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@@ -8,6 +8,7 @@
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* Author: Jingoo Han <jg1.han@samsung.com>
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*/
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+#include <linux/irqchip/chained_irq.h>
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#include <linux/irqdomain.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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@@ -42,22 +43,46 @@ static int dw_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
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return dw_pcie_write(pci->dbi_base + where, size, val);
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}
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-static struct irq_chip dw_msi_irq_chip = {
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+static void dw_msi_ack_irq(struct irq_data *d)
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+{
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+ irq_chip_ack_parent(d);
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+}
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+
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+static void dw_msi_mask_irq(struct irq_data *d)
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+{
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+ pci_msi_mask_irq(d);
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+ irq_chip_mask_parent(d);
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+}
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+
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+static void dw_msi_unmask_irq(struct irq_data *d)
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+{
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+ pci_msi_unmask_irq(d);
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+ irq_chip_unmask_parent(d);
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+}
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+
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+static struct irq_chip dw_pcie_msi_irq_chip = {
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.name = "PCI-MSI",
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- .irq_enable = pci_msi_unmask_irq,
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- .irq_disable = pci_msi_mask_irq,
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- .irq_mask = pci_msi_mask_irq,
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- .irq_unmask = pci_msi_unmask_irq,
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+ .irq_ack = dw_msi_ack_irq,
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+ .irq_mask = dw_msi_mask_irq,
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+ .irq_unmask = dw_msi_unmask_irq,
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+};
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+
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+static struct msi_domain_info dw_pcie_msi_domain_info = {
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+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
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+ MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
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+ .chip = &dw_pcie_msi_irq_chip,
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};
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/* MSI int handler */
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irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
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{
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- u32 val;
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int i, pos, irq;
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+ u32 val, num_ctrls;
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irqreturn_t ret = IRQ_NONE;
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- for (i = 0; i < MAX_MSI_CTRLS; i++) {
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+ num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
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+
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+ for (i = 0; i < num_ctrls; i++) {
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dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12, 4,
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&val);
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if (!val)
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@@ -78,206 +103,216 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
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return ret;
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}
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-void dw_pcie_msi_init(struct pcie_port *pp)
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+/* Chained MSI interrupt service routine */
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+static void dw_chained_msi_isr(struct irq_desc *desc)
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{
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- struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
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- struct device *dev = pci->dev;
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- struct page *page;
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- u64 msi_target;
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+ struct irq_chip *chip = irq_desc_get_chip(desc);
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+ struct pcie_port *pp;
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- page = alloc_page(GFP_KERNEL);
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- pp->msi_data = dma_map_page(dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
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- if (dma_mapping_error(dev, pp->msi_data)) {
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- dev_err(dev, "failed to map MSI data\n");
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- __free_page(page);
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- return;
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- }
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- msi_target = (u64)pp->msi_data;
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+ chained_irq_enter(chip, desc);
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- /* program the msi_data */
