330 lines
6.8 KiB
C
330 lines
6.8 KiB
C
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/*
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* B53 register access through SPI
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*
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* Copyright (C) 2011-2013 Jonas Gorski <jogo@openwrt.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <asm/unaligned.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/platform_data/b53.h>
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#include "b53_priv.h"
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#define B53_SPI_DATA 0xf0
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#define B53_SPI_STATUS 0xfe
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#define B53_SPI_CMD_SPIF BIT(7)
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#define B53_SPI_CMD_RACK BIT(5)
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#define B53_SPI_CMD_READ 0x00
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#define B53_SPI_CMD_WRITE 0x01
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#define B53_SPI_CMD_NORMAL 0x60
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#define B53_SPI_CMD_FAST 0x10
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#define B53_SPI_PAGE_SELECT 0xff
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static inline int b53_spi_read_reg(struct spi_device *spi, u8 reg, u8 *val,
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unsigned int len)
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{
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u8 txbuf[2];
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txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_READ;
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txbuf[1] = reg;
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return spi_write_then_read(spi, txbuf, 2, val, len);
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}
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static inline int b53_spi_clear_status(struct spi_device *spi)
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{
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unsigned int i;
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u8 rxbuf;
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int ret;
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for (i = 0; i < 10; i++) {
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ret = b53_spi_read_reg(spi, B53_SPI_STATUS, &rxbuf, 1);
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if (ret)
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return ret;
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if (!(rxbuf & B53_SPI_CMD_SPIF))
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break;
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mdelay(1);
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}
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if (i == 10)
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return -EIO;
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return 0;
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}
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static inline int b53_spi_set_page(struct spi_device *spi, u8 page)
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{
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u8 txbuf[3];
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txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
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txbuf[1] = B53_SPI_PAGE_SELECT;
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txbuf[2] = page;
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return spi_write(spi, txbuf, sizeof(txbuf));
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}
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static inline int b53_prepare_reg_access(struct spi_device *spi, u8 page)
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{
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int ret = b53_spi_clear_status(spi);
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if (ret)
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return ret;
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return b53_spi_set_page(spi, page);
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}
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static int b53_spi_prepare_reg_read(struct spi_device *spi, u8 reg)
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{
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u8 rxbuf;
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int retry_count;
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int ret;
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ret = b53_spi_read_reg(spi, reg, &rxbuf, 1);
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if (ret)
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return ret;
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for (retry_count = 0; retry_count < 10; retry_count++) {
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ret = b53_spi_read_reg(spi, B53_SPI_STATUS, &rxbuf, 1);
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if (ret)
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return ret;
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if (rxbuf & B53_SPI_CMD_RACK)
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break;
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mdelay(1);
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}
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if (retry_count == 10)
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return -EIO;
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return 0;
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}
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static int b53_spi_read(struct b53_device *dev, u8 page, u8 reg, u8 *data,
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unsigned int len)
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{
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struct spi_device *spi = dev->priv;
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int ret;
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ret = b53_prepare_reg_access(spi, page);
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if (ret)
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return ret;
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ret = b53_spi_prepare_reg_read(spi, reg);
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if (ret)
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return ret;
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return b53_spi_read_reg(spi, B53_SPI_DATA, data, len);
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}
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static int b53_spi_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
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{
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return b53_spi_read(dev, page, reg, val, 1);
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}
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static int b53_spi_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
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{
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int ret = b53_spi_read(dev, page, reg, (u8 *)val, 2);
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if (!ret)
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*val = le16_to_cpu(*val);
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return ret;
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}
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static int b53_spi_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
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{
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int ret = b53_spi_read(dev, page, reg, (u8 *)val, 4);
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if (!ret)
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*val = le32_to_cpu(*val);
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return ret;
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}
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static int b53_spi_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
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{
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int ret;
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*val = 0;
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ret = b53_spi_read(dev, page, reg, (u8 *)val, 6);
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if (!ret)
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*val = le64_to_cpu(*val);
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return ret;
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}
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static int b53_spi_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
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{
