socal.c

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/* socal.c: Sparc SUNW,socal (SOC+) Fibre Channel Sbus adapter support.
 *
 * Copyright (C) 1998,1999 Jakub Jelinek ([e-mail])
 *
 * Sources:
 *	Fibre Channel Physical & Signaling Interface (FC-PH), dpANS, 1994
 *	dpANS Fibre Channel Protocol for SCSI (X3.269-199X), Rev. 012, 1995
 *	SOC+ Programming Guide 0.1
 *	Fibre Channel Arbitrated Loop (FC-AL), dpANS rev. 4.5, 1995
 *
 * Supported hardware:
 *      On-board SOC+ adapters of Ultra Enterprise servers and sun4d.
 */

static char *version =
        "socal.c: SOC+ driver v1.1 9/Feb/99 Jakub Jelinek ([e-mail])\n";

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/errno.h>
#include <asm/byteorder.h>

#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/auxio.h>
#include <asm/pgtable.h>
#include <asm/irq.h>

/* #define SOCALDEBUG */
/* #define HAVE_SOCAL_UCODE */
/* #define USE_64BIT_MODE */

#include "fcp_impl.h"
#include "socal.h"
#ifdef HAVE_SOCAL_UCODE
#include "socal_asm.h"
#endif

#define socal_printk printk ("socal%d: ", s->socal_no); printk 

#ifdef SOCALDEBUG
#define SOD(x)  socal_printk x;
#else
#define SOD(x)
#endif

#define for_each_socal(s) for (s = socals; s; s = s->next)
struct socal *socals = NULL;

static void socal_copy_from_xram(void *d, unsigned long xram, long size)
{
	u32 *dp = (u32 *) d;
	while (size) {
		*dp++ = sbus_readl(xram);
		xram += sizeof(u32);
		size -= sizeof(u32);
	}
}

static void socal_copy_to_xram(unsigned long xram, void *s, long size)
{
	u32 *sp = (u32 *) s;
	while (size) {
		u32 val = *sp++;
		sbus_writel(val, xram);
		xram += sizeof(u32);
		size -= sizeof(u32);
	}
}

#ifdef HAVE_SOCAL_UCODE
static void socal_bzero(unsigned long xram, int size)
{
	while (size) {
		sbus_writel(0, xram);
		xram += sizeof(u32);
		size -= sizeof(u32);
	}
}
#endif

static inline void socal_disable(struct socal *s)
{
	sbus_writel(0, s->regs + IMASK);
	sbus_writel(SOCAL_CMD_SOFT_RESET, s->regs + CMD);
}

static inline void socal_enable(struct socal *s)
{
	SOD(("enable %08x\n", s->cfg))
	sbus_writel(0, s->regs + SAE);
	sbus_writel(s->cfg, s->regs + CFG);
	sbus_writel(SOCAL_CMD_RSP_QALL, s->regs + CMD);
	SOCAL_SETIMASK(s, SOCAL_IMASK_RSP_QALL | SOCAL_IMASK_SAE);
	SOD(("imask %08x %08x\n", s->imask, sbus_readl(s->regs + IMASK)));
}

static void socal_reset(fc_channel *fc)
{
	socal_port *port = (socal_port *)fc;
	struct socal *s = port->s;
	
	/* FIXME */
	socal_disable(s);
	s->req[0].seqno = 1;
	s->req[1].seqno = 1;
	s->rsp[0].seqno = 1;
	s->rsp[1].seqno = 1;
	s->req[0].in = 0;
	s->req[1].in = 0;
	s->rsp[0].in = 0;
	s->rsp[1].in = 0;
	s->req[0].out = 0;
	s->req[1].out = 0;
	s->rsp[0].out = 0;
	s->rsp[1].out = 0;

	/* FIXME */
	socal_enable(s);
}

static void inline socal_solicited(struct socal *s, unsigned long qno)
{
	socal_rsp *hwrsp;
	socal_cq *sw_cq;
	int token;
	int status;
	fc_channel *fc;

	sw_cq = &s->rsp[qno];

