2 * intel_mid_dma_regs.h - Intel MID DMA Drivers
4 * Copyright (C) 2008-10 Intel Corp
5 * Author: Vinod Koul <vinod.koul@intel.com>
6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; version 2 of the License.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
21 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 #ifndef __INTEL_MID_DMAC_REGS_H__
26 #define __INTEL_MID_DMAC_REGS_H__
28 #include <linux/dmaengine.h>
29 #include <linux/dmapool.h>
30 #include <linux/pci_ids.h>
32 #define INTEL_MID_DMA_DRIVER_VERSION "1.1.0"
34 #define REG_BIT0 0x00000001
35 #define REG_BIT8 0x00000100
36 #define INT_MASK_WE 0x8
37 #define CLEAR_DONE 0xFFFFEFFF
38 #define UNMASK_INTR_REG(chan_num) \
39 ((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
40 #define MASK_INTR_REG(chan_num) (REG_BIT8 << chan_num)
42 #define ENABLE_CHANNEL(chan_num) \
43 ((REG_BIT0 << chan_num) | (REG_BIT8 << chan_num))
45 #define DISABLE_CHANNEL(chan_num) \
46 (REG_BIT8 << chan_num)
48 #define DESCS_PER_CHANNEL 16
50 /*registers associated with channel programming*/
51 #define DMA_REG_SIZE 0x400
52 #define DMA_CH_SIZE 0x58
54 /*CH X REG = (DMA_CH_SIZE)*CH_NO + REG*/
55 #define SAR 0x00 /* Source Address Register*/
56 #define DAR 0x08 /* Destination Address Register*/
57 #define LLP 0x10 /* Linked List Pointer Register*/
58 #define CTL_LOW 0x18 /* Control Register*/
59 #define CTL_HIGH 0x1C /* Control Register*/
60 #define CFG_LOW 0x40 /* Configuration Register Low*/
61 #define CFG_HIGH 0x44 /* Configuration Register high*/
63 #define STATUS_TFR 0x2E8
64 #define STATUS_BLOCK 0x2F0
65 #define STATUS_ERR 0x308
68 #define RAW_BLOCK 0x2C8
71 #define MASK_TFR 0x310
72 #define MASK_BLOCK 0x318
73 #define MASK_SRC_TRAN 0x320
74 #define MASK_DST_TRAN 0x328
75 #define MASK_ERR 0x330
77 #define CLEAR_TFR 0x338
78 #define CLEAR_BLOCK 0x340
79 #define CLEAR_SRC_TRAN 0x348
80 #define CLEAR_DST_TRAN 0x350
81 #define CLEAR_ERR 0x358
83 #define INTR_STATUS 0x360
85 #define DMA_CHAN_EN 0x3A0
87 /*DMA channel control registers*/
88 union intel_mid_dma_ctl_lo {
90 u32 int_en:1; /*enable or disable interrupts*/
92 u32 dst_tr_width:3; /*destination transfer width*/
93 /*usually 32 bits = 010*/
94 u32 src_tr_width:3; /*source transfer width*/
95 /*usually 32 bits = 010*/
96 u32 dinc:2; /*destination address inc/dec*/
97 /*For mem:INC=00, Periphral NoINC=11*/
98 u32 sinc:2; /*source address inc or dec, as above*/
99 u32 dst_msize:3; /*destination burst transaction length*/
100 /*always = 16 ie 011*/
101 u32 src_msize:3; /*source burst transaction length*/
102 /*always = 16 ie 011*/
104 u32 tt_fc:3; /*transfer type and flow controller*/
108 u32 dms:2; /*destination master select = 0*/
109 u32 sms:2; /*source master select = 0*/
110 u32 llp_dst_en:1; /*enable/disable destination LLP = 0*/
111 u32 llp_src_en:1; /*enable/disable source LLP = 0*/
117 union intel_mid_dma_ctl_hi {
119 u32 block_ts:12; /*block transfer size*/
120 u32 done:1; /*Done - updated by DMAC*/
121 u32 reser:19; /*configured by DMAC*/
127 /*DMA channel configuration registers*/
128 union intel_mid_dma_cfg_lo {
131 u32 ch_prior:3; /*channel priority = 0*/
132 u32 ch_susp:1; /*channel suspend = 0*/
133 u32 fifo_empty:1; /*FIFO empty or not R bit = 0*/
134 u32 hs_sel_dst:1; /*select HW/SW destn handshaking*/
136 u32 hs_sel_src:1; /*select HW/SW src handshaking*/
138 u32 dst_hs_pol:1; /*dest HS interface polarity*/
139 u32 src_hs_pol:1; /*src HS interface polarity*/
140 u32 max_abrst:10; /*max AMBA burst len = 0 (no sw limit*/
141 u32 reload_src:1; /*auto reload src addr =1 if src is P*/
142 u32 reload_dst:1; /*AR destn addr =1 if dstn is P*/
147 union intel_mid_dma_cfg_hi {
149 u32 fcmode:1; /*flow control mode = 1*/
150 u32 fifo_mode:1; /*FIFO mode select = 1*/
