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usb: uhci: Add clk support to uhci-platform 

The Aspeed SoCs use uhci-platform. With the new dynamic clock
control framework, the corresponding IP block clock must be
properly enabled.

This is a simplified variant of what ehci-platform does, it
looks for *one* clock attached to the device, and if it's
there, enables it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Benjamin Herrenschmidt 2018-01-16 20:53:14 +11:00 committed by Greg Kroah-Hartman
parent cbeef22fd6
commit 26c502701c
2 changed files with 23 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/usb/host/uhci-hcd.h
View File

@ -4,6 +4,7 @@
#include <linux/list.h>
#include <linux/usb.h>
#include <linux/clk.h>
#define usb_packetid(pipe) (usb_pipein(pipe) ? USB_PID_IN : USB_PID_OUT)
#define PIPE_DEVEP_MASK 0x0007ff00
@ -447,6 +448,8 @@ struct uhci_hcd {
int total_load; /* Sum of array values */
short load[MAX_PHASE]; /* Periodic allocations */
struct clk *clk; /* (optional) clock source */
/* Reset host controller */
void (*reset_hc) (struct uhci_hcd *uhci);
int (*check_and_reset_hc) (struct uhci_hcd *uhci);

23
drivers/usb/host/uhci-platform.c
View File

@ -89,6 +89,8 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
if (!hcd)
return -ENOMEM;
uhci = hcd_to_uhci(hcd);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
hcd->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(hcd->regs)) {
@ -98,8 +100,6 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
uhci = hcd_to_uhci(hcd);
uhci->regs = hcd->regs;
/* Grab some things from the device-tree */
@ -119,13 +119,28 @@ static int uhci_hcd_platform_probe(struct platform_device *pdev)
"Enabled Aspeed implementation workarounds\n");
}
}
/* Get and enable clock if any specified */
uhci->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(uhci->clk)) {
ret = PTR_ERR(uhci->clk);
goto err_rmr;
}
ret = clk_prepare_enable(uhci->clk);
if (ret) {
dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret);
goto err_rmr;
}
ret = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
if (ret)
goto err_rmr;
goto err_clk;
device_wakeup_enable(hcd->self.controller);
return 0;
err_clk:
clk_disable_unprepare(uhci->clk);
err_rmr:
usb_put_hcd(hcd);
@ -135,7 +150,9 @@ err_rmr:
static int uhci_hcd_platform_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
clk_disable_unprepare(uhci->clk);
usb_remove_hcd(hcd);
usb_put_hcd(hcd);