Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2006 ARM Ltd. |
| 3 | * Copyright (c) 2010 ST-Ericsson SA |
| 4 | * |
| 5 | * Author: Peter Pearse <peter.pearse@arm.com> |
| 6 | * Author: Linus Walleij <linus.walleij@stericsson.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License as published by the Free |
| 10 | * Software Foundation; either version 2 of the License, or (at your option) |
| 11 | * any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 16 | * more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along with |
| 19 | * this program; if not, write to the Free Software Foundation, Inc., 59 |
| 20 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 21 | * |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 22 | * The full GNU General Public License is in this distribution in the file |
| 23 | * called COPYING. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 24 | * |
| 25 | * Documentation: ARM DDI 0196G == PL080 |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 26 | * Documentation: ARM DDI 0218E == PL081 |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 27 | * |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 28 | * PL080 & PL081 both have 16 sets of DMA signals that can be routed to any |
| 29 | * channel. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 30 | * |
| 31 | * The PL080 has 8 channels available for simultaneous use, and the PL081 |
| 32 | * has only two channels. So on these DMA controllers the number of channels |
| 33 | * and the number of incoming DMA signals are two totally different things. |
| 34 | * It is usually not possible to theoretically handle all physical signals, |
| 35 | * so a multiplexing scheme with possible denial of use is necessary. |
| 36 | * |
| 37 | * The PL080 has a dual bus master, PL081 has a single master. |
| 38 | * |
| 39 | * Memory to peripheral transfer may be visualized as |
| 40 | * Get data from memory to DMAC |
| 41 | * Until no data left |
| 42 | * On burst request from peripheral |
| 43 | * Destination burst from DMAC to peripheral |
| 44 | * Clear burst request |
| 45 | * Raise terminal count interrupt |
| 46 | * |
| 47 | * For peripherals with a FIFO: |
| 48 | * Source burst size == half the depth of the peripheral FIFO |
| 49 | * Destination burst size == the depth of the peripheral FIFO |
| 50 | * |
| 51 | * (Bursts are irrelevant for mem to mem transfers - there are no burst |
| 52 | * signals, the DMA controller will simply facilitate its AHB master.) |
| 53 | * |
| 54 | * ASSUMES default (little) endianness for DMA transfers |
| 55 | * |
Russell King - ARM Linux | 9dc2c20 | 2011-01-03 22:33:06 +0000 | [diff] [blame] | 56 | * The PL08x has two flow control settings: |
| 57 | * - DMAC flow control: the transfer size defines the number of transfers |
| 58 | * which occur for the current LLI entry, and the DMAC raises TC at the |
| 59 | * end of every LLI entry. Observed behaviour shows the DMAC listening |
| 60 | * to both the BREQ and SREQ signals (contrary to documented), |
| 61 | * transferring data if either is active. The LBREQ and LSREQ signals |
| 62 | * are ignored. |
| 63 | * |
| 64 | * - Peripheral flow control: the transfer size is ignored (and should be |
| 65 | * zero). The data is transferred from the current LLI entry, until |
| 66 | * after the final transfer signalled by LBREQ or LSREQ. The DMAC |
| 67 | * will then move to the next LLI entry. |
| 68 | * |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 69 | * Global TODO: |
| 70 | * - Break out common code from arch/arm/mach-s3c64xx and share |
| 71 | */ |
Russell King - ARM Linux | 730404a | 2011-01-03 22:34:07 +0000 | [diff] [blame] | 72 | #include <linux/amba/bus.h> |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 73 | #include <linux/amba/pl08x.h> |
| 74 | #include <linux/debugfs.h> |
Viresh Kumar | 0c38d70 | 2011-08-05 15:32:28 +0530 | [diff] [blame] | 75 | #include <linux/delay.h> |
| 76 | #include <linux/device.h> |
| 77 | #include <linux/dmaengine.h> |
| 78 | #include <linux/dmapool.h> |
Vinod Koul | 8516f52 | 2011-09-02 16:43:44 +0530 | [diff] [blame^] | 79 | #include <linux/dma-mapping.h> |
Viresh Kumar | 0c38d70 | 2011-08-05 15:32:28 +0530 | [diff] [blame] | 80 | #include <linux/init.h> |
| 81 | #include <linux/interrupt.h> |
| 82 | #include <linux/module.h> |
Viresh Kumar | b7b6018 | 2011-08-05 15:32:33 +0530 | [diff] [blame] | 83 | #include <linux/pm_runtime.h> |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 84 | #include <linux/seq_file.h> |
Viresh Kumar | 0c38d70 | 2011-08-05 15:32:28 +0530 | [diff] [blame] | 85 | #include <linux/slab.h> |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 86 | #include <asm/hardware/pl080.h> |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 87 | |
| 88 | #define DRIVER_NAME "pl08xdmac" |
| 89 | |
| 90 | /** |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 91 | * struct vendor_data - vendor-specific config parameters for PL08x derivatives |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 92 | * @channels: the number of channels available in this variant |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 93 | * @dualmaster: whether this version supports dual AHB masters or not. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 94 | */ |
| 95 | struct vendor_data { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 96 | u8 channels; |
| 97 | bool dualmaster; |
| 98 | }; |
| 99 | |
| 100 | /* |
| 101 | * PL08X private data structures |
Russell King - ARM Linux | e8b5e11 | 2011-01-03 22:30:24 +0000 | [diff] [blame] | 102 | * An LLI struct - see PL08x TRM. Note that next uses bit[0] as a bus bit, |
Russell King - ARM Linux | e25761d | 2011-01-03 22:37:52 +0000 | [diff] [blame] | 103 | * start & end do not - their bus bit info is in cctl. Also note that these |
| 104 | * are fixed 32-bit quantities. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 105 | */ |
Russell King - ARM Linux | 7cb72ad | 2011-01-03 22:35:28 +0000 | [diff] [blame] | 106 | struct pl08x_lli { |
Russell King - ARM Linux | e25761d | 2011-01-03 22:37:52 +0000 | [diff] [blame] | 107 | u32 src; |
| 108 | u32 dst; |
Russell King - ARM Linux | bfddfb4 | 2011-01-03 22:38:12 +0000 | [diff] [blame] | 109 | u32 lli; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 110 | u32 cctl; |
| 111 | }; |
| 112 | |
| 113 | /** |
| 114 | * struct pl08x_driver_data - the local state holder for the PL08x |
| 115 | * @slave: slave engine for this instance |
| 116 | * @memcpy: memcpy engine for this instance |
| 117 | * @base: virtual memory base (remapped) for the PL08x |
| 118 | * @adev: the corresponding AMBA (PrimeCell) bus entry |
| 119 | * @vd: vendor data for this PL08x variant |
| 120 | * @pd: platform data passed in from the platform/machine |
| 121 | * @phy_chans: array of data for the physical channels |
| 122 | * @pool: a pool for the LLI descriptors |
| 123 | * @pool_ctr: counter of LLIs in the pool |
Viresh Kumar | 3e27ee8 | 2011-08-05 15:32:27 +0530 | [diff] [blame] | 124 | * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI |
| 125 | * fetches |
Russell King - ARM Linux | 30749cb | 2011-01-03 22:41:13 +0000 | [diff] [blame] | 126 | * @mem_buses: set to indicate memory transfers on AHB2. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 127 | * @lock: a spinlock for this struct |
| 128 | */ |
| 129 | struct pl08x_driver_data { |
| 130 | struct dma_device slave; |
| 131 | struct dma_device memcpy; |
| 132 | void __iomem *base; |
| 133 | struct amba_device *adev; |
Russell King - ARM Linux | f96ca9e | 2011-01-03 22:35:08 +0000 | [diff] [blame] | 134 | const struct vendor_data *vd; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 135 | struct pl08x_platform_data *pd; |
| 136 | struct pl08x_phy_chan *phy_chans; |
| 137 | struct dma_pool *pool; |
| 138 | int pool_ctr; |
Russell King - ARM Linux | 30749cb | 2011-01-03 22:41:13 +0000 | [diff] [blame] | 139 | u8 lli_buses; |
| 140 | u8 mem_buses; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 141 | spinlock_t lock; |
| 142 | }; |
| 143 | |
| 144 | /* |
| 145 | * PL08X specific defines |
| 146 | */ |
| 147 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 148 | /* Size (bytes) of each LLI buffer allocated for one transfer */ |
| 149 | # define PL08X_LLI_TSFR_SIZE 0x2000 |
| 150 | |
Russell King - ARM Linux | e8b5e11 | 2011-01-03 22:30:24 +0000 | [diff] [blame] | 151 | /* Maximum times we call dma_pool_alloc on this pool without freeing */ |
Russell King - ARM Linux | 7cb72ad | 2011-01-03 22:35:28 +0000 | [diff] [blame] | 152 | #define MAX_NUM_TSFR_LLIS (PL08X_LLI_TSFR_SIZE/sizeof(struct pl08x_lli)) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 153 | #define PL08X_ALIGN 8 |
| 154 | |
| 155 | static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan) |
| 156 | { |
| 157 | return container_of(chan, struct pl08x_dma_chan, chan); |
| 158 | } |
| 159 | |
Russell King - ARM Linux | 501e67e | 2011-01-03 22:44:57 +0000 | [diff] [blame] | 160 | static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx) |
| 161 | { |
| 162 | return container_of(tx, struct pl08x_txd, tx); |
| 163 | } |
| 164 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 165 | /* |
| 166 | * Physical channel handling |
| 167 | */ |
| 168 | |
| 169 | /* Whether a certain channel is busy or not */ |
| 170 | static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch) |
| 171 | { |
| 172 | unsigned int val; |
| 173 | |
| 174 | val = readl(ch->base + PL080_CH_CONFIG); |
| 175 | return val & PL080_CONFIG_ACTIVE; |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * Set the initial DMA register values i.e. those for the first LLI |
Russell King - ARM Linux | e8b5e11 | 2011-01-03 22:30:24 +0000 | [diff] [blame] | 180 | * The next LLI pointer and the configuration interrupt bit have |
Russell King - ARM Linux | c885bee | 2011-01-03 22:38:52 +0000 | [diff] [blame] | 181 | * been set when the LLIs were constructed. Poke them into the hardware |
| 182 | * and start the transfer. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 183 | */ |
Russell King - ARM Linux | c885bee | 2011-01-03 22:38:52 +0000 | [diff] [blame] | 184 | static void pl08x_start_txd(struct pl08x_dma_chan *plchan, |
| 185 | struct pl08x_txd *txd) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 186 | { |
Russell King - ARM Linux | c885bee | 2011-01-03 22:38:52 +0000 | [diff] [blame] | 187 | struct pl08x_driver_data *pl08x = plchan->host; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 188 | struct pl08x_phy_chan *phychan = plchan->phychan; |
Russell King - ARM Linux | 19524d7 | 2011-01-03 22:39:13 +0000 | [diff] [blame] | 189 | struct pl08x_lli *lli = &txd->llis_va[0]; |
Russell King - ARM Linux | 09b3c32 | 2011-01-03 22:39:53 +0000 | [diff] [blame] | 190 | u32 val; |
Russell King - ARM Linux | c885bee | 2011-01-03 22:38:52 +0000 | [diff] [blame] | 191 | |
| 192 | plchan->at = txd; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 193 | |
Russell King - ARM Linux | c885bee | 2011-01-03 22:38:52 +0000 | [diff] [blame] | 194 | /* Wait for channel inactive */ |
| 195 | while (pl08x_phy_channel_busy(phychan)) |
Russell King - ARM Linux | 19386b3 | 2011-01-03 22:36:29 +0000 | [diff] [blame] | 196 | cpu_relax(); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 197 | |
Russell King - ARM Linux | c885bee | 2011-01-03 22:38:52 +0000 | [diff] [blame] | 198 | dev_vdbg(&pl08x->adev->dev, |
| 199 | "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " |
Russell King - ARM Linux | 19524d7 | 2011-01-03 22:39:13 +0000 | [diff] [blame] | 200 | "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", |
| 201 | phychan->id, lli->src, lli->dst, lli->lli, lli->cctl, |
Russell King - ARM Linux | 09b3c32 | 2011-01-03 22:39:53 +0000 | [diff] [blame] | 202 | txd->ccfg); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 203 | |
Russell King - ARM Linux | 19524d7 | 2011-01-03 22:39:13 +0000 | [diff] [blame] | 204 | writel(lli->src, phychan->base + PL080_CH_SRC_ADDR); |
| 205 | writel(lli->dst, phychan->base + PL080_CH_DST_ADDR); |
| 206 | writel(lli->lli, phychan->base + PL080_CH_LLI); |
| 207 | writel(lli->cctl, phychan->base + PL080_CH_CONTROL); |
Russell King - ARM Linux | 09b3c32 | 2011-01-03 22:39:53 +0000 | [diff] [blame] | 208 | writel(txd->ccfg, phychan->base + PL080_CH_CONFIG); |
Russell King - ARM Linux | c885bee | 2011-01-03 22:38:52 +0000 | [diff] [blame] | 209 | |
| 210 | /* Enable the DMA channel */ |
| 211 | /* Do not access config register until channel shows as disabled */ |
| 212 | while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id)) |
| 213 | cpu_relax(); |
| 214 | |
| 215 | /* Do not access config register until channel shows as inactive */ |
| 216 | val = readl(phychan->base + PL080_CH_CONFIG); |
| 217 | while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE)) |
