 	/* do this only when cpu is driving transceiver,
 	 * so host won't see a low speed device...
@@ -360,6 +360,8 @@ isp1301_defer_work(struct isp1301 *isp, int work)
 /* called from irq handlers */
 static void a_idle(struct isp1301 *isp, const char *tag)
 {
+	u32 l;
+
 	if (isp->otg.state == OTG_STATE_A_IDLE)
 		return;
 
@@ -373,13 +375,17 @@ static void a_idle(struct isp1301 *isp, const char *tag)
 		gadget_suspend(isp);
 	}
 	isp->otg.state = OTG_STATE_A_IDLE;
-	isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
+	l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
+	omap_writel(l, OTG_CTRL);
+	isp->last_otg_ctrl = l;
 	pr_debug("  --> %s/%s\n", state_name(isp), tag);
 }
 
 /* called from irq handlers */
 static void b_idle(struct isp1301 *isp, const char *tag)
 {
+	u32 l;
+
 	if (isp->otg.state == OTG_STATE_B_IDLE)
 		return;
 
@@ -393,7 +399,9 @@ static void b_idle(struct isp1301 *isp, const char *tag)
 		gadget_suspend(isp);
 	}
 	isp->otg.state = OTG_STATE_B_IDLE;
-	isp->last_otg_ctrl = OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
+	l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
+	omap_writel(l, OTG_CTRL);
+	isp->last_otg_ctrl = l;
 	pr_debug("  --> %s/%s\n", state_name(isp), tag);
 }
 
@@ -406,7 +414,7 @@ dump_regs(struct isp1301 *isp, const char *label)
 	u8	src = isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE);
 
 	pr_debug("otg: %06x, %s %s, otg/%02x stat/%02x.%02x\n",
-		OTG_CTRL_REG, label, state_name(isp),
+		omap_readl(OTG_CTRL), label, state_name(isp),
 		ctrl, status, src);
 	/* mode control and irq enables don't change much */
 #endif
@@ -429,7 +437,7 @@ dump_regs(struct isp1301 *isp, const char *label)
 static void check_state(struct isp1301 *isp, const char *tag)
 {
 	enum usb_otg_state	state = OTG_STATE_UNDEFINED;
-	u8			fsm = OTG_TEST_REG & 0x0ff;
+	u8			fsm = omap_readw(OTG_TEST) & 0x0ff;
 	unsigned		extra = 0;
 
 	switch (fsm) {
@@ -494,7 +502,8 @@ static void check_state(struct isp1301 *isp, const char *tag)
 	if (isp->otg.state == state && !extra)
 		return;
 	pr_debug("otg: %s FSM %s/%02x, %s, %06x\n", tag,
-		state_string(state), fsm, state_name(isp), OTG_CTRL_REG);
+		state_string(state), fsm, state_name(isp),
+		omap_readl(OTG_CTRL));
 }
 
 #else
@@ -508,10 +517,11 @@ static void update_otg1(struct isp1301 *isp, u8 int_src)
 {
 	u32	otg_ctrl;
 
-	otg_ctrl = OTG_CTRL_REG
-			& OTG_CTRL_MASK
-			& ~OTG_XCEIV_INPUTS
-			& ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
+	otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
+	otg_ctrl &= ~OTG_XCEIV_INPUTS;
+	otg_ctrl &= ~(OTG_ID|OTG_ASESSVLD|OTG_VBUSVLD);
+
+
 	if (int_src & INTR_SESS_VLD)
 		otg_ctrl |= OTG_ASESSVLD;
 	else if (isp->otg.state == OTG_STATE_A_WAIT_VFALL) {
@@ -534,7 +544,7 @@ static void update_otg1(struct isp1301 *isp, u8 int_src)
 			return;
 		}
 	}
-	OTG_CTRL_REG = otg_ctrl;
+	omap_writel(otg_ctrl, OTG_CTRL);
 }
 
 /* outputs from ISP1301_OTG_STATUS */
@@ -542,15 +552,14 @@ static void update_otg2(struct isp1301 *isp, u8 otg_status)
 {
 	u32	otg_ctrl;
 
-	otg_ctrl = OTG_CTRL_REG
-			& OTG_CTRL_MASK
-			& ~OTG_XCEIV_INPUTS
-			& ~(OTG_BSESSVLD|OTG_BSESSEND);
+	otg_ctrl = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
+	otg_ctrl &= ~OTG_XCEIV_INPUTS;
+	otg_ctrl &= ~(OTG_BSESSVLD | OTG_BSESSEND);
 	if (otg_status & OTG_B_SESS_VLD)
 		otg_ctrl |= OTG_BSESSVLD;
 	else if (otg_status & OTG_B_SESS_END)
 		otg_ctrl |= OTG_BSESSEND;
-	OTG_CTRL_REG = otg_ctrl;
+	omap_writel(otg_ctrl, OTG_CTRL);
 }
 
 /* inputs going to ISP1301 */
@@ -559,7 +568,7 @@ static void otg_update_isp(struct isp1301 *isp)
 	u32	otg_ctrl, otg_change;
 	u8	set = OTG1_DM_PULLDOWN, clr = OTG1_DM_PULLUP;
 
-	otg_ctrl = OTG_CTRL_REG;
+	otg_ctrl = omap_readl(OTG_CTRL);
 	otg_change = otg_ctrl ^ isp->last_otg_ctrl;
 	isp->last_otg_ctrl = otg_ctrl;
 	otg_ctrl = otg_ctrl & OTG_XCEIV_INPUTS;
@@ -639,6 +648,8 @@ pulldown:
 
 	/* HNP switch to host or peripheral; and SRP */
 	if (otg_change & OTG_PULLUP) {
+		u32 l;
+
 		switch (isp->otg.state) {
 		case OTG_STATE_B_IDLE:
 			if (clr & OTG1_DP_PULLUP)
@@ -655,7 +666,9 @@ pulldown:
 		default:
 			break;
 		}
-		OTG_CTRL_REG |= OTG_PULLUP;
+		l = omap_readl(OTG_CTRL);
+		l |= OTG_PULLUP;
+		omap_writel(l, OTG_CTRL);
 	}
 
 	check_state(isp, __func__);
@@ -664,20 +677,20 @@ pulldown:
 
 static irqreturn_t omap_otg_irq(int irq, void *_isp)
 {
-	u16		otg_irq = OTG_IRQ_SRC_REG;
+	u16		otg_irq = omap_readw(OTG_IRQ_SRC);
 	u32		otg_ctrl;
 	int		ret = IRQ_NONE;
 	struct isp1301	*isp = _isp;
 
 	/* update ISP1301 transciever from OTG controller */
 	if (otg_irq & OPRT_CHG) {
-		OTG_IRQ_SRC_REG = OPRT_CHG;
+		omap_writew(OPRT_CHG, OTG_IRQ_SRC);
 		isp1301_defer_work(isp, WORK_UPDATE_ISP);
 		ret = IRQ_HANDLED;
 
 	/* SRP to become b_peripheral failed */
 	} else if (otg_irq & B_SRP_TMROUT) {
-		pr_debug("otg: B_SRP_TIMEOUT, %06x\n", OTG_CTRL_REG);
+		pr_debug("otg: B_SRP_TIMEOUT, %06x\n", omap_readl(OTG_CTRL));
 		notresponding(isp);
 
 		/* gadget drivers that care should monitor all kinds of
@@ -687,31 +700,31 @@ static irqreturn_t omap_otg_irq(int irq, void *_isp)
 		if (isp->otg.state == OTG_STATE_B_SRP_INIT)
 			b_idle(isp, "srp_timeout");
 
-		OTG_IRQ_SRC_REG = B_SRP_TMROUT;
+		omap_writew(B_SRP_TMROUT, OTG_IRQ_SRC);
 		ret = IRQ_HANDLED;
 
 	/* HNP to become b_host failed */
 	} else if (otg_irq & B_HNP_FAIL) {
 		pr_debug("otg: %s B_HNP_FAIL, %06x\n",
-				state_name(isp), OTG_CTRL_REG);
+				state_name(isp), omap_readl(OTG_CTRL));
 		notresponding(isp);
 
-		otg_ctrl = OTG_CTRL_REG;
+		otg_ctrl = omap_readl(OTG_CTRL);
 		otg_ctrl |= OTG_BUSDROP;
 		otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
-		OTG_CTRL_REG = otg_ctrl;
+		omap_writel(otg_ctrl, OTG_CTRL);
 
 		/* subset of b_peripheral()... */
 		isp->otg.state = OTG_STATE_B_PERIPHERAL;
 		pr_debug("  --> b_peripheral\n");
 
-		OTG_IRQ_SRC_REG = B_HNP_FAIL;
+		omap_writew(B_HNP_FAIL, OTG_IRQ_SRC);
 		ret = IRQ_HANDLED;
 
 	/* detect SRP from B-device ... */
 	} else if (otg_irq & A_SRP_DETECT) {
 		pr_debug("otg: %s SRP_DETECT, %06x\n",
-				state_name(isp), OTG_CTRL_REG);
+				state_name(isp), omap_readl(OTG_CTRL));
 
 		isp1301_defer_work(isp, WORK_UPDATE_OTG);
 		switch (isp->otg.state) {
@@ -719,49 +732,49 @@ static irqreturn_t omap_otg_irq(int irq, void *_isp)
 			if (!isp->otg.host)
 				break;
 			isp1301_defer_work(isp, WORK_HOST_RESUME);
-			otg_ctrl = OTG_CTRL_REG;
+			otg_ctrl = omap_readl(OTG_CTRL);
 			otg_ctrl |= OTG_A_BUSREQ;
 			otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 					& ~OTG_XCEIV_INPUTS
 					& OTG_CTRL_MASK;
-			OTG_CTRL_REG = otg_ctrl;
+			omap_writel(otg_ctrl, OTG_CTRL);
 			break;
 		default:
 			break;
 		}
 
-		OTG_IRQ_SRC_REG = A_SRP_DETECT;
+		omap_writew(A_SRP_DETECT, OTG_IRQ_SRC);
 		ret = IRQ_HANDLED;
 
 	/* timer expired:  T(a_wait_bcon) and maybe T(a_wait_vrise)
 	 * we don't track them separately
 	 */
 	} else if (otg_irq & A_REQ_TMROUT) {
-		otg_ctrl = OTG_CTRL_REG;
+		otg_ctrl = omap_readl(OTG_CTRL);
 		pr_info("otg: BCON_TMOUT from %s, %06x\n",
 				state_name(isp), otg_ctrl);
 		notresponding(isp);
 
 		otg_ctrl |= OTG_BUSDROP;
 		otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
-		OTG_CTRL_REG = otg_ctrl;
+		omap_writel(otg_ctrl, OTG_CTRL);
 		isp->otg.state = OTG_STATE_A_WAIT_VFALL;
 
-		OTG_IRQ_SRC_REG = A_REQ_TMROUT;
+		omap_writew(A_REQ_TMROUT, OTG_IRQ_SRC);
 		ret = IRQ_HANDLED;
 
 	/* A-supplied voltage fell too low; overcurrent */
 	} else if (otg_irq & A_VBUS_ERR) {
-		otg_ctrl = OTG_CTRL_REG;
+		otg_ctrl = omap_readl(OTG_CTRL);
 		printk(KERN_ERR "otg: %s, VBUS_ERR %04x ctrl %06x\n",
 			state_name(isp), otg_irq, otg_ctrl);
 
 		otg_ctrl |= OTG_BUSDROP;
 		otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
-		OTG_CTRL_REG = otg_ctrl;
+		omap_writel(otg_ctrl, OTG_CTRL);
 		isp->otg.state = OTG_STATE_A_VBUS_ERR;
 
-		OTG_IRQ_SRC_REG = A_VBUS_ERR;
+		omap_writew(A_VBUS_ERR, OTG_IRQ_SRC);
 		ret = IRQ_HANDLED;
 
 	/* switch driver; the transciever code activates it,
@@ -770,7 +783,7 @@ static irqreturn_t omap_otg_irq(int irq, void *_isp)
 	} else if (otg_irq & DRIVER_SWITCH) {
 		int	kick = 0;
 
-		otg_ctrl = OTG_CTRL_REG;
+		otg_ctrl = omap_readl(OTG_CTRL);
 		printk(KERN_NOTICE "otg: %s, SWITCH to %s, ctrl %06x\n",
 				state_name(isp),
 				(otg_ctrl & OTG_DRIVER_SEL)
@@ -793,7 +806,7 @@ static irqreturn_t omap_otg_irq(int irq, void *_isp)
 		} else {
 			if (!(otg_ctrl & OTG_ID)) {
 				otg_ctrl &= OTG_CTRL_MASK & ~OTG_XCEIV_INPUTS;
-				OTG_CTRL_REG = otg_ctrl | OTG_A_BUSREQ;
+				omap_writel(otg_ctrl | OTG_A_BUSREQ, OTG_CTRL);
 			}
 
 			if (isp->otg.host) {
@@ -818,7 +831,7 @@ static irqreturn_t omap_otg_irq(int irq, void *_isp)
 			}
 		}
 
