Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Renesas SuperH DMA Engine support |
| 3 | * |
| 4 | * base is drivers/dma/flsdma.c |
| 5 | * |
| 6 | * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> |
| 7 | * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. |
| 8 | * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. |
| 9 | * |
| 10 | * This is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * - DMA of SuperH does not have Hardware DMA chain mode. |
| 16 | * - MAX DMA size is 16MB. |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 22 | #include <linux/slab.h> |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/dmaengine.h> |
| 25 | #include <linux/delay.h> |
| 26 | #include <linux/dma-mapping.h> |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 27 | #include <linux/platform_device.h> |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 28 | #include <linux/pm_runtime.h> |
Magnus Damm | b2623a6 | 2010-03-19 04:47:10 +0000 | [diff] [blame] | 29 | #include <linux/sh_dma.h> |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 30 | #include <linux/notifier.h> |
| 31 | #include <linux/kdebug.h> |
| 32 | #include <linux/spinlock.h> |
| 33 | #include <linux/rculist.h> |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 34 | #include "shdma.h" |
| 35 | |
| 36 | /* DMA descriptor control */ |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 37 | enum sh_dmae_desc_status { |
| 38 | DESC_IDLE, |
| 39 | DESC_PREPARED, |
| 40 | DESC_SUBMITTED, |
| 41 | DESC_COMPLETED, /* completed, have to call callback */ |
| 42 | DESC_WAITING, /* callback called, waiting for ack / re-submit */ |
| 43 | }; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 44 | |
| 45 | #define NR_DESCS_PER_CHANNEL 32 |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 46 | /* Default MEMCPY transfer size = 2^2 = 4 bytes */ |
| 47 | #define LOG2_DEFAULT_XFER_SIZE 2 |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 48 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 49 | /* |
| 50 | * Used for write-side mutual exclusion for the global device list, |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 51 | * read-side synchronization by way of RCU, and per-controller data. |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 52 | */ |
| 53 | static DEFINE_SPINLOCK(sh_dmae_lock); |
| 54 | static LIST_HEAD(sh_dmae_devices); |
| 55 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 56 | /* A bitmask with bits enough for enum sh_dmae_slave_chan_id */ |
Magnus Damm | 02ca508 | 2010-03-19 04:46:47 +0000 | [diff] [blame] | 57 | static unsigned long sh_dmae_slave_used[BITS_TO_LONGS(SH_DMA_SLAVE_NUMBER)]; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 58 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 59 | static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all); |
| 60 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 61 | static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) |
| 62 | { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 63 | __raw_writel(data, sh_dc->base + reg / sizeof(u32)); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 64 | } |
| 65 | |
| 66 | static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) |
| 67 | { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 68 | return __raw_readl(sh_dc->base + reg / sizeof(u32)); |
| 69 | } |
| 70 | |
| 71 | static u16 dmaor_read(struct sh_dmae_device *shdev) |
| 72 | { |
Kuninori Morimoto | e76c3af | 2011-06-17 08:20:56 +0000 | [diff] [blame] | 73 | u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32); |
| 74 | |
| 75 | if (shdev->pdata->dmaor_is_32bit) |
| 76 | return __raw_readl(addr); |
| 77 | else |
| 78 | return __raw_readw(addr); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | static void dmaor_write(struct sh_dmae_device *shdev, u16 data) |
| 82 | { |
Kuninori Morimoto | e76c3af | 2011-06-17 08:20:56 +0000 | [diff] [blame] | 83 | u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32); |
| 84 | |
| 85 | if (shdev->pdata->dmaor_is_32bit) |
| 86 | __raw_writel(data, addr); |
| 87 | else |
| 88 | __raw_writew(data, addr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 89 | } |
| 90 | |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 91 | static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data) |
| 92 | { |
| 93 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); |
| 94 | |
| 95 | __raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32)); |
| 96 | } |
| 97 | |
| 98 | static u32 chcr_read(struct sh_dmae_chan *sh_dc) |
| 99 | { |
| 100 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); |
| 101 | |
| 102 | return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32)); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 103 | } |
| 104 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 105 | /* |
| 106 | * Reset DMA controller |
| 107 | * |
| 108 | * SH7780 has two DMAOR register |
| 109 | */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 110 | static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 111 | { |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 112 | unsigned short dmaor; |
| 113 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 114 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 115 | spin_lock_irqsave(&sh_dmae_lock, flags); |
| 116 | |
| 117 | dmaor = dmaor_read(shdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 118 | dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME)); |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 119 | |
| 120 | spin_unlock_irqrestore(&sh_dmae_lock, flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 121 | } |
| 122 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 123 | static int sh_dmae_rst(struct sh_dmae_device *shdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 124 | { |
| 125 | unsigned short dmaor; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 126 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 127 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 128 | spin_lock_irqsave(&sh_dmae_lock, flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 129 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 130 | dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME); |
| 131 | |
| 132 | dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init); |
| 133 | |
| 134 | dmaor = dmaor_read(shdev); |
| 135 | |
| 136 | spin_unlock_irqrestore(&sh_dmae_lock, flags); |
| 137 | |
| 138 | if (dmaor & (DMAOR_AE | DMAOR_NMIF)) { |
| 139 | dev_warn(shdev->common.dev, "Can't initialize DMAOR.\n"); |
| 140 | return -EIO; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 141 | } |
| 142 | return 0; |
| 143 | } |
| 144 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 145 | static bool dmae_is_busy(struct sh_dmae_chan *sh_chan) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 146 | { |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 147 | u32 chcr = chcr_read(sh_chan); |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 148 | |
| 149 | if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE) |
| 150 | return true; /* working */ |
| 151 | |
| 152 | return false; /* waiting */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 153 | } |
| 154 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 155 | static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 156 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 157 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 158 | struct sh_dmae_pdata *pdata = shdev->pdata; |
| 159 | int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) | |
| 160 | ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift); |
Guennadi Liakhovetski | 623b4ac | 2010-02-03 14:44:12 +0000 | [diff] [blame] | 161 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 162 | if (cnt >= pdata->ts_shift_num) |
| 163 | cnt = 0; |
| 164 | |
| 165 | return pdata->ts_shift[cnt]; |
| 166 | } |
| 167 | |
| 168 | static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size) |
| 169 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 170 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 171 | struct sh_dmae_pdata *pdata = shdev->pdata; |
| 172 | int i; |
| 173 | |
| 174 | for (i = 0; i < pdata->ts_shift_num; i++) |
| 175 | if (pdata->ts_shift[i] == l2size) |
| 176 | break; |
| 177 | |
| 178 | if (i == pdata->ts_shift_num) |
| 179 | i = 0; |
| 180 | |
| 181 | return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) | |
| 182 | ((i << pdata->ts_high_shift) & pdata->ts_high_mask); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 183 | } |
| 184 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 185 | static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 186 | { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 187 | sh_dmae_writel(sh_chan, hw->sar, SAR); |
| 188 | sh_dmae_writel(sh_chan, hw->dar, DAR); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 189 | sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | static void dmae_start(struct sh_dmae_chan *sh_chan) |
| 193 | { |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 194 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 195 | u32 chcr = chcr_read(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 196 | |