| 218 | val = readl(phychan->base + PL080_CH_CONFIG); |
| 219 | |
| 220 | writel(val | PL080_CONFIG_ENABLE, phychan->base + PL080_CH_CONFIG); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | /* |
Russell King - ARM Linux | 8179661 | 2011-01-27 12:37:44 +0000 | [diff] [blame] | 224 | * Pause the channel by setting the HALT bit. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 225 | * |
Russell King - ARM Linux | 8179661 | 2011-01-27 12:37:44 +0000 | [diff] [blame] | 226 | * For M->P transfers, pause the DMAC first and then stop the peripheral - |
| 227 | * the FIFO can only drain if the peripheral is still requesting data. |
| 228 | * (note: this can still timeout if the DMAC FIFO never drains of data.) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 229 | * |
Russell King - ARM Linux | 8179661 | 2011-01-27 12:37:44 +0000 | [diff] [blame] | 230 | * For P->M transfers, disable the peripheral first to stop it filling |
| 231 | * the DMAC FIFO, and then pause the DMAC. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 232 | */ |
| 233 | static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch) |
| 234 | { |
| 235 | u32 val; |
Russell King - ARM Linux | 8179661 | 2011-01-27 12:37:44 +0000 | [diff] [blame] | 236 | int timeout; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 237 | |
| 238 | /* Set the HALT bit and wait for the FIFO to drain */ |
| 239 | val = readl(ch->base + PL080_CH_CONFIG); |
| 240 | val |= PL080_CONFIG_HALT; |
| 241 | writel(val, ch->base + PL080_CH_CONFIG); |
| 242 | |
| 243 | /* Wait for channel inactive */ |
Russell King - ARM Linux | 8179661 | 2011-01-27 12:37:44 +0000 | [diff] [blame] | 244 | for (timeout = 1000; timeout; timeout--) { |
| 245 | if (!pl08x_phy_channel_busy(ch)) |
| 246 | break; |
| 247 | udelay(1); |
| 248 | } |
| 249 | if (pl08x_phy_channel_busy(ch)) |
| 250 | pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch) |
| 254 | { |
| 255 | u32 val; |
| 256 | |
| 257 | /* Clear the HALT bit */ |
| 258 | val = readl(ch->base + PL080_CH_CONFIG); |
| 259 | val &= ~PL080_CONFIG_HALT; |
| 260 | writel(val, ch->base + PL080_CH_CONFIG); |
| 261 | } |
| 262 | |
Russell King - ARM Linux | fb52621 | 2011-01-27 12:32:53 +0000 | [diff] [blame] | 263 | /* |
| 264 | * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and |
| 265 | * clears any pending interrupt status. This should not be used for |
| 266 | * an on-going transfer, but as a method of shutting down a channel |
| 267 | * (eg, when it's no longer used) or terminating a transfer. |
| 268 | */ |
| 269 | static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x, |
| 270 | struct pl08x_phy_chan *ch) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 271 | { |
Russell King - ARM Linux | fb52621 | 2011-01-27 12:32:53 +0000 | [diff] [blame] | 272 | u32 val = readl(ch->base + PL080_CH_CONFIG); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 273 | |
Russell King - ARM Linux | fb52621 | 2011-01-27 12:32:53 +0000 | [diff] [blame] | 274 | val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK | |
| 275 | PL080_CONFIG_TC_IRQ_MASK); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 276 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 277 | writel(val, ch->base + PL080_CH_CONFIG); |
Russell King - ARM Linux | fb52621 | 2011-01-27 12:32:53 +0000 | [diff] [blame] | 278 | |
| 279 | writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR); |
| 280 | writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | static inline u32 get_bytes_in_cctl(u32 cctl) |
| 284 | { |
| 285 | /* The source width defines the number of bytes */ |
| 286 | u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK; |
| 287 | |
| 288 | switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { |
| 289 | case PL080_WIDTH_8BIT: |
| 290 | break; |
| 291 | case PL080_WIDTH_16BIT: |
| 292 | bytes *= 2; |
| 293 | break; |
| 294 | case PL080_WIDTH_32BIT: |
| 295 | bytes *= 4; |
| 296 | break; |
| 297 | } |
| 298 | return bytes; |
| 299 | } |
| 300 | |
| 301 | /* The channel should be paused when calling this */ |
| 302 | static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) |
| 303 | { |
| 304 | struct pl08x_phy_chan *ch; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 305 | struct pl08x_txd *txd; |
| 306 | unsigned long flags; |
Russell King - ARM Linux | cace658 | 2011-01-03 22:37:31 +0000 | [diff] [blame] | 307 | size_t bytes = 0; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 308 | |
| 309 | spin_lock_irqsave(&plchan->lock, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 310 | ch = plchan->phychan; |
| 311 | txd = plchan->at; |
| 312 | |
| 313 | /* |
Russell King - ARM Linux | db9f136 | 2011-01-03 22:38:32 +0000 | [diff] [blame] | 314 | * Follow the LLIs to get the number of remaining |
| 315 | * bytes in the currently active transaction. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 316 | */ |
| 317 | if (ch && txd) { |
Russell King - ARM Linux | 4c0df6a | 2011-01-03 22:36:50 +0000 | [diff] [blame] | 318 | u32 clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 319 | |
Russell King - ARM Linux | db9f136 | 2011-01-03 22:38:32 +0000 | [diff] [blame] | 320 | /* First get the remaining bytes in the active transfer */ |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 321 | bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL)); |
| 322 | |
| 323 | if (clli) { |
Russell King - ARM Linux | db9f136 | 2011-01-03 22:38:32 +0000 | [diff] [blame] | 324 | struct pl08x_lli *llis_va = txd->llis_va; |
| 325 | dma_addr_t llis_bus = txd->llis_bus; |
| 326 | int index; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 327 | |
Russell King - ARM Linux | db9f136 | 2011-01-03 22:38:32 +0000 | [diff] [blame] | 328 | BUG_ON(clli < llis_bus || clli >= llis_bus + |
| 329 | sizeof(struct pl08x_lli) * MAX_NUM_TSFR_LLIS); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 330 | |
Russell King - ARM Linux | db9f136 | 2011-01-03 22:38:32 +0000 | [diff] [blame] | 331 | /* |
| 332 | * Locate the next LLI - as this is an array, |
| 333 | * it's simple maths to find. |
| 334 | */ |
| 335 | index = (clli - llis_bus) / sizeof(struct pl08x_lli); |
| 336 | |
| 337 | for (; index < MAX_NUM_TSFR_LLIS; index++) { |
| 338 | bytes += get_bytes_in_cctl(llis_va[index].cctl); |
| 339 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 340 | /* |
Russell King - ARM Linux | e8b5e11 | 2011-01-03 22:30:24 +0000 | [diff] [blame] | 341 | * A LLI pointer of 0 terminates the LLI list |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 342 | */ |
Russell King - ARM Linux | db9f136 | 2011-01-03 22:38:32 +0000 | [diff] [blame] | 343 | if (!llis_va[index].lli) |
| 344 | break; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 345 | } |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | /* Sum up all queued transactions */ |
Russell King - ARM Linux | 15c1723 | 2011-01-03 22:44:36 +0000 | [diff] [blame] | 350 | if (!list_empty(&plchan->pend_list)) { |
Russell King - ARM Linux | db9f136 | 2011-01-03 22:38:32 +0000 | [diff] [blame] | 351 | struct pl08x_txd *txdi; |
Russell King - ARM Linux | 15c1723 | 2011-01-03 22:44:36 +0000 | [diff] [blame] | 352 | list_for_each_entry(txdi, &plchan->pend_list, node) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 353 | bytes += txdi->len; |
| 354 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 355 | } |
| 356 | |
| 357 | spin_unlock_irqrestore(&plchan->lock, flags); |
| 358 | |
| 359 | return bytes; |
| 360 | } |
| 361 | |
| 362 | /* |
| 363 | * Allocate a physical channel for a virtual channel |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 364 | * |
| 365 | * Try to locate a physical channel to be used for this transfer. If all |
| 366 | * are taken return NULL and the requester will have to cope by using |
| 367 | * some fallback PIO mode or retrying later. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 368 | */ |
| 369 | static struct pl08x_phy_chan * |
| 370 | pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, |
| 371 | struct pl08x_dma_chan *virt_chan) |
| 372 | { |
| 373 | struct pl08x_phy_chan *ch = NULL; |
| 374 | unsigned long flags; |
| 375 | int i; |
| 376 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 377 | for (i = 0; i < pl08x->vd->channels; i++) { |
| 378 | ch = &pl08x->phy_chans[i]; |
| 379 | |
| 380 | spin_lock_irqsave(&ch->lock, flags); |
| 381 | |
| 382 | if (!ch->serving) { |
| 383 | ch->serving = virt_chan; |
| 384 | ch->signal = -1; |
| 385 | spin_unlock_irqrestore(&ch->lock, flags); |
| 386 | break; |
| 387 | } |
| 388 | |
| 389 | spin_unlock_irqrestore(&ch->lock, flags); |
| 390 | } |
| 391 | |
| 392 | if (i == pl08x->vd->channels) { |
| 393 | /* No physical channel available, cope with it */ |
| 394 | return NULL; |
| 395 | } |
| 396 | |
Viresh Kumar | b7b6018 | 2011-08-05 15:32:33 +0530 | [diff] [blame] | 397 | pm_runtime_get_sync(&pl08x->adev->dev); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 398 | return ch; |
| 399 | } |
| 400 | |
| 401 | static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x, |
| 402 | struct pl08x_phy_chan *ch) |
| 403 | { |
| 404 | unsigned long flags; |
| 405 | |
Russell King - ARM Linux | fb52621 | 2011-01-27 12:32:53 +0000 | [diff] [blame] | 406 | spin_lock_irqsave(&ch->lock, flags); |
| 407 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 408 | /* Stop the channel and clear its interrupts */ |
Russell King - ARM Linux | fb52621 | 2011-01-27 12:32:53 +0000 | [diff] [blame] | 409 | pl08x_terminate_phy_chan(pl08x, ch); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 410 | |
Viresh Kumar | b7b6018 | 2011-08-05 15:32:33 +0530 | [diff] [blame] | 411 | pm_runtime_put(&pl08x->adev->dev); |
| 412 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 413 | /* Mark it as free */ |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 414 | ch->serving = NULL; |
| 415 | spin_unlock_irqrestore(&ch->lock, flags); |
| 416 | } |
| 417 | |
| 418 | /* |
| 419 | * LLI handling |
| 420 | */ |
| 421 | |
| 422 | static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded) |
| 423 | { |
| 424 | switch (coded) { |
| 425 | case PL080_WIDTH_8BIT: |
| 426 | return 1; |
| 427 | case PL080_WIDTH_16BIT: |
| 428 | return 2; |
| 429 | case PL080_WIDTH_32BIT: |
| 430 | return 4; |
| 431 | default: |
| 432 | break; |
| 433 | } |
| 434 | BUG(); |
| 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth, |
Russell King - ARM Linux | cace658 | 2011-01-03 22:37:31 +0000 | [diff] [blame] | 439 | size_t tsize) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 440 | { |
| 441 | u32 retbits = cctl; |
| 442 | |
Russell King - ARM Linux | e8b5e11 | 2011-01-03 22:30:24 +0000 | [diff] [blame] | 443 | /* Remove all src, dst and transfer size bits */ |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 444 | retbits &= ~PL080_CONTROL_DWIDTH_MASK; |
| 445 | retbits &= ~PL080_CONTROL_SWIDTH_MASK; |
| 446 | retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK; |
| 447 | |
| 448 | /* Then set the bits according to the parameters */ |
| 449 | switch (srcwidth) { |
| 450 | case 1: |
| 451 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT; |
| 452 | break; |
| 453 | case 2: |
| 454 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT; |
| 455 | break; |
| 456 | case 4: |
| 457 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT; |
| 458 | break; |
| 459 | default: |
| 460 | BUG(); |
| 461 | break; |
| 462 | } |
| 463 | |
| 464 | switch (dstwidth) { |
| 465 | case 1: |
| 466 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; |
| 467 | break; |
| 468 | case 2: |
| 469 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; |
| 470 | break; |
| 471 | case 4: |
| 472 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; |
| 473 | break; |
| 474 | default: |
| 475 | BUG(); |
| 476 | break; |
| 477 | } |
| 478 | |
| 479 | retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT; |
| 480 | return retbits; |
| 481 | } |
| 482 | |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 483 | struct pl08x_lli_build_data { |
| 484 | struct pl08x_txd *txd; |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 485 | struct pl08x_bus_data srcbus; |
| 486 | struct pl08x_bus_data dstbus; |
| 487 | size_t remainder; |
Russell King - ARM Linux | 25c94f7 | 2011-07-21 17:11:46 +0100 | [diff] [blame] | 488 | u32 lli_bus; |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 489 | }; |
| 490 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 491 | /* |
Viresh Kumar | 0532e6f | 2011-08-05 15:32:31 +0530 | [diff] [blame] | 492 | * Autoselect a master bus to use for the transfer. Slave will be the chosen as |
| 493 | * victim in case src & dest are not similarly aligned. i.e. If after aligning |
| 494 | * masters address with width requirements of transfer (by sending few byte by |
| 495 | * byte data), slave is still not aligned, then its width will be reduced to |
