| /* |
| * Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation |
| * Provides Bus interface for MIIM regs |
| * |
| * Author: Andy Fleming <afleming@freescale.com> |
| * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com> |
| * |
| * Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc. |
| * |
| * Based on gianfar_mii.c and ucc_geth_mii.c (Li Yang, Kim Phillips) |
| * |
| * 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 of the License, or (at your |
| * option) any later version. |
| * |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/string.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/delay.h> |
| #include <linux/module.h> |
| #include <linux/mii.h> |
| #include <linux/of_address.h> |
| #include <linux/of_mdio.h> |
| #include <linux/of_device.h> |
| |
| #include <asm/io.h> |
| #if IS_ENABLED(CONFIG_UCC_GETH) |
| #include <soc/fsl/qe/ucc.h> |
| #endif |
| |
| #include "gianfar.h" |
| |
| #define MIIMIND_BUSY 0x00000001 |
| #define MIIMIND_NOTVALID 0x00000004 |
| #define MIIMCFG_INIT_VALUE 0x00000007 |
| #define MIIMCFG_RESET 0x80000000 |
| |
| #define MII_READ_COMMAND 0x00000001 |
| |
| struct fsl_pq_mii { |
| u32 miimcfg; /* MII management configuration reg */ |
| u32 miimcom; /* MII management command reg */ |
| u32 miimadd; /* MII management address reg */ |
| u32 miimcon; /* MII management control reg */ |
| u32 miimstat; /* MII management status reg */ |
| u32 miimind; /* MII management indication reg */ |
| }; |
| |
| struct fsl_pq_mdio { |
| u8 res1[16]; |
| u32 ieventm; /* MDIO Interrupt event register (for etsec2)*/ |
| u32 imaskm; /* MDIO Interrupt mask register (for etsec2)*/ |
| u8 res2[4]; |
| u32 emapm; /* MDIO Event mapping register (for etsec2)*/ |
| u8 res3[1280]; |
| struct fsl_pq_mii mii; |
| u8 res4[28]; |
| u32 utbipar; /* TBI phy address reg (only on UCC) */ |
| u8 res5[2728]; |
| } __packed; |
| |
| /* Number of microseconds to wait for an MII register to respond */ |
| #define MII_TIMEOUT 1000 |
| |
| struct fsl_pq_mdio_priv { |
| void __iomem *map; |
| struct fsl_pq_mii __iomem *regs; |
| }; |
| |
| /* |
| * Per-device-type data. Each type of device tree node that we support gets |
| * one of these. |
| * |
| * @mii_offset: the offset of the MII registers within the memory map of the |
| * node. Some nodes define only the MII registers, and some define the whole |
| * MAC (which includes the MII registers). |
| * |
| * @get_tbipa: determines the address of the TBIPA register |
| * |
| * @ucc_configure: a special function for extra QE configuration |
| */ |
| struct fsl_pq_mdio_data { |
| unsigned int mii_offset; /* offset of the MII registers */ |
| uint32_t __iomem * (*get_tbipa)(void __iomem *p); |
| void (*ucc_configure)(phys_addr_t start, phys_addr_t end); |
| }; |
| |
| /* |
| * Write value to the PHY at mii_id at register regnum, on the bus attached |
| * to the local interface, which may be different from the generic mdio bus |
| * (tied to a single interface), waiting until the write is done before |
| * returning. This is helpful in programming interfaces like the TBI which |
| * control interfaces like onchip SERDES and are always tied to the local |
| * mdio pins, which may not be the same as system mdio bus, used for |
| * controlling the external PHYs, for example. |
| */ |
| static int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum, |
| u16 value) |
| { |
| struct fsl_pq_mdio_priv *priv = bus->priv; |
| struct fsl_pq_mii __iomem *regs = priv->regs; |
| unsigned int timeout; |
| |
| /* Set the PHY address and the register address we want to write */ |
| iowrite32be((mii_id << 8) | regnum, ®s->miimadd); |
| |
| /* Write out the value we want */ |
| iowrite32be(value, ®s->miimcon); |
| |
| /* Wait for the transaction to finish */ |
| timeout = MII_TIMEOUT; |
| while ((ioread32be(®s->miimind) & MIIMIND_BUSY) && timeout) { |
