From mboxrd@z Thu Jan 1 00:00:00 1970 From: kishon@ti.com (kishon) Date: Wed, 6 Feb 2013 13:40:18 +0530 Subject: [V6 PATCH 01/16] usb: phy: mv_usb2: add PHY driver for marvell usb2 controller In-Reply-To: <1360135431-27280-2-git-send-email-chao.xie@marvell.com> References: <1360135431-27280-1-git-send-email-chao.xie@marvell.com> <1360135431-27280-2-git-send-email-chao.xie@marvell.com> Message-ID: <51120FEA.3070901@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, On Wednesday 06 February 2013 12:53 PM, Chao Xie wrote: > The PHY is seperated from usb controller. > The usb controller used in marvell pxa168/pxa910/mmp2 are same, > but PHY initialization may be different. > the usb controller can support udc/otg/ehci, and for each of > the mode, it need PHY to initialized before use the controller. > Direclty writing the phy driver will make the usb controller > driver to be simple and portable. > The PHY driver will be used by marvell udc/otg/ehci. > > Signed-off-by: Chao Xie > --- > drivers/usb/phy/Kconfig | 7 + > drivers/usb/phy/Makefile | 1 + > drivers/usb/phy/mv_usb2_phy.c | 454 ++++++++++++++++++++++++++++++++++ > include/linux/platform_data/mv_usb.h | 9 +- > include/linux/usb/mv_usb2.h | 43 ++++ > 5 files changed, 511 insertions(+), 3 deletions(-) > create mode 100644 drivers/usb/phy/mv_usb2_phy.c > create mode 100644 include/linux/usb/mv_usb2.h > > diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig > index 65217a5..5479760 100644 > --- a/drivers/usb/phy/Kconfig > +++ b/drivers/usb/phy/Kconfig > @@ -73,3 +73,10 @@ config SAMSUNG_USBPHY > help > Enable this to support Samsung USB phy controller for samsung > SoCs. > + > +config MV_USB2_PHY > + tristate "Marvell USB 2.0 PHY Driver" > + depends on USB || USB_GADGET > + help > + Enable this to support Marvell USB 2.0 phy driver for Marvell > + SoC. > diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile > index b13faa1..3835316 100644 > --- a/drivers/usb/phy/Makefile > +++ b/drivers/usb/phy/Makefile > @@ -12,3 +12,4 @@ obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o > obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o > obj-$(CONFIG_USB_RCAR_PHY) += rcar-phy.o > obj-$(CONFIG_SAMSUNG_USBPHY) += samsung-usbphy.o > +obj-$(CONFIG_MV_USB2_PHY) += mv_usb2_phy.o > diff --git a/drivers/usb/phy/mv_usb2_phy.c b/drivers/usb/phy/mv_usb2_phy.c > new file mode 100644 > index 0000000..c2bccae > --- /dev/null > +++ b/drivers/usb/phy/mv_usb2_phy.c > @@ -0,0 +1,454 @@ > +/* > + * Copyright (C) 2010 Google, Inc. > + * > + * Author: > + * Chao Xie > + * > + * This software is licensed under the terms of the GNU General Public > + * License version 2, as published by the Free Software Foundation, and > + * may be copied, distributed, and modified under those terms. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +/* phy regs */ > +#define UTMI_REVISION 0x0 > +#define UTMI_CTRL 0x4 > +#define UTMI_PLL 0x8 > +#define UTMI_TX 0xc > +#define UTMI_RX 0x10 > +#define UTMI_IVREF 0x14 > +#define UTMI_T0 0x18 > +#define UTMI_T1 0x1c > +#define UTMI_T2 0x20 > +#define UTMI_T3 0x24 > +#define UTMI_T4 0x28 > +#define UTMI_T5 0x2c > +#define UTMI_RESERVE 0x30 > +#define UTMI_USB_INT 0x34 > +#define UTMI_DBG_CTL 0x38 > +#define UTMI_OTG_ADDON 0x3c > + > +/* For UTMICTRL Register */ > +#define UTMI_CTRL_USB_CLK_EN (1 << 31) > +/* pxa168 */ > +#define