| Message ID | 1383335158-19730-9-git-send-email-matt.porter@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi, On Saturday 02 November 2013 01:15 AM, Matt Porter wrote: > Add a driver for the internal Broadcom Kona USB 2.0 PHY found > on the BCM281xx family of SoCs. > > Signed-off-by: Matt Porter <matt.porter@linaro.org> > --- > drivers/phy/Kconfig | 6 ++ > drivers/phy/Makefile | 2 + > drivers/phy/phy-bcm-kona-usb2.c | 161 ++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 169 insertions(+) > create mode 100644 drivers/phy/phy-bcm-kona-usb2.c > > diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig > index 349bef2..cedada5 100644 > --- a/drivers/phy/Kconfig > +++ b/drivers/phy/Kconfig > @@ -15,4 +15,10 @@ config GENERIC_PHY > phy users can obtain reference to the PHY. All the users of this > framework should select this config. > > +config BCM_KONA_USB2_PHY > + tristate "Broadcom Kona USB2 PHY Driver" > + depends on GENERIC_PHY > + help > + Enable this to support the Broadcom Kona USB 2.0 PHY. > + > endmenu > diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile > index 9e9560f..ce83a14 100644 > --- a/drivers/phy/Makefile > +++ b/drivers/phy/Makefile > @@ -3,3 +3,5 @@ > # > > obj-$(CONFIG_GENERIC_PHY) += phy-core.o > + > +obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o > diff --git a/drivers/phy/phy-bcm-kona-usb2.c b/drivers/phy/phy-bcm-kona-usb2.c > new file mode 100644 > index 0000000..1beea7f > --- /dev/null > +++ b/drivers/phy/phy-bcm-kona-usb2.c > @@ -0,0 +1,161 @@ > +/* > + * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver > + * > + * Copyright (C) 2013 Linaro Limited > + * Matt Porter <matt.porter@linaro.org> > + * > + * This software is licensed under the terms of the GNU General Public > + * License version 2, as published by the Free Software Foundation, and > + * may be copied, distributed, and modified under those terms. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > + > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/delay.h> > +#include <linux/platform_device.h> > +#include <linux/err.h> > +#include <linux/io.h> > +#include <linux/clk.h> > +#include <linux/phy/phy.h> > + > +#define OTGCTL_OTGSTAT2 (1 << 31) > +#define OTGCTL_OTGSTAT1 (1 << 30) > +#define OTGCTL_PRST_N_SW (1 << 11) > +#define OTGCTL_HRESET_N (1 << 10) > +#define OTGCTL_UTMI_LINE_STATE1 (1 << 9) > +#define OTGCTL_UTMI_LINE_STATE0 (1 << 8) > + > +#define P1CTL_SOFT_RESET (1 << 1) > +#define P1CTL_NON_DRIVING (1 << 0) > + > +struct bcm_kona_usb_phy_regs { > + u32 ctrl; > + u32 cfg; > + u32 p1ctl; > + u32 status; > + u32 bc_cfg; > + u32 tp_in; > + u32 tp_out; > + u32 phy_ctrl; > + u32 usbreg; > + u32 usbproben; > +}; I would prefer to have constant macros for register offset unless you have a good reason to do otherwise. > + > +struct bcm_kona_usb { > + struct bcm_kona_usb_phy_regs *regs; > +}; > + > +static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on) > +{ > + u32 val; > + > + val = readl(&phy->regs->ctrl); > + if (on) { > + /* Configure and power PHY */ > + val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 | > + OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0); > + val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N; > + writel(val, &phy->regs->ctrl); > + > + /* Soft reset PHY */ > + val = readl(&phy->regs->p1ctl); > + val &= ~P1CTL_NON_DRIVING; > + val |= P1CTL_SOFT_RESET; > + writel(val, &phy->regs->p1ctl); > + writel(val & ~P1CTL_SOFT_RESET, &phy->regs->p1ctl); > + /* Reset needs to be asserted for 2ms */ > + mdelay(2); > + writel(val | P1CTL_SOFT_RESET, &phy->regs->p1ctl); Is soft reset needed for every power-on? Shouldn't soft reset be present in phy_init? Cheers Kishon
