pci: add DM based mpc85xx driver

add DM based PCI Configuration space access support for
MPC85xx PCI Bridge. This driver is based on
arch/powerpc/cpu/mpc85xx/pci.c

In the old driver there is a fix for a hw issue on the
TARGET_MPC8555CDS and TARGET_MPC8541CDS boards. As I
have no such hardware I did not port this part.

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

MAINTAINERS

@@ -701,6 +701,11 @@ S:	Maintained
 F:	drivers/pci_endpoint/
 F:  include/pci_ep.h
 
+PCI MPC85xx
+M:	Heiko Schocher <hs@denx.de>
+S:	Maintained
+F:	drivers/pci/pci_mpc85xx.c
+
 POWER
 M:	Jaehoon Chung <jh80.chung@samsung.com>
 S:	Maintained

drivers/pci/Kconfig

@@ -68,6 +68,13 @@ config PCIE_FSL
 	  PowerPC MPC85xx, MPC86xx, B series, P series and T series SoCs.
 	  This driver does not support SRIO_PCIE_BOOT feature.
 
+config PCI_MPC85XX
+	bool "MPC85XX PowerPC PCI support"
+	depends on DM_PCI
+	help
+	  Say Y here if you want to enable PCI controller support on FSL
+	  PowerPC MPC85xx SoC.
+
 config PCI_RCAR_GEN2
 	bool "Renesas RCar Gen2 PCIe driver"
 	depends on DM_PCI

drivers/pci/Makefile

@@ -19,6 +19,7 @@ obj-$(CONFIG_PCIE_ECAM_GENERIC) += pcie_ecam_generic.o
 obj-$(CONFIG_FSL_PCI_INIT) += fsl_pci_init.o
 obj-$(CONFIG_PCI_INDIRECT_BRIDGE) += pci_indirect.o
 obj-$(CONFIG_PCI_GT64120) += pci_gt64120.o
+obj-$(CONFIG_PCI_MPC85XX) += pci_mpc85xx.o
 obj-$(CONFIG_PCI_MSC01) += pci_msc01.o
 obj-$(CONFIG_PCIE_IMX) += pcie_imx.o
 obj-$(CONFIG_FTPCI100) += pci_ftpci100.o