UTMI_CTRL_SUSPEND_SET1 (1 << 30) > +#define UTMI_CTRL_SUSPEND_SET2 (1 << 29) > +#define UTMI_CTRL_RXBUF_PDWN (1 << 24) > +#define UTMI_CTRL_TXBUF_PDWN (1 << 11) > + > +#define UTMI_CTRL_INPKT_DELAY_SHIFT 30 > +#define UTMI_CTRL_INPKT_DELAY_SOF_SHIFT 28 > +#define UTMI_CTRL_PU_REF_SHIFT 20 > +#define UTMI_CTRL_ARC_PULLDN_SHIFT 12 > +#define UTMI_CTRL_PLL_PWR_UP_SHIFT 1 > +#define UTMI_CTRL_PWR_UP_SHIFT 0 > + > +/* For UTMI_PLL Register */ > +#define UTMI_PLL_PLLCALI12_SHIFT 29 > +#define UTMI_PLL_PLLCALI12_MASK (0x3 << 29) > + > +#define UTMI_PLL_PLLVDD18_SHIFT 27 > +#define UTMI_PLL_PLLVDD18_MASK (0x3 << 27) > + > +#define UTMI_PLL_PLLVDD12_SHIFT 25 > +#define UTMI_PLL_PLLVDD12_MASK (0x3 << 25) > + > +#define UTMI_PLL_CLK_BLK_EN_SHIFT 24 > +#define CLK_BLK_EN (0x1 << 24) > +#define PLL_READY (0x1 << 23) > +#define KVCO_EXT (0x1 << 22) > +#define VCOCAL_START (0x1 << 21) > + > +#define UTMI_PLL_KVCO_SHIFT 15 > +#define UTMI_PLL_KVCO_MASK (0x7 << 15) > + > +#define UTMI_PLL_ICP_SHIFT 12 > +#define UTMI_PLL_ICP_MASK (0x7 << 12) > + > +#define UTMI_PLL_FBDIV_SHIFT 4 > +#define UTMI_PLL_FBDIV_MASK (0xFF << 4) > + > +#define UTMI_PLL_REFDIV_SHIFT 0 > +#define UTMI_PLL_REFDIV_MASK (0xF << 0) > + > +/* For UTMI_TX Register */ > +#define UTMI_TX_REG_EXT_FS_RCAL_SHIFT 27 > +#define UTMI_TX_REG_EXT_FS_RCAL_MASK (0xf << 27) > + > +#define UTMI_TX_REG_EXT_FS_RCAL_EN_SHIFT 26 > +#define UTMI_TX_REG_EXT_FS_RCAL_EN_MASK (0x1 << 26) > + > +#define UTMI_TX_TXVDD12_SHIFT 22 > +#define UTMI_TX_TXVDD12_MASK (0x3 << 22) > + > +#define UTMI_TX_CK60_PHSEL_SHIFT 17 > +#define UTMI_TX_CK60_PHSEL_MASK (0xf << 17) > + > +#define UTMI_TX_IMPCAL_VTH_SHIFT 14 > +#define UTMI_TX_IMPCAL_VTH_MASK (0x7 << 14) > + > +#define REG_RCAL_START (0x1 << 12) > + > +#define UTMI_TX_LOW_VDD_EN_SHIFT 11 > + > +#define UTMI_TX_AMP_SHIFT 0 > +#define UTMI_TX_AMP_MASK (0x7 << 0) > + > +/* For UTMI_RX Register */ > +#define UTMI_REG_SQ_LENGTH_SHIFT 15 > +#define UTMI_REG_SQ_LENGTH_MASK (0x3 << 15) > + > +#define UTMI_RX_SQ_THRESH_SHIFT 4 > +#define UTMI_RX_SQ_THRESH_MASK (0xf << 4) > + > +#define UTMI_OTG_ADDON_OTG_ON (1 << 0) > + > +enum mv_usb2_phy_type { > + PXA168_USB, > + PXA910_USB, > + MMP2_USB, > +}; > + > +static struct mv_usb2_phy *the_phy; > + > +struct mv_usb2_phy *mv_usb2_get_phy(void) > +{ > + return the_phy; > +} > +EXPORT_SYMBOL(mv_usb2_get_phy); > + > +static unsigned int u2o_get(void __iomem *base, unsigned int offset) > +{ > + return readl(base + offset); > +} > + > +static void u2o_set(void __iomem *base, unsigned int offset, > + unsigned int value) > +{ > + u32 reg; > + > + reg = readl(base + offset); > + reg |= value; > + writel(reg, base + offset); > + readl(base + offset); > +} > + > +static void u2o_clear(void __iomem *base, unsigned int offset, > + unsigned int value) > +{ > + u32 reg; > + > + reg = readl(base + offset); > + reg &= ~value; > + writel(reg, base + offset); > + readl(base + offset); > +} > + > +static void u2o_write(void __iomem *base, unsigned int offset, > + unsigned int value) > +{ > + writel(value, base + offset); > + readl(base + offset); > +} > + > +static int _usb_phy_init(struct mv_usb2_phy *mv_phy) > +{ > + struct platform_device *pdev = mv_phy->pdev; > + unsigned int loops = 0; > + void __iomem *base = mv_phy->base; > + > + dev_dbg(&pdev->dev, "phy init\n"); > + > + /* Initialize the USB PHY power */ > + if (mv_phy->type == PXA910_USB) { > + u2o_set(base, UTMI_CTRL, (1< + | (1< + } > + > + u2o_set(base, UTMI_CTRL, 1< + u2o_set(base, UTMI_CTRL, 1< + > + /* UTMI_PLL settings */ > + u2o_clear(base, UTMI_PLL, UTMI_PLL_PLLVDD18_MASK > + | UTMI_PLL_PLLVDD12_MASK | UTMI_PLL_PLLCALI12_MASK > + | UTMI_PLL_FBDIV_MASK | UTMI_PLL_REFDIV_MASK > + | UTMI_PLL_ICP_MASK | UTMI_PLL_KVCO_MASK); > + > + u2o_set(base, UTMI_PLL, 0xee< + | 0xb< + | 3< + | 1< + > + /* UTMI_TX */ > + u2o_clear(base, UTMI_TX, UTMI_TX_REG_EXT_FS_RCAL_EN_MASK > + | UTMI_TX_TXVDD12_MASK | UTMI_TX_CK60_PHSEL_MASK > + | UTMI_TX_IMPCAL_VTH_MASK | UTMI_TX_REG_EXT_FS_RCAL_MASK > + | UTMI_TX_AMP_MASK); > + u2o_set(base, UTMI_TX, 3< + | 4< + | 8< + > + /* UTMI_RX */ > + u2o_clear(base, UTMI_RX, UTMI_RX_SQ_THRESH_MASK > + | UTMI_REG_SQ_LENGTH_MASK); > + u2o_set(base, UTMI_RX, 7< + | 2< + > + /* UTMI_IVREF */ > + if (mv_phy->type == PXA168_USB) > + /* fixing Microsoft Altair board interface with NEC hub issue - > + * Set UTMI_IVREF from 0x4a3 to 0x4bf */ > + u2o_write(base, UTMI_IVREF, 0x4bf); > + > + /* toggle VCOCAL_START bit of UTMI_PLL */ > + udelay(200); > + u2o_set(base, UTMI_PLL, VCOCAL_START); > + udelay(40); > + u2o_clear(base, UTMI_PLL, VCOCAL_START); > + > + /* toggle REG_RCAL_START bit of UTMI_TX */ > + udelay(400); > + u2o_set(base, UTMI_TX, REG_RCAL_START); > + udelay(40); > + u2o_clear(base, UTMI_TX, REG_RCAL_START); > + udelay(400); > + > + /* Make sure PHY PLL is ready */ > + loops = 0; > + while ((u2o_get(base, UTMI_PLL) & PLL_READY) == 0) { > + mdelay(1); > + loops++; > + if (loops > 100) { > + dev_warn(&pdev->dev, "calibrate timeout, UTMI_PLL %x\n", > + u2o_get(base, UTMI_PLL)); > + break; > + } > + } > + > + if (mv_phy->type == PXA168_USB) { > + u2o_set(base, UTMI_RESERVE, 1 << 5); > + /* Turn on UTMI PHY OTG extension */ > + u2o_write(base, UTMI_OTG_ADDON, 1); > + } > + > + return 0; > +} > + > +static int _usb_phy_shutdown(struct mv_usb2_phy *mv_phy) > +{ > + void __iomem *base = mv_phy->base; > + > + if (mv_phy->type == PXA168_USB) > + u2o_clear(base, UTMI_OTG_ADDON, UTMI_OTG_ADDON_OTG_ON); > + > + u2o_clear(base, UTMI_CTRL, UTMI_CTRL_RXBUF_PDWN); > + u2o_clear(base, UTMI_CTRL, UTMI_CTRL_TXBUF_PDWN); > + u2o_clear(base, UTMI_CTRL, UTMI_CTRL_USB_CLK_EN); > + u2o_clear(base, UTMI_CTRL, 1< + u2o_clear(base, UTMI_CTRL, 1< + > + return 0; > +} > + > +static int usb_phy_init(struct mv_usb2_phy *mv_phy) > +{ > + int i = 0; > + > + mutex_lock(&mv_phy->phy_lock); > + if (mv_phy->refcount++ == 0) { > + for (i = 0; i < mv_phy->clks_num; i++) > + clk_prepare_enable(mv_phy->clks[i]); > + _usb_phy_init(mv_phy); > + } > + mutex_unlock(&mv_phy->phy_lock); > + return 0; > +} > + > +static void usb_phy_shutdown(struct mv_usb2_phy *mv_phy) > +{ > + int i = 0; > + > + mutex_lock(&mv_phy->phy_lock); > + if (mv_phy->refcount++ == 0) { > + _usb_phy_shutdown(mv_phy); > + for (i = 0; i < mv_phy->clks_num; i++) > + clk_disable_unprepare(mv_phy->clks[i]); > + } > + mutex_unlock(&mv_phy->phy_lock); > +} > + > +static struct of_device_id usb_phy_dt_ids[] = { > + { .compatible = "mrvl,pxa168-usb-phy", .data = (void *)PXA168_USB}, > + { .compatible = "mrvl,pxa910-usb-phy", .data = (void *)PXA910_USB}, > + { .compatible = "mrvl,mmp2-usb-phy", .data = (void *)MMP2_USB}, > + {} > +}; > +MODULE_DEVICE_TABLE(of, usb_phy_dt_ids); > + > +static int usb_phy_parse_dt(struct