1 // SPDX-License-Identifier: GPL-2.0-only
2 // Copyright (C) 2014 Broadcom Corporation
5 * iProc SDHCI platform driver
8 #include <linux/acpi.h>
9 #include <linux/delay.h>
10 #include <linux/module.h>
11 #include <linux/mmc/host.h>
13 #include <linux/of_device.h>
14 #include "sdhci-pltfm.h"
16 struct sdhci_iproc_data {
17 const struct sdhci_pltfm_data *pdata;
23 struct sdhci_iproc_host {
24 const struct sdhci_iproc_data *data;
31 #define REG_OFFSET_IN_BITS(reg) ((reg) << 3 & 0x18)
33 static inline u32 sdhci_iproc_readl(struct sdhci_host *host, int reg)
35 u32 val = readl(host->ioaddr + reg);
37 pr_debug("%s: readl [0x%02x] 0x%08x\n",
38 mmc_hostname(host->mmc), reg, val);
42 static u16 sdhci_iproc_readw(struct sdhci_host *host, int reg)
44 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
45 struct sdhci_iproc_host *iproc_host = sdhci_pltfm_priv(pltfm_host);
49 if ((reg == SDHCI_TRANSFER_MODE) && iproc_host->is_cmd_shadowed) {
50 /* Get the saved transfer mode */
51 val = iproc_host->shadow_cmd;
52 } else if ((reg == SDHCI_BLOCK_SIZE || reg == SDHCI_BLOCK_COUNT) &&
53 iproc_host->is_blk_shadowed) {
54 /* Get the saved block info */
55 val = iproc_host->shadow_blk;
57 val = sdhci_iproc_readl(host, (reg & ~3));
59 word = val >> REG_OFFSET_IN_BITS(reg) & 0xffff;
63 static u8 sdhci_iproc_readb(struct sdhci_host *host, int reg)
65 u32 val = sdhci_iproc_readl(host, (reg & ~3));
66 u8 byte = val >> REG_OFFSET_IN_BITS(reg) & 0xff;
70 static inline void sdhci_iproc_writel(struct sdhci_host *host, u32 val, int reg)
72 pr_debug("%s: writel [0x%02x] 0x%08x\n",
73 mmc_hostname(host->mmc), reg, val);
75 writel(val, host->ioaddr + reg);
77 if (host->clock <= 400000) {
78 /* Round up to micro-second four SD clock delay */
80 udelay((4 * 1000000 + host->clock - 1) / host->clock);
87 * The Arasan has a bugette whereby it may lose the content of successive
88 * writes to the same register that are within two SD-card clock cycles of
89 * each other (a clock domain crossing problem). The data
90 * register does not have this problem, which is just as well - otherwise we'd
91 * have to nobble the DMA engine too.
93 * This wouldn't be a problem with the code except that we can only write the
94 * controller with 32-bit writes. So two different 16-bit registers are
95 * written back to back creates the problem.
97 * In reality, this only happens when SDHCI_BLOCK_SIZE and SDHCI_BLOCK_COUNT
98 * are written followed by SDHCI_TRANSFER_MODE and SDHCI_COMMAND.
99 * The BLOCK_SIZE and BLOCK_COUNT are meaningless until a command issued so
100 * the work around can be further optimized. We can keep shadow values of
101 * BLOCK_SIZE, BLOCK_COUNT, and TRANSFER_MODE until a COMMAND is issued.
102 * Then, write the BLOCK_SIZE+BLOCK_COUNT in a single 32-bit write followed
103 * by the TRANSFER+COMMAND in another 32-bit write.
