[PATCH,RFC] Marvell Orion USB host support

(please keep CC list on replies)

From: Tzachi Perelstein <[email protected]>

Attached are some glue bits for the on-chip USB host controller
in the Marvell Orion family of ARM SoCs, which is basically EHCI-
compatible.

Any feedback appreciated.

Signed-off-by: Tzachi Perelstein <[email protected]>
Signed-off-by: Lennert Buytenhek <[email protected]>


Index: linux-2.6.22.1-orion.3.2/drivers/usb/host/ehci-hcd.c
===================================================================
--- linux-2.6.22.1-orion.3.2.orig/drivers/usb/host/ehci-hcd.c
+++ linux-2.6.22.1-orion.3.2/drivers/usb/host/ehci-hcd.c
@@ -940,6 +940,11 @@ MODULE_LICENSE ("GPL");
 #define	PS3_SYSTEM_BUS_DRIVER	ps3_ehci_sb_driver
 #endif
 
+#ifdef CONFIG_ARCH_ORION
+#include "ehci-orion.c"
+#define	PLATFORM_DRIVER		ehci_orion_driver
+#endif
+
 #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
     !defined(PS3_SYSTEM_BUS_DRIVER)
 #error "missing bus glue for ehci-hcd"
Index: linux-2.6.22.1-orion.3.2/drivers/usb/host/ehci-orion.c
===================================================================
--- /dev/null
+++ linux-2.6.22.1-orion.3.2/drivers/usb/host/ehci-orion.c
@@ -0,0 +1,293 @@
+/*
+ * drivers/usb/host/ehci-orion.c
+ *
+ * Tzachi Perelstein <[email protected]>
+ *
+ * This file is licensed under  the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <asm/arch/orion.h>
+
+
+#define rdl(off)	__raw_readl(hcd->regs + (off))
+#define wrl(off, val)	__raw_writel((val), hcd->regs + (off))
+
+#define USB_CAUSE		0x310
+#define USB_MASK		0x314
+#define USB_CMD			0x140
+#define USB_MODE		0x1a8
+#define USB_IPG			0x360
+#define USB_PHY_PWR_CTRL	0x400
+#define USB_PHY_TX_CTRL		0x420
+#define USB_PHY_RX_CTRL		0x430
+#define USB_PHY_IVREF_CTRL	0x440
+#define USB_PHY_TST_GRP_CTRL	0x450
+
+/*
+ * Implement Orion USB controller specification guidlines
+ */
+static void orion_usb_setup(struct usb_hcd *hcd)
+{
+	/*
+	 * Clear interrupt cause and mask
+	 */
+	wrl(USB_CAUSE, 0);
+	wrl(USB_MASK, 0);
+
+	/*
+	 * Reset controller
+	 */
+	wrl(USB_CMD, rdl(USB_CMD) | 0x2);
+	while (rdl(USB_CMD) & 0x2);
+
+	/*
+	 * GL# USB-10: Set IPG for non start of frame packets
+	 * Bits[14:8]=0xc
+	 */
+	wrl(USB_IPG, (rdl(USB_IPG) & ~0x7f00) | 0xc00);
+
+	/*
+	 * GL# USB-9: USB 2.0 Power Control
+	 * BG_VSEL[7:6]=0x1
+	 */
+	wrl(USB_PHY_PWR_CTRL, (rdl(USB_PHY_PWR_CTRL) & ~0xc0)| 0x40);
+
+	/*
+	 * GL# USB-1: USB PHY Tx Control - force calibration to '8'
+	 * TXDATA_BLOCK_EN[21]=0x1, EXT_RCAL_EN[13]=0x1, IMP_CAL[6:3]=0x8
+	 */
+	wrl(USB_PHY_TX_CTRL, (rdl(USB_PHY_TX_CTRL) & ~0x78) | 0x202040);
+
+	/*
+	 * GL# USB-3 GL# USB-9: USB PHY Rx Control
+	 * RXDATA_BLOCK_LENGHT[31:30]=0x3, EDGE_DET_SEL[27:26]=0,
+	 * CDR_FASTLOCK_EN[21]=0, DISCON_THRESHOLD[9:8]=0, SQ_THRESH[7:4]=0x1
+	 */
+	wrl(USB_PHY_RX_CTRL, (rdl(USB_PHY_RX_CTRL) & ~0xc2003f0) | 0xc0000010);
+
+	/*
+	 * GL# USB-3 GL# USB-9: USB PHY IVREF Control
+	 * PLLVDD12[1:0]=0x2, RXVDD[5:4]=0x3, Reserved[19]=0
+	 */
+	wrl(USB_PHY_IVREF_CTRL, (rdl(USB_PHY_IVREF_CTRL) & ~0x80003 ) | 0x32);
+
+	/*
+	 * GL# USB-3 GL# USB-9: USB PHY Test Group Control
+	 * REG_FIFO_SQ_RST[15]=0
+	 */
+	wrl(USB_PHY_TST_GRP_CTRL, rdl(USB_PHY_TST_GRP_CTRL) & ~0x8000);
+
+
+	/*
+	 * Stop and reset controller
+	 */
+	wrl(USB_CMD, rdl(USB_CMD) & ~0x1);
+	wrl(USB_CMD, rdl(USB_CMD) | 0x2);
+	while (rdl(USB_CMD) & 0x2);
+
+	/*
+	 * GL# USB-5 Streaming disable REG_USB_MODE[4]=1
+	 * TBD: This need to be done after each reset!
+	 * GL# USB-4 Setup USB Host mode
+	 */
+	wrl(USB_MODE, 0x13);
+}
+
+
+int usb_hcd_orion_probe(const struct hc_driver *driver,
+			struct platform_device *pdev)
+{
+	struct usb_hcd *hcd;
+	struct resource *res;
+	int irq, retval;
+
+	pr_debug("Initializing Orion-SoC USB Host Controller\n");
+
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!res) {
+		dev_err(&pdev->dev,
