--- /dev/null
+/*
+ * Qualcomm Atheros IPQ806x GMAC glue layer
+ *
+ * Copyright (C) 2015 The Linux Foundation
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/phy.h>
+#include <linux/regmap.h>
+#include <linux/clk.h>
+#include <linux/reset.h>
+#include <linux/of_net.h>
+#include <linux/mfd/syscon.h>
+#include <linux/stmmac.h>
+#include <linux/of_mdio.h>
+#include <linux/module.h>
+
+#include "stmmac_platform.h"
+
+#define NSS_COMMON_CLK_GATE 0x8
+#define NSS_COMMON_CLK_GATE_PTP_EN(x) BIT(0x10 + x)
+#define NSS_COMMON_CLK_GATE_RGMII_RX_EN(x) BIT(0x9 + (x * 2))
+#define NSS_COMMON_CLK_GATE_RGMII_TX_EN(x) BIT(0x8 + (x * 2))
+#define NSS_COMMON_CLK_GATE_GMII_RX_EN(x) BIT(0x4 + x)
+#define NSS_COMMON_CLK_GATE_GMII_TX_EN(x) BIT(0x0 + x)
+
+#define NSS_COMMON_CLK_DIV0 0xC
+#define NSS_COMMON_CLK_DIV_OFFSET(x) (x * 8)
+#define NSS_COMMON_CLK_DIV_MASK 0x7f
+
+#define NSS_COMMON_CLK_SRC_CTRL 0x14
+#define NSS_COMMON_CLK_SRC_CTRL_OFFSET(x) (1 << x)
+/* Mode is coded on 1 bit but is different depending on the MAC ID:
+ * MAC0: QSGMII=0 RGMII=1
+ * MAC1: QSGMII=0 SGMII=0 RGMII=1
+ * MAC2 & MAC3: QSGMII=0 SGMII=1
+ */
+#define NSS_COMMON_CLK_SRC_CTRL_RGMII(x) 1
+#define NSS_COMMON_CLK_SRC_CTRL_SGMII(x) ((x >= 2) ? 1 : 0)
+
+#define NSS_COMMON_MACSEC_CTL 0x28
+#define NSS_COMMON_MACSEC_CTL_EXT_BYPASS_EN(x) (1 << x)
+
+#define NSS_COMMON_GMAC_CTL(x) (0x30 + (x * 4))
+#define NSS_COMMON_GMAC_CTL_CSYS_REQ BIT(19)
+#define NSS_COMMON_GMAC_CTL_PHY_IFACE_SEL BIT(16)
+#define NSS_COMMON_GMAC_CTL_IFG_LIMIT_OFFSET 8
+#define NSS_COMMON_GMAC_CTL_IFG_OFFSET 0
+#define NSS_COMMON_GMAC_CTL_IFG_MASK 0x3f
+
+#define NSS_COMMON_CLK_DIV_RGMII_1000 1
+#define NSS_COMMON_CLK_DIV_RGMII_100 9
+#define NSS_COMMON_CLK_DIV_RGMII_10 99
+#define NSS_COMMON_CLK_DIV_SGMII_1000 0
+#define NSS_COMMON_CLK_DIV_SGMII_100 4
+#define NSS_COMMON_CLK_DIV_SGMII_10 49
+
+#define QSGMII_PCS_MODE_CTL 0x68
+#define QSGMII_PCS_MODE_CTL_AUTONEG_EN(x) BIT((x * 8) + 7)
+
+#define QSGMII_PCS_CAL_LCKDT_CTL 0x120
+#define QSGMII_PCS_CAL_LCKDT_CTL_RST BIT(19)
+
+/* Only GMAC1/2/3 support SGMII and their CTL register are not contiguous */
+#define QSGMII_PHY_SGMII_CTL(x) ((x == 1) ? 0x134 : \
+ (0x13c + (4 * (x - 2))))
+#define QSGMII_PHY_CDR_EN BIT(0)
+#define QSGMII_PHY_RX_FRONT_EN BIT(1)
+#define QSGMII_PHY_RX_SIGNAL_DETECT_EN BIT(2)
+#define QSGMII_PHY_TX_DRIVER_EN BIT(3)
+#define QSGMII_PHY_QSGMII_EN BIT(7)
+#define QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET 12
+#define QSGMII_PHY_PHASE_LOOP_GAIN_MASK 0x7
+#define QSGMII_PHY_RX_DC_BIAS_OFFSET 18
