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Message-ID: <3447960.Sfp8MfyPX3@wasted.cogentembedded.com>
Date: Wed, 10 Feb 2016 01:37:44 +0300
From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To: netdev@...r.kernel.org
Cc: linux-renesas-soc@...r.kernel.org
Subject: [PATCH v2 1/2] ravb: factor out register bit twiddling code
The driver has often repeated pattern of reading a register, AND'ing and/or
OR'ing some bits and writing the value back. Factor the pattern out into
ravb_modify() -- this saves 260 bytes of code with ARM gcc 4.7.3.
While at it, update Cogent Embedded's copyrights.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
---
Changes in version 2:
- renamed ravb_modify()'s parameters.
drivers/net/ethernet/renesas/ravb.h | 4 +
drivers/net/ethernet/renesas/ravb_main.c | 68 ++++++++++++-------------------
drivers/net/ethernet/renesas/ravb_ptp.c | 25 ++---------
3 files changed, 36 insertions(+), 61 deletions(-)
Index: net-next/drivers/net/ethernet/renesas/ravb.h
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/ravb.h
+++ net-next/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@...entembedded.com>
+ * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@...entembedded.com>
*
* Based on the SuperH Ethernet driver
*
@@ -837,6 +837,8 @@ static inline void ravb_write(struct net
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);
Index: net-next/drivers/net/ethernet/renesas/ravb_main.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/ravb_main.c
+++ net-next/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@...entembedded.com>
+ * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@...entembedded.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
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
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)
@@ -131,13 +131,8 @@ static void ravb_mdio_ctrl(struct mdiobb
{
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 +388,9 @@ static int ravb_dmac_init(struct net_dev
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 +413,7 @@ static int ravb_dmac_init(struct net_dev
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 +487,7 @@ static void ravb_get_tx_tstamp(struct ne
break;
}
}
- ravb_write(ndev, ravb_read(ndev, TCCR) | TCCR_TFR, TCCR);
+ ravb_modify(ndev, TCCR, TCCR_TFR, TCCR_TFR);
}
}
@@ -613,13 +607,13 @@ static bool ravb_rx(struct net_device *n
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 +806,8 @@ static int ravb_poll(struct napi_struct
/* 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 +846,7 @@ static void ravb_adjust_link(struct net_
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)
@@ -1393,7 +1386,7 @@ static netdev_tx_t ravb_start_xmit(struc
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 +1461,10 @@ static void ravb_set_rx_mode(struct net_
{
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);
}
@@ -1804,14 +1792,12 @@ static int ravb_probe(struct platform_de
/* 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 */
@@ -1824,7 +1810,7 @@ static int ravb_probe(struct platform_de
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;
Index: net-next/drivers/net/ethernet/renesas/ravb_ptp.c
===================================================================
--- net-next.orig/drivers/net/ethernet/renesas/ravb_ptp.c
+++ net-next/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@...entembedded.com>
+ * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@...entembedded.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 r
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_clo
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_clo
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_cl
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_cl
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_cl
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 *nd
{
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 *nd
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);
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