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Date: Fri, 29 Nov 2013 02:35:42 +0100
From: Andreas Noever <andreas.noever@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Andreas Noever <andreas.noever@...il.com>
Subject: [PATCH 05/12] thunderbolt: Initialize root switch and ports
This patch adds the structures tb_switch and tb_port as well as code to
reset and configure the root switch.
Signed-off-by: Andreas Noever <andreas.noever@...il.com>
---
drivers/thunderbolt/tb.c | 229 ++++++++++++++++++++++++++++++++++++++++++++++-
drivers/thunderbolt/tb.h | 113 +++++++++++++++++++++++
2 files changed, 340 insertions(+), 2 deletions(-)
diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 64deb7b..d2df3be 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -8,7 +8,217 @@
#include <linux/errno.h>
#include <linux/delay.h>
+#include "dsl3510.h"
#include "tb.h"
+#include "tb_regs.h"
+
+/* utility functions */
+
+static void tb_dump_switch(struct tb *tb, struct tb_regs_switch_header *sw)
+{
+ tb_info(tb,
+ " Switch: %x:%x (Revision: %d, TB Version: %d)\n",
+ sw->vendor_id,
+ sw->device_id,
+ sw->revision,
+ sw->thunderbolt_version);
+ tb_info(tb, " Max Port Number: %d\n", sw->max_port_number);
+ tb_info(tb, " Config:\n");
+ tb_info(tb,
+ " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
+ sw->upstream_port_number,
+ sw->depth,
+ (((u64) sw->route_hi) << 32) | sw->route_lo,
+ sw->enabled,
+ sw->plug_events_delay);
+ tb_info(tb,
+ " unknown1: %#x unknown4: %#x\n",
+ sw->__unknown1,
+ sw->__unknown4);
+}
+
+static char *tb_port_type(struct tb_regs_port_header *port)
+{
+ switch (port->type >> 16) {
+ case 0:
+ switch ((u8) port->type) {
+ case 0:
+ return "Inactive";
+ case 1:
+ return "Port";
+ case 2:
+ return "NHI";
+ default:
+ return "unknown";
+ }
+ case 0x2:
+ return "Ethernet";
+ case 0x8:
+ return "SATA";
+ case 0xe:
+ return "DP/HDMI";
+ case 0x10:
+ return "PCIe";
+ case 0x20:
+ return "USB";
+ default:
+ return "unknown";
+ }
+}
+
+static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
+{
+ tb_info(tb,
+ " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
+ port->port_number,
+ port->vendor_id,
+ port->device_id,
+ port->revision,
+ port->thunderbolt_version,
+ tb_port_type(port),
+ port->type);
+ tb_info(tb,
+ " Max hop id (in/out): %d/%d, NFC Credits: %#x\n",
+ port->max_in_hop_id,
+ port->max_out_hop_id,
+ port->nfc_credits);
+}
+
+static int tb_route_length(u64 route)
+{
+ return (fls64(route) + TB_ROUTE_SHIFT - 1) / TB_ROUTE_SHIFT;
+}
+
+/* switch/port allocation & initialization */
+
+/**
+ * tb_init_port() - initialize a port
+ *
+ * This is a helper method for tb_switch_alloc. Does not check or initialize
+ * any downstream switches.
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+static int tb_init_port(struct tb_switch *sw, u8 port_nr)
+{
+ int res;
+ struct tb_port *port = &sw->ports[port_nr];
+ port->sw = sw;
+ port->port = port_nr;
+ res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
+ if (res)
+ return res;
+
+ tb_dump_port(sw->tb, &port->config);
+
+ /* TODO: Read dual link port, DP port and more from EEPROM. */
+ return 0;
+
+}
+
+/**
+ * tb_switch_free() - free a tb_switch and all downstream switches
+ */
+static void tb_switch_free(struct tb_switch *sw)
+{
+ kfree(sw->ports);
+ kfree(sw);
+}
+
+/**
+ * tb_switch_alloc() - allocate and initialize a switch
+ *
+ * Return: Returns a NULL on failure.
