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 | * |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 6 | * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 7 | * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> |
| 8 | * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. |
| 9 | * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. |
| 10 | * |
| 11 | * This is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * - DMA of SuperH does not have Hardware DMA chain mode. |
| 17 | * - MAX DMA size is 16MB. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/dmaengine.h> |
| 26 | #include <linux/delay.h> |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 27 | #include <linux/platform_device.h> |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 28 | #include <linux/pm_runtime.h> |
Magnus Damm | b2623a6 | 2010-03-19 04:47:10 +0000 | [diff] [blame] | 29 | #include <linux/sh_dma.h> |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 30 | #include <linux/notifier.h> |
| 31 | #include <linux/kdebug.h> |
| 32 | #include <linux/spinlock.h> |
| 33 | #include <linux/rculist.h> |
Russell King - ARM Linux | d2ebfb3 | 2012-03-06 22:34:26 +0000 | [diff] [blame] | 34 | |
Guennadi Liakhovetski | e95be94 | 2012-07-02 22:30:53 +0200 | [diff] [blame] | 35 | #include "../dmaengine.h" |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 36 | #include "shdma.h" |
| 37 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 38 | #define SH_DMAE_DRV_NAME "sh-dma-engine" |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 39 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 40 | /* Default MEMCPY transfer size = 2^2 = 4 bytes */ |
| 41 | #define LOG2_DEFAULT_XFER_SIZE 2 |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 42 | #define SH_DMA_SLAVE_NUMBER 256 |
| 43 | #define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 44 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 45 | /* |
| 46 | * Used for write-side mutual exclusion for the global device list, |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 47 | * read-side synchronization by way of RCU, and per-controller data. |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 48 | */ |
| 49 | static DEFINE_SPINLOCK(sh_dmae_lock); |
| 50 | static LIST_HEAD(sh_dmae_devices); |
| 51 | |
Guennadi Liakhovetski | ca8b387 | 2013-07-10 12:09:47 +0200 | [diff] [blame] | 52 | /* |
| 53 | * Different DMAC implementations provide different ways to clear DMA channels: |
| 54 | * (1) none - no CHCLR registers are available |
| 55 | * (2) one CHCLR register per channel - 0 has to be written to it to clear |
| 56 | * channel buffers |
| 57 | * (3) one CHCLR per several channels - 1 has to be written to the bit, |
| 58 | * corresponding to the specific channel to reset it |
| 59 | */ |
Guennadi Liakhovetski | a28a94e | 2013-07-02 17:37:58 +0200 | [diff] [blame] | 60 | static void channel_clear(struct sh_dmae_chan *sh_dc) |
Guennadi Liakhovetski | c11b46c32 | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 61 | { |
| 62 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); |
Guennadi Liakhovetski | ca8b387 | 2013-07-10 12:09:47 +0200 | [diff] [blame] | 63 | const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel + |
| 64 | sh_dc->shdma_chan.id; |
| 65 | u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0; |
Guennadi Liakhovetski | c11b46c32 | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 66 | |
Guennadi Liakhovetski | ca8b387 | 2013-07-10 12:09:47 +0200 | [diff] [blame] | 67 | __raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset); |
Guennadi Liakhovetski | c11b46c32 | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 68 | } |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 69 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 70 | static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) |
| 71 | { |
Guennadi Liakhovetski | 115357e | 2013-07-02 17:46:01 +0200 | [diff] [blame] | 72 | __raw_writel(data, sh_dc->base + reg); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 73 | } |
| 74 | |
| 75 | static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) |
| 76 | { |
Guennadi Liakhovetski | 115357e | 2013-07-02 17:46:01 +0200 | [diff] [blame] | 77 | return __raw_readl(sh_dc->base + reg); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | static u16 dmaor_read(struct sh_dmae_device *shdev) |
| 81 | { |
Guennadi Liakhovetski | 115357e | 2013-07-02 17:46:01 +0200 | [diff] [blame] | 82 | void __iomem *addr = shdev->chan_reg + DMAOR; |
Kuninori Morimoto | e76c3af | 2011-06-17 08:20:56 +0000 | [diff] [blame] | 83 | |
| 84 | if (shdev->pdata->dmaor_is_32bit) |
| 85 | return __raw_readl(addr); |
| 86 | else |
| 87 | return __raw_readw(addr); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | static void dmaor_write(struct sh_dmae_device *shdev, u16 data) |
| 91 | { |
Guennadi Liakhovetski | 115357e | 2013-07-02 17:46:01 +0200 | [diff] [blame] | 92 | void __iomem *addr = shdev->chan_reg + DMAOR; |
Kuninori Morimoto | e76c3af | 2011-06-17 08:20:56 +0000 | [diff] [blame] | 93 | |
| 94 | if (shdev->pdata->dmaor_is_32bit) |
| 95 | __raw_writel(data, addr); |
| 96 | else |
| 97 | __raw_writew(data, addr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 98 | } |
| 99 | |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 100 | static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data) |
| 101 | { |
| 102 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); |
| 103 | |
Guennadi Liakhovetski | 115357e | 2013-07-02 17:46:01 +0200 | [diff] [blame] | 104 | __raw_writel(data, sh_dc->base + shdev->chcr_offset); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | static u32 chcr_read(struct sh_dmae_chan *sh_dc) |
| 108 | { |
| 109 | struct sh_dmae_device *shdev = to_sh_dev(sh_dc); |
| 110 | |
Guennadi Liakhovetski | 115357e | 2013-07-02 17:46:01 +0200 | [diff] [blame] | 111 | return __raw_readl(sh_dc->base + shdev->chcr_offset); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 112 | } |
| 113 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 114 | /* |
| 115 | * Reset DMA controller |
| 116 | * |
| 117 | * SH7780 has two DMAOR register |
| 118 | */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 119 | static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 120 | { |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 121 | unsigned short dmaor; |
| 122 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 123 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 124 | spin_lock_irqsave(&sh_dmae_lock, flags); |
| 125 | |
