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-rw-r--r--drivers/staging/Kconfig2
-rw-r--r--drivers/staging/mt7621-pci/Kconfig7
-rw-r--r--drivers/staging/mt7621-pci/pci-mt7621.c226
3 files changed, 218 insertions, 17 deletions
diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 2bce6473318d..732b63182d27 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -110,6 +110,8 @@ source "drivers/staging/vboxvideo/Kconfig"
source "drivers/staging/pi433/Kconfig"
+source "drivers/staging/mt7621-pci/Kconfig"
+
source "drivers/staging/mt7621-pinctrl/Kconfig"
source "drivers/staging/mt7621-spi/Kconfig"
diff --git a/drivers/staging/mt7621-pci/Kconfig b/drivers/staging/mt7621-pci/Kconfig
new file mode 100644
index 000000000000..d33533872a16
--- /dev/null
+++ b/drivers/staging/mt7621-pci/Kconfig
@@ -0,0 +1,7 @@
+config PCI_MT7621
+ tristate "MediaTek MT7621 PCI Controller"
+ depends on RALINK
+ select PCI_DRIVERS_GENERIC
+ help
+ This selects a driver for the MediaTek MT7621 PCI Controller.
+
diff --git a/drivers/staging/mt7621-pci/pci-mt7621.c b/drivers/staging/mt7621-pci/pci-mt7621.c
index 650e49b995e3..12702917bbaa 100644
--- a/drivers/staging/mt7621-pci/pci-mt7621.c
+++ b/drivers/staging/mt7621-pci/pci-mt7621.c
@@ -53,11 +53,16 @@
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <ralink_regs.h>
#include <mt7621.h>
+#include "../../pci/pci.h"
+
/*
* These functions and structures provide the BIOS scan and mapping of the PCI
* devices.
@@ -178,6 +183,43 @@ static int pcie_link_status = 0;
#define PCI_ACCESS_WRITE_2 4
#define PCI_ACCESS_WRITE_4 5
+/**
+ * struct mt7621_pcie_port - PCIe port information
+ * @base: IO mapped register base
+ * @list: port list
+ * @pcie: pointer to PCIe host info
+ * @reset: pointer to port reset control
+ */
+struct mt7621_pcie_port {
+ void __iomem *base;
+ struct list_head list;
+ struct mt7621_pcie *pcie;
+ struct reset_control *reset;
+};
+
+/**
+ * struct mt7621_pcie - PCIe host information
+ * @base: IO Mapped Register Base
+ * @io: IO resource
+ * @mem: non-prefetchable memory resource
+ * @busn: bus range
+ * @offset: IO / Memory offset
+ * @dev: Pointer to PCIe device
+ * @ports: pointer to PCIe port information
+ */
+struct mt7621_pcie {
+ void __iomem *base;
+ struct device *dev;
+ struct resource io;
+ struct resource mem;
+ struct resource busn;
+ struct {
+ resource_size_t mem;
+ resource_size_t io;
+ } offset;
+ struct list_head ports;
+};
+
static inline u32 mt7621_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
unsigned int func, unsigned int where)
{
@@ -297,17 +339,22 @@ pci_config_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u
}
}
-struct pci_ops mt7621_pci_ops = {
- .read = pci_config_read,
- .write = pci_config_write,
-};
+static void __iomem *mt7621_pcie_map_bus(struct pci_bus *bus,
+ unsigned int devfn, int where)
+{
+ struct mt7621_pcie *pcie = bus->sysdata;
+ u32 address = mt7621_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
+ PCI_FUNC(devfn), where);
+
+ writel(address, pcie->base + RALINK_PCI_CONFIG_ADDR);
+
+ return pcie->base + RALINK_PCI_CONFIG_DATA_VIRTUAL_REG + (where & 3);
+}
-static struct resource mt7621_res_pci_mem1;
-static struct resource mt7621_res_pci_io1;
-static struct pci_controller mt7621_controller = {
- .pci_ops = &mt7621_pci_ops,
- .mem_resource = &mt7621_res_pci_mem1,
- .io_resource = &mt7621_res_pci_io1,
+struct pci_ops mt7621_pci_ops = {
+ .map_bus = mt7621_pcie_map_bus,
+ .read = pci_generic_config_read,
+ .write = pci_generic_config_write,
};
static void
@@ -463,9 +510,10 @@ set_phy_for_ssc(void)
set_pcie_phy((u32 *)(RALINK_PCIEPHY_P2_CTL_OFFSET + 0x000), 4, 1, 0x00); // rg_pe1_frc_phy_en //Force Port 0 disable control
}
-void setup_cm_memory_region(struct resource *mem_resource)
+static void setup_cm_memory_region(struct resource *mem_resource)
{
resource_size_t mask;
+
if (mips_cps_numiocu(0)) {
/* FIXME: hardware doesn't accept mask values with 1s after
* 0s (e.g. 0xffef), so it would be great to warn if that's
@@ -480,14 +528,142 @@ void setup_cm_memory_region(struct resource *mem_resource)
}
}
