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Subject[PATCH 4.14 465/496] sh_eth: fix TSU init on SH7734/R8A7740
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

[ Upstream commit a94cf2a614f8bc5b2b33c708626ce695bf71e424 ]

It appears that the single port Ether controllers having TSU (like SH7734/
R8A7740) need the same kind of treating in sh_eth_tsu_init() as R7S72100
currently has -- they also don't have the TSU registers related e.g. to
passing the frames between ports. Add the 'sh_eth_cpu_data::dual_port'
flag and use it as a new criterion for taking a "short path" in the TSU
init sequence in order to avoid writing to the non-existent registers...

Fixes: f0e81fecd4f8 ("net: sh_eth: Add support SH7734")
Fixes: 73a0d907301e ("net: sh_eth: add support R8A7740")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/renesas/sh_eth.c | 6 +++++-
drivers/net/ethernet/renesas/sh_eth.h | 1 +
2 files changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -753,6 +753,7 @@ static struct sh_eth_cpu_data sh7757_dat
.rpadir = 1,
.rpadir_value = 2 << 16,
.rtrate = 1,
+ .dual_port = 1,
};

#define SH_GIGA_ETH_BASE 0xfee00000UL
@@ -831,6 +832,7 @@ static struct sh_eth_cpu_data sh7757_dat
.no_trimd = 1,
.no_ade = 1,
.tsu = 1,
+ .dual_port = 1,
};

/* SH7734 */
@@ -901,6 +903,7 @@ static struct sh_eth_cpu_data sh7763_dat
.tsu = 1,
.irq_flags = IRQF_SHARED,
.magic = 1,
+ .dual_port = 1,
};

static struct sh_eth_cpu_data sh7619_data = {
@@ -933,6 +936,7 @@ static struct sh_eth_cpu_data sh771x_dat
EESIPR_RRFIP | EESIPR_RTLFIP | EESIPR_RTSFIP |
EESIPR_PREIP | EESIPR_CERFIP,
.tsu = 1,
+ .dual_port = 1,
};

static void sh_eth_set_default_cpu_data(struct sh_eth_cpu_data *cd)
@@ -2911,7 +2915,7 @@ static int sh_eth_vlan_rx_kill_vid(struc
/* SuperH's TSU register init function */
static void sh_eth_tsu_init(struct sh_eth_private *mdp)
{
- if (sh_eth_is_rz_fast_ether(mdp)) {
+ if (!mdp->cd->dual_port) {
sh_eth_tsu_write(mdp, 0, TSU_TEN); /* Disable all CAM entry */
sh_eth_tsu_write(mdp, TSU_FWSLC_POSTENU | TSU_FWSLC_POSTENL,
TSU_FWSLC); /* Enable POST registers */
--- a/drivers/net/ethernet/renesas/sh_eth.h
+++ b/drivers/net/ethernet/renesas/sh_eth.h
@@ -509,6 +509,7 @@ struct sh_eth_cpu_data {
unsigned rmiimode:1; /* EtherC has RMIIMODE register */
unsigned rtrate:1; /* EtherC has RTRATE register */
unsigned magic:1; /* EtherC has ECMR.MPDE and ECSR.MPD */
+ unsigned dual_port:1; /* Dual EtherC/E-DMAC */
};

struct sh_eth_private {

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