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Subject[PATCH v2 2/3] phy: sr-usb: Add stingray usb phy driver
Date
This driver supports all versions of stingray SS and HS
USB phys.
In version 1 is combo phy contain both SS and HS phys
in a common IO space.
In version 2 a single HS phy.
These phys support both xHCI host driver and
BDC Broadcom device controller driver.

Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
---
drivers/phy/broadcom/Kconfig | 11 +
drivers/phy/broadcom/Makefile | 1 +
drivers/phy/broadcom/phy-bcm-sr-usb.c | 373 ++++++++++++++++++++++++++++++++++
3 files changed, 385 insertions(+)
create mode 100644 drivers/phy/broadcom/phy-bcm-sr-usb.c

diff --git a/drivers/phy/broadcom/Kconfig b/drivers/phy/broadcom/Kconfig
index 8786a96..c1e4dd5 100644
--- a/drivers/phy/broadcom/Kconfig
+++ b/drivers/phy/broadcom/Kconfig
@@ -10,6 +10,17 @@ config PHY_CYGNUS_PCIE
Enable this to support the Broadcom Cygnus PCIe PHY.
If unsure, say N.

+config PHY_BCM_SR_USB
+ tristate "Broadcom Stingray USB PHY driver"
+ depends on OF && (ARCH_BCM_IPROC || COMPILE_TEST)
+ select GENERIC_PHY
+ default ARCH_BCM_IPROC
+ help
+ Enable this to support the Broadcom Stingray USB PHY
+ driver. It supports all versions of Superspeed and
+ Highspeed PHYs.
+ If unsure, say N.
+
config BCM_KONA_USB2_PHY
tristate "Broadcom Kona USB2 PHY Driver"
depends on HAS_IOMEM
diff --git a/drivers/phy/broadcom/Makefile b/drivers/phy/broadcom/Makefile
index 0f60184..f453c7d 100644
--- a/drivers/phy/broadcom/Makefile
+++ b/drivers/phy/broadcom/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_PHY_BRCM_USB) += phy-brcm-usb-dvr.o
phy-brcm-usb-dvr-objs := phy-brcm-usb.o phy-brcm-usb-init.o

obj-$(CONFIG_PHY_BCM_SR_PCIE) += phy-bcm-sr-pcie.o
+obj-$(CONFIG_PHY_BCM_SR_USB) += phy-bcm-sr-usb.o
diff --git a/drivers/phy/broadcom/phy-bcm-sr-usb.c b/drivers/phy/broadcom/phy-bcm-sr-usb.c
new file mode 100644
index 0000000..52484b3
--- /dev/null
+++ b/drivers/phy/broadcom/phy-bcm-sr-usb.c
@@ -0,0 +1,373 @@
+// 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_USB_PHY_V1,
+ BCM_USB_PHY_V2,
+};
+
+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_u3phy_v1[] = {
+ [PLL_CTRL] = 0x18,
+ [PHY_CTRL] = 0x14,
+};
+
+static const u8 bcm_usb_u2phy_v1[] = {
+ [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_u2phy_v2[] = {
+ [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 ver;
+ 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,
+};
+
+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 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;
+ struct phy_provider *phy_provider;
+
+ phy_cfg = devm_kzalloc(dev, sizeof(struct bcm_usb_phy_cfg), GFP_KERNEL);
+ if (!phy_cfg)
+ return -ENOMEM;
+
+ phy_cfg->regs = regs;
+ phy_cfg->ver = version;
+
+ if (phy_cfg->ver == BCM_USB_PHY_V1) {
+ unsigned int id;
+
+ if (of_property_read_u32(node, "reg", &id)) {
+ dev_err(dev, "missing reg property in node %s\n",
+ node->name);
+ return -EINVAL;
+ }
+
+ if (id == 0) {
+ phy_cfg->offset = bcm_usb_u2phy_v1;
+ phy_cfg->type = USB_HS_PHY;
+ } else if (id == 1) {
+ phy_cfg->offset = bcm_usb_u3phy_v1;
+ phy_cfg->type = USB_SS_PHY;
+ } else {
+ return -ENODEV;
+ }
+ } else if (phy_cfg->ver == BCM_USB_PHY_V2) {
+ phy_cfg->offset = bcm_usb_u2phy_v2;
+ 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);
+ phy_provider = devm_of_phy_provider_register(&phy_cfg->phy->dev,
+ of_phy_simple_xlate);
+ if (IS_ERR(phy_provider)) {
+ dev_err(dev, "Failed to register phy provider\n");
+ return PTR_ERR(phy_provider);
+ }
+
+ return 0;
+}
+
+static const struct of_device_id bcm_usb_phy_of_match[] = {
+ {
+ .compatible = "brcm,sr-usb-phy",
+ .data = (void *)BCM_USB_PHY_V1,
+ },
+ {
+ .compatible = "brcm,sr-usb-phy-v2",
+ .data = (void *)BCM_USB_PHY_V2,
+ },
+ { /* 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, *child;
+ const struct of_device_id *of_id;
+ struct resource *res;
+ void __iomem *regs;
+ int ret;
+ enum bcm_usb_phy_version version;
+
+ 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;
+
+ if (of_get_child_count(dn) == 0)
+ return bcm_usb_phy_create(dev, dn, regs, version);
+
+ for_each_available_child_of_node(dn, child) {
+ ret = bcm_usb_phy_create(dev, child, regs, version);
+ if (ret) {
+ of_node_put(child);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+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");
--
2.7.4
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