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USB: add ehci-ppc-of bus glue (device-tree aware)
This adds device-tree-aware ehci-ppc-of driver. The code is based on the ehci-ppc-soc driver by Stefan Roese <sr@denx.de>. Signed-off-by: Valentine Barshak <vbarshak@ru.mvista.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Stefan Roese <sr@denx.de> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Valentine Barshak
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Greg Kroah-Hartman
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Feb 1, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,238 @@ | ||
| /* | ||
| * EHCI HCD (Host Controller Driver) for USB. | ||
| * | ||
| * Bus Glue for PPC On-Chip EHCI driver on the of_platform bus | ||
| * Tested on AMCC PPC 440EPx | ||
| * | ||
| * Valentine Barshak <vbarshak@ru.mvista.com> | ||
| * | ||
| * Based on "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de> | ||
| * and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com> | ||
| * | ||
| * This file is licenced under the GPL. | ||
| */ | ||
|
|
||
| #include <linux/signal.h> | ||
|
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| #include <linux/of.h> | ||
| #include <linux/of_platform.h> | ||
|
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||
| /* called during probe() after chip reset completes */ | ||
| static int ehci_ppc_of_setup(struct usb_hcd *hcd) | ||
| { | ||
| struct ehci_hcd *ehci = hcd_to_ehci(hcd); | ||
| int retval; | ||
|
|
||
| retval = ehci_halt(ehci); | ||
| if (retval) | ||
| return retval; | ||
|
|
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| retval = ehci_init(hcd); | ||
| if (retval) | ||
| return retval; | ||
|
|
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| ehci->sbrn = 0x20; | ||
| return ehci_reset(ehci); | ||
| } | ||
|
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|
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| static const struct hc_driver ehci_ppc_of_hc_driver = { | ||
| .description = hcd_name, | ||
| .product_desc = "OF EHCI", | ||
| .hcd_priv_size = sizeof(struct ehci_hcd), | ||
|
|
||
| /* | ||
| * generic hardware linkage | ||
| */ | ||
| .irq = ehci_irq, | ||
| .flags = HCD_MEMORY | HCD_USB2, | ||
|
|
||
| /* | ||
| * basic lifecycle operations | ||
| */ | ||
| .reset = ehci_ppc_of_setup, | ||
| .start = ehci_run, | ||
| .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, | ||
|
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||
| /* | ||
| * root hub support | ||
| */ | ||
| .hub_status_data = ehci_hub_status_data, | ||
| .hub_control = ehci_hub_control, | ||
| #ifdef CONFIG_PM | ||
| .bus_suspend = ehci_bus_suspend, | ||
| .bus_resume = ehci_bus_resume, | ||
| #endif | ||
| }; | ||
|
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||
|
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| /* | ||
| * 440EPx Errata USBH_3 | ||
| * Fix: Enable Break Memory Transfer (BMT) in INSNREG3 | ||
| */ | ||
| #define PPC440EPX_EHCI0_INSREG_BMT (0x1 << 0) | ||
| static int __devinit | ||
| ppc44x_enable_bmt(struct device_node *dn) | ||
| { | ||
| __iomem u32 *insreg_virt; | ||
|
|
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| insreg_virt = of_iomap(dn, 1); | ||
| if (!insreg_virt) | ||
| return -EINVAL; | ||
|
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| out_be32(insreg_virt + 3, PPC440EPX_EHCI0_INSREG_BMT); | ||
|
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| iounmap(insreg_virt); | ||
| return 0; | ||
| } | ||
|
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|
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| static int __devinit | ||
| ehci_hcd_ppc_of_probe(struct of_device *op, const struct of_device_id *match) | ||
| { | ||
| struct device_node *dn = op->node; | ||
| struct usb_hcd *hcd; | ||
| struct ehci_hcd *ehci; | ||
| struct resource res; | ||
| int irq; | ||
| int rv; | ||
|
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| if (usb_disabled()) | ||
| return -ENODEV; | ||
|
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| dev_dbg(&op->dev, "initializing PPC-OF USB Controller\n"); | ||
|
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| rv = of_address_to_resource(dn, 0, &res); | ||
| if (rv) | ||
| return rv; | ||
|
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| hcd = usb_create_hcd(&ehci_ppc_of_hc_driver, &op->dev, "PPC-OF USB"); | ||
| if (!hcd) | ||
| return -ENOMEM; | ||
|
