2 * Driver for Marvell Xenon SDHC as a platform device
4 * Copyright (C) 2016 Marvell, All Rights Reserved.
6 * Author: Hu Ziji <huziji@marvell.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation version 2.
13 * Inspired by Jisheng Zhang <jszhang@marvell.com>
14 * Special thanks to Video BG4 project team.
17 #include <linux/delay.h>
18 #include <linux/ktime.h>
19 #include <linux/module.h>
22 #include "sdhci-pltfm.h"
23 #include "sdhci-xenon.h"
25 static int xenon_enable_internal_clk(struct sdhci_host *host)
30 reg = sdhci_readl(host, SDHCI_CLOCK_CONTROL);
31 reg |= SDHCI_CLOCK_INT_EN;
32 sdhci_writel(host, reg, SDHCI_CLOCK_CONTROL);
34 timeout = ktime_add_ms(ktime_get(), 20);
35 while (!((reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
36 & SDHCI_CLOCK_INT_STABLE)) {
37 if (ktime_after(ktime_get(), timeout)) {
38 dev_err(mmc_dev(host->mmc), "Internal clock never stabilised.\n");
41 usleep_range(900, 1100);
47 /* Set SDCLK-off-while-idle */
48 static void xenon_set_sdclk_off_idle(struct sdhci_host *host,
49 unsigned char sdhc_id, bool enable)
54 reg = sdhci_readl(host, XENON_SYS_OP_CTRL);
55 /* Get the bit shift basing on the SDHC index */
56 mask = (0x1 << (XENON_SDCLK_IDLEOFF_ENABLE_SHIFT + sdhc_id));
62 sdhci_writel(host, reg, XENON_SYS_OP_CTRL);
65 /* Enable/Disable the Auto Clock Gating function */
66 static void xenon_set_acg(struct sdhci_host *host, bool enable)
70 reg = sdhci_readl(host, XENON_SYS_OP_CTRL);
72 reg &= ~XENON_AUTO_CLKGATE_DISABLE_MASK;
74 reg |= XENON_AUTO_CLKGATE_DISABLE_MASK;
75 sdhci_writel(host, reg, XENON_SYS_OP_CTRL);
78 /* Enable this SDHC */
79 static void xenon_enable_sdhc(struct sdhci_host *host,
80 unsigned char sdhc_id)
84 reg = sdhci_readl(host, XENON_SYS_OP_CTRL);
85 reg |= (BIT(sdhc_id) << XENON_SLOT_ENABLE_SHIFT);
86 sdhci_writel(host, reg, XENON_SYS_OP_CTRL);
88 host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
90 * Force to clear BUS_TEST to
91 * skip bus_test_pre and bus_test_post
93 host->mmc->caps &= ~MMC_CAP_BUS_WIDTH_TEST;
96 /* Disable this SDHC */
97 static void xenon_disable_sdhc(struct sdhci_host *host,
98 unsigned char sdhc_id)
102 reg = sdhci_readl(host, XENON_SYS_OP_CTRL);
103 reg &= ~(BIT(sdhc_id) << XENON_SLOT_ENABLE_SHIFT);
104 sdhci_writel(host, reg, XENON_SYS_OP_CTRL);
107 /* Enable Parallel Transfer Mode */
108 static void xenon_enable_sdhc_parallel_tran(struct sdhci_host *host,
109 unsigned char sdhc_id)
113 reg = sdhci_readl(host, XENON_SYS_EXT_OP_CTRL);
115 sdhci_writel(host, reg, XENON_SYS_EXT_OP_CTRL);
118 /* Mask command conflict error */
119 static void xenon_mask_cmd_conflict_err(struct sdhci_host *host)
123 reg = sdhci_readl(host, XENON_SYS_EXT_OP_CTRL);
124 reg |= XENON_MASK_CMD_CONFLICT_ERR;
125 sdhci_writel(host, reg, XENON_SYS_EXT_OP_CTRL);
128 static void xenon_retune_setup(struct sdhci_host *host)
130 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
131 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
134 /* Disable the Re-Tuning Request functionality */
135 reg = sdhci_readl(host, XENON_SLOT_RETUNING_REQ_CTRL);
136 reg &= ~XENON_RETUNING_COMPATIBLE;
137 sdhci_writel(host, reg, XENON_SLOT_RETUNING_REQ_CTRL);
139 /* Disable the Re-tuning Interrupt */
140 reg = sdhci_readl(host, SDHCI_SIGNAL_ENABLE);
141 reg &= ~SDHCI_INT_RETUNE;
142 sdhci_writel(host, reg, SDHCI_SIGNAL_ENABLE);
143 reg = sdhci_readl(host, SDHCI_INT_ENABLE);
144 reg &= ~SDHCI_INT_RETUNE;
145 sdhci_writel(host, reg, SDHCI_INT_ENABLE);
147 /* Force to use Tuning Mode 1 */
148 host->tuning_mode = SDHCI_TUNING_MODE_1;
149 /* Set re-tuning period */
150 host->tuning_count = 1 << (priv->tuning_count - 1);
154 * Operations inside struct sdhci_ops
156 /* Recover the Register Setting cleared during SOFTWARE_RESET_ALL */
