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tmio_mmc.h
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1 /*
2  * linux/drivers/mmc/host/tmio_mmc.h
3  *
4  * Copyright (C) 2007 Ian Molton
5  * Copyright (C) 2004 Ian Molton
6  *
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.
10  *
11  * Driver for the MMC / SD / SDIO cell found in:
12  *
13  * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
14  */
15 
16 #ifndef TMIO_MMC_H
17 #define TMIO_MMC_H
18 
19 #include <linux/highmem.h>
20 #include <linux/mmc/tmio.h>
21 #include <linux/mutex.h>
22 #include <linux/pagemap.h>
23 #include <linux/scatterlist.h>
24 #include <linux/spinlock.h>
25 
26 /* Definitions for values the CTRL_SDIO_STATUS register can take. */
27 #define TMIO_SDIO_STAT_IOIRQ 0x0001
28 #define TMIO_SDIO_STAT_EXPUB52 0x4000
29 #define TMIO_SDIO_STAT_EXWT 0x8000
30 #define TMIO_SDIO_MASK_ALL 0xc007
31 
32 /* Define some IRQ masks */
33 /* This is the mask used at reset by the chip */
34 #define TMIO_MASK_ALL 0x837f031d
35 #define TMIO_MASK_READOP (TMIO_STAT_RXRDY | TMIO_STAT_DATAEND)
36 #define TMIO_MASK_WRITEOP (TMIO_STAT_TXRQ | TMIO_STAT_DATAEND)
37 #define TMIO_MASK_CMD (TMIO_STAT_CMDRESPEND | TMIO_STAT_CMDTIMEOUT | \
38  TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT)
39 #define TMIO_MASK_IRQ (TMIO_MASK_READOP | TMIO_MASK_WRITEOP | TMIO_MASK_CMD)
40 
41 struct tmio_mmc_data;
42 
43 struct tmio_mmc_host {
44  void __iomem *ctl;
45  unsigned long bus_shift;
46  struct mmc_command *cmd;
47  struct mmc_request *mrq;
48  struct mmc_data *data;
49  struct mmc_host *mmc;
50 
51  /* Controller power state */
52  bool power;
53 
54  /* Callbacks for clock / power control */
55  void (*set_pwr)(struct platform_device *host, int state);
56  void (*set_clk_div)(struct platform_device *host, int state);
57 
58  /* pio related stuff */
59  struct scatterlist *sg_ptr;
60  struct scatterlist *sg_orig;
61  unsigned int sg_len;
62  unsigned int sg_off;
63 
64  struct platform_device *pdev;
65  struct tmio_mmc_data *pdata;
66 
67  /* DMA support */
68  bool force_pio;
69  struct dma_chan *chan_rx;
70  struct dma_chan *chan_tx;
71  struct tasklet_struct dma_complete;
72  struct tasklet_struct dma_issue;
73  struct scatterlist bounce_sg;
74  u8 *bounce_buf;
75 
76  /* Track lost interrupts */
77  struct delayed_work delayed_reset_work;
78  struct work_struct done;
79 
80  /* Cache IRQ mask */
81  u32 sdcard_irq_mask;
82  u32 sdio_irq_mask;
83 
84  spinlock_t lock; /* protect host private data */
85  unsigned long last_req_ts;
86  struct mutex ios_lock; /* protect set_ios() context */
87  bool native_hotplug;
88 };
89 
90 int tmio_mmc_host_probe(struct tmio_mmc_host **host,
91  struct platform_device *pdev,
92  struct tmio_mmc_data *pdata);
93 void tmio_mmc_host_remove(struct tmio_mmc_host *host);
94 void tmio_mmc_do_data_irq(struct tmio_mmc_host *host);
95 
96 void tmio_mmc_enable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
97 void tmio_mmc_disable_mmc_irqs(struct tmio_mmc_host *host, u32 i);
98 irqreturn_t tmio_mmc_irq(int irq, void *devid);
99 irqreturn_t tmio_mmc_sdcard_irq(int irq, void *devid);
100 irqreturn_t tmio_mmc_card_detect_irq(int irq, void *devid);
