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openwrt-owl/target/linux/ath25/patches-3.18/120-spiflash.patch

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--- a/drivers/mtd/devices/Kconfig
+++ b/drivers/mtd/devices/Kconfig
@@ -120,6 +120,10 @@ config MTD_BCM47XXSFLASH
registered by bcma as platform devices. This enables driver for
serial flash memories (only read-only mode is implemented).
+config MTD_AR2315
+ tristate "Atheros AR2315+ SPI Flash support"
+ depends on SOC_AR2315
+
config MTD_SLRAM
tristate "Uncached system RAM"
help
--- a/drivers/mtd/devices/Makefile
+++ b/drivers/mtd/devices/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_MTD_DATAFLASH) += mtd_dataf
obj-$(CONFIG_MTD_M25P80) += m25p80.o
obj-$(CONFIG_MTD_SPEAR_SMI) += spear_smi.o
obj-$(CONFIG_MTD_SST25L) += sst25l.o
+obj-$(CONFIG_MTD_AR2315) += ar2315.o
obj-$(CONFIG_MTD_BCM47XXSFLASH) += bcm47xxsflash.o
obj-$(CONFIG_MTD_ST_SPI_FSM) += st_spi_fsm.o
--- /dev/null
+++ b/drivers/mtd/devices/ar2315.c
@@ -0,0 +1,459 @@
+
+/*
+ * MTD driver for the SPI Flash Memory support on Atheros AR2315
+ *
+ * Copyright (c) 2005-2006 Atheros Communications Inc.
+ * Copyright (C) 2006-2007 FON Technology, SL.
+ * Copyright (C) 2006-2007 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2012 Alexandros C. Couloumbis <alex@ozo.com>
+ *
+ * This code 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/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/mutex.h>
+
+#include "ar2315_spiflash.h"
+
+#define DRIVER_NAME "ar2315-spiflash"
+
+#define busy_wait(_priv, _condition, _wait) do { \
+ while (_condition) { \
+ if (_wait > 1) \
+ msleep(_wait); \
+ else if ((_wait == 1) && need_resched()) \
+ schedule(); \
+ else \
+ udelay(1); \
+ } \
+} while (0)
+
+enum {
+ FLASH_NONE,
+ FLASH_1MB,
+ FLASH_2MB,
+ FLASH_4MB,
+ FLASH_8MB,
+ FLASH_16MB,
+};
+
+/* Flash configuration table */
+struct flashconfig {
+ u32 byte_cnt;
+ u32 sector_cnt;
+ u32 sector_size;
+};
+
+static const struct flashconfig flashconfig_tbl[] = {
+ [FLASH_NONE] = { 0, 0, 0},
+ [FLASH_1MB] = { STM_1MB_BYTE_COUNT, STM_1MB_SECTOR_COUNT,
+ STM_1MB_SECTOR_SIZE},
+ [FLASH_2MB] = { STM_2MB_BYTE_COUNT, STM_2MB_SECTOR_COUNT,
+ STM_2MB_SECTOR_SIZE},
+ [FLASH_4MB] = { STM_4MB_BYTE_COUNT, STM_4MB_SECTOR_COUNT,
+ STM_4MB_SECTOR_SIZE},
+ [FLASH_8MB] = { STM_8MB_BYTE_COUNT, STM_8MB_SECTOR_COUNT,
+ STM_8MB_SECTOR_SIZE},
+ [FLASH_16MB] = { STM_16MB_BYTE_COUNT, STM_16MB_SECTOR_COUNT,
+ STM_16MB_SECTOR_SIZE}
+};
+
+/* Mapping of generic opcodes to STM serial flash opcodes */
+enum {
+ SPI_WRITE_ENABLE,
