[PATCHv3 2/3] ARMv8: layerscape: add the pcie ep function support

Bao Xiaowei
2017-11-10T02:49:25Z

Add the pcie controller ep function support of layerscape base on
pcie ep framework.

Signed-off-by: Bao Xiaowei <xiaowei.bao@nxp.com>
---
v2:
- fix the ioremap function used but no ioumap issue
- optimize the code structure
- add code comments
v3:
- fix the msi outband window request failed issue

drivers/pci/dwc/pci-layerscape.c | 124 +++++++++++++++++++++++++++++++++++++--
1 file changed, 118 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/dwc/pci-layerscape.c b/drivers/pci/dwc/pci-layerscape.c
index 87fa486bee2c..d787375528eb 100644
--- a/drivers/pci/dwc/pci-layerscape.c
+++ b/drivers/pci/dwc/pci-layerscape.c
@@ -34,7 +34,12 @@
/* PEX Internal Configuration Registers */
#define PCIE_STRFMR1 0x71c /* Symbol Timer & Filter Mask Register1 */

+#define PCIE_DBI2_BASE 0x1000 /* DBI2 base address*/
+#define PCIE_MSI_MSG_DATA_OFF 0x5c /* MSI Data register address*/
+#define PCIE_MSI_OB_SIZE 4096
+#define PCIE_MSI_ADDR_OFFSET (1024 * 1024)
#define PCIE_IATU_NUM 6
+#define PCIE_EP_ADDR_SPACE_SIZE 0x100000000

struct ls_pcie_drvdata {
u32 lut_offset;
@@ -44,12 +49,20 @@ struct ls_pcie_drvdata {
const struct dw_pcie_ops *dw_pcie_ops;
};

+struct ls_pcie_ep {
+ dma_addr_t msi_phys_addr;
+ void __iomem *msi_virt_addr;
+ u64 msi_msg_addr;
+ u16 msi_msg_data;
+};
+
struct ls_pcie {
struct dw_pcie *pci;
void __iomem *lut;
struct regmap *scfg;
const struct ls_pcie_drvdata *drvdata;
int index;
+ struct ls_pcie_ep *pcie_ep;
};

#define to_ls_pcie(x) dev_get_drvdata((x)->dev)
@@ -263,6 +276,100 @@ static const struct of_device_id ls_pcie_of_match[] = {
{ },
};

+static void ls_pcie_raise_msi_irq(struct ls_pcie_ep *pcie_ep)
+{
+ iowrite32(pcie_ep->msi_msg_data, pcie_ep->msi_virt_addr);
+}
+
+static int ls_pcie_raise_irq(struct dw_pcie_ep *ep,
+ enum pci_epc_irq_type type, u8 interrupt_num)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+ struct ls_pcie *pcie = to_ls_pcie(pci);
+ struct ls_pcie_ep *pcie_ep = pcie->pcie_ep;
+ u32 free_win;
+
+ /* get the msi message address and msi message data */
+ pcie_ep->msi_msg_addr = ioread32(pci->dbi_base + MSI_MESSAGE_ADDR_L32) |
+ (((u64)ioread32(pci->dbi_base + MSI_MESSAGE_ADDR_U32)) << 32);
+ pcie_ep->msi_msg_data = ioread16(pci->dbi_base + PCIE_MSI_MSG_DATA_OFF);
+
+ /* request and config the outband window for msi */
+ free_win = find_first_zero_bit(&ep->ob_window_map,
+ sizeof(ep->ob_window_map));
+ if (free_win >= ep->num_ob_windows) {
+ dev_err(pci->dev, "no free outbound window\n");
+ return -ENOMEM;
+ }
+
+ dw_pcie_prog_outbound_atu(pci, free_win, PCIE_ATU_TYPE_MEM,
+ pcie_ep->msi_phys_addr,
+ pcie_ep->msi_msg_addr,
+ PCIE_MSI_OB_SIZE);
+
+ set_bit(free_win, &ep->ob_window_map);
+
+ /* generate the msi interrupt */
+ ls_pcie_raise_msi_irq(pcie_ep);
+
+ /* release the outband window of msi */
+ dw_pcie_disable_atu(pci, free_win, DW_PCIE_REGION_OUTBOUND);
+ clear_bit(free_win, &ep->ob_window_map);
+
+ return 0;
+}
+
+static struct dw_pcie_ep_ops pcie_ep_ops = {
+ .raise_irq = ls_pcie_raise_irq,
+};
+
+static int __init ls_add_pcie_ep(struct ls_pcie *pcie,
+ struct platform_device *pdev)
+{
+ struct dw_pcie *pci = pcie->pci;
+ struct device *dev = pci->dev;
+ struct dw_pcie_ep *ep;
+ struct ls_pcie_ep *pcie_ep;
+ struct resource *cfg_res;
+ int ret;
+
+ ep = &pci->ep;
+ ep->ops = &pcie_ep_ops;
+
+ pcie_ep = devm_kzalloc(dev, sizeof(*pcie_ep), GFP_KERNEL);
+ if (!pcie_ep)
+ return -ENOMEM;
+
+ pcie->pcie_ep = pcie_ep;
+
+ cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
+ if (cfg_res) {
+ ep->phys_base = cfg_res->start;
+ ep->addr_size = PCIE_EP_ADDR_SPACE_SIZE;
+ } else {
+ dev_err(dev, "missing *config* space\n");
+ return -ENODEV;
+ }
+
+ pcie_ep->msi_phys_addr = ep->phys_base + PCIE_MSI_ADDR_OFFSET;
+
+ pcie_ep->msi_virt_addr = ioremap(pcie_ep->msi_phys_addr,
+ PCIE_MSI_OB_SIZE);
+ if (!pcie_ep->msi_virt_addr) {
+ dev_err(dev, "failed to map MSI outbound region\n");
+ return -ENOMEM;
+ }
+
+ ret = dw_pcie_ep_init(ep);
+ if (ret) {
+ dev_err(dev, "failed to initialize endpoint\n");
+ return ret;
+ }
+
+ return 0;
+
+}
+
static int __init ls_add_pcie_port(struct ls_pcie *pcie)
{
struct dw_pcie *pci = pcie->pci;
@@ -309,16 +416,21 @@ static int __init ls_pcie_probe(struct platform_device *pdev)
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);

- pcie->lut = pci->dbi_base + pcie->drvdata->lut_offset;
+ pci->dbi_base2 = pci->dbi_base + PCIE_DBI2_BASE;

- if (!ls_pcie_is_bridge(pcie))
- return -ENODEV;
+ pcie->lut = pci->dbi_base + pcie->drvdata->lut_offset;

platform_set_drvdata(pdev, pcie);

- ret = ls_add_pcie_port(pcie);
- if (ret < 0)
- return ret;
+ if (!ls_pcie_is_bridge(pcie)) {
+ ret = ls_add_pcie_ep(pcie, pdev);
+ if (ret < 0)
+ return ret;
+ } else {
+ ret = ls_add_pcie_port(pcie);
+ if (ret < 0)
+ return ret;
+ }

return 0;
}
--
2.14.1