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, 141 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc_i225.c b/drivers/net/ethernet/intel/igc/igc_i225.c
new file mode 100644
index 000000000000..fb1487727d79
--- /dev/null
+++ b/drivers/net/ethernet/intel/igc/igc_i225.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c)  2018 Intel Corporation */
+
+#include <linux/delay.h>
+
+#include "igc_hw.h"
+
+/**
+ * igc_get_hw_semaphore_i225 - Acquire hardware semaphore
+ * @hw: pointer to the HW structure
+ *
+ * Acquire the HW semaphore to access the PHY or NVM
+ */
+static s32 igc_get_hw_semaphore_i225(struct igc_hw *hw)
+{
+	s32 timeout = hw->nvm.word_size + 1;
+	s32 i = 0;
+	u32 swsm;
+
+	/* Get the SW semaphore */
+	while (i < timeout) {
+		swsm = rd32(IGC_SWSM);
+		if (!(swsm & IGC_SWSM_SMBI))
+			break;
+
+		usleep_range(500, 600);
+		i++;
+	}
+
+	if (i == timeout) {
+		/* In rare circumstances, the SW semaphore may already be held
+		 * unintentionally. Clear the semaphore once before giving up.
+		 */
+		if (hw->dev_spec._base.clear_semaphore_once) {
+			hw->dev_spec._base.clear_semaphore_once = false;
+			igc_put_hw_semaphore(hw);
+			for (i = 0; i < timeout; i++) {
+				swsm = rd32(IGC_SWSM);
+				if (!(swsm & IGC_SWSM_SMBI))
+					break;
+
+				usleep_range(500, 600);
+			}
+		}
+
+		/* If we do not have the semaphore here, we have to give up. */
+		if (i == timeout) {
+			hw_dbg("Driver can't access device - SMBI bit is set.\n");
+			return -IGC_ERR_NVM;
+		}
+	}
+
+	/* Get the FW semaphore. */
+	for (i = 0; i < timeout; i++) {
+		swsm = rd32(IGC_SWSM);
+		wr32(IGC_SWSM, swsm | IGC_SWSM_SWESMBI);
+
+		/* Semaphore acquired if bit latched */
+		if (rd32(IGC_SWSM) & IGC_SWSM_SWESMBI)
+			break;
+
+		usleep_range(500, 600);
+	}
+
+	if (i == timeout) {
+		/* Release semaphores */
+		igc_put_hw_semaphore(hw);
+		hw_dbg("Driver can't access the NVM\n");
+		return -IGC_ERR_NVM;
+	}
+
+	return 0;
+}
+
+/**
+ * igc_acquire_swfw_sync_i225 - Acquire SW/FW semaphore
+ * @hw: pointer to the HW structure
+ * @mask: specifies which semaphore to acquire
+ *
+ * Acquire the SW/FW semaphore to access the PHY or NVM.  The mask
+ * will also specify which port we're acquiring the lock for.
+ */
+s32 igc_acquire_swfw_sync_i225(struct igc_hw *hw, u16 mask)
+{
+	s32 i = 0, timeout = 200;
+	u32 fwmask = mask << 16;
+	u32 swmask = mask;
+	s32 ret_val = 0;
+	u32 swfw_sync;
+
+	while (i < timeout) {
+		if (igc_get_hw_semaphore_i225(hw)) {
+			ret_val = -IGC_ERR_SWFW_SYNC;
+			goto out;
+		}
+
+		swfw_sync = rd32(IGC_SW_FW_SYNC);
+		if (!(swfw_sync & (fwmask | swmask)))
+			break;
+
+		/* Firmware currently using resource (fwmask) */
+		igc_put_hw_semaphore(hw);
+		mdelay(5);
+		i++;
+	}
+
+	if (i == timeout) {
+		hw_dbg("Driver can't access resource, SW_FW_SYNC timeout.\n");
+		ret_val = -IGC_ERR_SWFW_SYNC;
+		goto out;
+	}
+
+	swfw_sync |= swmask;
+	wr32(IGC_SW_FW_SYNC, swfw_sync);
+
+	igc_put_hw_semaphore(hw);
+out:
+	return ret_val;
+}
+
+/**
+ * igc_release_swfw_sync_i225 - Release SW/FW semaphore
+ * @hw: pointer to the HW structure
+ * @mask: specifies which semaphore to acquire
+ *
+ * Release the SW/FW semaphore used to access the PHY or NVM.  The mask
+ * will also specify which port we're releasing the lock for.
+ */
+void igc_release_swfw_sync_i225(struct igc_hw *hw, u16 mask)
+{
+	u32 swfw_sync;
+
+	while (igc_get_hw_semaphore_i225(hw))
+		; /* Empty */
+
+	swfw_sync = rd32(IGC_SW_FW_SYNC);
+	swfw_sync &= ~mask;
+	wr32(IGC_SW_FW_SYNC, swfw_sync);
+
+	igc_put_hw_semaphore(hw);
+}