dmaengine: Driver support for FSL RaidEngine device.

The RaidEngine is a new FSL hardware used for Raid5/6 acceration.
This patch enables the RaidEngine functionality and provides
hardware offloading capability for memcpy, xor and pq computation.
It works with async_tx.
Signed-off-by: NHarninder Rai <harninder.rai@freescale.com>
Signed-off-by: NXuelin Shi <xuelin.shi@freescale.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>

drivers/dma/Kconfig

@@ -125,6 +125,17 @@ config FSL_DMA
 	  EloPlus is on mpc85xx and mpc86xx and Pxxx parts, and the Elo3 is on
 	  some Txxx and Bxxx parts.
 
+config FSL_RAID
+        tristate "Freescale RAID engine Support"
+        depends on FSL_SOC && !ASYNC_TX_ENABLE_CHANNEL_SWITCH
+        select DMA_ENGINE
+        select DMA_ENGINE_RAID
+        ---help---
+          Enable support for Freescale RAID Engine. RAID Engine is
+          available on some QorIQ SoCs (like P5020/P5040). It has
+          the capability to offload memcpy, xor and pq computation
+	  for raid5/6.
+
 config MPC512X_DMA
 	tristate "Freescale MPC512x built-in DMA engine support"
 	depends on PPC_MPC512x || PPC_MPC831x

drivers/dma/Makefile

@@ -45,6 +45,7 @@ obj-$(CONFIG_DMA_JZ4780) += dma-jz4780.o
 obj-$(CONFIG_TI_CPPI41) += cppi41.o
 obj-$(CONFIG_K3_DMA) += k3dma.o
 obj-$(CONFIG_MOXART_DMA) += moxart-dma.o
+obj-$(CONFIG_FSL_RAID) += fsl_raid.o
 obj-$(CONFIG_FSL_EDMA) += fsl-edma.o
 obj-$(CONFIG_QCOM_BAM_DMA) += qcom_bam_dma.o
 obj-y += xilinx/

