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Message-ID: <20250912104733.173281-5-biju.das.jz@bp.renesas.com>
Date: Fri, 12 Sep 2025 11:47:22 +0100
From: Biju <biju.das.au@...il.com>
To: Marc Kleine-Budde <mkl@...gutronix.de>,
Vincent Mailhol <mailhol.vincent@...adoo.fr>,
Geert Uytterhoeven <geert+renesas@...der.be>,
Magnus Damm <magnus.damm@...il.com>,
Philipp Zabel <p.zabel@...gutronix.de>
Cc: Biju Das <biju.das.jz@...renesas.com>,
linux-can@...r.kernel.org,
linux-renesas-soc@...r.kernel.org,
linux-kernel@...r.kernel.org,
Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
Biju Das <biju.das.au@...il.com>
Subject: [PATCH v2 4/7] can: rcar_canfd: Extract rcar_canfd_global_{,de}init()
From: Geert Uytterhoeven <geert+renesas@...der.be>
Extract the code to (de)initialize global state into separate functions,
for future reuse.
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
v1->v2:
* Added RAM clk handling in rcar_canfd_global_{,de}init().
---
drivers/net/can/rcar/rcar_canfd.c | 182 +++++++++++++++++-------------
1 file changed, 104 insertions(+), 78 deletions(-)
diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index da469595be74..c26a605659eb 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -1961,21 +1961,120 @@ static void rcar_canfd_channel_remove(struct rcar_canfd_global *gpriv, u32 ch)
}
}
+static int rcar_canfd_global_init(struct rcar_canfd_global *gpriv)
+{
+ struct device *dev = &gpriv->pdev->dev;
+ u32 rule_entry = 0;
+ u32 ch, sts;
+ int err;
+
+ err = reset_control_reset(gpriv->rstc1);
+ if (err)
+ return err;
+
+ err = reset_control_reset(gpriv->rstc2);
+ if (err)
+ goto fail_reset1;
+
+ /* Enable peripheral clock for register access */
+ err = clk_prepare_enable(gpriv->clkp);
+ if (err) {
+ dev_err(dev, "failed to enable peripheral clock: %pe\n",
+ ERR_PTR(err));
+ goto fail_reset2;
+ }
+
+ /* Enable RAM clock */
+ err = clk_prepare_enable(gpriv->clk_ram);
+ if (err) {
+ dev_err(dev,
+ "failed to enable RAM clock, error %d\n", err);
+ goto fail_clk;
+ }
+
+ err = rcar_canfd_reset_controller(gpriv);
+ if (err) {
+ dev_err(dev, "reset controller failed: %pe\n", ERR_PTR(err));
+ goto fail_ram_clk;
+ }
+
+ /* Controller in Global reset & Channel reset mode */
+ rcar_canfd_configure_controller(gpriv);
+
+ /* Configure per channel attributes */
+ for_each_set_bit(ch, &gpriv->channels_mask, gpriv->info->max_channels) {
+ /* Configure Channel's Rx fifo */
+ rcar_canfd_configure_rx(gpriv, ch);
+
+ /* Configure Channel's Tx (Common) fifo */
+ rcar_canfd_configure_tx(gpriv, ch);
+
+ /* Configure receive rules */
+ rcar_canfd_configure_afl_rules(gpriv, ch, rule_entry);
+ rule_entry += RCANFD_CHANNEL_NUMRULES;
+ }
+
+ /* Configure common interrupts */
+ rcar_canfd_enable_global_interrupts(gpriv);
+
+ /* Start Global operation mode */
+ rcar_canfd_update_bit(gpriv->base, RCANFD_GCTR, RCANFD_GCTR_GMDC_MASK,
+ RCANFD_GCTR_GMDC_GOPM);
+
+ /* Verify mode change */
+ err = readl_poll_timeout((gpriv->base + RCANFD_GSTS), sts,
+ !(sts & RCANFD_GSTS_GNOPM), 2, 500000);
+ if (err) {
+ dev_err(dev, "global operational mode failed\n");
+ goto fail_mode;
+ }
+
+ return 0;
+
+fail_mode:
+ rcar_canfd_disable_global_interrupts(gpriv);
+fail_ram_clk:
+ clk_disable_unprepare(gpriv->clk_ram);
+fail_clk:
+ clk_disable_unprepare(gpriv->clkp);
+fail_reset2:
+ reset_control_assert(gpriv->rstc2);
+fail_reset1:
+ reset_control_assert(gpriv->rstc1);
+ return err;
+}
+
+static void rcar_canfd_global_deinit(struct rcar_canfd_global *gpriv, bool full)
+{
+ rcar_canfd_disable_global_interrupts(gpriv);
+
+ if (full) {
+ rcar_canfd_reset_controller(gpriv);
+
+ /* Enter global sleep mode */
+ rcar_canfd_set_bit(gpriv->base, RCANFD_GCTR, RCANFD_GCTR_GSLPR);
+ }
+
