vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use virtual console
[linux/fpc-iii.git] / drivers / mmc / host / renesas_sdhi_internal_dmac.c
blob382172fb3da8f55886a27874dbcffd585e4aaf95
1 /*
2 * DMA support for Internal DMAC with SDHI SD/SDIO controller
4 * Copyright (C) 2016-17 Renesas Electronics Corporation
5 * Copyright (C) 2016-17 Horms Solutions, Simon Horman
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/bitops.h>
13 #include <linux/device.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/io-64-nonatomic-hi-lo.h>
16 #include <linux/mfd/tmio.h>
17 #include <linux/mmc/host.h>
18 #include <linux/mod_devicetable.h>
19 #include <linux/module.h>
20 #include <linux/pagemap.h>
21 #include <linux/scatterlist.h>
22 #include <linux/sys_soc.h>
24 #include "renesas_sdhi.h"
25 #include "tmio_mmc.h"
27 #define DM_CM_DTRAN_MODE 0x820
28 #define DM_CM_DTRAN_CTRL 0x828
29 #define DM_CM_RST 0x830
30 #define DM_CM_INFO1 0x840
31 #define DM_CM_INFO1_MASK 0x848
32 #define DM_CM_INFO2 0x850
33 #define DM_CM_INFO2_MASK 0x858
34 #define DM_DTRAN_ADDR 0x880
36 /* DM_CM_DTRAN_MODE */
37 #define DTRAN_MODE_CH_NUM_CH0 0 /* "downstream" = for write commands */
38 #define DTRAN_MODE_CH_NUM_CH1 BIT(16) /* "uptream" = for read commands */
39 #define DTRAN_MODE_BUS_WID_TH (BIT(5) | BIT(4))
40 #define DTRAN_MODE_ADDR_MODE BIT(0) /* 1 = Increment address */
42 /* DM_CM_DTRAN_CTRL */
43 #define DTRAN_CTRL_DM_START BIT(0)
45 /* DM_CM_RST */
46 #define RST_DTRANRST1 BIT(9)
47 #define RST_DTRANRST0 BIT(8)
48 #define RST_RESERVED_BITS GENMASK_ULL(31, 0)
50 /* DM_CM_INFO1 and DM_CM_INFO1_MASK */
51 #define INFO1_CLEAR 0
52 #define INFO1_MASK_CLEAR GENMASK_ULL(31, 0)
53 #define INFO1_DTRANEND1 BIT(17)
54 #define INFO1_DTRANEND0 BIT(16)
56 /* DM_CM_INFO2 and DM_CM_INFO2_MASK */
57 #define INFO2_MASK_CLEAR GENMASK_ULL(31, 0)
58 #define INFO2_DTRANERR1 BIT(17)
59 #define INFO2_DTRANERR0 BIT(16)
62 * Specification of this driver:
63 * - host->chan_{rx,tx} will be used as a flag of enabling/disabling the dma
64 * - Since this SDHI DMAC register set has 16 but 32-bit width, we
65 * need a custom accessor.
68 static unsigned long global_flags;
70 * Workaround for avoiding to use RX DMAC by multiple channels.
71 * On R-Car H3 ES1.* and M3-W ES1.0, when multiple SDHI channels use
72 * RX DMAC simultaneously, sometimes hundreds of bytes data are not
73 * stored into the system memory even if the DMAC interrupt happened.
74 * So, this driver then uses one RX DMAC channel only.
