[U-Boot] [PATCH 2/2] KB9202: Add NAND support
Matthias Kaehlcke
matthias at kaehlcke.net
Thu Jun 4 19:45:28 CEST 2009
El Wed, Jun 03, 2009 at 02:50:40PM -0500 Scott Wood ha dit:
> Matthias Kaehlcke wrote:
>> hi,
>>
>> El Fri, May 15, 2009 at 05:30:48PM -0500 Scott Wood ha dit:
>>
>>> Matthias Kaehlcke wrote:
>>>> +/*
>>>> + * Board-specific function to access the device ready signal.
>>>> + */
>>>> +static int kb9202_nand_ready(struct mtd_info *mtd)
>>>> +{
>>>> + return (((AT91C_BASE_PIOC->PIO_PDSR) & KB9202_NAND_BUSY) != 0);
>>>> +}
>>> Use I/O accessors.
> [snip]
>> + if (ctrl & NAND_NCE)
>> + AT91C_BASE_PIOC->PIO_CODR = KB9202_NAND_NCE;
>> + else
>> + AT91C_BASE_PIOC->PIO_SODR = KB9202_NAND_NCE;
>
> You're still not using I/O accessors in many places.
>
>> +#ifdef CONFIG_CMD_NAND
>
> Put this in the makefile instead.
>
>> +static int kb9202_nand_ready(struct mtd_info *mtd)
>> +{
>> + const unsigned int value = readl(AT91C_PIOC_PDSR);
>> +
>> + return ((value & KB9202_NAND_BUSY) != 0);
>> +}
>
> static int kb9202_nand_ready(struct mtd_info *mtd)
> {
> return readl(AT91C_PIOC_PDSR) & KB9202_NAND_BUSY;
> }
>
>> +int board_nand_init(struct nand_chip *nand)
>> +{
>> + unsigned int value;
>> + struct _AT91S_SMC2 *at91s_smc2 = AT91C_BASE_SMC2;
>> +
>> + nand->ecc.mode = NAND_ECC_SOFT;
>> + nand->options &= ~(NAND_BUSWIDTH_16);
>
> Unnecessary parens.
>
>> + nand->cmd_ctrl = kb9202_nand_hwcontrol;
>> + nand->dev_ready = kb9202_nand_ready;
>> +
>> + /* in case running outside of bootloader */
>> + AT91C_BASE_PMC->PMC_PCER = ((unsigned) 1 << AT91C_ID_PIOC);
>
> Unnecessary cast and parens.
>
>> + at91s_smc2->SMC2_CSR[3] =
>> + AT91C_SMC2_WSEN |
>> + (4 & AT91C_SMC2_NWS) |
>> + ((1 << 8) & AT91C_SMC2_TDF) |
>> + AT91C_SMC2_DBW_8 |
>> + ((1 << 24) & AT91C_SMC2_RWSETUP) |
>> + ((1 << 29) & AT91C_SMC2_RWHOLD);
>
> Are those instances of (constant1 & constant2) ever going to evaluate to
> anything but constant1? Can we get rid of the magic numbers?
>
> Otherwise, ACK.
thanks for your comments!
