SPEAr : nand driver support for SPEAr SoCs

SPEAr SoCs contain an FSMC controller which can be used to interface
with a range of memories eg. NAND, SRAM, NOR.
Currently, this driver supports interfacing FSMC with NAND memories

Signed-off-by: Vipin <vipin.kumar@st.com>

diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 02449ee..28f27da 100644 (file)
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -47,6 +47,7 @@ COBJS-$(CONFIG_NAND_NDFC) += ndfc.o
 COBJS-$(CONFIG_NAND_NOMADIK) += nomadik.o
 COBJS-$(CONFIG_NAND_S3C2410) += s3c2410_nand.o
 COBJS-$(CONFIG_NAND_S3C64XX) += s3c64xx.o
+COBJS-$(CONFIG_NAND_SPEAR) += spr_nand.o
 COBJS-$(CONFIG_NAND_OMAP_GPMC) += omap_gpmc.o
 COBJS-$(CONFIG_NAND_PLAT) += nand_plat.o
 endif

diff --git a/drivers/mtd/nand/spr_nand.c b/drivers/mtd/nand/spr_nand.c
new file mode 100755 (executable)
index 0000000..097d0c6
--- /dev/null
+++ b/drivers/mtd/nand/spr_nand.c
@@ -0,0 +1,124 @@
+/*
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <nand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+#include <asm/arch/spr_nand.h>
+
+static struct fsmc_regs *const fsmc_regs_p =
+    (struct fsmc_regs *)CONFIG_SPEAR_FSMCBASE;
+
+static struct nand_ecclayout spear_nand_ecclayout = {
+       .eccbytes = 24,
+       .eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52,
+                  66, 67, 68, 82, 83, 84, 98, 99, 100, 114, 115, 116},
+       .oobfree = {
+                   {.offset = 8, .length = 8},
+                   {.offset = 24, .length = 8},
+                   {.offset = 40, .length = 8},
+                   {.offset = 56, .length = 8},
+                   {.offset = 72, .length = 8},
+                   {.offset = 88, .length = 8},
+                   {.offset = 104, .length = 8},
+                   {.offset = 120, .length = 8}
+                   }
+};
+
+static void spear_nand_hwcontrol(struct mtd_info *mtd, int cmd, uint ctrl)
+{
+       struct nand_chip *this = mtd->priv;
+       ulong IO_ADDR_W;
+
+       if (ctrl & NAND_CTRL_CHANGE) {
+               IO_ADDR_W = (ulong)this->IO_ADDR_W;
+
+               IO_ADDR_W &= ~(CONFIG_SYS_NAND_CLE | CONFIG_SYS_NAND_ALE);
+               if (ctrl & NAND_CLE)
+                       IO_ADDR_W |= CONFIG_SYS_NAND_CLE;
+               if (ctrl & NAND_ALE)
+                       IO_ADDR_W |= CONFIG_SYS_NAND_ALE;
+
+               if (ctrl & NAND_NCE) {
+                       writel(readl(&fsmc_regs_p->genmemctrl_pc) |
+                              FSMC_ENABLE, &fsmc_regs_p->genmemctrl_pc);
+               } else {
+                       writel(readl(&fsmc_regs_p->genmemctrl_pc) &
+                              ~FSMC_ENABLE, &fsmc_regs_p->genmemctrl_pc);
+               }
+               this->IO_ADDR_W = (void *)IO_ADDR_W;
+       }
+
+       if (cmd != NAND_CMD_NONE)
+               writeb(cmd, this->IO_ADDR_W);
+}
+
+static int spear_read_hwecc(struct mtd_info *mtd,
+                           const u_char *data, u_char ecc[3])
+{
+       u_int ecc_tmp;
+
+       /* read the h/w ECC */
+       ecc_tmp = readl(&fsmc_regs_p->genmemctrl_ecc);
+
+       ecc[0] = (u_char) (ecc_tmp & 0xFF);
+       ecc[1] = (u_char) ((ecc_tmp & 0xFF00) >> 8);
+       ecc[2] = (u_char) ((ecc_tmp & 0xFF0000) >> 16);
+
+       return 0;
+}
+
+void spear_enable_hwecc(struct mtd_info *mtd, int mode)
+{
+       writel(readl(&fsmc_regs_p->genmemctrl_pc) & ~0x80,
+              &fsmc_regs_p->genmemctrl_pc);
+       writel(readl(&fsmc_regs_p->genmemctrl_pc) & ~FSMC_ECCEN,
+              &fsmc_regs_p->genmemctrl_pc);
+       writel(readl(&fsmc_regs_p->genmemctrl_pc) | FSMC_ECCEN,
+              &fsmc_regs_p->genmemctrl_pc);
+}
+
+int spear_nand_init(struct nand_chip *nand)
+{
+       writel(FSMC_DEVWID_8 | FSMC_DEVTYPE_NAND | FSMC_ENABLE | FSMC_WAITON,
+              &fsmc_regs_p->genmemctrl_pc);
+       writel(readl(&fsmc_regs_p->genmemctrl_pc) | FSMC_TCLR_1 | FSMC_TAR_1,
+              &fsmc_regs_p->genmemctrl_pc);
+       writel(FSMC_THIZ_1 | FSMC_THOLD_4 | FSMC_TWAIT_6 | FSMC_TSET_0,
+              &fsmc_regs_p->genmemctrl_comm);
+       writel(FSMC_THIZ_1 | FSMC_THOLD_4 | FSMC_TWAIT_6 | FSMC_TSET_0,
+              &fsmc_regs_p->genmemctrl_attrib);
+
+       nand->options = 0;
+       nand->ecc.mode = NAND_ECC_HW;
+       nand->ecc.layout = &spear_nand_ecclayout;
+       nand->ecc.size = 512;
+       nand->ecc.bytes = 3;
+       nand->ecc.calculate = spear_read_hwecc;
+       nand->ecc.hwctl = spear_enable_hwecc;
+       nand->ecc.correct = nand_correct_data;
+       nand->cmd_ctrl = spear_nand_hwcontrol;
+       return 0;
+}

