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> |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 26 | #include <linux/platform_device.h> |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 27 | #include <linux/pm_runtime.h> |
Magnus Damm | b2623a6 | 2010-03-19 04:47:10 +0000 | [diff] [blame] | 28 | #include <linux/sh_dma.h> |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 29 | #include <linux/notifier.h> |
| 30 | #include <linux/kdebug.h> |
| 31 | #include <linux/spinlock.h> |
| 32 | #include <linux/rculist.h> |
Russell King - ARM Linux | d2ebfb3 | 2012-03-06 22:34:26 +0000 | [diff] [blame] | 33 | |
| 34 | #include "dmaengine.h" |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 35 | #include "shdma.h" |
| 36 | |
| 37 | /* DMA descriptor control */ |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 38 | enum sh_dmae_desc_status { |
| 39 | DESC_IDLE, |
| 40 | DESC_PREPARED, |
| 41 | DESC_SUBMITTED, |
| 42 | DESC_COMPLETED, /* completed, have to call callback */ |
| 43 | DESC_WAITING, /* callback called, waiting for ack / re-submit */ |
| 44 | }; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 45 | |
| 46 | #define NR_DESCS_PER_CHANNEL 32 |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 47 | /* Default MEMCPY transfer size = 2^2 = 4 bytes */ |
| 48 | #define LOG2_DEFAULT_XFER_SIZE 2 |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 49 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 50 | /* |
| 51 | * Used for write-side mutual exclusion for the global device list, |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 52 | * read-side synchronization by way of RCU, and per-controller data. |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 53 | */ |
| 54 | static DEFINE_SPINLOCK(sh_dmae_lock); |
| 55 | static LIST_HEAD(sh_dmae_devices); |
| 56 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 57 | /* A bitmask with bits enough for enum sh_dmae_slave_chan_id */ |
Magnus Damm | 02ca508 | 2010-03-19 04:46:47 +0000 | [diff] [blame] | 58 | 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] | 59 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 60 | static void sh_dmae_chan_ld_cleanup(struct sh_dmae_chan *sh_chan, bool all); |
Guennadi Liakhovetski | c11b46c | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 61 | static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan); |
| 62 | |
| 63 | static void chclr_write(struct sh_dmae_chan *sh_dc, u32 data) |
| 64 | { |
| 65 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); |
| 66 | |
| 67 | __raw_writel(data, shdev->chan_reg + |
| 68 | shdev->pdata->channel[sh_dc->id].chclr_offset); |
| 69 | } |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 70 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 71 | static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) |
| 72 | { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 73 | __raw_writel(data, sh_dc->base + reg / sizeof(u32)); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 74 | } |
| 75 | |
| 76 | static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) |
| 77 | { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 78 | return __raw_readl(sh_dc->base + reg / sizeof(u32)); |
| 79 | } |
| 80 | |
| 81 | static u16 dmaor_read(struct sh_dmae_device *shdev) |
| 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 | return __raw_readl(addr); |
| 87 | else |
| 88 | return __raw_readw(addr); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 89 | } |
| 90 | |
| 91 | static void dmaor_write(struct sh_dmae_device *shdev, u16 data) |
| 92 | { |
Kuninori Morimoto | e76c3af | 2011-06-17 08:20:56 +0000 | [diff] [blame] | 93 | u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32); |
| 94 | |
| 95 | if (shdev->pdata->dmaor_is_32bit) |
| 96 | __raw_writel(data, addr); |
| 97 | else |
| 98 | __raw_writew(data, addr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 99 | } |
| 100 | |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 101 | static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data) |
| 102 | { |
| 103 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); |
| 104 | |
| 105 | __raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32)); |
| 106 | } |
| 107 | |
| 108 | static u32 chcr_read(struct sh_dmae_chan *sh_dc) |
| 109 | { |
| 110 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); |
| 111 | |
| 112 | return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32)); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 113 | } |
| 114 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 115 | /* |
| 116 | * Reset DMA controller |
| 117 | * |
| 118 | * SH7780 has two DMAOR register |
| 119 | */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 120 | static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 121 | { |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 122 | unsigned short dmaor; |
| 123 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 124 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 125 | spin_lock_irqsave(&sh_dmae_lock, flags); |
| 126 | |
| 127 | dmaor = dmaor_read(shdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 128 | dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME)); |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 129 | |
| 130 | spin_unlock_irqrestore(&sh_dmae_lock, flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 131 | } |
| 132 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 133 | static int sh_dmae_rst(struct sh_dmae_device *shdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 134 | { |
| 135 | unsigned short dmaor; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 136 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 137 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 138 | spin_lock_irqsave(&sh_dmae_lock, flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 139 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 140 | dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME); |
| 141 | |
Guennadi Liakhovetski | c11b46c | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 142 | if (shdev->pdata->chclr_present) { |
| 143 | int i; |
| 144 | for (i = 0; i < shdev->pdata->channel_num; i++) { |
| 145 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
| 146 | if (sh_chan) |
| 147 | chclr_write(sh_chan, 0); |
| 148 | } |
| 149 | } |
| 150 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 151 | dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init); |
| 152 | |
| 153 | dmaor = dmaor_read(shdev); |
| 154 | |
| 155 | spin_unlock_irqrestore(&sh_dmae_lock, flags); |
| 156 | |
| 157 | if (dmaor & (DMAOR_AE | DMAOR_NMIF)) { |
| 158 | dev_warn(shdev->common.dev, "Can't initialize DMAOR.\n"); |
| 159 | return -EIO; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 160 | } |
Guennadi Liakhovetski | c11b46c | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 161 | if (shdev->pdata->dmaor_init & ~dmaor) |
| 162 | dev_warn(shdev->common.dev, |
| 163 | "DMAOR=0x%x hasn't latched the initial value 0x%x.\n", |
| 164 | dmaor, shdev->pdata->dmaor_init); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 165 | return 0; |
| 166 | } |
| 167 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 168 | static bool dmae_is_busy(struct sh_dmae_chan *sh_chan) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 169 | { |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 170 | u32 chcr = chcr_read(sh_chan); |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 171 | |
| 172 | if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE) |
| 173 | return true; /* working */ |
| 174 | |
| 175 | return false; /* waiting */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 176 | } |
| 177 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 178 | 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] | 179 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 180 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 181 | struct sh_dmae_pdata *pdata = shdev->pdata; |
| 182 | int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) | |
| 183 | ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift); |
Guennadi Liakhovetski | 623b4ac | 2010-02-03 14:44:12 +0000 | [diff] [blame] | 184 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 185 | if (cnt >= pdata->ts_shift_num) |
| 186 | cnt = 0; |
| 187 | |
| 188 | return pdata->ts_shift[cnt]; |
| 189 | } |
| 190 | |
| 191 | static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size) |
| 192 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 193 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 194 | struct sh_dmae_pdata *pdata = shdev->pdata; |
| 195 | int i; |
| 196 | |
| 197 | for (i = 0; i < pdata->ts_shift_num; i++) |
| 198 | if (pdata->ts_shift[i] == l2size) |
| 199 | break; |
| 200 | |
| 201 | if (i == pdata->ts_shift_num) |
| 202 | i = 0; |
| 203 | |
| 204 | return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) | |
| 205 | ((i << pdata->ts_high_shift) & pdata->ts_high_mask); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 206 | } |
| 207 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 208 | 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] | 209 | { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 210 | sh_dmae_writel(sh_chan, hw->sar, SAR); |
| 211 | sh_dmae_writel(sh_chan, hw->dar, DAR); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 212 | sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | static void dmae_start(struct sh_dmae_chan *sh_chan) |
| 216 | { |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 217 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 218 | u32 chcr = chcr_read(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 219 | |
