[PATCH v2 11/11] usb: musb: da8xx: Remove mach code

David Lechner
2016-03-17T03:38:17Z

Use the new phy-da8xx-usb driver to take the place of the mach code that
pokes CFGCHIP2 in the da8xx musb glue driver.

Signed-off-by: David Lechner <david@lechnology.com>
---

v2 changes: This is part of a previous patch that was split. This version uses
the new phy driver instead of a second clock. It also gets rid of more mach
code.

drivers/usb/musb/da8xx.c | 126 ++++++++++++-----------------------------------
1 file changed, 31 insertions(+), 95 deletions(-)

diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c
index 50f07a5..1d51711 100644
--- a/drivers/usb/musb/da8xx.c
+++ b/drivers/usb/musb/da8xx.c
@@ -30,13 +30,11 @@
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
+#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/usb/usb_phy_generic.h>

-#include <mach/da8xx.h>
-#include <linux/platform_data/usb-davinci.h>
-
#include "musb_core.h"

/*
@@ -80,61 +78,15 @@

#define DA8XX_MENTOR_CORE_OFFSET 0x400

-#define CFGCHIP2 IO_ADDRESS(DA8XX_SYSCFG0_BASE + DA8XX_CFGCHIP2_REG)
-
struct da8xx_glue {
struct device *dev;
struct platform_device *musb;
- struct platform_device *phy;
+ struct platform_device *usb_phy;
struct clk *clk;
+ struct phy *phy;
};

/*
- * REVISIT (PM): we should be able to keep the PHY in low power mode most
- * of the time (24 MHz oscillator and PLL off, etc.) by setting POWER.D0
- * and, when in host mode, autosuspending idle root ports... PHY_PLLON
- * (overriding SUSPENDM?) then likely needs to stay off.
- */
-
-static inline void phy_on(void)
-{
- u32 cfgchip2 = __raw_readl(CFGCHIP2);
-
- /*
- * Start the on-chip PHY and its PLL.
- */
- cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN);
- cfgchip2 |= CFGCHIP2_PHY_PLLON;
- __raw_writel(cfgchip2, CFGCHIP2);
-
- pr_info("Waiting for USB PHY clock good...\n");
- while (!(__raw_readl(CFGCHIP2) & CFGCHIP2_PHYCLKGD))
- cpu_relax();
-}
-
-static inline void phy_off(void)
-{
- u32 cfgchip2 = __raw_readl(CFGCHIP2);
-
- /*
- * Ensure that USB 1.1 reference clock is not being sourced from
- * USB 2.0 PHY. Otherwise do not power down the PHY.
- */
- if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX) &&
- (cfgchip2 & CFGCHIP2_USB1SUSPENDM)) {
- pr_warning("USB 1.1 clocked from USB 2.0 PHY -- "
- "can't power it down\n");
- return;
- }
-
- /*
- * Power down the on-chip PHY.
- */
- cfgchip2 |= CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN;
- __raw_writel(cfgchip2, CFGCHIP2);
-}
-
-/*
* Because we don't set CTRL.UINT, it's "important" to:
* - not read/write INTRUSB/INTRUSBE (except during
* initial setup, as a workaround);
@@ -383,31 +335,18 @@ static irqreturn_t da8xx_musb_interrupt(int irq, void *hci)
return ret;
}

+extern int da8xx_usb20_phy_set_mode(struct phy *phy, enum musb_mode mode);
+
static int da8xx_musb_set_mode(struct musb *musb, u8 musb_mode)
{
- u32 cfgchip2 = __raw_readl(CFGCHIP2);
+ struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);

