renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-22 12:14:01 +08:00
Code
3793faad7b
linux-next/drivers/phy/broadcom/phy-bcm-sr-usb.c
Srinath Mannam 4dcddbb38b phy: sr-usb: Add Stingray USB PHY driver 
USB PHY driver supports two types of stingray USB PHYs
 - Type 1 is a combo PHY contains two PHYs, one SS and one HS.
 - Type 2 is a single HS PHY.

These two PHY versons support both Generic xHCI host controller driver
and BDC Broadcom device controller driver.

Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
2019-04-17 14:12:48 +05:30

395 lines
8.5 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016-2018 Broadcom
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
enum bcm_usb_phy_version {
BCM_SR_USB_COMBO_PHY,
BCM_SR_USB_HS_PHY,
};
enum bcm_usb_phy_reg {
PLL_NDIV_FRAC,
PLL_NDIV_INT,
PLL_CTRL,
PHY_CTRL,
PHY_PLL_CTRL,
};
/* USB PHY registers */
static const u8 bcm_usb_combo_phy_ss[] = {
[PLL_CTRL] = 0x18,
[PHY_CTRL] = 0x14,
};
static const u8 bcm_usb_combo_phy_hs[] = {
[PLL_NDIV_FRAC] = 0x04,
[PLL_NDIV_INT] = 0x08,
[PLL_CTRL] = 0x0c,
[PHY_CTRL] = 0x10,
};
#define HSPLL_NDIV_INT_VAL 0x13
#define HSPLL_NDIV_FRAC_VAL 0x1005
static const u8 bcm_usb_hs_phy[] = {
[PLL_NDIV_FRAC] = 0x0,
[PLL_NDIV_INT] = 0x4,
[PLL_CTRL] = 0x8,
[PHY_CTRL] = 0xc,
};
enum pll_ctrl_bits {
PLL_RESETB,
SSPLL_SUSPEND_EN,
PLL_SEQ_START,
PLL_LOCK,
PLL_PDIV,
};
static const u8 u3pll_ctrl[] = {
[PLL_RESETB] = 0,
[SSPLL_SUSPEND_EN] = 1,
[PLL_SEQ_START] = 2,
[PLL_LOCK] = 3,
};
#define HSPLL_PDIV_MASK 0xF
#define HSPLL_PDIV_VAL 0x1
static const u8 u2pll_ctrl[] = {
[PLL_PDIV] = 1,
[PLL_RESETB] = 5,
[PLL_LOCK] = 6,
};
enum bcm_usb_phy_ctrl_bits {
CORERDY,
AFE_LDO_PWRDWNB,
AFE_PLL_PWRDWNB,
AFE_BG_PWRDWNB,
PHY_ISO,
PHY_RESETB,
PHY_PCTL,
};
#define PHY_PCTL_MASK 0xffff
/*
* 0x0806 of PCTL_VAL has below bits set
* BIT-8 : refclk divider 1
* BIT-3:2: device mode; mode is not effect
* BIT-1: soft reset active low
*/
#define HSPHY_PCTL_VAL 0x0806
#define SSPHY_PCTL_VAL 0x0006
static const u8 u3phy_ctrl[] = {
[PHY_RESETB] = 1,
[PHY_PCTL] = 2,
};
static const u8 u2phy_ctrl[] = {
[CORERDY] = 0,
[AFE_LDO_PWRDWNB] = 1,
[AFE_PLL_PWRDWNB] = 2,
[AFE_BG_PWRDWNB] = 3,
[PHY_ISO] = 4,
[PHY_RESETB] = 5,
[PHY_PCTL] = 6,
};
struct bcm_usb_phy_cfg {
uint32_t type;
uint32_t version;
void __iomem *regs;
struct phy *phy;
const u8 *offset;
};
#define PLL_LOCK_RETRY_COUNT 1000
enum bcm_usb_phy_type {
USB_HS_PHY,
USB_SS_PHY,
};
#define NUM_BCM_SR_USB_COMBO_PHYS 2
static inline void bcm_usb_reg32_clrbits(void __iomem *addr, uint32_t clear)
{
writel(readl(addr) & ~clear, addr);
}
static inline void bcm_usb_reg32_setbits(void __iomem *addr, uint32_t set)
{
writel(readl(addr) | set, addr);
}
static int bcm_usb_pll_lock_check(void __iomem *addr, u32 bit)
{
int retry;
u32 rd_data;
retry = PLL_LOCK_RETRY_COUNT;
do {
rd_data = readl(addr);
if (rd_data & bit)
return 0;
udelay(1);
} while (--retry > 0);
