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ixp4xx_npe.c

/*
 * Intel IXP4xx Network Processor Engine driver for Linux
 *
 * Copyright (C) 2007 Krzysztof Halasa <khc@pm.waw.pl>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License
 * as published by the Free Software Foundation.
 *
 * The code is based on publicly available information:
 * - Intel IXP4xx Developer's Manual and other e-papers
 * - Intel IXP400 Access Library Software (BSD license)
 * - previous works by Christian Hohnstaedt <chohnstaedt@innominate.com>
 *   Thanks, Christian.
 */

#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/firmware.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/arch/npe.h>

#define DEBUG_MSG             0
#define DEBUG_FW              0

#define NPE_COUNT             3
#define MAX_RETRIES                 1000  /* microseconds */
#define NPE_42X_DATA_SIZE           0x800 /* in dwords */
#define NPE_46X_DATA_SIZE           0x1000
#define NPE_A_42X_INSTR_SIZE        0x1000
#define NPE_B_AND_C_42X_INSTR_SIZE  0x800
#define NPE_46X_INSTR_SIZE          0x1000
#define REGS_SIZE             0x1000

#define NPE_PHYS_REG                32

#define FW_MAGIC              0xFEEDF00D
#define FW_BLOCK_TYPE_INSTR         0x0
#define FW_BLOCK_TYPE_DATA          0x1
#define FW_BLOCK_TYPE_EOF           0xF

/* NPE exec status (read) and command (write) */
#define CMD_NPE_STEP                0x01
#define CMD_NPE_START               0x02
#define CMD_NPE_STOP                0x03
#define CMD_NPE_CLR_PIPE            0x04
#define CMD_CLR_PROFILE_CNT         0x0C
#define CMD_RD_INS_MEM              0x10 /* instruction memory */
#define CMD_WR_INS_MEM              0x11
#define CMD_RD_DATA_MEM             0x12 /* data memory */
#define CMD_WR_DATA_MEM             0x13
#define CMD_RD_ECS_REG              0x14 /* exec access register */
#define CMD_WR_ECS_REG              0x15

#define STAT_RUN              0x80000000
#define STAT_STOP             0x40000000
#define STAT_CLEAR                  0x20000000
#define STAT_ECS_K                  0x00800000 /* pipeline clean */

#define NPE_STEVT             0x1B
#define NPE_STARTPC                 0x1C
#define NPE_REGMAP                  0x1E
#define NPE_CINDEX                  0x1F

#define INSTR_WR_REG_SHORT          0x0000C000
#define INSTR_WR_REG_BYTE           0x00004000
#define INSTR_RD_FIFO               0x0F888220
#define INSTR_RESET_MBOX            0x0FAC8210

#define ECS_BG_CTXT_REG_0           0x00 /* Background Executing Context */
#define ECS_BG_CTXT_REG_1           0x01 /*           Stack level */
#define ECS_BG_CTXT_REG_2           0x02
#define ECS_PRI_1_CTXT_REG_0        0x04 /* Priority 1 Executing Context */
#define ECS_PRI_1_CTXT_REG_1        0x05 /*           Stack level */
#define ECS_PRI_1_CTXT_REG_2        0x06
#define ECS_PRI_2_CTXT_REG_0        0x08 /* Priority 2 Executing Context */
#define ECS_PRI_2_CTXT_REG_1        0x09 /*           Stack level */
#define ECS_PRI_2_CTXT_REG_2        0x0A
#define ECS_DBG_CTXT_REG_0          0x0C /* Debug Executing Context */
#define ECS_DBG_CTXT_REG_1          0x0D /*           Stack level */
#define ECS_DBG_CTXT_REG_2          0x0E
#define ECS_INSTRUCT_REG            0x11 /* NPE Instruction Register */

#define ECS_REG_0_ACTIVE            0x80000000 /* all levels */
#define ECS_REG_0_NEXTPC_MASK       0x1FFF0000 /* BG/PRI1/PRI2 levels */
#define ECS_REG_0_LDUR_BITS         8
#define ECS_REG_0_LDUR_MASK         0x00000700 /* all levels */
#define ECS_REG_1_CCTXT_BITS        16
#define ECS_REG_1_CCTXT_MASK        0x000F0000 /* all levels */
#define ECS_REG_1_SELCTXT_BITS            0
#define ECS_REG_1_SELCTXT_MASK            0x0000000F /* all levels */
#define ECS_DBG_REG_2_IF            0x00100000 /* debug level */
#define ECS_DBG_REG_2_IE            0x00080000 /* debug level */