76 #define SDHI_INTERNAL_DMAC_ONE_RX_ONLY 0
77 #define SDHI_INTERNAL_DMAC_RX_IN_USE 1
79 /* Definitions for sampling clocks */
80 static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = {
82 .clk_rate = 0,
83 .tap = 0x00000300,
87 static const struct renesas_sdhi_of_data of_rcar_r8a7795_compatible = {
88 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
89 TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2 |
90 TMIO_MMC_HAVE_4TAP_HS400,
91 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
92 MMC_CAP_CMD23,
93 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
94 .bus_shift = 2,
95 .scc_offset = 0x1000,
96 .taps = rcar_gen3_scc_taps,
97 .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps),
98 /* DMAC can handle 0xffffffff blk count but only 1 segment */
99 .max_blk_count = 0xffffffff,
100 .max_segs = 1,
103 static const struct renesas_sdhi_of_data of_rcar_gen3_compatible = {
104 .tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
105 TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
106 .capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
107 MMC_CAP_CMD23,
108 .capabilities2 = MMC_CAP2_NO_WRITE_PROTECT,
109 .bus_shift = 2,
110 .scc_offset = 0x1000,
111 .taps = rcar_gen3_scc_taps,
112 .taps_num = ARRAY_SIZE(rcar_gen3_scc_taps),
113 /* DMAC can handle 0xffffffff blk count but only 1 segment */
114 .max_blk_count = 0xffffffff,
115 .max_segs = 1,
118 static const struct of_device_id renesas_sdhi_internal_dmac_of_match[] = {
119 { .compatible = "renesas,sdhi-r8a7795", .data = &of_rcar_r8a7795_compatible, },
120 { .compatible = "renesas,sdhi-r8a7796", .data = &of_rcar_r8a7795_compatible, },
121 { .compatible = "renesas,rcar-gen3-sdhi", .data = &of_rcar_gen3_compatible, },
124 MODULE_DEVICE_TABLE(of, renesas_sdhi_internal_dmac_of_match);
126 static void
127 renesas_sdhi_internal_dmac_dm_write(struct tmio_mmc_host *host,
128 int addr, u64 val)
130 writeq(val, host->ctl + addr);
133 static void
134 renesas_sdhi_internal_dmac_enable_dma(struct tmio_mmc_host *host, bool enable)
136 struct renesas_sdhi *priv = host_to_priv(host);
138 if (!host->chan_tx || !host->chan_rx)
139 return;
141 if (!enable)
142 renesas_sdhi_internal_dmac_dm_write(host, DM_CM_INFO1,
143 INFO1_CLEAR);
145 if (priv->dma_priv.enable)
146 priv->dma_priv.enable(host, enable);
149 static void
150 renesas_sdhi_internal_dmac_abort_dma(struct tmio_mmc_host *host) {
151 u64 val = RST_DTRANRST1 | RST_DTRANRST0;
153 renesas_sdhi_internal_dmac_enable_dma(host, false);
155 renesas_sdhi_internal_dmac_dm_write(host, DM_CM_RST,
156 RST_RESERVED_BITS & ~val);
157 renesas_sdhi_internal_dmac_dm_write(host, DM_CM_RST,
158 RST_RESERVED_BITS | val);
160 clear_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags);
162 renesas_sdhi_internal_dmac_enable_dma(host, true);
165 static void
166 renesas_sdhi_internal_dmac_dataend_dma(struct tmio_mmc_host *host) {
167 struct renesas_sdhi *priv = host_to_priv(host);
169 tasklet_schedule(&priv->dma_priv.dma_complete);
172 static void
173 renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host,
174 struct mmc_data *data)
176 struct scatterlist *sg = host->sg_ptr;
177 u32 dtran_mode = DTRAN_MODE_BUS_WID_TH | DTRAN_MODE_ADDR_MODE;
179 if (!dma_map_sg(&host->pdev->dev, sg, host->sg_len,
180 mmc_get_dma_dir(data)))
181 goto force_pio;
183 /* This DMAC cannot handle if buffer is not 8-bytes alignment */
184 if (!IS_ALIGNED(sg_dma_address(sg), 8))
185 goto force_pio_with_unmap;
187 if (data->flags & MMC_DATA_READ) {
188 dtran_mode |= DTRAN_MODE_CH_NUM_CH1;
189 if (test_bit(SDHI_INTERNAL_DMAC_ONE_RX_ONLY, &global_flags) &&
190 test_and_set_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags))
191 goto force_pio_with_unmap;
192 } else {
193 dtran_mode |= DTRAN_MODE_CH_NUM_CH0;
196 renesas_sdhi_internal_dmac_enable_dma(host, true);
198 /* set dma parameters */
199 renesas_sdhi_internal_dmac_dm_write(host, DM_CM_DTRAN_MODE,
200 dtran_mode);
201 renesas_sdhi_internal_dmac_dm_write(host, DM_DTRAN_ADDR,
202 sg_dma_address(sg));
204 return;
206 force_pio_with_unmap:
207 dma_unmap_sg(&host->pdev->dev, sg, host->sg_len, mmc_get_dma_dir(data));
209 force_pio:
210 host->force_pio = true;
211 renesas_sdhi_internal_dmac_enable_dma(host, false);
214 static void renesas_sdhi_internal_dmac_issue_tasklet_fn(unsigned long arg)