pr_err("%s: FAIL\n", __func__);
return -ETIMEDOUT;
}
static int bcm_usb_ss_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
{
int ret = 0;
void __iomem *regs = phy_cfg->regs;
const u8 *offset;
u32 rd_data;
offset = phy_cfg->offset;
/* Set pctl with mode and soft reset */
rd_data = readl(regs + offset[PHY_CTRL]);
rd_data &= ~(PHY_PCTL_MASK << u3phy_ctrl[PHY_PCTL]);
rd_data |= (SSPHY_PCTL_VAL << u3phy_ctrl[PHY_PCTL]);
writel(rd_data, regs + offset[PHY_CTRL]);
bcm_usb_reg32_clrbits(regs + offset[PLL_CTRL],
BIT(u3pll_ctrl[SSPLL_SUSPEND_EN]));
bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
BIT(u3pll_ctrl[PLL_SEQ_START]));
bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
BIT(u3pll_ctrl[PLL_RESETB]));
/* Maximum timeout for PLL reset done */
msleep(30);
ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
BIT(u3pll_ctrl[PLL_LOCK]));
return ret;
}
static int bcm_usb_hs_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
{
int ret = 0;
void __iomem *regs = phy_cfg->regs;
const u8 *offset;
u32 rd_data;
offset = phy_cfg->offset;
writel(HSPLL_NDIV_INT_VAL, regs + offset[PLL_NDIV_INT]);
writel(HSPLL_NDIV_FRAC_VAL, regs + offset[PLL_NDIV_FRAC]);
rd_data = readl(regs + offset[PLL_CTRL]);
rd_data &= ~(HSPLL_PDIV_MASK << u2pll_ctrl[PLL_PDIV]);
rd_data |= (HSPLL_PDIV_VAL << u2pll_ctrl[PLL_PDIV]);
writel(rd_data, regs + offset[PLL_CTRL]);
/* Set Core Ready high */
bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
BIT(u2phy_ctrl[CORERDY]));
/* Maximum timeout for Core Ready done */
msleep(30);
bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
BIT(u2pll_ctrl[PLL_RESETB]));
bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
BIT(u2phy_ctrl[PHY_RESETB]));
rd_data = readl(regs + offset[PHY_CTRL]);
rd_data &= ~(PHY_PCTL_MASK << u2phy_ctrl[PHY_PCTL]);
rd_data |= (HSPHY_PCTL_VAL << u2phy_ctrl[PHY_PCTL]);
writel(rd_data, regs + offset[PHY_CTRL]);
/* Maximum timeout for PLL reset done */
msleep(30);
ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
BIT(u2pll_ctrl[PLL_LOCK]));
return ret;
}
static int bcm_usb_phy_reset(struct phy *phy)
{
struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
void __iomem *regs = phy_cfg->regs;
const u8 *offset;
offset = phy_cfg->offset;
if (phy_cfg->type == USB_HS_PHY) {
bcm_usb_reg32_clrbits(regs + offset[PHY_CTRL],
BIT(u2phy_ctrl[CORERDY]));
bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
BIT(u2phy_ctrl[CORERDY]));
}
return 0;
}
static int bcm_usb_phy_init(struct phy *phy)
{
struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
int ret = -EINVAL;
if (phy_cfg->type == USB_SS_PHY)
ret = bcm_usb_ss_phy_init(phy_cfg);
else if (phy_cfg->type == USB_HS_PHY)
ret = bcm_usb_hs_phy_init(phy_cfg);
return ret;
}
static struct phy_ops sr_phy_ops = {
.init = bcm_usb_phy_init,
.reset = bcm_usb_phy_reset,
.owner = THIS_MODULE,
};
static struct phy *bcm_usb_phy_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct bcm_usb_phy_cfg *phy_cfg;
