sb/intel/lynxpoint: Move IOBP API to its own compilation unit

Change-Id: Icb6114302cebe19bc3c1971929ea4fc085b454be
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41946
Reviewed-by: Michael Niewöhner
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Jonathan Kollasch <jakllsch@kollasch.net>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 111 insertions, 0 deletions

diff --git a/src/southbridge/intel/lynxpoint/iobp.c b/src/southbridge/intel/lynxpoint/iobp.c
new file mode 100644
index 0000000000..3df694068f
--- /dev/null
+++ b/src/southbridge/intel/lynxpoint/iobp.c
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <delay.h>
+#include "pch.h"
+#include "iobp.h"
+
+#define IOBP_RETRY 1000
+
+static inline int iobp_poll(void)
+{
+	unsigned int try;
+
+	for (try = IOBP_RETRY; try > 0; try--) {
+		u16 status = RCBA16(IOBPS);
+		if ((status & IOBPS_READY) == 0)
+			return 1;
+		udelay(10);
+	}
+
+	printk(BIOS_ERR, "IOBP: timeout waiting for transaction to complete\n");
+	return 0;
+}
+
+u32 pch_iobp_read(u32 address)
+{
+	u16 status;
+
+	if (!iobp_poll())
+		return 0;
+
+	/* Set the address */
+	RCBA32(IOBPIRI) = address;
+
+	/* READ OPCODE */
+	status = RCBA16(IOBPS);
+	status &= ~IOBPS_MASK;
+	status |= IOBPS_READ;
+	RCBA16(IOBPS) = status;
+
+	/* Undocumented magic */
+	RCBA16(IOBPU) = IOBPU_MAGIC;
+
+	/* Set ready bit */
+	status = RCBA16(IOBPS);
+	status |= IOBPS_READY;
+	RCBA16(IOBPS) = status;
+
+	if (!iobp_poll())
+		return 0;
+
+	/* Check for successful transaction */
+	status = RCBA16(IOBPS);
+	if (status & IOBPS_TX_MASK) {
+		printk(BIOS_ERR, "IOBP: read 0x%08x failed\n", address);
+		return 0;
+	}
+
+	/* Read IOBP data */
+	return RCBA32(IOBPD);
+}
+
+void pch_iobp_write(u32 address, u32 data)
+{
+	u16 status;
+
+	if (!iobp_poll())
+		return;
+
+	/* Set the address */
+	RCBA32(IOBPIRI) = address;
+
+	/* WRITE OPCODE */
+	status = RCBA16(IOBPS);
+	status &= ~IOBPS_MASK;
+	status |= IOBPS_WRITE;
+	RCBA16(IOBPS) = status;
+
+	RCBA32(IOBPD) = data;
+
+	/* Undocumented magic */
+	RCBA16(IOBPU) = IOBPU_MAGIC;
+
+	/* Set ready bit */
+	status = RCBA16(IOBPS);
+	status |= IOBPS_READY;
+	RCBA16(IOBPS) = status;
+
+	if (!iobp_poll())
+		return;
+
+	/* Check for successful transaction */
+	status = RCBA16(IOBPS);
+	if (status & IOBPS_TX_MASK) {
+		printk(BIOS_ERR, "IOBP: write 0x%08x failed\n", address);
+		return;
+	}
+
+	printk(BIOS_INFO, "IOBP: set 0x%08x to 0x%08x\n", address, data);
+}
+
+void pch_iobp_update(u32 address, u32 andvalue, u32 orvalue)
+{
+	u32 data = pch_iobp_read(address);
+
+	/* Update the data */
+	data &= andvalue;
+	data |= orvalue;
+
+	pch_iobp_write(address, data);
+}