Kuninori Morimoto | 260bf2c | 2011-06-17 08:21:05 +0000 | [diff] [blame] | 220 | if (shdev->pdata->needs_tend_set) |
| 221 | sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND); |
| 222 | |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 223 | chcr |= CHCR_DE | shdev->chcr_ie_bit; |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 224 | chcr_write(sh_chan, chcr & ~CHCR_TE); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | static void dmae_halt(struct sh_dmae_chan *sh_chan) |
| 228 | { |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 229 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 230 | u32 chcr = chcr_read(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 231 | |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 232 | chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 233 | chcr_write(sh_chan, chcr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 234 | } |
| 235 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 236 | static void dmae_init(struct sh_dmae_chan *sh_chan) |
| 237 | { |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 238 | /* |
| 239 | * Default configuration for dual address memory-memory transfer. |
| 240 | * 0x400 represents auto-request. |
| 241 | */ |
| 242 | u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan, |
| 243 | LOG2_DEFAULT_XFER_SIZE); |
| 244 | sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 245 | chcr_write(sh_chan, chcr); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 246 | } |
| 247 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 248 | static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) |
| 249 | { |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 250 | /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */ |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 251 | if (dmae_is_busy(sh_chan)) |
| 252 | return -EBUSY; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 253 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 254 | sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 255 | chcr_write(sh_chan, val); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 256 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 257 | return 0; |
| 258 | } |
| 259 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 260 | static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) |
| 261 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 262 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 263 | struct sh_dmae_pdata *pdata = shdev->pdata; |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 264 | const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->id]; |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 265 | u16 __iomem *addr = shdev->dmars; |
Kuninori Morimoto | 090b918 | 2011-06-16 05:08:28 +0000 | [diff] [blame] | 266 | unsigned int shift = chan_pdata->dmars_bit; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 267 | |
| 268 | if (dmae_is_busy(sh_chan)) |
| 269 | return -EBUSY; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 270 | |
Kuninori Morimoto | 260bf2c | 2011-06-17 08:21:05 +0000 | [diff] [blame] | 271 | if (pdata->no_dmars) |
| 272 | return 0; |
| 273 | |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 274 | /* in the case of a missing DMARS resource use first memory window */ |
| 275 | if (!addr) |
| 276 | addr = (u16 __iomem *)shdev->chan_reg; |
| 277 | addr += chan_pdata->dmars / sizeof(u16); |
| 278 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 279 | __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift), |
| 280 | addr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 281 | |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | static dma_cookie_t sh_dmae_tx_submit(struct dma_async_tx_descriptor *tx) |
| 286 | { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 287 | 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] | 288 | struct sh_dmae_chan *sh_chan = to_sh_chan(tx->chan); |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 289 | struct sh_dmae_slave *param = tx->chan->private; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 290 | dma_async_tx_callback callback = tx->callback; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 291 | dma_cookie_t cookie; |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 292 | bool power_up; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 293 | |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 294 | spin_lock_irq(&sh_chan->desc_lock); |
| 295 | |
| 296 | if (list_empty(&sh_chan->ld_queue)) |
| 297 | power_up = true; |
| 298 | else |
| 299 | power_up = false; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 300 | |
Russell King - ARM Linux | 884485e | 2012-03-06 22:34:46 +0000 | [diff] [blame] | 301 | cookie = dma_cookie_assign(tx); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 302 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 303 | /* Mark all chunks of this descriptor as submitted, move to the queue */ |
| 304 | list_for_each_entry_safe(chunk, c, desc->node.prev, node) { |
| 305 | /* |
| 306 | * All chunks are on the global ld_free, so, we have to find |
| 307 | * the end of the chain ourselves |
| 308 | */ |
| 309 | if (chunk != desc && (chunk->mark == DESC_IDLE || |
| 310 | chunk->async_tx.cookie > 0 || |
| 311 | chunk->async_tx.cookie == -EBUSY || |
| 312 | &chunk->node == &sh_chan->ld_free)) |
| 313 | break; |
| 314 | chunk->mark = DESC_SUBMITTED; |
| 315 | /* Callback goes to the last chunk */ |
| 316 | chunk->async_tx.callback = NULL; |
| 317 | chunk->cookie = cookie; |
| 318 | list_move_tail(&chunk->node, &sh_chan->ld_queue); |
| 319 | last = chunk; |
| 320 | } |
| 321 | |
| 322 | last->async_tx.callback = callback; |
| 323 | last->async_tx.callback_param = tx->callback_param; |
| 324 | |
| 325 | dev_dbg(sh_chan->dev, "submit #%d@%p on %d: %x[%d] -> %x\n", |
| 326 | tx->cookie, &last->async_tx, sh_chan->id, |
| 327 | desc->hw.sar, desc->hw.tcr, desc->hw.dar); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 328 | |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 329 | if (power_up) { |
| 330 | sh_chan->pm_state = DMAE_PM_BUSY; |
| 331 | |
| 332 | pm_runtime_get(sh_chan->dev); |
| 333 | |
| 334 | spin_unlock_irq(&sh_chan->desc_lock); |
| 335 | |
| 336 | pm_runtime_barrier(sh_chan->dev); |
| 337 | |
| 338 | spin_lock_irq(&sh_chan->desc_lock); |
| 339 | |
| 340 | /* Have we been reset, while waiting? */ |
| 341 | if (sh_chan->pm_state != DMAE_PM_ESTABLISHED) { |
| 342 | dev_dbg(sh_chan->dev, "Bring up channel %d\n", |
| 343 | sh_chan->id); |
| 344 | if (param) { |
| 345 | const struct sh_dmae_slave_config *cfg = |
| 346 | param->config; |
| 347 | |
| 348 | dmae_set_dmars(sh_chan, cfg->mid_rid); |
| 349 | dmae_set_chcr(sh_chan, cfg->chcr); |
| 350 | } else { |
| 351 | dmae_init(sh_chan); |
| 352 | } |
| 353 | |
| 354 | if (sh_chan->pm_state == DMAE_PM_PENDING) |
| 355 | sh_chan_xfer_ld_queue(sh_chan); |
| 356 | sh_chan->pm_state = DMAE_PM_ESTABLISHED; |
| 357 | } |
Guennadi Liakhovetski | c11b46c | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 358 | } else { |
| 359 | sh_chan->pm_state = DMAE_PM_PENDING; |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 360 | } |
| 361 | |
| 362 | spin_unlock_irq(&sh_chan->desc_lock); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 363 | |
| 364 | return cookie; |
| 365 | } |
| 366 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 367 | /* Called with desc_lock held */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 368 | static struct sh_desc *sh_dmae_get_desc(struct sh_dmae_chan *sh_chan) |
| 369 | { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 370 | struct sh_desc *desc; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 371 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 372 | list_for_each_entry(desc, &sh_chan->ld_free, node) |
| 373 | if (desc->mark != DESC_PREPARED) { |
| 374 | BUG_ON(desc->mark != DESC_IDLE); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 375 | list_del(&desc->node); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 376 | return desc; |
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 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 379 | return NULL; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 380 | } |
| 381 | |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 382 | static const struct sh_dmae_slave_config *sh_dmae_find_slave( |
Magnus Damm | 4bab9d4 | 2010-03-19 04:46:38 +0000 | [diff] [blame] | 383 | struct sh_dmae_chan *sh_chan, struct sh_dmae_slave *param) |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 384 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 385 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 386 | struct sh_dmae_pdata *pdata = shdev->pdata; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 387 | int i; |
| 388 | |
Magnus Damm | 02ca508 | 2010-03-19 04:46:47 +0000 | [diff] [blame] | 389 | if (param->slave_id >= SH_DMA_SLAVE_NUMBER) |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 390 | return NULL; |
| 391 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 392 | for (i = 0; i < pdata->slave_num; i++) |
Magnus Damm | 4bab9d4 | 2010-03-19 04:46:38 +0000 | [diff] [blame] | 393 | if (pdata->slave[i].slave_id == param->slave_id) |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 394 | return pdata->slave + i; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 395 | |
| 396 | return NULL; |
| 397 | } |
| 398 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 399 | static int sh_dmae_alloc_chan_resources(struct dma_chan *chan) |