-		OTG_IRQ_SRC_REG = DRIVER_SWITCH;
+		omap_writew(DRIVER_SWITCH, OTG_IRQ_SRC);
 		ret = IRQ_HANDLED;
 
 		if (kick)
@@ -834,12 +847,15 @@ static struct platform_device *otg_dev;
 
 static int otg_init(struct isp1301 *isp)
 {
+	u32 l;
+
 	if (!otg_dev)
 		return -ENODEV;
 
 	dump_regs(isp, __func__);
 	/* some of these values are board-specific... */
-	OTG_SYSCON_2_REG |= OTG_EN
+	l = omap_readl(OTG_SYSCON_2);
+	l |= OTG_EN
 		/* for B-device: */
 		| SRP_GPDATA		/* 9msec Bdev D+ pulse */
 		| SRP_GPDVBUS		/* discharge after VBUS pulse */
@@ -849,18 +865,22 @@ static int otg_init(struct isp1301 *isp)
 		| SRP_DPW		/* detect 167+ns SRP pulses */
 		| SRP_DATA | SRP_VBUS	/* accept both kinds of SRP pulse */
 		;
+	omap_writel(l, OTG_SYSCON_2);
 
 	update_otg1(isp, isp1301_get_u8(isp, ISP1301_INTERRUPT_SOURCE));
 	update_otg2(isp, isp1301_get_u8(isp, ISP1301_OTG_STATUS));
 
 	check_state(isp, __func__);
 	pr_debug("otg: %s, %s %06x\n",
-			state_name(isp), __func__, OTG_CTRL_REG);
+			state_name(isp), __func__, omap_readl(OTG_CTRL));
 
-	OTG_IRQ_EN_REG = DRIVER_SWITCH | OPRT_CHG
+	omap_writew(DRIVER_SWITCH | OPRT_CHG
 			| B_SRP_TMROUT | B_HNP_FAIL
-			| A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT;
-	OTG_SYSCON_2_REG |= OTG_EN;
+			| A_VBUS_ERR | A_SRP_DETECT | A_REQ_TMROUT, OTG_IRQ_EN);
+
+	l = omap_readl(OTG_SYSCON_2);
+	l |= OTG_EN;
+	omap_writel(l, OTG_SYSCON_2);
 
 	return 0;
 }
@@ -927,7 +947,11 @@ static void otg_unbind(struct isp1301 *isp)
 
 static void b_peripheral(struct isp1301 *isp)
 {
-	OTG_CTRL_REG = OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
+	u32 l;
+
+	l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
+	omap_writel(l, OTG_CTRL);
+
 	usb_gadget_vbus_connect(isp->otg.gadget);
 
 #ifdef	CONFIG_USB_OTG
@@ -999,6 +1023,8 @@ static void isp_update_otg(struct isp1301 *isp, u8 stat)
 			isp_bstat = 0;
 		}
 	} else {
+		u32 l;
+
 		/* if user unplugged mini-A end of cable,
 		 * don't bypass A_WAIT_VFALL.
 		 */
@@ -1019,8 +1045,9 @@ static void isp_update_otg(struct isp1301 *isp, u8 stat)
 				isp1301_clear_bits(isp, ISP1301_MODE_CONTROL_1,
 						MC1_BDIS_ACON_EN);
 				isp->otg.state = OTG_STATE_B_IDLE;
-				OTG_CTRL_REG &= OTG_CTRL_REG & OTG_CTRL_MASK
-						& ~OTG_CTRL_BITS;
+				l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
+				l &= ~OTG_CTRL_BITS;
+				omap_writel(l, OTG_CTRL);
 				break;
 			case OTG_STATE_B_IDLE:
 				break;
@@ -1046,7 +1073,8 @@ static void isp_update_otg(struct isp1301 *isp, u8 stat)
 			/* FALLTHROUGH */
 		case OTG_STATE_B_SRP_INIT:
 			b_idle(isp, __func__);
-			OTG_CTRL_REG &= OTG_CTRL_REG & OTG_XCEIV_OUTPUTS;
+			l = omap_readl(OTG_CTRL) & OTG_XCEIV_OUTPUTS;
+			omap_writel(l, OTG_CTRL);
 			/* FALLTHROUGH */
 		case OTG_STATE_B_IDLE:
 			if (isp->otg.gadget && (isp_bstat & OTG_B_SESS_VLD)) {
@@ -1130,11 +1158,11 @@ isp1301_work(struct work_struct *work)
 			case OTG_STATE_A_WAIT_VRISE:
 				isp->otg.state = OTG_STATE_A_HOST;
 				pr_debug("  --> a_host\n");
-				otg_ctrl = OTG_CTRL_REG;
+				otg_ctrl = omap_readl(OTG_CTRL);
 				otg_ctrl |= OTG_A_BUSREQ;
 				otg_ctrl &= ~(OTG_BUSDROP|OTG_B_BUSREQ)
 						& OTG_CTRL_MASK;
-				OTG_CTRL_REG = otg_ctrl;
+				omap_writel(otg_ctrl, OTG_CTRL);
 				break;
 			case OTG_STATE_B_WAIT_ACON:
 				isp->otg.state = OTG_STATE_B_HOST;
@@ -1274,7 +1302,7 @@ isp1301_set_host(struct otg_transceiver *otg, struct usb_bus *host)
 		return -ENODEV;
 
 	if (!host) {
-		OTG_IRQ_EN_REG = 0;
+		omap_writew(0, OTG_IRQ_EN);
 		power_down(isp);
 		isp->otg.host = 0;
 		return 0;
@@ -1325,12 +1353,13 @@ static int
 isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
 {
 	struct isp1301	*isp = container_of(otg, struct isp1301, otg);
+	u32 l;
 
 	if (!otg || isp != the_transceiver)
 		return -ENODEV;
 
 	if (!gadget) {
-		OTG_IRQ_EN_REG = 0;
+		omap_writew(0, OTG_IRQ_EN);
 		if (!isp->otg.default_a)
 			enable_vbus_draw(isp, 0);
 		usb_gadget_vbus_disconnect(isp->otg.gadget);
@@ -1351,9 +1380,11 @@ isp1301_set_peripheral(struct otg_transceiver *otg, struct usb_gadget *gadget)
 	isp->otg.gadget = gadget;
 	// FIXME update its refcount
 
-	OTG_CTRL_REG = (OTG_CTRL_REG & OTG_CTRL_MASK
-				& ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS))
-			| OTG_ID;
+	l = omap_readl(OTG_CTRL) & OTG_CTRL_MASK;
+	l &= ~(OTG_XCEIV_OUTPUTS|OTG_CTRL_BITS);
+	l |= OTG_ID;
+	omap_writel(l, OTG_CTRL);
+
 	power_up(isp);
 	isp->otg.state = OTG_STATE_B_IDLE;
 
@@ -1405,16 +1436,17 @@ isp1301_start_srp(struct otg_transceiver *dev)
 			|| isp->otg.state != OTG_STATE_B_IDLE)
 		return -ENODEV;
 
-	otg_ctrl = OTG_CTRL_REG;
+	otg_ctrl = omap_readl(OTG_CTRL);
 	if (!(otg_ctrl & OTG_BSESSEND))
 		return -EINVAL;
 
 	otg_ctrl |= OTG_B_BUSREQ;
 	otg_ctrl &= ~OTG_A_BUSREQ & OTG_CTRL_MASK;
-	OTG_CTRL_REG = otg_ctrl;
+	omap_writel(otg_ctrl, OTG_CTRL);
 	isp->otg.state = OTG_STATE_B_SRP_INIT;
 
-	pr_debug("otg: SRP, %s ... %06x\n", state_name(isp), OTG_CTRL_REG);
+	pr_debug("otg: SRP, %s ... %06x\n", state_name(isp),
+			omap_readl(OTG_CTRL));
 #ifdef	CONFIG_USB_OTG
 	check_state(isp, __func__);
 #endif
@@ -1426,6 +1458,7 @@ isp1301_start_hnp(struct otg_transceiver *dev)
 {
 #ifdef	CONFIG_USB_OTG
 	struct isp1301	*isp = container_of(dev, struct isp1301, otg);
+	u32 l;
 
 	if (!dev || isp != the_transceiver)
 		return -ENODEV;
@@ -1452,7 +1485,9 @@ isp1301_start_hnp(struct otg_transceiver *dev)
 #endif
 		/* caller must suspend then clear A_BUSREQ */
 		usb_gadget_vbus_connect(isp->otg.gadget);
-		OTG_CTRL_REG |= OTG_A_SETB_HNPEN;
+		l = omap_readl(OTG_CTRL);
+		l |= OTG_A_SETB_HNPEN;
+		omap_writel(l, OTG_CTRL);
 
 		break;
 	case OTG_STATE_A_PERIPHERAL:
@@ -1462,7 +1497,7 @@ isp1301_start_hnp(struct otg_transceiver *dev)
 		return -EILSEQ;
 	}
 	pr_debug("otg: HNP %s, %06x ...\n",
-		state_name(isp), OTG_CTRL_REG);
+		state_name(isp), omap_readl(OTG_CTRL));
 	check_state(isp, __func__);
 	return 0;
 #else
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index 86c029a8d99..03a7f49d207 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -135,13 +135,17 @@ static void use_ep(struct omap_ep *ep, u16 select)
 
 	if (ep->bEndpointAddress & USB_DIR_IN)
 		num |= UDC_EP_DIR;
-	UDC_EP_NUM_REG = num | select;
+	omap_writew(num | select, UDC_EP_NUM);
 	/* when select, MUST deselect later !! */
 }
 
 static inline void deselect_ep(void)
 {
-	UDC_EP_NUM_REG &= ~UDC_EP_SEL;
+	u16 w;
+
+	w = omap_readw(UDC_EP_NUM);
+	w &= ~UDC_EP_SEL;
+	omap_writew(w, UDC_EP_NUM);
 	/* 6 wait states before TX will happen */
 }
 
@@ -216,7 +220,7 @@ static int omap_ep_enable(struct usb_ep *_ep,
 	ep->has_dma = 0;
 	ep->lch = -1;
 	use_ep(ep, UDC_EP_SEL);
-	UDC_CTRL_REG = udc->clr_halt;
+	omap_writew(udc->clr_halt, UDC_CTRL);
 	ep->ackwait = 0;
 	deselect_ep();
 
@@ -232,7 +236,7 @@ static int omap_ep_enable(struct usb_ep *_ep,
 	if (desc->bmAttributes != USB_ENDPOINT_XFER_ISOC
 			&& !ep->has_dma
 			&& !(ep->bEndpointAddress & USB_DIR_IN)) {
-		UDC_CTRL_REG = UDC_SET_FIFO_EN;
+		omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 		ep->ackwait = 1 + ep->double_buf;
 	}
 
@@ -259,7 +263,7 @@ static int omap_ep_disable(struct usb_ep *_ep)
 	nuke (ep, -ESHUTDOWN);
 	ep->ep.maxpacket = ep->maxpacket;
 	ep->has_dma = 0;
-	UDC_CTRL_REG = UDC_SET_HALT;
+	omap_writew(UDC_SET_HALT, UDC_CTRL);
 	list_del_init(&ep->iso);
 	del_timer(&ep->timer);
 
@@ -360,13 +364,13 @@ write_packet(u8 *buf, struct omap_req *req, unsigned max)
 	if (likely((((int)buf) & 1) == 0)) {
 		wp = (u16 *)buf;
 		while (max >= 2) {
-			UDC_DATA_REG = *wp++;
+			omap_writew(*wp++, UDC_DATA);
 			max -= 2;
 		}
 		buf = (u8 *)wp;
 	}
 	while (max--)
-		*(volatile u8 *)&UDC_DATA_REG = *buf++;
+		omap_writeb(*buf++, UDC_DATA);
 	return len;
 }
 
@@ -385,13 +389,13 @@ static int write_fifo(struct omap_ep *ep, struct omap_req *req)
 	prefetch(buf);
 
 	/* PIO-IN isn't double buffered except for iso */
-	ep_stat = UDC_STAT_FLG_REG;
+	ep_stat = omap_readw(UDC_STAT_FLG);
 	if (ep_stat & UDC_FIFO_UNWRITABLE)
 		return 0;
 
 	count = ep->ep.maxpacket;
 	count = write_packet(buf, req, count);
-	UDC_CTRL_REG = UDC_SET_FIFO_EN;
+	omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 	ep->ackwait = 1;
 