| 126 | dmaor = dmaor_read(shdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 127 | dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME)); |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 128 | |
| 129 | spin_unlock_irqrestore(&sh_dmae_lock, flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 130 | } |
| 131 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 132 | static int sh_dmae_rst(struct sh_dmae_device *shdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 133 | { |
| 134 | unsigned short dmaor; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 135 | unsigned long flags; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 136 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 137 | spin_lock_irqsave(&sh_dmae_lock, flags); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 138 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 139 | dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME); |
| 140 | |
Guennadi Liakhovetski | c11b46c32 | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 141 | if (shdev->pdata->chclr_present) { |
| 142 | int i; |
| 143 | for (i = 0; i < shdev->pdata->channel_num; i++) { |
| 144 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
| 145 | if (sh_chan) |
Guennadi Liakhovetski | a28a94e | 2013-07-02 17:37:58 +0200 | [diff] [blame] | 146 | channel_clear(sh_chan); |
Guennadi Liakhovetski | c11b46c32 | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 147 | } |
| 148 | } |
| 149 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 150 | dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init); |
| 151 | |
| 152 | dmaor = dmaor_read(shdev); |
| 153 | |
| 154 | spin_unlock_irqrestore(&sh_dmae_lock, flags); |
| 155 | |
| 156 | if (dmaor & (DMAOR_AE | DMAOR_NMIF)) { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 157 | dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n"); |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 158 | return -EIO; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 159 | } |
Guennadi Liakhovetski | c11b46c32 | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 160 | if (shdev->pdata->dmaor_init & ~dmaor) |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 161 | dev_warn(shdev->shdma_dev.dma_dev.dev, |
Guennadi Liakhovetski | c11b46c32 | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 162 | "DMAOR=0x%x hasn't latched the initial value 0x%x.\n", |
| 163 | dmaor, shdev->pdata->dmaor_init); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 164 | return 0; |
| 165 | } |
| 166 | |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 167 | static bool dmae_is_busy(struct sh_dmae_chan *sh_chan) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 168 | { |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 169 | u32 chcr = chcr_read(sh_chan); |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 170 | |
| 171 | if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE) |
| 172 | return true; /* working */ |
| 173 | |
| 174 | return false; /* waiting */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 175 | } |
| 176 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 177 | 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] | 178 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 179 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 2833c47 | 2013-08-02 16:18:09 +0200 | [diff] [blame^] | 180 | const struct sh_dmae_pdata *pdata = shdev->pdata; |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 181 | int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) | |
| 182 | ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift); |
Guennadi Liakhovetski | 623b4ac | 2010-02-03 14:44:12 +0000 | [diff] [blame] | 183 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 184 | if (cnt >= pdata->ts_shift_num) |
| 185 | cnt = 0; |
| 186 | |
| 187 | return pdata->ts_shift[cnt]; |
| 188 | } |
| 189 | |
| 190 | static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size) |
| 191 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 192 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 2833c47 | 2013-08-02 16:18:09 +0200 | [diff] [blame^] | 193 | const struct sh_dmae_pdata *pdata = shdev->pdata; |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 194 | int i; |
| 195 | |
| 196 | for (i = 0; i < pdata->ts_shift_num; i++) |
| 197 | if (pdata->ts_shift[i] == l2size) |
| 198 | break; |
| 199 | |
| 200 | if (i == pdata->ts_shift_num) |
| 201 | i = 0; |
| 202 | |
| 203 | return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) | |
| 204 | ((i << pdata->ts_high_shift) & pdata->ts_high_mask); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 205 | } |
| 206 | |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 207 | 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] | 208 | { |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 209 | sh_dmae_writel(sh_chan, hw->sar, SAR); |
| 210 | sh_dmae_writel(sh_chan, hw->dar, DAR); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 211 | sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | static void dmae_start(struct sh_dmae_chan *sh_chan) |
| 215 | { |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 216 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 217 | u32 chcr = chcr_read(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 218 | |
Kuninori Morimoto | 260bf2c | 2011-06-17 08:21:05 +0000 | [diff] [blame] | 219 | if (shdev->pdata->needs_tend_set) |
| 220 | sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND); |
| 221 | |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 222 | chcr |= CHCR_DE | shdev->chcr_ie_bit; |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 223 | chcr_write(sh_chan, chcr & ~CHCR_TE); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 224 | } |
| 225 | |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 226 | static void dmae_init(struct sh_dmae_chan *sh_chan) |
| 227 | { |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 228 | /* |
| 229 | * Default configuration for dual address memory-memory transfer. |
| 230 | * 0x400 represents auto-request. |
| 231 | */ |
| 232 | u32 chcr = DM_INC | SM_INC | 0x400 | log2size_to_chcr(sh_chan, |
| 233 | LOG2_DEFAULT_XFER_SIZE); |
| 234 | sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 235 | chcr_write(sh_chan, chcr); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 236 | } |
| 237 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 238 | static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) |
