[PATCH u-boot-marvell 3/9] pci: pci_mvebu: Fix PCIe MEM and IO resources assignment and mbus mapping
Pali Rohár
pali at kernel.org
Tue Dec 21 12:20:13 CET 2021
Do not call pci_set_region() for resources which were not properly mapped.
This prevents U-Boot to access unmapped memory space.
Update MBUS_PCI_MEM_SIZE and MBUS_PCI_IO_SIZE macros to cover all PCIe MEM
and IO ranges. Previously these macros covered only address ranges for the
first PCIe port. Between MBUS_PCI_IO_BASE and MBUS_PCI_MEM_BASE there is
space for six 128 MB long address ranges. So set MBUS_PCI_MEM_SIZE to value
of 6*128 MB. Similarly set MBUS_PCI_IO_SIZE to 6*64 KB.
Function resource_size() returns zero when start address is 0 and end
address is -1. So set invalid resources to these values to indicate that
resource has no mapping.
Split global PCIe MEM and IO resources (defined by MBUS_PCI_*_* macros)
into PCIe ports in mvebu_pcie_bind() function which allocates per-port
based struct mvebu_pcie, instead of using global state variables
mvebu_pcie_membase and mvebu_pcie_iobase. This makes pci_mvebu.c driver
independent of global static variables (which store the state of
allocation) and allows to bind and unbind the driver more times.
Signed-off-by: Pali Rohár <pali at kernel.org>
Signed-off-by: Marek Behún <marek.behun at nic.cz>
---
arch/arm/mach-mvebu/include/mach/cpu.h | 5 +-
drivers/pci/pci_mvebu.c | 84 ++++++++++++++++++--------
2 files changed, 62 insertions(+), 27 deletions(-)
diff --git a/arch/arm/mach-mvebu/include/mach/cpu.h b/arch/arm/mach-mvebu/include/mach/cpu.h
index a7a62c7e7d53..b99d86a87a03 100644
--- a/arch/arm/mach-mvebu/include/mach/cpu.h
+++ b/arch/arm/mach-mvebu/include/mach/cpu.h
@@ -74,10 +74,11 @@ enum {
/*
* Default Device Address MAP BAR values
*/
+#define MBUS_PCI_MAX_PORTS 6
#define MBUS_PCI_MEM_BASE MVEBU_SDRAM_SIZE_MAX
-#define MBUS_PCI_MEM_SIZE (128 << 20)
+#define MBUS_PCI_MEM_SIZE ((MBUS_PCI_MAX_PORTS * 128) << 20)
#define MBUS_PCI_IO_BASE 0xF1100000
-#define MBUS_PCI_IO_SIZE (64 << 10)
+#define MBUS_PCI_IO_SIZE ((MBUS_PCI_MAX_PORTS * 64) << 10)
#define MBUS_SPI_BASE 0xF4000000
#define MBUS_SPI_SIZE (8 << 20)
#define MBUS_DFX_BASE 0xF6000000
diff --git a/drivers/pci/pci_mvebu.c b/drivers/pci/pci_mvebu.c
index 9248cbc294ce..eaaa6cbe326d 100644
--- a/drivers/pci/pci_mvebu.c
+++ b/drivers/pci/pci_mvebu.c
@@ -25,6 +25,7 @@
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/mbus.h>
+#include <linux/sizes.h>
/* PCIe unit register offsets */
#define SELECT(x, n) ((x >> n) & 1UL)
@@ -89,14 +90,6 @@ struct mvebu_pcie {
u32 cfgcache[(0x3c - 0x10) / 4];
};
-/*
- * MVEBU PCIe controller needs MEMORY and I/O BARs to be mapped
- * into SoCs address space. Each controller will map 128M of MEM
- * and 64K of I/O space when registered.
