sfc: separate out SFC4000 ("Falcon") support into new sfc-falcon driver

Rationale: The differences between Falcon and Siena are in many ways larger
 than those between Siena and EF10 (despite Siena being nominally "Falcon-
 architecture"); for instance, Falcon has no MCPU, so there is no MCDI.
 Removing Falcon support from the sfc driver should simplify the latter,
 and avoid the possibility of Falcon support being broken by changes to sfc
 (which are rarely if ever tested on Falcon, it being end-of-lifed hardware).

The sfc-falcon driver created in this changeset is essentially a copy of the
 sfc driver, but with Siena- and EF10-specific code, including MCDI, removed
 and with the "efx_" identifier prefix changed to "ef4_" (for "EFX 4000-
 series") to avoid collisions when both drivers are built-in.

This changeset removes Falcon from the sfc driver's PCI ID table; then in
 sfc I've removed obvious Falcon-related code: I removed the Falcon NIC
 functions, Falcon PHY code, and EFX_REV_FALCON_*, then fixed up everything
 that referenced them.

Also, increment minor version of both drivers (to 4.1).

For now, CONFIG_SFC selects CONFIG_SFC_FALCON, so that updating old configs
 doesn't cause Falcon support to disappear; but that should be undone at
 some point in the future.

Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 494 insertions, 0 deletions

diff --git a/drivers/net/ethernet/sfc/falcon/tenxpress.c b/drivers/net/ethernet/sfc/falcon/tenxpress.c
new file mode 100644
index 000000000000..acc548a1c4d6
--- /dev/null
+++ b/drivers/net/ethernet/sfc/falcon/tenxpress.c
@@ -0,0 +1,494 @@
+/****************************************************************************
+ * Driver for Solarflare network controllers and boards
+ * Copyright 2007-2011 Solarflare Communications Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation, incorporated herein by reference.
+ */
+
+#include <linux/delay.h>
+#include <linux/rtnetlink.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include "efx.h"
+#include "mdio_10g.h"
+#include "nic.h"
+#include "phy.h"
+#include "workarounds.h"
+
+/* We expect these MMDs to be in the package. */
+#define TENXPRESS_REQUIRED_DEVS (MDIO_DEVS_PMAPMD	| \
+				 MDIO_DEVS_PCS		| \
+				 MDIO_DEVS_PHYXS	| \
+				 MDIO_DEVS_AN)
+
+#define SFX7101_LOOPBACKS ((1 << LOOPBACK_PHYXS) |	\
+			   (1 << LOOPBACK_PCS) |	\
+			   (1 << LOOPBACK_PMAPMD) |	\
+			   (1 << LOOPBACK_PHYXS_WS))
+
+/* We complain if we fail to see the link partner as 10G capable this many
+ * times in a row (must be > 1 as sampling the autoneg. registers is racy)
+ */
+#define MAX_BAD_LP_TRIES	(5)
+
+/* Extended control register */
+#define PMA_PMD_XCONTROL_REG	49152
+#define PMA_PMD_EXT_GMII_EN_LBN	1
+#define PMA_PMD_EXT_GMII_EN_WIDTH 1
+#define PMA_PMD_EXT_CLK_OUT_LBN	2
+#define PMA_PMD_EXT_CLK_OUT_WIDTH 1
+#define PMA_PMD_LNPGA_POWERDOWN_LBN 8
+#define PMA_PMD_LNPGA_POWERDOWN_WIDTH 1
+#define PMA_PMD_EXT_CLK312_WIDTH 1
+#define PMA_PMD_EXT_LPOWER_LBN  12
+#define PMA_PMD_EXT_LPOWER_WIDTH 1
+#define PMA_PMD_EXT_ROBUST_LBN	14
+#define PMA_PMD_EXT_ROBUST_WIDTH 1
+#define PMA_PMD_EXT_SSR_LBN	15
