1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation
4 * Provides Bus interface for MIIM regs
6 * Author: Andy Fleming <afleming@freescale.com>
7 * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
9 * Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc.
11 * Based on gianfar_mii.c and ucc_geth_mii.c (Li Yang, Kim Phillips)
14 #include <linux/kernel.h>
15 #include <linux/platform_device.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/slab.h>
19 #include <linux/delay.h>
20 #include <linux/module.h>
21 #include <linux/mii.h>
23 #include <linux/of_address.h>
24 #include <linux/of_mdio.h>
25 #include <linux/property.h>
28 #if IS_ENABLED(CONFIG_UCC_GETH)
29 #include <soc/fsl/qe/ucc.h>
34 #define MIIMIND_BUSY 0x00000001
35 #define MIIMIND_NOTVALID 0x00000004
36 #define MIIMCFG_INIT_VALUE 0x00000007
37 #define MIIMCFG_RESET 0x80000000
39 #define MII_READ_COMMAND 0x00000001
42 u32 miimcfg; /* MII management configuration reg */
43 u32 miimcom; /* MII management command reg */
44 u32 miimadd; /* MII management address reg */
45 u32 miimcon; /* MII management control reg */
46 u32 miimstat; /* MII management status reg */
47 u32 miimind; /* MII management indication reg */
52 u32 ieventm; /* MDIO Interrupt event register (for etsec2)*/
53 u32 imaskm; /* MDIO Interrupt mask register (for etsec2)*/
55 u32 emapm; /* MDIO Event mapping register (for etsec2)*/
57 struct fsl_pq_mii mii;
59 u32 utbipar; /* TBI phy address reg (only on UCC) */
63 /* Number of microseconds to wait for an MII register to respond */
64 #define MII_TIMEOUT 1000
66 struct fsl_pq_mdio_priv {
68 struct fsl_pq_mii __iomem *regs;
72 * Per-device-type data. Each type of device tree node that we support gets
75 * @mii_offset: the offset of the MII registers within the memory map of the
76 * node. Some nodes define only the MII registers, and some define the whole
77 * MAC (which includes the MII registers).
79 * @get_tbipa: determines the address of the TBIPA register
81 * @ucc_configure: a special function for extra QE configuration
83 struct fsl_pq_mdio_data {
84 unsigned int mii_offset; /* offset of the MII registers */
85 uint32_t __iomem * (*get_tbipa)(void __iomem *p);
86 void (*ucc_configure)(phys_addr_t start, phys_addr_t end);
90 * Write value to the PHY at mii_id at register regnum, on the bus attached
91 * to the local interface, which may be different from the generic mdio bus
92 * (tied to a single interface), waiting until the write is done before
93 * returning. This is helpful in programming interfaces like the TBI which
94 * control interfaces like onchip SERDES and are always tied to the local
95 * mdio pins, which may not be the same as system mdio bus, used for
96 * controlling the external PHYs, for example.
98 static int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
101 struct fsl_pq_mdio_priv *priv = bus->priv;
102 struct fsl_pq_mii __iomem *regs = priv->regs;
103 unsigned int timeout;
105 /* Set the PHY address and the register address we want to write */
106 iowrite32be((mii_id << 8) | regnum, ®s->miimadd);
108 /* Write out the value we want */
109 iowrite32be(value, ®s->miimcon);
111 /* Wait for the transaction to finish */
112 timeout = MII_TIMEOUT;
113 while ((ioread32be(®s->miimind) & MIIMIND_BUSY) && timeout) {
118 return timeout ? 0 : -ETIMEDOUT;
122 * Read the bus for PHY at addr mii_id, register regnum, and return the value.
123 * Clears miimcom first.
125 * All PHY operation done on the bus attached to the local interface, which
126 * may be different from the generic mdio bus. This is helpful in programming
127 * interfaces like the TBI which, in turn, control interfaces like on-chip
128 * SERDES and are always tied to the local mdio pins, which may not be the
129 * same as system mdio bus, used for controlling the external PHYs, for eg.
