1 files changed, 500 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..d168a6435322
--- /dev/null
+++ b/drivers/net/ethernet/pensando/ionic/ionic_dev.c
@@ -0,0 +1,500 @@
+// 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"
+#include "ionic_lif.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);
+}
+
+/* Port commands */
+void ionic_dev_cmd_port_identify(struct ionic_dev *idev)
+{
+	union ionic_dev_cmd cmd = {
+		.port_init.opcode = IONIC_CMD_PORT_IDENTIFY,
+		.port_init.index = 0,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_port_init(struct ionic_dev *idev)
+{
+	union ionic_dev_cmd cmd = {
+		.port_init.opcode = IONIC_CMD_PORT_INIT,
+		.port_init.index = 0,
+		.port_init.info_pa = cpu_to_le64(idev->port_info_pa),
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_port_reset(struct ionic_dev *idev)
+{
+	union ionic_dev_cmd cmd = {
+		.port_reset.opcode = IONIC_CMD_PORT_RESET,
+		.port_reset.index = 0,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_port_state(struct ionic_dev *idev, u8 state)
+{
+	union ionic_dev_cmd cmd = {
+		.port_setattr.opcode = IONIC_CMD_PORT_SETATTR,
+		.port_setattr.index = 0,
+		.port_setattr.attr = IONIC_PORT_ATTR_STATE,
+		.port_setattr.state = state,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_port_speed(struct ionic_dev *idev, u32 speed)
+{
+	union ionic_dev_cmd cmd = {
+		.port_setattr.opcode = IONIC_CMD_PORT_SETATTR,
+		.port_setattr.index = 0,
+		.port_setattr.attr = IONIC_PORT_ATTR_SPEED,
+		.port_setattr.speed = cpu_to_le32(speed),
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_port_autoneg(struct ionic_dev *idev, u8 an_enable)
+{
+	union ionic_dev_cmd cmd = {
+		.port_setattr.opcode = IONIC_CMD_PORT_SETATTR,
+		.port_setattr.index = 0,
+		.port_setattr.attr = IONIC_PORT_ATTR_AUTONEG,
+		.port_setattr.an_enable = an_enable,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_port_fec(struct ionic_dev *idev, u8 fec_type)
+{
+	union ionic_dev_cmd cmd = {
+		.port_setattr.opcode = IONIC_CMD_PORT_SETATTR,
+		.port_setattr.index = 0,
+		.port_setattr.attr = IONIC_PORT_ATTR_FEC,
+		.port_setattr.fec_type = fec_type,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_port_pause(struct ionic_dev *idev, u8 pause_type)
+{
+	union ionic_dev_cmd cmd = {
+		.port_setattr.opcode = IONIC_CMD_PORT_SETATTR,
+		.port_setattr.index = 0,
+		.port_setattr.attr = IONIC_PORT_ATTR_PAUSE,
+		.port_setattr.pause_type = pause_type,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+/* LIF commands */
+void ionic_dev_cmd_lif_identify(struct ionic_dev *idev, u8 type, u8 ver)
+{
+	union ionic_dev_cmd cmd = {
+		.lif_identify.opcode = IONIC_CMD_LIF_IDENTIFY,
+		.lif_identify.type = type,
+		.lif_identify.ver = ver,
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_lif_init(struct ionic_dev *idev, u16 lif_index,
+			    dma_addr_t info_pa)
+{
+	union ionic_dev_cmd cmd = {
+		.lif_init.opcode = IONIC_CMD_LIF_INIT,
+		.lif_init.index = cpu_to_le16(lif_index),