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- dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_LO, 4,
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- (u32)(msi_target & 0xffffffff));
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- dw_pcie_wr_own_conf(pp, PCIE_MSI_ADDR_HI, 4,
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- (u32)(msi_target >> 32 & 0xffffffff));
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+ pp = irq_desc_get_handler_data(desc);
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+ dw_handle_msi_irq(pp);
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+
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+ chained_irq_exit(chip, desc);
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}
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-static void dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
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+static void dw_pci_setup_msi_msg(struct irq_data *data, struct msi_msg *msg)
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{
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- unsigned int res, bit, val;
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+ struct pcie_port *pp = irq_data_get_irq_chip_data(data);
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+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
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+ u64 msi_target;
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- res = (irq / 32) * 12;
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- bit = irq % 32;
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- dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
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- val &= ~(1 << bit);
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- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
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-}
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+ if (pp->ops->get_msi_addr)
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+ msi_target = pp->ops->get_msi_addr(pp);
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+ else
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+ msi_target = (u64)pp->msi_data;
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-static void clear_irq_range(struct pcie_port *pp, unsigned int irq_base,
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- unsigned int nvec, unsigned int pos)
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-{
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- unsigned int i;
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-
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- for (i = 0; i < nvec; i++) {
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- irq_set_msi_desc_off(irq_base, i, NULL);
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- /* Disable corresponding interrupt on MSI controller */
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- if (pp->ops->msi_clear_irq)
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- pp->ops->msi_clear_irq(pp, pos + i);
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- else
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- dw_pcie_msi_clear_irq(pp, pos + i);
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- }
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+ msg->address_lo = lower_32_bits(msi_target);
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+ msg->address_hi = upper_32_bits(msi_target);
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- bitmap_release_region(pp->msi_irq_in_use, pos, order_base_2(nvec));
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+ if (pp->ops->get_msi_data)
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+ msg->data = pp->ops->get_msi_data(pp, data->hwirq);
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+ else
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+ msg->data = data->hwirq;
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+
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+ dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n",
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+ (int)data->hwirq, msg->address_hi, msg->address_lo);
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}
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-static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
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+static int dw_pci_msi_set_affinity(struct irq_data *irq_data,
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+ const struct cpumask *mask, bool force)
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{
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- unsigned int res, bit, val;
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-
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- res = (irq / 32) * 12;
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- bit = irq % 32;
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- dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
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- val |= 1 << bit;
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- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
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+ return -EINVAL;
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}
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-static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
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+static void dw_pci_bottom_mask(struct irq_data *data)
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{
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- int irq, pos0, i;
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- struct pcie_port *pp;
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-
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- pp = (struct pcie_port *)msi_desc_to_pci_sysdata(desc);
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- pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
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- order_base_2(no_irqs));
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- if (pos0 < 0)
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- goto no_valid_irq;
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+ struct pcie_port *pp = irq_data_get_irq_chip_data(data);