105 static void sdhci_iproc_writew(struct sdhci_host *host, u16 val, int reg)
107 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
108 struct sdhci_iproc_host *iproc_host = sdhci_pltfm_priv(pltfm_host);
109 u32 word_shift = REG_OFFSET_IN_BITS(reg);
110 u32 mask = 0xffff << word_shift;
113 if (reg == SDHCI_COMMAND) {
114 /* Write the block now as we are issuing a command */
115 if (iproc_host->is_blk_shadowed) {
116 sdhci_iproc_writel(host, iproc_host->shadow_blk,
118 iproc_host->is_blk_shadowed = false;
120 oldval = iproc_host->shadow_cmd;
121 iproc_host->is_cmd_shadowed = false;
122 } else if ((reg == SDHCI_BLOCK_SIZE || reg == SDHCI_BLOCK_COUNT) &&
123 iproc_host->is_blk_shadowed) {
124 /* Block size and count are stored in shadow reg */
125 oldval = iproc_host->shadow_blk;
127 /* Read reg, all other registers are not shadowed */
128 oldval = sdhci_iproc_readl(host, (reg & ~3));
130 newval = (oldval & ~mask) | (val << word_shift);
132 if (reg == SDHCI_TRANSFER_MODE) {
133 /* Save the transfer mode until the command is issued */
134 iproc_host->shadow_cmd = newval;
135 iproc_host->is_cmd_shadowed = true;
136 } else if (reg == SDHCI_BLOCK_SIZE || reg == SDHCI_BLOCK_COUNT) {
137 /* Save the block info until the command is issued */
138 iproc_host->shadow_blk = newval;
139 iproc_host->is_blk_shadowed = true;
141 /* Command or other regular 32-bit write */
142 sdhci_iproc_writel(host, newval, reg & ~3);
146 static void sdhci_iproc_writeb(struct sdhci_host *host, u8 val, int reg)
148 u32 oldval = sdhci_iproc_readl(host, (reg & ~3));
149 u32 byte_shift = REG_OFFSET_IN_BITS(reg);
150 u32 mask = 0xff << byte_shift;
151 u32 newval = (oldval & ~mask) | (val << byte_shift);
153 sdhci_iproc_writel(host, newval, reg & ~3);
156 static unsigned int sdhci_iproc_get_max_clock(struct sdhci_host *host)
158 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
161 return sdhci_pltfm_clk_get_max_clock(host);
163 return pltfm_host->clock;
167 * There is a known bug on BCM2711's SDHCI core integration where the
168 * controller will hang when the difference between the core clock and the bus
169 * clock is too great. Specifically this can be reproduced under the following
172 * - No SD card plugged in, polling thread is running, probing cards at
174 * - BCM2711's core clock configured at 500MHz or more
176 * So we set 200kHz as the minimum clock frequency available for that SoC.
178 static unsigned int sdhci_iproc_bcm2711_get_min_clock(struct sdhci_host *host)
183 static const struct sdhci_ops sdhci_iproc_ops = {
184 .set_clock = sdhci_set_clock,
185 .get_max_clock = sdhci_iproc_get_max_clock,
186 .set_bus_width = sdhci_set_bus_width,
187 .reset = sdhci_reset,
188 .set_uhs_signaling = sdhci_set_uhs_signaling,
191 static const struct sdhci_ops sdhci_iproc_32only_ops = {
192 .read_l = sdhci_iproc_readl,
193 .read_w = sdhci_iproc_readw,
194 .read_b = sdhci_iproc_readb,
195 .write_l = sdhci_iproc_writel,
196 .write_w = sdhci_iproc_writew,
197 .write_b = sdhci_iproc_writeb,
198 .set_clock = sdhci_set_clock,
199 .get_max_clock = sdhci_iproc_get_max_clock,
200 .set_bus_width = sdhci_set_bus_width,
201 .reset = sdhci_reset,
202 .set_uhs_signaling = sdhci_set_uhs_signaling,
205 static const struct sdhci_pltfm_data sdhci_iproc_cygnus_pltfm_data = {
206 .quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
207 SDHCI_QUIRK_NO_HISPD_BIT,
208 .quirks2 = SDHCI_QUIRK2_ACMD23_BROKEN | SDHCI_QUIRK2_HOST_OFF_CARD_ON,
209 .ops = &sdhci_iproc_32only_ops,
