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-rw-r--r--drivers/net/ethernet/renesas/ravb.h4
-rw-r--r--drivers/net/ethernet/renesas/ravb_main.c86
-rw-r--r--drivers/net/ethernet/renesas/ravb_ptp.c25
-rw-r--r--drivers/net/ethernet/renesas/sh_eth.c65
4 files changed, 68 insertions, 112 deletions
diff --git a/drivers/net/ethernet/renesas/ravb.h b/drivers/net/ethernet/renesas/ravb.h
index 9fbe92ac225b..b2160d1b9c71 100644
--- a/drivers/net/ethernet/renesas/ravb.h
+++ b/drivers/net/ethernet/renesas/ravb.h
@@ -2,7 +2,7 @@
*
* Copyright (C) 2014-2015 Renesas Electronics Corporation
* Copyright (C) 2015 Renesas Solutions Corp.
- * Copyright (C) 2015 Cogent Embedded, Inc. <source@cogentembedded.com>
+ * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@cogentembedded.com>
*
* Based on the SuperH Ethernet driver
*
@@ -837,6 +837,8 @@ static inline void ravb_write(struct net_device *ndev, u32 data,
iowrite32(data, priv->addr + reg);
}
+void ravb_modify(struct net_device *ndev, enum ravb_reg reg, u32 clear,
+ u32 set);
int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value);
irqreturn_t ravb_ptp_interrupt(struct net_device *ndev);
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index ac43ed914fcf..88656ceb6e29 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -2,7 +2,7 @@
*
* Copyright (C) 2014-2015 Renesas Electronics Corporation
* Copyright (C) 2015 Renesas Solutions Corp.
- * Copyright (C) 2015 Cogent Embedded, Inc. <source@cogentembedded.com>
+ * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@cogentembedded.com>
*
* Based on the SuperH Ethernet driver
*
@@ -42,6 +42,12 @@
NETIF_MSG_RX_ERR | \
NETIF_MSG_TX_ERR)
+void ravb_modify(struct net_device *ndev, enum ravb_reg reg, u32 clear,
+ u32 set)
+{
+ ravb_write(ndev, (ravb_read(ndev, reg) & ~clear) | set, reg);
+}
+
int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value)
{
int i;
@@ -59,8 +65,7 @@ static int ravb_config(struct net_device *ndev)
int error;
/* Set config mode */
- ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_CONFIG,
- CCC);
+ ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG);
/* Check if the operating mode is changed to the config mode */
error = ravb_wait(ndev, CSR, CSR_OPS, CSR_OPS_CONFIG);
if (error)
@@ -72,13 +77,8 @@ static int ravb_config(struct net_device *ndev)
static void ravb_set_duplex(struct net_device *ndev)
{
struct ravb_private *priv = netdev_priv(ndev);
- u32 ecmr = ravb_read(ndev, ECMR);
- if (priv->duplex) /* Full */
- ecmr |= ECMR_DM;
- else /* Half */
- ecmr &= ~ECMR_DM;
- ravb_write(ndev, ecmr, ECMR);
+ ravb_modify(ndev, ECMR, ECMR_DM, priv->duplex ? ECMR_DM : 0);
}
static void ravb_set_rate(struct net_device *ndev)
@@ -92,8 +92,6 @@ static void ravb_set_rate(struct net_device *ndev)
case 1000: /* 1000BASE */
ravb_write(ndev, GECMR_SPEED_1000, GECMR);
break;
- default:
- break;
}
}
@@ -131,13 +129,8 @@ static void ravb_mdio_ctrl(struct mdiobb_ctrl *ctrl, u32 mask, int set)
{
struct ravb_private *priv = container_of(ctrl, struct ravb_private,
mdiobb);
- u32 pir = ravb_read(priv->ndev, PIR);
- if (set)
- pir |= mask;
- else
- pir &= ~mask;
- ravb_write(priv->ndev, pir, PIR);
+ ravb_modify(priv->ndev, PIR, mask, set ? mask : 0);
}
/* MDC pin control */
@@ -393,9 +386,9 @@ static int ravb_dmac_init(struct net_device *ndev)
ravb_ring_format(ndev, RAVB_NC);
#if defined(__LITTLE_ENDIAN)
- ravb_write(ndev, ravb_read(ndev, CCC) & ~CCC_BOC, CCC);
+ ravb_modify(ndev, CCC, CCC_BOC, 0);
#else
- ravb_write(ndev, ravb_read(ndev, CCC) | CCC_BOC, CCC);
+ ravb_modify(ndev, CCC, CCC_BOC, CCC_BOC);
#endif
/* Set AVB RX */
@@ -418,8 +411,7 @@ static int ravb_dmac_init(struct net_device *ndev)
ravb_write(ndev, TIC_FTE0 | TIC_FTE1 | TIC_TFUE, TIC);
/* Setting the control will start the AVB-DMAC process. */
- ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_OPERATION,
