// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2011 Marvell International Ltd. All rights reserved.
* Copyright (C) 2018,2019 Lubomir Rintel <lkundrak@v3.sk>
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/soc/mmp/cputype.h>
#define USB2_PLL_REG0 0x4
#define USB2_PLL_REG1 0x8
#define USB2_TX_REG0 0x10
#define USB2_TX_REG1 0x14
#define USB2_TX_REG2 0x18
#define USB2_RX_REG0 0x20
#define USB2_RX_REG1 0x24
#define USB2_RX_REG2 0x28
#define USB2_ANA_REG0 0x30
#define USB2_ANA_REG1 0x34
#define USB2_ANA_REG2 0x38
#define USB2_DIG_REG0 0x3C
#define USB2_DIG_REG1 0x40
#define USB2_DIG_REG2 0x44
#define USB2_DIG_REG3 0x48
#define USB2_TEST_REG0 0x4C
#define USB2_TEST_REG1 0x50
#define USB2_TEST_REG2 0x54
#define USB2_CHARGER_REG0 0x58
#define USB2_OTG_REG0 0x5C
#define USB2_PHY_MON0 0x60
#define USB2_RESETVE_REG0 0x64
#define USB2_ICID_REG0 0x78
#define USB2_ICID_REG1 0x7C
/* USB2_PLL_REG0 */
/* This is for Ax stepping */
#define USB2_PLL_FBDIV_SHIFT_MMP3 0
#define USB2_PLL_FBDIV_MASK_MMP3 (0xFF << 0)
#define USB2_PLL_REFDIV_SHIFT_MMP3 8
#define USB2_PLL_REFDIV_MASK_MMP3 (0xF << 8)
#define USB2_PLL_VDD12_SHIFT_MMP3 12
#define USB2_PLL_VDD18_SHIFT_MMP3 14
/* This is for B0 stepping */
#define USB2_PLL_FBDIV_SHIFT_MMP3_B0 0
#define USB2_PLL_REFDIV_SHIFT_MMP3_B0 9
#define USB2_PLL_VDD18_SHIFT_MMP3_B0 14
#define USB2_PLL_FBDIV_MASK_MMP3_B0 0x01FF
#define USB2_PLL_REFDIV_MASK_MMP3_B0 0x3E00
#define USB2_PLL_CAL12_SHIFT_MMP3 0
#define USB2_PLL_CALI12_MASK_MMP3 (0x3 << 0)
#define USB2_PLL_VCOCAL_START_SHIFT_MMP3 2
#define USB2_PLL_KVCO_SHIFT_MMP3 4
#define USB2_PLL_KVCO_MASK_MMP3 (0x7<<4)
#define USB2_PLL_ICP_SHIFT_MMP3 8
#define USB2_PLL_ICP_MASK_MMP3 (0x7<<8)
#define USB2_PLL_LOCK_BYPASS_SHIFT_MMP3 12
#define USB2_PLL_PU_PLL_SHIFT_MMP3 13
#define USB2_PLL_PU_PLL_MASK (0x1 << 13)
#define USB2_PLL_READY_MASK_MMP3 (0x1 << 15)
/* USB2_TX_REG0 */
#define USB2_TX_IMPCAL_VTH_SHIFT_MMP3 8
#define USB2_TX_IMPCAL_VTH_MASK_MMP3 (0x7 << 8)
#define USB2_TX_RCAL_START_SHIFT_MMP3 13
/* USB2_TX_REG1 */
#define USB2_TX_CK60_PHSEL_SHIFT_MMP3 0
#define USB2_TX_CK60_PHSEL_MASK_MMP3 (0xf << 0)
#define USB2_TX_AMP_SHIFT_MMP3 4
#define USB2_TX_AMP_MASK_MMP3 (0x7 << 4)
#define USB2_TX_VDD12_SHIFT_MMP3 8
#define USB2_TX_VDD12_MASK_MMP3 (0x3 << 8)
/* USB2_TX_REG2 */
#define USB2_TX_DRV_SLEWRATE_SHIFT 10
/* USB2_RX_REG0 */
#define USB2_RX_SQ_THRESH_SHIFT_MMP3 4
#define USB2_RX_SQ_THRESH_MASK_MMP3 (0xf << 4)
#define USB2_RX_SQ_LENGTH_SHIFT_MMP3 10
