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Linux/drivers/mmc/host/sdhci-of-esdhc.c

  1 /*
  2  * Freescale eSDHC controller driver.
  3  *
  4  * Copyright (c) 2007, 2010, 2012 Freescale Semiconductor, Inc.
  5  * Copyright (c) 2009 MontaVista Software, Inc.
  6  *
  7  * Authors: Xiaobo Xie <X.Xie@freescale.com>
  8  *          Anton Vorontsov <avorontsov@ru.mvista.com>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or (at
 13  * your option) any later version.
 14  */
 15 
 16 #include <linux/err.h>
 17 #include <linux/io.h>
 18 #include <linux/of.h>
 19 #include <linux/delay.h>
 20 #include <linux/module.h>
 21 #include <linux/mmc/host.h>
 22 #include "sdhci-pltfm.h"
 23 #include "sdhci-esdhc.h"
 24 
 25 #define VENDOR_V_22     0x12
 26 #define VENDOR_V_23     0x13
 27 static u32 esdhc_readl(struct sdhci_host *host, int reg)
 28 {
 29         u32 ret;
 30 
 31         ret = in_be32(host->ioaddr + reg);
 32         /*
 33          * The bit of ADMA flag in eSDHC is not compatible with standard
 34          * SDHC register, so set fake flag SDHCI_CAN_DO_ADMA2 when ADMA is
 35          * supported by eSDHC.
 36          * And for many FSL eSDHC controller, the reset value of field
 37          * SDHCI_CAN_DO_ADMA1 is one, but some of them can't support ADMA,
 38          * only these vendor version is greater than 2.2/0x12 support ADMA.
 39          * For FSL eSDHC, must aligned 4-byte, so use 0xFC to read the
 40          * the verdor version number, oxFE is SDHCI_HOST_VERSION.
 41          */
 42         if ((reg == SDHCI_CAPABILITIES) && (ret & SDHCI_CAN_DO_ADMA1)) {
 43                 u32 tmp = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
 44                 tmp = (tmp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
 45                 if (tmp > VENDOR_V_22)
 46                         ret |= SDHCI_CAN_DO_ADMA2;
 47         }
 48 
 49         return ret;
 50 }
 51 
 52 static u16 esdhc_readw(struct sdhci_host *host, int reg)
 53 {
 54         u16 ret;
 55         int base = reg & ~0x3;
 56         int shift = (reg & 0x2) * 8;
 57 
 58         if (unlikely(reg == SDHCI_HOST_VERSION))
 59                 ret = in_be32(host->ioaddr + base) & 0xffff;
 60         else
 61                 ret = (in_be32(host->ioaddr + base) >> shift) & 0xffff;
 62         return ret;
 63 }
 64 
 65 static u8 esdhc_readb(struct sdhci_host *host, int reg)
 66 {
 67         int base = reg & ~0x3;
 68         int shift = (reg & 0x3) * 8;
 69         u8 ret = (in_be32(host->ioaddr + base) >> shift) & 0xff;
 70 
 71         /*
 72          * "DMA select" locates at offset 0x28 in SD specification, but on
 73          * P5020 or P3041, it locates at 0x29.
 74          */
 75         if (reg == SDHCI_HOST_CONTROL) {
 76                 u32 dma_bits;
 77 
 78                 dma_bits = in_be32(host->ioaddr + reg);
 79                 /* DMA select is 22,23 bits in Protocol Control Register */
 80                 dma_bits = (dma_bits >> 5) & SDHCI_CTRL_DMA_MASK;
 81 
 82                 /* fixup the result */
 83                 ret &= ~SDHCI_CTRL_DMA_MASK;
 84                 ret |= dma_bits;
 85         }
 86 
 87         return ret;
 88 }
 89 
 90 static void esdhc_writel(struct sdhci_host *host, u32 val, int reg)
 91 {
 92         /*
 93          * Enable IRQSTATEN[BGESEN] is just to set IRQSTAT[BGE]
 94          * when SYSCTL[RSTD]) is set for some special operations.
 95          * No any impact other operation.