 	/* last packet is often short (sometimes a zlp) */
@@ -425,13 +429,13 @@ read_packet(u8 *buf, struct omap_req *req, unsigned avail)
 	if (likely((((int)buf) & 1) == 0)) {
 		wp = (u16 *)buf;
 		while (avail >= 2) {
-			*wp++ = UDC_DATA_REG;
+			*wp++ = omap_readw(UDC_DATA);
 			avail -= 2;
 		}
 		buf = (u8 *)wp;
 	}
 	while (avail--)
-		*buf++ = *(volatile u8 *)&UDC_DATA_REG;
+		*buf++ = omap_readb(UDC_DATA);
 	return len;
 }
 
@@ -446,7 +450,7 @@ static int read_fifo(struct omap_ep *ep, struct omap_req *req)
 	prefetchw(buf);
 
 	for (;;) {
-		u16	ep_stat = UDC_STAT_FLG_REG;
+		u16	ep_stat = omap_readw(UDC_STAT_FLG);
 
 		is_last = 0;
 		if (ep_stat & FIFO_EMPTY) {
@@ -460,7 +464,7 @@ static int read_fifo(struct omap_ep *ep, struct omap_req *req)
 		if (ep_stat & UDC_FIFO_FULL)
 			avail = ep->ep.maxpacket;
 		else  {
-			avail = UDC_RXFSTAT_REG;
+			avail = omap_readw(UDC_RXFSTAT);
 			ep->fnf = ep->double_buf;
 		}
 		count = read_packet(buf, req, avail);
@@ -473,7 +477,7 @@ static int read_fifo(struct omap_ep *ep, struct omap_req *req)
 				req->req.status = -EOVERFLOW;
 				avail -= count;
 				while (avail--)
-					(void) *(volatile u8 *)&UDC_DATA_REG;
+					omap_readw(UDC_DATA);
 			}
 		} else if (req->req.length == req->req.actual)
 			is_last = 1;
@@ -535,7 +539,7 @@ static u16 dma_dest_len(struct omap_ep *ep, dma_addr_t start)
 
 static void next_in_dma(struct omap_ep *ep, struct omap_req *req)
 {
-	u16		txdma_ctrl;
+	u16		txdma_ctrl, w;
 	unsigned	length = req->req.length - req->req.actual;
 	const int	sync_mode = cpu_is_omap15xx()
 				? OMAP_DMA_SYNC_FRAME
@@ -567,13 +571,17 @@ static void next_in_dma(struct omap_ep *ep, struct omap_req *req)
 
 	omap_start_dma(ep->lch);
 	ep->dma_counter = omap_get_dma_src_pos(ep->lch);
-	UDC_DMA_IRQ_EN_REG |= UDC_TX_DONE_IE(ep->dma_channel);
-	UDC_TXDMA_REG(ep->dma_channel) = UDC_TXN_START | txdma_ctrl;
+	w = omap_readw(UDC_DMA_IRQ_EN);
+	w |= UDC_TX_DONE_IE(ep->dma_channel);
+	omap_writew(w, UDC_DMA_IRQ_EN);
+	omap_writew(UDC_TXN_START | txdma_ctrl, UDC_TXDMA(ep->dma_channel));
 	req->dma_bytes = length;
 }
 
 static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status)
 {
+	u16 w;
+
 	if (status == 0) {
 		req->req.actual += req->dma_bytes;
 
@@ -590,7 +598,9 @@ static void finish_in_dma(struct omap_ep *ep, struct omap_req *req, int status)
 
 	/* tx completion */
 	omap_stop_dma(ep->lch);
-	UDC_DMA_IRQ_EN_REG &= ~UDC_TX_DONE_IE(ep->dma_channel);
+	w = omap_readw(UDC_DMA_IRQ_EN);
+	w &= ~UDC_TX_DONE_IE(ep->dma_channel);
+	omap_writew(w, UDC_DMA_IRQ_EN);
 	done(ep, req, status);
 }
 
@@ -598,6 +608,7 @@ static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
 {
 	unsigned packets = req->req.length - req->req.actual;
 	int dma_trigger = 0;
+	u16 w;
 
 	if (cpu_is_omap24xx())
 		dma_trigger = OMAP24XX_DMA(USB_W2FC_RX0, ep->dma_channel);
@@ -626,10 +637,12 @@ static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
 		0, 0);
 	ep->dma_counter = omap_get_dma_dst_pos(ep->lch);
 
-	UDC_RXDMA_REG(ep->dma_channel) = UDC_RXN_STOP | (packets - 1);
-	UDC_DMA_IRQ_EN_REG |= UDC_RX_EOT_IE(ep->dma_channel);
-	UDC_EP_NUM_REG = (ep->bEndpointAddress & 0xf);
-	UDC_CTRL_REG = UDC_SET_FIFO_EN;
+	omap_writew(UDC_RXN_STOP | (packets - 1), UDC_RXDMA(ep->dma_channel));
+	w = omap_readw(UDC_DMA_IRQ_EN);
+	w |= UDC_RX_EOT_IE(ep->dma_channel);
+	omap_writew(w, UDC_DMA_IRQ_EN);
+	omap_writew(ep->bEndpointAddress & 0xf, UDC_EP_NUM);
+	omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 
 	omap_start_dma(ep->lch);
 }
@@ -637,7 +650,7 @@ static void next_out_dma(struct omap_ep *ep, struct omap_req *req)
 static void
 finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status, int one)
 {
-	u16	count;
+	u16	count, w;
 
 	if (status == 0)
 		ep->dma_counter = (u16) (req->req.dma + req->req.actual);
@@ -656,13 +669,15 @@ finish_out_dma(struct omap_ep *ep, struct omap_req *req, int status, int one)
 		return;
 
 	/* rx completion */
-	UDC_DMA_IRQ_EN_REG &= ~UDC_RX_EOT_IE(ep->dma_channel);
+	w = omap_readw(UDC_DMA_IRQ_EN);
+	w &= ~UDC_RX_EOT_IE(ep->dma_channel);
+	omap_writew(w, UDC_DMA_IRQ_EN);
 	done(ep, req, status);
 }
 
 static void dma_irq(struct omap_udc *udc, u16 irq_src)
 {
-	u16		dman_stat = UDC_DMAN_STAT_REG;
+	u16		dman_stat = omap_readw(UDC_DMAN_STAT);
 	struct omap_ep	*ep;
 	struct omap_req	*req;
 
@@ -676,7 +691,7 @@ static void dma_irq(struct omap_udc *udc, u16 irq_src)
 						struct omap_req, queue);
 			finish_in_dma(ep, req, 0);
 		}
-		UDC_IRQ_SRC_REG = UDC_TXN_DONE;
+		omap_writew(UDC_TXN_DONE, UDC_IRQ_SRC);
 
 		if (!list_empty (&ep->queue)) {
 			req = container_of(ep->queue.next,
@@ -695,7 +710,7 @@ static void dma_irq(struct omap_udc *udc, u16 irq_src)
 					struct omap_req, queue);
 			finish_out_dma(ep, req, 0, dman_stat & UDC_DMA_RX_SB);
 		}
-		UDC_IRQ_SRC_REG = UDC_RXN_EOT;
+		omap_writew(UDC_RXN_EOT, UDC_IRQ_SRC);
 
 		if (!list_empty (&ep->queue)) {
 			req = container_of(ep->queue.next,
@@ -709,7 +724,7 @@ static void dma_irq(struct omap_udc *udc, u16 irq_src)
 		ep->irqs++;
 		/* omap15xx does this unasked... */
 		VDBG("%s, RX_CNT irq?\n", ep->ep.name);
-		UDC_IRQ_SRC_REG = UDC_RXN_CNT;
+		omap_writew(UDC_RXN_CNT, UDC_IRQ_SRC);
 	}
 }
 
@@ -732,9 +747,9 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
 
 	is_in = ep->bEndpointAddress & USB_DIR_IN;
 	if (is_in)
-		reg = UDC_TXDMA_CFG_REG;
+		reg = omap_readw(UDC_TXDMA_CFG);
 	else
-		reg = UDC_RXDMA_CFG_REG;
+		reg = omap_readw(UDC_RXDMA_CFG);
 	reg |= UDC_DMA_REQ;		/* "pulse" activated */
 
 	ep->dma_channel = 0;
@@ -762,7 +777,7 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
 		status = omap_request_dma(dma_channel,
 			ep->ep.name, dma_error, ep, &ep->lch);
 		if (status == 0) {
-			UDC_TXDMA_CFG_REG = reg;
+			omap_writew(reg, UDC_TXDMA_CFG);
 			/* EMIFF or SDRC */
 			omap_set_dma_src_burst_mode(ep->lch,
 						OMAP_DMA_DATA_BURST_4);
@@ -771,7 +786,7 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
 			omap_set_dma_dest_params(ep->lch,
 				OMAP_DMA_PORT_TIPB,
 				OMAP_DMA_AMODE_CONSTANT,
-				(unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG),
+				(unsigned long) io_v2p(UDC_DATA_DMA),
 				0, 0);
 		}
 	} else {
@@ -783,12 +798,12 @@ static void dma_channel_claim(struct omap_ep *ep, unsigned channel)
 		status = omap_request_dma(dma_channel,
 			ep->ep.name, dma_error, ep, &ep->lch);
 		if (status == 0) {
-			UDC_RXDMA_CFG_REG = reg;
+			omap_writew(reg, UDC_RXDMA_CFG);
 			/* TIPB */
 			omap_set_dma_src_params(ep->lch,
 				OMAP_DMA_PORT_TIPB,
 				OMAP_DMA_AMODE_CONSTANT,
-				(unsigned long) io_v2p((u32)&UDC_DATA_DMA_REG),
+				(unsigned long) io_v2p(UDC_DATA_DMA),
 				0, 0);
 			/* EMIFF or SDRC */
 			omap_set_dma_dest_burst_mode(ep->lch,
@@ -830,7 +845,7 @@ just_restart:
 			(is_in ? write_fifo : read_fifo)(ep, req);
 			deselect_ep();
 			if (!is_in) {
-				UDC_CTRL_REG = UDC_SET_FIFO_EN;
+				omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 				ep->ackwait = 1 + ep->double_buf;
 			}
 			/* IN: 6 wait states before it'll tx */
@@ -864,23 +879,25 @@ static void dma_channel_release(struct omap_ep *ep)
 
 	/* wait till current packet DMA finishes, and fifo empties */
 	if (ep->bEndpointAddress & USB_DIR_IN) {
-		UDC_TXDMA_CFG_REG = (UDC_TXDMA_CFG_REG & ~mask) | UDC_DMA_REQ;
+		omap_writew((omap_readw(UDC_TXDMA_CFG) & ~mask) | UDC_DMA_REQ,
+					UDC_TXDMA_CFG);
 
 		if (req) {
 			finish_in_dma(ep, req, -ECONNRESET);
 
 			/* clear FIFO; hosts probably won't empty it */
 			use_ep(ep, UDC_EP_SEL);
-			UDC_CTRL_REG = UDC_CLR_EP;
+			omap_writew(UDC_CLR_EP, UDC_CTRL);
 			deselect_ep();
 		}
-		while (UDC_TXDMA_CFG_REG & mask)
+		while (omap_readw(UDC_TXDMA_CFG) & mask)
 			udelay(10);
 	} else {
-		UDC_RXDMA_CFG_REG = (UDC_RXDMA_CFG_REG & ~mask) | UDC_DMA_REQ;
+		omap_writew((omap_readw(UDC_RXDMA_CFG) & ~mask) | UDC_DMA_REQ,
+					UDC_RXDMA_CFG);
 
 		/* dma empties the fifo */
-		while (UDC_RXDMA_CFG_REG & mask)
+		while (omap_readw(UDC_RXDMA_CFG) & mask)
 			udelay(10);
 		if (req)
 			finish_out_dma(ep, req, -ECONNRESET, 0);
@@ -967,9 +984,13 @@ omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 	req->req.actual = 0;
 
 	/* maybe kickstart non-iso i/o queues */
-	if (is_iso)
-		UDC_IRQ_EN_REG |= UDC_SOF_IE;
-	else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) {
+	if (is_iso) {
+		u16 w;
+
+		w = omap_readw(UDC_IRQ_EN);
+		w |= UDC_SOF_IE;
+		omap_writew(w, UDC_IRQ_EN);
+	} else if (list_empty(&ep->queue) && !ep->stopped && !ep->ackwait) {
 		int	is_in;
 
 		if (ep->bEndpointAddress == 0) {
@@ -987,23 +1008,23 @@ omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 				 * requests to non-control endpoints
 				 */
 				if (udc->ep0_set_config) {
-					u16	irq_en = UDC_IRQ_EN_REG;
+					u16	irq_en = omap_readw(UDC_IRQ_EN);
 
 					irq_en |= UDC_DS_CHG_IE | UDC_EP0_IE;
 					if (!udc->ep0_reset_config)
 						irq_en |= UDC_EPN_RX_IE
 							| UDC_EPN_TX_IE;
-					UDC_IRQ_EN_REG = irq_en;
+					omap_writew(irq_en, UDC_IRQ_EN);
 				}
 
