850 lines
22 KiB
Diff
850 lines
22 KiB
Diff
From: Andreas Noever <andreas.noever@gmail.com>
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Date: Tue, 3 Jun 2014 22:03:59 +0200
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Subject: [02/31] thunderbolt: Add control channel interface
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Origin: https://git.kernel.org/linus/f25bf6fcb1a83a149bc8b5285d33b48cbd47c7d7
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Thunderbolt devices are configured by reading/writing into their
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configuration space (similar to pci). This is done by sending packets
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through the NHI (native host interface) onto the control channel.
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This patch handles the low level packet based protocol and exposes
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higher level operations like tb_cfg_read/tb_cfg_write.
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Signed-off-by: Andreas Noever <andreas.noever@gmail.com>
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/thunderbolt/Makefile | 2 +-
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drivers/thunderbolt/ctl.c | 731 +++++++++++++++++++++++++++++++++++++++++++
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drivers/thunderbolt/ctl.h | 75 +++++
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3 files changed, 807 insertions(+), 1 deletion(-)
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create mode 100644 drivers/thunderbolt/ctl.c
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create mode 100644 drivers/thunderbolt/ctl.h
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diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile
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index d473ab9..4b21c99 100644
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--- a/drivers/thunderbolt/Makefile
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+++ b/drivers/thunderbolt/Makefile
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@@ -1,3 +1,3 @@
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obj-${CONFIG_THUNDERBOLT} := thunderbolt.o
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-thunderbolt-objs := nhi.o
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+thunderbolt-objs := nhi.o ctl.o
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diff --git a/drivers/thunderbolt/ctl.c b/drivers/thunderbolt/ctl.c
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new file mode 100644
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index 0000000..9b0120b
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--- /dev/null
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+++ b/drivers/thunderbolt/ctl.c
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@@ -0,0 +1,731 @@
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+/*
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+ * Thunderbolt Cactus Ridge driver - control channel and configuration commands
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+ *
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+ * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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+ */
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+
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+#include <linux/crc32.h>
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+#include <linux/slab.h>
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+#include <linux/pci.h>
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+#include <linux/dmapool.h>
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+#include <linux/workqueue.h>
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+#include <linux/kfifo.h>
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+
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+#include "ctl.h"
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+
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+
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+struct ctl_pkg {
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+ struct tb_ctl *ctl;
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+ void *buffer;
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+ struct ring_frame frame;
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+};
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+
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+#define TB_CTL_RX_PKG_COUNT 10
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+
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+/**
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+ * struct tb_cfg - thunderbolt control channel
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+ */
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+struct tb_ctl {
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+ struct tb_nhi *nhi;
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+ struct tb_ring *tx;
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+ struct tb_ring *rx;
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+
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+ struct dma_pool *frame_pool;
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+ struct ctl_pkg *rx_packets[TB_CTL_RX_PKG_COUNT];
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+ DECLARE_KFIFO(response_fifo, struct ctl_pkg*, 16);
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+ struct completion response_ready;
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+
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+ hotplug_cb callback;
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+ void *callback_data;
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+};
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+
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+
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+#define tb_ctl_WARN(ctl, format, arg...) \
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+ dev_WARN(&(ctl)->nhi->pdev->dev, format, ## arg)
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+
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+#define tb_ctl_err(ctl, format, arg...) \
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+ dev_err(&(ctl)->nhi->pdev->dev, format, ## arg)
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+
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+#define tb_ctl_warn(ctl, format, arg...) \
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+ dev_warn(&(ctl)->nhi->pdev->dev, format, ## arg)
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+
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+#define tb_ctl_info(ctl, format, arg...) \
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+ dev_info(&(ctl)->nhi->pdev->dev, format, ## arg)
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+
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+
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+/* configuration packets definitions */
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+
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+enum tb_cfg_pkg_type {
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+ TB_CFG_PKG_READ = 1,
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+ TB_CFG_PKG_WRITE = 2,
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+ TB_CFG_PKG_ERROR = 3,
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+ TB_CFG_PKG_NOTIFY_ACK = 4,
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+ TB_CFG_PKG_EVENT = 5,
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+ TB_CFG_PKG_XDOMAIN_REQ = 6,
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+ TB_CFG_PKG_XDOMAIN_RESP = 7,
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+ TB_CFG_PKG_OVERRIDE = 8,
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+ TB_CFG_PKG_RESET = 9,
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+ TB_CFG_PKG_PREPARE_TO_SLEEP = 0xd,
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+};
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+
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+/* common header */
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+struct tb_cfg_header {
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+ u32 route_hi:22;
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+ u32 unknown:10; /* highest order bit is set on replies */
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+ u32 route_lo;
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+} __packed;
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+
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+/* additional header for read/write packets */
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+struct tb_cfg_address {
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+ u32 offset:13; /* in dwords */
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+ u32 length:6; /* in dwords */