+ SPI_WRITE_DISABLE,
+ SPI_RD_STATUS,
+ SPI_WR_STATUS,
+ SPI_RD_DATA,
+ SPI_FAST_RD_DATA,
+ SPI_PAGE_PROGRAM,
+ SPI_SECTOR_ERASE,
+ SPI_BULK_ERASE,
+ SPI_DEEP_PWRDOWN,
+ SPI_RD_SIG,
+};
+
+struct opcodes {
+ __u16 code;
+ __s8 tx_cnt;
+ __s8 rx_cnt;
+};
+
+static const struct opcodes stm_opcodes[] = {
+ [SPI_WRITE_ENABLE] = {STM_OP_WR_ENABLE, 1, 0},
+ [SPI_WRITE_DISABLE] = {STM_OP_WR_DISABLE, 1, 0},
+ [SPI_RD_STATUS] = {STM_OP_RD_STATUS, 1, 1},
+ [SPI_WR_STATUS] = {STM_OP_WR_STATUS, 1, 0},
+ [SPI_RD_DATA] = {STM_OP_RD_DATA, 4, 4},
+ [SPI_FAST_RD_DATA] = {STM_OP_FAST_RD_DATA, 5, 0},
+ [SPI_PAGE_PROGRAM] = {STM_OP_PAGE_PGRM, 8, 0},
+ [SPI_SECTOR_ERASE] = {STM_OP_SECTOR_ERASE, 4, 0},
+ [SPI_BULK_ERASE] = {STM_OP_BULK_ERASE, 1, 0},
+ [SPI_DEEP_PWRDOWN] = {STM_OP_DEEP_PWRDOWN, 1, 0},
+ [SPI_RD_SIG] = {STM_OP_RD_SIG, 4, 1},
+};
+
+/* Driver private data structure */
+struct spiflash_priv {
+ struct mtd_info mtd;
+ void __iomem *readaddr; /* memory mapped data for read */
+ void __iomem *mmraddr; /* memory mapped register space */
+ struct mutex lock; /* serialize registers access */
+};
+
+#define to_spiflash(_mtd) container_of(_mtd, struct spiflash_priv, mtd)
+
+enum {
+ FL_READY,
+ FL_READING,
+ FL_ERASING,
+ FL_WRITING
+};
+
+/*****************************************************************************/
+
+static u32
+spiflash_read_reg(struct spiflash_priv *priv, int reg)
+{
+ return ioread32(priv->mmraddr + reg);
+}
+
+static void
+spiflash_write_reg(struct spiflash_priv *priv, int reg, u32 data)
+{
+ iowrite32(data, priv->mmraddr + reg);
+}
+
+static u32
+spiflash_wait_busy(struct spiflash_priv *priv)
+{
+ u32 reg;
+
+ busy_wait(priv, (reg = spiflash_read_reg(priv, SPI_FLASH_CTL)) &
+ SPI_CTL_BUSY, 0);
+ return reg;
+}
+
+static u32
+spiflash_sendcmd(struct spiflash_priv *priv, int opcode, u32 addr)
+{
+ const struct opcodes *op;
+ u32 reg, mask;
+
+ op = &stm_opcodes[opcode];
+ reg = spiflash_wait_busy(priv);
+ spiflash_write_reg(priv, SPI_FLASH_OPCODE,
+ ((u32)op->code) | (addr << 8));
+
+ reg &= ~SPI_CTL_TX_RX_CNT_MASK;
+ reg |= SPI_CTL_START | op->tx_cnt | (op->rx_cnt << 4);
+
+ spiflash_write_reg(priv, SPI_FLASH_CTL, reg);
+ spiflash_wait_busy(priv);
+
+ if (!op->rx_cnt)
+ return 0;
+
+ reg = spiflash_read_reg(priv, SPI_FLASH_DATA);
+
+ switch (op->rx_cnt) {
+ case 1:
+ mask = 0x000000ff;
+ break;
+ case 2:
+ mask = 0x0000ffff;
+ break;
+ case 3:
+ mask = 0x00ffffff;
+ break;
+ default:
+ mask = 0xffffffff;
+ break;
+ }
+ reg &= mask;
+
+ return reg;
+}
+
+/*
+ * Probe SPI flash device
+ * Function returns 0 for failure.