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int ret = b53_spi_read(dev, page, reg, (u8 *)val, 8);
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if (!ret)
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*val = le64_to_cpu(*val);
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return ret;
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}
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static int b53_spi_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
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{
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struct spi_device *spi = dev->priv;
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int ret;
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u8 txbuf[3];
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ret = b53_prepare_reg_access(spi, page);
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if (ret)
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return ret;
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txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
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txbuf[1] = reg;
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txbuf[2] = value;
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return spi_write(spi, txbuf, sizeof(txbuf));
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}
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static int b53_spi_write16(struct b53_device *dev, u8 page, u8 reg, u16 value)
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{
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struct spi_device *spi = dev->priv;
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int ret;
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u8 txbuf[4];
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ret = b53_prepare_reg_access(spi, page);
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if (ret)
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return ret;
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txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
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txbuf[1] = reg;
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put_unaligned_le16(value, &txbuf[2]);
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return spi_write(spi, txbuf, sizeof(txbuf));
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}
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static int b53_spi_write32(struct b53_device *dev, u8 page, u8 reg, u32 value)
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{
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struct spi_device *spi = dev->priv;
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int ret;
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u8 txbuf[6];
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ret = b53_prepare_reg_access(spi, page);
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if (ret)
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return ret;
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txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
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txbuf[1] = reg;
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put_unaligned_le32(value, &txbuf[2]);
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return spi_write(spi, txbuf, sizeof(txbuf));
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}
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static int b53_spi_write48(struct b53_device *dev, u8 page, u8 reg, u64 value)
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{
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struct spi_device *spi = dev->priv;
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int ret;
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u8 txbuf[10];
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ret = b53_prepare_reg_access(spi, page);
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if (ret)
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return ret;
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txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
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txbuf[1] = reg;
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put_unaligned_le64(value, &txbuf[2]);
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return spi_write(spi, txbuf, sizeof(txbuf) - 2);
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}
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static int b53_spi_write64(struct b53_device *dev, u8 page, u8 reg, u64 value)
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{
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struct spi_device *spi = dev->priv;
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int ret;
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u8 txbuf[10];
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ret = b53_prepare_reg_access(spi, page);
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if (ret)
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return ret;
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txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
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txbuf[1] = reg;
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put_unaligned_le64(value, &txbuf[2]);
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return spi_write(spi, txbuf, sizeof(txbuf));
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}
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static const struct b53_io_ops b53_spi_ops = {
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.read8 = b53_spi_read8,
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.read16 = b53_spi_read16,
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.read32 = b53_spi_read32,
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.read48 = b53_spi_read48,
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.read64 = b53_spi_read64,
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.write8 = b53_spi_write8,
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.write16 = b53_spi_write16,
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.write32 = b53_spi_write32,
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.write48 = b53_spi_write48,
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.write64 = b53_spi_write64,
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};
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static int b53_spi_probe(struct spi_device *spi)
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{
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struct b53_device *dev;
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int ret;
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dev = b53_switch_alloc(&spi->dev, &b53_spi_ops, spi);
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if (!dev)
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return -ENOMEM;
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if (spi->dev.platform_data)
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dev->pdata = spi->dev.platform_data;
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ret = b53_switch_register(dev);
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if (ret)
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return ret;
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spi_set_drvdata(spi, dev);
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return 0;
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}
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static int b53_spi_remove(struct spi_device *spi)
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{
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struct b53_device *dev = spi_get_drvdata(spi);
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if (dev)
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b53_switch_remove(dev);
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return 0;
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}
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static struct spi_driver b53_spi_driver = {
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.driver = {
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.name = "b53-switch",
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},
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.probe = b53_spi_probe,
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.remove = b53_spi_remove,
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};
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module_spi_driver(b53_spi_driver);
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MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
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MODULE_DESCRIPTION("B53 SPI access driver");
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MODULE_LICENSE("Dual BSD/GPL");
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