-/*==========================================================
-**
-** NVRAM detection and reading.
-**
-** Currently supported:
-** - 24C16 EEPROM with both Symbios and Tekram layout.
-** - 93C46 EEPROM with Tekram layout.
-**
-**==========================================================
-*/
-
-#ifdef SCSI_NCR_NVRAM_SUPPORT
-/*
- * 24C16 EEPROM reading.
- *
- * GPOI0 - data in/data out
- * GPIO1 - clock
- * Symbios NVRAM wiring now also used by Tekram.
- */
-
-#define SET_BIT 0
-#define CLR_BIT 1
-#define SET_CLK 2
-#define CLR_CLK 3
-
-/*
- * Set/clear data/clock bit in GPIO0
- */
-static void __init
-S24C16_set_bit(ncr_slot *np, u_char write_bit, u_char *gpreg, int bit_mode)
-{
- UDELAY (5);
- switch (bit_mode){
- case SET_BIT:
- *gpreg |= write_bit;
- break;
- case CLR_BIT:
- *gpreg &= 0xfe;
- break;
- case SET_CLK:
- *gpreg |= 0x02;
- break;
- case CLR_CLK:
- *gpreg &= 0xfd;
- break;
-
- }
- OUTB (nc_gpreg, *gpreg);
- UDELAY (5);
-}
-
-/*
- * Send START condition to NVRAM to wake it up.
- */
-static void __init S24C16_start(ncr_slot *np, u_char *gpreg)
-{
- S24C16_set_bit(np, 1, gpreg, SET_BIT);
- S24C16_set_bit(np, 0, gpreg, SET_CLK);
- S24C16_set_bit(np, 0, gpreg, CLR_BIT);
- S24C16_set_bit(np, 0, gpreg, CLR_CLK);
-}
-
-/*
- * Send STOP condition to NVRAM - puts NVRAM to sleep... ZZzzzz!!
- */
-static void __init S24C16_stop(ncr_slot *np, u_char *gpreg)
-{
- S24C16_set_bit(np, 0, gpreg, SET_CLK);
- S24C16_set_bit(np, 1, gpreg, SET_BIT);
-}
-
-/*
- * Read or write a bit to the NVRAM,
- * read if GPIO0 input else write if GPIO0 output
- */
-static void __init
-S24C16_do_bit(ncr_slot *np, u_char *read_bit, u_char write_bit, u_char *gpreg)
-{
- S24C16_set_bit(np, write_bit, gpreg, SET_BIT);
- S24C16_set_bit(np, 0, gpreg, SET_CLK);
- if (read_bit)
- *read_bit = INB (nc_gpreg);
- S24C16_set_bit(np, 0, gpreg, CLR_CLK);
- S24C16_set_bit(np, 0, gpreg, CLR_BIT);
-}
-
-/*
- * Output an ACK to the NVRAM after reading,
- * change GPIO0 to output and when done back to an input
- */
-static void __init
-S24C16_write_ack(ncr_slot *np, u_char write_bit, u_char *gpreg, u_char *gpcntl)
-{
- OUTB (nc_gpcntl, *gpcntl & 0xfe);
- S24C16_do_bit(np, 0, write_bit, gpreg);
- OUTB (nc_gpcntl, *gpcntl);
-}
-
-/*
- * Input an ACK from NVRAM after writing,
- * change GPIO0 to input and when done back to an output
- */
-static void __init
-S24C16_read_ack(ncr_slot *np, u_char *read_bit, u_char *gpreg, u_char *gpcntl)
-{
- OUTB (nc_gpcntl, *gpcntl | 0x01);
- S24C16_do_bit(np, read_bit, 1, gpreg);
- OUTB (nc_gpcntl, *gpcntl);
-}
-
-/*
- * WRITE a byte to the NVRAM and then get an ACK to see it was accepted OK,
- * GPIO0 must already be set as an output
- */
-static void __init
-S24C16_write_byte(ncr_slot *np, u_char *ack_data, u_char write_data,
- u_char *gpreg, u_char *gpcntl)
-{
- int x;
-
- for (x = 0; x < 8; x++)
- S24C16_do_bit(np, 0, (write_data >> (7 - x)) & 0x01, gpreg);
-
- S24C16_read_ack(np, ack_data, gpreg, gpcntl);
-}
-
-/*
- * READ a byte from the NVRAM and then send an ACK to say we have got it,
- * GPIO0 must already be set as an input
- */
-static void __init
-S24C16_read_byte(ncr_slot *np, u_char *read_data, u_char ack_data,
- u_char *gpreg, u_char *gpcntl)
-{
- int x;
- u_char read_bit;
-
- *read_data = 0;
- for (x = 0; x < 8; x++) {
- S24C16_do_bit(np, &read_bit, 1, gpreg);
- *read_data |= ((read_bit & 0x01) << (7 - x));
- }
-
- S24C16_write_ack(np, ack_data, gpreg, gpcntl);
-}
-
-/*
- * Read 'len' bytes starting at 'offset'.