+			"Found HC with no IRQ. Check %s setup!\n",
+			pdev->dev.bus_id);
+		return -ENODEV;
+	}
+	irq = res->start;
+
+	hcd = usb_create_hcd(driver, &pdev->dev, pdev->dev.bus_id);
+	if (!hcd) {
+		retval = -ENOMEM;
+		goto err1;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev,
+			"Found HC with no register addr. Check %s setup!\n",
+			pdev->dev.bus_id);
+		retval = -ENODEV;
+		goto err2;
+	}
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = res->end - res->start + 1;
+	/*
+	 * All of this is not really necessary, since all Orion
+	 * registers are already ioremap by arch setup.
+	 */
+	if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
+				driver->description)) {
+		dev_dbg(&pdev->dev, "controller already in use\n");
+		retval = -EBUSY;
+		goto err2;
+	}
+	hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
+	if (hcd->regs == NULL) {
+		dev_dbg(&pdev->dev, "error mapping memory\n");
+		retval = -EFAULT;
+		goto err3;
+	}
+
+	/*
+	 * setup Orion USB controller
+	 */
+	orion_usb_setup(hcd);
+
+	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
+	if (retval != 0)
+		goto err4;
+
+	return retval;
+
+err4:
+	iounmap(hcd->regs);
+err3:
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+err2:
+	usb_put_hcd(hcd);
+err1:
+	dev_err(&pdev->dev, "init %s fail, %d\n",
+		pdev->dev.bus_id, retval);
+
+	return retval;
+}
+
+/*
+ * Reverses the effect of usb_hcd_orion_probe()
+ */
+void usb_hcd_orion_remove(struct usb_hcd *hcd, struct platform_device *pdev)
+{
+	usb_remove_hcd(hcd);
+	iounmap(hcd->regs);
+	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
+	usb_put_hcd(hcd);
+}
+
+static int ehci_orion_setup(struct usb_hcd *hcd)
+{
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+	int retval;
+
+	/*
+	 * registers start at offset 0x100
+	 */
+	ehci->caps = hcd->regs + 0x100;
+	ehci->regs = hcd->regs + 0x100 +
+		HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
+
+	/*
+	 * cache this readonly data; minimize chip reads
+	 */
+	ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
+
+	retval = ehci_halt(ehci);
+	if (retval)
+		return retval;
+
+	/*
+	 * data structure init
+	 */
+	retval = ehci_init(hcd);
+	if (retval)
+		return retval;
+
+	ehci->is_tdi_rh_tt = 1;
+	ehci->sbrn = 0x20;
+
+	ehci_reset(ehci);
+	ehci_port_power(ehci, 0);
+
+	return retval;
+}
+
+static const struct hc_driver ehci_orion_hc_driver = {
+	.description = hcd_name,
+	.product_desc = "Marvell Orion EHCI",
+	.hcd_priv_size = sizeof(struct ehci_hcd),
+
+	/*
+	 * generic hardware linkage
+	 */
+	.irq = ehci_irq,
+	.flags = HCD_USB2,
+
+	/*
+	 * basic lifecycle operations
+	 */
+	.reset = ehci_orion_setup,
+	.start = ehci_run,
+#ifdef CONFIG_PM
+	.suspend = ehci_bus_suspend,
+	.resume = ehci_bus_resume,
+#endif
+	.stop = ehci_stop,
+	.shutdown = ehci_shutdown,
+
+	/*
+	 * managing i/o requests and associated device resources
+	 */
+	.urb_enqueue = ehci_urb_enqueue,
+	.urb_dequeue = ehci_urb_dequeue,
+	.endpoint_disable = ehci_endpoint_disable,
+
+	/*
+	 * scheduling support
+	 */
+	.get_frame_number = ehci_get_frame,
+
+	/*
+	 * root hub support
+	 */
+	.hub_status_data = ehci_hub_status_data,
+	.hub_control = ehci_hub_control,
+	.bus_suspend = ehci_bus_suspend,
+	.bus_resume = ehci_bus_resume,
+};
+
+static int ehci_orion_drv_probe(struct platform_device *pdev)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	return usb_hcd_orion_probe(&ehci_orion_hc_driver, pdev);
+}
+
+static int ehci_orion_drv_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+	usb_hcd_orion_remove(hcd, pdev);
+
+	return 0;
+}
+
+MODULE_ALIAS("orion-ehci");
+
+static struct platform_driver ehci_orion_driver = {
+	.probe		= ehci_orion_drv_probe,
+	.remove		= ehci_orion_drv_remove,
+	.shutdown	= usb_hcd_platform_shutdown,
+	.driver.name	= "orion-ehci",
+};

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