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PCI: brcmstb: Augment driver for MIPs SOCs 

The current brcmstb driver works for Arm and Arm64.  A few things are
modified here for us to support MIPs as well.

  o There are four outbound range register groups and each directs a window
    of up to 128MB.  Even though there are four 128MB DT "ranges" in the
    bmips PCIe DT node, these ranges are contiguous and are collapsed into
    a single range by the OF range parser.  Now the driver assumes a single
    range -- for MIPs only -- and splits it back into 128MB sizes.

  o For bcm7425, the config space accesses must be 32-bit reads or
    writes.  In addition, the 4k config space register array is missing
    and not used.

  o The registers for the upper 32-bits of the outbound window address do
    not exist.

  o Burst size must be set to 256 (this refers to an internal bus).

Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Jim Quinlan 2021-12-09 15:47:25 -05:00 committed by Thomas Bogendoerfer
parent d552ddeaab
commit aa8589aac8
2 changed files with 79 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/pci/controller/Kconfig
View File

@ -274,7 +274,7 @@ config PCIE_BRCMSTB
BMIPS_GENERIC || COMPILE_TEST
depends on OF
depends on PCI_MSI_IRQ_DOMAIN
default ARCH_BRCMSTB
default ARCH_BRCMSTB || BMIPS_GENERIC
help
Say Y here to enable PCIe host controller support for
Broadcom STB based SoCs, like the Raspberry Pi 4.

82
drivers/pci/controller/pcie-brcmstb.c
View File

@ -118,6 +118,7 @@
#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
#define PCIE_BMIPS_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x00800000
#define PCIE_INTR2_CPU_BASE 0x4300
@ -205,6 +206,8 @@ enum {
enum pcie_type {
GENERIC,
BCM7425,
BCM7435,
BCM4908,
BCM7278,
BCM2711,
@ -223,6 +226,12 @@ static const int pcie_offsets[] = {
[EXT_CFG_DATA] = 0x9004,
};
static const int pcie_offsets_bmips_7425[] = {
[RGR1_SW_INIT_1] = 0x8010,
[EXT_CFG_INDEX] = 0x8300,
[EXT_CFG_DATA] = 0x8304,
};
static const struct pcie_cfg_data generic_cfg = {
.offsets = pcie_offsets,
.type = GENERIC,
@ -230,6 +239,20 @@ static const struct pcie_cfg_data generic_cfg = {
.bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
};
static const struct pcie_cfg_data bcm7425_cfg = {
.offsets = pcie_offsets_bmips_7425,
.type = BCM7425,
.perst_set = brcm_pcie_perst_set_generic,
.bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
};
static const struct pcie_cfg_data bcm7435_cfg = {
.offsets = pcie_offsets,
.type = BCM7435,
.perst_set = brcm_pcie_perst_set_generic,
.bridge_sw_init_set = brcm_pcie_bridge_sw_init_set_generic,
};
static const struct pcie_cfg_data bcm4908_cfg = {
.offsets = pcie_offsets,
.type = BCM4908,
@ -297,6 +320,11 @@ struct brcm_pcie {
void (*bridge_sw_init_set)(struct brcm_pcie *pcie, u32 val);
};
static inline bool is_bmips(const struct brcm_pcie *pcie)
{
return pcie->type == BCM7435 || pcie->type == BCM7425;
}
/*
* This is to convert the size of the inbound "BAR" region to the
* non-linear values of PCIE_X_MISC_RC_BAR[123]_CONFIG_LO.SIZE
@ -443,6 +471,9 @@ static void brcm_pcie_set_outbound_win(struct brcm_pcie *pcie,
PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK);
writel(tmp, pcie->base + PCIE_MEM_WIN0_BASE_LIMIT(win));
if (is_bmips(pcie))
return;
/* Write the cpu & limit addr upper bits */
high_addr_shift =
HWEIGHT32(PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK);
@ -718,12 +749,35 @@ static void __iomem *brcm_pcie_map_conf(struct pci_bus *bus, unsigned int devfn,
return base + PCIE_EXT_CFG_DATA + where;
}
static void __iomem *brcm_pcie_map_conf32(struct pci_bus *bus, unsigned int devfn,
int where)
{
struct brcm_pcie *pcie = bus->sysdata;
void __iomem *base = pcie->base;
int idx;
/* Accesses to the RC go right to the RC registers if slot==0 */
if (pci_is_root_bus(bus))
return PCI_SLOT(devfn) ? NULL : base + (where & ~0x3);
/* For devices, write to the config space index register */
idx = PCIE_ECAM_OFFSET(bus->number, devfn, (where & ~3));
writel(idx, base + IDX_ADDR(pcie));
return base + DATA_ADDR(pcie);
}
static struct pci_ops brcm_pcie_ops = {
.map_bus = brcm_pcie_map_conf,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
};
static struct pci_ops brcm_pcie_ops32 = {
.map_bus = brcm_pcie_map_conf32,
.read = pci_generic_config_read32,
.write = pci_generic_config_write32,
};
static inline void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie, u32 val)
{
u32 tmp, mask = RGR1_SW_INIT_1_INIT_GENERIC_MASK;
@ -883,7 +937,10 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
pcie->bridge_sw_init_set(pcie, 0);
tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
tmp &= ~PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK;
if (is_bmips(pcie))
tmp &= ~PCIE_BMIPS_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK;
else
tmp &= ~PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK;
writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
/* Wait for SerDes to be stable */
usleep_range(100, 200);
@ -893,8 +950,10 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
* is encoded as 0=128, 1=256, 2=512, 3=Rsvd, for BCM7278 it
* is encoded as 0=Rsvd, 1=128, 2=256, 3=512.
*/
if (pcie->type == BCM2711)
burst = 0x0; /* 128B */
if (is_bmips(pcie))
burst = 0x1; /* 256 bytes */
else if (pcie->type == BCM2711)
burst = 0x0; /* 128 bytes */
else if (pcie->type == BCM7278)
burst = 0x3; /* 512 bytes */
else
@ -988,6 +1047,19 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
return -EINVAL;
}
if (is_bmips(pcie)) {
u64 start = res->start;
unsigned int j, nwins = resource_size(res) / SZ_128M;
/* bmips PCIe outbound windows have a 128MB max size */
if (nwins > BRCM_NUM_PCIE_OUT_WINS)
nwins = BRCM_NUM_PCIE_OUT_WINS;
for (j = 0; j < nwins; j++, start += SZ_128M)
brcm_pcie_set_outbound_win(pcie, j, start,
start - entry->offset,
SZ_128M);
break;
}
brcm_pcie_set_outbound_win(pcie, num_out_wins, res->start,
res->start - entry->offset,
resource_size(res));
@ -1226,6 +1298,8 @@ static const struct of_device_id brcm_pcie_match[] = {
{ .compatible = "brcm,bcm7278-pcie", .data = &bcm7278_cfg },
{ .compatible = "brcm,bcm7216-pcie", .data = &bcm7278_cfg },
{ .compatible = "brcm,bcm7445-pcie", .data = &generic_cfg },
{ .compatible = "brcm,bcm7435-pcie", .data = &bcm7435_cfg },
{ .compatible = "brcm,bcm7425-pcie", .data = &bcm7425_cfg },
{},
};
@ -1315,7 +1389,7 @@ static int brcm_pcie_probe(struct platform_device *pdev)
}
}
bridge->ops = &brcm_pcie_ops;
bridge->ops = pcie->type == BCM7425 ? &brcm_pcie_ops32 : &brcm_pcie_ops;
bridge->sysdata = pcie;
platform_set_drvdata(pdev, pcie);