+static int mt7621_pci_parse_request_of_pci_ranges(struct mt7621_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct device_node *node = dev->of_node;
+ struct of_pci_range_parser parser;
+ struct of_pci_range range;
+ int err;
+
+ if (of_pci_range_parser_init(&parser, node)) {
+ dev_err(dev, "missing \"ranges\" property\n");
+ return -EINVAL;
+ }
+
+ for_each_of_pci_range(&parser, &range) {
+ struct resource *res = NULL;
+
+ switch (range.flags & IORESOURCE_TYPE_BITS) {
+ case IORESOURCE_IO:
+ ioremap(range.cpu_addr, range.size);
+ res = &pcie->io;
+ pcie->offset.io = 0x00000000UL;
+ break;
+ case IORESOURCE_MEM:
+ res = &pcie->mem;
+ pcie->offset.mem = 0x00000000UL;
+ break;
+ }
+
+ if (res != NULL)
+ of_pci_range_to_resource(&range, node, res);
+ }
+
+ err = of_pci_parse_bus_range(node, &pcie->busn);
+ if (err < 0) {
+ dev_err(dev, "failed to parse bus ranges property: %d\n", err);
+ pcie->busn.name = node->name;
+ pcie->busn.start = 0;
+ pcie->busn.end = 0xff;
+ pcie->busn.flags = IORESOURCE_BUS;
+ }
+
+ return 0;
+}
+
+static int mt7621_pcie_parse_dt(struct mt7621_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct device_node *node = dev->of_node;
+ struct resource regs;
+ const char *type;
+ int err;
+
+ type = of_get_property(node, "device_type", NULL);
+ if (!type || strcmp(type, "pci") != 0) {
+ dev_err(dev, "invalid \"device_type\" %s\n", type);
+ return -EINVAL;
+ }
+
+ err = of_address_to_resource(node, 0, &regs);
+ if (err) {
+ dev_err(dev, "missing \"reg\" property\n");
+ return err;
+ }
+
+ pcie->base = devm_ioremap_resource(dev, &regs);
+ if (IS_ERR(pcie->base))
+ return PTR_ERR(pcie->base);
+
+ return 0;
+}
+
+static int mt7621_pcie_request_resources(struct mt7621_pcie *pcie,
+ struct list_head *res)
+{
+ struct device *dev = pcie->dev;
+ int err;
+
+ pci_add_resource_offset(res, &pcie->io, pcie->offset.io);
+ pci_add_resource_offset(res, &pcie->mem, pcie->offset.mem);
+ pci_add_resource(res, &pcie->busn);
+
+ err = devm_request_pci_bus_resources(dev, res);
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static int mt7621_pcie_register_host(struct pci_host_bridge *host,
+ struct list_head *res)
+{
+ struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
+
+ list_splice_init(res, &host->windows);
+ host->busnr = pcie->busn.start;
+ host->dev.parent = pcie->dev;
+ host->ops = &mt7621_pci_ops;
+ host->map_irq = pcibios_map_irq;
+ host->swizzle_irq = pci_common_swizzle;
+ host->sysdata = pcie;
+
+ return pci_host_probe(host);
+}
+
static int mt7621_pci_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
+ struct mt7621_pcie *pcie;
+ struct pci_host_bridge *bridge;
+ int err;
unsigned long val = 0;
+ LIST_HEAD(res);
+
+ if (!dev->of_node)
+ return -ENODEV;
+
+ bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
+ if (!bridge)
+ return -ENODEV;
+ pcie = pci_host_bridge_priv(bridge);
+ pcie->dev = dev;
+ platform_set_drvdata(pdev, pcie);
+ INIT_LIST_HEAD(&pcie->ports);
+
+ err = mt7621_pcie_parse_dt(pcie);
+ if (err) {
+ dev_err(dev, "Parsing DT failed\n");
+ return err;
+ }
+
+ /* set resources limits */
iomem_resource.start = 0;
- iomem_resource.end = ~0;
+ iomem_resource.end = ~0UL; /* no limit */
ioport_resource.start = 0;
- ioport_resource.end = ~0;
+ ioport_resource.end = ~0UL; /* no limit */
val = RALINK_PCIE0_RST;
val |= RALINK_PCIE1_RST;
@@ -665,11 +841,27 @@ pcie(2/1/0) link status pcie2_num pcie1_num pcie0_num
write_config(0, 0, 0, 0x70c, val);
}
- pci_load_of_ranges(&mt7621_controller, pdev->dev.of_node);
- setup_cm_memory_region(mt7621_controller.mem_resource);
- register_pci_controller(&mt7621_controller);
- return 0;
+ err = mt7621_pci_parse_request_of_pci_ranges(pcie);
+ if (err) {
+ dev_err(dev, "Error requesting pci resources from ranges");
+ return err;
+ }
+
+ setup_cm_memory_region(&pcie->mem);
+
+ err = mt7621_pcie_request_resources(pcie, &res);
+ if (err) {
+ dev_err(dev, "Error requesting resources\n");
+ return err;
+ }
+ err = mt7621_pcie_register_host(bridge, &res);
+ if (err) {
+ dev_err(dev, "Error registering host\n");
+ return err;
+ }
+
+ return 0;
}
int pcibios_plat_dev_init(struct pci_dev *dev)
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.