+ * and flashconfig_tbl array index for success.
+ */
+static int
+spiflash_probe_chip(struct platform_device *pdev, struct spiflash_priv *priv)
+{
+ u32 sig = spiflash_sendcmd(priv, SPI_RD_SIG, 0);
+ int flash_size;
+
+ switch (sig) {
+ case STM_8MBIT_SIGNATURE:
+ flash_size = FLASH_1MB;
+ break;
+ case STM_16MBIT_SIGNATURE:
+ flash_size = FLASH_2MB;
+ break;
+ case STM_32MBIT_SIGNATURE:
+ flash_size = FLASH_4MB;
+ break;
+ case STM_64MBIT_SIGNATURE:
+ flash_size = FLASH_8MB;
+ break;
+ case STM_128MBIT_SIGNATURE:
+ flash_size = FLASH_16MB;
+ break;
+ default:
+ dev_warn(&pdev->dev, "read of flash device signature failed!\n");
+ return 0;
+ }
+
+ return flash_size;
+}
+
+static void
+spiflash_wait_complete(struct spiflash_priv *priv, unsigned int timeout)
+{
+ busy_wait(priv, spiflash_sendcmd(priv, SPI_RD_STATUS, 0) &
+ SPI_STATUS_WIP, timeout);
+}
+
+static int
+spiflash_erase(struct mtd_info *mtd, struct erase_info *instr)
+{
+ struct spiflash_priv *priv = to_spiflash(mtd);
+ const struct opcodes *op;
+ u32 temp, reg;
+
+ if (instr->addr + instr->len > mtd->size)
+ return -EINVAL;
+
+ mutex_lock(&priv->lock);
+
+ spiflash_sendcmd(priv, SPI_WRITE_ENABLE, 0);
+ reg = spiflash_wait_busy(priv);
+
+ op = &stm_opcodes[SPI_SECTOR_ERASE];
+ temp = ((u32)instr->addr << 8) | (u32)(op->code);
+ spiflash_write_reg(priv, SPI_FLASH_OPCODE, temp);
+
+ reg &= ~SPI_CTL_TX_RX_CNT_MASK;
+ reg |= op->tx_cnt | SPI_CTL_START;
+ spiflash_write_reg(priv, SPI_FLASH_CTL, reg);
+
+ spiflash_wait_complete(priv, 20);
+
+ mutex_unlock(&priv->lock);
+
+ instr->state = MTD_ERASE_DONE;
+ mtd_erase_callback(instr);
+
+ return 0;
+}
+
+static int
+spiflash_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
+ u_char *buf)
+{
+ struct spiflash_priv *priv = to_spiflash(mtd);
+
+ if (!len)
+ return 0;
+
+ if (from + len > mtd->size)
+ return -EINVAL;
+
+ *retlen = len;
+
+ mutex_lock(&priv->lock);
+
+ memcpy_fromio(buf, priv->readaddr + from, len);
+
+ mutex_unlock(&priv->lock);
+
+ return 0;
+}
+
+static int
+spiflash_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
+ const u8 *buf)
+{
+ struct spiflash_priv *priv = to_spiflash(mtd);
+ u32 opcode, bytes_left;
+
+ *retlen = 0;
+
+ if (!len)
+ return 0;
+
+ if (to + len > mtd->size)
+ return -EINVAL;
+
+ bytes_left = len;
+
+ do {
+ u32 read_len, reg, page_offset, spi_data = 0;
+
+ read_len = min(bytes_left, sizeof(u32));
+
+ /* 32-bit writes cannot span across a page boundary
+ * (256 bytes). This types of writes require two page
+ * program operations to handle it correctly. The STM part
+ * will write the overflow data to the beginning of the
+ * current page as opposed to the subsequent page.
