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authorLinus Torvalds <torvalds@linux-foundation.org>2010-05-30 12:12:43 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-30 12:12:43 -0400
commite38c1e54ce51059a1aa8744c895762906cf43b32 (patch)
tree6af00994b3d07da2db3419346f740ae06f3cfe7e
parent3e9345edd8562dc4f9bbca88a598c91c8779a9c4 (diff)
parent7b8ddb06e54ad98edeb7951f317aee4d1feda9d6 (diff)
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: DMAENGINE: DMA40 U8500 platform configuration DMA: PL330: Add dma api driver
Diffstat
-rw-r--r--arch/arm/mach-ux500/clock.c2
-rw-r--r--arch/arm/mach-ux500/cpu-db8500.c4
-rw-r--r--arch/arm/mach-ux500/devices-db8500.c109
-rw-r--r--arch/arm/mach-ux500/include/mach/db8500-regs.h12
-rw-r--r--arch/arm/mach-ux500/include/mach/devices.h3
-rw-r--r--arch/arm/mach-ux500/ste-dma40-db8500.h154
-rw-r--r--drivers/dma/Kconfig9
-rw-r--r--drivers/dma/Makefile1
-rw-r--r--drivers/dma/pl330.c866
-rw-r--r--include/linux/amba/pl330.h45
10 files changed, 1204 insertions, 1 deletions
diff --git a/arch/arm/mach-ux500/clock.c b/arch/arm/mach-ux500/clock.c
index 1b2c9890e8b4..6544855af2f1 100644
--- a/arch/arm/mach-ux500/clock.c
+++ b/arch/arm/mach-ux500/clock.c
@@ -411,7 +411,7 @@ static struct clk_lookup u8500_common_clks[] = {
411 CLK(apetraceclk, "apetrace", NULL), 411 CLK(apetraceclk, "apetrace", NULL),
412 CLK(mcdeclk, "mcde", NULL), 412 CLK(mcdeclk, "mcde", NULL),
413 CLK(ipi2clk, "ipi2", NULL), 413 CLK(ipi2clk, "ipi2", NULL),
414 CLK(dmaclk, "dma40", NULL), 414 CLK(dmaclk, "dma40.0", NULL),
415 CLK(b2r2clk, "b2r2", NULL), 415 CLK(b2r2clk, "b2r2", NULL),
416 CLK(tvclk, "tv", NULL), 416 CLK(tvclk, "tv", NULL),
417}; 417};
diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index d04299f3b6b5..f21c444edd99 100644
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -32,6 +32,7 @@ static struct platform_device *platform_devs[] __initdata = {
32 &u8500_gpio_devs[6], 32 &u8500_gpio_devs[6],
33 &u8500_gpio_devs[7], 33 &u8500_gpio_devs[7],
34 &u8500_gpio_devs[8], 34 &u8500_gpio_devs[8],
35 &u8500_dma40_device,
35}; 36};
36 37
37/* minimum static i/o mapping required to boot U8500 platforms */ 38/* minimum static i/o mapping required to boot U8500 platforms */
@@ -71,6 +72,9 @@ void __init u8500_init_devices(void)
71{ 72{
72 ux500_init_devices(); 73 ux500_init_devices();
73 74
75 if (cpu_is_u8500ed())
76 dma40_u8500ed_fixup();
77
74 /* Register the platform devices */ 78 /* Register the platform devices */
75 platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs)); 79 platform_add_devices(platform_devs, ARRAY_SIZE(platform_devs));
76 80
diff --git a/arch/arm/mach-ux500/devices-db8500.c b/arch/arm/mach-ux500/devices-db8500.c
index 20334236afce..822903421943 100644
--- a/arch/arm/mach-ux500/devices-db8500.c
+++ b/arch/arm/mach-ux500/devices-db8500.c
@@ -12,9 +12,13 @@
12#include <linux/gpio.h> 12#include <linux/gpio.h>
13#include <linux/amba/bus.h> 13#include <linux/amba/bus.h>
14 14
15#include <plat/ste_dma40.h>
16
15#include <mach/hardware.h> 17#include <mach/hardware.h>
16#include <mach/setup.h> 18#include <mach/setup.h>
17 19
20#include "ste-dma40-db8500.h"
21
18static struct nmk_gpio_platform_data u8500_gpio_data[] = { 22static struct nmk_gpio_platform_data u8500_gpio_data[] = {
19 GPIO_DATA("GPIO-0-31", 0), 23 GPIO_DATA("GPIO-0-31", 0),
20 GPIO_DATA("GPIO-32-63", 32), /* 37..63 not routed to pin */ 24 GPIO_DATA("GPIO-32-63", 32), /* 37..63 not routed to pin */
@@ -105,3 +109,108 @@ struct platform_device u8500_i2c4_device = {
105 .resource = u8500_i2c4_resources, 109 .resource = u8500_i2c4_resources,
106 .num_resources = ARRAY_SIZE(u8500_i2c4_resources), 110 .num_resources = ARRAY_SIZE(u8500_i2c4_resources),
107}; 111};
112
113static struct resource dma40_resources[] = {
114 [0] = {
115 .start = U8500_DMA_BASE,
116 .end = U8500_DMA_BASE + SZ_4K - 1,
117 .flags = IORESOURCE_MEM,
118 .name = "base",
119 },
120 [1] = {
121 .start = U8500_DMA_LCPA_BASE,
122 .end = U8500_DMA_LCPA_BASE + SZ_4K - 1,
123 .flags = IORESOURCE_MEM,
124 .name = "lcpa",
125 },
126 [2] = {
127 .start = U8500_DMA_LCLA_BASE,
128 .end = U8500_DMA_LCLA_BASE + 16 * 1024 - 1,
129 .flags = IORESOURCE_MEM,
130 .name = "lcla",
131 },
132 [3] = {
133 .start = IRQ_DMA,
134 .end = IRQ_DMA,
135 .flags = IORESOURCE_IRQ}
136};
137
138/* Default configuration for physcial memcpy */
139struct stedma40_chan_cfg dma40_memcpy_conf_phy = {
140 .channel_type = (STEDMA40_CHANNEL_IN_PHY_MODE |
141 STEDMA40_LOW_PRIORITY_CHANNEL |
142 STEDMA40_PCHAN_BASIC_MODE),
143 .dir = STEDMA40_MEM_TO_MEM,
144
145 .src_info.endianess = STEDMA40_LITTLE_ENDIAN,
146 .src_info.data_width = STEDMA40_BYTE_WIDTH,
147 .src_info.psize = STEDMA40_PSIZE_PHY_1,
148
149 .dst_info.endianess = STEDMA40_LITTLE_ENDIAN,
150 .dst_info.data_width = STEDMA40_BYTE_WIDTH,
151 .dst_info.psize = STEDMA40_PSIZE_PHY_1,
152
153};
154/* Default configuration for logical memcpy */
155struct stedma40_chan_cfg dma40_memcpy_conf_log = {
156 .channel_type = (STEDMA40_CHANNEL_IN_LOG_MODE |
157 STEDMA40_LOW_PRIORITY_CHANNEL |
158 STEDMA40_LCHAN_SRC_LOG_DST_LOG |
159 STEDMA40_NO_TIM_FOR_LINK),
160 .dir = STEDMA40_MEM_TO_MEM,
161
162 .src_info.endianess = STEDMA40_LITTLE_ENDIAN,
163 .src_info.data_width = STEDMA40_BYTE_WIDTH,
164 .src_info.psize = STEDMA40_PSIZE_LOG_1,
165
166 .dst_info.endianess = STEDMA40_LITTLE_ENDIAN,
167 .dst_info.data_width = STEDMA40_BYTE_WIDTH,
168 .dst_info.psize = STEDMA40_PSIZE_LOG_1,
169
170};
171
172/*
173 * Mapping between destination event lines and physical device address.