i hope this version of the patch addresses all your concerns
--
This is a forward port of the patch submitted by Christian from
Kwikbyte in 06/2007
(http://lists.denx.de/pipermail/u-boot/2007-June/022068.html)
Signed-off-by: Matthias Kaehlcke <matthias at kaehlcke.net>
---
board/kb9202/Makefile | 1 +
board/kb9202/nand.c | 151 ++++++++++++++++++++++++++
include/asm-arm/arch-at91rm9200/AT91RM9200.h | 2 +
include/configs/kb9202.h | 10 ++-
4 files changed, 163 insertions(+), 1 deletions(-)
create mode 100644 board/kb9202/nand.c
diff --git a/board/kb9202/Makefile b/board/kb9202/Makefile
index 363f665..d78454d 100644
--- a/board/kb9202/Makefile
+++ b/board/kb9202/Makefile
@@ -29,6 +29,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(BOARD).a
COBJS := kb9202.o
+COBJS-$(CONFIG_CMD_NAND) += nand.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
diff --git a/board/kb9202/nand.c b/board/kb9202/nand.c
new file mode 100644
index 0000000..7db8d7c
--- /dev/null
+++ b/board/kb9202/nand.c
@@ -0,0 +1,151 @@
+/*
+ * (C) Copyright 2006
+ * KwikByte <kb9200_dev at kwikbyte.com>
+ *
+ * (C) Copyright 2009
+ * Matthias Kaehlcke <matthias at 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->options &= ~NAND_BUSWIDTH_16;
+ 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);
+}
diff --git a/include/asm-arm/arch-at91rm9200/AT91RM9200.h b/include/asm-arm/arch-at91rm9200/AT91RM9200.h
index 00bae1c..2e40565 100644
--- a/include/asm-arm/arch-at91rm9200/AT91RM9200.h
+++ b/include/asm-arm/arch-at91rm9200/AT91RM9200.h
@@ -737,6 +737,7 @@ typedef struct _AT91S_PDC
#define AT91C_SMC2_ACSS_STANDARD ((unsigned int) 0x0 << 16) /* (SMC2) Standard, asserted at the beginning of the access and deasserted at the end. */
#define AT91C_SMC2_DBW_8 ((unsigned int) 0x2 << 13) /* (SMC2) 8-bit. */
#define AT91C_SMC2_WSEN ((unsigned int) 0x1 << 7) /* (SMC2) Wait State Enable */
+#define AT91C_PIOC_OER ((AT91_REG *) 0xFFFFF810) /* (PIOC) PIO Output Enable Register */
#define AT91C_PIOC_ASR ((AT91_REG *) 0xFFFFF870) /* (PIOC) Select A Register */
#define AT91C_PIOC_SODR ((AT91_REG *) 0xFFFFF830) /* (PIOC) Set Output Data Register */
#define AT91C_PIOC_CODR ((AT91_REG *) 0xFFFFF834) /* (PIOC) Clear Output Data Register */
@@ -790,6 +791,7 @@ typedef struct _AT91S_PDC
#define AT91C_MC_AASR 0xFFFFFF08
#define AT91C_EBI_CFGR 0xFFFFFF64
#define AT91C_SMC_CSR0 0xFFFFFF70
+#define AT91C_SMC_CSR3 0xFFFFFF7C
/* clocks */
#define AT91C_PLLAR 0xFFFFFC28
diff --git a/include/configs/kb9202.h b/include/configs/kb9202.h
index 8651e53..cd4c577 100644
--- a/include/configs/kb9202.h
+++ b/include/configs/kb9202.h
@@ -62,6 +62,11 @@
#ifdef CONFIG_KB9202B
#define CONFIG_BOOTARGS "console=ttyS0,115200 noinitrd root=/dev/mtdblock0 rootfstype=jffs2 mem=64M"
#define CONFIG_BOOTCOMMAND "bootm 0x10000000"
+#define NAND_MAX_CHIPS 1
+#define CONFIG_SYS_MAX_NAND_DEVICE 1
+#define CONFIG_SYS_NAND_BASE 0x40000000
+#define CONFIG_JFFS2_NAND
+#define CONFIG_JFFS2_CMDLINE
#endif
@@ -71,7 +76,7 @@
/*
* Size of malloc() pool
*/
-#define CONFIG_SYS_MALLOC_LEN (128*1024)
+#define CONFIG_SYS_MALLOC_LEN (1024*1024)
#define CONFIG_SYS_GBL_DATA_SIZE 128 /* size in bytes reserved for initial data */
#define CONFIG_BAUDRATE 115200
@@ -112,6 +117,9 @@
#define CONFIG_CMD_EEPROM
#define CONFIG_CMD_PING
#define CONFIG_CMD_DHCP
+#ifdef CONFIG_KB9202B
+#define CONFIG_CMD_NAND
+#endif
#define CONFIG_CMD_JFFS2
#undef CONFIG_CMD_BDI
--
1.6.3.1
--
Matthias Kaehlcke
Embedded Linux Engineer
Barcelona
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right to tell people what they do not want to hear
(George Orwell)
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