| 496 | * BYTE. |
| 497 | * - prefers the destination bus if both available |
Viresh Kumar | 036f05f | 2011-08-05 15:32:41 +0530 | [diff] [blame] | 498 | * - prefers bus with fixed address (i.e. peripheral) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 499 | */ |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 500 | static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd, |
| 501 | struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 502 | { |
| 503 | if (!(cctl & PL080_CONTROL_DST_INCR)) { |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 504 | *mbus = &bd->dstbus; |
| 505 | *sbus = &bd->srcbus; |
Viresh Kumar | 036f05f | 2011-08-05 15:32:41 +0530 | [diff] [blame] | 506 | } else if (!(cctl & PL080_CONTROL_SRC_INCR)) { |
| 507 | *mbus = &bd->srcbus; |
| 508 | *sbus = &bd->dstbus; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 509 | } else { |
Viresh Kumar | 036f05f | 2011-08-05 15:32:41 +0530 | [diff] [blame] | 510 | if (bd->dstbus.buswidth >= bd->srcbus.buswidth) { |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 511 | *mbus = &bd->dstbus; |
| 512 | *sbus = &bd->srcbus; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 513 | } else { |
Viresh Kumar | 036f05f | 2011-08-05 15:32:41 +0530 | [diff] [blame] | 514 | *mbus = &bd->srcbus; |
| 515 | *sbus = &bd->dstbus; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 516 | } |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | /* |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 521 | * Fills in one LLI for a certain transfer descriptor and advance the counter |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 522 | */ |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 523 | static void pl08x_fill_lli_for_desc(struct pl08x_lli_build_data *bd, |
| 524 | int num_llis, int len, u32 cctl) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 525 | { |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 526 | struct pl08x_lli *llis_va = bd->txd->llis_va; |
| 527 | dma_addr_t llis_bus = bd->txd->llis_bus; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 528 | |
| 529 | BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS); |
| 530 | |
Russell King - ARM Linux | 30749cb | 2011-01-03 22:41:13 +0000 | [diff] [blame] | 531 | llis_va[num_llis].cctl = cctl; |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 532 | llis_va[num_llis].src = bd->srcbus.addr; |
| 533 | llis_va[num_llis].dst = bd->dstbus.addr; |
Viresh Kumar | 3e27ee8 | 2011-08-05 15:32:27 +0530 | [diff] [blame] | 534 | llis_va[num_llis].lli = llis_bus + (num_llis + 1) * |
| 535 | sizeof(struct pl08x_lli); |
Russell King - ARM Linux | 25c94f7 | 2011-07-21 17:11:46 +0100 | [diff] [blame] | 536 | llis_va[num_llis].lli |= bd->lli_bus; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 537 | |
| 538 | if (cctl & PL080_CONTROL_SRC_INCR) |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 539 | bd->srcbus.addr += len; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 540 | if (cctl & PL080_CONTROL_DST_INCR) |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 541 | bd->dstbus.addr += len; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 542 | |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 543 | BUG_ON(bd->remainder < len); |
Russell King - ARM Linux | cace658 | 2011-01-03 22:37:31 +0000 | [diff] [blame] | 544 | |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 545 | bd->remainder -= len; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 546 | } |
| 547 | |
Viresh Kumar | 03af500 | 2011-08-05 15:32:39 +0530 | [diff] [blame] | 548 | static inline void prep_byte_width_lli(struct pl08x_lli_build_data *bd, |
| 549 | u32 *cctl, u32 len, int num_llis, size_t *total_bytes) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 550 | { |
Viresh Kumar | 03af500 | 2011-08-05 15:32:39 +0530 | [diff] [blame] | 551 | *cctl = pl08x_cctl_bits(*cctl, 1, 1, len); |
| 552 | pl08x_fill_lli_for_desc(bd, num_llis, len, *cctl); |
| 553 | (*total_bytes) += len; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 554 | } |
| 555 | |
| 556 | /* |
| 557 | * This fills in the table of LLIs for the transfer descriptor |
| 558 | * Note that we assume we never have to change the burst sizes |
| 559 | * Return 0 for error |
| 560 | */ |
| 561 | static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, |
| 562 | struct pl08x_txd *txd) |
| 563 | { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 564 | struct pl08x_bus_data *mbus, *sbus; |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 565 | struct pl08x_lli_build_data bd; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 566 | int num_llis = 0; |
Viresh Kumar | 03af500 | 2011-08-05 15:32:39 +0530 | [diff] [blame] | 567 | u32 cctl, early_bytes = 0; |
Viresh Kumar | 3e27ee8 | 2011-08-05 15:32:27 +0530 | [diff] [blame] | 568 | size_t max_bytes_per_lli, total_bytes = 0; |
Russell King - ARM Linux | 7cb72ad | 2011-01-03 22:35:28 +0000 | [diff] [blame] | 569 | struct pl08x_lli *llis_va; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 570 | |
Viresh Kumar | 3e27ee8 | 2011-08-05 15:32:27 +0530 | [diff] [blame] | 571 | txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 572 | if (!txd->llis_va) { |
| 573 | dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__); |
| 574 | return 0; |
| 575 | } |
| 576 | |
| 577 | pl08x->pool_ctr++; |
| 578 | |
Russell King - ARM Linux | 70b5ed6 | 2011-01-03 22:40:13 +0000 | [diff] [blame] | 579 | /* Get the default CCTL */ |
| 580 | cctl = txd->cctl; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 581 | |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 582 | bd.txd = txd; |
Russell King - ARM Linux | d7244e9 | 2011-01-03 22:43:35 +0000 | [diff] [blame] | 583 | bd.srcbus.addr = txd->src_addr; |
| 584 | bd.dstbus.addr = txd->dst_addr; |
Russell King - ARM Linux | 25c94f7 | 2011-07-21 17:11:46 +0100 | [diff] [blame] | 585 | bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0; |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 586 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 587 | /* Find maximum width of the source bus */ |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 588 | bd.srcbus.maxwidth = |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 589 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >> |
| 590 | PL080_CONTROL_SWIDTH_SHIFT); |
| 591 | |
| 592 | /* Find maximum width of the destination bus */ |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 593 | bd.dstbus.maxwidth = |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 594 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >> |
| 595 | PL080_CONTROL_DWIDTH_SHIFT); |
| 596 | |
| 597 | /* Set up the bus widths to the maximum */ |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 598 | bd.srcbus.buswidth = bd.srcbus.maxwidth; |
| 599 | bd.dstbus.buswidth = bd.dstbus.maxwidth; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 600 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 601 | /* We need to count this down to zero */ |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 602 | bd.remainder = txd->len; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 603 | |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 604 | pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 605 | |
Viresh Kumar | fa6a940 | 2011-08-05 15:32:38 +0530 | [diff] [blame] | 606 | dev_vdbg(&pl08x->adev->dev, "src=0x%08x%s/%u dst=0x%08x%s/%u len=%zu\n", |
Russell King - ARM Linux | fc74eb7 | 2011-07-21 17:12:06 +0100 | [diff] [blame] | 607 | bd.srcbus.addr, cctl & PL080_CONTROL_SRC_INCR ? "+" : "", |
| 608 | bd.srcbus.buswidth, |
| 609 | bd.dstbus.addr, cctl & PL080_CONTROL_DST_INCR ? "+" : "", |
| 610 | bd.dstbus.buswidth, |
Viresh Kumar | fa6a940 | 2011-08-05 15:32:38 +0530 | [diff] [blame] | 611 | bd.remainder); |
Russell King - ARM Linux | fc74eb7 | 2011-07-21 17:12:06 +0100 | [diff] [blame] | 612 | dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n", |
| 613 | mbus == &bd.srcbus ? "src" : "dst", |
| 614 | sbus == &bd.srcbus ? "src" : "dst"); |
| 615 | |
Viresh Kumar | 03af500 | 2011-08-05 15:32:39 +0530 | [diff] [blame] | 616 | /* |
Viresh Kumar | 0a23565 | 2011-08-05 15:32:42 +0530 | [diff] [blame] | 617 | * Zero length is only allowed if all these requirements are met: |
| 618 | * - flow controller is peripheral. |
| 619 | * - src.addr is aligned to src.width |
| 620 | * - dst.addr is aligned to dst.width |
| 621 | * |
| 622 | * sg_len == 1 should be true, as there can be two cases here: |
| 623 | * - Memory addresses are contiguous and are not scattered. Here, Only |
| 624 | * one sg will be passed by user driver, with memory address and zero |
| 625 | * length. We pass this to controller and after the transfer it will |
| 626 | * receive the last burst request from peripheral and so transfer |
| 627 | * finishes. |
| 628 | * |
| 629 | * - Memory addresses are scattered and are not contiguous. Here, |
| 630 | * Obviously as DMA controller doesn't know when a lli's transfer gets |
| 631 | * over, it can't load next lli. So in this case, there has to be an |
| 632 | * assumption that only one lli is supported. Thus, we can't have |
| 633 | * scattered addresses. |
| 634 | */ |
| 635 | if (!bd.remainder) { |
| 636 | u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >> |
| 637 | PL080_CONFIG_FLOW_CONTROL_SHIFT; |
| 638 | if (!((fc >= PL080_FLOW_SRC2DST_DST) && |
| 639 | (fc <= PL080_FLOW_SRC2DST_SRC))) { |
| 640 | dev_err(&pl08x->adev->dev, "%s sg len can't be zero", |
| 641 | __func__); |
| 642 | return 0; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 643 | } |
| 644 | |
Viresh Kumar | 0a23565 | 2011-08-05 15:32:42 +0530 | [diff] [blame] | 645 | if ((bd.srcbus.addr % bd.srcbus.buswidth) || |
| 646 | (bd.srcbus.addr % bd.srcbus.buswidth)) { |
| 647 | dev_err(&pl08x->adev->dev, |
| 648 | "%s src & dst address must be aligned to src" |
| 649 | " & dst width if peripheral is flow controller", |
| 650 | __func__); |
| 651 | return 0; |
| 652 | } |
| 653 | |
| 654 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, |
| 655 | bd.dstbus.buswidth, 0); |
| 656 | pl08x_fill_lli_for_desc(&bd, num_llis++, 0, cctl); |
| 657 | } |
| 658 | |
| 659 | /* |
Viresh Kumar | 03af500 | 2011-08-05 15:32:39 +0530 | [diff] [blame] | 660 | * Send byte by byte for following cases |
| 661 | * - Less than a bus width available |
| 662 | * - until master bus is aligned |
| 663 | */ |
| 664 | if (bd.remainder < mbus->buswidth) |
| 665 | early_bytes = bd.remainder; |
| 666 | else if ((mbus->addr) % (mbus->buswidth)) { |
| 667 | early_bytes = mbus->buswidth - (mbus->addr) % (mbus->buswidth); |
| 668 | if ((bd.remainder - early_bytes) < mbus->buswidth) |
| 669 | early_bytes = bd.remainder; |
| 670 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 671 | |
Viresh Kumar | 03af500 | 2011-08-05 15:32:39 +0530 | [diff] [blame] | 672 | if (early_bytes) { |
| 673 | dev_vdbg(&pl08x->adev->dev, "%s byte width LLIs " |
| 674 | "(remain 0x%08x)\n", __func__, bd.remainder); |
| 675 | prep_byte_width_lli(&bd, &cctl, early_bytes, num_llis++, |
| 676 | &total_bytes); |
| 677 | } |
| 678 | |
| 679 | if (bd.remainder) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 680 | /* |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 681 | * Master now aligned |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 682 | * - if slave is not then we must set its width down |
| 683 | */ |
| 684 | if (sbus->addr % sbus->buswidth) { |
| 685 | dev_dbg(&pl08x->adev->dev, |
| 686 | "%s set down bus width to one byte\n", |
| 687 | __func__); |
| 688 | |
| 689 | sbus->buswidth = 1; |
| 690 | } |
| 691 | |
Viresh Kumar | fa6a940 | 2011-08-05 15:32:38 +0530 | [diff] [blame] | 692 | /* Bytes transferred = tsize * src width, not MIN(buswidths) */ |
| 693 | max_bytes_per_lli = bd.srcbus.buswidth * |
| 694 | PL080_CONTROL_TRANSFER_SIZE_MASK; |
| 695 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 696 | /* |
| 697 | * Make largest possible LLIs until less than one bus |
| 698 | * width left |
| 699 | */ |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 700 | while (bd.remainder > (mbus->buswidth - 1)) { |
Viresh Kumar | e071916 | 2011-08-05 15:32:40 +0530 | [diff] [blame] | 701 | size_t lli_len, tsize, width; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 702 | |
| 703 | /* |
| 704 | * If enough left try to send max possible, |
| 705 | * otherwise try to send the remainder |
| 706 | */ |
Viresh Kumar | 16a2e7d | 2011-08-05 15:32:37 +0530 | [diff] [blame] | 707 | lli_len = min(bd.remainder, max_bytes_per_lli); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 708 | |
| 709 | /* |
Viresh Kumar | e071916 | 2011-08-05 15:32:40 +0530 | [diff] [blame] | 710 | * Check against maximum bus alignment: Calculate actual |
