[PATCH v2 4/5] phy: add Broadcom SATA3 PHY driver for Broadcom STB SoCs

Brian Norris
2015-04-23T02:59:09Z

Supports up to two ports which can each be powered on/off and configured
independently.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---
v2:
- stop sharing SATA_TOP_CTRL registers with SATA driver
- kill custom xlate function

drivers/phy/Kconfig | 9 ++
drivers/phy/Makefile | 1 +
drivers/phy/phy-brcmstb-sata.c | 216 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 226 insertions(+)
create mode 100644 drivers/phy/phy-brcmstb-sata.c

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 2962de205ba7..c8b22074bcf6 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -291,4 +291,13 @@ config PHY_QCOM_UFS
help
Support for UFS PHY on QCOM chipsets.

+config PHY_BRCMSTB_SATA
+ tristate "Broadcom STB SATA PHY driver"
+ depends on ARCH_BRCMSTB
+ depends on OF
+ select GENERIC_PHY
+ help
+ Enable this to support the SATA3 PHY on 28nm Broadcom STB SoCs.
+ Likely useful only with CONFIG_SATA_BRCMSTB enabled.
+
endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index f080e1bb2a74..28a10804b4f4 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -38,3 +38,4 @@ obj-$(CONFIG_PHY_STIH41X_USB) += phy-stih41x-usb.o
obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs.o
obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs-qmp-20nm.o
obj-$(CONFIG_PHY_QCOM_UFS) += phy-qcom-ufs-qmp-14nm.o
+obj-$(CONFIG_PHY_BRCMSTB_SATA) += phy-brcmstb-sata.o
diff --git a/drivers/phy/phy-brcmstb-sata.c b/drivers/phy/phy-brcmstb-sata.c
new file mode 100644
index 000000000000..8387c8cbea8c
--- /dev/null
+++ b/drivers/phy/phy-brcmstb-sata.c
@@ -0,0 +1,216 @@
+/*
+ * Broadcom SATA3 AHCI Controller PHY Driver
+ *
+ * Copyright ? 2009-2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#define SATA_MDIO_BANK_OFFSET 0x23c
+#define SATA_MDIO_REG_OFFSET(ofs) ((ofs) * 4)
+#define SATA_MDIO_REG_SPACE_SIZE 0x1000
+#define SATA_MDIO_REG_LENGTH 0x1f00
+
+#define MAX_PORTS 2
+
+/* Register offset between PHYs in PCB space */
+#define SATA_MDIO_REG_SPACE_SIZE 0x1000
+
+struct brcm_sata_port {
+ int portnum;
+ struct phy *phy;
+ struct brcm_sata_phy *phy_priv;
+ bool ssc_en;
+};
+
+struct brcm_sata_phy {
+ struct device *dev;
+ void __iomem *phy_base;
+
+ struct brcm_sata_port phys[MAX_PORTS];
+};
+
+enum sata_mdio_phy_regs_28nm {
+ PLL_REG_BANK_0 = 0x50,
+ PLL_REG_BANK_0_PLLCONTROL_0 = 0x81,
+
+ TXPMD_REG_BANK = 0x1a0,
+ TXPMD_CONTROL1 = 0x81,
+ TXPMD_CONTROL1_TX_SSC_EN_FRC = BIT(0),
+ TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL = BIT(1),
+ TXPMD_TX_FREQ_CTRL_CONTROL1 = 0x82,
+ TXPMD_TX_FREQ_CTRL_CONTROL2 = 0x83,
+ TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK = 0x3ff,
+ TXPMD_TX_FREQ_CTRL_CONTROL3 = 0x84,
+ TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK = 0x3ff,
+};
+
+static inline void __iomem *brcm_sata_phy_base(struct brcm_sata_port *port)
+{
+ struct brcm_sata_phy *priv = port->phy_priv;
+
+ return priv->phy_base + (port->portnum * SATA_MDIO_REG_SPACE_SIZE);
+}
+
+static void brcm_sata_mdio_wr(void __iomem *addr, u32 bank, u32 ofs,
+ u32 msk, u32 value)
+{
+ u32 tmp;
+
+ writel(bank, addr + SATA_MDIO_BANK_OFFSET);
+ tmp = readl(addr + SATA_MDIO_REG_OFFSET(ofs));
+ tmp = (tmp & msk) | value;
+ writel(tmp, addr + SATA_MDIO_REG_OFFSET(ofs));
+}
+
+/* These defaults were characterized by H/W group */
+#define FMIN_VAL_DEFAULT 0x3df