+#define PMA_PMD_EXT_SSR_WIDTH	1
+
+/* extended status register */
+#define PMA_PMD_XSTATUS_REG	49153
+#define PMA_PMD_XSTAT_MDIX_LBN	14
+#define PMA_PMD_XSTAT_FLP_LBN   (12)
+
+/* LED control register */
+#define PMA_PMD_LED_CTRL_REG	49159
+#define PMA_PMA_LED_ACTIVITY_LBN	(3)
+
+/* LED function override register */
+#define PMA_PMD_LED_OVERR_REG	49161
+/* Bit positions for different LEDs (there are more but not wired on SFE4001)*/
+#define PMA_PMD_LED_LINK_LBN	(0)
+#define PMA_PMD_LED_SPEED_LBN	(2)
+#define PMA_PMD_LED_TX_LBN	(4)
+#define PMA_PMD_LED_RX_LBN	(6)
+/* Override settings */
+#define	PMA_PMD_LED_AUTO	(0)	/* H/W control */
+#define	PMA_PMD_LED_ON		(1)
+#define	PMA_PMD_LED_OFF		(2)
+#define PMA_PMD_LED_FLASH	(3)
+#define PMA_PMD_LED_MASK	3
+/* All LEDs under hardware control */
+/* Green and Amber under hardware control, Red off */
+#define SFX7101_PMA_PMD_LED_DEFAULT (PMA_PMD_LED_OFF << PMA_PMD_LED_RX_LBN)
+
+#define PMA_PMD_SPEED_ENABLE_REG 49192
+#define PMA_PMD_100TX_ADV_LBN    1
+#define PMA_PMD_100TX_ADV_WIDTH  1
+#define PMA_PMD_1000T_ADV_LBN    2
+#define PMA_PMD_1000T_ADV_WIDTH  1
+#define PMA_PMD_10000T_ADV_LBN   3
+#define PMA_PMD_10000T_ADV_WIDTH 1
+#define PMA_PMD_SPEED_LBN        4
+#define PMA_PMD_SPEED_WIDTH      4
+
+/* Misc register defines */
+#define PCS_CLOCK_CTRL_REG	55297
+#define PLL312_RST_N_LBN 2
+
+#define PCS_SOFT_RST2_REG	55302
+#define SERDES_RST_N_LBN 13
+#define XGXS_RST_N_LBN 12
+
+#define	PCS_TEST_SELECT_REG	55303	/* PRM 10.5.8 */
+#define	CLK312_EN_LBN 3
+
+/* PHYXS registers */
+#define PHYXS_XCONTROL_REG	49152
+#define PHYXS_RESET_LBN		15
+#define PHYXS_RESET_WIDTH	1
+
+#define PHYXS_TEST1         (49162)
+#define LOOPBACK_NEAR_LBN   (8)
+#define LOOPBACK_NEAR_WIDTH (1)
+
+/* Boot status register */
+#define PCS_BOOT_STATUS_REG		53248
+#define PCS_BOOT_FATAL_ERROR_LBN	0
+#define PCS_BOOT_PROGRESS_LBN		1
+#define PCS_BOOT_PROGRESS_WIDTH		2
+#define PCS_BOOT_PROGRESS_INIT		0
+#define PCS_BOOT_PROGRESS_WAIT_MDIO	1
+#define PCS_BOOT_PROGRESS_CHECKSUM	2
+#define PCS_BOOT_PROGRESS_JUMP		3
+#define PCS_BOOT_DOWNLOAD_WAIT_LBN	3
+#define PCS_BOOT_CODE_STARTED_LBN	4
+
+/* 100M/1G PHY registers */
+#define GPHY_XCONTROL_REG	49152
+#define GPHY_ISOLATE_LBN	10
+#define GPHY_ISOLATE_WIDTH	1
+#define GPHY_DUPLEX_LBN		8
+#define GPHY_DUPLEX_WIDTH	1
+#define GPHY_LOOPBACK_NEAR_LBN	14
+#define GPHY_LOOPBACK_NEAR_WIDTH 1
+
+#define C22EXT_STATUS_REG       49153
+#define C22EXT_STATUS_LINK_LBN  2
+#define C22EXT_STATUS_LINK_WIDTH 1
+
+#define C22EXT_MSTSLV_CTRL			49161
+#define C22EXT_MSTSLV_CTRL_ADV_1000_HD_LBN	8
+#define C22EXT_MSTSLV_CTRL_ADV_1000_FD_LBN	9
+
+#define C22EXT_MSTSLV_STATUS			49162
+#define C22EXT_MSTSLV_STATUS_LP_1000_HD_LBN	10
+#define C22EXT_MSTSLV_STATUS_LP_1000_FD_LBN	11
+
+/* Time to wait between powering down the LNPGA and turning off the power
+ * rails */
+#define LNPGA_PDOWN_WAIT	(HZ / 5)
+
+struct tenxpress_phy_data {
+	enum ef4_loopback_mode loopback_mode;
+	enum ef4_phy_mode phy_mode;
+	int bad_lp_tries;
+};
+
+static int tenxpress_init(struct ef4_nic *efx)
+{
+	/* Enable 312.5 MHz clock */
