igc: Add HW initialization code

Add code for hardware initialization and reset
Add code for semaphore handling

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 315 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc_mac.c b/drivers/net/ethernet/intel/igc/igc_mac.c
index 9976943df51c..90a98ee14550 100644
--- a/drivers/net/ethernet/intel/igc/igc_mac.c
+++ b/drivers/net/ethernet/intel/igc/igc_mac.c
@@ -2,4 +2,319 @@
 /* Copyright (c)  2018 Intel Corporation */
 
 #include <linux/pci.h>
+#include <linux/delay.h>
+
+#include "igc_mac.h"
 #include "igc_hw.h"
+
+/* forward declaration */
+static s32 igc_set_default_fc(struct igc_hw *hw);
+static s32 igc_set_fc_watermarks(struct igc_hw *hw);
+
+/**
+ * igc_disable_pcie_master - Disables PCI-express master access
+ * @hw: pointer to the HW structure
+ *
+ * Returns 0 (0) if successful, else returns -10
+ * (-IGC_ERR_MASTER_REQUESTS_PENDING) if master disable bit has not caused
+ * the master requests to be disabled.
+ *
+ * Disables PCI-Express master access and verifies there are no pending
+ * requests.
+ */
+s32 igc_disable_pcie_master(struct igc_hw *hw)
+{
+	s32 timeout = MASTER_DISABLE_TIMEOUT;
+	s32 ret_val = 0;
+	u32 ctrl;
+
+	ctrl = rd32(IGC_CTRL);
+	ctrl |= IGC_CTRL_GIO_MASTER_DISABLE;
+	wr32(IGC_CTRL, ctrl);
+
+	while (timeout) {
+		if (!(rd32(IGC_STATUS) &
+		    IGC_STATUS_GIO_MASTER_ENABLE))
+			break;
+		usleep_range(2000, 3000);
+		timeout--;
+	}
+
+	if (!timeout) {
+		hw_dbg("Master requests are pending.\n");
+		ret_val = -IGC_ERR_MASTER_REQUESTS_PENDING;
+		goto out;
+	}
+
+out:
+	return ret_val;
+}
+
+/**
+ * igc_init_rx_addrs - Initialize receive addresses
+ * @hw: pointer to the HW structure
+ * @rar_count: receive address registers
+ *
+ * Setup the receive address registers by setting the base receive address
+ * register to the devices MAC address and clearing all the other receive
+ * address registers to 0.
+ */
+void igc_init_rx_addrs(struct igc_hw *hw, u16 rar_count)
+{
+	u8 mac_addr[ETH_ALEN] = {0};
+	u32 i;
+
+	/* Setup the receive address */
+	hw_dbg("Programming MAC Address into RAR[0]\n");
+
+	hw->mac.ops.rar_set(hw, hw->mac.addr, 0);
+
+	/* Zero out the other (rar_entry_count - 1) receive addresses */
+	hw_dbg("Clearing RAR[1-%u]\n", rar_count - 1);
+	for (i = 1; i < rar_count; i++)
+		hw->mac.ops.rar_set(hw, mac_addr, i);
+}
+
+/**
+ * igc_setup_link - Setup flow control and link settings
+ * @hw: pointer to the HW structure
+ *
+ * Determines which flow control settings to use, then configures flow
+ * control.  Calls the appropriate media-specific link configuration
+ * function.  Assuming the adapter has a valid link partner, a valid link
+ * should be established.  Assumes the hardware has previously been reset
+ * and the transmitter and receiver are not enabled.
+ */
+s32 igc_setup_link(struct igc_hw *hw)
+{
+	s32 ret_val = 0;
+
+	/* In the case of the phy reset being blocked, we already have a link.
+	 * We do not need to set it up again.
+	 */
+
+	/* If requested flow control is set to default, set flow control
+	 * based on the EEPROM flow control settings.