 				/* STATUS for zero length DATA stages is
 				 * always an IN ... even for IN transfers,
 				 * a weird case which seem to stall OMAP.
 				 */
-				UDC_EP_NUM_REG = (UDC_EP_SEL|UDC_EP_DIR);
-				UDC_CTRL_REG = UDC_CLR_EP;
-				UDC_CTRL_REG = UDC_SET_FIFO_EN;
-				UDC_EP_NUM_REG = UDC_EP_DIR;
+				omap_writew(UDC_EP_SEL | UDC_EP_DIR, UDC_EP_NUM);
+				omap_writew(UDC_CLR_EP, UDC_CTRL);
+				omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
+				omap_writew(UDC_EP_DIR, UDC_EP_NUM);
 
 				/* cleanup */
 				udc->ep0_pending = 0;
@@ -1012,11 +1033,11 @@ omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 
 			/* non-empty DATA stage */
 			} else if (is_in) {
-				UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
+				omap_writew(UDC_EP_SEL | UDC_EP_DIR, UDC_EP_NUM);
 			} else {
 				if (udc->ep0_setup)
 					goto irq_wait;
-				UDC_EP_NUM_REG = UDC_EP_SEL;
+				omap_writew(UDC_EP_SEL, UDC_EP_NUM);
 			}
 		} else {
 			is_in = ep->bEndpointAddress & USB_DIR_IN;
@@ -1032,7 +1053,7 @@ omap_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 				req = NULL;
 			deselect_ep();
 			if (!is_in) {
-				UDC_CTRL_REG = UDC_SET_FIFO_EN;
+				omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 				ep->ackwait = 1 + ep->double_buf;
 			}
 			/* IN: 6 wait states before it'll tx */
@@ -1100,9 +1121,9 @@ static int omap_ep_set_halt(struct usb_ep *_ep, int value)
 		else if (value) {
 			if (ep->udc->ep0_set_config) {
 				WARN("error changing config?\n");
-				UDC_SYSCON2_REG = UDC_CLR_CFG;
+				omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
 			}
-			UDC_SYSCON2_REG = UDC_STALL_CMD;
+			omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
 			ep->udc->ep0_pending = 0;
 			status = 0;
 		} else /* NOP */
@@ -1129,8 +1150,8 @@ static int omap_ep_set_halt(struct usb_ep *_ep, int value)
 				channel = 0;
 
 			use_ep(ep, UDC_EP_SEL);
-			if (UDC_STAT_FLG_REG & UDC_NON_ISO_FIFO_EMPTY) {
-				UDC_CTRL_REG = UDC_SET_HALT;
+			if (omap_readw(UDC_STAT_FLG) & UDC_NON_ISO_FIFO_EMPTY) {
+				omap_writew(UDC_SET_HALT, UDC_CTRL);
 				status = 0;
 			} else
 				status = -EAGAIN;
@@ -1140,10 +1161,10 @@ static int omap_ep_set_halt(struct usb_ep *_ep, int value)
 				dma_channel_claim(ep, channel);
 		} else {
 			use_ep(ep, 0);
-			UDC_CTRL_REG = ep->udc->clr_halt;
+			omap_writew(ep->udc->clr_halt, UDC_CTRL);
 			ep->ackwait = 0;
 			if (!(ep->bEndpointAddress & USB_DIR_IN)) {
-				UDC_CTRL_REG = UDC_SET_FIFO_EN;
+				omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 				ep->ackwait = 1 + ep->double_buf;
 			}
 		}
@@ -1175,7 +1196,7 @@ static struct usb_ep_ops omap_ep_ops = {
 
 static int omap_get_frame(struct usb_gadget *gadget)
 {
-	u16	sof = UDC_SOF_REG;
+	u16	sof = omap_readw(UDC_SOF);
 	return (sof & UDC_TS_OK) ? (sof & UDC_TS) : -EL2NSYNC;
 }
 
@@ -1194,7 +1215,7 @@ static int omap_wakeup(struct usb_gadget *gadget)
 		 */
 		if (udc->devstat & (UDC_B_HNP_ENABLE|UDC_R_WK_OK)) {
 			DBG("remote wakeup...\n");
-			UDC_SYSCON2_REG = UDC_RMT_WKP;
+			omap_writew(UDC_RMT_WKP, UDC_SYSCON2);
 			retval = 0;
 		}
 
@@ -1217,12 +1238,12 @@ omap_set_selfpowered(struct usb_gadget *gadget, int is_selfpowered)
 
 	udc = container_of(gadget, struct omap_udc, gadget);
 	spin_lock_irqsave(&udc->lock, flags);
-	syscon1 = UDC_SYSCON1_REG;
+	syscon1 = omap_readw(UDC_SYSCON1);
 	if (is_selfpowered)
 		syscon1 |= UDC_SELF_PWR;
 	else
 		syscon1 &= ~UDC_SELF_PWR;
-	UDC_SYSCON1_REG = syscon1;
+	omap_writew(syscon1, UDC_SYSCON1);
 	spin_unlock_irqrestore(&udc->lock, flags);
 
 	return 0;
@@ -1235,18 +1256,36 @@ static int can_pullup(struct omap_udc *udc)
 
 static void pullup_enable(struct omap_udc *udc)
 {
-	UDC_SYSCON1_REG |= UDC_PULLUP_EN;
-	if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx())
-		OTG_CTRL_REG |= OTG_BSESSVLD;
-	UDC_IRQ_EN_REG = UDC_DS_CHG_IE;
+	u16 w;
+
+	w = omap_readw(UDC_SYSCON1);
+	w |= UDC_PULLUP_EN;
+	omap_writew(w, UDC_SYSCON1);
+	if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
+		u32 l;
+
+		l = omap_readl(OTG_CTRL);
+		l |= OTG_BSESSVLD;
+		omap_writel(l, OTG_CTRL);
+	}
+	omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
 }
 
 static void pullup_disable(struct omap_udc *udc)
 {
-	if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx())
-		OTG_CTRL_REG &= ~OTG_BSESSVLD;
-	UDC_IRQ_EN_REG = UDC_DS_CHG_IE;
-	UDC_SYSCON1_REG &= ~UDC_PULLUP_EN;
+	u16 w;
+
+	if (!gadget_is_otg(&udc->gadget) && !cpu_is_omap15xx()) {
+		u32 l;
+
+		l = omap_readl(OTG_CTRL);
+		l &= ~OTG_BSESSVLD;
+		omap_writel(l, OTG_CTRL);
+	}
+	omap_writew(UDC_DS_CHG_IE, UDC_IRQ_EN);
+	w = omap_readw(UDC_SYSCON1);
+	w &= ~UDC_PULLUP_EN;
+	omap_writew(w, UDC_SYSCON1);
 }
 
 static struct omap_udc *udc;
@@ -1274,6 +1313,7 @@ static int omap_vbus_session(struct usb_gadget *gadget, int is_active)
 {
 	struct omap_udc	*udc;
 	unsigned long	flags;
+	u32 l;
 
 	udc = container_of(gadget, struct omap_udc, gadget);
 	spin_lock_irqsave(&udc->lock, flags);
@@ -1281,10 +1321,12 @@ static int omap_vbus_session(struct usb_gadget *gadget, int is_active)
 	udc->vbus_active = (is_active != 0);
 	if (cpu_is_omap15xx()) {
 		/* "software" detect, ignored if !VBUS_MODE_1510 */
+		l = omap_readl(FUNC_MUX_CTRL_0);
 		if (is_active)
-			FUNC_MUX_CTRL_0_REG |= VBUS_CTRL_1510;
+			l |= VBUS_CTRL_1510;
 		else
-			FUNC_MUX_CTRL_0_REG &= ~VBUS_CTRL_1510;
+			l &= ~VBUS_CTRL_1510;
+		omap_writel(l, FUNC_MUX_CTRL_0);
 	}
 	if (udc->dc_clk != NULL && is_active) {
 		if (!udc->clk_requested) {
@@ -1354,9 +1396,9 @@ static void nuke(struct omap_ep *ep, int status)
 		dma_channel_release(ep);
 
 	use_ep(ep, 0);
-	UDC_CTRL_REG = UDC_CLR_EP;
+	omap_writew(UDC_CLR_EP, UDC_CTRL);
 	if (ep->bEndpointAddress && ep->bmAttributes != USB_ENDPOINT_XFER_ISOC)
-		UDC_CTRL_REG = UDC_SET_HALT;
+		omap_writew(UDC_SET_HALT, UDC_CTRL);
 
 	while (!list_empty(&ep->queue)) {
 		req = list_entry(ep->queue.next, struct omap_req, queue);
@@ -1384,8 +1426,8 @@ static void update_otg(struct omap_udc *udc)
 	if (!gadget_is_otg(&udc->gadget))
 		return;
 
-	if (OTG_CTRL_REG & OTG_ID)
-		devstat = UDC_DEVSTAT_REG;
+	if (omap_readl(OTG_CTRL) & OTG_ID)
+		devstat = omap_readw(UDC_DEVSTAT);
 	else
 		devstat = 0;
 
@@ -1396,9 +1438,14 @@ static void update_otg(struct omap_udc *udc)
 	/* Enable HNP early, avoiding races on suspend irq path.
 	 * ASSUMES OTG state machine B_BUS_REQ input is true.
 	 */
-	if (udc->gadget.b_hnp_enable)
-		OTG_CTRL_REG = (OTG_CTRL_REG | OTG_B_HNPEN | OTG_B_BUSREQ)
-				& ~OTG_PULLUP;
+	if (udc->gadget.b_hnp_enable) {
+		u32 l;
+
+		l = omap_readl(OTG_CTRL);
+		l |= OTG_B_HNPEN | OTG_B_BUSREQ;
+		l &= ~OTG_PULLUP;
+		omap_writel(l, OTG_CTRL);
+	}
 }
 
 static void ep0_irq(struct omap_udc *udc, u16 irq_src)
@@ -1416,7 +1463,7 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
 
 		nuke(ep0, 0);
 		if (ack) {
-			UDC_IRQ_SRC_REG = ack;
+			omap_writew(ack, UDC_IRQ_SRC);
 			irq_src = UDC_SETUP;
 		}
 	}
@@ -1436,9 +1483,9 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
 	if (irq_src & UDC_EP0_TX) {
 		int	stat;
 
-		UDC_IRQ_SRC_REG = UDC_EP0_TX;
-		UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
-		stat = UDC_STAT_FLG_REG;
+		omap_writew(UDC_EP0_TX, UDC_IRQ_SRC);
+		omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
+		stat = omap_readw(UDC_STAT_FLG);
 		if (stat & UDC_ACK) {
 			if (udc->ep0_in) {
 				/* write next IN packet from response,
@@ -1446,26 +1493,26 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
 				 */
 				if (req)
 					stat = write_fifo(ep0, req);
-				UDC_EP_NUM_REG = UDC_EP_DIR;
+				omap_writew(UDC_EP_DIR, UDC_EP_NUM);
 				if (!req && udc->ep0_pending) {
-					UDC_EP_NUM_REG = UDC_EP_SEL;
-					UDC_CTRL_REG = UDC_CLR_EP;
-					UDC_CTRL_REG = UDC_SET_FIFO_EN;
-					UDC_EP_NUM_REG = 0;
+					omap_writew(UDC_EP_SEL, UDC_EP_NUM);
+					omap_writew(UDC_CLR_EP, UDC_CTRL);
+					omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
+					omap_writew(0, UDC_EP_NUM);
 					udc->ep0_pending = 0;
 				} /* else:  6 wait states before it'll tx */
 			} else {
 				/* ack status stage of OUT transfer */
-				UDC_EP_NUM_REG = UDC_EP_DIR;
+				omap_writew(UDC_EP_DIR, UDC_EP_NUM);
 				if (req)
 					done(ep0, req, 0);
 			}
 			req = NULL;
 		} else if (stat & UDC_STALL) {
-			UDC_CTRL_REG = UDC_CLR_HALT;
-			UDC_EP_NUM_REG = UDC_EP_DIR;
+			omap_writew(UDC_CLR_HALT, UDC_CTRL);
+			omap_writew(UDC_EP_DIR, UDC_EP_NUM);
 		} else {
-			UDC_EP_NUM_REG = UDC_EP_DIR;
+			omap_writew(UDC_EP_DIR, UDC_EP_NUM);
 		}
 	}
 
