tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Driver for the Intel integrated DMA 64-bit
3 *
4 * Copyright (C) 2015 Intel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#ifndef __DMA_IDMA64_H__
12#define __DMA_IDMA64_H__
13
14#include <linux/device.h>
15#include <linux/io.h>
16#include <linux/spinlock.h>
17#include <linux/types.h>
18
19#include <linux/io-64-nonatomic-lo-hi.h>
20
21#include "virt-dma.h"
22
23/* Channel registers */
24
25#define IDMA64_CH_SAR 0x00 /* Source Address Register */
26#define IDMA64_CH_DAR 0x08 /* Destination Address Register */
27#define IDMA64_CH_LLP 0x10 /* Linked List Pointer */
28#define IDMA64_CH_CTL_LO 0x18 /* Control Register Low */
29#define IDMA64_CH_CTL_HI 0x1c /* Control Register High */
30#define IDMA64_CH_SSTAT 0x20
31#define IDMA64_CH_DSTAT 0x28
32#define IDMA64_CH_SSTATAR 0x30
33#define IDMA64_CH_DSTATAR 0x38
34#define IDMA64_CH_CFG_LO 0x40 /* Configuration Register Low */
35#define IDMA64_CH_CFG_HI 0x44 /* Configuration Register High */
36#define IDMA64_CH_SGR 0x48
37#define IDMA64_CH_DSR 0x50
38
39#define IDMA64_CH_LENGTH 0x58
40
41/* Bitfields in CTL_LO */
42#define IDMA64C_CTLL_INT_EN (1 << 0) /* irqs enabled? */
43#define IDMA64C_CTLL_DST_WIDTH(x) ((x) << 1) /* bytes per element */
44#define IDMA64C_CTLL_SRC_WIDTH(x) ((x) << 4)
45#define IDMA64C_CTLL_DST_INC (0 << 8) /* DAR update/not */
46#define IDMA64C_CTLL_DST_FIX (1 << 8)
47#define IDMA64C_CTLL_SRC_INC (0 << 10) /* SAR update/not */
48#define IDMA64C_CTLL_SRC_FIX (1 << 10)
49#define IDMA64C_CTLL_DST_MSIZE(x) ((x) << 11) /* burst, #elements */
50#define IDMA64C_CTLL_SRC_MSIZE(x) ((x) << 14)
51#define IDMA64C_CTLL_FC_M2P (1 << 20) /* mem-to-periph */
52#define IDMA64C_CTLL_FC_P2M (2 << 20) /* periph-to-mem */
53#define IDMA64C_CTLL_LLP_D_EN (1 << 27) /* dest block chain */
54#define IDMA64C_CTLL_LLP_S_EN (1 << 28) /* src block chain */
55
56/* Bitfields in CTL_HI */
57#define IDMA64C_CTLH_BLOCK_TS_MASK ((1 << 17) - 1)
58#define IDMA64C_CTLH_BLOCK_TS(x) ((x) & IDMA64C_CTLH_BLOCK_TS_MASK)
59#define IDMA64C_CTLH_DONE (1 << 17)
60
61/* Bitfields in CFG_LO */
62#define IDMA64C_CFGL_DST_BURST_ALIGN (1 << 0) /* dst burst align */
63#define IDMA64C_CFGL_SRC_BURST_ALIGN (1 << 1) /* src burst align */
64#define IDMA64C_CFGL_CH_SUSP (1 << 8)
65#define IDMA64C_CFGL_FIFO_EMPTY (1 << 9)
66#define IDMA64C_CFGL_CH_DRAIN (1 << 10) /* drain FIFO */
67#define IDMA64C_CFGL_DST_OPT_BL (1 << 20) /* optimize dst burst length */
68#define IDMA64C_CFGL_SRC_OPT_BL (1 << 21) /* optimize src burst length */
69
70/* Bitfields in CFG_HI */
71#define IDMA64C_CFGH_SRC_PER(x) ((x) << 0) /* src peripheral */
72#define IDMA64C_CFGH_DST_PER(x) ((x) << 4) /* dst peripheral */
73#define IDMA64C_CFGH_RD_ISSUE_THD(x) ((x) << 8)
74#define IDMA64C_CFGH_WR_ISSUE_THD(x) ((x) << 18)
75
76/* Interrupt registers */
77
78#define IDMA64_INT_XFER 0x00
79#define IDMA64_INT_BLOCK 0x08
80#define IDMA64_INT_SRC_TRAN 0x10
81#define IDMA64_INT_DST_TRAN 0x18
82#define IDMA64_INT_ERROR 0x20
83
84#define IDMA64_RAW(x) (0x2c0 + IDMA64_INT_##x) /* r */
85#define IDMA64_STATUS(x) (0x2e8 + IDMA64_INT_##x) /* r (raw & mask) */
86#define IDMA64_MASK(x) (0x310 + IDMA64_INT_##x) /* rw (set = irq enabled) */
87#define IDMA64_CLEAR(x) (0x338 + IDMA64_INT_##x) /* w (ack, affects "raw") */
88
89/* Common registers */
90
91#define IDMA64_STATUS_INT 0x360 /* r */
92#define IDMA64_CFG 0x398
93#define IDMA64_CH_EN 0x3a0
94
95/* Bitfields in CFG */