Kuninori Morimoto | 260bf2c | 2011-06-17 08:21:05 +0000 | [diff] [blame] | 197 | if (shdev->pdata->needs_tend_set) |
| 198 | sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND); |
| 199 | |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 200 | chcr |= CHCR_DE | shdev->chcr_ie_bit; |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 201 | chcr_write(sh_chan, chcr & ~CHCR_TE); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 202 | } |
| 203 | |
| 204 | static void dmae_halt(struct sh_dmae_chan *sh_chan) |
| 205 | { |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 206 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 207 | u32 chcr = chcr_read(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 208 | |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 209 | chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 210 | chcr_write(sh_chan, chcr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 211 | } |
| 212 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 213 | static void dmae_init(struct sh_dmae_chan *sh_chan) |
| 214 | { |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 215 | /* |
| 216 | * Default configuration for dual address memory-memory transfer. |
| 217 | * 0x400 represents auto-request. |
| 218 | */ |
| 219 | u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan, |
| 220 | LOG2_DEFAULT_XFER_SIZE); |
| 221 | sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 222 | chcr_write(sh_chan, chcr); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 223 | } |
| 224 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 225 | static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) |
| 226 | { |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 227 | /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */ |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 228 | if (dmae_is_busy(sh_chan)) |
| 229 | return -EBUSY; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 230 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 231 | sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 232 | chcr_write(sh_chan, val); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 233 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 234 | return 0; |
| 235 | } |
| 236 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 237 | static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) |
| 238 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 239 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 240 | struct sh_dmae_pdata *pdata = shdev->pdata; |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 241 | const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id]; |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 242 | u16 __iomem *addr = shdev->dmars; |
Kuninori Morimoto | 090b918 | 2011-06-16 05:08:28 +0000 | [diff] [blame] | 243 | unsigned int shift = chan_pdata->dmars_bit; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 244 | |
| 245 | if (dmae_is_busy(sh_chan)) |
| 246 | return -EBUSY; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 247 | |
Kuninori Morimoto | 260bf2c | 2011-06-17 08:21:05 +0000 | [diff] [blame] | 248 | if (pdata->no_dmars) |
| 249 | return 0; |
| 250 | |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 251 | /* in the case of a missing DMARS resource use first memory window */ |
| 252 | if (!addr) |
| 253 | addr = (u16 __iomem *)shdev->chan_reg; |
| 254 | addr += chan_pdata->dmars / sizeof(u16); |
| 255 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 256 | __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift), |
| 257 | addr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 258 | |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx) |
| 263 | { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 264 | struct sh_desc *desc = tx_to_sh_desc(tx), *chunk, *last = desc, *c; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 265 | struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 266 | dma_async_tx_callback callback = tx->callback; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 267 | dma_cookie_t cookie; |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 268 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 269 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 270 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 271 | |
| 272 | cookie = sh_chan->common.cookie; |
| 273 | cookie++; |
| 274 | if (cookie < 0) |
| 275 | cookie = 1; |
| 276 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 277 | sh_chan->common.cookie = cookie; |
| 278 | tx->cookie = cookie; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 279 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 280 | /* Mark all chunks of this descriptor as submitted, move to the queue */ |
| 281 | list_for_each_entry_safe(chunk, c, desc->node.prev, node) { |
| 282 | /* |
| 283 | * All chunks are on the global ld_free, so, we have to find |
| 284 | * the end of the chain ourselves |
| 285 | */ |
| 286 | if (chunk != desc && (chunk->mark == DESC_IDLE || |
| 287 | chunk->async_tx.cookie > 0 || |
| 288 | chunk->async_tx.cookie == -EBUSY || |
| 289 | &chunk->node == &sh_chan->ld_free)) |
| 290 | break; |
| 291 | chunk->mark = DESC_SUBMITTED; |
| 292 | /* Callback goes to the last chunk */ |
| 293 | chunk->async_tx.callback = NULL; |
| 294 | chunk->cookie = cookie; |
| 295 | list_move_tail(&chunk->node, &sh_chan->ld_queue); |
| 296 | last = chunk; |
| 297 | } |
| 298 | |
| 299 | last->async_tx.callback = callback; |
| 300 | last->async_tx.callback_param = tx->callback_param; |
| 301 | |
| 302 | dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n", |
| 303 | tx->cookie, &last->async_tx, sh_chan->id, |
| 304 | desc->hw.sar, desc->hw.tcr, desc->hw.dar); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 305 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 306 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 307 | |
| 308 | return cookie; |
| 309 | } |
| 310 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 311 | /* Called with desc_lock held */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 312 | static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan) |
| 313 | { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 314 | struct sh_desc *desc; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 315 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 316 | list_for_each_entry(desc, &sh_chan->ld_free, node) |
| 317 | if (desc->mark != DESC_PREPARED) { |
| 318 | BUG_ON(desc->mark != DESC_IDLE); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 319 | list_del(&desc->node); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 320 | return desc; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 321 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 322 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 323 | return NULL; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 324 | } |
| 325 | |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 326 | static const struct sh_dmae_slave_config *sh_dmae_find_slave( |
Magnus Damm | 4bab9d4 | 2010-03-19 04:46:38 +0000 | [diff] [blame] | 327 | struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param) |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 328 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 329 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 330 | struct sh_dmae_pdata *pdata = shdev->pdata; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 331 | int i; |
| 332 | |
Magnus Damm | 02ca508 | 2010-03-19 04:46:47 +0000 | [diff] [blame] | 333 | if (param->slave_id >= SH_DMA_SLAVE_NUMBER) |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 334 | return NULL; |
| 335 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 336 | for (i = 0; i < pdata->slave_num; i++) |
Magnus Damm | 4bab9d4 | 2010-03-19 04:46:38 +0000 | [diff] [blame] | 337 | if (pdata->slave[i].slave_id == param->slave_id) |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 338 | return pdata->slave + i; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 339 | |
| 340 | return NULL; |
| 341 | } |
| 342 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 343 | static int sh_dmae_alloc_chan_resources(struct dma_chan *chan) |
| 344 | { |
| 345 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
| 346 | struct sh_desc *desc; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 347 | struct sh_dmae_slave *param = chan->private; |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 348 | int ret; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 349 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 350 | pm_runtime_get_sync(sh_chan->dev); |
| 351 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 352 | /* |
| 353 | * This relies on the guarantee from dmaengine that alloc_chan_resources |
| 354 | * never runs concurrently with itself or free_chan_resources. |
| 355 | */ |
| 356 | if (param) { |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 357 | const struct sh_dmae_slave_config *cfg; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 358 | |
