On Thu, Jun 23, 2011 at 07:21:03PM +0530, Jayachandran C. wrote:
> From: Ganesan Ramalingam <ganesanr@xxxxxxxxxxxxxxxxx>
>
> - platform.c : add i2c platform device
> - i2c-xlr.c : algorithm and i2c adaptor
> - Kconfig/Makefile: add CONFIG_I2C_XLR option
>
> Signed-off-by: Ganesan Ramalingam <ganesanr@xxxxxxxxxxxxxxxxx>
> Signed-off-by: Jayachandran C <jayachandranc@xxxxxxxxxxxxxxxxx>
> ---
snip
> diff --git a/arch/mips/netlogic/xlr/platform.c b/arch/mips/netlogic/xlr/platform.c
> index 609ec25..2cd2d3c 100644
> --- a/arch/mips/netlogic/xlr/platform.c
> +++ b/arch/mips/netlogic/xlr/platform.c
> @@ -14,6 +14,7 @@
> #include <linux/resource.h>
> #include <linux/serial_8250.h>
> #include <linux/serial_reg.h>
> +#include <linux/i2c.h>
>
> #include <asm/netlogic/xlr/iomap.h>
> #include <asm/netlogic/xlr/pic.h>
> @@ -66,6 +67,34 @@ void nlm_xlr_uart_out(struct uart_port *p, int offset, int value)
> .serial_out = nlm_xlr_uart_out, \
> }
>
> +#ifdef CONFIG_I2C
> +static struct i2c_board_info nlm_i2c_info1[] __initdata = {
> + /* All XLR boards have this RTC and Max6657 Temp Chip */
> + {"ds1374", 0, 0x68, 0, 0, 0},
> + {"lm90", 0, 0x4c, 0, 0, 0},
> +};
- named initialisers, or even the I2C_BOARD_INFO()
- no need to have the fields initialiser with 0 after the address.
- spaces betwee { and }
> config I2C_BLACKFIN_TWI
> tristate "Blackfin TWI I2C support"
> depends on BLACKFIN
> new file mode 100644
> index 0000000..ac3d989
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-xlr.c
> @@ -0,0 +1,335 @@
> +/*
> + * Copyright 2011, Netlogic Microsystems Inc.
> + * Copyright 2004, Matt Porter <mporter@xxxxxxxxxxxxxxxxxxx>
> + *
> + * This file is licensed under the terms of the GNU General Public
> + * License version 2. This program is licensed "as is" without any
> + * warranty of any kind, whether express or implied.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/init.h>
> +#include <linux/ioport.h>
> +#include <linux/delay.h>
> +#include <linux/errno.h>
> +#include <linux/i2c.h>
> +#include <linux/io.h>
> +#include <linux/platform_device.h>
> +#include <asm/netlogic/xlr/iomap.h>
> +
> +/* XLR I2C REGISTERS */
> +#define XLR_I2C_CFG 0x00
> +#define XLR_I2C_CLKDIV 0x01
> +#define XLR_I2C_DEVADDR 0x02
> +#define XLR_I2C_ADDR 0x03
> +#define XLR_I2C_DATAOUT 0x04
> +#define XLR_I2C_DATAIN 0x05
> +#define XLR_I2C_STATUS 0x06
> +#define XLR_I2C_STARTXFR 0x07
> +#define XLR_I2C_BYTECNT 0x08
> +#define XLR_I2C_HDSTATIM 0x09
> +
> +/* XLR I2C REGISTERS FLAGS */
> +#define XLR_I2C_BUS_BUSY 0x01
> +#define XLR_I2C_SDOEMPTY 0x02
> +#define XLR_I2C_RXRDY 0x04
> +#define XLR_I2C_ACK_ERR 0x08
> +#define XLR_I2C_ARB_STARTERR 0x30
> +
> +/* Register Programming Values!! Change as required */
> +#define XLR_I2C_CFG_ADDR 0xF8 /* 8-Bit dev Addr + POR Values */
> +#define XLR_I2C_CFG_NOADDR 0xFA /* 8-Bit reg Addr + POR Values */
> +#define XLR_I2C_STARTXFR_ND 0x02 /* No data , only addr */
> +#define XLR_I2C_STARTXFR_RD 0x01 /* Read */
> +#define XLR_I2C_STARTXFR_WR 0x00 /* Write */
> +#define XLR_I2C_CLKDIV_DEF 0x14A /* 0x00000052 */
> +#define XLR_I2C_HDSTATIM_DEF 0x107 /* 0x00000000 */
> +
> +struct xlr_i2c_private {
> + struct i2c_adapter adap;
> + u32 *iobase_i2c_regs;
this should at-least be __iomem attributed
> +};
> +static struct xlr_i2c_private xlr_i2c_priv;
> +
> +u32 *get_i2c_base(unsigned short bus)
> +{
> + nlm_reg_t *mmio = 0;
> +
> + if (bus == 0)
> + mmio = netlogic_io_mmio(NETLOGIC_IO_I2C_0_OFFSET);
> + else
> + mmio = netlogic_io_mmio(NETLOGIC_IO_I2C_1_OFFSET);
> +
> + return (u32 *)mmio;
> +}
shouldn't this be in with the platform device?