- */
-static int __init
-sym_read_S24C16_nvram (ncr_slot *np, int offset, u_char *data, int len)
-{
- u_char gpcntl, gpreg;
- u_char old_gpcntl, old_gpreg;
- u_char ack_data;
- int retv = 1;
- int x;
-
- /* save current state of GPCNTL and GPREG */
- old_gpreg = INB (nc_gpreg);
- old_gpcntl = INB (nc_gpcntl);
- gpcntl = old_gpcntl & 0x1c;
-
- /* set up GPREG & GPCNTL to set GPIO0 and GPIO1 in to known state */
- OUTB (nc_gpreg, old_gpreg);
- OUTB (nc_gpcntl, gpcntl);
-
- /* this is to set NVRAM into a known state with GPIO0/1 both low */
- gpreg = old_gpreg;
- S24C16_set_bit(np, 0, &gpreg, CLR_CLK);
- S24C16_set_bit(np, 0, &gpreg, CLR_BIT);
-
- /* now set NVRAM inactive with GPIO0/1 both high */
- S24C16_stop(np, &gpreg);
-
- /* activate NVRAM */
- S24C16_start(np, &gpreg);
-
- /* write device code and random address MSB */
- S24C16_write_byte(np, &ack_data,
- 0xa0 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
- if (ack_data & 0x01)
- goto out;
-
- /* write random address LSB */
- S24C16_write_byte(np, &ack_data,
- offset & 0xff, &gpreg, &gpcntl);
- if (ack_data & 0x01)
- goto out;
-
- /* regenerate START state to set up for reading */
- S24C16_start(np, &gpreg);
-
- /* rewrite device code and address MSB with read bit set (lsb = 0x01) */
- S24C16_write_byte(np, &ack_data,
- 0xa1 | ((offset >> 7) & 0x0e), &gpreg, &gpcntl);
- if (ack_data & 0x01)
- goto out;
-
- /* now set up GPIO0 for inputting data */
- gpcntl |= 0x01;
- OUTB (nc_gpcntl, gpcntl);
-
- /* input all requested data - only part of total NVRAM */
- for (x = 0; x < len; x++)
- S24C16_read_byte(np, &data[x], (x == (len-1)), &gpreg, &gpcntl);
-
- /* finally put NVRAM back in inactive mode */
- gpcntl &= 0xfe;
- OUTB (nc_gpcntl, gpcntl);
- S24C16_stop(np, &gpreg);
- retv = 0;
-out:
- /* return GPIO0/1 to original states after having accessed NVRAM */
- OUTB (nc_gpcntl, old_gpcntl);
- OUTB (nc_gpreg, old_gpreg);
-
- return retv;
-}
-
-#undef SET_BIT
-#undef CLR_BIT
-#undef SET_CLK
-#undef CLR_CLK
-
-/*
- * Try reading Symbios NVRAM.
- * Return 0 if OK.
- */
-static int __init sym_read_Symbios_nvram (ncr_slot *np, Symbios_nvram *nvram)
-{
- static u_char Symbios_trailer[6] = {0xfe, 0xfe, 0, 0, 0, 0};
- u_char *data = (u_char *) nvram;
- int len = sizeof(*nvram);
- u_short csum;
- int x;
-
- /* probe the 24c16 and read the SYMBIOS 24c16 area */
- if (sym_read_S24C16_nvram (np, SYMBIOS_NVRAM_ADDRESS, data, len))
- return 1;
-
- /* check valid NVRAM signature, verify byte count and checksum */
- if (nvram->type != 0 ||
- memcmp(nvram->trailer, Symbios_trailer, 6) ||
- nvram->byte_count != len - 12)
- return 1;
-
- /* verify checksum */
- for (x = 6, csum = 0; x < len - 6; x++)
- csum += data[x];
- if (csum != nvram->checksum)
- return 1;
-
- return 0;
-}
-
-/*
- * 93C46 EEPROM reading.