| cpu_relax(); |
| timeout--; |
| } |
| |
| return timeout ? 0 : -ETIMEDOUT; |
| } |
| |
| /* |
| * Read the bus for PHY at addr mii_id, register regnum, and return the value. |
| * Clears miimcom first. |
| * |
| * All PHY operation done on the bus attached to the local interface, which |
| * may be different from the generic mdio bus. This is helpful in programming |
| * interfaces like the TBI which, in turn, control interfaces like on-chip |
| * SERDES and are always tied to the local mdio pins, which may not be the |
| * same as system mdio bus, used for controlling the external PHYs, for eg. |
| */ |
| static int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum) |
| { |
| struct fsl_pq_mdio_priv *priv = bus->priv; |
| struct fsl_pq_mii __iomem *regs = priv->regs; |
| unsigned int timeout; |
| u16 value; |
| |
| /* Set the PHY address and the register address we want to read */ |
| iowrite32be((mii_id << 8) | regnum, ®s->miimadd); |
| |
| /* Clear miimcom, and then initiate a read */ |
| iowrite32be(0, ®s->miimcom); |
| iowrite32be(MII_READ_COMMAND, ®s->miimcom); |
| |
| /* Wait for the transaction to finish, normally less than 100us */ |
| timeout = MII_TIMEOUT; |
| while ((ioread32be(®s->miimind) & |
| (MIIMIND_NOTVALID | MIIMIND_BUSY)) && timeout) { |
| cpu_relax(); |
| timeout--; |
| } |
| |
| if (!timeout) |
| return -ETIMEDOUT; |
| |
| /* Grab the value of the register from miimstat */ |
| value = ioread32be(®s->miimstat); |
| |
| dev_dbg(&bus->dev, "read %04x from address %x/%x\n", value, mii_id, regnum); |
| return value; |
| } |
| |
| /* Reset the MIIM registers, and wait for the bus to free */ |
| static int fsl_pq_mdio_reset(struct mii_bus *bus) |
| { |
| struct fsl_pq_mdio_priv *priv = bus->priv; |
| struct fsl_pq_mii __iomem *regs = priv->regs; |
| unsigned int timeout; |
| |
| mutex_lock(&bus->mdio_lock); |
| |
| /* Reset the management interface */ |
| iowrite32be(MIIMCFG_RESET, ®s->miimcfg); |
| |
| /* Setup the MII Mgmt clock speed */ |
| iowrite32be(MIIMCFG_INIT_VALUE, ®s->miimcfg); |
| |
| /* Wait until the bus is free */ |
| timeout = MII_TIMEOUT; |
| while ((ioread32be(®s->miimind) & MIIMIND_BUSY) && timeout) { |
| cpu_relax(); |
| timeout--; |
| } |
| |
| mutex_unlock(&bus->mdio_lock); |
| |
| if (!timeout) { |
| dev_err(&bus->dev, "timeout waiting for MII bus\n"); |
| return -EBUSY; |
| } |
| |
| return 0; |
| } |
| |
| #if IS_ENABLED(CONFIG_GIANFAR) |
| /* |
| * Return the TBIPA address, starting from the address |
| * of the mapped GFAR MDIO registers (struct gfar) |
| * This is mildly evil, but so is our hardware for doing this. |
| * Also, we have to cast back to struct gfar because of |
| * definition weirdness done in gianfar.h. |
| */ |
| static uint32_t __iomem *get_gfar_tbipa_from_mdio(void __iomem *p) |
| { |
| struct gfar __iomem *enet_regs = p; |
| |
| return &enet_regs->tbipa; |
| } |
| |
| /* |
| * Return the TBIPA address, starting from the address |
| * of the mapped GFAR MII registers (gfar_mii_regs[] within struct gfar) |
| */ |
| static uint32_t __iomem *get_gfar_tbipa_from_mii(void __iomem *p) |
| { |
| return get_gfar_tbipa_from_mdio(container_of(p, struct gfar, gfar_mii_regs)); |
| } |
| |
| /* |
| * Return the TBIPAR address for an eTSEC2 node |
| */ |
| static uint32_t __iomem *get_etsec_tbipa(void __iomem *p) |
| { |
| return p; |
| } |
| #endif |
| |
| #if IS_ENABLED(CONFIG_UCC_GETH) |
| /* |
| * Return the TBIPAR address for a QE MDIO node, starting from the address |
| * of the mapped MII registers (struct fsl_pq_mii) |
| */ |
| static uint32_t __iomem *get_ucc_tbipa(void __iomem *p) |
| { |
| struct fsl_pq_mdio __iomem *mdio = container_of(p, struct fsl_pq_mdio, mii); |
| |
| return &mdio->utbipar; |
| } |
| |
| /* |
| * Find the UCC node that controls the given MDIO node |
| * |
