[PATCH 5/6] [ARM] pxa/balloon3: Add NAND driver
Marek Vasut
marek.vasut at gmail.com
Fri Jul 30 02:34:27 EDT 2010
The NAND support is implemented through the gen_nand driver.
Signed-off-by: Marek Vasut <marek.vasut at gmail.com>
---
arch/arm/mach-pxa/balloon3.c | 151 +++++++++++++++++++++++++++++
arch/arm/mach-pxa/include/mach/balloon3.h | 28 +++++-
2 files changed, 176 insertions(+), 3 deletions(-)
diff --git a/arch/arm/mach-pxa/balloon3.c b/arch/arm/mach-pxa/balloon3.c
index 6f594bd..e2eb0b7 100644
--- a/arch/arm/mach-pxa/balloon3.c
+++ b/arch/arm/mach-pxa/balloon3.c
@@ -27,6 +27,8 @@
#include <linux/mtd/partitions.h>
#include <linux/types.h>
#include <linux/i2c/pcf857x.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/physmap.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
@@ -530,6 +532,154 @@ static inline void balloon3_i2c_init(void) {}
#endif
/******************************************************************************
+ * NAND
+ ******************************************************************************/
+#if defined(CONFIG_MTD_NAND_PLATFORM)||defined(CONFIG_MTD_NAND_PLATFORM_MODULE)
+static uint16_t balloon3_ctl =
+ BALLOON3_NAND_CONTROL_FLCE0 | BALLOON3_NAND_CONTROL_FLCE1 |
+ BALLOON3_NAND_CONTROL_FLCE2 | BALLOON3_NAND_CONTROL_FLCE3 |
+ BALLOON3_NAND_CONTROL_FLWP;
+
+static void balloon3_nand_cmd_ctl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+ struct nand_chip *this = mtd->priv;
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+ if (ctrl & NAND_CLE)
+ balloon3_ctl |= BALLOON3_NAND_CONTROL_FLCLE;
+ else
+ balloon3_ctl &= ~BALLOON3_NAND_CONTROL_FLCLE;
+
+ if (ctrl & NAND_ALE)
+ balloon3_ctl |= BALLOON3_NAND_CONTROL_FLALE;
+ else
+ balloon3_ctl &= ~BALLOON3_NAND_CONTROL_FLALE;
+
+ __raw_writel(balloon3_ctl, BALLOON3_NAND_CONTROL_REG);
+ }
+
+ if (cmd != NAND_CMD_NONE)
+ writeb(cmd, this->IO_ADDR_W);
+}
+
+static void balloon3_nand_select_chip(struct mtd_info *mtd, int chip)
+{
+ if (chip < 0 || chip > 3)
+ return;
+
+ balloon3_ctl |= BALLOON3_NAND_CONTROL_FLCE0 |
+ BALLOON3_NAND_CONTROL_FLCE1 |
+ BALLOON3_NAND_CONTROL_FLCE2 |
+ BALLOON3_NAND_CONTROL_FLCE3;
+
+ /* Deassert correct nCE line */
+ balloon3_ctl &= ~(BALLOON3_NAND_CONTROL_FLCE0 << chip);
+
+ __raw_writew(balloon3_ctl, BALLOON3_NAND_CONTROL_REG);
+}
+
+static int balloon3_nand_probe(struct platform_device *pdev)
+{
+ void __iomem *temp_map;
+ uint16_t ver;
+ int ret;
+
+ __raw_writew(BALLOON3_NAND_CONTROL2_16BIT, BALLOON3_NAND_CONTROL2_REG);
+
+ ver = __raw_readw(BALLOON3_FPGA_VER);
+ if (ver > 0x0201)
+ pr_warn("The FPGA code, version 0x%04x, is newer than rel-0.3. "
+ "NAND support might be broken in this version!", ver);
+
+ /* Power up the NAND chips */
+ ret = gpio_request(BALLOON3_GPIO_RUN_NAND, "NAND");
+ if (ret)
+ goto err1;
+
+ ret = gpio_direction_output(BALLOON3_GPIO_RUN_NAND, 1);
+ if (ret)
+ goto err2;
+
+ gpio_set_value(BALLOON3_GPIO_RUN_NAND, 1);
+
+ /* Deassert all nCE lines and write protect line */
+ __raw_writel(balloon3_ctl, BALLOON3_NAND_CONTROL_REG);
+ return 0;
+
+err2:
+ gpio_free(BALLOON3_GPIO_RUN_NAND);
+err1:
+ return ret;
+}
+
+static void balloon3_nand_remove(struct platform_device *pdev)
+{
+ /* Power down the NAND chips */
+ gpio_set_value(BALLOON3_GPIO_RUN_NAND, 0);
+ gpio_free(BALLOON3_GPIO_RUN_NAND);
+}
+
+static struct mtd_partition balloon3_partition_info[] = {
+ [0] = {
+ .name = "Boot",
+ .offset = 0,
+ .size = SZ_4M,
+ },
+ [1] = {
+ .name = "RootFS",
+ .offset = MTDPART_OFS_APPEND,
+ .size = MTDPART_SIZ_FULL
+ },
+};
+
+static const char *balloon3_part_probes[] = { "cmdlinepart", NULL };
+
+struct platform_nand_data balloon3_nand_pdata = {
+ .chip = {
+ .nr_chips = 4,
+ .chip_offset = 0,