/* NPE watchpoint_fifo register bit */
#define WFIFO_VALID                 0x80000000

/* NPE messaging_status register bit definitions */
#define MSGSTAT_OFNE    0x00010000 /* OutFifoNotEmpty */
#define MSGSTAT_IFNF    0x00020000 /* InFifoNotFull */
#define MSGSTAT_OFNF    0x00040000 /* OutFifoNotFull */
#define MSGSTAT_IFNE    0x00080000 /* InFifoNotEmpty */
#define MSGSTAT_MBINT   0x00100000 /* Mailbox interrupt */
#define MSGSTAT_IFINT   0x00200000 /* InFifo interrupt */
#define MSGSTAT_OFINT   0x00400000 /* OutFifo interrupt */
#define MSGSTAT_WFINT   0x00800000 /* WatchFifo interrupt */

/* NPE messaging_control register bit definitions */
#define MSGCTL_OUT_FIFO             0x00010000 /* enable output FIFO */
#define MSGCTL_IN_FIFO              0x00020000 /* enable input FIFO */
#define MSGCTL_OUT_FIFO_WRITE       0x01000000 /* enable FIFO + WRITE */
#define MSGCTL_IN_FIFO_WRITE        0x02000000

/* NPE mailbox_status value for reset */
#define RESET_MBOX_STAT             0x0000F0F0

const char *npe_names[] = { "NPE-A", "NPE-B", "NPE-C" };

#define print_npe(pri, npe, fmt, ...)                             \
      printk(pri "%s: " fmt, npe_name(npe), ## __VA_ARGS__)

#if DEBUG_MSG
#define debug_msg(npe, fmt, ...)                            \
      print_npe(KERN_DEBUG, npe, fmt, ## __VA_ARGS__)
#else
#define debug_msg(npe, fmt, ...)
#endif

static struct {
      u32 reg, val;
} ecs_reset[] = {
      { ECS_BG_CTXT_REG_0,    0xA0000000 },
      { ECS_BG_CTXT_REG_1,    0x01000000 },
      { ECS_BG_CTXT_REG_2,    0x00008000 },
      { ECS_PRI_1_CTXT_REG_0, 0x20000080 },
      { ECS_PRI_1_CTXT_REG_1, 0x01000000 },
      { ECS_PRI_1_CTXT_REG_2, 0x00008000 },
      { ECS_PRI_2_CTXT_REG_0, 0x20000080 },
      { ECS_PRI_2_CTXT_REG_1, 0x01000000 },
      { ECS_PRI_2_CTXT_REG_2, 0x00008000 },
      { ECS_DBG_CTXT_REG_0,   0x20000000 },
      { ECS_DBG_CTXT_REG_1,   0x00000000 },
      { ECS_DBG_CTXT_REG_2,   0x001E0000 },
      { ECS_INSTRUCT_REG,     0x1003C00F },
};

static struct npe npe_tab[NPE_COUNT] = {
      {
            .id   = 0,
            .regs = (struct npe_regs __iomem *)IXP4XX_NPEA_BASE_VIRT,
            .regs_phys = IXP4XX_NPEA_BASE_PHYS,
      }, {
            .id   = 1,
            .regs = (struct npe_regs __iomem *)IXP4XX_NPEB_BASE_VIRT,
            .regs_phys = IXP4XX_NPEB_BASE_PHYS,
      }, {
            .id   = 2,
            .regs = (struct npe_regs __iomem *)IXP4XX_NPEC_BASE_VIRT,
            .regs_phys = IXP4XX_NPEC_BASE_PHYS,
      }
};

int npe_running(struct npe *npe)
{
      return (__raw_readl(&npe->regs->exec_status_cmd) & STAT_RUN) != 0;
}

static void npe_cmd_write(struct npe *npe, u32 addr, int cmd, u32 data)
{
      __raw_writel(data, &npe->regs->exec_data);
      __raw_writel(addr, &npe->regs->exec_addr);
      __raw_writel(cmd, &npe->regs->exec_status_cmd);
}