Magnus Damm | 4bab9d4 | 2010-03-19 04:46:38 +0000 | [diff] [blame] | 359 | cfg = sh_dmae_find_slave(sh_chan, param); |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 360 | if (!cfg) { |
| 361 | ret = -EINVAL; |
| 362 | goto efindslave; |
| 363 | } |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 364 | |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 365 | if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) { |
| 366 | ret = -EBUSY; |
| 367 | goto etestused; |
| 368 | } |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 369 | |
| 370 | param->config = cfg; |
| 371 | |
| 372 | dmae_set_dmars(sh_chan, cfg->mid_rid); |
| 373 | dmae_set_chcr(sh_chan, cfg->chcr); |
Guennadi Liakhovetski | a1b2cc5 | 2011-05-31 09:25:16 +0000 | [diff] [blame] | 374 | } else { |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 375 | dmae_init(sh_chan); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 376 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 377 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 378 | while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) { |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 379 | desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL); |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 380 | if (!desc) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 381 | break; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 382 | dma_async_tx_descriptor_init(&desc->async_tx, |
| 383 | &sh_chan->common); |
| 384 | desc->async_tx.tx_submit = sh_dmae_tx_submit; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 385 | desc->mark = DESC_IDLE; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 386 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 387 | list_add(&desc->node, &sh_chan->ld_free); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 388 | sh_chan->descs_allocated++; |
| 389 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 390 | |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 391 | if (!sh_chan->descs_allocated) { |
| 392 | ret = -ENOMEM; |
| 393 | goto edescalloc; |
| 394 | } |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 395 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 396 | return sh_chan->descs_allocated; |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 397 | |
| 398 | edescalloc: |
| 399 | if (param) |
| 400 | clear_bit(param->slave_id, sh_dmae_slave_used); |
| 401 | etestused: |
| 402 | efindslave: |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 403 | chan->private = NULL; |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 404 | pm_runtime_put(sh_chan->dev); |
| 405 | return ret; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | /* |
| 409 | * sh_dma_free_chan_resources - Free all resources of the channel. |
| 410 | */ |
| 411 | static void sh_dmae_free_chan_resources(struct dma_chan *chan) |
| 412 | { |
| 413 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
| 414 | struct sh_desc *desc, *_desc; |
| 415 | LIST_HEAD(list); |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 416 | int descs = sh_chan->descs_allocated; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 417 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 418 | /* Protect against ISR */ |
| 419 | spin_lock_irq(&sh_chan->desc_lock); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 420 | dmae_halt(sh_chan); |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 421 | spin_unlock_irq(&sh_chan->desc_lock); |
| 422 | |
| 423 | /* Now no new interrupts will occur */ |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 424 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 425 | /* Prepared and not submitted descriptors can still be on the queue */ |
| 426 | if (!list_empty(&sh_chan->ld_queue)) |
| 427 | sh_dmae_chan_ld_cleanup(sh_chan, true); |
| 428 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 429 | if (chan->private) { |
| 430 | /* The caller is holding dma_list_mutex */ |
| 431 | struct sh_dmae_slave *param = chan->private; |
| 432 | clear_bit(param->slave_id, sh_dmae_slave_used); |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 433 | chan->private = NULL; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 434 | } |
| 435 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 436 | spin_lock_irq(&sh_chan->desc_lock); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 437 | |
| 438 | list_splice_init(&sh_chan->ld_free, &list); |
| 439 | sh_chan->descs_allocated = 0; |
| 440 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 441 | spin_unlock_irq(&sh_chan->desc_lock); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 442 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 443 | if (descs > 0) |
| 444 | pm_runtime_put(sh_chan->dev); |
| 445 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 446 | list_for_each_entry_safe(desc, _desc, &list, node) |
| 447 | kfree(desc); |
| 448 | } |
| 449 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 450 | /** |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 451 | * sh_dmae_add_desc - get, set up and return one transfer descriptor |
| 452 | * @sh_chan: DMA channel |
| 453 | * @flags: DMA transfer flags |
| 454 | * @dest: destination DMA address, incremented when direction equals |
| 455 | * DMA_FROM_DEVICE or DMA_BIDIRECTIONAL |
| 456 | * @src: source DMA address, incremented when direction equals |
| 457 | * DMA_TO_DEVICE or DMA_BIDIRECTIONAL |
| 458 | * @len: DMA transfer length |
| 459 | * @first: if NULL, set to the current descriptor and cookie set to -EBUSY |
| 460 | * @direction: needed for slave DMA to decide which address to keep constant, |
| 461 | * equals DMA_BIDIRECTIONAL for MEMCPY |
| 462 | * Returns 0 or an error |
| 463 | * Locks: called with desc_lock held |
| 464 | */ |
| 465 | static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan, |
| 466 | unsigned long flags, dma_addr_t *dest, dma_addr_t *src, size_t *len, |
| 467 | struct sh_desc **first, enum dma_data_direction direction) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 468 | { |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 469 | struct sh_desc *new; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 470 | size_t copy_size; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 471 | |
| 472 | if (!*len) |
| 473 | return NULL; |
| 474 | |
| 475 | /* Allocate the link descriptor from the free list */ |
| 476 | new = sh_dmae_get_desc(sh_chan); |
| 477 | if (!new) { |
| 478 | dev_err(sh_chan->dev, "No free link descriptor available\n"); |
| 479 | return NULL; |
| 480 | } |
| 481 | |
| 482 | copy_size = min(*len, (size_t)SH_DMA_TCR_MAX + 1); |
| 483 | |
| 484 | new->hw.sar = *src; |
| 485 | new->hw.dar = *dest; |
| 486 | new->hw.tcr = copy_size; |
| 487 | |
| 488 | if (!*first) { |
| 489 | /* First desc */ |
| 490 | new->async_tx.cookie = -EBUSY; |
| 491 | *first = new; |
| 492 | } else { |
| 493 | /* Other desc - invisible to the user */ |
| 494 | new->async_tx.cookie = -EINVAL; |
| 495 | } |
| 496 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 497 | dev_dbg(sh_chan->dev, |
| 498 | "chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n", |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 499 | copy_size, *len, *src, *dest, &new->async_tx, |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 500 | new->async_tx.cookie, sh_chan->xmit_shift); |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 501 | |
| 502 | new->mark = DESC_PREPARED; |
| 503 | new->async_tx.flags = flags; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 504 | new->direction = direction; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 505 | |
| 506 | *len -= copy_size; |
| 507 | if (direction == DMA_BIDIRECTIONAL || direction == DMA_TO_DEVICE) |
| 508 | *src += copy_size; |
| 509 | if (direction == DMA_BIDIRECTIONAL || direction == DMA_FROM_DEVICE) |
| 510 | *dest += copy_size; |
| 511 | |
| 512 | return new; |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | * sh_dmae_prep_sg - prepare transfer descriptors from an SG list |
| 517 | * |
| 518 | * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also |
| 519 | * converted to scatter-gather to guarantee consistent locking and a correct |
| 520 | * list manipulation. For slave DMA direction carries the usual meaning, and, |
| 521 | * logically, the SG list is RAM and the addr variable contains slave address, |
| 522 | * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_BIDIRECTIONAL |
| 523 | * and the SG list contains only one element and points at the source buffer. |
| 524 | */ |
| 525 | static struct dma_async_tx_descriptor *sh_dmae_prep_sg(struct sh_dmae_chan *sh_chan, |
| 526 | struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr, |
| 527 | enum dma_data_direction direction, unsigned long flags) |
| 528 | { |
| 529 | struct scatterlist *sg; |
| 530 | struct sh_desc *first = NULL, *new = NULL /* compiler... */; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 531 | LIST_HEAD(tx_list); |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 532 | int chunks = 0; |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 533 | unsigned long irq_flags; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 534 | int i; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 535 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 536 | if (!sg_len) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 537 | return NULL; |
