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131 lines
3.3 KiB
131 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Broadcom Northstar USB 2.0 PHY Driver |
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* |
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* Copyright (C) 2016 Rafał Miłecki <[email protected]> |
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*/ |
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#include <linux/bcma/bcma.h> |
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#include <linux/clk.h> |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/module.h> |
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#include <linux/of_address.h> |
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#include <linux/of_platform.h> |
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#include <linux/phy/phy.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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struct bcm_ns_usb2 { |
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struct device *dev; |
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struct clk *ref_clk; |
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struct phy *phy; |
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void __iomem *dmu; |
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}; |
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static int bcm_ns_usb2_phy_init(struct phy *phy) |
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{ |
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struct bcm_ns_usb2 *usb2 = phy_get_drvdata(phy); |
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struct device *dev = usb2->dev; |
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void __iomem *dmu = usb2->dmu; |
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u32 ref_clk_rate, usb2ctl, usb_pll_ndiv, usb_pll_pdiv; |
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int err = 0; |
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err = clk_prepare_enable(usb2->ref_clk); |
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if (err < 0) { |
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dev_err(dev, "Failed to prepare ref clock: %d\n", err); |
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goto err_out; |
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} |
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ref_clk_rate = clk_get_rate(usb2->ref_clk); |
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if (!ref_clk_rate) { |
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dev_err(dev, "Failed to get ref clock rate\n"); |
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err = -EINVAL; |
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goto err_clk_off; |
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} |
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usb2ctl = readl(dmu + BCMA_DMU_CRU_USB2_CONTROL); |
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if (usb2ctl & BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK) { |
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usb_pll_pdiv = usb2ctl; |
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usb_pll_pdiv &= BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK; |
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usb_pll_pdiv >>= BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_SHIFT; |
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} else { |
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usb_pll_pdiv = 1 << 3; |
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} |
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/* Calculate ndiv based on a solid 1920 MHz that is for USB2 PHY */ |
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usb_pll_ndiv = (1920000000 * usb_pll_pdiv) / ref_clk_rate; |
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/* Unlock DMU PLL settings with some magic value */ |
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writel(0x0000ea68, dmu + BCMA_DMU_CRU_CLKSET_KEY); |
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/* Write USB 2.0 PLL control setting */ |
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usb2ctl &= ~BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_MASK; |
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usb2ctl |= usb_pll_ndiv << BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_SHIFT; |
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writel(usb2ctl, dmu + BCMA_DMU_CRU_USB2_CONTROL); |
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/* Lock DMU PLL settings */ |
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writel(0x00000000, dmu + BCMA_DMU_CRU_CLKSET_KEY); |
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err_clk_off: |
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clk_disable_unprepare(usb2->ref_clk); |
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err_out: |
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return err; |
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} |
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static const struct phy_ops ops = { |
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.init = bcm_ns_usb2_phy_init, |
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.owner = THIS_MODULE, |
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}; |
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static int bcm_ns_usb2_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct bcm_ns_usb2 *usb2; |
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struct phy_provider *phy_provider; |
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usb2 = devm_kzalloc(&pdev->dev, sizeof(*usb2), GFP_KERNEL); |
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if (!usb2) |
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return -ENOMEM; |
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usb2->dev = dev; |
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usb2->dmu = devm_platform_ioremap_resource_byname(pdev, "dmu"); |
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if (IS_ERR(usb2->dmu)) { |
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dev_err(dev, "Failed to map DMU regs\n"); |
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return PTR_ERR(usb2->dmu); |
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} |
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usb2->ref_clk = devm_clk_get(dev, "phy-ref-clk"); |
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if (IS_ERR(usb2->ref_clk)) { |
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dev_err(dev, "Clock not defined\n"); |
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return PTR_ERR(usb2->ref_clk); |
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} |
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usb2->phy = devm_phy_create(dev, NULL, &ops); |
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if (IS_ERR(usb2->phy)) |
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return PTR_ERR(usb2->phy); |
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phy_set_drvdata(usb2->phy, usb2); |
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platform_set_drvdata(pdev, usb2); |
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phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); |
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return PTR_ERR_OR_ZERO(phy_provider); |
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} |
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static const struct of_device_id bcm_ns_usb2_id_table[] = { |
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{ .compatible = "brcm,ns-usb2-phy", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, bcm_ns_usb2_id_table); |
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static struct platform_driver bcm_ns_usb2_driver = { |
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.probe = bcm_ns_usb2_probe, |
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.driver = { |
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.name = "bcm_ns_usb2", |
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.of_match_table = bcm_ns_usb2_id_table, |
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}, |
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}; |
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module_platform_driver(bcm_ns_usb2_driver); |
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MODULE_LICENSE("GPL v2");
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