101 irqreturn_t tmio_mmc_sdio_irq(int irq, void *devid);
102 
103 static inline char *tmio_mmc_kmap_atomic(struct scatterlist *sg,
104  unsigned long *flags)
105 {
106  local_irq_save(*flags);
107  return kmap_atomic(sg_page(sg)) + sg->offset;
108 }
109 
110 static inline void tmio_mmc_kunmap_atomic(struct scatterlist *sg,
111  unsigned long *flags, void *virt)
112 {
113  kunmap_atomic(virt - sg->offset);
114  local_irq_restore(*flags);
115 }
116 
117 #if defined(CONFIG_MMC_SDHI) || defined(CONFIG_MMC_SDHI_MODULE)
118 void tmio_mmc_start_dma(struct tmio_mmc_host *host, struct mmc_data *data);
119 void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable);
120 void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata);
121 void tmio_mmc_release_dma(struct tmio_mmc_host *host);
122 void tmio_mmc_abort_dma(struct tmio_mmc_host *host);
123 #else
124 static inline void tmio_mmc_start_dma(struct tmio_mmc_host *host,
125  struct mmc_data *data)
126 {
127 }
128 
129 static inline void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable)
130 {
131 }
132 
133 static inline void tmio_mmc_request_dma(struct tmio_mmc_host *host,
134  struct tmio_mmc_data *pdata)
135 {
136  host->chan_tx = NULL;
137  host->chan_rx = NULL;
138 }
139 
140 static inline void tmio_mmc_release_dma(struct tmio_mmc_host *host)
141 {
142 }
143 
144 static inline void tmio_mmc_abort_dma(struct tmio_mmc_host *host)
145 {
146 }
147 #endif
148 
149 #ifdef CONFIG_PM
150 int tmio_mmc_host_suspend(struct device *dev);
151 int tmio_mmc_host_resume(struct device *dev);
152 #else
153 #define tmio_mmc_host_suspend NULL
154 #define tmio_mmc_host_resume NULL
155 #endif
156 
157 int tmio_mmc_host_runtime_suspend(struct device *dev);
158 int tmio_mmc_host_runtime_resume(struct device *dev);
159 
160 static inline u16 sd_ctrl_read16(struct tmio_mmc_host *host, int addr)
161 {
162  return readw(host->ctl + (addr << host->bus_shift));
163 }
164 
165 static inline void sd_ctrl_read16_rep(struct tmio_mmc_host *host, int addr,
166  u16 *buf, int count)
167 {
168  readsw(host->ctl + (addr << host->bus_shift), buf, count);
169 }
170 
171 static inline u32 sd_ctrl_read32(struct tmio_mmc_host *host, int addr)
172 {
173  return readw(host->ctl + (addr << host->bus_shift)) |
174  readw(host->ctl + ((addr + 2) << host->bus_shift)) << 16;
175 }
176 
177 static inline void sd_ctrl_write16(struct tmio_mmc_host *host, int addr, u16 val)
178 {
179  /* If there is a hook and it returns non-zero then there
180  * is an error and the write should be skipped
181  */
182  if (host->pdata->write16_hook && host->pdata->write16_hook(host, addr))
183  return;
184  writew(val, host->ctl + (addr << host->bus_shift));
185 }
186 
187 static inline void sd_ctrl_write16_rep(struct tmio_mmc_host *host, int addr,
188  u16 *buf, int count)
189 {
190  writesw(host->ctl + (addr << host->bus_shift), buf, count);
191 }
192 
193 static inline void sd_ctrl_write32(struct tmio_mmc_host *host, int addr, u32 val)
194 {
195  writew(val, host->ctl + (addr << host->bus_shift));
196  writew(val >> 16, host->ctl + ((addr + 2) << host->bus_shift));
197 }
198 
199 
200 #endif
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