Viresh Kumar | 16a2e7d | 2011-08-05 15:32:37 +0530 | [diff] [blame] | 711 | * transfer size in relation to bus width and get a |
Viresh Kumar | e071916 | 2011-08-05 15:32:40 +0530 | [diff] [blame] | 712 | * maximum remainder of the highest bus width - 1 |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 713 | */ |
Viresh Kumar | e071916 | 2011-08-05 15:32:40 +0530 | [diff] [blame] | 714 | width = max(mbus->buswidth, sbus->buswidth); |
| 715 | lli_len = (lli_len / width) * width; |
| 716 | tsize = lli_len / bd.srcbus.buswidth; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 717 | |
Viresh Kumar | 16a2e7d | 2011-08-05 15:32:37 +0530 | [diff] [blame] | 718 | dev_vdbg(&pl08x->adev->dev, |
| 719 | "%s fill lli with single lli chunk of " |
| 720 | "size 0x%08zx (remainder 0x%08zx)\n", |
| 721 | __func__, lli_len, bd.remainder); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 722 | |
Viresh Kumar | 16a2e7d | 2011-08-05 15:32:37 +0530 | [diff] [blame] | 723 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, |
| 724 | bd.dstbus.buswidth, tsize); |
| 725 | pl08x_fill_lli_for_desc(&bd, num_llis++, lli_len, cctl); |
| 726 | total_bytes += lli_len; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 727 | } |
| 728 | |
| 729 | /* |
| 730 | * Send any odd bytes |
| 731 | */ |
Viresh Kumar | 03af500 | 2011-08-05 15:32:39 +0530 | [diff] [blame] | 732 | if (bd.remainder) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 733 | dev_vdbg(&pl08x->adev->dev, |
Viresh Kumar | 03af500 | 2011-08-05 15:32:39 +0530 | [diff] [blame] | 734 | "%s align with boundary, send odd bytes (remain %zu)\n", |
Russell King - ARM Linux | 542361f | 2011-01-03 22:43:15 +0000 | [diff] [blame] | 735 | __func__, bd.remainder); |
Viresh Kumar | 03af500 | 2011-08-05 15:32:39 +0530 | [diff] [blame] | 736 | prep_byte_width_lli(&bd, &cctl, bd.remainder, |
| 737 | num_llis++, &total_bytes); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 738 | } |
| 739 | } |
Viresh Kumar | 16a2e7d | 2011-08-05 15:32:37 +0530 | [diff] [blame] | 740 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 741 | if (total_bytes != txd->len) { |
| 742 | dev_err(&pl08x->adev->dev, |
Russell King - ARM Linux | cace658 | 2011-01-03 22:37:31 +0000 | [diff] [blame] | 743 | "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n", |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 744 | __func__, total_bytes, txd->len); |
| 745 | return 0; |
| 746 | } |
| 747 | |
| 748 | if (num_llis >= MAX_NUM_TSFR_LLIS) { |
| 749 | dev_err(&pl08x->adev->dev, |
| 750 | "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n", |
| 751 | __func__, (u32) MAX_NUM_TSFR_LLIS); |
| 752 | return 0; |
| 753 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 754 | |
Russell King - ARM Linux | b58b6b5 | 2011-01-03 22:34:48 +0000 | [diff] [blame] | 755 | llis_va = txd->llis_va; |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 756 | /* The final LLI terminates the LLI. */ |
Russell King - ARM Linux | bfddfb4 | 2011-01-03 22:38:12 +0000 | [diff] [blame] | 757 | llis_va[num_llis - 1].lli = 0; |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 758 | /* The final LLI element shall also fire an interrupt. */ |
Russell King - ARM Linux | b58b6b5 | 2011-01-03 22:34:48 +0000 | [diff] [blame] | 759 | llis_va[num_llis - 1].cctl |= PL080_CONTROL_TC_IRQ_EN; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 760 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 761 | #ifdef VERBOSE_DEBUG |
| 762 | { |
| 763 | int i; |
| 764 | |
Russell King - ARM Linux | fc74eb7 | 2011-07-21 17:12:06 +0100 | [diff] [blame] | 765 | dev_vdbg(&pl08x->adev->dev, |
| 766 | "%-3s %-9s %-10s %-10s %-10s %s\n", |
| 767 | "lli", "", "csrc", "cdst", "clli", "cctl"); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 768 | for (i = 0; i < num_llis; i++) { |
| 769 | dev_vdbg(&pl08x->adev->dev, |
Russell King - ARM Linux | fc74eb7 | 2011-07-21 17:12:06 +0100 | [diff] [blame] | 770 | "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n", |
| 771 | i, &llis_va[i], llis_va[i].src, |
| 772 | llis_va[i].dst, llis_va[i].lli, llis_va[i].cctl |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 773 | ); |
| 774 | } |
| 775 | } |
| 776 | #endif |
| 777 | |
| 778 | return num_llis; |
| 779 | } |
| 780 | |
| 781 | /* You should call this with the struct pl08x lock held */ |
| 782 | static void pl08x_free_txd(struct pl08x_driver_data *pl08x, |
| 783 | struct pl08x_txd *txd) |
| 784 | { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 785 | /* Free the LLI */ |
Russell King - ARM Linux | 56b6188 | 2011-01-03 22:37:10 +0000 | [diff] [blame] | 786 | dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 787 | |
| 788 | pl08x->pool_ctr--; |
| 789 | |
| 790 | kfree(txd); |
| 791 | } |
| 792 | |
| 793 | static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, |
| 794 | struct pl08x_dma_chan *plchan) |
| 795 | { |
| 796 | struct pl08x_txd *txdi = NULL; |
| 797 | struct pl08x_txd *next; |
| 798 | |
Russell King - ARM Linux | 15c1723 | 2011-01-03 22:44:36 +0000 | [diff] [blame] | 799 | if (!list_empty(&plchan->pend_list)) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 800 | list_for_each_entry_safe(txdi, |
Russell King - ARM Linux | 15c1723 | 2011-01-03 22:44:36 +0000 | [diff] [blame] | 801 | next, &plchan->pend_list, node) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 802 | list_del(&txdi->node); |
| 803 | pl08x_free_txd(pl08x, txdi); |
| 804 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 805 | } |
| 806 | } |
| 807 | |
| 808 | /* |
| 809 | * The DMA ENGINE API |
| 810 | */ |
| 811 | static int pl08x_alloc_chan_resources(struct dma_chan *chan) |
| 812 | { |
| 813 | return 0; |
| 814 | } |
| 815 | |
| 816 | static void pl08x_free_chan_resources(struct dma_chan *chan) |
| 817 | { |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * This should be called with the channel plchan->lock held |
| 822 | */ |
| 823 | static int prep_phy_channel(struct pl08x_dma_chan *plchan, |
| 824 | struct pl08x_txd *txd) |
| 825 | { |
| 826 | struct pl08x_driver_data *pl08x = plchan->host; |
| 827 | struct pl08x_phy_chan *ch; |
| 828 | int ret; |
| 829 | |
| 830 | /* Check if we already have a channel */ |
| 831 | if (plchan->phychan) |
| 832 | return 0; |
| 833 | |
| 834 | ch = pl08x_get_phy_channel(pl08x, plchan); |
| 835 | if (!ch) { |
| 836 | /* No physical channel available, cope with it */ |
| 837 | dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); |
| 838 | return -EBUSY; |
| 839 | } |
| 840 | |
| 841 | /* |
| 842 | * OK we have a physical channel: for memcpy() this is all we |
| 843 | * need, but for slaves the physical signals may be muxed! |
| 844 | * Can the platform allow us to use this channel? |
| 845 | */ |
Viresh Kumar | 16ca810 | 2011-08-05 15:32:35 +0530 | [diff] [blame] | 846 | if (plchan->slave && pl08x->pd->get_signal) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 847 | ret = pl08x->pd->get_signal(plchan); |
| 848 | if (ret < 0) { |
| 849 | dev_dbg(&pl08x->adev->dev, |
| 850 | "unable to use physical channel %d for transfer on %s due to platform restrictions\n", |
| 851 | ch->id, plchan->name); |
| 852 | /* Release physical channel & return */ |
| 853 | pl08x_put_phy_channel(pl08x, ch); |
| 854 | return -EBUSY; |
| 855 | } |
| 856 | ch->signal = ret; |
Russell King - ARM Linux | 09b3c32 | 2011-01-03 22:39:53 +0000 | [diff] [blame] | 857 | |
| 858 | /* Assign the flow control signal to this channel */ |
| 859 | if (txd->direction == DMA_TO_DEVICE) |
| 860 | txd->ccfg |= ch->signal << PL080_CONFIG_DST_SEL_SHIFT; |
| 861 | else if (txd->direction == DMA_FROM_DEVICE) |
| 862 | txd->ccfg |= ch->signal << PL080_CONFIG_SRC_SEL_SHIFT; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 863 | } |
| 864 | |
| 865 | dev_dbg(&pl08x->adev->dev, "allocated physical channel %d and signal %d for xfer on %s\n", |
| 866 | ch->id, |
| 867 | ch->signal, |
| 868 | plchan->name); |
| 869 | |
Russell King - ARM Linux | 8087aac | 2011-01-03 22:45:17 +0000 | [diff] [blame] | 870 | plchan->phychan_hold++; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 871 | plchan->phychan = ch; |
| 872 | |
| 873 | return 0; |
| 874 | } |
| 875 | |
Russell King - ARM Linux | 8c8cc2b | 2011-01-03 22:36:09 +0000 | [diff] [blame] | 876 | static void release_phy_channel(struct pl08x_dma_chan *plchan) |
| 877 | { |
| 878 | struct pl08x_driver_data *pl08x = plchan->host; |
| 879 | |
| 880 | if ((plchan->phychan->signal >= 0) && pl08x->pd->put_signal) { |
| 881 | pl08x->pd->put_signal(plchan); |
| 882 | plchan->phychan->signal = -1; |
| 883 | } |
| 884 | pl08x_put_phy_channel(pl08x, plchan->phychan); |
| 885 | plchan->phychan = NULL; |
| 886 | } |
| 887 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 888 | static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx) |
| 889 | { |
| 890 | struct pl08x_dma_chan *plchan = to_pl08x_chan(tx->chan); |
Russell King - ARM Linux | 501e67e | 2011-01-03 22:44:57 +0000 | [diff] [blame] | 891 | struct pl08x_txd *txd = to_pl08x_txd(tx); |
Russell King - ARM Linux | c370e59 | 2011-01-03 22:45:37 +0000 | [diff] [blame] | 892 | unsigned long flags; |
| 893 | |
| 894 | spin_lock_irqsave(&plchan->lock, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 895 | |
Russell King - ARM Linux | 91aa5fa | 2011-01-03 22:31:04 +0000 | [diff] [blame] | 896 | plchan->chan.cookie += 1; |
| 897 | if (plchan->chan.cookie < 0) |
| 898 | plchan->chan.cookie = 1; |
| 899 | tx->cookie = plchan->chan.cookie; |
Russell King - ARM Linux | 501e67e | 2011-01-03 22:44:57 +0000 | [diff] [blame] | 900 | |
| 901 | /* Put this onto the pending list */ |
| 902 | list_add_tail(&txd->node, &plchan->pend_list); |
| 903 | |
| 904 | /* |
| 905 | * If there was no physical channel available for this memcpy, |
| 906 | * stack the request up and indicate that the channel is waiting |
| 907 | * for a free physical channel. |
| 908 | */ |
| 909 | if (!plchan->slave && !plchan->phychan) { |
| 910 | /* Do this memcpy whenever there is a channel ready */ |
| 911 | plchan->state = PL08X_CHAN_WAITING; |
| 912 | plchan->waiting = txd; |
Russell King - ARM Linux | 8087aac | 2011-01-03 22:45:17 +0000 | [diff] [blame] | 913 | } else { |
| 914 | plchan->phychan_hold--; |
Russell King - ARM Linux | 501e67e | 2011-01-03 22:44:57 +0000 | [diff] [blame] | 915 | } |
| 916 | |
Russell King - ARM Linux | c370e59 | 2011-01-03 22:45:37 +0000 | [diff] [blame] | 917 | spin_unlock_irqrestore(&plchan->lock, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 918 | |
| 919 | return tx->cookie; |
| 920 | } |
| 921 | |
| 922 | static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt( |
| 923 | struct dma_chan *chan, unsigned long flags) |
| 924 | { |
| 925 | struct dma_async_tx_descriptor *retval = NULL; |
| 926 | |
| 927 | return retval; |
| 928 | } |
| 929 | |
| 930 | /* |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 931 | * Code accessing dma_async_is_complete() in a tight loop may give problems. |
| 932 | * If slaves are relying on interrupts to signal completion this function |
| 933 | * must not be called with interrupts disabled. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 934 | */ |
Viresh Kumar | 3e27ee8 | 2011-08-05 15:32:27 +0530 | [diff] [blame] | 935 | static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan, |
| 936 | dma_cookie_t cookie, struct dma_tx_state *txstate) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 937 | { |
| 938 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); |
| 939 | dma_cookie_t last_used; |
| 940 | dma_cookie_t last_complete; |
| 941 | enum dma_status ret; |
| 942 | u32 bytesleft = 0; |
| 943 | |
Russell King - ARM Linux | 91aa5fa | 2011-01-03 22:31:04 +0000 | [diff] [blame] | 944 | last_used = plchan->chan.cookie; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 945 | last_complete = plchan->lc; |
| 946 | |
| 947 | ret = dma_async_is_complete(cookie, last_complete, last_used); |
| 948 | if (ret == DMA_SUCCESS) { |
| 949 | dma_set_tx_state(txstate, last_complete, last_used, 0); |
| 950 | return ret; |
| 951 | } |
| 952 | |
| 953 | /* |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 954 | * This cookie not complete yet |
| 955 | */ |
Russell King - ARM Linux | 91aa5fa | 2011-01-03 22:31:04 +0000 | [diff] [blame] | 956 | last_used = plchan->chan.cookie; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 957 | last_complete = plchan->lc; |
| 958 | |
| 959 | /* Get number of bytes left in the active transactions and queue */ |
| 960 | bytesleft = pl08x_getbytes_chan(plchan); |
| 961 | |
| 962 | dma_set_tx_state(txstate, last_complete, last_used, |
| 963 | bytesleft); |
| 964 | |
| 965 | if (plchan->state == PL08X_CHAN_PAUSED) |
| 966 | return DMA_PAUSED; |
| 967 | |
| 968 | /* Whether waiting or running, we're in progress */ |
| 969 | return DMA_IN_PROGRESS; |
| 970 | } |
| 971 | |
| 972 | /* PrimeCell DMA extension */ |