static u32 npe_cmd_read(struct npe *npe, u32 addr, int cmd)
{
      __raw_writel(addr, &npe->regs->exec_addr);
      __raw_writel(cmd, &npe->regs->exec_status_cmd);
      /* Iintroduce extra read cycles after issuing read command to NPE
         so that we read the register after the NPE has updated it.
         This is to overcome race condition between XScale and NPE */
      __raw_readl(&npe->regs->exec_data);
      __raw_readl(&npe->regs->exec_data);
      return __raw_readl(&npe->regs->exec_data);
}

static void npe_clear_active(struct npe *npe, u32 reg)
{
      u32 val = npe_cmd_read(npe, reg, CMD_RD_ECS_REG);
      npe_cmd_write(npe, reg, CMD_WR_ECS_REG, val & ~ECS_REG_0_ACTIVE);
}

static void npe_start(struct npe *npe)
{
      /* ensure only Background Context Stack Level is active */
      npe_clear_active(npe, ECS_PRI_1_CTXT_REG_0);
      npe_clear_active(npe, ECS_PRI_2_CTXT_REG_0);
      npe_clear_active(npe, ECS_DBG_CTXT_REG_0);

      __raw_writel(CMD_NPE_CLR_PIPE, &npe->regs->exec_status_cmd);
      __raw_writel(CMD_NPE_START, &npe->regs->exec_status_cmd);
}

static void npe_stop(struct npe *npe)
{
      __raw_writel(CMD_NPE_STOP, &npe->regs->exec_status_cmd);
      __raw_writel(CMD_NPE_CLR_PIPE, &npe->regs->exec_status_cmd); /*FIXME?*/
}

static int __must_check npe_debug_instr(struct npe *npe, u32 instr, u32 ctx,
                              u32 ldur)
{
      u32 wc;
      int i;

      /* set the Active bit, and the LDUR, in the debug level */
      npe_cmd_write(npe, ECS_DBG_CTXT_REG_0, CMD_WR_ECS_REG,
                  ECS_REG_0_ACTIVE | (ldur << ECS_REG_0_LDUR_BITS));

      /* set CCTXT at ECS DEBUG L3 to specify in which context to execute
         the instruction, and set SELCTXT at ECS DEBUG Level to specify
         which context store to access.
         Debug ECS Level Reg 1 has form 0x000n000n, where n = context number
      */
      npe_cmd_write(npe, ECS_DBG_CTXT_REG_1, CMD_WR_ECS_REG,
                  (ctx << ECS_REG_1_CCTXT_BITS) |
                  (ctx << ECS_REG_1_SELCTXT_BITS));

      /* clear the pipeline */
      __raw_writel(CMD_NPE_CLR_PIPE, &npe->regs->exec_status_cmd);

      /* load NPE instruction into the instruction register */
      npe_cmd_write(npe, ECS_INSTRUCT_REG, CMD_WR_ECS_REG, instr);

      /* we need this value later to wait for completion of NPE execution
         step */
      wc = __raw_readl(&npe->regs->watch_count);

      /* issue a Step One command via the Execution Control register */
      __raw_writel(CMD_NPE_STEP, &npe->regs->exec_status_cmd);

      /* Watch Count register increments when NPE completes an instruction */
      for (i = 0; i < MAX_RETRIES; i++) {
            if (wc != __raw_readl(&npe->regs->watch_count))
                  return 0;
            udelay(1);
      }

      print_npe(KERN_ERR, npe, "reset: npe_debug_instr(): timeout\n");
      return -ETIMEDOUT;
}

static int __must_check npe_logical_reg_write8(struct npe *npe, u32 addr,
                                     u8 val, u32 ctx)
{
      /* here we build the NPE assembler instruction: mov8 d0, #0 */
      u32 instr = INSTR_WR_REG_BYTE |     /* OpCode */
            addr << 9 |       /* base Operand */
            (val & 0x1F) << 4 |     /* lower 5 bits to immediate data */
            (val & ~0x1F) << (18 - 5);/* higher 3 bits to CoProc instr. */
      return npe_debug_instr(npe, instr, ctx, 1); /* execute it */
}

static int __must_check npe_logical_reg_write16(struct npe *npe, u32 addr,
                                    u16 val, u32 ctx)
{
      /* here we build the NPE assembler instruction: mov16 d0, #0 */
      u32 instr = INSTR_WR_REG_SHORT | /* OpCode */
            addr << 9 |       /* base Operand */
            (val & 0x1F) << 4 |     /* lower 5 bits to immediate data */
            (val & ~0x1F) << (18 - 5);/* higher 11 bits to CoProc instr. */
      return npe_debug_instr(npe, instr, ctx, 1); /* execute it */
}

