Replace magic numbers by a well known define in order to make the code
human readable and also facilitate the code reusability.
Add a callback to define the number of vectors as an example.
Exchange lower case into upper case in comments and debug printks.
Signed-off-by: Gustavo Pimentel <gustavo.pimentel@xxxxxxxxxxxx>
---
drivers/pci/dwc/pcie-designware-host.c | 74 +++++++++++++++++++---------------
drivers/pci/dwc/pcie-designware-plat.c | 6 +++
drivers/pci/dwc/pcie-designware.h | 1 +
3 files changed, 48 insertions(+), 33 deletions(-)
diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index 550fdbb..0a3db2e 100644
--- a/drivers/pci/dwc/pcie-designware-host.c
+++ b/drivers/pci/dwc/pcie-designware-host.c
@@ -83,18 +83,23 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *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 * 12, 4,
- &val);
+ dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS +
+ (i * MSI_REG_CTRL_BLOCK_SIZE),
+ 4, &val);
if (!val)
continue;
ret = IRQ_HANDLED;
pos = 0;
- while ((pos = find_next_bit((unsigned long *) &val, 32,
- pos)) != 32) {
- irq = irq_find_mapping(pp->irq_domain, i * 32 + pos);
+ while ((pos = find_next_bit((unsigned long *) &val,
+ MAX_MSI_IRQS_PER_CTRL,
+ pos)) != MAX_MSI_IRQS_PER_CTRL) {
+ irq = irq_find_mapping(pp->irq_domain,
+ (i * MAX_MSI_IRQS_PER_CTRL) +
+ pos);
generic_handle_irq(irq);
- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12,
+ dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS +
+ (i * MSI_REG_CTRL_BLOCK_SIZE),
4, 1 << pos);
pos++;
}
@@ -157,9 +162,9 @@ static void dw_pci_bottom_mask(struct irq_data *data)
if (pp->ops->msi_clear_irq) {
pp->ops->msi_clear_irq(pp, data->hwirq);
} else {
- ctrl = data->hwirq / 32;
- res = ctrl * 12;
- bit = data->hwirq % 32;
+ ctrl = data->hwirq / MAX_MSI_IRQS_PER_CTRL;
+ res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
+ bit = data->hwirq % MAX_MSI_IRQS_PER_CTRL;
pp->irq_status[ctrl] &= ~(1 << bit);
dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
@@ -180,9 +185,9 @@ static void dw_pci_bottom_unmask(struct irq_data *data)
if (pp->ops->msi_set_irq) {
pp->ops->msi_set_irq(pp, data->hwirq);
} else {
- ctrl = data->hwirq / 32;
- res = ctrl * 12;
- bit = data->hwirq % 32;
+ ctrl = data->hwirq / MAX_MSI_IRQS_PER_CTRL;
+ res = ctrl * MSI_REG_CTRL_BLOCK_SIZE;
+ bit = data->hwirq % MAX_MSI_IRQS_PER_CTRL;
pp->irq_status[ctrl] |= 1 << bit;
dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
@@ -248,8 +253,10 @@ static void dw_pcie_irq_domain_free(struct irq_domain *domain,
unsigned long flags;
raw_spin_lock_irqsave(&pp->lock, flags);
+
bitmap_release_region(pp->msi_irq_in_use, data->hwirq,
order_base_2(nr_irqs));
+
raw_spin_unlock_irqrestore(&pp->lock, flags);
}
@@ -266,7 +273,7 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
&dw_pcie_msi_domain_ops, pp);
if (!pp->irq_domain) {
- dev_err(pci->dev, "failed to create IRQ domain\n");
+ dev_err(pci->dev, "Failed to create IRQ domain\n");
return -ENOMEM;
}
@@ -274,7 +281,7 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
&dw_pcie_msi_domain_info,
pp->irq_domain);
if (!pp->msi_domain) {
- dev_err(pci->dev, "failed to create MSI domain\n");
+ dev_err(pci->dev, "Failed to create MSI domain\n");
irq_domain_remove(pp->irq_domain);
return -ENOMEM;
}
@@ -307,7 +314,7 @@ void dw_pcie_msi_init(struct pcie_port *pp)
}
msi_target = (u64)pp->msi_data;
- /* program the 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,
@@ -330,12 +337,12 @@ int dw_pcie_host_init(struct pcie_port *pp)
cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
if (cfg_res) {
- pp->cfg0_size = resource_size(cfg_res) / 2;
- pp->cfg1_size = resource_size(cfg_res) / 2;
+ pp->cfg0_size = resource_size(cfg_res) >> 1;
+ pp->cfg1_size = resource_size(cfg_res) >> 1;
pp->cfg0_base = cfg_res->start;
pp->cfg1_base = cfg_res->start + pp->cfg0_size;
} else if (!pp->va_cfg0_base) {
- dev_err(dev, "missing *config* reg space\n");
+ dev_err(dev, "Missing *config* reg space\n");
}
bridge = pci_alloc_host_bridge(0);
@@ -357,7 +364,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
case IORESOURCE_IO:
ret = pci_remap_iospace(win->res, pp->io_base);
if (ret) {
- dev_warn(dev, "error %d: failed to map resource %pR\n",
+ dev_warn(dev, "Error %d: failed to map resource %pR\n",
ret, win->res);
resource_list_destroy_entry(win);