174 * The event line is tied to a device and therefor the address is constant.
175 */
176static const dma_addr_t dma40_tx_map[STEDMA40_NR_DEV];
177
178/* Mapping between source event lines and physical device address */
179static const dma_addr_t dma40_rx_map[STEDMA40_NR_DEV];
180
181/* Reserved event lines for memcpy only */
182static int dma40_memcpy_event[] = {
183 STEDMA40_MEMCPY_TX_1,
184 STEDMA40_MEMCPY_TX_2,
185 STEDMA40_MEMCPY_TX_3,
186 STEDMA40_MEMCPY_TX_4,
187};
188
189static struct stedma40_platform_data dma40_plat_data = {
190 .dev_len = STEDMA40_NR_DEV,
191 .dev_rx = dma40_rx_map,
192 .dev_tx = dma40_tx_map,
193 .memcpy = dma40_memcpy_event,
194 .memcpy_len = ARRAY_SIZE(dma40_memcpy_event),
195 .memcpy_conf_phy = &dma40_memcpy_conf_phy,
196 .memcpy_conf_log = &dma40_memcpy_conf_log,
197 .llis_per_log = 8,
198};
199
200struct platform_device u8500_dma40_device = {
201 .dev = {
202 .platform_data = &dma40_plat_data,
203 },
204 .name = "dma40",
205 .id = 0,
206 .num_resources = ARRAY_SIZE(dma40_resources),
207 .resource = dma40_resources
208};
209
210void dma40_u8500ed_fixup(void)
211{
212 dma40_plat_data.memcpy = NULL;
213 dma40_plat_data.memcpy_len = 0;
214 dma40_resources[0].start = U8500_DMA_BASE_ED;
215 dma40_resources[0].end = U8500_DMA_BASE_ED + SZ_4K - 1;
216}
diff --git a/arch/arm/mach-ux500/include/mach/db8500-regs.h b/arch/arm/mach-ux500/include/mach/db8500-regs.h
index 9169e1e382a3..85fc6a80b386 100644
--- a/arch/arm/mach-ux500/include/mach/db8500-regs.h
+++ b/arch/arm/mach-ux500/include/mach/db8500-regs.h
@@ -7,6 +7,18 @@
7#ifndef __MACH_DB8500_REGS_H 7#ifndef __MACH_DB8500_REGS_H
8#define __MACH_DB8500_REGS_H 8#define __MACH_DB8500_REGS_H
9 9
10/* Base address and bank offsets for ESRAM */
11#define U8500_ESRAM_BASE 0x40000000
12#define U8500_ESRAM_BANK_SIZE 0x00020000
13#define U8500_ESRAM_BANK0 U8500_ESRAM_BASE
14#define U8500_ESRAM_BANK1 (U8500_ESRAM_BASE + U8500_ESRAM_BANK_SIZE)
15#define U8500_ESRAM_BANK2 (U8500_ESRAM_BANK1 + U8500_ESRAM_BANK_SIZE)
16#define U8500_ESRAM_BANK3 (U8500_ESRAM_BANK2 + U8500_ESRAM_BANK_SIZE)
17#define U8500_ESRAM_BANK4 (U8500_ESRAM_BANK3 + U8500_ESRAM_BANK_SIZE)
18/* Use bank 4 for DMA LCLA and LCPA */
19#define U8500_DMA_LCLA_BASE U8500_ESRAM_BANK4
20#define U8500_DMA_LCPA_BASE (U8500_ESRAM_BANK4 + 0x4000)
21
10#define U8500_PER3_BASE 0x80000000 22#define U8500_PER3_BASE 0x80000000
11#define U8500_STM_BASE 0x80100000 23#define U8500_STM_BASE 0x80100000
12#define U8500_STM_REG_BASE (U8500_STM_BASE + 0xF000) 24#define U8500_STM_REG_BASE (U8500_STM_BASE + 0xF000)
diff --git a/arch/arm/mach-ux500/include/mach/devices.h b/arch/arm/mach-ux500/include/mach/devices.h
index 0422af00a56e..c2b2f2574947 100644
--- a/arch/arm/mach-ux500/include/mach/devices.h
+++ b/arch/arm/mach-ux500/include/mach/devices.h
@@ -25,5 +25,8 @@ extern struct platform_device ux500_i2c3_device;
25 25
26extern struct platform_device u8500_i2c0_device; 26extern struct platform_device u8500_i2c0_device;
27extern struct platform_device u8500_i2c4_device; 27extern struct platform_device u8500_i2c4_device;
28extern struct platform_device u8500_dma40_device;
29
30void dma40_u8500ed_fixup(void);
28 31
29#endif 32#endif
diff --git a/arch/arm/mach-ux500/ste-dma40-db8500.h b/arch/arm/mach-ux500/ste-dma40-db8500.h
new file mode 100644
index 000000000000..e7016278dfa9
--- /dev/null
+++ b/arch/arm/mach-ux500/ste-dma40-db8500.h
@@ -0,0 +1,154 @@
1/*
2 * arch/arm/mach-ux500/ste_dma40_db8500.h
3 * DB8500-SoC-specific configuration for DMA40
4 *
5 * Copyright (C) ST-Ericsson 2007-2010
6 * License terms: GNU General Public License (GPL) version 2