platform_device *pdev, > + struct mv_usb2_phy *mv_phy) > +{ > + struct device_node *np = pdev->dev.of_node; > + const struct of_device_id *of_id = > + of_match_device(usb_phy_dt_ids, &pdev->dev); > + unsigned int clks_num; > + int i, ret; > + const char *clk_name; > + > + if (!np) > + return 1; > + > + clks_num = of_property_count_strings(np, "clocks"); > + if (clks_num < 0) { > + dev_err(&pdev->dev, "failed to get clock number\n"); > + return clks_num; > + } > + > + mv_phy->clks = devm_kzalloc(&pdev->dev, > + sizeof(struct clk *) * clks_num, GFP_KERNEL); > + if (mv_phy->clks == NULL) { > + dev_err(&pdev->dev, > + "failed to allocate mempory for clocks"); > + return -ENOMEM; > + } > + > + for (i = 0; i < clks_num; i++) { > + ret = of_property_read_string_index(np, "clocks", i, > + &clk_name); > + if (ret) { > + dev_err(&pdev->dev, "failed to read clocks\n"); > + return ret; > + } > + mv_phy->clks[i] = devm_clk_get(&pdev->dev, clk_name); > + if (IS_ERR(mv_phy->clks[i])) { > + dev_err(&pdev->dev, "failed to get clock %s\n", > + clk_name); > + return PTR_ERR(mv_phy->clks[i]); > + } > + } > + > + mv_phy->clks_num = clks_num; > + mv_phy->type = (enum mv_usb2_phy_type)(of_id->data); > + > + return 0; > +} > + > +static int usb_phy_probe(struct platform_device *pdev) > +{ > + struct mv_usb2_phy *mv_phy; > + struct resource *r; > + int ret, i; > + > + mv_phy = devm_kzalloc(&pdev->dev, sizeof(*mv_phy), GFP_KERNEL); > + if (mv_phy == NULL) { > + dev_err(&pdev->dev, "failed to allocate memory\n"); > + return -ENOMEM; > + } > + mutex_init(&mv_phy->phy_lock); > + > + ret = usb_phy_parse_dt(pdev, mv_phy); > + /* no CONFIG_OF */ > + if (ret > 0) { > + struct mv_usb_phy_platform_data *pdata > + = pdev->dev.platform_data; > + const struct platform_device_id *id > + = platform_get_device_id(pdev); > + > + if (pdata == NULL || id == NULL) { > + dev_err(&pdev->dev, > + "missing platform_data or id_entry\n"); > + return -ENODEV; > + } > + mv_phy->type = (unsigned int)(id->driver_data); > + mv_phy->clks_num = pdata->clknum; > + mv_phy->clks = devm_kzalloc(&pdev->dev, > + sizeof(struct clk *) * mv_phy->clks_num, GFP_KERNEL); > + if (mv_phy->clks == NULL) { > + dev_err(&pdev->dev, > + "failed to allocate mempory for clocks"); > + return -ENOMEM; > + } > + for (i = 0; i < mv_phy->clks_num; i++) > + mv_phy->clks[i] = devm_clk_get(&pdev->dev, > + pdata->clkname[i]); > + if (IS_ERR(mv_phy->clks[i])) { > + dev_err(&pdev->dev, "failed to get clock %s\n", > + pdata->clkname[i]); > + return PTR_ERR(mv_phy->clks[i]); > + } > + } else if (ret < 0) { > + dev_err(&pdev->dev, "error parse dt\n"); > + return ret; > + } > + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (r == NULL) { > + dev_err(&pdev->dev, "no phy I/O memory resource defined\n"); > + return -ENODEV; > + } > + mv_phy->base = devm_ioremap(&pdev->dev, r->start, resource_size(r)); > + if (mv_phy->base == NULL) { > + dev_err(&pdev->dev, "error map register base\n"); > + return -EBUSY; > + } > + platform_set_drvdata(pdev, mv_phy); > + mv_phy->pdev = pdev; > + mv_phy->init = usb_phy_init; > + mv_phy->shutdown = usb_phy_shutdown; > + > + platform_set_drvdata(pdev, mv_phy); > + > + the_phy = mv_phy; Is there any specific reason for not using the usb phy library? Please use the APIs provided in drivers/usb/otg/otg.c. These APIs will be moved to phy.c soon. Thanks Kishon