static int __must_check npe_logical_reg_write32(struct npe *npe, u32 addr,
                                    u32 val, u32 ctx)
{
      /* write in 16 bit steps first the high and then the low value */
      if (npe_logical_reg_write16(npe, addr, val >> 16, ctx))
            return -ETIMEDOUT;
      return npe_logical_reg_write16(npe, addr + 2, val & 0xFFFF, ctx);
}

static int npe_reset(struct npe *npe)
{
      u32 val, ctl, exec_count, ctx_reg2;
      int i;

      ctl = (__raw_readl(&npe->regs->messaging_control) | 0x3F000000) &
            0x3F3FFFFF;

      /* disable parity interrupt */
      __raw_writel(ctl & 0x3F00FFFF, &npe->regs->messaging_control);

      /* pre exec - debug instruction */
      /* turn off the halt bit by clearing Execution Count register. */
      exec_count = __raw_readl(&npe->regs->exec_count);
      __raw_writel(0, &npe->regs->exec_count);
      /* ensure that IF and IE are on (temporarily), so that we don't end up
         stepping forever */
      ctx_reg2 = npe_cmd_read(npe, ECS_DBG_CTXT_REG_2, CMD_RD_ECS_REG);
      npe_cmd_write(npe, ECS_DBG_CTXT_REG_2, CMD_WR_ECS_REG, ctx_reg2 |
                  ECS_DBG_REG_2_IF | ECS_DBG_REG_2_IE);

      /* clear the FIFOs */
      while (__raw_readl(&npe->regs->watchpoint_fifo) & WFIFO_VALID)
            ;
      while (__raw_readl(&npe->regs->messaging_status) & MSGSTAT_OFNE)
            /* read from the outFIFO until empty */
            print_npe(KERN_DEBUG, npe, "npe_reset: read FIFO = 0x%X\n",
                    __raw_readl(&npe->regs->in_out_fifo));

      while (__raw_readl(&npe->regs->messaging_status) & MSGSTAT_IFNE)
            /* step execution of the NPE intruction to read inFIFO using
               the Debug Executing Context stack */
            if (npe_debug_instr(npe, INSTR_RD_FIFO, 0, 0))
                  return -ETIMEDOUT;

      /* reset the mailbox reg from the XScale side */
      __raw_writel(RESET_MBOX_STAT, &npe->regs->mailbox_status);
      /* from NPE side */
      if (npe_debug_instr(npe, INSTR_RESET_MBOX, 0, 0))
            return -ETIMEDOUT;

      /* Reset the physical registers in the NPE register file */
      for (val = 0; val < NPE_PHYS_REG; val++) {
            if (npe_logical_reg_write16(npe, NPE_REGMAP, val >> 1, 0))
                  return -ETIMEDOUT;
            /* address is either 0 or 4 */
            if (npe_logical_reg_write32(npe, (val & 1) * 4, 0, 0))
                  return -ETIMEDOUT;
      }

      /* Reset the context store = each context's Context Store registers */

      /* Context 0 has no STARTPC. Instead, this value is used to set NextPC
         for Background ECS, to set where NPE starts executing code */
      val = npe_cmd_read(npe, ECS_BG_CTXT_REG_0, CMD_RD_ECS_REG);
      val &= ~ECS_REG_0_NEXTPC_MASK;
      val |= (0 /* NextPC */ << 16) & ECS_REG_0_NEXTPC_MASK;
      npe_cmd_write(npe, ECS_BG_CTXT_REG_0, CMD_WR_ECS_REG, val);

      for (i = 0; i < 16; i++) {
            if (i) {    /* Context 0 has no STEVT nor STARTPC */
                  /* STEVT = off, 0x80 */
                  if (npe_logical_reg_write8(npe, NPE_STEVT, 0x80, i))
                        return -ETIMEDOUT;
                  if (npe_logical_reg_write16(npe, NPE_STARTPC, 0, i))
                        return -ETIMEDOUT;
            }
            /* REGMAP = d0->p0, d8->p2, d16->p4 */
            if (npe_logical_reg_write16(npe, NPE_REGMAP, 0x820, i))
                  return -ETIMEDOUT;
            if (npe_logical_reg_write8(npe, NPE_CINDEX, 0, i))
                  return -ETIMEDOUT;
      }

