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644930cbad
Turned from arch/arm/mach-mmp/devices.c into a proper PHY driver, so that in can be instantiated from a DT. Acked-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
345 lines
9.7 KiB
C
345 lines
9.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2011 Marvell International Ltd. All rights reserved.
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* Copyright (C) 2018 Lubomir Rintel <lkundrak@v3.sk>
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*/
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#include <dt-bindings/phy/phy.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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/* phy regs */
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#define UTMI_REVISION 0x0
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#define UTMI_CTRL 0x4
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#define UTMI_PLL 0x8
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#define UTMI_TX 0xc
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#define UTMI_RX 0x10
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#define UTMI_IVREF 0x14
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#define UTMI_T0 0x18
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#define UTMI_T1 0x1c
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#define UTMI_T2 0x20
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#define UTMI_T3 0x24
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#define UTMI_T4 0x28
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#define UTMI_T5 0x2c
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#define UTMI_RESERVE 0x30
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#define UTMI_USB_INT 0x34
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#define UTMI_DBG_CTL 0x38
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#define UTMI_OTG_ADDON 0x3c
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/* For UTMICTRL Register */
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#define UTMI_CTRL_USB_CLK_EN (1 << 31)
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/* pxa168 */
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#define UTMI_CTRL_SUSPEND_SET1 (1 << 30)
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#define UTMI_CTRL_SUSPEND_SET2 (1 << 29)
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#define UTMI_CTRL_RXBUF_PDWN (1 << 24)
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#define UTMI_CTRL_TXBUF_PDWN (1 << 11)
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#define UTMI_CTRL_INPKT_DELAY_SHIFT 30
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#define UTMI_CTRL_INPKT_DELAY_SOF_SHIFT 28
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#define UTMI_CTRL_PU_REF_SHIFT 20
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#define UTMI_CTRL_ARC_PULLDN_SHIFT 12
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#define UTMI_CTRL_PLL_PWR_UP_SHIFT 1
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#define UTMI_CTRL_PWR_UP_SHIFT 0
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/* For UTMI_PLL Register */
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#define UTMI_PLL_PLLCALI12_SHIFT 29
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#define UTMI_PLL_PLLCALI12_MASK (0x3 << 29)
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#define UTMI_PLL_PLLVDD18_SHIFT 27
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#define UTMI_PLL_PLLVDD18_MASK (0x3 << 27)
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#define UTMI_PLL_PLLVDD12_SHIFT 25
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#define UTMI_PLL_PLLVDD12_MASK (0x3 << 25)
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#define UTMI_PLL_CLK_BLK_EN_SHIFT 24
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#define CLK_BLK_EN (0x1 << 24)
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#define PLL_READY (0x1 << 23)
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#define KVCO_EXT (0x1 << 22)
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#define VCOCAL_START (0x1 << 21)
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#define UTMI_PLL_KVCO_SHIFT 15
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#define UTMI_PLL_KVCO_MASK (0x7 << 15)
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#define UTMI_PLL_ICP_SHIFT 12
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#define UTMI_PLL_ICP_MASK (0x7 << 12)
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#define UTMI_PLL_FBDIV_SHIFT 4
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#define UTMI_PLL_FBDIV_MASK (0xFF << 4)
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#define UTMI_PLL_REFDIV_SHIFT 0
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#define UTMI_PLL_REFDIV_MASK (0xF << 0)
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/* For UTMI_TX Register */
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#define UTMI_TX_REG_EXT_FS_RCAL_SHIFT 27
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#define UTMI_TX_REG_EXT_FS_RCAL_MASK (0xf << 27)
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#define UTMI_TX_REG_EXT_FS_RCAL_EN_SHIFT 26
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#define UTMI_TX_REG_EXT_FS_RCAL_EN_MASK (0x1 << 26)
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#define UTMI_TX_TXVDD12_SHIFT 22
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#define UTMI_TX_TXVDD12_MASK (0x3 << 22)
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#define UTMI_TX_CK60_PHSEL_SHIFT 17
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#define UTMI_TX_CK60_PHSEL_MASK (0xf << 17)
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#define UTMI_TX_IMPCAL_VTH_SHIFT 14
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#define UTMI_TX_IMPCAL_VTH_MASK (0x7 << 14)
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#define REG_RCAL_START (0x1 << 12)
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#define UTMI_TX_LOW_VDD_EN_SHIFT 11
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#define UTMI_TX_AMP_SHIFT 0
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#define UTMI_TX_AMP_MASK (0x7 << 0)
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/* For UTMI_RX Register */
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#define UTMI_REG_SQ_LENGTH_SHIFT 15
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#define UTMI_REG_SQ_LENGTH_MASK (0x3 << 15)
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#define UTMI_RX_SQ_THRESH_SHIFT 4
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#define UTMI_RX_SQ_THRESH_MASK (0xf << 4)
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#define UTMI_OTG_ADDON_OTG_ON (1 << 0)
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enum pxa_usb_phy_version {
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PXA_USB_PHY_MMP2,
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PXA_USB_PHY_PXA910,
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PXA_USB_PHY_PXA168,
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};
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struct pxa_usb_phy {
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struct phy *phy;
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void __iomem *base;
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enum pxa_usb_phy_version version;
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};
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/*****************************************************************************
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* The registers read/write routines