drivers/dma/fsl_raid.h

+/*
+ * drivers/dma/fsl_raid.h
+ *
+ * Freescale RAID Engine device driver
+ *
+ * Author:
+ *	Harninder Rai <harninder.rai@freescale.com>
+ *	Naveen Burmi <naveenburmi@freescale.com>
+ *
+ * Rewrite:
+ *	Xuelin Shi <xuelin.shi@freescale.com>
+
+ * Copyright (c) 2010-2012 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of Freescale Semiconductor nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#define FSL_RE_MAX_CHANS		4
+#define FSL_RE_DPAA_MODE		BIT(30)
+#define FSL_RE_NON_DPAA_MODE		BIT(31)
+#define FSL_RE_GFM_POLY			0x1d000000
+#define FSL_RE_ADD_JOB(x)		((x) << 16)
+#define FSL_RE_RMVD_JOB(x)		((x) << 16)
+#define FSL_RE_CFG1_CBSI		0x08000000
+#define FSL_RE_CFG1_CBS0		0x00080000
+#define FSL_RE_SLOT_FULL_SHIFT		8
+#define FSL_RE_SLOT_FULL(x)		((x) >> FSL_RE_SLOT_FULL_SHIFT)
+#define FSL_RE_SLOT_AVAIL_SHIFT		8
+#define FSL_RE_SLOT_AVAIL(x)		((x) >> FSL_RE_SLOT_AVAIL_SHIFT)
+#define FSL_RE_PQ_OPCODE		0x1B
+#define FSL_RE_XOR_OPCODE		0x1A
+#define FSL_RE_MOVE_OPCODE		0x8
+#define FSL_RE_FRAME_ALIGN		16
+#define FSL_RE_BLOCK_SIZE		0x3 /* 4096 bytes */
+#define FSL_RE_CACHEABLE_IO		0x0
+#define FSL_RE_BUFFER_OUTPUT		0x0
+#define FSL_RE_INTR_ON_ERROR		0x1
+#define FSL_RE_DATA_DEP			0x1
+#define FSL_RE_ENABLE_DPI		0x0
+#define FSL_RE_RING_SIZE		0x400
+#define FSL_RE_RING_SIZE_MASK		(FSL_RE_RING_SIZE - 1)
+#define FSL_RE_RING_SIZE_SHIFT		8
+#define FSL_RE_ADDR_BIT_SHIFT		4
+#define FSL_RE_ADDR_BIT_MASK		(BIT(FSL_RE_ADDR_BIT_SHIFT) - 1)
+#define FSL_RE_ERROR			0x40000000
+#define FSL_RE_INTR			0x80000000
+#define FSL_RE_CLR_INTR			0x80000000
+#define FSL_RE_PAUSE			0x80000000
+#define FSL_RE_ENABLE			0x80000000
+#define FSL_RE_REG_LIODN_MASK		0x00000FFF
+
+#define FSL_RE_CDB_OPCODE_MASK		0xF8000000
+#define FSL_RE_CDB_OPCODE_SHIFT		27
+#define FSL_RE_CDB_EXCLEN_MASK		0x03000000
+#define FSL_RE_CDB_EXCLEN_SHIFT		24
+#define FSL_RE_CDB_EXCLQ1_MASK		0x00F00000
+#define FSL_RE_CDB_EXCLQ1_SHIFT		20
+#define FSL_RE_CDB_EXCLQ2_MASK		0x000F0000
+#define FSL_RE_CDB_EXCLQ2_SHIFT		16
+#define FSL_RE_CDB_BLKSIZE_MASK		0x0000C000
+#define FSL_RE_CDB_BLKSIZE_SHIFT	14
+#define FSL_RE_CDB_CACHE_MASK		0x00003000
+#define FSL_RE_CDB_CACHE_SHIFT		12
+#define FSL_RE_CDB_BUFFER_MASK		0x00000800
+#define FSL_RE_CDB_BUFFER_SHIFT		11
+#define FSL_RE_CDB_ERROR_MASK		0x00000400
+#define FSL_RE_CDB_ERROR_SHIFT		10
+#define FSL_RE_CDB_NRCS_MASK		0x0000003C
+#define FSL_RE_CDB_NRCS_SHIFT		6
+#define FSL_RE_CDB_DEPEND_MASK		0x00000008
+#define FSL_RE_CDB_DEPEND_SHIFT		3
+#define FSL_RE_CDB_DPI_MASK		0x00000004
+#define FSL_RE_CDB_DPI_SHIFT		2
+
+/*
+ * the largest cf block is 19*sizeof(struct cmpnd_frame), which is 304 bytes.
+ * here 19 = 1(cdb)+2(dest)+16(src), align to 64bytes, that is 320 bytes.
+ * the largest cdb block: struct pq_cdb which is 180 bytes, adding to cf block
+ * 320+180=500, align to 64bytes, that is 512 bytes.
+ */
+#define FSL_RE_CF_DESC_SIZE		320
+#define FSL_RE_CF_CDB_SIZE		512
+#define FSL_RE_CF_CDB_ALIGN		64
+
+struct fsl_re_ctrl {
+	/* General Configuration Registers */
+	__be32 global_config;	/* Global Configuration Register */
+	u8     rsvd1[4];
+	__be32 galois_field_config; /* Galois Field Configuration Register */
+	u8     rsvd2[4];
+	__be32 jq_wrr_config;   /* WRR Configuration register */
+	u8     rsvd3[4];
+	__be32 crc_config;	/* CRC Configuration register */
+	u8     rsvd4[228];
+	__be32 system_reset;	/* System Reset Register */
+	u8     rsvd5[252];
+	__be32 global_status;	/* Global Status Register */
+	u8     rsvd6[832];
+	__be32 re_liodn_base;	/* LIODN Base Register */
+	u8     rsvd7[1712];
+	__be32 re_version_id;	/* Version ID register of RE */
+	__be32 re_version_id_2; /* Version ID 2 register of RE */
+	u8     rsvd8[512];
+	__be32 host_config;	/* Host I/F Configuration Register */
+};
+
+struct fsl_re_chan_cfg {
+	/* Registers for JR interface */
+	__be32 jr_config_0;	/* Job Queue Configuration 0 Register */
+	__be32 jr_config_1;	/* Job Queue Configuration 1 Register */
+	__be32 jr_interrupt_status; /* Job Queue Interrupt Status Register */
+	u8     rsvd1[4];
+	__be32 jr_command;	/* Job Queue Command Register */
+	u8     rsvd2[4];
+	__be32 jr_status;	/* Job Queue Status Register */
+	u8     rsvd3[228];
+
+	/* Input Ring */
+	__be32 inbring_base_h;	/* Inbound Ring Base Address Register - High */
+	__be32 inbring_base_l;	/* Inbound Ring Base Address Register - Low */
