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authorBen Dooks <ben@simtec.co.uk>2009-03-10 19:57:26 -0400
committerBen Dooks <ben-linux@fluff.org>2009-05-18 11:29:21 -0400
commitfa7a7883fe5c647decee57a9c1b86a96408c5b26 (patch)
tree0525cb20ab7800edb2dc404fe4cd6b0364de34f1 /arch/arm
parent97c1b145231730e62dd71921ec653315a1da3aad (diff)
[ARM] S3C64XX: DMA support
Add support for the DMA blocks in the S3C64XX series of CPUS, which are based on the ARM PL080 PrimeCell system. Unfortunately, these DMA controllers diverge from the PL080 design by adding another DMA controller register and configuration for OneNAND. Signed-off-by: Ben Dooks <ben@simtec.co.uk> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/include/asm/hardware/pl080.h138
-rw-r--r--arch/arm/mach-s3c6400/include/mach/dma.h59
-rw-r--r--arch/arm/plat-s3c64xx/Kconfig4
-rw-r--r--arch/arm/plat-s3c64xx/Makefile4
-rw-r--r--arch/arm/plat-s3c64xx/dma.c722
-rw-r--r--arch/arm/plat-s3c64xx/include/plat/dma-plat.h70
6 files changed, 996 insertions, 1 deletions
diff --git a/arch/arm/include/asm/hardware/pl080.h b/arch/arm/include/asm/hardware/pl080.h
new file mode 100644
index 000000000000..6a6c66be7f65
--- /dev/null
+++ b/arch/arm/include/asm/hardware/pl080.h
@@ -0,0 +1,138 @@
1/* arch/arm/include/asm/hardware/pl080.h
2 *
3 * Copyright 2008 Openmoko, Inc.
4 * Copyright 2008 Simtec Electronics
5 * http://armlinux.simtec.co.uk/
6 * Ben Dooks <ben@simtec.co.uk>
7 *
8 * ARM PrimeCell PL080 DMA controller
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13*/
14
15/* Note, there are some Samsung updates to this controller block which
16 * make it not entierly compatible with the PL080 specification from
17 * ARM. When in doubt, check the Samsung documentation first.
18 *
19 * The Samsung defines are PL080S, and add an extra controll register,
20 * the ability to move more than 2^11 counts of data and some extra
21 * OneNAND features.
22*/
23
24#define PL080_INT_STATUS (0x00)
25#define PL080_TC_STATUS (0x04)
26#define PL080_TC_CLEAR (0x08)
27#define PL080_ERR_STATUS (0x0C)
28#define PL080_ERR_CLEAR (0x10)
29#define PL080_RAW_TC_STATUS (0x14)
30#define PL080_RAW_ERR_STATUS (0x18)
31#define PL080_EN_CHAN (0x1c)
32#define PL080_SOFT_BREQ (0x20)
33#define PL080_SOFT_SREQ (0x24)
34#define PL080_SOFT_LBREQ (0x28)
35#define PL080_SOFT_LSREQ (0x2C)
36
37#define PL080_CONFIG (0x30)
38#define PL080_CONFIG_M2_BE (1 << 2)
39#define PL080_CONFIG_M1_BE (1 << 1)
40#define PL080_CONFIG_ENABLE (1 << 0)
41
42#define PL080_SYNC (0x34)
43
44/* Per channel configuration registers */
45
46#define PL008_Cx_STRIDE (0x20)
47#define PL080_Cx_BASE(x) ((0x100 + (x * 0x20)))
48#define PL080_Cx_SRC_ADDR(x) ((0x100 + (x * 0x20)))
49#define PL080_Cx_DST_ADDR(x) ((0x104 + (x * 0x20)))
50#define PL080_Cx_LLI(x) ((0x108 + (x * 0x20)))
51#define PL080_Cx_CONTROL(x) ((0x10C + (x * 0x20)))
52#define PL080_Cx_CONFIG(x) ((0x110 + (x * 0x20)))
53#define PL080S_Cx_CONTROL2(x) ((0x110 + (x * 0x20)))
54#define PL080S_Cx_CONFIG(x) ((0x114 + (x * 0x20)))
55
56#define PL080_CH_SRC_ADDR (0x00)
57#define PL080_CH_DST_ADDR (0x04)
58#define PL080_CH_LLI (0x08)
59#define PL080_CH_CONTROL (0x0C)
60#define PL080_CH_CONFIG (0x10)
61#define PL080S_CH_CONTROL2 (0x10)
62#define PL080S_CH_CONFIG (0x14)
63
64#define PL080_LLI_ADDR_MASK (0x3fffffff << 2)
65#define PL080_LLI_ADDR_SHIFT (2)
66#define PL080_LLI_LM_AHB2 (1 << 0)
67
68#define PL080_CONTROL_TC_IRQ_EN (1 << 31)
69#define PL080_CONTROL_PROT_MASK (0x7 << 28)
70#define PL080_CONTROL_PROT_SHIFT (28)
71#define PL080_CONTROL_PROT_SYS (1 << 28)
72#define PL080_CONTROL_DST_INCR (1 << 27)
73#define PL080_CONTROL_SRC_INCR (1 << 26)
