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authorLinus Torvalds <torvalds@linux-foundation.org>2016-07-27 12:03:20 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-27 12:03:20 -0700
commit468fc7ed5537615efe671d94248446ac24679773 (patch)
tree27bc9de792e863d6ec1630927b77ac9e7dabb38a /drivers/net/dsa/b53/b53_spi.c
parent08fd8c17686c6b09fa410a26d516548dd80ff147 (diff)
parent36232012344b8db67052432742deaf17f82e70e6 (diff)
downloadlinux-468fc7ed5537615efe671d94248446ac24679773.tar.bz2
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
Pull networking updates from David Miller: 1) Unified UDP encapsulation offload methods for drivers, from Alexander Duyck. 2) Make DSA binding more sane, from Andrew Lunn. 3) Support QCA9888 chips in ath10k, from Anilkumar Kolli. 4) Several workqueue usage cleanups, from Bhaktipriya Shridhar. 5) Add XDP (eXpress Data Path), essentially running BPF programs on RX packets as soon as the device sees them, with the option to mirror the packet on TX via the same interface. From Brenden Blanco and others. 6) Allow qdisc/class stats dumps to run lockless, from Eric Dumazet. 7) Add VLAN support to b53 and bcm_sf2, from Florian Fainelli. 8) Simplify netlink conntrack entry layout, from Florian Westphal. 9) Add ipv4 forwarding support to mlxsw spectrum driver, from Ido Schimmel, Yotam Gigi, and Jiri Pirko. 10) Add SKB array infrastructure and convert tun and macvtap over to it. From Michael S Tsirkin and Jason Wang. 11) Support qdisc packet injection in pktgen, from John Fastabend. 12) Add neighbour monitoring framework to TIPC, from Jon Paul Maloy. 13) Add NV congestion control support to TCP, from Lawrence Brakmo. 14) Add GSO support to SCTP, from Marcelo Ricardo Leitner. 15) Allow GRO and RPS to function on macsec devices, from Paolo Abeni. 16) Support MPLS over IPV4, from Simon Horman. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1622 commits) xgene: Fix build warning with ACPI disabled. be2net: perform temperature query in adapter regardless of its interface state l2tp: Correctly return -EBADF from pppol2tp_getname. net/mlx5_core/health: Remove deprecated create_singlethread_workqueue net: ipmr/ip6mr: update lastuse on entry change macsec: ensure rx_sa is set when validation is disabled tipc: dump monitor attributes tipc: add a function to get the bearer name tipc: get monitor threshold for the cluster tipc: make cluster size threshold for monitoring configurable tipc: introduce constants for tipc address validation net: neigh: disallow transition to NUD_STALE if lladdr is unchanged in neigh_update() MAINTAINERS: xgene: Add driver and documentation path Documentation: dtb: xgene: Add MDIO node dtb: xgene: Add MDIO node drivers: net: xgene: ethtool: Use phy_ethtool_gset and sset drivers: net: xgene: Use exported functions drivers: net: xgene: Enable MDIO driver drivers: net: xgene: Add backward compatibility drivers: net: phy: xgene: Add MDIO driver ...
