aopen/dxplplusu: Add early GPIO settings

Required for 2nd COM port to work.

Change-Id: Ib211e9c4b487fadec3d3487f9d745f44d8ca4579
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52815
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

3 files changed, 110 insertions, 1 deletions

diff --git a/src/mainboard/aopen/dxplplusu/bootblock.c b/src/mainboard/aopen/dxplplusu/bootblock.c
index 5a969cfc13..93662a27f2 100644
--- a/src/mainboard/aopen/dxplplusu/bootblock.c
+++ b/src/mainboard/aopen/dxplplusu/bootblock.c
@@ -1,12 +1,120 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
+#include <arch/io.h>
 #include <bootblock_common.h>
+#include <device/pci_ops.h>
+#include <device/pnp_ops.h>
+#include <device/pnp.h>
+#include <southbridge/intel/i82801dx/i82801dx.h>
 #include <superio/smsc/lpc47m10x/lpc47m10x.h>
 
 #define SERIAL_DEV PNP_DEV(0x2e, LPC47M10X2_SP1)
+#define GPIO_DEV PNP_DEV(0x2e, LPC47M10X2_PME)
+#define PME_BASE 0xe00
+
+/*
+ * JP3
+ * 1-2 0:1f.0 0xd4 GEN_STA SAFE_MODE = 0
+ * 2-3 0:1f.0 0xd4 GEN_STA SAFE_MODE = 1
+ */
+
+static void enable_gpio(void)
+{
+	const pci_devfn_t dev = PCI_DEV(0, 0x1f, 0);
+
+	/* These should go under sb/. */
+	pci_write_config8(dev, COM_DEC, 0x10);
+	pci_write_config16(dev, LPC_EN, 0x300F);
+
+	pnp_enter_conf_state(GPIO_DEV);
+	pnp_set_logical_device(GPIO_DEV);
+	pnp_set_enable(GPIO_DEV, 0);
+	pnp_set_iobase(GPIO_DEV, PNP_IDX_IO0, PME_BASE);
+	pnp_set_enable(GPIO_DEV, 1);
+	pnp_exit_conf_state(GPIO_DEV);
+
+	pci_write_config16(dev, GEN1_DEC, PME_BASE | 0x01);
+}
+
+static void gpio_write(u8 addr, u8 val)
+{
+	outb(val, PME_BASE + addr);
+}
+
+static void gpio_read_write(u8 addr, u8 amask, u8 omask)
+{
+	u8 val = inb(PME_BASE + addr);
+	val &= amask;
+	val |= omask;
+	outb(val, PME_BASE + addr);
+}
+
+static void configure_gpios(void)
+{
+	/* GP10-17 */
+	gpio_write(0x23, 0x00); /* push-pull output */
+	gpio_write(0x24, 0x81); /* open-drain but input ? */
+	gpio_write(0x25, 0x01);
+	gpio_write(0x26, 0x01);
+	gpio_write(0x27, 0x01);
+	gpio_write(0x28, 0x01);
+	gpio_write(0x29, 0x01);
+	gpio_write(0x2a, 0x00); /* push-pull output */
+
+	/* GP20-27 */
+	gpio_write(0x2b, 0x01);
+	gpio_write(0x2c, 0x0c); /* nDS1 floppy select */
+	gpio_write(0x2d, 0x00); /* push-pull output */
+	gpio_write(0x2f, 0x01);
+	gpio_write(0x30, 0x01);
+	gpio_write(0x31, 0x01);
+	gpio_write(0x32, 0x04); /* nIO_SMI */
+
+	/* GP30-37 */
+	gpio_write(0x33, 0x04); /* FAN_TACH2 */
+	gpio_write(0x34, 0x01);
+	gpio_write(0x35, 0x01);
+	gpio_write(0x36, 0x01);
+	gpio_write(0x37, 0x01);
+	gpio_write(0x38, 0x01);
+	gpio_write(0x39, 0x04); /* nKBDRESET */
+	gpio_write(0x3a, 0x04); /* A20M */
+
+	/* GP40-43 */
+	gpio_write(0x3b, 0x84); /* DRVDEN0 open-drain */
+	gpio_write(0x3c, 0x04); /* DRVDEN1 push/pull */
+	gpio_write(0x3d, 0x84); /* nIO_PME open-drain */
+	gpio_write(0x3e, 0x01);
+
+	/* GP50-GP57 to UART signals */
+	gpio_write(0x3f, 0x05);
+	gpio_write(0x40, 0x05);
+	gpio_write(0x41, 0x05);
+	gpio_write(0x42, 0x04);
+	gpio_write(0x43, 0x05);
+	gpio_write(0x44, 0x04);
+	gpio_write(0x45, 0x05);
+	gpio_write(0x46, 0x04);
+
+	/* GP60-GP61 */
+	gpio_write(0x47, 0x86); /* LED1 invert open-drain */
+	gpio_write(0x48, 0x81); /* open-drain but input */
+
+	/* Set initial output bits */
+	gpio_read_write(0x4b, 0xff, 0x81);	/* GP1 */
+	gpio_read_write(0x4c, ~0x01, 0x00);	/* GP2 */
+	gpio_read_write(0x4d, 0xff, 0x80);	/* GP3 */
+	gpio_read_write(0x4e, ~0x08, 0x00);	/* GP4 */
+
+	/* LED1 off */
+	gpio_write(0x5d, 0x00);
+}
 
 void bootblock_mainboard_early_init(void)
 {
+	enable_gpio();
+	configure_gpios();
+
 	/* Get the serial port configured. */
 	lpc47m10x_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
 }
diff --git a/src/mainboard/aopen/dxplplusu/devicetree.cb b/src/mainboard/aopen/dxplplusu/devicetree.cb
index 4f3102d328..2dfa03d873 100644
--- a/src/mainboard/aopen/dxplplusu/devicetree.cb
+++ b/src/mainboard/aopen/dxplplusu/devicetree.cb
@@ -41,7 +41,7 @@ chip northbridge/intel/e7505
 						io 0x60 = 0x3f8
 						irq 0x70 = 4
 					end
-					device pnp 2e.5 off # Com2
+					device pnp 2e.5 on # Com2
 						io 0x60 = 0x2f8
 						irq 0x70 = 3
 					end
diff --git a/src/southbridge/intel/i82801dx/i82801dx.h b/src/southbridge/intel/i82801dx/i82801dx.h
index e63327c01e..c07e5812fd 100644
--- a/src/southbridge/intel/i82801dx/i82801dx.h
+++ b/src/southbridge/intel/i82801dx/i82801dx.h
@@ -71,6 +71,7 @@ void i82801dx_early_init(void);
 #define PIRQG_ROUT	0x6A
 #define PIRQH_ROUT	0x6B
 #define COM_DEC         0xE0
+#define GEN1_DEC        0xE4
 #define LPC_EN          0xE6
 #define FUNC_DIS        0xF2