Initial import

1 files changed, 248 insertions, 0 deletions

diff --git a/drivers/atm/nicstarmac.c b/drivers/atm/nicstarmac.c
new file mode 100644
index 000000000..f594526f8
--- /dev/null
+++ b/drivers/atm/nicstarmac.c
@@ -0,0 +1,248 @@
+/*
+ * this file included by nicstar.c
+ */
+
+/*
+ * nicstarmac.c
+ * Read this ForeRunner's MAC address from eprom/eeprom
+ */
+
+#include <linux/kernel.h>
+
+typedef void __iomem *virt_addr_t;
+
+#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 */
+#if 0
+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 */
+};
+#endif /*  0  */
+
+/* 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.  
+ */
+#if 0
+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 < ARRAY_SIZE(rdsrtab); 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;
+}
+#endif /*  0  */
+
+/*
+ * 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(virt_addr_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 < ARRAY_SIZE(readtab); 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;
+}
+
+static 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.
+ */
+
+static 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);
+	}
+}