+	 */
+	if (hw->fc.requested_mode == igc_fc_default) {
+		ret_val = igc_set_default_fc(hw);
+		if (ret_val)
+			goto out;
+	}
+
+	/* We want to save off the original Flow Control configuration just
+	 * in case we get disconnected and then reconnected into a different
+	 * hub or switch with different Flow Control capabilities.
+	 */
+	hw->fc.current_mode = hw->fc.requested_mode;
+
+	hw_dbg("After fix-ups FlowControl is now = %x\n", hw->fc.current_mode);
+
+	/* Call the necessary media_type subroutine to configure the link. */
+	ret_val = hw->mac.ops.setup_physical_interface(hw);
+	if (ret_val)
+		goto out;
+
+	/* Initialize the flow control address, type, and PAUSE timer
+	 * registers to their default values.  This is done even if flow
+	 * control is disabled, because it does not hurt anything to
+	 * initialize these registers.
+	 */
+	hw_dbg("Initializing the Flow Control address, type and timer regs\n");
+	wr32(IGC_FCT, FLOW_CONTROL_TYPE);
+	wr32(IGC_FCAH, FLOW_CONTROL_ADDRESS_HIGH);
+	wr32(IGC_FCAL, FLOW_CONTROL_ADDRESS_LOW);
+
+	wr32(IGC_FCTTV, hw->fc.pause_time);
+
+	ret_val = igc_set_fc_watermarks(hw);
+
+out:
+	return ret_val;
+}
+
+/**
+ * igc_set_default_fc - Set flow control default values
+ * @hw: pointer to the HW structure
+ *
+ * Read the EEPROM for the default values for flow control and store the
+ * values.
+ */
+static s32 igc_set_default_fc(struct igc_hw *hw)
+{
+	return 0;
+}
+
+/**
+ * igc_set_fc_watermarks - Set flow control high/low watermarks
+ * @hw: pointer to the HW structure
+ *
+ * Sets the flow control high/low threshold (watermark) registers.  If
+ * flow control XON frame transmission is enabled, then set XON frame
+ * transmission as well.
+ */
+static s32 igc_set_fc_watermarks(struct igc_hw *hw)
+{
+	u32 fcrtl = 0, fcrth = 0;
+
+	/* Set the flow control receive threshold registers.  Normally,
+	 * these registers will be set to a default threshold that may be
+	 * adjusted later by the driver's runtime code.  However, if the
+	 * ability to transmit pause frames is not enabled, then these
+	 * registers will be set to 0.
+	 */
+	if (hw->fc.current_mode & igc_fc_tx_pause) {
+		/* We need to set up the Receive Threshold high and low water
+		 * marks as well as (optionally) enabling the transmission of
+		 * XON frames.
+		 */
+		fcrtl = hw->fc.low_water;
+		if (hw->fc.send_xon)
+			fcrtl |= IGC_FCRTL_XONE;
+
+		fcrth = hw->fc.high_water;
+	}
+	wr32(IGC_FCRTL, fcrtl);
+	wr32(IGC_FCRTH, fcrth);
+
+	return 0;
+}
+
+/**
+ * igc_clear_hw_cntrs_base - Clear base hardware counters
+ * @hw: pointer to the HW structure
+ *
+ * Clears the base hardware counters by reading the counter registers.