| 400 | { |
| 401 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
| 402 | struct sh_desc *desc; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 403 | struct sh_dmae_slave *param = chan->private; |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 404 | int ret; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 405 | |
| 406 | /* |
| 407 | * This relies on the guarantee from dmaengine that alloc_chan_resources |
| 408 | * never runs concurrently with itself or free_chan_resources. |
| 409 | */ |
| 410 | if (param) { |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 411 | const struct sh_dmae_slave_config *cfg; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 412 | |
Magnus Damm | 4bab9d4 | 2010-03-19 04:46:38 +0000 | [diff] [blame] | 413 | cfg = sh_dmae_find_slave(sh_chan, param); |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 414 | if (!cfg) { |
| 415 | ret = -EINVAL; |
| 416 | goto efindslave; |
| 417 | } |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 418 | |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 419 | if (test_and_set_bit(param->slave_id, sh_dmae_slave_used)) { |
| 420 | ret = -EBUSY; |
| 421 | goto etestused; |
| 422 | } |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 423 | |
| 424 | param->config = cfg; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 425 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 426 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 427 | while (sh_chan->descs_allocated < NR_DESCS_PER_CHANNEL) { |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 428 | desc = kzalloc(sizeof(struct sh_desc), GFP_KERNEL); |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 429 | if (!desc) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 430 | break; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 431 | dma_async_tx_descriptor_init(&desc->async_tx, |
| 432 | &sh_chan->common); |
| 433 | desc->async_tx.tx_submit = sh_dmae_tx_submit; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 434 | desc->mark = DESC_IDLE; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 435 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 436 | list_add(&desc->node, &sh_chan->ld_free); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 437 | sh_chan->descs_allocated++; |
| 438 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 439 | |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 440 | if (!sh_chan->descs_allocated) { |
| 441 | ret = -ENOMEM; |
| 442 | goto edescalloc; |
| 443 | } |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 444 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 445 | return sh_chan->descs_allocated; |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 446 | |
| 447 | edescalloc: |
| 448 | if (param) |
| 449 | clear_bit(param->slave_id, sh_dmae_slave_used); |
| 450 | etestused: |
| 451 | efindslave: |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 452 | chan->private = NULL; |
Guennadi Liakhovetski | 83515bc | 2010-04-19 08:39:39 +0000 | [diff] [blame] | 453 | return ret; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 454 | } |
| 455 | |
| 456 | /* |
| 457 | * sh_dma_free_chan_resources - Free all resources of the channel. |
| 458 | */ |
| 459 | static void sh_dmae_free_chan_resources(struct dma_chan *chan) |
| 460 | { |
| 461 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
| 462 | struct sh_desc *desc, *_desc; |
| 463 | LIST_HEAD(list); |
| 464 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 465 | /* Protect against ISR */ |
| 466 | spin_lock_irq(&sh_chan->desc_lock); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 467 | dmae_halt(sh_chan); |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 468 | spin_unlock_irq(&sh_chan->desc_lock); |
| 469 | |
| 470 | /* Now no new interrupts will occur */ |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 471 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 472 | /* Prepared and not submitted descriptors can still be on the queue */ |
| 473 | if (!list_empty(&sh_chan->ld_queue)) |
| 474 | sh_dmae_chan_ld_cleanup(sh_chan, true); |
| 475 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 476 | if (chan->private) { |
| 477 | /* The caller is holding dma_list_mutex */ |
| 478 | struct sh_dmae_slave *param = chan->private; |
| 479 | clear_bit(param->slave_id, sh_dmae_slave_used); |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 480 | chan->private = NULL; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 481 | } |
| 482 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 483 | spin_lock_irq(&sh_chan->desc_lock); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 484 | |
| 485 | list_splice_init(&sh_chan->ld_free, &list); |
| 486 | sh_chan->descs_allocated = 0; |
| 487 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 488 | spin_unlock_irq(&sh_chan->desc_lock); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 489 | |
| 490 | list_for_each_entry_safe(desc, _desc, &list, node) |
| 491 | kfree(desc); |
| 492 | } |
| 493 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 494 | /** |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 495 | * sh_dmae_add_desc - get, set up and return one transfer descriptor |
| 496 | * @sh_chan: DMA channel |
| 497 | * @flags: DMA transfer flags |
| 498 | * @dest: destination DMA address, incremented when direction equals |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 499 | * DMA_DEV_TO_MEM |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 500 | * @src: source DMA address, incremented when direction equals |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 501 | * DMA_MEM_TO_DEV |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 502 | * @len: DMA transfer length |
| 503 | * @first: if NULL, set to the current descriptor and cookie set to -EBUSY |
| 504 | * @direction: needed for slave DMA to decide which address to keep constant, |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 505 | * equals DMA_MEM_TO_MEM for MEMCPY |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 506 | * Returns 0 or an error |
| 507 | * Locks: called with desc_lock held |
| 508 | */ |
| 509 | static struct sh_desc *sh_dmae_add_desc(struct sh_dmae_chan *sh_chan, |
| 510 | unsigned long flags, dma_addr_t *dest, dma_addr_t *src, size_t *len, |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 511 | struct sh_desc **first, enum dma_transfer_direction direction) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 512 | { |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 513 | struct sh_desc *new; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 514 | size_t copy_size; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 515 | |
| 516 | if (!*len) |
| 517 | return NULL; |
| 518 | |
| 519 | /* Allocate the link descriptor from the free list */ |
| 520 | new = sh_dmae_get_desc(sh_chan); |
| 521 | if (!new) { |
| 522 | dev_err(sh_chan->dev, "No free link descriptor available\n"); |
| 523 | return NULL; |
| 524 | } |
| 525 | |
| 526 | copy_size = min(*len, (size_t)SH_DMA_TCR_MAX + 1); |
| 527 | |
| 528 | new->hw.sar = *src; |
| 529 | new->hw.dar = *dest; |
| 530 | new->hw.tcr = copy_size; |
| 531 | |
| 532 | if (!*first) { |
| 533 | /* First desc */ |
| 534 | new->async_tx.cookie = -EBUSY; |
| 535 | *first = new; |
| 536 | } else { |
| 537 | /* Other desc - invisible to the user */ |
| 538 | new->async_tx.cookie = -EINVAL; |
| 539 | } |
| 540 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 541 | dev_dbg(sh_chan->dev, |
| 542 | "chaining (%u/%u)@%x -> %x with %p, cookie %d, shift %d\n", |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 543 | copy_size, *len, *src, *dest, &new->async_tx, |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 544 | new->async_tx.cookie, sh_chan->xmit_shift); |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 545 | |
| 546 | new->mark = DESC_PREPARED; |
| 547 | new->async_tx.flags = flags; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 548 | new->direction = direction; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 549 | |
| 550 | *len -= copy_size; |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 551 | if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV) |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 552 | *src += copy_size; |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 553 | if (direction == DMA_MEM_TO_MEM || direction == DMA_DEV_TO_MEM) |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 554 | *dest += copy_size; |
| 555 | |
| 556 | return new; |
| 557 | } |
| 558 | |
| 559 | /* |
| 560 | * sh_dmae_prep_sg - prepare transfer descriptors from an SG list |
| 561 | * |
| 562 | * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also |
| 563 | * converted to scatter-gather to guarantee consistent locking and a correct |
| 564 | * list manipulation. For slave DMA direction carries the usual meaning, and, |
| 565 | * logically, the SG list is RAM and the addr variable contains slave address, |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 566 | * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 567 | * and the SG list contains only one element and points at the source buffer. |
| 568 | */ |
| 569 | static struct dma_async_tx_descriptor *sh_dmae_prep_sg(struct sh_dmae_chan *sh_chan, |
| 570 | struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr, |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 571 | enum dma_transfer_direction direction, unsigned long flags) |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 572 | { |
| 573 | struct scatterlist *sg; |
