SUNXI NFC MTD driver

drivers/mtd/nand/Kconfig

@@ -122,6 +122,12 @@ config MTD_NAND_OMAP2
           Support for NAND flash on Texas Instruments OMAP2, OMAP3 and OMAP4
 	  platforms.
 
+config MTD_NAND_SUNXI
+	tristate "NAND Flash device on Allwinner A10"
+	depends on ARCH_SUN4I
+	help
+          Support for NAND flash on Allwinner A10
+
 config MTD_NAND_RICOH
 	tristate "Ricoh xD card reader"
 	default n

drivers/mtd/nand/Makefile

@@ -51,5 +51,6 @@ obj-$(CONFIG_MTD_NAND_MPC5121_NFC)	+= mpc5121_nfc.o
 obj-$(CONFIG_MTD_NAND_RICOH)		+= r852.o
 obj-$(CONFIG_MTD_NAND_JZ4740)		+= jz4740_nand.o
 obj-$(CONFIG_MTD_NAND_GPMI_NAND)	+= gpmi-nand/
+obj-$(CONFIG_MTD_NAND_SUNXI)        += sunxi-nand/
 
 nand-objs := nand_base.o nand_bbt.o

drivers/mtd/nand/sunxi-nand/Kbuild

@@ -0,0 +1,4 @@
+obj-$(CONFIG_MTD_NAND_SUNXI) += sunxi_nand.o
+sunxi_nand-objs += main.o nfc.o dma.o nand_id.o nand1k.o
+
+ccflags-y = -D__LINUX__

drivers/mtd/nand/sunxi-nand/defs.h

@@ -0,0 +1,39 @@
+/*
+ * defs.h
+ *
+ * Copyright (C) 2013 Qiang Yu <yuq825@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SUNXI_DEFS_H
+#define _SUNXI_DEFS_H
+
+#define PREFIX "[MTD][NAND][SUNXI]: "
+
+#ifdef __LINUX__
+
+#include <linux/kernel.h>
+
+#define DBG_INFO(fmt, ...) printk(KERN_INFO PREFIX fmt, ##__VA_ARGS__)
+#define ERR_INFO(fmt, ...) printk(KERN_ERR PREFIX fmt, ##__VA_ARGS__)
+
+#else /* !__LINUX__ */
+
+#define DBG_INFO(fmt, ...)
+#define ERR_INFO(fmt, ...)
+
+#endif
+
+#endif

drivers/mtd/nand/sunxi-nand/dma.c

@@ -0,0 +1,116 @@
+/*
+ * dma.c
+ *
+ * Copyright (C) 2013 Qiang Yu <yuq825@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mach/dma.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <asm/cacheflush.h>
+
+#include "defs.h"
+
+static int nanddma_completed_flag = 1;
+static DECLARE_WAIT_QUEUE_HEAD(DMA_wait);
+
+static struct sw_dma_client nand_dma_client = {
+	.name="NAND_DMA",
+};
+
+static void nanddma_buffdone(struct sw_dma_chan * ch, void *buf, int size, enum sw_dma_buffresult result)
+{
+	nanddma_completed_flag = 1;
+	wake_up(&DMA_wait);
+	//DBG_INFO("buffer done. nanddma_completed_flag: %d\n", nanddma_completed_flag);
+}
+
+static int nanddma_opfn(struct sw_dma_chan * ch,   enum sw_chan_op op_code)
+{
+	if(op_code == SW_DMAOP_START)
+		nanddma_completed_flag = 0;
+
+	//DBG_INFO("buffer opfn: %d, nanddma_completed_flag: %d\n", (int)op_code, nanddma_completed_flag);
+
+	return 0;
+}
+
+int dma_nand_request(unsigned int dmatype)
+{
+	int ch;
+
+	ch = sw_dma_request(DMACH_DNAND, &nand_dma_client, NULL);
+	if(ch < 0)
+		return ch;
+
+	sw_dma_set_opfn(ch, nanddma_opfn);
+	sw_dma_set_buffdone_fn(ch, nanddma_buffdone);
+
+	return ch;
+}
+
+int dma_nand_release(int hDma)
+{
+	return sw_dma_free(hDma, &nand_dma_client);
+}
+
+
+static int dma_set(int hDMA, void *pArg)
+{
+	sw_dma_setflags(hDMA, SW_DMAF_AUTOSTART);
+	return sw_dma_config(hDMA, (struct dma_hw_conf*)pArg);
+}
+
+
+static int dma_enqueue(int hDma, unsigned int buff_addr, size_t len)
+{
+	static int seq=0;
+	__cpuc_flush_dcache_area((void *)buff_addr, len + (1 << 5) * 2 - 2);
+	nanddma_completed_flag = 0;
+	return sw_dma_enqueue(hDma, (void*)(seq++), buff_addr, len);
+}
+
+void dma_nand_config_start(int dma, int rw, unsigned int buff_addr, size_t len)
+{
+	struct dma_hw_conf nand_hwconf = {
+		.xfer_type = DMAXFER_D_BWORD_S_BWORD,
+		.hf_irq = SW_DMA_IRQ_FULL,
+		.cmbk = 0x7f077f07,
+	};
+
+	nand_hwconf.dir = rw + 1;
+
+	if(rw == 0) {
+		nand_hwconf.from = 0x01C03030,
+		nand_hwconf.address_type = DMAADDRT_D_LN_S_IO,
+		nand_hwconf.drqsrc_type = DRQ_TYPE_NAND;
+	}
+	else {
+		nand_hwconf.to = 0x01C03030,
+		nand_hwconf.address_type = DMAADDRT_D_IO_S_LN,
+		nand_hwconf.drqdst_type = DRQ_TYPE_NAND;
+	}
+
+	dma_set(dma, (void*)&nand_hwconf);
+	dma_enqueue(dma, buff_addr, len);
+}
+
+int dma_nand_wait_finish(void)
+{
+	wait_event(DMA_wait, nanddma_completed_flag);
+    return 0;
+}
+

drivers/mtd/nand/sunxi-nand/dma.h

@@ -0,0 +1,29 @@
+/*
+ * dma.h
+ *
+ * Copyright (C) 2013 Qiang Yu <yuq825@gmail.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SUNXI_NAND_DMA_H
+#define _SUNXI_NAND_DMA_H
+
+int dma_nand_request(unsigned int dmatype);
+int dma_nand_release(int hDma);
+void dma_nand_config_start(int dma, int rw, unsigned int buff_addr, size_t len);
+int dma_nand_wait_finish(void);
+
+#endif
+