ionic: Add hardware init and device commands

The ionic device has a small set of PCI registers, including a
device control and data space, and a large set of message
commands.

Also adds new DEVLINK_INFO_VERSION_GENERIC tags for
ASIC_ID, ASIC_REV, and FW.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 136 insertions, 0 deletions

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_dev.c b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
new file mode 100644
index 000000000000..0bf1bd6bd7b1
--- /dev/null
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/etherdevice.h>
+#include "ionic.h"
+#include "ionic_dev.h"
+
+void ionic_init_devinfo(struct ionic *ionic)
+{
+	struct ionic_dev *idev = &ionic->idev;
+
+	idev->dev_info.asic_type = ioread8(&idev->dev_info_regs->asic_type);
+	idev->dev_info.asic_rev = ioread8(&idev->dev_info_regs->asic_rev);
+
+	memcpy_fromio(idev->dev_info.fw_version,
+		      idev->dev_info_regs->fw_version,
+		      IONIC_DEVINFO_FWVERS_BUFLEN);
+
+	memcpy_fromio(idev->dev_info.serial_num,
+		      idev->dev_info_regs->serial_num,
+		      IONIC_DEVINFO_SERIAL_BUFLEN);
+
+	idev->dev_info.fw_version[IONIC_DEVINFO_FWVERS_BUFLEN] = 0;
+	idev->dev_info.serial_num[IONIC_DEVINFO_SERIAL_BUFLEN] = 0;
+
+	dev_dbg(ionic->dev, "fw_version %s\n", idev->dev_info.fw_version);
+}
+
+int ionic_dev_setup(struct ionic *ionic)
+{
+	struct ionic_dev_bar *bar = ionic->bars;
+	unsigned int num_bars = ionic->num_bars;
+	struct ionic_dev *idev = &ionic->idev;
+	struct device *dev = ionic->dev;
+	u32 sig;
+
+	/* BAR0: dev_cmd and interrupts */
+	if (num_bars < 1) {
+		dev_err(dev, "No bars found, aborting\n");
+		return -EFAULT;
+	}
+
+	if (bar->len < IONIC_BAR0_SIZE) {
+		dev_err(dev, "Resource bar size %lu too small, aborting\n",
+			bar->len);
+		return -EFAULT;
+	}
+
+	idev->dev_info_regs = bar->vaddr + IONIC_BAR0_DEV_INFO_REGS_OFFSET;
+	idev->dev_cmd_regs = bar->vaddr + IONIC_BAR0_DEV_CMD_REGS_OFFSET;
+	idev->intr_status = bar->vaddr + IONIC_BAR0_INTR_STATUS_OFFSET;
+	idev->intr_ctrl = bar->vaddr + IONIC_BAR0_INTR_CTRL_OFFSET;
+
+	sig = ioread32(&idev->dev_info_regs->signature);
+	if (sig != IONIC_DEV_INFO_SIGNATURE) {
+		dev_err(dev, "Incompatible firmware signature %x", sig);
+		return -EFAULT;
+	}
+
+	ionic_init_devinfo(ionic);
+
+	/* BAR1: doorbells */
+	bar++;
+	if (num_bars < 2) {
+		dev_err(dev, "Doorbell bar missing, aborting\n");
+		return -EFAULT;
+	}
+
+	idev->db_pages = bar->vaddr;
+	idev->phy_db_pages = bar->bus_addr;
+
+	return 0;
+}
+
+void ionic_dev_teardown(struct ionic *ionic)
+{
+	/* place holder */
+}
+
+/* Devcmd Interface */
+u8 ionic_dev_cmd_status(struct ionic_dev *idev)
+{
+	return ioread8(&idev->dev_cmd_regs->comp.comp.status);
+}
+
+bool ionic_dev_cmd_done(struct ionic_dev *idev)
+{
+	return ioread32(&idev->dev_cmd_regs->done) & IONIC_DEV_CMD_DONE;
+}
+
+void ionic_dev_cmd_comp(struct ionic_dev *idev, union ionic_dev_cmd_comp *comp)
+{
+	memcpy_fromio(comp, &idev->dev_cmd_regs->comp, sizeof(*comp));
+}
+
+void ionic_dev_cmd_go(struct ionic_dev *idev, union ionic_dev_cmd *cmd)
+{
+	memcpy_toio(&idev->dev_cmd_regs->cmd, cmd, sizeof(*cmd));
+	iowrite32(0, &idev->dev_cmd_regs->done);
+	iowrite32(1, &idev->dev_cmd_regs->doorbell);
+}
+
+/* Device commands */
+void ionic_dev_cmd_identify(struct ionic_dev *idev, u8 ver)
+{
+	union ionic_dev_cmd cmd = {
+		.identify.opcode = IONIC_CMD_IDENTIFY,
+		.identify.ver = ver,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_init(struct ionic_dev *idev)
+{
+	union ionic_dev_cmd cmd = {
+		.init.opcode = IONIC_CMD_INIT,
+		.init.type = 0,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_reset(struct ionic_dev *idev)
+{
+	union ionic_dev_cmd cmd = {
+		.reset.opcode = IONIC_CMD_RESET,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}