| 973 | struct burst_table { |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 974 | u32 burstwords; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 975 | u32 reg; |
| 976 | }; |
| 977 | |
| 978 | static const struct burst_table burst_sizes[] = { |
| 979 | { |
| 980 | .burstwords = 256, |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 981 | .reg = PL080_BSIZE_256, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 982 | }, |
| 983 | { |
| 984 | .burstwords = 128, |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 985 | .reg = PL080_BSIZE_128, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 986 | }, |
| 987 | { |
| 988 | .burstwords = 64, |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 989 | .reg = PL080_BSIZE_64, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 990 | }, |
| 991 | { |
| 992 | .burstwords = 32, |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 993 | .reg = PL080_BSIZE_32, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 994 | }, |
| 995 | { |
| 996 | .burstwords = 16, |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 997 | .reg = PL080_BSIZE_16, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 998 | }, |
| 999 | { |
| 1000 | .burstwords = 8, |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 1001 | .reg = PL080_BSIZE_8, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1002 | }, |
| 1003 | { |
| 1004 | .burstwords = 4, |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 1005 | .reg = PL080_BSIZE_4, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1006 | }, |
| 1007 | { |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 1008 | .burstwords = 0, |
| 1009 | .reg = PL080_BSIZE_1, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1010 | }, |
| 1011 | }; |
| 1012 | |
Russell King - ARM Linux | 121c847 | 2011-07-21 17:13:48 +0100 | [diff] [blame] | 1013 | /* |
| 1014 | * Given the source and destination available bus masks, select which |
| 1015 | * will be routed to each port. We try to have source and destination |
| 1016 | * on separate ports, but always respect the allowable settings. |
| 1017 | */ |
| 1018 | static u32 pl08x_select_bus(u8 src, u8 dst) |
| 1019 | { |
| 1020 | u32 cctl = 0; |
| 1021 | |
| 1022 | if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1))) |
| 1023 | cctl |= PL080_CONTROL_DST_AHB2; |
| 1024 | if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2))) |
| 1025 | cctl |= PL080_CONTROL_SRC_AHB2; |
| 1026 | |
| 1027 | return cctl; |
| 1028 | } |
| 1029 | |
Russell King - ARM Linux | f14c426 | 2011-07-21 17:12:47 +0100 | [diff] [blame] | 1030 | static u32 pl08x_cctl(u32 cctl) |
| 1031 | { |
| 1032 | cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 | |
| 1033 | PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR | |
| 1034 | PL080_CONTROL_PROT_MASK); |
| 1035 | |
| 1036 | /* Access the cell in privileged mode, non-bufferable, non-cacheable */ |
| 1037 | return cctl | PL080_CONTROL_PROT_SYS; |
| 1038 | } |
| 1039 | |
Russell King - ARM Linux | aa88cda | 2011-07-21 17:13:28 +0100 | [diff] [blame] | 1040 | static u32 pl08x_width(enum dma_slave_buswidth width) |
| 1041 | { |
| 1042 | switch (width) { |
| 1043 | case DMA_SLAVE_BUSWIDTH_1_BYTE: |
| 1044 | return PL080_WIDTH_8BIT; |
| 1045 | case DMA_SLAVE_BUSWIDTH_2_BYTES: |
| 1046 | return PL080_WIDTH_16BIT; |
| 1047 | case DMA_SLAVE_BUSWIDTH_4_BYTES: |
| 1048 | return PL080_WIDTH_32BIT; |
Vinod Koul | f32807f | 2011-07-25 19:22:01 +0530 | [diff] [blame] | 1049 | default: |
| 1050 | return ~0; |
Russell King - ARM Linux | aa88cda | 2011-07-21 17:13:28 +0100 | [diff] [blame] | 1051 | } |
Russell King - ARM Linux | aa88cda | 2011-07-21 17:13:28 +0100 | [diff] [blame] | 1052 | } |
| 1053 | |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 1054 | static u32 pl08x_burst(u32 maxburst) |
| 1055 | { |
| 1056 | int i; |
| 1057 | |
| 1058 | for (i = 0; i < ARRAY_SIZE(burst_sizes); i++) |
| 1059 | if (burst_sizes[i].burstwords <= maxburst) |
| 1060 | break; |
| 1061 | |
| 1062 | return burst_sizes[i].reg; |
| 1063 | } |
| 1064 | |
Russell King - ARM Linux | f0fd944 | 2011-01-03 22:45:57 +0000 | [diff] [blame] | 1065 | static int dma_set_runtime_config(struct dma_chan *chan, |
| 1066 | struct dma_slave_config *config) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1067 | { |
| 1068 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); |
| 1069 | struct pl08x_driver_data *pl08x = plchan->host; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1070 | enum dma_slave_buswidth addr_width; |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 1071 | u32 width, burst, maxburst; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1072 | u32 cctl = 0; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1073 | |
Russell King - ARM Linux | b7f7586 | 2011-01-03 22:46:17 +0000 | [diff] [blame] | 1074 | if (!plchan->slave) |
| 1075 | return -EINVAL; |
| 1076 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1077 | /* Transfer direction */ |
| 1078 | plchan->runtime_direction = config->direction; |
| 1079 | if (config->direction == DMA_TO_DEVICE) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1080 | addr_width = config->dst_addr_width; |
| 1081 | maxburst = config->dst_maxburst; |
| 1082 | } else if (config->direction == DMA_FROM_DEVICE) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1083 | addr_width = config->src_addr_width; |
| 1084 | maxburst = config->src_maxburst; |
| 1085 | } else { |
| 1086 | dev_err(&pl08x->adev->dev, |
| 1087 | "bad runtime_config: alien transfer direction\n"); |
Russell King - ARM Linux | f0fd944 | 2011-01-03 22:45:57 +0000 | [diff] [blame] | 1088 | return -EINVAL; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1089 | } |
| 1090 | |
Russell King - ARM Linux | aa88cda | 2011-07-21 17:13:28 +0100 | [diff] [blame] | 1091 | width = pl08x_width(addr_width); |
| 1092 | if (width == ~0) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1093 | dev_err(&pl08x->adev->dev, |
| 1094 | "bad runtime_config: alien address width\n"); |
Russell King - ARM Linux | f0fd944 | 2011-01-03 22:45:57 +0000 | [diff] [blame] | 1095 | return -EINVAL; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1096 | } |
| 1097 | |
Russell King - ARM Linux | aa88cda | 2011-07-21 17:13:28 +0100 | [diff] [blame] | 1098 | cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; |
| 1099 | cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; |
| 1100 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1101 | /* |
Russell King - ARM Linux | 4440aac | 2011-01-03 22:30:44 +0000 | [diff] [blame] | 1102 | * If this channel will only request single transfers, set this |
| 1103 | * down to ONE element. Also select one element if no maxburst |
| 1104 | * is specified. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1105 | */ |
Russell King - ARM Linux | 760596c6 | 2011-07-21 17:14:08 +0100 | [diff] [blame] | 1106 | if (plchan->cd->single) |
| 1107 | maxburst = 1; |
| 1108 | |
| 1109 | burst = pl08x_burst(maxburst); |
| 1110 | cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; |
| 1111 | cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1112 | |
Russell King - ARM Linux | b207b4d | 2011-07-21 17:12:27 +0100 | [diff] [blame] | 1113 | if (plchan->runtime_direction == DMA_FROM_DEVICE) { |
| 1114 | plchan->src_addr = config->src_addr; |
Russell King - ARM Linux | 121c847 | 2011-07-21 17:13:48 +0100 | [diff] [blame] | 1115 | plchan->src_cctl = pl08x_cctl(cctl) | PL080_CONTROL_DST_INCR | |
| 1116 | pl08x_select_bus(plchan->cd->periph_buses, |
| 1117 | pl08x->mem_buses); |
Russell King - ARM Linux | b207b4d | 2011-07-21 17:12:27 +0100 | [diff] [blame] | 1118 | } else { |
| 1119 | plchan->dst_addr = config->dst_addr; |
Russell King - ARM Linux | 121c847 | 2011-07-21 17:13:48 +0100 | [diff] [blame] | 1120 | plchan->dst_cctl = pl08x_cctl(cctl) | PL080_CONTROL_SRC_INCR | |
| 1121 | pl08x_select_bus(pl08x->mem_buses, |
| 1122 | plchan->cd->periph_buses); |
Russell King - ARM Linux | b207b4d | 2011-07-21 17:12:27 +0100 | [diff] [blame] | 1123 | } |
Russell King - ARM Linux | f0fd944 | 2011-01-03 22:45:57 +0000 | [diff] [blame] | 1124 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1125 | dev_dbg(&pl08x->adev->dev, |
| 1126 | "configured channel %s (%s) for %s, data width %d, " |
Russell King - ARM Linux | 4983a04 | 2011-01-03 22:39:33 +0000 | [diff] [blame] | 1127 | "maxburst %d words, LE, CCTL=0x%08x\n", |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1128 | dma_chan_name(chan), plchan->name, |
| 1129 | (config->direction == DMA_FROM_DEVICE) ? "RX" : "TX", |
| 1130 | addr_width, |
| 1131 | maxburst, |
Russell King - ARM Linux | 4983a04 | 2011-01-03 22:39:33 +0000 | [diff] [blame] | 1132 | cctl); |
Russell King - ARM Linux | f0fd944 | 2011-01-03 22:45:57 +0000 | [diff] [blame] | 1133 | |
| 1134 | return 0; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1135 | } |
| 1136 | |
| 1137 | /* |
| 1138 | * Slave transactions callback to the slave device to allow |
| 1139 | * synchronization of slave DMA signals with the DMAC enable |
| 1140 | */ |
| 1141 | static void pl08x_issue_pending(struct dma_chan *chan) |
| 1142 | { |
| 1143 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1144 | unsigned long flags; |
| 1145 | |
| 1146 | spin_lock_irqsave(&plchan->lock, flags); |
Russell King - ARM Linux | 9c0bb43 | 2011-01-03 22:32:05 +0000 | [diff] [blame] | 1147 | /* Something is already active, or we're waiting for a channel... */ |
| 1148 | if (plchan->at || plchan->state == PL08X_CHAN_WAITING) { |
| 1149 | spin_unlock_irqrestore(&plchan->lock, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1150 | return; |
Russell King - ARM Linux | 9c0bb43 | 2011-01-03 22:32:05 +0000 | [diff] [blame] | 1151 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1152 | |
| 1153 | /* Take the first element in the queue and execute it */ |
Russell King - ARM Linux | 15c1723 | 2011-01-03 22:44:36 +0000 | [diff] [blame] | 1154 | if (!list_empty(&plchan->pend_list)) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1155 | struct pl08x_txd *next; |
| 1156 | |
Russell King - ARM Linux | 15c1723 | 2011-01-03 22:44:36 +0000 | [diff] [blame] | 1157 | next = list_first_entry(&plchan->pend_list, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1158 | struct pl08x_txd, |
| 1159 | node); |
| 1160 | list_del(&next->node); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1161 | plchan->state = PL08X_CHAN_RUNNING; |
| 1162 | |
Russell King - ARM Linux | c885bee | 2011-01-03 22:38:52 +0000 | [diff] [blame] | 1163 | pl08x_start_txd(plchan, next); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1164 | } |
| 1165 | |
| 1166 | spin_unlock_irqrestore(&plchan->lock, flags); |
| 1167 | } |
| 1168 | |
| 1169 | static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan, |
| 1170 | struct pl08x_txd *txd) |
| 1171 | { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1172 | struct pl08x_driver_data *pl08x = plchan->host; |
Russell King - ARM Linux | c370e59 | 2011-01-03 22:45:37 +0000 | [diff] [blame] | 1173 | unsigned long flags; |
| 1174 | int num_llis, ret; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1175 | |
| 1176 | num_llis = pl08x_fill_llis_for_desc(pl08x, txd); |
Russell King - ARM Linux | dafa731 | 2011-01-03 22:31:45 +0000 | [diff] [blame] | 1177 | if (!num_llis) { |
Viresh Kumar | 57001a6 | 2011-08-05 15:32:45 +0530 | [diff] [blame] | 1178 | spin_lock_irqsave(&plchan->lock, flags); |
| 1179 | pl08x_free_txd(pl08x, txd); |
| 1180 | spin_unlock_irqrestore(&plchan->lock, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1181 | return -EINVAL; |
Russell King - ARM Linux | dafa731 | 2011-01-03 22:31:45 +0000 | [diff] [blame] | 1182 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1183 | |
Russell King - ARM Linux | c370e59 | 2011-01-03 22:45:37 +0000 | [diff] [blame] | 1184 | spin_lock_irqsave(&plchan->lock, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1185 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1186 | /* |
| 1187 | * See if we already have a physical channel allocated, |
| 1188 | * else this is the time to try to get one. |
| 1189 | */ |
| 1190 | ret = prep_phy_channel(plchan, txd); |
| 1191 | if (ret) { |
| 1192 | /* |
Russell King - ARM Linux | 501e67e | 2011-01-03 22:44:57 +0000 | [diff] [blame] | 1193 | * No physical channel was available. |
| 1194 | * |
| 1195 | * memcpy transfers can be sorted out at submission time. |
| 1196 | * |
| 1197 | * Slave transfers may have been denied due to platform |
| 1198 | * channel muxing restrictions. Since there is no guarantee |
| 1199 | * that this will ever be resolved, and the signal must be |
| 1200 | * acquired AFTER acquiring the physical channel, we will let |
| 1201 | * them be NACK:ed with -EBUSY here. The drivers can retry |
| 1202 | * the prep() call if they are eager on doing this using DMA. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1203 | */ |