7 * Author: Per Friden <per.friden@stericsson.com>
8 * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
9 */
10#ifndef STE_DMA40_DB8500_H
11#define STE_DMA40_DB8500_H
12
13#define STEDMA40_NR_DEV 64
14
15enum dma_src_dev_type {
16 STEDMA40_DEV_SPI0_RX = 0,
17 STEDMA40_DEV_SD_MMC0_RX = 1,
18 STEDMA40_DEV_SD_MMC1_RX = 2,
19 STEDMA40_DEV_SD_MMC2_RX = 3,
20 STEDMA40_DEV_I2C1_RX = 4,
21 STEDMA40_DEV_I2C3_RX = 5,
22 STEDMA40_DEV_I2C2_RX = 6,
23 STEDMA40_DEV_I2C4_RX = 7, /* Only on V1 */
24 STEDMA40_DEV_SSP0_RX = 8,
25 STEDMA40_DEV_SSP1_RX = 9,
26 STEDMA40_DEV_MCDE_RX = 10,
27 STEDMA40_DEV_UART2_RX = 11,
28 STEDMA40_DEV_UART1_RX = 12,
29 STEDMA40_DEV_UART0_RX = 13,
30 STEDMA40_DEV_MSP2_RX = 14,
31 STEDMA40_DEV_I2C0_RX = 15,
32 STEDMA40_DEV_USB_OTG_IEP_8 = 16,
33 STEDMA40_DEV_USB_OTG_IEP_1_9 = 17,
34 STEDMA40_DEV_USB_OTG_IEP_2_10 = 18,
35 STEDMA40_DEV_USB_OTG_IEP_3_11 = 19,
36 STEDMA40_DEV_SLIM0_CH0_RX_HSI_RX_CH0 = 20,
37 STEDMA40_DEV_SLIM0_CH1_RX_HSI_RX_CH1 = 21,
38 STEDMA40_DEV_SLIM0_CH2_RX_HSI_RX_CH2 = 22,
39 STEDMA40_DEV_SLIM0_CH3_RX_HSI_RX_CH3 = 23,
40 STEDMA40_DEV_SRC_SXA0_RX_TX = 24,
41 STEDMA40_DEV_SRC_SXA1_RX_TX = 25,
42 STEDMA40_DEV_SRC_SXA2_RX_TX = 26,
43 STEDMA40_DEV_SRC_SXA3_RX_TX = 27,
44 STEDMA40_DEV_SD_MM2_RX = 28,
45 STEDMA40_DEV_SD_MM0_RX = 29,
46 STEDMA40_DEV_MSP1_RX = 30,
47 /*
48 * This channel is either SlimBus or MSP,
49 * never both at the same time.
50 */
51 STEDMA40_SLIM0_CH0_RX = 31,
52 STEDMA40_DEV_MSP0_RX = 31,
53 STEDMA40_DEV_SD_MM1_RX = 32,
54 STEDMA40_DEV_SPI2_RX = 33,
55 STEDMA40_DEV_I2C3_RX2 = 34,
56 STEDMA40_DEV_SPI1_RX = 35,
57 STEDMA40_DEV_USB_OTG_IEP_4_12 = 36,
58 STEDMA40_DEV_USB_OTG_IEP_5_13 = 37,
59 STEDMA40_DEV_USB_OTG_IEP_6_14 = 38,
60 STEDMA40_DEV_USB_OTG_IEP_7_15 = 39,
61 STEDMA40_DEV_SPI3_RX = 40,
62 STEDMA40_DEV_SD_MM3_RX = 41,
63 STEDMA40_DEV_SD_MM4_RX = 42,
64 STEDMA40_DEV_SD_MM5_RX = 43,
65 STEDMA40_DEV_SRC_SXA4_RX_TX = 44,
66 STEDMA40_DEV_SRC_SXA5_RX_TX = 45,
67 STEDMA40_DEV_SRC_SXA6_RX_TX = 46,
68 STEDMA40_DEV_SRC_SXA7_RX_TX = 47,
69 STEDMA40_DEV_CAC1_RX = 48,
70 /* RX channels 49 and 50 are unused */
71 STEDMA40_DEV_MSHC_RX = 51,
72 STEDMA40_DEV_SLIM1_CH0_RX_HSI_RX_CH4 = 52,
73 STEDMA40_DEV_SLIM1_CH1_RX_HSI_RX_CH5 = 53,
74 STEDMA40_DEV_SLIM1_CH2_RX_HSI_RX_CH6 = 54,
75 STEDMA40_DEV_SLIM1_CH3_RX_HSI_RX_CH7 = 55,
76 /* RX channels 56 thru 60 are unused */
77 STEDMA40_DEV_CAC0_RX = 61,
78 /* RX channels 62 and 63 are unused */
79};
80
81enum dma_dest_dev_type {
82 STEDMA40_DEV_SPI0_TX = 0,
83 STEDMA40_DEV_SD_MMC0_TX = 1,
84 STEDMA40_DEV_SD_MMC1_TX = 2,
85 STEDMA40_DEV_SD_MMC2_TX = 3,
86 STEDMA40_DEV_I2C1_TX = 4,
87 STEDMA40_DEV_I2C3_TX = 5,
88 STEDMA40_DEV_I2C2_TX = 6,
89 STEDMA50_DEV_I2C4_TX = 7, /* Only on V1 */
90 STEDMA40_DEV_SSP0_TX = 8,
91 STEDMA40_DEV_SSP1_TX = 9,
92 /* TX channel 10 is unused */
93 STEDMA40_DEV_UART2_TX = 11,
94 STEDMA40_DEV_UART1_TX = 12,
95 STEDMA40_DEV_UART0_TX= 13,
96 STEDMA40_DEV_MSP2_TX = 14,
97 STEDMA40_DEV_I2C0_TX = 15,
98 STEDMA40_DEV_USB_OTG_OEP_8 = 16,
99 STEDMA40_DEV_USB_OTG_OEP_1_9 = 17,
100 STEDMA40_DEV_USB_OTG_OEP_2_10= 18,
101 STEDMA40_DEV_USB_OTG_OEP_3_11 = 19,
102 STEDMA40_DEV_SLIM0_CH0_TX_HSI_TX_CH0 = 20,
103 STEDMA40_DEV_SLIM0_CH1_TX_HSI_TX_CH1 = 21,
104 STEDMA40_DEV_SLIM0_CH2_TX_HSI_TX_CH2 = 22,
105 STEDMA40_DEV_SLIM0_CH3_TX_HSI_TX_CH3 = 23,
106 STEDMA40_DEV_DST_SXA0_RX_TX = 24,
107 STEDMA40_DEV_DST_SXA1_RX_TX = 25,
108 STEDMA40_DEV_DST_SXA2_RX_TX = 26,
109 STEDMA40_DEV_DST_SXA3_RX_TX = 27,
110 STEDMA40_DEV_SD_MM2_TX = 28,
111 STEDMA40_DEV_SD_MM0_TX = 29,
112 STEDMA40_DEV_MSP1_TX = 30,
113 /*
114 * This channel is either SlimBus or MSP,
115 * never both at the same time.