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+ unsigned int res, bit, ctrl;
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+ unsigned long flags;
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- irq = irq_find_mapping(pp->irq_domain, pos0);
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- if (!irq)
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- goto no_valid_irq;
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+ raw_spin_lock_irqsave(&pp->lock, flags);
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- /*
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- * irq_create_mapping (called from dw_pcie_host_init) pre-allocates
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- * descs so there is no need to allocate descs here. We can therefore
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- * assume that if irq_find_mapping above returns non-zero, then the
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- * descs are also successfully allocated.
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- */
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+ if (pp->ops->msi_clear_irq) {
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+ pp->ops->msi_clear_irq(pp, data->hwirq);
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+ } else {
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+ ctrl = data->hwirq / 32;
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+ res = ctrl * 12;
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+ bit = data->hwirq % 32;
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- for (i = 0; i < no_irqs; i++) {
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- if (irq_set_msi_desc_off(irq, i, desc) != 0) {
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- clear_irq_range(pp, irq, i, pos0);
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- goto no_valid_irq;
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- }
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- /*Enable corresponding interrupt in MSI interrupt controller */
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- if (pp->ops->msi_set_irq)
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- pp->ops->msi_set_irq(pp, pos0 + i);
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- else
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- dw_pcie_msi_set_irq(pp, pos0 + i);
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+ pp->irq_status[ctrl] &= ~(1 << bit);
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+ dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
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+ pp->irq_status[ctrl]);
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}
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- *pos = pos0;
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- desc->nvec_used = no_irqs;
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- desc->msi_attrib.multiple = order_base_2(no_irqs);
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-
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- return irq;
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-
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-no_valid_irq:
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- *pos = pos0;
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- return -ENOSPC;
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+ raw_spin_unlock_irqrestore(&pp->lock, flags);
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}
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-static void dw_msi_setup_msg(struct pcie_port *pp, unsigned int irq, u32 pos)
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+static void dw_pci_bottom_unmask(struct irq_data *data)
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{
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- struct msi_msg msg;
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- u64 msi_target;
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+ struct pcie_port *pp = irq_data_get_irq_chip_data(data);
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+ unsigned int res, bit, ctrl;
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+ unsigned long flags;
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- if (pp->ops->get_msi_addr)
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- msi_target = pp->ops->get_msi_addr(pp);
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- else
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- msi_target = (u64)pp->msi_data;
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+ raw_spin_lock_irqsave(&pp->lock, flags);
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- msg.address_lo = (u32)(msi_target & 0xffffffff);
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- msg.address_hi = (u32)(msi_target >> 32 & 0xffffffff);
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+ if (pp->ops->msi_set_irq) {
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+ pp->ops->msi_set_irq(pp, data->hwirq);
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+ } else {
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+ ctrl = data->hwirq / 32;
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+ res = ctrl * 12;
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+ bit = data->hwirq % 32;
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- if (pp->ops->get_msi_data)
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- msg.data = pp->ops->get_msi_data(pp, pos);
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- else
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- msg.data = pos;
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+ pp->irq_status[ctrl] |= 1 << bit;
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+ dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4,
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+ pp->irq_status[ctrl]);
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+ }
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- pci_write_msi_msg(irq, &msg);
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+ raw_spin_unlock_irqrestore(&pp->lock, flags);
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}
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-static int dw_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
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- struct msi_desc *desc)
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+static void dw_pci_bottom_ack(struct irq_data *d)