| 1204 | if (plchan->slave) { |
| 1205 | pl08x_free_txd_list(pl08x, plchan); |
Russell King - ARM Linux | 501e67e | 2011-01-03 22:44:57 +0000 | [diff] [blame] | 1206 | pl08x_free_txd(pl08x, txd); |
Russell King - ARM Linux | c370e59 | 2011-01-03 22:45:37 +0000 | [diff] [blame] | 1207 | spin_unlock_irqrestore(&plchan->lock, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1208 | return -EBUSY; |
| 1209 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1210 | } else |
| 1211 | /* |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 1212 | * Else we're all set, paused and ready to roll, status |
| 1213 | * will switch to PL08X_CHAN_RUNNING when we call |
| 1214 | * issue_pending(). If there is something running on the |
| 1215 | * channel already we don't change its state. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1216 | */ |
| 1217 | if (plchan->state == PL08X_CHAN_IDLE) |
| 1218 | plchan->state = PL08X_CHAN_PAUSED; |
| 1219 | |
Russell King - ARM Linux | c370e59 | 2011-01-03 22:45:37 +0000 | [diff] [blame] | 1220 | spin_unlock_irqrestore(&plchan->lock, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1221 | |
| 1222 | return 0; |
| 1223 | } |
| 1224 | |
Russell King - ARM Linux | c042879 | 2011-01-03 22:43:56 +0000 | [diff] [blame] | 1225 | static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan, |
| 1226 | unsigned long flags) |
Russell King - ARM Linux | ac3cd20 | 2011-01-03 22:35:49 +0000 | [diff] [blame] | 1227 | { |
Viresh Kumar | b201c11 | 2011-08-05 15:32:29 +0530 | [diff] [blame] | 1228 | struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); |
Russell King - ARM Linux | ac3cd20 | 2011-01-03 22:35:49 +0000 | [diff] [blame] | 1229 | |
| 1230 | if (txd) { |
| 1231 | dma_async_tx_descriptor_init(&txd->tx, &plchan->chan); |
Russell King - ARM Linux | c042879 | 2011-01-03 22:43:56 +0000 | [diff] [blame] | 1232 | txd->tx.flags = flags; |
Russell King - ARM Linux | ac3cd20 | 2011-01-03 22:35:49 +0000 | [diff] [blame] | 1233 | txd->tx.tx_submit = pl08x_tx_submit; |
| 1234 | INIT_LIST_HEAD(&txd->node); |
Russell King - ARM Linux | 4983a04 | 2011-01-03 22:39:33 +0000 | [diff] [blame] | 1235 | |
| 1236 | /* Always enable error and terminal interrupts */ |
| 1237 | txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK | |
| 1238 | PL080_CONFIG_TC_IRQ_MASK; |
Russell King - ARM Linux | ac3cd20 | 2011-01-03 22:35:49 +0000 | [diff] [blame] | 1239 | } |
| 1240 | return txd; |
| 1241 | } |
| 1242 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1243 | /* |
| 1244 | * Initialize a descriptor to be used by memcpy submit |
| 1245 | */ |
| 1246 | static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( |
| 1247 | struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, |
| 1248 | size_t len, unsigned long flags) |
| 1249 | { |
| 1250 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); |
| 1251 | struct pl08x_driver_data *pl08x = plchan->host; |
| 1252 | struct pl08x_txd *txd; |
| 1253 | int ret; |
| 1254 | |
Russell King - ARM Linux | c042879 | 2011-01-03 22:43:56 +0000 | [diff] [blame] | 1255 | txd = pl08x_get_txd(plchan, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1256 | if (!txd) { |
| 1257 | dev_err(&pl08x->adev->dev, |
| 1258 | "%s no memory for descriptor\n", __func__); |
| 1259 | return NULL; |
| 1260 | } |
| 1261 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1262 | txd->direction = DMA_NONE; |
Russell King - ARM Linux | d7244e9 | 2011-01-03 22:43:35 +0000 | [diff] [blame] | 1263 | txd->src_addr = src; |
| 1264 | txd->dst_addr = dest; |
Russell King - ARM Linux | c7da9a5 | 2011-01-03 22:40:53 +0000 | [diff] [blame] | 1265 | txd->len = len; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1266 | |
| 1267 | /* Set platform data for m2m */ |
Russell King - ARM Linux | 4983a04 | 2011-01-03 22:39:33 +0000 | [diff] [blame] | 1268 | txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
Russell King - ARM Linux | c7da9a5 | 2011-01-03 22:40:53 +0000 | [diff] [blame] | 1269 | txd->cctl = pl08x->pd->memcpy_channel.cctl & |
| 1270 | ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2); |
Russell King - ARM Linux | 4983a04 | 2011-01-03 22:39:33 +0000 | [diff] [blame] | 1271 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1272 | /* Both to be incremented or the code will break */ |
Russell King - ARM Linux | 70b5ed6 | 2011-01-03 22:40:13 +0000 | [diff] [blame] | 1273 | txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR; |
Russell King - ARM Linux | c7da9a5 | 2011-01-03 22:40:53 +0000 | [diff] [blame] | 1274 | |
Russell King - ARM Linux | c7da9a5 | 2011-01-03 22:40:53 +0000 | [diff] [blame] | 1275 | if (pl08x->vd->dualmaster) |
Russell King - ARM Linux | 121c847 | 2011-07-21 17:13:48 +0100 | [diff] [blame] | 1276 | txd->cctl |= pl08x_select_bus(pl08x->mem_buses, |
| 1277 | pl08x->mem_buses); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1278 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1279 | ret = pl08x_prep_channel_resources(plchan, txd); |
| 1280 | if (ret) |
| 1281 | return NULL; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1282 | |
| 1283 | return &txd->tx; |
| 1284 | } |
| 1285 | |
Russell King - ARM Linux | 3e2a037 | 2011-01-03 22:32:46 +0000 | [diff] [blame] | 1286 | static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1287 | struct dma_chan *chan, struct scatterlist *sgl, |
| 1288 | unsigned int sg_len, enum dma_data_direction direction, |
| 1289 | unsigned long flags) |
| 1290 | { |
| 1291 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); |
| 1292 | struct pl08x_driver_data *pl08x = plchan->host; |
| 1293 | struct pl08x_txd *txd; |
Viresh Kumar | 0a23565 | 2011-08-05 15:32:42 +0530 | [diff] [blame] | 1294 | int ret, tmp; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1295 | |
| 1296 | /* |
| 1297 | * Current implementation ASSUMES only one sg |
| 1298 | */ |
| 1299 | if (sg_len != 1) { |
| 1300 | dev_err(&pl08x->adev->dev, "%s prepared too long sglist\n", |
| 1301 | __func__); |
| 1302 | BUG(); |
| 1303 | } |
| 1304 | |
| 1305 | dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", |
| 1306 | __func__, sgl->length, plchan->name); |
| 1307 | |
Russell King - ARM Linux | c042879 | 2011-01-03 22:43:56 +0000 | [diff] [blame] | 1308 | txd = pl08x_get_txd(plchan, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1309 | if (!txd) { |
| 1310 | dev_err(&pl08x->adev->dev, "%s no txd\n", __func__); |
| 1311 | return NULL; |
| 1312 | } |
| 1313 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1314 | if (direction != plchan->runtime_direction) |
| 1315 | dev_err(&pl08x->adev->dev, "%s DMA setup does not match " |
| 1316 | "the direction configured for the PrimeCell\n", |
| 1317 | __func__); |
| 1318 | |
| 1319 | /* |
| 1320 | * Set up addresses, the PrimeCell configured address |
| 1321 | * will take precedence since this may configure the |
| 1322 | * channel target address dynamically at runtime. |
| 1323 | */ |
| 1324 | txd->direction = direction; |
Russell King - ARM Linux | c7da9a5 | 2011-01-03 22:40:53 +0000 | [diff] [blame] | 1325 | txd->len = sgl->length; |
| 1326 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1327 | if (direction == DMA_TO_DEVICE) { |
Russell King - ARM Linux | 121c847 | 2011-07-21 17:13:48 +0100 | [diff] [blame] | 1328 | txd->cctl = plchan->dst_cctl; |
Russell King - ARM Linux | d7244e9 | 2011-01-03 22:43:35 +0000 | [diff] [blame] | 1329 | txd->src_addr = sgl->dma_address; |
Russell King - ARM Linux | b207b4d | 2011-07-21 17:12:27 +0100 | [diff] [blame] | 1330 | txd->dst_addr = plchan->dst_addr; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1331 | } else if (direction == DMA_FROM_DEVICE) { |
Russell King - ARM Linux | 121c847 | 2011-07-21 17:13:48 +0100 | [diff] [blame] | 1332 | txd->cctl = plchan->src_cctl; |
Russell King - ARM Linux | b207b4d | 2011-07-21 17:12:27 +0100 | [diff] [blame] | 1333 | txd->src_addr = plchan->src_addr; |
Russell King - ARM Linux | d7244e9 | 2011-01-03 22:43:35 +0000 | [diff] [blame] | 1334 | txd->dst_addr = sgl->dma_address; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1335 | } else { |
| 1336 | dev_err(&pl08x->adev->dev, |
| 1337 | "%s direction unsupported\n", __func__); |
| 1338 | return NULL; |
| 1339 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1340 | |
Viresh Kumar | 0a23565 | 2011-08-05 15:32:42 +0530 | [diff] [blame] | 1341 | if (plchan->cd->device_fc) |
| 1342 | tmp = (direction == DMA_TO_DEVICE) ? PL080_FLOW_MEM2PER_PER : |
| 1343 | PL080_FLOW_PER2MEM_PER; |
| 1344 | else |
| 1345 | tmp = (direction == DMA_TO_DEVICE) ? PL080_FLOW_MEM2PER : |
| 1346 | PL080_FLOW_PER2MEM; |
| 1347 | |
| 1348 | txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
| 1349 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1350 | ret = pl08x_prep_channel_resources(plchan, txd); |
| 1351 | if (ret) |
| 1352 | return NULL; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1353 | |
| 1354 | return &txd->tx; |
| 1355 | } |
| 1356 | |
| 1357 | static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, |
| 1358 | unsigned long arg) |
| 1359 | { |
| 1360 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); |
| 1361 | struct pl08x_driver_data *pl08x = plchan->host; |
| 1362 | unsigned long flags; |
| 1363 | int ret = 0; |
| 1364 | |
| 1365 | /* Controls applicable to inactive channels */ |
| 1366 | if (cmd == DMA_SLAVE_CONFIG) { |
Russell King - ARM Linux | f0fd944 | 2011-01-03 22:45:57 +0000 | [diff] [blame] | 1367 | return dma_set_runtime_config(chan, |
| 1368 | (struct dma_slave_config *)arg); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1369 | } |
| 1370 | |
| 1371 | /* |
| 1372 | * Anything succeeds on channels with no physical allocation and |
| 1373 | * no queued transfers. |
| 1374 | */ |
| 1375 | spin_lock_irqsave(&plchan->lock, flags); |
| 1376 | if (!plchan->phychan && !plchan->at) { |
| 1377 | spin_unlock_irqrestore(&plchan->lock, flags); |
| 1378 | return 0; |
| 1379 | } |
| 1380 | |
| 1381 | switch (cmd) { |
| 1382 | case DMA_TERMINATE_ALL: |
| 1383 | plchan->state = PL08X_CHAN_IDLE; |
| 1384 | |
| 1385 | if (plchan->phychan) { |
Russell King - ARM Linux | fb52621 | 2011-01-27 12:32:53 +0000 | [diff] [blame] | 1386 | pl08x_terminate_phy_chan(pl08x, plchan->phychan); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1387 | |
| 1388 | /* |
| 1389 | * Mark physical channel as free and free any slave |
| 1390 | * signal |
| 1391 | */ |
Russell King - ARM Linux | 8c8cc2b | 2011-01-03 22:36:09 +0000 | [diff] [blame] | 1392 | release_phy_channel(plchan); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1393 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1394 | /* Dequeue jobs and free LLIs */ |
| 1395 | if (plchan->at) { |
| 1396 | pl08x_free_txd(pl08x, plchan->at); |
| 1397 | plchan->at = NULL; |
| 1398 | } |
| 1399 | /* Dequeue jobs not yet fired as well */ |
| 1400 | pl08x_free_txd_list(pl08x, plchan); |
| 1401 | break; |
| 1402 | case DMA_PAUSE: |
| 1403 | pl08x_pause_phy_chan(plchan->phychan); |
| 1404 | plchan->state = PL08X_CHAN_PAUSED; |
| 1405 | break; |
| 1406 | case DMA_RESUME: |
| 1407 | pl08x_resume_phy_chan(plchan->phychan); |
| 1408 | plchan->state = PL08X_CHAN_RUNNING; |
| 1409 | break; |
| 1410 | default: |
| 1411 | /* Unknown command */ |
| 1412 | ret = -ENXIO; |
| 1413 | break; |
| 1414 | } |
| 1415 | |
| 1416 | spin_unlock_irqrestore(&plchan->lock, flags); |
| 1417 | |
| 1418 | return ret; |
| 1419 | } |
| 1420 | |
| 1421 | bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) |
| 1422 | { |
| 1423 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); |
| 1424 | char *name = chan_id; |
| 1425 | |
| 1426 | /* Check that the channel is not taken! */ |
| 1427 | if (!strcmp(plchan->name, name)) |
| 1428 | return true; |
| 1429 | |
| 1430 | return false; |
| 1431 | } |
| 1432 | |
| 1433 | /* |
| 1434 | * Just check that the device is there and active |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 1435 | * TODO: turn this bit on/off depending on the number of physical channels |
| 1436 | * actually used, if it is zero... well shut it off. That will save some |
| 1437 | * power. Cut the clock at the same time. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1438 | */ |
| 1439 | static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) |
| 1440 | { |
Viresh Kumar | 48a59ef | 2011-08-05 15:32:34 +0530 | [diff] [blame] | 1441 | writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1442 | } |
| 1443 | |
Russell King - ARM Linux | 3d992e1 | 2011-01-03 22:44:16 +0000 | [diff] [blame] | 1444 | static void pl08x_unmap_buffers(struct pl08x_txd *txd) |
| 1445 | { |
| 1446 | struct device *dev = txd->tx.chan->device->dev; |
| 1447 | |
| 1448 | if (!(txd->tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { |
| 1449 | if (txd->tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE) |
| 1450 | dma_unmap_single(dev, txd->src_addr, txd->len, |
| 1451 | DMA_TO_DEVICE); |
| 1452 | else |
| 1453 | dma_unmap_page(dev, txd->src_addr, txd->len, |
| 1454 | DMA_TO_DEVICE); |
| 1455 | } |
| 1456 | if (!(txd->tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { |
| 1457 | if (txd->tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE) |
| 1458 | dma_unmap_single(dev, txd->dst_addr, txd->len, |
| 1459 | DMA_FROM_DEVICE); |
| 1460 | else |
| 1461 | dma_unmap_page(dev, txd->dst_addr, txd->len, |
| 1462 | DMA_FROM_DEVICE); |
| 1463 | } |
| 1464 | } |
| 1465 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1466 | static void pl08x_tasklet(unsigned long data) |
| 1467 | { |
| 1468 | struct pl08x_dma_chan *plchan = (struct pl08x_dma_chan *) data; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1469 | struct pl08x_driver_data *pl08x = plchan->host; |
Russell King - ARM Linux | 858c21c | 2011-01-03 22:41:34 +0000 | [diff] [blame] | 1470 | struct pl08x_txd *txd; |
Russell King - ARM Linux | bf072af | 2011-01-03 22:31:24 +0000 | [diff] [blame] | 1471 | unsigned long flags; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1472 | |
Russell King - ARM Linux | bf072af | 2011-01-03 22:31:24 +0000 | [diff] [blame] | 1473 | spin_lock_irqsave(&plchan->lock, flags); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1474 | |
Russell King - ARM Linux | 858c21c | 2011-01-03 22:41:34 +0000 | [diff] [blame] | 1475 | txd = plchan->at; |
| 1476 | plchan->at = NULL; |
| 1477 | |
| 1478 | if (txd) { |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 1479 | /* Update last completed */ |
Russell King - ARM Linux | 858c21c | 2011-01-03 22:41:34 +0000 | [diff] [blame] | 1480 | plchan->lc = txd->tx.cookie; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1481 | } |
Russell King - ARM Linux | 8087aac | 2011-01-03 22:45:17 +0000 | [diff] [blame] | 1482 | |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 1483 | /* If a new descriptor is queued, set it up plchan->at is NULL here */ |
Russell King - ARM Linux | 15c1723 | 2011-01-03 22:44:36 +0000 | [diff] [blame] | 1484 | if (!list_empty(&plchan->pend_list)) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1485 | struct pl08x_txd *next; |
| 1486 | |
Russell King - ARM Linux | 15c1723 | 2011-01-03 22:44:36 +0000 | [diff] [blame] | 1487 | next = list_first_entry(&plchan->pend_list, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1488 | struct pl08x_txd, |
| 1489 | node); |
| 1490 | list_del(&next->node); |
Russell King - ARM Linux | c885bee | 2011-01-03 22:38:52 +0000 | [diff] [blame] | 1491 | |
| 1492 | pl08x_start_txd(plchan, next); |
Russell King - ARM Linux | 8087aac | 2011-01-03 22:45:17 +0000 | [diff] [blame] | 1493 | } else if (plchan->phychan_hold) { |
| 1494 | /* |
| 1495 | * This channel is still in use - we have a new txd being |
| 1496 | * prepared and will soon be queued. Don't give up the |
| 1497 | * physical channel. |
| 1498 | */ |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1499 | } else { |
| 1500 | struct pl08x_dma_chan *waiting = NULL; |
| 1501 | |
| 1502 | /* |
| 1503 | * No more jobs, so free up the physical channel |
| 1504 | * Free any allocated signal on slave transfers too |
| 1505 | */ |
Russell King - ARM Linux | 8c8cc2b | 2011-01-03 22:36:09 +0000 | [diff] [blame] | 1506 | release_phy_channel(plchan); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1507 | plchan->state = PL08X_CHAN_IDLE; |
| 1508 | |
| 1509 | /* |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 1510 | * And NOW before anyone else can grab that free:d up |
| 1511 | * physical channel, see if there is some memcpy pending |
| 1512 | * that seriously needs to start because of being stacked |
| 1513 | * up while we were choking the physical channels with data. |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1514 | */ |
| 1515 | list_for_each_entry(waiting, &pl08x->memcpy.channels, |
| 1516 | chan.device_node) { |
Viresh Kumar | 3e27ee8 | 2011-08-05 15:32:27 +0530 | [diff] [blame] | 1517 | if (waiting->state == PL08X_CHAN_WAITING && |
| 1518 | waiting->waiting != NULL) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1519 | int ret; |
| 1520 | |
| 1521 | /* This should REALLY not fail now */ |
| 1522 | ret = prep_phy_channel(waiting, |
| 1523 | waiting->waiting); |
| 1524 | BUG_ON(ret); |
Russell King - ARM Linux | 8087aac | 2011-01-03 22:45:17 +0000 | [diff] [blame] | 1525 | waiting->phychan_hold--; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1526 | waiting->state = PL08X_CHAN_RUNNING; |
| 1527 | waiting->waiting = NULL; |
| 1528 | pl08x_issue_pending(&waiting->chan); |
| 1529 | break; |
| 1530 | } |
| 1531 | } |
| 1532 | } |
| 1533 | |
Russell King - ARM Linux | bf072af | 2011-01-03 22:31:24 +0000 | [diff] [blame] | 1534 | spin_unlock_irqrestore(&plchan->lock, flags); |
Russell King - ARM Linux | 858c21c | 2011-01-03 22:41:34 +0000 | [diff] [blame] | 1535 | |
Russell King - ARM Linux | 3d992e1 | 2011-01-03 22:44:16 +0000 | [diff] [blame] | 1536 | if (txd) { |
| 1537 | dma_async_tx_callback callback = txd->tx.callback; |
| 1538 | void *callback_param = txd->tx.callback_param; |
| 1539 | |
| 1540 | /* Don't try to unmap buffers on slave channels */ |
| 1541 | if (!plchan->slave) |
| 1542 | pl08x_unmap_buffers(txd); |
| 1543 | |
| 1544 | /* Free the descriptor */ |
| 1545 | spin_lock_irqsave(&plchan->lock, flags); |
| 1546 | pl08x_free_txd(pl08x, txd); |
| 1547 | spin_unlock_irqrestore(&plchan->lock, flags); |
| 1548 | |
| 1549 | /* Callback to signal completion */ |
| 1550 | if (callback) |
| 1551 | callback(callback_param); |
| 1552 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1553 | } |
| 1554 | |
| 1555 | static irqreturn_t pl08x_irq(int irq, void *dev) |
| 1556 | { |
| 1557 | struct pl08x_driver_data *pl08x = dev; |
Viresh Kumar | 28da283 | 2011-08-05 15:32:36 +0530 | [diff] [blame] | 1558 | u32 mask = 0, err, tc, i; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1559 | |
Viresh Kumar | 28da283 | 2011-08-05 15:32:36 +0530 | [diff] [blame] | 1560 | /* check & clear - ERR & TC interrupts */ |
| 1561 | err = readl(pl08x->base + PL080_ERR_STATUS); |
| 1562 | if (err) { |
| 1563 | dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n", |
| 1564 | __func__, err); |
| 1565 | writel(err, pl08x->base + PL080_ERR_CLEAR); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1566 | } |
Viresh Kumar | 28da283 | 2011-08-05 15:32:36 +0530 | [diff] [blame] | 1567 | tc = readl(pl08x->base + PL080_INT_STATUS); |
| 1568 | if (tc) |
| 1569 | writel(tc, pl08x->base + PL080_TC_CLEAR); |
| 1570 | |
| 1571 | if (!err && !tc) |
| 1572 | return IRQ_NONE; |
| 1573 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1574 | for (i = 0; i < pl08x->vd->channels; i++) { |
Viresh Kumar | 28da283 | 2011-08-05 15:32:36 +0530 | [diff] [blame] | 1575 | if (((1 << i) & err) || ((1 << i) & tc)) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1576 | /* Locate physical channel */ |
| 1577 | struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i]; |
| 1578 | struct pl08x_dma_chan *plchan = phychan->serving; |
| 1579 | |
Viresh Kumar | 28da283 | 2011-08-05 15:32:36 +0530 | [diff] [blame] | 1580 | if (!plchan) { |
| 1581 | dev_err(&pl08x->adev->dev, |
| 1582 | "%s Error TC interrupt on unused channel: 0x%08x\n", |
| 1583 | __func__, i); |
| 1584 | continue; |
| 1585 | } |
| 1586 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1587 | /* Schedule tasklet on this channel */ |
| 1588 | tasklet_schedule(&plchan->tasklet); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1589 | mask |= (1 << i); |
| 1590 | } |
| 1591 | } |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1592 | |
| 1593 | return mask ? IRQ_HANDLED : IRQ_NONE; |
| 1594 | } |
| 1595 | |
Russell King - ARM Linux | 121c847 | 2011-07-21 17:13:48 +0100 | [diff] [blame] | 1596 | static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan) |
| 1597 | { |
| 1598 | u32 cctl = pl08x_cctl(chan->cd->cctl); |
| 1599 | |
| 1600 | chan->slave = true; |
| 1601 | chan->name = chan->cd->bus_id; |
| 1602 | chan->src_addr = chan->cd->addr; |
| 1603 | chan->dst_addr = chan->cd->addr; |
| 1604 | chan->src_cctl = cctl | PL080_CONTROL_DST_INCR | |
| 1605 | pl08x_select_bus(chan->cd->periph_buses, chan->host->mem_buses); |
| 1606 | chan->dst_cctl = cctl | PL080_CONTROL_SRC_INCR | |
| 1607 | pl08x_select_bus(chan->host->mem_buses, chan->cd->periph_buses); |
| 1608 | } |
| 1609 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1610 | /* |
| 1611 | * Initialise the DMAC memcpy/slave channels. |
| 1612 | * Make a local wrapper to hold required data |
| 1613 | */ |
| 1614 | static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, |
Viresh Kumar | 3e27ee8 | 2011-08-05 15:32:27 +0530 | [diff] [blame] | 1615 | struct dma_device *dmadev, unsigned int channels, bool slave) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1616 | { |
| 1617 | struct pl08x_dma_chan *chan; |
| 1618 | int i; |
| 1619 | |
| 1620 | INIT_LIST_HEAD(&dmadev->channels); |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 1621 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1622 | /* |
| 1623 | * Register as many many memcpy as we have physical channels, |
| 1624 | * we won't always be able to use all but the code will have |
| 1625 | * to cope with that situation. |
| 1626 | */ |
| 1627 | for (i = 0; i < channels; i++) { |
Viresh Kumar | b201c11 | 2011-08-05 15:32:29 +0530 | [diff] [blame] | 1628 | chan = kzalloc(sizeof(*chan), GFP_KERNEL); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1629 | if (!chan) { |
| 1630 | dev_err(&pl08x->adev->dev, |
| 1631 | "%s no memory for channel\n", __func__); |
| 1632 | return -ENOMEM; |
| 1633 | } |
| 1634 | |
| 1635 | chan->host = pl08x; |
| 1636 | chan->state = PL08X_CHAN_IDLE; |
| 1637 | |
| 1638 | if (slave) { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1639 | chan->cd = &pl08x->pd->slave_channels[i]; |
Russell King - ARM Linux | 121c847 | 2011-07-21 17:13:48 +0100 | [diff] [blame] | 1640 | pl08x_dma_slave_init(chan); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1641 | } else { |
| 1642 | chan->cd = &pl08x->pd->memcpy_channel; |
| 1643 | chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); |
| 1644 | if (!chan->name) { |
| 1645 | kfree(chan); |
| 1646 | return -ENOMEM; |
| 1647 | } |
| 1648 | } |
Russell King - ARM Linux | b58b6b5 | 2011-01-03 22:34:48 +0000 | [diff] [blame] | 1649 | if (chan->cd->circular_buffer) { |
| 1650 | dev_err(&pl08x->adev->dev, |
| 1651 | "channel %s: circular buffers not supported\n", |
| 1652 | chan->name); |
| 1653 | kfree(chan); |
| 1654 | continue; |
| 1655 | } |
Viresh Kumar | 175a5e6 | 2011-08-05 15:32:32 +0530 | [diff] [blame] | 1656 | dev_dbg(&pl08x->adev->dev, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1657 | "initialize virtual channel \"%s\"\n", |
| 1658 | chan->name); |
| 1659 | |
| 1660 | chan->chan.device = dmadev; |
Russell King - ARM Linux | 91aa5fa | 2011-01-03 22:31:04 +0000 | [diff] [blame] | 1661 | chan->chan.cookie = 0; |
| 1662 | chan->lc = 0; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1663 | |
| 1664 | spin_lock_init(&chan->lock); |
Russell King - ARM Linux | 15c1723 | 2011-01-03 22:44:36 +0000 | [diff] [blame] | 1665 | INIT_LIST_HEAD(&chan->pend_list); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1666 | tasklet_init(&chan->tasklet, pl08x_tasklet, |
| 1667 | (unsigned long) chan); |
| 1668 | |
| 1669 | list_add_tail(&chan->chan.device_node, &dmadev->channels); |
| 1670 | } |
| 1671 | dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n", |
| 1672 | i, slave ? "slave" : "memcpy"); |
| 1673 | return i; |
| 1674 | } |
| 1675 | |
| 1676 | static void pl08x_free_virtual_channels(struct dma_device *dmadev) |
| 1677 | { |
| 1678 | struct pl08x_dma_chan *chan = NULL; |
| 1679 | struct pl08x_dma_chan *next; |
| 1680 | |
| 1681 | list_for_each_entry_safe(chan, |
| 1682 | next, &dmadev->channels, chan.device_node) { |
| 1683 | list_del(&chan->chan.device_node); |
| 1684 | kfree(chan); |
| 1685 | } |
| 1686 | } |
| 1687 | |
| 1688 | #ifdef CONFIG_DEBUG_FS |
| 1689 | static const char *pl08x_state_str(enum pl08x_dma_chan_state state) |
| 1690 | { |
| 1691 | switch (state) { |
| 1692 | case PL08X_CHAN_IDLE: |
| 1693 | return "idle"; |
| 1694 | case PL08X_CHAN_RUNNING: |
| 1695 | return "running"; |
| 1696 | case PL08X_CHAN_PAUSED: |
| 1697 | return "paused"; |
| 1698 | case PL08X_CHAN_WAITING: |
| 1699 | return "waiting"; |
| 1700 | default: |
| 1701 | break; |
| 1702 | } |
| 1703 | return "UNKNOWN STATE"; |
| 1704 | } |
| 1705 | |
| 1706 | static int pl08x_debugfs_show(struct seq_file *s, void *data) |
| 1707 | { |
| 1708 | struct pl08x_driver_data *pl08x = s->private; |
| 1709 | struct pl08x_dma_chan *chan; |
| 1710 | struct pl08x_phy_chan *ch; |