Diffstat (limited to 'drivers/net/dsa/b53/b53_spi.c')
-rw-r--r--drivers/net/dsa/b53/b53_spi.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/drivers/net/dsa/b53/b53_spi.c b/drivers/net/dsa/b53/b53_spi.c
new file mode 100644
index 000000000000..2bda0b5f1578
--- /dev/null
+++ b/drivers/net/dsa/b53/b53_spi.c
@@ -0,0 +1,331 @@
+/*
+ * B53 register access through SPI
+ *
+ * Copyright (C) 2011-2013 Jonas Gorski <jogo@openwrt.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <asm/unaligned.h>
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/platform_data/b53.h>
+
+#include "b53_priv.h"
+
+#define B53_SPI_DATA 0xf0
+
+#define B53_SPI_STATUS 0xfe
+#define B53_SPI_CMD_SPIF BIT(7)
+#define B53_SPI_CMD_RACK BIT(5)
+
+#define B53_SPI_CMD_READ 0x00
+#define B53_SPI_CMD_WRITE 0x01
+#define B53_SPI_CMD_NORMAL 0x60
+#define B53_SPI_CMD_FAST 0x10
+
+#define B53_SPI_PAGE_SELECT 0xff
+
+static inline int b53_spi_read_reg(struct spi_device *spi, u8 reg, u8 *val,
+ unsigned int len)
+{
+ u8 txbuf[2];
+
+ txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_READ;
+ txbuf[1] = reg;
+
+ return spi_write_then_read(spi, txbuf, 2, val, len);
+}
+
+static inline int b53_spi_clear_status(struct spi_device *spi)
+{
+ unsigned int i;
+ u8 rxbuf;
+ int ret;
+
+ for (i = 0; i < 10; i++) {
+ ret = b53_spi_read_reg(spi, B53_SPI_STATUS, &rxbuf, 1);
+ if (ret)
+ return ret;
+
+ if (!(rxbuf & B53_SPI_CMD_SPIF))
+ break;
+
+ mdelay(1);
+ }
+
+ if (i == 10)
+ return -EIO;
+
+ return 0;
+}
+
+static inline int b53_spi_set_page(struct spi_device *spi, u8 page)
+{
+ u8 txbuf[3];
+
+ txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
+ txbuf[1] = B53_SPI_PAGE_SELECT;
+ txbuf[2] = page;
+
+ return spi_write(spi, txbuf, sizeof(txbuf));
+}
+
+static inline int b53_prepare_reg_access(struct spi_device *spi, u8 page)
+{
+ int ret = b53_spi_clear_status(spi);
+
+ if (ret)
+ return ret;
+
+ return b53_spi_set_page(spi, page);
+}
+
+static int b53_spi_prepare_reg_read(struct spi_device *spi, u8 reg)
+{
+ u8 rxbuf;
+ int retry_count;
+ int ret;
+
+ ret = b53_spi_read_reg(spi, reg, &rxbuf, 1);
+ if (ret)
+ return ret;
+
+ for (retry_count = 0; retry_count < 10; retry_count++) {
+ ret = b53_spi_read_reg(spi, B53_SPI_STATUS, &rxbuf, 1);
+ if (ret)
+ return ret;
+
+ if (rxbuf & B53_SPI_CMD_RACK)
+ break;
+
+ mdelay(1);
+ }
+
+ if (retry_count == 10)
+ return -EIO;
+
+ return 0;
+}
+
+static int b53_spi_read(struct b53_device *dev, u8 page, u8 reg, u8 *data,
+ unsigned int len)
+{
+ struct spi_device *spi = dev->priv;
+ int ret;
+
+ ret = b53_prepare_reg_access(spi, page);
+ if (ret)
+ return ret;
+
+ ret = b53_spi_prepare_reg_read(spi, reg);
+ if (ret)
+ return ret;
+
+ return b53_spi_read_reg(spi, B53_SPI_DATA, data, len);
+}
+
+static int b53_spi_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
+{
+ return b53_spi_read(dev, page, reg, val, 1);
+}
+
+static int b53_spi_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
+{
+ int ret = b53_spi_read(dev, page, reg, (u8 *)val, 2);
+
+ if (!ret)
+ *val = le16_to_cpu(*val);
+
+ return ret;
+}
+
+static int b53_spi_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
+{
+ int ret = b53_spi_read(dev, page, reg, (u8 *)val, 4);
+
+ if (!ret)
+ *val = le32_to_cpu(*val);
+
+ return ret;
+}
+
+static int b53_spi_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
+{
+ int ret;
+
+ *val = 0;
+ ret = b53_spi_read(dev, page, reg, (u8 *)val, 6);
