patch-2.3.15 linux/drivers/atm/nicstarmac.c

• Lines: 270
• Date: Mon Aug 23 09:56:31 1999
• Orig file: v2.3.14/linux/drivers/atm/nicstarmac.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.14/linux/drivers/atm/nicstarmac.c linux/drivers/atm/nicstarmac.c
@@ -0,0 +1,269 @@
+/*
+ * this file included by nicstar.c
+ */
+
+/*
+ * nicstarmac.c
+ * Read this ForeRunner's MAC address from eprom/eeprom
+ */
+
+#define CYCLE_DELAY 5
+
+/* This was the original definition
+#define osp_MicroDelay(microsec) \
+    do { int _i = 4*microsec; while (--_i > 0) { __SLOW_DOWN_IO; }} while (0)
+*/
+#define osp_MicroDelay(microsec) {unsigned long useconds = (microsec); \
+                                  udelay((useconds));}
+
+
+/* The following tables represent the timing diagrams found in
+ * the Data Sheet for the Xicor X25020 EEProm.  The #defines below
+ * represent the bits in the NICStAR's General Purpose register
+ * that must be toggled for the corresponding actions on the EEProm
+ * to occur.
+ */
+
+/* Write Data To EEProm from SI line on rising edge of CLK */
+/* Read Data From EEProm on falling edge of CLK */
+
+#define CS_HIGH		0x0002		/* Chip select high */
+#define CS_LOW		0x0000		/* Chip select low (active low)*/
+#define CLK_HIGH	0x0004		/* Clock high */
+#define CLK_LOW		0x0000		/* Clock low  */
+#define SI_HIGH		0x0001		/* Serial input data high */
+#define SI_LOW		0x0000		/* Serial input data low */
+
+/* Read Status Register = 0000 0101b */
+static u_int32_t rdsrtab[] =
+{
+    CS_HIGH | CLK_HIGH, 
+    CS_LOW | CLK_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW,
+    CLK_HIGH,             /* 0 */
+    CLK_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW | SI_HIGH, 
+    CLK_HIGH | SI_HIGH,   /* 1 */
+    CLK_LOW | SI_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW | SI_HIGH, 
+    CLK_HIGH | SI_HIGH   /* 1 */
+};
+
+
+/* Read from EEPROM = 0000 0011b */
+static u_int32_t readtab[] =
+{
+    /*
+    CS_HIGH | CLK_HIGH, 
+    */
+    CS_LOW | CLK_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW,
+    CLK_HIGH,             /* 0 */
+    CLK_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW, 
+    CLK_HIGH,             /* 0 */
+    CLK_LOW | SI_HIGH, 
+    CLK_HIGH | SI_HIGH,   /* 1 */
+    CLK_LOW | SI_HIGH, 
+    CLK_HIGH | SI_HIGH    /* 1 */
+};
+
+
+/* Clock to read from/write to the eeprom */
+static u_int32_t clocktab[] =
+{	
+    CLK_LOW,
+    CLK_HIGH,
+    CLK_LOW, 
+    CLK_HIGH,
+    CLK_LOW,
+    CLK_HIGH,
+    CLK_LOW, 
+    CLK_HIGH,
+    CLK_LOW, 
+    CLK_HIGH,
+    CLK_LOW, 
+    CLK_HIGH, 
+    CLK_LOW, 
+    CLK_HIGH,
+    CLK_LOW, 
+    CLK_HIGH,
+    CLK_LOW 
+};
+
+
+#define NICSTAR_REG_WRITE(bs, reg, val) \
+	while ( readl(bs + STAT) & 0x0200 ) ; \
+	writel((val),(base)+(reg))
+#define NICSTAR_REG_READ(bs, reg) \
+	readl((base)+(reg))
+#define NICSTAR_REG_GENERAL_PURPOSE GP
+
+/*
+ * This routine will clock the Read_Status_reg function into the X2520
+ * eeprom, then pull the result from bit 16 of the NicSTaR's General Purpose 
+ * register.  