| 1711 | unsigned long flags; |
| 1712 | int i; |
| 1713 | |
| 1714 | seq_printf(s, "PL08x physical channels:\n"); |
| 1715 | seq_printf(s, "CHANNEL:\tUSER:\n"); |
| 1716 | seq_printf(s, "--------\t-----\n"); |
| 1717 | for (i = 0; i < pl08x->vd->channels; i++) { |
| 1718 | struct pl08x_dma_chan *virt_chan; |
| 1719 | |
| 1720 | ch = &pl08x->phy_chans[i]; |
| 1721 | |
| 1722 | spin_lock_irqsave(&ch->lock, flags); |
| 1723 | virt_chan = ch->serving; |
| 1724 | |
| 1725 | seq_printf(s, "%d\t\t%s\n", |
| 1726 | ch->id, virt_chan ? virt_chan->name : "(none)"); |
| 1727 | |
| 1728 | spin_unlock_irqrestore(&ch->lock, flags); |
| 1729 | } |
| 1730 | |
| 1731 | seq_printf(s, "\nPL08x virtual memcpy channels:\n"); |
| 1732 | seq_printf(s, "CHANNEL:\tSTATE:\n"); |
| 1733 | seq_printf(s, "--------\t------\n"); |
| 1734 | list_for_each_entry(chan, &pl08x->memcpy.channels, chan.device_node) { |
Russell King - ARM Linux | 3e2a037 | 2011-01-03 22:32:46 +0000 | [diff] [blame] | 1735 | seq_printf(s, "%s\t\t%s\n", chan->name, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1736 | pl08x_state_str(chan->state)); |
| 1737 | } |
| 1738 | |
| 1739 | seq_printf(s, "\nPL08x virtual slave channels:\n"); |
| 1740 | seq_printf(s, "CHANNEL:\tSTATE:\n"); |
| 1741 | seq_printf(s, "--------\t------\n"); |
| 1742 | list_for_each_entry(chan, &pl08x->slave.channels, chan.device_node) { |
Russell King - ARM Linux | 3e2a037 | 2011-01-03 22:32:46 +0000 | [diff] [blame] | 1743 | seq_printf(s, "%s\t\t%s\n", chan->name, |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1744 | pl08x_state_str(chan->state)); |
| 1745 | } |
| 1746 | |
| 1747 | return 0; |
| 1748 | } |
| 1749 | |
| 1750 | static int pl08x_debugfs_open(struct inode *inode, struct file *file) |
| 1751 | { |
| 1752 | return single_open(file, pl08x_debugfs_show, inode->i_private); |
| 1753 | } |
| 1754 | |
| 1755 | static const struct file_operations pl08x_debugfs_operations = { |
| 1756 | .open = pl08x_debugfs_open, |
| 1757 | .read = seq_read, |
| 1758 | .llseek = seq_lseek, |
| 1759 | .release = single_release, |
| 1760 | }; |
| 1761 | |
| 1762 | static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) |
| 1763 | { |
| 1764 | /* Expose a simple debugfs interface to view all clocks */ |
Viresh Kumar | 3e27ee8 | 2011-08-05 15:32:27 +0530 | [diff] [blame] | 1765 | (void) debugfs_create_file(dev_name(&pl08x->adev->dev), |
| 1766 | S_IFREG | S_IRUGO, NULL, pl08x, |
| 1767 | &pl08x_debugfs_operations); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1768 | } |
| 1769 | |
| 1770 | #else |
| 1771 | static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) |
| 1772 | { |
| 1773 | } |
| 1774 | #endif |
| 1775 | |
Russell King | aa25afa | 2011-02-19 15:55:00 +0000 | [diff] [blame] | 1776 | static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1777 | { |
| 1778 | struct pl08x_driver_data *pl08x; |
Russell King - ARM Linux | f96ca9e | 2011-01-03 22:35:08 +0000 | [diff] [blame] | 1779 | const struct vendor_data *vd = id->data; |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1780 | int ret = 0; |
| 1781 | int i; |
| 1782 | |
| 1783 | ret = amba_request_regions(adev, NULL); |
| 1784 | if (ret) |
| 1785 | return ret; |
| 1786 | |
| 1787 | /* Create the driver state holder */ |
Viresh Kumar | b201c11 | 2011-08-05 15:32:29 +0530 | [diff] [blame] | 1788 | pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1789 | if (!pl08x) { |
| 1790 | ret = -ENOMEM; |
| 1791 | goto out_no_pl08x; |
| 1792 | } |
| 1793 | |
Viresh Kumar | b7b6018 | 2011-08-05 15:32:33 +0530 | [diff] [blame] | 1794 | pm_runtime_set_active(&adev->dev); |
| 1795 | pm_runtime_enable(&adev->dev); |
| 1796 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1797 | /* Initialize memcpy engine */ |
| 1798 | dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); |
| 1799 | pl08x->memcpy.dev = &adev->dev; |
| 1800 | pl08x->memcpy.device_alloc_chan_resources = pl08x_alloc_chan_resources; |
| 1801 | pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources; |
| 1802 | pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy; |
| 1803 | pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; |
| 1804 | pl08x->memcpy.device_tx_status = pl08x_dma_tx_status; |
| 1805 | pl08x->memcpy.device_issue_pending = pl08x_issue_pending; |
| 1806 | pl08x->memcpy.device_control = pl08x_control; |
| 1807 | |
| 1808 | /* Initialize slave engine */ |
| 1809 | dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask); |
| 1810 | pl08x->slave.dev = &adev->dev; |
| 1811 | pl08x->slave.device_alloc_chan_resources = pl08x_alloc_chan_resources; |
| 1812 | pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources; |
| 1813 | pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; |
| 1814 | pl08x->slave.device_tx_status = pl08x_dma_tx_status; |
| 1815 | pl08x->slave.device_issue_pending = pl08x_issue_pending; |
| 1816 | pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg; |
| 1817 | pl08x->slave.device_control = pl08x_control; |
| 1818 | |
| 1819 | /* Get the platform data */ |
| 1820 | pl08x->pd = dev_get_platdata(&adev->dev); |
| 1821 | if (!pl08x->pd) { |
| 1822 | dev_err(&adev->dev, "no platform data supplied\n"); |
| 1823 | goto out_no_platdata; |
| 1824 | } |
| 1825 | |
| 1826 | /* Assign useful pointers to the driver state */ |
| 1827 | pl08x->adev = adev; |
| 1828 | pl08x->vd = vd; |
| 1829 | |
Russell King - ARM Linux | 30749cb | 2011-01-03 22:41:13 +0000 | [diff] [blame] | 1830 | /* By default, AHB1 only. If dualmaster, from platform */ |
| 1831 | pl08x->lli_buses = PL08X_AHB1; |
| 1832 | pl08x->mem_buses = PL08X_AHB1; |
| 1833 | if (pl08x->vd->dualmaster) { |
| 1834 | pl08x->lli_buses = pl08x->pd->lli_buses; |
| 1835 | pl08x->mem_buses = pl08x->pd->mem_buses; |
| 1836 | } |
| 1837 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1838 | /* A DMA memory pool for LLIs, align on 1-byte boundary */ |
| 1839 | pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev, |
| 1840 | PL08X_LLI_TSFR_SIZE, PL08X_ALIGN, 0); |
| 1841 | if (!pl08x->pool) { |
| 1842 | ret = -ENOMEM; |
| 1843 | goto out_no_lli_pool; |
| 1844 | } |
| 1845 | |
| 1846 | spin_lock_init(&pl08x->lock); |
| 1847 | |
| 1848 | pl08x->base = ioremap(adev->res.start, resource_size(&adev->res)); |
| 1849 | if (!pl08x->base) { |
| 1850 | ret = -ENOMEM; |
| 1851 | goto out_no_ioremap; |
| 1852 | } |
| 1853 | |
| 1854 | /* Turn on the PL08x */ |
| 1855 | pl08x_ensure_on(pl08x); |
| 1856 | |
Russell King - ARM Linux | 94ae852 | 2011-01-16 20:18:05 +0000 | [diff] [blame] | 1857 | /* Attach the interrupt handler */ |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1858 | writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR); |
| 1859 | writel(0x000000FF, pl08x->base + PL080_TC_CLEAR); |
| 1860 | |
| 1861 | ret = request_irq(adev->irq[0], pl08x_irq, IRQF_DISABLED, |
Russell King - ARM Linux | b05cd8f | 2011-01-03 22:33:26 +0000 | [diff] [blame] | 1862 | DRIVER_NAME, pl08x); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1863 | if (ret) { |
| 1864 | dev_err(&adev->dev, "%s failed to request interrupt %d\n", |
| 1865 | __func__, adev->irq[0]); |
| 1866 | goto out_no_irq; |
| 1867 | } |
| 1868 | |
| 1869 | /* Initialize physical channels */ |
Viresh Kumar | b201c11 | 2011-08-05 15:32:29 +0530 | [diff] [blame] | 1870 | pl08x->phy_chans = kmalloc((vd->channels * sizeof(*pl08x->phy_chans)), |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1871 | GFP_KERNEL); |
| 1872 | if (!pl08x->phy_chans) { |
| 1873 | dev_err(&adev->dev, "%s failed to allocate " |
| 1874 | "physical channel holders\n", |
| 1875 | __func__); |
| 1876 | goto out_no_phychans; |
| 1877 | } |
| 1878 | |
| 1879 | for (i = 0; i < vd->channels; i++) { |
| 1880 | struct pl08x_phy_chan *ch = &pl08x->phy_chans[i]; |
| 1881 | |
| 1882 | ch->id = i; |
| 1883 | ch->base = pl08x->base + PL080_Cx_BASE(i); |
| 1884 | spin_lock_init(&ch->lock); |
| 1885 | ch->serving = NULL; |
| 1886 | ch->signal = -1; |
Viresh Kumar | 175a5e6 | 2011-08-05 15:32:32 +0530 | [diff] [blame] | 1887 | dev_dbg(&adev->dev, "physical channel %d is %s\n", |
| 1888 | i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE"); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1889 | } |
| 1890 | |
| 1891 | /* Register as many memcpy channels as there are physical channels */ |
| 1892 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy, |
| 1893 | pl08x->vd->channels, false); |
| 1894 | if (ret <= 0) { |
| 1895 | dev_warn(&pl08x->adev->dev, |
| 1896 | "%s failed to enumerate memcpy channels - %d\n", |
| 1897 | __func__, ret); |
| 1898 | goto out_no_memcpy; |
| 1899 | } |
| 1900 | pl08x->memcpy.chancnt = ret; |
| 1901 | |
| 1902 | /* Register slave channels */ |
| 1903 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave, |
Viresh Kumar | 3e27ee8 | 2011-08-05 15:32:27 +0530 | [diff] [blame] | 1904 | pl08x->pd->num_slave_channels, true); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1905 | if (ret <= 0) { |
| 1906 | dev_warn(&pl08x->adev->dev, |
| 1907 | "%s failed to enumerate slave channels - %d\n", |
| 1908 | __func__, ret); |
| 1909 | goto out_no_slave; |
| 1910 | } |
| 1911 | pl08x->slave.chancnt = ret; |
| 1912 | |
| 1913 | ret = dma_async_device_register(&pl08x->memcpy); |
| 1914 | if (ret) { |
| 1915 | dev_warn(&pl08x->adev->dev, |
| 1916 | "%s failed to register memcpy as an async device - %d\n", |
| 1917 | __func__, ret); |
| 1918 | goto out_no_memcpy_reg; |
| 1919 | } |
| 1920 | |
| 1921 | ret = dma_async_device_register(&pl08x->slave); |
| 1922 | if (ret) { |
| 1923 | dev_warn(&pl08x->adev->dev, |
| 1924 | "%s failed to register slave as an async device - %d\n", |
| 1925 | __func__, ret); |
| 1926 | goto out_no_slave_reg; |
| 1927 | } |
| 1928 | |
| 1929 | amba_set_drvdata(adev, pl08x); |
| 1930 | init_pl08x_debugfs(pl08x); |
Russell King - ARM Linux | b05cd8f | 2011-01-03 22:33:26 +0000 | [diff] [blame] | 1931 | dev_info(&pl08x->adev->dev, "DMA: PL%03x rev%u at 0x%08llx irq %d\n", |
| 1932 | amba_part(adev), amba_rev(adev), |
| 1933 | (unsigned long long)adev->res.start, adev->irq[0]); |
Viresh Kumar | b7b6018 | 2011-08-05 15:32:33 +0530 | [diff] [blame] | 1934 | |
| 1935 | pm_runtime_put(&adev->dev); |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1936 | return 0; |
| 1937 | |
| 1938 | out_no_slave_reg: |
| 1939 | dma_async_device_unregister(&pl08x->memcpy); |
| 1940 | out_no_memcpy_reg: |
| 1941 | pl08x_free_virtual_channels(&pl08x->slave); |
| 1942 | out_no_slave: |
| 1943 | pl08x_free_virtual_channels(&pl08x->memcpy); |
| 1944 | out_no_memcpy: |
| 1945 | kfree(pl08x->phy_chans); |
| 1946 | out_no_phychans: |
| 1947 | free_irq(adev->irq[0], pl08x); |
| 1948 | out_no_irq: |
| 1949 | iounmap(pl08x->base); |
| 1950 | out_no_ioremap: |
| 1951 | dma_pool_destroy(pl08x->pool); |
| 1952 | out_no_lli_pool: |
| 1953 | out_no_platdata: |
Viresh Kumar | b7b6018 | 2011-08-05 15:32:33 +0530 | [diff] [blame] | 1954 | pm_runtime_put(&adev->dev); |
| 1955 | pm_runtime_disable(&adev->dev); |
| 1956 | |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1957 | kfree(pl08x); |
| 1958 | out_no_pl08x: |
| 1959 | amba_release_regions(adev); |
| 1960 | return ret; |
| 1961 | } |
| 1962 | |
| 1963 | /* PL080 has 8 channels and the PL080 have just 2 */ |
| 1964 | static struct vendor_data vendor_pl080 = { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1965 | .channels = 8, |
| 1966 | .dualmaster = true, |
| 1967 | }; |
| 1968 | |
| 1969 | static struct vendor_data vendor_pl081 = { |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 1970 | .channels = 2, |
| 1971 | .dualmaster = false, |
| 1972 | }; |
| 1973 | |
| 1974 | static struct amba_id pl08x_ids[] = { |
| 1975 | /* PL080 */ |
| 1976 | { |
| 1977 | .id = 0x00041080, |
| 1978 | .mask = 0x000fffff, |
| 1979 | .data = &vendor_pl080, |
| 1980 | }, |
| 1981 | /* PL081 */ |
| 1982 | { |
| 1983 | .id = 0x00041081, |
| 1984 | .mask = 0x000fffff, |
| 1985 | .data = &vendor_pl081, |
| 1986 | }, |
| 1987 | /* Nomadik 8815 PL080 variant */ |
| 1988 | { |
| 1989 | .id = 0x00280880, |
| 1990 | .mask = 0x00ffffff, |
| 1991 | .data = &vendor_pl080, |
| 1992 | }, |
| 1993 | { 0, 0 }, |
| 1994 | }; |
| 1995 | |
| 1996 | static struct amba_driver pl08x_amba_driver = { |
| 1997 | .drv.name = DRIVER_NAME, |
| 1998 | .id_table = pl08x_ids, |
| 1999 | .probe = pl08x_probe, |
| 2000 | }; |
| 2001 | |
| 2002 | static int __init pl08x_init(void) |
| 2003 | { |
| 2004 | int retval; |
| 2005 | retval = amba_driver_register(&pl08x_amba_driver); |
| 2006 | if (retval) |
| 2007 | printk(KERN_WARNING DRIVER_NAME |
Russell King - ARM Linux | e8b5e11 | 2011-01-03 22:30:24 +0000 | [diff] [blame] | 2008 | "failed to register as an AMBA device (%d)\n", |
Linus Walleij | e8689e6 | 2010-09-28 15:57:37 +0200 | [diff] [blame] | 2009 | retval); |
| 2010 | return retval; |
| 2011 | } |
| 2012 | subsys_initcall(pl08x_init); |