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ibm_newemac: Fix EMAC soft reset on 460EX/GT

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This patch fixes EMAC soft reset on 460EX/GT when no external clock is
available.

Signed-off-by: Victor Gallardo <vgallardo@amcc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Victor Gallardo 2008-09-18 12:41:26 +00:00 committed by David S. Miller
parent c6d6a511d7
commit 6fbc779c03
3 changed files with 27 additions and 0 deletions
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4
arch/powerpc/include/asm/dcr-regs.h
View file

@ -68,6 +68,10 @@
#define SDR0_UART3 0x0123
#define SDR0_CUST0 0x4000
/* SDRs (460EX/460GT) */
#define SDR0_ETH_CFG 0x4103
#define SDR0_ETH_CFG_ECS 0x00000100 /* EMAC int clk source */
/*
* All those DCR register addresses are offsets from the base address
* for the SRAM0 controller (e.g. 0x20 on 440GX). The base address is

18
drivers/net/ibm_newemac/core.c
View file

@ -130,6 +130,7 @@ static inline void emac_report_timeout_error(struct emac_instance *dev,
const char *error)
{
if (emac_has_feature(dev, EMAC_FTR_440GX_PHY_CLK_FIX |
EMAC_FTR_460EX_PHY_CLK_FIX |
EMAC_FTR_440EP_PHY_CLK_FIX))
DBG(dev, "%s" NL, error);
else if (net_ratelimit())
@ -351,10 +352,24 @@ static int emac_reset(struct emac_instance *dev)
emac_tx_disable(dev);
}
#ifdef CONFIG_PPC_DCR_NATIVE
/* Enable internal clock source */
if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX))
dcri_clrset(SDR0, SDR0_ETH_CFG,
0, SDR0_ETH_CFG_ECS << dev->cell_index);
#endif
out_be32(&p->mr0, EMAC_MR0_SRST);
while ((in_be32(&p->mr0) & EMAC_MR0_SRST) && n)
--n;
#ifdef CONFIG_PPC_DCR_NATIVE
/* Enable external clock source */
if (emac_has_feature(dev, EMAC_FTR_460EX_PHY_CLK_FIX))
dcri_clrset(SDR0, SDR0_ETH_CFG,
SDR0_ETH_CFG_ECS << dev->cell_index, 0);
#endif
if (n) {
dev->reset_failed = 0;
return 0;
@ -2559,6 +2574,9 @@ static int __devinit emac_init_config(struct emac_instance *dev)
/* Check EMAC version */
if (of_device_is_compatible(np, "ibm,emac4sync")) {
dev->features |= (EMAC_FTR_EMAC4 | EMAC_FTR_EMAC4SYNC);
if (of_device_is_compatible(np, "ibm,emac-460ex") ||
of_device_is_compatible(np, "ibm,emac-460gt"))
dev->features |= EMAC_FTR_460EX_PHY_CLK_FIX;
} else if (of_device_is_compatible(np, "ibm,emac4")) {
dev->features |= EMAC_FTR_EMAC4;
if (of_device_is_compatible(np, "ibm,emac-440gx"))

5
drivers/net/ibm_newemac/core.h
View file

@ -317,6 +317,10 @@ struct emac_instance {
* The 405EX and 460EX contain the EMAC4SYNC core
*/
#define EMAC_FTR_EMAC4SYNC 0x00000200
/*
* Set if we need phy clock workaround for 460ex or 460gt
*/
#define EMAC_FTR_460EX_PHY_CLK_FIX 0x00000400
/* Right now, we don't quite handle the always/possible masks on the
@ -341,6 +345,7 @@ enum {
#ifdef CONFIG_IBM_NEW_EMAC_RGMII
EMAC_FTR_HAS_RGMII |
#endif
EMAC_FTR_460EX_PHY_CLK_FIX |
EMAC_FTR_440EP_PHY_CLK_FIX,
};