sfc: Add support for SFC9000 family (2)

This integrates support for the SFC9000 family of 10G Ethernet
controllers and LAN-on-motherboard chips, starting with the SFL9021
'Siena' and SFC9020 'Bethpage'.

Credit for this code is largely due to my colleagues at Solarflare:

   Guido Barzini
   Steve Hodgson
   Kieran Mansley
   Matthew Slattery
   Neil Turton

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 262 insertions, 5 deletions

diff --git a/drivers/net/sfc/mtd.c b/drivers/net/sfc/mtd.c
index 65a22f1..ef561f8 100644
--- a/drivers/net/sfc/mtd.c
+++ b/drivers/net/sfc/mtd.c
@@ -8,6 +8,7 @@
  * by the Free Software Foundation, incorporated herein by reference.
  */
 
+#include <linux/bitops.h>
 #include <linux/module.h>
 #include <linux/mtd/mtd.h>
 #include <linux/delay.h>
@@ -18,12 +19,22 @@
 #include "spi.h"
 #include "efx.h"
 #include "nic.h"
+#include "mcdi.h"
+#include "mcdi_pcol.h"
 
 #define EFX_SPI_VERIFY_BUF_LEN 16
+#define EFX_MCDI_CHUNK_LEN 128
 
 struct efx_mtd_partition {
 	struct mtd_info mtd;
-	size_t offset;
+	union {
+		struct {
+			bool updating;
+			u8 nvram_type;
+			u16 fw_subtype;
+		} mcdi;
+		size_t offset;
+	};
 	const char *type_name;
 	char name[IFNAMSIZ + 20];
 };
@@ -56,6 +67,7 @@ struct efx_mtd {
 	container_of(mtd, struct efx_mtd_partition, mtd)
 
 static int falcon_mtd_probe(struct efx_nic *efx);
+static int siena_mtd_probe(struct efx_nic *efx);
 
 /* SPI utilities */
 
@@ -223,9 +235,14 @@ static void efx_mtd_rename_device(struct efx_mtd *efx_mtd)
 	struct efx_mtd_partition *part;
 
 	efx_for_each_partition(part, efx_mtd)
-		snprintf(part->name, sizeof(part->name),
-			 "%s %s", efx_mtd->efx->name,
-			 part->type_name);
+		if (efx_nic_rev(efx_mtd->efx) >= EFX_REV_SIENA_A0)
+			snprintf(part->name, sizeof(part->name),
+				 "%s %s:%02x", efx_mtd->efx->name,
+				 part->type_name, part->mcdi.fw_subtype);
+		else
+			snprintf(part->name, sizeof(part->name),
+				 "%s %s", efx_mtd->efx->name,
+				 part->type_name);
 }
 
 static int efx_mtd_probe_device(struct efx_nic *efx, struct efx_mtd *efx_mtd)
@@ -285,7 +302,10 @@ void efx_mtd_rename(struct efx_nic *efx)
 
 int efx_mtd_probe(struct efx_nic *efx)
 {
-	return falcon_mtd_probe(efx);
+	if (efx_nic_rev(efx) >= EFX_REV_SIENA_A0)
+		return siena_mtd_probe(efx);
+	else
+		return falcon_mtd_probe(efx);
 }
 
