[PATCH v3 3/4] i3c: renesas: Factor out hardware initialization to separate function

[Tommaso Merciai]

Move the hardware initialization sequence in renesas_i3c_bus_init()
into a dedicated renesas_i3c_hw_init() helper.

Simplify the code and prepare the driver for upcoming suspend/resume
support.

No functional change intended.

Reviewed-by: Frank Li <Frank.Li at nxp.com>
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr at bp.renesas.com>
---
v2->v3:
 - Collected FLi tag.
 - Improved commit body.

v1->v2:
 - New patch

 drivers/i3c/master/renesas-i3c.c | 99 ++++++++++++++++++--------------
 1 file changed, 55 insertions(+), 44 deletions(-)

diff --git a/drivers/i3c/master/renesas-i3c.c b/drivers/i3c/master/renesas-i3c.c
index 7359f71f78dd..b065b8d4b138 100644
--- a/drivers/i3c/master/renesas-i3c.c
+++ b/drivers/i3c/master/renesas-i3c.c
@@ -479,13 +479,65 @@ static int renesas_i3c_reset(struct renesas_i3c *i3c)
 				 0, 1000, false, i3c->regs, RSTCTL);
 }
 
+static void renesas_i3c_hw_init(struct renesas_i3c *i3c)
+{
+	u32 val;
+
+	/* Disable Slave Mode */
+	renesas_writel(i3c->regs, SVCTL, 0);
+
+	/* Initialize Queue/Buffer threshold */
+	renesas_writel(i3c->regs, NQTHCTL, NQTHCTL_IBIDSSZ(6) |
+		       NQTHCTL_CMDQTH(1));
+
+	/* The only supported configuration is two entries*/
+	renesas_writel(i3c->regs, NTBTHCTL0, 0);
+	/* Interrupt when there is one entry in the queue */
+	renesas_writel(i3c->regs, NRQTHCTL, 0);
+
+	/* Enable all Bus/Transfer Status Flags */
+	renesas_writel(i3c->regs, BSTE, BSTE_ALL_FLAG);
+	renesas_writel(i3c->regs, NTSTE, NTSTE_ALL_FLAG);
+
+	/* Interrupt enable settings */
+	renesas_writel(i3c->regs, BIE, BIE_NACKDIE | BIE_TENDIE);
+	renesas_writel(i3c->regs, NTIE, 0);
+
+	/* Clear Status register */
+	renesas_writel(i3c->regs, NTST, 0);
+	renesas_writel(i3c->regs, INST, 0);
+	renesas_writel(i3c->regs, BST, 0);
+
+	/* Hot-Join Acknowlege setting. */
+	renesas_set_bit(i3c->regs, BCTL, BCTL_HJACKCTL);
+
+	renesas_writel(i3c->regs, IBINCTL, IBINCTL_NRHJCTL | IBINCTL_NRMRCTL |
+		       IBINCTL_NRSIRCTL);
+
+	renesas_writel(i3c->regs, SCSTLCTL, 0);
+	renesas_set_bit(i3c->regs, SCSTRCTL, SCSTRCTL_ACKTWE);
+
+	/* Bus condition timing */
+	val = DIV_ROUND_UP(I3C_BUS_TBUF_MIXED_FM_MIN_NS,
+			   NSEC_PER_SEC / i3c->rate);
+	renesas_writel(i3c->regs, BFRECDT, BFRECDT_FRECYC(val));
+
+	val = DIV_ROUND_UP(I3C_BUS_TAVAL_MIN_NS,
+			   NSEC_PER_SEC / i3c->rate);
+	renesas_writel(i3c->regs, BAVLCDT, BAVLCDT_AVLCYC(val));
+
+	val = DIV_ROUND_UP(I3C_BUS_TIDLE_MIN_NS,
+			   NSEC_PER_SEC / i3c->rate);
+	renesas_writel(i3c->regs, BIDLCDT, BIDLCDT_IDLCYC(val));
+}
+
 static int renesas_i3c_bus_init(struct i3c_master_controller *m)
 {
 	struct renesas_i3c *i3c = to_renesas_i3c(m);
 	struct i3c_bus *bus = i3c_master_get_bus(m);
 	struct i3c_device_info info = {};
 	struct i2c_timings t;
-	u32 double_SBR, val;
+	u32 double_SBR;
 	int cks, pp_high_ticks, pp_low_ticks, i3c_total_ticks;
 	int od_high_ticks, od_low_ticks, i2c_total_ticks;
 	int ret;
@@ -558,49 +610,8 @@ static int renesas_i3c_bus_init(struct i3c_master_controller *m)
 
 	renesas_writel(i3c->regs, REFCKCTL, REFCKCTL_IREFCKS(cks));
 
-	/* Disable Slave Mode */
-	renesas_writel(i3c->regs, SVCTL, 0);
-
-	/* Initialize Queue/Buffer threshold */
-	renesas_writel(i3c->regs, NQTHCTL, NQTHCTL_IBIDSSZ(6) |
-					     NQTHCTL_CMDQTH(1));
-
-	/* The only supported configuration is two entries*/
-	renesas_writel(i3c->regs, NTBTHCTL0, 0);
-	/* Interrupt when there is one entry in the queue */
-	renesas_writel(i3c->regs, NRQTHCTL, 0);
-
-	/* Enable all Bus/Transfer Status Flags */
-	renesas_writel(i3c->regs, BSTE, BSTE_ALL_FLAG);
-	renesas_writel(i3c->regs, NTSTE, NTSTE_ALL_FLAG);
-
-	/* Interrupt enable settings */
-	renesas_writel(i3c->regs, BIE, BIE_NACKDIE | BIE_TENDIE);
-	renesas_writel(i3c->regs, NTIE, 0);
-
-	/* Clear Status register */
-	renesas_writel(i3c->regs, NTST, 0);
-	renesas_writel(i3c->regs, INST, 0);
-	renesas_writel(i3c->regs, BST, 0);
-
-	/* Hot-Join Acknowlege setting. */
-	renesas_set_bit(i3c->regs, BCTL, BCTL_HJACKCTL);
-
-	renesas_writel(i3c->regs, IBINCTL, IBINCTL_NRHJCTL | IBINCTL_NRMRCTL |
-					     IBINCTL_NRSIRCTL);
-
-	renesas_writel(i3c->regs, SCSTLCTL, 0);
-	renesas_set_bit(i3c->regs, SCSTRCTL, SCSTRCTL_ACKTWE);
-
-	/* Bus condition timing */
-	val = DIV_ROUND_UP(I3C_BUS_TBUF_MIXED_FM_MIN_NS, NSEC_PER_SEC / i3c->rate);
-	renesas_writel(i3c->regs, BFRECDT, BFRECDT_FRECYC(val));
-
-	val = DIV_ROUND_UP(I3C_BUS_TAVAL_MIN_NS, NSEC_PER_SEC / i3c->rate);
-	renesas_writel(i3c->regs, BAVLCDT, BAVLCDT_AVLCYC(val));
-
-	val = DIV_ROUND_UP(I3C_BUS_TIDLE_MIN_NS, NSEC_PER_SEC / i3c->rate);
-	renesas_writel(i3c->regs, BIDLCDT, BIDLCDT_IDLCYC(val));
+	/* I3C hw init*/
+	renesas_i3c_hw_init(i3c);
 
 	ret = i3c_master_get_free_addr(m, 0);
 	if (ret < 0)
-- 
2.43.0