#include <linux/delay.h>
#include <linux/io.h>
#include <linux/iopoll.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_CTRL,
PHY_CTRL,
PHY_PLL_CTRL,
};
static const u8 bcm_usb_combo_phy_ss[] = {
[PLL_CTRL] = 0x18,
[PHY_CTRL] = 0x14,
};
static const u8 bcm_usb_combo_phy_hs[] = {
[PLL_CTRL] = 0x0c,
[PHY_CTRL] = 0x10,
};
static const u8 bcm_usb_hs_phy[] = {
[PLL_CTRL] = 0x8,
[PHY_CTRL] = 0xc,
};
enum pll_ctrl_bits {
PLL_RESETB,
SSPLL_SUSPEND_EN,
PLL_SEQ_START,
PLL_LOCK,
};
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_RESETB] = 5,
[PLL_LOCK] = 6,
};
enum bcm_usb_phy_ctrl_bits {
CORERDY,
PHY_RESETB,
PHY_PCTL,
};
#define PHY_PCTL_MASK 0xffff
#define SSPHY_PCTL_VAL 0x0006
static const u8 u3phy_ctrl[] = {
[PHY_RESETB] = 1,
[PHY_PCTL] = 2,
};
static const u8 u2phy_ctrl[] = {
[CORERDY] = 0,
[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)
{
u32 data;
int ret;
ret = readl_poll_timeout_atomic(addr, data, (data & bit), 1,
PLL_LOCK_RETRY_COUNT);
if (ret)
pr_err("%s: FAIL\n", __func__);
return ret;
}
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;
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]));
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;
offset = phy_cfg->offset;
bcm_usb_reg32_clrbits(regs + offset[PLL_CTRL],
BIT(u2pll_ctrl[PLL_RESETB]));
bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
BIT(u2pll_ctrl[PLL_RESETB]));
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 const 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,
},
{ },
};
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;
void __iomem *regs;
int ret;
enum bcm_usb_phy_version version;
struct phy_provider *phy_provider;
regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(regs))
return PTR_ERR(regs);
of_id = of_match_node(bcm_usb_phy_of_match, dn);
if (of_id)
version = (uintptr_t)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"