#define PCIE_DEV_REV_OFF 0x0008
#define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3))
#define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3))
+#define PCIE_EXP_ROM_BAR_OFF 0x0030
#define PCIE_CAPAB_OFF 0x0060
#define PCIE_CTRL_STAT_OFF 0x0068
#define PCIE_HEADER_LOG_4_OFF 0x0128
#define PCIE_CONF_BUS(b) (((b) & 0xff) << 16)
#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11)
#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8)
-#define PCIE_CONF_ADDR(dev, reg) \
- (PCIE_CONF_BUS(PCI_BUS(dev)) | PCIE_CONF_DEV(PCI_DEV(dev)) | \
- PCIE_CONF_FUNC(PCI_FUNC(dev)) | PCIE_CONF_REG(reg) | \
+#define PCIE_CONF_ADDR(b, d, f, reg) \
+ (PCIE_CONF_BUS(b) | PCIE_CONF_DEV(d) | \
+ PCIE_CONF_FUNC(f) | PCIE_CONF_REG(reg) | \
PCIE_CONF_ADDR_EN)
#define PCIE_CONF_DATA_OFF 0x18fc
#define PCIE_MASK_OFF 0x1910
int devfn;
u32 lane_mask;
int first_busno;
- int local_dev;
+ int sec_busno;
char name[16];
unsigned int mem_target;
unsigned int mem_attr;
unsigned int io_target;
unsigned int io_attr;
+ u32 cfgcache[0x34 - 0x10];
};
/*
return container_of(hose, struct mvebu_pcie, hose);
}
-static int mvebu_pcie_valid_addr(struct mvebu_pcie *pcie, pci_dev_t bdf)
+static bool mvebu_pcie_valid_addr(struct mvebu_pcie *pcie,
+ int busno, int dev, int func)
{
- /*
- * 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;
+ /* On primary bus is only one PCI Bridge */
+ if (busno == pcie->first_busno && (dev != 0 || func != 0))
+ return false;
+
+ /* On secondary bus can be only one PCIe device */
+ if (busno == pcie->sec_busno && dev != 0)
+ return false;
- return 1;
+ return true;
}
static int mvebu_pcie_read_config(const struct udevice *bus, pci_dev_t bdf,
enum pci_size_t size)
{
struct mvebu_pcie *pcie = dev_get_plat(bus);
- u32 data;
+ int busno = PCI_BUS(bdf) - dev_seq(bus);
+ u32 addr, data;
debug("PCIE CFG read: (b,d,f)=(%2d,%2d,%2d) ",
PCI_BUS(bdf), PCI_DEV(bdf), PCI_FUNC(bdf));
- if (!mvebu_pcie_valid_addr(pcie, bdf)) {
+ if (!mvebu_pcie_valid_addr(pcie, busno, PCI_DEV(bdf), PCI_FUNC(bdf))) {
debug("- out of range\n");
*valuep = pci_get_ff(size);
return 0;
}
+ /*
+ * mvebu has different internal registers mapped into PCI config space
+ * in range 0x10-0x34 for PCI bridge, so do not access PCI config space
+ * for this range and instead read content from driver virtual cfgcache
+ */
+ if (busno == pcie->first_busno && offset >= 0x10 && offset < 0x34) {
+ data = pcie->cfgcache[(offset - 0x10) / 4];
+ debug("(addr,size,val)=(0x%04x, %d, 0x%08x) from cfgcache\n",
+ offset, size, data);
+ *valuep = pci_conv_32_to_size(data, offset, size);
+ return 0;
+ } else if (busno == pcie->first_busno &&
+ (offset & ~3) == PCI_ROM_ADDRESS1) {
+ /* mvebu has Expansion ROM Base Address (0x38) at offset 0x30 */
+ offset -= PCI_ROM_ADDRESS1 - PCIE_EXP_ROM_BAR_OFF;
+ }
+
+ /*
+ * PCI bridge is device 0 at primary bus but mvebu has it mapped on
+ * secondary bus with device number 1.
