Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / cris / arch-v32 / drivers / mach-a3 / nandflash.c

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 (file)
index 0000000..7fb5212
--- /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;
+}
+