+ if (!ret)
+ *val = le64_to_cpu(*val);
+
+ return ret;
+}
+
+static int b53_spi_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
+{
+ int ret = b53_spi_read(dev, page, reg, (u8 *)val, 8);
+
+ if (!ret)
+ *val = le64_to_cpu(*val);
+
+ return ret;
+}
+
+static int b53_spi_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
+{
+ struct spi_device *spi = dev->priv;
+ int ret;
+ u8 txbuf[3];
+
+ ret = b53_prepare_reg_access(spi, page);
+ if (ret)
+ return ret;
+
+ txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
+ txbuf[1] = reg;
+ txbuf[2] = value;
+
+ return spi_write(spi, txbuf, sizeof(txbuf));
+}
+
+static int b53_spi_write16(struct b53_device *dev, u8 page, u8 reg, u16 value)
+{
+ struct spi_device *spi = dev->priv;
+ int ret;
+ u8 txbuf[4];
+
+ ret = b53_prepare_reg_access(spi, page);
+ if (ret)
+ return ret;
+
+ txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
+ txbuf[1] = reg;
+ put_unaligned_le16(value, &txbuf[2]);
+
+ return spi_write(spi, txbuf, sizeof(txbuf));
+}
+
+static int b53_spi_write32(struct b53_device *dev, u8 page, u8 reg, u32 value)
+{
+ struct spi_device *spi = dev->priv;
+ int ret;
+ u8 txbuf[6];
+
+ ret = b53_prepare_reg_access(spi, page);
+ if (ret)
+ return ret;
+
+ txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
+ txbuf[1] = reg;
+ put_unaligned_le32(value, &txbuf[2]);
+
+ return spi_write(spi, txbuf, sizeof(txbuf));
+}
+
+static int b53_spi_write48(struct b53_device *dev, u8 page, u8 reg, u64 value)
+{
+ struct spi_device *spi = dev->priv;
+ int ret;
+ u8 txbuf[10];
+
+ ret = b53_prepare_reg_access(spi, page);
+ if (ret)
+ return ret;
+
+ txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
+ txbuf[1] = reg;
+ put_unaligned_le64(value, &txbuf[2]);
+
+ return spi_write(spi, txbuf, sizeof(txbuf) - 2);
+}
+
+static int b53_spi_write64(struct b53_device *dev, u8 page, u8 reg, u64 value)
+{
+ struct spi_device *spi = dev->priv;
+ int ret;
+ u8 txbuf[10];
+
+ ret = b53_prepare_reg_access(spi, page);
+ if (ret)
+ return ret;
+
+ txbuf[0] = B53_SPI_CMD_NORMAL | B53_SPI_CMD_WRITE;
+ txbuf[1] = reg;
+ put_unaligned_le64(value, &txbuf[2]);
+
+ return spi_write(spi, txbuf, sizeof(txbuf));
+}
+
+static struct b53_io_ops b53_spi_ops = {
+ .read8 = b53_spi_read8,
+ .read16 = b53_spi_read16,
+ .read32 = b53_spi_read32,
+ .read48 = b53_spi_read48,
+ .read64 = b53_spi_read64,
+ .write8 = b53_spi_write8,
+ .write16 = b53_spi_write16,
+ .write32 = b53_spi_write32,
+ .write48 = b53_spi_write48,
+ .write64 = b53_spi_write64,
+};
+
+static int b53_spi_probe(struct spi_device *spi)
+{
+ struct b53_device *dev;
+ int ret;
+
+ dev = b53_switch_alloc(&spi->dev, &b53_spi_ops, spi);
+ if (!dev)
+ return -ENOMEM;
+
+ if (spi->dev.platform_data)
+ dev->pdata = spi->dev.platform_data;
+
+ ret = b53_switch_register(dev);
+ if (ret)
+ return ret;
+
+ spi_set_drvdata(spi, dev);
+
+ return 0;
+}
+
+static int b53_spi_remove(struct spi_device *spi)
+{
+ struct b53_device *dev = spi_get_drvdata(spi);
+
+ if (dev)
+ b53_switch_remove(dev);
+
+ return 0;
+}
+
+static struct spi_driver b53_spi_driver = {
+ .driver = {
+ .name = "b53-switch",
+ .bus = &spi_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = b53_spi_probe,
+ .remove = b53_spi_remove,
+};
+
+module_spi_driver(b53_spi_driver);
+
+MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
+MODULE_DESCRIPTION("B53 SPI access driver");
+MODULE_LICENSE("Dual BSD/GPL");