| 538 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 539 | for_each_sg(sgl, sg, sg_len, i) |
| 540 | chunks += (sg_dma_len(sg) + SH_DMA_TCR_MAX) / |
| 541 | (SH_DMA_TCR_MAX + 1); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 542 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 543 | /* Have to lock the whole loop to protect against concurrent release */ |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 544 | spin_lock_irqsave(&sh_chan->desc_lock, irq_flags); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 545 | |
| 546 | /* |
| 547 | * Chaining: |
| 548 | * first descriptor is what user is dealing with in all API calls, its |
| 549 | * cookie is at first set to -EBUSY, at tx-submit to a positive |
| 550 | * number |
| 551 | * if more than one chunk is needed further chunks have cookie = -EINVAL |
| 552 | * the last chunk, if not equal to the first, has cookie = -ENOSPC |
| 553 | * all chunks are linked onto the tx_list head with their .node heads |
| 554 | * only during this function, then they are immediately spliced |
| 555 | * back onto the free list in form of a chain |
| 556 | */ |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 557 | for_each_sg(sgl, sg, sg_len, i) { |
| 558 | dma_addr_t sg_addr = sg_dma_address(sg); |
| 559 | size_t len = sg_dma_len(sg); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 560 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 561 | if (!len) |
| 562 | goto err_get_desc; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 563 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 564 | do { |
| 565 | dev_dbg(sh_chan->dev, "Add SG #%d@%p[%d], dma %llx\n", |
| 566 | i, sg, len, (unsigned long long)sg_addr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 567 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 568 | if (direction == DMA_FROM_DEVICE) |
| 569 | new = sh_dmae_add_desc(sh_chan, flags, |
| 570 | &sg_addr, addr, &len, &first, |
| 571 | direction); |
| 572 | else |
| 573 | new = sh_dmae_add_desc(sh_chan, flags, |
| 574 | addr, &sg_addr, &len, &first, |
| 575 | direction); |
| 576 | if (!new) |
| 577 | goto err_get_desc; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 578 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 579 | new->chunks = chunks--; |
| 580 | list_add_tail(&new->node, &tx_list); |
| 581 | } while (len); |
| 582 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 583 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 584 | if (new != first) |
| 585 | new->async_tx.cookie = -ENOSPC; |
| 586 | |
| 587 | /* Put them back on the free list, so, they don't get lost */ |
| 588 | list_splice_tail(&tx_list, &sh_chan->ld_free); |
| 589 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 590 | spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 591 | |
| 592 | return &first->async_tx; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 593 | |
| 594 | err_get_desc: |
| 595 | list_for_each_entry(new, &tx_list, node) |
| 596 | new->mark = DESC_IDLE; |
| 597 | list_splice(&tx_list, &sh_chan->ld_free); |
| 598 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 599 | spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags); |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 600 | |
| 601 | return NULL; |
| 602 | } |
| 603 | |
| 604 | static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy( |
| 605 | struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, |
| 606 | size_t len, unsigned long flags) |
| 607 | { |
| 608 | struct sh_dmae_chan *sh_chan; |
| 609 | struct scatterlist sg; |
| 610 | |
| 611 | if (!chan || !len) |
| 612 | return NULL; |
| 613 | |
| 614 | sh_chan = to_sh_chan(chan); |
| 615 | |
| 616 | sg_init_table(&sg, 1); |
| 617 | sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len, |
| 618 | offset_in_page(dma_src)); |
| 619 | sg_dma_address(&sg) = dma_src; |
| 620 | sg_dma_len(&sg) = len; |
| 621 | |
| 622 | return sh_dmae_prep_sg(sh_chan, &sg, 1, &dma_dest, DMA_BIDIRECTIONAL, |
| 623 | flags); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 624 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 625 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 626 | static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg( |
| 627 | struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, |
| 628 | enum dma_data_direction direction, unsigned long flags) |
| 629 | { |
| 630 | struct sh_dmae_slave *param; |
| 631 | struct sh_dmae_chan *sh_chan; |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 632 | dma_addr_t slave_addr; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 633 | |
| 634 | if (!chan) |
| 635 | return NULL; |
| 636 | |
| 637 | sh_chan = to_sh_chan(chan); |
| 638 | param = chan->private; |
| 639 | |
| 640 | /* Someone calling slave DMA on a public channel? */ |
| 641 | if (!param || !sg_len) { |
| 642 | dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n", |
| 643 | __func__, param, sg_len, param ? param->slave_id : -1); |
| 644 | return NULL; |
| 645 | } |
| 646 | |
Dan Carpenter | 9f9ff20 | 2010-08-14 11:01:45 +0200 | [diff] [blame] | 647 | slave_addr = param->config->addr; |
| 648 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 649 | /* |
| 650 | * if (param != NULL), this is a successfully requested slave channel, |
| 651 | * therefore param->config != NULL too. |
| 652 | */ |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 653 | return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &slave_addr, |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 654 | direction, flags); |
| 655 | } |
| 656 | |
Linus Walleij | 0582763 | 2010-05-17 16:30:42 -0700 | [diff] [blame] | 657 | static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
| 658 | unsigned long arg) |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 659 | { |
| 660 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 661 | unsigned long flags; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 662 | |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 663 | /* Only supports DMA_TERMINATE_ALL */ |
| 664 | if (cmd != DMA_TERMINATE_ALL) |
| 665 | return -ENXIO; |
| 666 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 667 | if (!chan) |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 668 | return -EINVAL; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 669 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 670 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | c014906 | 2010-02-18 16:30:02 +0000 | [diff] [blame] | 671 | dmae_halt(sh_chan); |
| 672 | |
Guennadi Liakhovetski | c014906 | 2010-02-18 16:30:02 +0000 | [diff] [blame] | 673 | if (!list_empty(&sh_chan->ld_queue)) { |
| 674 | /* Record partial transfer */ |
| 675 | struct sh_desc *desc = list_entry(sh_chan->ld_queue.next, |
| 676 | struct sh_desc, node); |
| 677 | desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) << |
| 678 | sh_chan->xmit_shift; |
| 679 | |
| 680 | } |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 681 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | c014906 | 2010-02-18 16:30:02 +0000 | [diff] [blame] | 682 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 683 | sh_dmae_chan_ld_cleanup(sh_chan, true); |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 684 | |
| 685 | return 0; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 686 | } |
| 687 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 688 | static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all) |
| 689 | { |
| 690 | struct sh_desc *desc, *_desc; |
| 691 | /* Is the "exposed" head of a chain acked? */ |
| 692 | bool head_acked = false; |
| 693 | dma_cookie_t cookie = 0; |
| 694 | dma_async_tx_callback callback = NULL; |
| 695 | void *param = NULL; |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 696 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 697 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 698 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 699 | list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) { |
| 700 | struct dma_async_tx_descriptor *tx = &desc->async_tx; |
| 701 | |
| 702 | BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie); |
| 703 | BUG_ON(desc->mark != DESC_SUBMITTED && |
| 704 | desc->mark != DESC_COMPLETED && |
| 705 | desc->mark != DESC_WAITING); |
| 706 | |
| 707 | /* |
| 708 | * queue is ordered, and we use this loop to (1) clean up all |
| 709 | * completed descriptors, and to (2) update descriptor flags of |
| 710 | * any chunks in a (partially) completed chain |
| 711 | */ |
| 712 | if (!all && desc->mark == DESC_SUBMITTED && |
| 713 | desc->cookie != cookie) |
| 714 | break; |
| 715 | |
| 716 | if (tx->cookie > 0) |
| 717 | cookie = tx->cookie; |
| 718 | |
| 719 | if (desc->mark == DESC_COMPLETED && desc->chunks == 1) { |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 720 | if (sh_chan->completed_cookie != desc->cookie - 1) |
| 721 | dev_dbg(sh_chan->dev, |
| 722 | "Completing cookie %d, expected %d\n", |
| 723 | desc->cookie, |