157 static void xenon_reset_exit(struct sdhci_host *host,
158 unsigned char sdhc_id, u8 mask)
160 /* Only SOFTWARE RESET ALL will clear the register setting */
161 if (!(mask & SDHCI_RESET_ALL))
164 /* Disable tuning request and auto-retuning again */
165 xenon_retune_setup(host);
167 xenon_set_acg(host, true);
169 xenon_set_sdclk_off_idle(host, sdhc_id, false);
171 xenon_mask_cmd_conflict_err(host);
174 static void xenon_reset(struct sdhci_host *host, u8 mask)
176 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
177 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
179 sdhci_reset(host, mask);
180 xenon_reset_exit(host, priv->sdhc_id, mask);
184 * Xenon defines different values for HS200 and HS400
187 static void xenon_set_uhs_signaling(struct sdhci_host *host,
192 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
193 /* Select Bus Speed Mode for host */
194 ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
195 if (timing == MMC_TIMING_MMC_HS200)
196 ctrl_2 |= XENON_CTRL_HS200;
197 else if (timing == MMC_TIMING_UHS_SDR104)
198 ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
199 else if (timing == MMC_TIMING_UHS_SDR12)
200 ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
201 else if (timing == MMC_TIMING_UHS_SDR25)
202 ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
203 else if (timing == MMC_TIMING_UHS_SDR50)
204 ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
205 else if ((timing == MMC_TIMING_UHS_DDR50) ||
206 (timing == MMC_TIMING_MMC_DDR52))
207 ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
208 else if (timing == MMC_TIMING_MMC_HS400)
209 ctrl_2 |= XENON_CTRL_HS400;
210 sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
213 static const struct sdhci_ops sdhci_xenon_ops = {
214 .set_clock = sdhci_set_clock,
215 .set_bus_width = sdhci_set_bus_width,
216 .reset = xenon_reset,
217 .set_uhs_signaling = xenon_set_uhs_signaling,
218 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
221 static const struct sdhci_pltfm_data sdhci_xenon_pdata = {
222 .ops = &sdhci_xenon_ops,
223 .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
224 SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER |
225 SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
229 * Xenon Specific Operations in mmc_host_ops
231 static void xenon_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
233 struct sdhci_host *host = mmc_priv(mmc);
234 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
235 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
239 * HS400/HS200/eMMC HS doesn't have Preset Value register.
240 * However, sdhci_set_ios will read HS400/HS200 Preset register.
241 * Disable Preset Value register for HS400/HS200.
242 * eMMC HS with preset_enabled set will trigger a bug in
243 * get_preset_value().
245 if ((ios->timing == MMC_TIMING_MMC_HS400) ||
246 (ios->timing == MMC_TIMING_MMC_HS200) ||
247 (ios->timing == MMC_TIMING_MMC_HS)) {
248 host->preset_enabled = false;
249 host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
250 host->flags &= ~SDHCI_PV_ENABLED;
252 reg = sdhci_readw(host, SDHCI_HOST_CONTROL2);
253 reg &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
254 sdhci_writew(host, reg, SDHCI_HOST_CONTROL2);
256 host->quirks2 &= ~SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
259 sdhci_set_ios(mmc, ios);
260 xenon_phy_adj(host, ios);
262 if (host->clock > XENON_DEFAULT_SDCLK_FREQ)
263 xenon_set_sdclk_off_idle(host, priv->sdhc_id, true);
266 static int xenon_start_signal_voltage_switch(struct mmc_host *mmc,
269 struct sdhci_host *host = mmc_priv(mmc);
272 * Before SD/SDIO set signal voltage, SD bus clock should be
273 * disabled. However, sdhci_set_clock will also disable the Internal
274 * clock in mmc_set_signal_voltage().