> +static void xlr_i2c_write(u32 *iobase_i2c_regs, int reg, int val)
> +{
> + netlogic_write_reg(iobase_i2c_regs, reg, val);
> +}
did you really need to wrapper these functions?
> +static u32 xlr_i2c_read(u32 *iobase_i2c_regs, int reg)
> +{
> + u32 retVal = netlogic_read_reg(iobase_i2c_regs, reg);
> + return retVal;
> +}
> +
> + u16 addr,
> + unsigned short flags,
> + char read_write,
> + u8 command,
> + int protocol,
> + union i2c_smbus_data *data)
> +{
> + struct xlr_i2c_private *priv = i2c_adap->algo_data;
> + int err;
> + int len;
> +
> + switch (protocol) {
> + case I2C_SMBUS_BYTE:
> + if (read_write == I2C_SMBUS_READ)
> + err = xlr_i2c_rx(priv, 1, &data->byte, addr, command);
> + else
> + err = xlr_i2c_tx(priv, 1, &data->byte, addr, command);
> +
> + break;
> + case I2C_SMBUS_BYTE_DATA:
> + if (read_write == I2C_SMBUS_READ)
> + err = xlr_i2c_rx(priv, 1, &data->byte, addr, command);
> + else
> + err = xlr_i2c_tx(priv, 1, &data->byte, addr, command);
> + break;
> +
> + case I2C_SMBUS_WORD_DATA:
> + case I2C_SMBUS_PROC_CALL:
> + if (read_write == I2C_SMBUS_READ)
> + err = xlr_i2c_rx(priv, 2, (u8 *)&data->word,
> + addr, command);
> + else
> + err = xlr_i2c_tx(priv, 2, (u8 *)&data->word,
> + addr, command);
> +
> + break;
> + case I2C_FUNC_SMBUS_BLOCK_DATA:
> + case I2C_SMBUS_I2C_BLOCK_DATA:
> + len = (data->block[0] > I2C_SMBUS_BLOCK_MAX) ?
> + I2C_SMBUS_BLOCK_MAX : data->block[0];
> + if (read_write == I2C_SMBUS_READ)
> + err = xlr_i2c_rx(priv, len, &data->block[1],
> + addr, command);
> + else
> + err = xlr_i2c_tx(priv, len, &data->block[1],
> + addr, command);
> +
> + break;
> + default:
> + err = -1;
> + }
> + return err;
> +}
thought most of these case where handled by the core translating
them into the proper i2c messages?
> +
> +static u32 xlr_func(struct i2c_adapter *adap)
> +{
> + /* We emulate SMBUS over I2C */
> + return I2C_FUNC_SMBUS_EMUL;
> +}
> +
> +static struct i2c_algorithm xlr_i2c_algo = {
> + .smbus_xfer = smbus_xfer,
> + .functionality = xlr_func,
> +};
> +
> +int xlr_i2c_add_bus(struct xlr_i2c_private *priv)
> +{
> + priv->adap.owner = THIS_MODULE;
> + priv->adap.algo_data = priv;
> + priv->adap.nr = 1;
> + priv->adap.algo = &xlr_i2c_algo;
> + priv->adap.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
> + snprintf(priv->adap.name, sizeof(priv->adap.name),
> + "SMBus XLR I2C Adapter");
> +
> + /* register new adapter to i2c module... */
> + if (i2c_add_numbered_adapter(&priv->adap))
> + return -1;
> +
> + return 0;
> +}
> +
> +int xlr_i2c_del_bus(struct i2c_adapter *adap)
> +{
> + return i2c_del_adapter(adap);
> +}
> +
> +static int __devinit xlr_i2c_probe(struct platform_device *pd)
> +{
> + xlr_i2c_priv.iobase_i2c_regs = get_i2c_base(pd->id);
> +
> + xlr_i2c_priv.adap.dev.parent = &pd->dev;
> + if (xlr_i2c_add_bus(&xlr_i2c_priv) < 0) {
> + dev_err(&xlr_i2c_priv.adap.dev, "Failed to add i2c bus\n");
> + goto out;
> + } else
> + dev_info(&xlr_i2c_priv.adap.dev, "Added I2C Bus.\n");
> +
> + return 0;
> +out:
> + return -ENODEV;
-ENODEV will get ignored by the upper layer. Need to find a better
error code.
> +}
> +MODULE_AUTHOR("Netlogic Microsystems Inc.");
> +MODULE_DESCRIPTION("XLR I2C SMBus driver");
> +MODULE_LICENSE("GPL");
no module alias for the platform device?
> +module_init(xlr_i2c_init);
> +module_exit(xlr_i2c_exit);
> --
> 1.7.4.1
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