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*****************************************************************************/
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static unsigned int u2o_get(void __iomem *base, unsigned int offset)
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{
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return readl_relaxed(base + offset);
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}
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static void u2o_set(void __iomem *base, unsigned int offset,
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unsigned int value)
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{
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u32 reg;
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reg = readl_relaxed(base + offset);
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reg |= value;
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writel_relaxed(reg, base + offset);
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readl_relaxed(base + offset);
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}
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static void u2o_clear(void __iomem *base, unsigned int offset,
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unsigned int value)
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{
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u32 reg;
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reg = readl_relaxed(base + offset);
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reg &= ~value;
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writel_relaxed(reg, base + offset);
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readl_relaxed(base + offset);
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}
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static void u2o_write(void __iomem *base, unsigned int offset,
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unsigned int value)
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{
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writel_relaxed(value, base + offset);
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readl_relaxed(base + offset);
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}
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static int pxa_usb_phy_init(struct phy *phy)
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{
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struct pxa_usb_phy *pxa_usb_phy = phy_get_drvdata(phy);
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void __iomem *base = pxa_usb_phy->base;
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int loops;
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dev_info(&phy->dev, "initializing Marvell PXA USB PHY");
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/* Initialize the USB PHY power */
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if (pxa_usb_phy->version == PXA_USB_PHY_PXA910) {
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u2o_set(base, UTMI_CTRL, (1<<UTMI_CTRL_INPKT_DELAY_SOF_SHIFT)
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| (1<<UTMI_CTRL_PU_REF_SHIFT));
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}
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u2o_set(base, UTMI_CTRL, 1<<UTMI_CTRL_PLL_PWR_UP_SHIFT);
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u2o_set(base, UTMI_CTRL, 1<<UTMI_CTRL_PWR_UP_SHIFT);
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/* UTMI_PLL settings */
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u2o_clear(base, UTMI_PLL, UTMI_PLL_PLLVDD18_MASK
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| UTMI_PLL_PLLVDD12_MASK | UTMI_PLL_PLLCALI12_MASK
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| UTMI_PLL_FBDIV_MASK | UTMI_PLL_REFDIV_MASK
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| UTMI_PLL_ICP_MASK | UTMI_PLL_KVCO_MASK);
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u2o_set(base, UTMI_PLL, 0xee<<UTMI_PLL_FBDIV_SHIFT
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| 0xb<<UTMI_PLL_REFDIV_SHIFT | 3<<UTMI_PLL_PLLVDD18_SHIFT
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| 3<<UTMI_PLL_PLLVDD12_SHIFT | 3<<UTMI_PLL_PLLCALI12_SHIFT
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| 1<<UTMI_PLL_ICP_SHIFT | 3<<UTMI_PLL_KVCO_SHIFT);
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/* UTMI_TX */
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u2o_clear(base, UTMI_TX, UTMI_TX_REG_EXT_FS_RCAL_EN_MASK
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| UTMI_TX_TXVDD12_MASK | UTMI_TX_CK60_PHSEL_MASK
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| UTMI_TX_IMPCAL_VTH_MASK | UTMI_TX_REG_EXT_FS_RCAL_MASK
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| UTMI_TX_AMP_MASK);
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u2o_set(base, UTMI_TX, 3<<UTMI_TX_TXVDD12_SHIFT
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| 4<<UTMI_TX_CK60_PHSEL_SHIFT | 4<<UTMI_TX_IMPCAL_VTH_SHIFT
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| 8<<UTMI_TX_REG_EXT_FS_RCAL_SHIFT | 3<<UTMI_TX_AMP_SHIFT);
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/* UTMI_RX */
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u2o_clear(base, UTMI_RX, UTMI_RX_SQ_THRESH_MASK
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| UTMI_REG_SQ_LENGTH_MASK);
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u2o_set(base, UTMI_RX, 7<<UTMI_RX_SQ_THRESH_SHIFT
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| 2<<UTMI_REG_SQ_LENGTH_SHIFT);
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/* UTMI_IVREF */
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if (pxa_usb_phy->version == PXA_USB_PHY_PXA168) {
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/*
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* fixing Microsoft Altair board interface with NEC hub issue -
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* Set UTMI_IVREF from 0x4a3 to 0x4bf
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*/
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u2o_write(base, UTMI_IVREF, 0x4bf);
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}
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/* toggle VCOCAL_START bit of UTMI_PLL */
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udelay(200);
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u2o_set(base, UTMI_PLL, VCOCAL_START);
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udelay(40);
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u2o_clear(base, UTMI_PLL, VCOCAL_START);
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/* toggle REG_RCAL_START bit of UTMI_TX */
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udelay(400);
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u2o_set(base, UTMI_TX, REG_RCAL_START);
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udelay(40);
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u2o_clear(base, UTMI_TX, REG_RCAL_START);
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udelay(400);
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/* Make sure PHY PLL is ready */
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loops = 0;
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while ((u2o_get(base, UTMI_PLL) & PLL_READY) == 0) {
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mdelay(1);
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loops++;
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if (loops > 100) {
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dev_warn(&phy->dev, "calibrate timeout, UTMI_PLL %x\n",