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+ u32 port:6;
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+ enum tb_cfg_space space:2;
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+ u32 seq:2; /* sequence number */
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+ u32 zero:3;
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+} __packed;
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+
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+/* TB_CFG_PKG_READ, response for TB_CFG_PKG_WRITE */
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+struct cfg_read_pkg {
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+ struct tb_cfg_header header;
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+ struct tb_cfg_address addr;
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+} __packed;
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+
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+/* TB_CFG_PKG_WRITE, response for TB_CFG_PKG_READ */
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+struct cfg_write_pkg {
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+ struct tb_cfg_header header;
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+ struct tb_cfg_address addr;
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+ u32 data[64]; /* maximum size, tb_cfg_address.length has 6 bits */
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+} __packed;
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+
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+/* TB_CFG_PKG_ERROR */
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+struct cfg_error_pkg {
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+ struct tb_cfg_header header;
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+ enum tb_cfg_error error:4;
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+ u32 zero1:4;
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+ u32 port:6;
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+ u32 zero2:2; /* Both should be zero, still they are different fields. */
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+ u32 zero3:16;
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+} __packed;
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+
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+/* TB_CFG_PKG_EVENT */
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+struct cfg_event_pkg {
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+ struct tb_cfg_header header;
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+ u32 port:6;
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+ u32 zero:25;
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+ bool unplug:1;
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+} __packed;
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+
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+/* TB_CFG_PKG_RESET */
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+struct cfg_reset_pkg {
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+ struct tb_cfg_header header;
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+} __packed;
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+
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+/* TB_CFG_PKG_PREPARE_TO_SLEEP */
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+struct cfg_pts_pkg {
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+ struct tb_cfg_header header;
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+ u32 data;
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+} __packed;
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+
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+
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+/* utility functions */
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+
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+static u64 get_route(struct tb_cfg_header header)
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+{
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+ return (u64) header.route_hi << 32 | header.route_lo;
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+}
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+
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+static struct tb_cfg_header make_header(u64 route)
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+{
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+ struct tb_cfg_header header = {
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+ .route_hi = route >> 32,
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+ .route_lo = route,
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+ };
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+ /* check for overflow, route_hi is not 32 bits! */
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+ WARN_ON(get_route(header) != route);
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+ return header;
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+}
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+
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+static int check_header(struct ctl_pkg *pkg, u32 len, enum tb_cfg_pkg_type type,
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+ u64 route)
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+{
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+ struct tb_cfg_header *header = pkg->buffer;
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+
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+ /* check frame, TODO: frame flags */
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+ if (WARN(len != pkg->frame.size,
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+ "wrong framesize (expected %#x, got %#x)\n",
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+ len, pkg->frame.size))
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+ return -EIO;
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+ if (WARN(type != pkg->frame.eof, "wrong eof (expected %#x, got %#x)\n",
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+ type, pkg->frame.eof))
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+ return -EIO;
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+ if (WARN(pkg->frame.sof, "wrong sof (expected 0x0, got %#x)\n",
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+ pkg->frame.sof))
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+ return -EIO;
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+
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+ /* check header */
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+ if (WARN(header->unknown != 1 << 9,
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+ "header->unknown is %#x\n", header->unknown))
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+ return -EIO;
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+ if (WARN(route != get_route(*header),
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+ "wrong route (expected %llx, got %llx)",
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+ route, get_route(*header)))
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+ return -EIO;
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+ return 0;
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+}
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+
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+static int check_config_address(struct tb_cfg_address addr,
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+ enum tb_cfg_space space, u32 offset,
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+ u32 length)
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+{
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+ if (WARN(addr.zero, "addr.zero is %#x\n", addr.zero))
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+ return -EIO;
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+ if (WARN(space != addr.space, "wrong space (expected %x, got %x\n)",
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+ space, addr.space))
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+ return -EIO;
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+ if (WARN(offset != addr.offset, "wrong offset (expected %x, got %x\n)",
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+ offset, addr.offset))
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+ return -EIO;
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+ if (WARN(length != addr.length, "wrong space (expected %x, got %x\n)",
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+ length, addr.length))
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+ return -EIO;
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+ if (WARN(addr.seq, "addr.seq is %#x\n", addr.seq))
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+ return -EIO;
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+ /*
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+ * We cannot check addr->port as it is set to the upstream port of the
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+ * sender.
