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drivers/phy/ti/phy-dm816x-usb.c
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/* * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation version 2. * * This program is distributed "as is" WITHOUT ANY WARRANTY of any * kind, whether express or implied; 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/platform_device.h> #include <linux/regmap.h> #include <linux/slab.h> #include <linux/of.h> #include <linux/io.h> #include <linux/usb/phy_companion.h> #include <linux/clk.h> #include <linux/err.h> #include <linux/pm_runtime.h> #include <linux/delay.h> #include <linux/phy/phy.h> #include <linux/of_platform.h> #include <linux/mfd/syscon.h> /* * TRM has two sets of USB_CTRL registers.. The correct register bits * are in TRM section 24.9.8.2 USB_CTRL Register. The TRM documents the * phy as being SR70LX Synopsys USB 2.0 OTG nanoPHY. It also seems at * least dm816x rev c ignores writes to USB_CTRL register, but the TI * kernel is writing to those so it's possible that later revisions * have worknig USB_CTRL register. * * Also note that At least USB_CTRL register seems to be dm816x specific * according to the TRM. It's possible that USBPHY_CTRL is more generic, * but that would have to be checked against the SR70LX documentation * which does not seem to be publicly available. * * Finally, the phy on dm814x and am335x is different from dm816x. */ #define DM816X_USB_CTRL_PHYCLKSRC BIT(8) /* 1 = PLL ref clock */ #define DM816X_USB_CTRL_PHYSLEEP1 BIT(1) /* Enable the first phy */ #define DM816X_USB_CTRL_PHYSLEEP0 BIT(0) /* Enable the second phy */ #define DM816X_USBPHY_CTRL_TXRISETUNE 1 #define DM816X_USBPHY_CTRL_TXVREFTUNE 0xc #define DM816X_USBPHY_CTRL_TXPREEMTUNE 0x2 struct dm816x_usb_phy { struct regmap *syscon; struct device *dev; unsigned int instance; struct clk *refclk; struct usb_phy phy; unsigned int usb_ctrl; /* Shared between phy0 and phy1 */ unsigned int usbphy_ctrl; }; static int dm816x_usb_phy_set_host(struct usb_otg *otg, struct usb_bus *host) { otg->host = host; if (!host) otg->state = OTG_STATE_UNDEFINED; return 0; } static int dm816x_usb_phy_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget) { otg->gadget = gadget; if (!gadget) otg->state = OTG_STATE_UNDEFINED; return 0; } static int dm816x_usb_phy_init(struct phy *x) { struct dm816x_usb_phy *phy = phy_get_drvdata(x); unsigned int val; int error; if (clk_get_rate(phy->refclk) != 24000000) dev_warn(phy->dev, "nonstandard phy refclk "); /* Set PLL ref clock and put phys to sleep */ error = regmap_update_bits(phy->syscon, phy->usb_ctrl, DM816X_USB_CTRL_PHYCLKSRC | DM816X_USB_CTRL_PHYSLEEP1 | DM816X_USB_CTRL_PHYSLEEP0, 0); regmap_read(phy->syscon, phy->usb_ctrl, &val); if ((val & 3) != 0) dev_info(phy->dev, "Working dm816x USB_CTRL! (0x%08x) ", val); /* * TI kernel sets these values for "symmetrical eye diagram and * better signal quality" so let's assume somebody checked the * values with a scope and set them here too. */ regmap_read(phy->syscon, phy->usbphy_ctrl, &val); val |= DM816X_USBPHY_CTRL_TXRISETUNE | DM816X_USBPHY_CTRL_TXVREFTUNE | DM816X_USBPHY_CTRL_TXPREEMTUNE; regmap_write(phy->syscon, phy->usbphy_ctrl, val); return 0; } |
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static const struct phy_ops ops = { |
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.init = dm816x_usb_phy_init, .owner = THIS_MODULE, }; |
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static int __maybe_unused dm816x_usb_phy_runtime_suspend(struct device *dev) |
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{ struct dm816x_usb_phy *phy = dev_get_drvdata(dev); unsigned int mask, val; int error = 0; mask = BIT(phy->instance); val = ~BIT(phy->instance); error = regmap_update_bits(phy->syscon, phy->usb_ctrl, mask, val); if (error) dev_err(phy->dev, "phy%i failed to power off ", phy->instance); clk_disable(phy->refclk); return 0; } |
