From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marek Vasut <marex@denx.de>
Date: Sat, 30 Mar 2013 07:27:27 +0100
Subject: [U-Boot] [PATCH 05/11] usb-gadget: add FOTG210 USB gadget
	support
In-Reply-To: <1364540788-13943-6-git-send-email-dantesu@gmail.com>
References: <1364540788-13943-1-git-send-email-dantesu@gmail.com>
	<1364540788-13943-6-git-send-email-dantesu@gmail.com>
Message-ID: <201303300727.27593.marex@denx.de>
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To: u-boot@lists.denx.de

Dear Kuo-Jung Su,

> From: Kuo-Jung Su <dantesu@faraday-tech.com>
> 
> This patch would try to use Faraday FOTG210 to implement
> a USB RNDIS Ethernet.
> 
> Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>

[...]

> +static inline int
> +ep_reset(struct fotg210_chip *chip, uint8_t ep_addr)
> +{
> +	int ep = ep_addr & USB_ENDPOINT_NUMBER_MASK;
> +
> +	if (ep_addr & USB_DIR_IN) {
> +		/* input */
> +		USB_REG32(chip, REG_IEP1 + (ep - 1) * 4) |= BIT(12);
> +		USB_REG32(chip, REG_IEP1 + (ep - 1) * 4) &= ~BIT(12);
> +		USB_REG32(chip, REG_IEP1 + (ep - 1) * 4) &= ~BIT(11);
> +	} else {
> +		/* output */
> +		USB_REG32(chip, REG_OEP1 + (ep - 1) * 4) |= BIT(12);
> +		USB_REG32(chip, REG_OEP1 + (ep - 1) * 4) &= BIT(12);
> +		USB_REG32(chip, REG_OEP1 + (ep - 1) * 4) &= BIT(11);
> +	}

Use readl(), writel(), clrsetbits_le32() etc.

For example see drivers/i2c/mxs_i2c.c

[...]

> +/*
> + * Global Registers
> + */
> +#define REG_ISR         0x0C0    /* Interrupt Status */
> +#define REG_IMR         0x0C4    /* Interrupt Control */

Use structure based access, ie.

arch/arm/include/asm/arch-mxs/regs-i2c.h

struct regs {
	uint32_t reg1;
	uint32_t reg2;
...
};

writel(val, &regs->reg1);