On Mon, Nov 04, 2013 at 11:57:10AM +0530, Kishon Vijay Abraham I wrote: > Hi, > > On Saturday 02 November 2013 01:15 AM, Matt Porter wrote: > >Add a driver for the internal Broadcom Kona USB 2.0 PHY found > >on the BCM281xx family of SoCs. > > > >Signed-off-by: Matt Porter <matt.porter@linaro.org> > >--- > > drivers/phy/Kconfig | 6 ++ > > drivers/phy/Makefile | 2 + > > drivers/phy/phy-bcm-kona-usb2.c | 161 ++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 169 insertions(+) > > create mode 100644 drivers/phy/phy-bcm-kona-usb2.c > > > >diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig > >index 349bef2..cedada5 100644 > >--- a/drivers/phy/Kconfig > >+++ b/drivers/phy/Kconfig > >@@ -15,4 +15,10 @@ config GENERIC_PHY > > phy users can obtain reference to the PHY. All the users of this > > framework should select this config. > > > >+config BCM_KONA_USB2_PHY > >+ tristate "Broadcom Kona USB2 PHY Driver" > >+ depends on GENERIC_PHY > >+ help > >+ Enable this to support the Broadcom Kona USB 2.0 PHY. > >+ > > endmenu > >diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile > >index 9e9560f..ce83a14 100644 > >--- a/drivers/phy/Makefile > >+++ b/drivers/phy/Makefile > >@@ -3,3 +3,5 @@ > > # > > > > obj-$(CONFIG_GENERIC_PHY) += phy-core.o > >+ > >+obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o > >diff --git a/drivers/phy/phy-bcm-kona-usb2.c b/drivers/phy/phy-bcm-kona-usb2.c > >new file mode 100644 > >index 0000000..1beea7f > >--- /dev/null > >+++ b/drivers/phy/phy-bcm-kona-usb2.c > >@@ -0,0 +1,161 @@ > >+/* > >+ * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver > >+ * > >+ * Copyright (C) 2013 Linaro Limited > >+ * Matt Porter <matt.porter@linaro.org> > >+ * > >+ * This software is licensed under the terms of the GNU General Public > >+ * License version 2, as published by the Free Software Foundation, and > >+ * may be copied, distributed, and modified under those terms. > >+ * > >+ * This program is distributed in the hope that it will be useful, > >+ * but WITHOUT ANY WARRANTY; without even the implied warranty of > >+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > >+ * GNU General Public License for more details. > >+ */ > >+ > >+#include <linux/module.h> > >+#include <linux/of.h> > >+#include <linux/delay.h> > >+#include <linux/platform_device.h> > >+#include <linux/err.h> > >+#include <linux/io.h> > >+#include <linux/clk.h> > >+#include <linux/phy/phy.h> > >+ > >+#define OTGCTL_OTGSTAT2 (1 << 31) > >+#define OTGCTL_OTGSTAT1 (1 << 30) > >+#define OTGCTL_PRST_N_SW (1 << 11) > >+#define OTGCTL_HRESET_N (1 << 10) > >+#define OTGCTL_UTMI_LINE_STATE1 (1 << 9) > >+#define OTGCTL_UTMI_LINE_STATE0 (1 << 8) > >+ > >+#define P1CTL_SOFT_RESET (1 << 1) > >+#define P1CTL_NON_DRIVING (1 << 0) > >+ > >+struct bcm_kona_usb_phy_regs { > >+ u32 ctrl; > >+ u32 cfg; > >+ u32 p1ctl; > >+ u32 status; > >+ u32 bc_cfg; > >+ u32 tp_in; > >+ u32 tp_out; > >+ u32 phy_ctrl; > >+ u32 usbreg; > >+ u32 usbproben; > >+}; > > I would prefer to have constant macros for register offset unless > you have a good reason to do otherwise. I'll switch to constant macros in v3. It's just my personal preference for style. > >+ > >+struct bcm_kona_usb { > >+ struct bcm_kona_usb_phy_regs *regs; > >+}; > >+ > >+static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on) > >+{ > >+ u32 val; > >+ > >+ val = readl(&phy->regs->ctrl); > >+ if (on) { > >+ /* Configure and power PHY */ > >+ val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 | > >+ OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0); > >+ val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N; > >+ writel(val, &phy->regs->ctrl); > >+ > >+ /* Soft reset PHY */ > >+ val = readl(&phy->regs->p1ctl); > >+ val &= ~P1CTL_NON_DRIVING; > >+ val |= P1CTL_SOFT_RESET; > >+ writel(val, &phy->regs->p1ctl); > >+ writel(val & ~P1CTL_SOFT_RESET, &phy->regs->p1ctl); > >+ /* Reset needs to be asserted for 2ms */ > >+ mdelay(2); > >+ writel(val | P1CTL_SOFT_RESET, &phy->regs->p1ctl); > > Is soft reset needed for every power-on? Shouldn't soft reset be > present in phy_init? Not needed for every power-on. Yes, I've addressed that now for v3, thanks. -Matt
