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 "mdio_10g.h"
  18 #include "xenpack.h"
  19 #include "phy.h"
  20 #include "falcon.h"
  21
  22 #define XFP_REQUIRED_DEVS (MDIO_MMDREG_DEVS_PCS |       \
  23                            MDIO_MMDREG_DEVS_PMAPMD |    \
  24                            MDIO_MMDREG_DEVS_PHYXS)
  25
  26 #define XFP_LOOPBACKS ((1 << LOOPBACK_PCS) |            \
  27                        (1 << LOOPBACK_PMAPMD) |         \
  28                        (1 << LOOPBACK_NETWORK))
  29
  30 /****************************************************************************/
  31 /* Quake-specific MDIO registers */
  32 #define MDIO_QUAKE_LED0_REG     (0xD006)
  33
  34 void xfp_set_led(struct efx_nic *p, int led, int mode)
  35 {
  36         int addr = MDIO_QUAKE_LED0_REG + led;
  37         mdio_clause45_write(p, p->mii.phy_id, MDIO_MMD_PMAPMD, addr,
  38                             mode);
  39 }
  40
  41 struct xfp_phy_data {
  42         enum efx_phy_mode phy_mode;
  43 };
  44
  45 #define XFP_MAX_RESET_TIME 500
  46 #define XFP_RESET_WAIT 10
  47
  48 /* Reset the PHYXS MMD. This is documented (for the Quake PHY) as doing
  49  * a complete soft reset.
  50  */
  51 static int xfp_reset_phy(struct efx_nic *efx)
  52 {
  53         int rc;
  54
  55         rc = mdio_clause45_reset_mmd(efx, MDIO_MMD_PHYXS,
  56                                      XFP_MAX_RESET_TIME / XFP_RESET_WAIT,
  57                                      XFP_RESET_WAIT);
  58         if (rc < 0)
  59                 goto fail;
  60
  61         /* Wait 250ms for the PHY to complete bootup */
  62         msleep(250);
  63
  64         /* Check that all the MMDs we expect are present and responding. We
  65          * expect faults on some if the link is down, but not on the PHY XS */
  66         rc = mdio_clause45_check_mmds(efx, XFP_REQUIRED_DEVS,
  67                                       MDIO_MMDREG_DEVS_PHYXS);
  68         if (rc < 0)
  69                 goto fail;
  70
  71         efx->board_info.init_leds(efx);
  72
  73         return rc;
  74
  75  fail:
  76         EFX_ERR(efx, "XFP: reset timed out!\n");
  77         return rc;
  78 }
  79
  80 static int xfp_phy_init(struct efx_nic *efx)
  81 {
  82         struct xfp_phy_data *phy_data;
  83         u32 devid = mdio_clause45_read_id(efx, MDIO_MMD_PHYXS);
  84         int rc;
  85
  86         phy_data = kzalloc(sizeof(struct xfp_phy_data), GFP_KERNEL);
  87         if (!phy_data)
  88                 return -ENOMEM;
  89         efx->phy_data = phy_data;
  90
  91         EFX_INFO(efx, "XFP: PHY ID reg %x (OUI %x model %x revision"
  92                  " %x)\n", devid, MDIO_ID_OUI(devid), MDIO_ID_MODEL(devid),
  93                  MDIO_ID_REV(devid));
  94
  95         phy_data->phy_mode = efx->phy_mode;
  96
  97         rc = xfp_reset_phy(efx);
  98
  99         EFX_INFO(efx, "XFP: PHY init %s.\n",
 100                  rc ? "failed" : "successful");
 101         if (rc < 0)
 102                 goto fail;
 103
 104         return 0;
 105
 106  fail:
 107         kfree(efx->phy_data);
 108         efx->phy_data = NULL;
 109         return rc;
 110 }
 111
 112 static void xfp_phy_clear_interrupt(struct efx_nic *efx)
 113 {
 114         xenpack_clear_lasi_irqs(efx);
 115 }
 116
 117 static int xfp_link_ok(struct efx_nic *efx)
 118 {
 119         return mdio_clause45_links_ok(efx, XFP_REQUIRED_DEVS);
 120 }
 121
 122 static int xfp_phy_check_hw(struct efx_nic *efx)
 123 {
 124         int rc = 0;
 125         int link_up = xfp_link_ok(efx);
 126         /* Simulate a PHY event if link state has changed */
 127         if (link_up != efx->link_up)
 128                 falcon_sim_phy_event(efx);
 129
 130         rc = efx->board_info.monitor(efx);
 131         if (rc) {
 132                 struct xfp_phy_data *phy_data = efx->phy_data;
 133                 EFX_ERR(efx, "XFP sensor alert; putting PHY into low power\n");
 134                 efx->phy_mode |= PHY_MODE_LOW_POWER;
 135                 mdio_clause45_set_mmds_lpower(efx, 1, XFP_REQUIRED_DEVS);
 136                 phy_data->phy_mode |= PHY_MODE_LOW_POWER;
 137         }
 138
 139         return rc;
 140 }
 141
 142 static void xfp_phy_reconfigure(struct efx_nic *efx)
 143 {
 144         struct xfp_phy_data *phy_data = efx->phy_data;
 145
 146         /* Reset the PHY when moving from tx off to tx on */
 147         if (!(efx->phy_mode & PHY_MODE_TX_DISABLED) &&
 148             (phy_data->phy_mode & PHY_MODE_TX_DISABLED))
 149                 xfp_reset_phy(efx);
 150
 151         mdio_clause45_transmit_disable(efx);
 152         mdio_clause45_phy_reconfigure(efx);
 153
 154         phy_data->phy_mode = efx->phy_mode;
 155         efx->link_up = xfp_link_ok(efx);
 156         efx->link_speed = 10000;
 157         efx->link_fd = true;
 158 }
 159
 160
 161 static void xfp_phy_fini(struct efx_nic *efx)
 162 {
 163         /* Clobber the LED if it was blinking */
 164         efx->board_info.blink(efx, false);
 165
 166         /* Free the context block */
 167         kfree(efx->phy_data);
 168         efx->phy_data = NULL;
 169 }
 170
 171 struct efx_phy_operations falcon_xfp_phy_ops = {
 172         .macs            = EFX_XMAC,
 173         .init            = xfp_phy_init,
 174         .reconfigure     = xfp_phy_reconfigure,
 175         .check_hw        = xfp_phy_check_hw,
 176         .fini            = xfp_phy_fini,
 177         .clear_interrupt = xfp_phy_clear_interrupt,
 178         .get_settings    = mdio_clause45_get_settings,
 179         .set_settings    = mdio_clause45_set_settings,
 180         .mmds            = XFP_REQUIRED_DEVS,
 181         .loopbacks       = XFP_LOOPBACKS,
 182 };