1 files changed, 156 insertions, 4 deletions

diff --git a/drivers/i2c/busses/i2c-sibyte.c b/drivers/i2c/busses/i2c-sibyte.c
index fa503ed9f86d..8f2b1f0deb81 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 const 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)) }
@@ -58,13 +210,13 @@ 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);
 module_exit(i2c_sibyte_exit);
 
-MODULE_AUTHOR("Kip Walker <kwalker@broadcom.com>, Steven J. Hill <sjhill@realitydiluted.com>");
+MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>");
 MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards");
 MODULE_LICENSE("GPL");