74#define PL080_CONTROL_DST_AHB2 (1 << 25)
75#define PL080_CONTROL_SRC_AHB2 (1 << 24)
76#define PL080_CONTROL_DWIDTH_MASK (0x7 << 21)
77#define PL080_CONTROL_DWIDTH_SHIFT (21)
78#define PL080_CONTROL_SWIDTH_MASK (0x7 << 18)
79#define PL080_CONTROL_SWIDTH_SHIFT (18)
80#define PL080_CONTROL_DB_SIZE_MASK (0x7 << 15)
81#define PL080_CONTROL_DB_SIZE_SHIFT (15)
82#define PL080_CONTROL_SB_SIZE_MASK (0x7 << 12)
83#define PL080_CONTROL_SB_SIZE_SHIFT (12)
84#define PL080_CONTROL_TRANSFER_SIZE_MASK (0xfff << 0)
85#define PL080_CONTROL_TRANSFER_SIZE_SHIFT (0)
86
87#define PL080_BSIZE_1 (0x0)
88#define PL080_BSIZE_4 (0x1)
89#define PL080_BSIZE_8 (0x2)
90#define PL080_BSIZE_16 (0x3)
91#define PL080_BSIZE_32 (0x4)
92#define PL080_BSIZE_64 (0x5)
93#define PL080_BSIZE_128 (0x6)
94#define PL080_BSIZE_256 (0x7)
95
96#define PL080_WIDTH_8BIT (0x0)
97#define PL080_WIDTH_16BIT (0x1)
98#define PL080_WIDTH_32BIT (0x2)
99
100#define PL080_CONFIG_HALT (1 << 18)
101#define PL080_CONFIG_ACTIVE (1 << 17) /* RO */
102#define PL080_CONFIG_LOCK (1 << 16)
103#define PL080_CONFIG_TC_IRQ_MASK (1 << 15)
104#define PL080_CONFIG_ERR_IRQ_MASK (1 << 14)
105#define PL080_CONFIG_FLOW_CONTROL_MASK (0x7 << 11)
106#define PL080_CONFIG_FLOW_CONTROL_SHIFT (11)
107#define PL080_CONFIG_DST_SEL_MASK (0xf << 6)
108#define PL080_CONFIG_DST_SEL_SHIFT (6)
109#define PL080_CONFIG_SRC_SEL_MASK (0xf << 1)
110#define PL080_CONFIG_SRC_SEL_SHIFT (1)
111#define PL080_CONFIG_ENABLE (1 << 0)
112
113#define PL080_FLOW_MEM2MEM (0x0)
114#define PL080_FLOW_MEM2PER (0x1)
115#define PL080_FLOW_PER2MEM (0x2)
116#define PL080_FLOW_SRC2DST (0x3)
117#define PL080_FLOW_SRC2DST_DST (0x4)
118#define PL080_FLOW_MEM2PER_PER (0x5)
119#define PL080_FLOW_PER2MEM_PER (0x6)
120#define PL080_FLOW_SRC2DST_SRC (0x7)
121
122/* DMA linked list chain structure */
123
124struct pl080_lli {
125 u32 src_addr;
126 u32 dst_addr;
127 u32 next_lli;
128 u32 control0;
129};
130
131struct pl080s_lli {
132 u32 src_addr;
133 u32 dst_addr;
134 u32 next_lli;
135 u32 control0;
136 u32 control1;
137};
138
diff --git a/arch/arm/mach-s3c6400/include/mach/dma.h b/arch/arm/mach-s3c6400/include/mach/dma.h
index 9771ac2cb07e..1067619f0ba0 100644
--- a/arch/arm/mach-s3c6400/include/mach/dma.h
+++ b/arch/arm/mach-s3c6400/include/mach/dma.h
@@ -11,6 +11,63 @@
11#ifndef __ASM_ARCH_DMA_H 11#ifndef __ASM_ARCH_DMA_H
12#define __ASM_ARCH_DMA_H __FILE__ 12#define __ASM_ARCH_DMA_H __FILE__
13 13
14/* currently nothing here, placeholder */ 14#define S3C_DMA_CHANNELS (16)
15
16/* see mach-s3c2410/dma.h for notes on dma channel numbers */
17
18/* Note, for the S3C64XX architecture we keep the DMACH_
19 * defines in the order they are allocated to [S]DMA0/[S]DMA1
20 * so that is easy to do DHACH_ -> DMA controller conversion
21 */
22enum dma_ch {
23 /* DMA0/SDMA0 */
24 DMACH_UART0 = 0,
25 DMACH_UART0_SRC2,
26 DMACH_UART1,
27 DMACH_UART1_SRC2,
28 DMACH_UART2,
29 DMACH_UART2_SRC2,
30 DMACH_UART3,
31 DMACH_UART3_SRC2,
32 DMACH_PCM0_TX,
33 DMACH_PCM0_RX,
34 DMACH_I2S0_OUT,
35 DMACH_I2S0_IN,
36 DMACH_SPI0_TX,
37 DMACH_SPI0_RX,
38 DMACH_HSI_I2SV40_TX,
39 DMACH_HSI_I2SV40_RX,
40
41 /* DMA1/SDMA1 */
42 DMACH_PCM1_TX = 16,
43 DMACH_PCM1_RX,
44 DMACH_I2S1_OUT,
45 DMACH_I2S1_IN,
46 DMACH_SPI1_TX,
47 DMACH_SPI1_RX,
48 DMACH_AC97_PCMOUT,
49 DMACH_AC97_PCMIN,
50 DMACH_AC97_MICIN,
51 DMACH_PWM,
52 DMACH_IRDA,
53 DMACH_EXTERNAL,
54 DMACH_RES1,
55 DMACH_RES2,
56 DMACH_SECURITY_RX, /* SDMA1 only */
57 DMACH_SECURITY_TX, /* SDMA1 only */
58 DMACH_MAX /* the end */
59};
60
61static __inline__ int s3c_dma_has_circular(void)
62{
63 /* we will be supporting ciruclar buffers as soon as we have DMA
64 * engine support.