- */
-static void __iomem *mvebu_pcie_membase = (void __iomem *)MBUS_PCI_MEM_BASE;
-static void __iomem *mvebu_pcie_iobase = (void __iomem *)MBUS_PCI_IO_BASE;
-
static inline bool mvebu_pcie_link_up(struct mvebu_pcie *pcie)
{
u32 val;
@@ -442,26 +435,24 @@ static int mvebu_pcie_probe(struct udevice *dev)
mvebu_pcie_set_local_bus_nr(pcie, 0);
mvebu_pcie_set_local_dev_nr(pcie, 1);
- pcie->mem.start = (u32)mvebu_pcie_membase;
- pcie->mem.end = pcie->mem.start + MBUS_PCI_MEM_SIZE - 1;
- mvebu_pcie_membase += MBUS_PCI_MEM_SIZE;
-
- if (mvebu_mbus_add_window_by_id(pcie->mem_target, pcie->mem_attr,
+ if (resource_size(&pcie->mem) &&
+ mvebu_mbus_add_window_by_id(pcie->mem_target, pcie->mem_attr,
(phys_addr_t)pcie->mem.start,
resource_size(&pcie->mem))) {
printf("PCIe unable to add mbus window for mem at %08x+%08x\n",
(u32)pcie->mem.start, (unsigned)resource_size(&pcie->mem));
+ pcie->mem.start = 0;
+ pcie->mem.end = -1;
}
- pcie->io.start = (u32)mvebu_pcie_iobase;
- pcie->io.end = pcie->io.start + MBUS_PCI_IO_SIZE - 1;
- mvebu_pcie_iobase += MBUS_PCI_IO_SIZE;
-
- if (mvebu_mbus_add_window_by_id(pcie->io_target, pcie->io_attr,
+ if (resource_size(&pcie->io) &&
+ mvebu_mbus_add_window_by_id(pcie->io_target, pcie->io_attr,
(phys_addr_t)pcie->io.start,
resource_size(&pcie->io))) {
printf("PCIe unable to add mbus window for IO at %08x+%08x\n",
(u32)pcie->io.start, (unsigned)resource_size(&pcie->io));
+ pcie->io.start = 0;
+ pcie->io.end = -1;
}
/* Setup windows and configure host bridge */
@@ -470,13 +461,23 @@ static int mvebu_pcie_probe(struct udevice *dev)
/* PCI memory space */
pci_set_region(hose->regions + 0, pcie->mem.start,
pcie->mem.start, resource_size(&pcie->mem), PCI_REGION_MEM);
- pci_set_region(hose->regions + 1,
- 0, 0,
- gd->ram_size,
- PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
- pci_set_region(hose->regions + 2, pcie->io.start,
- pcie->io.start, resource_size(&pcie->io), PCI_REGION_IO);
- hose->region_count = 3;
+ hose->region_count = 1;
+
+ if (resource_size(&pcie->mem)) {
+ pci_set_region(hose->regions + hose->region_count,
+ pcie->mem.start, pcie->mem.start,
+ resource_size(&pcie->mem),
+ PCI_REGION_MEM);
+ hose->region_count++;
+ }
+
+ if (resource_size(&pcie->io)) {
+ pci_set_region(hose->regions + hose->region_count,
+ pcie->io.start, pcie->io.start,
+ resource_size(&pcie->io),
+ PCI_REGION_IO);
+ hose->region_count++;
+ }
/* PCI Bridge support 32-bit I/O and 64-bit prefetch mem addressing */
pcie->cfgcache[(PCI_IO_BASE - 0x10) / 4] =
@@ -637,6 +638,8 @@ static int mvebu_pcie_bind(struct udevice *parent)
struct mvebu_pcie *pcie;
struct uclass_driver *drv;
struct udevice *dev;
+ struct resource mem;
+ struct resource io;
ofnode subnode;
/* Lookup pci driver */
@@ -646,6 +649,11 @@ static int mvebu_pcie_bind(struct udevice *parent)
return -ENOENT;
}
+ mem.start = MBUS_PCI_MEM_BASE;
+ mem.end = MBUS_PCI_MEM_BASE + MBUS_PCI_MEM_SIZE - 1;
+ io.start = MBUS_PCI_IO_BASE;
+ io.end = MBUS_PCI_IO_BASE + MBUS_PCI_IO_SIZE - 1;
+
ofnode_for_each_subnode(subnode, dev_ofnode(parent)) {
if (!ofnode_is_available(subnode))
continue;
@@ -654,6 +662,32 @@ static int mvebu_pcie_bind(struct udevice *parent)
if (!pcie)
return -ENOMEM;
+ /*
+ * MVEBU PCIe controller needs MEMORY and I/O BARs to be mapped
+ * into SoCs address space. Each controller will map 128M of MEM
+ * and 64K of I/O space when registered.
+ */
+
+ if (resource_size(&mem) >= SZ_128M) {
+ pcie->mem.start = mem.start;
+ pcie->mem.end = mem.start + SZ_128M - 1;
+ mem.start += SZ_128M;
+ } else {
+ printf("PCIe unable to assign mbus window for mem\n");
+ pcie->mem.start = 0;
+ pcie->mem.end = -1;
+ }
+
+ if (resource_size(&io) >= SZ_64K) {
+ pcie->io.start = io.start;
+ pcie->io.end = io.start + SZ_64K - 1;
+ io.start += SZ_64K;
+ } else {
+ printf("PCIe unable to assign mbus window for io\n");
+ pcie->io.start = 0;
+ pcie->io.end = -1;
+ }
+
/* Create child device UCLASS_PCI and bind it */
device_bind(parent, &pcie_mvebu_drv, pcie->name, pcie, subnode,
&dev);
--
2.20.1
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