+ clk_disable_unprepare(gpriv->clk_ram);
+ clk_disable_unprepare(gpriv->clkp);
+ reset_control_assert(gpriv->rstc2);
+ reset_control_assert(gpriv->rstc1);
+}
+
static int rcar_canfd_probe(struct platform_device *pdev)
{
struct phy *transceivers[RCANFD_NUM_CHANNELS] = { NULL, };
const struct rcar_canfd_hw_info *info;
struct device *dev = &pdev->dev;
void __iomem *addr;
- u32 sts, ch, fcan_freq;
struct rcar_canfd_global *gpriv;
struct device_node *of_child;
unsigned long channels_mask = 0;
int err, ch_irq, g_irq;
int g_err_irq, g_recc_irq;
- u32 rule_entry = 0;
bool fdmode = true; /* CAN FD only mode - default */
char name[9] = "channelX";
+ u32 ch, fcan_freq;
int i;
info = of_device_get_match_data(dev);
@@ -2117,67 +2216,9 @@ static int rcar_canfd_probe(struct platform_device *pdev)
}
}
- err = reset_control_reset(gpriv->rstc1);
+ err = rcar_canfd_global_init(gpriv);
if (err)
- goto fail_dev;
- err = reset_control_reset(gpriv->rstc2);
- if (err) {
- reset_control_assert(gpriv->rstc1);
- goto fail_dev;
- }
-
- /* Enable peripheral clock for register access */
- err = clk_prepare_enable(gpriv->clkp);
- if (err) {
- dev_err(dev, "failed to enable peripheral clock: %pe\n",
- ERR_PTR(err));
- goto fail_reset;
- }
-
- /* Enable RAM clock */
- err = clk_prepare_enable(gpriv->clk_ram);
- if (err) {
- dev_err(dev, "failed to enable RAM clock: %pe\n",
- ERR_PTR(err));
- goto fail_clk;
- }
-
- err = rcar_canfd_reset_controller(gpriv);
- if (err) {
- dev_err(dev, "reset controller failed: %pe\n", ERR_PTR(err));
- goto fail_ram_clk;
- }
-
- /* Controller in Global reset & Channel reset mode */
- rcar_canfd_configure_controller(gpriv);
-
- /* Configure per channel attributes */
- for_each_set_bit(ch, &gpriv->channels_mask, info->max_channels) {
- /* Configure Channel's Rx fifo */
- rcar_canfd_configure_rx(gpriv, ch);
-
- /* Configure Channel's Tx (Common) fifo */
- rcar_canfd_configure_tx(gpriv, ch);
-
- /* Configure receive rules */
- rcar_canfd_configure_afl_rules(gpriv, ch, rule_entry);
- rule_entry += RCANFD_CHANNEL_NUMRULES;
- }
-
- /* Configure common interrupts */
- rcar_canfd_enable_global_interrupts(gpriv);
-
- /* Start Global operation mode */
- rcar_canfd_update_bit(gpriv->base, RCANFD_GCTR, RCANFD_GCTR_GMDC_MASK,
- RCANFD_GCTR_GMDC_GOPM);
-
- /* Verify mode change */
- err = readl_poll_timeout((gpriv->base + RCANFD_GSTS), sts,
- !(sts & RCANFD_GSTS_GNOPM), 2, 500000);
- if (err) {
- dev_err(dev, "global operational mode failed\n");
goto fail_mode;
- }
for_each_set_bit(ch, &gpriv->channels_mask, info->max_channels) {
err = rcar_canfd_channel_probe(gpriv, ch, fcan_freq,
@@ -2196,14 +2237,7 @@ static int rcar_canfd_probe(struct platform_device *pdev)
for_each_set_bit(ch, &gpriv->channels_mask, info->max_channels)
rcar_canfd_channel_remove(gpriv, ch);
fail_mode:
- rcar_canfd_disable_global_interrupts(gpriv);
-fail_ram_clk:
- clk_disable_unprepare(gpriv->clk_ram);
-fail_clk:
- clk_disable_unprepare(gpriv->clkp);
-fail_reset:
- reset_control_assert(gpriv->rstc2);
- reset_control_assert(gpriv->rstc1);
+ rcar_canfd_global_deinit(gpriv, false);
fail_dev:
return err;
}
@@ -2218,15 +2252,7 @@ static void rcar_canfd_remove(struct platform_device *pdev)
rcar_canfd_channel_remove(gpriv, ch);
}
- rcar_canfd_disable_global_interrupts(gpriv);
- rcar_canfd_reset_controller(gpriv);
-
- /* Enter global sleep mode */
- rcar_canfd_set_bit(gpriv->base, RCANFD_GCTR, RCANFD_GCTR_GSLPR);
- clk_disable_unprepare(gpriv->clk_ram);
- clk_disable_unprepare(gpriv->clkp);
- reset_control_assert(gpriv->rstc2);
- reset_control_assert(gpriv->rstc1);
+ rcar_canfd_global_deinit(gpriv, true);
}
static int __maybe_unused rcar_canfd_suspend(struct device *dev)
--
2.43.0
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