116 */
117 STEDMA40_SLIM0_CH0_TX = 31,
118 STEDMA40_DEV_MSP0_TX = 31,
119 STEDMA40_DEV_SD_MM1_TX = 32,
120 STEDMA40_DEV_SPI2_TX = 33,
121 /* Secondary I2C3 channel */
122 STEDMA40_DEV_I2C3_TX2 = 34,
123 STEDMA40_DEV_SPI1_TX = 35,
124 STEDMA40_DEV_USB_OTG_OEP_4_12 = 36,
125 STEDMA40_DEV_USB_OTG_OEP_5_13 = 37,
126 STEDMA40_DEV_USB_OTG_OEP_6_14 = 38,
127 STEDMA40_DEV_USB_OTG_OEP_7_15 = 39,
128 STEDMA40_DEV_SPI3_TX = 40,
129 STEDMA40_DEV_SD_MM3_TX = 41,
130 STEDMA40_DEV_SD_MM4_TX = 42,
131 STEDMA40_DEV_SD_MM5_TX = 43,
132 STEDMA40_DEV_DST_SXA4_RX_TX = 44,
133 STEDMA40_DEV_DST_SXA5_RX_TX = 45,
134 STEDMA40_DEV_DST_SXA6_RX_TX = 46,
135 STEDMA40_DEV_DST_SXA7_RX_TX = 47,
136 STEDMA40_DEV_CAC1_TX = 48,
137 STEDMA40_DEV_CAC1_TX_HAC1_TX = 49,
138 STEDMA40_DEV_HAC1_TX = 50,
139 STEDMA40_MEMXCPY_TX_0 = 51,
140 STEDMA40_DEV_SLIM1_CH0_TX_HSI_TX_CH4 = 52,
141 STEDMA40_DEV_SLIM1_CH1_TX_HSI_TX_CH5 = 53,
142 STEDMA40_DEV_SLIM1_CH2_TX_HSI_TX_CH6 = 54,
143 STEDMA40_DEV_SLIM1_CH3_TX_HSI_TX_CH7 = 55,
144 STEDMA40_MEMCPY_TX_1 = 56,
145 STEDMA40_MEMCPY_TX_2 = 57,
146 STEDMA40_MEMCPY_TX_3 = 58,
147 STEDMA40_MEMCPY_TX_4 = 59,
148 STEDMA40_MEMCPY_TX_5 = 60,
149 STEDMA40_DEV_CAC0_TX = 61,
150 STEDMA40_DEV_CAC0_TX_HAC0_TX = 62,
151 STEDMA40_DEV_HAC0_TX = 63,
152};
153
154#endif
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 1b8877922fb0..9e01e96fee94 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -166,6 +166,15 @@ config TIMB_DMA
166config ARCH_HAS_ASYNC_TX_FIND_CHANNEL 166config ARCH_HAS_ASYNC_TX_FIND_CHANNEL
167 bool 167 bool
168 168
169config PL330_DMA
170 tristate "DMA API Driver for PL330"
171 select DMA_ENGINE
172 depends on PL330
173 help
174 Select if your platform has one or more PL330 DMACs.
175 You need to provide platform specific settings via
176 platform_data for a dma-pl330 device.
177
169config DMA_ENGINE 178config DMA_ENGINE
170 bool 179 bool
171 180
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 20881426c1ac..0fe5ebbfda5d 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -22,3 +22,4 @@ obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o
22obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += ppc4xx/ 22obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += ppc4xx/
23obj-$(CONFIG_TIMB_DMA) += timb_dma.o 23obj-$(CONFIG_TIMB_DMA) += timb_dma.o
24obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o 24obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
25obj-$(CONFIG_PL330_DMA) += pl330.o
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
new file mode 100644
index 000000000000..7c50f6dfd3f4
--- /dev/null
+++ b/drivers/dma/pl330.c
@@ -0,0 +1,866 @@
1/* linux/drivers/dma/pl330.c
2 *
3 * Copyright (C) 2010 Samsung Electronics Co. Ltd.
4 * Jaswinder Singh <jassi.brar@samsung.com>
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 as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/io.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/module.h>
16#include <linux/dmaengine.h>
17#include <linux/interrupt.h>
18#include <linux/amba/bus.h>
19#include <linux/amba/pl330.h>
20
21#define NR_DEFAULT_DESC 16
22
23enum desc_status {
24 /* In the DMAC pool */
25 FREE,
26 /*
27 * Allocted to some channel during prep_xxx
28 * Also may be sitting on the work_list.
29 */
30 PREP,
31 /*
32 * Sitting on the work_list and already submitted
33 * to the PL330 core. Not more than two descriptors
34 * of a channel can be BUSY at any time.
35 */
36 BUSY,
37 /*
38 * Sitting on the channel work_list but xfer done
39 * by PL330 core
40 */
41 DONE,
42};
43
44struct dma_pl330_chan {
45 /* Schedule desc completion */
46 struct tasklet_struct task;
47
48 /* DMA-Engine Channel */
49 struct dma_chan chan;
50
51 /* Last completed cookie */
52 dma_cookie_t completed;
53
54 /* List of to be xfered descriptors */
55 struct list_head work_list;
56
57 /* Pointer to the DMAC that manages this channel,
58 * NULL if the channel is available to be acquired.
59 * As the parent, this DMAC also provides descriptors
60 * to the channel.
61 */
62 struct dma_pl330_dmac *dmac;
63
64 /* To protect channel manipulation */
65 spinlock_t lock;
66
67 /* Token of a hardware channel thread of PL330 DMAC
68 * NULL if the channel is available to be acquired.