      /* post exec */
      /* clear active bit in debug level */
      npe_cmd_write(npe, ECS_DBG_CTXT_REG_0, CMD_WR_ECS_REG, 0);
      /* clear the pipeline */
      __raw_writel(CMD_NPE_CLR_PIPE, &npe->regs->exec_status_cmd);
      /* restore previous values */
      __raw_writel(exec_count, &npe->regs->exec_count);
      npe_cmd_write(npe, ECS_DBG_CTXT_REG_2, CMD_WR_ECS_REG, ctx_reg2);

      /* write reset values to Execution Context Stack registers */
      for (val = 0; val < ARRAY_SIZE(ecs_reset); val++)
            npe_cmd_write(npe, ecs_reset[val].reg, CMD_WR_ECS_REG,
                        ecs_reset[val].val);

      /* clear the profile counter */
      __raw_writel(CMD_CLR_PROFILE_CNT, &npe->regs->exec_status_cmd);

      __raw_writel(0, &npe->regs->exec_count);
      __raw_writel(0, &npe->regs->action_points[0]);
      __raw_writel(0, &npe->regs->action_points[1]);
      __raw_writel(0, &npe->regs->action_points[2]);
      __raw_writel(0, &npe->regs->action_points[3]);
      __raw_writel(0, &npe->regs->watch_count);

      val = ixp4xx_read_feature_bits();
      /* reset the NPE */
      ixp4xx_write_feature_bits(val &
                          ~(IXP4XX_FEATURE_RESET_NPEA << npe->id));
      for (i = 0; i < MAX_RETRIES; i++) {
            if (!(ixp4xx_read_feature_bits() &
                  (IXP4XX_FEATURE_RESET_NPEA << npe->id)))
                  break;      /* reset completed */
            udelay(1);
      }
      if (i == MAX_RETRIES)
            return -ETIMEDOUT;

      /* deassert reset */
      ixp4xx_write_feature_bits(val |
                          (IXP4XX_FEATURE_RESET_NPEA << npe->id));
      for (i = 0; i < MAX_RETRIES; i++) {
            if (ixp4xx_read_feature_bits() &
                (IXP4XX_FEATURE_RESET_NPEA << npe->id))
                  break;      /* NPE is back alive */
            udelay(1);
      }
      if (i == MAX_RETRIES)
            return -ETIMEDOUT;

      npe_stop(npe);

      /* restore NPE configuration bus Control Register - parity settings */
      __raw_writel(ctl, &npe->regs->messaging_control);
      return 0;
}


int npe_send_message(struct npe *npe, const void *msg, const char *what)
{
      const u32 *send = msg;
      int cycles = 0;

      debug_msg(npe, "Trying to send message %s [%08X:%08X]\n",
              what, send[0], send[1]);

      if (__raw_readl(&npe->regs->messaging_status) & MSGSTAT_IFNE) {
            debug_msg(npe, "NPE input FIFO not empty\n");
            return -EIO;
      }

      __raw_writel(send[0], &npe->regs->in_out_fifo);

      if (!(__raw_readl(&npe->regs->messaging_status) & MSGSTAT_IFNF)) {
            debug_msg(npe, "NPE input FIFO full\n");
            return -EIO;
      }

      __raw_writel(send[1], &npe->regs->in_out_fifo);

      while ((cycles < MAX_RETRIES) &&
             (__raw_readl(&npe->regs->messaging_status) & MSGSTAT_IFNE)) {
            udelay(1);
            cycles++;
      }

      if (cycles == MAX_RETRIES) {
            debug_msg(npe, "Timeout sending message\n");
            return -ETIMEDOUT;
      }

#if DEBUG_MSG > 1
      debug_msg(npe, "Sending a message took %i cycles\n", cycles);
#endif
      return 0;
}

int npe_recv_message(struct npe *npe, void *msg, const char *what)
{
      u32 *recv = msg;
      int cycles = 0, cnt = 0;

      debug_msg(npe, "Trying to receive message %s\n", what);

      while (cycles < MAX_RETRIES) {
            if (__raw_readl(&npe->regs->messaging_status) & MSGSTAT_OFNE) {
                  recv[cnt++] = __raw_readl(&npe->regs->in_out_fifo);
                  if (cnt == 2)
                        break;
            } else {
                  udelay(1);
                  cycles++;
            }
      }

      switch(cnt) {
      case 1:
            debug_msg(npe, "Received [%08X]\n", recv[0]);
            break;
      case 2:
            debug_msg(npe, "Received [%08X:%08X]\n", recv[0], recv[1]);
            break;
      }

      if (cycles == MAX_RETRIES) {
            debug_msg(npe, "Timeout waiting for message\n");
            return -ETIMEDOUT;
      }

