usb: host: xhci-tegra: Selectively program IPFS

Starting with Tegra186, the XUSB controller no longer has the IPFS
wrapper. This commit adds a "has_ipfs" field to struct tegra_xusb_soc
that can be used to declare the existence of the IPFS wrapper.

For the existing chips (i.e. Tegra124 and Tegra210), the new field is
set to true. A future patch adding support for Tegra186 will set it to
false.

Signed-off-by: JC Kuo <jckuo@nvidia.com>
Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index efb0cad..4d133bb 100644 (file)
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -161,6 +161,7 @@ struct tegra_xusb_soc {
        } ports;
 
        bool scale_ss_clock;
+       bool has_ipfs;
 };
 
 struct tegra_xusb {
@@ -637,16 +638,18 @@ static irqreturn_t tegra_xusb_mbox_thread(int irq, void *data)
        return IRQ_HANDLED;
 }
 
-static void tegra_xusb_ipfs_config(struct tegra_xusb *tegra,
-                                  struct resource *regs)
+static void tegra_xusb_config(struct tegra_xusb *tegra,
+                             struct resource *regs)
 {
        u32 value;
 
-       value = ipfs_readl(tegra, IPFS_XUSB_HOST_CONFIGURATION_0);
-       value |= IPFS_EN_FPCI;
-       ipfs_writel(tegra, value, IPFS_XUSB_HOST_CONFIGURATION_0);
+       if (tegra->soc->has_ipfs) {
+               value = ipfs_readl(tegra, IPFS_XUSB_HOST_CONFIGURATION_0);
+               value |= IPFS_EN_FPCI;
+               ipfs_writel(tegra, value, IPFS_XUSB_HOST_CONFIGURATION_0);
 
-       usleep_range(10, 20);
+               usleep_range(10, 20);
+       }
 
        /* Program BAR0 space */
        value = fpci_readl(tegra, XUSB_CFG_4);
@@ -661,13 +664,15 @@ static void tegra_xusb_ipfs_config(struct tegra_xusb *tegra,
        value |= XUSB_IO_SPACE_EN | XUSB_MEM_SPACE_EN | XUSB_BUS_MASTER_EN;
        fpci_writel(tegra, value, XUSB_CFG_1);
 
-       /* Enable interrupt assertion */
-       value = ipfs_readl(tegra, IPFS_XUSB_HOST_INTR_MASK_0);
-       value |= IPFS_IP_INT_MASK;
-       ipfs_writel(tegra, value, IPFS_XUSB_HOST_INTR_MASK_0);
+       if (tegra->soc->has_ipfs) {
+               /* Enable interrupt assertion */
+               value = ipfs_readl(tegra, IPFS_XUSB_HOST_INTR_MASK_0);
+               value |= IPFS_IP_INT_MASK;
+               ipfs_writel(tegra, value, IPFS_XUSB_HOST_INTR_MASK_0);
 
-       /* Set hysteresis */
-       ipfs_writel(tegra, 0x80, IPFS_XUSB_HOST_CLKGATE_HYSTERESIS_0);
+               /* Set hysteresis */
+               ipfs_writel(tegra, 0x80, IPFS_XUSB_HOST_CLKGATE_HYSTERESIS_0);
+       }
 }
 
 static int tegra_xusb_clk_enable(struct tegra_xusb *tegra)
@@ -1015,10 +1020,12 @@ static int tegra_xusb_probe(struct platform_device *pdev)
        if (IS_ERR(tegra->fpci_base))
                return PTR_ERR(tegra->fpci_base);
 
-       res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
-       tegra->ipfs_base = devm_ioremap_resource(&pdev->dev, res);
-       if (IS_ERR(tegra->ipfs_base))
-               return PTR_ERR(tegra->ipfs_base);
+       if (tegra->soc->has_ipfs) {
+               res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+               tegra->ipfs_base = devm_ioremap_resource(&pdev->dev, res);
+               if (IS_ERR(tegra->ipfs_base))
+                       return PTR_ERR(tegra->ipfs_base);
+       }
 
        tegra->xhci_irq = platform_get_irq(pdev, 0);
        if (tegra->xhci_irq < 0)
@@ -1208,7 +1215,7 @@ static int tegra_xusb_probe(struct platform_device *pdev)
                goto disable_rpm;
        }
 
-       tegra_xusb_ipfs_config(tegra, regs);
+       tegra_xusb_config(tegra, regs);
 
        err = tegra_xusb_load_firmware(tegra);
        if (err < 0) {
@@ -1380,6 +1387,7 @@ static const struct tegra_xusb_soc tegra124_soc = {
                .usb3 = { .offset = 0, .count = 2, },
        },
        .scale_ss_clock = true,
+       .has_ipfs = true,
 };
 MODULE_FIRMWARE("nvidia/tegra124/xusb.bin");
 
@@ -1411,6 +1419,7 @@ static const struct tegra_xusb_soc tegra210_soc = {
                .usb3 = { .offset = 0, .count = 4, },
        },
        .scale_ss_clock = false,
+       .has_ipfs = true,
 };
 MODULE_FIRMWARE("nvidia/tegra210/xusb.bin");