Skip to content

L
linux-davinci
Commit 311c4190 authored by David Brownell's avatar David Brownell Committed by Tony Lindgren
Browse files
Options

ehci-omap: (mostly) cosmetic cleanups 

Various cleanups to the OMAP EHCI bus glue:

 - Whitespace fixes.

 - Busy-wait loops should really have timeouts, but lacking
   that ... at least cpu_relax() in the body.

 - Debug messages should end with newlines, so they don't
   break the next message; should not embed newlines; and
   should otherwise be clean and correctly spelled.

 - The probe() method should have initialized the SBRN value,
   so the driver didn't report "USB 0.0 started".

 - The MODULE_ALIAS() was missing its "platform:" prefix;
   doing it right means the module could hotplug/coldplug.

No real functional change except for the hotplug/coldplug thing.
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 3da0e102
Hide whitespace changes
Inline Side-by-side
Showing with 43 additions and 32 deletions
drivers/usb/host/ehci-omap.c
View file @ 311c4190
......@@ -5,7 +5,7 @@
* Tested on OMAP3430 ES2.0 SDP
*
* Copyright (C) 2007-2008 Texas Instruments, Inc.
* Author: Vikram Pandita <vikram.pandita@ti.com>
* Author: Vikram Pandita <vikram.pandita@ti.com>
*
* Based on "ehci-fsl.c" and "ehci-au1xxx.c" ehci glue layers
*
......@@ -42,10 +42,10 @@
/* ISSUE1:
* ISP1504 for input clocking mode needs special reset handling
* Hold the PHY in reset by asserting RESET_N signal
* Then start the 60Mhz clock input to PHY
* Release the reset after a delay -
* to get the PHY state machine in working state
* Hold the PHY in reset by asserting RESET_N signal
* Then start the 60Mhz clock input to PHY
* Release the reset after a delay -
* to get the PHY state machine in working state
*/
#define EXTERNAL_PHY_RESET
#define EXT_PHY_RESET_GPIO_PORT1 (57)
......@@ -95,8 +95,9 @@ static void omap_usb_utmi_init(struct usb_hcd *hcd, u8 tll_channel_mask)
(0<<OMAP_UHH_HOSTCONFIG_INCRX_ALIGN_EN_SHIFT),
OMAP_UHH_HOSTCONFIG);
/* Enusre bit is set */
while (!(omap_readl(OMAP_UHH_HOSTCONFIG) &
(1 << OMAP_UHH_HOSTCONFIG_ULPI_BYPASS_SHIFT)));
while (!(omap_readl(OMAP_UHH_HOSTCONFIG)
& (1 << OMAP_UHH_HOSTCONFIG_ULPI_BYPASS_SHIFT)))
cpu_relax();
dev_dbg(hcd->self.controller, "\nEntered UTMI MODE: success\n");
......@@ -150,13 +151,13 @@ static void omap_usb_utmi_init(struct usb_hcd *hcd, u8 tll_channel_mask)
/* omap_start_ehc
* - Start the TI USBHOST controller
* - Start the TI USBHOST controller
*/
static int omap_start_ehc(struct platform_device *dev, struct usb_hcd *hcd)
{
struct ehci_omap_clock_defs *ehci_clocks;
dev_dbg(hcd->self.controller, ": starting TI EHCI USB Controller\n");
dev_dbg(hcd->self.controller, "starting TI EHCI USB Controller\n");
ehci_clocks = (struct ehci_omap_clock_defs *)(