	/* Finally an improvement against old SOC :) */
	sw_cq->in = sbus_readb(s->regs + RESP + qno);
	SOD (("socal_solicited, %d packets arrived\n",
	      (sw_cq->in - sw_cq->out) & sw_cq->last))
	for (;;) {
		hwrsp = (socal_rsp *)sw_cq->pool + sw_cq->out;
		SOD(("hwrsp %p out %d\n", hwrsp, sw_cq->out))
		
#if defined(SOCALDEBUG) && 0
		{
		u32 *u = (u32 *)hwrsp;
		SOD(("%08x.%08x.%08x.%08x.%08x.%08x.%08x.%08x\n",
		     u[0],u[1],u[2],u[3],u[4],u[5],u[6],u[7]))
		u += 8;
		SOD(("%08x.%08x.%08x.%08x.%08x.%08x.%08x.%08x\n",
		     u[0],u[1],u[2],u[3],u[4],u[5],u[6],u[7]))
		u = (u32 *)s->xram;
		while (u < ((u32 *)s->regs)) {
			if (sbus_readl(&u[0]) == 0x00003000 ||
			    sbus_readl(&u[0]) == 0x00003801) {
			SOD(("Found at %04lx\n",
			     (unsigned long)u - (unsigned long)s->xram))
			SOD(("  %08x.%08x.%08x.%08x.%08x.%08x.%08x.%08x\n",
			     sbus_readl(&u[0]), sbus_readl(&u[1]),
			     sbus_readl(&u[2]), sbus_readl(&u[3]),
			     sbus_readl(&u[4]), sbus_readl(&u[5]),
			     sbus_readl(&u[6]), sbus_readl(&u[7])))
			u += 8;
			SOD(("  %08x.%08x.%08x.%08x.%08x.%08x.%08x.%08x\n",
			     sbus_readl(&u[0]), sbus_readl(&u[1]),
			     sbus_readl(&u[2]), sbus_readl(&u[3]),
			     sbus_readl(&u[4]), sbus_readl(&u[5]),
			     sbus_readl(&u[6]), sbus_readl(&u[7])))
			u -= 8;
			}
			u++;
		}
		}
#endif

		token = hwrsp->shdr.token;
		status = hwrsp->status;
		fc = (fc_channel *)(&s->port[(token >> 11) & 1]);
		
		SOD(("Solicited token %08x status %08x\n", token, status))
		if (status == SOCAL_OK) {
			fcp_receive_solicited(fc, token >> 12,
					      token & ((1 << 11) - 1),
					      FC_STATUS_OK, NULL);
		} else {
			/* We have intentionally defined FC_STATUS_* constants
			 * to match SOCAL_* constants, otherwise we'd have to
			 * translate status.
			 */
			fcp_receive_solicited(fc, token >> 12,
					      token & ((1 << 11) - 1), status, &hwrsp->fchdr);
		}
			
		if (++sw_cq->out > sw_cq->last) {
			sw_cq->seqno++;
			sw_cq->out = 0;
		}
		
		if (sw_cq->out == sw_cq->in) {
			sw_cq->in = sbus_readb(s->regs + RESP + qno);
			if (sw_cq->out == sw_cq->in) {
				/* Tell the hardware about it */
				sbus_writel((sw_cq->out << 24) |
					    (SOCAL_CMD_RSP_QALL &
					     ~(SOCAL_CMD_RSP_Q0 << qno)),
					    s->regs + CMD);

				/* Read it, so that we're sure it has been updated */
				sbus_readl(s->regs + CMD);
				sw_cq->in = sbus_readb(s->regs + RESP + qno);
				if (sw_cq->out == sw_cq->in)
					break;
			}
		}
	}
}

static void inline socal_request (struct socal *s, u32 cmd)
{
	SOCAL_SETIMASK(s, s->imask & ~(cmd & SOCAL_CMD_REQ_QALL));
	SOD(("imask %08x %08x\n", s->imask, sbus_readl(s->regs + IMASK)));

