i2c-algo-sibyte: Merge into i2c-sibyte

i2c-algo-sibyte: Merge into i2c-sibyte

Merge i2c-algo-sibyte into i2c-sibyte, as this is a complete,
hardware-dependent SMBus implementation and not a reusable algorithm.

Perform some basic coding style cleanups while we're here (mainly
space-based indentation replaced by tabulations.)

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 155 insertions, 3 deletions

diff --git a/drivers/i2c/busses/i2c-sibyte.c b/drivers/i2c/busses/i2c-sibyte.c
index fa503ed9f86..f516eb7a23f 100644
--- a/drivers/i2c/busses/i2c-sibyte.c
+++ b/drivers/i2c/busses/i2c-sibyte.c
@@ -1,6 +1,7 @@
 /*
  * Copyright (C) 2004 Steven J. Hill
  * Copyright (C) 2001,2002,2003 Broadcom Corporation
+ * Copyright (C) 1995-2000 Simon G. Vogl
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -17,11 +18,162 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
 
+#include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/i2c-algo-sibyte.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <asm/io.h>
 #include <asm/sibyte/sb1250_regs.h>
 #include <asm/sibyte/sb1250_smbus.h>
 
+
+struct i2c_algo_sibyte_data {
+	void *data;		/* private data */
+	int   bus;		/* which bus */
+	void *reg_base;		/* CSR base */
+};
+
+/* ----- global defines ----------------------------------------------- */
+#define SMB_CSR(a,r) ((long)(a->reg_base + r))
+
+/* ----- global variables --------------------------------------------- */
+
+/* module parameters:
+ */
+static int bit_scan;	/* have a look at what's hanging 'round */
+module_param(bit_scan, int, 0);
+MODULE_PARM_DESC(bit_scan, "Scan for active chips on the bus");
+
+
+static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr,
+		      unsigned short flags, char read_write,
+		      u8 command, int size, union i2c_smbus_data * data)
+{
+	struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
+	int data_bytes = 0;
+	int error;
+
+	while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
+		;
+
+	switch (size) {
+	case I2C_SMBUS_QUICK:
+		csr_out32((V_SMB_ADDR(addr) |
+			   (read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) |
+			   V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START));
+		break;
+	case I2C_SMBUS_BYTE:
+		if (read_write == I2C_SMBUS_READ) {
+			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_RD1BYTE),
+				  SMB_CSR(adap, R_SMB_START));
+			data_bytes = 1;
+		} else {
+			csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
+			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR1BYTE),
+				  SMB_CSR(adap, R_SMB_START));
+		}
+		break;
+	case I2C_SMBUS_BYTE_DATA:
+		csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
+		if (read_write == I2C_SMBUS_READ) {
+			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD1BYTE),
+				  SMB_CSR(adap, R_SMB_START));
+			data_bytes = 1;
+		} else {
+			csr_out32(V_SMB_LB(data->byte),
+				  SMB_CSR(adap, R_SMB_DATA));
+			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
+				  SMB_CSR(adap, R_SMB_START));
+		}
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
+		if (read_write == I2C_SMBUS_READ) {
+			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD2BYTE),
+				  SMB_CSR(adap, R_SMB_START));
+			data_bytes = 2;
+		} else {
+			csr_out32(V_SMB_LB(data->word & 0xff),
+				  SMB_CSR(adap, R_SMB_DATA));
+			csr_out32(V_SMB_MB(data->word >> 8),
+				  SMB_CSR(adap, R_SMB_DATA));
+			csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
+				  SMB_CSR(adap, R_SMB_START));
+		}
+		break;
+	default:
+		return -1;      /* XXXKW better error code? */
+	}
+
+	while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
+		;
+
+	error = csr_in32(SMB_CSR(adap, R_SMB_STATUS));
+	if (error & M_SMB_ERROR) {
+		/* Clear error bit by writing a 1 */
+		csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS));
+		return -1;      /* XXXKW better error code? */
+	}
+
+	if (data_bytes == 1)
+		data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff;
+	if (data_bytes == 2)
+		data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff;
+
+	return 0;
+}
+
+static u32 bit_func(struct i2c_adapter *adap)
+{
+	return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
+		I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA);
+}
+
+
+/* -----exported algorithm data: -------------------------------------	*/
+
+static struct i2c_algorithm i2c_sibyte_algo = {
+	.smbus_xfer	= smbus_xfer,
+	.functionality	= bit_func,
+};
+
+/*
+ * registering functions to load algorithms at runtime
+ */
+int i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
+{
+	int i;
+	struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
+
+	/* register new adapter to i2c module... */
+	i2c_adap->algo = &i2c_sibyte_algo;
+
+	/* Set the frequency to 100 kHz */
+	csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));
+	csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));
+
+	/* scan bus */
+	if (bit_scan) {
+		union i2c_smbus_data data;
+		int rc;
+		printk(KERN_INFO " i2c-algo-sibyte.o: scanning bus %s.\n",
+		       i2c_adap->name);
+		for (i = 0x00; i < 0x7f; i++) {
+			/* XXXKW is this a realistic probe? */
+			rc = smbus_xfer(i2c_adap, i, 0, I2C_SMBUS_READ, 0,
+					I2C_SMBUS_BYTE_DATA, &data);
+			if (!rc) {
+				printk("(%02x)",i);
+			} else
+				printk(".");
+		}
+		printk("\n");
+	}
+
+	return i2c_add_adapter(i2c_adap);
+}
+
+
 static struct i2c_algo_sibyte_data sibyte_board_data[2] = {
 	{ NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) },
 	{ NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) }
@@ -58,8 +210,8 @@ static int __init i2c_sibyte_init(void)
 
 static void __exit i2c_sibyte_exit(void)
 {
-	i2c_sibyte_del_bus(&sibyte_board_adapter[0]);
-	i2c_sibyte_del_bus(&sibyte_board_adapter[1]);
+	i2c_del_bus(&sibyte_board_adapter[0]);
+	i2c_del_bus(&sibyte_board_adapter[1]);
 }
 
 module_init(i2c_sibyte_init);