Add KB9202 NAND driver
Signed-off-by: Matthias Kaehlcke <matth...@kaehlcke.net>
---
El Thu, Jul 16, 2009 at 01:45:57PM -0500 Scott Wood ha dit:
> On Sun, Jul 12, 2009 at 09:57:13PM +0200, Jean-Christophe PLAGNIOL-VILLARD
> wrote:
> > On 15:51 Wed 24 Jun , Scott Wood wrote:
> > > On Wed, Jun 24, 2009 at 05:23:05PM +0200, Matthias Kaehlcke wrote:
> > > > Add NAND support for the KwikByte KB9202
> > > >
> > > > Signed-off-by: Matthias Kaehlcke <matth...@kaehlcke.net>
> > > >
> > > > ---
> > > >
> > > > El Tue, Jun 23, 2009 at 04:19:40PM -0500 Scott Wood ha dit:
> > > >
> > > > > I get conflicts in kb9202.h. Is this against an arch tree, or does it
> > > > > need to be respun?
> > > >
> > > > The previous patches were against v2009-03, as i had problems
> > > > building the current git head for the kb9202 when i started working on
> > > > the patch. Did you apply the first patch of this series when you got
> > > > the conflict? This patch is based on the current HEAD.
> > >
> > > No - if it depends on other patches that go through an arch tree, then
> > > this
> > > patch should go through that tree as well.
> > >
> > > Acked-by: Scott Wood <scottw...@freescale.com>
> > Scott I've not follow this patch but for the arm part it's looks fine so
> > I'll
> > let you handle
>
> It still does not apply to the current tree, so I cannot accept it as is.
>
> The NAND tree is not an appropriate route for unrelated changes to a
> board config file (such as CONFIG_BOOTARGS/CONFIG_BOOTCOMMAND) to go --
> and even if it were, I don't have an easily applyable version of patch
> 1/2 (the mailing list archives mangle things).
>
> Matthias, can you resend a patch that just adds the NAND driver (for me),
> and a separate patch that just touches the board config (for the arch
> tree)?
ok, here is a patch that only adds the NAND driver. i'll prepare a
board config patch after my first patch has hit mainline to avoid
further confusion :)
changes regarding v5:
* only add the NAND driver, without touching the board configuration
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/kb9202_nand.c | 150 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 151 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/nand/kb9202_nand.c
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index a5680e8..aab3b70 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -40,6 +40,7 @@ COBJS-$(CONFIG_DRIVER_NAND_BFIN) += bfin_nand.o
COBJS-$(CONFIG_NAND_DAVINCI) += davinci_nand.o
COBJS-$(CONFIG_NAND_FSL_ELBC) += fsl_elbc_nand.o
COBJS-$(CONFIG_NAND_FSL_UPM) += fsl_upm.o
+COBJS-$(CONFIG_NAND_KB9202) += kb9202_nand.o
COBJS-$(CONFIG_NAND_KIRKWOOD) += kirkwood_nand.o
COBJS-$(CONFIG_NAND_MPC5121_NFC) += mpc5121_nfc.o
COBJS-$(CONFIG_NAND_NOMADIK) += nomadik.o
diff --git a/drivers/mtd/nand/kb9202_nand.c b/drivers/mtd/nand/kb9202_nand.c
new file mode 100644
index 0000000..b8f46fa
--- /dev/null
+++ b/drivers/mtd/nand/kb9202_nand.c
@@ -0,0 +1,150 @@
+/*
+ * (C) Copyright 2006
+ * KwikByte <kb9200_...@kwikbyte.com>
+ *
+ * (C) Copyright 2009
+ * Matthias Kaehlcke <matth...@kaehlcke.net>
+ *
+ * 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 <asm/io.h>
+#include <asm/arch/AT91RM9200.h>
+#include <asm/arch/hardware.h>
+
+#include <nand.h>
+
+/*
+ * hardware specific access to control-lines
+ */
+
+#define MASK_ALE (1 << 22) /* our ALE is A22 */
+#define MASK_CLE (1 << 21) /* our CLE is A21 */
+
+#define KB9202_NAND_NCE (1 << 28) /* EN* on D28 */
+#define KB9202_NAND_BUSY (1 << 29) /* RB* on D29 */
+
+#define KB9202_SMC2_NWS (1 << 2)
+#define KB9202_SMC2_TDF (1 << 8)
+#define KB9202_SMC2_RWSETUP (1 << 24)
+#define KB9202_SMC2_RWHOLD (1 << 29)
+
+/*
+ * Board-specific function to access device control signals
+ */
+static void kb9202_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int
ctrl)
+{
+ struct nand_chip *this = mtd->priv;
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+ ulong IO_ADDR_W = (ulong) this->IO_ADDR_W;
+
+ /* clear ALE and CLE bits */
+ IO_ADDR_W &= ~(MASK_ALE | MASK_CLE);
+
+ if (ctrl & NAND_CLE)
+ IO_ADDR_W |= MASK_CLE;
+
+ if (ctrl & NAND_ALE)
+ IO_ADDR_W |= MASK_ALE;
+
+ this->IO_ADDR_W = (void *) IO_ADDR_W;
+
+ if (ctrl & NAND_NCE)
+ writel(KB9202_NAND_NCE, AT91C_PIOC_CODR);
+ else
+ writel(KB9202_NAND_NCE, AT91C_PIOC_SODR);
+ }
+
+ if (cmd != NAND_CMD_NONE)
+ writeb(cmd, this->IO_ADDR_W);
+}
+
+
+/*
+ * Board-specific function to access the device ready signal.