96#define IDMA64_CFG_DMA_EN (1 << 0)
97
98/* Hardware descriptor for Linked LIst transfers */
99struct idma64_lli {
100 u64 sar;
101 u64 dar;
102 u64 llp;
103 u32 ctllo;
104 u32 ctlhi;
105 u32 sstat;
106 u32 dstat;
107};
108
109struct idma64_hw_desc {
110 struct idma64_lli *lli;
111 dma_addr_t llp;
112 dma_addr_t phys;
113 unsigned int len;
114};
115
116struct idma64_desc {
117 struct virt_dma_desc vdesc;
118 enum dma_transfer_direction direction;
119 struct idma64_hw_desc *hw;
120 unsigned int ndesc;
121 size_t length;
122 enum dma_status status;
123};
124
125static inline struct idma64_desc *to_idma64_desc(struct virt_dma_desc *vdesc)
126{
127 return container_of(vdesc, struct idma64_desc, vdesc);
128}
129
130struct idma64_chan {
131 struct virt_dma_chan vchan;
132
133 void __iomem *regs;
134
135 /* hardware configuration */
136 enum dma_transfer_direction direction;
137 unsigned int mask;
138 struct dma_slave_config config;
139
140 void *pool;
141 struct idma64_desc *desc;
142};
143
144static inline struct idma64_chan *to_idma64_chan(struct dma_chan *chan)
145{
146 return container_of(chan, struct idma64_chan, vchan.chan);
147}
148
149#define channel_set_bit(idma64, reg, mask) \
150 dma_writel(idma64, reg, ((mask) << 8) | (mask))
151#define channel_clear_bit(idma64, reg, mask) \
152 dma_writel(idma64, reg, ((mask) << 8) | 0)
153
154static inline u32 idma64c_readl(struct idma64_chan *idma64c, int offset)
155{
156 return readl(idma64c->regs + offset);
157}
158
159static inline void idma64c_writel(struct idma64_chan *idma64c, int offset,
160 u32 value)
161{
162 writel(value, idma64c->regs + offset);
163}
164
165#define channel_readl(idma64c, reg) \
166 idma64c_readl(idma64c, IDMA64_CH_##reg)
167#define channel_writel(idma64c, reg, value) \
168 idma64c_writel(idma64c, IDMA64_CH_##reg, (value))
169
170static inline u64 idma64c_readq(struct idma64_chan *idma64c, int offset)
171{
172 return lo_hi_readq(idma64c->regs + offset);
173}
174
175static inline void idma64c_writeq(struct idma64_chan *idma64c, int offset,
176 u64 value)
177{
178 lo_hi_writeq(value, idma64c->regs + offset);
179}
180
181#define channel_readq(idma64c, reg) \
182 idma64c_readq(idma64c, IDMA64_CH_##reg)
183#define channel_writeq(idma64c, reg, value) \
184 idma64c_writeq(idma64c, IDMA64_CH_##reg, (value))
185
186struct idma64 {
187 struct dma_device dma;
188
189 void __iomem *regs;
190
191 /* channels */
192 unsigned short all_chan_mask;
193 struct idma64_chan *chan;
194};
195
196static inline struct idma64 *to_idma64(struct dma_device *ddev)
197{
198 return container_of(ddev, struct idma64, dma);
199}
200
201static inline u32 idma64_readl(struct idma64 *idma64, int offset)
202{
203 return readl(idma64->regs + offset);
204}
205
206static inline void idma64_writel(struct idma64 *idma64, int offset, u32 value)
207{
208 writel(value, idma64->regs + offset);
209}
210
211#define dma_readl(idma64, reg) \
212 idma64_readl(idma64, IDMA64_##reg)
213#define dma_writel(idma64, reg, value) \
214 idma64_writel(idma64, IDMA64_##reg, (value))
215
216/**
217 * struct idma64_chip - representation of iDMA 64-bit controller hardware
218 * @dev: struct device of the DMA controller
219 * @irq: irq line
220 * @regs: memory mapped I/O space
221 * @idma64: struct idma64 that is filed by idma64_probe()
222 */
223struct idma64_chip {
224 struct device *dev;
225 int irq;
226 void __iomem *regs;
227 struct idma64 *idma64;
228};
229
230#endif /* __DMA_IDMA64_H__ */