- CCC);
+ ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_OPERATION);
return 0;
}
@@ -493,7 +485,7 @@ static void ravb_get_tx_tstamp(struct net_device *ndev)
break;
}
}
- ravb_write(ndev, ravb_read(ndev, TCCR) | TCCR_TFR, TCCR);
+ ravb_modify(ndev, TCCR, TCCR_TFR, TCCR_TFR);
}
}
@@ -613,13 +605,13 @@ static bool ravb_rx(struct net_device *ndev, int *quota, int q)
static void ravb_rcv_snd_disable(struct net_device *ndev)
{
/* Disable TX and RX */
- ravb_write(ndev, ravb_read(ndev, ECMR) & ~(ECMR_RE | ECMR_TE), ECMR);
+ ravb_modify(ndev, ECMR, ECMR_RE | ECMR_TE, 0);
}
static void ravb_rcv_snd_enable(struct net_device *ndev)
{
/* Enable TX and RX */
- ravb_write(ndev, ravb_read(ndev, ECMR) | ECMR_RE | ECMR_TE, ECMR);
+ ravb_modify(ndev, ECMR, ECMR_RE | ECMR_TE, ECMR_RE | ECMR_TE);
}
/* function for waiting dma process finished */
@@ -812,8 +804,8 @@ static int ravb_poll(struct napi_struct *napi, int budget)
/* Re-enable RX/TX interrupts */
spin_lock_irqsave(&priv->lock, flags);
- ravb_write(ndev, ravb_read(ndev, RIC0) | mask, RIC0);
- ravb_write(ndev, ravb_read(ndev, TIC) | mask, TIC);
+ ravb_modify(ndev, RIC0, mask, mask);
+ ravb_modify(ndev, TIC, mask, mask);
mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
@@ -852,8 +844,7 @@ static void ravb_adjust_link(struct net_device *ndev)
ravb_set_rate(ndev);
}
if (!priv->link) {
- ravb_write(ndev, ravb_read(ndev, ECMR) & ~ECMR_TXF,
- ECMR);
+ ravb_modify(ndev, ECMR, ECMR_TXF, 0);
new_state = true;
priv->link = phydev->link;
if (priv->no_avb_link)
@@ -1139,7 +1130,8 @@ static int ravb_set_ringparam(struct net_device *ndev,
if (netif_running(ndev)) {
netif_device_detach(ndev);
/* Stop PTP Clock driver */
- ravb_ptp_stop(ndev);
+ if (priv->chip_id == RCAR_GEN2)
+ ravb_ptp_stop(ndev);
/* Wait for DMA stopping */
error = ravb_stop_dma(ndev);
if (error) {
@@ -1170,7 +1162,8 @@ static int ravb_set_ringparam(struct net_device *ndev,
ravb_emac_init(ndev);
/* Initialise PTP Clock driver */
- ravb_ptp_init(ndev, priv->pdev);
+ if (priv->chip_id == RCAR_GEN2)
+ ravb_ptp_init(ndev, priv->pdev);
netif_device_attach(ndev);
}
@@ -1298,7 +1291,8 @@ static void ravb_tx_timeout_work(struct work_struct *work)
netif_tx_stop_all_queues(ndev);
/* Stop PTP Clock driver */
- ravb_ptp_stop(ndev);
+ if (priv->chip_id == RCAR_GEN2)
+ ravb_ptp_stop(ndev);
/* Wait for DMA stopping */
ravb_stop_dma(ndev);
@@ -1311,7 +1305,8 @@ static void ravb_tx_timeout_work(struct work_struct *work)
ravb_emac_init(ndev);
/* Initialise PTP Clock driver */
- ravb_ptp_init(ndev, priv->pdev);
+ if (priv->chip_id == RCAR_GEN2)
+ ravb_ptp_init(ndev, priv->pdev);
netif_tx_start_all_queues(ndev);
}
@@ -1393,7 +1388,7 @@ static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev)
desc--;
desc->die_dt = DT_FSTART;
- ravb_write(ndev, ravb_read(ndev, TCCR) | (TCCR_TSRQ0 << q), TCCR);
+ ravb_modify(ndev, TCCR, TCCR_TSRQ0 << q, TCCR_TSRQ0 << q);
priv->cur_tx[q] += NUM_TX_DESC;
if (priv->cur_tx[q] - priv->dirty_tx[q] >
@@ -1468,15 +1463,10 @@ static void ravb_set_rx_mode(struct net_device *ndev)
{
struct ravb_private *priv = netdev_priv(ndev);
unsigned long flags;
- u32 ecmr;
spin_lock_irqsave(&priv->lock, flags);
- ecmr = ravb_read(ndev, ECMR);
- if (ndev->flags & IFF_PROMISC)
- ecmr |= ECMR_PRM;
- else
- ecmr &= ~ECMR_PRM;
- ravb_write(ndev, ecmr, ECMR);
+ ravb_modify(ndev, ECMR, ECMR_PRM,
+ ndev->flags & IFF_PROMISC ? ECMR_PRM : 0);
mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
}
@@ -1804,27 +1794,21 @@ static int ravb_probe(struct platform_device *pdev)
/* Set AVB config mode */
if (chip_id == RCAR_GEN2) {
- ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) |
- CCC_OPC_CONFIG, CCC);
+ ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG);
/* Set CSEL value */
- ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_CSEL) |