+	__be32 inbring_size;	/* Inbound Ring Size Register */
+	u8     rsvd4[4];
+	__be32 inbring_slot_avail; /* Inbound Ring Slot Available Register */
+	u8     rsvd5[4];
+	__be32 inbring_add_job;	/* Inbound Ring Add Job Register */
+	u8     rsvd6[4];
+	__be32 inbring_cnsmr_indx; /* Inbound Ring Consumer Index Register */
+	u8     rsvd7[220];
+
+	/* Output Ring */
+	__be32 oubring_base_h;	/* Outbound Ring Base Address Register - High */
+	__be32 oubring_base_l;	/* Outbound Ring Base Address Register - Low */
+	__be32 oubring_size;	/* Outbound Ring Size Register */
+	u8     rsvd8[4];
+	__be32 oubring_job_rmvd; /* Outbound Ring Job Removed Register */
+	u8     rsvd9[4];
+	__be32 oubring_slot_full; /* Outbound Ring Slot Full Register */
+	u8     rsvd10[4];
+	__be32 oubring_prdcr_indx; /* Outbound Ring Producer Index */
+};
+
+/*
+ * Command Descriptor Block (CDB) for unicast move command.
+ * In RAID Engine terms, memcpy is done through move command
+ */
+struct fsl_re_move_cdb {
+	__be32 cdb32;
+};
+
+/* Data protection/integrity related fields */
+#define FSL_RE_DPI_APPS_MASK		0xC0000000
+#define FSL_RE_DPI_APPS_SHIFT		30
+#define FSL_RE_DPI_REF_MASK		0x30000000
+#define FSL_RE_DPI_REF_SHIFT		28
+#define FSL_RE_DPI_GUARD_MASK		0x0C000000
+#define FSL_RE_DPI_GUARD_SHIFT		26
+#define FSL_RE_DPI_ATTR_MASK		0x03000000
+#define FSL_RE_DPI_ATTR_SHIFT		24
+#define FSL_RE_DPI_META_MASK		0x0000FFFF
+
+struct fsl_re_dpi {
+	__be32 dpi32;
+	__be32 ref;
+};
+
+/*
+ * CDB for GenQ command. In RAID Engine terminology, XOR is
+ * done through this command
+ */
+struct fsl_re_xor_cdb {
+	__be32 cdb32;
+	u8 gfm[16];
+	struct fsl_re_dpi dpi_dest_spec;
+	struct fsl_re_dpi dpi_src_spec[16];
+};
+
+/* CDB for no-op command */
+struct fsl_re_noop_cdb {
+	__be32 cdb32;
+};
+
+/*
+ * CDB for GenQQ command. In RAID Engine terminology, P/Q is
+ * done through this command
+ */
+struct fsl_re_pq_cdb {
+	__be32 cdb32;
+	u8 gfm_q1[16];
+	u8 gfm_q2[16];
+	struct fsl_re_dpi dpi_dest_spec[2];
+	struct fsl_re_dpi dpi_src_spec[16];
+};
+
+/* Compound frame */
+#define FSL_RE_CF_ADDR_HIGH_MASK	0x000000FF
+#define FSL_RE_CF_EXT_MASK		0x80000000
+#define FSL_RE_CF_EXT_SHIFT		31
+#define FSL_RE_CF_FINAL_MASK		0x40000000
+#define FSL_RE_CF_FINAL_SHIFT		30
+#define FSL_RE_CF_LENGTH_MASK		0x000FFFFF
+#define FSL_RE_CF_BPID_MASK		0x00FF0000
+#define FSL_RE_CF_BPID_SHIFT		16
+#define FSL_RE_CF_OFFSET_MASK		0x00001FFF
+
+struct fsl_re_cmpnd_frame {
+	__be32 addr_high;
+	__be32 addr_low;
+	__be32 efrl32;
+	__be32 rbro32;
+};
+
+/* Frame descriptor */
+#define FSL_RE_HWDESC_LIODN_MASK	0x3F000000
+#define FSL_RE_HWDESC_LIODN_SHIFT	24
+#define FSL_RE_HWDESC_BPID_MASK		0x00FF0000
+#define FSL_RE_HWDESC_BPID_SHIFT	16
+#define FSL_RE_HWDESC_ELIODN_MASK	0x0000F000
+#define FSL_RE_HWDESC_ELIODN_SHIFT	12
+#define FSL_RE_HWDESC_FMT_SHIFT		29
+#define FSL_RE_HWDESC_FMT_MASK		(0x3 << FSL_RE_HWDESC_FMT_SHIFT)
+
+struct fsl_re_hw_desc {
+	__be32 lbea32;
+	__be32 addr_low;
+	__be32 fmt32;
+	__be32 status;
+};
+
+/* Raid Engine device private data */
+struct fsl_re_drv_private {
+	u8 total_chans;
+	struct dma_device dma_dev;
+	struct fsl_re_ctrl *re_regs;
+	struct fsl_re_chan *re_jrs[FSL_RE_MAX_CHANS];
+	struct dma_pool *cf_desc_pool;
+	struct dma_pool *hw_desc_pool;
+};
+
+/* Per job ring data structure */
+struct fsl_re_chan {
+	char name[16];
+	spinlock_t desc_lock; /* queue lock */
+	struct list_head ack_q;  /* wait to acked queue */
+	struct list_head active_q; /* already issued on hw, not completed */
+	struct list_head submit_q;
+	struct list_head free_q; /* alloc available queue */
+	struct device *dev;
+	struct fsl_re_drv_private *re_dev;
+	struct dma_chan chan;
+	struct fsl_re_chan_cfg *jrregs;
+	int irq;
+	struct tasklet_struct irqtask;
+	u32 alloc_count;
+
+	/* hw descriptor ring for inbound queue*/
+	dma_addr_t inb_phys_addr;
+	struct fsl_re_hw_desc *inb_ring_virt_addr;
+	u32 inb_count;
+
+	/* hw descriptor ring for outbound queue */
+	dma_addr_t oub_phys_addr;
+	struct fsl_re_hw_desc *oub_ring_virt_addr;
+	u32 oub_count;
+};
+
+/* Async transaction descriptor */
+struct fsl_re_desc {
+	struct dma_async_tx_descriptor async_tx;
+	struct list_head node;
+	struct fsl_re_hw_desc hwdesc;
+	struct fsl_re_chan *re_chan;
+
+	/* hwdesc will point to cf_addr */
+	void *cf_addr;
+	dma_addr_t cf_paddr;
+
+	void *cdb_addr;
+	dma_addr_t cdb_paddr;
+	int status;
+};