pci: ftpci100: add new driver implementation

Add a new DM driver supporting FTPCI100 IP used in SoC designs.
This implementation is not based on the old non-DM ftpci100 code
dropped from U-Boot.

Enable the driver in sandbox_defconfig to test compilability.

Signed-off-by: Sergei Antonov <saproj@gmail.com>

configs/sandbox_defconfig

@@ -231,6 +231,7 @@ CONFIG_MUX_MMIO=y
 CONFIG_NVME_PCI=y
 CONFIG_PCI_REGION_MULTI_ENTRY=y
 CONFIG_PCI_SANDBOX=y
+CONFIG_PCI_FTPCI100=y
 CONFIG_PHY=y
 CONFIG_PHY_SANDBOX=y
 CONFIG_PINCTRL=y

drivers/pci/Kconfig

@@ -127,6 +127,12 @@ config PCIE_APPLE
 	  Say Y here if you want to enable PCIe controller support on
 	  Apple SoCs.
 
+config PCI_FTPCI100
+	bool "Enable Faraday FTPCI100 PCI Bridge Controller driver"
+	help
+	  Say Y here if you want to enable Faraday FTPCI100 PCI.
+	  FTPCI100 IP is used in SoC chip designs.
+
 config PCI_GT64120
 	bool "GT64120 PCI support"
 	depends on MIPS

drivers/pci/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_PCI) += pci_auto_common.o pci_common.o
 obj-$(CONFIG_PCIE_ECAM_GENERIC) += pcie_ecam_generic.o
 obj-$(CONFIG_PCIE_ECAM_SYNQUACER) += pcie_ecam_synquacer.o
 obj-$(CONFIG_PCIE_APPLE) += pcie_apple.o
+obj-$(CONFIG_PCI_FTPCI100) += pci_ftpci100.o
 obj-$(CONFIG_PCI_GT64120) += pci_gt64120.o
 obj-$(CONFIG_PCI_MPC85XX) += pci_mpc85xx.o
 obj-$(CONFIG_PCI_MSC01) += pci_msc01.o

drivers/pci/pci_ftpci100.c

@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <common.h>
+#include <pci.h>
+#include <dm.h>
+#include <asm/io.h>
+
+struct ftpci100_data {
+	void *reg_base;
+};
+
+/* AHB Control Registers */
+struct ftpci100_ahbc {
+	u32 iosize;	/* 0x00 - I/O Space Size Signal */
+	u32 prot;	/* 0x04 - AHB Protection */
+	u32 rsved[8];	/* 0x08-0x24 - Reserved */
+	u32 conf;	/* 0x28 - PCI Configuration */
+	u32 data;	/* 0x2c - PCI Configuration DATA */
+};
+
+static int ftpci100_read_config(const struct udevice *dev, pci_dev_t bdf,
+				uint offset, ulong *valuep,
+				enum pci_size_t size)
+{
+	struct ftpci100_data *priv = dev_get_priv(dev);
+	struct ftpci100_ahbc *regs = priv->reg_base;
+	u32 data;
+
+	out_le32(&regs->conf, PCI_CONF1_ADDRESS(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset));
+	data = in_le32(&regs->data);
+	*valuep = pci_conv_32_to_size(data, offset, size);
+
+	return 0;
+}
+
+static int ftpci100_write_config(struct udevice *dev, pci_dev_t bdf,
+				 uint offset, ulong value,
+				 enum pci_size_t size)
+{
+	struct ftpci100_data *priv = dev_get_priv(dev);
+	struct ftpci100_ahbc *regs = priv->reg_base;
+	u32 data;
+
+	out_le32(&regs->conf, PCI_CONF1_ADDRESS(PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf), offset));
+
+	if (size == PCI_SIZE_32) {
+		data = value;
+	} else {
+		u32 old = in_le32(&regs->data);
+
+		data = pci_conv_size_to_32(old, value, offset, size);
+	}
+
+	out_le32(&regs->data, data);
+
+	return 0;
+}
+
+static int ftpci100_probe(struct udevice *dev)
+{
+	struct ftpci100_data *priv = dev_get_priv(dev);
+	struct pci_region *io, *mem;
+	int count;
+
+	count = pci_get_regions(dev, &io, &mem, NULL);
+	if (count != 2) {
+		printf("%s: wrong count of regions: %d != 2\n", dev->name, count);
+		return -EINVAL;
+	}
+
+	priv->reg_base = phys_to_virt(io->phys_start);
+	if (!priv->reg_base)
+		return -EINVAL;
+
+	return 0;
+}
+
+static const struct dm_pci_ops ftpci100_ops = {
+	.read_config	= ftpci100_read_config,
+	.write_config	= ftpci100_write_config,
+};
+
+static const struct udevice_id ftpci100_ids[] = {
+	{ .compatible = "faraday,ftpci100" },
+	{ }
+};
+
+U_BOOT_DRIVER(ftpci100_pci) = {
+	.name		= "ftpci100_pci",
+	.id		= UCLASS_PCI,
+	.of_match	= ftpci100_ids,
+	.ops		= &ftpci100_ops,
+	.probe		= ftpci100_probe,
+	.priv_auto	= sizeof(struct ftpci100_data),
+};