1 /* Copyright(c) 2000, Compaq Computer Corporation
2 * Fibre Channel Host Bus Adapter
4 * Originally developed and tested on:
5 * (front): [chip] Tachyon TS HPFC-5166A/1.2 L2C1090 ...
6 * SP# P225CXCBFIEL6T, Rev XC
7 * SP# 161290-001, Rev XD
8 * (back): Board No. 010008-001 A/W Rev X5, FAB REV X5
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2, or (at your option) any
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 * Written by Don Zimmerman
21 // These functions control the NVRAM I2C hardware on
22 // non-intelligent Fibre Host Adapters.
23 // The primary purpose is to read the HBA's NVRAM to get adapter's
24 // manufactured WWN to copy into Tachyon chip registers
25 // Orignal source author unknown
27 #include <linux/types.h>
28 enum boolean { FALSE, TRUE } ;
45 #include <linux/string.h>
46 #include <linux/pci.h>
47 #include <linux/delay.h>
48 #include <linux/sched.h>
49 #include <asm/io.h> // struct pt_regs for IRQ handler & Port I/O
51 #include "cpqfcTSchip.h"
53 static void tl_i2c_tx_byte( void* GPIOout, UCHAR data );
54 /*static BOOLEAN tl_write_i2c_page_portion( void* GPIOin, void* GPIOout,
55 USHORT startOffset, // e.g. 0x2f for WWN start
61 // Tachlite GPIO2, GPIO3 (I2C) DEFINES
62 // The NVRAM chip NM24C03 defines SCL (serial clock) and SDA (serial data)
63 // GPIO2 drives SDA, and GPIO3 drives SCL
65 // Since Tachlite inverts the state of the GPIO 0-3 outputs, SET writes 0
66 // and clear writes 1. The input lines (read in TL status) is NOT inverted
67 // This really helps confuse the code and debugging.
69 #define SET_DATA_HI 0x0
70 #define SET_DATA_LO 0x8
71 #define SET_CLOCK_HI 0x0
72 #define SET_CLOCK_LO 0x4
74 #define SENSE_DATA_HI 0x8
75 #define SENSE_DATA_LO 0x0
76 #define SENSE_CLOCK_HI 0x4
77 #define SENSE_CLOCK_LO 0x0
79 #define SLAVE_READ_ADDRESS 0xA1
80 #define SLAVE_WRITE_ADDRESS 0xA0
83 static void i2c_delay(ULONG mstime);
84 static void tl_i2c_clock_pulse( UCHAR , void* GPIOout);
85 static UCHAR tl_read_i2c_data( void* );
88 //-----------------------------------------------------------------------------
92 // This routine receives an acknowledge over the I2C bus.
94 //-----------------------------------------------------------------------------
95 static unsigned short tl_i2c_rx_ack( void* GPIOin, void* GPIOout )
99 // do clock pulse, let data line float high
100 tl_i2c_clock_pulse( SET_DATA_HI, GPIOout );
102 // slave must drive data low for acknowledge
103 value = tl_read_i2c_data( GPIOin);
104 if (value & SENSE_DATA_HI )
109 //-----------------------------------------------------------------------------
111 // Name: READ_I2C_REG
113 // This routine reads the I2C control register using the global
114 // IO address stored in gpioreg.
116 //-----------------------------------------------------------------------------
117 static UCHAR tl_read_i2c_data( void* gpioreg )
119 return( (UCHAR)(readl( gpioreg ) & 0x08L) ); // GPIO3
121 //-----------------------------------------------------------------------------
123 // Name: WRITE_I2C_REG
125 // This routine writes the I2C control register using the global
126 // IO address stored in gpioreg.
127 // In Tachlite, we don't want to modify other bits in TL Control reg.
129 //-----------------------------------------------------------------------------
130 static void tl_write_i2c_reg( void* gpioregOUT, UCHAR value )
134 // First read the register and clear out the old bits
135 temp = readl( gpioregOUT ) & 0xfffffff3L;
137 // Now or in the new data and send it back out
138 writel( temp | value, gpioregOUT);
140 //-----------------------------------------------------------------------------
142 // Name: I2C_TX_START
144 // This routine transmits a start condition over the I2C bus.