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static int __maybe_unused dm816x_usb_phy_runtime_resume(struct device *dev) |
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{ struct dm816x_usb_phy *phy = dev_get_drvdata(dev); unsigned int mask, val; int error; error = clk_enable(phy->refclk); if (error) return error; /* * Note that at least dm816x rev c does not seem to do * anything with the USB_CTRL register. But let's follow * what the TI tree is doing in case later revisions use * USB_CTRL. */ mask = BIT(phy->instance); val = BIT(phy->instance); error = regmap_update_bits(phy->syscon, phy->usb_ctrl, mask, val); if (error) { dev_err(phy->dev, "phy%i failed to power on ", phy->instance); clk_disable(phy->refclk); return error; } return 0; } static UNIVERSAL_DEV_PM_OPS(dm816x_usb_phy_pm_ops, dm816x_usb_phy_runtime_suspend, dm816x_usb_phy_runtime_resume, NULL); #ifdef CONFIG_OF static const struct of_device_id dm816x_usb_phy_id_table[] = { { .compatible = "ti,dm8168-usb-phy", }, {}, }; MODULE_DEVICE_TABLE(of, dm816x_usb_phy_id_table); #endif static int dm816x_usb_phy_probe(struct platform_device *pdev) { struct dm816x_usb_phy *phy; struct resource *res; struct phy *generic_phy; struct phy_provider *phy_provider; struct usb_otg *otg; const struct of_device_id *of_id; |
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int error; of_id = of_match_device(of_match_ptr(dm816x_usb_phy_id_table), &pdev->dev); if (!of_id) return -EINVAL; phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL); if (!phy) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENOENT; phy->syscon = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "syscon"); if (IS_ERR(phy->syscon)) return PTR_ERR(phy->syscon); /* * According to sprs614e.pdf, the first usb_ctrl is shared and * the second instance for usb_ctrl is reserved.. Also the * register bits are different from earlier TRMs. */ phy->usb_ctrl = 0x20; phy->usbphy_ctrl = (res->start & 0xff) + 4; if (phy->usbphy_ctrl == 0x2c) phy->instance = 1; |
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otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL); if (!otg) return -ENOMEM; phy->dev = &pdev->dev; phy->phy.dev = phy->dev; phy->phy.label = "dm8168_usb_phy"; phy->phy.otg = otg; phy->phy.type = USB_PHY_TYPE_USB2; otg->set_host = dm816x_usb_phy_set_host; otg->set_peripheral = dm816x_usb_phy_set_peripheral; otg->usb_phy = &phy->phy; platform_set_drvdata(pdev, phy); phy->refclk = devm_clk_get(phy->dev, "refclk"); if (IS_ERR(phy->refclk)) return PTR_ERR(phy->refclk); error = clk_prepare(phy->refclk); if (error) return error; pm_runtime_enable(phy->dev); generic_phy = devm_phy_create(phy->dev, NULL, &ops); if (IS_ERR(generic_phy)) return PTR_ERR(generic_phy); phy_set_drvdata(generic_phy, phy); phy_provider = devm_of_phy_provider_register(phy->dev, of_phy_simple_xlate); if (IS_ERR(phy_provider)) return PTR_ERR(phy_provider); usb_add_phy_dev(&phy->phy); return 0; } static int dm816x_usb_phy_remove(struct platform_device *pdev) { struct dm816x_usb_phy *phy = platform_get_drvdata(pdev); usb_remove_phy(&phy->phy); pm_runtime_disable(phy->dev); clk_unprepare(phy->refclk); return 0; } static struct platform_driver dm816x_usb_phy_driver = { .probe = dm816x_usb_phy_probe, .remove = dm816x_usb_phy_remove, .driver = { .name = "dm816x-usb-phy", .pm = &dm816x_usb_phy_pm_ops, .of_match_table = of_match_ptr(dm816x_usb_phy_id_table), }, }; module_platform_driver(dm816x_usb_phy_driver); MODULE_ALIAS("platform:dm816x_usb"); MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); MODULE_DESCRIPTION("dm816x usb phy driver"); MODULE_LICENSE("GPL v2"); |