- *
- * GPOI0 - data in
- * GPIO1 - data out
- * GPIO2 - clock
- * GPIO4 - chip select
- *
- * Used by Tekram.
- */
-
-/*
- * Pulse clock bit in GPIO0
- */
-static void __init T93C46_Clk(ncr_slot *np, u_char *gpreg)
-{
- OUTB (nc_gpreg, *gpreg | 0x04);
- UDELAY (2);
- OUTB (nc_gpreg, *gpreg);
-}
-
-/*
- * Read bit from NVRAM
- */
-static void __init T93C46_Read_Bit(ncr_slot *np, u_char *read_bit, u_char *gpreg)
-{
- UDELAY (2);
- T93C46_Clk(np, gpreg);
- *read_bit = INB (nc_gpreg);
-}
-
-/*
- * Write bit to GPIO0
- */
-static void __init T93C46_Write_Bit(ncr_slot *np, u_char write_bit, u_char *gpreg)
-{
- if (write_bit & 0x01)
- *gpreg |= 0x02;
- else
- *gpreg &= 0xfd;
-
- *gpreg |= 0x10;
-
- OUTB (nc_gpreg, *gpreg);
- UDELAY (2);
-
- T93C46_Clk(np, gpreg);
-}
-
-/*
- * Send STOP condition to NVRAM - puts NVRAM to sleep... ZZZzzz!!
- */
-static void __init T93C46_Stop(ncr_slot *np, u_char *gpreg)
-{
- *gpreg &= 0xef;
- OUTB (nc_gpreg, *gpreg);
- UDELAY (2);
-
- T93C46_Clk(np, gpreg);
-}
-
-/*
- * Send read command and address to NVRAM
- */
-static void __init
-T93C46_Send_Command(ncr_slot *np, u_short write_data,
- u_char *read_bit, u_char *gpreg)
-{
- int x;
-
- /* send 9 bits, start bit (1), command (2), address (6) */
- for (x = 0; x < 9; x++)
- T93C46_Write_Bit(np, (u_char) (write_data >> (8 - x)), gpreg);
-
- *read_bit = INB (nc_gpreg);
-}
-
-/*
- * READ 2 bytes from the NVRAM
- */
-static void __init
-T93C46_Read_Word(ncr_slot *np, u_short *nvram_data, u_char *gpreg)
-{
- int x;
- u_char read_bit;
-
- *nvram_data = 0;
- for (x = 0; x < 16; x++) {
- T93C46_Read_Bit(np, &read_bit, gpreg);
-
- if (read_bit & 0x01)
- *nvram_data |= (0x01 << (15 - x));
- else
- *nvram_data &= ~(0x01 << (15 - x));
- }
-}
-
-/*
- * Read Tekram NvRAM data.
- */
-static int __init
-T93C46_Read_Data(ncr_slot *np, u_short *data,int len,u_char *gpreg)
-{
- u_char read_bit;
- int x;
-
- for (x = 0; x < len; x++) {
-
- /* output read command and address */
- T93C46_Send_Command(np, 0x180 | x, &read_bit, gpreg);
- if (read_bit & 0x01)
- return 1; /* Bad */
- T93C46_Read_Word(np, &data[x], gpreg);
- T93C46_Stop(np, gpreg);
- }
-
- return 0;
-}
-
-/*
- * Try reading 93C46 Tekram NVRAM.
- */
-static int __init
-sym_read_T93C46_nvram (ncr_slot *np, Tekram_nvram *nvram)
-{
- u_char gpcntl, gpreg;
- u_char old_gpcntl, old_gpreg;
- int retv = 1;
-
- /* save current state of GPCNTL and GPREG */
- old_gpreg = INB (nc_gpreg);
- old_gpcntl = INB (nc_gpcntl);
-
- /* set up GPREG & GPCNTL to set GPIO0/1/2/4 in to known state, 0 in,
- 1/2/4 out */
- gpreg = old_gpreg & 0xe9;
- OUTB (nc_gpreg, gpreg);
- gpcntl = (old_gpcntl & 0xe9) | 0x09;
- OUTB (nc_gpcntl, gpcntl);
-
- /* input all of NVRAM, 64 words */
- retv = T93C46_Read_Data(np, (u_short *) nvram,
- sizeof(*nvram) / sizeof(short), &gpreg);
-
- /* return GPIO0/1/2/4 to original states after having accessed NVRAM */
- OUTB (nc_gpcntl, old_gpcntl);
- OUTB (nc_gpreg, old_gpreg);
-
- return retv;
-}
-
-/*
- * Try reading Tekram NVRAM.