+	ef4_mdio_write(efx, MDIO_MMD_PCS, PCS_TEST_SELECT_REG,
+		       1 << CLK312_EN_LBN);
+
+	/* Set the LEDs up as: Green = Link, Amber = Link/Act, Red = Off */
+	ef4_mdio_set_flag(efx, MDIO_MMD_PMAPMD, PMA_PMD_LED_CTRL_REG,
+			  1 << PMA_PMA_LED_ACTIVITY_LBN, true);
+	ef4_mdio_write(efx, MDIO_MMD_PMAPMD, PMA_PMD_LED_OVERR_REG,
+		       SFX7101_PMA_PMD_LED_DEFAULT);
+
+	return 0;
+}
+
+static int tenxpress_phy_probe(struct ef4_nic *efx)
+{
+	struct tenxpress_phy_data *phy_data;
+
+	/* Allocate phy private storage */
+	phy_data = kzalloc(sizeof(*phy_data), GFP_KERNEL);
+	if (!phy_data)
+		return -ENOMEM;
+	efx->phy_data = phy_data;
+	phy_data->phy_mode = efx->phy_mode;
+
+	efx->mdio.mmds = TENXPRESS_REQUIRED_DEVS;
+	efx->mdio.mode_support = MDIO_SUPPORTS_C45;
+
+	efx->loopback_modes = SFX7101_LOOPBACKS | FALCON_XMAC_LOOPBACKS;
+
+	efx->link_advertising = (ADVERTISED_TP | ADVERTISED_Autoneg |
+				 ADVERTISED_10000baseT_Full);
+
+	return 0;
+}
+
+static int tenxpress_phy_init(struct ef4_nic *efx)
+{
+	int rc;
+
+	falcon_board(efx)->type->init_phy(efx);
+
+	if (!(efx->phy_mode & PHY_MODE_SPECIAL)) {
+		rc = ef4_mdio_wait_reset_mmds(efx, TENXPRESS_REQUIRED_DEVS);
+		if (rc < 0)
+			return rc;
+
+		rc = ef4_mdio_check_mmds(efx, TENXPRESS_REQUIRED_DEVS);
+		if (rc < 0)
+			return rc;
+	}
+
+	rc = tenxpress_init(efx);
+	if (rc < 0)
+		return rc;
+
+	/* Reinitialise flow control settings */
+	ef4_link_set_wanted_fc(efx, efx->wanted_fc);
+	ef4_mdio_an_reconfigure(efx);
+
+	schedule_timeout_uninterruptible(HZ / 5); /* 200ms */
+
+	/* Let XGXS and SerDes out of reset */
+	falcon_reset_xaui(efx);
+
+	return 0;
+}
+
+/* Perform a "special software reset" on the PHY. The caller is
+ * responsible for saving and restoring the PHY hardware registers
+ * properly, and masking/unmasking LASI */
+static int tenxpress_special_reset(struct ef4_nic *efx)
+{
+	int rc, reg;
+
+	/* The XGMAC clock is driven from the SFX7101 312MHz clock, so
+	 * a special software reset can glitch the XGMAC sufficiently for stats
+	 * requests to fail. */
+	falcon_stop_nic_stats(efx);
+
+	/* Initiate reset */
+	reg = ef4_mdio_read(efx, MDIO_MMD_PMAPMD, PMA_PMD_XCONTROL_REG);
+	reg |= (1 << PMA_PMD_EXT_SSR_LBN);
+	ef4_mdio_write(efx, MDIO_MMD_PMAPMD, PMA_PMD_XCONTROL_REG, reg);
+
+	mdelay(200);
+
+	/* Wait for the blocks to come out of reset */
+	rc = ef4_mdio_wait_reset_mmds(efx, TENXPRESS_REQUIRED_DEVS);
+	if (rc < 0)
+		goto out;
+
+	/* Try and reconfigure the device */
+	rc = tenxpress_init(efx);
+	if (rc < 0)
+		goto out;
+
+	/* Wait for the XGXS state machine to churn */
+	mdelay(10);
+out:
+	falcon_start_nic_stats(efx);
+	return rc;
+}
+
+static void sfx7101_check_bad_lp(struct ef4_nic *efx, bool link_ok)
+{
+	struct tenxpress_phy_data *pd = efx->phy_data;
+	bool bad_lp;
+	int reg;
+
+	if (link_ok) {
+		bad_lp = false;
+	} else {
+		/* Check that AN has started but not completed. */
+		reg = ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_STAT1);
+		if (!(reg & MDIO_AN_STAT1_LPABLE))
+			return; /* LP status is unknown */
+		bad_lp = !(reg & MDIO_AN_STAT1_COMPLETE);
+		if (bad_lp)
+			pd->bad_lp_tries++;