| * For some reason, the QE MDIO nodes are not children of the UCC devices |
| * that control them. Therefore, we need to scan all UCC nodes looking for |
| * the one that encompases the given MDIO node. We do this by comparing |
| * physical addresses. The 'start' and 'end' addresses of the MDIO node are |
| * passed, and the correct UCC node will cover the entire address range. |
| * |
| * This assumes that there is only one QE MDIO node in the entire device tree. |
| */ |
| static void ucc_configure(phys_addr_t start, phys_addr_t end) |
| { |
| static bool found_mii_master; |
| struct device_node *np = NULL; |
| |
| if (found_mii_master) |
| return; |
| |
| for_each_compatible_node(np, NULL, "ucc_geth") { |
| struct resource res; |
| const uint32_t *iprop; |
| uint32_t id; |
| int ret; |
| |
| ret = of_address_to_resource(np, 0, &res); |
| if (ret < 0) { |
| pr_debug("fsl-pq-mdio: no address range in node %pOF\n", |
| np); |
| continue; |
| } |
| |
| /* if our mdio regs fall within this UCC regs range */ |
| if ((start < res.start) || (end > res.end)) |
| continue; |
| |
| iprop = of_get_property(np, "cell-index", NULL); |
| if (!iprop) { |
| iprop = of_get_property(np, "device-id", NULL); |
| if (!iprop) { |
| pr_debug("fsl-pq-mdio: no UCC ID in node %pOF\n", |
| np); |
| continue; |
| } |
| } |
| |
| id = be32_to_cpup(iprop); |
| |
| /* |
| * cell-index and device-id for QE nodes are |
| * numbered from 1, not 0. |
| */ |
| if (ucc_set_qe_mux_mii_mng(id - 1) < 0) { |
| pr_debug("fsl-pq-mdio: invalid UCC ID in node %pOF\n", |
| np); |
| continue; |
| } |
| |
| pr_debug("fsl-pq-mdio: setting node UCC%u to MII master\n", id); |
| found_mii_master = true; |
| } |
| } |
| |
| #endif |
| |
| static const struct of_device_id fsl_pq_mdio_match[] = { |
| #if IS_ENABLED(CONFIG_GIANFAR) |
| { |
| .compatible = "fsl,gianfar-tbi", |
| .data = &(struct fsl_pq_mdio_data) { |
| .mii_offset = 0, |
| .get_tbipa = get_gfar_tbipa_from_mii, |
| }, |
| }, |
| { |
| .compatible = "fsl,gianfar-mdio", |
| .data = &(struct fsl_pq_mdio_data) { |
| .mii_offset = 0, |
| .get_tbipa = get_gfar_tbipa_from_mii, |
| }, |
| }, |
| { |
| .type = "mdio", |
| .compatible = "gianfar", |
| .data = &(struct fsl_pq_mdio_data) { |
| .mii_offset = offsetof(struct fsl_pq_mdio, mii), |
| .get_tbipa = get_gfar_tbipa_from_mdio, |
| }, |
| }, |
| { |
| .compatible = "fsl,etsec2-tbi", |
| .data = &(struct fsl_pq_mdio_data) { |
| .mii_offset = offsetof(struct fsl_pq_mdio, mii), |
| .get_tbipa = get_etsec_tbipa, |
| }, |
| }, |
| { |
| .compatible = "fsl,etsec2-mdio", |
| .data = &(struct fsl_pq_mdio_data) { |
| .mii_offset = offsetof(struct fsl_pq_mdio, mii), |
| .get_tbipa = get_etsec_tbipa, |
| }, |
| }, |
| #endif |
| #if IS_ENABLED(CONFIG_UCC_GETH) |
| { |
| .compatible = "fsl,ucc-mdio", |
| .data = &(struct fsl_pq_mdio_data) { |
| .mii_offset = 0, |
| .get_tbipa = get_ucc_tbipa, |
| .ucc_configure = ucc_configure, |
| }, |
| }, |
| { |
| /* Legacy UCC MDIO node */ |
| .type = "mdio", |
| .compatible = "ucc_geth_phy", |
| .data = &(struct fsl_pq_mdio_data) { |
| .mii_offset = 0, |
| .get_tbipa = get_ucc_tbipa, |
| .ucc_configure = ucc_configure, |
| }, |
| }, |
| #endif |
| /* No Kconfig option for Fman support yet */ |
| { |
| .compatible = "fsl,fman-mdio", |
| .data = &(struct fsl_pq_mdio_data) { |
| .mii_offset = 0, |
| /* Fman TBI operations are handled elsewhere */ |
| }, |
| }, |
| |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match); |
| |
| static void set_tbipa(const u32 tbipa_val, struct platform_device *pdev, |
| uint32_t __iomem * (*get_tbipa)(void __iomem *), |
| void __iomem *reg_map, struct resource *reg_res) |
| { |
| struct device_node *np = pdev->dev.of_node; |
| uint32_t __iomem *tbipa; |
| bool tbipa_mapped; |
| |
| tbipa = of_iomap(np, 1); |
| if (tbipa) { |
| tbipa_mapped = true; |
| } else { |