+ .nr_partitions = ARRAY_SIZE(balloon3_partition_info),
+ .partitions = balloon3_partition_info,
+ .chip_delay = 50,
+ .part_probe_types = balloon3_part_probes,
+ },
+ .ctrl = {
+ .hwcontrol = 0,
+ .dev_ready = 0,
+ .select_chip = balloon3_nand_select_chip,
+ .cmd_ctrl = balloon3_nand_cmd_ctl,
+ .probe = balloon3_nand_probe,
+ .remove = balloon3_nand_remove,
+ },
+};
+
+static struct resource balloon3_nand_resource[] = {
+ [0] = {
+ .start = BALLOON3_NAND_BASE,
+ .end = BALLOON3_NAND_BASE + 0x4,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct platform_device balloon3_nand = {
+ .name = "gen_nand",
+ .num_resources = ARRAY_SIZE(balloon3_nand_resource),
+ .resource = balloon3_nand_resource,
+ .id = -1,
+ .dev = {
+ .platform_data = &balloon3_nand_pdata,
+ }
+};
+
+static void __init balloon3_nand_init(void)
+{
+ platform_device_register(&balloon3_nand);
+}
+#else
+static inline void balloon3_nand_init(void) {}
+#endif
+
+/******************************************************************************
* Machine init
******************************************************************************/
static void __init balloon3_init(void)
@@ -547,6 +697,7 @@ static void __init balloon3_init(void)
balloon3_lcd_init();
balloon3_leds_init();
balloon3_mmc_init();
+ balloon3_nand_init();
balloon3_nor_init();
balloon3_ts_init();
balloon3_udc_init();
diff --git a/arch/arm/mach-pxa/include/mach/balloon3.h b/arch/arm/mach-pxa/include/mach/balloon3.h
index 238f887..eec92e6 100644
--- a/arch/arm/mach-pxa/include/mach/balloon3.h
+++ b/arch/arm/mach-pxa/include/mach/balloon3.h
@@ -31,12 +31,15 @@ enum balloon3_features {
#define BALLOON3_CF_CONTROL_REG (BALLOON3_FPGA_VIRT + 0x00e00008)
/* FPGA / CPLD version register */
#define BALLOON3_FPGA_VER (BALLOON3_FPGA_VIRT + 0x00e0001c)
+/* FPGA / CPLD registers for NAND flash */
+#define BALLOON3_NAND_BASE (PXA_CS4_PHYS + 0x00e00000)
+#define BALLOON3_NAND_IO_REG (BALLOON3_FPGA_VIRT + 0x00e00000)
+#define BALLOON3_NAND_CONTROL2_REG (BALLOON3_FPGA_VIRT + 0x00e00010)
+#define BALLOON3_NAND_STAT_REG (BALLOON3_FPGA_VIRT + 0x00e00010)
+#define BALLOON3_NAND_CONTROL_REG (BALLOON3_FPGA_VIRT + 0x00e00014)
-#define BALLOON3_NANDIO_IO_REG (BALLOON3_FPGA_VIRT + 0x00e00000)
/* fpga/cpld interrupt control register */
#define BALLOON3_INT_CONTROL_REG (BALLOON3_FPGA_VIRT + 0x00e0000C)
-#define BALLOON3_NANDIO_CTL2_REG (BALLOON3_FPGA_VIRT + 0x00e00010)
-#define BALLOON3_NANDIO_CTL_REG (BALLOON3_FPGA_VIRT + 0x00e00014)
#define BALLOON3_VERSION_REG (BALLOON3_FPGA_VIRT + 0x00e0001c)
#define BALLOON3_SAMOSA_ADDR_REG (BALLOON3_FPGA_VIRT + 0x00c00000)
@@ -56,6 +59,22 @@ enum balloon3_features {
#define BALLOON3_BP_CF_NRDY_IRQ BALLOON3_IRQ(0)
#define BALLOON3_BP_NSTSCHG_IRQ BALLOON3_IRQ(1)
+/* NAND Control register */
+#define BALLOON3_NAND_CONTROL_FLWP (1 << 7)
+#define BALLOON3_NAND_CONTROL_FLSE (1 << 6)
+#define BALLOON3_NAND_CONTROL_FLCE3 (1 << 5)
+#define BALLOON3_NAND_CONTROL_FLCE2 (1 << 4)
+#define BALLOON3_NAND_CONTROL_FLCE1 (1 << 3)
+#define BALLOON3_NAND_CONTROL_FLCE0 (1 << 2)
+#define BALLOON3_NAND_CONTROL_FLALE (1 << 1)
+#define BALLOON3_NAND_CONTROL_FLCLE (1 << 0)
+
+/* NAND Status register */
+#define BALLOON3_NAND_STAT_RNB (1 << 0)
+
+/* NAND Control2 register */
+#define BALLOON3_NAND_CONTROL2_16BIT (1 << 0)
+
/* GPIOs for irqs */
#define BALLOON3_GPIO_AUX_NIRQ (94)
#define BALLOON3_GPIO_CODEC_IRQ (95)
@@ -69,6 +88,9 @@ enum balloon3_features {
#define BALLOON3_GPIO_S0_CD (105)
+/* NAND */
+#define BALLOON3_GPIO_RUN_NAND (102)
+
/* PCF8574A Leds */
#define BALLOON3_PCF_GPIO_BASE 160
#define BALLOON3_PCF_GPIO_LED0 (BALLOON3_PCF_GPIO_BASE + 0)
--
1.7.1
More information about the linux-arm-kernel
mailing list