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 349bef2..cedada5 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -15,4 +15,10 @@ config GENERIC_PHY phy users can obtain reference to the PHY. All the users of this framework should select this config. +config BCM_KONA_USB2_PHY + tristate "Broadcom Kona USB2 PHY Driver" + depends on GENERIC_PHY + help + Enable this to support the Broadcom Kona USB 2.0 PHY. + endmenu diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 9e9560f..ce83a14 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -3,3 +3,5 @@ # obj-$(CONFIG_GENERIC_PHY) += phy-core.o + +obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o diff --git a/drivers/phy/phy-bcm-kona-usb2.c b/drivers/phy/phy-bcm-kona-usb2.c new file mode 100644 index 0000000..1beea7f --- /dev/null +++ b/drivers/phy/phy-bcm-kona-usb2.c @@ -0,0 +1,161 @@ +/* + * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver + * + * Copyright (C) 2013 Linaro Limited + * Matt Porter <matt.porter@linaro.org> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/module.h> +#include <linux/of.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/phy/phy.h> + +#define OTGCTL_OTGSTAT2 (1 << 31) +#define OTGCTL_OTGSTAT1 (1 << 30) +#define OTGCTL_PRST_N_SW (1 << 11) +#define OTGCTL_HRESET_N (1 << 10) +#define OTGCTL_UTMI_LINE_STATE1 (1 << 9) +#define OTGCTL_UTMI_LINE_STATE0 (1 << 8) + +#define P1CTL_SOFT_RESET (1 << 1) +#define P1CTL_NON_DRIVING (1 << 0) + +struct bcm_kona_usb_phy_regs { + u32 ctrl; + u32 cfg; + u32 p1ctl; + u32 status; + u32 bc_cfg; + u32 tp_in; + u32 tp_out; + u32 phy_ctrl; + u32 usbreg; + u32 usbproben; +}; + +struct bcm_kona_usb { + struct bcm_kona_usb_phy_regs *regs; +}; + +static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on) +{ + u32 val; + + val = readl(&phy->regs->ctrl); + if (on) { + /* Configure and power PHY */ + val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 | + OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0); + val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N; + writel(val, &phy->regs->ctrl); + + /* Soft reset PHY */ + val = readl(&phy->regs->p1ctl); + val &= ~P1CTL_NON_DRIVING; + val |= P1CTL_SOFT_RESET; + writel(val, &phy->regs->p1ctl); + writel(val & ~P1CTL_SOFT_RESET, &phy->regs->p1ctl); + /* Reset needs to be asserted for 2ms */ + mdelay(2); + writel(val | P1CTL_SOFT_RESET, &phy->regs->p1ctl); + } else { + val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N); + writel(val, &phy->regs->ctrl); + } +} + +static int bcm_kona_usb_phy_power_on(struct phy *gphy) +{ + struct bcm_kona_usb *phy = phy_get_drvdata(gphy); + + bcm_kona_usb_phy_power(phy, 1); + + return 0; +} + +static int bcm_kona_usb_phy_power_off(struct phy *gphy) +{ + struct bcm_kona_usb *phy = phy_get_drvdata(gphy); + + bcm_kona_usb_phy_power(phy, 0); + + return 0; +} + +static struct phy_ops ops = { + .power_on = bcm_kona_usb_phy_power_on, + .power_off = bcm_kona_usb_phy_power_off, + .owner = THIS_MODULE, +}; + +static int bcm_kona_usb2_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct bcm_kona_usb *phy; + struct resource *res; + struct phy *gphy; + struct phy_provider *phy_provider; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + phy->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(phy->regs)) + return PTR_ERR(phy->regs); + + platform_set_drvdata(pdev, phy); + + phy_provider = devm_of_phy_provider_register(dev, + of_phy_simple_xlate); + if (IS_ERR(phy_provider)) + return PTR_ERR(phy_provider); + + gphy = devm_phy_create(dev, &ops, NULL); + if (IS_ERR(gphy)) + return PTR_ERR(gphy); + + /* The Kona PHY supports an 8-bit wide UTMI interface */ + phy_set_bus_width(gphy, 8); + + phy_set_drvdata(gphy, phy); + + return 0; +} + +static const struct of_device_id bcm_kona_usb2_dt_ids[] = { + { .compatible = "brcm,kona-usb2-phy" }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids); + +static struct platform_driver bcm_kona_usb2_driver = { + .probe = bcm_kona_usb2_probe, + .driver = { + .name = "bcm-kona-usb2", + .owner = THIS_MODULE, + .of_match_table = bcm_kona_usb2_dt_ids, + }, +}; + +module_platform_driver(bcm_kona_usb2_driver); + +MODULE_ALIAS("platform:bcm-kona-usb2"); +MODULE_AUTHOR("Matt Porter"); +MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver"); +MODULE_LICENSE("GPL v2");
Add a driver for the internal Broadcom Kona USB 2.0 PHY found on the BCM281xx family of SoCs. Signed-off-by: Matt Porter <matt.porter@linaro.org> --- drivers/phy/Kconfig | 6 ++ drivers/phy/Makefile | 2 + drivers/phy/phy-bcm-kona-usb2.c | 161 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 169 insertions(+) create mode 100644 drivers/phy/phy-bcm-kona-usb2.c