@@ -1473,9 +1520,9 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
 	if (irq_src & UDC_EP0_RX) {
 		int	stat;
 
-		UDC_IRQ_SRC_REG = UDC_EP0_RX;
-		UDC_EP_NUM_REG = UDC_EP_SEL;
-		stat = UDC_STAT_FLG_REG;
+		omap_writew(UDC_EP0_RX, UDC_IRQ_SRC);
+		omap_writew(UDC_EP_SEL, UDC_EP_NUM);
+		stat = omap_readw(UDC_STAT_FLG);
 		if (stat & UDC_ACK) {
 			if (!udc->ep0_in) {
 				stat = 0;
@@ -1483,34 +1530,35 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
 				 * reactiviting the fifo; stall on errors.
 				 */
 				if (!req || (stat = read_fifo(ep0, req)) < 0) {
-					UDC_SYSCON2_REG = UDC_STALL_CMD;
+					omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
 					udc->ep0_pending = 0;
 					stat = 0;
 				} else if (stat == 0)
-					UDC_CTRL_REG = UDC_SET_FIFO_EN;
-				UDC_EP_NUM_REG = 0;
+					omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
+				omap_writew(0, UDC_EP_NUM);
 
 				/* activate status stage */
 				if (stat == 1) {
 					done(ep0, req, 0);
 					/* that may have STALLed ep0... */
-					UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
-					UDC_CTRL_REG = UDC_CLR_EP;
-					UDC_CTRL_REG = UDC_SET_FIFO_EN;
-					UDC_EP_NUM_REG = UDC_EP_DIR;
+					omap_writew(UDC_EP_SEL | UDC_EP_DIR,
+							UDC_EP_NUM);
+					omap_writew(UDC_CLR_EP, UDC_CTRL);
+					omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
+					omap_writew(UDC_EP_DIR, UDC_EP_NUM);
 					udc->ep0_pending = 0;
 				}
 			} else {
 				/* ack status stage of IN transfer */
-				UDC_EP_NUM_REG = 0;
+				omap_writew(0, UDC_EP_NUM);
 				if (req)
 					done(ep0, req, 0);
 			}
 		} else if (stat & UDC_STALL) {
-			UDC_CTRL_REG = UDC_CLR_HALT;
-			UDC_EP_NUM_REG = 0;
+			omap_writew(UDC_CLR_HALT, UDC_CTRL);
+			omap_writew(0, UDC_EP_NUM);
 		} else {
-			UDC_EP_NUM_REG = 0;
+			omap_writew(0, UDC_EP_NUM);
 		}
 	}
 
@@ -1525,14 +1573,14 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
 
 		/* read the (latest) SETUP message */
 		do {
-			UDC_EP_NUM_REG = UDC_SETUP_SEL;
+			omap_writew(UDC_SETUP_SEL, UDC_EP_NUM);
 			/* two bytes at a time */
-			u.word[0] = UDC_DATA_REG;
-			u.word[1] = UDC_DATA_REG;
-			u.word[2] = UDC_DATA_REG;
-			u.word[3] = UDC_DATA_REG;
-			UDC_EP_NUM_REG = 0;
-		} while (UDC_IRQ_SRC_REG & UDC_SETUP);
+			u.word[0] = omap_readw(UDC_DATA);
+			u.word[1] = omap_readw(UDC_DATA);
+			u.word[2] = omap_readw(UDC_DATA);
+			u.word[3] = omap_readw(UDC_DATA);
+			omap_writew(0, UDC_EP_NUM);
+		} while (omap_readw(UDC_IRQ_SRC) & UDC_SETUP);
 
 #define	w_value		le16_to_cpu(u.r.wValue)
 #define	w_index		le16_to_cpu(u.r.wIndex)
@@ -1563,9 +1611,9 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
 			 * later if it fails the request.
 			 */
 			if (udc->ep0_reset_config)
-				UDC_SYSCON2_REG = UDC_CLR_CFG;
+				omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
 			else
-				UDC_SYSCON2_REG = UDC_DEV_CFG;
+				omap_writew(UDC_DEV_CFG, UDC_SYSCON2);
 			update_otg(udc);
 			goto delegate;
 		case USB_REQ_CLEAR_FEATURE:
@@ -1583,10 +1631,10 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
 						|| !ep->desc)
 					goto do_stall;
 				use_ep(ep, 0);
-				UDC_CTRL_REG = udc->clr_halt;
+				omap_writew(udc->clr_halt, UDC_CTRL);
 				ep->ackwait = 0;
 				if (!(ep->bEndpointAddress & USB_DIR_IN)) {
-					UDC_CTRL_REG = UDC_SET_FIFO_EN;
+					omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 					ep->ackwait = 1 + ep->double_buf;
 				}
 				/* NOTE:  assumes the host behaves sanely,
@@ -1619,15 +1667,15 @@ static void ep0_irq(struct omap_udc *udc, u16 irq_src)
 			}
 			use_ep(ep, 0);
 			/* can't halt if fifo isn't empty... */
-			UDC_CTRL_REG = UDC_CLR_EP;
-			UDC_CTRL_REG = UDC_SET_HALT;
+			omap_writew(UDC_CLR_EP, UDC_CTRL);
+			omap_writew(UDC_SET_HALT, UDC_CTRL);
 			VDBG("%s halted by host\n", ep->name);
 ep0out_status_stage:
 			status = 0;
-			UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
-			UDC_CTRL_REG = UDC_CLR_EP;
-			UDC_CTRL_REG = UDC_SET_FIFO_EN;
-			UDC_EP_NUM_REG = UDC_EP_DIR;
+			omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
+			omap_writew(UDC_CLR_EP, UDC_CTRL);
+			omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
+			omap_writew(UDC_EP_DIR, UDC_EP_NUM);
 			udc->ep0_pending = 0;
 			break;
 		case USB_REQ_GET_STATUS:
@@ -1664,10 +1712,10 @@ intf_status:
 
 zero_status:
 			/* return two zero bytes */
-			UDC_EP_NUM_REG = UDC_EP_SEL|UDC_EP_DIR;
-			UDC_DATA_REG = 0;
-			UDC_CTRL_REG = UDC_SET_FIFO_EN;
-			UDC_EP_NUM_REG = UDC_EP_DIR;
+			omap_writew(UDC_EP_SEL|UDC_EP_DIR, UDC_EP_NUM);
+			omap_writew(0, UDC_DATA);
+			omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
+			omap_writew(UDC_EP_DIR, UDC_EP_NUM);
 			status = 0;
 			VDBG("GET_STATUS, interface %d\n", w_index);
 			/* next, status stage */
@@ -1676,8 +1724,8 @@ zero_status:
 delegate:
 			/* activate the ep0out fifo right away */
 			if (!udc->ep0_in && w_length) {
-				UDC_EP_NUM_REG = 0;
-				UDC_CTRL_REG = UDC_SET_FIFO_EN;
+				omap_writew(0, UDC_EP_NUM);
+				omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 			}
 
 			/* gadget drivers see class/vendor specific requests,
@@ -1718,9 +1766,9 @@ do_stall:
 				if (udc->ep0_reset_config)
 					WARN("error resetting config?\n");
 				else
-					UDC_SYSCON2_REG = UDC_CLR_CFG;
+					omap_writew(UDC_CLR_CFG, UDC_SYSCON2);
 			}
-			UDC_SYSCON2_REG = UDC_STALL_CMD;
+			omap_writew(UDC_STALL_CMD, UDC_SYSCON2);
 			udc->ep0_pending = 0;
 		}
 	}
@@ -1734,7 +1782,7 @@ static void devstate_irq(struct omap_udc *udc, u16 irq_src)
 {
 	u16	devstat, change;
 
-	devstat = UDC_DEVSTAT_REG;
+	devstat = omap_readw(UDC_DEVSTAT);
 	change = devstat ^ udc->devstat;
 	udc->devstat = devstat;
 
@@ -1774,7 +1822,8 @@ static void devstate_irq(struct omap_udc *udc, u16 irq_src)
 				INFO("USB reset done, gadget %s\n",
 					udc->driver->driver.name);
 				/* ep0 traffic is legal from now on */
-				UDC_IRQ_EN_REG = UDC_DS_CHG_IE | UDC_EP0_IE;
+				omap_writew(UDC_DS_CHG_IE | UDC_EP0_IE,
+						UDC_IRQ_EN);
 			}
 			change &= ~UDC_USB_RESET;
 		}
@@ -1818,7 +1867,7 @@ static void devstate_irq(struct omap_udc *udc, u16 irq_src)
 		VDBG("devstat %03x, ignore change %03x\n",
 			devstat,  change);
 
-	UDC_IRQ_SRC_REG = UDC_DS_CHG;
+	omap_writew(UDC_DS_CHG, UDC_IRQ_SRC);
 }
 
 static irqreturn_t omap_udc_irq(int irq, void *_udc)
@@ -1829,7 +1878,7 @@ static irqreturn_t omap_udc_irq(int irq, void *_udc)
 	unsigned long	flags;
 
 	spin_lock_irqsave(&udc->lock, flags);
-	irq_src = UDC_IRQ_SRC_REG;
+	irq_src = omap_readw(UDC_IRQ_SRC);
 
 	/* Device state change (usb ch9 stuff) */
 	if (irq_src & UDC_DS_CHG) {
@@ -1852,7 +1901,7 @@ static irqreturn_t omap_udc_irq(int irq, void *_udc)
 		irq_src &= ~(UDC_TXN_DONE|UDC_RXN_CNT|UDC_RXN_EOT);
 	}
 
-	irq_src &= ~(UDC_SOF|UDC_EPN_TX|UDC_EPN_RX);
+	irq_src &= ~(UDC_IRQ_SOF | UDC_EPN_TX|UDC_EPN_RX);
 	if (irq_src)
 		DBG("udc_irq, unhandled %03x\n", irq_src);
 	spin_unlock_irqrestore(&udc->lock, flags);
@@ -1873,7 +1922,7 @@ static void pio_out_timer(unsigned long _ep)
 	spin_lock_irqsave(&ep->udc->lock, flags);
 	if (!list_empty(&ep->queue) && ep->ackwait) {
 		use_ep(ep, UDC_EP_SEL);
-		stat_flg = UDC_STAT_FLG_REG;
+		stat_flg = omap_readw(UDC_STAT_FLG);
 
 		if ((stat_flg & UDC_ACK) && (!(stat_flg & UDC_FIFO_EN)
 				|| (ep->double_buf && HALF_FULL(stat_flg)))) {
@@ -1883,8 +1932,8 @@ static void pio_out_timer(unsigned long _ep)
 			req = container_of(ep->queue.next,
 					struct omap_req, queue);
 			(void) read_fifo(ep, req);
-			UDC_EP_NUM_REG = ep->bEndpointAddress;
-			UDC_CTRL_REG = UDC_SET_FIFO_EN;
+			omap_writew(ep->bEndpointAddress, UDC_EP_NUM);
+			omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 			ep->ackwait = 1 + ep->double_buf;
 		} else
 			deselect_ep();
@@ -1904,20 +1953,20 @@ static irqreturn_t omap_udc_pio_irq(int irq, void *_dev)
 	unsigned long	flags;
 
 	spin_lock_irqsave(&udc->lock, flags);
-	epn_stat = UDC_EPN_STAT_REG;
-	irq_src = UDC_IRQ_SRC_REG;
+	epn_stat = omap_readw(UDC_EPN_STAT);
+	irq_src = omap_readw(UDC_IRQ_SRC);
 
 	/* handle OUT first, to avoid some wasteful NAKs */
 	if (irq_src & UDC_EPN_RX) {
 		epnum = (epn_stat >> 8) & 0x0f;
-		UDC_IRQ_SRC_REG = UDC_EPN_RX;
+		omap_writew(UDC_EPN_RX, UDC_IRQ_SRC);
 		status = IRQ_HANDLED;
 		ep = &udc->ep[epnum];
 		ep->irqs++;
 
-		UDC_EP_NUM_REG = epnum | UDC_EP_SEL;
+		omap_writew(epnum | UDC_EP_SEL, UDC_EP_NUM);
 		ep->fnf = 0;
-		if ((UDC_STAT_FLG_REG & UDC_ACK)) {
+		if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
 			ep->ackwait--;
 			if (!list_empty(&ep->queue)) {
 				int stat;
@@ -1929,15 +1978,15 @@ static irqreturn_t omap_udc_pio_irq(int irq, void *_dev)
 			}
 		}
 		/* min 6 clock delay before clearing EP_SEL ... */
-		epn_stat = UDC_EPN_STAT_REG;
-		epn_stat = UDC_EPN_STAT_REG;
-		UDC_EP_NUM_REG = epnum;
+		epn_stat = omap_readw(UDC_EPN_STAT);
+		epn_stat = omap_readw(UDC_EPN_STAT);
+		omap_writew(epnum, UDC_EP_NUM);
 
