Ongoing work on adding support for MMC-SPI using the S3C SPI driver.
Note that this doesn't produce a valid bitstream yet.

On GTA02, S3C SPI can only be used with WLAN if the SPI0 interface is
wired to the SDIO interface. This is described here:
http://svn.openmoko.org/developers/werner/wlan-spi/gta02-spi/rework.pdf

The correct wiring can be verified with the following script:
http://svn.openmoko.org/developers/werner/wlan-spi/gta02-spi/verify.sh

Not-Yet-Signed-off-by: Werner Almesberger <werner@openmoko.org>

Index: korig/arch/arm/mach-s3c2440/Kconfig
===================================================================
--- korig.orig/arch/arm/mach-s3c2440/Kconfig	2008-09-27 11:04:05.000000000 -0300
+++ korig/arch/arm/mach-s3c2440/Kconfig	2008-09-27 11:04:05.000000000 -0300
@@ -110,6 +110,15 @@
                 bool "GPIO bit-banging SPI"
                 select MMC_SPI
                 select SPI_S3C24XX_GPIO
+
+	config AR6K_SPI_S3C24XX
+		bool "Hardware-accelerated SPI (modification)"
+		select MMC_SPI
+		select SPI_S3C24XX
+		help
+		  This functionality requires that SPI0 is wired to
+		  the WLAN SDIO interface.
+
 endchoice
 
 endmenu
Index: korig/arch/arm/mach-s3c2440/mach-gta02.c
===================================================================
--- korig.orig/arch/arm/mach-s3c2440/mach-gta02.c	2008-09-27 11:04:05.000000000 -0300
+++ korig/arch/arm/mach-s3c2440/mach-gta02.c	2008-09-27 21:31:57.000000000 -0300
@@ -1234,9 +1234,7 @@
 /* ----- AR6000 WLAN interface --------------------------------------------- */
 
 
-/* shared by all SPI drivers */
-
-#if defined(CONFIG_AR6K_SPI_S3C24XX_GPIO)
+#if defined(CONFIG_AR6K_SPI_S3C24XX) || defined(CONFIG_AR6K_SPI_S3C24XX_GPIO)
 
 static struct spi_board_info gta02_spi_mmc_bdinfo = {
 	.modalias	= "mmc_spi",
@@ -1247,7 +1245,18 @@
 	.mode		= SPI_MODE_0,
 };
 
-#endif /* CONFIG_AR6K_SPI_S3C24XX_GPIO */
+#endif /* CONFIG_AR6K_SPI_S3C24XX || CONFIG_AR6K_SPI_S3C24XX_GPIO */
+
+
+#ifdef CONFIG_AR6K_SPI_S3C24XX
+
+static struct s3c2410_spi_info spi_wlan_cfg = {
+	.pin_cs		= S3C2410_GPG2,
+	.board_size	= 1,
+	.board_info	= &gta02_spi_mmc_bdinfo,
+};
+
+#endif /* CONFIG_AR6K_SPI_S3C24XX */
 
 
 #ifdef CONFIG_AR6K_SPI_S3C24XX_GPIO
@@ -1689,6 +1698,45 @@
 	platform_device_register(&gta02_spi_wlan);
 #endif /* CONFIG_AR6K_SPI_S3C24XX_GPIO */
 
+#ifdef CONFIG_AR6K_SPI_S3C24XX
+
+	printk(KERN_INFO "SPI/MMC co-existence: disabling SD/MMC\n");
+	s3c2410_gpio_cfgpin(S3C2410_GPE5, S3C2410_GPIO_INPUT);	/* CLK */
+	s3c2410_gpio_cfgpin(S3C2410_GPE6, S3C2410_GPIO_INPUT);	/* CMD */
+	s3c2410_gpio_cfgpin(S3C2410_GPE7, S3C2410_GPIO_INPUT);	/* DATA0 */
+	s3c2410_gpio_cfgpin(S3C2410_GPE8, S3C2410_GPIO_INPUT);	/* DATA1 */
+	s3c2410_gpio_cfgpin(S3C2410_GPE9, S3C2410_GPIO_INPUT);	/* DATA2 */
+	s3c2410_gpio_cfgpin(S3C2410_GPE10, S3C2410_GPIO_INPUT);	/* DATA3 */
+
+	s3c_device_spi0.dev.platform_data = &spi_wlan_cfg,
+	platform_device_register(&s3c_device_spi0);
+
+#else /* CONFIG_AR6K_SPI_S3C24XX */
+
+	printk(KERN_INFO "SPI/MMC co-existence: disabling SPI\n");
+	s3c2410_gpio_cfgpin(S3C2410_GPE11, S3C2410_GPIO_INPUT);	/* MISO */
+	s3c2410_gpio_cfgpin(S3C2410_GPE12, S3C2410_GPIO_INPUT);	/* MOSI */
+	s3c2410_gpio_cfgpin(S3C2410_GPE13, S3C2410_GPIO_INPUT);	/* CLK */
+	s3c2410_gpio_cfgpin(S3C2410_GPF3, S3C2410_GPIO_INPUT);	/* EINT3 */
+	s3c2410_gpio_cfgpin(S3C2410_GPG2, S3C2410_GPIO_INPUT);	/* SS */
+
+#endif /* !CONFIG_AR6K_SPI_S3C24XX */
+
+	/* disable all pull-downs on SD/MMC and SPI  */
+
+	s3c2410_gpio_pullup(S3C2410_GPE5, 1);	/* SD/MMC block */
+	s3c2410_gpio_pullup(S3C2410_GPE6, 1);
+	s3c2410_gpio_pullup(S3C2410_GPE7, 1);
+	s3c2410_gpio_pullup(S3C2410_GPE8, 1);
+	s3c2410_gpio_pullup(S3C2410_GPE9, 1);
+	s3c2410_gpio_pullup(S3C2410_GPE10, 1);
+
+	s3c2410_gpio_pullup(S3C2410_GPE11, 1);	/* SPI block */
+	s3c2410_gpio_pullup(S3C2410_GPE12, 1);
+	s3c2410_gpio_pullup(S3C2410_GPE13, 1);
+	s3c2410_gpio_pullup(S3C2410_GPF3, 1);
+	s3c2410_gpio_pullup(S3C2410_GPG2, 1);
+
 //	platform_device_register(&s3c_device_spi_acc);
 	platform_device_register(&gta02_button_dev);
 	platform_device_register(&gta02_pm_gsm_dev);