| Message ID | 20191021131305.8689-3-rogerq@ti.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | usb: cdns3: Add TI wrapper | expand |
On 19-10-21 16:13:05, Roger Quadros wrote: > The J721e platform comes with 2 Cadence USB3 controller > instances. This driver supports the TI specific wrapper > on this platform. > > Signed-off-by: Roger Quadros <rogerq@ti.com> > Signed-off-by: Sekhar Nori <nsekhar@ti.com> > --- > drivers/usb/cdns3/Kconfig | 10 ++ > drivers/usb/cdns3/Makefile | 1 + > drivers/usb/cdns3/cdns3-ti.c | 236 +++++++++++++++++++++++++++++++++++ > 3 files changed, 247 insertions(+) > create mode 100644 drivers/usb/cdns3/cdns3-ti.c > > diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig > index d0331613a355..2a1e89d12ed9 100644 > --- a/drivers/usb/cdns3/Kconfig > +++ b/drivers/usb/cdns3/Kconfig > @@ -43,4 +43,14 @@ config USB_CDNS3_PCI_WRAP > If you choose to build this driver as module it will > be dynamically linked and module will be called cdns3-pci.ko > > +config USB_CDNS3_TI > + tristate "Cadence USB3 support on TI platforms" > + depends on ARCH_K3 || COMPILE_TEST > + default USB_CDNS3 > + help > + Say 'Y' or 'M' here if you are building for Texas Instruments > + platforms that contain Cadence USB3 controller core. > + > + e.g. J721e. > + > endif > diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile > index a703547350bb..948e6b88d1a9 100644 > --- a/drivers/usb/cdns3/Makefile > +++ b/drivers/usb/cdns3/Makefile > @@ -14,3 +14,4 @@ endif > cdns3-$(CONFIG_USB_CDNS3_HOST) += host.o > > obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci-wrap.o > +obj-$(CONFIG_USB_CDNS3_TI) += cdns3-ti.o > diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c > new file mode 100644 > index 000000000000..5541cba71965 > --- /dev/null > +++ b/drivers/usb/cdns3/cdns3-ti.c > @@ -0,0 +1,236 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/** > + * cdns_ti-ti.c - TI specific Glue layer for Cadence USB Controller cdns3-ti.c > + * > + * Copyright (C) 2019 Texas Instruments Incorporated - https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ti.com&data=02%7C01%7Cpeter.chen%40nxp.com%7C94aad23d5a294c5cdaf808d75628931c%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637072604595033025&sdata=Lye5SayAKcqAMaNGbZ%2Fq5OkUZ8IsWMVgGmeh8IhA69M%3D&reserved=0 > + */ > + > +#include <linux/bits.h> > +#include <linux/clk.h> > +#include <linux/module.h> > +#include <linux/kernel.h> > +#include <linux/interrupt.h> > +#include <linux/platform_device.h> > +#include <linux/dma-mapping.h> > +#include <linux/io.h> > +#include <linux/of_platform.h> > +#include <linux/pm_runtime.h> > + > +/* USB Wrapper register offsets */ > +#define USBSS_PID 0x0 > +#define USBSS_W1 0x4 > +#define USBSS_STATIC_CONFIG 0x8 > +#define USBSS_PHY_TEST 0xc > +#define USBSS_DEBUG_CTRL 0x10 > +#define USBSS_DEBUG_INFO 0x14 > +#define USBSS_DEBUG_LINK_STATE 0x18 > +#define USBSS_DEVICE_CTRL 0x1c > + > +/* Wrapper 1 register bits */ > +#define USBSS_W1_PWRUP_RST BIT(0) > +#define USBSS_W1_OVERCURRENT_SEL BIT(8) > +#define USBSS_W1_MODESTRAP_SEL BIT(9) > +#define USBSS_W1_OVERCURRENT BIT(16) > +#define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17) > +#define USBSS_W1_MODESTRAP_SHIFT 17 > +#define USBSS_W1_USB2_ONLY BIT(19) > + > +/* Static config register bits */ > +#define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5) > +#define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5 > +#define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3) > +#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3 > +#define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1) > +#define USBSS1_STATIC_VBUS_SEL_SHIFT 1 > +#define USBSS1_STATIC_LANE_REVERSE BIT(0) > + > +/* Modestrap modes */ > +enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE, > + USBSS_MODESTRAP_MODE_HOST, > + USBSS_MODESTRAP_MODE_PERIPHERAL}; > + > +struct cdns_ti { > + struct device *dev; > + void __iomem *usbss; > + int usb2_only:1; > + int vbus_divider:1; > + struct clk *usb2_refclk; > + struct clk *lpm_clk; > +}; > + > +static const int cdns_ti_rate_table[] = { /* in KHZ */ > + 9600, > + 10000, > + 12000, > + 19200, > + 20000, > + 24000, > + 25000, > + 26000, > + 38400, > + 40000, > + 58000, > + 50000, > + 52000, > +}; > + > +static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset) > +{ > + return readl(data->usbss + offset); > +} > + > +static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value) > +{ > + writel(value, data->usbss + offset); > +} > + > +static int cdns_ti_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct device_node *node = pdev->dev.of_node; > + struct cdns_ti *data; > + struct resource *res; > + int error; > + u32 reg; > + int rate_code, i; > + unsigned long rate; > + > + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + platform_set_drvdata(pdev, data); > + > + data->dev = dev; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + data->usbss = devm_ioremap_resource(dev, res); > + if (IS_ERR(data->usbss)) > + return PTR_ERR(data->usbss); > + > + data->usb2_refclk = devm_clk_get(dev, "ref"); > + if (IS_ERR(data->usb2_refclk)) { > + dev_err(dev, "can't get usb2_refclk\n"); > + return PTR_ERR(data->usb2_refclk); > + } > + > + data->lpm_clk = devm_clk_get(dev, "lpm"); > + if (IS_ERR(data->lpm_clk)) { > + dev_err(dev, "can't get lpm_clk\n"); > + return PTR_ERR(data->lpm_clk); > + } > + > + rate = clk_get_rate(data->usb2_refclk); > + rate /= 1000; /* To KHz */ > + for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) { > + if (cdns_ti_rate_table[i] == rate) > + break; > + } > + > + if (i == ARRAY_SIZE(cdns_ti_rate_table)) { > + dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate); > + return -EINVAL; > + } > + > + rate_code = i; > + > + pm_runtime_enable(dev); > + error = pm_runtime_get_sync(dev); > + if (error < 0) { > + dev_err(dev, "pm_runtime_get_sync failed: %d\n", error); > + goto err_get; > + } Why you don't enable runtime pm at the end of probe? Peter > + > + /* assert RESET */ > + reg = cdns_ti_readl(data, USBSS_W1); > + reg &= ~USBSS_W1_PWRUP_RST; > + cdns_ti_writel(data, USBSS_W1, reg); > + > + /* set static config */ > + reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); > + reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK; > + reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT; > + > + reg &= ~USBSS1_STATIC_VBUS_SEL_MASK; > + data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider"); > + if (data->vbus_divider) > + reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT; > + > + cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg); > + reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); > + > + /* set USB2_ONLY mode if requested */ > + reg = cdns_ti_readl(data, USBSS_W1); > + data->usb2_only = device_property_read_bool(dev, "ti,usb2-only"); > + if (data->usb2_only) > + reg |= USBSS_W1_USB2_ONLY; > + > + /* set default modestrap */ > + reg |= USBSS_W1_MODESTRAP_SEL; > + reg &= ~USBSS_W1_MODESTRAP_MASK; > + reg |= USBSS_MODESTRAP_MODE_NONE << USBSS_W1_MODESTRAP_SHIFT; > + cdns_ti_writel(data, USBSS_W1, reg); > + > + /* de-assert RESET */ > + reg |= USBSS_W1_PWRUP_RST; > + cdns_ti_writel(data, USBSS_W1, reg); > + > + error = of_platform_populate(node, NULL, NULL, dev); > + if (error) { > + dev_err(dev, "failed to create children: %d\n", error); > + goto err; > + } > + > + return 0; > + > +err: > + pm_runtime_put_sync(data->dev); > +err_get: > + pm_runtime_disable(data->dev); > + > + return error; > +} > + > +static int cdns_ti_remove_core(struct device *dev, void *c) > +{ > + struct platform_device *pdev = to_platform_device(dev); > + > + platform_device_unregister(pdev); > + > + return 0; > +} > + > +static int cdns_ti_remove(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + > + device_for_each_child(dev, NULL, cdns_ti_remove_core); > + pm_runtime_put_sync(dev); > + pm_runtime_disable(dev); > + > + platform_set_drvdata(pdev, NULL); > + > + return 0; > +} > + > +static const struct of_device_id cdns_ti_of_match[] = { > + { .compatible = "ti,j721e-usb", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, cdns_ti_of_match); > + > +static struct platform_driver cdns_ti_driver = { > + .probe = cdns_ti_probe, > + .remove = cdns_ti_remove, > + .driver = { > + .name = "cdns3-ti", > + .of_match_table = cdns_ti_of_match, > + }, > +}; > + > +module_platform_driver(cdns_ti_driver); > + > +MODULE_ALIAS("platform:cdns3-ti"); > +MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>"); > +MODULE_LICENSE("GPL v2"); > +MODULE_DESCRIPTION("Cadence USB3 TI Glue Layer"); > -- > Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. > Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki >
Hi Peter, On 22/10/2019 05:21, Peter Chen wrote: > On 19-10-21 16:13:05, Roger Quadros wrote: >> The J721e platform comes with 2 Cadence USB3 controller >> instances. This driver supports the TI specific wrapper >> on this platform. >> >> Signed-off-by: Roger Quadros <rogerq@ti.com> >> Signed-off-by: Sekhar Nori <nsekhar@ti.com> >> --- >> drivers/usb/cdns3/Kconfig | 10 ++ >> drivers/usb/cdns3/Makefile | 1 + >> drivers/usb/cdns3/cdns3-ti.c | 236 +++++++++++++++++++++++++++++++++++ >> 3 files changed, 247 insertions(+) >> create mode 100644 drivers/usb/cdns3/cdns3-ti.c >> >> diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig >> index d0331613a355..2a1e89d12ed9 100644 >> --- a/drivers/usb/cdns3/Kconfig >> +++ b/drivers/usb/cdns3/Kconfig >> @@ -43,4 +43,14 @@ config USB_CDNS3_PCI_WRAP >> If you choose to build this driver as module it will >> be dynamically linked and module will be called cdns3-pci.ko >> >> +config USB_CDNS3_TI >> + tristate "Cadence USB3 support on TI platforms" >> + depends on ARCH_K3 || COMPILE_TEST >> + default USB_CDNS3 >> + help >> + Say 'Y' or 'M' here if you are building for Texas Instruments >> + platforms that contain Cadence USB3 controller core. >> + >> + e.g. J721e. >> + >> endif >> diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile >> index a703547350bb..948e6b88d1a9 100644 >> --- a/drivers/usb/cdns3/Makefile >> +++ b/drivers/usb/cdns3/Makefile >> @@ -14,3 +14,4 @@ endif >> cdns3-$(CONFIG_USB_CDNS3_HOST) += host.o >> >> obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci-wrap.o >> +obj-$(CONFIG_USB_CDNS3_TI) += cdns3-ti.o >> diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c >> new file mode 100644 >> index 000000000000..5541cba71965 >> --- /dev/null >> +++ b/drivers/usb/cdns3/cdns3-ti.c >> @@ -0,0 +1,236 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +/** >> + * cdns_ti-ti.c - TI specific