#define USB2_RX_SQ_LENGTH_MASK_MMP3 (0x3 << 10)
/* USB2_ANA_REG1*/
#define USB2_ANA_PU_ANA_SHIFT_MMP3 14
/* USB2_OTG_REG0 */
#define USB2_OTG_PU_OTG_SHIFT_MMP3 3
struct mmp3_usb_phy {
struct phy *phy;
void __iomem *base;
};
static unsigned int u2o_get(void __iomem *base, unsigned int offset)
{
return readl_relaxed(base + offset);
}
static void u2o_set(void __iomem *base, unsigned int offset,
unsigned int value)
{
u32 reg;
reg = readl_relaxed(base + offset);
reg |= value;
writel_relaxed(reg, base + offset);
readl_relaxed(base + offset);
}
static void u2o_clear(void __iomem *base, unsigned int offset,
unsigned int value)
{
u32 reg;
reg = readl_relaxed(base + offset);
reg &= ~value;
writel_relaxed(reg, base + offset);
readl_relaxed(base + offset);
}
static int mmp3_usb_phy_init(struct phy *phy)
{
struct mmp3_usb_phy *mmp3_usb_phy = phy_get_drvdata(phy);
void __iomem *base = mmp3_usb_phy->base;
if (cpu_is_mmp3_a0()) {
u2o_clear(base, USB2_PLL_REG0, (USB2_PLL_FBDIV_MASK_MMP3
| USB2_PLL_REFDIV_MASK_MMP3));
u2o_set(base, USB2_PLL_REG0,
0xd << USB2_PLL_REFDIV_SHIFT_MMP3
| 0xf0 << USB2_PLL_FBDIV_SHIFT_MMP3);
} else if (cpu_is_mmp3_b0()) {
u2o_clear(base, USB2_PLL_REG0, USB2_PLL_REFDIV_MASK_MMP3_B0
| USB2_PLL_FBDIV_MASK_MMP3_B0);
u2o_set(base, USB2_PLL_REG0,
0xd << USB2_PLL_REFDIV_SHIFT_MMP3_B0
| 0xf0 << USB2_PLL_FBDIV_SHIFT_MMP3_B0);
} else {
dev_err(&phy->dev, "unsupported silicon revision\n");
return -ENODEV;
}
u2o_clear(base, USB2_PLL_REG1, USB2_PLL_PU_PLL_MASK
| USB2_PLL_ICP_MASK_MMP3
| USB2_PLL_KVCO_MASK_MMP3
| USB2_PLL_CALI12_MASK_MMP3);
u2o_set(base, USB2_PLL_REG1, 1 << USB2_PLL_PU_PLL_SHIFT_MMP3
| 1 << USB2_PLL_LOCK_BYPASS_SHIFT_MMP3
| 3 << USB2_PLL_ICP_SHIFT_MMP3
| 3 << USB2_PLL_KVCO_SHIFT_MMP3
| 3 << USB2_PLL_CAL12_SHIFT_MMP3);
u2o_clear(base, USB2_TX_REG0, USB2_TX_IMPCAL_VTH_MASK_MMP3);
u2o_set(base, USB2_TX_REG0, 2 << USB2_TX_IMPCAL_VTH_SHIFT_MMP3);
u2o_clear(base, USB2_TX_REG1, USB2_TX_VDD12_MASK_MMP3
| USB2_TX_AMP_MASK_MMP3
| USB2_TX_CK60_PHSEL_MASK_MMP3);
u2o_set(base, USB2_TX_REG1, 3 << USB2_TX_VDD12_SHIFT_MMP3
| 4 << USB2_TX_AMP_SHIFT_MMP3
| 4 << USB2_TX_CK60_PHSEL_SHIFT_MMP3);
u2o_clear(base, USB2_TX_REG2, 3 << USB2_TX_DRV_SLEWRATE_SHIFT);
u2o_set(base, USB2_TX_REG2, 2 << USB2_TX_DRV_SLEWRATE_SHIFT);
u2o_clear(base, USB2_RX_REG0, USB2_RX_SQ_THRESH_MASK_MMP3);
u2o_set(base, USB2_RX_REG0, 0xa << USB2_RX_SQ_THRESH_SHIFT_MMP3);
u2o_set(base, USB2_ANA_REG1, 0x1 << USB2_ANA_PU_ANA_SHIFT_MMP3);