151 u32 protctl:3; /*protection control = 0*/
153 u32 src_per:4; /*src hw HS interface*/
154 u32 dst_per:4; /*dstn hw HS interface*/
162 * struct intel_mid_dma_chan - internal mid representation of a DMA channel
163 * @chan: dma_chan strcture represetation for mid chan
164 * @ch_regs: MMIO register space pointer to channel register
165 * @dma_base: MMIO register space DMA engine base pointer
166 * @ch_id: DMA channel id
167 * @lock: channel spinlock
168 * @active_list: current active descriptors
169 * @queue: current queued up descriptors
170 * @free_list: current free descriptors
171 * @slave: dma slave struture
172 * @descs_allocated: total number of decsiptors allocated
173 * @dma: dma device struture pointer
174 * @busy: bool representing if ch is busy (active txn) or not
175 * @in_use: bool representing if ch is in use or not
176 * @raw_tfr: raw trf interrupt received
177 * @raw_block: raw block interrupt received
179 struct intel_mid_dma_chan {
180 struct dma_chan chan;
181 void __iomem *ch_regs;
182 void __iomem *dma_base;
185 struct list_head active_list;
186 struct list_head queue;
187 struct list_head free_list;
188 unsigned int descs_allocated;
189 struct middma_device *dma;
194 struct intel_mid_dma_slave *mid_slave;
197 static inline struct intel_mid_dma_chan *to_intel_mid_dma_chan(
198 struct dma_chan *chan)
200 return container_of(chan, struct intel_mid_dma_chan, chan);
203 enum intel_mid_dma_state {
208 * struct middma_device - internal representation of a DMA device
210 * @dma_base: MMIO register space pointer of DMA
211 * @dma_pool: for allocating DMA descriptors
212 * @common: embedded struct dma_device
213 * @tasklet: dma tasklet for processing interrupts
214 * @ch: per channel data
215 * @pci_id: DMA device PCI ID
216 * @intr_mask: Interrupt mask to be used
217 * @mask_reg: MMIO register for periphral mask
218 * @chan_base: Base ch index (read from driver data)
219 * @max_chan: max number of chs supported (from drv_data)
220 * @block_size: Block size of DMA transfer supported (from drv_data)
221 * @pimr_mask: MMIO register addr for periphral interrupt (from drv_data)
222 * @state: dma PM device state
224 struct middma_device {
225 struct pci_dev *pdev;
226 void __iomem *dma_base;
227 struct pci_pool *dma_pool;
228 struct dma_device common;
229 struct tasklet_struct tasklet;
230 struct intel_mid_dma_chan ch[MAX_CHAN];
232 unsigned int intr_mask;
233 void __iomem *mask_reg;
237 unsigned int pimr_mask;
238 enum intel_mid_dma_state state;
241 static inline struct middma_device *to_middma_device(struct dma_device *common)
243 return container_of(common, struct middma_device, common);
246 struct intel_mid_dma_desc {
247 void __iomem *block; /*ch ptr*/
248 struct list_head desc_node;
249 struct dma_async_tx_descriptor txd;
257 struct pci_pool *lli_pool;
258 struct intel_mid_dma_lli *lli;
260 unsigned int lli_length;
261 unsigned int current_lli;
263 enum dma_transfer_direction dirn;
264 enum dma_status status;
265 enum dma_slave_buswidth width; /*width of DMA txn*/
266 enum intel_mid_dma_mode cfg_mode; /*mode configuration*/
270 struct intel_mid_dma_lli {
276 } __attribute__ ((packed));
278 static inline int test_ch_en(void __iomem *dma, u32 ch_no)
280 u32 en_reg = ioread32(dma + DMA_CHAN_EN);
281 return (en_reg >> ch_no) & 0x1;
284 static inline struct intel_mid_dma_desc *to_intel_mid_dma_desc
285 (struct dma_async_tx_descriptor *txd)
287 return container_of(txd, struct intel_mid_dma_desc, txd);
290 static inline struct intel_mid_dma_slave *to_intel_mid_dma_slave
291 (struct dma_slave_config *slave)
293 return container_of(slave, struct intel_mid_dma_slave, dma_slave);
297 int dma_resume(struct device *dev);
299 #endif /*__INTEL_MID_DMAC_REGS_H__*/