+#define FMAX_VAL_DEFAULT 0x3df
+#define FMAX_VAL_SSC 0x83
+
+static void cfg_ssc_28nm(struct brcm_sata_port *port)
+{
+ void __iomem *base = brcm_sata_phy_base(port);
+ struct brcm_sata_phy *priv = port->phy_priv;
+ u32 tmp;
+
+ /* override the TX spread spectrum setting */
+ tmp = TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL | TXPMD_CONTROL1_TX_SSC_EN_FRC;
+ brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_CONTROL1, ~tmp, tmp);
+
+ /* set fixed min freq */
+ brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL2,
+ ~TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK,
+ FMIN_VAL_DEFAULT);
+
+ /* set fixed max freq depending on SSC config */
+ if (port->ssc_en) {
+ dev_info(priv->dev, "enabling SSC on port %d\n", port->portnum);
+ tmp = FMAX_VAL_SSC;
+ } else {
+ tmp = FMAX_VAL_DEFAULT;
+ }
+
+ brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL3,
+ ~TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK, tmp);
+}
+
+static int brcm_sata_phy_init(struct phy *phy)
+{
+ struct brcm_sata_port *port = phy_get_drvdata(phy);
+
+ cfg_ssc_28nm(port);
+
+ return 0;
+}
+
+static struct phy_ops phy_ops_28nm = {
+ .init = brcm_sata_phy_init,
+ .owner = THIS_MODULE,
+};
+
+static const struct of_device_id brcm_sata_phy_of_match[] = {
+ { .compatible = "brcm,bcm7445-sata-phy" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, brcm_sata_phy_of_match);
+
+static int brcm_sata_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *dn = dev->of_node, *child;
+ struct brcm_sata_phy *priv;
+ struct resource *res;
+ struct phy_provider *provider;
+ int count = 0;
+
+ if (of_get_child_count(dn) == 0)
+ return -ENODEV;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ dev_set_drvdata(dev, priv);
+ priv->dev = dev;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
+ priv->phy_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->phy_base))
+ return PTR_ERR(priv->phy_base);
+
+ for_each_available_child_of_node(dn, child) {
+ unsigned int id;
+ struct brcm_sata_port *port;
+
+ if (of_property_read_u32(child, "reg", &id)) {
+ dev_err(dev, "missing reg property in node %s\n",
+ child->name);
+ return -EINVAL;
+ }
+
+ if (id >= MAX_PORTS) {
+ dev_err(dev, "invalid reg: %u\n", id);
+ return -EINVAL;
+ }
+ if (priv->phys[id].phy) {
+ dev_err(dev, "already registered port %u\n", id);
+ return -EINVAL;
+ }
+
+ port = &priv->phys[id];
+ port->portnum = id;
+ port->phy_priv = priv;
+ port->phy = devm_phy_create(dev, child, &phy_ops_28nm);
+ port->ssc_en = of_property_read_bool(child, "brcm,enable-ssc");
+ if (IS_ERR(port->phy)) {
+ dev_err(dev, "failed to create PHY\n");
+ return PTR_ERR(port->phy);
+ }
+
+ phy_set_drvdata(port->phy, port);
+ count++;
+ }
+
+ provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+ if (IS_ERR(provider)) {
+ dev_err(dev, "could not register PHY provider\n");
+ return PTR_ERR(provider);
+ }
+
+ dev_info(dev, "registered %d port(s)\n", count);
+
+ return 0;
+}
+
+static struct platform_driver brcm_sata_phy_driver = {
+ .probe = brcm_sata_phy_probe,
+ .driver = {
+ .of_match_table = brcm_sata_phy_of_match,
+ .name = "brcmstb-sata-phy",
+ }
+};
+module_platform_driver(brcm_sata_phy_driver);
+
+MODULE_DESCRIPTION("Broadcom STB SATA PHY driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marc Carino");
+MODULE_AUTHOR("Brian Norris");
+MODULE_ALIAS("platform:phy-brcmstb-sata");
--
1.9.1