+#define QSGMII_PHY_RX_DC_BIAS_MASK 0x3
+#define QSGMII_PHY_RX_INPUT_EQU_OFFSET 20
+#define QSGMII_PHY_RX_INPUT_EQU_MASK 0x3
+#define QSGMII_PHY_CDR_PI_SLEW_OFFSET 22
+#define QSGMII_PHY_CDR_PI_SLEW_MASK 0x3
+#define QSGMII_PHY_TX_DRV_AMP_OFFSET 28
+#define QSGMII_PHY_TX_DRV_AMP_MASK 0xf
+
+struct ipq806x_gmac {
+ struct platform_device *pdev;
+ struct regmap *nss_common;
+ struct regmap *qsgmii_csr;
+ uint32_t id;
+ struct clk *core_clk;
+ phy_interface_t phy_mode;
+};
+
+static int get_clk_div_sgmii(struct ipq806x_gmac *gmac, unsigned int speed)
+{
+ struct device *dev = &gmac->pdev->dev;
+ int div;
+
+ switch (speed) {
+ case SPEED_1000:
+ div = NSS_COMMON_CLK_DIV_SGMII_1000;
+ break;
+
+ case SPEED_100:
+ div = NSS_COMMON_CLK_DIV_SGMII_100;
+ break;
+
+ case SPEED_10:
+ div = NSS_COMMON_CLK_DIV_SGMII_10;
+ break;
+
+ default:
+ dev_err(dev, "Speed %dMbps not supported in SGMII\n", speed);
+ return -EINVAL;
+ }
+
+ return div;
+}
+
+static int get_clk_div_rgmii(struct ipq806x_gmac *gmac, unsigned int speed)
+{
+ struct device *dev = &gmac->pdev->dev;
+ int div;
+
+ switch (speed) {
+ case SPEED_1000:
+ div = NSS_COMMON_CLK_DIV_RGMII_1000;
+ break;
+
+ case SPEED_100:
+ div = NSS_COMMON_CLK_DIV_RGMII_100;
+ break;
+
+ case SPEED_10:
+ div = NSS_COMMON_CLK_DIV_RGMII_10;
+ break;
+
+ default:
+ dev_err(dev, "Speed %dMbps not supported in RGMII\n", speed);
+ return -EINVAL;
+ }
+
+ return div;
+}
+
+static int ipq806x_gmac_set_speed(struct ipq806x_gmac *gmac, unsigned int speed)
+{
+ uint32_t clk_bits, val;
+ int div;
+
+ switch (gmac->phy_mode) {
+ case PHY_INTERFACE_MODE_RGMII:
+ div = get_clk_div_rgmii(gmac, speed);
+ clk_bits = NSS_COMMON_CLK_GATE_RGMII_RX_EN(gmac->id) |
+ NSS_COMMON_CLK_GATE_RGMII_TX_EN(gmac->id);
+ break;
+
+ case PHY_INTERFACE_MODE_SGMII:
+ div = get_clk_div_sgmii(gmac, speed);
+ clk_bits = NSS_COMMON_CLK_GATE_GMII_RX_EN(gmac->id) |
+ NSS_COMMON_CLK_GATE_GMII_TX_EN(gmac->id);
+ break;
+
+ default:
+ dev_err(&gmac->pdev->dev, "Unsupported PHY mode: \"%s\"\n",
+ phy_modes(gmac->phy_mode));
+ return -EINVAL;
+ }
+
+ /* Disable the clocks */
+ regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
+ val &= ~clk_bits;
+ regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
+
+ /* Set the divider */
+ regmap_read(gmac->nss_common, NSS_COMMON_CLK_DIV0, &val);
+ val &= ~(NSS_COMMON_CLK_DIV_MASK
+ << NSS_COMMON_CLK_DIV_OFFSET(gmac->id));
+ val |= div << NSS_COMMON_CLK_DIV_OFFSET(gmac->id);
+ regmap_write(gmac->nss_common, NSS_COMMON_CLK_DIV0, val);
+
+ /* Enable the clock back */
+ regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