#if DEBUG_MSG > 1
      debug_msg(npe, "Receiving a message took %i cycles\n", cycles);
#endif
      return 0;
}

int npe_send_recv_message(struct npe *npe, void *msg, const char *what)
{
      int result;
      u32 *send = msg, recv[2];

      if ((result = npe_send_message(npe, msg, what)) != 0)
            return result;
      if ((result = npe_recv_message(npe, recv, what)) != 0)
            return result;

      if ((recv[0] != send[0]) || (recv[1] != send[1])) {
            debug_msg(npe, "Message %s: unexpected message received\n",
                    what);
            return -EIO;
      }
      return 0;
}


int npe_load_firmware(struct npe *npe, const char *name, struct device *dev)
{
      const struct firmware *fw_entry;

      struct dl_block {
            u32 type;
            u32 offset;
      } *blk;

      struct dl_image {
            u32 magic;
            u32 id;
            u32 size;
            union {
                  u32 data[0];
                  struct dl_block blocks[0];
            };
      } *image;

      struct dl_codeblock {
            u32 npe_addr;
            u32 size;
            u32 data[0];
      } *cb;

      int i, j, err, data_size, instr_size, blocks, table_end;
      u32 cmd;

      if ((err = request_firmware(&fw_entry, name, dev)) != 0)
            return err;

      err = -EINVAL;
      if (fw_entry->size < sizeof(struct dl_image)) {
            print_npe(KERN_ERR, npe, "incomplete firmware file\n");
            goto err;
      }
      image = (struct dl_image*)fw_entry->data;

#if DEBUG_FW
      print_npe(KERN_DEBUG, npe, "firmware: %08X %08X %08X (0x%X bytes)\n",
              image->magic, image->id, image->size, image->size * 4);
#endif

      if (image->magic == swab32(FW_MAGIC)) { /* swapped file */
            image->id = swab32(image->id);
            image->size = swab32(image->size);
      } else if (image->magic != FW_MAGIC) {
            print_npe(KERN_ERR, npe, "bad firmware file magic: 0x%X\n",
                    image->magic);
            goto err;
      }
      if ((image->size * 4 + sizeof(struct dl_image)) != fw_entry->size) {
            print_npe(KERN_ERR, npe,
                    "inconsistent size of firmware file\n");
            goto err;
      }
      if (((image->id >> 24) & 0xF /* NPE ID */) != npe->id) {
            print_npe(KERN_ERR, npe, "firmware file NPE ID mismatch\n");
            goto err;
      }
      if (image->magic == swab32(FW_MAGIC))
            for (i = 0; i < image->size; i++)
                  image->data[i] = swab32(image->data[i]);

      if (!cpu_is_ixp46x() && ((image->id >> 28) & 0xF /* device ID */)) {
            print_npe(KERN_INFO, npe, "IXP46x firmware ignored on "
                    "IXP42x\n");
            goto err;
      }

      if (npe_running(npe)) {
            print_npe(KERN_INFO, npe, "unable to load firmware, NPE is "
                    "already running\n");
            err = -EBUSY;
            goto err;
      }
#if 0
      npe_stop(npe);
      npe_reset(npe);
#endif

      print_npe(KERN_INFO, npe, "firmware functionality 0x%X, "
              "revision 0x%X:%X\n", (image->id >> 16) & 0xFF,
              (image->id >> 8) & 0xFF, image->id & 0xFF);

      if (!cpu_is_ixp46x()) {
            if (!npe->id)
                  instr_size = NPE_A_42X_INSTR_SIZE;
            else
                  instr_size = NPE_B_AND_C_42X_INSTR_SIZE;
            data_size = NPE_42X_DATA_SIZE;
      } else {
            instr_size = NPE_46X_INSTR_SIZE;
            data_size = NPE_46X_DATA_SIZE;
      }

      for (blocks = 0; blocks * sizeof(struct dl_block) / 4 < image->size;
           blocks++)
            if (image->blocks[blocks].type == FW_BLOCK_TYPE_EOF)
                  break;
      if (blocks * sizeof(struct dl_block) / 4 >= image->size) {
            print_npe(KERN_INFO, npe, "firmware EOF block marker not "
                    "found\n");
            goto err;
      }