| 724 | sh_chan->completed_cookie + 1); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 725 | sh_chan->completed_cookie = desc->cookie; |
| 726 | } |
| 727 | |
| 728 | /* Call callback on the last chunk */ |
| 729 | if (desc->mark == DESC_COMPLETED && tx->callback) { |
| 730 | desc->mark = DESC_WAITING; |
| 731 | callback = tx->callback; |
| 732 | param = tx->callback_param; |
| 733 | dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n", |
| 734 | tx->cookie, tx, sh_chan->id); |
| 735 | BUG_ON(desc->chunks != 1); |
| 736 | break; |
| 737 | } |
| 738 | |
| 739 | if (tx->cookie > 0 || tx->cookie == -EBUSY) { |
| 740 | if (desc->mark == DESC_COMPLETED) { |
| 741 | BUG_ON(tx->cookie < 0); |
| 742 | desc->mark = DESC_WAITING; |
| 743 | } |
| 744 | head_acked = async_tx_test_ack(tx); |
| 745 | } else { |
| 746 | switch (desc->mark) { |
| 747 | case DESC_COMPLETED: |
| 748 | desc->mark = DESC_WAITING; |
| 749 | /* Fall through */ |
| 750 | case DESC_WAITING: |
| 751 | if (head_acked) |
| 752 | async_tx_ack(&desc->async_tx); |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n", |
| 757 | tx, tx->cookie); |
| 758 | |
| 759 | if (((desc->mark == DESC_COMPLETED || |
| 760 | desc->mark == DESC_WAITING) && |
| 761 | async_tx_test_ack(&desc->async_tx)) || all) { |
| 762 | /* Remove from ld_queue list */ |
| 763 | desc->mark = DESC_IDLE; |
| 764 | list_move(&desc->node, &sh_chan->ld_free); |
| 765 | } |
| 766 | } |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 767 | |
| 768 | if (all && !callback) |
| 769 | /* |
| 770 | * Terminating and the loop completed normally: forgive |
| 771 | * uncompleted cookies |
| 772 | */ |
| 773 | sh_chan->completed_cookie = sh_chan->common.cookie; |
| 774 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 775 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 776 | |
| 777 | if (callback) |
| 778 | callback(param); |
| 779 | |
| 780 | return callback; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 781 | } |
| 782 | |
| 783 | /* |
| 784 | * sh_chan_ld_cleanup - Clean up link descriptors |
| 785 | * |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 786 | * This function cleans up the ld_queue of DMA channel. |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 787 | */ |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 788 | static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 789 | { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 790 | while (__ld_cleanup(sh_chan, all)) |
| 791 | ; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan) |
| 795 | { |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 796 | struct sh_desc *desc; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 797 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 798 | spin_lock_irq(&sh_chan->desc_lock); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 799 | /* DMA work check */ |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 800 | if (dmae_is_busy(sh_chan)) { |
| 801 | spin_unlock_irq(&sh_chan->desc_lock); |
| 802 | return; |
| 803 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 804 | |
Justin P. Mattock | 5a3a7658 | 2011-01-19 15:36:38 +0100 | [diff] [blame] | 805 | /* Find the first not transferred descriptor */ |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 806 | list_for_each_entry(desc, &sh_chan->ld_queue, node) |
| 807 | if (desc->mark == DESC_SUBMITTED) { |
Guennadi Liakhovetski | c014906 | 2010-02-18 16:30:02 +0000 | [diff] [blame] | 808 | dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n", |
| 809 | desc->async_tx.cookie, sh_chan->id, |
| 810 | desc->hw.tcr, desc->hw.sar, desc->hw.dar); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 811 | /* Get the ld start address from ld_queue */ |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 812 | dmae_set_reg(sh_chan, &desc->hw); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 813 | dmae_start(sh_chan); |
| 814 | break; |
| 815 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 816 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 817 | spin_unlock_irq(&sh_chan->desc_lock); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 818 | } |
| 819 | |
| 820 | static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan) |
| 821 | { |
| 822 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
| 823 | sh_chan_xfer_ld_queue(sh_chan); |
| 824 | } |
| 825 | |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 826 | static enum dma_status sh_dmae_tx_status(struct dma_chan *chan, |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 827 | dma_cookie_t cookie, |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 828 | struct dma_tx_state *txstate) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 829 | { |
| 830 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
| 831 | dma_cookie_t last_used; |
| 832 | dma_cookie_t last_complete; |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 833 | enum dma_status status; |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 834 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 835 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 836 | sh_dmae_chan_ld_cleanup(sh_chan, false); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 837 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 838 | /* First read completed cookie to avoid a skew */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 839 | last_complete = sh_chan->completed_cookie; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 840 | rmb(); |
| 841 | last_used = chan->cookie; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 842 | BUG_ON(last_complete < 0); |
Dan Williams | bca3469 | 2010-03-26 16:52:10 -0700 | [diff] [blame] | 843 | dma_set_tx_state(txstate, last_complete, last_used, 0); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 844 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 845 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 846 | |
| 847 | status = dma_async_is_complete(cookie, last_complete, last_used); |
| 848 | |
| 849 | /* |
| 850 | * If we don't find cookie on the queue, it has been aborted and we have |
| 851 | * to report error |
| 852 | */ |
| 853 | if (status != DMA_SUCCESS) { |
| 854 | struct sh_desc *desc; |
| 855 | status = DMA_ERROR; |
| 856 | list_for_each_entry(desc, &sh_chan->ld_queue, node) |
| 857 | if (desc->cookie == cookie) { |
| 858 | status = DMA_IN_PROGRESS; |
| 859 | break; |
| 860 | } |
| 861 | } |
| 862 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 863 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 864 | |
| 865 | return status; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 866 | } |
| 867 | |
| 868 | static irqreturn_t sh_dmae_interrupt(int irq, void *data) |
| 869 | { |
| 870 | irqreturn_t ret = IRQ_NONE; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 871 | struct sh_dmae_chan *sh_chan = data; |
| 872 | u32 chcr; |
| 873 | |
| 874 | spin_lock(&sh_chan->desc_lock); |
| 875 | |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 876 | chcr = chcr_read(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 877 | |
| 878 | if (chcr & CHCR_TE) { |
| 879 | /* DMA stop */ |
| 880 | dmae_halt(sh_chan); |
| 881 | |
| 882 | ret = IRQ_HANDLED; |
| 883 | tasklet_schedule(&sh_chan->tasklet); |
| 884 | } |
| 885 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 886 | spin_unlock(&sh_chan->desc_lock); |
| 887 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 888 | return ret; |
| 889 | } |
| 890 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 891 | /* Called from error IRQ or NMI */ |
| 892 | static bool sh_dmae_reset(struct sh_dmae_device *shdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 893 | { |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 894 | unsigned int handled = 0; |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 895 | int i; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 896 | |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 897 | /* halt the dma controller */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 898 | sh_dmae_ctl_stop(shdev); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 899 | |
| 900 | /* We cannot detect, which channel caused the error, have to reset all */ |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 901 | for (i = 0; i < SH_DMAC_MAX_CHANNELS; i++) { |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 902 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 903 | struct sh_desc *desc; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 904 | LIST_HEAD(dl); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 905 | |
| 906 | if (!sh_chan) |
| 907 | continue; |
| 908 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 909 | spin_lock(&sh_chan->desc_lock); |
| 910 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 911 | /* Stop the channel */ |
| 912 | dmae_halt(sh_chan); |
| 913 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 914 | list_splice_init(&sh_chan->ld_queue, &dl); |
| 915 | |
| 916 | spin_unlock(&sh_chan->desc_lock); |
| 917 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 918 | /* Complete all */ |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 919 | list_for_each_entry(desc, &dl, node) { |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 920 | struct dma_async_tx_descriptor *tx = &desc->async_tx; |