+ */
+ page_offset = (to & (STM_PAGE_SIZE - 1)) + read_len;
+
+ if (page_offset > STM_PAGE_SIZE)
+ read_len -= (page_offset - STM_PAGE_SIZE);
+
+ mutex_lock(&priv->lock);
+
+ spiflash_sendcmd(priv, SPI_WRITE_ENABLE, 0);
+ spi_data = 0;
+ switch (read_len) {
+ case 4:
+ spi_data |= buf[3] << 24;
+ /* fall through */
+ case 3:
+ spi_data |= buf[2] << 16;
+ /* fall through */
+ case 2:
+ spi_data |= buf[1] << 8;
+ /* fall through */
+ case 1:
+ spi_data |= buf[0] & 0xff;
+ break;
+ default:
+ break;
+ }
+
+ spiflash_write_reg(priv, SPI_FLASH_DATA, spi_data);
+ opcode = stm_opcodes[SPI_PAGE_PROGRAM].code |
+ (to & 0x00ffffff) << 8;
+ spiflash_write_reg(priv, SPI_FLASH_OPCODE, opcode);
+
+ reg = spiflash_read_reg(priv, SPI_FLASH_CTL);
+ reg &= ~SPI_CTL_TX_RX_CNT_MASK;
+ reg |= (read_len + 4) | SPI_CTL_START;
+ spiflash_write_reg(priv, SPI_FLASH_CTL, reg);
+
+ spiflash_wait_complete(priv, 1);
+
+ mutex_unlock(&priv->lock);
+
+ bytes_left -= read_len;
+ to += read_len;
+ buf += read_len;
+
+ *retlen += read_len;
+ } while (bytes_left != 0);
+
+ return 0;
+}
+
+#if defined CONFIG_MTD_REDBOOT_PARTS || CONFIG_MTD_MYLOADER_PARTS
+static const char * const part_probe_types[] = {
+ "cmdlinepart", "RedBoot", "MyLoader", NULL
+};
+#endif
+
+static int
+spiflash_probe(struct platform_device *pdev)
+{
+ struct spiflash_priv *priv;
+ struct mtd_info *mtd;
+ struct resource *res;
+ int index;
+ int result = 0;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ mutex_init(&priv->lock);
+ mtd = &priv->mtd;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ priv->mmraddr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->mmraddr)) {
+ dev_warn(&pdev->dev, "failed to map flash MMR\n");
+ return PTR_ERR(priv->mmraddr);
+ }
+
+ index = spiflash_probe_chip(pdev, priv);
+ if (!index) {
+ dev_warn(&pdev->dev, "found no flash device\n");
+ return -ENODEV;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->readaddr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->readaddr)) {
+ dev_warn(&pdev->dev, "failed to map flash read mem\n");
+ return PTR_ERR(priv->readaddr);
+ }
+
+ platform_set_drvdata(pdev, priv);
+ mtd->name = "spiflash";
+ mtd->type = MTD_NORFLASH;
+ mtd->flags = (MTD_CAP_NORFLASH|MTD_WRITEABLE);
+ mtd->size = flashconfig_tbl[index].byte_cnt;
+ mtd->erasesize = flashconfig_tbl[index].sector_size;
+ mtd->writesize = 1;
+ mtd->numeraseregions = 0;
+ mtd->eraseregions = NULL;
+ mtd->_erase = spiflash_erase;
+ mtd->_read = spiflash_read;
+ mtd->_write = spiflash_write;
+ mtd->owner = THIS_MODULE;
+
+ dev_info(&pdev->dev, "%lld Kbytes flash detected\n", mtd->size >> 10);
+
+#if defined CONFIG_MTD_REDBOOT_PARTS || CONFIG_MTD_MYLOADER_PARTS
+ /* parse redboot partitions */
+
+ result = mtd_device_parse_register(mtd, part_probe_types,
+ NULL, NULL, 0);
+#endif
+
+ return result;
+}
+
+static int
+spiflash_remove(struct platform_device *pdev)
+{
+ struct spiflash_priv *priv = platform_get_drvdata(pdev);
+
+ mtd_device_unregister(&priv->mtd);
+
+ return 0;
+}
+
+static struct platform_driver spiflash_driver = {
+ .driver.name = DRIVER_NAME,
+ .probe = spiflash_probe,
+ .remove = spiflash_remove,
+};
+
+module_platform_driver(spiflash_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("OpenWrt.org");
+MODULE_AUTHOR("Atheros Communications Inc");
+MODULE_DESCRIPTION("MTD driver for SPI Flash on Atheros AR2315+ SOC");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+
--- /dev/null
+++ b/drivers/mtd/devices/ar2315_spiflash.h
@@ -0,0 +1,106 @@
+/*
+ * Atheros AR2315 SPI Flash Memory support header file.