	SOD(("Queues available %08x OUT %X\n", cmd, s->regs->reqpr[0]))
	if (s->port[s->curr_port].fc.state != FC_STATE_OFFLINE) {
		fcp_queue_empty ((fc_channel *)&(s->port[s->curr_port]));
		if (((s->req[1].in + 1) & s->req[1].last) != (s->req[1].out))
			fcp_queue_empty ((fc_channel *)&(s->port[1 - s->curr_port]));
	} else {
		fcp_queue_empty ((fc_channel *)&(s->port[1 - s->curr_port]));
	}
	if (s->port[1 - s->curr_port].fc.state != FC_STATE_OFFLINE)
		s->curr_port ^= 1;
}

static void inline socal_unsolicited (struct socal *s, unsigned long qno)
{
	socal_rsp *hwrsp, *hwrspc;
	socal_cq *sw_cq;
	int count;
	int status;
	int flags;
	fc_channel *fc;

	sw_cq = &s->rsp[qno];

	sw_cq->in = sbus_readb(s->regs + RESP + qno);
	SOD (("socal_unsolicited, %d packets arrived, in %d\n",
	      (sw_cq->in - sw_cq->out) & sw_cq->last, sw_cq->in))
	while (sw_cq->in != sw_cq->out) {
		/* ...real work per entry here... */
		hwrsp = (socal_rsp *)sw_cq->pool + sw_cq->out;
		SOD(("hwrsp %p out %d\n", hwrsp, sw_cq->out))

#if defined(SOCALDEBUG) && 0
		{
		u32 *u = (u32 *)hwrsp;
		SOD(("%08x.%08x.%08x.%08x.%08x.%08x.%08x.%08x\n",
		     u[0],u[1],u[2],u[3],u[4],u[5],u[6],u[7]))
		u += 8;
		SOD(("%08x.%08x.%08x.%08x.%08x.%08x.%08x.%08x\n",
		     u[0],u[1],u[2],u[3],u[4],u[5],u[6],u[7]))
		}
#endif

		hwrspc = NULL;
		flags = hwrsp->shdr.flags;
		count = hwrsp->count;
		fc = (fc_channel *)&s->port[flags & SOCAL_PORT_B];
		SOD(("FC %08lx\n", (long)fc))
		
		if (count != 1) {
			/* Ugh, continuation entries */
			u8 in;

			if (count != 2) {
				printk("%s: Too many continuations entries %d\n",
				       fc->name, count);
				goto update_out;
			}
			
			in = sw_cq->in;
			if (in < sw_cq->out)
				in += sw_cq->last + 1;
			if (in < sw_cq->out + 2) {
				/* Ask the hardware if they haven't arrived yet. */
				sbus_writel((sw_cq->out << 24) |
					    (SOCAL_CMD_RSP_QALL &
					     ~(SOCAL_CMD_RSP_Q0 << qno)),
					    s->regs + CMD);

				/* Read it, so that we're sure it has been updated */
				sbus_readl(s->regs + CMD);
				sw_cq->in = sbus_readb(s->regs + RESP + qno);
				in = sw_cq->in;
				if (in < sw_cq->out)
					in += sw_cq->last + 1;
				if (in < sw_cq->out + 2) /* Nothing came, let us wait */
					return;
			}
			if (sw_cq->out == sw_cq->last)
				hwrspc = (socal_rsp *)sw_cq->pool;
			else
				hwrspc = hwrsp + 1;
		}
		
		switch (flags & ~SOCAL_PORT_B) {
		case SOCAL_STATUS:
			status = hwrsp->status;
			switch (status) {
			case SOCAL_ONLINE:
				SOD(("State change to ONLINE\n"));
				fcp_state_change(fc, FC_STATE_ONLINE);
				break;
			case SOCAL_ONLINE_LOOP:
				SOD(("State change to ONLINE_LOOP\n"));
				fcp_state_change(fc, FC_STATE_ONLINE);
				break;
			case SOCAL_OFFLINE:
				SOD(("State change to OFFLINE\n"));
				fcp_state_change(fc, FC_STATE_OFFLINE);
				break;
			default:
				printk ("%s: Unknown STATUS no %d\n",
					fc->name, status);
				break;
			};

			break;
		case (SOCAL_UNSOLICITED|SOCAL_FC_HDR):
			{
				int r_ctl = *((u8 *)&hwrsp->fchdr);
				unsigned len;
				