216 struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
218 tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
220 /* start the DMAC */
221 renesas_sdhi_internal_dmac_dm_write(host, DM_CM_DTRAN_CTRL,
222 DTRAN_CTRL_DM_START);
225 static void renesas_sdhi_internal_dmac_complete_tasklet_fn(unsigned long arg)
227 struct tmio_mmc_host *host = (struct tmio_mmc_host *)arg;
228 enum dma_data_direction dir;
230 spin_lock_irq(&host->lock);
232 if (!host->data)
233 goto out;
235 if (host->data->flags & MMC_DATA_READ)
236 dir = DMA_FROM_DEVICE;
237 else
238 dir = DMA_TO_DEVICE;
240 renesas_sdhi_internal_dmac_enable_dma(host, false);
241 dma_unmap_sg(&host->pdev->dev, host->sg_ptr, host->sg_len, dir);
243 if (dir == DMA_FROM_DEVICE)
244 clear_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags);
246 tmio_mmc_do_data_irq(host);
247 out:
248 spin_unlock_irq(&host->lock);
251 static void
252 renesas_sdhi_internal_dmac_request_dma(struct tmio_mmc_host *host,
253 struct tmio_mmc_data *pdata)
255 struct renesas_sdhi *priv = host_to_priv(host);
257 /* Disable DMAC interrupts, we don't use them */
258 renesas_sdhi_internal_dmac_dm_write(host, DM_CM_INFO1_MASK,
259 INFO1_MASK_CLEAR);
260 renesas_sdhi_internal_dmac_dm_write(host, DM_CM_INFO2_MASK,
261 INFO2_MASK_CLEAR);
263 /* Each value is set to non-zero to assume "enabling" each DMA */
264 host->chan_rx = host->chan_tx = (void *)0xdeadbeaf;
266 tasklet_init(&priv->dma_priv.dma_complete,
267 renesas_sdhi_internal_dmac_complete_tasklet_fn,
268 (unsigned long)host);
269 tasklet_init(&host->dma_issue,
270 renesas_sdhi_internal_dmac_issue_tasklet_fn,
271 (unsigned long)host);
274 static void
275 renesas_sdhi_internal_dmac_release_dma(struct tmio_mmc_host *host)
277 /* Each value is set to zero to assume "disabling" each DMA */
278 host->chan_rx = host->chan_tx = NULL;
281 static const struct tmio_mmc_dma_ops renesas_sdhi_internal_dmac_dma_ops = {
282 .start = renesas_sdhi_internal_dmac_start_dma,
283 .enable = renesas_sdhi_internal_dmac_enable_dma,
284 .request = renesas_sdhi_internal_dmac_request_dma,
285 .release = renesas_sdhi_internal_dmac_release_dma,
286 .abort = renesas_sdhi_internal_dmac_abort_dma,
287 .dataend = renesas_sdhi_internal_dmac_dataend_dma,
291 * Whitelist of specific R-Car Gen3 SoC ES versions to use this DMAC
292 * implementation as others may use a different implementation.
294 static const struct soc_device_attribute gen3_soc_whitelist[] = {
295 /* specific ones */
296 { .soc_id = "r8a7795", .revision = "ES1.*",
297 .data = (void *)BIT(SDHI_INTERNAL_DMAC_ONE_RX_ONLY) },
298 { .soc_id = "r8a7796", .revision = "ES1.0",
299 .data = (void *)BIT(SDHI_INTERNAL_DMAC_ONE_RX_ONLY) },
300 /* generic ones */
301 { .soc_id = "r8a774a1" },
302 { .soc_id = "r8a7795" },
303 { .soc_id = "r8a7796" },
304 { .soc_id = "r8a77965" },
305 { .soc_id = "r8a77980" },
306 { .soc_id = "r8a77995" },
307 { /* sentinel */ }
310 static int renesas_sdhi_internal_dmac_probe(struct platform_device *pdev)
312 const struct soc_device_attribute *soc = soc_device_match(gen3_soc_whitelist);
313 struct device *dev = &pdev->dev;
315 if (!soc)
316 return -ENODEV;
318 global_flags |= (unsigned long)soc->data;
320 dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms), GFP_KERNEL);
321 if (!dev->dma_parms)
322 return -ENOMEM;
324 /* value is max of SD_SECCNT. Confirmed by HW engineers */
325 dma_set_max_seg_size(dev, 0xffffffff);
327 return renesas_sdhi_probe(pdev, &renesas_sdhi_internal_dmac_dma_ops);
330 static const struct dev_pm_ops renesas_sdhi_internal_dmac_dev_pm_ops = {
331 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
332 pm_runtime_force_resume)
333 SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
334 tmio_mmc_host_runtime_resume,
335 NULL)
338 static struct platform_driver renesas_internal_dmac_sdhi_driver = {
339 .driver = {
340 .name = "renesas_sdhi_internal_dmac",
341 .pm = &renesas_sdhi_internal_dmac_dev_pm_ops,
342 .of_match_table = renesas_sdhi_internal_dmac_of_match,
344 .probe = renesas_sdhi_internal_dmac_probe,
345 .remove = renesas_sdhi_remove,
348 module_platform_driver(renesas_internal_dmac_sdhi_driver);
350 MODULE_DESCRIPTION("Renesas SDHI driver for internal DMAC");
351 MODULE_AUTHOR("Yoshihiro Shimoda");
352 MODULE_LICENSE("GPL v2");