+ */
+static int kb9202_nand_ready(struct mtd_info *mtd)
+{
+ return readl(AT91C_PIOC_PDSR) & KB9202_NAND_BUSY;
+}
+
+
+/*
+ * Board-specific NAND init. Copied from include/linux/mtd/nand.h for
reference.
+ *
+ * struct nand_chip - NAND Private Flash Chip Data
+ * @IO_ADDR_R: [BOARDSPECIFIC] address to read the 8 I/O lines of the
flash device
+ * @IO_ADDR_W: [BOARDSPECIFIC] address to write the 8 I/O lines of the
flash device
+ * @hwcontrol: [BOARDSPECIFIC] hardwarespecific function for accesing
control-lines
+ * @dev_ready: [BOARDSPECIFIC] hardwarespecific function for accesing
device ready/busy line
+ * If set to NULL no access to ready/busy is available and
the ready/busy information
+ * is read from the chip status register
+ * @enable_hwecc: [BOARDSPECIFIC] function to enable (reset) hardware ecc
generator. Must only
+ * be provided if a hardware ECC is available
+ * @eccmode: [BOARDSPECIFIC] mode of ecc, see defines
+ * @chip_delay: [BOARDSPECIFIC] chip dependent delay for
transfering data from array to read regs (tR)
+ * @options: [BOARDSPECIFIC] various chip options. They can partly
be set to inform nand_scan about
+ * special functionality. See the defines for further
explanation
+*/
+/*
+ * This routine initializes controller and GPIOs.
+ */
+int board_nand_init(struct nand_chip *nand)
+{
+ unsigned int value;
+
+ nand->ecc.mode = NAND_ECC_SOFT;
+ nand->cmd_ctrl = kb9202_nand_hwcontrol;
+ nand->dev_ready = kb9202_nand_ready;
+
+ /* in case running outside of bootloader */
+ writel(1 << AT91C_ID_PIOC, AT91C_PMC_PCER);
+
+ /* setup nand flash access (allow ample margin) */
+ /* 4 wait states, 1 setup, 1 hold, 1 float for 8-bit device */
+ writel(AT91C_SMC2_WSEN | KB9202_SMC2_NWS | KB9202_SMC2_TDF |
+ AT91C_SMC2_DBW_8 | KB9202_SMC2_RWSETUP | KB9202_SMC2_RWHOLD,
+ AT91C_SMC_CSR3);
+
+ /* enable internal NAND controller */
+ value = readl(AT91C_EBI_CSA);
+ value |= AT91C_EBI_CS3A_SMC_SmartMedia;
+ writel(value, AT91C_EBI_CSA);
+
+ /* enable SMOE/SMWE */
+ writel(AT91C_PC1_BFRDY_SMOE | AT91C_PC3_BFBAA_SMWE, AT91C_PIOC_ASR);
+ writel(AT91C_PC1_BFRDY_SMOE | AT91C_PC3_BFBAA_SMWE, AT91C_PIOC_PDR);
+ writel(AT91C_PC1_BFRDY_SMOE | AT91C_PC3_BFBAA_SMWE, AT91C_PIOC_OER);
+
+ /* set NCE to high */
+ writel(KB9202_NAND_NCE, AT91C_PIOC_SODR);
+
+ /* disable output on pin connected to the busy line of the NAND */
+ writel(KB9202_NAND_BUSY, AT91C_PIOC_ODR);
+
+ /* enable the PIO to control NCE and BUSY */
+ writel(KB9202_NAND_NCE | KB9202_NAND_BUSY, AT91C_PIOC_PER);
+
+ /* enable output for NCE */
+ writel(KB9202_NAND_NCE, AT91C_PIOC_OER);
+
+ return (0);
+}
--
Matthias Kaehlcke
Embedded Linux Engineer
Barcelona
Control over the use of one's ideas really constitutes control over other
people's lives; and it is usually used to make their lives more difficult.
(Richard Stallman)
.''`.
using free software / Debian GNU/Linux | http://debian.org : :' :
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