[PATCH 0/2] sh_eth: complain on access to unimplemented TSU registers

[PATCH 0/2] sh_eth: complain on access to unimplemented TSU registers

[Sergei Shtylyov]

Hello!

Here's a set of 2 patches against DaveM's 'net-next.git' repo. The 1st patch
routes TSU_POST<n> register accesses thru sh_eth_tsu_{read|write}() and the 2nd
added WARN_ON() unimplemented register to those functions. I'm going to deal with
TSU_ADR{H|L}<n> registers in a later series...

[1/2] sh_eth: use TSU register accessors for TSU_POST<n>
[2/2] sh_eth: WARN_ON() access to unimplemented TSU register

MBR, Sergei

[PATCH 1/2] sh_eth: use TSU register accessors for TSU_POST<n>

[Sergei Shtylyov]

There's no particularly good reason TSU_POST<n> registers get accessed
circumventing sh_eth_tsu_{read|write}() -- start using those, removing
(badly named) sh_eth_tsu_get_post_reg_offset(),  while at it...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
 drivers/net/ethernet/renesas/sh_eth.c |   20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
=================================--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -2610,12 +2610,6 @@ static int sh_eth_change_mtu(struct net_
 }
 
 /* For TSU_POSTn. Please refer to the manual about this (strange) bitfields */
-static void *sh_eth_tsu_get_post_reg_offset(struct sh_eth_private *mdp,
-					    int entry)
-{
-	return sh_eth_tsu_get_offset(mdp, TSU_POST1) + (entry / 8 * 4);
-}
-
 static u32 sh_eth_tsu_get_post_mask(int entry)
 {
 	return 0x0f << (28 - ((entry % 8) * 4));
@@ -2630,27 +2624,25 @@ static void sh_eth_tsu_enable_cam_entry_
 					     int entry)
 {
 	struct sh_eth_private *mdp = netdev_priv(ndev);
+	int reg = TSU_POST1 + entry / 8;
 	u32 tmp;
-	void *reg_offset;
 
-	reg_offset = sh_eth_tsu_get_post_reg_offset(mdp, entry);
-	tmp = ioread32(reg_offset);
-	iowrite32(tmp | sh_eth_tsu_get_post_bit(mdp, entry), reg_offset);
+	tmp = sh_eth_tsu_read(mdp, reg);
+	sh_eth_tsu_write(mdp, tmp | sh_eth_tsu_get_post_bit(mdp, entry), reg);
 }
 
 static bool sh_eth_tsu_disable_cam_entry_post(struct net_device *ndev,
 					      int entry)
 {
 	struct sh_eth_private *mdp = netdev_priv(ndev);
+	int reg = TSU_POST1 + entry / 8;
 	u32 post_mask, ref_mask, tmp;
-	void *reg_offset;
 
-	reg_offset = sh_eth_tsu_get_post_reg_offset(mdp, entry);
 	post_mask = sh_eth_tsu_get_post_mask(entry);
 	ref_mask = sh_eth_tsu_get_post_bit(mdp, entry) & ~post_mask;
 
-	tmp = ioread32(reg_offset);
-	iowrite32(tmp & ~post_mask, reg_offset);
+	tmp = sh_eth_tsu_read(mdp, reg);
+	sh_eth_tsu_write(mdp, tmp & ~post_mask, reg);
 
 	/* If other port enables, the function returns "true" */
 	return tmp & ref_mask;

[PATCH 2/2] sh_eth: WARN_ON() access to unimplemented TSU register

[Sergei Shtylyov]

Commit 3365711df024 ("sh_eth: WARN on access to a register not implemented
in a particular chip") added  WARN_ON() to sh_eth_{read|write}() but not
to sh_eth_tsu_{read|write}(). Now that we've routed almost all TSU register
accesses  (except TSU_ADR{H|L}<n> -- which are special) thru the latter
pair of accessors, it makes sense to check for the unimplemented TSU
registers as well...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

---
 drivers/net/ethernet/renesas/sh_eth.c |   14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

Index: net-next/drivers/net/ethernet/renesas/sh_eth.c
=================================--- net-next.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net-next/drivers/net/ethernet/renesas/sh_eth.c
@@ -442,12 +442,22 @@ static void sh_eth_modify(struct net_dev
 static void sh_eth_tsu_write(struct sh_eth_private *mdp, u32 data,
 			     int enum_index)
 {
-	iowrite32(data, mdp->tsu_addr + mdp->reg_offset[enum_index]);
+	u16 offset = mdp->reg_offset[enum_index];
+
+	if (WARN_ON(offset = SH_ETH_OFFSET_INVALID))
+		return;
+
+	iowrite32(data, mdp->tsu_addr + offset);
 }
 
 static u32 sh_eth_tsu_read(struct sh_eth_private *mdp, int enum_index)
 {
-	return ioread32(mdp->tsu_addr + mdp->reg_offset[enum_index]);
+	u16 offset = mdp->reg_offset[enum_index];
+
+	if (WARN_ON(offset = SH_ETH_OFFSET_INVALID))
+		return ~0U;
+
+	return ioread32(mdp->tsu_addr + offset);
 }
 
 static void sh_eth_select_mii(struct net_device *ndev)

Re: [PATCH 0/2] sh_eth: complain on access to unimplemented TSU registers

[David Miller]

From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Date: Wed, 2 May 2018 22:53:23 +0300

> Here's a set of 2 patches against DaveM's 'net-next.git' repo. The 1st patch
> routes TSU_POST<n> register accesses thru sh_eth_tsu_{read|write}() and the 2nd
> added WARN_ON() unimplemented register to those functions. I'm going to deal with
> TSU_ADR{H|L}<n> registers in a later series...
> 
> [1/2] sh_eth: use TSU register accessors for TSU_POST<n>
> [2/2] sh_eth: WARN_ON() access to unimplemented TSU register

Series applied to net-next, thanks.