| 574 | struct sh_desc *first = NULL, *new = NULL /* compiler... */; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 575 | LIST_HEAD(tx_list); |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 576 | int chunks = 0; |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 577 | unsigned long irq_flags; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 578 | int i; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 579 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 580 | if (!sg_len) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 581 | return NULL; |
| 582 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 583 | for_each_sg(sgl, sg, sg_len, i) |
| 584 | chunks += (sg_dma_len(sg) + SH_DMA_TCR_MAX) / |
| 585 | (SH_DMA_TCR_MAX + 1); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 586 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 587 | /* Have to lock the whole loop to protect against concurrent release */ |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 588 | spin_lock_irqsave(&sh_chan->desc_lock, irq_flags); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 589 | |
| 590 | /* |
| 591 | * Chaining: |
| 592 | * first descriptor is what user is dealing with in all API calls, its |
| 593 | * cookie is at first set to -EBUSY, at tx-submit to a positive |
| 594 | * number |
| 595 | * if more than one chunk is needed further chunks have cookie = -EINVAL |
| 596 | * the last chunk, if not equal to the first, has cookie = -ENOSPC |
| 597 | * all chunks are linked onto the tx_list head with their .node heads |
| 598 | * only during this function, then they are immediately spliced |
| 599 | * back onto the free list in form of a chain |
| 600 | */ |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 601 | for_each_sg(sgl, sg, sg_len, i) { |
| 602 | dma_addr_t sg_addr = sg_dma_address(sg); |
| 603 | size_t len = sg_dma_len(sg); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 604 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 605 | if (!len) |
| 606 | goto err_get_desc; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 607 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 608 | do { |
| 609 | dev_dbg(sh_chan->dev, "Add SG #%d@%p[%d], dma %llx\n", |
| 610 | i, sg, len, (unsigned long long)sg_addr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 611 | |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 612 | if (direction == DMA_DEV_TO_MEM) |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 613 | new = sh_dmae_add_desc(sh_chan, flags, |
| 614 | &sg_addr, addr, &len, &first, |
| 615 | direction); |
| 616 | else |
| 617 | new = sh_dmae_add_desc(sh_chan, flags, |
| 618 | addr, &sg_addr, &len, &first, |
| 619 | direction); |
| 620 | if (!new) |
| 621 | goto err_get_desc; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 622 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 623 | new->chunks = chunks--; |
| 624 | list_add_tail(&new->node, &tx_list); |
| 625 | } while (len); |
| 626 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 627 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 628 | if (new != first) |
| 629 | new->async_tx.cookie = -ENOSPC; |
| 630 | |
| 631 | /* Put them back on the free list, so, they don't get lost */ |
| 632 | list_splice_tail(&tx_list, &sh_chan->ld_free); |
| 633 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 634 | spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 635 | |
| 636 | return &first->async_tx; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 637 | |
| 638 | err_get_desc: |
| 639 | list_for_each_entry(new, &tx_list, node) |
| 640 | new->mark = DESC_IDLE; |
| 641 | list_splice(&tx_list, &sh_chan->ld_free); |
| 642 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 643 | spin_unlock_irqrestore(&sh_chan->desc_lock, irq_flags); |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 644 | |
| 645 | return NULL; |
| 646 | } |
| 647 | |
| 648 | static struct dma_async_tx_descriptor *sh_dmae_prep_memcpy( |
| 649 | struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, |
| 650 | size_t len, unsigned long flags) |
| 651 | { |
| 652 | struct sh_dmae_chan *sh_chan; |
| 653 | struct scatterlist sg; |
| 654 | |
| 655 | if (!chan || !len) |
| 656 | return NULL; |
| 657 | |
| 658 | sh_chan = to_sh_chan(chan); |
| 659 | |
| 660 | sg_init_table(&sg, 1); |
| 661 | sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len, |
| 662 | offset_in_page(dma_src)); |
| 663 | sg_dma_address(&sg) = dma_src; |
| 664 | sg_dma_len(&sg) = len; |
| 665 | |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 666 | return sh_dmae_prep_sg(sh_chan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM, |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 667 | flags); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 668 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 669 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 670 | static struct dma_async_tx_descriptor *sh_dmae_prep_slave_sg( |
| 671 | struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 672 | enum dma_transfer_direction direction, unsigned long flags) |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 673 | { |
| 674 | struct sh_dmae_slave *param; |
| 675 | struct sh_dmae_chan *sh_chan; |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 676 | dma_addr_t slave_addr; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 677 | |
| 678 | if (!chan) |
| 679 | return NULL; |
| 680 | |
| 681 | sh_chan = to_sh_chan(chan); |
| 682 | param = chan->private; |
| 683 | |
| 684 | /* Someone calling slave DMA on a public channel? */ |
| 685 | if (!param || !sg_len) { |
| 686 | dev_warn(sh_chan->dev, "%s: bad parameter: %p, %d, %d\n", |
| 687 | __func__, param, sg_len, param ? param->slave_id : -1); |
| 688 | return NULL; |
| 689 | } |
| 690 | |
Dan Carpenter | 9f9ff20 | 2010-08-14 11:01:45 +0200 | [diff] [blame] | 691 | slave_addr = param->config->addr; |
| 692 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 693 | /* |
| 694 | * if (param != NULL), this is a successfully requested slave channel, |
| 695 | * therefore param->config != NULL too. |
| 696 | */ |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 697 | return sh_dmae_prep_sg(sh_chan, sgl, sg_len, &slave_addr, |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 698 | direction, flags); |
| 699 | } |
| 700 | |
Linus Walleij | 0582763 | 2010-05-17 16:30:42 -0700 | [diff] [blame] | 701 | static int sh_dmae_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
| 702 | unsigned long arg) |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 703 | { |
| 704 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 705 | unsigned long flags; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 706 | |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 707 | /* Only supports DMA_TERMINATE_ALL */ |
| 708 | if (cmd != DMA_TERMINATE_ALL) |
| 709 | return -ENXIO; |
| 710 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 711 | if (!chan) |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 712 | return -EINVAL; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 713 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 714 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | c014906 | 2010-02-18 16:30:02 +0000 | [diff] [blame] | 715 | dmae_halt(sh_chan); |
| 716 | |
Guennadi Liakhovetski | c014906 | 2010-02-18 16:30:02 +0000 | [diff] [blame] | 717 | if (!list_empty(&sh_chan->ld_queue)) { |
| 718 | /* Record partial transfer */ |
| 719 | struct sh_desc *desc = list_entry(sh_chan->ld_queue.next, |
| 720 | struct sh_desc, node); |
| 721 | desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) << |
| 722 | sh_chan->xmit_shift; |
Guennadi Liakhovetski | c014906 | 2010-02-18 16:30:02 +0000 | [diff] [blame] | 723 | } |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 724 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | c014906 | 2010-02-18 16:30:02 +0000 | [diff] [blame] | 725 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 726 | sh_dmae_chan_ld_cleanup(sh_chan, true); |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 727 | |
| 728 | return 0; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 729 | } |
| 730 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 731 | static dma_async_tx_callback __ld_cleanup(struct sh_dmae_chan *sh_chan, bool all) |
| 732 | { |
| 733 | struct sh_desc *desc, *_desc; |
| 734 | /* Is the "exposed" head of a chain acked? */ |
| 735 | bool head_acked = false; |
| 736 | dma_cookie_t cookie = 0; |
| 737 | dma_async_tx_callback callback = NULL; |
| 738 | void *param = NULL; |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 739 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 740 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 741 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 742 | list_for_each_entry_safe(desc, _desc, &sh_chan->ld_queue, node) { |
| 743 | struct dma_async_tx_descriptor *tx = &desc->async_tx; |
| 744 | |
| 745 | BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie); |
| 746 | BUG_ON(desc->mark != DESC_SUBMITTED && |
| 747 | desc->mark != DESC_COMPLETED && |
| 748 | desc->mark != DESC_WAITING); |
| 749 | |
| 750 | /* |
| 751 | * queue is ordered, and we use this loop to (1) clean up all |
| 752 | * completed descriptors, and to (2) update descriptor flags of |
| 753 | * any chunks in a (partially) completed chain |
| 754 | */ |
| 755 | if (!all && desc->mark == DESC_SUBMITTED && |
| 756 | desc->cookie != cookie) |
| 757 | break; |
| 758 | |
| 759 | if (tx->cookie > 0) |
| 760 | cookie = tx->cookie; |
| 761 | |
| 762 | if (desc->mark == DESC_COMPLETED && desc->chunks == 1) { |