+	}
+
+	/* Nothing to do if all is well and was previously so. */
+	if (!pd->bad_lp_tries)
+		return;
+
+	/* Use the RX (red) LED as an error indicator once we've seen AN
+	 * failure several times in a row, and also log a message. */
+	if (!bad_lp || pd->bad_lp_tries == MAX_BAD_LP_TRIES) {
+		reg = ef4_mdio_read(efx, MDIO_MMD_PMAPMD,
+				    PMA_PMD_LED_OVERR_REG);
+		reg &= ~(PMA_PMD_LED_MASK << PMA_PMD_LED_RX_LBN);
+		if (!bad_lp) {
+			reg |= PMA_PMD_LED_OFF << PMA_PMD_LED_RX_LBN;
+		} else {
+			reg |= PMA_PMD_LED_FLASH << PMA_PMD_LED_RX_LBN;
+			netif_err(efx, link, efx->net_dev,
+				  "appears to be plugged into a port"
+				  " that is not 10GBASE-T capable. The PHY"
+				  " supports 10GBASE-T ONLY, so no link can"
+				  " be established\n");
+		}
+		ef4_mdio_write(efx, MDIO_MMD_PMAPMD,
+			       PMA_PMD_LED_OVERR_REG, reg);
+		pd->bad_lp_tries = bad_lp;
+	}
+}
+
+static bool sfx7101_link_ok(struct ef4_nic *efx)
+{
+	return ef4_mdio_links_ok(efx,
+				 MDIO_DEVS_PMAPMD |
+				 MDIO_DEVS_PCS |
+				 MDIO_DEVS_PHYXS);
+}
+
+static void tenxpress_ext_loopback(struct ef4_nic *efx)
+{
+	ef4_mdio_set_flag(efx, MDIO_MMD_PHYXS, PHYXS_TEST1,
+			  1 << LOOPBACK_NEAR_LBN,
+			  efx->loopback_mode == LOOPBACK_PHYXS);
+}
+
+static void tenxpress_low_power(struct ef4_nic *efx)
+{
+	ef4_mdio_set_mmds_lpower(
+		efx, !!(efx->phy_mode & PHY_MODE_LOW_POWER),
+		TENXPRESS_REQUIRED_DEVS);
+}
+
+static int tenxpress_phy_reconfigure(struct ef4_nic *efx)
+{
+	struct tenxpress_phy_data *phy_data = efx->phy_data;
+	bool phy_mode_change, loop_reset;
+
+	if (efx->phy_mode & (PHY_MODE_OFF | PHY_MODE_SPECIAL)) {
+		phy_data->phy_mode = efx->phy_mode;
+		return 0;
+	}
+
+	phy_mode_change = (efx->phy_mode == PHY_MODE_NORMAL &&
+			   phy_data->phy_mode != PHY_MODE_NORMAL);
+	loop_reset = (LOOPBACK_OUT_OF(phy_data, efx, LOOPBACKS_EXTERNAL(efx)) ||
+		      LOOPBACK_CHANGED(phy_data, efx, 1 << LOOPBACK_GPHY));
+
+	if (loop_reset || phy_mode_change) {
+		tenxpress_special_reset(efx);
+		falcon_reset_xaui(efx);
+	}
+
+	tenxpress_low_power(efx);
+	ef4_mdio_transmit_disable(efx);
+	ef4_mdio_phy_reconfigure(efx);
+	tenxpress_ext_loopback(efx);
+	ef4_mdio_an_reconfigure(efx);
+
+	phy_data->loopback_mode = efx->loopback_mode;
+	phy_data->phy_mode = efx->phy_mode;
+
+	return 0;
+}
+
+static void
+tenxpress_get_settings(struct ef4_nic *efx, struct ethtool_cmd *ecmd);
+
+/* Poll for link state changes */
+static bool tenxpress_phy_poll(struct ef4_nic *efx)
+{
+	struct ef4_link_state old_state = efx->link_state;
+
+	efx->link_state.up = sfx7101_link_ok(efx);
+	efx->link_state.speed = 10000;
+	efx->link_state.fd = true;
+	efx->link_state.fc = ef4_mdio_get_pause(efx);
+
+	sfx7101_check_bad_lp(efx, efx->link_state.up);
+
+	return !ef4_link_state_equal(&efx->link_state, &old_state);
+}
+
+static void sfx7101_phy_fini(struct ef4_nic *efx)
+{
+	int reg;
+
+	/* Power down the LNPGA */
+	reg = (1 << PMA_PMD_LNPGA_POWERDOWN_LBN);
+	ef4_mdio_write(efx, MDIO_MMD_PMAPMD, PMA_PMD_XCONTROL_REG, reg);
+
+	/* Waiting here ensures that the board fini, which can turn
+	 * off the power to the PHY, won't get run until the LNPGA
