kmp204x: Add support for the unit LEDs

The unit LEDs are managed by the QRIO CPLD. This patch adds support for
accessing these LEDs in the QRIO.

The LEDs then are set to a correct boot state:
- UNIT-LED is red
- BOOT-LED is on.

Signed-off-by: Stefan Bigler <stefan.bigler@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>

board/keymile/kmp204x/kmp204x.c

@@ -113,6 +113,9 @@ int board_early_init_r(void)
 	if (ret)
 		printf("error triggering PCIe FPGA config\n");
 
+	/* enable the Unit LED (red) & Boot LED (on) */
+	qrio_set_leds();
+
 	return ret;
 }
 

board/keymile/kmp204x/kmp204x.h

@@ -21,5 +21,6 @@ void qrio_gpio_direction_input(u8 port_off, u8 gpio_nr);
 
 void qrio_prst(u8 bit, bool en, bool wden);
 void qrio_prstcfg(u8 bit, u8 mode);
+void qrio_set_leds(void);
 
 void pci_of_setup(void *blob, bd_t *bd);

board/keymile/kmp204x/qrio.c

@@ -144,3 +144,18 @@ void qrio_prstcfg(u8 bit, u8 mode)
 
 	out_be32(qrio_base + PRSTCFG_OFF, prstcfg);
 }
+
+#define CTRLH_OFF		0x02
+#define CTRLH_WRL_BOOT		0x01
+#define CTRLH_WRL_UNITRUN	0x02
+
+void qrio_set_leds(void)
+{
+	u8 ctrlh;
+	void __iomem *qrio_base = (void *)CONFIG_SYS_QRIO_BASE;
+
+	/* set UNIT LED to RED and BOOT LED to ON */
+	ctrlh = in_8(qrio_base + CTRLH_OFF);
+	ctrlh |= (CTRLH_WRL_BOOT | CTRLH_WRL_UNITRUN);
+	out_8(qrio_base + CTRLH_OFF, ctrlh);
+}