65 */
66 return 1;
67}
68
69#define S3C2410_DMAF_CIRCULAR (1 << 0)
70
71#include <plat/dma.h>
15 72
16#endif /* __ASM_ARCH_IRQ_H */ 73#endif /* __ASM_ARCH_IRQ_H */
diff --git a/arch/arm/plat-s3c64xx/Kconfig b/arch/arm/plat-s3c64xx/Kconfig
index 54375a00a7d2..9ce66151fd95 100644
--- a/arch/arm/plat-s3c64xx/Kconfig
+++ b/arch/arm/plat-s3c64xx/Kconfig
@@ -38,6 +38,10 @@ config CPU_S3C6400_CLOCK
38 Common clock support code for the S3C6400 that is shared 38 Common clock support code for the S3C6400 that is shared
39 by other CPUs in the series, such as the S3C6410. 39 by other CPUs in the series, such as the S3C6410.
40 40
41config S3C64XX_DMA
42 bool "S3C64XX DMA"
43 select S3C_DMA
44
41# platform specific device setup 45# platform specific device setup
42 46
43config S3C64XX_SETUP_I2C0 47config S3C64XX_SETUP_I2C0
diff --git a/arch/arm/plat-s3c64xx/Makefile b/arch/arm/plat-s3c64xx/Makefile
index 2e6d79bf8f33..61bdb67e2f6d 100644
--- a/arch/arm/plat-s3c64xx/Makefile
+++ b/arch/arm/plat-s3c64xx/Makefile
@@ -24,6 +24,10 @@ obj-y += gpiolib.o
24obj-$(CONFIG_CPU_S3C6400_INIT) += s3c6400-init.o 24obj-$(CONFIG_CPU_S3C6400_INIT) += s3c6400-init.o
25obj-$(CONFIG_CPU_S3C6400_CLOCK) += s3c6400-clock.o 25obj-$(CONFIG_CPU_S3C6400_CLOCK) += s3c6400-clock.o
26 26
27# DMA support
28
29obj-$(CONFIG_S3C64XX_DMA) += dma.o
30
27# Device setup 31# Device setup
28 32
29obj-$(CONFIG_S3C64XX_SETUP_I2C0) += setup-i2c0.o 33obj-$(CONFIG_S3C64XX_SETUP_I2C0) += setup-i2c0.o
diff --git a/arch/arm/plat-s3c64xx/dma.c b/arch/arm/plat-s3c64xx/dma.c
new file mode 100644
index 000000000000..1c0f51cbcd89
--- /dev/null
+++ b/arch/arm/plat-s3c64xx/dma.c
@@ -0,0 +1,722 @@
1/* linux/arch/arm/plat-s3c64xx/dma.c
2 *
3 * Copyright 2009 Openmoko, Inc.