- * Return 0 if OK.
- */
-static int __init
-sym_read_Tekram_nvram (ncr_slot *np, u_short device_id, Tekram_nvram *nvram)
-{
- u_char *data = (u_char *) nvram;
- int len = sizeof(*nvram);
- u_short csum;
- int x;
-
- switch (device_id) {
- case PCI_DEVICE_ID_NCR_53C885:
- case PCI_DEVICE_ID_NCR_53C895:
- case PCI_DEVICE_ID_NCR_53C896:
- x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
- data, len);
- break;
- case PCI_DEVICE_ID_NCR_53C875:
- x = sym_read_S24C16_nvram(np, TEKRAM_24C16_NVRAM_ADDRESS,
- data, len);
- if (!x)
- break;
- default:
- x = sym_read_T93C46_nvram(np, nvram);
- break;
- }
- if (x)
- return 1;
-
- /* verify checksum */
- for (x = 0, csum = 0; x < len - 1; x += 2)
- csum += data[x] + (data[x+1] << 8);
- if (csum != 0x1234)
- return 1;
-
- return 0;
-}
-
-#endif /* SCSI_NCR_NVRAM_SUPPORT */
-
-/*===================================================================
-**
-** Detect and try to read SYMBIOS and TEKRAM NVRAM.
-**
-** Data can be used to order booting of boards.
-**
-** Data is saved in ncr_device structure if NVRAM found. This
-** is then used to find drive boot order for ncr_attach().
-**
-** NVRAM data is passed to Scsi_Host_Template later during
-** ncr_attach() for any device set up.
-**
-**===================================================================
-*/
-#ifdef SCSI_NCR_NVRAM_SUPPORT
-static void __init ncr_get_nvram(struct ncr_device *devp, ncr_nvram *nvp)
-{
- devp->nvram = nvp;
- if (!nvp)
- return;
- /*
- ** Get access to chip IO registers
- */
-#ifdef SCSI_NCR_IOMAPPED
- request_region(devp->slot.io_port, 128, NAME53C8XX);
- devp->slot.base_io = devp->slot.io_port;
-#else
- devp->slot.reg =
- (struct ncr_reg *) remap_pci_mem(devp->slot.base_c, 128);
- if (!devp->slot.reg)
- return;
-#endif
-
- /*
- ** Try to read SYMBIOS nvram.
- ** Try to read TEKRAM nvram if Symbios nvram not found.
- */
- if (!sym_read_Symbios_nvram(&devp->slot, &nvp->data.Symbios))
- nvp->type = SCSI_NCR_SYMBIOS_NVRAM;
- else if (!sym_read_Tekram_nvram(&devp->slot, devp->chip.device_id,
- &nvp->data.Tekram))
- nvp->type = SCSI_NCR_TEKRAM_NVRAM;
- else {
- nvp->type = 0;
- devp->nvram = 0;
- }
-
- /*
- ** Release access to chip IO registers
- */
-#ifdef SCSI_NCR_IOMAPPED
- release_region(devp->slot.base_io, 128);
-#else
- unmap_pci_mem((u_long) devp->slot.reg, 128ul);
-#endif
-
-}
-
-/*===================================================================
-**
-** Display the content of NVRAM for debugging purpose.