145 // 1. Set SCL (clock, GPIO2) HIGH, set SDA (data, GPIO3) HIGH,
146 // wait 5us to stabilize.
147 // 2. With SCL still HIGH, drive SDA low. The low transition marks
148 // the start condition to NM24Cxx (the chip)
149 // NOTE! In TL control reg., output 1 means chip sees LOW
151 //-----------------------------------------------------------------------------
152 static unsigned short tl_i2c_tx_start( void* GPIOin, void* GPIOout )
157 if ( !(tl_read_i2c_data(GPIOin) & SENSE_DATA_HI))
159 // start with clock high, let data float high
160 tl_write_i2c_reg( GPIOout, SET_DATA_HI | SET_CLOCK_HI );
162 // keep sending clock pulses if slave is driving data line
163 for (i = 0; i < 10; i++)
165 tl_i2c_clock_pulse( SET_DATA_HI, GPIOout );
167 if ( tl_read_i2c_data(GPIOin) & SENSE_DATA_HI )
171 // if he's still driving data low after 10 clocks, abort
172 value = tl_read_i2c_data( GPIOin ); // read status
173 if (!(value & 0x08) )
178 // To START, bring data low while clock high
179 tl_write_i2c_reg( GPIOout, SET_CLOCK_HI | SET_DATA_LO );
183 return( TRUE ); // TX start successful
185 //-----------------------------------------------------------------------------
189 // This routine transmits a stop condition over the I2C bus.
191 //-----------------------------------------------------------------------------
193 static unsigned short tl_i2c_tx_stop( void* GPIOin, void* GPIOout )
197 for (i = 0; i < 10; i++)
199 // Send clock pulse, drive data line low
200 tl_i2c_clock_pulse( SET_DATA_LO, GPIOout );
202 // To STOP, bring data high while clock high
203 tl_write_i2c_reg( GPIOout, SET_DATA_HI | SET_CLOCK_HI );
205 // Give the data line time to float high
208 // If slave is driving data line low, there's a problem; retry
209 if ( tl_read_i2c_data(GPIOin) & SENSE_DATA_HI )
210 return( TRUE ); // TX STOP successful!
213 return( FALSE ); // error
215 //-----------------------------------------------------------------------------
217 // Name: I2C_TX_uchar
219 // This routine transmits a byte across the I2C bus.
221 //-----------------------------------------------------------------------------
222 static void tl_i2c_tx_byte( void* GPIOout, UCHAR data )
226 for (bit = 0x80; bit; bit >>= 1)
229 tl_i2c_clock_pulse( (UCHAR)SET_DATA_HI, GPIOout);
231 tl_i2c_clock_pulse( (UCHAR)SET_DATA_LO, GPIOout);
234 //-----------------------------------------------------------------------------
236 // Name: I2C_RX_uchar
238 // This routine receives a byte across the I2C bus.
240 //-----------------------------------------------------------------------------
241 static UCHAR tl_i2c_rx_byte( void* GPIOin, void* GPIOout )
247 for (bit = 0x80; bit; bit >>= 1) {
248 // do clock pulse, let data line float high
249 tl_i2c_clock_pulse( SET_DATA_HI, GPIOout );
252 if ( tl_read_i2c_data( GPIOin) & 0x08 )
258 //*****************************************************************************
259 //*****************************************************************************
260 // Function: read_i2c_nvram
261 // Arguments: UCHAR count number of bytes to read
262 // UCHAR *buf area to store the bytes read
263 // Returns: 0 - failed
265 //*****************************************************************************
266 //*****************************************************************************
267 unsigned long cpqfcTS_ReadNVRAM( void* GPIOin, void* GPIOout , USHORT count,
272 if( !( tl_i2c_tx_start(GPIOin, GPIOout) ))
275 // Select the NVRAM for "dummy" write, to set the address
276 tl_i2c_tx_byte( GPIOout , SLAVE_WRITE_ADDRESS );
277 if ( !tl_i2c_rx_ack(GPIOin, GPIOout ) )
280 // Now send the address where we want to start reading
281 tl_i2c_tx_byte( GPIOout , 0 );
282 if ( !tl_i2c_rx_ack(GPIOin, GPIOout ) )
285 // Send a repeated start condition and select the
286 // slave for reading now.