+ val |= clk_bits;
+ regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
+
+ return 0;
+}
+
+static void *ipq806x_gmac_of_parse(struct ipq806x_gmac *gmac)
+{
+ struct device *dev = &gmac->pdev->dev;
+
+ gmac->phy_mode = of_get_phy_mode(dev->of_node);
+ if (gmac->phy_mode < 0) {
+ dev_err(dev, "missing phy mode property\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (of_property_read_u32(dev->of_node, "qcom,id", &gmac->id) < 0) {
+ dev_err(dev, "missing qcom id property\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* The GMACs are called 1 to 4 in the documentation, but to simplify the
+ * code and keep it consistent with the Linux convention, we'll number
+ * them from 0 to 3 here.
+ */
+ if (gmac->id < 0 || gmac->id > 3) {
+ dev_err(dev, "invalid gmac id\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ gmac->core_clk = devm_clk_get(dev, "stmmaceth");
+ if (IS_ERR(gmac->core_clk)) {
+ dev_err(dev, "missing stmmaceth clk property\n");
+ return gmac->core_clk;
+ }
+ clk_set_rate(gmac->core_clk, 266000000);
+
+ /* Setup the register map for the nss common registers */
+ gmac->nss_common = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "qcom,nss-common");
+ if (IS_ERR(gmac->nss_common)) {
+ dev_err(dev, "missing nss-common node\n");
+ return gmac->nss_common;
+ }
+
+ /* Setup the register map for the qsgmii csr registers */
+ gmac->qsgmii_csr = syscon_regmap_lookup_by_phandle(dev->of_node,
+ "qcom,qsgmii-csr");
+ if (IS_ERR(gmac->qsgmii_csr)) {
+ dev_err(dev, "missing qsgmii-csr node\n");
+ return gmac->qsgmii_csr;
+ }
+
+ return NULL;
+}
+
+static void *ipq806x_gmac_setup(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct ipq806x_gmac *gmac;
+ int val;
+ void *err;
+
+ gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
+ if (!gmac)
+ return ERR_PTR(-ENOMEM);
+
+ gmac->pdev = pdev;
+
+ err = ipq806x_gmac_of_parse(gmac);
+ if (err) {
+ dev_err(dev, "device tree parsing error\n");
+ return err;
+ }
+
+ regmap_write(gmac->qsgmii_csr, QSGMII_PCS_CAL_LCKDT_CTL,
+ QSGMII_PCS_CAL_LCKDT_CTL_RST);
+
+ /* Inter frame gap is set to 12 */
+ val = 12 << NSS_COMMON_GMAC_CTL_IFG_OFFSET |
+ 12 << NSS_COMMON_GMAC_CTL_IFG_LIMIT_OFFSET;
+ /* We also initiate an AXI low power exit request */
+ val |= NSS_COMMON_GMAC_CTL_CSYS_REQ;
+ switch (gmac->phy_mode) {
+ case PHY_INTERFACE_MODE_RGMII:
+ val |= NSS_COMMON_GMAC_CTL_PHY_IFACE_SEL;
+ break;
+ case PHY_INTERFACE_MODE_SGMII:
+ val &= ~NSS_COMMON_GMAC_CTL_PHY_IFACE_SEL;
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported PHY mode: \"%s\"\n",