- CCC_CSEL_HPB, CCC);
+ ravb_modify(ndev, CCC, CCC_CSEL, CCC_CSEL_HPB);
} else {
- ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) |
- CCC_OPC_CONFIG | CCC_GAC | CCC_CSEL_HPB, CCC);
+ ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG |
+ CCC_GAC | CCC_CSEL_HPB);
}
- /* Set CSEL value */
- ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_CSEL) | CCC_CSEL_HPB,
- CCC);
-
/* Set GTI value */
error = ravb_set_gti(ndev);
if (error)
goto out_release;
/* Request GTI loading */
- ravb_write(ndev, ravb_read(ndev, GCCR) | GCCR_LTI, GCCR);
+ ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI);
/* Allocate descriptor base address table */
priv->desc_bat_size = sizeof(struct ravb_desc) * DBAT_ENTRY_NUM;
diff --git a/drivers/net/ethernet/renesas/ravb_ptp.c b/drivers/net/ethernet/renesas/ravb_ptp.c
index 7a8ce920c49e..57992ccc4657 100644
--- a/drivers/net/ethernet/renesas/ravb_ptp.c
+++ b/drivers/net/ethernet/renesas/ravb_ptp.c
@@ -2,7 +2,7 @@
*
* Copyright (C) 2013-2015 Renesas Electronics Corporation
* Copyright (C) 2015 Renesas Solutions Corp.
- * Copyright (C) 2015 Cogent Embedded, Inc. <source@cogentembedded.com>
+ * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@cogentembedded.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -21,7 +21,7 @@ static int ravb_ptp_tcr_request(struct ravb_private *priv, u32 request)
if (error)
return error;
- ravb_write(ndev, ravb_read(ndev, GCCR) | request, GCCR);
+ ravb_modify(ndev, GCCR, request, request);
return ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
}
@@ -185,7 +185,6 @@ static int ravb_ptp_extts(struct ptp_clock_info *ptp,
ptp.info);
struct net_device *ndev = priv->ndev;
unsigned long flags;
- u32 gic;
if (req->index)
return -EINVAL;
@@ -195,12 +194,7 @@ static int ravb_ptp_extts(struct ptp_clock_info *ptp,
priv->ptp.extts[req->index] = on;
spin_lock_irqsave(&priv->lock, flags);
- gic = ravb_read(ndev, GIC);
- if (on)
- gic |= GIC_PTCE;
- else
- gic &= ~GIC_PTCE;
- ravb_write(ndev, gic, GIC);
+ ravb_modify(ndev, GIC, GIC_PTCE, on ? GIC_PTCE : 0);
mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
@@ -216,7 +210,6 @@ static int ravb_ptp_perout(struct ptp_clock_info *ptp,
struct ravb_ptp_perout *perout;
unsigned long flags;
int error = 0;
- u32 gic;
if (req->index)
return -EINVAL;
@@ -248,9 +241,7 @@ static int ravb_ptp_perout(struct ptp_clock_info *ptp,
error = ravb_ptp_update_compare(priv, (u32)start_ns);
if (!error) {
/* Unmask interrupt */
- gic = ravb_read(ndev, GIC);
- gic |= GIC_PTME;
- ravb_write(ndev, gic, GIC);
+ ravb_modify(ndev, GIC, GIC_PTME, GIC_PTME);
}
} else {
spin_lock_irqsave(&priv->lock, flags);
@@ -259,9 +250,7 @@ static int ravb_ptp_perout(struct ptp_clock_info *ptp,
perout->period = 0;
/* Mask interrupt */
- gic = ravb_read(ndev, GIC);
- gic &= ~GIC_PTME;
- ravb_write(ndev, gic, GIC);
+ ravb_modify(ndev, GIC, GIC_PTME, 0);
}
mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
@@ -331,7 +320,6 @@ void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev)
{
struct ravb_private *priv = netdev_priv(ndev);
unsigned long flags;
- u32 gccr;
priv->ptp.info = ravb_ptp_info;
@@ -340,8 +328,7 @@ void ravb_ptp_init(struct net_device *ndev, struct platform_device *pdev)
spin_lock_irqsave(&priv->lock, flags);
ravb_wait(ndev, GCCR, GCCR_TCR, GCCR_TCR_NOREQ);
- gccr = ravb_read(ndev, GCCR) & ~GCCR_TCSS;
- ravb_write(ndev, gccr | GCCR_TCSS_ADJGPTP, GCCR);
+ ravb_modify(ndev, GCCR, GCCR_TCSS, GCCR_TCSS_ADJGPTP);
mmiowb();
spin_unlock_irqrestore(&priv->lock, flags);
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index dfa9e59c9442..a2767336b7c5 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -3,7 +3,7 @@
* Copyright (C) 2014 Renesas Electronics Corporation
* Copyright (C) 2006-2012 Nobuhiro Iwamatsu
* Copyright (C) 2008-2014 Renesas Solutions Corp.