				if ((r_ctl & 0xf0) == R_CTL_EXTENDED_SVC) {
					len = hwrsp->shdr.bytecnt;
					if (len < 4 || !hwrspc) {
						printk ("%s: Invalid R_CTL %02x "
							"continuation entries\n",
							fc->name, r_ctl);
					} else {
						if (len > 60)
							len = 60;
						if (*(u32 *)hwrspc == LS_DISPLAY) {
							int i;
							
							for (i = 4; i < len; i++)
								if (((u8 *)hwrspc)[i] == '\n')
									((u8 *)hwrspc)[i] = ' ';
							((u8 *)hwrspc)[len] = 0;
							printk ("%s message: %s\n",
								fc->name, ((u8 *)hwrspc) + 4);
						} else {
							printk ("%s: Unknown LS_CMD "
								"%08x\n", fc->name,
								*(u32 *)hwrspc);
						}
					}
				} else {
					printk ("%s: Unsolicited R_CTL %02x "
						"not handled\n", fc->name, r_ctl);
				}
			}
			break;
		default:
			printk ("%s: Unexpected flags %08x\n", fc->name, flags);
			break;
		};
update_out:
		if (++sw_cq->out > sw_cq->last) {
			sw_cq->seqno++;
			sw_cq->out = 0;
		}
		
		if (hwrspc) {
			if (++sw_cq->out > sw_cq->last) {
				sw_cq->seqno++;
				sw_cq->out = 0;
			}
		}
		
		if (sw_cq->out == sw_cq->in) {
			sw_cq->in = sbus_readb(s->regs + RESP + qno);
			if (sw_cq->out == sw_cq->in) {
				/* Tell the hardware about it */
				sbus_writel((sw_cq->out << 24) |
					    (SOCAL_CMD_RSP_QALL &
					     ~(SOCAL_CMD_RSP_Q0 << qno)),
					    s->regs + CMD);

				/* Read it, so that we're sure it has been updated */
				sbus_readl(s->regs + CMD);
				sw_cq->in = sbus_readb(s->regs + RESP + qno);
			}
		}
	}
}

static void socal_intr(int irq, void *dev_id, struct pt_regs *regs)
{
	u32 cmd;
	unsigned long flags;
	register struct socal *s = (struct socal *)dev_id;

	spin_lock_irqsave(&io_request_lock, flags);
	cmd = sbus_readl(s->regs + CMD);
	for (; (cmd = SOCAL_INTR (s, cmd)); cmd = sbus_readl(s->regs + CMD)) {
#ifdef SOCALDEBUG
		static int cnt = 0;
		if (cnt++ < 50)
			printk("soc_intr %08x\n", cmd);
#endif	
		if (cmd & SOCAL_CMD_RSP_Q2)
			socal_unsolicited (s, SOCAL_UNSOLICITED_RSP_Q);
		if (cmd & SOCAL_CMD_RSP_Q1)
			socal_unsolicited (s, SOCAL_SOLICITED_BAD_RSP_Q);
		if (cmd & SOCAL_CMD_RSP_Q0)
			socal_solicited (s, SOCAL_SOLICITED_RSP_Q);
		if (cmd & SOCAL_CMD_REQ_QALL)
			socal_request (s, cmd);
	}
	spin_unlock_irqrestore(&io_request_lock, flags);
}

#define TOKEN(proto, port, token) (((proto)<<12)|(token)|(port))

static int socal_hw_enque (fc_channel *fc, fcp_cmnd *fcmd)
{
	socal_port *port = (socal_port *)fc;
	struct socal *s = port->s;
	unsigned long qno;
	socal_cq *sw_cq;
	int cq_next_in;
	socal_req *request;
	fc_hdr *fch;
	int i;

	if (fcmd->proto == TYPE_SCSI_FCP)
		qno = 1;
	else
		qno = 0;
	SOD(("Putting a FCP packet type %d into hw queue %d\n", fcmd->proto, qno))
	if (s->imask & (SOCAL_IMASK_REQ_Q0 << qno)) {
		SOD(("EIO %08x\n", s->imask))
		return -EIO;