+		.lif_init.info_pa = cpu_to_le64(info_pa),
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_lif_reset(struct ionic_dev *idev, u16 lif_index)
+{
+	union ionic_dev_cmd cmd = {
+		.lif_init.opcode = IONIC_CMD_LIF_RESET,
+		.lif_init.index = cpu_to_le16(lif_index),
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+void ionic_dev_cmd_adminq_init(struct ionic_dev *idev, struct ionic_qcq *qcq,
+			       u16 lif_index, u16 intr_index)
+{
+	struct ionic_queue *q = &qcq->q;
+	struct ionic_cq *cq = &qcq->cq;
+
+	union ionic_dev_cmd cmd = {
+		.q_init.opcode = IONIC_CMD_Q_INIT,
+		.q_init.lif_index = cpu_to_le16(lif_index),
+		.q_init.type = q->type,
+		.q_init.index = cpu_to_le32(q->index),
+		.q_init.flags = cpu_to_le16(IONIC_QINIT_F_IRQ |
+					    IONIC_QINIT_F_ENA),
+		.q_init.pid = cpu_to_le16(q->pid),
+		.q_init.intr_index = cpu_to_le16(intr_index),
+		.q_init.ring_size = ilog2(q->num_descs),
+		.q_init.ring_base = cpu_to_le64(q->base_pa),
+		.q_init.cq_ring_base = cpu_to_le64(cq->base_pa),
+	};
+
+	ionic_dev_cmd_go(idev, &cmd);
+}
+
+int ionic_db_page_num(struct ionic_lif *lif, int pid)
+{
+	return (lif->hw_index * lif->dbid_count) + pid;
+}
+
+int ionic_cq_init(struct ionic_lif *lif, struct ionic_cq *cq,
+		  struct ionic_intr_info *intr,
+		  unsigned int num_descs, size_t desc_size)
+{
+	struct ionic_cq_info *cur;
+	unsigned int ring_size;
+	unsigned int i;
+
+	if (desc_size == 0 || !is_power_of_2(num_descs))
+		return -EINVAL;
+
+	ring_size = ilog2(num_descs);
+	if (ring_size < 2 || ring_size > 16)
+		return -EINVAL;
+
+	cq->lif = lif;
+	cq->bound_intr = intr;
+	cq->num_descs = num_descs;
+	cq->desc_size = desc_size;
+	cq->tail = cq->info;
+	cq->done_color = 1;
+
+	cur = cq->info;
+
+	for (i = 0; i < num_descs; i++) {
+		if (i + 1 == num_descs) {
+			cur->next = cq->info;
+			cur->last = true;
+		} else {
+			cur->next = cur + 1;
+		}
+		cur->index = i;
+		cur++;
+	}
+
+	return 0;
+}
+
+void ionic_cq_map(struct ionic_cq *cq, void *base, dma_addr_t base_pa)
+{
+	struct ionic_cq_info *cur;
+	unsigned int i;
+
+	cq->base = base;
+	cq->base_pa = base_pa;
+
+	for (i = 0, cur = cq->info; i < cq->num_descs; i++, cur++)
+		cur->cq_desc = base + (i * cq->desc_size);
+}
+
+void ionic_cq_bind(struct ionic_cq *cq, struct ionic_queue *q)
+{
+	cq->bound_q = q;
+}
+
+unsigned int ionic_cq_service(struct ionic_cq *cq, unsigned int work_to_do,
+			      ionic_cq_cb cb, ionic_cq_done_cb done_cb,
+			      void *done_arg)
+{
+	unsigned int work_done = 0;
+
+	if (work_to_do == 0)
+		return 0;
+
+	while (cb(cq, cq->tail)) {
+		if (cq->tail->last)
+			cq->done_color = !cq->done_color;
+		cq->tail = cq->tail->next;
+		DEBUG_STATS_CQE_CNT(cq);
+
+		if (++work_done >= work_to_do)
+			break;
+	}
+
+	if (work_done && done_cb)
+		done_cb(done_arg);
+
+	return work_done;
+}
+
+int ionic_q_init(struct ionic_lif *lif, struct ionic_dev *idev,
+		 struct ionic_queue *q, unsigned int index, const char *name,
+		 unsigned int num_descs, size_t desc_size,