 96          */
 97         if (reg == SDHCI_INT_ENABLE)
 98                 val |= SDHCI_INT_BLK_GAP;
 99         sdhci_be32bs_writel(host, val, reg);
100 }
101 
102 static void esdhc_writew(struct sdhci_host *host, u16 val, int reg)
103 {
104         if (reg == SDHCI_BLOCK_SIZE) {
105                 /*
106                  * Two last DMA bits are reserved, and first one is used for
107                  * non-standard blksz of 4096 bytes that we don't support
108                  * yet. So clear the DMA boundary bits.
109                  */
110                 val &= ~SDHCI_MAKE_BLKSZ(0x7, 0);
111         }
112         sdhci_be32bs_writew(host, val, reg);
113 }
114 
115 static void esdhc_writeb(struct sdhci_host *host, u8 val, int reg)
116 {
117         /*
118          * "DMA select" location is offset 0x28 in SD specification, but on
119          * P5020 or P3041, it's located at 0x29.
120          */
121         if (reg == SDHCI_HOST_CONTROL) {
122                 u32 dma_bits;
123 
124                 /*
125                  * If host control register is not standard, exit
126                  * this function
127                  */
128                 if (host->quirks2 & SDHCI_QUIRK2_BROKEN_HOST_CONTROL)
129                         return;
130 
131                 /* DMA select is 22,23 bits in Protocol Control Register */
132                 dma_bits = (val & SDHCI_CTRL_DMA_MASK) << 5;
133                 clrsetbits_be32(host->ioaddr + reg , SDHCI_CTRL_DMA_MASK << 5,
134                         dma_bits);
135                 val &= ~SDHCI_CTRL_DMA_MASK;
136                 val |= in_be32(host->ioaddr + reg) & SDHCI_CTRL_DMA_MASK;
137         }
138 
139         /* Prevent SDHCI core from writing reserved bits (e.g. HISPD). */
140         if (reg == SDHCI_HOST_CONTROL)
141                 val &= ~ESDHC_HOST_CONTROL_RES;
142         sdhci_be32bs_writeb(host, val, reg);
143 }
144 
145 /*
146  * For Abort or Suspend after Stop at Block Gap, ignore the ADMA
147  * error(IRQSTAT[ADMAE]) if both Transfer Complete(IRQSTAT[TC])
148  * and Block Gap Event(IRQSTAT[BGE]) are also set.
149  * For Continue, apply soft reset for data(SYSCTL[RSTD]);
150  * and re-issue the entire read transaction from beginning.
151  */
152 static void esdhci_of_adma_workaround(struct sdhci_host *host, u32 intmask)
153 {
154         u32 tmp;
155         bool applicable;
156         dma_addr_t dmastart;
157         dma_addr_t dmanow;
158 
159         tmp = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
160         tmp = (tmp & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
161 
162         applicable = (intmask & SDHCI_INT_DATA_END) &&
163                 (intmask & SDHCI_INT_BLK_GAP) &&
164                 (tmp == VENDOR_V_23);
165         if (!applicable)
166                 return;
167 
168         host->data->error = 0;
169         dmastart = sg_dma_address(host->data->sg);
170         dmanow = dmastart + host->data->bytes_xfered;
171         /*
172          * Force update to the next DMA block boundary.