287 if( tl_i2c_tx_start(GPIOin, GPIOout) )
288 tl_i2c_tx_byte( GPIOout, SLAVE_READ_ADDRESS );
290 if ( !tl_i2c_rx_ack(GPIOin, GPIOout) )
293 // this loop will now read out the data and store it
294 // in the buffer pointed to by buf
295 for ( i=0; i<count; i++)
297 *buf++ = tl_i2c_rx_byte(GPIOin, GPIOout);
299 // Send ACK by holding data line low for 1 clock
301 tl_i2c_clock_pulse( 0x08, GPIOout );
303 // Don't send ack for final byte
304 tl_i2c_clock_pulse( SET_DATA_HI, GPIOout );
308 tl_i2c_tx_stop(GPIOin, GPIOout);
313 //****************************************************************
317 // routines to set and clear the data and clock bits
321 //****************************************************************
323 static void tl_set_clock(void* gpioreg)
327 ret_val = readl( gpioreg );
328 ret_val &= 0xffffffFBL; // clear GPIO2 (SCL)
329 writel( ret_val, gpioreg);
332 static void tl_clr_clock(void* gpioreg)
336 ret_val = readl( gpioreg );
337 ret_val |= SET_CLOCK_LO;
338 writel( ret_val, gpioreg);
341 //*****************************************************************
344 // This routine will advance the clock by one period
347 //*****************************************************************
348 static void tl_i2c_clock_pulse( UCHAR value, void* GPIOout )
352 // clear the clock bit
353 tl_clr_clock( GPIOout );
358 // read the port to preserve non-I2C bits
359 ret_val = readl( GPIOout );
361 // clear the data & clock bits
362 ret_val &= 0xFFFFFFf3;
364 // write the value passed in...
365 // data can only change while clock is LOW!
366 ret_val |= value; // the data
367 ret_val |= SET_CLOCK_LO; // the clock
368 writel( ret_val, GPIOout );
374 tl_set_clock( GPIOout);
380 //*****************************************************************
383 // This routine returns the 64-bit WWN
386 //*****************************************************************
387 int cpqfcTS_GetNVRAM_data( UCHAR *wwnbuf, UCHAR *buf )
399 int iReturn=0; // def. 0 offset is failure to find WWN field
403 data_ptr = (UCHAR *)buf;
408 while ( (i < 128) && (!done) )
413 len = 1 + (z & 0x07);
415 name = (z & 0x78) >> 3;
422 len = 3 + data_ptr[i+1] + (data_ptr[i+2] << 8);
430 if ( data_ptr[j] == 0x3b ) {
435 while ( j<(i+len) ) {
436 sub_name = (data_ptr[j] & 0x3f);
437 sub_len = data_ptr[j+1] +
438 (data_ptr[j+2] << 8);
439 ptr_inc = sub_len + 3;
443 memcpy( wwnbuf, &data_ptr[j+3], 8);
466 // define a short 5 micro sec delay, and longer (ms) delay
468 static void i2c_delay(ULONG mstime)
472 // NOTE: we only expect to use these delays when reading
473 // our adapter's NVRAM, which happens only during adapter reset.
474 // Delay technique from "Linux Device Drivers", A. Rubini
477 // printk(" delay %lx ", mstime);
478 if( mstime ) // ms delay?
481 for( i=0; i < mstime; i++)
482 udelay(1000); // 1ms per loop
485 else // 5 micro sec delay
487 udelay( 5 ); // micro secs