git.openwrt.org Git - openwrt/staging/dangole.git/blob

   1 From d3feb406733544dbf0e239ef945a09decdceac88 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
   3 Date: Thu, 14 Apr 2016 11:37:43 +0200
   4 Subject: [PATCH] phy: bcm-ns-usb2: new driver for USB 2.0 PHY on Northstar
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Northstar is a family of SoCs used in home routers. They have USB 2.0
  10 and 3.0 controllers with PHYs that need to be properly initialized.
  11 This driver provides PHY init support in a generic way and can be bound
  12 with an EHCI controller driver.
  13 There are (just a few) registers being defined in bcma header. It's
  14 because DMU/CRU registers will be also needed in other drivers. We will
  15 need them e.g. in PCIe controller/PHY driver and at some point probably
  16 in clock driver for BCM53573 chipset. By using include/linux/bcma/ we
  17 avoid code duplication.
  18
  19 Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
  20 Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
  21 ---
  22  .../devicetree/bindings/phy/bcm-ns-usb2-phy.txt    |  21 ++++
  23  drivers/phy/Kconfig                                |   9 ++
  24  drivers/phy/Makefile                               |   1 +
  25  drivers/phy/phy-bcm-ns-usb2.c                      | 137 +++++++++++++++++++++
  26  include/linux/bcma/bcma.h                          |   1 +
  27  include/linux/bcma/bcma_driver_arm_c9.h            |  15 +++
  28  6 files changed, 184 insertions(+)
  29  create mode 100644 Documentation/devicetree/bindings/phy/bcm-ns-usb2-phy.txt
  30  create mode 100644 drivers/phy/phy-bcm-ns-usb2.c
  31  create mode 100644 include/linux/bcma/bcma_driver_arm_c9.h
  32
  33 diff --git a/Documentation/devicetree/bindings/phy/bcm-ns-usb2-phy.txt b/Documentation/devicetree/bindings/phy/bcm-ns-usb2-phy.txt
  34 new file mode 100644
  35 index 0000000..a7aee9e
  36 --- /dev/null
  37 +++ b/Documentation/devicetree/bindings/phy/bcm-ns-usb2-phy.txt
  38 @@ -0,0 +1,21 @@
  39 +Driver for Broadcom Northstar USB 2.0 PHY
  40 +
  41 +Required properties:
  42 +- compatible: brcm,ns-usb2-phy
  43 +- reg: iomem address range of DMU (Device Management Unit)
  44 +- reg-names: "dmu", the only needed & supported reg right now
  45 +- clocks: USB PHY reference clock
  46 +- clock-names: "phy-ref-clk", the only needed & supported clock right now
  47 +
  48 +To initialize USB 2.0 PHY driver needs to setup PLL correctly. To do this it
  49 +requires passing phandle to the USB PHY reference clock.
  50 +
  51 +Example:
  52 +       usb2-phy {
  53 +               compatible = "brcm,ns-usb2-phy";
  54 +               reg = <0x1800c000 0x1000>;
  55 +               reg-names = "dmu";
  56 +               #phy-cells = <0>;
  57 +               clocks = <&genpll BCM_NSP_GENPLL_USB_PHY_REF_CLK>;
  58 +               clock-names = "phy-ref-clk";
  59 +       };
  60 diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
  61 index f6ff76e..f2b458f 100644
  62 --- a/drivers/phy/Kconfig
  63 +++ b/drivers/phy/Kconfig
  64 @@ -15,6 +15,15 @@ config GENERIC_PHY
  65           phy users can obtain reference to the PHY. All the users of this
  66           framework should select this config.
  67
  68 +config PHY_BCM_NS_USB2
  69 +       tristate "Broadcom Northstar USB 2.0 PHY Driver"
  70 +       depends on ARCH_BCM_IPROC || COMPILE_TEST
  71 +       depends on HAS_IOMEM && OF
  72 +       select GENERIC_PHY
  73 +       help
  74 +         Enable this to support Broadcom USB 2.0 PHY connected to the USB
  75 +         controller on Northstar family.