275 * If Internal clock is disabled, the 3.3V/1.8V bit can not be updated.
276 * Thus here manually enable internal clock.
278 * After switch completes, it is unnecessary to disable internal clock,
279 * since keeping internal clock active obeys SD spec.
281 xenon_enable_internal_clk(host);
283 xenon_soc_pad_ctrl(host, ios->signal_voltage);
286 * If Vqmmc is fixed on platform, vqmmc regulator should be unavailable.
287 * Thus SDHCI_CTRL_VDD_180 bit might not work then.
288 * Skip the standard voltage switch to avoid any issue.
290 if (PTR_ERR(mmc->supply.vqmmc) == -ENODEV)
293 return sdhci_start_signal_voltage_switch(mmc, ios);
298 * priv->init_card_type will be used in PHY timing adjustment.
300 static void xenon_init_card(struct mmc_host *mmc, struct mmc_card *card)
302 struct sdhci_host *host = mmc_priv(mmc);
303 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
304 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
306 /* Update card type*/
307 priv->init_card_type = card->type;
310 static int xenon_execute_tuning(struct mmc_host *mmc, u32 opcode)
312 struct sdhci_host *host = mmc_priv(mmc);
314 if (host->timing == MMC_TIMING_UHS_DDR50 ||
315 host->timing == MMC_TIMING_MMC_DDR52)
319 * Currently force Xenon driver back to support mode 1 only,
320 * even though Xenon might claim to support mode 2 or mode 3.
321 * It requires more time to test mode 2/mode 3 on more platforms.
323 if (host->tuning_mode != SDHCI_TUNING_MODE_1)
324 xenon_retune_setup(host);
326 return sdhci_execute_tuning(mmc, opcode);
329 static void xenon_enable_sdio_irq(struct mmc_host *mmc, int enable)
331 struct sdhci_host *host = mmc_priv(mmc);
332 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
333 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
335 u8 sdhc_id = priv->sdhc_id;
337 sdhci_enable_sdio_irq(mmc, enable);
341 * Set SDIO Card Inserted indication
342 * to enable detecting SDIO async irq.
344 reg = sdhci_readl(host, XENON_SYS_CFG_INFO);
345 reg |= (1 << (sdhc_id + XENON_SLOT_TYPE_SDIO_SHIFT));
346 sdhci_writel(host, reg, XENON_SYS_CFG_INFO);
348 /* Clear SDIO Card Inserted indication */
349 reg = sdhci_readl(host, XENON_SYS_CFG_INFO);
350 reg &= ~(1 << (sdhc_id + XENON_SLOT_TYPE_SDIO_SHIFT));
351 sdhci_writel(host, reg, XENON_SYS_CFG_INFO);
355 static void xenon_replace_mmc_host_ops(struct sdhci_host *host)
357 host->mmc_host_ops.set_ios = xenon_set_ios;
358 host->mmc_host_ops.start_signal_voltage_switch =
359 xenon_start_signal_voltage_switch;
360 host->mmc_host_ops.init_card = xenon_init_card;
361 host->mmc_host_ops.execute_tuning = xenon_execute_tuning;
362 host->mmc_host_ops.enable_sdio_irq = xenon_enable_sdio_irq;
366 * Parse Xenon specific DT properties:
367 * sdhc-id: the index of current SDHC.