+ */
+ if (busno == pcie->first_busno)
+ addr = PCIE_CONF_ADDR(pcie->sec_busno, 1, 0, offset);
+ else
+ addr = PCIE_CONF_ADDR(busno, PCI_DEV(bdf), PCI_FUNC(bdf), offset);
+
/* write address */
- writel(PCIE_CONF_ADDR(bdf, offset), pcie->base + PCIE_CONF_ADDR_OFF);
+ writel(addr, pcie->base + PCIE_CONF_ADDR_OFF);
/* read data */
switch (size) {
return -EINVAL;
}
+ if (busno == pcie->first_busno &&
+ (offset & ~3) == (PCI_HEADER_TYPE & ~3)) {
+ /*
+ * Change Header Type of PCI Bridge device to Type 1
+ * (0x01, used by PCI Bridges) because mvebu reports
+ * Type 0 (0x00, used by Upstream and Endpoint devices).
+ */
+ data = pci_conv_size_to_32(data, 0, offset, size);
+ data &= ~0x007f0000;
+ data |= PCI_HEADER_TYPE_BRIDGE << 16;
+ data = pci_conv_32_to_size(data, offset, size);
+ }
+
debug("(addr,size,val)=(0x%04x, %d, 0x%08x)\n", offset, size, data);
*valuep = data;
enum pci_size_t size)
{
struct mvebu_pcie *pcie = dev_get_plat(bus);
- u32 data;
+ int busno = PCI_BUS(bdf) - dev_seq(bus);
+ u32 addr, data;
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);
- if (!mvebu_pcie_valid_addr(pcie, bdf)) {
+ if (!mvebu_pcie_valid_addr(pcie, busno, PCI_DEV(bdf), PCI_FUNC(bdf))) {
debug("- out of range\n");
return 0;
}
+ /*
+ * mvebu has different internal registers mapped into PCI config space
+ * in range 0x10-0x34 for PCI bridge, so do not access PCI config space
+ * for this range and instead write content to driver virtual cfgcache
+ */
+ if (busno == pcie->first_busno && offset >= 0x10 && offset < 0x34) {
+ debug("Writing to cfgcache only\n");
+ data = pcie->cfgcache[(offset - 0x10) / 4];
+ data = pci_conv_size_to_32(data, value, offset, size);
+ /* mvebu PCI bridge does not have configurable bars */
+ if ((offset & ~3) == PCI_BASE_ADDRESS_0 ||
+ (offset & ~3) == PCI_BASE_ADDRESS_1)
+ data = 0x0;
+ pcie->cfgcache[(offset - 0x10) / 4] = data;
+ /* mvebu has its own way how to set PCI primary bus number */
+ if (offset == PCI_PRIMARY_BUS) {
+ pcie->first_busno = data & 0xff;
+ debug("Primary bus number was changed to %d\n",
+ pcie->first_busno);
+ }
+ /* mvebu has its own way how to set PCI secondary bus number */
+ if (offset == PCI_SECONDARY_BUS ||
+ (offset == PCI_PRIMARY_BUS && size != PCI_SIZE_8)) {
+ pcie->sec_busno = (data >> 8) & 0xff;
+ mvebu_pcie_set_local_bus_nr(pcie, pcie->sec_busno);
+ debug("Secondary bus number was changed to %d\n",
+ pcie->sec_busno);
+ }
+ return 0;
+ } else if (busno == pcie->first_busno &&
+ (offset & ~3) == PCI_ROM_ADDRESS1) {
+ /* mvebu has Expansion ROM Base Address (0x38) at offset 0x30 */
+ offset -= PCI_ROM_ADDRESS1 - PCIE_EXP_ROM_BAR_OFF;
+ }
+
+ /*
+ * PCI bridge is device 0 at primary bus but mvebu has it mapped on
+ * secondary bus with device number 1.