| 239 | { |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 240 | /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */ |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 241 | if (dmae_is_busy(sh_chan)) |
| 242 | return -EBUSY; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 243 | |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 244 | sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val); |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 245 | chcr_write(sh_chan, val); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 246 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 247 | return 0; |
| 248 | } |
| 249 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 250 | static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) |
| 251 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 252 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 2833c47 | 2013-08-02 16:18:09 +0200 | [diff] [blame^] | 253 | const struct sh_dmae_pdata *pdata = shdev->pdata; |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 254 | const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id]; |
Guennadi Liakhovetski | 115357e | 2013-07-02 17:46:01 +0200 | [diff] [blame] | 255 | void __iomem *addr = shdev->dmars; |
Kuninori Morimoto | 090b918 | 2011-06-16 05:08:28 +0000 | [diff] [blame] | 256 | unsigned int shift = chan_pdata->dmars_bit; |
Guennadi Liakhovetski | fc46185 | 2010-01-19 07:24:55 +0000 | [diff] [blame] | 257 | |
| 258 | if (dmae_is_busy(sh_chan)) |
| 259 | return -EBUSY; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 260 | |
Kuninori Morimoto | 260bf2c | 2011-06-17 08:21:05 +0000 | [diff] [blame] | 261 | if (pdata->no_dmars) |
| 262 | return 0; |
| 263 | |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 264 | /* in the case of a missing DMARS resource use first memory window */ |
| 265 | if (!addr) |
Guennadi Liakhovetski | 115357e | 2013-07-02 17:46:01 +0200 | [diff] [blame] | 266 | addr = shdev->chan_reg; |
| 267 | addr += chan_pdata->dmars; |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 268 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 269 | __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift), |
| 270 | addr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 275 | static void sh_dmae_start_xfer(struct shdma_chan *schan, |
| 276 | struct shdma_desc *sdesc) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 277 | { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 278 | struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, |
| 279 | shdma_chan); |
| 280 | struct sh_dmae_desc *sh_desc = container_of(sdesc, |
| 281 | struct sh_dmae_desc, shdma_desc); |
| 282 | dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n", |
| 283 | sdesc->async_tx.cookie, sh_chan->shdma_chan.id, |
| 284 | sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar); |
| 285 | /* Get the ld start address from ld_queue */ |
| 286 | dmae_set_reg(sh_chan, &sh_desc->hw); |
| 287 | dmae_start(sh_chan); |
| 288 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 289 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 290 | static bool sh_dmae_channel_busy(struct shdma_chan *schan) |
| 291 | { |
| 292 | struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, |
| 293 | shdma_chan); |
| 294 | return dmae_is_busy(sh_chan); |
| 295 | } |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 296 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 297 | static void sh_dmae_setup_xfer(struct shdma_chan *schan, |
Guennadi Liakhovetski | c2cdb7e | 2012-07-05 12:29:41 +0200 | [diff] [blame] | 298 | int slave_id) |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 299 | { |
| 300 | struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, |
| 301 | shdma_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 302 | |
Guennadi Liakhovetski | c2cdb7e | 2012-07-05 12:29:41 +0200 | [diff] [blame] | 303 | if (slave_id >= 0) { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 304 | const struct sh_dmae_slave_config *cfg = |
Guennadi Liakhovetski | ecf90fb | 2012-07-05 12:29:40 +0200 | [diff] [blame] | 305 | sh_chan->config; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 306 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 307 | dmae_set_dmars(sh_chan, cfg->mid_rid); |
| 308 | dmae_set_chcr(sh_chan, cfg->chcr); |
Guennadi Liakhovetski | c11b46c32 | 2012-01-04 15:34:17 +0100 | [diff] [blame] | 309 | } else { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 310 | dmae_init(sh_chan); |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 311 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 312 | } |
| 313 | |
Guennadi Liakhovetski | 67eacc1 | 2013-06-18 18:16:57 +0200 | [diff] [blame] | 314 | /* |
| 315 | * Find a slave channel configuration from the contoller list by either a slave |
| 316 | * ID in the non-DT case, or by a MID/RID value in the DT case |
| 317 | */ |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 318 | static const struct sh_dmae_slave_config *dmae_find_slave( |
Guennadi Liakhovetski | 67eacc1 | 2013-06-18 18:16:57 +0200 | [diff] [blame] | 319 | struct sh_dmae_chan *sh_chan, int match) |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 320 | { |
Kuninori Morimoto | c4e0dd7 | 2011-06-16 05:08:09 +0000 | [diff] [blame] | 321 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
Guennadi Liakhovetski | 2833c47 | 2013-08-02 16:18:09 +0200 | [diff] [blame^] | 322 | const struct sh_dmae_pdata *pdata = shdev->pdata; |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 323 | const struct sh_dmae_slave_config *cfg; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 324 | int i; |
| 325 | |
Guennadi Liakhovetski | 67eacc1 | 2013-06-18 18:16:57 +0200 | [diff] [blame] | 326 | if (!sh_chan->shdma_chan.dev->of_node) { |
| 327 | if (match >= SH_DMA_SLAVE_NUMBER) |
| 328 | return NULL; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 329 | |
Guennadi Liakhovetski | 67eacc1 | 2013-06-18 18:16:57 +0200 | [diff] [blame] | 330 | for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) |
| 331 | if (cfg->slave_id == match) |
| 332 | return cfg; |
| 333 | } else { |
| 334 | for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) |
| 335 | if (cfg->mid_rid == match) { |
| 336 | sh_chan->shdma_chan.slave_id = cfg->slave_id; |
| 337 | return cfg; |
| 338 | } |
| 339 | } |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 340 | |
| 341 | return NULL; |
| 342 | } |
| 343 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 344 | static int sh_dmae_set_slave(struct shdma_chan *schan, |
