add new target 'oxnas'

[openwrt.git] / target / linux / oxnas / files / drivers / mtd / nand / oxnas_nand.c

diff --git a/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c b/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c
new file mode 100644 (file)
index 0000000..55eb009
--- /dev/null
+++ b/target/linux/oxnas/files/drivers/mtd/nand/oxnas_nand.c
@@ -0,0 +1,102 @@
+/*
+ *  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/module.h>
+#include <linux/mtd/nand.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <mach/utils.h>
+
+/* nand commands */
+#define NAND_CMD_ALE           BIT(18)
+#define NAND_CMD_CLE           BIT(19)
+#define NAND_CMD_CS            0
+#define NAND_CMD_RESET         0xff
+#define NAND_CMD               (NAND_CMD_CS | NAND_CMD_CLE)
+#define NAND_ADDR              (NAND_CMD_CS | NAND_CMD_ALE)
+#define NAND_DATA              (NAND_CMD_CS)
+
+static void oxnas_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+       struct nand_chip *this = mtd->priv;
+       unsigned long nandaddr = (unsigned long) this->IO_ADDR_W;
+
+       if (ctrl & NAND_CTRL_CHANGE) {
+               nandaddr &= ~(NAND_CMD | NAND_ADDR);
+               if (ctrl & NAND_CLE)
+                       nandaddr |= NAND_CMD;
+               else if (ctrl & NAND_ALE)
+                       nandaddr |= NAND_ADDR;
+               this->IO_ADDR_W = (void __iomem *) nandaddr;
+       }
+
+       if (cmd != NAND_CMD_NONE)
+               writeb(cmd, (void __iomem *) nandaddr);
+}
+
+static int oxnas_nand_probe(struct platform_device *pdev)
+{
+       /* enable clock and release static block reset */
+       struct clk *clk = of_clk_get(pdev->dev.of_node, 0);
+
+       if (IS_ERR(clk))
+               return PTR_ERR(clk);
+
+       clk_prepare_enable(clk);
+       device_reset(&pdev->dev);
+
+       return 0;
+}
+
+/* allow users to override the partition in DT using the cmdline */
+static const char * part_probes[] = { "cmdlinepart", "ofpart", NULL };
+
+static struct platform_nand_data oxnas_nand_data = {
+       .chip = {
+               .nr_chips               = 1,
+               .chip_delay             = 30,
+               .part_probe_types       = part_probes,
+       },
+       .ctrl = {
+               .probe          = oxnas_nand_probe,
+               .cmd_ctrl       = oxnas_cmd_ctrl,
+       }
+};
+
+/*
+ * Try to find the node inside the DT. If it is available attach out
+ * platform_nand_data
+ */
+static int __init oxnas_register_nand(void)
+{
+       struct device_node *node;
+       struct platform_device *pdev;
+
+       node = of_find_compatible_node(NULL, NULL, "plxtech,nand-nas782x");
+       if (!node)
+               return -ENOENT;
+       pdev = of_find_device_by_node(node);
+       if (!pdev)
+               return -EINVAL;
+       pdev->dev.platform_data = &oxnas_nand_data;
+       of_node_put(node);
+       return 0;
+}
+
+subsys_initcall(oxnas_register_nand);
+
+static const struct of_device_id oxnas_nand_ids[] = {
+       { .compatible = "plxtech,nand-nas782x"},
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, oxnas_nand_ids);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ma Haijun");
+MODULE_DESCRIPTION("NAND glue for Oxnas platforms");
+MODULE_ALIAS("platform:oxnas_nand");