| 921 | desc->mark = DESC_IDLE; |
| 922 | if (tx->callback) |
| 923 | tx->callback(tx->callback_param); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 924 | } |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 925 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 926 | spin_lock(&sh_chan->desc_lock); |
| 927 | list_splice(&dl, &sh_chan->ld_free); |
| 928 | spin_unlock(&sh_chan->desc_lock); |
| 929 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 930 | handled++; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 931 | } |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 932 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 933 | sh_dmae_rst(shdev); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 934 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 935 | return !!handled; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 936 | } |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 937 | |
| 938 | static irqreturn_t sh_dmae_err(int irq, void *data) |
| 939 | { |
Yoshihiro Shimoda | ff7690b | 2011-02-09 07:46:47 +0000 | [diff] [blame] | 940 | struct sh_dmae_device *shdev = data; |
| 941 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 942 | if (!(dmaor_read(shdev) & DMAOR_AE)) |
Yoshihiro Shimoda | ff7690b | 2011-02-09 07:46:47 +0000 | [diff] [blame] | 943 | return IRQ_NONE; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 944 | |
| 945 | sh_dmae_reset(data); |
| 946 | return IRQ_HANDLED; |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 947 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 948 | |
| 949 | static void dmae_do_tasklet(unsigned long data) |
| 950 | { |
| 951 | struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 952 | struct sh_desc *desc; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 953 | u32 sar_buf = sh_dmae_readl(sh_chan, SAR); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 954 | u32 dar_buf = sh_dmae_readl(sh_chan, DAR); |
Guennadi Liakhovetski | 86d61b3 | 2009-12-10 18:35:07 +0100 | [diff] [blame] | 955 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 956 | spin_lock_irq(&sh_chan->desc_lock); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 957 | list_for_each_entry(desc, &sh_chan->ld_queue, node) { |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 958 | if (desc->mark == DESC_SUBMITTED && |
| 959 | ((desc->direction == DMA_FROM_DEVICE && |
| 960 | (desc->hw.dar + desc->hw.tcr) == dar_buf) || |
| 961 | (desc->hw.sar + desc->hw.tcr) == sar_buf)) { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 962 | dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n", |
| 963 | desc->async_tx.cookie, &desc->async_tx, |
| 964 | desc->hw.dar); |
| 965 | desc->mark = DESC_COMPLETED; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 966 | break; |
| 967 | } |
| 968 | } |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame^] | 969 | spin_unlock_irq(&sh_chan->desc_lock); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 970 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 971 | /* Next desc */ |
| 972 | sh_chan_xfer_ld_queue(sh_chan); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 973 | sh_dmae_chan_ld_cleanup(sh_chan, false); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 974 | } |
| 975 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 976 | static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev) |
| 977 | { |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 978 | /* Fast path out if NMIF is not asserted for this controller */ |
| 979 | if ((dmaor_read(shdev) & DMAOR_NMIF) == 0) |
| 980 | return false; |
| 981 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 982 | return sh_dmae_reset(shdev); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 983 | } |
| 984 | |
| 985 | static int sh_dmae_nmi_handler(struct notifier_block *self, |
| 986 | unsigned long cmd, void *data) |
| 987 | { |
| 988 | struct sh_dmae_device *shdev; |
| 989 | int ret = NOTIFY_DONE; |
| 990 | bool triggered; |
| 991 | |
| 992 | /* |
| 993 | * Only concern ourselves with NMI events. |
| 994 | * |
| 995 | * Normally we would check the die chain value, but as this needs |
| 996 | * to be architecture independent, check for NMI context instead. |
| 997 | */ |
| 998 | if (!in_nmi()) |
| 999 | return NOTIFY_DONE; |
| 1000 | |
| 1001 | rcu_read_lock(); |
| 1002 | list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) { |
| 1003 | /* |
| 1004 | * Only stop if one of the controllers has NMIF asserted, |
| 1005 | * we do not want to interfere with regular address error |
| 1006 | * handling or NMI events that don't concern the DMACs. |
| 1007 | */ |
| 1008 | triggered = sh_dmae_nmi_notify(shdev); |
| 1009 | if (triggered == true) |
| 1010 | ret = NOTIFY_OK; |
| 1011 | } |
| 1012 | rcu_read_unlock(); |
| 1013 | |
| 1014 | return ret; |
| 1015 | } |
| 1016 | |
| 1017 | static struct notifier_block sh_dmae_nmi_notifier __read_mostly = { |
| 1018 | .notifier_call = sh_dmae_nmi_handler, |
| 1019 | |
| 1020 | /* Run before NMI debug handler and KGDB */ |
| 1021 | .priority = 1, |
| 1022 | }; |
| 1023 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1024 | static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id, |
| 1025 | int irq, unsigned long flags) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1026 | { |
| 1027 | int err; |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 1028 | const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id]; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1029 | struct platform_device *pdev = to_platform_device(shdev->common.dev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1030 | struct sh_dmae_chan *new_sh_chan; |
| 1031 | |
| 1032 | /* alloc channel */ |
| 1033 | new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL); |
| 1034 | if (!new_sh_chan) { |
Guennadi Liakhovetski | 86d61b3 | 2009-12-10 18:35:07 +0100 | [diff] [blame] | 1035 | dev_err(shdev->common.dev, |
| 1036 | "No free memory for allocating dma channels!\n"); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1037 | return -ENOMEM; |
| 1038 | } |
| 1039 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 1040 | /* copy struct dma_device */ |
| 1041 | new_sh_chan->common.device = &shdev->common; |
| 1042 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1043 | new_sh_chan->dev = shdev->common.dev; |
| 1044 | new_sh_chan->id = id; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1045 | new_sh_chan->irq = irq; |
| 1046 | new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1047 | |
| 1048 | /* Init DMA tasklet */ |
| 1049 | tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet, |
| 1050 | (unsigned long)new_sh_chan); |
| 1051 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1052 | spin_lock_init(&new_sh_chan->desc_lock); |
| 1053 | |
| 1054 | /* Init descripter manage list */ |
| 1055 | INIT_LIST_HEAD(&new_sh_chan->ld_queue); |
| 1056 | INIT_LIST_HEAD(&new_sh_chan->ld_free); |
| 1057 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1058 | /* Add the channel to DMA device channel list */ |
| 1059 | list_add_tail(&new_sh_chan->common.device_node, |
| 1060 | &shdev->common.channels); |
| 1061 | shdev->common.chancnt++; |
| 1062 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1063 | if (pdev->id >= 0) |
| 1064 | snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id), |
| 1065 | "sh-dmae%d.%d", pdev->id, new_sh_chan->id); |
| 1066 | else |
| 1067 | snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id), |
| 1068 | "sh-dma%d", new_sh_chan->id); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1069 | |
| 1070 | /* set up channel irq */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1071 | err = request_irq(irq, &sh_dmae_interrupt, flags, |
Guennadi Liakhovetski | 86d61b3 | 2009-12-10 18:35:07 +0100 | [diff] [blame] | 1072 | new_sh_chan->dev_id, new_sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1073 | if (err) { |
| 1074 | dev_err(shdev->common.dev, "DMA channel %d request_irq error " |
| 1075 | "with return %d\n", id, err); |
| 1076 | goto err_no_irq; |
| 1077 | } |
| 1078 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1079 | shdev->chan[id] = new_sh_chan; |
| 1080 | return 0; |
| 1081 | |
| 1082 | err_no_irq: |
| 1083 | /* remove from dmaengine device node */ |
| 1084 | list_del(&new_sh_chan->common.device_node); |
| 1085 | kfree(new_sh_chan); |
| 1086 | return err; |
| 1087 | } |
| 1088 | |
| 1089 | static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) |
| 1090 | { |
| 1091 | int i; |
| 1092 | |
| 1093 | for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) { |
| 1094 | if (shdev->chan[i]) { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1095 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1096 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1097 | free_irq(sh_chan->irq, sh_chan); |
| 1098 | |
| 1099 | list_del(&sh_chan->common.device_node); |
| 1100 | kfree(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1101 | shdev->chan[i] = NULL; |
| 1102 | } |
| 1103 | } |
| 1104 | shdev->common.chancnt = 0; |
| 1105 | } |
| 1106 | |