+ */
+static struct tb_switch *tb_switch_alloc(struct tb *tb, u64 route)
+{
+ int i;
+ struct tb_switch *sw;
+ int upstream_port = tb_cfg_get_upstream_port(tb->cfg, route);
+ if (upstream_port < 0)
+ return NULL;
+
+ sw = kzalloc(sizeof(*sw), GFP_KERNEL);
+ if (!sw)
+ return NULL;
+
+ sw->tb = tb;
+ if (tb_cfg_read(tb->cfg, &sw->config, route, 0, 2, 0, 5))
+ goto err;
+ tb_info(tb,
+ "initializing Switch at %#llx (depth: %d, up port: %d)\n",
+ route,
+ tb_route_length(route),
+ upstream_port);
+ tb_info(tb, "old switch config:\n");
+ tb_dump_switch(tb, &sw->config);
+
+ /* configure switch */
+ sw->config.upstream_port_number = upstream_port;
+ sw->config.depth = tb_route_length(route);
+ sw->config.route_lo = route;
+ sw->config.route_hi = route >> 32;
+ sw->config.enabled = 1;
+ /* from here on we may use the tb_sw_* functions & macros */
+
+ if (sw->config.vendor_id != 0x8086) {
+ tb_sw_WARN(sw,
+ "unsupported switch vendor id %#x, aborting\n",
+ sw->config.vendor_id);
+ goto err;
+ }
+ if (sw->config.device_id != 0x1547 && sw->config.device_id != 0x1549) {
+
+ tb_sw_WARN(sw,
+ "unsupported switch device id %#x, aborting\n",
+ sw->config.device_id);
+ goto err;
+ }
+
+ /* upload configuration */
+ if (tb_sw_write(sw, 1 + (u32 *) &sw->config, TB_CFG_SWITCH, 1, 3))
+ goto err;
+
+ /* initialize ports */
+ sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
+ GFP_KERNEL);
+ if (!sw->ports)
+ goto err;
+
+ for (i = 0; i <= sw->config.max_port_number; i++) {
+ if (tb_init_port(sw, i))
+ goto err;
+ /* TODO: check if port is disabled (EEPROM) */
+ }
+
+ /* TODO: I2C, IECS, EEPROM, link controller */
+
+ return sw;
+err:
+ kfree(sw->ports);
+ kfree(sw);
+ return NULL;
+}
+
+/**
+ * reset_switch() - send TB_CFG_PKG_RESET and enable switch
+ *
+ * Return: Returns 0 on success or an error code on failure.
+ */
+static int tb_switch_reset(struct tb *tb, u64 route)
+{
+ int res;
+ struct tb_regs_switch_header header = {
+ header.route_hi = route >> 32,
+ header.route_lo = route,
+ header.enabled = true,
+ };
+ tb_info(tb, "resetting switch at %llx\n", route);
+ res = tb_cfg_reset(tb->cfg, route);
+ if (res)
+ return res;
+ return tb_cfg_write(tb->cfg, ((u32 *) &header) + 2, route, 0, 2, 2, 2);
+}
struct tb_hotplug_event {
struct work_struct work;
@@ -59,13 +269,17 @@ static void tb_schedule_hotplug_handler(void *data, u64 route, u8 port,
/**
* thunderbolt_shutdown_and_free() - shutdown everything
*
- * Free the config channel.
+ * Free all switches and the config channel.
*/
void thunderbolt_shutdown_and_free(struct tb *tb)
{
mutex_lock(&tb->lock);
tb->shutdown = true; /* signal tb_handle_hotplug to quit */
+ if (tb->root_switch)
+ tb_switch_free(tb->root_switch);
+ tb->root_switch = NULL;
+
if (tb->cfg)
tb_cfg_free(tb->cfg);
tb->cfg = NULL;
@@ -84,7 +298,7 @@ void thunderbolt_shutdown_and_free(struct tb *tb)
/**
* thunderbolt_alloc_and_start() - setup the thunderbolt bus
*
- * Allocates a tb_cfg control channel.
+ * Allocates a tb_cfg control channel and initializes the root switch.
*
* Return: Returns NULL on error.
*/
@@ -92,6 +306,10 @@ struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi)
{
struct tb *tb;
+ BUILD_BUG_ON(sizeof(struct tb_regs_switch_header) != 5 * 4);
+ BUILD_BUG_ON(sizeof(struct tb_regs_port_header) != 8 * 4);
+ BUILD_BUG_ON(sizeof(struct tb_regs_hop) != 2 * 4);
+
tb = kzalloc(sizeof(*tb), GFP_KERNEL);
if (!tb)
return NULL;
@@ -112,6 +330,13 @@ struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi)
if (!tb->cfg)
goto err_locked;
+ if (tb_switch_reset(tb, 0))
+ goto err_locked;
+
+ tb->root_switch = tb_switch_alloc(tb, 0);
+ if (!tb->root_switch)
+ goto err_locked;
+
mutex_unlock(&tb->lock);
return tb;
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index a3378dc..4000f2b 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -9,8 +9,32 @@
#include <linux/pci.h>
+#include "tb_regs.h"
#include "tb_cfg.h"
+#define TB_PORT_MASK 0x3f
+#define TB_ROUTE_SHIFT 8
+
+/**
+ * struct tb_switch - a thunderbolt switch
+ */
+struct tb_switch {
+ struct tb_regs_switch_header config;
+ struct tb_port *ports;
+ struct tb *tb;
+ bool invalid; /* unplugged, will go away */
+};
+
+/**
+ * struct tb_port - a thunderbolt port, part of a tb_switch
+ */
+struct tb_port {
+ struct tb_regs_port_header config;
+ struct tb_switch *sw;
+ u8 port; /* port number on switch */
+ bool invalid; /* unplugged, will go away */
+};
+
/**
* struct tb - main thunderbolt bus structure
*/
@@ -22,12 +46,101 @@ struct tb {
struct tb_nhi *nhi;
struct tb_cfg *cfg;
struct workqueue_struct *wq; /* ordered workqueue for plug events */
+ struct tb_switch *root_switch;
bool shutdown; /*
* Once this is set tb_handle_hotplug will exit (once it
* can aquire lock at least once). Used to drain wq.
