1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Renesas Mobile SDHI
4  *
5  * Copyright (C) 2017 Horms Solutions Ltd., Simon Horman
6  * Copyright (C) 2017-19 Renesas Electronics Corporation
7  */
8 
9 #ifndef RENESAS_SDHI_H
10 #define RENESAS_SDHI_H
11 
12 #include <linux/platform_device.h>
13 #include "tmio_mmc.h"
14 
15 struct renesas_sdhi_scc {
16 	unsigned long clk_rate;	/* clock rate for SDR104 */
17 	u32 tap;		/* sampling clock position for SDR104/HS400 (8 TAP) */
18 	u32 tap_hs400_4tap;	/* sampling clock position for HS400 (4 TAP) */
19 };
20 
21 #define SDHI_FLAG_NEED_CLKH_FALLBACK	BIT(0)
22 
23 struct renesas_sdhi_of_data {
24 	unsigned long tmio_flags;
25 	u32	      tmio_ocr_mask;
26 	unsigned long capabilities;
27 	unsigned long capabilities2;
28 	enum dma_slave_buswidth dma_buswidth;
29 	dma_addr_t dma_rx_offset;
30 	unsigned int bus_shift;
31 	int scc_offset;
32 	struct renesas_sdhi_scc *taps;
33 	int taps_num;
34 	unsigned int max_blk_count;
35 	unsigned short max_segs;
36 	unsigned long sdhi_flags;
37 };
38 
39 #define SDHI_CALIB_TABLE_MAX 32
40 
41 #define sdhi_has_quirk(p, q) ((p)->quirks && (p)->quirks->q)
42 
43 struct renesas_sdhi_quirks {
44 	bool hs400_disabled;
45 	bool hs400_4taps;
46 	bool fixed_addr_mode;
47 	bool dma_one_rx_only;
48 	bool manual_tap_correction;
49 	bool old_info1_layout;
50 	u32 hs400_bad_taps;
51 	const u8 (*hs400_calib_table)[SDHI_CALIB_TABLE_MAX];
52 };
53 
54 struct renesas_sdhi_of_data_with_quirks {
55 	const struct renesas_sdhi_of_data *of_data;
56 	const struct renesas_sdhi_quirks *quirks;
57 };
58 
59 /* We want both end_flags to be set before we mark DMA as finished */
60 #define SDHI_DMA_END_FLAG_DMA		0
61 #define SDHI_DMA_END_FLAG_ACCESS	1
62 
63 struct renesas_sdhi_dma {
64 	unsigned long end_flags;
65 	enum dma_slave_buswidth dma_buswidth;
66 	bool (*filter)(struct dma_chan *chan, void *arg);
67 	void (*enable)(struct tmio_mmc_host *host, bool enable);
68 	struct completion dma_dataend;
69 	struct tasklet_struct dma_complete;
70 };
71 
72 struct renesas_sdhi {
73 	struct clk *clk;
74 	struct clk *clkh;
75 	struct clk *clk_cd;
76 	struct tmio_mmc_data mmc_data;
77 	struct renesas_sdhi_dma dma_priv;
78 	const struct renesas_sdhi_quirks *quirks;
79 	struct pinctrl *pinctrl;
80 	struct pinctrl_state *pins_default, *pins_uhs;
81 	void __iomem *scc_ctl;
82 	u32 scc_tappos;
83 	u32 scc_tappos_hs400;
84 	const u8 *adjust_hs400_calib_table;
85 	bool needs_adjust_hs400;
86 
87 	/* Tuning values: 1 for success, 0 for failure */
88 	DECLARE_BITMAP(taps, BITS_PER_LONG);
89 	/* Sampling data comparison: 1 for match, 0 for mismatch */
90 	DECLARE_BITMAP(smpcmp, BITS_PER_LONG);
91 	unsigned int tap_num;
92 	unsigned int tap_set;
93 
94 	struct reset_control *rstc;
95 };
96 
97 #define host_to_priv(host) \
98 	container_of((host)->pdata, struct renesas_sdhi, mmc_data)
99 
100 int renesas_sdhi_probe(struct platform_device *pdev,
101 		       const struct tmio_mmc_dma_ops *dma_ops,
102 		       const struct renesas_sdhi_of_data *of_data,
103 		       const struct renesas_sdhi_quirks *quirks);
104 void renesas_sdhi_remove(struct platform_device *pdev);
105 #endif
106