4 * Copyright 2009 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
7 *
8 * S3C64XX DMA core
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13*/
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/interrupt.h>
18#include <linux/dmapool.h>
19#include <linux/sysdev.h>
20#include <linux/errno.h>
21#include <linux/delay.h>
22#include <linux/clk.h>
23#include <linux/err.h>
24#include <linux/io.h>
25
26#include <mach/dma.h>
27#include <mach/map.h>
28#include <mach/irqs.h>
29
30#include <plat/dma-plat.h>
31#include <plat/regs-sys.h>
32
33#include <asm/hardware/pl080.h>
34
35/* dma channel state information */
36
37struct s3c64xx_dmac {
38 struct sys_device sysdev;
39 struct clk *clk;
40 void __iomem *regs;
41 struct s3c2410_dma_chan *channels;
42 enum dma_ch chanbase;
43};
44
45/* pool to provide LLI buffers */
46static struct dma_pool *dma_pool;
47
48/* Debug configuration and code */
49
50static unsigned char debug_show_buffs = 0;
51
52static void dbg_showchan(struct s3c2410_dma_chan *chan)
53{
54 pr_debug("DMA%d: %08x->%08x L %08x C %08x,%08x S %08x\n",
55 chan->number,
56 readl(chan->regs + PL080_CH_SRC_ADDR),
57 readl(chan->regs + PL080_CH_DST_ADDR),
58 readl(chan->regs + PL080_CH_LLI),
59 readl(chan->regs + PL080_CH_CONTROL),
60 readl(chan->regs + PL080S_CH_CONTROL2),
61 readl(chan->regs + PL080S_CH_CONFIG));
62}
63
64static void show_lli(struct pl080s_lli *lli)
65{
66 pr_debug("LLI[%p] %08x->%08x, NL %08x C %08x,%08x\n",
67 lli, lli->src_addr, lli->dst_addr, lli->next_lli,
68 lli->control0, lli->control1);
69}
70
71static void dbg_showbuffs(struct s3c2410_dma_chan *chan)
72{
73 struct s3c64xx_dma_buff *ptr;
74 struct s3c64xx_dma_buff *end;
75
76 pr_debug("DMA%d: buffs next %p, curr %p, end %p\n",
77 chan->number, chan->next, chan->curr, chan->end);
78
79 ptr = chan->next;
80 end = chan->end;
81
82 if (debug_show_buffs) {
83 for (; ptr != NULL; ptr = ptr->next) {
84 pr_debug("DMA%d: %08x ",
85 chan->number, ptr->lli_dma);
86 show_lli(ptr->lli);
87 }
88 }
89}
90
91/* End of Debug */
92
93static struct s3c2410_dma_chan *s3c64xx_dma_map_channel(unsigned int channel)
94{
95 struct s3c2410_dma_chan *chan;
96 unsigned int start, offs;
97
98 start = 0;
99
100 if (channel >= DMACH_PCM1_TX)
101 start = 8;
102
103 for (offs = 0; offs < 8; offs++) {
104 chan = &s3c2410_chans[start + offs];
105 if (!chan->in_use)
106 goto found;
107 }
108
109 return NULL;
110
111found:
112 s3c_dma_chan_map[channel] = chan;
113 return chan;
114}
115
116int s3c2410_dma_config(unsigned int channel, int xferunit)
117{
118 struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
119
120 if (chan == NULL)
121 return -EINVAL;
122
123 switch (xferunit) {
124 case 1:
125 chan->hw_width = 0;
126 break;
127 case 2:
128 chan->hw_width = 1;
129 break;
130 case 4:
131 chan->hw_width = 2;
132 break;
133 default:
134 printk(KERN_ERR "%s: illegal width %d\n", __func__, xferunit);
135 return -EINVAL;
136 }
137
138 return 0;
139}
140EXPORT_SYMBOL(s3c2410_dma_config);
141
142static void s3c64xx_dma_fill_lli(struct s3c2410_dma_chan *chan,
143 struct pl080s_lli *lli,
144 dma_addr_t data, int size)
145{
146 dma_addr_t src, dst;
147 u32 control0, control1;
148
149 switch (chan->source) {
150 case S3C2410_DMASRC_HW:
151 src = chan->dev_addr;
152 dst = data;
153 control0 = PL080_CONTROL_SRC_AHB2;
154 control0 |= (u32)chan->hw_width << PL080_CONTROL_SWIDTH_SHIFT;
155 control0 |= 2 << PL080_CONTROL_DWIDTH_SHIFT;
156 control0 |= PL080_CONTROL_DST_INCR;
157 break;
158
159 case S3C2410_DMASRC_MEM:
160 src = data;
161 dst = chan->dev_addr;
162 control0 = PL080_CONTROL_DST_AHB2;
163 control0 |= (u32)chan->hw_width << PL080_CONTROL_DWIDTH_SHIFT;
164 control0 |= 2 << PL080_CONTROL_SWIDTH_SHIFT;
165 control0 |= PL080_CONTROL_SRC_INCR;
166 break;
167 default:
168 BUG();
169 }
170
171 /* note, we do not currently setup any of the burst controls */
172
173 control1 = size >> chan->hw_width; /* size in no of xfers */
174 control0 |= PL080_CONTROL_PROT_SYS; /* always in priv. mode */
175 control0 |= PL080_CONTROL_TC_IRQ_EN; /* always fire IRQ */
176
177 lli->src_addr = src;
178 lli->dst_addr = dst;
179 lli->next_lli = 0;
180 lli->control0 = control0;
181 lli->control1 = control1;
182}
183