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+ */
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+ return 0;
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+}
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+
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+static struct tb_cfg_result decode_error(struct ctl_pkg *response)
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+{
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+ struct cfg_error_pkg *pkg = response->buffer;
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+ struct tb_cfg_result res = { 0 };
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+ res.response_route = get_route(pkg->header);
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+ res.response_port = 0;
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+ res.err = check_header(response, sizeof(*pkg), TB_CFG_PKG_ERROR,
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+ get_route(pkg->header));
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+ if (res.err)
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+ return res;
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+
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+ WARN(pkg->zero1, "pkg->zero1 is %#x\n", pkg->zero1);
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+ WARN(pkg->zero2, "pkg->zero1 is %#x\n", pkg->zero1);
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+ WARN(pkg->zero3, "pkg->zero1 is %#x\n", pkg->zero1);
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+ res.err = 1;
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+ res.tb_error = pkg->error;
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+ res.response_port = pkg->port;
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+ return res;
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+
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+}
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+
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+static struct tb_cfg_result parse_header(struct ctl_pkg *pkg, u32 len,
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+ enum tb_cfg_pkg_type type, u64 route)
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+{
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+ struct tb_cfg_header *header = pkg->buffer;
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+ struct tb_cfg_result res = { 0 };
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+
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+ if (pkg->frame.eof == TB_CFG_PKG_ERROR)
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+ return decode_error(pkg);
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+
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+ res.response_port = 0; /* will be updated later for cfg_read/write */
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+ res.response_route = get_route(*header);
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+ res.err = check_header(pkg, len, type, route);
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+ return res;
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+}
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+
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+static void tb_cfg_print_error(struct tb_ctl *ctl,
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+ const struct tb_cfg_result *res)
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+{
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+ WARN_ON(res->err != 1);
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+ switch (res->tb_error) {
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+ case TB_CFG_ERROR_PORT_NOT_CONNECTED:
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+ /* Port is not connected. This can happen during surprise
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+ * removal. Do not warn. */
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+ return;
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+ case TB_CFG_ERROR_INVALID_CONFIG_SPACE:
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+ /*
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+ * Invalid cfg_space/offset/length combination in
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+ * cfg_read/cfg_write.
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+ */
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+ tb_ctl_WARN(ctl,
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+ "CFG_ERROR(%llx:%x): Invalid config space of offset\n",
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+ res->response_route, res->response_port);
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+ return;
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+ case TB_CFG_ERROR_NO_SUCH_PORT:
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+ /*
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+ * - The route contains a non-existent port.
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+ * - The route contains a non-PHY port (e.g. PCIe).
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+ * - The port in cfg_read/cfg_write does not exist.
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+ */
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+ tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Invalid port\n",
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+ res->response_route, res->response_port);
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+ return;
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+ case TB_CFG_ERROR_LOOP:
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+ tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Route contains a loop\n",
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+ res->response_route, res->response_port);
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+ return;
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+ default:
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+ /* 5,6,7,9 and 11 are also valid error codes */
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+ tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Unknown error\n",
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+ res->response_route, res->response_port);
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+ return;
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+ }
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+}
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+
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+static void cpu_to_be32_array(__be32 *dst, u32 *src, size_t len)
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+{
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+ int i;
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+ for (i = 0; i < len; i++)
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+ dst[i] = cpu_to_be32(src[i]);
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+}
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+
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+static void be32_to_cpu_array(u32 *dst, __be32 *src, size_t len)
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+{
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+ int i;
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+ for (i = 0; i < len; i++)
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+ dst[i] = be32_to_cpu(src[i]);
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+}
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+
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+static __be32 tb_crc(void *data, size_t len)
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+{
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+ return cpu_to_be32(~__crc32c_le(~0, data, len));
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+}
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+
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+static void tb_ctl_pkg_free(struct ctl_pkg *pkg)
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+{
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+ if (pkg) {
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+ dma_pool_free(pkg->ctl->frame_pool,
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+ pkg->buffer, pkg->frame.buffer_phy);
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+ kfree(pkg);
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+ }
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+}
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+
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+static struct ctl_pkg *tb_ctl_pkg_alloc(struct tb_ctl *ctl)
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+{
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+ struct ctl_pkg *pkg = kzalloc(sizeof(*pkg), GFP_KERNEL);
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+ if (!pkg)
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+ return 0;
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+ pkg->ctl = ctl;
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+ pkg->buffer = dma_pool_alloc(ctl->frame_pool, GFP_KERNEL,
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+ &pkg->frame.buffer_phy);
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+ if (!pkg->buffer) {
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+ kfree(pkg);
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+ return 0;
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+ }
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+ return pkg;
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+}
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+
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+
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+/* RX/TX handling */
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+
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+static void tb_ctl_tx_callback(struct tb_ring *ring, struct ring_frame *frame,
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+ bool canceled)
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+{
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+ struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame);
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+ tb_ctl_pkg_free(pkg);
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+}
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+
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+/**
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+ * tb_cfg_tx() - transmit a packet on the control channel
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+ *
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+ * len must be a multiple of four.
