New driver "sfc" for Solarstorm SFC4000 controller.

The driver supports the 10Xpress PHY and XFP modules on our reference
designs SFE4001 and SFE4002 and the SMC models SMC10GPCIe-XFP and
SMC10GPCIe-10BT.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 252 insertions, 0 deletions

diff --git a/drivers/net/sfc/sfe4001.c b/drivers/net/sfc/sfe4001.c
new file mode 100644
index 000000000000..11fa9fb8f48b
--- /dev/null
+++ b/drivers/net/sfc/sfe4001.c
@@ -0,0 +1,252 @@
+/****************************************************************************
+ * Driver for Solarflare Solarstorm network controllers and boards
+ * Copyright 2007 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.
+ */
+
+/*****************************************************************************
+ * Support for the SFE4001 NIC: driver code for the PCA9539 I/O expander that
+ * controls the PHY power rails, and for the MAX6647 temp. sensor used to check
+ * the PHY
+ */
+#include <linux/delay.h>
+#include "efx.h"
+#include "phy.h"
+#include "boards.h"
+#include "falcon.h"
+#include "falcon_hwdefs.h"
+#include "mac.h"
+
+/**************************************************************************
+ *
+ * I2C IO Expander device
+ *
+ **************************************************************************/
+#define PCA9539 0x74
+
+#define P0_IN 0x00
+#define P0_OUT 0x02
+#define P0_INVERT 0x04
+#define P0_CONFIG 0x06
+
+#define P0_EN_1V0X_LBN 0
+#define P0_EN_1V0X_WIDTH 1
+#define P0_EN_1V2_LBN 1
+#define P0_EN_1V2_WIDTH 1
+#define P0_EN_2V5_LBN 2
+#define P0_EN_2V5_WIDTH 1
+#define P0_EN_3V3X_LBN 3
+#define P0_EN_3V3X_WIDTH 1
+#define P0_EN_5V_LBN 4
+#define P0_EN_5V_WIDTH 1
+#define P0_SHORTEN_JTAG_LBN 5
+#define P0_SHORTEN_JTAG_WIDTH 1
+#define P0_X_TRST_LBN 6
+#define P0_X_TRST_WIDTH 1
+#define P0_DSP_RESET_LBN 7
+#define P0_DSP_RESET_WIDTH 1
+
+#define P1_IN 0x01
+#define P1_OUT 0x03
+#define P1_INVERT 0x05
+#define P1_CONFIG 0x07
+
+#define P1_AFE_PWD_LBN 0
+#define P1_AFE_PWD_WIDTH 1
+#define P1_DSP_PWD25_LBN 1
+#define P1_DSP_PWD25_WIDTH 1
+#define P1_RESERVED_LBN 2
+#define P1_RESERVED_WIDTH 2
+#define P1_SPARE_LBN 4
+#define P1_SPARE_WIDTH 4
+
+
+/**************************************************************************
+ *
+ * Temperature Sensor
+ *
+ **************************************************************************/
+#define MAX6647 0x4e
+
+#define RLTS    0x00
+#define RLTE    0x01
+#define RSL     0x02
+#define RCL     0x03
+#define RCRA    0x04
+#define RLHN    0x05
+#define RLLI    0x06
+#define RRHI    0x07
+#define RRLS    0x08
+#define WCRW    0x0a
+#define WLHO    0x0b
+#define WRHA    0x0c
+#define WRLN    0x0e
+#define OSHT    0x0f
+#define REET    0x10
+#define RIET    0x11
+#define RWOE    0x19
+#define RWOI    0x20
+#define HYS     0x21
+#define QUEUE   0x22
+#define MFID    0xfe
+#define REVID   0xff
+
+/* Status bits */
+#define MAX6647_BUSY    (1 << 7)        /* ADC is converting */
+#define MAX6647_LHIGH   (1 << 6)        /* Local high temp. alarm */
+#define MAX6647_LLOW    (1 << 5)        /* Local low temp. alarm */
+#define MAX6647_RHIGH   (1 << 4)        /* Remote high temp. alarm */
+#define MAX6647_RLOW    (1 << 3)        /* Remote low temp. alarm */
+#define MAX6647_FAULT   (1 << 2)        /* DXN/DXP short/open circuit */
+#define MAX6647_EOT     (1 << 1)        /* Remote junction overtemp. */
+#define MAX6647_IOT     (1 << 0)        /* Local junction overtemp. */
+
+static const u8 xgphy_max_temperature = 90;
+
+void sfe4001_poweroff(struct efx_nic *efx)
+{
+        struct efx_i2c_interface *i2c = &efx->i2c;
+
+        u8 cfg, out, in;
+
+        EFX_INFO(efx, "%s\n", __func__);
+
+        /* Turn off all power rails */
+        out = 0xff;
+        (void) efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
+
+        /* Disable port 1 outputs on IO expander */
+        cfg = 0xff;
+        (void) efx_i2c_write(i2c, PCA9539, P1_CONFIG, &cfg, 1);
+
+        /* Disable port 0 outputs on IO expander */
+        cfg = 0xff;
+        (void) efx_i2c_write(i2c, PCA9539, P0_CONFIG, &cfg, 1);
+
+        /* Clear any over-temperature alert */
+        (void) efx_i2c_read(i2c, MAX6647, RSL, &in, 1);
+}
+
+/* This board uses an I2C expander to provider power to the PHY, which needs to
+ * be turned on before the PHY can be used.