- * Copyright (C) 2013-2014 Cogent Embedded, Inc.
+ * Copyright (C) 2013-2016 Cogent Embedded, Inc.
* Copyright (C) 2014 Codethink Limited
*
* This program is free software; you can redistribute it and/or modify it
@@ -428,6 +428,13 @@ static u32 sh_eth_read(struct net_device *ndev, int enum_index)
return ioread32(mdp->addr + offset);
}
+static void sh_eth_modify(struct net_device *ndev, int enum_index, u32 clear,
+ u32 set)
+{
+ sh_eth_write(ndev, (sh_eth_read(ndev, enum_index) & ~clear) | set,
+ enum_index);
+}
+
static bool sh_eth_is_gether(struct sh_eth_private *mdp)
{
return mdp->reg_offset == sh_eth_offset_gigabit;
@@ -467,10 +474,7 @@ static void sh_eth_set_duplex(struct net_device *ndev)
{
struct sh_eth_private *mdp = netdev_priv(ndev);
- if (mdp->duplex) /* Full */
- sh_eth_write(ndev, sh_eth_read(ndev, ECMR) | ECMR_DM, ECMR);
- else /* Half */
- sh_eth_write(ndev, sh_eth_read(ndev, ECMR) & ~ECMR_DM, ECMR);
+ sh_eth_modify(ndev, ECMR, ECMR_DM, mdp->duplex ? ECMR_DM : 0);
}
static void sh_eth_chip_reset(struct net_device *ndev)
@@ -496,8 +500,6 @@ static void sh_eth_set_rate_gether(struct net_device *ndev)
case 1000: /* 1000BASE */
sh_eth_write(ndev, GECMR_1000, GECMR);
break;
- default:
- break;
}
}
@@ -583,12 +585,10 @@ static void sh_eth_set_rate_r8a777x(struct net_device *ndev)
switch (mdp->speed) {
case 10: /* 10BASE */
- sh_eth_write(ndev, sh_eth_read(ndev, ECMR) & ~ECMR_ELB, ECMR);
+ sh_eth_modify(ndev, ECMR, ECMR_ELB, 0);
break;
case 100:/* 100BASE */
- sh_eth_write(ndev, sh_eth_read(ndev, ECMR) | ECMR_ELB, ECMR);
- break;
- default:
+ sh_eth_modify(ndev, ECMR, ECMR_ELB, ECMR_ELB);
break;
}
}
@@ -649,12 +649,10 @@ static void sh_eth_set_rate_sh7724(struct net_device *ndev)
switch (mdp->speed) {
case 10: /* 10BASE */
- sh_eth_write(ndev, sh_eth_read(ndev, ECMR) & ~ECMR_RTM, ECMR);
+ sh_eth_modify(ndev, ECMR, ECMR_RTM, 0);
break;
case 100:/* 100BASE */
- sh_eth_write(ndev, sh_eth_read(ndev, ECMR) | ECMR_RTM, ECMR);
- break;
- default:
+ sh_eth_modify(ndev, ECMR, ECMR_RTM, ECMR_RTM);
break;
}
}
@@ -694,8 +692,6 @@ static void sh_eth_set_rate_sh7757(struct net_device *ndev)
case 100:/* 100BASE */
sh_eth_write(ndev, 1, RTRATE);
break;
- default:
- break;
}
}
@@ -763,8 +759,6 @@ static void sh_eth_set_rate_giga(struct net_device *ndev)
case 1000: /* 1000BASE */
sh_eth_write(ndev, 0x00000020, GECMR);
break;
- default:
- break;
}
}
@@ -924,8 +918,7 @@ static int sh_eth_reset(struct net_device *ndev)
if (sh_eth_is_gether(mdp) || sh_eth_is_rz_fast_ether(mdp)) {
sh_eth_write(ndev, EDSR_ENALL, EDSR);