Guennadi Liakhovetski | 1ff8df4 | 2012-07-05 12:29:42 +0200 | [diff] [blame] | 345 | int slave_id, bool try) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 346 | { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 347 | struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, |
| 348 | shdma_chan); |
Guennadi Liakhovetski | c2cdb7e | 2012-07-05 12:29:41 +0200 | [diff] [blame] | 349 | const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id); |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 350 | if (!cfg) |
Guennadi Liakhovetski | 7c1119b | 2012-11-28 06:49:47 +0000 | [diff] [blame] | 351 | return -ENXIO; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 352 | |
Guennadi Liakhovetski | 1ff8df4 | 2012-07-05 12:29:42 +0200 | [diff] [blame] | 353 | if (!try) |
| 354 | sh_chan->config = cfg; |
Linus Walleij | c3635c7 | 2010-03-26 16:44:01 -0700 | [diff] [blame] | 355 | |
| 356 | return 0; |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 357 | } |
| 358 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 359 | static void dmae_halt(struct sh_dmae_chan *sh_chan) |
Guennadi Liakhovetski | 3542a11 | 2009-12-17 09:41:39 -0700 | [diff] [blame] | 360 | { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 361 | struct sh_dmae_device *shdev = to_sh_dev(sh_chan); |
| 362 | u32 chcr = chcr_read(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 363 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 364 | chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit); |
| 365 | chcr_write(sh_chan, chcr); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 366 | } |
| 367 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 368 | static int sh_dmae_desc_setup(struct shdma_chan *schan, |
| 369 | struct shdma_desc *sdesc, |
| 370 | dma_addr_t src, dma_addr_t dst, size_t *len) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 371 | { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 372 | struct sh_dmae_desc *sh_desc = container_of(sdesc, |
| 373 | struct sh_dmae_desc, shdma_desc); |
| 374 | |
| 375 | if (*len > schan->max_xfer_len) |
| 376 | *len = schan->max_xfer_len; |
| 377 | |
| 378 | sh_desc->hw.sar = src; |
| 379 | sh_desc->hw.dar = dst; |
| 380 | sh_desc->hw.tcr = *len; |
| 381 | |
| 382 | return 0; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 383 | } |
| 384 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 385 | static void sh_dmae_halt(struct shdma_chan *schan) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 386 | { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 387 | struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, |
| 388 | shdma_chan); |
| 389 | dmae_halt(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 390 | } |
| 391 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 392 | static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 393 | { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 394 | struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, |
| 395 | shdma_chan); |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 396 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 397 | if (!(chcr_read(sh_chan) & CHCR_TE)) |
| 398 | return false; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 399 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 400 | /* DMA stop */ |
| 401 | dmae_halt(sh_chan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 402 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 403 | return true; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 404 | } |
| 405 | |
Guennadi Liakhovetski | 4f46f8a | 2012-07-30 21:28:27 +0200 | [diff] [blame] | 406 | static size_t sh_dmae_get_partial(struct shdma_chan *schan, |
| 407 | struct shdma_desc *sdesc) |
| 408 | { |
| 409 | struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, |
| 410 | shdma_chan); |
| 411 | struct sh_dmae_desc *sh_desc = container_of(sdesc, |
| 412 | struct sh_dmae_desc, shdma_desc); |
| 413 | return (sh_desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) << |
| 414 | sh_chan->xmit_shift; |
| 415 | } |
| 416 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 417 | /* Called from error IRQ or NMI */ |
| 418 | static bool sh_dmae_reset(struct sh_dmae_device *shdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 419 | { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 420 | bool ret; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 421 | |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 422 | /* halt the dma controller */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 423 | sh_dmae_ctl_stop(shdev); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 424 | |
| 425 | /* We cannot detect, which channel caused the error, have to reset all */ |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 426 | ret = shdma_reset(&shdev->shdma_dev); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 427 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 428 | sh_dmae_rst(shdev); |
Guennadi Liakhovetski | 47a4dc2 | 2010-02-11 16:50:05 +0000 | [diff] [blame] | 429 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 430 | return ret; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 431 | } |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 432 | |
| 433 | static irqreturn_t sh_dmae_err(int irq, void *data) |
| 434 | { |
Yoshihiro Shimoda | ff7690b | 2011-02-09 07:46:47 +0000 | [diff] [blame] | 435 | struct sh_dmae_device *shdev = data; |
| 436 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 437 | if (!(dmaor_read(shdev) & DMAOR_AE)) |
Yoshihiro Shimoda | ff7690b | 2011-02-09 07:46:47 +0000 | [diff] [blame] | 438 | return IRQ_NONE; |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 439 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 440 | sh_dmae_reset(shdev); |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 441 | return IRQ_HANDLED; |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 442 | } |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 443 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 444 | static bool sh_dmae_desc_completed(struct shdma_chan *schan, |
| 445 | struct shdma_desc *sdesc) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 446 | { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 447 | struct sh_dmae_chan *sh_chan = container_of(schan, |
| 448 | struct sh_dmae_chan, shdma_chan); |
| 449 | struct sh_dmae_desc *sh_desc = container_of(sdesc, |
| 450 | struct sh_dmae_desc, shdma_desc); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 451 | u32 sar_buf = sh_dmae_readl(sh_chan, SAR); |
Guennadi Liakhovetski | cfefe99 | 2010-02-03 14:46:41 +0000 | [diff] [blame] | 452 | u32 dar_buf = sh_dmae_readl(sh_chan, DAR); |