+ * Context: Process context, rtnl lock held
+ */
+int sfe4001_poweron(struct efx_nic *efx)
+{
+        struct efx_i2c_interface *i2c = &efx->i2c;
+        unsigned int count;
+        int rc;
+        u8 out, in, cfg;
+        efx_dword_t reg;
+
+        /* 10Xpress has fixed-function LED pins, so there is no board-specific
+         * blink code. */
+        efx->board_info.blink = tenxpress_phy_blink;
+
+        /* Ensure that XGXS and XAUI SerDes are held in reset */
+        EFX_POPULATE_DWORD_7(reg, XX_PWRDNA_EN, 1,
+                             XX_PWRDNB_EN, 1,
+                             XX_RSTPLLAB_EN, 1,
+                             XX_RESETA_EN, 1,
+                             XX_RESETB_EN, 1,
+                             XX_RSTXGXSRX_EN, 1,
+                             XX_RSTXGXSTX_EN, 1);
+        falcon_xmac_writel(efx, &reg, XX_PWR_RST_REG_MAC);
+        udelay(10);
+
+        /* Set DSP over-temperature alert threshold */
+        EFX_INFO(efx, "DSP cut-out at %dC\n", xgphy_max_temperature);
+        rc = efx_i2c_write(i2c, MAX6647, WLHO,
+                           &xgphy_max_temperature, 1);
+        if (rc)
+                goto fail1;
+
+        /* Read it back and verify */
+        rc = efx_i2c_read(i2c, MAX6647, RLHN, &in, 1);
+        if (rc)
+                goto fail1;
+        if (in != xgphy_max_temperature) {
+                rc = -EFAULT;
+                goto fail1;
+        }
+
+        /* Clear any previous over-temperature alert */
+        rc = efx_i2c_read(i2c, MAX6647, RSL, &in, 1);
+        if (rc)
+                goto fail1;
+
+        /* Enable port 0 and port 1 outputs on IO expander */
+        cfg = 0x00;
+        rc = efx_i2c_write(i2c, PCA9539, P0_CONFIG, &cfg, 1);
+        if (rc)
+                goto fail1;
+        cfg = 0xff & ~(1 << P1_SPARE_LBN);
+        rc = efx_i2c_write(i2c, PCA9539, P1_CONFIG, &cfg, 1);
+        if (rc)
+                goto fail2;
+
+        /* Turn all power off then wait 1 sec. This ensures PHY is reset */
+        out = 0xff & ~((0 << P0_EN_1V2_LBN) | (0 << P0_EN_2V5_LBN) |
+                       (0 << P0_EN_3V3X_LBN) | (0 << P0_EN_5V_LBN) |
+                       (0 << P0_EN_1V0X_LBN));
+        rc = efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
+        if (rc)
+                goto fail3;
+
+        schedule_timeout_uninterruptible(HZ);
+        count = 0;
+        do {
+                /* Turn on 1.2V, 2.5V, 3.3V and 5V power rails */
+                out = 0xff & ~((1 << P0_EN_1V2_LBN) | (1 << P0_EN_2V5_LBN) |
+                               (1 << P0_EN_3V3X_LBN) | (1 << P0_EN_5V_LBN) |
+                               (1 << P0_X_TRST_LBN));
+
+                rc = efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
+                if (rc)
+                        goto fail3;
+                msleep(10);
+
+                /* Turn on 1V power rail */
+                out &= ~(1 << P0_EN_1V0X_LBN);
+                rc = efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
+                if (rc)
+                        goto fail3;
+
+                EFX_INFO(efx, "waiting for power (attempt %d)...\n", count);
+
+                schedule_timeout_uninterruptible(HZ);
+
+                /* Check DSP is powered */
+                rc = efx_i2c_read(i2c, PCA9539, P1_IN, &in, 1);
+                if (rc)
+                        goto fail3;
+                if (in & (1 << P1_AFE_PWD_LBN))
+                        goto done;
+
+        } while (++count < 20);
+
+        EFX_INFO(efx, "timed out waiting for power\n");
+        rc = -ETIMEDOUT;
+        goto fail3;
+
+done:
+        EFX_INFO(efx, "PHY is powered on\n");
+        return 0;
+
+fail3:
+        /* Turn off all power rails */
+        out = 0xff;
+        (void) efx_i2c_write(i2c, PCA9539, P0_OUT, &out, 1);
+        /* Disable port 1 outputs on IO expander */
+        out = 0xff;
+        (void) efx_i2c_write(i2c, PCA9539, P1_CONFIG, &out, 1);
+fail2:
+        /* Disable port 0 outputs on IO expander */
+        out = 0xff;
+        (void) efx_i2c_write(i2c, PCA9539, P0_CONFIG, &out, 1);
+fail1:
+        return rc;
+}