184static void s3c64xx_lli_to_regs(struct s3c2410_dma_chan *chan,
185 struct pl080s_lli *lli)
186{
187 void __iomem *regs = chan->regs;
188
189 pr_debug("%s: LLI %p => regs\n", __func__, lli);
190 show_lli(lli);
191
192 writel(lli->src_addr, regs + PL080_CH_SRC_ADDR);
193 writel(lli->dst_addr, regs + PL080_CH_DST_ADDR);
194 writel(lli->next_lli, regs + PL080_CH_LLI);
195 writel(lli->control0, regs + PL080_CH_CONTROL);
196 writel(lli->control1, regs + PL080S_CH_CONTROL2);
197}
198
199static int s3c64xx_dma_start(struct s3c2410_dma_chan *chan)
200{
201 struct s3c64xx_dmac *dmac = chan->dmac;
202 u32 config;
203 u32 bit = chan->bit;
204
205 dbg_showchan(chan);
206
207 pr_debug("%s: clearing interrupts\n", __func__);
208
209 /* clear interrupts */
210 writel(bit, dmac->regs + PL080_TC_CLEAR);
211 writel(bit, dmac->regs + PL080_ERR_CLEAR);
212
213 pr_debug("%s: starting channel\n", __func__);
214
215 config = readl(chan->regs + PL080S_CH_CONFIG);
216 config |= PL080_CONFIG_ENABLE;
217
218 pr_debug("%s: writing config %08x\n", __func__, config);
219 writel(config, chan->regs + PL080S_CH_CONFIG);
220
221 return 0;
222}
223
224static int s3c64xx_dma_stop(struct s3c2410_dma_chan *chan)
225{
226 u32 config;
227 int timeout;
228
229 pr_debug("%s: stopping channel\n", __func__);
230
231 dbg_showchan(chan);
232
233 config = readl(chan->regs + PL080S_CH_CONFIG);
234 config |= PL080_CONFIG_HALT;
235 writel(config, chan->regs + PL080S_CH_CONFIG);
236
237 timeout = 1000;
238 do {
239 config = readl(chan->regs + PL080S_CH_CONFIG);
240 pr_debug("%s: %d - config %08x\n", __func__, timeout, config);
241 if (config & PL080_CONFIG_ACTIVE)
242 udelay(10);
243 else
244 break;
245 } while (--timeout > 0);
246
247 if (config & PL080_CONFIG_ACTIVE) {
248 printk(KERN_ERR "%s: channel still active\n", __func__);
249 return -EFAULT;
250 }
251
252 config = readl(chan->regs + PL080S_CH_CONFIG);
253 config &= ~PL080_CONFIG_ENABLE;
254 writel(config, chan->regs + PL080S_CH_CONFIG);
255
256 return 0;
257}
258
259static inline void s3c64xx_dma_bufffdone(struct s3c2410_dma_chan *chan,
260 struct s3c64xx_dma_buff *buf,
261 enum s3c2410_dma_buffresult result)
262{
263 if (chan->callback_fn != NULL)
264 (chan->callback_fn)(chan, buf->pw, 0, result);
265}
266
267static void s3c64xx_dma_freebuff(struct s3c64xx_dma_buff *buff)
268{
269 dma_pool_free(dma_pool, buff->lli, buff->lli_dma);
270 kfree(buff);
271}
272
273static int s3c64xx_dma_flush(struct s3c2410_dma_chan *chan)
274{
275 struct s3c64xx_dma_buff *buff, *next;
276 u32 config;
277
278 dbg_showchan(chan);
279
280 pr_debug("%s: flushing channel\n", __func__);
281
282 config = readl(chan->regs + PL080S_CH_CONFIG);
283 config &= ~PL080_CONFIG_ENABLE;
284 writel(config, chan->regs + PL080S_CH_CONFIG);
285
286 /* dump all the buffers associated with this channel */
287
288 for (buff = chan->curr; buff != NULL; buff = next) {
289 next = buff->next;
290 pr_debug("%s: buff %p (next %p)\n", __func__, buff, buff->next);
291
292 s3c64xx_dma_bufffdone(chan, buff, S3C2410_RES_ABORT);
293 s3c64xx_dma_freebuff(buff);
294 }
295
296 chan->curr = chan->next = chan->end = NULL;
297
298 return 0;
299}
300
301int s3c2410_dma_ctrl(unsigned int channel, enum s3c2410_chan_op op)
302{
303 struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
304
305 WARN_ON(!chan);
306 if (!chan)
307 return -EINVAL;
308
309 switch (op) {
310 case S3C2410_DMAOP_START:
311 return s3c64xx_dma_start(chan);
312
313 case S3C2410_DMAOP_STOP:
314 return s3c64xx_dma_stop(chan);
315
316 case S3C2410_DMAOP_FLUSH:
317 return s3c64xx_dma_flush(chan);
318
319 /* belive PAUSE/RESUME are no-ops */
320 case S3C2410_DMAOP_PAUSE:
321 case S3C2410_DMAOP_RESUME:
322 case S3C2410_DMAOP_STARTED:
323 case S3C2410_DMAOP_TIMEOUT:
324 return 0;
325 }
326
327 return -ENOENT;
328}
329EXPORT_SYMBOL(s3c2410_dma_ctrl);
330
331/* s3c2410_dma_enque
332 *
333 */
334
335int s3c2410_dma_enqueue(unsigned int channel, void *id,
336 dma_addr_t data, int size)
337{
338 struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
339 struct s3c64xx_dma_buff *next;
340 struct s3c64xx_dma_buff *buff;
341 struct pl080s_lli *lli;
342 int ret;
343
344 WARN_ON(!chan);
345 if (!chan)
346 return -EINVAL;
347
