diff options
| author | Jeremy Kerr <jk@codeconstruct.com.au> | 2023-03-30 15:50:34 +0800 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2023-04-28 08:20:07 +0200 |
| commit | e389b1d72a6241b326071dd75e1b33f9e8818cd1 (patch) | |
| tree | b45acb77078b5337028c7131fbf04d4eecdc4358 /drivers/i3c/master/dw-i3c-master.h | |
| parent | e2d43101f61d6e79510d1cd9e7052b4745b8d809 (diff) | |
i3c: dw: Add support for in-band interrupts
This change adds support for receiving and dequeueing i3c IBIs.
By setting struct dw_i3c_master->ibi_capable before probe, a platform
implementation can select the IBI-enabled version of the i3c_master_ops,
enabling the global IBI infrastrcture for that controller.
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/79daeefd7ccb7c935d0c159149df21a6c9a73ffa.1680161823.git.jk@codeconstruct.com.au
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/i3c/master/dw-i3c-master.h')
| -rw-r--r-- | drivers/i3c/master/dw-i3c-master.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/i3c/master/dw-i3c-master.h b/drivers/i3c/master/dw-i3c-master.h index 5fb620727639..a5425fa6b7d4 100644 --- a/drivers/i3c/master/dw-i3c-master.h +++ b/drivers/i3c/master/dw-i3c-master.h @@ -19,6 +19,7 @@ struct dw_i3c_master_caps { struct dw_i3c_dat_entry { u8 addr; + struct i3c_dev_desc *ibi_dev; }; struct dw_i3c_master { @@ -37,12 +38,22 @@ struct dw_i3c_master { struct clk *core_clk; char version[5]; char type[5]; + bool ibi_capable; /* * Per-device hardware data, used to manage the device address table * (DAT) + * + * Locking: the devs array may be referenced in IRQ context while + * processing an IBI. However, IBIs (for a specific device, which + * implies a specific DAT entry) can only happen while interrupts are + * requested for that device, which is serialised against other + * insertions/removals from the array by the global i3c infrastructure. + * So, devs_lock protects against concurrent updates to devs->ibi_dev + * between request_ibi/free_ibi and the IBI irq event. */ struct dw_i3c_dat_entry devs[DW_I3C_MAX_DEVS]; + spinlock_t devs_lock; /* platform-specific data */ const struct dw_i3c_platform_ops *platform_ops; |