| tbipa_mapped = false; |
| tbipa = (*get_tbipa)(reg_map); |
| |
| /* |
| * Add consistency check to make sure TBI is contained within |
| * the mapped range (not because we would get a segfault, |
| * rather to catch bugs in computing TBI address). Print error |
| * message but continue anyway. |
| */ |
| if ((void *)tbipa > reg_map + resource_size(reg_res) - 4) |
| dev_err(&pdev->dev, "invalid register map (should be at least 0x%04zx to contain TBI address)\n", |
| ((void *)tbipa - reg_map) + 4); |
| } |
| |
| iowrite32be(be32_to_cpu(tbipa_val), tbipa); |
| |
| if (tbipa_mapped) |
| iounmap(tbipa); |
| } |
| |
| static int fsl_pq_mdio_probe(struct platform_device *pdev) |
| { |
| const struct of_device_id *id = |
| of_match_device(fsl_pq_mdio_match, &pdev->dev); |
| const struct fsl_pq_mdio_data *data; |
| struct device_node *np = pdev->dev.of_node; |
| struct resource res; |
| struct device_node *tbi; |
| struct fsl_pq_mdio_priv *priv; |
| struct mii_bus *new_bus; |
| int err; |
| |
| if (!id) { |
| dev_err(&pdev->dev, "Failed to match device\n"); |
| return -ENODEV; |
| } |
| |
| data = id->data; |
| |
| dev_dbg(&pdev->dev, "found %s compatible node\n", id->compatible); |
| |
| new_bus = mdiobus_alloc_size(sizeof(*priv)); |
| if (!new_bus) |
| return -ENOMEM; |
| |
| priv = new_bus->priv; |
| new_bus->name = "Freescale PowerQUICC MII Bus", |
| new_bus->read = &fsl_pq_mdio_read; |
| new_bus->write = &fsl_pq_mdio_write; |
| new_bus->reset = &fsl_pq_mdio_reset; |
| |
| err = of_address_to_resource(np, 0, &res); |
| if (err < 0) { |
| dev_err(&pdev->dev, "could not obtain address information\n"); |
| goto error; |
| } |
| |
| snprintf(new_bus->id, MII_BUS_ID_SIZE, "%pOFn@%llx", np, |
| (unsigned long long)res.start); |
| |
| priv->map = of_iomap(np, 0); |
| if (!priv->map) { |
| err = -ENOMEM; |
| goto error; |
| } |
| |
| /* |
| * Some device tree nodes represent only the MII registers, and |
| * others represent the MAC and MII registers. The 'mii_offset' field |
| * contains the offset of the MII registers inside the mapped register |
| * space. |
| */ |
| if (data->mii_offset > resource_size(&res)) { |
| dev_err(&pdev->dev, "invalid register map\n"); |
| err = -EINVAL; |
| goto error; |
| } |
| priv->regs = priv->map + data->mii_offset; |
| |
| new_bus->parent = &pdev->dev; |
| platform_set_drvdata(pdev, new_bus); |
| |
| if (data->get_tbipa) { |
| for_each_child_of_node(np, tbi) { |
| if (of_node_is_type(tbi, "tbi-phy")) { |
| dev_dbg(&pdev->dev, "found TBI PHY node %pOFP\n", |
| tbi); |
| break; |
| } |
| } |
| |
| if (tbi) { |
| const u32 *prop = of_get_property(tbi, "reg", NULL); |
| if (!prop) { |
| dev_err(&pdev->dev, |
| "missing 'reg' property in node %pOF\n", |
| tbi); |
| err = -EBUSY; |
| goto error; |
| } |
| set_tbipa(*prop, pdev, |
| data->get_tbipa, priv->map, &res); |
| } |
| } |
| |
| if (data->ucc_configure) |
| data->ucc_configure(res.start, res.end); |
| |
| err = of_mdiobus_register(new_bus, np); |
| if (err) { |
| dev_err(&pdev->dev, "cannot register %s as MDIO bus\n", |
| new_bus->name); |
| goto error; |
| } |
| |
| return 0; |
| |
| error: |
| if (priv->map) |
| iounmap(priv->map); |
| |
| kfree(new_bus); |
| |
| return err; |
| } |
| |
| |
| static int fsl_pq_mdio_remove(struct platform_device *pdev) |
| { |
| struct device *device = &pdev->dev; |
| struct mii_bus *bus = dev_get_drvdata(device); |
| struct fsl_pq_mdio_priv *priv = bus->priv; |
| |
| mdiobus_unregister(bus); |
| |
| iounmap(priv->map); |
| mdiobus_free(bus); |
| |
| return 0; |
| } |
| |
| static struct platform_driver fsl_pq_mdio_driver = { |
| .driver = { |
| .name = "fsl-pq_mdio", |
| .of_match_table = fsl_pq_mdio_match, |
| }, |
| .probe = fsl_pq_mdio_probe, |
| .remove = fsl_pq_mdio_remove, |
| }; |
| |
| module_platform_driver(fsl_pq_mdio_driver); |
| |
| MODULE_LICENSE("GPL"); |