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| hcd->rsrc_start = res.start; | ||
| hcd->rsrc_len = res.end - res.start + 1; | ||
|
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| if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) { | ||
| printk(KERN_ERR __FILE__ ": request_mem_region failed\n"); | ||
| rv = -EBUSY; | ||
| goto err_rmr; | ||
| } | ||
|
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||
| irq = irq_of_parse_and_map(dn, 0); | ||
| if (irq == NO_IRQ) { | ||
| printk(KERN_ERR __FILE__ ": irq_of_parse_and_map failed\n"); | ||
| rv = -EBUSY; | ||
| goto err_irq; | ||
| } | ||
|
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| hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); | ||
| if (!hcd->regs) { | ||
| printk(KERN_ERR __FILE__ ": ioremap failed\n"); | ||
| rv = -ENOMEM; | ||
| goto err_ioremap; | ||
| } | ||
|
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| ehci = hcd_to_ehci(hcd); | ||
|
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| if (of_get_property(dn, "big-endian", NULL)) { | ||
| ehci->big_endian_mmio = 1; | ||
| ehci->big_endian_desc = 1; | ||
| } | ||
| if (of_get_property(dn, "big-endian-regs", NULL)) | ||
| ehci->big_endian_mmio = 1; | ||
| if (of_get_property(dn, "big-endian-desc", NULL)) | ||
| ehci->big_endian_desc = 1; | ||
|
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||
| ehci->caps = hcd->regs; | ||
| ehci->regs = hcd->regs + | ||
| HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase)); | ||
|
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| /* cache this readonly data; minimize chip reads */ | ||
| ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params); | ||
|
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| if (of_device_is_compatible(dn, "ibm,usb-ehci-440epx")) { | ||
| rv = ppc44x_enable_bmt(dn); | ||
| ehci_dbg(ehci, "Break Memory Transfer (BMT) is %senabled!\n", | ||
| rv ? "NOT ": ""); | ||
| } | ||
|
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| rv = usb_add_hcd(hcd, irq, 0); | ||
| if (rv == 0) | ||
| return 0; | ||
|
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| iounmap(hcd->regs); | ||
| err_ioremap: | ||
| irq_dispose_mapping(irq); | ||
| err_irq: | ||
| release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | ||
| err_rmr: | ||
| usb_put_hcd(hcd); | ||
|
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| return rv; | ||
| } | ||
|
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|
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| static int ehci_hcd_ppc_of_remove(struct of_device *op) | ||
| { | ||
| struct usb_hcd *hcd = dev_get_drvdata(&op->dev); | ||
| dev_set_drvdata(&op->dev, NULL); | ||
|
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| dev_dbg(&op->dev, "stopping PPC-OF USB Controller\n"); | ||
|
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| usb_remove_hcd(hcd); | ||
|
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| iounmap(hcd->regs); | ||
| irq_dispose_mapping(hcd->irq); | ||
| release_mem_region(hcd->rsrc_start, hcd->rsrc_len); | ||
|
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| usb_put_hcd(hcd); | ||
|
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| return 0; | ||
| } | ||
|
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|
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| static int ehci_hcd_ppc_of_shutdown(struct of_device *op) | ||
| { | ||
| struct usb_hcd *hcd = dev_get_drvdata(&op->dev); | ||
|
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| if (hcd->driver->shutdown) | ||
| hcd->driver->shutdown(hcd); | ||
|
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| return 0; | ||
| } | ||
|
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|
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| static struct of_device_id ehci_hcd_ppc_of_match[] = { | ||
| { | ||
| .compatible = "usb-ehci", | ||
| }, | ||
| {}, | ||
| }; | ||
| MODULE_DEVICE_TABLE(of, ehci_hcd_ppc_of_match); | ||
|
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|
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| static struct of_platform_driver ehci_hcd_ppc_of_driver = { | ||
| .name = "ppc-of-ehci", | ||
| .match_table = ehci_hcd_ppc_of_match, | ||
| .probe = ehci_hcd_ppc_of_probe, | ||
| .remove = ehci_hcd_ppc_of_remove, | ||
| .shutdown = ehci_hcd_ppc_of_shutdown, | ||
| .driver = { | ||
| .name = "ppc-of-ehci", | ||
| .owner = THIS_MODULE, | ||
| }, | ||
| }; |
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