Russell King - ARM Linux | 4d4e58d | 2012-03-06 22:34:06 +0000 | [diff] [blame] | 763 | if (sh_chan->common.completed_cookie != desc->cookie - 1) |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 764 | dev_dbg(sh_chan->dev, |
| 765 | "Completing cookie %d, expected %d\n", |
| 766 | desc->cookie, |
Russell King - ARM Linux | 4d4e58d | 2012-03-06 22:34:06 +0000 | [diff] [blame] | 767 | sh_chan->common.completed_cookie + 1); |
| 768 | sh_chan->common.completed_cookie = desc->cookie; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 769 | } |
| 770 | |
| 771 | /* Call callback on the last chunk */ |
| 772 | if (desc->mark == DESC_COMPLETED && tx->callback) { |
| 773 | desc->mark = DESC_WAITING; |
| 774 | callback = tx->callback; |
| 775 | param = tx->callback_param; |
| 776 | dev_dbg(sh_chan->dev, "descriptor #%d@%p on %d callback\n", |
| 777 | tx->cookie, tx, sh_chan->id); |
| 778 | BUG_ON(desc->chunks != 1); |
| 779 | break; |
| 780 | } |
| 781 | |
| 782 | if (tx->cookie > 0 || tx->cookie == -EBUSY) { |
| 783 | if (desc->mark == DESC_COMPLETED) { |
| 784 | BUG_ON(tx->cookie < 0); |
| 785 | desc->mark = DESC_WAITING; |
| 786 | } |
| 787 | head_acked = async_tx_test_ack(tx); |
| 788 | } else { |
| 789 | switch (desc->mark) { |
| 790 | case DESC_COMPLETED: |
| 791 | desc->mark = DESC_WAITING; |
| 792 | /* Fall through */ |
| 793 | case DESC_WAITING: |
| 794 | if (head_acked) |
| 795 | async_tx_ack(&desc->async_tx); |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | dev_dbg(sh_chan->dev, "descriptor %p #%d completed.\n", |
| 800 | tx, tx->cookie); |
| 801 | |
| 802 | if (((desc->mark == DESC_COMPLETED || |
| 803 | desc->mark == DESC_WAITING) && |
| 804 | async_tx_test_ack(&desc->async_tx)) || all) { |
| 805 | /* Remove from ld_queue list */ |
| 806 | desc->mark = DESC_IDLE; |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 807 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 808 | list_move(&desc->node, &sh_chan->ld_free); |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 809 | |
| 810 | if (list_empty(&sh_chan->ld_queue)) { |
| 811 | dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id); |
| 812 | pm_runtime_put(sh_chan->dev); |
| 813 | } |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 814 | } |
| 815 | } |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 816 | |
| 817 | if (all && !callback) |
| 818 | /* |
| 819 | * Terminating and the loop completed normally: forgive |
| 820 | * uncompleted cookies |
| 821 | */ |
Russell King - ARM Linux | 4d4e58d | 2012-03-06 22:34:06 +0000 | [diff] [blame] | 822 | sh_chan->common.completed_cookie = sh_chan->common.cookie; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 823 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 824 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 825 | |
| 826 | if (callback) |
| 827 | callback(param); |
| 828 | |
| 829 | return callback; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 830 | } |
| 831 | |
| 832 | /* |
| 833 | * sh_chan_ld_cleanup - Clean up link descriptors |
| 834 | * |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 835 | * This function cleans up the ld_queue of DMA channel. |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 836 | */ |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 837 | 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] | 838 | { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 839 | while (__ld_cleanup(sh_chan, all)) |
| 840 | ; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 841 | } |
| 842 | |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 843 | /* Called under spin_lock_irq(&sh_chan->desc_lock) */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 844 | static void sh_chan_xfer_ld_queue(struct sh_dmae_chan *sh_chan) |
| 845 | { |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 846 | struct sh_desc *desc; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 847 | |
| 848 | /* DMA work check */ |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 849 | if (dmae_is_busy(sh_chan)) |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 850 | return; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 851 | |
Justin P. Mattock | 5a3a765 | 2011-01-19 15:36:38 +0100 | [diff] [blame] | 852 | /* Find the first not transferred descriptor */ |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 853 | list_for_each_entry(desc, &sh_chan->ld_queue, node) |
| 854 | if (desc->mark == DESC_SUBMITTED) { |
Guennadi Liakhovetski | c014906 | 2010-02-18 16:30:02 +0000 | [diff] [blame] | 855 | dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n", |
| 856 | desc->async_tx.cookie, sh_chan->id, |
| 857 | desc->hw.tcr, desc->hw.sar, desc->hw.dar); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 858 | /* Get the ld start address from ld_queue */ |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 859 | dmae_set_reg(sh_chan, &desc->hw); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 860 | dmae_start(sh_chan); |
| 861 | break; |
| 862 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 863 | } |
| 864 | |
| 865 | static void sh_dmae_memcpy_issue_pending(struct dma_chan *chan) |
| 866 | { |
| 867 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 868 | |
| 869 | spin_lock_irq(&sh_chan->desc_lock); |
| 870 | if (sh_chan->pm_state == DMAE_PM_ESTABLISHED) |
| 871 | sh_chan_xfer_ld_queue(sh_chan); |
| 872 | else |
| 873 | sh_chan->pm_state = DMAE_PM_PENDING; |
| 874 | spin_unlock_irq(&sh_chan->desc_lock); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 875 | } |
| 876 | |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 877 | static enum dma_status sh_dmae_tx_status(struct dma_chan *chan, |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 878 | dma_cookie_t cookie, |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 879 | struct dma_tx_state *txstate) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 880 | { |
| 881 | struct sh_dmae_chan *sh_chan = to_sh_chan(chan); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 882 | enum dma_status status; |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 883 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 884 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 885 | sh_dmae_chan_ld_cleanup(sh_chan, false); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 886 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 887 | spin_lock_irqsave(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 888 | |
Russell King - ARM Linux | 96a2af4 | 2012-03-06 22:35:27 +0000 | [diff] [blame] | 889 | status = dma_cookie_status(chan, cookie, txstate); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 890 | |
| 891 | /* |
| 892 | * If we don't find cookie on the queue, it has been aborted and we have |
| 893 | * to report error |
| 894 | */ |
| 895 | if (status != DMA_SUCCESS) { |
| 896 | struct sh_desc *desc; |
| 897 | status = DMA_ERROR; |
| 898 | list_for_each_entry(desc, &sh_chan->ld_queue, node) |
| 899 | if (desc->cookie == cookie) { |
| 900 | status = DMA_IN_PROGRESS; |
| 901 | break; |
| 902 | } |
| 903 | } |
| 904 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 905 | spin_unlock_irqrestore(&sh_chan->desc_lock, flags); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 906 | |
| 907 | return status; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 908 | } |
| 909 | |
| 910 | static irqreturn_t sh_dmae_interrupt(int irq, void *data) |
| 911 | { |
| 912 | irqreturn_t ret = IRQ_NONE; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 913 | struct sh_dmae_chan *sh_chan = data; |
| 914 | u32 chcr; |
| 915 | |
| 916 | spin_lock(&sh_chan->desc_lock); |
| 917 | |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 918 | chcr = chcr_read(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 919 | |
| 920 | if (chcr & CHCR_TE) { |
| 921 | /* DMA stop */ |
| 922 | dmae_halt(sh_chan); |
| 923 | |
| 924 | ret = IRQ_HANDLED; |
| 925 | tasklet_schedule(&sh_chan->tasklet); |
| 926 | } |
| 927 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 928 | spin_unlock(&sh_chan->desc_lock); |
| 929 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 930 | return ret; |
| 931 | } |
| 932 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 933 | /* Called from error IRQ or NMI */ |
| 934 | static bool sh_dmae_reset(struct sh_dmae_device *shdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 935 | { |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 936 | unsigned int handled = 0; |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 937 | int i; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 938 | |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 939 | /* halt the dma controller */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 940 | sh_dmae_ctl_stop(shdev); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 941 | |
| 942 | /* We cannot detect, which channel caused the error, have to reset all */ |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 943 | for (i = 0; i < SH_DMAC_MAX_CHANNELS; i++) { |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 944 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 945 | struct sh_desc *desc; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 946 | LIST_HEAD(dl); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 947 | |
| 948 | if (!sh_chan) |
| 949 | continue; |
| 950 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 951 | spin_lock(&sh_chan->desc_lock); |
| 952 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 953 | /* Stop the channel */ |
| 954 | dmae_halt(sh_chan); |
| 955 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 956 | list_splice_init(&sh_chan->ld_queue, &dl); |