 		/* enabling fifo _after_ clearing ACK, contrary to docs,
 		 * reduces lossage; timer still needed though (sigh).
 		 */
 		if (ep->fnf) {
-			UDC_CTRL_REG = UDC_SET_FIFO_EN;
+			omap_writew(UDC_SET_FIFO_EN, UDC_CTRL);
 			ep->ackwait = 1 + ep->double_buf;
 		}
 		mod_timer(&ep->timer, PIO_OUT_TIMEOUT);
@@ -1946,13 +1995,13 @@ static irqreturn_t omap_udc_pio_irq(int irq, void *_dev)
 	/* then IN transfers */
 	else if (irq_src & UDC_EPN_TX) {
 		epnum = epn_stat & 0x0f;
-		UDC_IRQ_SRC_REG = UDC_EPN_TX;
+		omap_writew(UDC_EPN_TX, UDC_IRQ_SRC);
 		status = IRQ_HANDLED;
 		ep = &udc->ep[16 + epnum];
 		ep->irqs++;
 
-		UDC_EP_NUM_REG = epnum | UDC_EP_DIR | UDC_EP_SEL;
-		if ((UDC_STAT_FLG_REG & UDC_ACK)) {
+		omap_writew(epnum | UDC_EP_DIR | UDC_EP_SEL, UDC_EP_NUM);
+		if (omap_readw(UDC_STAT_FLG) & UDC_ACK) {
 			ep->ackwait = 0;
 			if (!list_empty(&ep->queue)) {
 				req = container_of(ep->queue.next,
@@ -1961,9 +2010,9 @@ static irqreturn_t omap_udc_pio_irq(int irq, void *_dev)
 			}
 		}
 		/* min 6 clock delay before clearing EP_SEL ... */
-		epn_stat = UDC_EPN_STAT_REG;
-		epn_stat = UDC_EPN_STAT_REG;
-		UDC_EP_NUM_REG = epnum | UDC_EP_DIR;
+		epn_stat = omap_readw(UDC_EPN_STAT);
+		epn_stat = omap_readw(UDC_EPN_STAT);
+		omap_writew(epnum | UDC_EP_DIR, UDC_EP_NUM);
 		/* then 6 clocks before it'd tx */
 	}
 
@@ -1991,7 +2040,7 @@ static irqreturn_t omap_udc_iso_irq(int irq, void *_dev)
 		req = list_entry(ep->queue.next, struct omap_req, queue);
 
 		use_ep(ep, UDC_EP_SEL);
-		stat = UDC_STAT_FLG_REG;
+		stat = omap_readw(UDC_STAT_FLG);
 
 		/* NOTE: like the other controller drivers, this isn't
 		 * currently reporting lost or damaged frames.
@@ -2023,9 +2072,14 @@ static irqreturn_t omap_udc_iso_irq(int irq, void *_dev)
 		if (!list_empty(&ep->queue))
 			pending = 1;
 	}
-	if (!pending)
-		UDC_IRQ_EN_REG &= ~UDC_SOF_IE;
-	UDC_IRQ_SRC_REG = UDC_SOF;
+	if (!pending) {
+		u16 w;
+
+		w = omap_readw(UDC_IRQ_EN);
+		w &= ~UDC_SOF_IE;
+		omap_writew(w, UDC_IRQ_EN);
+	}
+	omap_writew(UDC_IRQ_SOF, UDC_IRQ_SRC);
 
 	spin_unlock_irqrestore(&udc->lock, flags);
 	return IRQ_HANDLED;
@@ -2074,7 +2128,7 @@ int usb_gadget_register_driver (struct usb_gadget_driver *driver)
 		if (ep->bmAttributes == USB_ENDPOINT_XFER_ISOC)
 			continue;
 		use_ep(ep, 0);
-		UDC_CTRL_REG = UDC_SET_HALT;
+		omap_writew(UDC_SET_HALT, UDC_CTRL);
 	}
 	udc->ep0_pending = 0;
 	udc->ep[0].irqs = 0;
@@ -2098,7 +2152,7 @@ int usb_gadget_register_driver (struct usb_gadget_driver *driver)
 	}
 	DBG("bound to driver %s\n", driver->driver.name);
 
-	UDC_IRQ_SRC_REG = UDC_IRQ_SRC_MASK;
+	omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
 
 	/* connect to bus through transceiver */
 	if (udc->transceiver) {
@@ -2195,7 +2249,7 @@ static void proc_ep_show(struct seq_file *s, struct omap_ep *ep)
 	else
 		buf[0] = 0;
 
-	stat_flg = UDC_STAT_FLG_REG;
+	stat_flg = omap_readw(UDC_STAT_FLG);
 	seq_printf(s,
 		"\n%s %s%s%sirqs %ld stat %04x " EIGHTBITS FOURBITS "%s\n",
 		ep->name, buf,
@@ -2262,11 +2316,11 @@ static int proc_otg_show(struct seq_file *s)
 		trans = CONTROL_DEVCONF_REG;
 	} else {
 		ctrl_name = "tranceiver_ctrl";
-		trans = USB_TRANSCEIVER_CTRL_REG;
+		trans = omap_readw(USB_TRANSCEIVER_CTRL);
 	}
 	seq_printf(s, "\nOTG rev %d.%d, %s %05x\n",
 		tmp >> 4, tmp & 0xf, ctrl_name, trans);
-	tmp = OTG_SYSCON_1_REG;
+	tmp = omap_readw(OTG_SYSCON_1);
 	seq_printf(s, "otg_syscon1 %08x usb2 %s, usb1 %s, usb0 %s,"
 			FOURBITS "\n", tmp,
 		trx_mode(USB2_TRX_MODE(tmp), trans & CONF_USB2_UNI_R),
@@ -2278,7 +2332,7 @@ static int proc_otg_show(struct seq_file *s)
 		(tmp & HST_IDLE_EN) ? " !host" : "",
 		(tmp & DEV_IDLE_EN) ? " !dev" : "",
 		(tmp & OTG_RESET_DONE) ? " reset_done" : " reset_active");
-	tmp = OTG_SYSCON_2_REG;
+	tmp = omap_readl(OTG_SYSCON_2);
 	seq_printf(s, "otg_syscon2 %08x%s" EIGHTBITS
 			" b_ase_brst=%d hmc=%d\n", tmp,
 		(tmp & OTG_EN) ? " otg_en" : "",
@@ -2293,7 +2347,7 @@ static int proc_otg_show(struct seq_file *s)
 		(tmp & HMC_TLLATTACH) ? " tllattach" : "",
 		B_ASE_BRST(tmp),
 		OTG_HMC(tmp));
-	tmp = OTG_CTRL_REG;
+	tmp = omap_readl(OTG_CTRL);
 	seq_printf(s, "otg_ctrl    %06x" EIGHTBITS EIGHTBITS "%s\n", tmp,
 		(tmp & OTG_ASESSVLD) ? " asess" : "",
 		(tmp & OTG_BSESSEND) ? " bsess_end" : "",
@@ -2313,13 +2367,13 @@ static int proc_otg_show(struct seq_file *s)
 		(tmp & OTG_PU_VBUS) ? " pu_vb" : "",
 		(tmp & OTG_PU_ID) ? " pu_id" : ""
 		);
-	tmp = OTG_IRQ_EN_REG;
+	tmp = omap_readw(OTG_IRQ_EN);
 	seq_printf(s, "otg_irq_en  %04x" "\n", tmp);
-	tmp = OTG_IRQ_SRC_REG;
+	tmp = omap_readw(OTG_IRQ_SRC);
 	seq_printf(s, "otg_irq_src %04x" "\n", tmp);
-	tmp = OTG_OUTCTRL_REG;
+	tmp = omap_readw(OTG_OUTCTRL);
 	seq_printf(s, "otg_outctrl %04x" "\n", tmp);
-	tmp = OTG_TEST_REG;
+	tmp = omap_readw(OTG_TEST);
 	seq_printf(s, "otg_test    %04x" "\n", tmp);
 	return 0;
 }
@@ -2340,7 +2394,7 @@ static int proc_udc_show(struct seq_file *s, void *_)
 		driver_desc,
 		use_dma ?  " (dma)" : "");
 
-	tmp = UDC_REV_REG & 0xff;
+	tmp = omap_readw(UDC_REV) & 0xff;
 	seq_printf(s,
 		"UDC rev %d.%d, fifo mode %d, gadget %s\n"
 		"hmc %d, transceiver %s\n",
@@ -2354,16 +2408,16 @@ static int proc_udc_show(struct seq_file *s, void *_)
 				? "external" : "(none)"));
 	if (cpu_class_is_omap1()) {
 		seq_printf(s, "ULPD control %04x req %04x status %04x\n",
-			__REG16(ULPD_CLOCK_CTRL),
-			__REG16(ULPD_SOFT_REQ),
-			__REG16(ULPD_STATUS_REQ));
+			omap_readw(ULPD_CLOCK_CTRL),
+			omap_readw(ULPD_SOFT_REQ),
+			omap_readw(ULPD_STATUS_REQ));
 	}
 
 	/* OTG controller registers */
 	if (!cpu_is_omap15xx())
 		proc_otg_show(s);
 
-	tmp = UDC_SYSCON1_REG;
+	tmp = omap_readw(UDC_SYSCON1);
 	seq_printf(s, "\nsyscon1     %04x" EIGHTBITS "\n", tmp,
 		(tmp & UDC_CFG_LOCK) ? " cfg_lock" : "",
 		(tmp & UDC_DATA_ENDIAN) ? " data_endian" : "",
@@ -2382,7 +2436,7 @@ static int proc_udc_show(struct seq_file *s, void *_)
 		return 0;
 	}
 
-	tmp = UDC_DEVSTAT_REG;
+	tmp = omap_readw(UDC_DEVSTAT);
 	seq_printf(s, "devstat     %04x" EIGHTBITS "%s%s\n", tmp,
 		(tmp & UDC_B_HNP_ENABLE) ? " b_hnp" : "",
 		(tmp & UDC_A_HNP_SUPPORT) ? " a_hnp" : "",
@@ -2394,20 +2448,20 @@ static int proc_udc_show(struct seq_file *s, void *_)
 		(tmp & UDC_ADD) ? " ADD" : "",
 		(tmp & UDC_DEF) ? " DEF" : "",
 		(tmp & UDC_ATT) ? " ATT" : "");
-	seq_printf(s, "sof         %04x\n", UDC_SOF_REG);
-	tmp = UDC_IRQ_EN_REG;
+	seq_printf(s, "sof         %04x\n", omap_readw(UDC_SOF));
+	tmp = omap_readw(UDC_IRQ_EN);
 	seq_printf(s, "irq_en      %04x" FOURBITS "%s\n", tmp,
 		(tmp & UDC_SOF_IE) ? " sof" : "",
 		(tmp & UDC_EPN_RX_IE) ? " epn_rx" : "",
 		(tmp & UDC_EPN_TX_IE) ? " epn_tx" : "",
 		(tmp & UDC_DS_CHG_IE) ? " ds_chg" : "",
 		(tmp & UDC_EP0_IE) ? " ep0" : "");
-	tmp = UDC_IRQ_SRC_REG;
+	tmp = omap_readw(UDC_IRQ_SRC);
 	seq_printf(s, "irq_src     %04x" EIGHTBITS "%s%s\n", tmp,
 		(tmp & UDC_TXN_DONE) ? " txn_done" : "",
 		(tmp & UDC_RXN_CNT) ? " rxn_cnt" : "",
 		(tmp & UDC_RXN_EOT) ? " rxn_eot" : "",
-		(tmp & UDC_SOF) ? " sof" : "",
+		(tmp & UDC_IRQ_SOF) ? " sof" : "",
 		(tmp & UDC_EPN_RX) ? " epn_rx" : "",
 		(tmp & UDC_EPN_TX) ? " epn_tx" : "",
 		(tmp & UDC_DS_CHG) ? " ds_chg" : "",
@@ -2417,7 +2471,7 @@ static int proc_udc_show(struct seq_file *s, void *_)
 	if (use_dma) {
 		unsigned i;
 
-		tmp = UDC_DMA_IRQ_EN_REG;
+		tmp = omap_readw(UDC_DMA_IRQ_EN);
 		seq_printf(s, "dma_irq_en  %04x%s" EIGHTBITS "\n", tmp,
 			(tmp & UDC_TX_DONE_IE(3)) ? " tx2_done" : "",
 			(tmp & UDC_RX_CNT_IE(3)) ? " rx2_cnt" : "",
@@ -2431,29 +2485,29 @@ static int proc_udc_show(struct seq_file *s, void *_)
 			(tmp & UDC_RX_CNT_IE(1)) ? " rx0_cnt" : "",
 			(tmp & UDC_RX_EOT_IE(1)) ? " rx0_eot" : "");
 