Guennadi Liakhovetski | 86d61b3 | 2009-12-10 18:35:07 +0100 | [diff] [blame] | 453 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 454 | return (sdesc->direction == DMA_DEV_TO_MEM && |
| 455 | (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) || |
| 456 | (sdesc->direction != DMA_DEV_TO_MEM && |
| 457 | (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 458 | } |
| 459 | |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 460 | static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev) |
| 461 | { |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 462 | /* Fast path out if NMIF is not asserted for this controller */ |
| 463 | if ((dmaor_read(shdev) & DMAOR_NMIF) == 0) |
| 464 | return false; |
| 465 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 466 | return sh_dmae_reset(shdev); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 467 | } |
| 468 | |
| 469 | static int sh_dmae_nmi_handler(struct notifier_block *self, |
| 470 | unsigned long cmd, void *data) |
| 471 | { |
| 472 | struct sh_dmae_device *shdev; |
| 473 | int ret = NOTIFY_DONE; |
| 474 | bool triggered; |
| 475 | |
| 476 | /* |
| 477 | * Only concern ourselves with NMI events. |
| 478 | * |
| 479 | * Normally we would check the die chain value, but as this needs |
| 480 | * to be architecture independent, check for NMI context instead. |
| 481 | */ |
| 482 | if (!in_nmi()) |
| 483 | return NOTIFY_DONE; |
| 484 | |
| 485 | rcu_read_lock(); |
| 486 | list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) { |
| 487 | /* |
| 488 | * Only stop if one of the controllers has NMIF asserted, |
| 489 | * we do not want to interfere with regular address error |
| 490 | * handling or NMI events that don't concern the DMACs. |
| 491 | */ |
| 492 | triggered = sh_dmae_nmi_notify(shdev); |
| 493 | if (triggered == true) |
| 494 | ret = NOTIFY_OK; |
| 495 | } |
| 496 | rcu_read_unlock(); |
| 497 | |
| 498 | return ret; |
| 499 | } |
| 500 | |
| 501 | static struct notifier_block sh_dmae_nmi_notifier __read_mostly = { |
| 502 | .notifier_call = sh_dmae_nmi_handler, |
| 503 | |
| 504 | /* Run before NMI debug handler and KGDB */ |
| 505 | .priority = 1, |
| 506 | }; |
| 507 | |
Bill Pemberton | 463a1f8 | 2012-11-19 13:22:55 -0500 | [diff] [blame] | 508 | static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id, |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 509 | int irq, unsigned long flags) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 510 | { |
Guennadi Liakhovetski | 5bac942 | 2010-04-21 15:36:49 +0000 | [diff] [blame] | 511 | const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id]; |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 512 | struct shdma_dev *sdev = &shdev->shdma_dev; |
| 513 | struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev); |
| 514 | struct sh_dmae_chan *sh_chan; |
| 515 | struct shdma_chan *schan; |
| 516 | int err; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 517 | |
Guennadi Liakhovetski | c1c63a1 | 2013-07-02 17:45:55 +0200 | [diff] [blame] | 518 | sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan), |
| 519 | GFP_KERNEL); |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 520 | if (!sh_chan) { |
| 521 | dev_err(sdev->dma_dev.dev, |
Guennadi Liakhovetski | 86d61b3 | 2009-12-10 18:35:07 +0100 | [diff] [blame] | 522 | "No free memory for allocating dma channels!\n"); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 523 | return -ENOMEM; |
| 524 | } |
| 525 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 526 | schan = &sh_chan->shdma_chan; |
| 527 | schan->max_xfer_len = SH_DMA_TCR_MAX + 1; |
Guennadi Liakhovetski | 7a1cd9a | 2011-08-18 16:55:27 +0200 | [diff] [blame] | 528 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 529 | shdma_chan_probe(sdev, schan, id); |
Guennadi Liakhovetski | 8b1935e | 2010-02-11 16:50:14 +0000 | [diff] [blame] | 530 | |
Guennadi Liakhovetski | 115357e | 2013-07-02 17:46:01 +0200 | [diff] [blame] | 531 | sh_chan->base = shdev->chan_reg + chan_pdata->offset; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 532 | |
| 533 | /* set up channel irq */ |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 534 | if (pdev->id >= 0) |
| 535 | snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), |
| 536 | "sh-dmae%d.%d", pdev->id, id); |
| 537 | else |
| 538 | snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), |
| 539 | "sh-dma%d", id); |
| 540 | |
| 541 | err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 542 | if (err) { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 543 | dev_err(sdev->dma_dev.dev, |
| 544 | "DMA channel %d request_irq error %d\n", |
| 545 | id, err); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 546 | goto err_no_irq; |
| 547 | } |
| 548 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 549 | shdev->chan[id] = sh_chan; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 550 | return 0; |
| 551 | |
| 552 | err_no_irq: |
| 553 | /* remove from dmaengine device node */ |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 554 | shdma_chan_remove(schan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 555 | return err; |
| 556 | } |
| 557 | |
| 558 | static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) |
| 559 | { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 560 | struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; |
| 561 | struct shdma_chan *schan; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 562 | int i; |
| 563 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 564 | shdma_for_each_chan(schan, &shdev->shdma_dev, i) { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 565 | BUG_ON(!schan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 566 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 567 | shdma_chan_remove(schan); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 568 | } |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 569 | dma_dev->chancnt = 0; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 570 | } |
| 571 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 572 | static void sh_dmae_shutdown(struct platform_device *pdev) |
| 573 | { |
| 574 | struct sh_dmae_device *shdev = platform_get_drvdata(pdev); |
| 575 | sh_dmae_ctl_stop(shdev); |
| 576 | } |
| 577 | |
| 578 | static int sh_dmae_runtime_suspend(struct device *dev) |
| 579 | { |
| 580 | return 0; |
| 581 | } |
| 582 | |
| 583 | static int sh_dmae_runtime_resume(struct device *dev) |
| 584 | { |
| 585 | struct sh_dmae_device *shdev = dev_get_drvdata(dev); |