69 */
70 void *pl330_chid;
71};
72
73struct dma_pl330_dmac {
74 struct pl330_info pif;
75
76 /* DMA-Engine Device */
77 struct dma_device ddma;
78
79 /* Pool of descriptors available for the DMAC's channels */
80 struct list_head desc_pool;
81 /* To protect desc_pool manipulation */
82 spinlock_t pool_lock;
83
84 /* Peripheral channels connected to this DMAC */
85 struct dma_pl330_chan peripherals[0]; /* keep at end */
86};
87
88struct dma_pl330_desc {
89 /* To attach to a queue as child */
90 struct list_head node;
91
92 /* Descriptor for the DMA Engine API */
93 struct dma_async_tx_descriptor txd;
94
95 /* Xfer for PL330 core */
96 struct pl330_xfer px;
97
98 struct pl330_reqcfg rqcfg;
99 struct pl330_req req;
100
101 enum desc_status status;
102
103 /* The channel which currently holds this desc */
104 struct dma_pl330_chan *pchan;
105};
106
107static inline struct dma_pl330_chan *
108to_pchan(struct dma_chan *ch)
109{
110 if (!ch)
111 return NULL;
112
113 return container_of(ch, struct dma_pl330_chan, chan);
114}
115
116static inline struct dma_pl330_desc *
117to_desc(struct dma_async_tx_descriptor *tx)
118{
119 return container_of(tx, struct dma_pl330_desc, txd);
120}
121
122static inline void free_desc_list(struct list_head *list)
123{
124 struct dma_pl330_dmac *pdmac;
125 struct dma_pl330_desc *desc;
126 struct dma_pl330_chan *pch;
127 unsigned long flags;
128
129 if (list_empty(list))
130 return;
131
132 /* Finish off the work list */
133 list_for_each_entry(desc, list, node) {
134 dma_async_tx_callback callback;
135 void *param;
136
137 /* All desc in a list belong to same channel */
138 pch = desc->pchan;
139 callback = desc->txd.callback;
140 param = desc->txd.callback_param;
141
142 if (callback)
143 callback(param);
144
145 desc->pchan = NULL;
146 }
147
148 pdmac = pch->dmac;
149
150 spin_lock_irqsave(&pdmac->pool_lock, flags);
151 list_splice_tail_init(list, &pdmac->desc_pool);
152 spin_unlock_irqrestore(&pdmac->pool_lock, flags);
153}
154
155static inline void fill_queue(struct dma_pl330_chan *pch)
156{
157 struct dma_pl330_desc *desc;
158 int ret;
159
160 list_for_each_entry(desc, &pch->work_list, node) {
161
162 /* If already submitted */
163 if (desc->status == BUSY)
164 break;
165
166 ret = pl330_submit_req(pch->pl330_chid,
167 &desc->req);
168 if (!ret) {
169 desc->status = BUSY;
170 break;
171 } else if (ret == -EAGAIN) {
172 /* QFull or DMAC Dying */
173 break;
174 } else {
175 /* Unacceptable request */
176 desc->status = DONE;
177 dev_err(pch->dmac->pif.dev, "%s:%d Bad Desc(%d)\n",
178 __func__, __LINE__, desc->txd.cookie);
179 tasklet_schedule(&pch->task);
180 }
181 }
182}
183
184static void pl330_tasklet(unsigned long data)
185{
186 struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data;
187 struct dma_pl330_desc *desc, *_dt;
188 unsigned long flags;
189 LIST_HEAD(list);
190
191 spin_lock_irqsave(&pch->lock, flags);
192
193 /* Pick up ripe tomatoes */
194 list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
195 if (desc->status == DONE) {
196 pch->completed = desc->txd.cookie;
197 list_move_tail(&desc->node, &list);
198 }
199
200 /* Try to submit a req imm. next to the last completed cookie */
201 fill_queue(pch);
202
203 /* Make sure the PL330 Channel thread is active */
204 pl330_chan_ctrl(pch->pl330_chid, PL330_OP_START);
205
206 spin_unlock_irqrestore(&pch->lock, flags);
207
208 free_desc_list(&list);
209}
210
211static void dma_pl330_rqcb(void *token, enum pl330_op_err err)
212{
213 struct dma_pl330_desc *desc = token;
214 struct dma_pl330_chan *pch = desc->pchan;
215 unsigned long flags;
216
217 /* If desc aborted */
218 if (!pch)
219 return;
220
221 spin_lock_irqsave(&pch->lock, flags);
222
223 desc->status = DONE;
224
225 spin_unlock_irqrestore(&pch->lock, flags);
226
227 tasklet_schedule(&pch->task);
228}
229
230static int pl330_alloc_chan_resources(struct dma_chan *chan)
231{
232 struct dma_pl330_chan *pch = to_pchan(chan);
233 struct dma_pl330_dmac *pdmac = pch->dmac;
234 unsigned long flags;
235
236 spin_lock_irqsave(&pch->lock, flags);
237
238 pch->completed = chan->cookie = 1;
239
240 pch->pl330_chid = pl330_request_channel(&pdmac->pif);
241 if (!pch->pl330_chid) {
242 spin_unlock_irqrestore(&pch->lock, flags);
243 return 0;
244 }
245
246 tasklet_init(&pch->task, pl330_tasklet, (unsigned long) pch);
247
248 spin_unlock_irqrestore(&pch->lock, flags);
249
250 return 1;
251}
252
253static int pl330_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg)
254{
255 struct dma_pl330_chan *pch = to_pchan(chan);
256 struct dma_pl330_desc *desc;
257 unsigned long flags;
258
259 /* Only supports DMA_TERMINATE_ALL */
260 if (cmd != DMA_TERMINATE_ALL)
261 return -ENXIO;
262
263 spin_lock_irqsave(&pch->lock, flags);
264
265 /* FLUSH the PL330 Channel thread */
266 pl330_chan_ctrl(pch->pl330_chid, PL330_OP_FLUSH);
267
268 /* Mark all desc done */
269 list_for_each_entry(desc, &pch->work_list, node)
270 desc->status = DONE;
271
272 spin_unlock_irqrestore(&pch->lock, flags);
273
274 pl330_tasklet((unsigned long) pch);
275
276 return 0;
277}
278
279static void pl330_free_chan_resources(struct dma_chan *chan)
280{
281 struct dma_pl330_chan *pch = to_pchan(chan);
282 unsigned long flags;
283
284 spin_lock_irqsave(&pch->lock, flags);
285
286 tasklet_kill(&pch->task);
287
288 pl330_release_channel(pch->pl330_chid);
289 pch->pl330_chid = NULL;
290
291 spin_unlock_irqrestore(&pch->lock, flags);
292}
293
294static enum dma_status
295pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
296 struct dma_tx_state *txstate)
297{
298 struct dma_pl330_chan *pch = to_pchan(chan);
299 dma_cookie_t last_done, last_used;
300 int ret;
301
302 last_done = pch->completed;
303 last_used = chan->cookie;
304
305 ret = dma_async_is_complete(cookie, last_done, last_used);
306
307 dma_set_tx_state(txstate, last_done, last_used, 0);
308
309 return ret;
310}
311
312static void pl330_issue_pending(struct dma_chan *chan)
313{
314 pl330_tasklet((unsigned long) to_pchan(chan));
315}
316
317/*
318 * We returned the last one of the circular list of descriptor(s)
319 * from prep_xxx, so the argument to submit corresponds to the last
320 * descriptor of the list.