diff --git a/include/asm-arm/arch-spear/spr_nand.h b/include/asm-arm/arch-spear/spr_nand.h
new file mode 100644 (file)
index 0000000..2b63dc7
--- /dev/null
+++ b/include/asm-arm/arch-spear/spr_nand.h
@@ -0,0 +1,57 @@
+/*
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __SPR_NAND_H__
+#define __SPR_NAND_H__
+
+struct fsmc_regs {
+       u32 reserved_1[0x10];
+       u32 genmemctrl_pc;
+       u32 reserved_2;
+       u32 genmemctrl_comm;
+       u32 genmemctrl_attrib;
+       u32 reserved_3;
+       u32 genmemctrl_ecc;
+};
+
+/* genmemctrl_pc register definitions */
+#define FSMC_RESET             (1 << 0)
+#define FSMC_WAITON            (1 << 1)
+#define FSMC_ENABLE            (1 << 2)
+#define FSMC_DEVTYPE_NAND      (1 << 3)
+#define FSMC_DEVWID_8          (0 << 4)
+#define FSMC_DEVWID_16         (1 << 4)
+#define FSMC_ECCEN             (1 << 6)
+#define FSMC_ECCPLEN_512       (0 << 7)
+#define FSMC_ECCPLEN_256       (1 << 7)
+#define FSMC_TCLR_1            (1 << 9)
+#define FSMC_TAR_1             (1 << 13)
+
+/* genmemctrl_comm register definitions */
+#define FSMC_TSET_0            (0 << 0)
+#define FSMC_TWAIT_6           (6 << 8)
+#define FSMC_THOLD_4           (4 << 16)
+#define FSMC_THIZ_1            (1 << 24)
+
+extern int spear_nand_init(struct nand_chip *nand);
+#endif