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