 /* Implementation of MTD operations for Falcon */
@@ -393,3 +413,240 @@ static int falcon_mtd_probe(struct efx_nic *efx)
 		kfree(efx_mtd);
 	return rc;
 }
+
+/* Implementation of MTD operations for Siena */
+
+static int siena_mtd_read(struct mtd_info *mtd, loff_t start,
+			  size_t len, size_t *retlen, u8 *buffer)
+{
+	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
+	struct efx_mtd *efx_mtd = mtd->priv;
+	struct efx_nic *efx = efx_mtd->efx;
+	loff_t offset = start;
+	loff_t end = min_t(loff_t, start + len, mtd->size);
+	size_t chunk;
+	int rc = 0;
+
+	while (offset < end) {
+		chunk = min_t(size_t, end - offset, EFX_MCDI_CHUNK_LEN);
+		rc = efx_mcdi_nvram_read(efx, part->mcdi.nvram_type, offset,
+					 buffer, chunk);
+		if (rc)
+			goto out;
+		offset += chunk;
+		buffer += chunk;
+	}
+out:
+	*retlen = offset - start;
+	return rc;
+}
+
+static int siena_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
+{
+	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
+	struct efx_mtd *efx_mtd = mtd->priv;
+	struct efx_nic *efx = efx_mtd->efx;
+	loff_t offset = start & ~((loff_t)(mtd->erasesize - 1));
+	loff_t end = min_t(loff_t, start + len, mtd->size);
+	size_t chunk = part->mtd.erasesize;
+	int rc = 0;
+
+	if (!part->mcdi.updating) {
+		rc = efx_mcdi_nvram_update_start(efx, part->mcdi.nvram_type);
+		if (rc)
+			goto out;
+		part->mcdi.updating = 1;
+	}
+
+	/* The MCDI interface can in fact do multiple erase blocks at once;
+	 * but erasing may be slow, so we make multiple calls here to avoid
+	 * tripping the MCDI RPC timeout. */
+	while (offset < end) {
+		rc = efx_mcdi_nvram_erase(efx, part->mcdi.nvram_type, offset,
+					  chunk);
+		if (rc)
+			goto out;
+		offset += chunk;
+	}
+out:
+	return rc;
+}
+
+static int siena_mtd_write(struct mtd_info *mtd, loff_t start,
+			   size_t len, size_t *retlen, const u8 *buffer)
+{
+	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
+	struct efx_mtd *efx_mtd = mtd->priv;
+	struct efx_nic *efx = efx_mtd->efx;
+	loff_t offset = start;
+	loff_t end = min_t(loff_t, start + len, mtd->size);
+	size_t chunk;
+	int rc = 0;
+
+	if (!part->mcdi.updating) {
+		rc = efx_mcdi_nvram_update_start(efx, part->mcdi.nvram_type);
+		if (rc)
+			goto out;
+		part->mcdi.updating = 1;
+	}
+
+	while (offset < end) {
+		chunk = min_t(size_t, end - offset, EFX_MCDI_CHUNK_LEN);
+		rc = efx_mcdi_nvram_write(efx, part->mcdi.nvram_type, offset,
+					  buffer, chunk);
+		if (rc)
+			goto out;
+		offset += chunk;
+		buffer += chunk;
+	}
+out:
+	*retlen = offset - start;
+	return rc;
+}
+
+static int siena_mtd_sync(struct mtd_info *mtd)
+{
+	struct efx_mtd_partition *part = to_efx_mtd_partition(mtd);
+	struct efx_mtd *efx_mtd = mtd->priv;
+	struct efx_nic *efx = efx_mtd->efx;
+	int rc = 0;
+
+	if (part->mcdi.updating) {
+		part->mcdi.updating = 0;
+		rc = efx_mcdi_nvram_update_finish(efx, part->mcdi.nvram_type);
+	}
+
+	return rc;
+}
+
+static struct efx_mtd_ops siena_mtd_ops = {
+	.read	= siena_mtd_read,
+	.erase	= siena_mtd_erase,
+	.write	= siena_mtd_write,
+	.sync	= siena_mtd_sync,
+};
+
+struct siena_nvram_type_info {
