patch-2.4.22 linux-2.4.22/drivers/i2c/i2c-algo-sibyte.c

• Lines: 232
• Date: 2003-08-25 04:44:41.000000000 -0700
• Orig file: linux-2.4.21/drivers/i2c/i2c-algo-sibyte.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/drivers/i2c/i2c-algo-sibyte.c linux-2.4.22/drivers/i2c/i2c-algo-sibyte.c
@@ -0,0 +1,231 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-algo-sibyte.c i2c driver algorithms for bit-shift adapters		     */
+/* ------------------------------------------------------------------------- */
+/*   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 as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.		     */
+/* ------------------------------------------------------------------------- */
+
+/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
+   Frodo Looijaard <frodol@dds.nl>.  */
+
+/* Ported for SiByte SOCs by Broadcom Corporation.  */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <asm/sibyte/64bit.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_smbus.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-sibyte.h>
+
+/* ----- global defines ----------------------------------------------- */
+#define SMB_CSR(a,r) ((long)(a->reg_base + r))
+
+/* ----- global variables ---------------------------------------------	*/
+
+/* module parameters:
+ */
+static int bit_scan=0;	/* have a look at what's hanging 'round		*/
+
+
+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 int algo_control(struct i2c_adapter *adapter, 
+	unsigned int cmd, unsigned long arg)
+{
+	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 = {
+	"SiByte algorithm",
+	I2C_ALGO_SIBYTE,
+	NULL,                           /* master_xfer          */
+	smbus_xfer,                   	/* smbus_xfer           */
+	NULL,				/* slave_xmit		*/
+	NULL,				/* slave_recv		*/
+	algo_control,			/* ioctl		*/
+	bit_func,			/* functionality	*/
+};
+
+/* 
+ * 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->id |= i2c_sibyte_algo.id;
+	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");
+	}
+
+#ifdef MODULE
+	MOD_INC_USE_COUNT;
+#endif
+	i2c_add_adapter(i2c_adap);
+
+	return 0;
+}
+
+
+int i2c_sibyte_del_bus(struct i2c_adapter *adap)
+{
+	int res;
+
+	if ((res = i2c_del_adapter(adap)) < 0)
+		return res;
+
+#ifdef MODULE
+	MOD_DEC_USE_COUNT;
+#endif
+	return 0;
+}
+
+int __init i2c_algo_sibyte_init (void)
+{
+	printk("i2c-algo-sibyte.o: i2c SiByte algorithm module\n");
+	return 0;
+}
+
+
+EXPORT_SYMBOL(i2c_sibyte_add_bus);
+EXPORT_SYMBOL(i2c_sibyte_del_bus);
+
+#ifdef MODULE
+MODULE_AUTHOR("Kip Walker, Broadcom Corp.");
+MODULE_DESCRIPTION("SiByte I2C-Bus algorithm");
+MODULE_PARM(bit_scan, "i");
+MODULE_PARM_DESC(bit_scan, "Scan for active chips on the bus");
+MODULE_LICENSE("GPL");
+
+int init_module(void) 
+{
+	return i2c_algo_sibyte_init();
+}
+
+void cleanup_module(void) 
+{
+}
+#endif