+ */
+ if (busno == pcie->first_busno)
+ addr = PCIE_CONF_ADDR(pcie->sec_busno, 1, 0, offset);
+ else
+ addr = PCIE_CONF_ADDR(busno, PCI_DEV(bdf), PCI_FUNC(bdf), offset);
+
/* write address */
- writel(PCIE_CONF_ADDR(bdf, offset), pcie->base + PCIE_CONF_ADDR_OFF);
+ writel(addr, pcie->base + PCIE_CONF_ADDR_OFF);
/* write data */
switch (size) {
struct mvebu_pcie *pcie = dev_get_plat(dev);
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *hose = dev_get_uclass_priv(ctlr);
- int bus = dev_seq(dev);
u32 reg;
debug("%s: PCIe %d.%d - up, base %08x\n", __func__,
pcie->port, pcie->lane, (u32)pcie->base);
- /* Read Id info and local bus/dev */
- debug("direct conf read %08x, local bus %d, local dev %d\n",
- readl(pcie->base), mvebu_pcie_get_local_bus_nr(pcie),
- mvebu_pcie_get_local_dev_nr(pcie));
-
- pcie->first_busno = bus;
- pcie->local_dev = 1;
+ /*
+ * Change Class Code of PCI Bridge device to PCI Bridge (0x600400)
+ * because default value is Memory controller (0x508000) which
+ * U-Boot cannot recognize as P2P Bridge.
+ *
+ * Note that this mvebu PCI Bridge does not have compliant Type 1
+ * Configuration Space. Header Type is reported as Type 0 and in
+ * range 0x10-0x34 it has aliased internal mvebu registers 0x10-0x34
+ * (e.g. PCIE_BAR_LO_OFF) and register 0x38 is reserved.
+ *
+ * Driver for this range redirects access to virtual cfgcache[] buffer
+ * which avoids changing internal mvebu registers. And changes Header
+ * Type response value to Type 1.
+ */
+ reg = readl(pcie->base + PCIE_DEV_REV_OFF);
+ reg &= ~0xffffff00;
+ reg |= (PCI_CLASS_BRIDGE_PCI << 8) << 8;
+ writel(reg, pcie->base + PCIE_DEV_REV_OFF);
- mvebu_pcie_set_local_bus_nr(pcie, bus);
- mvebu_pcie_set_local_dev_nr(pcie, pcie->local_dev);
+ /*
+ * mvebu uses local bus number and local device number to determinate
+ * type of config request. Type 0 is used if target bus number equals
+ * local bus number and target device number differs from local device
+ * number. Type 1 is used if target bus number differs from local bus
+ * number. And when target bus number equals local bus number and
+ * target device equals local device number then request is routed to
+ * PCI Bridge which represent local PCIe Root Port.
+ *
+ * It means that PCI primary and secondary buses shares one bus number
+ * which is configured via local bus number. Determination if config
+ * request should go to primary or secondary bus is done based on local
+ * device number.
+ *
+ * PCIe is point-to-point bus, so at secondary bus is always exactly one
+ * device with number 0. So set local device number to 1, it would not
+ * conflict with any device on secondary bus number and will ensure that
+ * accessing secondary bus and all buses behind secondary would work
+ * automatically and correctly. Therefore this configuration of local
+ * device number implies that setting of local bus number configures
+ * secondary bus number. Set it to 0 as U-Boot CONFIG_PCI_PNP code will
+ * later configure it via config write requests to the correct value.
+ * mvebu_pcie_write_config() catches config write requests which tries
+ * to change primary/secondary bus number and correctly updates local
+ * bus number based on new secondary bus number.
+ *
+ * With this configuration is PCI Bridge available at secondary bus as
+ * device number 1. But it must be available at primary bus as device
+ * number 0. So in mvebu_pcie_read_config() and mvebu_pcie_write_config()
+ * functions rewrite address to the real one when accessing primary bus.
+ */
+ 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 + PCIE_MEM_SIZE - 1;
writel(SOC_REGS_PHY_BASE, pcie->base + PCIE_BAR_LO_OFF(0));
writel(0, pcie->base + PCIE_BAR_HI_OFF(0));
+ /* PCI Bridge support 32-bit I/O and 64-bit prefetch mem addressing */
+ pcie->cfgcache[(PCI_IO_BASE - 0x10) / 4] =
+ PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8);
+ pcie->cfgcache[(PCI_PREF_MEMORY_BASE - 0x10) / 4] =
+ PCI_PREF_RANGE_TYPE_64 | (PCI_PREF_RANGE_TYPE_64 << 16);
+
return 0;
}
projects / u-boot.git / commitdiff
