linux-kernel - [RFC PATCH 09/13] pinctrl: renesas: pinctrl-rzg2l: Add function pointer for writing to PMC register

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Tue, 26 Mar 2024 22:28:40 +0000
From: Prabhakar <prabhakar.csengg@...il.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>,
	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Magnus Damm <magnus.damm@...il.com>
Cc: linux-renesas-soc@...r.kernel.org,
	linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [RFC PATCH 09/13] pinctrl: renesas: pinctrl-rzg2l: Add function pointer for writing to PMC register

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

This patch introduces a function pointer, pmc_writeb(), in the
struct rzg2l_pinctrl_data to facilitate writing to the PMC register. On
the RZ/V2H(P) SoC, unlocking the PWPR.REGWE_A bit before writing to PMC
registers is required, whereas this is not the case for the existing
RZ/G2L family. This addition enables the reuse of existing code for
RZ/V2H(P). Additionally, this patch populates this function pointer with
appropriate data for existing SoCs.

Note that this functionality is only handled in rzg2l_gpio_request(), as
PMC unlock/lock during PFC setup will be taken care of in the
set_pfc_mode/pm_set_pfc callbacks.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/pinctrl/renesas/pinctrl-rzg2l.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index 4cdebdbd8a04..3de97d5e198a 100644
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -260,6 +260,7 @@ struct rzg2l_pinctrl_data {
 	unsigned int n_variable_pin_cfg;
 	void (*set_pfc_mode)(struct rzg2l_pinctrl *pctrl, u8 pin, u8 off, u8 func);
 	void (*pm_set_pfc)(struct rzg2l_pinctrl *pctrl);
+	void (*pmc_writeb)(struct rzg2l_pinctrl *pctrl, u8 val, void __iomem *addr);
 };
 
 /**
@@ -463,6 +464,11 @@ static const struct rzg2l_variable_pin_cfg r9a07g043f_variable_pin_cfg[] = {
 };
 #endif
 
+static void rzg2l_pmc_writeb(struct rzg2l_pinctrl *pctrl, u8 val, void __iomem *addr)
+{
+	writeb(val, addr);
+}
+
 static void rzg2l_pinctrl_set_pfc_mode(struct rzg2l_pinctrl *pctrl,
 				       u8 pin, u8 off, u8 func)
 {
@@ -1413,7 +1419,7 @@ static int rzg2l_gpio_request(struct gpio_chip *chip, unsigned int offset)
 	/* Select GPIO mode in PMC Register */
 	reg8 = readb(pctrl->base + PMC(off));
 	reg8 &= ~BIT(bit);
-	writeb(reg8, pctrl->base + PMC(off));
+	pctrl->data->pmc_writeb(pctrl, reg8, pctrl->base + PMC(off));
 
 	spin_unlock_irqrestore(&pctrl->lock, flags);
 
@@ -2678,6 +2684,7 @@ static struct rzg2l_pinctrl_data r9a07g043_data = {
 #endif
 	.set_pfc_mode = &rzg2l_pinctrl_set_pfc_mode,
 	.pm_set_pfc = &rzg2l_pinctrl_pm_setup_pfc,
+	.pmc_writeb = &rzg2l_pmc_writeb,
 };
 
 static struct rzg2l_pinctrl_data r9a07g044_data = {
@@ -2691,6 +2698,7 @@ static struct rzg2l_pinctrl_data r9a07g044_data = {
 	.hwcfg = &rzg2l_hwcfg,
 	.set_pfc_mode = &rzg2l_pinctrl_set_pfc_mode,
 	.pm_set_pfc = &rzg2l_pinctrl_pm_setup_pfc,
+	.pmc_writeb = &rzg2l_pmc_writeb,
 };
 
 static struct rzg2l_pinctrl_data r9a08g045_data = {
@@ -2703,6 +2711,7 @@ static struct rzg2l_pinctrl_data r9a08g045_data = {
 	.hwcfg = &rzg3s_hwcfg,
 	.set_pfc_mode = &rzg2l_pinctrl_set_pfc_mode,
 	.pm_set_pfc = &rzg2l_pinctrl_pm_setup_pfc,
+	.pmc_writeb = &rzg2l_pmc_writeb,
 };
 
 static const struct of_device_id rzg2l_pinctrl_of_table[] = {
-- 
2.34.1