| 957 | |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 958 | if (!list_empty(&dl)) { |
| 959 | dev_dbg(sh_chan->dev, "Bring down channel %d\n", sh_chan->id); |
| 960 | pm_runtime_put(sh_chan->dev); |
| 961 | } |
| 962 | sh_chan->pm_state = DMAE_PM_ESTABLISHED; |
| 963 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 964 | spin_unlock(&sh_chan->desc_lock); |
| 965 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 966 | /* Complete all */ |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 967 | list_for_each_entry(desc, &dl, node) { |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 968 | struct dma_async_tx_descriptor *tx = &desc->async_tx; |
| 969 | desc->mark = DESC_IDLE; |
| 970 | if (tx->callback) |
| 971 | tx->callback(tx->callback_param); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 972 | } |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 973 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 974 | spin_lock(&sh_chan->desc_lock); |
| 975 | list_splice(&dl, &sh_chan->ld_free); |
| 976 | spin_unlock(&sh_chan->desc_lock); |
| 977 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 978 | handled++; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 979 | } |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 980 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 981 | sh_dmae_rst(shdev); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 982 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 983 | return !!handled; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 984 | } |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 985 | |
| 986 | static irqreturn_t sh_dmae_err(int irq, void *data) |
| 987 | { |
Yoshihiro Shimoda | ff7690b | 2011-02-09 07:46:47 +0000 | [diff] [blame] | 988 | struct sh_dmae_device *shdev = data; |
| 989 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 990 | if (!(dmaor_read(shdev) & DMAOR_AE)) |
Yoshihiro Shimoda | ff7690b | 2011-02-09 07:46:47 +0000 | [diff] [blame] | 991 | return IRQ_NONE; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 992 | |
| 993 | sh_dmae_reset(data); |
| 994 | return IRQ_HANDLED; |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 995 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 996 | |
| 997 | static void dmae_do_tasklet(unsigned long data) |
| 998 | { |
| 999 | struct sh_dmae_chan *sh_chan = (struct sh_dmae_chan *)data; |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 1000 | struct sh_desc *desc; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1001 | u32 sar_buf = sh_dmae_readl(sh_chan, SAR); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 1002 | u32 dar_buf = sh_dmae_readl(sh_chan, DAR); |
Guennadi Liakhovetski | 86d61b3 | 2009-12-10 18:35:07 +0100 | [diff] [blame] | 1003 | |
Guennadi Liakhovetski | b4dae6e | 2011-09-25 16:12:18 +0200 | [diff] [blame] | 1004 | spin_lock_irq(&sh_chan->desc_lock); |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 1005 | list_for_each_entry(desc, &sh_chan->ld_queue, node) { |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 1006 | if (desc->mark == DESC_SUBMITTED && |
Vinod Koul | db8196d | 2011-10-13 22:34:23 +0530 | [diff] [blame] | 1007 | ((desc->direction == DMA_DEV_TO_MEM && |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 1008 | (desc->hw.dar + desc->hw.tcr) == dar_buf) || |
| 1009 | (desc->hw.sar + desc->hw.tcr) == sar_buf)) { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 1010 | dev_dbg(sh_chan->dev, "done #%d@%p dst %u\n", |
| 1011 | desc->async_tx.cookie, &desc->async_tx, |
| 1012 | desc->hw.dar); |
| 1013 | desc->mark = DESC_COMPLETED; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1014 | break; |
| 1015 | } |
| 1016 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1017 | /* Next desc */ |
| 1018 | sh_chan_xfer_ld_queue(sh_chan); |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 1019 | spin_unlock_irq(&sh_chan->desc_lock); |
| 1020 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 1021 | sh_dmae_chan_ld_cleanup(sh_chan, false); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1022 | } |
| 1023 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1024 | static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev) |
| 1025 | { |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1026 | /* Fast path out if NMIF is not asserted for this controller */ |
| 1027 | if ((dmaor_read(shdev) & DMAOR_NMIF) == 0) |
| 1028 | return false; |
| 1029 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 1030 | return sh_dmae_reset(shdev); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1031 | } |
| 1032 | |
| 1033 | static int sh_dmae_nmi_handler(struct notifier_block *self, |
| 1034 | unsigned long cmd, void *data) |
| 1035 | { |
| 1036 | struct sh_dmae_device *shdev; |
| 1037 | int ret = NOTIFY_DONE; |
| 1038 | bool triggered; |
| 1039 | |
| 1040 | /* |
| 1041 | * Only concern ourselves with NMI events. |
| 1042 | * |
| 1043 | * Normally we would check the die chain value, but as this needs |
| 1044 | * to be architecture independent, check for NMI context instead. |
| 1045 | */ |
| 1046 | if (!in_nmi()) |
| 1047 | return NOTIFY_DONE; |
| 1048 | |
| 1049 | rcu_read_lock(); |
| 1050 | list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) { |
| 1051 | /* |
| 1052 | * Only stop if one of the controllers has NMIF asserted, |
| 1053 | * we do not want to interfere with regular address error |
| 1054 | * handling or NMI events that don't concern the DMACs. |
| 1055 | */ |
| 1056 | triggered = sh_dmae_nmi_notify(shdev); |
| 1057 | if (triggered == true) |
| 1058 | ret = NOTIFY_OK; |
| 1059 | } |
| 1060 | rcu_read_unlock(); |
| 1061 | |
| 1062 | return ret; |
| 1063 | } |
| 1064 | |
| 1065 | static struct notifier_block sh_dmae_nmi_notifier __read_mostly = { |
| 1066 | .notifier_call = sh_dmae_nmi_handler, |
| 1067 | |
| 1068 | /* Run before NMI debug handler and KGDB */ |
| 1069 | .priority = 1, |
| 1070 | }; |
| 1071 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1072 | static int __devinit sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id, |
| 1073 | int irq, unsigned long flags) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1074 | { |
| 1075 | int err; |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 1076 | const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id]; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1077 | struct platform_device *pdev = to_platform_device(shdev->common.dev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1078 | struct sh_dmae_chan *new_sh_chan; |
| 1079 | |
| 1080 | /* alloc channel */ |
| 1081 | new_sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL); |
| 1082 | if (!new_sh_chan) { |
Guennadi Liakhovetski | 86d61b3 | 2009-12-10 18:35:07 +0100 | [diff] [blame] | 1083 | dev_err(shdev->common.dev, |
| 1084 | "No free memory for allocating dma channels!\n"); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1085 | return -ENOMEM; |
| 1086 | } |
| 1087 | |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 1088 | new_sh_chan->pm_state = DMAE_PM_ESTABLISHED; |
| 1089 | |
| 1090 | /* reference struct dma_device */ |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 1091 | new_sh_chan->common.device = &shdev->common; |
Russell King - ARM Linux | 8ac6954 | 2012-03-06 22:36:27 +0000 | [diff] [blame^] | 1092 | dma_cookie_init(&new_sh_chan->common); |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 1093 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1094 | new_sh_chan->dev = shdev->common.dev; |
| 1095 | new_sh_chan->id = id; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1096 | new_sh_chan->irq = irq; |
| 1097 | new_sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1098 | |
| 1099 | /* Init DMA tasklet */ |
| 1100 | tasklet_init(&new_sh_chan->tasklet, dmae_do_tasklet, |
| 1101 | (unsigned long)new_sh_chan); |
| 1102 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1103 | spin_lock_init(&new_sh_chan->desc_lock); |
| 1104 | |
| 1105 | /* Init descripter manage list */ |
| 1106 | INIT_LIST_HEAD(&new_sh_chan->ld_queue); |
| 1107 | INIT_LIST_HEAD(&new_sh_chan->ld_free); |
| 1108 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1109 | /* Add the channel to DMA device channel list */ |
| 1110 | list_add_tail(&new_sh_chan->common.device_node, |
| 1111 | &shdev->common.channels); |
| 1112 | shdev->common.chancnt++; |
| 1113 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1114 | if (pdev->id >= 0) |
| 1115 | snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id), |
| 1116 | "sh-dmae%d.%d", pdev->id, new_sh_chan->id); |
| 1117 | else |
| 1118 | snprintf(new_sh_chan->dev_id, sizeof(new_sh_chan->dev_id), |
| 1119 | "sh-dma%d", new_sh_chan->id); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1120 | |
| 1121 | /* set up channel irq */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1122 | err = request_irq(irq, &sh_dmae_interrupt, flags, |
Guennadi Liakhovetski | 86d61b3 | 2009-12-10 18:35:07 +0100 | [diff] [blame] | 1123 | new_sh_chan->dev_id, new_sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1124 | if (err) { |
| 1125 | dev_err(shdev->common.dev, "DMA channel %d request_irq error " |
| 1126 | "with return %d\n", id, err); |
| 1127 | goto err_no_irq; |
| 1128 | } |
| 1129 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1130 | shdev->chan[id] = new_sh_chan; |
| 1131 | return 0; |
| 1132 | |
| 1133 | err_no_irq: |
| 1134 | /* remove from dmaengine device node */ |
| 1135 | list_del(&new_sh_chan->common.device_node); |
| 1136 | kfree(new_sh_chan); |
| 1137 | return err; |
| 1138 | } |
| 1139 | |