368 * Refer to XENON_SYS_CFG_INFO register
369 * tun-count: the interval between re-tuning
371 static int xenon_probe_dt(struct platform_device *pdev)
373 struct device_node *np = pdev->dev.of_node;
374 struct sdhci_host *host = platform_get_drvdata(pdev);
375 struct mmc_host *mmc = host->mmc;
376 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
377 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
378 u32 sdhc_id, nr_sdhc;
381 /* Disable HS200 on Armada AP806 */
382 if (of_device_is_compatible(np, "marvell,armada-ap806-sdhci"))
383 host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
386 if (!of_property_read_u32(np, "marvell,xenon-sdhc-id", &sdhc_id)) {
387 nr_sdhc = sdhci_readl(host, XENON_SYS_CFG_INFO);
388 nr_sdhc &= XENON_NR_SUPPORTED_SLOT_MASK;
389 if (unlikely(sdhc_id > nr_sdhc)) {
390 dev_err(mmc_dev(mmc), "SDHC Index %d exceeds Number of SDHCs %d\n",
395 priv->sdhc_id = sdhc_id;
397 tuning_count = XENON_DEF_TUNING_COUNT;
398 if (!of_property_read_u32(np, "marvell,xenon-tun-count",
400 if (unlikely(tuning_count >= XENON_TMR_RETUN_NO_PRESENT)) {
401 dev_err(mmc_dev(mmc), "Wrong Re-tuning Count. Set default value %d\n",
402 XENON_DEF_TUNING_COUNT);
403 tuning_count = XENON_DEF_TUNING_COUNT;
406 priv->tuning_count = tuning_count;
408 return xenon_phy_parse_dt(np, host);
411 static int xenon_sdhc_prepare(struct sdhci_host *host)
413 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
414 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
415 u8 sdhc_id = priv->sdhc_id;
418 xenon_enable_sdhc(host, sdhc_id);
421 xenon_set_acg(host, true);
423 /* Enable Parallel Transfer Mode */
424 xenon_enable_sdhc_parallel_tran(host, sdhc_id);
426 /* Disable SDCLK-Off-While-Idle before card init */
427 xenon_set_sdclk_off_idle(host, sdhc_id, false);
429 xenon_mask_cmd_conflict_err(host);
434 static void xenon_sdhc_unprepare(struct sdhci_host *host)
436 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
437 struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
438 u8 sdhc_id = priv->sdhc_id;
441 xenon_disable_sdhc(host, sdhc_id);
444 static int xenon_probe(struct platform_device *pdev)
446 struct sdhci_pltfm_host *pltfm_host;
447 struct sdhci_host *host;
450 host = sdhci_pltfm_init(pdev, &sdhci_xenon_pdata,
451 sizeof(struct xenon_priv));
453 return PTR_ERR(host);
455 pltfm_host = sdhci_priv(host);
458 * Link Xenon specific mmc_host_ops function,
459 * to replace standard ones in sdhci_ops.
461 xenon_replace_mmc_host_ops(host);
463 pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
464 if (IS_ERR(pltfm_host->clk)) {
465 err = PTR_ERR(pltfm_host->clk);
466 dev_err(&pdev->dev, "Failed to setup input clk: %d\n", err);
469 err = clk_prepare_enable(pltfm_host->clk);
473 err = mmc_of_parse(host->mmc);
477 sdhci_get_of_property(pdev);
479 xenon_set_acg(host, false);
481 /* Xenon specific dt parse */
482 err = xenon_probe_dt(pdev);
486 err = xenon_sdhc_prepare(host);
490 err = sdhci_add_host(host);
497 xenon_sdhc_unprepare(host);
499 clk_disable_unprepare(pltfm_host->clk);
501 sdhci_pltfm_free(pdev);
505 static int xenon_remove(struct platform_device *pdev)
507 struct sdhci_host *host = platform_get_drvdata(pdev);
508 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
510 sdhci_remove_host(host, 0);
512 xenon_sdhc_unprepare(host);
514 clk_disable_unprepare(pltfm_host->clk);
516 sdhci_pltfm_free(pdev);
521 static const struct of_device_id sdhci_xenon_dt_ids[] = {
522 { .compatible = "marvell,armada-ap806-sdhci",},
523 { .compatible = "marvell,armada-cp110-sdhci",},
524 { .compatible = "marvell,armada-3700-sdhci",},
527 MODULE_DEVICE_TABLE(of, sdhci_xenon_dt_ids);
529 static struct platform_driver sdhci_xenon_driver = {
531 .name = "xenon-sdhci",
532 .of_match_table = sdhci_xenon_dt_ids,
533 .pm = &sdhci_pltfm_pmops,
535 .probe = xenon_probe,
536 .remove = xenon_remove,
539 module_platform_driver(sdhci_xenon_driver);
541 MODULE_DESCRIPTION("SDHCI platform driver for Marvell Xenon SDHC");
542 MODULE_AUTHOR("Hu Ziji <huziji@marvell.com>");
543 MODULE_LICENSE("GPL v2");