diff mbox

[02/04] PCI: rcar: Break out window size handling

Message ID 20140205065315.29445.65734.sendpatchset@w520 (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Magnus Damm Feb. 5, 2014, 6:53 a.m. UTC 
From: Magnus Damm <damm@opensource.se>

Break out the hard coded window size code to allow
dynamic setup. The window size is still left at 1GiB
but with this patch changing window size is easy for
testing.

Signed-off-by: Magnus Damm <damm@opensource.se>
---

 drivers/pci/host/pci-rcar-gen2.c |   31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

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diff mbox

Patch

--- 0005/drivers/pci/host/pci-rcar-gen2.c
+++ work/drivers/pci/host/pci-rcar-gen2.c	2014-02-04 17:22:41.000000000 +0900
@@ -18,6 +18,7 @@ 
 #include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
+#include <linux/sizes.h>
 #include <linux/slab.h>
 
 /* AHB-PCI Bridge PCI communication registers */
@@ -81,6 +82,7 @@  struct rcar_pci_priv {
 	struct resource mem_res;
 	struct resource *cfg_res;
 	int irq;
+	unsigned long window_size;
 };
 
 /* PCI configuration space operations */
@@ -180,10 +182,31 @@  static int __init rcar_pci_setup(int nr,
 	iowrite32(val, reg + RCAR_USBCTR_REG);
 	udelay(4);
 
-	/* De-assert reset and set PCIAHB window1 size to 1GB */
+	/* De-assert reset and reset PCIAHB window1 size */
 	val &= ~(RCAR_USBCTR_PCIAHB_WIN1_MASK | RCAR_USBCTR_PCICLK_MASK |
 		 RCAR_USBCTR_USBH_RST | RCAR_USBCTR_PLL_RST);
-	iowrite32(val | RCAR_USBCTR_PCIAHB_WIN1_1G, reg + RCAR_USBCTR_REG);
+
+	/* Setup PCIAHB window1 size */
+	switch (priv->window_size) {
+	case SZ_2G:
+		val |= RCAR_USBCTR_PCIAHB_WIN1_2G;
+		break;
+	case SZ_1G:
+		val |= RCAR_USBCTR_PCIAHB_WIN1_1G;
+		break;
+	case SZ_512M:
+		val |= RCAR_USBCTR_PCIAHB_WIN1_512M;
+		break;
+	default:
+		pr_warn("unknown window size %ld - defaulting to 256M\n",
+			priv->window_size);
+		priv->window_size = SZ_256M;
+		/* fall-through */
+	case SZ_256M:
+		val |= RCAR_USBCTR_PCIAHB_WIN1_256M;
+		break;
+	}
+	iowrite32(val, reg + RCAR_USBCTR_REG);
 
 	/* Configure AHB master and slave modes */
 	iowrite32(RCAR_AHB_BUS_MODE, reg + RCAR_AHB_BUS_CTR_REG);
@@ -194,7 +217,7 @@  static int __init rcar_pci_setup(int nr,
 	       RCAR_PCI_ARBITER_PCIBP_MODE;
 	iowrite32(val, reg + RCAR_PCI_ARBITER_CTR_REG);
 
-	/* PCI-AHB mapping: 0x40000000-0x80000000 */
+	/* PCI-AHB mapping: 0x40000000 base */
 	iowrite32(0x40000000 | RCAR_PCIAHB_PREFETCH16,
 		  reg + RCAR_PCIAHB_WIN1_CTR_REG);
 
@@ -271,6 +294,8 @@  static int rcar_pci_probe(struct platfor
 	priv->reg = reg;
 	priv->dev = &pdev->dev;
 
+	priv->window_size = SZ_1G;
+
 	memset(&hw, 0, sizeof(hw));
 	hw.nr_controllers = 1;
 	hw.private_data = (void **)&priv;