131 static int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
133 struct fsl_pq_mdio_priv *priv = bus->priv;
134 struct fsl_pq_mii __iomem *regs = priv->regs;
135 unsigned int timeout;
138 /* Set the PHY address and the register address we want to read */
139 iowrite32be((mii_id << 8) | regnum, ®s->miimadd);
141 /* Clear miimcom, and then initiate a read */
142 iowrite32be(0, ®s->miimcom);
143 iowrite32be(MII_READ_COMMAND, ®s->miimcom);
145 /* Wait for the transaction to finish, normally less than 100us */
146 timeout = MII_TIMEOUT;
147 while ((ioread32be(®s->miimind) &
148 (MIIMIND_NOTVALID | MIIMIND_BUSY)) && timeout) {
156 /* Grab the value of the register from miimstat */
157 value = ioread32be(®s->miimstat);
159 dev_dbg(&bus->dev, "read %04x from address %x/%x\n", value, mii_id, regnum);
163 /* Reset the MIIM registers, and wait for the bus to free */
164 static int fsl_pq_mdio_reset(struct mii_bus *bus)
166 struct fsl_pq_mdio_priv *priv = bus->priv;
167 struct fsl_pq_mii __iomem *regs = priv->regs;
168 unsigned int timeout;
170 mutex_lock(&bus->mdio_lock);
172 /* Reset the management interface */
173 iowrite32be(MIIMCFG_RESET, ®s->miimcfg);
175 /* Setup the MII Mgmt clock speed */
176 iowrite32be(MIIMCFG_INIT_VALUE, ®s->miimcfg);
178 /* Wait until the bus is free */
179 timeout = MII_TIMEOUT;
180 while ((ioread32be(®s->miimind) & MIIMIND_BUSY) && timeout) {
185 mutex_unlock(&bus->mdio_lock);
188 dev_err(&bus->dev, "timeout waiting for MII bus\n");
195 #if IS_ENABLED(CONFIG_GIANFAR)
197 * Return the TBIPA address, starting from the address
198 * of the mapped GFAR MDIO registers (struct gfar)
199 * This is mildly evil, but so is our hardware for doing this.
200 * Also, we have to cast back to struct gfar because of
201 * definition weirdness done in gianfar.h.
203 static uint32_t __iomem *get_gfar_tbipa_from_mdio(void __iomem *p)
205 struct gfar __iomem *enet_regs = p;
207 return &enet_regs->tbipa;
211 * Return the TBIPA address, starting from the address
212 * of the mapped GFAR MII registers (gfar_mii_regs[] within struct gfar)
214 static uint32_t __iomem *get_gfar_tbipa_from_mii(void __iomem *p)
216 return get_gfar_tbipa_from_mdio(container_of(p, struct gfar, gfar_mii_regs));
220 * Return the TBIPAR address for an eTSEC2 node
222 static uint32_t __iomem *get_etsec_tbipa(void __iomem *p)
228 #if IS_ENABLED(CONFIG_UCC_GETH)
230 * Return the TBIPAR address for a QE MDIO node, starting from the address
231 * of the mapped MII registers (struct fsl_pq_mii)
233 static uint32_t __iomem *get_ucc_tbipa(void __iomem *p)
235 struct fsl_pq_mdio __iomem *mdio = container_of(p, struct fsl_pq_mdio, mii);
237 return &mdio->utbipar;
241 * Find the UCC node that controls the given MDIO node
243 * For some reason, the QE MDIO nodes are not children of the UCC devices
244 * that control them. Therefore, we need to scan all UCC nodes looking for
245 * the one that encompases the given MDIO node. We do this by comparing
246 * physical addresses. The 'start' and 'end' addresses of the MDIO node are
247 * passed, and the correct UCC node will cover the entire address range.
249 * This assumes that there is only one QE MDIO node in the entire device tree.
251 static void ucc_configure(phys_addr_t start, phys_addr_t end)
253 static bool found_mii_master;
254 struct device_node *np = NULL;
256 if (found_mii_master)
259 for_each_compatible_node(np, NULL, "ucc_geth") {
261 const uint32_t *iprop;
265 ret = of_address_to_resource(np, 0, &res);
267 pr_debug("fsl-pq-mdio: no address range in node %pOF\n",
272 /* if our mdio regs fall within this UCC regs range */
273 if ((start < res.start) || (end > res.end))
276 iprop = of_get_property(np, "cell-index", NULL);
278 iprop = of_get_property(np, "device-id", NULL);
280 pr_debug("fsl-pq-mdio: no UCC ID in node %pOF\n",
286 id = be32_to_cpup(iprop);
289 * cell-index and device-id for QE nodes are
290 * numbered from 1, not 0.