+ */
+void igc_clear_hw_cntrs_base(struct igc_hw *hw)
+{
+	rd32(IGC_CRCERRS);
+	rd32(IGC_SYMERRS);
+	rd32(IGC_MPC);
+	rd32(IGC_SCC);
+	rd32(IGC_ECOL);
+	rd32(IGC_MCC);
+	rd32(IGC_LATECOL);
+	rd32(IGC_COLC);
+	rd32(IGC_DC);
+	rd32(IGC_SEC);
+	rd32(IGC_RLEC);
+	rd32(IGC_XONRXC);
+	rd32(IGC_XONTXC);
+	rd32(IGC_XOFFRXC);
+	rd32(IGC_XOFFTXC);
+	rd32(IGC_FCRUC);
+	rd32(IGC_GPRC);
+	rd32(IGC_BPRC);
+	rd32(IGC_MPRC);
+	rd32(IGC_GPTC);
+	rd32(IGC_GORCL);
+	rd32(IGC_GORCH);
+	rd32(IGC_GOTCL);
+	rd32(IGC_GOTCH);
+	rd32(IGC_RNBC);
+	rd32(IGC_RUC);
+	rd32(IGC_RFC);
+	rd32(IGC_ROC);
+	rd32(IGC_RJC);
+	rd32(IGC_TORL);
+	rd32(IGC_TORH);
+	rd32(IGC_TOTL);
+	rd32(IGC_TOTH);
+	rd32(IGC_TPR);
+	rd32(IGC_TPT);
+	rd32(IGC_MPTC);
+	rd32(IGC_BPTC);
+
+	rd32(IGC_PRC64);
+	rd32(IGC_PRC127);
+	rd32(IGC_PRC255);
+	rd32(IGC_PRC511);
+	rd32(IGC_PRC1023);
+	rd32(IGC_PRC1522);
+	rd32(IGC_PTC64);
+	rd32(IGC_PTC127);
+	rd32(IGC_PTC255);
+	rd32(IGC_PTC511);
+	rd32(IGC_PTC1023);
+	rd32(IGC_PTC1522);
+
+	rd32(IGC_ALGNERRC);
+	rd32(IGC_RXERRC);
+	rd32(IGC_TNCRS);
+	rd32(IGC_CEXTERR);
+	rd32(IGC_TSCTC);
+	rd32(IGC_TSCTFC);
+
+	rd32(IGC_MGTPRC);
+	rd32(IGC_MGTPDC);
+	rd32(IGC_MGTPTC);
+
+	rd32(IGC_IAC);
+	rd32(IGC_ICRXOC);
+
+	rd32(IGC_ICRXPTC);
+	rd32(IGC_ICRXATC);
+	rd32(IGC_ICTXPTC);
+	rd32(IGC_ICTXATC);
+	rd32(IGC_ICTXQEC);
+	rd32(IGC_ICTXQMTC);
+	rd32(IGC_ICRXDMTC);
+
+	rd32(IGC_CBTMPC);
+	rd32(IGC_HTDPMC);
+	rd32(IGC_CBRMPC);
+	rd32(IGC_RPTHC);
+	rd32(IGC_HGPTC);
+	rd32(IGC_HTCBDPC);
+	rd32(IGC_HGORCL);
+	rd32(IGC_HGORCH);
+	rd32(IGC_HGOTCL);
+	rd32(IGC_HGOTCH);
+	rd32(IGC_LENERRS);
+}
+
+/**
+ * igc_get_auto_rd_done - Check for auto read completion
+ * @hw: pointer to the HW structure
+ *
+ * Check EEPROM for Auto Read done bit.
+ */
+s32 igc_get_auto_rd_done(struct igc_hw *hw)
+{
+	s32 ret_val = 0;
+	s32 i = 0;
+
+	while (i < AUTO_READ_DONE_TIMEOUT) {
+		if (rd32(IGC_EECD) & IGC_EECD_AUTO_RD)
+			break;
+		usleep_range(1000, 2000);
+		i++;
+	}
+
+	if (i == AUTO_READ_DONE_TIMEOUT) {
+		hw_dbg("Auto read by HW from NVM has not completed.\n");
+		ret_val = -IGC_ERR_RESET;
+		goto out;
+	}
+
+out:
+	return ret_val;
+}
+
+/**
+ * igc_put_hw_semaphore - Release hardware semaphore
+ * @hw: pointer to the HW structure
+ *
+ * Release hardware semaphore used to access the PHY or NVM
+ */
+void igc_put_hw_semaphore(struct igc_hw *hw)
+{
+	u32 swsm;
+
+	swsm = rd32(IGC_SWSM);
+
+	swsm &= ~(IGC_SWSM_SMBI | IGC_SWSM_SWESMBI);
+
+	wr32(IGC_SWSM, swsm);
+}