| 1107 | static int __init sh_dmae_probe(struct platform_device *pdev) |
| 1108 | { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1109 | struct sh_dmae_pdata *pdata = pdev->dev.platform_data; |
| 1110 | unsigned long irqflags = IRQF_DISABLED, |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 1111 | chan_flag[SH_DMAC_MAX_CHANNELS] = {}; |
| 1112 | int errirq, chan_irq[SH_DMAC_MAX_CHANNELS]; |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1113 | int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1114 | struct sh_dmae_device *shdev; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1115 | struct resource *chan, *dmars, *errirq_res, *chanirq_res; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1116 | |
Dan Williams | 56adf7e | 2009-11-22 12:10:10 -0700 | [diff] [blame] | 1117 | /* get platform data */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1118 | if (!pdata || !pdata->channel_num) |
Dan Williams | 56adf7e | 2009-11-22 12:10:10 -0700 | [diff] [blame] | 1119 | return -ENODEV; |
| 1120 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1121 | chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 1122 | /* DMARS area is optional */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1123 | dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 1124 | /* |
| 1125 | * IRQ resources: |
| 1126 | * 1. there always must be at least one IRQ IO-resource. On SH4 it is |
| 1127 | * the error IRQ, in which case it is the only IRQ in this resource: |
| 1128 | * start == end. If it is the only IRQ resource, all channels also |
| 1129 | * use the same IRQ. |
| 1130 | * 2. DMA channel IRQ resources can be specified one per resource or in |
| 1131 | * ranges (start != end) |
| 1132 | * 3. iff all events (channels and, optionally, error) on this |
| 1133 | * controller use the same IRQ, only one IRQ resource can be |
| 1134 | * specified, otherwise there must be one IRQ per channel, even if |
| 1135 | * some of them are equal |
| 1136 | * 4. if all IRQs on this controller are equal or if some specific IRQs |
| 1137 | * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be |
| 1138 | * requested with the IRQF_SHARED flag |
| 1139 | */ |
| 1140 | errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| 1141 | if (!chan || !errirq_res) |
| 1142 | return -ENODEV; |
| 1143 | |
| 1144 | if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) { |
| 1145 | dev_err(&pdev->dev, "DMAC register region already claimed\n"); |
| 1146 | return -EBUSY; |
| 1147 | } |
| 1148 | |
| 1149 | if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) { |
| 1150 | dev_err(&pdev->dev, "DMAC DMARS region already claimed\n"); |
| 1151 | err = -EBUSY; |
| 1152 | goto ermrdmars; |
| 1153 | } |
| 1154 | |
| 1155 | err = -ENOMEM; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1156 | shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL); |
| 1157 | if (!shdev) { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1158 | dev_err(&pdev->dev, "Not enough memory\n"); |
| 1159 | goto ealloc; |
| 1160 | } |
| 1161 | |
| 1162 | shdev->chan_reg = ioremap(chan->start, resource_size(chan)); |
| 1163 | if (!shdev->chan_reg) |
| 1164 | goto emapchan; |
| 1165 | if (dmars) { |
| 1166 | shdev->dmars = ioremap(dmars->start, resource_size(dmars)); |
| 1167 | if (!shdev->dmars) |
| 1168 | goto emapdmars; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1169 | } |
| 1170 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1171 | /* platform data */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1172 | shdev->pdata = pdata; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1173 | |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 1174 | if (pdata->chcr_offset) |
| 1175 | shdev->chcr_offset = pdata->chcr_offset; |
| 1176 | else |
| 1177 | shdev->chcr_offset = CHCR; |
| 1178 | |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 1179 | if (pdata->chcr_ie_bit) |
| 1180 | shdev->chcr_ie_bit = pdata->chcr_ie_bit; |
| 1181 | else |
| 1182 | shdev->chcr_ie_bit = CHCR_IE; |
| 1183 | |
Paul Mundt | 5c2de44 | 2011-05-31 15:53:03 +0900 | [diff] [blame] | 1184 | platform_set_drvdata(pdev, shdev); |
| 1185 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 1186 | pm_runtime_enable(&pdev->dev); |
| 1187 | pm_runtime_get_sync(&pdev->dev); |
| 1188 | |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1189 | spin_lock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1190 | list_add_tail_rcu(&shdev->node, &sh_dmae_devices); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1191 | spin_unlock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1192 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 1193 | /* reset dma controller - only needed as a test */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1194 | err = sh_dmae_rst(shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1195 | if (err) |
| 1196 | goto rst_err; |
| 1197 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1198 | INIT_LIST_HEAD(&shdev->common.channels); |
| 1199 | |
| 1200 | dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask); |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 1201 | if (pdata->slave && pdata->slave_num) |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1202 | dma_cap_set(DMA_SLAVE, shdev->common.cap_mask); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 1203 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1204 | shdev->common.device_alloc_chan_resources |
| 1205 | = sh_dmae_alloc_chan_resources; |
| 1206 | shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources; |
| 1207 | shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy; |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 1208 | shdev->common.device_tx_status = sh_dmae_tx_status; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1209 | shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 1210 | |
| 1211 | /* Compulsory for DMA_SLAVE fields */ |
| 1212 | shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg; |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 1213 | shdev->common.device_control = sh_dmae_control; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 1214 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1215 | shdev->common.dev = &pdev->dev; |
Guennadi Liakhovetski | ddb4f0f | 2009-12-04 19:44:41 +0100 | [diff] [blame] | 1216 | /* Default transfer size of 32 bytes requires 32-byte alignment */ |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 1217 | shdev->common.copy_align = LOG2_DEFAULT_XFER_SIZE; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1218 | |
Magnus Damm | 927a7c9 | 2010-03-19 04:47:19 +0000 | [diff] [blame] | 1219 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1220 | chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); |
| 1221 | |
| 1222 | if (!chanirq_res) |
| 1223 | chanirq_res = errirq_res; |
| 1224 | else |
| 1225 | irqres++; |
| 1226 | |
| 1227 | if (chanirq_res == errirq_res || |
| 1228 | (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1229 | irqflags = IRQF_SHARED; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1230 | |
| 1231 | errirq = errirq_res->start; |
| 1232 | |
| 1233 | err = request_irq(errirq, sh_dmae_err, irqflags, |
| 1234 | "DMAC Address Error", shdev); |
| 1235 | if (err) { |
| 1236 | dev_err(&pdev->dev, |
| 1237 | "DMA failed requesting irq #%d, error %d\n", |
| 1238 | errirq, err); |
| 1239 | goto eirq_err; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1240 | } |
| 1241 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1242 | #else |
| 1243 | chanirq_res = errirq_res; |
Magnus Damm | 927a7c9 | 2010-03-19 04:47:19 +0000 | [diff] [blame] | 1244 | #endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1245 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1246 | if (chanirq_res->start == chanirq_res->end && |
| 1247 | !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { |
| 1248 | /* Special case - all multiplexed */ |
| 1249 | for (; irq_cnt < pdata->channel_num; irq_cnt++) { |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1250 | if (irq_cnt < SH_DMAC_MAX_CHANNELS) { |
| 1251 | chan_irq[irq_cnt] = chanirq_res->start; |
| 1252 | chan_flag[irq_cnt] = IRQF_SHARED; |
| 1253 | } else { |
| 1254 | irq_cap = 1; |
| 1255 | break; |
| 1256 | } |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1257 | } |
| 1258 | } else { |
| 1259 | do { |
| 1260 | for (i = chanirq_res->start; i <= chanirq_res->end; i++) { |
Magnus Damm | dcee0bb | 2011-06-09 06:35:08 +0000 | [diff] [blame] | 1261 | if (irq_cnt >= SH_DMAC_MAX_CHANNELS) { |
| 1262 | irq_cap = 1; |
| 1263 | break; |
| 1264 | } |
| 1265 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1266 | if ((errirq_res->flags & IORESOURCE_BITS) == |
| 1267 | IORESOURCE_IRQ_SHAREABLE) |
| 1268 | chan_flag[irq_cnt] = IRQF_SHARED; |
| 1269 | else |
| 1270 | chan_flag[irq_cnt] = IRQF_DISABLED; |
| 1271 | dev_dbg(&pdev->dev, |
| 1272 | "Found IRQ %d for channel %d\n", |
| 1273 | i, irq_cnt); |
| 1274 | chan_irq[irq_cnt++] = i; |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1275 | } |
| 1276 | |
Magnus Damm | dcee0bb | 2011-06-09 06:35:08 +0000 | [diff] [blame] | 1277 | if (irq_cnt >= SH_DMAC_MAX_CHANNELS) |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1278 | break; |