Glue layer for Cadence USB Controller > > cdns3-ti.c > >> + * >> + * Copyright (C) 2019 Texas Instruments Incorporated - https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ti.com&data=02%7C01%7Cpeter.chen%40nxp.com%7C94aad23d5a294c5cdaf808d75628931c%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637072604595033025&sdata=Lye5SayAKcqAMaNGbZ%2Fq5OkUZ8IsWMVgGmeh8IhA69M%3D&reserved=0 >> + */ >> + >> +#include <linux/bits.h> >> +#include <linux/clk.h> >> +#include <linux/module.h> >> +#include <linux/kernel.h> >> +#include <linux/interrupt.h> >> +#include <linux/platform_device.h> >> +#include <linux/dma-mapping.h> >> +#include <linux/io.h> >> +#include <linux/of_platform.h> >> +#include <linux/pm_runtime.h> >> + >> +/* USB Wrapper register offsets */ >> +#define USBSS_PID 0x0 >> +#define USBSS_W1 0x4 >> +#define USBSS_STATIC_CONFIG 0x8 >> +#define USBSS_PHY_TEST 0xc >> +#define USBSS_DEBUG_CTRL 0x10 >> +#define USBSS_DEBUG_INFO 0x14 >> +#define USBSS_DEBUG_LINK_STATE 0x18 >> +#define USBSS_DEVICE_CTRL 0x1c >> + >> +/* Wrapper 1 register bits */ >> +#define USBSS_W1_PWRUP_RST BIT(0) >> +#define USBSS_W1_OVERCURRENT_SEL BIT(8) >> +#define USBSS_W1_MODESTRAP_SEL BIT(9) >> +#define USBSS_W1_OVERCURRENT BIT(16) >> +#define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17) >> +#define USBSS_W1_MODESTRAP_SHIFT 17 >> +#define USBSS_W1_USB2_ONLY BIT(19) >> + >> +/* Static config register bits */ >> +#define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5) >> +#define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5 >> +#define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3) >> +#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3 >> +#define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1) >> +#define USBSS1_STATIC_VBUS_SEL_SHIFT 1 >> +#define USBSS1_STATIC_LANE_REVERSE BIT(0) >> + >> +/* Modestrap modes */ >> +enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE, >> + USBSS_MODESTRAP_MODE_HOST, >> + USBSS_MODESTRAP_MODE_PERIPHERAL}; >> + >> +struct cdns_ti { >> + struct device *dev; >> + void __iomem *usbss; >> + int usb2_only:1; >> + int vbus_divider:1; >> + struct clk *usb2_refclk; >> + struct clk *lpm_clk; >> +}; >> + >> +static const int cdns_ti_rate_table[] = { /* in KHZ */ >> + 9600, >> + 10000, >> + 12000, >> + 19200, >> + 20000, >> + 24000, >> + 25000, >> + 26000, >> + 38400, >> + 40000, >> + 58000, >> + 50000, >> + 52000, >> +}; >> + >> +static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset) >> +{ >> + return readl(data->usbss + offset); >> +} >> + >> +static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value) >> +{ >> + writel(value, data->usbss + offset); >> +} >> + >> +static int cdns_ti_probe(struct platform_device *pdev) >> +{ >> + struct device *dev = &pdev->dev; >> + struct device_node *node = pdev->dev.of_node; >> + struct cdns_ti *data; >> + struct resource *res; >> + int error; >> + u32 reg; >> + int rate_code, i; >> + unsigned long rate; >> + >> + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); >> + if (!data) >> + return -ENOMEM; >> + >> + platform_set_drvdata(pdev, data); >> + >> + data->dev = dev; >> + >> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); >> + data->usbss = devm_ioremap_resource(dev, res); >> + if (IS_ERR(data->usbss)) >> + return PTR_ERR(data->usbss); >> + >> + data->usb2_refclk = devm_clk_get(dev, "ref"); >> + if (IS_ERR(data->usb2_refclk)) { >> + dev_err(dev, "can't get usb2_refclk\n"); >> + return PTR_ERR(data->usb2_refclk); >> + } >> + >> + data->lpm_clk = devm_clk_get(dev, "lpm"); >> + if (IS_ERR(data->lpm_clk)) { >> + dev_err(dev, "can't get lpm_clk\n"); >> + return PTR_ERR(data->lpm_clk); >> + } >> + >> + rate = clk_get_rate(data->usb2_refclk); >> + rate /= 1000; /* To KHz */ >> + for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) { >> + if (cdns_ti_rate_table[i] == rate) >> + break; >> + } >> + >> + if (i == ARRAY_SIZE(cdns_ti_rate_table)) { >> + dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate); >> + return -EINVAL; >> + } >> + >> + rate_code = i; >> + >> + pm_runtime_enable(dev); >> + error = pm_runtime_get_sync(dev); >> + if (error < 0) { >> + dev_err(dev, "pm_runtime_get_sync failed: %d\n", error); >> + goto err_get; >> + } > > Why you don't enable runtime pm at the end of probe? Because on our platform that is required to enable the module before the registers can be read. cheers, -roger > > Peter > >> + >> + /* assert RESET */ >> + reg = cdns_ti_readl(data, USBSS_W1); >> + reg &= ~USBSS_W1_PWRUP_RST; >> + cdns_ti_writel(data, USBSS_W1, reg); >> + >> + /* set static config */ >> + reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); >> + reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK; >> + reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT; >> + >> + reg &= ~USBSS1_STATIC_VBUS_SEL_MASK; >> + data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider"); >> + if (data->vbus_divider) >> + reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT; >> + >> + cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg); >> + reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); >> + >> + /* set USB2_ONLY mode if requested */ >> + reg = cdns_ti_readl(data, USBSS_W1); >> + data->usb2_only = device_property_read_bool(dev, "ti,usb2-only"); >> + if (data->usb2_only) >> + reg |= USBSS_W1_USB2_ONLY; >> + >> + /* set default modestrap */ >> + reg |= USBSS_W1_MODESTRAP_SEL; >> + reg &= ~USBSS_W1_MODESTRAP_MASK; >> + reg |= USBSS_MODESTRAP_MODE_NONE << USBSS_W1_MODESTRAP_SHIFT; >> + cdns_ti_writel(data, USBSS_W1, reg); >> + >> + /* de-assert RESET */ >> + reg |= USBSS_W1_PWRUP_RST; >> + cdns_ti_writel(data, USBSS_W1, reg); >> + >> + error = of_platform_populate(node, NULL, NULL, dev); >> + if (error) { >> + dev_err(dev, "failed to create children: %d\n", error); >> + goto err; >> + } >> + >> + return 0; >> + >> +err: >> + pm_runtime_put_sync(data->dev); >> +err_get: >> + pm_runtime_disable(data->dev); >> + >> + return error; >> +} >> + >> +static int cdns_ti_remove_core(struct device *dev, void *c) >> +{ >> + struct platform_device *pdev = to_platform_device(dev); >> + >> + platform_device_unregister(pdev); >> + >> + return 0; >> +} >> + >> +static int cdns_ti_remove(struct platform_device *pdev) >> +{ >> + struct device *dev = &pdev->dev; >> + >> + device_for_each_child(dev, NULL, cdns_ti_remove_core); >> + pm_runtime_put_sync(dev); >> + pm_runtime_disable(dev); >> + >> + platform_set_drvdata(pdev, NULL); >> + >> + return 0; >> +} >> + >> +static const struct of_device_id cdns_ti_of_match[] = { >> + { .compatible = "ti,j721e-usb", }, >> + {}, >> +}; >> +MODULE_DEVICE_TABLE(of, cdns_ti_of_match); >> + >> +static struct platform_driver cdns_ti_driver = { >> + .probe = cdns_ti_probe, >> + .remove = cdns_ti_remove, >> + .driver = { >> + .name = "cdns3-ti", >> + .of_match_table = cdns_ti_of_match, >> + }, >> +}; >> + >> +module_platform_driver(cdns_ti_driver); >> + >> +MODULE_ALIAS("platform:cdns3-ti"); >> +MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>"); >> +MODULE_LICENSE("GPL v2"); >> +MODULE_DESCRIPTION("Cadence USB3 TI Glue Layer"); >> -- >> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. >> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki >> >
diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig index d0331613a355..2a1e89d12ed9 100644 --- a/drivers/usb/cdns3/Kconfig +++ b/drivers/usb/cdns3/Kconfig @@ -43,4 +43,14 @@ config USB_CDNS3_PCI_WRAP If you choose to build this driver as module it will be dynamically linked and module will be called cdns3-pci.ko +config USB_CDNS3_TI + tristate "Cadence USB3 support on TI platforms" + depends on ARCH_K3 || COMPILE_TEST + default USB_CDNS3 + help + Say 'Y' or 'M' here if you are building for Texas Instruments + platforms that contain Cadence USB3 controller core. + + e.g. J721e. + endif diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile index a703547350bb..948e6b88d1a9 100644 --- a/drivers/usb/cdns3/Makefile +++ b/drivers/usb/cdns3/Makefile @@ -14,3 +14,4 @@ endif cdns3-$(CONFIG_USB_CDNS3_HOST) += host.o obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci-wrap.o +obj-$(CONFIG_USB_CDNS3_TI) += cdns3-ti.o diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c new file mode 100644 index 000000000000..5541cba71965 --- /dev/null +++ b/drivers/usb/cdns3/cdns3-ti.c @@ -0,0 +1,236 @@ +// SPDX-License-Identifier: GPL-2.0 +/** + * cdns_ti-ti.c - TI specific Glue layer for Cadence USB Controller + * + * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com + */ + +#include <linux/bits.h> +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/dma-mapping.h> +#include <linux/io.h> +#include <linux/of_platform.h> +#include <linux/pm_runtime.h> + +/* USB Wrapper register offsets */ +#define USBSS_PID 0x0 +#define USBSS_W1 0x4 +#define USBSS_STATIC_CONFIG 0x8 +#define USBSS_PHY_TEST 0xc +#define USBSS_DEBUG_CTRL 0x10 +#define USBSS_DEBUG_INFO 0x14 +#define USBSS_DEBUG_LINK_STATE 0x18 +#define USBSS_DEVICE_CTRL 0x1c + +/* Wrapper 1 register bits */ +#define USBSS_W1_PWRUP_RST BIT(0) +#define USBSS_W1_OVERCURRENT_SEL BIT(8) +#define USBSS_W1_MODESTRAP_SEL BIT(9) +#define USBSS_W1_OVERCURRENT BIT(16) +#define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17) +#define USBSS_W1_MODESTRAP_SHIFT 17 +#define USBSS_W1_USB2_ONLY BIT(19) + +/* Static config register bits */ +#define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5) +#define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5 +#define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3) +#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3 +#define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1) +#define USBSS1_STATIC_VBUS_SEL_SHIFT 1 +#define USBSS1_STATIC_LANE_REVERSE BIT(0) + +/* Modestrap modes */ +enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE, + USBSS_MODESTRAP_MODE_HOST, + USBSS_MODESTRAP_MODE_PERIPHERAL}; + +struct cdns_ti { + struct device *dev; + void __iomem *usbss; + int usb2_only:1; + int vbus_divider:1; + struct clk *usb2_refclk; + struct clk *lpm_clk; +}; + +static const int cdns_ti_rate_table[] = { /* in KHZ */ + 9600, + 10000, + 12000, + 19200, + 20000, + 24000, + 25000, + 26000, + 38400, + 40000, + 58000, + 50000, + 52000, +}; + +static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset) +{ + return readl(data->usbss + offset); +} + +static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value) +{ + writel(value, data->usbss + offset); +} + +static int cdns_ti_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *node = pdev->dev.of_node; + struct