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Message-ID: <1587140555-31191-1-git-send-email-pthombar@cadence.com>
Date: Fri, 17 Apr 2020 18:22:35 +0200
From: Parshuram Thombare <pthombar@...ence.com>
To: <bbrezillon@...nel.org>, <vitor.soares@...opsys.com>
CC: <pgaj@...ence.com>, <linux-i3c@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>, <mparab@...ence.com>,
<praneeth@...com>, Parshuram Thombare <pthombar@...ence.com>
Subject: [PATCH v6 6/8] i3c: master: secondary master initialization
This patch add secondary master support to
I3C master subsystem.
Signed-off-by: Parshuram Thombare <pthombar@...ence.com>
---
drivers/i3c/master.c | 153 ++++++++++++++++++++++++++++---------
include/linux/i3c/master.h | 1 +
2 files changed, 116 insertions(+), 38 deletions(-)
diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 19d4800ed573..39a412b32c59 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1621,10 +1621,6 @@ int i3c_master_set_info(struct i3c_master_controller *master,
if (!i3c_bus_dev_addr_is_avail(&master->bus, info->dyn_addr))
return -EINVAL;
- if (I3C_BCR_DEVICE_ROLE(info->bcr) == I3C_BCR_I3C_MASTER &&
- master->secondary)
- return -EINVAL;
-
if (master->this)
return -EINVAL;
@@ -2040,9 +2036,10 @@ EXPORT_SYMBOL_GPL(i3c_master_process_defslvs);
* 1. Attach I2C and statically defined I3C devs to the master so that the
* master can fill its internal device table appropriately
*
- * 2. Call &i3c_master_controller_ops->bus_init() method to initialize
- * the master controller. That's usually where the bus mode is selected
- * (pure bus or mixed fast/slow bus)
+ * 2. Should have called &i3c_master_controller_ops->bus_init()
+ * method with pure bus mode to initialize the master controller.
+ * That's usually where the bus mode is selected (pure bus or
+ * mixed fast/slow bus)
*
* 3. Instruct all devices on the bus to drop their dynamic address. This is
* particularly important when the bus was previously configured by someone
@@ -2126,14 +2123,6 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
}
}
- /*
- * Now execute the controller specific ->bus_init() routine, which
- * might configure its internal logic to match the bus limitations.
- */
- ret = master->ops->bus_init(master);
- if (ret)
- goto err_detach_devs;
-
ret = master->ops->master_set_info(master);
if (ret)
goto err_detach_devs;
@@ -2146,7 +2135,7 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
dev_err(&master->dev,
"master_set_info() was not called in ->bus_init()\n");
ret = -EINVAL;
- goto err_bus_cleanup;
+ goto err_detach_devs;
}
/*
@@ -2155,14 +2144,14 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
*/
ret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR);
if (ret && ret != I3C_ERROR_M2)
- goto err_bus_cleanup;
+ goto err_detach_devs;
/* Disable all slave events before starting DAA. */
ret = i3c_master_disec_locked(master, I3C_BROADCAST_ADDR,
I3C_CCC_EVENT_SIR | I3C_CCC_EVENT_MR |
I3C_CCC_EVENT_HJ);
if (ret && ret != I3C_ERROR_M2)
- goto err_bus_cleanup;
+ goto err_detach_devs;
/*
* Pre-assign dynamic address and retrieve device information if
@@ -2180,10 +2169,6 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
err_rstdaa:
i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR);
-err_bus_cleanup:
- if (master->ops->bus_cleanup)
- master->ops->bus_cleanup(master);
-
err_detach_devs:
i3c_master_detach_free_devs(master);
@@ -2813,9 +2798,68 @@ static int i3c_master_check_ops(const struct i3c_master_controller_ops *ops)
!ops->recycle_ibi_slot))
return -EINVAL;
+ if (ops->request_mastership &&
+ (!ops->enable_mr_events || !ops->disable_mr_events ||
+ !ops->check_event_set))
+ return -EINVAL;
+
return 0;
}
+static void i3c_secondary_master_register(struct work_struct *work)
+{
+ struct i3c_master_controller *master;
+ struct i3c_bus *i3cbus;
+ int ret;
+
+ master = container_of(work, struct i3c_master_controller,
+ sec_mst_register_work);
+ i3cbus = i3c_master_get_bus(master);
+
+ i3c_bus_normaluse_lock(&master->bus);
+ if (!master->ops->check_event_set(master, I3C_SLV_DEFSLVS_CCC) ||
+ i3c_master_acquire_bus(master)) {
+ i3c_bus_normaluse_unlock(&master->bus);
+ queue_work(master->wq, work);
+ return;
+ }
+ i3c_bus_normaluse_unlock(&master->bus);
+
+ ret = device_add(&master->dev);
+ if (ret)
+ goto err_cleanup_bus;
+
+ /*
+ * Expose our I3C bus as an I2C adapter so that I2C devices are exposed
+ * through the I2C subsystem.
