Commit a372cfac authored by Adrian Hunter's avatar Adrian Hunter Committed by Alexandre Belloni
Browse files

i3c: mipi-i3c-hci: Cache DAT in memory for Runtime PM restore 



Prepare for Runtime PM support, which requires restoring the Device Address
Table (DAT) registers after resume.  Maintain a copy of DAT in memory so it
can be reprogrammed when the controller is powered back up.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Reviewed-by: default avatarFrank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260113072702.16268-9-adrian.hunter@intel.com


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 29bf98a6

drivers/i3c/master/mipi-i3c-hci/dat_v1.c

+23 −6
Original line number Diff line number Diff line
@@ -34,13 +34,26 @@ 
/*	DAT_0_IBI_PAYLOAD		W0_BIT_(12) */

#define DAT_0_STATIC_ADDRESS		W0_MASK(6, 0)



#define dat_w0_read(i)		readl(hci->DAT_regs + (i) * 8)

#define dat_w1_read(i)		readl(hci->DAT_regs + (i) * 8 + 4)

#define dat_w0_write(i, v)	writel(v, hci->DAT_regs + (i) * 8)

#define dat_w1_write(i, v)	writel(v, hci->DAT_regs + (i) * 8 + 4)

#define dat_w0_read(i)		hci->DAT[i].w0

#define dat_w1_read(i)		hci->DAT[i].w1

#define dat_w0_write(i, v)	hci_dat_w0_write(hci, i, v)

#define dat_w1_write(i, v)	hci_dat_w1_write(hci, i, v)



static inline void hci_dat_w0_write(struct i3c_hci *hci, int i, u32 v)

{

	hci->DAT[i].w0 = v;

	writel(v, hci->DAT_regs + i * 8);

}



static inline void hci_dat_w1_write(struct i3c_hci *hci, int i, u32 v)

{

	hci->DAT[i].w1 = v;

	writel(v, hci->DAT_regs + i * 8 + 4);

}



static int hci_dat_v1_init(struct i3c_hci *hci)

{

	struct device *dev = hci->master.dev.parent;

	unsigned int dat_idx;



	if (!hci->DAT_regs) {
@@ -54,9 +67,13 @@ static int hci_dat_v1_init(struct i3c_hci *hci) 
		return -EOPNOTSUPP;

	}



	if (!hci->DAT_data) {

		struct device *dev = hci->master.dev.parent;

	if (!hci->DAT) {

		hci->DAT = devm_kcalloc(dev, hci->DAT_entries, hci->DAT_entry_size, GFP_KERNEL);

		if (!hci->DAT)

			return -ENOMEM;

	}



	if (!hci->DAT_data) {

		/* use a bitmap for faster free slot search */

		hci->DAT_data = devm_bitmap_zalloc(dev, hci->DAT_entries, GFP_KERNEL);

		if (!hci->DAT_data)

drivers/i3c/master/mipi-i3c-hci/hci.h

+6 −0
Original line number Diff line number Diff line
@@ -31,6 +31,11 @@ 


struct hci_cmd_ops;



struct dat_words {

	u32 w0;

	u32 w1;

};



/* Our main structure */

struct i3c_hci {

	struct i3c_master_controller master;
@@ -51,6 +56,7 @@ struct i3c_hci { 
	unsigned int DAT_entries;

	unsigned int DAT_entry_size;

	void *DAT_data;

	struct dat_words *DAT;

	unsigned int DCT_entries;

	unsigned int DCT_entry_size;

	u8 version_major;