+	int port;
+	const char *name;
+};
+
+static struct siena_nvram_type_info siena_nvram_types[] = {
+	[MC_CMD_NVRAM_TYPE_DISABLED_CALLISTO]	= { 0, "sfc_dummy_phy" },
+	[MC_CMD_NVRAM_TYPE_MC_FW]		= { 0, "sfc_mcfw" },
+	[MC_CMD_NVRAM_TYPE_MC_FW_BACKUP]	= { 0, "sfc_mcfw_backup" },
+	[MC_CMD_NVRAM_TYPE_STATIC_CFG_PORT0]	= { 0, "sfc_static_cfg" },
+	[MC_CMD_NVRAM_TYPE_STATIC_CFG_PORT1]	= { 1, "sfc_static_cfg" },
+	[MC_CMD_NVRAM_TYPE_DYNAMIC_CFG_PORT0]	= { 0, "sfc_dynamic_cfg" },
+	[MC_CMD_NVRAM_TYPE_DYNAMIC_CFG_PORT1]	= { 1, "sfc_dynamic_cfg" },
+	[MC_CMD_NVRAM_TYPE_EXP_ROM]		= { 0, "sfc_exp_rom" },
+	[MC_CMD_NVRAM_TYPE_EXP_ROM_CFG_PORT0]	= { 0, "sfc_exp_rom_cfg" },
+	[MC_CMD_NVRAM_TYPE_EXP_ROM_CFG_PORT1]	= { 1, "sfc_exp_rom_cfg" },
+	[MC_CMD_NVRAM_TYPE_PHY_PORT0]		= { 0, "sfc_phy_fw" },
+	[MC_CMD_NVRAM_TYPE_PHY_PORT1]		= { 1, "sfc_phy_fw" },
+};
+
+static int siena_mtd_probe_partition(struct efx_nic *efx,
+				     struct efx_mtd *efx_mtd,
+				     unsigned int part_id,
+				     unsigned int type)
+{
+	struct efx_mtd_partition *part = &efx_mtd->part[part_id];
+	struct siena_nvram_type_info *info;
+	size_t size, erase_size;
+	bool protected;
+	int rc;
+
+	if (type >= ARRAY_SIZE(siena_nvram_types))
+		return -ENODEV;
+
+	info = &siena_nvram_types[type];
+
+	if (info->port != efx_port_num(efx))
+		return -ENODEV;
+
+	rc = efx_mcdi_nvram_info(efx, type, &size, &erase_size, &protected);
+	if (rc)
+		return rc;
+	if (protected)
+		return -ENODEV; /* hide it */
+
+	part->mcdi.nvram_type = type;
+	part->type_name = info->name;
+
+	part->mtd.type = MTD_NORFLASH;
+	part->mtd.flags = MTD_CAP_NORFLASH;
+	part->mtd.size = size;
+	part->mtd.erasesize = erase_size;
+
+	return 0;
+}
+
+static int siena_mtd_get_fw_subtypes(struct efx_nic *efx,
+				     struct efx_mtd *efx_mtd)
+{
+	struct efx_mtd_partition *part;
+	uint16_t fw_subtype_list[MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_LEN /
+				 sizeof(uint16_t)];
+	int rc;
+
+	rc = efx_mcdi_get_board_cfg(efx, NULL, fw_subtype_list);
+	if (rc)
+		return rc;
+
+	efx_for_each_partition(part, efx_mtd)
+		part->mcdi.fw_subtype = fw_subtype_list[part->mcdi.nvram_type];
+
+	return 0;
+}
+
+static int siena_mtd_probe(struct efx_nic *efx)
+{
+	struct efx_mtd *efx_mtd;
+	int rc = -ENODEV;
+	u32 nvram_types;
+	unsigned int type;
+
+	ASSERT_RTNL();
+
+	rc = efx_mcdi_nvram_types(efx, &nvram_types);
+	if (rc)
+		return rc;
+
+	efx_mtd = kzalloc(sizeof(*efx_mtd) +
+			  hweight32(nvram_types) * sizeof(efx_mtd->part[0]),
+			  GFP_KERNEL);
+	if (!efx_mtd)
+		return -ENOMEM;
+
+	efx_mtd->name = "Siena NVRAM manager";
+
+	efx_mtd->ops = &siena_mtd_ops;
+
+	type = 0;
+	efx_mtd->n_parts = 0;
+
+	while (nvram_types != 0) {
+		if (nvram_types & 1) {
+			rc = siena_mtd_probe_partition(efx, efx_mtd,
+						       efx_mtd->n_parts, type);
+			if (rc == 0)
+				efx_mtd->n_parts++;
+			else if (rc != -ENODEV)
+				goto fail;
+		}
+		type++;
+		nvram_types >>= 1;
+	}
+
+	rc = siena_mtd_get_fw_subtypes(efx, efx_mtd);
+	if (rc)
+		goto fail;
+
+	rc = efx_mtd_probe_device(efx, efx_mtd);
+fail:
+	if (rc)
+		kfree(efx_mtd);
+	return rc;
+}
+