[PATCH v6 2/8] i3c: master: split bus_init callback into bus_init and master_set_info

From: Parshuram Thombare
Date: Fri Apr 17 2020 - 12:21:16 EST

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To support mastership handover procedure, this patch splits the
bus_init callback into bus_init and master_set_info callbacks

Signed-off-by: Parshuram Thombare <pthombar@xxxxxxxxxxx>
---
drivers/i3c/master.c | 10 +++--
drivers/i3c/master/dw-i3c-master.c | 29 ++++++++-----
drivers/i3c/master/i3c-master-cdns.c | 63 ++++++++++++++++++----------
include/linux/i3c/master.h | 7 +++-
4 files changed, 71 insertions(+), 38 deletions(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 5f4bd52121fe..0ec332e45737 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -1716,6 +1716,10 @@ static int i3c_master_bus_init(struct i3c_master_controller *master)
if (ret)
goto err_detach_devs;

+ ret = master->ops->master_set_info(master);
+ if (ret)
+ goto err_detach_devs;
+
/*
* The master device should have been instantiated in ->bus_init(),
* complain if this was not the case.
@@ -2378,9 +2382,9 @@ EXPORT_SYMBOL_GPL(i3c_generic_ibi_recycle_slot);

static int i3c_master_check_ops(const struct i3c_master_controller_ops *ops)
{
- if (!ops || !ops->bus_init || !ops->priv_xfers ||
- !ops->send_ccc_cmd || !ops->do_daa || !ops->i2c_xfers ||
- !ops->i2c_funcs)
+ if (!ops || !ops->bus_init || !ops->master_set_info ||
+ !ops->priv_xfers || !ops->send_ccc_cmd || !ops->do_daa ||
+ !ops->i2c_xfers || !ops->i2c_funcs)
return -EINVAL;

if (ops->request_ibi &&
diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index 1d83c97431c7..5c9a72d68fb8 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -593,7 +593,6 @@ static int dw_i3c_master_bus_init(struct i3c_master_controller *m)
{
struct dw_i3c_master *master = to_dw_i3c_master(m);
struct i3c_bus *bus = i3c_master_get_bus(m);
- struct i3c_device_info info = { };
u32 thld_ctrl;
int ret;

@@ -624,6 +623,24 @@ static int dw_i3c_master_bus_init(struct i3c_master_controller *m)
writel(INTR_MASTER_MASK, master->regs + INTR_STATUS_EN);
writel(INTR_MASTER_MASK, master->regs + INTR_SIGNAL_EN);

+ writel(IBI_REQ_REJECT_ALL, master->regs + IBI_SIR_REQ_REJECT);
+ writel(IBI_REQ_REJECT_ALL, master->regs + IBI_MR_REQ_REJECT);
+
+ /* For now don't support Hot-Join */
+ writel(readl(master->regs + DEVICE_CTRL) | DEV_CTRL_HOT_JOIN_NACK,
+ master->regs + DEVICE_CTRL);
+
+ dw_i3c_master_enable(master);
+
+ return 0;
+}
+
+static int dw_i3c_master_set_info(struct i3c_master_controller *m)
+{
+ struct dw_i3c_master *master = to_dw_i3c_master(m);
+ struct i3c_device_info info = { };
+ int ret;
+
ret = i3c_master_get_free_addr(m, 0);
if (ret < 0)
return ret;
@@ -638,15 +655,6 @@ static int dw_i3c_master_bus_init(struct i3c_master_controller *m)
if (ret)
return ret;

- writel(IBI_REQ_REJECT_ALL, master->regs + IBI_SIR_REQ_REJECT);
- writel(IBI_REQ_REJECT_ALL, master->regs + IBI_MR_REQ_REJECT);
-
- /* For now don't support Hot-Join */
- writel(readl(master->regs + DEVICE_CTRL) | DEV_CTRL_HOT_JOIN_NACK,
- master->regs + DEVICE_CTRL);
-
- dw_i3c_master_enable(master);
-
return 0;
}

@@ -1088,6 +1096,7 @@ static irqreturn_t dw_i3c_master_irq_handler(int irq, void *dev_id)

static const struct i3c_master_controller_ops dw_mipi_i3c_ops = {
.bus_init = dw_i3c_master_bus_init,
+ .master_set_info = dw_i3c_master_set_info,
.bus_cleanup = dw_i3c_master_bus_cleanup,
.attach_i3c_dev = dw_i3c_master_attach_i3c_dev,
.reattach_i3c_dev = dw_i3c_master_reattach_i3c_dev,
diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-master-cdns.c
index 8889a4fdb454..c2d1631a9e38 100644
--- a/drivers/i3c/master/i3c-master-cdns.c
+++ b/drivers/i3c/master/i3c-master-cdns.c
@@ -1199,21 +1199,20 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m)
struct cdns_i3c_master *master = to_cdns_i3c_master(m);
unsigned long pres_step, sysclk_rate, max_i2cfreq;
struct i3c_bus *bus = i3c_master_get_bus(m);
- u32 ctrl, prescl0, prescl1, pres, low;
- struct i3c_device_info info = { };
- int ret, ncycles;
+ u32 ctrl, prescl0, prescl1, pres, low, bus_mode;
+ int ncycles;

switch (bus->mode) {
case I3C_BUS_MODE_PURE:
- ctrl = CTRL_PURE_BUS_MODE;
+ bus_mode = CTRL_PURE_BUS_MODE;
break;

