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 #define XFP_LOOPBACKS ((1 << LOOPBACK_PCS) |            \
  28                        (1 << LOOPBACK_PMAPMD) |         \
  29                        (1 << LOOPBACK_NETWORK))
  30
  31 /****************************************************************************/
  32 /* Quake-specific MDIO registers */
  33 #define MDIO_QUAKE_LED0_REG     (0xD006)
  34
  35 void xfp_set_led(struct efx_nic *p, int led, int mode)
  36 {
  37         int addr = MDIO_QUAKE_LED0_REG + led;
  38         mdio_clause45_write(p, p->mii.phy_id, MDIO_MMD_PMAPMD, addr,
  39                             mode);
  40 }
  41
  42 struct xfp_phy_data {
  43         int tx_disabled;
  44 };
  45
  46 #define XFP_MAX_RESET_TIME 500
  47 #define XFP_RESET_WAIT 10
  48
  49 /* Reset the PHYXS MMD. This is documented (for the Quake PHY) as doing
  50  * a complete soft reset.
  51  */
  52 static int xfp_reset_phy(struct efx_nic *efx)
  53 {
  54         int rc;
  55
  56         rc = mdio_clause45_reset_mmd(efx, MDIO_MMD_PHYXS,
  57                                      XFP_MAX_RESET_TIME / XFP_RESET_WAIT,
  58                                      XFP_RESET_WAIT);
  59         if (rc < 0)
  60                 goto fail;
  61
  62         /* Wait 250ms for the PHY to complete bootup */
  63         msleep(250);
  64
  65         /* Check that all the MMDs we expect are present and responding. We
  66          * expect faults on some if the link is down, but not on the PHY XS */
  67         rc = mdio_clause45_check_mmds(efx, XFP_REQUIRED_DEVS,
  68                                       MDIO_MMDREG_DEVS0_PHYXS);
  69         if (rc < 0)
  70                 goto fail;
  71
  72         efx->board_info.init_leds(efx);
  73
  74         return rc;
  75
  76  fail:
  77         EFX_ERR(efx, "XFP: reset timed out!\n");
  78         return rc;
  79 }
  80
  81 static int xfp_phy_init(struct efx_nic *efx)
  82 {
  83         struct xfp_phy_data *phy_data;
  84         u32 devid = mdio_clause45_read_id(efx, MDIO_MMD_PHYXS);
  85         int rc;
  86
  87         phy_data = kzalloc(sizeof(struct xfp_phy_data), GFP_KERNEL);
  88         if (!phy_data)
  89                 return -ENOMEM;
  90         efx->phy_data = phy_data;
  91
  92         EFX_INFO(efx, "XFP: PHY ID reg %x (OUI %x model %x revision"
  93                  " %x)\n", devid, MDIO_ID_OUI(devid), MDIO_ID_MODEL(devid),
  94                  MDIO_ID_REV(devid));
  95
  96         phy_data->tx_disabled = efx->tx_disabled;
  97
  98         rc = xfp_reset_phy(efx);
  99
 100         EFX_INFO(efx, "XFP: PHY init %s.\n",
 101                  rc ? "failed" : "successful");
 102         if (rc < 0)
 103                 goto fail;
 104
 105         return 0;
 106
 107  fail:
 108         kfree(efx->phy_data);
 109         efx->phy_data = NULL;
 110         return rc;
 111 }
 112
 113 static void xfp_phy_clear_interrupt(struct efx_nic *efx)
 114 {
 115         xenpack_clear_lasi_irqs(efx);
 116 }
 117
 118 static int xfp_link_ok(struct efx_nic *efx)
 119 {
 120         return mdio_clause45_links_ok(efx, XFP_REQUIRED_DEVS);
 121 }
 122
 123 static int xfp_phy_check_hw(struct efx_nic *efx)
 124 {
 125         int rc = 0;
 126         int link_up = xfp_link_ok(efx);
 127         /* Simulate a PHY event if link state has changed */
 128         if (link_up != efx->link_up)
 129                 falcon_xmac_sim_phy_event(efx);
 130
 131         return rc;
 132 }
 133
 134 static void xfp_phy_reconfigure(struct efx_nic *efx)
 135 {
 136         struct xfp_phy_data *phy_data = efx->phy_data;
 137
 138         /* Reset the PHY when moving from tx off to tx on */
 139         if (phy_data->tx_disabled && !efx->tx_disabled)
 140                 xfp_reset_phy(efx);
 141
 142         mdio_clause45_transmit_disable(efx);
 143         mdio_clause45_phy_reconfigure(efx);
 144
 145         phy_data->tx_disabled = efx->tx_disabled;
 146         efx->link_up = xfp_link_ok(efx);
 147         efx->link_options = GM_LPA_10000FULL;
 148 }
 149
 150
 151 static void xfp_phy_fini(struct efx_nic *efx)
 152 {
 153         /* Clobber the LED if it was blinking */
 154         efx->board_info.blink(efx, 0);
 155
 156         /* Free the context block */
 157         kfree(efx->phy_data);
 158         efx->phy_data = NULL;
 159 }
 160
 161 struct efx_phy_operations falcon_xfp_phy_ops = {
 162         .init            = xfp_phy_init,
 163         .reconfigure     = xfp_phy_reconfigure,
 164         .check_hw        = xfp_phy_check_hw,
 165         .fini            = xfp_phy_fini,
 166         .clear_interrupt = xfp_phy_clear_interrupt,
 167         .reset_xaui      = efx_port_dummy_op_void,
 168         .mmds            = XFP_REQUIRED_DEVS,
 169         .loopbacks       = XFP_LOOPBACKS,
 170 };