321 */
322static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx)
323{
324 struct dma_pl330_desc *desc, *last = to_desc(tx);
325 struct dma_pl330_chan *pch = to_pchan(tx->chan);
326 dma_cookie_t cookie;
327 unsigned long flags;
328
329 spin_lock_irqsave(&pch->lock, flags);
330
331 /* Assign cookies to all nodes */
332 cookie = tx->chan->cookie;
333
334 while (!list_empty(&last->node)) {
335 desc = list_entry(last->node.next, struct dma_pl330_desc, node);
336
337 if (++cookie < 0)
338 cookie = 1;
339 desc->txd.cookie = cookie;
340
341 list_move_tail(&desc->node, &pch->work_list);
342 }
343
344 if (++cookie < 0)
345 cookie = 1;
346 last->txd.cookie = cookie;
347
348 list_add_tail(&last->node, &pch->work_list);
349
350 tx->chan->cookie = cookie;
351
352 spin_unlock_irqrestore(&pch->lock, flags);
353
354 return cookie;
355}
356
357static inline void _init_desc(struct dma_pl330_desc *desc)
358{
359 desc->pchan = NULL;
360 desc->req.x = &desc->px;
361 desc->req.token = desc;
362 desc->rqcfg.swap = SWAP_NO;
363 desc->rqcfg.privileged = 0;
364 desc->rqcfg.insnaccess = 0;
365 desc->rqcfg.scctl = SCCTRL0;
366 desc->rqcfg.dcctl = DCCTRL0;
367 desc->req.cfg = &desc->rqcfg;
368 desc->req.xfer_cb = dma_pl330_rqcb;
369 desc->txd.tx_submit = pl330_tx_submit;
370
371 INIT_LIST_HEAD(&desc->node);
372}
373
374/* Returns the number of descriptors added to the DMAC pool */
375int add_desc(struct dma_pl330_dmac *pdmac, gfp_t flg, int count)
376{
377 struct dma_pl330_desc *desc;
378 unsigned long flags;
379 int i;
380
381 if (!pdmac)
382 return 0;
383
384 desc = kmalloc(count * sizeof(*desc), flg);
385 if (!desc)
386 return 0;
387
388 spin_lock_irqsave(&pdmac->pool_lock, flags);
389
390 for (i = 0; i < count; i++) {
391 _init_desc(&desc[i]);
392 list_add_tail(&desc[i].node, &pdmac->desc_pool);
393 }
394
395 spin_unlock_irqrestore(&pdmac->pool_lock, flags);
396
397 return count;
398}
399
400static struct dma_pl330_desc *
401pluck_desc(struct dma_pl330_dmac *pdmac)
402{
403 struct dma_pl330_desc *desc = NULL;
404 unsigned long flags;
405
406 if (!pdmac)
407 return NULL;
408
409 spin_lock_irqsave(&pdmac->pool_lock, flags);
410
411 if (!list_empty(&pdmac->desc_pool)) {
412 desc = list_entry(pdmac->desc_pool.next,
413 struct dma_pl330_desc, node);
414
415 list_del_init(&desc->node);
416
417 desc->status = PREP;
418 desc->txd.callback = NULL;
419 }
420
421 spin_unlock_irqrestore(&pdmac->pool_lock, flags);
422
423 return desc;
424}
425
426static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch)
427{
428 struct dma_pl330_dmac *pdmac = pch->dmac;
429 struct dma_pl330_peri *peri = pch->chan.private;
430 struct dma_pl330_desc *desc;
431
432 /* Pluck one desc from the pool of DMAC */
433 desc = pluck_desc(pdmac);
434
435 /* If the DMAC pool is empty, alloc new */
436 if (!desc) {
437 if (!add_desc(pdmac, GFP_ATOMIC, 1))
438 return NULL;
439
440 /* Try again */
441 desc = pluck_desc(pdmac);
442 if (!desc) {
443 dev_err(pch->dmac->pif.dev,
444 "%s:%d ALERT!\n", __func__, __LINE__);
445 return NULL;
446 }
447 }
448
449 /* Initialize the descriptor */
450 desc->pchan = pch;
451 desc->txd.cookie = 0;
452 async_tx_ack(&desc->txd);
453
454 desc->req.rqtype = peri->rqtype;
455 desc->req.peri = peri->peri_id;
456
457 dma_async_tx_descriptor_init(&desc->txd, &pch->chan);
458
459 return desc;
460}
461
462static inline void fill_px(struct pl330_xfer *px,
463 dma_addr_t dst, dma_addr_t src, size_t len)
464{
465 px->next = NULL;
466 px->bytes = len;
467 px->dst_addr = dst;
468 px->src_addr = src;
469}
470
471static struct dma_pl330_desc *
472__pl330_prep_dma_memcpy(struct dma_pl330_chan *pch, dma_addr_t dst,
473 dma_addr_t src, size_t len)
474{
475 struct dma_pl330_desc *desc = pl330_get_desc(pch);
476
477 if (!desc) {
478 dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n",
479 __func__, __LINE__);
480 return NULL;
481 }
482
483 /*
484 * Ideally we should lookout for reqs bigger than
485 * those that can be programmed with 256 bytes of
486 * MC buffer, but considering a req size is seldom
487 * going to be word-unaligned and more than 200MB,
488 * we take it easy.
489 * Also, should the limit is reached we'd rather
490 * have the platform increase MC buffer size than
491 * complicating this API driver.