-**
-**===================================================================
-*/
-#ifdef SCSI_NCR_DEBUG_NVRAM
-static void __init ncr_display_Symbios_nvram(Symbios_nvram *nvram)
-{
- int i;
-
- /* display Symbios nvram host data */
- printk(KERN_DEBUG NAME53C8XX ": HOST ID=%d%s%s%s%s%s\n",
- nvram->host_id & 0x0f,
- (nvram->flags & SYMBIOS_SCAM_ENABLE) ? " SCAM" :"",
- (nvram->flags & SYMBIOS_PARITY_ENABLE) ? " PARITY" :"",
- (nvram->flags & SYMBIOS_VERBOSE_MSGS) ? " VERBOSE" :"",
- (nvram->flags & SYMBIOS_CHS_MAPPING) ? " CHS_ALT" :"",
- (nvram->flags1 & SYMBIOS_SCAN_HI_LO) ? " HI_LO" :"");
-
- /* display Symbios nvram drive data */
- for (i = 0 ; i < 15 ; i++) {
- struct Symbios_target *tn = &nvram->target[i];
- printk(KERN_DEBUG NAME53C8XX
- "-%d:%s%s%s%s WIDTH=%d SYNC=%d TMO=%d\n",
- i,
- (tn->flags & SYMBIOS_DISCONNECT_ENABLE) ? " DISC" : "",
- (tn->flags & SYMBIOS_SCAN_AT_BOOT_TIME) ? " SCAN_BOOT" : "",
- (tn->flags & SYMBIOS_SCAN_LUNS) ? " SCAN_LUNS" : "",
- (tn->flags & SYMBIOS_QUEUE_TAGS_ENABLED)? " TCQ" : "",
- tn->bus_width,
- tn->sync_period / 4,
- tn->timeout);
- }
-}
-
-static u_char Tekram_boot_delay[7] __initdata = {3, 5, 10, 20, 30, 60, 120};
-
-static void __init ncr_display_Tekram_nvram(Tekram_nvram *nvram)
-{
- int i, tags, boot_delay;
- char *rem;
-
- /* display Tekram nvram host data */
- tags = 2 << nvram->max_tags_index;
- boot_delay = 0;
- if (nvram->boot_delay_index < 6)
- boot_delay = Tekram_boot_delay[nvram->boot_delay_index];
- switch((nvram->flags & TEKRAM_REMOVABLE_FLAGS) >> 6) {
- default:
- case 0: rem = ""; break;
- case 1: rem = " REMOVABLE=boot device"; break;
- case 2: rem = " REMOVABLE=all"; break;
- }
-
- printk(KERN_DEBUG NAME53C8XX
- ": HOST ID=%d%s%s%s%s%s%s%s%s%s BOOT DELAY=%d tags=%d\n",
- nvram->host_id & 0x0f,
- (nvram->flags1 & SYMBIOS_SCAM_ENABLE) ? " SCAM" :"",
- (nvram->flags & TEKRAM_MORE_THAN_2_DRIVES) ? " >2DRIVES":"",
- (nvram->flags & TEKRAM_DRIVES_SUP_1GB) ? " >1GB" :"",
- (nvram->flags & TEKRAM_RESET_ON_POWER_ON) ? " RESET" :"",
- (nvram->flags & TEKRAM_ACTIVE_NEGATION) ? " ACT_NEG" :"",
- (nvram->flags & TEKRAM_IMMEDIATE_SEEK) ? " IMM_SEEK" :"",
- (nvram->flags & TEKRAM_SCAN_LUNS) ? " SCAN_LUNS" :"",
- (nvram->flags1 & TEKRAM_F2_F6_ENABLED) ? " F2_F6" :"",
- rem, boot_delay, tags);
-
- /* display Tekram nvram drive data */
- for (i = 0; i <= 15; i++) {
- int sync, j;
- struct Tekram_target *tn = &nvram->target[i];
- j = tn->sync_index & 0xf;
- sync = Tekram_sync[j];
- printk(KERN_DEBUG NAME53C8XX "-%d:%s%s%s%s%s%s PERIOD=%d\n",
- i,
- (tn->flags & TEKRAM_PARITY_CHECK) ? " PARITY" : "",
- (tn->flags & TEKRAM_SYNC_NEGO) ? " SYNC" : "",
- (tn->flags & TEKRAM_DISCONNECT_ENABLE) ? " DISC" : "",
- (tn->flags & TEKRAM_START_CMD) ? " START" : "",
- (tn->flags & TEKRAM_TAGGED_COMMANDS) ? " TCQ" : "",
- (tn->flags & TEKRAM_WIDE_NEGO) ? " WIDE" : "",
- sync);
- }
-}
-#endif /* SCSI_NCR_DEBUG_NVRAM */
-#endif /* SCSI_NCR_NVRAM_SUPPORT */
-
-