+ *
+ * Copyright (c) 2005, Atheros Communications Inc.
+ * Copyright (C) 2006 FON Technology, SL.
+ * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This code 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.
+ *
+ */
+#ifndef __AR2315_SPIFLASH_H
+#define __AR2315_SPIFLASH_H
+
+#define STM_PAGE_SIZE 256
+
+#define SFI_WRITE_BUFFER_SIZE 4
+#define SFI_FLASH_ADDR_MASK 0x00ffffff
+
+#define STM_8MBIT_SIGNATURE 0x13
+#define STM_M25P80_BYTE_COUNT 1048576
+#define STM_M25P80_SECTOR_COUNT 16
+#define STM_M25P80_SECTOR_SIZE 0x10000
+
+#define STM_16MBIT_SIGNATURE 0x14
+#define STM_M25P16_BYTE_COUNT 2097152
+#define STM_M25P16_SECTOR_COUNT 32
+#define STM_M25P16_SECTOR_SIZE 0x10000
+
+#define STM_32MBIT_SIGNATURE 0x15
+#define STM_M25P32_BYTE_COUNT 4194304
+#define STM_M25P32_SECTOR_COUNT 64
+#define STM_M25P32_SECTOR_SIZE 0x10000
+
+#define STM_64MBIT_SIGNATURE 0x16
+#define STM_M25P64_BYTE_COUNT 8388608
+#define STM_M25P64_SECTOR_COUNT 128
+#define STM_M25P64_SECTOR_SIZE 0x10000
+
+#define STM_128MBIT_SIGNATURE 0x17
+#define STM_M25P128_BYTE_COUNT 16777216
+#define STM_M25P128_SECTOR_COUNT 256
+#define STM_M25P128_SECTOR_SIZE 0x10000
+
+#define STM_1MB_BYTE_COUNT STM_M25P80_BYTE_COUNT
+#define STM_1MB_SECTOR_COUNT STM_M25P80_SECTOR_COUNT
+#define STM_1MB_SECTOR_SIZE STM_M25P80_SECTOR_SIZE
+#define STM_2MB_BYTE_COUNT STM_M25P16_BYTE_COUNT
+#define STM_2MB_SECTOR_COUNT STM_M25P16_SECTOR_COUNT
+#define STM_2MB_SECTOR_SIZE STM_M25P16_SECTOR_SIZE
+#define STM_4MB_BYTE_COUNT STM_M25P32_BYTE_COUNT
+#define STM_4MB_SECTOR_COUNT STM_M25P32_SECTOR_COUNT
+#define STM_4MB_SECTOR_SIZE STM_M25P32_SECTOR_SIZE
+#define STM_8MB_BYTE_COUNT STM_M25P64_BYTE_COUNT
+#define STM_8MB_SECTOR_COUNT STM_M25P64_SECTOR_COUNT
+#define STM_8MB_SECTOR_SIZE STM_M25P64_SECTOR_SIZE
+#define STM_16MB_BYTE_COUNT STM_M25P128_BYTE_COUNT
+#define STM_16MB_SECTOR_COUNT STM_M25P128_SECTOR_COUNT
+#define STM_16MB_SECTOR_SIZE STM_M25P128_SECTOR_SIZE
+
+/*
+ * ST Microelectronics Opcodes for Serial Flash
+ */
+
+#define STM_OP_WR_ENABLE 0x06 /* Write Enable */
+#define STM_OP_WR_DISABLE 0x04 /* Write Disable */
+#define STM_OP_RD_STATUS 0x05 /* Read Status */
+#define STM_OP_WR_STATUS 0x01 /* Write Status */
+#define STM_OP_RD_DATA 0x03 /* Read Data */
+#define STM_OP_FAST_RD_DATA 0x0b /* Fast Read Data */