| 1140 | static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) |
| 1141 | { |
| 1142 | int i; |
| 1143 | |
| 1144 | for (i = shdev->common.chancnt - 1 ; i >= 0 ; i--) { |
| 1145 | if (shdev->chan[i]) { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1146 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1147 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1148 | free_irq(sh_chan->irq, sh_chan); |
| 1149 | |
| 1150 | list_del(&sh_chan->common.device_node); |
| 1151 | kfree(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1152 | shdev->chan[i] = NULL; |
| 1153 | } |
| 1154 | } |
| 1155 | shdev->common.chancnt = 0; |
| 1156 | } |
| 1157 | |
| 1158 | static int __init sh_dmae_probe(struct platform_device *pdev) |
| 1159 | { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1160 | struct sh_dmae_pdata *pdata = pdev->dev.platform_data; |
| 1161 | unsigned long irqflags = IRQF_DISABLED, |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 1162 | chan_flag[SH_DMAC_MAX_CHANNELS] = {}; |
| 1163 | int errirq, chan_irq[SH_DMAC_MAX_CHANNELS]; |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1164 | int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1165 | struct sh_dmae_device *shdev; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1166 | struct resource *chan, *dmars, *errirq_res, *chanirq_res; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1167 | |
Dan Williams | 56adf7e | 2009-11-22 12:10:10 -0700 | [diff] [blame] | 1168 | /* get platform data */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1169 | if (!pdata || !pdata->channel_num) |
Dan Williams | 56adf7e | 2009-11-22 12:10:10 -0700 | [diff] [blame] | 1170 | return -ENODEV; |
| 1171 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1172 | chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 1173 | /* DMARS area is optional */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1174 | dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 1175 | /* |
| 1176 | * IRQ resources: |
| 1177 | * 1. there always must be at least one IRQ IO-resource. On SH4 it is |
| 1178 | * the error IRQ, in which case it is the only IRQ in this resource: |
| 1179 | * start == end. If it is the only IRQ resource, all channels also |
| 1180 | * use the same IRQ. |
| 1181 | * 2. DMA channel IRQ resources can be specified one per resource or in |
| 1182 | * ranges (start != end) |
| 1183 | * 3. iff all events (channels and, optionally, error) on this |
| 1184 | * controller use the same IRQ, only one IRQ resource can be |
| 1185 | * specified, otherwise there must be one IRQ per channel, even if |
| 1186 | * some of them are equal |
| 1187 | * 4. if all IRQs on this controller are equal or if some specific IRQs |
| 1188 | * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be |
| 1189 | * requested with the IRQF_SHARED flag |
| 1190 | */ |
| 1191 | errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| 1192 | if (!chan || !errirq_res) |
| 1193 | return -ENODEV; |
| 1194 | |
| 1195 | if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) { |
| 1196 | dev_err(&pdev->dev, "DMAC register region already claimed\n"); |
| 1197 | return -EBUSY; |
| 1198 | } |
| 1199 | |
| 1200 | if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) { |
| 1201 | dev_err(&pdev->dev, "DMAC DMARS region already claimed\n"); |
| 1202 | err = -EBUSY; |
| 1203 | goto ermrdmars; |
| 1204 | } |
| 1205 | |
| 1206 | err = -ENOMEM; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1207 | shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL); |
| 1208 | if (!shdev) { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1209 | dev_err(&pdev->dev, "Not enough memory\n"); |
| 1210 | goto ealloc; |
| 1211 | } |
| 1212 | |
| 1213 | shdev->chan_reg = ioremap(chan->start, resource_size(chan)); |
| 1214 | if (!shdev->chan_reg) |
| 1215 | goto emapchan; |
| 1216 | if (dmars) { |
| 1217 | shdev->dmars = ioremap(dmars->start, resource_size(dmars)); |
| 1218 | if (!shdev->dmars) |
| 1219 | goto emapdmars; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1220 | } |
| 1221 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1222 | /* platform data */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1223 | shdev->pdata = pdata; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1224 | |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 1225 | if (pdata->chcr_offset) |
| 1226 | shdev->chcr_offset = pdata->chcr_offset; |
| 1227 | else |
| 1228 | shdev->chcr_offset = CHCR; |
| 1229 | |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 1230 | if (pdata->chcr_ie_bit) |
| 1231 | shdev->chcr_ie_bit = pdata->chcr_ie_bit; |
| 1232 | else |
| 1233 | shdev->chcr_ie_bit = CHCR_IE; |
| 1234 | |
Paul Mundt | 5c2de44 | 2011-05-31 15:53:03 +0900 | [diff] [blame] | 1235 | platform_set_drvdata(pdev, shdev); |
| 1236 | |
Guennadi Liakhovetski | c11b46c | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 1237 | shdev->common.dev = &pdev->dev; |
| 1238 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 1239 | pm_runtime_enable(&pdev->dev); |
| 1240 | pm_runtime_get_sync(&pdev->dev); |
| 1241 | |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1242 | spin_lock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1243 | list_add_tail_rcu(&shdev->node, &sh_dmae_devices); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1244 | spin_unlock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1245 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 1246 | /* reset dma controller - only needed as a test */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1247 | err = sh_dmae_rst(shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1248 | if (err) |
| 1249 | goto rst_err; |
| 1250 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1251 | INIT_LIST_HEAD(&shdev->common.channels); |
| 1252 | |
Guennadi Liakhovetski | e9c8d7a | 2012-01-18 10:14:25 +0100 | [diff] [blame] | 1253 | if (!pdata->slave_only) |
| 1254 | dma_cap_set(DMA_MEMCPY, shdev->common.cap_mask); |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 1255 | if (pdata->slave && pdata->slave_num) |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1256 | dma_cap_set(DMA_SLAVE, shdev->common.cap_mask); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 1257 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1258 | shdev->common.device_alloc_chan_resources |
| 1259 | = sh_dmae_alloc_chan_resources; |
| 1260 | shdev->common.device_free_chan_resources = sh_dmae_free_chan_resources; |
| 1261 | shdev->common.device_prep_dma_memcpy = sh_dmae_prep_memcpy; |
Linus Walleij | 0793448 | 2010-03-26 16:50:49 -0700 | [diff] [blame] | 1262 | shdev->common.device_tx_status = sh_dmae_tx_status; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1263 | shdev->common.device_issue_pending = sh_dmae_memcpy_issue_pending; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 1264 | |
| 1265 | /* Compulsory for DMA_SLAVE fields */ |
| 1266 | shdev->common.device_prep_slave_sg = sh_dmae_prep_slave_sg; |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 1267 | shdev->common.device_control = sh_dmae_control; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 1268 | |
Guennadi Liakhovetski | ddb4f0f | 2009-12-04 19:44:41 +0100 | [diff] [blame] | 1269 | /* Default transfer size of 32 bytes requires 32-byte alignment */ |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 1270 | shdev->common.copy_align = LOG2_DEFAULT_XFER_SIZE; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1271 | |
Magnus Damm | 927a7c9 | 2010-03-19 04:47:19 +0000 | [diff] [blame] | 1272 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1273 | chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); |
| 1274 | |
| 1275 | if (!chanirq_res) |
| 1276 | chanirq_res = errirq_res; |
| 1277 | else |
| 1278 | irqres++; |
| 1279 | |
| 1280 | if (chanirq_res == errirq_res || |
| 1281 | (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1282 | irqflags = IRQF_SHARED; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1283 | |
| 1284 | errirq = errirq_res->start; |
| 1285 | |
| 1286 | err = request_irq(errirq, sh_dmae_err, irqflags, |
| 1287 | "DMAC Address Error", shdev); |
| 1288 | if (err) { |
| 1289 | dev_err(&pdev->dev, |
| 1290 | "DMA failed requesting irq #%d, error %d\n", |
| 1291 | errirq, err); |
| 1292 | goto eirq_err; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1293 | } |
| 1294 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1295 | #else |
| 1296 | chanirq_res = errirq_res; |
Magnus Damm | 927a7c9 | 2010-03-19 04:47:19 +0000 | [diff] [blame] | 1297 | #endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1298 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1299 | if (chanirq_res->start == chanirq_res->end && |
| 1300 | !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { |
| 1301 | /* Special case - all multiplexed */ |
| 1302 | for (; irq_cnt < pdata->channel_num; irq_cnt++) { |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1303 | if (irq_cnt < SH_DMAC_MAX_CHANNELS) { |
| 1304 | chan_irq[irq_cnt] = chanirq_res->start; |
| 1305 | chan_flag[irq_cnt] = IRQF_SHARED; |
| 1306 | } else { |
| 1307 | irq_cap = 1; |
| 1308 | break; |
| 1309 | } |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1310 | } |
| 1311 | } else { |
| 1312 | do { |
| 1313 | for (i = chanirq_res->start; i <= chanirq_res->end; i++) { |
Magnus Damm | dcee0bb | 2011-06-09 06:35:08 +0000 | [diff] [blame] | 1314 | if (irq_cnt >= SH_DMAC_MAX_CHANNELS) { |
| 1315 | irq_cap = 1; |
| 1316 | break; |
| 1317 | } |
| 1318 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1319 | if ((errirq_res->flags & IORESOURCE_BITS) == |