- sh_eth_write(ndev, sh_eth_read(ndev, EDMR) | EDMR_SRST_GETHER,
- EDMR);
+ sh_eth_modify(ndev, EDMR, EDMR_SRST_GETHER, EDMR_SRST_GETHER);
ret = sh_eth_check_reset(ndev);
if (ret)
@@ -949,11 +942,9 @@ static int sh_eth_reset(struct net_device *ndev)
if (mdp->cd->select_mii)
sh_eth_select_mii(ndev);
} else {
- sh_eth_write(ndev, sh_eth_read(ndev, EDMR) | EDMR_SRST_ETHER,
- EDMR);
+ sh_eth_modify(ndev, EDMR, EDMR_SRST_ETHER, EDMR_SRST_ETHER);
mdelay(3);
- sh_eth_write(ndev, sh_eth_read(ndev, EDMR) & ~EDMR_SRST_ETHER,
- EDMR);
+ sh_eth_modify(ndev, EDMR, EDMR_SRST_ETHER, 0);
}
return ret;
@@ -1285,7 +1276,7 @@ static int sh_eth_dev_init(struct net_device *ndev, bool start)
sh_eth_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN,
RFLR);
- sh_eth_write(ndev, sh_eth_read(ndev, EESR), EESR);
+ sh_eth_modify(ndev, EESR, 0, 0);
if (start) {
mdp->irq_enabled = true;
sh_eth_write(ndev, mdp->cd->eesipr_value, EESIPR);
@@ -1532,15 +1523,13 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status, int *quota)
static void sh_eth_rcv_snd_disable(struct net_device *ndev)
{
/* disable tx and rx */
- sh_eth_write(ndev, sh_eth_read(ndev, ECMR) &
- ~(ECMR_RE | ECMR_TE), ECMR);
+ sh_eth_modify(ndev, ECMR, ECMR_RE | ECMR_TE, 0);
}
static void sh_eth_rcv_snd_enable(struct net_device *ndev)
{
/* enable tx and rx */
- sh_eth_write(ndev, sh_eth_read(ndev, ECMR) |
- (ECMR_RE | ECMR_TE), ECMR);
+ sh_eth_modify(ndev, ECMR, ECMR_RE | ECMR_TE, ECMR_RE | ECMR_TE);
}
/* error control function */
@@ -1569,13 +1558,11 @@ static void sh_eth_error(struct net_device *ndev, u32 intr_status)
sh_eth_rcv_snd_disable(ndev);
} else {
/* Link Up */
- sh_eth_write(ndev, sh_eth_read(ndev, EESIPR) &
- ~DMAC_M_ECI, EESIPR);
+ sh_eth_modify(ndev, EESIPR, DMAC_M_ECI, 0);
/* clear int */
- sh_eth_write(ndev, sh_eth_read(ndev, ECSR),
- ECSR);
- sh_eth_write(ndev, sh_eth_read(ndev, EESIPR) |
- DMAC_M_ECI, EESIPR);
+ sh_eth_modify(ndev, ECSR, 0, 0);
+ sh_eth_modify(ndev, EESIPR, DMAC_M_ECI,
+ DMAC_M_ECI);
/* enable tx and rx */
sh_eth_rcv_snd_enable(ndev);
}
@@ -1765,9 +1752,7 @@ static void sh_eth_adjust_link(struct net_device *ndev)
mdp->cd->set_rate(ndev);
}
if (!mdp->link) {
- sh_eth_write(ndev,
- sh_eth_read(ndev, ECMR) & ~ECMR_TXF,
- ECMR);
+ sh_eth_modify(ndev, ECMR, ECMR_TXF, 0);
new_state = 1;
mdp->link = phydev->link;
if (mdp->cd->no_psr || mdp->no_ether_link)
@@ -2922,8 +2907,6 @@ static const u16 *sh_eth_get_register_offset(int register_type)
case SH_ETH_REG_FAST_SH3_SH2:
reg_offset = sh_eth_offset_fast_sh3_sh2;
break;
- default:
- break;
}
return reg_offset;