+ */
+
+u_int32_t
+nicstar_read_eprom_status( virt_addr_t base )
+{
+   u_int32_t	val;
+   u_int32_t	rbyte;
+   int32_t	i, j;
+
+   /* Send read instruction */
+   val = NICSTAR_REG_READ( base, NICSTAR_REG_GENERAL_PURPOSE ) & 0xFFFFFFF0;
+
+   for (i=0; i<sizeof rdsrtab/sizeof rdsrtab[0]; i++)
+   {
+	NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE,
+		(val | rdsrtab[i]) );
+        osp_MicroDelay( CYCLE_DELAY );
+   }
+
+   /* Done sending instruction - now pull data off of bit 16, MSB first */
+   /* Data clocked out of eeprom on falling edge of clock */
+
+   rbyte = 0;
+   for (i=7, j=0; i>=0; i--)
+   {
+	NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE,
+		(val | clocktab[j++]) );
+        rbyte |= (((NICSTAR_REG_READ( base, NICSTAR_REG_GENERAL_PURPOSE)
+			& 0x00010000) >> 16) << i);
+	NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE,
+		(val | clocktab[j++]) );
+        osp_MicroDelay( CYCLE_DELAY );
+   }
+   NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, 2 );
+   osp_MicroDelay( CYCLE_DELAY );
+   return rbyte;
+}
+
+
+/*
+ * This routine will clock the Read_data function into the X2520
+ * eeprom, followed by the address to read from, through the NicSTaR's General
+ * Purpose register.  
+ */
+ 
+static u_int8_t 
+read_eprom_byte(u_int32_t base, u_int8_t offset)
+{
+   u_int32_t val = 0;
+   int i,j=0;
+   u_int8_t tempread = 0;
+
+   val = NICSTAR_REG_READ( base, NICSTAR_REG_GENERAL_PURPOSE ) & 0xFFFFFFF0;
+
+   /* Send READ instruction */
+   for (i=0; i<sizeof readtab/sizeof readtab[0]; i++)
+   {
+	NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE,
+		(val | readtab[i]) );
+        osp_MicroDelay( CYCLE_DELAY );
+   }
+
+   /* Next, we need to send the byte address to read from */
+   for (i=7; i>=0; i--)
+   {
+      NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE,
+      		(val | clocktab[j++] | ((offset >> i) & 1) ) );
+      osp_MicroDelay(CYCLE_DELAY);
+      NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE,
+      		(val | clocktab[j++] | ((offset >> i) & 1) ) );
+      osp_MicroDelay( CYCLE_DELAY );
+   }
+
+   j = 0;
+   
+   /* Now, we can read data from the eeprom by clocking it in */
+   for (i=7; i>=0; i--)
+   {
+      NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE,
+      		(val | clocktab[j++]) );
+      osp_MicroDelay( CYCLE_DELAY );
+      tempread |= (((NICSTAR_REG_READ( base, NICSTAR_REG_GENERAL_PURPOSE )
+		& 0x00010000) >> 16) << i);
+      NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE,
+      		(val | clocktab[j++]) );
+      osp_MicroDelay( CYCLE_DELAY );
+   }
+
+   NICSTAR_REG_WRITE( base, NICSTAR_REG_GENERAL_PURPOSE, 2 );
+   osp_MicroDelay( CYCLE_DELAY );
+   return tempread;
+}
+
+
+void
+nicstar_init_eprom( virt_addr_t base )
+{
+    u_int32_t val;
+
+    /*
+     * turn chip select off
+     */
+    val = NICSTAR_REG_READ(base, NICSTAR_REG_GENERAL_PURPOSE) & 0xFFFFFFF0;
+
+    NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE,
+    	(val | CS_HIGH | CLK_HIGH));
+    osp_MicroDelay( CYCLE_DELAY );
+
+    NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE,
+    	(val | CS_HIGH | CLK_LOW));
+    osp_MicroDelay( CYCLE_DELAY );
+
+    NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE,
+    	(val | CS_HIGH | CLK_HIGH));
+    osp_MicroDelay( CYCLE_DELAY );
+
+    NICSTAR_REG_WRITE(base, NICSTAR_REG_GENERAL_PURPOSE,
+    	(val | CS_HIGH | CLK_LOW));
+    osp_MicroDelay( CYCLE_DELAY );
+}
+
+
+/*
+ * This routine will be the interface to the ReadPromByte function
+ * above.
+ */ 
+
+void
+nicstar_read_eprom(
+    virt_addr_t	base,
+    u_int8_t	prom_offset,
+    u_int8_t	*buffer,
+    u_int32_t	nbytes )
+{
+    u_int		i;
+    
+    for (i=0; i<nbytes; i++)
+    {
+	buffer[i] = read_eprom_byte( base, prom_offset );
+	++prom_offset;
+ 	osp_MicroDelay( CYCLE_DELAY );
+    }
+}
+
+
+/*
+void osp_MicroDelay(int x) {
+    
+}
+*/
+