x86: sandbox: Add a PMC emulator and test

Add a simple PMC for sandbox to permit tests to run.

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

1 files changed, 246 insertions, 0 deletions

diff --git a/drivers/power/acpi_pmc/pmc_emul.c b/drivers/power/acpi_pmc/pmc_emul.c
new file mode 100644
index 0000000..15cc7ac
--- /dev/null
+++ b/drivers/power/acpi_pmc/pmc_emul.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * PCI emulation device for an x86 Power-Management Controller (PMC)
+ *
+ * Copyright 2019 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <pci.h>
+#include <asm/test.h>
+#include <power/acpi_pmc.h>
+
+/**
+ * struct pmc_emul_platdata - platform data for this device
+ *
+ * @command:	Current PCI command value
+ * @bar:	Current base address values
+ */
+struct pmc_emul_platdata {
+	u16 command;
+	u32 bar[6];
+};
+
+enum {
+	MEMMAP_SIZE	= 0x80,
+};
+
+static struct pci_bar {
+	int type;
+	u32 size;
+} barinfo[] = {
+	{ PCI_BASE_ADDRESS_MEM_TYPE_32, MEMMAP_SIZE },
+	{ 0, 0 },
+	{ 0, 0 },
+	{ 0, 0 },
+	{ PCI_BASE_ADDRESS_SPACE_IO, 256 },
+};
+
+struct pmc_emul_priv {
+	u8 regs[MEMMAP_SIZE];
+};
+
+static int sandbox_pmc_emul_read_config(struct udevice *emul, uint offset,
+					ulong *valuep, enum pci_size_t size)
+{
+	struct pmc_emul_platdata *plat = dev_get_platdata(emul);
+
+	switch (offset) {
+	case PCI_COMMAND:
+		*valuep = plat->command;
+		break;
+	case PCI_HEADER_TYPE:
+		*valuep = 0;
+		break;
+	case PCI_VENDOR_ID:
+		*valuep = SANDBOX_PCI_VENDOR_ID;
+		break;
+	case PCI_DEVICE_ID:
+		*valuep = SANDBOX_PCI_PMC_EMUL_ID;
+		break;
+	case PCI_CLASS_DEVICE:
+		if (size == PCI_SIZE_8) {
+			*valuep = SANDBOX_PCI_CLASS_SUB_CODE;
+		} else {
+			*valuep = (SANDBOX_PCI_CLASS_CODE << 8) |
+					SANDBOX_PCI_CLASS_SUB_CODE;
+		}
+		break;
+	case PCI_CLASS_CODE:
+		*valuep = SANDBOX_PCI_CLASS_CODE;
+		break;
+	case PCI_BASE_ADDRESS_0:
+	case PCI_BASE_ADDRESS_1:
+	case PCI_BASE_ADDRESS_2:
+	case PCI_BASE_ADDRESS_3:
+	case PCI_BASE_ADDRESS_4:
+	case PCI_BASE_ADDRESS_5: {
+		int barnum;
+		u32 *bar;
+
+		barnum = pci_offset_to_barnum(offset);
+		bar = &plat->bar[barnum];
+
+		*valuep = sandbox_pci_read_bar(*bar, barinfo[barnum].type,
+					       barinfo[barnum].size);
+		break;
+	}
+	case PCI_CAPABILITY_LIST:
+		*valuep = PCI_CAP_ID_PM_OFFSET;
+		break;
+	}
+
+	return 0;
+}
+
+static int sandbox_pmc_emul_write_config(struct udevice *emul, uint offset,
+					 ulong value, enum pci_size_t size)
+{
+	struct pmc_emul_platdata *plat = dev_get_platdata(emul);
+
+	switch (offset) {
+	case PCI_COMMAND:
+		plat->command = value;
+		break;
+	case PCI_BASE_ADDRESS_0:
+	case PCI_BASE_ADDRESS_1: {
+		int barnum;
+		u32 *bar;
+
+		barnum = pci_offset_to_barnum(offset);
+		bar = &plat->bar[barnum];
+
+		debug("w bar %d=%lx\n", barnum, value);
+		*bar = value;
+		/* space indicator (bit#0) is read-only */
+		*bar |= barinfo[barnum].type;
+		break;