173          */
174         dmanow = (dmanow & ~(SDHCI_DEFAULT_BOUNDARY_SIZE - 1)) +
175                 SDHCI_DEFAULT_BOUNDARY_SIZE;
176         host->data->bytes_xfered = dmanow - dmastart;
177         sdhci_writel(host, dmanow, SDHCI_DMA_ADDRESS);
178 }
179 
180 static int esdhc_of_enable_dma(struct sdhci_host *host)
181 {
182         setbits32(host->ioaddr + ESDHC_DMA_SYSCTL, ESDHC_DMA_SNOOP);
183         return 0;
184 }
185 
186 static unsigned int esdhc_of_get_max_clock(struct sdhci_host *host)
187 {
188         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
189 
190         return pltfm_host->clock;
191 }
192 
193 static unsigned int esdhc_of_get_min_clock(struct sdhci_host *host)
194 {
195         struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
196 
197         return pltfm_host->clock / 256 / 16;
198 }
199 
200 static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
201 {
202         int pre_div = 2;
203         int div = 1;
204         u32 temp;
205 
206         host->mmc->actual_clock = 0;
207 
208         if (clock == 0)
209                 return;
210 
211         /* Workaround to reduce the clock frequency for p1010 esdhc */
212         if (of_find_compatible_node(NULL, NULL, "fsl,p1010-esdhc")) {
213                 if (clock > 20000000)
214                         clock -= 5000000;
215                 if (clock > 40000000)
216                         clock -= 5000000;
217         }
218 
219         temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
220         temp &= ~(ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
221                 | ESDHC_CLOCK_MASK);
222         sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
223 
224         while (host->max_clk / pre_div / 16 > clock && pre_div < 256)
225                 pre_div *= 2;
226 
227         while (host->max_clk / pre_div / div > clock && div < 16)
228                 div++;
229 
230         dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
231                 clock, host->max_clk / pre_div / div);
232 
233         pre_div >>= 1;
234         div--;
235 
236         temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
237         temp |= (ESDHC_CLOCK_IPGEN | ESDHC_CLOCK_HCKEN | ESDHC_CLOCK_PEREN
238                 | (div << ESDHC_DIVIDER_SHIFT)
239                 | (pre_div << ESDHC_PREDIV_SHIFT));
240         sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
241         mdelay(1);
242 }
243 
244 static void esdhc_of_platform_init(struct sdhci_host *host)
245 {
246         u32 vvn;
247 
248         vvn = in_be32(host->ioaddr + SDHCI_SLOT_INT_STATUS);
249         vvn = (vvn & SDHCI_VENDOR_VER_MASK) >> SDHCI_VENDOR_VER_SHIFT;
250         if (vvn == VENDOR_V_22)
251                 host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
252 
253         if (vvn > VENDOR_V_22)
254                 host->quirks &= ~SDHCI_QUIRK_NO_BUSY_IRQ;
255 }
256 
257 static void esdhc_pltfm_set_bus_width(struct sdhci_host *host, int width)
258 {
259         u32 ctrl;
260 
261         switch (width) {
262         case MMC_BUS_WIDTH_8:
263                 ctrl = ESDHC_CTRL_8BITBUS;
264                 break;
265 
266         case MMC_BUS_WIDTH_4:
267                 ctrl = ESDHC_CTRL_4BITBUS;
268                 break;
269 
270         default:
271                 ctrl = 0;
272                 break;
273         }
274 
275         clrsetbits_be32(host->ioaddr + SDHCI_HOST_CONTROL,
276                         ESDHC_CTRL_BUSWIDTH_MASK, ctrl);
277 }
278 
279 static void esdhc_reset(struct sdhci_host *host, u8 mask)
280 {
281         sdhci_reset(host, mask);
282 
283         sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
284         sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
285 }
286 
287 static const struct sdhci_ops sdhci_esdhc_ops = {
288         .read_l = esdhc_readl,
289         .read_w = esdhc_readw,
290         .read_b = esdhc_readb,
291         .write_l = esdhc_writel,
292         .write_w = esdhc_writew,
293         .write_b = esdhc_writeb,
294         .set_clock = esdhc_of_set_clock,
295         .enable_dma = esdhc_of_enable_dma,
