diff options
Diffstat (limited to 'drivers/soc/lantiq/gphy.c')
| -rw-r--r-- | drivers/soc/lantiq/gphy.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/soc/lantiq/gphy.c b/drivers/soc/lantiq/gphy.c new file mode 100644 index 000000000000..8d8659463b3e --- /dev/null +++ b/drivers/soc/lantiq/gphy.c @@ -0,0 +1,260 @@ +/* + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Copyright (C) 2012 John Crispin <blogic@phrozen.org> + * Copyright (C) 2016 Martin Blumenstingl <martin.blumenstingl@googlemail.com> + * Copyright (C) 2017 Hauke Mehrtens <hauke@hauke-m.de> + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/firmware.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/reboot.h> +#include <linux/regmap.h> +#include <linux/reset.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> +#include <linux/property.h> +#include <dt-bindings/mips/lantiq_rcu_gphy.h> + +#include <lantiq_soc.h> + +#define XRX200_GPHY_FW_ALIGN (16 * 1024) + +struct xway_gphy_priv { + struct clk *gphy_clk_gate; + struct reset_control *gphy_reset; + struct reset_control *gphy_reset2; + struct notifier_block gphy_reboot_nb; + void __iomem *membase; + char *fw_name; +}; + +struct xway_gphy_match_data { + char *fe_firmware_name; + char *ge_firmware_name; +}; + +static const struct xway_gphy_match_data xrx200a1x_gphy_data = { + .fe_firmware_name = "lantiq/xrx200_phy22f_a14.bin", + .ge_firmware_name = "lantiq/xrx200_phy11g_a14.bin", +}; + +static const struct xway_gphy_match_data xrx200a2x_gphy_data = { + .fe_firmware_name = "lantiq/xrx200_phy22f_a22.bin", + .ge_firmware_name = "lantiq/xrx200_phy11g_a22.bin", +}; + +static const struct xway_gphy_match_data xrx300_gphy_data = { + .fe_firmware_name = "lantiq/xrx300_phy22f_a21.bin", + .ge_firmware_name = "lantiq/xrx300_phy11g_a21.bin", +}; + +static const struct of_device_id xway_gphy_match[] = { + { .compatible = "lantiq,xrx200a1x-gphy", .data = &xrx200a1x_gphy_data }, + { .compatible = "lantiq,xrx200a2x-gphy", .data = &xrx200a2x_gphy_data }, + { .compatible = "lantiq,xrx300-gphy", .data = &xrx300_gphy_data }, + { .compatible = "lantiq,xrx330-gphy", .data = &xrx300_gphy_data }, + {}, +}; +MODULE_DEVICE_TABLE(of, xway_gphy_match); + +static struct xway_gphy_priv *to_xway_gphy_priv(struct notifier_block *nb) +{ + return container_of(nb, struct xway_gphy_priv, gphy_reboot_nb); +} + +static int xway_gphy_reboot_notify(struct notifier_block *reboot_nb, + unsigned long code, void *unused) +{ + struct xway_gphy_priv *priv = to_xway_gphy_priv(reboot_nb); + + if (priv) { + reset_control_assert(priv->gphy_reset); + reset_control_assert(priv->gphy_reset2); + } + + return NOTIFY_DONE; +} + +static int xway_gphy_load(struct device *dev, struct xway_gphy_priv *priv, + dma_addr_t *dev_addr) +{ + const struct firmware *fw; + void *fw_addr; + dma_addr_t dma_addr; + size_t size; + int ret; + + ret = request_firmware(&fw, priv->fw_name, dev); + if (ret) { + dev_err(dev, "failed to load firmware: %s, error: %i\n", + priv->fw_name, ret); + return ret; + } + + /* + * GPHY cores need the firmware code in a persistent and contiguous + * memory area with a 16 kB boundary aligned start address. + */ + size = fw->size + XRX200_GPHY_FW_ALIGN; + + fw_addr = dmam_alloc_coherent(dev, size, &dma_addr, GFP_KERNEL); + if (fw_addr) { + fw_addr = PTR_ALIGN(fw_addr, XRX200_GPHY_FW_ALIGN); + *dev_addr = ALIGN(dma_addr, XRX200_GPHY_FW_ALIGN); + memcpy(fw_addr, fw->data, fw->size); + } else { + dev_err(dev, "failed to alloc firmware memory\n"); + ret = -ENOMEM; + } + + release_firmware(fw); + + return ret; +} + +static int xway_gphy_of_probe(struct