-		tmp = UDC_RXDMA_CFG_REG;
+		tmp = omap_readw(UDC_RXDMA_CFG);
 		seq_printf(s, "rxdma_cfg   %04x\n", tmp);
 		if (tmp) {
 			for (i = 0; i < 3; i++) {
 				if ((tmp & (0x0f << (i * 4))) == 0)
 					continue;
 				seq_printf(s, "rxdma[%d]    %04x\n", i,
-						UDC_RXDMA_REG(i + 1));
+						omap_readw(UDC_RXDMA(i + 1)));
 			}
 		}
-		tmp = UDC_TXDMA_CFG_REG;
+		tmp = omap_readw(UDC_TXDMA_CFG);
 		seq_printf(s, "txdma_cfg   %04x\n", tmp);
 		if (tmp) {
 			for (i = 0; i < 3; i++) {
 				if (!(tmp & (0x0f << (i * 4))))
 					continue;
 				seq_printf(s, "txdma[%d]    %04x\n", i,
-						UDC_TXDMA_REG(i + 1));
+						omap_readw(UDC_TXDMA(i + 1)));
 			}
 		}
 	}
 
-	tmp = UDC_DEVSTAT_REG;
+	tmp = omap_readw(UDC_DEVSTAT);
 	if (tmp & UDC_ATT) {
 		proc_ep_show(s, &udc->ep[0]);
 		if (tmp & UDC_ADD) {
@@ -2505,7 +2559,7 @@ static inline void remove_proc_file(void) {}
  * buffer space among the endpoints we'll be operating.
  *
  * NOTE: as of OMAP 1710 ES2.0, writing a new endpoint config when
- * UDC_SYSCON_1_REG.CFG_LOCK is set can now work.  We won't use that
+ * UDC_SYSCON_1.CFG_LOCK is set can now work.  We won't use that
  * capability yet though.
  */
 static unsigned __init
@@ -2567,9 +2621,9 @@ omap_ep_setup(char *name, u8 addr, u8 type,
 		name, addr, epn_rxtx, maxp, dbuf ? "x2" : "", buf);
 
 	if (addr & USB_DIR_IN)
-		UDC_EP_TX_REG(addr & 0xf) = epn_rxtx;
+		omap_writew(epn_rxtx, UDC_EP_TX(addr & 0xf));
 	else
-		UDC_EP_RX_REG(addr) = epn_rxtx;
+		omap_writew(epn_rxtx, UDC_EP_RX(addr));
 
 	/* next endpoint's buffer starts after this one's */
 	buf += maxp;
@@ -2608,15 +2662,15 @@ omap_udc_setup(struct platform_device *odev, struct otg_transceiver *xceiv)
 	unsigned	tmp, buf;
 
 	/* abolish any previous hardware state */
-	UDC_SYSCON1_REG = 0;
-	UDC_IRQ_EN_REG = 0;
-	UDC_IRQ_SRC_REG = UDC_IRQ_SRC_MASK;
-	UDC_DMA_IRQ_EN_REG = 0;
-	UDC_RXDMA_CFG_REG = 0;
-	UDC_TXDMA_CFG_REG = 0;
+	omap_writew(0, UDC_SYSCON1);
+	omap_writew(0, UDC_IRQ_EN);
+	omap_writew(UDC_IRQ_SRC_MASK, UDC_IRQ_SRC);
+	omap_writew(0, UDC_DMA_IRQ_EN);
+	omap_writew(0, UDC_RXDMA_CFG);
+	omap_writew(0, UDC_TXDMA_CFG);
 
 	/* UDC_PULLUP_EN gates the chip clock */
-	// OTG_SYSCON_1_REG |= DEV_IDLE_EN;
+	// OTG_SYSCON_1 |= DEV_IDLE_EN;
 
 	udc = kzalloc(sizeof(*udc), GFP_KERNEL);
 	if (!udc)
@@ -2647,8 +2701,8 @@ omap_udc_setup(struct platform_device *odev, struct otg_transceiver *xceiv)
 
 	/* initially disable all non-ep0 endpoints */
 	for (tmp = 1; tmp < 15; tmp++) {
-		UDC_EP_RX_REG(tmp) = 0;
-		UDC_EP_TX_REG(tmp) = 0;
+		omap_writew(0, UDC_EP_RX(tmp));
+		omap_writew(0, UDC_EP_TX(tmp));
 	}
 
 #define OMAP_BULK_EP(name,addr) \
@@ -2733,7 +2787,7 @@ omap_udc_setup(struct platform_device *odev, struct otg_transceiver *xceiv)
 		ERR("unsupported fifo_mode #%d\n", fifo_mode);
 		return -ENODEV;
 	}
-	UDC_SYSCON1_REG = UDC_CFG_LOCK|UDC_SELF_PWR;
+	omap_writew(UDC_CFG_LOCK|UDC_SELF_PWR, UDC_SYSCON1);
 	INFO("fifo mode %d, %d bytes not used\n", fifo_mode, 2048 - buf);
 	return 0;
 }
@@ -2777,7 +2831,7 @@ static int __init omap_udc_probe(struct platform_device *pdev)
 	}
 
 	INFO("OMAP UDC rev %d.%d%s\n",
-		UDC_REV_REG >> 4, UDC_REV_REG & 0xf,
+		omap_readw(UDC_REV) >> 4, omap_readw(UDC_REV) & 0xf,
 		config->otg ? ", Mini-AB" : "");
 
 	/* use the mode given to us by board init code */
@@ -2792,12 +2846,12 @@ static int __init omap_udc_probe(struct platform_device *pdev)
 			 * know when to turn PULLUP_EN on/off; and that
 			 * means we always "need" the 48MHz clock.
 			 */
-			u32 tmp = FUNC_MUX_CTRL_0_REG;
-
-			FUNC_MUX_CTRL_0_REG &= ~VBUS_CTRL_1510;
+			u32 tmp = omap_readl(FUNC_MUX_CTRL_0);
+			tmp &= ~VBUS_CTRL_1510;
+			omap_writel(tmp, FUNC_MUX_CTRL_0);
 			tmp |= VBUS_MODE_1510;
 			tmp &= ~VBUS_CTRL_1510;
-			FUNC_MUX_CTRL_0_REG = tmp;
+			omap_writel(tmp, FUNC_MUX_CTRL_0);
 		}
 	} else {
 		/* The transceiver may package some GPIO logic or handle
@@ -2877,7 +2931,7 @@ known:
 #endif
 
 	/* starting with omap1710 es2.0, clear toggle is a separate bit */
-	if (UDC_REV_REG >= 0x61)
+	if (omap_readw(UDC_REV) >= 0x61)
 		udc->clr_halt = UDC_RESET_EP | UDC_CLRDATA_TOGGLE;
 	else
 		udc->clr_halt = UDC_RESET_EP;
@@ -2975,7 +3029,7 @@ static int __exit omap_udc_remove(struct platform_device *pdev)
 		put_device(udc->transceiver->dev);
 		udc->transceiver = NULL;
 	}
-	UDC_SYSCON1_REG = 0;
+	omap_writew(0, UDC_SYSCON1);
 
 	remove_proc_file();
 
@@ -3006,7 +3060,7 @@ static int __exit omap_udc_remove(struct platform_device *pdev)
  *
  * REVISIT we should probably reject suspend requests when there's a host
  * session active, rather than disconnecting, at least on boards that can
- * report VBUS irqs (UDC_DEVSTAT_REG.UDC_ATT).  And in any case, we need to
+ * report VBUS irqs (UDC_DEVSTAT.UDC_ATT).  And in any case, we need to
  * make host resumes and VBUS detection trigger OMAP wakeup events; that
  * may involve talking to an external transceiver (e.g. isp1301).
  */
@@ -3015,7 +3069,7 @@ static int omap_udc_suspend(struct platform_device *dev, pm_message_t message)
 {
 	u32	devstat;
 
-	devstat = UDC_DEVSTAT_REG;
+	devstat = omap_readw(UDC_DEVSTAT);
 
 	/* we're requesting 48 MHz clock if the pullup is enabled
 	 * (== we're attached to the host) and we're not suspended,
diff --git a/drivers/usb/gadget/omap_udc.h b/drivers/usb/gadget/omap_udc.h
index c6b9cbc7230..8522bbb1227 100644
--- a/drivers/usb/gadget/omap_udc.h
+++ b/drivers/usb/gadget/omap_udc.h
@@ -8,23 +8,22 @@
 /*
  * USB device/endpoint management registers
  */
-#define UDC_REG(offset)              __REG16(UDC_BASE + (offset))
 
-#define	UDC_REV_REG			UDC_REG(0x0)	/* Revision */
-#define	UDC_EP_NUM_REG			UDC_REG(0x4)	/* Which endpoint */
+#define	UDC_REV				(UDC_BASE + 0x0)	/* Revision */
+#define	UDC_EP_NUM			(UDC_BASE + 0x4)	/* Which endpoint */
 #	define	UDC_SETUP_SEL		(1 << 6)
 #	define	UDC_EP_SEL		(1 << 5)
 #	define	UDC_EP_DIR		(1 << 4)
 	/* low 4 bits for endpoint number */
-#define	UDC_DATA_REG			UDC_REG(0x08)	/* Endpoint FIFO */
-#define	UDC_CTRL_REG			UDC_REG(0x0C)	/* Endpoint control */
+#define	UDC_DATA			(UDC_BASE + 0x08)	/* Endpoint FIFO */
+#define	UDC_CTRL			(UDC_BASE + 0x0C)	/* Endpoint control */
 #	define	UDC_CLR_HALT		(1 << 7)
 #	define	UDC_SET_HALT		(1 << 6)
 #	define	UDC_CLRDATA_TOGGLE	(1 << 3)
 #	define	UDC_SET_FIFO_EN		(1 << 2)
 #	define	UDC_CLR_EP		(1 << 1)
 #	define	UDC_RESET_EP		(1 << 0)
-#define	UDC_STAT_FLG_REG		UDC_REG(0x10)	/* Endpoint status */
+#define	UDC_STAT_FLG			(UDC_BASE + 0x10)	/* Endpoint status */
 #	define	UDC_NO_RXPACKET		(1 << 15)
 #	define	UDC_MISS_IN		(1 << 14)
 #	define	UDC_DATA_FLUSH		(1 << 13)
@@ -38,8 +37,8 @@
 #	define	UDC_FIFO_EN		(1 << 2)
 #	define	UDC_NON_ISO_FIFO_EMPTY	(1 << 1)
 #	define	UDC_NON_ISO_FIFO_FULL	(1 << 0)
-#define	UDC_RXFSTAT_REG			UDC_REG(0x14)	/* OUT bytecount */
-#define	UDC_SYSCON1_REG			UDC_REG(0x18)	/* System config 1 */
+#define	UDC_RXFSTAT			(UDC_BASE + 0x14)	/* OUT bytecount */
+#define	UDC_SYSCON1			(UDC_BASE + 0x18)	/* System config 1 */
 #	define	UDC_CFG_LOCK		(1 << 8)
 #	define	UDC_DATA_ENDIAN		(1 << 7)
 #	define	UDC_DMA_ENDIAN		(1 << 6)
@@ -48,12 +47,12 @@
 #	define	UDC_SELF_PWR		(1 << 2)
 #	define	UDC_SOFF_DIS		(1 << 1)
 #	define	UDC_PULLUP_EN		(1 << 0)
-#define	UDC_SYSCON2_REG			UDC_REG(0x1C)	/* System config 2 */
+#define	UDC_SYSCON2			(UDC_BASE + 0x1C)	/* System config 2 */
 #	define	UDC_RMT_WKP		(1 << 6)
 #	define	UDC_STALL_CMD		(1 << 5)
 #	define	UDC_DEV_CFG		(1 << 3)
 #	define	UDC_CLR_CFG		(1 << 2)
-#define	UDC_DEVSTAT_REG			UDC_REG(0x20)	/* Device status */
+#define	UDC_DEVSTAT			(UDC_BASE + 0x20)	/* Device status */
 #	define	UDC_B_HNP_ENABLE	(1 << 9)
 #	define	UDC_A_HNP_SUPPORT	(1 << 8)
 #	define	UDC_A_ALT_HNP_SUPPORT	(1 << 7)
@@ -64,26 +63,26 @@
 #	define	UDC_ADD			(1 << 2)
 #	define	UDC_DEF			(1 << 1)
 #	define	UDC_ATT			(1 << 0)
-#define	UDC_SOF_REG			UDC_REG(0x24)	/* Start of frame */
+#define	UDC_SOF				(UDC_BASE + 0x24)	/* Start of frame */
 #	define	UDC_FT_LOCK		(1 << 12)
 #	define	UDC_TS_OK		(1 << 11)
 #	define	UDC_TS			0x03ff
-#define	UDC_IRQ_EN_REG			UDC_REG(0x28)	/* Interrupt enable */
+#define	UDC_IRQ_EN			(UDC_BASE + 0x28)	/* Interrupt enable */
 #	define	UDC_SOF_IE		(1 << 7)
 #	define	UDC_EPN_RX_IE		(1 << 5)
 #	define	UDC_EPN_TX_IE		(1 << 4)
 #	define	UDC_DS_CHG_IE		(1 << 3)
 #	define	UDC_EP0_IE		(1 << 0)
-#define	UDC_DMA_IRQ_EN_REG		UDC_REG(0x2C)	/* DMA irq enable */
+#define	UDC_DMA_IRQ_EN			(UDC_BASE + 0x2C)	/* DMA irq enable */
 	/* rx/tx dma channels numbered 1-3 not 0-2 */
 #	define	UDC_TX_DONE_IE(n)	(1 << (4 * (n) - 2))
 #	define	UDC_RX_CNT_IE(n)	(1 << (4 * (n) - 3))
 #	define	UDC_RX_EOT_IE(n)	(1 << (4 * (n) - 4))
-#define	UDC_IRQ_SRC_REG			UDC_REG(0x30)	/* Interrupt source */
+#define	UDC_IRQ_SRC			(UDC_BASE + 0x30)	/* Interrupt source */
 #	define	UDC_TXN_DONE		(1 << 10)
 #	define	UDC_RXN_CNT		(1 << 9)
 #	define	UDC_RXN_EOT		(1 << 8)
-#	define	UDC_SOF			(1 << 7)
+#	define	UDC_IRQ_SOF		(1 << 7)
 #	define	UDC_EPN_RX		(1 << 5)
 #	define	UDC_EPN_TX		(1 << 4)
 #	define	UDC_DS_CHG		(1 << 3)
@@ -91,41 +90,41 @@
 #	define	UDC_EP0_RX		(1 << 1)
 #	define	UDC_EP0_TX		(1 << 0)
 #	define	UDC_IRQ_SRC_MASK	0x7bf
-#define	UDC_EPN_STAT_REG		UDC_REG(0x34)	/* EP irq status */
-#define	UDC_DMAN_STAT_REG		UDC_REG(0x38)	/* DMA irq status */
+#define	UDC_EPN_STAT			(UDC_BASE + 0x34)	/* EP irq status */
+#define	UDC_DMAN_STAT			(UDC_BASE + 0x38)	/* DMA irq status */
 #	define	UDC_DMA_RX_SB		(1 << 12)
 #	define	UDC_DMA_RX_SRC(x)	(((x)>>8) & 0xf)
 #	define	UDC_DMA_TX_SRC(x)	(((x)>>0) & 0xf)
 