348 buff = kzalloc(sizeof(struct s3c64xx_dma_buff), GFP_KERNEL);
349 if (!buff) {
350 printk(KERN_ERR "%s: no memory for buffer\n", __func__);
351 return -ENOMEM;
352 }
353
354 lli = dma_pool_alloc(dma_pool, GFP_KERNEL, &buff->lli_dma);
355 if (!lli) {
356 printk(KERN_ERR "%s: no memory for lli\n", __func__);
357 ret = -ENOMEM;
358 goto err_buff;
359 }
360
361 pr_debug("%s: buff %p, dp %08x lli (%p, %08x) %d\n",
362 __func__, buff, data, lli, (u32)buff->lli_dma, size);
363
364 buff->lli = lli;
365 buff->pw = id;
366
367 s3c64xx_dma_fill_lli(chan, lli, data, size);
368
369 if ((next = chan->next) != NULL) {
370 struct s3c64xx_dma_buff *end = chan->end;
371 struct pl080s_lli *endlli = end->lli;
372
373 pr_debug("enquing onto channel\n");
374
375 end->next = buff;
376 endlli->next_lli = buff->lli_dma;
377
378 if (chan->flags & S3C2410_DMAF_CIRCULAR) {
379 struct s3c64xx_dma_buff *curr = chan->curr;
380 lli->next_lli = curr->lli_dma;
381 }
382
383 if (next == chan->curr) {
384 writel(buff->lli_dma, chan->regs + PL080_CH_LLI);
385 chan->next = buff;
386 }
387
388 show_lli(endlli);
389 chan->end = buff;
390 } else {
391 pr_debug("enquing onto empty channel\n");
392
393 chan->curr = buff;
394 chan->next = buff;
395 chan->end = buff;
396
397 s3c64xx_lli_to_regs(chan, lli);
398 }
399
400 show_lli(lli);
401
402 dbg_showchan(chan);
403 dbg_showbuffs(chan);
404 return 0;
405
406err_buff:
407 kfree(buff);
408 return ret;
409}
410
411EXPORT_SYMBOL(s3c2410_dma_enqueue);
412
413
414int s3c2410_dma_devconfig(int channel,
415 enum s3c2410_dmasrc source,
416 unsigned long devaddr)
417{
418 struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
419 u32 peripheral;
420 u32 config = 0;
421
422 printk("%s: channel %d, source %d, dev %08lx, chan %p\n",
423 __func__, channel, source, devaddr, chan);
424
425 WARN_ON(!chan);
426 if (!chan)
427 return -EINVAL;
428
429 peripheral = (chan->peripheral & 0xf);
430 chan->source = source;
431 chan->dev_addr = devaddr;
432
433 pr_debug("%s: peripheral %d\n", __func__, peripheral);
434
435 switch (source) {
436 case S3C2410_DMASRC_HW:
437 config = 2 << PL080_CONFIG_FLOW_CONTROL_SHIFT;
438 config |= peripheral << PL080_CONFIG_SRC_SEL_SHIFT;
439 break;
440 case S3C2410_DMASRC_MEM:
441 config = 1 << PL080_CONFIG_FLOW_CONTROL_SHIFT;
442 config |= peripheral << PL080_CONFIG_DST_SEL_SHIFT;
443 break;
444 default:
445 printk(KERN_ERR "%s: bad source\n", __func__);
446 return -EINVAL;
447 }
448
449 /* allow TC and ERR interrupts */
450 config |= PL080_CONFIG_TC_IRQ_MASK;
451 config |= PL080_CONFIG_ERR_IRQ_MASK;
452
453 pr_debug("%s: config %08x\n", __func__, config);
454
455 writel(config, chan->regs + PL080S_CH_CONFIG);
456
457 return 0;
458}
459EXPORT_SYMBOL(s3c2410_dma_devconfig);
460
461
462int s3c2410_dma_getposition(unsigned int channel,
463 dma_addr_t *src, dma_addr_t *dst)
464{
465 struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
466
467 WARN_ON(!chan);
468 if (!chan)
469 return -EINVAL;
470
471 if (src != NULL)
472 *src = readl(chan->regs + PL080_CH_SRC_ADDR);
473
474 if (dst != NULL)
475 *dst = readl(chan->regs + PL080_CH_DST_ADDR);
476
477 return 0;
478}
479EXPORT_SYMBOL(s3c2410_dma_getposition);
480
481/* s3c2410_request_dma
482 *
483 * get control of an dma channel
484*/
485
486int s3c2410_dma_request(unsigned int channel,
487 struct s3c2410_dma_client *client,
488 void *dev)
489{
490 struct s3c2410_dma_chan *chan;
491 unsigned long flags;
492
493 pr_debug("dma%d: s3c2410_request_dma: client=%s, dev=%p\n",
494 channel, client->name, dev);
495
496 local_irq_save(flags);
497
498 chan = s3c64xx_dma_map_channel(channel);
499 if (chan == NULL) {
500 local_irq_restore(flags);
501 return -EBUSY;
502 }
503
504 dbg_showchan(chan);
505
506 chan->client = client;
507 chan->in_use = 1;
508 chan->peripheral = channel;
509
510 local_irq_restore(flags);
511
512 /* need to setup */
513
514 pr_debug("%s: channel initialised, %p\n", __func__, chan);
515
516 return chan->number | DMACH_LOW_LEVEL;
517}
518
519EXPORT_SYMBOL(s3c2410_dma_request);
520
521/* s3c2410_dma_free
522 *
523 * release the given channel back to the system, will stop and flush
524 * any outstanding transfers, and ensure the channel is ready for the
525 * next claimant.