- cfgchip2 &= ~CFGCHIP2_OTGMODE;
- switch (musb_mode) {
- case MUSB_HOST: /* Force VBUS valid, ID = 0 */
- cfgchip2 |= CFGCHIP2_FORCE_HOST;
- break;
- case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */
- cfgchip2 |= CFGCHIP2_FORCE_DEVICE;
- break;
- case MUSB_OTG: /* Don't override the VBUS/ID comparators */
- cfgchip2 |= CFGCHIP2_NO_OVERRIDE;
- break;
- default:
- dev_dbg(musb->controller, "Trying to set unsupported mode %u\n", musb_mode);
- }
-
- __raw_writel(cfgchip2, CFGCHIP2);
- return 0;
+ return da8xx_usb20_phy_set_mode(glue->phy, musb_mode);
}

static int da8xx_musb_init(struct musb *musb)
{
+ struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
void __iomem *reg_base = musb->ctrl_base;
u32 rev;
int ret = -ENODEV;
@@ -425,19 +364,24 @@ static int da8xx_musb_init(struct musb *musb)
goto fail;
}

+ ret = clk_prepare_enable(glue->clk);
+ if (ret) {
+ dev_err(glue->dev, "failed to enable clock\n");
+ goto fail;
+ }
+
setup_timer(&otg_workaround, otg_timer, (unsigned long)musb);

/* Reset the controller */
musb_writel(reg_base, DA8XX_USB_CTRL_REG, DA8XX_SOFT_RESET_MASK);

/* Start the on-chip PHY and its PLL. */
- phy_on();
+ phy_power_on(glue->phy);

msleep(5);

/* NOTE: IRQs are in mixed mode, not bypass to pure MUSB */
- pr_debug("DA8xx OTG revision %08x, PHY %03x, control %02x\n",
- rev, __raw_readl(CFGCHIP2),
+ pr_debug("DA8xx OTG revision %08x, control %02x\n", rev,
musb_readb(reg_base, DA8XX_USB_CTRL_REG));

musb->isr = da8xx_musb_interrupt;
@@ -448,9 +392,12 @@ fail:

static int da8xx_musb_exit(struct musb *musb)
{
+ struct da8xx_glue *glue = dev_get_drvdata(musb->controller->parent);
+
del_timer_sync(&otg_workaround);

- phy_off();
+ phy_power_off(glue->phy);
+ clk_disable_unprepare(glue->clk);

usb_put_phy(musb->xceiv);

@@ -503,19 +450,19 @@ static int da8xx_probe(struct platform_device *pdev)
return PTR_ERR(glue->clk);
}

- ret = clk_enable(glue->clk);
- if (ret) {
- dev_err(&pdev->dev, "failed to enable clock\n");
- goto err4;
+ glue->phy = devm_phy_get(&pdev->dev, "usbphy");
+ if (IS_ERR(glue->phy)) {
+ dev_err(&pdev->dev, "failed to get phy\n");
+ return PTR_ERR(glue->phy);
}

glue->dev = &pdev->dev;
pdata->platform_ops = &da8xx_ops;

- glue->phy = usb_phy_generic_register();
- if (IS_ERR(glue->phy)) {
- ret = PTR_ERR(glue->phy);
- goto err5;
+ glue->usb_phy = usb_phy_generic_register();
+ if (IS_ERR(glue->usb_phy)) {
+ dev_err(&pdev->dev, "failed to register usb_phy\n");
+ return PTR_ERR(glue->usb_phy);
}
platform_set_drvdata(pdev, glue);

@@ -541,22 +488,12 @@ static int da8xx_probe(struct platform_device *pdev)

glue->musb = musb = platform_device_register_full(&pinfo);
if (IS_ERR(musb)) {
- ret = PTR_ERR(musb);
dev_err(&pdev->dev, "failed to register musb device: %d\n", ret);
- goto err6;
+ usb_phy_generic_unregister(glue->usb_phy);
+ return PTR_ERR(musb);
}

return 0;
-
-err6:
- usb_phy_generic_unregister(glue->phy);
-
-err5:
- clk_disable(glue->clk);
-
-err4:
-
- return ret;
}

static int da8xx_remove(struct platform_device *pdev)
@@ -564,8 +501,7 @@ static int da8xx_remove(struct platform_device *pdev)
struct da8xx_glue *glue = platform_get_drvdata(pdev);

platform_device_unregister(glue->musb);
- usb_phy_generic_unregister(glue->phy);
- clk_disable(glue->clk);
+ usb_phy_generic_unregister(glue->usb_phy);

return 0;
}
--
1.9.1