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{
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- int irq, pos;
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- struct pcie_port *pp = pdev->bus->sysdata;
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-
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- if (desc->msi_attrib.is_msix)
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- return -EINVAL;
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-
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- irq = assign_irq(1, desc, &pos);
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- if (irq < 0)
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- return irq;
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+ struct msi_desc *msi = irq_data_get_msi_desc(d);
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+ struct pcie_port *pp;
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- dw_msi_setup_msg(pp, irq, pos);
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+ pp = msi_desc_to_pci_sysdata(msi);
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- return 0;
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+ if (pp->ops->msi_irq_ack)
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+ pp->ops->msi_irq_ack(d->hwirq, pp);
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}
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-static int dw_msi_setup_irqs(struct msi_controller *chip, struct pci_dev *pdev,
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- int nvec, int type)
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+static struct irq_chip dw_pci_msi_bottom_irq_chip = {
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+ .name = "DWPCI-MSI",
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+ .irq_ack = dw_pci_bottom_ack,
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+ .irq_compose_msi_msg = dw_pci_setup_msi_msg,
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+ .irq_set_affinity = dw_pci_msi_set_affinity,
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+ .irq_mask = dw_pci_bottom_mask,
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+ .irq_unmask = dw_pci_bottom_unmask,
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+};
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+
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+static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
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+ unsigned int virq, unsigned int nr_irqs,
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+ void *args)
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{
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-#ifdef CONFIG_PCI_MSI
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- int irq, pos;
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- struct msi_desc *desc;
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- struct pcie_port *pp = pdev->bus->sysdata;
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+ struct pcie_port *pp = domain->host_data;
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+ unsigned long flags;
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+ u32 i;
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+ int bit;
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+
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+ raw_spin_lock_irqsave(&pp->lock, flags);
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- /* MSI-X interrupts are not supported */
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- if (type == PCI_CAP_ID_MSIX)
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- return -EINVAL;
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+ bit = bitmap_find_free_region(pp->msi_irq_in_use, pp->num_vectors,
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+ order_base_2(nr_irqs));
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- WARN_ON(!list_is_singular(&pdev->dev.msi_list));
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- desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
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+ raw_spin_unlock_irqrestore(&pp->lock, flags);
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- irq = assign_irq(nvec, desc, &pos);
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- if (irq < 0)
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- return irq;
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+ if (bit < 0)
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+ return -ENOSPC;
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- dw_msi_setup_msg(pp, irq, pos);
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+ for (i = 0; i < nr_irqs; i++)
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+ irq_domain_set_info(domain, virq + i, bit + i,
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+ &dw_pci_msi_bottom_irq_chip,
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+ pp, handle_edge_irq,
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+ NULL, NULL);
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return 0;
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-#else
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- return -EINVAL;
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-#endif
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}
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-static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
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+static void dw_pcie_irq_domain_free(struct irq_domain *domain,
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+ unsigned int virq, unsigned int nr_irqs)
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{
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- struct irq_data *data = irq_get_irq_data(irq);
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- struct msi_desc *msi = irq_data_get_msi_desc(data);
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- struct pcie_port *pp = (struct pcie_port *)msi_desc_to_pci_sysdata(msi);
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-
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- clear_irq_range(pp, irq, 1, data->hwirq);
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+ struct irq_data *data = irq_domain_get_irq_data(domain, virq);
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+ struct pcie_port *pp = irq_data_get_irq_chip_data(data);