int phy_idx;
phy_cfg = dev_get_drvdata(dev);
if (!phy_cfg)
return ERR_PTR(-EINVAL);
if (phy_cfg->version == BCM_SR_USB_COMBO_PHY) {
phy_idx = args->args[0];
if (WARN_ON(phy_idx > 1))
return ERR_PTR(-ENODEV);
return phy_cfg[phy_idx].phy;
} else
return phy_cfg->phy;
}
static int bcm_usb_phy_create(struct device *dev, struct device_node *node,
void __iomem *regs, uint32_t version)
{
struct bcm_usb_phy_cfg *phy_cfg;
int idx;
if (version == BCM_SR_USB_COMBO_PHY) {
phy_cfg = devm_kzalloc(dev, NUM_BCM_SR_USB_COMBO_PHYS *
sizeof(struct bcm_usb_phy_cfg),
GFP_KERNEL);
if (!phy_cfg)
return -ENOMEM;
for (idx = 0; idx < NUM_BCM_SR_USB_COMBO_PHYS; idx++) {
phy_cfg[idx].regs = regs;
phy_cfg[idx].version = version;
if (idx == 0) {
phy_cfg[idx].offset = bcm_usb_combo_phy_hs;
phy_cfg[idx].type = USB_HS_PHY;
} else {
phy_cfg[idx].offset = bcm_usb_combo_phy_ss;
phy_cfg[idx].type = USB_SS_PHY;
}
phy_cfg[idx].phy = devm_phy_create(dev, node,
&sr_phy_ops);
if (IS_ERR(phy_cfg[idx].phy))
return PTR_ERR(phy_cfg[idx].phy);
phy_set_drvdata(phy_cfg[idx].phy, &phy_cfg[idx]);
}
} else if (version == BCM_SR_USB_HS_PHY) {
phy_cfg = devm_kzalloc(dev, sizeof(struct bcm_usb_phy_cfg),
GFP_KERNEL);
if (!phy_cfg)
return -ENOMEM;
phy_cfg->regs = regs;
phy_cfg->version = version;
phy_cfg->offset = bcm_usb_hs_phy;
phy_cfg->type = USB_HS_PHY;
phy_cfg->phy = devm_phy_create(dev, node, &sr_phy_ops);
if (IS_ERR(phy_cfg->phy))
return PTR_ERR(phy_cfg->phy);
phy_set_drvdata(phy_cfg->phy, phy_cfg);
} else
return -ENODEV;
dev_set_drvdata(dev, phy_cfg);
return 0;
}
static const struct of_device_id bcm_usb_phy_of_match[] = {
{
.compatible = "brcm,sr-usb-combo-phy",
.data = (void *)BCM_SR_USB_COMBO_PHY,
},
{
.compatible = "brcm,sr-usb-hs-phy",
.data = (void *)BCM_SR_USB_HS_PHY,
},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, bcm_usb_phy_of_match);
static int bcm_usb_phy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *dn = dev->of_node;
const struct of_device_id *of_id;
struct resource *res;
void __iomem *regs;
int ret;
enum bcm_usb_phy_version version;
struct phy_provider *phy_provider;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
regs = devm_ioremap_resource(dev, res);
if (IS_ERR(regs))
return PTR_ERR(regs);
of_id = of_match_node(bcm_usb_phy_of_match, dn);
if (of_id)
version = (enum bcm_usb_phy_version)of_id->data;
else
return -ENODEV;
ret = bcm_usb_phy_create(dev, dn, regs, version);
if (ret)
return ret;
phy_provider = devm_of_phy_provider_register(dev, bcm_usb_phy_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static struct platform_driver bcm_usb_phy_driver = {
.driver = {
.name = "phy-bcm-sr-usb",
.of_match_table = bcm_usb_phy_of_match,
},
.probe = bcm_usb_phy_probe,
};
module_platform_driver(bcm_usb_phy_driver);
MODULE_AUTHOR("Broadcom");
MODULE_DESCRIPTION("Broadcom stingray USB Phy driver");
MODULE_LICENSE("GPL v2");
View Git Blame Copy Permalink