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Subject[PATCH v4 10/10] PCI: dwc: Replace magic number by defines
Date
Replace magic numbers by a well known define in order to make the code
human readable and also facilitate the code reusability.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Jingoo Han <jingoohan1@gmail.com>
---
Change v1->v2:
- Nothing changed, just to follow the patch set version.
Change v2->v3:
- Nothing changed, just to follow the patch set version.
Changes v3->v4:
- Nothing changed, just to follow the patch set version.

drivers/pci/dwc/pcie-designware-host.c | 34 ++++++++++++++++++++--------------
drivers/pci/dwc/pcie-designware.h | 1 +
2 files changed, 21 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c
index fc55fde..a7657ab 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,
@@ -652,8 +657,9 @@ 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]);
+ 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);
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

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