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u2o_get(base, UTMI_PLL));
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break;
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}
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}
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if (pxa_usb_phy->version == PXA_USB_PHY_PXA168) {
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u2o_set(base, UTMI_RESERVE, 1 << 5);
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/* Turn on UTMI PHY OTG extension */
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u2o_write(base, UTMI_OTG_ADDON, 1);
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}
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return 0;
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}
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static int pxa_usb_phy_exit(struct phy *phy)
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{
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struct pxa_usb_phy *pxa_usb_phy = phy_get_drvdata(phy);
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void __iomem *base = pxa_usb_phy->base;
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dev_info(&phy->dev, "deinitializing Marvell PXA USB PHY");
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if (pxa_usb_phy->version == PXA_USB_PHY_PXA168)
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u2o_clear(base, UTMI_OTG_ADDON, UTMI_OTG_ADDON_OTG_ON);
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u2o_clear(base, UTMI_CTRL, UTMI_CTRL_RXBUF_PDWN);
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u2o_clear(base, UTMI_CTRL, UTMI_CTRL_TXBUF_PDWN);
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u2o_clear(base, UTMI_CTRL, UTMI_CTRL_USB_CLK_EN);
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u2o_clear(base, UTMI_CTRL, 1<<UTMI_CTRL_PWR_UP_SHIFT);
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u2o_clear(base, UTMI_CTRL, 1<<UTMI_CTRL_PLL_PWR_UP_SHIFT);
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return 0;
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}
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static const struct phy_ops pxa_usb_phy_ops = {
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.init = pxa_usb_phy_init,
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.exit = pxa_usb_phy_exit,
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.owner = THIS_MODULE,
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};
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static const struct of_device_id pxa_usb_phy_of_match[] = {
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{
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.compatible = "marvell,mmp2-usb-phy",
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.data = (void *)PXA_USB_PHY_MMP2,
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}, {
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.compatible = "marvell,pxa910-usb-phy",
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.data = (void *)PXA_USB_PHY_PXA910,
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}, {
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.compatible = "marvell,pxa168-usb-phy",
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.data = (void *)PXA_USB_PHY_PXA168,
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, pxa_usb_phy_of_match);
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static int pxa_usb_phy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *resource;
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struct pxa_usb_phy *pxa_usb_phy;
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struct phy_provider *provider;
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const struct of_device_id *of_id;
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pxa_usb_phy = devm_kzalloc(dev, sizeof(struct pxa_usb_phy), GFP_KERNEL);
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if (!pxa_usb_phy)
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return -ENOMEM;
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of_id = of_match_node(pxa_usb_phy_of_match, dev->of_node);
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if (of_id)
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pxa_usb_phy->version = (enum pxa_usb_phy_version)of_id->data;
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else
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pxa_usb_phy->version = PXA_USB_PHY_MMP2;
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resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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pxa_usb_phy->base = devm_ioremap_resource(dev, resource);
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if (IS_ERR(pxa_usb_phy->base)) {
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dev_err(dev, "failed to remap PHY regs\n");
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return PTR_ERR(pxa_usb_phy->base);
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}
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pxa_usb_phy->phy = devm_phy_create(dev, NULL, &pxa_usb_phy_ops);
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if (IS_ERR(pxa_usb_phy->phy)) {
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dev_err(dev, "failed to create PHY\n");
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return PTR_ERR(pxa_usb_phy->phy);
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}
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phy_set_drvdata(pxa_usb_phy->phy, pxa_usb_phy);
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provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
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if (IS_ERR(provider)) {
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dev_err(dev, "failed to register PHY provider\n");
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return PTR_ERR(provider);
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}
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if (!dev->of_node) {
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phy_create_lookup(pxa_usb_phy->phy, "usb", "mv-udc");
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phy_create_lookup(pxa_usb_phy->phy, "usb", "pxa-u2oehci");
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phy_create_lookup(pxa_usb_phy->phy, "usb", "mv-otg");
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}
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dev_info(dev, "Marvell PXA USB PHY");
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return 0;
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}
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static struct platform_driver pxa_usb_phy_driver = {
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.probe = pxa_usb_phy_probe,
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.driver = {
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.name = "pxa-usb-phy",
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.of_match_table = pxa_usb_phy_of_match,
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},
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};
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module_platform_driver(pxa_usb_phy_driver);
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MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
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MODULE_DESCRIPTION("Marvell PXA USB PHY Driver");
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MODULE_LICENSE("GPL v2");
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