cdns_ti *data; + struct resource *res; + int error; + u32 reg; + int rate_code, i; + unsigned long rate; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + platform_set_drvdata(pdev, data); + + data->dev = dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->usbss = devm_ioremap_resource(dev, res); + if (IS_ERR(data->usbss)) + return PTR_ERR(data->usbss); + + data->usb2_refclk = devm_clk_get(dev, "ref"); + if (IS_ERR(data->usb2_refclk)) { + dev_err(dev, "can't get usb2_refclk\n"); + return PTR_ERR(data->usb2_refclk); + } + + data->lpm_clk = devm_clk_get(dev, "lpm"); + if (IS_ERR(data->lpm_clk)) { + dev_err(dev, "can't get lpm_clk\n"); + return PTR_ERR(data->lpm_clk); + } + + rate = clk_get_rate(data->usb2_refclk); + rate /= 1000; /* To KHz */ + for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) { + if (cdns_ti_rate_table[i] == rate) + break; + } + + if (i == ARRAY_SIZE(cdns_ti_rate_table)) { + dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate); + return -EINVAL; + } + + rate_code = i; + + pm_runtime_enable(dev); + error = pm_runtime_get_sync(dev); + if (error < 0) { + dev_err(dev, "pm_runtime_get_sync failed: %d\n", error); + goto err_get; + } + + /* assert RESET */ + reg = cdns_ti_readl(data, USBSS_W1); + reg &= ~USBSS_W1_PWRUP_RST; + cdns_ti_writel(data, USBSS_W1, reg); + + /* set static config */ + reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); + reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK; + reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT; + + reg &= ~USBSS1_STATIC_VBUS_SEL_MASK; + data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider"); + if (data->vbus_divider) + reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT; + + cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg); + reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG); + + /* set USB2_ONLY mode if requested */ + reg = cdns_ti_readl(data, USBSS_W1); + data->usb2_only = device_property_read_bool(dev, "ti,usb2-only"); + if (data->usb2_only) + reg |= USBSS_W1_USB2_ONLY; + + /* set default modestrap */ + reg |= USBSS_W1_MODESTRAP_SEL; + reg &= ~USBSS_W1_MODESTRAP_MASK; + reg |= USBSS_MODESTRAP_MODE_NONE << USBSS_W1_MODESTRAP_SHIFT; + cdns_ti_writel(data, USBSS_W1, reg); + + /* de-assert RESET */ + reg |= USBSS_W1_PWRUP_RST; + cdns_ti_writel(data, USBSS_W1, reg); + + error = of_platform_populate(node, NULL, NULL, dev); + if (error) { + dev_err(dev, "failed to create children: %d\n", error); + goto err; + } + + return 0; + +err: + pm_runtime_put_sync(data->dev); +err_get: + pm_runtime_disable(data->dev); + + return error; +} + +static int cdns_ti_remove_core(struct device *dev, void *c) +{ + struct platform_device *pdev = to_platform_device(dev); + + platform_device_unregister(pdev); + + return 0; +} + +static int cdns_ti_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + + device_for_each_child(dev, NULL, cdns_ti_remove_core); + pm_runtime_put_sync(dev); + pm_runtime_disable(dev); + + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static const struct of_device_id cdns_ti_of_match[] = { + { .compatible = "ti,j721e-usb", }, + {}, +}; +MODULE_DEVICE_TABLE(of, cdns_ti_of_match); + +static struct platform_driver cdns_ti_driver = { + .probe = cdns_ti_probe, + .remove = cdns_ti_remove, + .driver = { + .name = "cdns3-ti", + .of_match_table = cdns_ti_of_match, + }, +}; + +module_platform_driver(cdns_ti_driver); + +MODULE_ALIAS("platform:cdns3-ti"); +MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Cadence USB3 TI Glue Layer");