492 */
493 fill_px(&desc->px, dst, src, len);
494
495 return desc;
496}
497
498/* Call after fixing burst size */
499static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len)
500{
501 struct dma_pl330_chan *pch = desc->pchan;
502 struct pl330_info *pi = &pch->dmac->pif;
503 int burst_len;
504
505 burst_len = pi->pcfg.data_bus_width / 8;
506 burst_len *= pi->pcfg.data_buf_dep;
507 burst_len >>= desc->rqcfg.brst_size;
508
509 /* src/dst_burst_len can't be more than 16 */
510 if (burst_len > 16)
511 burst_len = 16;
512
513 while (burst_len > 1) {
514 if (!(len % (burst_len << desc->rqcfg.brst_size)))
515 break;
516 burst_len--;
517 }
518
519 return burst_len;
520}
521
522static struct dma_async_tx_descriptor *
523pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst,
524 dma_addr_t src, size_t len, unsigned long flags)
525{
526 struct dma_pl330_desc *desc;
527 struct dma_pl330_chan *pch = to_pchan(chan);
528 struct dma_pl330_peri *peri = chan->private;
529 struct pl330_info *pi;
530 int burst;
531
532 if (unlikely(!pch || !len || !peri))
533 return NULL;
534
535 if (peri->rqtype != MEMTOMEM)
536 return NULL;
537
538 pi = &pch->dmac->pif;
539
540 desc = __pl330_prep_dma_memcpy(pch, dst, src, len);
541 if (!desc)
542 return NULL;
543
544 desc->rqcfg.src_inc = 1;
545 desc->rqcfg.dst_inc = 1;
546
547 /* Select max possible burst size */
548 burst = pi->pcfg.data_bus_width / 8;
549
550 while (burst > 1) {
551 if (!(len % burst))
552 break;
553 burst /= 2;
554 }
555
556 desc->rqcfg.brst_size = 0;
557 while (burst != (1 << desc->rqcfg.brst_size))
558 desc->rqcfg.brst_size++;
559
560 desc->rqcfg.brst_len = get_burst_len(desc, len);
561
562 desc->txd.flags = flags;
563
564 return &desc->txd;
565}
566
567static struct dma_async_tx_descriptor *
568pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
569 unsigned int sg_len, enum dma_data_direction direction,
570 unsigned long flg)
571{
572 struct dma_pl330_desc *first, *desc = NULL;
573 struct dma_pl330_chan *pch = to_pchan(chan);
574 struct dma_pl330_peri *peri = chan->private;
575 struct scatterlist *sg;
576 unsigned long flags;
577 int i, burst_size;
578 dma_addr_t addr;
579
580 if (unlikely(!pch || !sgl || !sg_len))
581 return NULL;
582
583 /* Make sure the direction is consistent */
584 if ((direction == DMA_TO_DEVICE &&
585 peri->rqtype != MEMTODEV) ||
586 (direction == DMA_FROM_DEVICE &&
587 peri->rqtype != DEVTOMEM)) {
588 dev_err(pch->dmac->pif.dev, "%s:%d Invalid Direction\n",
589 __func__, __LINE__);
590 return NULL;
591 }
592
593 addr = peri->fifo_addr;
594 burst_size = peri->burst_sz;
595
596 first = NULL;
597
598 for_each_sg(sgl, sg, sg_len, i) {
599
600 desc = pl330_get_desc(pch);
601 if (!desc) {
602 struct dma_pl330_dmac *pdmac = pch->dmac;
603
604 dev_err(pch->dmac->pif.dev,
605 "%s:%d Unable to fetch desc\n",
606 __func__, __LINE__);
607 if (!first)
608 return NULL;
609
610 spin_lock_irqsave(&pdmac->pool_lock, flags);
611
612 while (!list_empty(&first->node)) {
613 desc = list_entry(first->node.next,
614 struct dma_pl330_desc, node);
615 list_move_tail(&desc->node, &pdmac->desc_pool);
616 }
617
618 list_move_tail(&first->node, &pdmac->desc_pool);
619
620 spin_unlock_irqrestore(&pdmac->pool_lock, flags);
621
622 return NULL;
623 }
624
625 if (!first)
626 first = desc;
627 else
628 list_add_tail(&desc->node, &first->node);
629
630 if (direction == DMA_TO_DEVICE) {
631 desc->rqcfg.src_inc = 1;
632 desc->rqcfg.dst_inc = 0;
633 fill_px(&desc->px,
634 addr, sg_dma_address(sg), sg_dma_len(sg));
635 } else {
636 desc->rqcfg.src_inc = 0;
637 desc->rqcfg.dst_inc = 1;
638 fill_px(&desc->px,
639 sg_dma_address(sg), addr, sg_dma_len(sg));
640 }
641
642 desc->rqcfg.brst_size = burst_size;
643 desc->rqcfg.brst_len = 1;
644 }
645
646 /* Return the last desc in the chain */
647 desc->txd.flags = flg;
648 return &desc->txd;
649}
650
651static irqreturn_t pl330_irq_handler(int irq, void *data)
652{
653 if (pl330_update(data))
654 return IRQ_HANDLED;
655 else
656 return IRQ_NONE;
657}
658
659static int __devinit
660pl330_probe(struct amba_device *adev, struct amba_id *id)
661{
662 struct dma_pl330_platdata *pdat;
663 struct dma_pl330_dmac *pdmac;
664 struct dma_pl330_chan *pch;
665 struct pl330_info *pi;
666 struct dma_device *pd;
667 struct resource *res;
668 int i, ret, irq;
669
670 pdat = adev->dev.platform_data;
671
672 if (!pdat || !pdat->nr_valid_peri) {
673 dev_err(&adev->dev, "platform data missing\n");
674 return -ENODEV;
675 }
676
677 /* Allocate a new DMAC and its Channels */
678 pdmac = kzalloc(pdat->nr_valid_peri * sizeof(*pch)
679 + sizeof(*pdmac), GFP_KERNEL);
680 if (!pdmac) {
681 dev_err(&adev->dev, "unable to allocate mem\n");
682 return -ENOMEM;
683 }
684
685 pi = &pdmac->pif;
686 pi->dev = &adev->dev;
687 pi->pl330_data = NULL;
688 pi->mcbufsz = pdat->mcbuf_sz;
689
690 res = &adev->res;
691 request_mem_region(res->start, resource_size(res), "dma-pl330");
692
693 pi->base = ioremap(res->start, resource_size(res));
694 if (!pi->base) {
695 ret = -ENXIO;
696 goto probe_err1;
697 }
698
699 irq = adev->irq[0];
700 ret = request_irq(irq, pl330_irq_handler, 0,
701 dev_name(&adev->dev), pi);
702 if (ret)
703 goto probe_err2;
704
705 ret = pl330_add(pi);
706 if (ret)
707 goto probe_err3;