+	 * powerdown has been given long enough to complete. */
+	schedule_timeout_uninterruptible(LNPGA_PDOWN_WAIT); /* 200 ms */
+}
+
+static void tenxpress_phy_remove(struct ef4_nic *efx)
+{
+	kfree(efx->phy_data);
+	efx->phy_data = NULL;
+}
+
+
+/* Override the RX, TX and link LEDs */
+void tenxpress_set_id_led(struct ef4_nic *efx, enum ef4_led_mode mode)
+{
+	int reg;
+
+	switch (mode) {
+	case EF4_LED_OFF:
+		reg = (PMA_PMD_LED_OFF << PMA_PMD_LED_TX_LBN) |
+			(PMA_PMD_LED_OFF << PMA_PMD_LED_RX_LBN) |
+			(PMA_PMD_LED_OFF << PMA_PMD_LED_LINK_LBN);
+		break;
+	case EF4_LED_ON:
+		reg = (PMA_PMD_LED_ON << PMA_PMD_LED_TX_LBN) |
+			(PMA_PMD_LED_ON << PMA_PMD_LED_RX_LBN) |
+			(PMA_PMD_LED_ON << PMA_PMD_LED_LINK_LBN);
+		break;
+	default:
+		reg = SFX7101_PMA_PMD_LED_DEFAULT;
+		break;
+	}
+
+	ef4_mdio_write(efx, MDIO_MMD_PMAPMD, PMA_PMD_LED_OVERR_REG, reg);
+}
+
+static const char *const sfx7101_test_names[] = {
+	"bist"
+};
+
+static const char *sfx7101_test_name(struct ef4_nic *efx, unsigned int index)
+{
+	if (index < ARRAY_SIZE(sfx7101_test_names))
+		return sfx7101_test_names[index];
+	return NULL;
+}
+
+static int
+sfx7101_run_tests(struct ef4_nic *efx, int *results, unsigned flags)
+{
+	int rc;
+
+	if (!(flags & ETH_TEST_FL_OFFLINE))
+		return 0;
+
+	/* BIST is automatically run after a special software reset */
+	rc = tenxpress_special_reset(efx);
+	results[0] = rc ? -1 : 1;
+
+	ef4_mdio_an_reconfigure(efx);
+
+	return rc;
+}
+
+static void
+tenxpress_get_settings(struct ef4_nic *efx, struct ethtool_cmd *ecmd)
+{
+	u32 adv = 0, lpa = 0;
+	int reg;
+
+	reg = ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL);
+	if (reg & MDIO_AN_10GBT_CTRL_ADV10G)
+		adv |= ADVERTISED_10000baseT_Full;
+	reg = ef4_mdio_read(efx, MDIO_MMD_AN, MDIO_AN_10GBT_STAT);
+	if (reg & MDIO_AN_10GBT_STAT_LP10G)
+		lpa |= ADVERTISED_10000baseT_Full;
+
+	mdio45_ethtool_gset_npage(&efx->mdio, ecmd, adv, lpa);
+
+	/* In loopback, the PHY automatically brings up the correct interface,
+	 * but doesn't advertise the correct speed. So override it */
+	if (LOOPBACK_EXTERNAL(efx))
+		ethtool_cmd_speed_set(ecmd, SPEED_10000);
+}
+
+static int tenxpress_set_settings(struct ef4_nic *efx, struct ethtool_cmd *ecmd)
+{
+	if (!ecmd->autoneg)
+		return -EINVAL;
+
+	return ef4_mdio_set_settings(efx, ecmd);
+}
+
+static void sfx7101_set_npage_adv(struct ef4_nic *efx, u32 advertising)
+{
+	ef4_mdio_set_flag(efx, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL,
+			  MDIO_AN_10GBT_CTRL_ADV10G,
+			  advertising & ADVERTISED_10000baseT_Full);
+}
+
+const struct ef4_phy_operations falcon_sfx7101_phy_ops = {
+	.probe		  = tenxpress_phy_probe,
+	.init             = tenxpress_phy_init,
+	.reconfigure      = tenxpress_phy_reconfigure,
+	.poll             = tenxpress_phy_poll,
+	.fini             = sfx7101_phy_fini,
+	.remove		  = tenxpress_phy_remove,
+	.get_settings	  = tenxpress_get_settings,
+	.set_settings	  = tenxpress_set_settings,
+	.set_npage_adv    = sfx7101_set_npage_adv,
+	.test_alive	  = ef4_mdio_test_alive,
+	.test_name	  = sfx7101_test_name,
+	.run_tests	  = sfx7101_run_tests,
+};