| 586 | |
| 587 | return sh_dmae_rst(shdev); |
| 588 | } |
| 589 | |
| 590 | #ifdef CONFIG_PM |
| 591 | static int sh_dmae_suspend(struct device *dev) |
| 592 | { |
| 593 | return 0; |
| 594 | } |
| 595 | |
| 596 | static int sh_dmae_resume(struct device *dev) |
| 597 | { |
| 598 | struct sh_dmae_device *shdev = dev_get_drvdata(dev); |
| 599 | int i, ret; |
| 600 | |
| 601 | ret = sh_dmae_rst(shdev); |
| 602 | if (ret < 0) |
| 603 | dev_err(dev, "Failed to reset!\n"); |
| 604 | |
| 605 | for (i = 0; i < shdev->pdata->channel_num; i++) { |
| 606 | struct sh_dmae_chan *sh_chan = shdev->chan[i]; |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 607 | |
| 608 | if (!sh_chan->shdma_chan.desc_num) |
| 609 | continue; |
| 610 | |
Guennadi Liakhovetski | c2cdb7e | 2012-07-05 12:29:41 +0200 | [diff] [blame] | 611 | if (sh_chan->shdma_chan.slave_id >= 0) { |
Guennadi Liakhovetski | ecf90fb | 2012-07-05 12:29:40 +0200 | [diff] [blame] | 612 | const struct sh_dmae_slave_config *cfg = sh_chan->config; |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 613 | dmae_set_dmars(sh_chan, cfg->mid_rid); |
| 614 | dmae_set_chcr(sh_chan, cfg->chcr); |
| 615 | } else { |
| 616 | dmae_init(sh_chan); |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | return 0; |
| 621 | } |
| 622 | #else |
| 623 | #define sh_dmae_suspend NULL |
| 624 | #define sh_dmae_resume NULL |
| 625 | #endif |
| 626 | |
| 627 | const struct dev_pm_ops sh_dmae_pm = { |
| 628 | .suspend = sh_dmae_suspend, |
| 629 | .resume = sh_dmae_resume, |
| 630 | .runtime_suspend = sh_dmae_runtime_suspend, |
| 631 | .runtime_resume = sh_dmae_runtime_resume, |
| 632 | }; |
| 633 | |
| 634 | static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan) |
| 635 | { |
Guennadi Liakhovetski | ecf90fb | 2012-07-05 12:29:40 +0200 | [diff] [blame] | 636 | struct sh_dmae_chan *sh_chan = container_of(schan, |
| 637 | struct sh_dmae_chan, shdma_chan); |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 638 | |
| 639 | /* |
Guennadi Liakhovetski | ecf90fb | 2012-07-05 12:29:40 +0200 | [diff] [blame] | 640 | * Implicit BUG_ON(!sh_chan->config) |
| 641 | * This is an exclusive slave DMA operation, may only be called after a |
| 642 | * successful slave configuration. |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 643 | */ |
Guennadi Liakhovetski | ecf90fb | 2012-07-05 12:29:40 +0200 | [diff] [blame] | 644 | return sh_chan->config->addr; |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 645 | } |
| 646 | |
| 647 | static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i) |
| 648 | { |
| 649 | return &((struct sh_dmae_desc *)buf)[i].shdma_desc; |
| 650 | } |
| 651 | |
| 652 | static const struct shdma_ops sh_dmae_shdma_ops = { |
| 653 | .desc_completed = sh_dmae_desc_completed, |
| 654 | .halt_channel = sh_dmae_halt, |
| 655 | .channel_busy = sh_dmae_channel_busy, |
| 656 | .slave_addr = sh_dmae_slave_addr, |
| 657 | .desc_setup = sh_dmae_desc_setup, |
| 658 | .set_slave = sh_dmae_set_slave, |
| 659 | .setup_xfer = sh_dmae_setup_xfer, |
| 660 | .start_xfer = sh_dmae_start_xfer, |
| 661 | .embedded_desc = sh_dmae_embedded_desc, |
| 662 | .chan_irq = sh_dmae_chan_irq, |
Guennadi Liakhovetski | 4f46f8a | 2012-07-30 21:28:27 +0200 | [diff] [blame] | 663 | .get_partial = sh_dmae_get_partial, |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 664 | }; |
| 665 | |
Bill Pemberton | 463a1f8 | 2012-11-19 13:22:55 -0500 | [diff] [blame] | 666 | static int sh_dmae_probe(struct platform_device *pdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 667 | { |
Guennadi Liakhovetski | 2833c47 | 2013-08-02 16:18:09 +0200 | [diff] [blame^] | 668 | const struct sh_dmae_pdata *pdata = pdev->dev.platform_data; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 669 | unsigned long irqflags = IRQF_DISABLED, |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 670 | chan_flag[SH_DMAE_MAX_CHANNELS] = {}; |
| 671 | int errirq, chan_irq[SH_DMAE_MAX_CHANNELS]; |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 672 | int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 673 | struct sh_dmae_device *shdev; |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 674 | struct dma_device *dma_dev; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 675 | struct resource *chan, *dmars, *errirq_res, *chanirq_res; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 676 | |
Dan Williams | 56adf7e | 2009-11-22 12:10:10 -0700 | [diff] [blame] | 677 | /* get platform data */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 678 | if (!pdata || !pdata->channel_num) |
Dan Williams | 56adf7e | 2009-11-22 12:10:10 -0700 | [diff] [blame] | 679 | return -ENODEV; |
| 680 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 681 | chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Magnus Damm | 26fc02a | 2011-05-24 10:31:12 +0000 | [diff] [blame] | 682 | /* DMARS area is optional */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 683 | dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 684 | /* |
| 685 | * IRQ resources: |
| 686 | * 1. there always must be at least one IRQ IO-resource. On SH4 it is |
| 687 | * the error IRQ, in which case it is the only IRQ in this resource: |
| 688 | * start == end. If it is the only IRQ resource, all channels also |
| 689 | * use the same IRQ. |
| 690 | * 2. DMA channel IRQ resources can be specified one per resource or in |
| 691 | * ranges (start != end) |
| 692 | * 3. iff all events (channels and, optionally, error) on this |
| 693 | * controller use the same IRQ, only one IRQ resource can be |
| 694 | * specified, otherwise there must be one IRQ per channel, even if |
| 695 | * some of them are equal |
| 696 | * 4. if all IRQs on this controller are equal or if some specific IRQs |
| 697 | * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be |
| 698 | * requested with the IRQF_SHARED flag |
| 699 | */ |
| 700 | errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| 701 | if (!chan || !errirq_res) |
| 702 | return -ENODEV; |
| 703 | |
Guennadi Liakhovetski | c1c63a1 | 2013-07-02 17:45:55 +0200 | [diff] [blame] | 704 | shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device), |
| 705 | GFP_KERNEL); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 706 | if (!shdev) { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 707 | dev_err(&pdev->dev, "Not enough memory\n"); |
Guennadi Liakhovetski | c1c63a1 | 2013-07-02 17:45:55 +0200 | [diff] [blame] | 708 | return -ENOMEM; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 709 | } |