+		 size_t sg_desc_size, unsigned int pid)
+{
+	struct ionic_desc_info *cur;
+	unsigned int ring_size;
+	unsigned int i;
+
+	if (desc_size == 0 || !is_power_of_2(num_descs))
+		return -EINVAL;
+
+	ring_size = ilog2(num_descs);
+	if (ring_size < 2 || ring_size > 16)
+		return -EINVAL;
+
+	q->lif = lif;
+	q->idev = idev;
+	q->index = index;
+	q->num_descs = num_descs;
+	q->desc_size = desc_size;
+	q->sg_desc_size = sg_desc_size;
+	q->tail = q->info;
+	q->head = q->tail;
+	q->pid = pid;
+
+	snprintf(q->name, sizeof(q->name), "L%d-%s%u", lif->index, name, index);
+
+	cur = q->info;
+
+	for (i = 0; i < num_descs; i++) {
+		if (i + 1 == num_descs)
+			cur->next = q->info;
+		else
+			cur->next = cur + 1;
+		cur->index = i;
+		cur->left = num_descs - i;
+		cur++;
+	}
+
+	return 0;
+}
+
+void ionic_q_map(struct ionic_queue *q, void *base, dma_addr_t base_pa)
+{
+	struct ionic_desc_info *cur;
+	unsigned int i;
+
+	q->base = base;
+	q->base_pa = base_pa;
+
+	for (i = 0, cur = q->info; i < q->num_descs; i++, cur++)
+		cur->desc = base + (i * q->desc_size);
+}
+
+void ionic_q_sg_map(struct ionic_queue *q, void *base, dma_addr_t base_pa)
+{
+	struct ionic_desc_info *cur;
+	unsigned int i;
+
+	q->sg_base = base;
+	q->sg_base_pa = base_pa;
+
+	for (i = 0, cur = q->info; i < q->num_descs; i++, cur++)
+		cur->sg_desc = base + (i * q->sg_desc_size);
+}
+
+void ionic_q_post(struct ionic_queue *q, bool ring_doorbell, ionic_desc_cb cb,
+		  void *cb_arg)
+{
+	struct device *dev = q->lif->ionic->dev;
+	struct ionic_lif *lif = q->lif;
+
+	q->head->cb = cb;
+	q->head->cb_arg = cb_arg;
+	q->head = q->head->next;
+
+	dev_dbg(dev, "lif=%d qname=%s qid=%d qtype=%d p_index=%d ringdb=%d\n",
+		q->lif->index, q->name, q->hw_type, q->hw_index,
+		q->head->index, ring_doorbell);
+
+	if (ring_doorbell)
+		ionic_dbell_ring(lif->kern_dbpage, q->hw_type,
+				 q->dbval | q->head->index);
+}
+
+static bool ionic_q_is_posted(struct ionic_queue *q, unsigned int pos)
+{
+	unsigned int mask, tail, head;
+
+	mask = q->num_descs - 1;
+	tail = q->tail->index;
+	head = q->head->index;
+
+	return ((pos - tail) & mask) < ((head - tail) & mask);
+}
+
+void ionic_q_service(struct ionic_queue *q, struct ionic_cq_info *cq_info,
+		     unsigned int stop_index)
+{
+	struct ionic_desc_info *desc_info;
+	ionic_desc_cb cb;
+	void *cb_arg;
+
+	/* check for empty queue */
+	if (q->tail->index == q->head->index)
+		return;
+
+	/* stop index must be for a descriptor that is not yet completed */
+	if (unlikely(!ionic_q_is_posted(q, stop_index)))
+		dev_err(q->lif->ionic->dev,
+			"ionic stop is not posted %s stop %u tail %u head %u\n",
+			q->name, stop_index, q->tail->index, q->head->index);
+
+	do {
+		desc_info = q->tail;
+		q->tail = desc_info->next;
+
+		cb = desc_info->cb;
+		cb_arg = desc_info->cb_arg;
+
+		desc_info->cb = NULL;
+		desc_info->cb_arg = NULL;
+
+		if (cb)
+			cb(q, desc_info, cq_info, cb_arg);
+	} while (desc_info->index != stop_index);
+}