platform_device *pdev, + struct xway_gphy_priv *priv) +{ + struct device *dev = &pdev->dev; + const struct xway_gphy_match_data *gphy_fw_name_cfg; + u32 gphy_mode; + int ret; + struct resource *res_gphy; + + gphy_fw_name_cfg = of_device_get_match_data(dev); + + priv->gphy_clk_gate = devm_clk_get(dev, NULL); + if (IS_ERR(priv->gphy_clk_gate)) { + dev_err(dev, "Failed to lookup gate clock\n"); + return PTR_ERR(priv->gphy_clk_gate); + } + + res_gphy = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->membase = devm_ioremap_resource(dev, res_gphy); + if (IS_ERR(priv->membase)) + return PTR_ERR(priv->membase); + + priv->gphy_reset = devm_reset_control_get(dev, "gphy"); + if (IS_ERR(priv->gphy_reset)) { + if (PTR_ERR(priv->gphy_reset) != -EPROBE_DEFER) + dev_err(dev, "Failed to lookup gphy reset\n"); + return PTR_ERR(priv->gphy_reset); + } + + priv->gphy_reset2 = devm_reset_control_get_optional(dev, "gphy2"); + if (IS_ERR(priv->gphy_reset2)) + return PTR_ERR(priv->gphy_reset2); + + ret = device_property_read_u32(dev, "lantiq,gphy-mode", &gphy_mode); + /* Default to GE mode */ + if (ret) + gphy_mode = GPHY_MODE_GE; + + switch (gphy_mode) { + case GPHY_MODE_FE: + priv->fw_name = gphy_fw_name_cfg->fe_firmware_name; + break; + case GPHY_MODE_GE: + priv->fw_name = gphy_fw_name_cfg->ge_firmware_name; + break; + default: + dev_err(dev, "Unknown GPHY mode %d\n", gphy_mode); + return -EINVAL; + } + + return 0; +} + +static int xway_gphy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct xway_gphy_priv *priv; + dma_addr_t fw_addr = 0; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + ret = xway_gphy_of_probe(pdev, priv); + if (ret) + return ret; + + ret = clk_prepare_enable(priv->gphy_clk_gate); + if (ret) + return ret; + + ret = xway_gphy_load(dev, priv, &fw_addr); + if (ret) { + clk_disable_unprepare(priv->gphy_clk_gate); + return ret; + } + + reset_control_assert(priv->gphy_reset); + reset_control_assert(priv->gphy_reset2); + + iowrite32be(fw_addr, priv->membase); + + reset_control_deassert(priv->gphy_reset); + reset_control_deassert(priv->gphy_reset2); + + /* assert the gphy reset because it can hang after a reboot: */ + priv->gphy_reboot_nb.notifier_call = xway_gphy_reboot_notify; + priv->gphy_reboot_nb.priority = -1; + + ret = register_reboot_notifier(&priv->gphy_reboot_nb); + if (ret) + dev_warn(dev, "Failed to register reboot notifier\n"); + + platform_set_drvdata(pdev, priv); + + return ret; +} + +static int xway_gphy_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct xway_gphy_priv *priv = platform_get_drvdata(pdev); + int ret; + + reset_control_assert(priv->gphy_reset); + reset_control_assert(priv->gphy_reset2); + + iowrite32be(0, priv->membase); + + clk_disable_unprepare(priv->gphy_clk_gate); + + ret = unregister_reboot_notifier(&priv->gphy_reboot_nb); + if (ret) + dev_warn(dev, "Failed to unregister reboot notifier\n"); + + return 0; +} + +static struct platform_driver xway_gphy_driver = { + .probe = xway_gphy_probe, + .remove = xway_gphy_remove, + .driver = { + .name = "xway-rcu-gphy", + .of_match_table = xway_gphy_match, + }, +}; + +module_platform_driver(xway_gphy_driver); + +MODULE_FIRMWARE("lantiq/xrx300_phy11g_a21.bin"); +MODULE_FIRMWARE("lantiq/xrx300_phy22f_a21.bin"); +MODULE_FIRMWARE("lantiq/xrx200_phy11g_a14.bin"); +MODULE_FIRMWARE("lantiq/xrx200_phy11g_a22.bin"); +MODULE_FIRMWARE("lantiq/xrx200_phy22f_a14.bin"); +MODULE_FIRMWARE("lantiq/xrx200_phy22f_a22.bin"); +MODULE_AUTHOR("Martin Blumenstingl <martin.blumenstingl@googlemail.com>"); +MODULE_DESCRIPTION("Lantiq XWAY GPHY Firmware Loader"); +MODULE_LICENSE("GPL"); |