+ */
+ ret = i3c_master_i2c_adapter_init(master);
+ if (ret)
+ goto err_del_dev;
+
+ /*
+ * We're done initializing the bus and the controller, we can now
+ * register I3C devices from defslvs list.
+ */
+ master->init_done = true;
+ i3c_bus_normaluse_lock(&master->bus);
+ i3c_master_register_new_i3c_devs(master);
+ i3c_bus_normaluse_unlock(&master->bus);
+
+ i3c_master_enable_mr_events(master);
+
+ return;
+
+err_del_dev:
+ device_del(&master->dev);
+
+err_cleanup_bus:
+ if (master->ops->bus_cleanup)
+ master->ops->bus_cleanup(master);
+
+ put_device(&master->dev);
+}
+
/**
* i3c_master_register() - register an I3C master
* @master: master used to send frames on the bus
@@ -2845,10 +2889,10 @@ int i3c_master_register(struct i3c_master_controller *master,
struct i3c_bus *i3cbus = i3c_master_get_bus(master);
enum i3c_bus_mode mode = I3C_BUS_MODE_PURE;
struct i2c_dev_boardinfo *i2cbi;
- int ret;
+ int ret, sz;
- /* We do not support secondary masters yet. */
- if (secondary)
+ /*Check if controller driver supports secondary masters. */
+ if (secondary && !ops->request_mastership)
return -ENOTSUPP;
ret = i3c_master_check_ops(ops);
@@ -2872,13 +2916,45 @@ int i3c_master_register(struct i3c_master_controller *master,
device_initialize(&master->dev);
dev_set_name(&master->dev, "i3c-%d", i3cbus->id);
+ master->wq = alloc_workqueue("%s", 0, 0, dev_name(parent));
+ if (!master->wq) {
+ ret = -ENOMEM;
+ goto err_put_dev;
+ }
+
+ master->mr_state = I3C_MR_IDLE;
INIT_WORK(&master->sec_mst_work, i3c_sec_mst_acquire_bus);
INIT_WORK(&master->mst_work, i3c_mst_yield_bus);
- ret = of_populate_i3c_bus(master);
+ ret = i3c_bus_set_mode(i3cbus, mode);
+ if (ret)
+ goto err_put_dev;
+
+ /*
+ * Now execute the controller specific ->bus_init() routine, which
+ * might configure its internal logic to match the bus limitations.
+ */
+ ret = master->ops->bus_init(master);
if (ret)
goto err_put_dev;
+ if (secondary) {
+ sz = sizeof(struct i3c_ccc_dev_desc) * I3C_BUS_MAX_DEVS;
+ master->defslvs_data.devs = devm_kzalloc(&master->dev, sz,
+ GFP_KERNEL);
+ if (!master->defslvs_data.devs)
+ goto err_put_dev;
+
+ INIT_WORK(&master->sec_mst_register_work,
+ i3c_secondary_master_register);
+ queue_work(master->wq, &master->sec_mst_register_work);
+ return 0;
+ }
+
+ ret = of_populate_i3c_bus(master);
+ if (ret)
+ goto err_cleanup_bus;
+
list_for_each_entry(i2cbi, &master->boardinfo.i2c, node) {
switch (i2cbi->lvr & I3C_LVR_I2C_INDEX_MASK) {
case I3C_LVR_I2C_INDEX(0):
@@ -2892,23 +2968,13 @@ int i3c_master_register(struct i3c_master_controller *master,
break;
default:
ret = -EINVAL;
- goto err_put_dev;
+ goto err_cleanup_bus;
}
}
- ret = i3c_bus_set_mode(i3cbus, mode);
- if (ret)
- goto err_put_dev;
-
- master->wq = alloc_workqueue("%s", 0, 0, dev_name(parent));
- if (!master->wq) {
- ret = -ENOMEM;
- goto err_put_dev;
- }
-
ret = i3c_master_bus_init(master);
if (ret)
- goto err_put_dev;
+ goto err_cleanup_bus;
ret = device_add(&master->dev);
if (ret)
@@ -2931,6 +2997,17 @@ int i3c_master_register(struct i3c_master_controller *master,
i3c_master_register_new_i3c_devs(master);
i3c_bus_normaluse_unlock(&master->bus);
+ ret = i3c_bus_set_mode(i3cbus, mode);
+ if (ret)
+ goto err_del_dev;
+
+ ret = master->ops->bus_init(master);
+ if (ret)
+ goto err_del_dev;
+
+ if (ops->request_mastership)
+ i3c_master_enable_mr_events(master);
+
return 0;
err_del_dev:
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index cc482934803b..08b63e285b7b 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -515,6 +515,7 @@ struct i3c_master_controller {
} boardinfo;
struct i3c_bus bus;
struct workqueue_struct *wq;
+ struct work_struct sec_mst_register_work;
struct work_struct mst_work;
struct work_struct sec_mst_work;
struct completion mr_comp;
--
2.17.1
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