  76 +
  77  config PHY_BERLIN_USB
  78         tristate "Marvell Berlin USB PHY Driver"
  79         depends on ARCH_BERLIN && RESET_CONTROLLER && HAS_IOMEM && OF
  80 diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
  81 index f03fa1f..0de09e1 100644
  82 --- a/drivers/phy/Makefile
  83 +++ b/drivers/phy/Makefile
  84 @@ -3,6 +3,7 @@
  85  #
  86
  87  obj-$(CONFIG_GENERIC_PHY)              += phy-core.o
  88 +obj-$(CONFIG_PHY_BCM_NS_USB2)          += phy-bcm-ns-usb2.o
  89  obj-$(CONFIG_PHY_BERLIN_USB)           += phy-berlin-usb.o
  90  obj-$(CONFIG_PHY_BERLIN_SATA)          += phy-berlin-sata.o
  91  obj-$(CONFIG_PHY_DM816X_USB)           += phy-dm816x-usb.o
  92 diff --git a/drivers/phy/phy-bcm-ns-usb2.c b/drivers/phy/phy-bcm-ns-usb2.c
  93 new file mode 100644
  94 index 0000000..95ab6b2
  95 --- /dev/null
  96 +++ b/drivers/phy/phy-bcm-ns-usb2.c
  97 @@ -0,0 +1,137 @@
  98 +/*
  99 + * Broadcom Northstar USB 2.0 PHY Driver
 100 + *
 101 + * Copyright (C) 2016 Rafał Miłecki <zajec5@gmail.com>
 102 + *
 103 + * This program is free software; you can redistribute it and/or modify
 104 + * it under the terms of the GNU General Public License version 2 as
 105 + * published by the Free Software Foundation.
 106 + *
 107 + */
 108 +
 109 +#include <linux/bcma/bcma.h>
 110 +#include <linux/clk.h>
 111 +#include <linux/delay.h>
 112 +#include <linux/err.h>
 113 +#include <linux/module.h>
 114 +#include <linux/of_address.h>
 115 +#include <linux/of_platform.h>
 116 +#include <linux/phy/phy.h>
 117 +#include <linux/platform_device.h>
 118 +#include <linux/slab.h>
 119 +
 120 +struct bcm_ns_usb2 {
 121 +       struct device *dev;
 122 +       struct clk *ref_clk;
 123 +       struct phy *phy;
 124 +       void __iomem *dmu;
 125 +};
 126 +
 127 +static int bcm_ns_usb2_phy_init(struct phy *phy)
 128 +{
 129 +       struct bcm_ns_usb2 *usb2 = phy_get_drvdata(phy);
 130 +       struct device *dev = usb2->dev;
 131 +       void __iomem *dmu = usb2->dmu;
 132 +       u32 ref_clk_rate, usb2ctl, usb_pll_ndiv, usb_pll_pdiv;
 133 +       int err = 0;
 134 +
 135 +       err = clk_prepare_enable(usb2->ref_clk);
 136 +       if (err < 0) {
 137 +               dev_err(dev, "Failed to prepare ref clock: %d\n", err);
 138 +               goto err_out;
 139 +       }
 140 +
 141 +       ref_clk_rate = clk_get_rate(usb2->ref_clk);
 142 +       if (!ref_clk_rate) {
 143 +               dev_err(dev, "Failed to get ref clock rate\n");
 144 +               err = -EINVAL;
 145 +               goto err_clk_off;
 146 +       }
 147 +
 148 +       usb2ctl = readl(dmu + BCMA_DMU_CRU_USB2_CONTROL);
 149 +
 150 +       if (usb2ctl & BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK) {
 151 +               usb_pll_pdiv = usb2ctl;
 152 +               usb_pll_pdiv &= BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK;
 153 +               usb_pll_pdiv >>= BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_SHIFT;
 154 +       } else {
 155 +               usb_pll_pdiv = 1 << 3;
 156 +       }
 157 +
 158 +       /* Calculate ndiv based on a solid 1920 MHz that is for USB2 PHY */
 159 +       usb_pll_ndiv = (1920000000 * usb_pll_pdiv) / ref_clk_rate;
 160 +
 161 +       /* Unlock DMU PLL settings with some magic value */
 162 +       writel(0x0000ea68, dmu + BCMA_DMU_CRU_CLKSET_KEY);
 163 +
 164 +       /* Write USB 2.0 PLL control setting */
 165 +       usb2ctl &= ~BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_MASK;
 166 +       usb2ctl |= usb_pll_ndiv << BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_SHIFT;
 167 +       writel(usb2ctl, dmu + BCMA_DMU_CRU_USB2_CONTROL);
 168 +
 169 +       /* Lock DMU PLL settings */
 170 +       writel(0x00000000, dmu + BCMA_DMU_CRU_CLKSET_KEY);
 171 +
 172 +err_clk_off:
 173 +       clk_disable_unprepare(usb2->ref_clk);
 174 +err_out:
 175 +       return err;
 176 +}
 177 +
 178 +static const struct phy_ops ops = {
 179 +       .init           = bcm_ns_usb2_phy_init,
 180 +       .owner          = THIS_MODULE,
 181 +};
 182 +
 183 +static int bcm_ns_usb2_probe(struct platform_device *pdev)
 184 +{
 185 +       struct device *dev = &pdev->dev;
 186 +       struct bcm_ns_usb2 *usb2;
 187 +       struct resource *res;
 188 +       struct phy_provider *phy_provider;
 189 +
 190 +       usb2 = devm_kzalloc(&pdev->dev, sizeof(*usb2), GFP_KERNEL);
 191 +       if (!usb2)
 192 +               return -ENOMEM;
 193 +       usb2->dev = dev;
 194 +
 195 +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dmu");
 196 +       usb2->dmu = devm_ioremap_resource(dev, res);
 197 +       if (IS_ERR(usb2->dmu)) {
 198 +               dev_err(dev, "Failed to map DMU regs\n");
 199 +               return PTR_ERR(usb2->dmu);
 200 +       }
 201 +
 202 +       usb2->ref_clk = devm_clk_get(dev, "phy-ref-clk");
 203 +       if (IS_ERR(usb2->ref_clk)) {
 204 +               dev_err(dev, "Clock not defined\n");
 205 +               return PTR_ERR(usb2->ref_clk);
 206 +       }
 207 +
 208 +       usb2->phy = devm_phy_create(dev, NULL, &ops);
 209 +       if (IS_ERR(dev))
 210 +               return PTR_ERR(dev);
 211 +
 212 +       phy_set_drvdata(usb2->phy, usb2);
 213 +       platform_set_drvdata(pdev, usb2);
 214 +
 215 +       phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 216 +       return PTR_ERR_OR_ZERO(phy_provider);
 217 +}
 218 +
 219 +static const struct of_device_id bcm_ns_usb2_id_table[] = {
 220 +       { .compatible = "brcm,ns-usb2-phy", },
 221 +       {},
 222 +};
 223 +MODULE_DEVICE_TABLE(of, bcm_ns_usb2_id_table);
 224 +
 225 +static struct platform_driver bcm_ns_usb2_driver = {
 226 +       .probe          = bcm_ns_usb2_probe,
 227 +       .driver = {
 228 +               .name = "bcm_ns_usb2",
 229 +               .of_match_table = bcm_ns_usb2_id_table,
 230 +       },
 231 +};
 232 +module_platform_driver(bcm_ns_usb2_driver);
 233 +
 234 +MODULE_LICENSE("GPL v2");
 235 diff --git a/include/linux/bcma/bcma.h b/include/linux/bcma/bcma.h
 236 index 0367c63..e6b41f4 100644
 237 --- a/include/linux/bcma/bcma.h
 238 +++ b/include/linux/bcma/bcma.h
 239 @@ -4,6 +4,7 @@
 240  #include <linux/pci.h>
 241  #include <linux/mod_devicetable.h>
 242
 243 +#include <linux/bcma/bcma_driver_arm_c9.h>
 244  #include <linux/bcma/bcma_driver_chipcommon.h>
 245  #include <linux/bcma/bcma_driver_pci.h>
 246  #include <linux/bcma/bcma_driver_pcie2.h>
 247 diff --git a/include/linux/bcma/bcma_driver_arm_c9.h b/include/linux/bcma/bcma_driver_arm_c9.h
 248 new file mode 100644
 249 index 0000000..93bd73d
 250 --- /dev/null
 251 +++ b/include/linux/bcma/bcma_driver_arm_c9.h
 252 @@ -0,0 +1,15 @@
 253 +#ifndef LINUX_BCMA_DRIVER_ARM_C9_H_
 254 +#define LINUX_BCMA_DRIVER_ARM_C9_H_
 255 +
 256 +/* DMU (Device Management Unit) */
 257 +#define BCMA_DMU_CRU_USB2_CONTROL                      0x0164
 258 +#define  BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_MASK   0x00000FFC
 259 +#define  BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_SHIFT  2
 260 +#define  BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK   0x00007000
 261 +#define  BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_SHIFT  12
 262 +#define BCMA_DMU_CRU_CLKSET_KEY                                0x0180
 263 +#define BCMA_DMU_CRU_STRAPS_CTRL                       0x02A0
 264 +#define  BCMA_DMU_CRU_STRAPS_CTRL_USB3                 0x00000010
 265 +#define  BCMA_DMU_CRU_STRAPS_CTRL_4BYTE                        0x00008000
 266 +
 267 +#endif /* LINUX_BCMA_DRIVER_ARM_C9_H_ */
 268 --
 269 1.8.4.5
 270