forked from luck/tmp_suning_uos_patched
usb: cdns3: Add TI specific wrapper driver
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> Reviewed-by: Pawel Laszczak <pawell@cadence.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Roger Quadros
Felipe Balbi
parent
4c48f23678
commit
387c359b84
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@ -43,4 +43,14 @@ config USB_CDNS3_PCI_WRAP
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If you choose to build this driver as module it will
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be dynamically linked and module will be called cdns3-pci.ko
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config USB_CDNS3_TI
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tristate "Cadence USB3 support on TI platforms"
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depends on ARCH_K3 || COMPILE_TEST
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default USB_CDNS3
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help
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Say 'Y' or 'M' here if you are building for Texas Instruments
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platforms that contain Cadence USB3 controller core.
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e.g. J721e.
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endif
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@ -14,3 +14,4 @@ endif
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cdns3-$(CONFIG_USB_CDNS3_HOST) += host.o
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obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci-wrap.o
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obj-$(CONFIG_USB_CDNS3_TI) += cdns3-ti.o
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236
drivers/usb/cdns3/cdns3-ti.c
Normal file
236
drivers/usb/cdns3/cdns3-ti.c
Normal file
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@ -0,0 +1,236 @@
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// SPDX-License-Identifier: GPL-2.0
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/**
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* cdns3-ti.c - TI specific Glue layer for Cadence USB Controller
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*
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* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
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*/
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#include <linux/bits.h>
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/io.h>
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#include <linux/of_platform.h>
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#include <linux/pm_runtime.h>
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/* USB Wrapper register offsets */
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#define USBSS_PID 0x0
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#define USBSS_W1 0x4
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#define USBSS_STATIC_CONFIG 0x8
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#define USBSS_PHY_TEST 0xc
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#define USBSS_DEBUG_CTRL 0x10
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#define USBSS_DEBUG_INFO 0x14
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#define USBSS_DEBUG_LINK_STATE 0x18
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#define USBSS_DEVICE_CTRL 0x1c
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/* Wrapper 1 register bits */
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#define USBSS_W1_PWRUP_RST BIT(0)
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#define USBSS_W1_OVERCURRENT_SEL BIT(8)
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#define USBSS_W1_MODESTRAP_SEL BIT(9)
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#define USBSS_W1_OVERCURRENT BIT(16)
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#define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17)
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#define USBSS_W1_MODESTRAP_SHIFT 17
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#define USBSS_W1_USB2_ONLY BIT(19)
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/* Static config register bits */
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#define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5)
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#define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5
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#define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3)
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#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3
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#define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1)
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#define USBSS1_STATIC_VBUS_SEL_SHIFT 1
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#define USBSS1_STATIC_LANE_REVERSE BIT(0)
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/* Modestrap modes */
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enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE,
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USBSS_MODESTRAP_MODE_HOST,
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USBSS_MODESTRAP_MODE_PERIPHERAL};
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struct cdns_ti {
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struct device *dev;
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void __iomem *usbss;
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int usb2_only:1;
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int vbus_divider:1;
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struct clk *usb2_refclk;
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struct clk *lpm_clk;
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};
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static const int cdns_ti_rate_table[] = { /* in KHZ */
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9600,
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10000,
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12000,
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19200,
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20000,
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24000,
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25000,
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26000,
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38400,
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40000,
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58000,
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50000,
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52000,
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};
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static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset)
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{
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return readl(data->usbss + offset);
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}
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static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value)
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{
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writel(value, data->usbss + offset);
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}
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static int cdns_ti_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *node = pdev->dev.of_node;
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struct cdns_ti *data;
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int error;
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u32 reg;
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int rate_code, i;
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unsigned long rate;
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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platform_set_drvdata(pdev, data);
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data->dev = dev;
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data->usbss = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(data->usbss)) {
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dev_err(dev, "can't map IOMEM resource\n");
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return PTR_ERR(data->usbss);
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}
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data->usb2_refclk = devm_clk_get(dev, "ref");
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if (IS_ERR(data->usb2_refclk)) {
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dev_err(dev, "can't get usb2_refclk\n");
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return PTR_ERR(data->usb2_refclk);
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}
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data->lpm_clk = devm_clk_get(dev, "lpm");
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if (IS_ERR(data->lpm_clk)) {
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dev_err(dev, "can't get lpm_clk\n");
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return PTR_ERR(data->lpm_clk);
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}
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rate = clk_get_rate(data->usb2_refclk);
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rate /= 1000; /* To KHz */
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for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) {
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if (cdns_ti_rate_table[i] == rate)
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break;
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}
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if (i == ARRAY_SIZE(cdns_ti_rate_table)) {
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dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate);
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return -EINVAL;
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}
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rate_code = i;
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pm_runtime_enable(dev);
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error = pm_runtime_get_sync(dev);
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if (error < 0) {
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dev_err(dev, "pm_runtime_get_sync failed: %d\n", error);
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goto err_get;
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}
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/* assert RESET */
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reg = cdns_ti_readl(data, USBSS_W1);
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reg &= ~USBSS_W1_PWRUP_RST;
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cdns_ti_writel(data, USBSS_W1, reg);
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/* set static config */
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reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
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reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK;
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reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT;
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reg &= ~USBSS1_STATIC_VBUS_SEL_MASK;
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data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");
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if (data->vbus_divider)
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reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT;
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cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg);
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reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
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/* set USB2_ONLY mode if requested */
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reg = cdns_ti_readl(data, USBSS_W1);
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data->usb2_only = device_property_read_bool(dev, "ti,usb2-only");
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if (data->usb2_only)
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reg |= USBSS_W1_USB2_ONLY;
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/* set default modestrap */
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reg |= USBSS_W1_MODESTRAP_SEL;
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reg &= ~USBSS_W1_MODESTRAP_MASK;
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reg |= USBSS_MODESTRAP_MODE_NONE << USBSS_W1_MODESTRAP_SHIFT;
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cdns_ti_writel(data, USBSS_W1, reg);
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/* de-assert RESET */
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reg |= USBSS_W1_PWRUP_RST;
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cdns_ti_writel(data, USBSS_W1, reg);
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error = of_platform_populate(node, NULL, NULL, dev);
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if (error) {
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dev_err(dev, "failed to create children: %d\n", error);
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goto err;
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}
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return 0;
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err:
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pm_runtime_put_sync(data->dev);
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err_get:
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pm_runtime_disable(data->dev);
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return error;
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}
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static int cdns_ti_remove_core(struct device *dev, void *c)
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{
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struct platform_device *pdev = to_platform_device(dev);
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platform_device_unregister(pdev);
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return 0;
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}
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static int cdns_ti_remove(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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device_for_each_child(dev, NULL, cdns_ti_remove_core);
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pm_runtime_put_sync(dev);
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pm_runtime_disable(dev);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static const struct of_device_id cdns_ti_of_match[] = {
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{ .compatible = "ti,j721e-usb", },
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{},
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};
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MODULE_DEVICE_TABLE(of, cdns_ti_of_match);
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static struct platform_driver cdns_ti_driver = {
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.probe = cdns_ti_probe,
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.remove = cdns_ti_remove,
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.driver = {
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.name = "cdns3-ti",
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.of_match_table = cdns_ti_of_match,
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},
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};
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module_platform_driver(cdns_ti_driver);
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MODULE_ALIAS("platform:cdns3-ti");
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MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Cadence USB3 TI Glue Layer");
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