diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/usb/cdns3/cdns3-ti.c | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c new file mode 100644 index 000000000..90e246601 --- /dev/null +++ b/drivers/usb/cdns3/cdns3-ti.c @@ -0,0 +1,235 @@ +// SPDX-License-Identifier: GPL-2.0 +/** + * cdns3-ti.c - TI specific Glue layer for Cadence USB Controller + * + * Copyright (C) 2019 Texas Instruments Incorporated - https://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; + unsigned usb2_only:1; + unsigned 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; + 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; + + data->usbss = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(data->usbss)) { + dev_err(dev, "can't map IOMEM resource\n"); + 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; + } + + /* 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); + 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"); |