phy: add support for stingray PAXB PHY controller

Add support for stingray PAXB PHY controller driver.
This driver supports maximum 8 PAXB phys using pipemux data.

Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Reviewed-by: Stefan Roese <sr@denx.de>

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 8da00a259d7b500d784cbeb7a5d990471a8bbf54..d66aa0739279b202bf32a6fdca0483fd4078ff1e 100644 (file)
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -84,6 +84,13 @@ config BCM6368_USBH_PHY
        help
          Support for the Broadcom MIPS BCM6368 USBH PHY.
 
+config BCM_SR_PCIE_PHY
+       bool "Broadcom Stingray PCIe PHY driver"
+       depends on PHY
+       help
+         Enable this to support the Broadcom Stingray PCIe PHY
+         If unsure, say N.
+
 config PHY_DA8XX_USB
        tristate "TI DA8xx USB PHY Driver"
        depends on PHY && ARCH_DAVINCI

diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 009f353baf4d954ab14a295ac6364a25fb4946d3..8dabefd776ab8a5c6ea5c8f2fd9b357d0ec276ff 100644 (file)
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_BCM6318_USBH_PHY) += bcm6318-usbh-phy.o
 obj-$(CONFIG_BCM6348_USBH_PHY) += bcm6348-usbh-phy.o
 obj-$(CONFIG_BCM6358_USBH_PHY) += bcm6358-usbh-phy.o
 obj-$(CONFIG_BCM6368_USBH_PHY) += bcm6368-usbh-phy.o
+obj-$(CONFIG_BCM_SR_PCIE_PHY) += phy-bcm-sr-pcie.o
 obj-$(CONFIG_PHY_SANDBOX) += sandbox-phy.o
 obj-$(CONFIG_$(SPL_)PIPE3_PHY) += ti-pipe3-phy.o
 obj-$(CONFIG_AM654_PHY) += phy-ti-am654.o

