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mx51: fix usb clock support

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Current code doesn't really enable the usb clocks so if they're disabled
when booting linux, the kernel/machine will hang as soon as someone is trying
to read a usb register

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Arnaud Patard (Rtp) 2010-12-20 16:48:58 +01:00 committed by Sascha Hauer
parent 8305ed75d1
commit 711669e5b8
2 changed files with 75 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
arch/arm/mach-mx5/clock-mx51-mx53.c
View File

@ -954,6 +954,41 @@ static struct clk usboh3_clk = {
.parent = &pll2_sw_clk,
.get_rate = clk_usboh3_get_rate,
.set_parent = clk_usboh3_set_parent,
.enable = _clk_ccgr_enable,
.disable = _clk_ccgr_disable,
.enable_reg = MXC_CCM_CCGR2,
.enable_shift = MXC_CCM_CCGRx_CG14_OFFSET,
};
static struct clk usb_ahb_clk = {
.parent = &ipg_clk,
.enable = _clk_ccgr_enable,
.disable = _clk_ccgr_disable,
.enable_reg = MXC_CCM_CCGR2,
.enable_shift = MXC_CCM_CCGRx_CG13_OFFSET,
};
static int clk_usb_phy1_set_parent(struct clk *clk, struct clk *parent)
{
u32 reg;
reg = __raw_readl(MXC_CCM_CSCMR1) & ~MXC_CCM_CSCMR1_USB_PHY_CLK_SEL;
if (parent == &pll3_sw_clk)
reg |= 1 << MXC_CCM_CSCMR1_USB_PHY_CLK_SEL_OFFSET;
__raw_writel(reg, MXC_CCM_CSCMR1);
return 0;
}
static struct clk usb_phy1_clk = {
.parent = &pll3_sw_clk,
.set_parent = clk_usb_phy1_set_parent,
.enable = _clk_ccgr_enable,
.enable_reg = MXC_CCM_CCGR2,
.enable_shift = MXC_CCM_CCGRx_CG0_OFFSET,
.disable = _clk_ccgr_disable,
};
/* eCSPI */
@ -1094,9 +1129,12 @@ static struct clk_lookup mx51_lookups[] = {
_REGISTER_CLOCK("imx-i2c.1", NULL, i2c2_clk)
_REGISTER_CLOCK("imx-i2c.2", NULL, hsi2c_clk)
_REGISTER_CLOCK("mxc-ehci.0", "usb", usboh3_clk)
_REGISTER_CLOCK("mxc-ehci.0", "usb_ahb", ahb_clk)
_REGISTER_CLOCK("mxc-ehci.0", "usb_ahb", usb_ahb_clk)
_REGISTER_CLOCK("mxc-ehci.0", "usb_phy1", usb_phy1_clk)
_REGISTER_CLOCK("mxc-ehci.1", "usb", usboh3_clk)
_REGISTER_CLOCK("mxc-ehci.1", "usb_ahb", ahb_clk)
_REGISTER_CLOCK("mxc-ehci.1", "usb_ahb", usb_ahb_clk)
_REGISTER_CLOCK("mxc-ehci.2", "usb", usboh3_clk)
_REGISTER_CLOCK("mxc-ehci.2", "usb_ahb", usb_ahb_clk)
_REGISTER_CLOCK("fsl-usb2-udc", "usb", usboh3_clk)
_REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", ahb_clk)
_REGISTER_CLOCK("imx-keypad.0", NULL, kpp_clk)
@ -1170,6 +1208,9 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc,
mx51_revision();
clk_disable(&iim_clk);
/* move usb_phy_clk to 24MHz */
clk_set_parent(&usb_phy1_clk, &osc_clk);
/* set the usboh3_clk parent to pll2_sw_clk */
clk_set_parent(&usboh3_clk, &pll2_sw_clk);

44
drivers/usb/host/ehci-mxc.c
View File

@ -28,7 +28,7 @@
#define ULPI_VIEWPORT_OFFSET 0x170
struct ehci_mxc_priv {
struct clk *usbclk, *ahbclk;
struct clk *usbclk, *ahbclk, *phy1clk;
struct usb_hcd *hcd;
};
@ -168,17 +168,6 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev)
goto err_ioremap;
}
/* call platform specific init function */
if (pdata->init) {
ret = pdata->init(pdev);
if (ret) {
dev_err(dev, "platform init failed\n");
goto err_init;
}
/* platforms need some time to settle changed IO settings */
mdelay(10);
}
/* enable clocks */
priv->usbclk = clk_get(dev, "usb");
if (IS_ERR(priv->usbclk)) {
@ -196,6 +185,28 @@ static int ehci_mxc_drv_probe(struct platform_device *pdev)
clk_enable(priv->ahbclk);
}
/* "dr" device has its own clock */
if (pdev->id == 0) {
priv->phy1clk = clk_get(dev, "usb_phy1");
if (IS_ERR(priv->phy1clk)) {
ret = PTR_ERR(priv->phy1clk);
goto err_clk_phy;
}
clk_enable(priv->phy1clk);
}
/* call platform specific init function */
if (pdata->init) {
ret = pdata->init(pdev);
if (ret) {
dev_err(dev, "platform init failed\n");
goto err_init;
}
/* platforms need some time to settle changed IO settings */
mdelay(10);
}
/* setup specific usb hw */
ret = mxc_initialize_usb_hw(pdev->id, pdata->flags);
if (ret < 0)
@ -230,6 +241,11 @@ err_add:
if (pdata && pdata->exit)
pdata->exit(pdev);
err_init:
if (priv->phy1clk) {
clk_disable(priv->phy1clk);
clk_put(priv->phy1clk);
}
err_clk_phy:
if (priv->ahbclk) {
clk_disable(priv->ahbclk);
clk_put(priv->ahbclk);
@ -273,6 +289,10 @@ static int __exit ehci_mxc_drv_remove(struct platform_device *pdev)
clk_disable(priv->ahbclk);
clk_put(priv->ahbclk);
}
if (priv->phy1clk) {
clk_disable(priv->phy1clk);
clk_put(priv->phy1clk);
}
kfree(priv);