+#define STM_OP_PAGE_PGRM 0x02 /* Page Program */
+#define STM_OP_SECTOR_ERASE 0xd8 /* Sector Erase */
+#define STM_OP_BULK_ERASE 0xc7 /* Bulk Erase */
+#define STM_OP_DEEP_PWRDOWN 0xb9 /* Deep Power-Down Mode */
+#define STM_OP_RD_SIG 0xab /* Read Electronic Signature */
+
+#define STM_STATUS_WIP 0x01 /* Write-In-Progress */
+#define STM_STATUS_WEL 0x02 /* Write Enable Latch */
+#define STM_STATUS_BP0 0x04 /* Block Protect 0 */
+#define STM_STATUS_BP1 0x08 /* Block Protect 1 */
+#define STM_STATUS_BP2 0x10 /* Block Protect 2 */
+#define STM_STATUS_SRWD 0x80 /* Status Register Write Disable */
+
+/*
+ * SPI Flash Interface Registers
+ */
+
+#define SPI_FLASH_CTL 0x00
+#define SPI_FLASH_OPCODE 0x04
+#define SPI_FLASH_DATA 0x08
+
+#define SPI_CTL_START 0x00000100
+#define SPI_CTL_BUSY 0x00010000
+#define SPI_CTL_TXCNT_MASK 0x0000000f
+#define SPI_CTL_RXCNT_MASK 0x000000f0
+#define SPI_CTL_TX_RX_CNT_MASK 0x000000ff
+#define SPI_CTL_SIZE_MASK 0x00060000
+
+#define SPI_CTL_CLK_SEL_MASK 0x03000000
+#define SPI_OPCODE_MASK 0x000000ff
+
+#define SPI_STATUS_WIP STM_STATUS_WIP
+
+#endif
--- a/arch/mips/ath25/ar2315.c
+++ b/arch/mips/ath25/ar2315.c
@@ -220,6 +220,28 @@ static struct platform_device ar2315_gpi
.num_resources = ARRAY_SIZE(ar2315_gpio_res)
};
+static struct resource ar2315_spiflash_res[] = {
+ {
+ .name = "spiflash_read",
+ .flags = IORESOURCE_MEM,
+ .start = AR2315_SPI_READ_BASE,
+ .end = AR2315_SPI_READ_BASE + AR2315_SPI_READ_SIZE - 1,
+ },
+ {
+ .name = "spiflash_mmr",
+ .flags = IORESOURCE_MEM,
+ .start = AR2315_SPI_MMR_BASE,
+ .end = AR2315_SPI_MMR_BASE + AR2315_SPI_MMR_SIZE - 1,
+ },
+};
+
+static struct platform_device ar2315_spiflash = {
+ .id = 0,
+ .name = "ar2315-spiflash",
+ .resource = ar2315_spiflash_res,
+ .num_resources = ARRAY_SIZE(ar2315_spiflash_res)
+};
+
void __init ar2315_init_devices(void)
{
/* Find board configuration */
@@ -230,6 +252,8 @@ void __init ar2315_init_devices(void)
ar2315_gpio_res[1].end = ar2315_gpio_res[1].start;
platform_device_register(&ar2315_gpio);
+ platform_device_register(&ar2315_spiflash);
+
ar2315_eth_data.macaddr = ath25_board.config->enet0_mac;
ath25_add_ethernet(0, AR2315_ENET0_BASE, "eth0_mii",
AR2315_ENET0_MII_BASE, AR2315_IRQ_ENET0,
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