drivers/net/sfc/xfp_phy.c

   1 /****************************************************************************
   2  * Driver for Solarflare Solarstorm network controllers and boards
   3  * Copyright 2006-2008 Solarflare Communications Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published
   7  * by the Free Software Foundation, incorporated herein by reference.
   8  */
   9 /*
  10  * Driver for XFP optical PHYs (plus some support specific to the Quake 2032)
  11  * See www.amcc.com for details (search for qt2032)
  12  */
  13
  14 #include <linux/timer.h>
  15 #include <linux/delay.h>
  16 #include "efx.h"
  17 #include "gmii.h"
  18 #include "mdio_10g.h"
  19 #include "xenpack.h"
  20 #include "phy.h"
  21 #include "mac.h"
  22
  23 #define XFP_REQUIRED_DEVS (MDIO_MMDREG_DEVS0_PCS |      \
  24                            MDIO_MMDREG_DEVS0_PMAPMD |   \
  25                            MDIO_MMDREG_DEVS0_PHYXS)
  26
  27 /****************************************************************************/
  28 /* Quake-specific MDIO registers */
  29 #define MDIO_QUAKE_LED0_REG     (0xD006)
  30
  31 void xfp_set_led(struct efx_nic *p, int led, int mode)
  32 {
  33         int addr = MDIO_QUAKE_LED0_REG + led;
  34         mdio_clause45_write(p, p->mii.phy_id, MDIO_MMD_PMAPMD, addr,
  35                             mode);
  36 }
  37
  38 #define XFP_MAX_RESET_TIME 500
  39 #define XFP_RESET_WAIT 10
  40
  41 /* Reset the PHYXS MMD. This is documented (for the Quake PHY) as doing
  42  * a complete soft reset.
  43  */
  44 static int xfp_reset_phy(struct efx_nic *efx)
  45 {
  46         int rc;
  47
  48         rc = mdio_clause45_reset_mmd(efx, MDIO_MMD_PHYXS,
  49                                      XFP_MAX_RESET_TIME / XFP_RESET_WAIT,
  50                                      XFP_RESET_WAIT);
  51         if (rc < 0)
  52                 goto fail;
  53
  54         /* Wait 250ms for the PHY to complete bootup */
  55         msleep(250);
  56
  57         /* Check that all the MMDs we expect are present and responding. We
  58          * expect faults on some if the link is down, but not on the PHY XS */
  59         rc = mdio_clause45_check_mmds(efx, XFP_REQUIRED_DEVS,
  60                                       MDIO_MMDREG_DEVS0_PHYXS);
  61         if (rc < 0)
  62                 goto fail;
  63
  64         efx->board_info.init_leds(efx);
  65
  66         return rc;
  67
  68  fail:
  69         EFX_ERR(efx, "XFP: reset timed out!\n");
  70         return rc;
  71 }
  72
  73 static int xfp_phy_init(struct efx_nic *efx)
  74 {
  75         u32 devid = mdio_clause45_read_id(efx, MDIO_MMD_PHYXS);
  76         int rc;
  77
  78         EFX_INFO(efx, "XFP: PHY ID reg %x (OUI %x model %x revision"
  79                  " %x)\n", devid, MDIO_ID_OUI(devid), MDIO_ID_MODEL(devid),
  80                  MDIO_ID_REV(devid));
  81
  82         rc = xfp_reset_phy(efx);
  83
  84         EFX_INFO(efx, "XFP: PHY init %s.\n",
  85                  rc ? "failed" : "successful");
  86
  87         return rc;
  88 }
  89
  90 static void xfp_phy_clear_interrupt(struct efx_nic *efx)
  91 {
  92         xenpack_clear_lasi_irqs(efx);
  93 }
  94
  95 static int xfp_link_ok(struct efx_nic *efx)
  96 {
  97         return mdio_clause45_links_ok(efx, XFP_REQUIRED_DEVS);
  98 }
  99
 100 static int xfp_phy_check_hw(struct efx_nic *efx)
 101 {
 102         int rc = 0;
 103         int link_up = xfp_link_ok(efx);
 104         /* Simulate a PHY event if link state has changed */
 105         if (link_up != efx->link_up)
 106                 falcon_xmac_sim_phy_event(efx);
 107
 108         return rc;
 109 }
 110
 111 static void xfp_phy_reconfigure(struct efx_nic *efx)
 112 {
 113         efx->link_up = xfp_link_ok(efx);
 114         efx->link_options = GM_LPA_10000FULL;
 115 }
 116
 117
 118 static void xfp_phy_fini(struct efx_nic *efx)
 119 {
 120         /* Clobber the LED if it was blinking */
 121         efx->board_info.blink(efx, 0);
 122 }
 123
 124 struct efx_phy_operations falcon_xfp_phy_ops = {
 125         .init            = xfp_phy_init,
 126         .reconfigure     = xfp_phy_reconfigure,
 127         .check_hw        = xfp_phy_check_hw,
 128         .fini            = xfp_phy_fini,
 129         .clear_interrupt = xfp_phy_clear_interrupt,
 130         .reset_xaui      = efx_port_dummy_op_void,
 131         .mmds            = XFP_REQUIRED_DEVS,
 132 };