526 *
527 * Note, although a warning is currently printed if the freeing client
528 * info is not the same as the registrant's client info, the free is still
529 * allowed to go through.
530*/
531
532int s3c2410_dma_free(unsigned int channel, struct s3c2410_dma_client *client)
533{
534 struct s3c2410_dma_chan *chan = s3c_dma_lookup_channel(channel);
535 unsigned long flags;
536
537 if (chan == NULL)
538 return -EINVAL;
539
540 local_irq_save(flags);
541
542 if (chan->client != client) {
543 printk(KERN_WARNING "dma%d: possible free from different client (channel %p, passed %p)\n",
544 channel, chan->client, client);
545 }
546
547 /* sort out stopping and freeing the channel */
548
549
550 chan->client = NULL;
551 chan->in_use = 0;
552
553 if (!(channel & DMACH_LOW_LEVEL))
554 s3c_dma_chan_map[channel] = NULL;
555
556 local_irq_restore(flags);
557
558 return 0;
559}
560
561EXPORT_SYMBOL(s3c2410_dma_free);
562
563
564static void s3c64xx_dma_tcirq(struct s3c64xx_dmac *dmac, int offs)
565{
566 struct s3c2410_dma_chan *chan = dmac->channels + offs;
567
568 /* note, we currently do not bother to work out which buffer
569 * or buffers have been completed since the last tc-irq. */
570
571 if (chan->callback_fn)
572 (chan->callback_fn)(chan, chan->curr->pw, 0, S3C2410_RES_OK);
573}
574
575static void s3c64xx_dma_errirq(struct s3c64xx_dmac *dmac, int offs)
576{
577 printk(KERN_DEBUG "%s: offs %d\n", __func__, offs);
578}
579
580static irqreturn_t s3c64xx_dma_irq(int irq, void *pw)
581{
582 struct s3c64xx_dmac *dmac = pw;
583 u32 tcstat, errstat;
584 u32 bit;
585 int offs;
586
587 tcstat = readl(dmac->regs + PL080_TC_STATUS);
588 errstat = readl(dmac->regs + PL080_ERR_STATUS);
589
590 for (offs = 0, bit = 1; offs < 8; offs++, bit <<= 1) {
591 if (tcstat & bit) {
592 writel(bit, dmac->regs + PL080_TC_CLEAR);
593 s3c64xx_dma_tcirq(dmac, offs);
594 }
595
596 if (errstat & bit) {
597 s3c64xx_dma_errirq(dmac, offs);
598 writel(bit, dmac->regs + PL080_ERR_CLEAR);
599 }
600 }
601
602 return IRQ_HANDLED;
603}
604
605static struct sysdev_class dma_sysclass = {
606 .name = "s3c64xx-dma",
607};
608
609static int s3c64xx_dma_init1(int chno, enum dma_ch chbase,
610 int irq, unsigned int base)
611{
612 struct s3c2410_dma_chan *chptr = &s3c2410_chans[chno];
613 struct s3c64xx_dmac *dmac;
614 char clkname[16];
615 void __iomem *regs;
616 void __iomem *regptr;
617 int err, ch;
618
619 dmac = kzalloc(sizeof(struct s3c64xx_dmac), GFP_KERNEL);
620 if (!dmac) {
621 printk(KERN_ERR "%s: failed to alloc mem\n", __func__);
622 return -ENOMEM;
623 }
624
625 dmac->sysdev.id = chno / 8;
626 dmac->sysdev.cls = &dma_sysclass;
627
628 err = sysdev_register(&dmac->sysdev);
629 if (err) {
630 printk(KERN_ERR "%s: failed to register sysdevice\n", __func__);
631 goto err_alloc;
632 }
633
634 regs = ioremap(base, 0x200);
635 if (!regs) {
636 printk(KERN_ERR "%s: failed to ioremap()\n", __func__);
637 err = -ENXIO;
638 goto err_dev;
639 }
640
641 snprintf(clkname, sizeof(clkname), "dma%d", dmac->sysdev.id);
642
643 dmac->clk = clk_get(NULL, clkname);
644 if (IS_ERR(dmac->clk)) {
645 printk(KERN_ERR "%s: failed to get clock %s\n", __func__, clkname);
646 err = PTR_ERR(dmac->clk);
647 goto err_map;
648 }
649
650 clk_enable(dmac->clk);
651
652 dmac->regs = regs;
653 dmac->chanbase = chbase;
654 dmac->channels = chptr;
655
656 err = request_irq(irq, s3c64xx_dma_irq, 0, "DMA", dmac);
657 if (err < 0) {
658 printk(KERN_ERR "%s: failed to get irq\n", __func__);
659 goto err_clk;
660 }
661
662 regptr = regs + PL080_Cx_BASE(0);
663
664 for (ch = 0; ch < 8; ch++, chno++, chptr++) {
665 printk(KERN_INFO "%s: registering DMA %d (%p)\n",
