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PCI: brcmstb: Accommodate MSI for older chips 

Older BrcmSTB chips do not have a separate register for MSI interrupts; the
MSIs are in a register that also contains unrelated interrupts.  In
addition, the interrupts lie in bits [31..24] for these legacy chips.  This
commit provides common code for both legacy and non-legacy MSI interrupt
registers.

Link: https://lore.kernel.org/r/20200911175232.19016-9-james.quinlan@broadcom.com
Signed-off-by: Jim Quinlan <jquinlan@broadcom.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
This commit is contained in:
Jim Quinlan 2020-09-11 13:52:28 -04:00 committed by Lorenzo Pieralisi
parent 52ded9e4f0
commit 3baec684a5
1 changed files with 49 additions and 21 deletions
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70
drivers/pci/controller/pcie-brcmstb.c
View File

@ -83,7 +83,8 @@
#define PCIE_MISC_MSI_BAR_CONFIG_HI 0x4048
#define PCIE_MISC_MSI_DATA_CONFIG 0x404c
#define PCIE_MISC_MSI_DATA_CONFIG_VAL 0xffe06540
#define PCIE_MISC_MSI_DATA_CONFIG_VAL_32 0xffe06540
#define PCIE_MISC_MSI_DATA_CONFIG_VAL_8 0xfff86540
#define PCIE_MISC_PCIE_CTRL 0x4064
#define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK 0x1
@ -95,6 +96,9 @@
#define PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK 0x10
#define PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK 0x40
#define PCIE_MISC_REVISION 0x406c
#define BRCM_PCIE_HW_REV_33 0x0303
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK 0xfff00000
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK 0xfff0
@ -115,10 +119,14 @@
#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_MSI_INTR2_STATUS 0x4500
#define PCIE_MSI_INTR2_CLR 0x4508
#define PCIE_MSI_INTR2_MASK_SET 0x4510
#define PCIE_MSI_INTR2_MASK_CLR 0x4514
#define PCIE_INTR2_CPU_BASE 0x4300
#define PCIE_MSI_INTR2_BASE 0x4500
/* Offsets from PCIE_INTR2_CPU_BASE and PCIE_MSI_INTR2_BASE */
#define MSI_INT_STATUS 0x0
#define MSI_INT_CLR 0x8
#define MSI_INT_MASK_SET 0x10
#define MSI_INT_MASK_CLR 0x14
#define PCIE_EXT_CFG_DATA 0x8000
@ -138,6 +146,8 @@
/* PCIe parameters */
#define BRCM_NUM_PCIE_OUT_WINS 0x4
#define BRCM_INT_PCI_MSI_NR 32
#define BRCM_INT_PCI_MSI_LEGACY_NR 8
#define BRCM_INT_PCI_MSI_SHIFT 0
/* MSI target adresses */
#define BRCM_MSI_TARGET_ADDR_LT_4GB 0x0fffffffcULL
@ -253,6 +263,12 @@ struct brcm_msi {
int irq;
/* used indicates which MSI interrupts have been alloc'd */
unsigned long used;
bool legacy;
/* Some chips have MSIs in bits [31..24] of a shared register. */
int legacy_shift;
int nr; /* No. of MSI available, depends on chip */
/* This is the base pointer for interrupt status/set/clr regs */
void __iomem *intr_base;
};
/* Internal PCIe Host Controller Information.*/
@ -463,8 +479,10 @@ static void brcm_pcie_msi_isr(struct irq_desc *desc)
msi = irq_desc_get_handler_data(desc);
dev = msi->dev;
status = readl(msi->base + PCIE_MSI_INTR2_STATUS);
for_each_set_bit(bit, &status, BRCM_INT_PCI_MSI_NR) {
status = readl(msi->intr_base + MSI_INT_STATUS);
status >>= msi->legacy_shift;
for_each_set_bit(bit, &status, msi->nr) {
virq = irq_find_mapping(msi->inner_domain, bit);
if (virq)
generic_handle_irq(virq);
@ -481,7 +499,7 @@ static void brcm_msi_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
msg->address_lo = lower_32_bits(msi->target_addr);
msg->address_hi = upper_32_bits(msi->target_addr);
msg->data = (0xffff & PCIE_MISC_MSI_DATA_CONFIG_VAL) | data->hwirq;
msg->data = (0xffff & PCIE_MISC_MSI_DATA_CONFIG_VAL_32) | data->hwirq;
}
static int brcm_msi_set_affinity(struct irq_data *irq_data,
@ -493,8 +511,9 @@ static int brcm_msi_set_affinity(struct irq_data *irq_data,
static void brcm_msi_ack_irq(struct irq_data *data)
{
struct brcm_msi *msi = irq_data_get_irq_chip_data(data);
const int shift_amt = data->hwirq + msi->legacy_shift;
writel(1 << data->hwirq, msi->base + PCIE_MSI_INTR2_CLR);
writel(1 << shift_amt, msi->intr_base + MSI_INT_CLR);
}
@ -510,7 +529,7 @@ static int brcm_msi_alloc(struct brcm_msi *msi)
int hwirq;
mutex_lock(&msi->lock);
hwirq = bitmap_find_free_region(&msi->used, BRCM_INT_PCI_MSI_NR, 0);
hwirq = bitmap_find_free_region(&msi->used, msi->nr, 0);
mutex_unlock(&msi->lock);
return hwirq;
@ -559,8 +578,7 @@ static int brcm_allocate_domains(struct brcm_msi *msi)
struct fwnode_handle *fwnode = of_node_to_fwnode(msi->np);
struct device *dev = msi->dev;
msi->inner_domain = irq_domain_add_linear(NULL, BRCM_INT_PCI_MSI_NR,
&msi_domain_ops, msi);
msi->inner_domain = irq_domain_add_linear(NULL, msi->nr, &msi_domain_ops, msi);
if (!msi->inner_domain) {
dev_err(dev, "failed to create IRQ domain\n");
return -ENOMEM;
@ -597,7 +615,10 @@ static void brcm_msi_remove(struct brcm_pcie *pcie)
static void brcm_msi_set_regs(struct brcm_msi *msi)
{
writel(0xffffffff, msi->base + PCIE_MSI_INTR2_MASK_CLR);
u32 val = __GENMASK(31, msi->legacy_shift);
writel(val, msi->intr_base + MSI_INT_MASK_CLR);
writel(val, msi->intr_base + MSI_INT_CLR);
/*
* The 0 bit of PCIE_MISC_MSI_BAR_CONFIG_LO is repurposed to MSI
@ -608,8 +629,8 @@ static void brcm_msi_set_regs(struct brcm_msi *msi)
writel(upper_32_bits(msi->target_addr),
msi->base + PCIE_MISC_MSI_BAR_CONFIG_HI);
writel(PCIE_MISC_MSI_DATA_CONFIG_VAL,
msi->base + PCIE_MISC_MSI_DATA_CONFIG);
val = msi->legacy ? PCIE_MISC_MSI_DATA_CONFIG_VAL_8 : PCIE_MISC_MSI_DATA_CONFIG_VAL_32;
writel(val, msi->base + PCIE_MISC_MSI_DATA_CONFIG);
}
static int brcm_pcie_enable_msi(struct brcm_pcie *pcie)
@ -634,6 +655,17 @@ static int brcm_pcie_enable_msi(struct brcm_pcie *pcie)
msi->np = pcie->np;
msi->target_addr = pcie->msi_target_addr;
msi->irq = irq;
msi->legacy = pcie->hw_rev < BRCM_PCIE_HW_REV_33;
if (msi->legacy) {
msi->intr_base = msi->base + PCIE_INTR2_CPU_BASE;
msi->nr = BRCM_INT_PCI_MSI_LEGACY_NR;
msi->legacy_shift = 24;
} else {
msi->intr_base = msi->base + PCIE_MSI_INTR2_BASE;
msi->nr = BRCM_INT_PCI_MSI_NR;
msi->legacy_shift = 0;
}
ret = brcm_allocate_domains(msi);
if (ret)
@ -904,12 +936,6 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
tmp &= ~PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK;
writel(tmp, base + PCIE_MISC_RC_BAR3_CONFIG_LO);
/* Mask all interrupts since we are not handling any yet */
writel(0xffffffff, pcie->base + PCIE_MSI_INTR2_MASK_SET);
/* clear any interrupts we find on boot */
writel(0xffffffff, pcie->base + PCIE_MSI_INTR2_CLR);
if (pcie->gen)
brcm_pcie_set_gen(pcie, pcie->gen);
@ -1253,6 +1279,8 @@ static int brcm_pcie_probe(struct platform_device *pdev)
if (ret)
goto fail;
pcie->hw_rev = readl(pcie->base + PCIE_MISC_REVISION);
msi_np = of_parse_phandle(pcie->np, "msi-parent", 0);
if (pci_msi_enabled() && msi_np == pcie->np) {
ret = brcm_pcie_enable_msi(pcie);