 
 /* DMA configuration registers:  up to three channels in each direction.  */
-#define	UDC_RXDMA_CFG_REG		UDC_REG(0x40)	/* 3 eps for RX DMA */
+#define	UDC_RXDMA_CFG			(UDC_BASE + 0x40)	/* 3 eps for RX DMA */
 #	define	UDC_DMA_REQ		(1 << 12)
-#define	UDC_TXDMA_CFG_REG		UDC_REG(0x44)	/* 3 eps for TX DMA */
-#define	UDC_DATA_DMA_REG		UDC_REG(0x48)	/* rx/tx fifo addr */
+#define	UDC_TXDMA_CFG			(UDC_BASE + 0x44)	/* 3 eps for TX DMA */
+#define	UDC_DATA_DMA			(UDC_BASE + 0x48)	/* rx/tx fifo addr */
 
 /* rx/tx dma control, numbering channels 1-3 not 0-2 */
-#define	UDC_TXDMA_REG(chan)		UDC_REG(0x50 - 4 + 4 * (chan))
+#define	UDC_TXDMA(chan)			(UDC_BASE + 0x50 - 4 + 4 * (chan))
 #	define UDC_TXN_EOT		(1 << 15)	/* bytes vs packets */
 #	define UDC_TXN_START		(1 << 14)	/* start transfer */
 #	define UDC_TXN_TSC		0x03ff		/* units in xfer */
-#define	UDC_RXDMA_REG(chan)		UDC_REG(0x60 - 4 + 4 * (chan))
+#define	UDC_RXDMA(chan)			(UDC_BASE + 0x60 - 4 + 4 * (chan))
 #	define UDC_RXN_STOP		(1 << 15)	/* enable EOT irq */
 #	define UDC_RXN_TC		0x00ff		/* packets in xfer */
 
 
 /*
  * Endpoint configuration registers (used before CFG_LOCK is set)
- * UDC_EP_TX_REG(0) is unused
+ * UDC_EP_TX(0) is unused
  */
-#define	UDC_EP_RX_REG(endpoint)		UDC_REG(0x80 + (endpoint)*4)
+#define	UDC_EP_RX(endpoint)		(UDC_BASE + 0x80 + (endpoint)*4)
 #	define	UDC_EPN_RX_VALID	(1 << 15)
 #	define	UDC_EPN_RX_DB		(1 << 14)
 	/* buffer size in bits 13, 12 */
 #	define	UDC_EPN_RX_ISO		(1 << 11)
 	/* buffer pointer in low 11 bits */
-#define	UDC_EP_TX_REG(endpoint)		UDC_REG(0xc0 + (endpoint)*4)
-	/* same bitfields as in RX_REG */
+#define	UDC_EP_TX(endpoint)		(UDC_BASE + 0xc0 + (endpoint)*4)
+	/* same bitfields as in RX */
 
 /*-------------------------------------------------------------------------*/
 
@@ -195,14 +194,14 @@ struct omap_udc {
 
 /*-------------------------------------------------------------------------*/
 
-#define	MOD_CONF_CTRL_0_REG	__REG32(MOD_CONF_CTRL_0)
-#define	VBUS_W2FC_1510		(1 << 17)	/* 0 gpio0, 1 dvdd2 pin */
+/* MOD_CONF_CTRL_0 */
+#define VBUS_W2FC_1510		(1 << 17)	/* 0 gpio0, 1 dvdd2 pin */
 
-#define	FUNC_MUX_CTRL_0_REG	__REG32(FUNC_MUX_CTRL_0)
+/* FUNC_MUX_CTRL_0 */
 #define	VBUS_CTRL_1510		(1 << 19)	/* 1 connected (software) */
 #define	VBUS_MODE_1510		(1 << 18)	/* 0 hardware, 1 software */
 
-#define	HMC_1510	((MOD_CONF_CTRL_0_REG >> 1) & 0x3f)
-#define	HMC_1610	(OTG_SYSCON_2_REG & 0x3f)
+#define	HMC_1510	((omap_readl(MOD_CONF_CTRL_0) >> 1) & 0x3f)
+#define	HMC_1610	(omap_readl(OTG_SYSCON_2) & 0x3f)
 #define	HMC		(cpu_is_omap15xx() ? HMC_1510 : HMC_1610)
 
diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
index 6859fb5f1d6..2b7c04079d5 100644
--- a/drivers/usb/host/ohci-omap.c
+++ b/drivers/usb/host/ohci-omap.c
@@ -169,13 +169,16 @@ static void start_hnp(struct ohci_hcd *ohci)
 {
 	const unsigned	port = ohci_to_hcd(ohci)->self.otg_port - 1;
 	unsigned long	flags;
+	u32 l;
 
 	otg_start_hnp(ohci->transceiver);
 
 	local_irq_save(flags);
 	ohci->transceiver->state = OTG_STATE_A_SUSPEND;
 	writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
-	OTG_CTRL_REG &= ~OTG_A_BUSREQ;
+	l = omap_readl(OTG_CTRL);
+	l &= ~OTG_A_BUSREQ;
+	omap_writel(l, OTG_CTRL);
 	local_irq_restore(flags);
 }
 
diff --git a/include/asm-arm/arch-omap/usb.h b/include/asm-arm/arch-omap/usb.h
index 2147d18aaea..ddf1861e6df 100644
--- a/include/asm-arm/arch-omap/usb.h
+++ b/include/asm-arm/arch-omap/usb.h
@@ -34,11 +34,8 @@
 /*
  * OTG and transceiver registers, for OMAPs starting with ARM926
  */
-#define OTG_REG32(offset)		__REG32(OTG_BASE + (offset))
-#define OTG_REG16(offset)		__REG16(OTG_BASE + (offset))
-
-#define OTG_REV_REG			OTG_REG32(0x00)
-#define OTG_SYSCON_1_REG		OTG_REG32(0x04)
+#define OTG_REV				(OTG_BASE + 0x00)
+#define OTG_SYSCON_1			(OTG_BASE + 0x04)
 #	define	 USB2_TRX_MODE(w)	(((w)>>24)&0x07)
 #	define	 USB1_TRX_MODE(w)	(((w)>>20)&0x07)
 #	define	 USB0_TRX_MODE(w)	(((w)>>16)&0x07)
@@ -47,7 +44,7 @@
 #	define	 DEV_IDLE_EN		(1 << 13)
 #	define	 OTG_RESET_DONE		(1 << 2)
 #	define	 OTG_SOFT_RESET		(1 << 1)
-#define OTG_SYSCON_2_REG		OTG_REG32(0x08)
+#define OTG_SYSCON_2			(OTG_BASE + 0x08)
 #	define	 OTG_EN			(1 << 31)
 #	define	 USBX_SYNCHRO		(1 << 30)
 #	define	 OTG_MST16		(1 << 29)
@@ -65,7 +62,7 @@
 #	define	 HMC_TLLSPEED		(1 << 7)
 #	define	 HMC_TLLATTACH		(1 << 6)
 #	define	 OTG_HMC(w)		(((w)>>0)&0x3f)
-#define OTG_CTRL_REG			OTG_REG32(0x0c)
+#define OTG_CTRL			(OTG_BASE + 0x0c)
 #	define	 OTG_USB2_EN		(1 << 29)
 #	define	 OTG_USB2_DP		(1 << 28)
 #	define	 OTG_USB2_DM		(1 << 27)
@@ -92,7 +89,7 @@
 #	define	 OTG_PD_VBUS		(1 << 2)
 #	define	 OTG_PU_VBUS		(1 << 1)
 #	define	 OTG_PU_ID		(1 << 0)
-#define OTG_IRQ_EN_REG			OTG_REG16(0x10)
+#define OTG_IRQ_EN			(OTG_BASE + 0x10)	/* 16-bit */
 #	define	 DRIVER_SWITCH		(1 << 15)
 #	define	 A_VBUS_ERR		(1 << 13)
 #	define	 A_REQ_TMROUT		(1 << 12)
@@ -102,9 +99,9 @@
 #	define	 B_SRP_DONE		(1 << 8)
 #	define	 B_SRP_STARTED		(1 << 7)
 #	define	 OPRT_CHG		(1 << 0)
-#define OTG_IRQ_SRC_REG			OTG_REG16(0x14)
+#define OTG_IRQ_SRC			(OTG_BASE + 0x14)	/* 16-bit */
 	// same bits as in IRQ_EN
-#define OTG_OUTCTRL_REG			OTG_REG16(0x18)
+#define OTG_OUTCTRL			(OTG_BASE + 0x18)	/* 16-bit */
 #	define	 OTGVPD			(1 << 14)
 #	define	 OTGVPU			(1 << 13)
 #	define	 OTGPUID		(1 << 12)
@@ -117,13 +114,13 @@
 #	define	 USB0VDR		(1 << 2)
 #	define	 USB0PDEN		(1 << 1)
 #	define	 USB0PUEN		(1 << 0)
-#define OTG_TEST_REG			OTG_REG16(0x20)
-#define OTG_VENDOR_CODE_REG		OTG_REG32(0xfc)
+#define OTG_TEST			(OTG_BASE + 0x20)	/* 16-bit */
+#define OTG_VENDOR_CODE			(OTG_BASE + 0xfc)	/* 16-bit */
 
 /*-------------------------------------------------------------------------*/
 
 /* OMAP1 */
-#define	USB_TRANSCEIVER_CTRL_REG	__REG32(0xfffe1000 + 0x0064)
+#define	USB_TRANSCEIVER_CTRL		(0xfffe1000 + 0x0064)
 #	define	CONF_USB2_UNI_R		(1 << 8)
 #	define	CONF_USB1_UNI_R		(1 << 7)
 #	define	CONF_USB_PORT0_R(x)	(((x)>>4)&0x7)