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+ *
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+ * Return: Returns 0 on success or an error code on failure.
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+ */
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+static int tb_ctl_tx(struct tb_ctl *ctl, void *data, size_t len,
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+ enum tb_cfg_pkg_type type)
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+{
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+ int res;
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+ struct ctl_pkg *pkg;
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+ if (len % 4 != 0) { /* required for le->be conversion */
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+ tb_ctl_WARN(ctl, "TX: invalid size: %zu\n", len);
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+ return -EINVAL;
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+ }
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+ if (len > TB_FRAME_SIZE - 4) { /* checksum is 4 bytes */
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+ tb_ctl_WARN(ctl, "TX: packet too large: %zu/%d\n",
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+ len, TB_FRAME_SIZE - 4);
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+ return -EINVAL;
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+ }
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+ pkg = tb_ctl_pkg_alloc(ctl);
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+ if (!pkg)
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+ return -ENOMEM;
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+ pkg->frame.callback = tb_ctl_tx_callback;
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+ pkg->frame.size = len + 4;
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+ pkg->frame.sof = type;
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+ pkg->frame.eof = type;
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+ cpu_to_be32_array(pkg->buffer, data, len / 4);
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+ *(u32 *) (pkg->buffer + len) = tb_crc(pkg->buffer, len);
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+
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+ res = ring_tx(ctl->tx, &pkg->frame);
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+ if (res) /* ring is stopped */
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+ tb_ctl_pkg_free(pkg);
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+ return res;
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+}
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+
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+/**
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+ * tb_ctl_handle_plug_event() - acknowledge a plug event, invoke ctl->callback
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+ */
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+static void tb_ctl_handle_plug_event(struct tb_ctl *ctl,
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+ struct ctl_pkg *response)
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+{
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+ struct cfg_event_pkg *pkg = response->buffer;
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+ u64 route = get_route(pkg->header);
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+
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+ if (check_header(response, sizeof(*pkg), TB_CFG_PKG_EVENT, route)) {
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+ tb_ctl_warn(ctl, "malformed TB_CFG_PKG_EVENT\n");
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+ return;
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+ }
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+
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+ if (tb_cfg_error(ctl, route, pkg->port, TB_CFG_ERROR_ACK_PLUG_EVENT))
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+ tb_ctl_warn(ctl, "could not ack plug event on %llx:%x\n",
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+ route, pkg->port);
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+ WARN(pkg->zero, "pkg->zero is %#x\n", pkg->zero);
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+ ctl->callback(ctl->callback_data, route, pkg->port, pkg->unplug);
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+}
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+
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+static void tb_ctl_rx_submit(struct ctl_pkg *pkg)
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+{
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+ ring_rx(pkg->ctl->rx, &pkg->frame); /*
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+ * We ignore failures during stop.
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+ * All rx packets are referenced
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+ * from ctl->rx_packets, so we do
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+ * not loose them.
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+ */
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+}
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+
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+static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame,
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+ bool canceled)
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+{
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+ struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame);
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+
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+ if (canceled)
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+ return; /*
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+ * ring is stopped, packet is referenced from
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+ * ctl->rx_packets.