212 static const struct sdhci_iproc_data iproc_cygnus_data = {
213 .pdata = &sdhci_iproc_cygnus_pltfm_data,
214 .caps = ((0x1 << SDHCI_MAX_BLOCK_SHIFT)
215 & SDHCI_MAX_BLOCK_MASK) |
218 SDHCI_CAN_DO_SUSPEND |
222 .caps1 = SDHCI_DRIVER_TYPE_C |
223 SDHCI_DRIVER_TYPE_D |
225 .mmc_caps = MMC_CAP_1_8V_DDR,
228 static const struct sdhci_pltfm_data sdhci_iproc_pltfm_data = {
229 .quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
230 SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 |
231 SDHCI_QUIRK_NO_HISPD_BIT,
232 .quirks2 = SDHCI_QUIRK2_ACMD23_BROKEN,
233 .ops = &sdhci_iproc_ops,
236 static const struct sdhci_iproc_data iproc_data = {
237 .pdata = &sdhci_iproc_pltfm_data,
238 .caps = ((0x1 << SDHCI_MAX_BLOCK_SHIFT)
239 & SDHCI_MAX_BLOCK_MASK) |
242 SDHCI_CAN_DO_SUSPEND |
246 .caps1 = SDHCI_DRIVER_TYPE_C |
247 SDHCI_DRIVER_TYPE_D |
251 static const struct sdhci_pltfm_data sdhci_bcm2835_pltfm_data = {
252 .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
253 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
254 SDHCI_QUIRK_MISSING_CAPS |
255 SDHCI_QUIRK_NO_HISPD_BIT,
256 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
257 .ops = &sdhci_iproc_32only_ops,
260 static const struct sdhci_iproc_data bcm2835_data = {
261 .pdata = &sdhci_bcm2835_pltfm_data,
262 .caps = ((0x1 << SDHCI_MAX_BLOCK_SHIFT)
263 & SDHCI_MAX_BLOCK_MASK) |
266 .caps1 = SDHCI_DRIVER_TYPE_A |
268 .mmc_caps = 0x00000000,
271 static const struct sdhci_ops sdhci_iproc_bcm2711_ops = {
272 .read_l = sdhci_iproc_readl,
273 .read_w = sdhci_iproc_readw,
274 .read_b = sdhci_iproc_readb,
275 .write_l = sdhci_iproc_writel,
276 .write_w = sdhci_iproc_writew,
277 .write_b = sdhci_iproc_writeb,
278 .set_clock = sdhci_set_clock,
279 .set_power = sdhci_set_power_and_bus_voltage,
280 .get_max_clock = sdhci_iproc_get_max_clock,
281 .get_min_clock = sdhci_iproc_bcm2711_get_min_clock,
282 .set_bus_width = sdhci_set_bus_width,
283 .reset = sdhci_reset,
284 .set_uhs_signaling = sdhci_set_uhs_signaling,
287 static const struct sdhci_pltfm_data sdhci_bcm2711_pltfm_data = {
288 .quirks = SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12,
289 .ops = &sdhci_iproc_bcm2711_ops,
292 static const struct sdhci_iproc_data bcm2711_data = {
293 .pdata = &sdhci_bcm2711_pltfm_data,
294 .mmc_caps = MMC_CAP_3_3V_DDR,
297 static const struct sdhci_pltfm_data sdhci_bcm7211a0_pltfm_data = {
298 .quirks = SDHCI_QUIRK_MISSING_CAPS |
299 SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
300 SDHCI_QUIRK_BROKEN_DMA |
301 SDHCI_QUIRK_BROKEN_ADMA,
302 .ops = &sdhci_iproc_ops,
305 #define BCM7211A0_BASE_CLK_MHZ 100
306 static const struct sdhci_iproc_data bcm7211a0_data = {
307 .pdata = &sdhci_bcm7211a0_pltfm_data,
308 .caps = ((BCM7211A0_BASE_CLK_MHZ / 2) << SDHCI_TIMEOUT_CLK_SHIFT) |
309 (BCM7211A0_BASE_CLK_MHZ << SDHCI_CLOCK_BASE_SHIFT) |
310 ((0x2 << SDHCI_MAX_BLOCK_SHIFT)
311 & SDHCI_MAX_BLOCK_MASK) |
314 SDHCI_CAN_DO_SUSPEND |
316 .caps1 = SDHCI_DRIVER_TYPE_C |
320 static const struct of_device_id sdhci_iproc_of_match[] = {
321 { .compatible = "brcm,bcm2835-sdhci", .data = &bcm2835_data },
322 { .compatible = "brcm,bcm2711-emmc2", .data = &bcm2711_data },
323 { .compatible = "brcm,sdhci-iproc-cygnus", .data = &iproc_cygnus_data},
324 { .compatible = "brcm,sdhci-iproc", .data = &iproc_data },
325 { .compatible = "brcm,bcm7211a0-sdhci", .data = &bcm7211a0_data },
328 MODULE_DEVICE_TABLE(of, sdhci_iproc_of_match);
332 * This is a duplicate of bcm2835_(pltfrm_)data without caps quirks
333 * which are provided by the ACPI table.
