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Diffstat (limited to 'kernel/arch/cris/arch-v32/drivers/mach-a3/nandflash.c')
-rw-r--r--kernel/arch/cris/arch-v32/drivers/mach-a3/nandflash.c180
1 files changed, 180 insertions, 0 deletions
diff --git a/kernel/arch/cris/arch-v32/drivers/mach-a3/nandflash.c b/kernel/arch/cris/arch-v32/drivers/mach-a3/nandflash.c
new file mode 100644
index 000000000..7fb52128d
--- /dev/null
+++ b/kernel/arch/cris/arch-v32/drivers/mach-a3/nandflash.c
@@ -0,0 +1,180 @@
+/*
+ * arch/cris/arch-v32/drivers/nandflash.c
+ *
+ * Copyright (c) 2007
+ *
+ * Derived from drivers/mtd/nand/spia.c
+ * Copyright (C) 2000 Steven J. Hill (sjhill@realitydiluted.com)
+ *
+ * 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.
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <arch/memmap.h>
+#include <hwregs/reg_map.h>
+#include <hwregs/reg_rdwr.h>
+#include <hwregs/pio_defs.h>
+#include <pinmux.h>
+#include <asm/io.h>
+
+#define MANUAL_ALE_CLE_CONTROL 1
+
+#define regf_ALE a0
+#define regf_CLE a1
+#define regf_NCE ce0_n
+
+#define CLE_BIT 10
+#define ALE_BIT 11
+#define CE_BIT 12
+
+struct mtd_info_wrapper {
+ struct mtd_info info;
+ struct nand_chip chip;
+};
+
+/* Bitmask for control pins */
+#define PIN_BITMASK ((1 << CE_BIT) | (1 << CLE_BIT) | (1 << ALE_BIT))
+
+static struct mtd_info *crisv32_mtd;
+/*
+ * hardware specific access to control-lines
+ */
+static void crisv32_hwcontrol(struct mtd_info *mtd, int cmd,
+ unsigned int ctrl)
+{
+ unsigned long flags;
+ reg_pio_rw_dout dout;
+ struct nand_chip *this = mtd->priv;
+
+ local_irq_save(flags);
+
+ /* control bits change */
+ if (ctrl & NAND_CTRL_CHANGE) {
+ dout = REG_RD(pio, regi_pio, rw_dout);
+ dout.regf_NCE = (ctrl & NAND_NCE) ? 0 : 1;
+
+#if !MANUAL_ALE_CLE_CONTROL
+ if (ctrl & NAND_ALE) {
+ /* A0 = ALE high */
+ this->IO_ADDR_W = (void __iomem *)REG_ADDR(pio,
+ regi_pio, rw_io_access1);
+ } else if (ctrl & NAND_CLE) {
+ /* A1 = CLE high */
+ this->IO_ADDR_W = (void __iomem *)REG_ADDR(pio,
+ regi_pio, rw_io_access2);
+ } else {
+ /* A1 = CLE and A0 = ALE low */
+ this->IO_ADDR_W = (void __iomem *)REG_ADDR(pio,
+ regi_pio, rw_io_access0);
+ }
+#else
+
+ dout.regf_CLE = (ctrl & NAND_CLE) ? 1 : 0;
+ dout.regf_ALE = (ctrl & NAND_ALE) ? 1 : 0;
+#endif
+ REG_WR(pio, regi_pio, rw_dout, dout);
+ }
+
+ /* command to chip */
+ if (cmd != NAND_CMD_NONE)
+ writeb(cmd, this->IO_ADDR_W);
+
+ local_irq_restore(flags);
+}
+
+/*
+* read device ready pin
+*/
+static int crisv32_device_ready(struct mtd_info *mtd)
+{
+ reg_pio_r_din din = REG_RD(pio, regi_pio, r_din);
+ return din.rdy;
+}
+
+/*
+ * Main initialization routine
+ */
+struct mtd_info *__init crisv32_nand_flash_probe(void)
+{
+ void __iomem *read_cs;
+ void __iomem *write_cs;
+
+ struct mtd_info_wrapper *wrapper;
+ struct nand_chip *this;
+ int err = 0;
+
+ reg_pio_rw_man_ctrl man_ctrl = {
+ .regf_NCE = regk_pio_yes,
+#if MANUAL_ALE_CLE_CONTROL
+ .regf_ALE = regk_pio_yes,
+ .regf_CLE = regk_pio_yes
+#endif
+ };
+ reg_pio_rw_oe oe = {
+ .regf_NCE = regk_pio_yes,
+#if MANUAL_ALE_CLE_CONTROL
+ .regf_ALE = regk_pio_yes,
+ .regf_CLE = regk_pio_yes
+#endif
+ };
+ reg_pio_rw_dout dout = { .regf_NCE = 1 };
+
+ /* Allocate pio pins to pio */
+ crisv32_pinmux_alloc_fixed(pinmux_pio);
+ /* Set up CE, ALE, CLE (ce0_n, a0, a1) for manual control and output */
+ REG_WR(pio, regi_pio, rw_man_ctrl, man_ctrl);
+ REG_WR(pio, regi_pio, rw_dout, dout);
+ REG_WR(pio, regi_pio, rw_oe, oe);
+
+ /* Allocate memory for MTD device structure and private data */
+ wrapper = kzalloc(sizeof(struct mtd_info_wrapper), GFP_KERNEL);
+ if (!wrapper) {
+ printk(KERN_ERR "Unable to allocate CRISv32 NAND MTD "
+ "device structure.\n");
+ err = -ENOMEM;
+ return NULL;
+ }
+
+ read_cs = write_cs = (void __iomem *)REG_ADDR(pio, regi_pio,
+ rw_io_access0);
+
+ /* Get pointer to private data */
+ this = &wrapper->chip;
+ crisv32_mtd = &wrapper->info;
+
+ /* Link the private data with the MTD structure */
+ crisv32_mtd->priv = this;
+
+ /* Set address of NAND IO lines */
+ this->IO_ADDR_R = read_cs;
+ this->IO_ADDR_W = write_cs;
+ this->cmd_ctrl = crisv32_hwcontrol;
+ this->dev_ready = crisv32_device_ready;
+ /* 20 us command delay time */
+ this->chip_delay = 20;
+ this->ecc.mode = NAND_ECC_SOFT;
+
+ /* Enable the following for a flash based bad block table */
+ /* this->bbt_options = NAND_BBT_USE_FLASH; */
+
+ /* Scan to find existence of the device */
+ if (nand_scan(crisv32_mtd, 1)) {
+ err = -ENXIO;
+ goto out_mtd;
+ }
+
+ return crisv32_mtd;
+
+out_mtd:
+ kfree(wrapper);
+ return NULL;
+}
+