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+ */
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+
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+ if (frame->size < 4 || frame->size % 4 != 0) {
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+ tb_ctl_err(pkg->ctl, "RX: invalid size %#x, dropping packet\n",
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+ frame->size);
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+ goto rx;
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+ }
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+
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+ frame->size -= 4; /* remove checksum */
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+ if (*(u32 *) (pkg->buffer + frame->size)
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+ != tb_crc(pkg->buffer, frame->size)) {
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+ tb_ctl_err(pkg->ctl,
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+ "RX: checksum mismatch, dropping packet\n");
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+ goto rx;
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+ }
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+ be32_to_cpu_array(pkg->buffer, pkg->buffer, frame->size / 4);
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+
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+ if (frame->eof == TB_CFG_PKG_EVENT) {
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+ tb_ctl_handle_plug_event(pkg->ctl, pkg);
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+ goto rx;
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+ }
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+ if (!kfifo_put(&pkg->ctl->response_fifo, pkg)) {
|
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+ tb_ctl_err(pkg->ctl, "RX: fifo is full\n");
|
|
+ goto rx;
|
|
+ }
|
|
+ complete(&pkg->ctl->response_ready);
|
|
+ return;
|
|
+rx:
|
|
+ tb_ctl_rx_submit(pkg);
|
|
+}
|
|
+
|
|
+/**
|
|
+ * tb_ctl_rx() - receive a packet from the control channel
|
|
+ */
|
|
+static struct tb_cfg_result tb_ctl_rx(struct tb_ctl *ctl, void *buffer,
|
|
+ size_t length, int timeout_msec,
|
|
+ u8 route, enum tb_cfg_pkg_type type)
|
|
+{
|
|
+ struct tb_cfg_result res;
|
|
+ struct ctl_pkg *pkg;
|
|
+
|
|
+ if (!wait_for_completion_timeout(&ctl->response_ready,
|
|
+ msecs_to_jiffies(timeout_msec))) {
|
|
+ tb_ctl_WARN(ctl, "RX: timeout\n");
|
|
+ return (struct tb_cfg_result) { .err = -ETIMEDOUT };
|
|
+ }
|
|
+ if (!kfifo_get(&ctl->response_fifo, &pkg)) {
|
|
+ tb_ctl_WARN(ctl, "empty kfifo\n");
|
|
+ return (struct tb_cfg_result) { .err = -EIO };
|
|
+ }
|
|
+
|
|
+ res = parse_header(pkg, length, type, route);
|
|
+ if (!res.err)
|
|
+ memcpy(buffer, pkg->buffer, length);
|
|
+ tb_ctl_rx_submit(pkg);
|
|
+ return res;
|
|
+}
|
|
+
|
|
+
|
|
+/* public interface, alloc/start/stop/free */
|
|
+
|
|
+/**
|
|
+ * tb_ctl_alloc() - allocate a control channel
|
|
+ *
|
|
+ * cb will be invoked once for every hot plug event.
|
|
+ *
|
|
+ * Return: Returns a pointer on success or NULL on failure.
|
|
+ */
|
|
+struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, hotplug_cb cb, void *cb_data)
|
|
+{
|
|
+ int i;
|
|
+ struct tb_ctl *ctl = kzalloc(sizeof(*ctl), GFP_KERNEL);
|
|
+ if (!ctl)
|
|
+ return NULL;
|
|
+ ctl->nhi = nhi;
|
|
+ ctl->callback = cb;
|
|
+ ctl->callback_data = cb_data;
|
|
+
|
|
+ init_completion(&ctl->response_ready);
|
|
+ INIT_KFIFO(ctl->response_fifo);
|
|
+ ctl->frame_pool = dma_pool_create("thunderbolt_ctl", &nhi->pdev->dev,
|
|
+ TB_FRAME_SIZE, 4, 0);
|
|
+ if (!ctl->frame_pool)
|
|
+ goto err;
|
|
+
|
|
+ ctl->tx = ring_alloc_tx(nhi, 0, 10);
|
|
+ if (!ctl->tx)
|
|
+ goto err;
|
|
+
|
|
+ ctl->rx = ring_alloc_rx(nhi, 0, 10);
|
|
+ if (!ctl->rx)
|
|
+ goto err;
|
|
+
|
|
+ for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++) {
|
|
+ ctl->rx_packets[i] = tb_ctl_pkg_alloc(ctl);
|
|
+ if (!ctl->rx_packets[i])
|
|
+ goto err;
|
|
+ ctl->rx_packets[i]->frame.callback = tb_ctl_rx_callback;
|
|
+ }
|
|
+
|
|
+ tb_ctl_info(ctl, "control channel created\n");
|
|
+ return ctl;
|
|
+err:
|
|
+ tb_ctl_free(ctl);
|
|
+ return NULL;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * tb_ctl_free() - free a control channel
|
|
+ *
|
|
+ * Must be called after tb_ctl_stop.
