MMC: S3C24XX MMC/SD driver.

This is the latest S3C MMC/SD driver by Thomas Kleffel
with cleanups as suggested by AKPM done by Ben Dooks.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Thomas Kleffel <tk@maintech.de>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

drivers/mmc/host/Kconfig

@@ -143,3 +143,14 @@ config MMC_SPI
 
 	  If unsure, or if your system has no SPI master driver, say N.
 
+config MMC_S3C
+	tristate "Samsung S3C SD/MMC Card Interface support"
+	depends on ARCH_S3C2410 && MMC
+	help
+	  This selects a driver for the MCI interface found in
+          Samsung's S3C2410, S3C2412, S3C2440, S3C2442 CPUs.
+	  If you have a board based on one of those and a MMC/SD
+	  slot, say Y or M here.
+
+	  If unsure, say N.
+

drivers/mmc/host/Makefile

@@ -18,4 +18,4 @@ obj-$(CONFIG_MMC_OMAP)		+= omap.o
 obj-$(CONFIG_MMC_AT91)		+= at91_mci.o
 obj-$(CONFIG_MMC_TIFM_SD)	+= tifm_sd.o
 obj-$(CONFIG_MMC_SPI)		+= mmc_spi.o
-
+obj-$(CONFIG_MMC_S3C)   	+= s3cmci.o

drivers/mmc/host/s3cmci.h

+/*
+ *  linux/drivers/mmc/s3cmci.h - Samsung S3C MCI driver
+ *
+ *  Copyright (C) 2004-2006 Thomas Kleffel, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* FIXME: DMA Resource management ?! */
+#define S3CMCI_DMA 0
+
+enum s3cmci_waitfor {
+	COMPLETION_NONE,
+	COMPLETION_FINALIZE,
+	COMPLETION_CMDSENT,
+	COMPLETION_RSPFIN,
+	COMPLETION_XFERFINISH,
+	COMPLETION_XFERFINISH_RSPFIN,
+};
+
+struct s3cmci_host {
+	struct platform_device	*pdev;
+	struct mmc_host		*mmc;
+	struct resource		*mem;
+	struct clk		*clk;
+	void __iomem		*base;
+	int			irq;
+	int			irq_cd;
+	int			dma;
+
+	unsigned long		clk_rate;
+	unsigned long		clk_div;
+	unsigned long		real_rate;
+	u8			prescaler;
+
+	int			is2440;
+	unsigned		sdiimsk;
+	unsigned		sdidata;
+	int			dodma;
+	int			dmatogo;
+
+	struct mmc_request	*mrq;
+	int			cmd_is_stop;
+
+	spinlock_t		complete_lock;
+	enum s3cmci_waitfor	complete_what;
+
+	int			dma_complete;
+
+	u32			pio_sgptr;
+	u32			pio_words;
+	u32			pio_count;
+	u32			*pio_ptr;
+#define XFER_NONE 0
+#define XFER_READ 1
+#define XFER_WRITE 2
+	u32			pio_active;
+
+	int			bus_width;
+
+	char 			dbgmsg_cmd[301];
+	char 			dbgmsg_dat[301];
+	char			*status;
+
+	unsigned int		ccnt, dcnt;
+	struct tasklet_struct	pio_tasklet;
+};

include/asm-arm/arch-s3c2410/regs-sdi.h

@@ -28,9 +28,15 @@
 #define S3C2410_SDIDCNT               (0x30)
 #define S3C2410_SDIDSTA               (0x34)
 #define S3C2410_SDIFSTA               (0x38)
+
 #define S3C2410_SDIDATA               (0x3C)
 #define S3C2410_SDIIMSK               (0x40)
 
+#define S3C2440_SDIDATA               (0x40)
+#define S3C2440_SDIIMSK               (0x3C)
+
+#define S3C2440_SDICON_SDRESET        (1<<8)
+#define S3C2440_SDICON_MMCCLOCK       (1<<5)
 #define S3C2410_SDICON_BYTEORDER      (1<<4)
 #define S3C2410_SDICON_SDIOIRQ        (1<<3)
 #define S3C2410_SDICON_RWAITEN        (1<<2)
@@ -42,7 +48,8 @@
 #define S3C2410_SDICMDCON_LONGRSP     (1<<10)
 #define S3C2410_SDICMDCON_WAITRSP     (1<<9)
 #define S3C2410_SDICMDCON_CMDSTART    (1<<8)
-#define S3C2410_SDICMDCON_INDEX       (0xff)
+#define S3C2410_SDICMDCON_SENDERHOST  (1<<6)
+#define S3C2410_SDICMDCON_INDEX       (0x3f)
 
 #define S3C2410_SDICMDSTAT_CRCFAIL    (1<<12)
 #define S3C2410_SDICMDSTAT_CMDSENT    (1<<11)
@@ -51,6 +58,9 @@
 #define S3C2410_SDICMDSTAT_XFERING    (1<<8)
 #define S3C2410_SDICMDSTAT_INDEX      (0xff)
 
+#define S3C2440_SDIDCON_DS_BYTE       (0<<22)
+#define S3C2440_SDIDCON_DS_HALFWORD   (1<<22)
+#define S3C2440_SDIDCON_DS_WORD       (2<<22)
 #define S3C2410_SDIDCON_IRQPERIOD     (1<<21)
 #define S3C2410_SDIDCON_TXAFTERRESP   (1<<20)
 #define S3C2410_SDIDCON_RXAFTERCMD    (1<<19)
@@ -59,6 +69,7 @@
 #define S3C2410_SDIDCON_WIDEBUS       (1<<16)
 #define S3C2410_SDIDCON_DMAEN         (1<<15)
 #define S3C2410_SDIDCON_STOP          (1<<14)
+#define S3C2440_SDIDCON_DATSTART      (1<<14)
 #define S3C2410_SDIDCON_DATMODE	      (3<<12)
 #define S3C2410_SDIDCON_BLKNUM        (0x7ff)
 
@@ -68,6 +79,7 @@
 #define S3C2410_SDIDCON_XFER_RXSTART  (2<<12)
 #define S3C2410_SDIDCON_XFER_TXSTART  (3<<12)
 
+#define S3C2410_SDIDCON_BLKNUM_MASK   (0xFFF)
 #define S3C2410_SDIDCNT_BLKNUM_SHIFT  (12)
 
 #define S3C2410_SDIDSTA_RDYWAITREQ    (1<<10)
@@ -82,10 +94,12 @@
 #define S3C2410_SDIDSTA_TXDATAON      (1<<1)
 #define S3C2410_SDIDSTA_RXDATAON      (1<<0)
 
+#define S3C2440_SDIFSTA_FIFORESET      (1<<16)
+#define S3C2440_SDIFSTA_FIFOFAIL       (3<<14)  /* 3 is correct (2 bits) */
 #define S3C2410_SDIFSTA_TFDET          (1<<13)
 #define S3C2410_SDIFSTA_RFDET          (1<<12)
-#define S3C2410_SDIFSTA_TXHALF         (1<<11)
-#define S3C2410_SDIFSTA_TXEMPTY        (1<<10)
+#define S3C2410_SDIFSTA_TFHALF         (1<<11)
+#define S3C2410_SDIFSTA_TFEMPTY        (1<<10)
 #define S3C2410_SDIFSTA_RFLAST         (1<<9)
 #define S3C2410_SDIFSTA_RFFULL         (1<<8)
 #define S3C2410_SDIFSTA_RFHALF         (1<<7)