From mboxrd@z Thu Jan  1 00:00:00 1970
From: Reinhard Meyer <u-boot@emk-elektronik.de>
Date: Sun, 10 Oct 2010 11:33:31 +0200
Subject: [U-Boot] [PATCH] mmc: seperate block number into small parts
 for multi-write cmd
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Dear all concerned,
> But my (limited!) understanding is that it's not a platform problem
> you are solving, but one of this special kind of controller, which
> nobody else would ever run into.

I would vouch to extend

struct mmc {
	struct list_head link;
	char name[32];
	void *priv;
	uint voltages;
	uint version;
	uint f_min;
	uint f_max;
	int high_capacity;
	uint bus_width;
	uint clock;
	uint card_caps;
	uint host_caps;
+	uint host_maxblk;
+	uint host_maxdmalen;
	uint ocr;
	uint scr[2];
	uint csd[4];
	uint cid[4];
	ushort rca;
	uint tran_speed;
	uint read_bl_len;
	uint write_bl_len;
	u64 capacity;
	block_dev_desc_t block_dev;
	int (*send_cmd)(struct mmc *mmc,
			struct mmc_cmd *cmd, struct mmc_data *data);
	void (*set_ios)(struct mmc *mmc);
	int (*init)(struct mmc *mmc);
};

have the driver fill those values and the common mmc part act upon them,
provided they are non-zero. Zero means no limitation on the host side.

This should not break existing code.

I fail, however, to understand the 512 KiB limit on that hardware. It
would allow for only 1024 blocks, despite the 65535 allowed by the register.
Also I assume that limit is about a 512k boundary, not a 512k length???

Reinhard