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+ unsigned long flags;
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+
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+ raw_spin_lock_irqsave(&pp->lock, flags);
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+ bitmap_release_region(pp->msi_irq_in_use, data->hwirq,
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+ order_base_2(nr_irqs));
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+ raw_spin_unlock_irqrestore(&pp->lock, flags);
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}
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-static struct msi_controller dw_pcie_msi_chip = {
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- .setup_irq = dw_msi_setup_irq,
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- .setup_irqs = dw_msi_setup_irqs,
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- .teardown_irq = dw_msi_teardown_irq,
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+static const struct irq_domain_ops dw_pcie_msi_domain_ops = {
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+ .alloc = dw_pcie_irq_domain_alloc,
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+ .free = dw_pcie_irq_domain_free,
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};
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-static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
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- irq_hw_number_t hwirq)
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+int dw_pcie_allocate_domains(struct pcie_port *pp)
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{
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- irq_set_chip_and_handler(irq, &dw_msi_irq_chip, handle_simple_irq);
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- irq_set_chip_data(irq, domain->host_data);
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+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
|
|
|
+ struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
|
|
|
+
|
|
|
+ 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");
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
+
|
|
|
+ pp->msi_domain = pci_msi_create_irq_domain(fwnode,
|
|
|
+ &dw_pcie_msi_domain_info,
|
|
|
+ pp->irq_domain);
|
|
|
+ if (!pp->msi_domain) {
|
|
|
+ dev_err(pci->dev, "failed to create MSI domain\n");
|
|
|
+ irq_domain_remove(pp->irq_domain);
|
|
|
+ return -ENOMEM;
|
|
|
+ }
|
|
|
|
|
|
return 0;
|
|
|
}
|
|
|
|
|
|
-static const struct irq_domain_ops msi_domain_ops = {
|
|
|
- .map = dw_pcie_msi_map,
|
|
|
-};
|
|
|
+void dw_pcie_free_msi(struct pcie_port *pp)
|
|
|
+{
|
|
|
+ irq_set_chained_handler(pp->msi_irq, NULL);
|
|
|
+ irq_set_handler_data(pp->msi_irq, NULL);
|
|
|
+
|
|
|
+ irq_domain_remove(pp->msi_domain);
|
|
|
+ irq_domain_remove(pp->irq_domain);
|
|
|
+}
|
|
|
+
|
|
|
+void dw_pcie_msi_init(struct pcie_port *pp)
|
|
|
+{
|
|
|
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
|
|
|
+ struct device *dev = pci->dev;
|
|
|
+ struct page *page;
|
|
|
+ u64 msi_target;
|
|
|
+
|
|
|
+ page = alloc_page(GFP_KERNEL);
|
|
|
+ pp->msi_data = dma_map_page(dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
|
|
|
+ if (dma_mapping_error(dev, pp->msi_data)) {
|
|
|
+ dev_err(dev, "failed to map MSI data\n");
|
|
|
+ __free_page(page);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ 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));
|
|
|
+}
|
|
|
|
|
|
int dw_pcie_host_init(struct pcie_port *pp)
|
|
|
{
|
|
@@ -285,11 +320,13 @@ int dw_pcie_host_init(struct pcie_port *pp)
|
|
|
struct device *dev = pci->dev;
|
|
|
struct device_node *np = dev->of_node;
|
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
|
+ struct resource_entry *win, *tmp;
|
|
|
struct pci_bus *bus, *child;
|
|
|
struct pci_host_bridge *bridge;
|
|
|
struct resource *cfg_res;
|
|
|
- int i, ret;
|
|
|
- struct resource_entry *win, *tmp;
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ raw_spin_lock_init(&pci->pp.lock);
|
|
|
|
|
|
cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
|
|
|
if (cfg_res) {
|
|
@@ -388,20 +425,35 @@ int dw_pcie_host_init(struct pcie_port *pp)
|
|
|
pci->num_viewport = 2;
|
|
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI)) {
|
|
|
- if (!pp->ops->msi_host_init) {
|
|
|
- pp->irq_domain = irq_domain_add_linear(dev->of_node,
|
|
|
- MAX_MSI_IRQS, &msi_domain_ops,
|
|
|
- &dw_pcie_msi_chip);
|
|
|
- if (!pp->irq_domain) {
|
|
|
- dev_err(dev, "irq domain init failed\n");
|
|
|
- ret = -ENXIO;
|
|
|
+ /*
|
|
|
+ * If a specific SoC driver needs to change the
|
|
|
+ * default number of vectors, it needs to implement
|
|
|
+ * the set_num_vectors callback.
|
|
|
+ */
|
|
|
+ if (!pp->ops->set_num_vectors) {
|
|
|
+ pp->num_vectors = MSI_DEF_NUM_VECTORS;
|
|
|
+ } else {
|
|
|
+ pp->ops->set_num_vectors(pp);
|
|
|
+
|
|
|
+ if (pp->num_vectors > MAX_MSI_IRQS ||
|
|
|
+ pp->num_vectors == 0) {
|
|
|
+ dev_err(dev,
|
|
|
+ "Invalid number of vectors\n");
|
|
|
goto error;
|
|
|
}
|
|
|
+ }
|
|
|
|
|
|
- for (i = 0; i < MAX_MSI_IRQS; i++)
|
|
|
- irq_create_mapping(pp->irq_domain, i);
|
|
|
+ if (!pp->ops->msi_host_init) {
|
|
|
+ ret = dw_pcie_allocate_domains(pp);
|
|
|
+ if (ret)
|
|
|
+ goto error;
|
|
|
+
|
|
|
+ if (pp->msi_irq)
|
|
|
+ irq_set_chained_handler_and_data(pp->msi_irq,
|
|
|
+ dw_chained_msi_isr,
|
|
|
+ pp);
|
|
|
} else {
|
|
|
- ret = pp->ops->msi_host_init(pp, &dw_pcie_msi_chip);
|
|
|
+ ret = pp->ops->msi_host_init(pp);
|
|
|
if (ret < 0)
|
|
|
goto error;
|
|
|
}
|
|
@@ -421,10 +473,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
|
|
|
bridge->ops = &dw_pcie_ops;
|
|
|
bridge->map_irq = of_irq_parse_and_map_pci;
|
|
|
bridge->swizzle_irq = pci_common_swizzle;
|
|
|
- if (IS_ENABLED(CONFIG_PCI_MSI)) {
|
|
|
- bridge->msi = &dw_pcie_msi_chip;
|
|
|
- dw_pcie_msi_chip.dev = dev;
|
|
|
- }
|
|
|
|
|
|
ret = pci_scan_root_bus_bridge(bridge);
|
|
|
if (ret)
|
|
@@ -593,11 +641,17 @@ static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
|
|
|
|
|
|
void dw_pcie_setup_rc(struct pcie_port *pp)
|
|
|
{
|
|
|
- u32 val;
|
|
|
+ u32 val, ctrl, num_ctrls;
|
|
|
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
|
|
|
|
|
|
dw_pcie_setup(pci);
|
|
|
|
|
|
+ num_ctrls = pp->num_vectors / MAX_MSI_IRQS_PER_CTRL;
|
|
|
+
|
|
|
+ /* 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_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0x00000004);
|
|
|
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
|