708
709 INIT_LIST_HEAD(&pdmac->desc_pool);
710 spin_lock_init(&pdmac->pool_lock);
711
712 /* Create a descriptor pool of default size */
713 if (!add_desc(pdmac, GFP_KERNEL, NR_DEFAULT_DESC))
714 dev_warn(&adev->dev, "unable to allocate desc\n");
715
716 pd = &pdmac->ddma;
717 INIT_LIST_HEAD(&pd->channels);
718
719 /* Initialize channel parameters */
720 for (i = 0; i < pdat->nr_valid_peri; i++) {
721 struct dma_pl330_peri *peri = &pdat->peri[i];
722 pch = &pdmac->peripherals[i];
723
724 switch (peri->rqtype) {
725 case MEMTOMEM:
726 dma_cap_set(DMA_MEMCPY, pd->cap_mask);
727 break;
728 case MEMTODEV:
729 case DEVTOMEM:
730 dma_cap_set(DMA_SLAVE, pd->cap_mask);
731 break;
732 default:
733 dev_err(&adev->dev, "DEVTODEV Not Supported\n");
734 continue;
735 }
736
737 INIT_LIST_HEAD(&pch->work_list);
738 spin_lock_init(&pch->lock);
739 pch->pl330_chid = NULL;
740 pch->chan.private = peri;
741 pch->chan.device = pd;
742 pch->chan.chan_id = i;
743 pch->dmac = pdmac;
744
745 /* Add the channel to the DMAC list */
746 pd->chancnt++;
747 list_add_tail(&pch->chan.device_node, &pd->channels);
748 }
749
750 pd->dev = &adev->dev;
751
752 pd->device_alloc_chan_resources = pl330_alloc_chan_resources;
753 pd->device_free_chan_resources = pl330_free_chan_resources;
754 pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy;
755 pd->device_tx_status = pl330_tx_status;
756 pd->device_prep_slave_sg = pl330_prep_slave_sg;
757 pd->device_control = pl330_control;
758 pd->device_issue_pending = pl330_issue_pending;
759
760 ret = dma_async_device_register(pd);
761 if (ret) {
762 dev_err(&adev->dev, "unable to register DMAC\n");
763 goto probe_err4;
764 }
765
766 amba_set_drvdata(adev, pdmac);
767
768 dev_info(&adev->dev,
769 "Loaded driver for PL330 DMAC-%d\n", adev->periphid);
770 dev_info(&adev->dev,
771 "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n",
772 pi->pcfg.data_buf_dep,
773 pi->pcfg.data_bus_width / 8, pi->pcfg.num_chan,
774 pi->pcfg.num_peri, pi->pcfg.num_events);
775
776 return 0;
777
778probe_err4:
779 pl330_del(pi);
780probe_err3:
781 free_irq(irq, pi);
782probe_err2:
783 iounmap(pi->base);
784probe_err1:
785 release_mem_region(res->start, resource_size(res));
786 kfree(pdmac);
787
788 return ret;
789}
790
791static int __devexit pl330_remove(struct amba_device *adev)
792{
793 struct dma_pl330_dmac *pdmac = amba_get_drvdata(adev);
794 struct dma_pl330_chan *pch, *_p;
795 struct pl330_info *pi;
796 struct resource *res;
797 int irq;
798
799 if (!pdmac)
800 return 0;
801
802 amba_set_drvdata(adev, NULL);
803
804 /* Idle the DMAC */
805 list_for_each_entry_safe(pch, _p, &pdmac->ddma.channels,
806 chan.device_node) {
807
808 /* Remove the channel */
809 list_del(&pch->chan.device_node);
810
811 /* Flush the channel */
812 pl330_control(&pch->chan, DMA_TERMINATE_ALL, 0);
813 pl330_free_chan_resources(&pch->chan);
814 }
815
816 pi = &pdmac->pif;
817
818 pl330_del(pi);
819
820 irq = adev->irq[0];
821 free_irq(irq, pi);
822
823 iounmap(pi->base);
824
825 res = &adev->res;
826 release_mem_region(res->start, resource_size(res));
827
828 kfree(pdmac);
829
830 return 0;
831}
832
833static struct amba_id pl330_ids[] = {
834 {
835 .id = 0x00041330,
836 .mask = 0x000fffff,
837 },
838 { 0, 0 },
839};
840
841static struct amba_driver pl330_driver = {
842 .drv = {
843 .owner = THIS_MODULE,
844 .name = "dma-pl330",
845 },
846 .id_table = pl330_ids,
847 .probe = pl330_probe,
848 .remove = pl330_remove,
849};
850
851static int __init pl330_init(void)
852{
853 return amba_driver_register(&pl330_driver);
854}
855module_init(pl330_init);
856
857static void __exit pl330_exit(void)
858{
859 amba_driver_unregister(&pl330_driver);
860 return;
861}
862module_exit(pl330_exit);
863
864MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>");
865MODULE_DESCRIPTION("API Driver for PL330 DMAC");
866MODULE_LICENSE("GPL");
diff --git a/include/linux/amba/pl330.h b/include/linux/amba/pl330.h
new file mode 100644
index 000000000000..cbee7de7dd36
--- /dev/null
+++ b/include/linux/amba/pl330.h
@@ -0,0 +1,45 @@
1/* linux/include/linux/amba/pl330.h
2 *
3 * Copyright (C) 2010 Samsung Electronics Co. Ltd.
4 * Jaswinder Singh <jassi.brar@samsung.com>
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 as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#ifndef __AMBA_PL330_H_
13#define __AMBA_PL330_H_
14
15#include <asm/hardware/pl330.h>
16
17struct dma_pl330_peri {
18 /*
19 * Peri_Req i/f of the DMAC that is
20 * peripheral could be reached from.
21 */
22 u8 peri_id; /* {0, 31} */
23 enum pl330_reqtype rqtype;
24
25 /* For M->D and D->M Channels */
26 int burst_sz; /* in power of 2 */
27 dma_addr_t fifo_addr;
28};
29
30struct dma_pl330_platdata {
31 /*
32 * Number of valid peripherals connected to DMAC.
33 * This may be different from the value read from
34 * CR0, as the PL330 implementation might have 'holes'
35 * in the peri list or the peri could also be reached
36 * from another DMAC which the platform prefers.
37 */
38 u8 nr_valid_peri;
39 /* Array of valid peripherals */
40 struct dma_pl330_peri *peri;
41 /* Bytes to allocate for MC buffer */
42 unsigned mcbuf_sz;
43};
44
45#endif /* __AMBA_PL330_H_ */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-24 01:28:20 -0500