+	}
+	}
+
+	return 0;
+}
+
+static int sandbox_pmc_emul_find_bar(struct udevice *emul, unsigned int addr,
+				     int *barnump, unsigned int *offsetp)
+{
+	struct pmc_emul_platdata *plat = dev_get_platdata(emul);
+	int barnum;
+
+	for (barnum = 0; barnum < ARRAY_SIZE(barinfo); barnum++) {
+		unsigned int size = barinfo[barnum].size;
+		u32 base = plat->bar[barnum] & ~PCI_BASE_ADDRESS_SPACE;
+
+		if (addr >= base && addr < base + size) {
+			*barnump = barnum;
+			*offsetp = addr - base;
+			return 0;
+		}
+	}
+	*barnump = -1;
+
+	return -ENOENT;
+}
+
+static int sandbox_pmc_emul_read_io(struct udevice *dev, unsigned int addr,
+				    ulong *valuep, enum pci_size_t size)
+{
+	unsigned int offset;
+	int barnum;
+	int ret;
+
+	ret = sandbox_pmc_emul_find_bar(dev, addr, &barnum, &offset);
+	if (ret)
+		return ret;
+
+	if (barnum == 4)
+		*valuep = offset;
+	else if (barnum == 0)
+		*valuep = offset;
+
+	return 0;
+}
+
+static int sandbox_pmc_emul_write_io(struct udevice *dev, unsigned int addr,
+				     ulong value, enum pci_size_t size)
+{
+	unsigned int offset;
+	int barnum;
+	int ret;
+
+	ret = sandbox_pmc_emul_find_bar(dev, addr, &barnum, &offset);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int sandbox_pmc_emul_map_physmem(struct udevice *dev,
+					phys_addr_t addr, unsigned long *lenp,
+					void **ptrp)
+{
+	struct pmc_emul_priv *priv = dev_get_priv(dev);
+	unsigned int offset, avail;
+	int barnum;
+	int ret;
+
+	ret = sandbox_pmc_emul_find_bar(dev, addr, &barnum, &offset);
+	if (ret)
+		return ret;
+
+	if (barnum == 0) {
+		*ptrp = priv->regs + offset;
+		avail = barinfo[0].size - offset;
+		if (avail > barinfo[0].size)
+			*lenp = 0;
+		else
+			*lenp = min(*lenp, (ulong)avail);
+
+		return 0;
+	}
+
+	return -ENOENT;
+}
+
+static int sandbox_pmc_probe(struct udevice *dev)
+{
+	struct pmc_emul_priv *priv = dev_get_priv(dev);
+	int i;
+
+	for (i = 0; i < MEMMAP_SIZE; i++)
+		priv->regs[i] = i;
+
+	return 0;
+}
+
+static struct dm_pci_emul_ops sandbox_pmc_emul_emul_ops = {
+	.read_config = sandbox_pmc_emul_read_config,
+	.write_config = sandbox_pmc_emul_write_config,
+	.read_io = sandbox_pmc_emul_read_io,
+	.write_io = sandbox_pmc_emul_write_io,
+	.map_physmem = sandbox_pmc_emul_map_physmem,
+};
+
+static const struct udevice_id sandbox_pmc_emul_ids[] = {
+	{ .compatible = "sandbox,pmc-emul" },
+	{ }
+};
+
+U_BOOT_DRIVER(sandbox_pmc_emul_emul) = {
+	.name		= "sandbox_pmc_emul_emul",
+	.id		= UCLASS_PCI_EMUL,
+	.of_match	= sandbox_pmc_emul_ids,
+	.ops		= &sandbox_pmc_emul_emul_ops,
+	.probe		= sandbox_pmc_probe,
+	.priv_auto_alloc_size = sizeof(struct pmc_emul_priv),
+	.platdata_auto_alloc_size = sizeof(struct pmc_emul_platdata),
+};
+
+static struct pci_device_id sandbox_pmc_emul_supported[] = {
+	{ PCI_VDEVICE(SANDBOX, SANDBOX_PCI_PMC_EMUL_ID) },
+	{},
+};
+
+U_BOOT_PCI_DEVICE(sandbox_pmc_emul_emul, sandbox_pmc_emul_supported);