| 710 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 711 | dma_dev = &shdev->shdma_dev.dma_dev; |
| 712 | |
Guennadi Liakhovetski | c1c63a1 | 2013-07-02 17:45:55 +0200 | [diff] [blame] | 713 | shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan); |
| 714 | if (IS_ERR(shdev->chan_reg)) |
| 715 | return PTR_ERR(shdev->chan_reg); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 716 | if (dmars) { |
Guennadi Liakhovetski | c1c63a1 | 2013-07-02 17:45:55 +0200 | [diff] [blame] | 717 | shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars); |
| 718 | if (IS_ERR(shdev->dmars)) |
| 719 | return PTR_ERR(shdev->dmars); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 720 | } |
| 721 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 722 | if (!pdata->slave_only) |
| 723 | dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); |
| 724 | if (pdata->slave && pdata->slave_num) |
| 725 | dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); |
| 726 | |
| 727 | /* Default transfer size of 32 bytes requires 32-byte alignment */ |
| 728 | dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE; |
| 729 | |
| 730 | shdev->shdma_dev.ops = &sh_dmae_shdma_ops; |
| 731 | shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc); |
| 732 | err = shdma_init(&pdev->dev, &shdev->shdma_dev, |
| 733 | pdata->channel_num); |
| 734 | if (err < 0) |
| 735 | goto eshdma; |
| 736 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 737 | /* platform data */ |
Guennadi Liakhovetski | fa74326 | 2013-06-06 17:37:13 +0200 | [diff] [blame] | 738 | shdev->pdata = pdata; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 739 | |
Kuninori Morimoto | 5899a72 | 2011-06-17 08:20:40 +0000 | [diff] [blame] | 740 | if (pdata->chcr_offset) |
| 741 | shdev->chcr_offset = pdata->chcr_offset; |
| 742 | else |
| 743 | shdev->chcr_offset = CHCR; |
| 744 | |
Kuninori Morimoto | 67c6269 | 2011-06-17 08:20:51 +0000 | [diff] [blame] | 745 | if (pdata->chcr_ie_bit) |
| 746 | shdev->chcr_ie_bit = pdata->chcr_ie_bit; |
| 747 | else |
| 748 | shdev->chcr_ie_bit = CHCR_IE; |
| 749 | |
Paul Mundt | 5c2de44 | 2011-05-31 15:53:03 +0900 | [diff] [blame] | 750 | platform_set_drvdata(pdev, shdev); |
| 751 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 752 | pm_runtime_enable(&pdev->dev); |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 753 | err = pm_runtime_get_sync(&pdev->dev); |
| 754 | if (err < 0) |
| 755 | dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err); |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 756 | |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 757 | spin_lock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 758 | list_add_tail_rcu(&shdev->node, &sh_dmae_devices); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 759 | spin_unlock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 760 | |
Guennadi Liakhovetski | 2dc6666 | 2011-04-29 17:09:21 +0000 | [diff] [blame] | 761 | /* reset dma controller - only needed as a test */ |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 762 | err = sh_dmae_rst(shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 763 | if (err) |
| 764 | goto rst_err; |
| 765 | |
Magnus Damm | 927a7c9 | 2010-03-19 04:47:19 +0000 | [diff] [blame] | 766 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 767 | chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); |
| 768 | |
| 769 | if (!chanirq_res) |
| 770 | chanirq_res = errirq_res; |
| 771 | else |
| 772 | irqres++; |
| 773 | |
| 774 | if (chanirq_res == errirq_res || |
| 775 | (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 776 | irqflags = IRQF_SHARED; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 777 | |
| 778 | errirq = errirq_res->start; |
| 779 | |
Guennadi Liakhovetski | c1c63a1 | 2013-07-02 17:45:55 +0200 | [diff] [blame] | 780 | err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err, irqflags, |
| 781 | "DMAC Address Error", shdev); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 782 | if (err) { |
| 783 | dev_err(&pdev->dev, |
| 784 | "DMA failed requesting irq #%d, error %d\n", |
| 785 | errirq, err); |
| 786 | goto eirq_err; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 787 | } |
| 788 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 789 | #else |
| 790 | chanirq_res = errirq_res; |
Magnus Damm | 927a7c9 | 2010-03-19 04:47:19 +0000 | [diff] [blame] | 791 | #endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */ |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 792 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 793 | if (chanirq_res->start == chanirq_res->end && |
| 794 | !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { |
| 795 | /* Special case - all multiplexed */ |
| 796 | for (; irq_cnt < pdata->channel_num; irq_cnt++) { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 797 | if (irq_cnt < SH_DMAE_MAX_CHANNELS) { |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 798 | chan_irq[irq_cnt] = chanirq_res->start; |
| 799 | chan_flag[irq_cnt] = IRQF_SHARED; |
| 800 | } else { |
| 801 | irq_cap = 1; |
| 802 | break; |
| 803 | } |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 804 | } |
| 805 | } else { |
| 806 | do { |
| 807 | for (i = chanirq_res->start; i <= chanirq_res->end; i++) { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 808 | if (irq_cnt >= SH_DMAE_MAX_CHANNELS) { |
Magnus Damm | dcee0bb | 2011-06-09 06:35:08 +0000 | [diff] [blame] | 809 | irq_cap = 1; |
| 810 | break; |
| 811 | } |
| 812 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 813 | if ((errirq_res->flags & IORESOURCE_BITS) == |
| 814 | IORESOURCE_IRQ_SHAREABLE) |
| 815 | chan_flag[irq_cnt] = IRQF_SHARED; |
| 816 | else |
| 817 | chan_flag[irq_cnt] = IRQF_DISABLED; |
| 818 | dev_dbg(&pdev->dev, |
| 819 | "Found IRQ %d for channel %d\n", |
| 820 | i, irq_cnt); |
| 821 | chan_irq[irq_cnt++] = i; |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 822 | } |
| 823 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 824 | if (irq_cnt >= SH_DMAE_MAX_CHANNELS) |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 825 | break; |
Magnus Damm | dcee0bb | 2011-06-09 06:35:08 +0000 | [diff] [blame] | 826 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 827 | chanirq_res = platform_get_resource(pdev, |
| 828 | IORESOURCE_IRQ, ++irqres); |
| 829 | } while (irq_cnt < pdata->channel_num && chanirq_res); |
| 830 | } |
| 831 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 832 | /* Create DMA Channel */ |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 833 | for (i = 0; i < irq_cnt; i++) { |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 834 | 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] | 835 | if (err) |