drivers/pci/pci_mpc85xx.c

@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) Copyright 2019
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
+ *
+ */
+#include <common.h>
+#include <asm/cpm_85xx.h>
+#include <pci.h>
+#include <dm.h>
+#include <asm/fsl_law.h>
+
+struct mpc85xx_pci_priv {
+	void __iomem		*cfg_addr;
+	void __iomem		*cfg_data;
+};
+
+static int mpc85xx_pci_dm_read_config(struct udevice *dev, pci_dev_t bdf,
+				      uint offset, ulong *value,
+				      enum pci_size_t size)
+{
+	struct mpc85xx_pci_priv *priv = dev_get_priv(dev);
+	u32 addr;
+
+	addr = bdf | (offset & 0xfc) | ((offset & 0xf00) << 16) | 0x80000000;
+	out_be32(priv->cfg_addr, addr);
+	sync();
+	*value = pci_conv_32_to_size(in_le32(priv->cfg_data), offset, size);
+
+	return 0;
+}
+
+static int mpc85xx_pci_dm_write_config(struct udevice *dev, pci_dev_t bdf,
+				       uint offset, ulong value,
+				       enum pci_size_t size)
+{
+	struct mpc85xx_pci_priv *priv = dev_get_priv(dev);
+	u32 addr;
+
+	addr = bdf | (offset & 0xfc) | ((offset & 0xf00) << 16) | 0x80000000;
+	out_be32(priv->cfg_addr, addr);
+	sync();
+	out_le32(priv->cfg_data, pci_conv_size_to_32(0, value, offset, size));
+
+	return 0;
+}
+
+static int
+mpc85xx_pci_dm_setup_laws(struct pci_region *io, struct pci_region *mem,
+			  struct pci_region *pre)
+{
+	/*
+	 * Unfortunately we have defines for this addresse,
+	 * as we have to setup the TLB, and at this stage
+	 * we have no access to DT ... may we check here
+	 * if the value in the define is the same ?
+	 */
+	if (mem)
+		set_next_law(mem->phys_start, law_size_bits(mem->size),
+			     LAW_TRGT_IF_PCI);
+	if (io)
+		set_next_law(io->phys_start, law_size_bits(io->size),
+			     LAW_TRGT_IF_PCI);
+	if (pre)
+		set_next_law(pre->phys_start, law_size_bits(pre->size),
+			     LAW_TRGT_IF_PCI);
+
+	return 0;
+}
+
+static int mpc85xx_pci_dm_probe(struct udevice *dev)
+{
+	struct mpc85xx_pci_priv *priv = dev_get_priv(dev);
+	struct pci_region *io;
+	struct pci_region *mem;
+	struct pci_region *pre;
+	int count;
+	ccsr_pcix_t *pcix;
+
+	count = pci_get_regions(dev, &io, &mem, &pre);
+	if (count != 2) {
+		printf("%s: wrong count of regions %d only 2 allowed\n",
+		       __func__, count);
+		return -EINVAL;
+	}
+
+	mpc85xx_pci_dm_setup_laws(io, mem, pre);
+
+	pcix = priv->cfg_addr;
+	/* BAR 1: memory */
+	out_be32(&pcix->potar1, (mem->bus_start >> 12) & 0x000fffff);
+	out_be32(&pcix->potear1, 0);
+	out_be32(&pcix->powbar1, (mem->phys_start >> 12) & 0x000fffff);
+	out_be32(&pcix->powbear1, 0);
+	out_be32(&pcix->powar1, (POWAR_EN | POWAR_MEM_READ |
+		 POWAR_MEM_WRITE | (__ilog2(mem->size) - 1)));
+
+	/* BAR 1: IO */
+	out_be32(&pcix->potar2, (io->bus_start >> 12) & 0x000fffff);
+	out_be32(&pcix->potear2, 0);
+	out_be32(&pcix->powbar2, (io->phys_start >> 12) & 0x000fffff);
+	out_be32(&pcix->powbear2, 0);
+	out_be32(&pcix->powar2, (POWAR_EN | POWAR_IO_READ |
+		 POWAR_IO_WRITE | (__ilog2(io->size) - 1)));
+
+	out_be32(&pcix->pitar1, 0);
+	out_be32(&pcix->piwbar1, 0);
+	out_be32(&pcix->piwar1, (PIWAR_EN | PIWAR_PF | PIWAR_LOCAL |
+		 PIWAR_READ_SNOOP | PIWAR_WRITE_SNOOP | PIWAR_MEM_2G));
+
+	out_be32(&pcix->powar3, 0);
+	out_be32(&pcix->powar4, 0);
+	out_be32(&pcix->piwar2, 0);
+	out_be32(&pcix->piwar3, 0);
+
+	return 0;
+}
+
+static int mpc85xx_pci_dm_remove(struct udevice *dev)
+{
+	return 0;
+}
+
+static int mpc85xx_pci_ofdata_to_platdata(struct udevice *dev)
+{
+	struct mpc85xx_pci_priv *priv = dev_get_priv(dev);
+	fdt_addr_t addr;
+
+	addr = devfdt_get_addr_index(dev, 0);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+	priv->cfg_addr = (void __iomem *)addr;
+	addr += 4;
+	priv->cfg_data = (void __iomem *)addr;
+
+	return 0;
+}
+
+static const struct dm_pci_ops mpc85xx_pci_ops = {
+	.read_config	= mpc85xx_pci_dm_read_config,
+	.write_config	= mpc85xx_pci_dm_write_config,
+};
+
+static const struct udevice_id mpc85xx_pci_ids[] = {
+	{ .compatible = "fsl,mpc8540-pci" },
+	{ }
+};
+
+U_BOOT_DRIVER(mpc85xx_pci) = {
+	.name			= "mpc85xx_pci",
+	.id			= UCLASS_PCI,
+	.of_match		= mpc85xx_pci_ids,
+	.ops			= &mpc85xx_pci_ops,
+	.probe			= mpc85xx_pci_dm_probe,
+	.remove			= mpc85xx_pci_dm_remove,
+	.ofdata_to_platdata	= mpc85xx_pci_ofdata_to_platdata,
+	.priv_auto_alloc_size	= sizeof(struct mpc85xx_pci_priv),
+};