case I3C_BUS_MODE_MIXED_FAST:
- ctrl = CTRL_MIXED_FAST_BUS_MODE;
+ bus_mode = CTRL_MIXED_FAST_BUS_MODE;
break;

case I3C_BUS_MODE_MIXED_SLOW:
- ctrl = CTRL_MIXED_SLOW_BUS_MODE;
+ bus_mode = CTRL_MIXED_SLOW_BUS_MODE;
break;

default:
@@ -1244,7 +1243,6 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m)
bus->scl_rate.i2c = sysclk_rate / ((pres + 1) * 5);

prescl0 |= PRESCL_CTRL0_I2C(pres);
- writel(prescl0, master->regs + PRESCL_CTRL0);

/* Calculate OD and PP low. */
pres_step = 1000000000 / (bus->scl_rate.i3c * 4);
@@ -1252,15 +1250,43 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m)
if (ncycles < 0)
ncycles = 0;
prescl1 = PRESCL_CTRL1_OD_LOW(ncycles);
+
+ ctrl = readl(master->regs + CTRL);
+ if (ctrl & CTRL_DEV_EN)
+ cdns_i3c_master_disable(master);
+ writel(prescl0, master->regs + PRESCL_CTRL0);
writel(prescl1, master->regs + PRESCL_CTRL1);
+ ctrl &= ~CTRL_BUS_MODE_MASK;
+ ctrl |= bus_mode | CTRL_HALT_EN | CTRL_MCS_EN;
+ /*
+ * Enable Hot-Join, and, when a Hot-Join request happens,
+ * disable all events coming from this device.
+ * We will issue ENTDAA afterwards from the threaded IRQ
+ * handler.
+ */
+ if (!m->secondary)
+ ctrl |= CTRL_HJ_ACK | CTRL_HJ_DISEC;
+ writel(ctrl, master->regs + CTRL);
+ cdns_i3c_master_enable(master);

- /* Get an address for the master. */
- ret = i3c_master_get_free_addr(m, 0);
- if (ret < 0)
- return ret;
+ return 0;
+}

- writel(prepare_rr0_dev_address(ret) | DEV_ID_RR0_IS_I3C,
- master->regs + DEV_ID_RR0(0));
+static int cdns_i3c_master_set_info(struct i3c_master_controller *m)
+{
+ struct cdns_i3c_master *master = to_cdns_i3c_master(m);
+ struct i3c_device_info info = { };
+ int ret;
+
+ if (!m->secondary) {
+ /* Get an address for the master. */
+ ret = i3c_master_get_free_addr(m, 0);
+ if (ret < 0)
+ return ret;
+
+ writel(prepare_rr0_dev_address(ret) | DEV_ID_RR0_IS_I3C,
+ master->regs + DEV_ID_RR0(0));
+ }

cdns_i3c_master_dev_rr_to_info(master, 0, &info);
if (info.bcr & I3C_BCR_HDR_CAP)
@@ -1270,16 +1296,6 @@ static int cdns_i3c_master_bus_init(struct i3c_master_controller *m)
if (ret)
return ret;

- /*
- * Enable Hot-Join, and, when a Hot-Join request happens, disable all
- * events coming from this device.
- *
- * We will issue ENTDAA afterwards from the threaded IRQ handler.
- */
- ctrl |= CTRL_HJ_ACK | CTRL_HJ_DISEC | CTRL_HALT_EN | CTRL_MCS_EN;
- writel(ctrl, master->regs + CTRL);
-
- cdns_i3c_master_enable(master);

return 0;
}
@@ -1507,6 +1523,7 @@ static void cdns_i3c_master_recycle_ibi_slot(struct i3c_dev_desc *dev,

static const struct i3c_master_controller_ops cdns_i3c_master_ops = {
.bus_init = cdns_i3c_master_bus_init,
+ .master_set_info = cdns_i3c_master_set_info,
.bus_cleanup = cdns_i3c_master_bus_cleanup,
.do_daa = cdns_i3c_master_do_daa,
.attach_i3c_dev = cdns_i3c_master_attach_i3c_dev,
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index f13fd8b1dd79..3dc7eafe811a 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -337,10 +337,12 @@ struct i3c_bus {

/**
* struct i3c_master_controller_ops - I3C master methods
- * @bus_init: hook responsible for the I3C bus initialization. You should at
- * least call master_set_info() from there and set the bus mode.
+ * @bus_init: hook responsible for the I3C bus initialization.
* You can also put controller specific initialization in there.
* This method is mandatory.
+ * @master_set_info: hook responsible for assigning address to main master.
+ * You should call i3c_master_set_info from here.
+ * This method is mandatory.
* @bus_cleanup: cleanup everything done in
* &i3c_master_controller_ops->bus_init().
* This method is optional.
@@ -421,6 +423,7 @@ struct i3c_bus {
*/
struct i3c_master_controller_ops {
int (*bus_init)(struct i3c_master_controller *master);
+ int (*master_set_info)(struct i3c_master_controller *m);
void (*bus_cleanup)(struct i3c_master_controller *master);
int (*attach_i3c_dev)(struct i3c_dev_desc *dev);
int (*reattach_i3c_dev)(struct i3c_dev_desc *dev, u8 old_dyn_addr);
--
2.17.1

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