CIX: Adapt PCIE driver for ACPI.

This patchset introduces PCIe driver support for ACPI-based CIX
platforms.

Signed-off-by: wenxue.ding <Wenxue.Ding@cixtech.com>

Author: dingwenxue1983

arch/arm64/configs/deepin_arm64_desktop_defconfig

@@ -2370,7 +2370,6 @@ CONFIG_PPS_CLIENT_GPIO=m
 CONFIG_GPIO_SYSFS=y
 CONFIG_GPIO_74XX_MMIO=m
 CONFIG_GPIO_AMDPT=m
-CONFIG_GPIO_CADENCE=m
 CONFIG_GPIO_DWAPB=y
 CONFIG_GPIO_GENERIC_PLATFORM=y
 CONFIG_GPIO_GRGPIO=m
@@ -4246,6 +4245,7 @@ CONFIG_PHY_XILINX_ZYNQMP=m
 CONFIG_PHY_CIX_USBDP=m
 CONFIG_PHY_CIX_USB2=m
 CONFIG_PHY_CIX_USB3=m
+CONFIG_PHY_CIX_PCIE=y
 CONFIG_POWERCAP=y
 CONFIG_ARM_CCI_PMU=m
 CONFIG_ARM_CCN=m

drivers/phy/cix/Kconfig

@@ -26,3 +26,11 @@ config PHY_CIX_USB3
 	select GENERIC_PHY
 	help
 	  Enable this to support the CIX USB3 PHY for TYPEA Connection
+
+config PHY_CIX_PCIE
+        bool "Cix PCIE PHY Driver"
+        depends on OF && HAS_IOMEM && ARM64
+        select GENERIC_PHY
+	select GPIO_CADENCE
+        help
+          Enable this to support the CIX PCIE PHY

drivers/phy/cix/Makefile

@@ -2,3 +2,4 @@
 obj-$(CONFIG_PHY_CIX_USBDP) += phy-cix-usbdp.o
 obj-$(CONFIG_PHY_CIX_USB2) += phy-cix-usb2.o
 obj-$(CONFIG_PHY_CIX_USB3) += phy-cix-usb3.o
+obj-$(CONFIG_PHY_CIX_PCIE) += phy-cix-pcie.o

drivers/phy/cix/phy-cix-pcie.c

@@ -3,3 +3,4 @@ obj-$(CONFIG_CIX_SKY1_SOCINFO) += cix-sky1-socinfo.o
 obj-$(CONFIG_CIX_SOC_ACPI) += acpi/
 obj-$(CONFIG_CIX_SOC_ACPI) += mailbox/
 obj-$(CONFIG_CIX_SOC_ACPI) += scmi/
+obj-$(CONFIG_CIX_SOC_ACPI) += pcie/

drivers/soc/cix/Makefile

@@ -1,6 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- *
  * Add CIX SKY1 SoC Version driver
  *
  */
@@ -9,31 +8,142 @@
 #include <linux/platform_device.h>
 #include <linux/types.h>
 #include <linux/acpi.h>
+#include <linux/soc/cix/cpu.h>
+
+enum {
+	DENY_PCIE = 0,
+	DENY_USB,
+	DENY_SCMI_CLKS,
+	DENY_MAX,
+};
+
+static bool pcie_pnp_en;
+static bool usb_pnp_en;
+static bool acpi_scmi_en = true;
+
+static int __init pcie_pnp_update(char *str)
+{
+	pcie_pnp_en = true;
+
+	return 0;
+}
+early_param("pcie_pnp_en", pcie_pnp_update);
+
+static int __init usb_pnp_update(char *str)
+{
+	usb_pnp_en = true;
+
+	return 0;
+}
+early_param("usb_pnp_en", usb_pnp_update);
+
+static int __init parse_acpi_scmi_support(char *arg)
+{
+	if (!arg)
+		return -EINVAL;
+
+	if (strcmp(arg, "off") == 0)
+		acpi_scmi_en = false;
+	else if (strcmp(arg, "on") == 0)
+		acpi_scmi_en = true;
+	else
+		return -EINVAL;
+
+	return 0;
+}
+early_param("acpi_scmi_en", parse_acpi_scmi_support);
+
+static struct acpi_device_id pcie_pnp_deny_ids[] = {
+	/* override PCIE acpi scan handler */
+	{"PNP0A03", 0}, /* PCIE */
+	{"PNP0C0F", 0}, /* PCIE Links */
+	{"", 0},
+};
 