| 836 | goto chan_probe_err; |
| 837 | } |
| 838 | |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 839 | if (irq_cap) |
| 840 | dev_notice(&pdev->dev, "Attempting to register %d DMA " |
| 841 | "channels when a maximum of %d are supported.\n", |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 842 | pdata->channel_num, SH_DMAE_MAX_CHANNELS); |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 843 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 844 | pm_runtime_put(&pdev->dev); |
| 845 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 846 | err = dma_async_device_register(&shdev->shdma_dev.dma_dev); |
| 847 | if (err < 0) |
| 848 | goto edmadevreg; |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 849 | |
| 850 | return err; |
| 851 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 852 | edmadevreg: |
| 853 | pm_runtime_get(&pdev->dev); |
| 854 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 855 | chan_probe_err: |
| 856 | sh_dmae_chan_remove(shdev); |
Magnus Damm | 300e5f9 | 2011-05-24 10:31:20 +0000 | [diff] [blame] | 857 | |
Magnus Damm | 927a7c9 | 2010-03-19 04:47:19 +0000 | [diff] [blame] | 858 | #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 859 | eirq_err: |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 860 | #endif |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 861 | rst_err: |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 862 | spin_lock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 863 | list_del_rcu(&shdev->node); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 864 | spin_unlock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 865 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 866 | pm_runtime_put(&pdev->dev); |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 867 | pm_runtime_disable(&pdev->dev); |
| 868 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 869 | platform_set_drvdata(pdev, NULL); |
| 870 | shdma_cleanup(&shdev->shdma_dev); |
| 871 | eshdma: |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 872 | synchronize_rcu(); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 873 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 874 | return err; |
| 875 | } |
| 876 | |
Greg Kroah-Hartman | 4bf27b8 | 2012-12-21 15:09:59 -0800 | [diff] [blame] | 877 | static int sh_dmae_remove(struct platform_device *pdev) |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 878 | { |
| 879 | struct sh_dmae_device *shdev = platform_get_drvdata(pdev); |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 880 | struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 881 | struct resource *res; |
| 882 | int errirq = platform_get_irq(pdev, 0); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 883 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 884 | dma_async_device_unregister(dma_dev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 885 | |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 886 | if (errirq > 0) |
| 887 | free_irq(errirq, shdev); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 888 | |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 889 | spin_lock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 890 | list_del_rcu(&shdev->node); |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 891 | spin_unlock_irq(&sh_dmae_lock); |
Paul Mundt | 03aa18f | 2010-12-17 19:16:10 +0900 | [diff] [blame] | 892 | |
Guennadi Liakhovetski | 20f2a3b | 2010-02-11 16:50:18 +0000 | [diff] [blame] | 893 | pm_runtime_disable(&pdev->dev); |
| 894 | |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 895 | sh_dmae_chan_remove(shdev); |
| 896 | shdma_cleanup(&shdev->shdma_dev); |
| 897 | |
Paul Mundt | 5c2de44 | 2011-05-31 15:53:03 +0900 | [diff] [blame] | 898 | platform_set_drvdata(pdev, NULL); |
| 899 | |
Guennadi Liakhovetski | 31705e2 | 2011-05-02 07:59:02 +0000 | [diff] [blame] | 900 | synchronize_rcu(); |
Guennadi Liakhovetski | 027811b | 2010-02-11 16:50:10 +0000 | [diff] [blame] | 901 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 902 | return 0; |
| 903 | } |
| 904 | |
Guennadi Liakhovetski | 67eacc1 | 2013-06-18 18:16:57 +0200 | [diff] [blame] | 905 | static const struct of_device_id sh_dmae_of_match[] = { |
| 906 | { .compatible = "renesas,shdma", }, |
| 907 | { } |
| 908 | }; |
| 909 | MODULE_DEVICE_TABLE(of, sh_dmae_of_match); |
| 910 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 911 | static struct platform_driver sh_dmae_driver = { |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 912 | .driver = { |
Guennadi Liakhovetski | 7a5c106 | 2010-05-21 15:28:51 +0000 | [diff] [blame] | 913 | .owner = THIS_MODULE, |
Guennadi Liakhovetski | 467017b | 2011-04-29 17:09:25 +0000 | [diff] [blame] | 914 | .pm = &sh_dmae_pm, |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 915 | .name = SH_DMAE_DRV_NAME, |
Guennadi Liakhovetski | 67eacc1 | 2013-06-18 18:16:57 +0200 | [diff] [blame] | 916 | .of_match_table = sh_dmae_of_match, |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 917 | }, |
Bill Pemberton | a7d6e3e | 2012-11-19 13:20:04 -0500 | [diff] [blame] | 918 | .remove = sh_dmae_remove, |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 919 | .shutdown = sh_dmae_shutdown, |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 920 | }; |
| 921 | |
| 922 | static int __init sh_dmae_init(void) |
| 923 | { |
Guennadi Liakhovetski | 661382f | 2011-01-06 17:04:50 +0000 | [diff] [blame] | 924 | /* Wire up NMI handling */ |
| 925 | int err = register_die_notifier(&sh_dmae_nmi_notifier); |
| 926 | if (err) |
| 927 | return err; |
| 928 | |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 929 | return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); |
| 930 | } |
| 931 | module_init(sh_dmae_init); |
| 932 | |
| 933 | static void __exit sh_dmae_exit(void) |
| 934 | { |
| 935 | platform_driver_unregister(&sh_dmae_driver); |
Guennadi Liakhovetski | 661382f | 2011-01-06 17:04:50 +0000 | [diff] [blame] | 936 | |
| 937 | unregister_die_notifier(&sh_dmae_nmi_notifier); |
Nobuhiro Iwamatsu | d8902ad | 2009-09-07 03:26:23 +0000 | [diff] [blame] | 938 | } |
| 939 | module_exit(sh_dmae_exit); |
| 940 | |
| 941 | MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>"); |
| 942 | MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); |
| 943 | MODULE_LICENSE("GPL"); |
Guennadi Liakhovetski | ce3a1ab | 2012-05-09 17:09:21 +0200 | [diff] [blame] | 944 | MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME); |