*/
};
+static inline u64 tb_route(struct tb_switch *sw)
+{
+ return ((u64) sw->config.route_hi) << 32 | sw->config.route_lo;
+}
+
+/* helper functions & macros */
+
+static inline int tb_sw_read(struct tb_switch *sw, void *buffer,
+ enum tb_cfg_space space, uint32_t offset,
+ uint32_t length)
+{
+ return tb_cfg_read(sw->tb->cfg,
+ buffer,
+ tb_route(sw),
+ 0,
+ space,
+ offset,
+ length);
+}
+
+static inline int tb_sw_write(struct tb_switch *sw, void *buffer,
+ enum tb_cfg_space space, uint32_t offset,
+ uint32_t length)
+{
+ return tb_cfg_write(sw->tb->cfg,
+ buffer,
+ tb_route(sw),
+ 0,
+ space,
+ offset,
+ length);
+}
+
+static inline int tb_port_read(struct tb_port *port, void *buffer,
+ enum tb_cfg_space space, uint32_t offset,
+ uint32_t length)
+{
+ return tb_cfg_read(port->sw->tb->cfg,
+ buffer,
+ tb_route(port->sw),
+ port->port,
+ space,
+ offset,
+ length);
+}
+
+static inline int tb_port_write(struct tb_port *port, void *buffer,
+ enum tb_cfg_space space, uint32_t offset,
+ uint32_t length)
+{
+ return tb_cfg_write(port->sw->tb->cfg,
+ buffer,
+ tb_route(port->sw),
+ port->port,
+ space,
+ offset,
+ length);
+}
+
+#define tb_WARN(tb, fmt, arg...) dev_WARN(&(tb)->nhi->pdev->dev, fmt, ## arg)
+#define tb_warn(tb, fmt, arg...) dev_warn(&(tb)->nhi->pdev->dev, fmt, ## arg)
+#define tb_info(tb, fmt, arg...) dev_info(&(tb)->nhi->pdev->dev, fmt, ## arg)
+
+
+#define __TB_SW_PRINT(level, sw, fmt, arg...) \
+ do { \
+ struct tb_switch *__sw = (sw); \
+ level(__sw->tb, "%llx: " fmt, \
+ tb_route(__sw), ## arg); \
+ } while (0)
+#define tb_sw_WARN(sw, fmt, arg...) __TB_SW_PRINT(tb_WARN, sw, fmt, ##arg)
+#define tb_sw_warn(sw, fmt, arg...) __TB_SW_PRINT(tb_warn, sw, fmt, ##arg)
+#define tb_sw_info(sw, fmt, arg...) __TB_SW_PRINT(tb_info, sw, fmt, ##arg)
+
+
+#define __TB_PORT_PRINT(level, _port, fmt, arg...) \
+ do { \
+ struct tb_port *__port = (_port); \
+ level(__port->sw->tb, "%llx:%x: " fmt, \
+ tb_route(__port->sw), __port->port, ## arg); \
+ } while (0)
+#define tb_port_WARN(port, fmt, arg...) \
+ __TB_PORT_PRINT(tb_WARN, port, fmt, ##arg)
+#define tb_port_warn(port, fmt, arg...) \
+ __TB_PORT_PRINT(tb_warn, port, fmt, ##arg)
+#define tb_port_info(port, fmt, arg...) \
+ __TB_PORT_PRINT(tb_info, port, fmt, ##arg)
+
struct tb *thunderbolt_alloc_and_start(struct tb_nhi *nhi);
void thunderbolt_shutdown_and_free(struct tb *tb);
--
1.8.4.2
--
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