u2o_set(base, USB2_OTG_REG0, 0x1 << USB2_OTG_PU_OTG_SHIFT_MMP3);
return 0;
}
static int mmp3_usb_phy_calibrate(struct phy *phy)
{
struct mmp3_usb_phy *mmp3_usb_phy = phy_get_drvdata(phy);
void __iomem *base = mmp3_usb_phy->base;
int loops;
/*
* PLL VCO and TX Impedance Calibration Timing:
*
* _____________________________________
* PU __________|
* _____________________________
* VCOCAL START _________|
* ___
* REG_RCAL_START ________________| |________|_______
* | 200us | 400us | 40| 400us | USB PHY READY
*/
udelay(200);
u2o_set(base, USB2_PLL_REG1, 1 << USB2_PLL_VCOCAL_START_SHIFT_MMP3);
udelay(400);
u2o_set(base, USB2_TX_REG0, 1 << USB2_TX_RCAL_START_SHIFT_MMP3);
udelay(40);
u2o_clear(base, USB2_TX_REG0, 1 << USB2_TX_RCAL_START_SHIFT_MMP3);
udelay(400);
loops = 0;
while ((u2o_get(base, USB2_PLL_REG1) & USB2_PLL_READY_MASK_MMP3) == 0) {
mdelay(1);
loops++;
if (loops > 100) {
dev_err(&phy->dev, "PLL_READY not set after 100mS.\n");
return -ETIMEDOUT;
}
}
return 0;
}
static const struct phy_ops mmp3_usb_phy_ops = {
.init = mmp3_usb_phy_init,
.calibrate = mmp3_usb_phy_calibrate,
.owner = THIS_MODULE,
};
static const struct of_device_id mmp3_usb_phy_of_match[] = {
{ .compatible = "marvell,mmp3-usb-phy", },
{ },
};
MODULE_DEVICE_TABLE(of, mmp3_usb_phy_of_match);
static int mmp3_usb_phy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mmp3_usb_phy *mmp3_usb_phy;
struct phy_provider *provider;
mmp3_usb_phy = devm_kzalloc(dev, sizeof(*mmp3_usb_phy), GFP_KERNEL);
if (!mmp3_usb_phy)
return -ENOMEM;
mmp3_usb_phy->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mmp3_usb_phy->base)) {
dev_err(dev, "failed to remap PHY regs\n");
return PTR_ERR(mmp3_usb_phy->base);
}
mmp3_usb_phy->phy = devm_phy_create(dev, NULL, &mmp3_usb_phy_ops);
if (IS_ERR(mmp3_usb_phy->phy)) {
dev_err(dev, "failed to create PHY\n");
return PTR_ERR(mmp3_usb_phy->phy);
}
phy_set_drvdata(mmp3_usb_phy->phy, mmp3_usb_phy);
provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
if (IS_ERR(provider)) {
dev_err(dev, "failed to register PHY provider\n");
return PTR_ERR(provider);
}
return 0;
}
static struct platform_driver mmp3_usb_phy_driver = {
.probe = mmp3_usb_phy_probe,
.driver = {
.name = "mmp3-usb-phy",
.of_match_table = mmp3_usb_phy_of_match,
},
};
module_platform_driver(mmp3_usb_phy_driver);
MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
MODULE_DESCRIPTION("Marvell MMP3 USB PHY Driver");
MODULE_LICENSE("GPL v2");
