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USB: EHCI: tegra: fix circular module dependencies 

The Tegra EHCI driver directly calls various functions in the Tegra USB
PHY driver. The reverse is also true; the PHY driver calls into the EHCI
driver. This is problematic when the two are built as modules.

The calls from the PHY to EHCI driver were originally added in commit
bbdabdb "usb: add APIs to access host registers from Tegra PHY", for the
following reasons:

1) The register being touched is an EHCI register, so logically only the
   EHCI driver should touch it.
2) (1) implies that some locking may be needed to correctly implement the
   r/m/w access to this shared register.
3) We were expecting to pass only the PHY register space to the Tegra PHY
   driver, and hence it would not have access to touch the shared
   registers.

To solve this, that commit added functions in the EHCI driver to touch the
shared register on behalf of the PHY driver.

In practice, we ended up not having any locking in the implementaiton of
those functions, and I've been led to believe this is safe. Equally, (3)
did not happen either. Hence, it is possible for the PHY driver to touch
the shared register directly.

Given that, this patch moves the code to touch the shared register back
into the PHY driver, to eliminate the module problems. If we actually
need locking or co-ordination in the future, I propose we put the lock
support into some pre-existing core module, or into a third separate
module, in order to avoid the circular dependencies.

I apologize for my contribution to code churn here.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Warren 2013-06-13 11:24:11 -06:00 committed by Greg Kroah-Hartman
parent a4faa54e3a
commit 91a687d8fe
3 changed files with 36 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/usb/host/ehci-tegra.c
View File

@ -34,11 +34,6 @@
#define TEGRA_USB2_BASE 0xC5004000
#define TEGRA_USB3_BASE 0xC5008000
/* PORTSC registers */
#define TEGRA_USB_PORTSC1 0x184
#define TEGRA_USB_PORTSC1_PTS(x) (((x) & 0x3) << 30)
#define TEGRA_USB_PORTSC1_PHCD (1 << 23)
#define TEGRA_USB_DMA_ALIGN 32
struct tegra_ehci_hcd {
@ -380,37 +375,6 @@ static int setup_vbus_gpio(struct platform_device *pdev,
return err;
}
/* Bits of PORTSC1, which will get cleared by writing 1 into them */
#define TEGRA_PORTSC1_RWC_BITS (PORT_CSC | PORT_PEC | PORT_OCC)
void tegra_ehci_set_pts(struct usb_phy *x, u8 pts_val)
{
unsigned long val;
struct usb_hcd *hcd = bus_to_hcd(x->otg->host);
void __iomem *base = hcd->regs;
val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
val &= ~TEGRA_USB_PORTSC1_PTS(3);
val |= TEGRA_USB_PORTSC1_PTS(pts_val & 3);
writel(val, base + TEGRA_USB_PORTSC1);
}
EXPORT_SYMBOL_GPL(tegra_ehci_set_pts);
void tegra_ehci_set_phcd(struct usb_phy *x, bool enable)
{
unsigned long val;
struct usb_hcd *hcd = bus_to_hcd(x->otg->host);
void __iomem *base = hcd->regs;
val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
if (enable)
val |= TEGRA_USB_PORTSC1_PHCD;
else
val &= ~TEGRA_USB_PORTSC1_PHCD;
writel(val, base + TEGRA_USB_PORTSC1);
}
EXPORT_SYMBOL_GPL(tegra_ehci_set_phcd);
static int tegra_ehci_probe(struct platform_device *pdev)
{
struct resource *res;

39
drivers/usb/phy/phy-tegra-usb.c
View File

@ -32,11 +32,20 @@
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
#include <asm/mach-types.h>
#include <linux/usb/ehci_def.h>
#include <linux/usb/tegra_usb_phy.h>
#include <linux/module.h>
#define ULPI_VIEWPORT 0x170
/* PORTSC registers */
#define TEGRA_USB_PORTSC1 0x184
#define TEGRA_USB_PORTSC1_PTS(x) (((x) & 0x3) << 30)
#define TEGRA_USB_PORTSC1_PHCD (1 << 23)
/* Bits of PORTSC1, which will get cleared by writing 1 into them */
#define TEGRA_PORTSC1_RWC_BITS (PORT_CSC | PORT_PEC | PORT_OCC)
#define USB_SUSP_CTRL 0x400
#define USB_WAKE_ON_CNNT_EN_DEV (1 << 3)
#define USB_WAKE_ON_DISCON_EN_DEV (1 << 4)
@ -197,6 +206,30 @@ static struct tegra_utmip_config utmip_default[] = {
},
};
static void set_pts(struct tegra_usb_phy *phy, u8 pts_val)
{
void __iomem *base = phy->regs;
unsigned long val;
val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
val &= ~TEGRA_USB_PORTSC1_PTS(3);
val |= TEGRA_USB_PORTSC1_PTS(pts_val & 3);
writel(val, base + TEGRA_USB_PORTSC1);
}
static void set_phcd(struct tegra_usb_phy *phy, bool enable)
{
void __iomem *base = phy->regs;
unsigned long val;
val = readl(base + TEGRA_USB_PORTSC1) & ~TEGRA_PORTSC1_RWC_BITS;
if (enable)
val |= TEGRA_USB_PORTSC1_PHCD;
else
val &= ~TEGRA_USB_PORTSC1_PHCD;
writel(val, base + TEGRA_USB_PORTSC1);
}
static int utmip_pad_open(struct tegra_usb_phy *phy)
{
phy->pad_clk = devm_clk_get(phy->dev, "utmi-pads");
@ -283,7 +316,7 @@ static void utmi_phy_clk_disable(struct tegra_usb_phy *phy)
val &= ~USB_SUSP_SET;
writel(val, base + USB_SUSP_CTRL);
} else
tegra_ehci_set_phcd(&phy->u_phy, true);
set_phcd(phy, true);
if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID, 0) < 0)
pr_err("%s: timeout waiting for phy to stabilize\n", __func__);
@ -305,7 +338,7 @@ static void utmi_phy_clk_enable(struct tegra_usb_phy *phy)
val &= ~USB_SUSP_CLR;
writel(val, base + USB_SUSP_CTRL);
} else
tegra_ehci_set_phcd(&phy->u_phy, false);
set_phcd(phy, false);
if (utmi_wait_register(base + USB_SUSP_CTRL, USB_PHY_CLK_VALID,
USB_PHY_CLK_VALID))
@ -428,7 +461,7 @@ static int utmi_phy_power_on(struct tegra_usb_phy *phy)
utmi_phy_clk_enable(phy);
if (!phy->is_legacy_phy)
tegra_ehci_set_pts(&phy->u_phy, 0);
set_pts(phy, 0);
return 0;
}

4
include/linux/usb/tegra_usb_phy.h
View File

@ -76,8 +76,4 @@ void tegra_ehci_phy_restore_start(struct usb_phy *phy,
void tegra_ehci_phy_restore_end(struct usb_phy *phy);
void tegra_ehci_set_pts(struct usb_phy *x, u8 pts_val);
void tegra_ehci_set_phcd(struct usb_phy *x, bool enable);
#endif /* __TEGRA_USB_PHY_H */