x86: broadwell: Add support for high-speed I/O lane with ME

Provide a way to determine the HSIO (high-speed I/O) version supported by
the Intel Management Engine (ME) implementation on the platform.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/arch/x86/cpu/broadwell/Makefile b/arch/x86/cpu/broadwell/Makefile
index 012798f2064360fd92b62aa258b4bd0697c6ff01..7edb6f6f194c9d45a13c10fea99c9c7103b20c88 100644 (file)
--- a/arch/x86/cpu/broadwell/Makefile
+++ b/arch/x86/cpu/broadwell/Makefile
@@ -7,6 +7,7 @@
 obj-y += cpu.o
 obj-y += iobp.o
 obj-y += lpc.o
+obj-y += me.o
 obj-y += northbridge.o
 obj-y += pch.o
 obj-y += pinctrl_broadwell.o

diff --git a/arch/x86/cpu/broadwell/me.c b/arch/x86/cpu/broadwell/me.c
new file mode 100644 (file)
index 0000000..e03b87c
--- /dev/null
+++ b/arch/x86/cpu/broadwell/me.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2016 Google, Inc
+ *
+ * SPDX-License-Identifier:    GPL-2.0
+ *
+ * Based on code from coreboot src/soc/intel/broadwell/me_status.c
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <asm/arch/me.h>
+
+static inline void me_read_dword_ptr(struct udevice *dev, void *ptr, int offset)
+{
+       u32 dword;
+
+       dm_pci_read_config32(dev, offset, &dword);
+       memcpy(ptr, &dword, sizeof(dword));
+}
+
+int intel_me_hsio_version(struct udevice *dev, uint16_t *versionp,
+                         uint16_t *checksump)
+{
+       int count;
+       u32 hsiover;
+       struct me_hfs hfs;
+
+       /* Query for HSIO version, overloads H_GS and HFS */
+       dm_pci_write_config32(dev, PCI_ME_H_GS,
+                             ME_HSIO_MESSAGE | ME_HSIO_CMD_GETHSIOVER);
+
+       /* Must wait for ME acknowledgement */
+       for (count = ME_RETRY; count > 0; --count) {
+               me_read_dword_ptr(dev, &hfs, PCI_ME_HFS);
+               if (hfs.bios_msg_ack)
+                       break;
+               udelay(ME_DELAY);
+       }
+       if (!count) {
+               debug("ERROR: ME failed to respond\n");
+               return -ETIMEDOUT;
+       }
+
+       /* HSIO version should be in HFS_5 */
+       dm_pci_read_config32(dev, PCI_ME_HFS5, &hsiover);
+       *versionp = hsiover >> 16;
+       *checksump = hsiover & 0xffff;
+
+       debug("ME: HSIO Version            : %d (CRC 0x%04x)\n",
+             *versionp, *checksump);
+
+       /* Reset registers to normal behavior */
+       dm_pci_write_config32(dev, PCI_ME_H_GS,
+                             ME_HSIO_MESSAGE | ME_HSIO_CMD_GETHSIOVER);
+
+       return 0;
+}