-static const struct acpi_device_id device_deny_ids[] = {
+static struct acpi_device_id usb_pnp_deny_ids[] = {
 	{"PNP0D10", 0},
 	{"", 0},
 };
 
+static struct acpi_device_id pcie_cdns_deny_ids[] = {
+	{"CIXH2020", 0}, /* pcie rc */
+	{"CIXH2021", 0}, /* pcie ep */
+	{"CIXH2023", 0}, /* pcie phy */
+	{"", 0},
+};
+
+static struct acpi_device_id usb_cdns_deny_ids[] = {
+	{"CIXH2030", 0}, /* sky1 usbssp */
+	{"CIXH2031", 0}, /* cdns usbssp */
+	{"CIXH2032", 0}, /* usb 2.0 phy */
+	/* CIXH2033 is combo phy, also used by dp */
+	{"CIXH2034", 0}, /* usb 3.0 phy */
+	{"", 0},
+};
+
+static struct acpi_device_id acpi_clks_deny_ids[] = {
+	{"CIXHA010", 0},
+	{"", 0},
+};
+
+static struct acpi_device_id scmi_clks_deny_ids[] = {
+	{"CIXHA009", 0},
+	{"", 0},
+};
+
 static int acpi_device_deny(struct acpi_device *adev,
 			     const struct acpi_device_id *not_used)
 {
-	acpi_set_device_status(adev, 0);
-
 	dev_dbg(&adev->dev, "acpi disable dev[%s]\n", dev_name(&adev->dev));
 
 	return -1; /* return -1 to block platform device enumeration */
 }
 
-static struct acpi_scan_handler device_deny_handler = {
-	.ids = device_deny_ids,
-	.attach = acpi_device_deny,
+static struct acpi_scan_handler acpi_deny_handler[DENY_MAX] = {
+	{
+		.ids = pcie_pnp_deny_ids,
+		.attach = acpi_device_deny,
+	},
+	{
+		.ids = usb_pnp_deny_ids,
+		.attach = acpi_device_deny,
+	}
 };
 
-int cix_acpi_plat_arch_init(void)
+static void device_deny_id_init(void)
 {
-	acpi_scan_add_handler(&device_deny_handler);
+	int i;
+
+	if (pcie_pnp_en)
+		acpi_deny_handler[DENY_PCIE].ids = pcie_cdns_deny_ids;
+
+	if (usb_pnp_en)
+		acpi_deny_handler[DENY_USB].ids = usb_cdns_deny_ids;
+
+	if (acpi_scmi_en)
+		acpi_deny_handler[DENY_SCMI_CLKS].ids = acpi_clks_deny_ids;
+	else
+		acpi_deny_handler[DENY_SCMI_CLKS].ids = scmi_clks_deny_ids;
+
+	for (i = 0; i < DENY_MAX; i++)
+		acpi_scan_add_handler(&acpi_deny_handler[i]);
+}
 
+void cix_pcie_io_space_init(void)
+{
+	/*
+	 * Default IO space is limited to IO_SPACE_LIMIT, which not enough
+	 * for current usage. Especially in acpi case. So extend it here.
+	 */
+	ioport_resource.end = -1;
+}
+
+int cix_acpi_plat_arch_init(void)
+{
+	if (cpu_is_cix_p1_family()) {
+		cix_pcie_io_space_init();
+		device_deny_id_init();
+	}
 	return 0;
 }
 arch_initcall(cix_acpi_plat_arch_init);

drivers/soc/cix/acpi/cix-acpi-plat.c

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+pcie-cix-y := pcie-cix.o pcie-cix-host.o pci-sky1.o pci-sky1-debugfs.o
+obj-y += pcie-cix.o