+ phy_modes(gmac->phy_mode));
+ return NULL;
+ }
+ regmap_write(gmac->nss_common, NSS_COMMON_GMAC_CTL(gmac->id), val);
+
+ /* Configure the clock src according to the mode */
+ regmap_read(gmac->nss_common, NSS_COMMON_CLK_SRC_CTRL, &val);
+ val &= ~NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id);
+ switch (gmac->phy_mode) {
+ case PHY_INTERFACE_MODE_RGMII:
+ val |= NSS_COMMON_CLK_SRC_CTRL_RGMII(gmac->id) <<
+ NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id);
+ break;
+ case PHY_INTERFACE_MODE_SGMII:
+ val |= NSS_COMMON_CLK_SRC_CTRL_SGMII(gmac->id) <<
+ NSS_COMMON_CLK_SRC_CTRL_OFFSET(gmac->id);
+ break;
+ default:
+ dev_err(&pdev->dev, "Unsupported PHY mode: \"%s\"\n",
+ phy_modes(gmac->phy_mode));
+ return NULL;
+ }
+ regmap_write(gmac->nss_common, NSS_COMMON_CLK_SRC_CTRL, val);
+
+ /* Enable PTP clock */
+ regmap_read(gmac->nss_common, NSS_COMMON_CLK_GATE, &val);
+ val |= NSS_COMMON_CLK_GATE_PTP_EN(gmac->id);
+ regmap_write(gmac->nss_common, NSS_COMMON_CLK_GATE, val);
+
+ if (gmac->phy_mode == PHY_INTERFACE_MODE_SGMII) {
+ regmap_write(gmac->qsgmii_csr, QSGMII_PHY_SGMII_CTL(gmac->id),
+ QSGMII_PHY_CDR_EN |
+ QSGMII_PHY_RX_FRONT_EN |
+ QSGMII_PHY_RX_SIGNAL_DETECT_EN |
+ QSGMII_PHY_TX_DRIVER_EN |
+ QSGMII_PHY_QSGMII_EN |
+ 0x4 << QSGMII_PHY_PHASE_LOOP_GAIN_OFFSET |
+ 0x3 << QSGMII_PHY_RX_DC_BIAS_OFFSET |
+ 0x1 << QSGMII_PHY_RX_INPUT_EQU_OFFSET |
+ 0x2 << QSGMII_PHY_CDR_PI_SLEW_OFFSET |
+ 0xC << QSGMII_PHY_TX_DRV_AMP_OFFSET);
+ }
+
+ return gmac;
+}
+
+static void ipq806x_gmac_fix_mac_speed(void *priv, unsigned int speed)
+{
+ struct ipq806x_gmac *gmac = priv;
+
+ ipq806x_gmac_set_speed(gmac, speed);
+}
+
+static const struct stmmac_of_data ipq806x_gmac_data = {
+ .has_gmac = 1,
+ .setup = ipq806x_gmac_setup,
+ .fix_mac_speed = ipq806x_gmac_fix_mac_speed,
+};
+
+static const struct of_device_id ipq806x_gmac_dwmac_match[] = {
+ { .compatible = "qcom,ipq806x-gmac", .data = &ipq806x_gmac_data },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ipq806x_gmac_dwmac_match);
+
+static struct platform_driver ipq806x_gmac_dwmac_driver = {
+ .probe = stmmac_pltfr_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "ipq806x-gmac-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = ipq806x_gmac_dwmac_match,
+ },
+};
+module_platform_driver(ipq806x_gmac_dwmac_driver);
+
+MODULE_AUTHOR("Mathieu Olivari <mathieu@codeaurora.org>");
+MODULE_DESCRIPTION("Qualcomm Atheros IPQ806x DWMAC specific glue layer");
+MODULE_LICENSE("Dual BSD/GPL");
projects / openwrt / staging / blogic.git / commitdiff