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fsl/fman: Workaround for Errata A-007273 

Errata A-007273 (For FMan V3 devices only):
FMan soft reset is not finished properly if one
of the Ethernet MAC clocks is disabled

Workaround:
Re-enable all disabled MAC clocks through the DCFG_CCSR_DEVDISR2
register prior to issuing an FMAN soft reset.
Re-disable the MAC clocks after the FMAN soft reset is done.

Signed-off-by: Igal Liberman <igal.liberman@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Igal Liberman 2016-03-21 23:08:11 +02:00 committed by David S. Miller
parent ad0ea1989c
commit 6e9bdc7271
1 changed files with 88 additions and 16 deletions
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104
drivers/net/ethernet/freescale/fman/fman.c
View File

@ -35,6 +35,7 @@
#include "fman.h"
#include "fman_muram.h"
#include <linux/fsl/guts.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/module.h>
@ -1871,6 +1872,90 @@ err_fm_state:
return -EINVAL;
}
static int fman_reset(struct fman *fman)
{
u32 count;
int err = 0;
if (fman->state->rev_info.major < 6) {
iowrite32be(FPM_RSTC_FM_RESET, &fman->fpm_regs->fm_rstc);
/* Wait for reset completion */
count = 100;
do {
udelay(1);
} while (((ioread32be(&fman->fpm_regs->fm_rstc)) &
FPM_RSTC_FM_RESET) && --count);
if (count == 0)
err = -EBUSY;
goto _return;
} else {
struct device_node *guts_node;
struct ccsr_guts __iomem *guts_regs;
u32 devdisr2, reg;
/* Errata A007273 */
guts_node =
of_find_compatible_node(NULL, NULL,
"fsl,qoriq-device-config-2.0");
if (!guts_node) {
dev_err(fman->dev, "%s: Couldn't find guts node\n",
__func__);
goto guts_node;
}
guts_regs = of_iomap(guts_node, 0);
if (!guts_regs) {
dev_err(fman->dev, "%s: Couldn't map %s regs\n",
__func__, guts_node->full_name);
goto guts_regs;
}
#define FMAN1_ALL_MACS_MASK 0xFCC00000
#define FMAN2_ALL_MACS_MASK 0x000FCC00
/* Read current state */
devdisr2 = ioread32be(&guts_regs->devdisr2);
if (fman->dts_params.id == 0)
reg = devdisr2 & ~FMAN1_ALL_MACS_MASK;
else
reg = devdisr2 & ~FMAN2_ALL_MACS_MASK;
/* Enable all MACs */
iowrite32be(reg, &guts_regs->devdisr2);
/* Perform FMan reset */
iowrite32be(FPM_RSTC_FM_RESET, &fman->fpm_regs->fm_rstc);
/* Wait for reset completion */
count = 100;
do {
udelay(1);
} while (((ioread32be(&fman->fpm_regs->fm_rstc)) &
FPM_RSTC_FM_RESET) && --count);
if (count == 0) {
iounmap(guts_regs);
of_node_put(guts_node);
err = -EBUSY;
goto _return;
}
/* Restore devdisr2 value */
iowrite32be(devdisr2, &guts_regs->devdisr2);
iounmap(guts_regs);
of_node_put(guts_node);
goto _return;
guts_regs:
of_node_put(guts_node);
guts_node:
dev_dbg(fman->dev, "%s: Didn't perform FManV3 reset due to Errata A007273!\n",
__func__);
}
_return:
return err;
}
static int fman_init(struct fman *fman)
{
struct fman_cfg *cfg = NULL;
@ -1914,22 +1999,9 @@ static int fman_init(struct fman *fman)
fman->liodn_base[i] = liodn_base;
}
/* FMan Reset (supported only for FMan V2) */
if (fman->state->rev_info.major >= 6) {
/* Errata A007273 */
dev_dbg(fman->dev, "%s: FManV3 reset is not supported!\n",
__func__);
} else {
iowrite32be(FPM_RSTC_FM_RESET, &fman->fpm_regs->fm_rstc);
/* Wait for reset completion */
count = 100;
do {
udelay(1);
} while (((ioread32be(&fman->fpm_regs->fm_rstc)) &
FPM_RSTC_FM_RESET) && --count);
if (count == 0)
return -EBUSY;
}
err = fman_reset(fman);
if (err)
return err;
if (ioread32be(&fman->qmi_regs->fmqm_gs) & QMI_GS_HALT_NOT_BUSY) {
resume(fman->fpm_regs);