Magnus Damm | dcee0bb | 2011-06-09 06:35:08 +0000 | [diff] [blame] | 1279 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1280 | chanirq_res = platform_get_resource(pdev, |
| 1281 | IORESOURCE_IRQ, ++irqres); |
| 1282 | } while (irq_cnt < pdata->channel_num && chanirq_res); |
| 1283 | } |
| 1284 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1285 | /* Create DMA Channel */ |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1286 | for (i = 0; i < irq_cnt; i++) { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1287 | err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1288 | if (err) |
| 1289 | goto chan_probe_err; |
| 1290 | } |
| 1291 | |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1292 | if (irq_cap) |
| 1293 | dev_notice(&pdev->dev, "Attempting to register %d DMA " |
| 1294 | "channels when a maximum of %d are supported.\n", |
| 1295 | pdata->channel_num, SH_DMAC_MAX_CHANNELS); |
| 1296 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 1297 | pm_runtime_put(&pdev->dev); |
| 1298 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1299 | dma_async_device_register(&shdev->common); |
| 1300 | |
| 1301 | return err; |
| 1302 | |
| 1303 | chan_probe_err: |
| 1304 | sh_dmae_chan_remove(shdev); |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1305 | |
Magnus Damm | 927a7c9 | 2010-03-19 04:47:19 +0000 | [diff] [blame] | 1306 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1307 | free_irq(errirq, shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1308 | eirq_err: |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1309 | #endif |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1310 | rst_err: |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1311 | spin_lock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1312 | list_del_rcu(&shdev->node); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1313 | spin_unlock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1314 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 1315 | pm_runtime_put(&pdev->dev); |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 1316 | pm_runtime_disable(&pdev->dev); |
| 1317 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1318 | if (dmars) |
| 1319 | iounmap(shdev->dmars); |
Paul Mundt | 5c2de44 | 2011-05-31 15:53:03 +0900 | [diff] [blame] | 1320 | |
| 1321 | platform_set_drvdata(pdev, NULL); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1322 | emapdmars: |
| 1323 | iounmap(shdev->chan_reg); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1324 | synchronize_rcu(); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1325 | emapchan: |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1326 | kfree(shdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1327 | ealloc: |
| 1328 | if (dmars) |
| 1329 | release_mem_region(dmars->start, resource_size(dmars)); |
| 1330 | ermrdmars: |
| 1331 | release_mem_region(chan->start, resource_size(chan)); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1332 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1333 | return err; |
| 1334 | } |
| 1335 | |
| 1336 | static int __exit sh_dmae_remove(struct platform_device *pdev) |
| 1337 | { |
| 1338 | struct sh_dmae_device *shdev = platform_get_drvdata(pdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1339 | struct resource *res; |
| 1340 | int errirq = platform_get_irq(pdev, 0); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1341 | |
| 1342 | dma_async_device_unregister(&shdev->common); |
| 1343 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1344 | if (errirq > 0) |
| 1345 | free_irq(errirq, shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1346 | |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1347 | spin_lock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1348 | list_del_rcu(&shdev->node); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1349 | spin_unlock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1350 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1351 | /* channel data remove */ |
| 1352 | sh_dmae_chan_remove(shdev); |
| 1353 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 1354 | pm_runtime_disable(&pdev->dev); |
| 1355 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1356 | if (shdev->dmars) |
| 1357 | iounmap(shdev->dmars); |
| 1358 | iounmap(shdev->chan_reg); |
| 1359 | |
Paul Mundt | 5c2de44 | 2011-05-31 15:53:03 +0900 | [diff] [blame] | 1360 | platform_set_drvdata(pdev, NULL); |
| 1361 | |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1362 | synchronize_rcu(); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1363 | kfree(shdev); |
| 1364 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1365 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1366 | if (res) |
| 1367 | release_mem_region(res->start, resource_size(res)); |
| 1368 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 1369 | if (res) |
| 1370 | release_mem_region(res->start, resource_size(res)); |
| 1371 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1372 | return 0; |
| 1373 | } |
| 1374 | |
| 1375 | static void sh_dmae_shutdown(struct platform_device *pdev) |
| 1376 | { |
| 1377 | struct sh_dmae_device *shdev = platform_get_drvdata(pdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1378 | sh_dmae_ctl_stop(shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1379 | } |
| 1380 | |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 1381 | static int sh_dmae_runtime_suspend(struct device *dev) |
| 1382 | { |
| 1383 | return 0; |
| 1384 | } |
| 1385 | |
| 1386 | static int sh_dmae_runtime_resume(struct device *dev) |
| 1387 | { |
| 1388 | struct sh_dmae_device *shdev = dev_get_drvdata(dev); |
| 1389 | |
| 1390 | return sh_dmae_rst(shdev); |
| 1391 | } |
| 1392 | |
| 1393 | #ifdef CONFIG_PM |
| 1394 | static int sh_dmae_suspend(struct device *dev) |
| 1395 | { |
| 1396 | struct sh_dmae_device *shdev = dev_get_drvdata(dev); |
| 1397 | int i; |
| 1398 | |
| 1399 | for (i = 0; i < shdev->pdata->channel_num; i++) { |
| 1400 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
| 1401 | if (sh_chan->descs_allocated) |
| 1402 | sh_chan->pm_error = pm_runtime_put_sync(dev); |
| 1403 | } |
| 1404 | |
| 1405 | return 0; |
| 1406 | } |
| 1407 | |
| 1408 | static int sh_dmae_resume(struct device *dev) |
| 1409 | { |
| 1410 | struct sh_dmae_device *shdev = dev_get_drvdata(dev); |
| 1411 | int i; |
| 1412 | |
| 1413 | for (i = 0; i < shdev->pdata->channel_num; i++) { |
| 1414 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
| 1415 | struct sh_dmae_slave *param = sh_chan->common.private; |
| 1416 | |
| 1417 | if (!sh_chan->descs_allocated) |
| 1418 | continue; |
| 1419 | |
| 1420 | if (!sh_chan->pm_error) |
| 1421 | pm_runtime_get_sync(dev); |
| 1422 | |
| 1423 | if (param) { |
| 1424 | const struct sh_dmae_slave_config *cfg = param->config; |
| 1425 | dmae_set_dmars(sh_chan, cfg->mid_rid); |
| 1426 | dmae_set_chcr(sh_chan, cfg->chcr); |
| 1427 | } else { |
| 1428 | dmae_init(sh_chan); |
| 1429 | } |
| 1430 | } |
| 1431 | |
| 1432 | return 0; |
| 1433 | } |
| 1434 | #else |
| 1435 | #define sh_dmae_suspend NULL |
| 1436 | #define sh_dmae_resume NULL |
| 1437 | #endif |
| 1438 | |
| 1439 | const struct dev_pm_ops sh_dmae_pm = { |
| 1440 | .suspend = sh_dmae_suspend, |
| 1441 | .resume = sh_dmae_resume, |
| 1442 | .runtime_suspend = sh_dmae_runtime_suspend, |
| 1443 | .runtime_resume = sh_dmae_runtime_resume, |
| 1444 | }; |
| 1445 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1446 | static struct platform_driver sh_dmae_driver = { |
| 1447 | .remove = __exit_p(sh_dmae_remove), |
| 1448 | .shutdown = sh_dmae_shutdown, |
| 1449 | .driver = { |
Guennadi Liakhovetski | 7a5c106 | 2010-05-21 15:28:51 +0000 | [diff] [blame] | 1450 | .owner = THIS_MODULE, |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1451 | .name = "sh-dma-engine", |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 1452 | .pm = &sh_dmae_pm, |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1453 | }, |
| 1454 | }; |
| 1455 | |
| 1456 | static int __init sh_dmae_init(void) |
| 1457 | { |
Guennadi Liakhovetski | 661382f | 2011-01-06 17:04:50 +0000 | [diff] [blame] | 1458 | /* Wire up NMI handling */ |
| 1459 | int err = register_die_notifier(&sh_dmae_nmi_notifier); |
| 1460 | if (err) |
| 1461 | return err; |
| 1462 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1463 | return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); |
| 1464 | } |
| 1465 | module_init(sh_dmae_init); |
| 1466 | |
| 1467 | static void __exit sh_dmae_exit(void) |
| 1468 | { |
| 1469 | platform_driver_unregister(&sh_dmae_driver); |
Guennadi Liakhovetski | 661382f | 2011-01-06 17:04:50 +0000 | [diff] [blame] | 1470 | |
| 1471 | unregister_die_notifier(&sh_dmae_nmi_notifier); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1472 | } |
| 1473 | module_exit(sh_dmae_exit); |
| 1474 | |
| 1475 | MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>"); |
| 1476 | MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); |
| 1477 | MODULE_LICENSE("GPL"); |
Guennadi Liakhovetski | e584334 | 2010-11-24 09:48:10 +0000 | [diff] [blame] | 1478 | MODULE_ALIAS("platform:sh-dma-engine"); |