diff --git a/drivers/phy/phy-bcm-sr-pcie.c b/drivers/phy/phy-bcm-sr-pcie.c
new file mode 100644 (file)
index 0000000..36c77c4
--- /dev/null
+++ b/drivers/phy/phy-bcm-sr-pcie.c
@@ -0,0 +1,177 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 Broadcom
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <asm/io.h>
+#include <linux/bitops.h>
+
+/* we have up to 8 PAXB based RC. The 9th one is always PAXC */
+#define SR_NR_PCIE_PHYS               8
+
+#define PCIE_PIPEMUX_CFG_OFFSET       0x10c
+#define PCIE_PIPEMUX_SELECT_STRAP     GENMASK(3, 0)
+
+#define CDRU_STRAP_DATA_LSW_OFFSET    0x5c
+#define PCIE_PIPEMUX_SHIFT            19
+#define PCIE_PIPEMUX_MASK             GENMASK(3, 0)
+
+/**
+ * struct sr_pcie_phy_core - Stingray PCIe PHY core control
+ *
+ * @dev: pointer to device
+ * @base: base register of PCIe SS
+ * @cdru: CDRU base address
+ * @pipemux: pipemuex strap
+ */
+struct sr_pcie_phy_core {
+       struct udevice *dev;
+       void __iomem *base;
+       void __iomem *cdru;
+       u32 pipemux;
+};
+
+/*
+ * PCIe PIPEMUX lookup table
+ *
+ * Each array index represents a PIPEMUX strap setting
+ * The array element represents a bitmap where a set bit means the PCIe
+ * core and associated serdes has been enabled as RC and is available for use
+ */
+static const u8 pipemux_table[] = {
+       /* PIPEMUX = 0, EP 1x16 */
+       0x00,
+       /* PIPEMUX = 1, EP 1x8 + RC 1x8, core 7 */
+       0x80,
+       /* PIPEMUX = 2, EP 4x4 */
+       0x00,
+       /* PIPEMUX = 3, RC 2x8, cores 0, 7 */
+       0x81,
+       /* PIPEMUX = 4, RC 4x4, cores 0, 1, 6, 7 */
+       0xc3,
+       /* PIPEMUX = 5, RC 8x2, all 8 cores */
+       0xff,
+       /* PIPEMUX = 6, RC 3x4 + 2x2, cores 0, 2, 3, 6, 7 */
+       0xcd,
+       /* PIPEMUX = 7, RC 1x4 + 6x2, cores 0, 2, 3, 4, 5, 6, 7 */
+       0xfd,
+       /* PIPEMUX = 8, EP 1x8 + RC 4x2, cores 4, 5, 6, 7 */
+       0xf0,
+       /* PIPEMUX = 9, EP 1x8 + RC 2x4, cores 6, 7 */
+       0xc0,
+       /* PIPEMUX = 10, EP 2x4 + RC 2x4, cores 1, 6 */
+       0x42,
+       /* PIPEMUX = 11, EP 2x4 + RC 4x2, cores 2, 3, 4, 5 */
+       0x3c,
+       /* PIPEMUX = 12, EP 1x4 + RC 6x2, cores 2, 3, 4, 5, 6, 7 */
+       0xfc,
+       /* PIPEMUX = 13, RC 2x4 + RC 1x4 + 2x2, cores 2, 3, 6 */
+       0x4c,
+};
+
+/*
+ * Return true if the strap setting is valid
+ */
+static bool pipemux_strap_is_valid(u32 pipemux)
+{
+       return !!(pipemux < ARRAY_SIZE(pipemux_table));
+}
+
+/*
+ * Read the PCIe PIPEMUX from strap
+ */
+static u32 pipemux_strap_read(struct sr_pcie_phy_core *core)
+{
+       u32 pipemux;
+
+       /*
+        * Read PIPEMUX configuration register to determine the pipemux setting
+        *
+        * In the case when the value indicates using HW strap, fall back to
+        * use HW strap
+        */
+       pipemux = readl(core->base + PCIE_PIPEMUX_CFG_OFFSET);
+       pipemux &= PCIE_PIPEMUX_MASK;
+       if (pipemux == PCIE_PIPEMUX_SELECT_STRAP) {
+               pipemux = readl(core->cdru + CDRU_STRAP_DATA_LSW_OFFSET);
+               pipemux >>= PCIE_PIPEMUX_SHIFT;
+               pipemux &= PCIE_PIPEMUX_MASK;
+       }
+
+       return pipemux;
+}
+
+static int sr_pcie_phy_init(struct phy *phy)
+{
+       struct sr_pcie_phy_core *core = dev_get_priv(phy->dev);
+       unsigned int core_idx = phy->id;
+
+       debug("%s %lx\n", __func__, phy->id);
+       /*
+        * Check whether this PHY is for root complex or not. If yes, return
+        * zero so the host driver can proceed to enumeration. If not, return
+        * an error and that will force the host driver to bail out
+        */
+       if (!!((pipemux_table[core->pipemux] >> core_idx) & 0x1))
+               return 0;
+
+       return -ENODEV;
+}
+
+static int sr_pcie_phy_xlate(struct phy *phy, struct ofnode_phandle_args *args)
+{
+       debug("%s %d\n", __func__, args->args[0]);
+       if (args->args_count && args->args[0] < SR_NR_PCIE_PHYS)
+               phy->id = args->args[0];
+       else
+               return -ENODEV;
+
+       return 0;
+}
+
+static const struct phy_ops sr_pcie_phy_ops = {
+       .of_xlate = sr_pcie_phy_xlate,
+       .init = sr_pcie_phy_init,
+};
+
+static int sr_pcie_phy_probe(struct udevice *dev)
+{
+       struct sr_pcie_phy_core *core = dev_get_priv(dev);
+
+       core->dev = dev;
+
+       core->base = (void __iomem *)devfdt_get_addr_name(dev, "reg_base");
+       core->cdru = (void __iomem *)devfdt_get_addr_name(dev, "cdru_base");
+       debug("ip base %p\n", core->base);
+       debug("cdru base %p\n", core->cdru);
+
+       /* read the PCIe PIPEMUX strap setting */
+       core->pipemux = pipemux_strap_read(core);
+       if (!pipemux_strap_is_valid(core->pipemux)) {
+               pr_err("invalid PCIe PIPEMUX strap %u\n", core->pipemux);
+               return -EIO;
+       }
+       debug("%s %#x\n", __func__, core->pipemux);
+
+       pr_info("Stingray PCIe PHY driver initialized\n");
+
+       return 0;
+}
+
+static const struct udevice_id sr_pcie_phy_match_table[] = {
+       { .compatible = "brcm,sr-pcie-phy" },
+       { }
+};
+
+U_BOOT_DRIVER(sr_pcie_phy) = {
+       .name = "sr-pcie-phy",
+       .id = UCLASS_PHY,
+       .probe = sr_pcie_phy_probe,
+       .of_match = sr_pcie_phy_match_table,
+       .ops = &sr_pcie_phy_ops,
+       .platdata_auto_alloc_size = sizeof(struct sr_pcie_phy_core),
+       .priv_auto_alloc_size = sizeof(struct sr_pcie_phy_core),
+};