#if DEBUG_FW
      print_npe(KERN_DEBUG, npe, "%i firmware blocks found\n", blocks);
#endif

      table_end = blocks * sizeof(struct dl_block) / 4 + 1 /* EOF marker */;
      for (i = 0, blk = image->blocks; i < blocks; i++, blk++) {
            if (blk->offset > image->size - sizeof(struct dl_codeblock) / 4
                || blk->offset < table_end) {
                  print_npe(KERN_INFO, npe, "invalid offset 0x%X of "
                          "firmware block #%i\n", blk->offset, i);
                  goto err;
            }

            cb = (struct dl_codeblock*)&image->data[blk->offset];
            if (blk->type == FW_BLOCK_TYPE_INSTR) {
                  if (cb->npe_addr + cb->size > instr_size)
                        goto too_big;
                  cmd = CMD_WR_INS_MEM;
            } else if (blk->type == FW_BLOCK_TYPE_DATA) {
                  if (cb->npe_addr + cb->size > data_size)
                        goto too_big;
                  cmd = CMD_WR_DATA_MEM;
            } else {
                  print_npe(KERN_INFO, npe, "invalid firmware block #%i "
                          "type 0x%X\n", i, blk->type);
                  goto err;
            }
            if (blk->offset + sizeof(*cb) / 4 + cb->size > image->size) {
                  print_npe(KERN_INFO, npe, "firmware block #%i doesn't "
                          "fit in firmware image: type %c, start 0x%X,"
                          " length 0x%X\n", i,
                          blk->type == FW_BLOCK_TYPE_INSTR ? 'I' : 'D',
                          cb->npe_addr, cb->size);
                  goto err;
            }

            for (j = 0; j < cb->size; j++)
                  npe_cmd_write(npe, cb->npe_addr + j, cmd, cb->data[j]);
      }

      npe_start(npe);
      if (!npe_running(npe))
            print_npe(KERN_ERR, npe, "unable to start\n");
      release_firmware(fw_entry);
      return 0;

too_big:
      print_npe(KERN_INFO, npe, "firmware block #%i doesn't fit in NPE "
              "memory: type %c, start 0x%X, length 0x%X\n", i,
              blk->type == FW_BLOCK_TYPE_INSTR ? 'I' : 'D',
              cb->npe_addr, cb->size);
err:
      release_firmware(fw_entry);
      return err;
}


struct npe *npe_request(int id)
{
      if (id < NPE_COUNT)
            if (npe_tab[id].valid)
                  if (try_module_get(THIS_MODULE))
                        return &npe_tab[id];
      return NULL;
}

void npe_release(struct npe *npe)
{
      module_put(THIS_MODULE);
}


static int __init npe_init_module(void)
{

      int i, found = 0;

      for (i = 0; i < NPE_COUNT; i++) {
            struct npe *npe = &npe_tab[i];
            if (!(ixp4xx_read_feature_bits() &
                  (IXP4XX_FEATURE_RESET_NPEA << i)))
                  continue; /* NPE already disabled or not present */
            if (!(npe->mem_res = request_mem_region(npe->regs_phys,
                                          REGS_SIZE,
                                          npe_name(npe)))) {
                  print_npe(KERN_ERR, npe,
                          "failed to request memory region\n");
                  continue;
            }

            if (npe_reset(npe))
                  continue;
            npe->valid = 1;
            found++;
      }

      if (!found)
            return -ENOSYS;
      return 0;
}

static void __exit npe_cleanup_module(void)
{
      int i;

      for (i = 0; i < NPE_COUNT; i++)
            if (npe_tab[i].mem_res) {
                  npe_reset(&npe_tab[i]);
                  release_resource(npe_tab[i].mem_res);
            }
}

module_init(npe_init_module);
module_exit(npe_cleanup_module);

MODULE_AUTHOR("Krzysztof Halasa");
MODULE_LICENSE("GPL v2");

EXPORT_SYMBOL(npe_names);
EXPORT_SYMBOL(npe_running);
EXPORT_SYMBOL(npe_request);
EXPORT_SYMBOL(npe_release);
EXPORT_SYMBOL(npe_load_firmware);
EXPORT_SYMBOL(npe_send_message);
EXPORT_SYMBOL(npe_recv_message);
EXPORT_SYMBOL(npe_send_recv_message);

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