|
|
+ *
|
|
+ * Must NOT be called from ctl->callback.
|
|
+ */
|
|
+void tb_ctl_free(struct tb_ctl *ctl)
|
|
+{
|
|
+ int i;
|
|
+ if (ctl->rx)
|
|
+ ring_free(ctl->rx);
|
|
+ if (ctl->tx)
|
|
+ ring_free(ctl->tx);
|
|
+
|
|
+ /* free RX packets */
|
|
+ for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++)
|
|
+ tb_ctl_pkg_free(ctl->rx_packets[i]);
|
|
+
|
|
+
|
|
+ if (ctl->frame_pool)
|
|
+ dma_pool_destroy(ctl->frame_pool);
|
|
+ kfree(ctl);
|
|
+}
|
|
+
|
|
+/**
|
|
+ * tb_cfg_start() - start/resume the control channel
|
|
+ */
|
|
+void tb_ctl_start(struct tb_ctl *ctl)
|
|
+{
|
|
+ int i;
|
|
+ tb_ctl_info(ctl, "control channel starting...\n");
|
|
+ ring_start(ctl->tx); /* is used to ack hotplug packets, start first */
|
|
+ ring_start(ctl->rx);
|
|
+ for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++)
|
|
+ tb_ctl_rx_submit(ctl->rx_packets[i]);
|
|
+}
|
|
+
|
|
+/**
|
|
+ * control() - pause the control channel
|
|
+ *
|
|
+ * All invocations of ctl->callback will have finished after this method
|
|
+ * returns.
|
|
+ *
|
|
+ * Must NOT be called from ctl->callback.
|
|
+ */
|
|
+void tb_ctl_stop(struct tb_ctl *ctl)
|
|
+{
|
|
+ ring_stop(ctl->rx);
|
|
+ ring_stop(ctl->tx);
|
|
+
|
|
+ if (!kfifo_is_empty(&ctl->response_fifo))
|
|
+ tb_ctl_WARN(ctl, "dangling response in response_fifo\n");
|
|
+ kfifo_reset(&ctl->response_fifo);
|
|
+ tb_ctl_info(ctl, "control channel stopped\n");
|
|
+}
|
|
+
|
|
+/* public interface, commands */
|
|
+
|
|
+/**
|
|
+ * tb_cfg_error() - send error packet
|
|
+ *
|
|
+ * Return: Returns 0 on success or an error code on failure.
|
|
+ */
|
|
+int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port,
|
|
+ enum tb_cfg_error error)
|
|
+{
|
|
+ struct cfg_error_pkg pkg = {
|
|
+ .header = make_header(route),
|
|
+ .port = port,
|
|
+ .error = error,
|
|
+ };
|
|
+ tb_ctl_info(ctl, "resetting error on %llx:%x.\n", route, port);
|
|
+ return tb_ctl_tx(ctl, &pkg, sizeof(pkg), TB_CFG_PKG_ERROR);
|
|
+}
|
|
+
|
|
+/**
|
|
+ * tb_cfg_reset() - send a reset packet and wait for a response
|
|
+ *
|
|
+ * If the switch at route is incorrectly configured then we will not receive a
|
|
+ * reply (even though the switch will reset). The caller should check for
|
|
+ * -ETIMEDOUT and attempt to reconfigure the switch.
|
|
+ */
|
|
+struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
|
|
+ int timeout_msec)
|
|
+{
|
|
+ int err;
|
|
+ struct cfg_reset_pkg request = { .header = make_header(route) };
|
|
+ struct tb_cfg_header reply;
|
|
+
|
|
+ err = tb_ctl_tx(ctl, &request, sizeof(request), TB_CFG_PKG_RESET);
|
|
+ if (err)
|
|
+ return (struct tb_cfg_result) { .err = err };
|
|
+
|
|
+ return tb_ctl_rx(ctl, &reply, sizeof(reply), timeout_msec, route,
|
|
+ TB_CFG_PKG_RESET);
|
|
+}
|
|
+
|
|
+/**
|
|
+ * tb_cfg_read() - read from config space into buffer
|
|
+ *
|
|
+ * Offset and length are in dwords.
