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Diffstat (limited to 'arch/mips/pci/pci-ar724x.c')
-rw-r--r--arch/mips/pci/pci-ar724x.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/arch/mips/pci/pci-ar724x.c b/arch/mips/pci/pci-ar724x.c
index 1e23c8d587bd..64b58cc48a91 100644
--- a/arch/mips/pci/pci-ar724x.c
+++ b/arch/mips/pci/pci-ar724x.c
@@ -12,14 +12,18 @@
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/init.h>
+#include <linux/delay.h>
#include <linux/platform_device.h>
#include <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>
+#define AR724X_PCI_REG_APP 0x00
#define AR724X_PCI_REG_RESET 0x18
#define AR724X_PCI_REG_INT_STATUS 0x4c
#define AR724X_PCI_REG_INT_MASK 0x50
+#define AR724X_PCI_APP_LTSSM_ENABLE BIT(0)
+
#define AR724X_PCI_RESET_LINK_UP BIT(0)
#define AR724X_PCI_INT_DEV0 BIT(14)
@@ -325,6 +329,37 @@ static void ar724x_pci_irq_init(struct ar724x_pci_controller *apc,
apc);
}
+static void ar724x_pci_hw_init(struct ar724x_pci_controller *apc)
+{
+ u32 ppl, app;
+ int wait = 0;
+
+ /* deassert PCIe host controller and PCIe PHY reset */
+ ath79_device_reset_clear(AR724X_RESET_PCIE);
+ ath79_device_reset_clear(AR724X_RESET_PCIE_PHY);
+
+ /* remove the reset of the PCIE PLL */
+ ppl = ath79_pll_rr(AR724X_PLL_REG_PCIE_CONFIG);
+ ppl &= ~AR724X_PLL_REG_PCIE_CONFIG_PPL_RESET;
+ ath79_pll_wr(AR724X_PLL_REG_PCIE_CONFIG, ppl);
+
+ /* deassert bypass for the PCIE PLL */
+ ppl = ath79_pll_rr(AR724X_PLL_REG_PCIE_CONFIG);
+ ppl &= ~AR724X_PLL_REG_PCIE_CONFIG_PPL_BYPASS;
+ ath79_pll_wr(AR724X_PLL_REG_PCIE_CONFIG, ppl);
+
+ /* set PCIE Application Control to ready */
+ app = __raw_readl(apc->ctrl_base + AR724X_PCI_REG_APP);
+ app |= AR724X_PCI_APP_LTSSM_ENABLE;
+ __raw_writel(app, apc->ctrl_base + AR724X_PCI_REG_APP);
+
+ /* wait up to 100ms for PHY link up */
+ do {
+ mdelay(10);
+ wait++;
+ } while (wait < 10 && !ar724x_pci_check_link(apc));
+}
+
static int ar724x_pci_probe(struct platform_device *pdev)
{
struct ar724x_pci_controller *apc;
@@ -383,6 +418,13 @@ static int ar724x_pci_probe(struct platform_device *pdev)
apc->pci_controller.io_resource = &apc->io_res;
apc->pci_controller.mem_resource = &apc->mem_res;
+ /*
+ * Do the full PCIE Root Complex Initialization Sequence if the PCIe
+ * host controller is in reset.
+ */
+ if (ath79_reset_rr(AR724X_RESET_REG_RESET_MODULE) & AR724X_RESET_PCIE)
+ ar724x_pci_hw_init(apc);
+
apc->link_up = ar724x_pci_check_link(apc);
if (!apc->link_up)
dev_warn(&pdev->dev, "PCIe link is down\n");