((char *)hcd_to_ehci(hcd)) +
......@@ -250,17 +251,19 @@ static int omap_start_ehc(struct platform_device *dev, struct usb_hcd *hcd)
CORE_MOD, CM_AUTOIDLE3);
/* Wait for TLL to be Active */
while ((cm_read_mod_reg(CORE_MOD, OMAP2430_CM_IDLEST3) &
(1 << OMAP3430ES2_ST_USBTLL_SHIFT)));
while ((cm_read_mod_reg(CORE_MOD, OMAP2430_CM_IDLEST3)
& (1 << OMAP3430ES2_ST_USBTLL_SHIFT)))
cpu_relax();
/* perform TLL soft reset, and wait until reset is complete */
omap_writel(1 << OMAP_USBTLL_SYSCONFIG_SOFTRESET_SHIFT,
OMAP_USBTLL_SYSCONFIG);
/* Wait for TLL reset to complete */
while (!(omap_readl(OMAP_USBTLL_SYSSTATUS) &
(1 << OMAP_USBTLL_SYSSTATUS_RESETDONE_SHIFT)));
while (!(omap_readl(OMAP_USBTLL_SYSSTATUS)
& (1 << OMAP_USBTLL_SYSSTATUS_RESETDONE_SHIFT)))
cpu_relax();
dev_dbg(hcd->self.controller, "\n TLL RESET DONE\n");
dev_dbg(hcd->self.controller, "TLL RESET DONE\n");
/* (1<<3) = no idle mode only for initial debugging */
omap_writel((1 << OMAP_USBTLL_SYSCONFIG_ENAWAKEUP_SHIFT) |
......@@ -286,10 +289,11 @@ static int omap_start_ehc(struct platform_device *dev, struct usb_hcd *hcd)
(0<<OMAP_UHH_HOSTCONFIG_INCRX_ALIGN_EN_SHIFT),
OMAP_UHH_HOSTCONFIG);
/* Ensure that BYPASS is set */
while (omap_readl(OMAP_UHH_HOSTCONFIG) &
(1 << OMAP_UHH_HOSTCONFIG_ULPI_BYPASS_SHIFT));
while (omap_readl(OMAP_UHH_HOSTCONFIG)
& (1 << OMAP_UHH_HOSTCONFIG_ULPI_BYPASS_SHIFT))
cpu_relax();
dev_dbg(hcd->self.controller, "Entered ULPI PHY MODE: success");
dev_dbg(hcd->self.controller, "Entered ULPI PHY MODE: success\n");
#else
/* Enable UTMI mode for all 3 TLL channels */
......@@ -313,7 +317,7 @@ static int omap_start_ehc(struct platform_device *dev, struct usb_hcd *hcd)
/* Refer ISSUE2: LINK assumes external charge pump */
/* use Port1 VBUS to charge externally Port2:
* So for PHY mode operation use Port2 only
* So for PHY mode operation use Port2 only
*/
omap_writel((0xA << EHCI_INSNREG05_ULPI_REGADD_SHIFT) |/* OTG ctrl reg*/
(2 << EHCI_INSNREG05_ULPI_OPSEL_SHIFT) |/* Write */
......@@ -322,8 +326,9 @@ static int omap_start_ehc(struct platform_device *dev, struct usb_hcd *hcd)
(0x26),
EHCI_INSNREG05_ULPI);
while (!(omap_readl(EHCI_INSNREG05_ULPI) &
(1<<EHCI_INSNREG05_ULPI_CONTROL_SHIFT)));
while (!(omap_readl(EHCI_INSNREG05_ULPI)
& (1<<EHCI_INSNREG05_ULPI_CONTROL_SHIFT)))
cpu_relax();
#endif
......@@ -339,20 +344,24 @@ static void omap_stop_ehc(struct platform_device *dev, struct usb_hcd *hcd)
ehci_clocks = (struct ehci_omap_clock_defs *)
(((char *)hcd_to_ehci(hcd)) + sizeof(struct ehci_hcd));
dev_dbg(hcd->self.controller, ": stopping TI EHCI USB Controller\n");
dev_dbg(hcd->self.controller, "stopping TI EHCI USB Controller\n");
/* Reset OMAP modules for insmod/rmmod to work */
omap_writel((1<<1), OMAP_UHH_SYSCONFIG);