|
|
+ */
|
|
+struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,
|
|
+ u64 route, u32 port, enum tb_cfg_space space,
|
|
+ u32 offset, u32 length, int timeout_msec)
|
|
+{
|
|
+ struct tb_cfg_result res = { 0 };
|
|
+ struct cfg_read_pkg request = {
|
|
+ .header = make_header(route),
|
|
+ .addr = {
|
|
+ .port = port,
|
|
+ .space = space,
|
|
+ .offset = offset,
|
|
+ .length = length,
|
|
+ },
|
|
+ };
|
|
+ struct cfg_write_pkg reply;
|
|
+
|
|
+ res.err = tb_ctl_tx(ctl, &request, sizeof(request), TB_CFG_PKG_READ);
|
|
+ if (res.err)
|
|
+ return res;
|
|
+
|
|
+ res = tb_ctl_rx(ctl, &reply, 12 + 4 * length, timeout_msec, route,
|
|
+ TB_CFG_PKG_READ);
|
|
+ if (res.err)
|
|
+ return res;
|
|
+
|
|
+ res.response_port = reply.addr.port;
|
|
+ res.err = check_config_address(reply.addr, space, offset, length);
|
|
+ if (!res.err)
|
|
+ memcpy(buffer, &reply.data, 4 * length);
|
|
+ return res;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * tb_cfg_write() - write from buffer into config space
|
|
+ *
|
|
+ * Offset and length are in dwords.
|
|
+ */
|
|
+struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, void *buffer,
|
|
+ u64 route, u32 port, enum tb_cfg_space space,
|
|
+ u32 offset, u32 length, int timeout_msec)
|
|
+{
|
|
+ struct tb_cfg_result res = { 0 };
|
|
+ struct cfg_write_pkg request = {
|
|
+ .header = make_header(route),
|
|
+ .addr = {
|
|
+ .port = port,
|
|
+ .space = space,
|
|
+ .offset = offset,
|
|
+ .length = length,
|
|
+ },
|
|
+ };
|
|
+ struct cfg_read_pkg reply;
|
|
+
|
|
+ memcpy(&request.data, buffer, length * 4);
|
|
+
|
|
+ res.err = tb_ctl_tx(ctl, &request, 12 + 4 * length, TB_CFG_PKG_WRITE);
|
|
+ if (res.err)
|
|
+ return res;
|
|
+
|
|
+ res = tb_ctl_rx(ctl, &reply, sizeof(reply), timeout_msec, route,
|
|
+ TB_CFG_PKG_WRITE);
|
|
+ if (res.err)
|
|
+ return res;
|
|
+
|
|
+ res.response_port = reply.addr.port;
|
|
+ res.err = check_config_address(reply.addr, space, offset, length);
|
|
+ return res;
|
|
+}
|
|
+
|
|
+int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
|
|
+ enum tb_cfg_space space, u32 offset, u32 length)
|
|
+{
|
|
+ struct tb_cfg_result res = tb_cfg_read_raw(ctl, buffer, route, port,
|
|
+ space, offset, length, TB_CFG_DEFAULT_TIMEOUT);
|
|
+ if (res.err == 1) {
|
|
+ tb_cfg_print_error(ctl, &res);
|
|
+ return -EIO;
|
|
+ }
|
|
+ WARN(res.err, "tb_cfg_read: %d\n", res.err);
|
|
+ return res.err;
|
|
+}
|
|
+
|
|
+int tb_cfg_write(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
|
|
+ enum tb_cfg_space space, u32 offset, u32 length)
|
|
+{
|
|
+ struct tb_cfg_result res = tb_cfg_write_raw(ctl, buffer, route, port,
|
|
+ space, offset, length, TB_CFG_DEFAULT_TIMEOUT);
|
|
+ if (res.err == 1) {
|
|
+ tb_cfg_print_error(ctl, &res);
|
|
+ return -EIO;
|
|
+ }
|
|
+ WARN(res.err, "tb_cfg_write: %d\n", res.err);
|
|
+ return res.err;
|
|
+}
|
|
+
|
|
+/**
|
|
+ * tb_cfg_get_upstream_port() - get upstream port number of switch at route
|
|
+ *
|
|
+ * Reads the first dword from the switches TB_CFG_SWITCH config area and
|
|
+ * returns the port number from which the reply originated.