296         .get_max_clock = esdhc_of_get_max_clock,
297         .get_min_clock = esdhc_of_get_min_clock,
298         .platform_init = esdhc_of_platform_init,
299         .adma_workaround = esdhci_of_adma_workaround,
300         .set_bus_width = esdhc_pltfm_set_bus_width,
301         .reset = esdhc_reset,
302         .set_uhs_signaling = sdhci_set_uhs_signaling,
303 };
304 
305 #ifdef CONFIG_PM
306 
307 static u32 esdhc_proctl;
308 static int esdhc_of_suspend(struct device *dev)
309 {
310         struct sdhci_host *host = dev_get_drvdata(dev);
311 
312         esdhc_proctl = sdhci_be32bs_readl(host, SDHCI_HOST_CONTROL);
313 
314         return sdhci_suspend_host(host);
315 }
316 
317 static int esdhc_of_resume(struct device *dev)
318 {
319         struct sdhci_host *host = dev_get_drvdata(dev);
320         int ret = sdhci_resume_host(host);
321 
322         if (ret == 0) {
323                 /* Isn't this already done by sdhci_resume_host() ? --rmk */
324                 esdhc_of_enable_dma(host);
325                 sdhci_be32bs_writel(host, esdhc_proctl, SDHCI_HOST_CONTROL);
326         }
327 
328         return ret;
329 }
330 
331 static const struct dev_pm_ops esdhc_pmops = {
332         .suspend        = esdhc_of_suspend,
333         .resume         = esdhc_of_resume,
334 };
335 #define ESDHC_PMOPS (&esdhc_pmops)
336 #else
337 #define ESDHC_PMOPS NULL
338 #endif
339 
340 static const struct sdhci_pltfm_data sdhci_esdhc_pdata = {
341         /*
342          * card detection could be handled via GPIO
343          * eSDHC cannot support End Attribute in NOP ADMA descriptor
344          */
345         .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_CARD_DETECTION
346                 | SDHCI_QUIRK_NO_CARD_NO_RESET
347                 | SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
348         .ops = &sdhci_esdhc_ops,
349 };
350 
351 static int sdhci_esdhc_probe(struct platform_device *pdev)
352 {
353         struct sdhci_host *host;
354         struct device_node *np;
355         int ret;
356 
357         host = sdhci_pltfm_init(pdev, &sdhci_esdhc_pdata, 0);
358         if (IS_ERR(host))
359                 return PTR_ERR(host);
360 
361         sdhci_get_of_property(pdev);
362 
363         np = pdev->dev.of_node;
364         if (of_device_is_compatible(np, "fsl,p2020-esdhc")) {
365                 /*
366                  * Freescale messed up with P2020 as it has a non-standard
367                  * host control register
368                  */
369                 host->quirks2 |= SDHCI_QUIRK2_BROKEN_HOST_CONTROL;
370         }
371 
372         /* call to generic mmc_of_parse to support additional capabilities */
373         ret = mmc_of_parse(host->mmc);
374         if (ret)
375                 goto err;
376 
377         mmc_of_parse_voltage(np, &host->ocr_mask);
378 
379         ret = sdhci_add_host(host);
380         if (ret)
381                 goto err;
382 
383         return 0;
384  err:
385         sdhci_pltfm_free(pdev);
386         return ret;
387 }
388 
389 static int sdhci_esdhc_remove(struct platform_device *pdev)
390 {
391         return sdhci_pltfm_unregister(pdev);
392 }
393 
394 static const struct of_device_id sdhci_esdhc_of_match[] = {
395         { .compatible = "fsl,mpc8379-esdhc" },
396         { .compatible = "fsl,mpc8536-esdhc" },
397         { .compatible = "fsl,esdhc" },
398         { }
399 };
400 MODULE_DEVICE_TABLE(of, sdhci_esdhc_of_match);
401 
402 static struct platform_driver sdhci_esdhc_driver = {
403         .driver = {
404                 .name = "sdhci-esdhc",
405                 .of_match_table = sdhci_esdhc_of_match,
406                 .pm = ESDHC_PMOPS,
407         },
408         .probe = sdhci_esdhc_probe,
409         .remove = sdhci_esdhc_remove,
410 };
411 
412 module_platform_driver(sdhci_esdhc_driver);
413 
414 MODULE_DESCRIPTION("SDHCI OF driver for Freescale MPC eSDHC");
415 MODULE_AUTHOR("Xiaobo Xie <X.Xie@freescale.com>, "
416               "Anton Vorontsov <avorontsov@ru.mvista.com>");
417 MODULE_LICENSE("GPL v2");
418 

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