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pci: pci_mvebu: refactor validation of addresses for config access

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Refactor validation of bdf parameter in mvebu_pcie_read/write_config
functions.

We can simplify the code by putting the validation into separate
function.

Also there are always only two devices visible on local bus:
* on slot configured by function mvebu_pcie_set_local_dev_nr()
  (by default this register is set to 0) there is a
  "Marvell Memory controller", which isn't useful in root complex
  mode,
* on all other slots the real PCIe card connected to the PCIe slot.

We can simplify the code even more by simply allowing access only to
the real PCIe card.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Cc: Stefan Roese <sr@denx.de>
Cc: Phil Sutter <phil@nwl.cc>
Cc: Mario Six <mario.six@gdsys.cc>
Cc: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Marek Behún 2021-02-08 23:01:40 +01:00 committed by Stefan Roese
parent 26f7a76ef9
commit 10eb2cc344
1 changed files with 31 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
drivers/pci/pci_mvebu.c
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@ -79,7 +79,8 @@ struct mvebu_pcie {
u32 lane;
int devfn;
u32 lane_mask;
pci_dev_t dev;
int first_busno;
int local_dev;
char name[16];
unsigned int mem_target;
unsigned int mem_attr;
@ -144,27 +145,36 @@ static inline struct mvebu_pcie *hose_to_pcie(struct pci_controller *hose)
return container_of(hose, struct mvebu_pcie, hose);
}
static int mvebu_pcie_valid_addr(struct mvebu_pcie *pcie, pci_dev_t bdf)
{
/*
* There are two devices visible on local bus:
* * on slot configured by function mvebu_pcie_set_local_dev_nr()
* (by default this register is set to 0) there is a
* "Marvell Memory controller", which isn't useful in root complex
* mode,
* * on all other slots the real PCIe card connected to the PCIe slot.
*
* We therefore allow access only to the real PCIe card.
*/
if (PCI_BUS(bdf) == pcie->first_busno &&
PCI_DEV(bdf) != !pcie->local_dev)
return 0;
return 1;
}
static int mvebu_pcie_read_config(const struct udevice *bus, pci_dev_t bdf,
uint offset, ulong *valuep,
enum pci_size_t size)
{
struct mvebu_pcie *pcie = dev_get_plat(bus);
int local_bus = PCI_BUS(pcie->dev);
int local_dev = PCI_DEV(pcie->dev);
u32 data;
debug("PCIE CFG read: loc_bus=%d loc_dev=%d (b,d,f)=(%2d,%2d,%2d) ",
local_bus, local_dev, PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
debug("PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
/* Don't access the local host controller via this API */
if (PCI_BUS(bdf) == local_bus && PCI_DEV(bdf) == local_dev) {
debug("- skipping host controller\n");
*valuep = pci_get_ff(size);
return 0;
}
/* If local dev is 0, the first other dev can only be 1 */
if (PCI_BUS(bdf) == local_bus && local_dev == 0 && PCI_DEV(bdf) != 1) {
if (!mvebu_pcie_valid_addr(pcie, bdf)) {
debug("- out of range\n");
*valuep = pci_get_ff(size);
return 0;
@ -186,22 +196,13 @@ static int mvebu_pcie_write_config(struct udevice *bus, pci_dev_t bdf,
enum pci_size_t size)
{
struct mvebu_pcie *pcie = dev_get_plat(bus);
int local_bus = PCI_BUS(pcie->dev);
int local_dev = PCI_DEV(pcie->dev);
u32 data;
debug("PCIE CFG write: loc_bus=%d loc_dev=%d (b,d,f)=(%2d,%2d,%2d) ",
local_bus, local_dev, PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
debug("PCIE CFG write: (b,d,f)=(%2d,%2d,%2d) ",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
debug("(addr,size,val)=(0x%04x, %d, 0x%08lx)\n", offset, size, value);
/* Don't access the local host controller via this API */
if (PCI_BUS(bdf) == local_bus && PCI_DEV(bdf) == local_dev) {
debug("- skipping host controller\n");
return 0;
}
/* If local dev is 0, the first other dev can only be 1 */
if (PCI_BUS(bdf) == local_bus && local_dev == 0 && PCI_DEV(bdf) != 1) {
if (!mvebu_pcie_valid_addr(pcie, bdf)) {
debug("- out of range\n");
return 0;
}
@ -287,9 +288,11 @@ static int mvebu_pcie_probe(struct udevice *dev)
readl(pcie->base), mvebu_pcie_get_local_bus_nr(pcie),
mvebu_pcie_get_local_dev_nr(pcie));
pcie->first_busno = bus;
pcie->local_dev = 0;
mvebu_pcie_set_local_bus_nr(pcie, bus);
mvebu_pcie_set_local_dev_nr(pcie, 0);
pcie->dev = PCI_BDF(bus, 0, 0);
mvebu_pcie_set_local_dev_nr(pcie, pcie->local_dev);
pcie->mem.start = (u32)mvebu_pcie_membase;
pcie->mem.end = pcie->mem.start + PCIE_MEM_SIZE - 1;