|
|
+ *
|
|
+ * Return: Returns the upstream port number on success or an error code on
|
|
+ * failure.
|
|
+ */
|
|
+int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route)
|
|
+{
|
|
+ u32 dummy;
|
|
+ struct tb_cfg_result res = tb_cfg_read_raw(ctl, &dummy, route, 0,
|
|
+ TB_CFG_SWITCH, 0, 1,
|
|
+ TB_CFG_DEFAULT_TIMEOUT);
|
|
+ if (res.err == 1)
|
|
+ return -EIO;
|
|
+ if (res.err)
|
|
+ return res.err;
|
|
+ return res.response_port;
|
|
+}
|
|
diff --git a/drivers/thunderbolt/ctl.h b/drivers/thunderbolt/ctl.h
|
|
new file mode 100644
|
|
index 0000000..ba87d6e
|
|
--- /dev/null
|
|
+++ b/drivers/thunderbolt/ctl.h
|
|
@@ -0,0 +1,75 @@
|
|
+/*
|
|
+ * Thunderbolt Cactus Ridge driver - control channel and configuration commands
|
|
+ *
|
|
+ * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
|
|
+ */
|
|
+
|
|
+#ifndef _TB_CFG
|
|
+#define _TB_CFG
|
|
+
|
|
+#include "nhi.h"
|
|
+
|
|
+/* control channel */
|
|
+struct tb_ctl;
|
|
+
|
|
+typedef void (*hotplug_cb)(void *data, u64 route, u8 port, bool unplug);
|
|
+
|
|
+struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, hotplug_cb cb, void *cb_data);
|
|
+void tb_ctl_start(struct tb_ctl *ctl);
|
|
+void tb_ctl_stop(struct tb_ctl *ctl);
|
|
+void tb_ctl_free(struct tb_ctl *ctl);
|
|
+
|
|
+/* configuration commands */
|
|
+
|
|
+#define TB_CFG_DEFAULT_TIMEOUT 5000 /* msec */
|
|
+
|
|
+enum tb_cfg_space {
|
|
+ TB_CFG_HOPS = 0,
|
|
+ TB_CFG_PORT = 1,
|
|
+ TB_CFG_SWITCH = 2,
|
|
+ TB_CFG_COUNTERS = 3,
|
|
+};
|
|
+
|
|
+enum tb_cfg_error {
|
|
+ TB_CFG_ERROR_PORT_NOT_CONNECTED = 0,
|
|
+ TB_CFG_ERROR_INVALID_CONFIG_SPACE = 2,
|
|
+ TB_CFG_ERROR_NO_SUCH_PORT = 4,
|
|
+ TB_CFG_ERROR_ACK_PLUG_EVENT = 7, /* send as reply to TB_CFG_PKG_EVENT */
|
|
+ TB_CFG_ERROR_LOOP = 8,
|
|
+};
|
|
+
|
|
+struct tb_cfg_result {
|
|
+ u64 response_route;
|
|
+ u32 response_port; /*
|
|
+ * If err = 1 then this is the port that send the
|
|
+ * error.
|
|
+ * If err = 0 and if this was a cfg_read/write then
|
|
+ * this is the the upstream port of the responding
|
|
+ * switch.
|
|
+ * Otherwise the field is set to zero.
|
|
+ */
|
|
+ int err; /* negative errors, 0 for success, 1 for tb errors */
|
|
+ enum tb_cfg_error tb_error; /* valid if err == 1 */
|
|
+};
|
|
+
|
|
+
|
|
+int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port,
|
|
+ enum tb_cfg_error error);
|
|
+struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
|
|
+ int timeout_msec);
|
|
+struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,
|
|
+ u64 route, u32 port,
|
|
+ enum tb_cfg_space space, u32 offset,
|
|
+ u32 length, int timeout_msec);
|
|
+struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, void *buffer,
|
|
+ u64 route, u32 port,
|
|
+ enum tb_cfg_space space, u32 offset,
|
|
+ u32 length, int timeout_msec);
|
|
+int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
|
|
+ enum tb_cfg_space space, u32 offset, u32 length);
|
|
+int tb_cfg_write(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
|
|
+ enum tb_cfg_space space, u32 offset, u32 length);
|
|
+int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route);
|
|
+
|
|
+
|
|
+#endif
|