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net: phy: Disable external master access in bcm mdio mux driver

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Configure the scan control register in the Broadcom iProc
mdio mux driver to disable access to external master.

In some SoC's, the scan control register defaults to an incorrect
value.

Signed-off-by: Arun Parameswaran <arun.parameswaran@broadcom.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arun Parameswaran 2018-08-01 17:53:49 -07:00 committed by David S. Miller
parent 18b872d854
commit 5634cb2b37
1 changed files with 15 additions and 0 deletions
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15
drivers/net/phy/mdio-mux-bcm-iproc.c
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@ -22,6 +22,9 @@
#include <linux/mdio-mux.h>
#include <linux/delay.h>
#define MDIO_SCAN_CTRL_OFFSET 0x008
#define MDIO_SCAN_CTRL_OVRIDE_EXT_MSTR 28
#define MDIO_PARAM_OFFSET 0x23c
#define MDIO_PARAM_MIIM_CYCLE 29
#define MDIO_PARAM_INTERNAL_SEL 25
@ -53,6 +56,16 @@ struct iproc_mdiomux_desc {
struct mii_bus *mii_bus;
};
static void mdio_mux_iproc_config(struct iproc_mdiomux_desc *md)
{
u32 val;
/* Disable external mdio master access */
val = readl(md->base + MDIO_SCAN_CTRL_OFFSET);
val |= BIT(MDIO_SCAN_CTRL_OVRIDE_EXT_MSTR);
writel(val, md->base + MDIO_SCAN_CTRL_OFFSET);
}
static int iproc_mdio_wait_for_idle(void __iomem *base, bool result)
{
unsigned int timeout = 1000; /* loop for 1s */
@ -216,6 +229,8 @@ static int mdio_mux_iproc_probe(struct platform_device *pdev)
goto out_register;
}
mdio_mux_iproc_config(md);
dev_info(md->dev, "iProc mdiomux registered\n");
return 0;