} else {
@@ -375,8 +382,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
break;
case 0:
pp->cfg = win->res;
- pp->cfg0_size = resource_size(pp->cfg) / 2;
- pp->cfg1_size = resource_size(pp->cfg) / 2;
+ pp->cfg0_size = resource_size(pp->cfg) >> 1;
+ pp->cfg1_size = resource_size(pp->cfg) >> 1;
pp->cfg0_base = pp->cfg->start;
pp->cfg1_base = pp->cfg->start + pp->cfg0_size;
break;
@@ -391,7 +398,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
pp->cfg->start,
resource_size(pp->cfg));
if (!pci->dbi_base) {
- dev_err(dev, "error with ioremap\n");
+ dev_err(dev, "Error with ioremap\n");
ret = -ENOMEM;
goto error;
}
@@ -403,7 +410,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
pp->va_cfg0_base = devm_pci_remap_cfgspace(dev,
pp->cfg0_base, pp->cfg0_size);
if (!pp->va_cfg0_base) {
- dev_err(dev, "error with ioremap in function\n");
+ dev_err(dev, "Error with ioremap in function\n");
ret = -ENOMEM;
goto error;
}
@@ -414,7 +421,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
pp->cfg1_base,
pp->cfg1_size);
if (!pp->va_cfg1_base) {
- dev_err(dev, "error with ioremap\n");
+ dev_err(dev, "Error with ioremap\n");
ret = -ENOMEM;
goto error;
}
@@ -586,7 +593,7 @@ static int dw_pcie_valid_device(struct pcie_port *pp, struct pci_bus *bus,
return 0;
}
- /* access only one slot on each root port */
+ /* Access only one slot on each root port */
if (bus->number == pp->root_bus_nr && dev > 0)
return 0;
@@ -650,13 +657,14 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
/* Initialize IRQ Status array */
for (ctrl = 0; ctrl < num_ctrls; ctrl++)
- dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + (ctrl * 12), 4,
- &pp->irq_status[ctrl]);
- /* setup RC BARs */
+ dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE +
+ (ctrl * MSI_REG_CTRL_BLOCK_SIZE),
+ 4, &pp->irq_status[ctrl]);
+ /* Setup RC BARs */
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
- /* setup interrupt pins */
+ /* Setup interrupt pins */
dw_pcie_dbi_ro_wr_en(pci);
val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
val &= 0xffff00ff;
@@ -664,13 +672,13 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
dw_pcie_dbi_ro_wr_dis(pci);
- /* setup bus numbers */
+ /* Setup bus numbers */
val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
val &= 0xff000000;
val |= 0x00010100;
dw_pcie_writel_dbi(pci, PCI_PRIMARY_BUS, val);
- /* setup command register */
+ /* Setup command register */
val = dw_pcie_readl_dbi(pci, PCI_COMMAND);
val &= 0xffff0000;
val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
@@ -683,7 +691,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
* we should not program the ATU here.
*/
if (!pp->ops->rd_other_conf) {
- /* get iATU unroll support */
+ /* Get iATU unroll support */
pci->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pci);
dev_dbg(pci->dev, "iATU unroll: %s\n",
pci->iatu_unroll_enabled ? "enabled" : "disabled");
@@ -701,7 +709,7 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
/* Enable write permission for the DBI read-only register */
dw_pcie_dbi_ro_wr_en(pci);
- /* program correct class for RC */
+ /* Program correct class for RC */
dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
/* Better disable write permission right after the update */
dw_pcie_dbi_ro_wr_dis(pci);
diff --git a/drivers/pci/dwc/pcie-designware-plat.c b/drivers/pci/dwc/pcie-designware-plat.c
index 5416aa8..83e316e 100644
--- a/drivers/pci/dwc/pcie-designware-plat.c
+++ b/drivers/pci/dwc/pcie-designware-plat.c
@@ -38,8 +38,14 @@ static int dw_plat_pcie_host_init(struct pcie_port *pp)
return 0;
}
+static void dw_plat_set_num_vectors(struct pcie_port *pp)
+{
+ pp->num_vectors = MSI_DEF_NUM_VECTORS;
+}
+
static const struct dw_pcie_host_ops dw_plat_pcie_host_ops = {
.host_init = dw_plat_pcie_host_init,
+ .set_num_vectors = dw_plat_set_num_vectors,
};
static int dw_plat_add_pcie_port(struct pcie_port *pp,
diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h
index fe811db..bee4e25 100644
--- a/drivers/pci/dwc/pcie-designware.h
+++ b/drivers/pci/dwc/pcie-designware.h
@@ -110,6 +110,7 @@
#define MAX_MSI_IRQS 256
#define MAX_MSI_IRQS_PER_CTRL 32
#define MAX_MSI_CTRLS (MAX_MSI_IRQS / MAX_MSI_IRQS_PER_CTRL)
+#define MSI_REG_CTRL_BLOCK_SIZE 12
#define MSI_DEF_NUM_VECTORS 32
/* Maximum number of inbound/outbound iATUs */
--
2.7.4