292 if (ucc_set_qe_mux_mii_mng(id - 1) < 0) {
293 pr_debug("fsl-pq-mdio: invalid UCC ID in node %pOF\n",
298 pr_debug("fsl-pq-mdio: setting node UCC%u to MII master\n", id);
299 found_mii_master = true;
305 static const struct of_device_id fsl_pq_mdio_match[] = {
306 #if IS_ENABLED(CONFIG_GIANFAR)
308 .compatible = "fsl,gianfar-tbi",
309 .data = &(struct fsl_pq_mdio_data) {
311 .get_tbipa = get_gfar_tbipa_from_mii,
315 .compatible = "fsl,gianfar-mdio",
316 .data = &(struct fsl_pq_mdio_data) {
318 .get_tbipa = get_gfar_tbipa_from_mii,
323 .compatible = "gianfar",
324 .data = &(struct fsl_pq_mdio_data) {
325 .mii_offset = offsetof(struct fsl_pq_mdio, mii),
326 .get_tbipa = get_gfar_tbipa_from_mdio,
330 .compatible = "fsl,etsec2-tbi",
331 .data = &(struct fsl_pq_mdio_data) {
332 .mii_offset = offsetof(struct fsl_pq_mdio, mii),
333 .get_tbipa = get_etsec_tbipa,
337 .compatible = "fsl,etsec2-mdio",
338 .data = &(struct fsl_pq_mdio_data) {
339 .mii_offset = offsetof(struct fsl_pq_mdio, mii),
340 .get_tbipa = get_etsec_tbipa,
344 #if IS_ENABLED(CONFIG_UCC_GETH)
346 .compatible = "fsl,ucc-mdio",
347 .data = &(struct fsl_pq_mdio_data) {
349 .get_tbipa = get_ucc_tbipa,
350 .ucc_configure = ucc_configure,
354 /* Legacy UCC MDIO node */
356 .compatible = "ucc_geth_phy",
357 .data = &(struct fsl_pq_mdio_data) {
359 .get_tbipa = get_ucc_tbipa,
360 .ucc_configure = ucc_configure,
364 /* No Kconfig option for Fman support yet */
366 .compatible = "fsl,fman-mdio",
367 .data = &(struct fsl_pq_mdio_data) {
369 /* Fman TBI operations are handled elsewhere */
375 MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match);
377 static void set_tbipa(const u32 tbipa_val, struct platform_device *pdev,
378 uint32_t __iomem * (*get_tbipa)(void __iomem *),
379 void __iomem *reg_map, struct resource *reg_res)
381 struct device_node *np = pdev->dev.of_node;
382 uint32_t __iomem *tbipa;
385 tbipa = of_iomap(np, 1);
389 tbipa_mapped = false;
390 tbipa = (*get_tbipa)(reg_map);
393 * Add consistency check to make sure TBI is contained within
394 * the mapped range (not because we would get a segfault,
395 * rather to catch bugs in computing TBI address). Print error
396 * message but continue anyway.
398 if ((void *)tbipa > reg_map + resource_size(reg_res) - 4)
399 dev_err(&pdev->dev, "invalid register map (should be at least 0x%04zx to contain TBI address)\n",
400 ((void *)tbipa - reg_map) + 4);
403 iowrite32be(be32_to_cpu(tbipa_val), tbipa);
409 static int fsl_pq_mdio_probe(struct platform_device *pdev)
411 const struct fsl_pq_mdio_data *data;
412 struct device_node *np = pdev->dev.of_node;
414 struct device_node *tbi;
415 struct fsl_pq_mdio_priv *priv;
416 struct mii_bus *new_bus;
419 data = device_get_match_data(&pdev->dev);
421 dev_err(&pdev->dev, "Failed to match device\n");
425 new_bus = mdiobus_alloc_size(sizeof(*priv));
429 priv = new_bus->priv;
430 new_bus->name = "Freescale PowerQUICC MII Bus";
431 new_bus->read = &fsl_pq_mdio_read;
432 new_bus->write = &fsl_pq_mdio_write;
433 new_bus->reset = &fsl_pq_mdio_reset;
435 err = of_address_to_resource(np, 0, &res);
437 dev_err(&pdev->dev, "could not obtain address information\n");
441 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%pOFn@%llx", np,
442 (unsigned long long)res.start);
444 priv->map = of_iomap(np, 0);
451 * Some device tree nodes represent only the MII registers, and
452 * others represent the MAC and MII registers. The 'mii_offset' field
453 * contains the offset of the MII registers inside the mapped register
456 if (data->mii_offset > resource_size(&res)) {
457 dev_err(&pdev->dev, "invalid register map\n");
461 priv->regs = priv->map + data->mii_offset;
463 new_bus->parent = &pdev->dev;
464 platform_set_drvdata(pdev, new_bus);
466 if (data->get_tbipa) {
467 for_each_child_of_node(np, tbi) {
468 if (of_node_is_type(tbi, "tbi-phy")) {
469 dev_dbg(&pdev->dev, "found TBI PHY node %pOFP\n",
476 const u32 *prop = of_get_property(tbi, "reg", NULL);
479 "missing 'reg' property in node %pOF\n",
484 set_tbipa(*prop, pdev,
485 data->get_tbipa, priv->map, &res);
489 if (data->ucc_configure)
490 data->ucc_configure(res.start, res.end);
492 err = of_mdiobus_register(new_bus, np);
494 dev_err(&pdev->dev, "cannot register %s as MDIO bus\n",
511 static void fsl_pq_mdio_remove(struct platform_device *pdev)
513 struct device *device = &pdev->dev;
514 struct mii_bus *bus = dev_get_drvdata(device);
515 struct fsl_pq_mdio_priv *priv = bus->priv;
517 mdiobus_unregister(bus);
523 static struct platform_driver fsl_pq_mdio_driver = {
525 .name = "fsl-pq_mdio",
526 .of_match_table = fsl_pq_mdio_match,
528 .probe = fsl_pq_mdio_probe,
529 .remove_new = fsl_pq_mdio_remove,
532 module_platform_driver(fsl_pq_mdio_driver);
534 MODULE_DESCRIPTION("Freescale PQ MDIO helpers");
535 MODULE_LICENSE("GPL");