while (!(omap_readl(OMAP_UHH_SYSSTATUS) & (1<<0)));
while (!(omap_readl(OMAP_UHH_SYSSTATUS) & (1<<1)));
while (!(omap_readl(OMAP_UHH_SYSSTATUS) & (1<<2)));
while (!(omap_readl(OMAP_UHH_SYSSTATUS) & (1<<0)))
cpu_relax();
while (!(omap_readl(OMAP_UHH_SYSSTATUS) & (1<<1)))
cpu_relax();
while (!(omap_readl(OMAP_UHH_SYSSTATUS) & (1<<2)))
cpu_relax();
dev_dbg(hcd->self.controller,
"UHH RESET DONE OMAP_UHH_SYSSTATUS %x !!\n",
omap_readl(OMAP_UHH_SYSSTATUS));
omap_writel((1<<1), OMAP_USBTLL_SYSCONFIG);
while (!(omap_readl(OMAP_USBTLL_SYSSTATUS) & (1<<0)));
dev_dbg(hcd->self.controller, ":TLL RESEET DONE");
while (!(omap_readl(OMAP_USBTLL_SYSSTATUS) & (1<<0)))
cpu_relax();
dev_dbg(hcd->self.controller, "TLL RESET DONE\n");
if (ehci_clocks->usbtll_fck_clk != NULL) {
clk_disable(ehci_clocks->usbtll_fck_clk);
......@@ -391,7 +400,7 @@ static void omap_stop_ehc(struct platform_device *dev, struct usb_hcd *hcd)
#endif
dev_dbg(hcd->self.controller,
": Clock to USB host has been disabled\n");
"Clock to USB host has been disabled\n");
}
static const struct hc_driver ehci_omap_hc_driver;
......@@ -415,13 +424,13 @@ static int ehci_hcd_omap_drv_probe(struct platform_device *dev)
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
dev_dbg(&dev->dev, "ehci_hcd_omap_drv_probe()");
dev_dbg(&dev->dev, "ehci_hcd_omap_drv_probe()\n");
if (usb_disabled())
return -ENODEV;
if (dev->resource[1].flags != IORESOURCE_IRQ) {
dev_dbg(&dev->dev, "resource[1] is not IORESOURCE_IRQ");
dev_dbg(&dev->dev, "resource[1] is not IORESOURCE_IRQ\n");
retval = -ENOMEM;
}
......@@ -447,6 +456,8 @@ static int ehci_hcd_omap_drv_probe(struct platform_device *dev)
ehci = hcd_to_ehci(hcd);
ehci->caps = hcd->regs;
ehci->sbrn = 0x20;
ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = readl(&ehci->caps->hcs_params);
......@@ -459,7 +470,7 @@ static int ehci_hcd_omap_drv_probe(struct platform_device *dev)
if (retval == 0)
return retval;
dev_dbg(hcd->self.controller, "ERR: add_hcd");
dev_dbg(hcd->self.controller, "ERR: add_hcd\n");
omap_stop_ehc(dev, hcd);
iounmap(hcd->regs);
usb_put_hcd(hcd);
......@@ -486,7 +497,7 @@ static int ehci_hcd_omap_drv_remove(struct platform_device *dev)
{
struct usb_hcd *hcd = platform_get_drvdata(dev);
dev_dbg(&dev->dev, "ehci_hcd_omap_drv_remove()");
dev_dbg(&dev->dev, "ehci_hcd_omap_drv_remove()\n");
iounmap(hcd->regs);
usb_remove_hcd(hcd);
......@@ -554,7 +565,7 @@ static const struct hc_driver ehci_omap_hc_driver = {
};
/*-------------------------------------------------------------------------*/
MODULE_ALIAS("omap-ehci");
MODULE_ALIAS("platform:omap-ehci");
static struct platform_driver ehci_hcd_omap_driver = {
.probe = ehci_hcd_omap_drv_probe,
.remove = ehci_hcd_omap_drv_remove,
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment