[PATCH v2 02/40] PCI: dwc: Use DBI accessors instead of own config accessors

Rob Herring
2020-08-21T03:54:47Z

The Designware DBI space contains the root bus bridge config space.
Platforms needing custom {rd,wr}_own_conf functions are also the ones
needing custom {read,write}_dbi ops functions and the access sequences
are the same.

Replace all dw_pcie_{rd,wr}_own_conf() calls with the DBI variants in
preparation to remove dw_pcie_{rd,wr}_own_conf().

Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rob Herring <robh@kernel.org>
---
.../pci/controller/dwc/pcie-designware-host.c | 55 +++++++------------
1 file changed, 19 insertions(+), 36 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 9dafecba347f..1d98554db009 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -82,13 +82,13 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
unsigned long val;
u32 status, num_ctrls;
irqreturn_t ret = IRQ_NONE;
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);

num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;

for (i = 0; i < num_ctrls; i++) {
- dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
- (i * MSI_REG_CTRL_BLOCK_SIZE),
- 4, &status);
+ status = dw_pcie_readl_dbi(pci, PCIE_MSI_INTR0_STATUS +
+ (i * MSI_REG_CTRL_BLOCK_SIZE));
if (!status)
continue;

@@ -148,6 +148,7 @@ static int dw_pci_msi_set_affinity(struct irq_data *d,
static void dw_pci_bottom_mask(struct irq_data *d)
{
struct pcie_port *pp = irq_data_get_irq_chip_data(d);
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
unsigned int res, bit, ctrl;
unsigned long flags;

@@ -158,8 +159,7 @@ static void dw_pci_bottom_mask(struct irq_data *d)
bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;

pp->irq_mask[ctrl] |= BIT(bit);
- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + res, 4,
- pp->irq_mask[ctrl]);
+ dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);

raw_spin_unlock_irqrestore(&pp->lock, flags);
}
@@ -167,6 +167,7 @@ static void dw_pci_bottom_mask(struct irq_data *d)
static void dw_pci_bottom_unmask(struct irq_data *d)
{
struct pcie_port *pp = irq_data_get_irq_chip_data(d);
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
unsigned int res, bit, ctrl;
unsigned long flags;

@@ -177,8 +178,7 @@ static void dw_pci_bottom_unmask(struct irq_data *d)
bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;

pp->irq_mask[ctrl] &= ~BIT(bit);
- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK + res, 4,
- pp->irq_mask[ctrl]);
+ dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK + res, pp->irq_mask[ctrl]);

raw_spin_unlock_irqrestore(&pp->lock, flags);
}
@@ -186,13 +186,14 @@ static void dw_pci_bottom_unmask(struct irq_data *d)
static void dw_pci_bottom_ack(struct irq_data *d)
{
struct pcie_port *pp = irq_data_get_irq_chip_data(d);
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
unsigned int res, bit, ctrl;

ctrl = d->hwirq / MAX_MSI_IRQS_PER_CTRL;
res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
bit = d->hwirq % MAX_MSI_IRQS_PER_CTRL;

- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS + res, 4, BIT(bit));
+ dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_STATUS + res, BIT(bit));
}

static struct irq_chip dw_pci_msi_bottom_irq_chip = {
@@ -310,10 +311,8 @@ void dw_pcie_msi_init(struct pcie_port *pp)
msi_target = (u64)pp->msi_data;

/* Program the msi_data */
- dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
- lower_32_bits(msi_target));
- dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
- upper_32_bits(msi_target));
+ dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_LO, lower_32_bits(msi_target));
+ dw_pcie_writel_dbi(pci, PCIE_MSI_ADDR_HI, upper_32_bits(msi_target));
}
EXPORT_SYMBOL_GPL(dw_pcie_msi_init);

@@ -327,7 +326,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
struct pci_bus *child;
struct pci_host_bridge *bridge;
struct resource *cfg_res;
- u32 hdr_type;
int ret;

raw_spin_lock_init(&pci->pp.lock);
@@ -453,21 +451,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
goto err_free_msi;
}

- ret = dw_pcie_rd_own_conf(pp, PCI_HEADER_TYPE, 1, &hdr_type);
- if (ret != PCIBIOS_SUCCESSFUL) {
- dev_err(pci->dev, "Failed reading PCI_HEADER_TYPE cfg space reg (ret: 0x%x)\n",
- ret);
- ret = pcibios_err_to_errno(ret);
- goto err_free_msi;
- }
- if (hdr_type != PCI_HEADER_TYPE_BRIDGE) {
- dev_err(pci->dev,
- "PCIe controller is not set to bridge type (hdr_type: 0x%x)!\n",
- hdr_type);
- ret = -EIO;
- goto err_free_msi;
- }
-
bridge->sysdata = pp;
bridge->ops = &dw_pcie_ops;

@@ -638,12 +621,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
/* Initialize IRQ Status array */
for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
pp->irq_mask[ctrl] = ~0;
- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_MASK +
+ dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_MASK +
(ctrl * MSI_REG_CTRL_BLOCK_SIZE),
- 4, pp->irq_mask[ctrl]);
- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
+ pp->irq_mask[ctrl]);
+ dw_pcie_writel_dbi(pci, PCIE_MSI_INTR0_ENABLE +
(ctrl * MSI_REG_CTRL_BLOCK_SIZE),
- 4, ~0);
+ ~0);
}
}

@@ -685,14 +668,14 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
pp->io_bus_addr, pp->io_size);
}

- dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
+ dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0);

/* Program correct class for RC */
- dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
+ dw_pcie_writew_dbi(pci, PCI_CLASS_DEVICE, PCI_CLASS_BRIDGE_PCI);

- dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
+ val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
val |= PORT_LOGIC_SPEED_CHANGE;
- dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
+ dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);

dw_pcie_dbi_ro_wr_dis(pci);
}
--
2.25.1