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ARM: stm32: Add additional ID register check for KSZ8851 presence 

Currently the code sets eth1addr only if /ethernet1 alias exists in DT,
the node pointed to by the alias has "micrel,ks8851-mll" compatible
string, and the KSZ8851 CCR register read indicates programmed EEPROM
is not connected.

This is not sufficient to detect cases where the DT still contains the
KSZ8851 nodes, but the chip itself is not present. Extend the detection
to handle these cases.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
This commit is contained in:
Marek Vasut 2021-05-03 13:31:39 +02:00 committed by Patrick Delaunay
parent 5c38c06ec0
commit 5c54260130
1 changed files with 10 additions and 1 deletions
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11
board/dhelectronics/dh_stm32mp1/board.c
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@ -86,6 +86,8 @@ DECLARE_GLOBAL_DATA_PTR;
#define KS_CCR_EEPROM BIT(9)
#define KS_BE0 BIT(12)
#define KS_BE1 BIT(13)
#define KS_CIDER 0xC0
#define CIDER_ID 0x8870
int setup_mac_address(void)
{
@ -123,11 +125,18 @@ int setup_mac_address(void)
* is present. If EEPROM is present, it must contain valid
* MAC address.
*/
u32 reg, ccr;
u32 reg, cider, ccr;
reg = fdt_get_base_address(gd->fdt_blob, off);
if (!reg)
goto out_set_ethaddr;
writew(KS_BE0 | KS_BE1 | KS_CIDER, reg + 2);
cider = readw(reg);
if ((cider & 0xfff0) != CIDER_ID) {
skip_eth1 = true;
goto out_set_ethaddr;
}
writew(KS_BE0 | KS_BE1 | KS_CCR, reg + 2);
ccr = readw(reg);
if (ccr & KS_CCR_EEPROM) {