| 1320 | IORESOURCE_IRQ_SHAREABLE) |
| 1321 | chan_flag[irq_cnt] = IRQF_SHARED; |
| 1322 | else |
| 1323 | chan_flag[irq_cnt] = IRQF_DISABLED; |
| 1324 | dev_dbg(&pdev->dev, |
| 1325 | "Found IRQ %d for channel %d\n", |
| 1326 | i, irq_cnt); |
| 1327 | chan_irq[irq_cnt++] = i; |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1328 | } |
| 1329 | |
Magnus Damm | dcee0bb | 2011-06-09 06:35:08 +0000 | [diff] [blame] | 1330 | if (irq_cnt >= SH_DMAC_MAX_CHANNELS) |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1331 | break; |
Magnus Damm | dcee0bb | 2011-06-09 06:35:08 +0000 | [diff] [blame] | 1332 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1333 | chanirq_res = platform_get_resource(pdev, |
| 1334 | IORESOURCE_IRQ, ++irqres); |
| 1335 | } while (irq_cnt < pdata->channel_num && chanirq_res); |
| 1336 | } |
| 1337 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1338 | /* Create DMA Channel */ |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1339 | for (i = 0; i < irq_cnt; i++) { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1340 | 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] | 1341 | if (err) |
| 1342 | goto chan_probe_err; |
| 1343 | } |
| 1344 | |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1345 | if (irq_cap) |
| 1346 | dev_notice(&pdev->dev, "Attempting to register %d DMA " |
| 1347 | "channels when a maximum of %d are supported.\n", |
| 1348 | pdata->channel_num, SH_DMAC_MAX_CHANNELS); |
| 1349 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 1350 | pm_runtime_put(&pdev->dev); |
| 1351 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1352 | dma_async_device_register(&shdev->common); |
| 1353 | |
| 1354 | return err; |
| 1355 | |
| 1356 | chan_probe_err: |
| 1357 | sh_dmae_chan_remove(shdev); |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 1358 | |
Magnus Damm | 927a7c9 | 2010-03-19 04:47:19 +0000 | [diff] [blame] | 1359 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1360 | free_irq(errirq, shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1361 | eirq_err: |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1362 | #endif |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1363 | rst_err: |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1364 | spin_lock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1365 | list_del_rcu(&shdev->node); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1366 | spin_unlock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1367 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 1368 | pm_runtime_put(&pdev->dev); |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 1369 | pm_runtime_disable(&pdev->dev); |
| 1370 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1371 | if (dmars) |
| 1372 | iounmap(shdev->dmars); |
Paul Mundt | 5c2de44 | 2011-05-31 15:53:03 +0900 | [diff] [blame] | 1373 | |
| 1374 | platform_set_drvdata(pdev, NULL); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1375 | emapdmars: |
| 1376 | iounmap(shdev->chan_reg); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1377 | synchronize_rcu(); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1378 | emapchan: |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1379 | kfree(shdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1380 | ealloc: |
| 1381 | if (dmars) |
| 1382 | release_mem_region(dmars->start, resource_size(dmars)); |
| 1383 | ermrdmars: |
| 1384 | release_mem_region(chan->start, resource_size(chan)); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1385 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1386 | return err; |
| 1387 | } |
| 1388 | |
| 1389 | static int __exit sh_dmae_remove(struct platform_device *pdev) |
| 1390 | { |
| 1391 | struct sh_dmae_device *shdev = platform_get_drvdata(pdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1392 | struct resource *res; |
| 1393 | int errirq = platform_get_irq(pdev, 0); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1394 | |
| 1395 | dma_async_device_unregister(&shdev->common); |
| 1396 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1397 | if (errirq > 0) |
| 1398 | free_irq(errirq, shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1399 | |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1400 | spin_lock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1401 | list_del_rcu(&shdev->node); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1402 | spin_unlock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 1403 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1404 | /* channel data remove */ |
| 1405 | sh_dmae_chan_remove(shdev); |
| 1406 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 1407 | pm_runtime_disable(&pdev->dev); |
| 1408 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1409 | if (shdev->dmars) |
| 1410 | iounmap(shdev->dmars); |
| 1411 | iounmap(shdev->chan_reg); |
| 1412 | |
Paul Mundt | 5c2de44 | 2011-05-31 15:53:03 +0900 | [diff] [blame] | 1413 | platform_set_drvdata(pdev, NULL); |
| 1414 | |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 1415 | synchronize_rcu(); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1416 | kfree(shdev); |
| 1417 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1418 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1419 | if (res) |
| 1420 | release_mem_region(res->start, resource_size(res)); |
| 1421 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 1422 | if (res) |
| 1423 | release_mem_region(res->start, resource_size(res)); |
| 1424 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1425 | return 0; |
| 1426 | } |
| 1427 | |
| 1428 | static void sh_dmae_shutdown(struct platform_device *pdev) |
| 1429 | { |
| 1430 | struct sh_dmae_device *shdev = platform_get_drvdata(pdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 1431 | sh_dmae_ctl_stop(shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1432 | } |
| 1433 | |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 1434 | static int sh_dmae_runtime_suspend(struct device *dev) |
| 1435 | { |
| 1436 | return 0; |
| 1437 | } |
| 1438 | |
| 1439 | static int sh_dmae_runtime_resume(struct device *dev) |
| 1440 | { |
| 1441 | struct sh_dmae_device *shdev = dev_get_drvdata(dev); |
| 1442 | |
| 1443 | return sh_dmae_rst(shdev); |
| 1444 | } |
| 1445 | |
| 1446 | #ifdef CONFIG_PM |
| 1447 | static int sh_dmae_suspend(struct device *dev) |
| 1448 | { |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 1449 | return 0; |
| 1450 | } |
| 1451 | |
| 1452 | static int sh_dmae_resume(struct device *dev) |
| 1453 | { |
| 1454 | struct sh_dmae_device *shdev = dev_get_drvdata(dev); |
Guennadi Liakhovetski | c11b46c | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 1455 | int i, ret; |
| 1456 | |
| 1457 | ret = sh_dmae_rst(shdev); |
| 1458 | if (ret < 0) |
| 1459 | dev_err(dev, "Failed to reset!\n"); |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 1460 | |
| 1461 | for (i = 0; i < shdev->pdata->channel_num; i++) { |
| 1462 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
| 1463 | struct sh_dmae_slave *param = sh_chan->common.private; |
| 1464 | |
| 1465 | if (!sh_chan->descs_allocated) |
| 1466 | continue; |
| 1467 | |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 1468 | if (param) { |
| 1469 | const struct sh_dmae_slave_config *cfg = param->config; |
| 1470 | dmae_set_dmars(sh_chan, cfg->mid_rid); |
| 1471 | dmae_set_chcr(sh_chan, cfg->chcr); |
| 1472 | } else { |
| 1473 | dmae_init(sh_chan); |
| 1474 | } |
| 1475 | } |
| 1476 | |
| 1477 | return 0; |
| 1478 | } |
| 1479 | #else |
| 1480 | #define sh_dmae_suspend NULL |
| 1481 | #define sh_dmae_resume NULL |
| 1482 | #endif |
| 1483 | |
| 1484 | const struct dev_pm_ops sh_dmae_pm = { |
| 1485 | .suspend = sh_dmae_suspend, |
| 1486 | .resume = sh_dmae_resume, |
| 1487 | .runtime_suspend = sh_dmae_runtime_suspend, |
| 1488 | .runtime_resume = sh_dmae_runtime_resume, |
| 1489 | }; |
| 1490 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1491 | static struct platform_driver sh_dmae_driver = { |
| 1492 | .remove = __exit_p(sh_dmae_remove), |
| 1493 | .shutdown = sh_dmae_shutdown, |
| 1494 | .driver = { |
Guennadi Liakhovetski | 7a5c106 | 2010-05-21 15:28:51 +0000 | [diff] [blame] | 1495 | .owner = THIS_MODULE, |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1496 | .name = "sh-dma-engine", |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 1497 | .pm = &sh_dmae_pm, |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1498 | }, |
| 1499 | }; |
| 1500 | |
| 1501 | static int __init sh_dmae_init(void) |
| 1502 | { |
Guennadi Liakhovetski | 661382f | 2011-01-06 17:04:50 +0000 | [diff] [blame] | 1503 | /* Wire up NMI handling */ |
| 1504 | int err = register_die_notifier(&sh_dmae_nmi_notifier); |
| 1505 | if (err) |
| 1506 | return err; |
| 1507 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1508 | return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); |
| 1509 | } |
| 1510 | module_init(sh_dmae_init); |
| 1511 | |
| 1512 | static void __exit sh_dmae_exit(void) |
| 1513 | { |
| 1514 | platform_driver_unregister(&sh_dmae_driver); |
Guennadi Liakhovetski | 661382f | 2011-01-06 17:04:50 +0000 | [diff] [blame] | 1515 | |
| 1516 | unregister_die_notifier(&sh_dmae_nmi_notifier); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 1517 | } |
| 1518 | module_exit(sh_dmae_exit); |
| 1519 | |
| 1520 | MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>"); |
| 1521 | MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); |
| 1522 | MODULE_LICENSE("GPL"); |
Guennadi Liakhovetski | e584334 | 2010-11-24 09:48:10 +0000 | [diff] [blame] | 1523 | MODULE_ALIAS("platform:sh-dma-engine"); |