335 static const struct sdhci_pltfm_data sdhci_bcm_arasan_data = {
336 .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION |
337 SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
338 SDHCI_QUIRK_NO_HISPD_BIT,
339 .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
340 .ops = &sdhci_iproc_32only_ops,
343 static const struct sdhci_iproc_data bcm_arasan_data = {
344 .pdata = &sdhci_bcm_arasan_data,
347 static const struct acpi_device_id sdhci_iproc_acpi_ids[] = {
348 { .id = "BRCM5871", .driver_data = (kernel_ulong_t)&iproc_cygnus_data },
349 { .id = "BRCM5872", .driver_data = (kernel_ulong_t)&iproc_data },
350 { .id = "BCM2847", .driver_data = (kernel_ulong_t)&bcm_arasan_data },
351 { .id = "BRCME88C", .driver_data = (kernel_ulong_t)&bcm2711_data },
354 MODULE_DEVICE_TABLE(acpi, sdhci_iproc_acpi_ids);
357 static int sdhci_iproc_probe(struct platform_device *pdev)
359 struct device *dev = &pdev->dev;
360 const struct sdhci_iproc_data *iproc_data = NULL;
361 struct sdhci_host *host;
362 struct sdhci_iproc_host *iproc_host;
363 struct sdhci_pltfm_host *pltfm_host;
366 iproc_data = device_get_match_data(dev);
370 host = sdhci_pltfm_init(pdev, iproc_data->pdata, sizeof(*iproc_host));
372 return PTR_ERR(host);
374 pltfm_host = sdhci_priv(host);
375 iproc_host = sdhci_pltfm_priv(pltfm_host);
377 iproc_host->data = iproc_data;
379 ret = mmc_of_parse(host->mmc);
383 sdhci_get_property(pdev);
385 host->mmc->caps |= iproc_host->data->mmc_caps;
388 pltfm_host->clk = devm_clk_get(dev, NULL);
389 if (IS_ERR(pltfm_host->clk)) {
390 ret = PTR_ERR(pltfm_host->clk);
393 ret = clk_prepare_enable(pltfm_host->clk);
395 dev_err(dev, "failed to enable host clk\n");
400 if (iproc_host->data->pdata->quirks & SDHCI_QUIRK_MISSING_CAPS) {
401 host->caps = iproc_host->data->caps;
402 host->caps1 = iproc_host->data->caps1;
405 ret = sdhci_add_host(host);
413 clk_disable_unprepare(pltfm_host->clk);
415 sdhci_pltfm_free(pdev);
419 static void sdhci_iproc_shutdown(struct platform_device *pdev)
421 sdhci_pltfm_suspend(&pdev->dev);
424 static struct platform_driver sdhci_iproc_driver = {
426 .name = "sdhci-iproc",
427 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
428 .of_match_table = sdhci_iproc_of_match,
429 .acpi_match_table = ACPI_PTR(sdhci_iproc_acpi_ids),
430 .pm = &sdhci_pltfm_pmops,
432 .probe = sdhci_iproc_probe,
433 .remove = sdhci_pltfm_unregister,
434 .shutdown = sdhci_iproc_shutdown,
436 module_platform_driver(sdhci_iproc_driver);
438 MODULE_AUTHOR("Broadcom");
439 MODULE_DESCRIPTION("IPROC SDHCI driver");
440 MODULE_LICENSE("GPL v2");