666 __func__, chno, regptr);
667
668 chptr->bit = 1 << ch;
669 chptr->number = chno;
670 chptr->dmac = dmac;
671 chptr->regs = regptr;
672 regptr += PL008_Cx_STRIDE;
673 }
674
675 /* for the moment, permanently enable the controller */
676 writel(PL080_CONFIG_ENABLE, regs + PL080_CONFIG);
677
678 printk(KERN_INFO "PL080: IRQ %d, at %p\n", irq, regs);
679
680 return 0;
681
682err_clk:
683 clk_disable(dmac->clk);
684 clk_put(dmac->clk);
685err_map:
686 iounmap(regs);
687err_dev:
688 sysdev_unregister(&dmac->sysdev);
689err_alloc:
690 kfree(dmac);
691 return err;
692}
693
694static int __init s3c64xx_dma_init(void)
695{
696 int ret;
697
698 printk(KERN_INFO "%s: Registering DMA channels\n", __func__);
699
700 dma_pool = dma_pool_create("DMA-LLI", NULL, 32, 16, 0);
701 if (!dma_pool) {
702 printk(KERN_ERR "%s: failed to create pool\n", __func__);
703 return -ENOMEM;
704 }
705
706 ret = sysdev_class_register(&dma_sysclass);
707 if (ret) {
708 printk(KERN_ERR "%s: failed to create sysclass\n", __func__);
709 return -ENOMEM;
710 }
711
712 /* Set all DMA configuration to be DMA, not SDMA */
713 writel(0xffffff, S3C_SYSREG(0x110));
714
715 /* Register standard DMA controlers */
716 s3c64xx_dma_init1(0, DMACH_UART0, IRQ_DMA0, 0x75000000);
717 s3c64xx_dma_init1(8, DMACH_PCM1_TX, IRQ_DMA1, 0x75100000);
718
719 return 0;
720}
721
722arch_initcall(s3c64xx_dma_init);
diff --git a/arch/arm/plat-s3c64xx/include/plat/dma-plat.h b/arch/arm/plat-s3c64xx/include/plat/dma-plat.h
new file mode 100644
index 000000000000..0c30dd986725
--- /dev/null
+++ b/arch/arm/plat-s3c64xx/include/plat/dma-plat.h
@@ -0,0 +1,70 @@
1/* linux/arch/arm/plat-s3c64xx/include/plat/dma-plat.h
2 *
3 * Copyright 2009 Openmoko, Inc.
4 * Copyright 2009 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
7 *
8 * S3C64XX DMA core
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13*/
14
15#define DMACH_LOW_LEVEL (1<<28) /* use this to specifiy hardware ch no */
16
17struct s3c64xx_dma_buff;
18
19/** s3c64xx_dma_buff - S3C64XX DMA buffer descriptor
20 * @next: Pointer to next buffer in queue or ring.
21 * @pw: Client provided identifier
22 * @lli: Pointer to hardware descriptor this buffer is associated with.
23 * @lli_dma: Hardare address of the descriptor.
24 */
25struct s3c64xx_dma_buff {
26 struct s3c64xx_dma_buff *next;
27
28 void *pw;
29 struct pl080_lli *lli;
30 dma_addr_t lli_dma;
31};
32
33struct s3c64xx_dmac;
34
35struct s3c2410_dma_chan {
36 unsigned char number; /* number of this dma channel */
37 unsigned char in_use; /* channel allocated */
38 unsigned char bit; /* bit for enable/disable/etc */
39 unsigned char hw_width;
40 unsigned char peripheral;
41
42 unsigned int flags;
43 enum s3c2410_dmasrc source;
44
45
46 dma_addr_t dev_addr;
47
48 struct s3c2410_dma_client *client;
49 struct s3c64xx_dmac *dmac; /* pointer to controller */
50
51 void __iomem *regs;
52
53 /* cdriver callbacks */
54 s3c2410_dma_cbfn_t callback_fn; /* buffer done callback */
55 s3c2410_dma_opfn_t op_fn; /* channel op callback */
56
57 /* buffer list and information */
58 struct s3c64xx_dma_buff *curr; /* current dma buffer */
59 struct s3c64xx_dma_buff *next; /* next buffer to load */
60 struct s3c64xx_dma_buff *end; /* end of queue */
61
62 /* note, when channel is running in circular mode, curr is the
63 * first buffer enqueued, end is the last and curr is where the
64 * last buffer-done event is set-at. The buffers are not freed
65 * and the last buffer hardware descriptor points back to the
66 * first.
67 */
68};
69
70#include <plat/dma-core.h>
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 07:12:35 -0500