Add COH 901 318 DMA block driver v5

This patch adds support for the ST-Ericsson COH 901 318 DMA block,
found in the U300 series platforms. It registers a DMA slave for
device I/O and also a memcpy slave for memcpy.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 281 insertions, 0 deletions

diff --git a/arch/arm/mach-u300/include/mach/coh901318.h b/arch/arm/mach-u300/include/mach/coh901318.h
new file mode 100644
index 000000000000..f4cfee9c7d28
--- /dev/null
+++ b/arch/arm/mach-u300/include/mach/coh901318.h
@@ -0,0 +1,281 @@
+/*
+ *
+ * include/linux/coh901318.h
+ *
+ *
+ * Copyright (C) 2007-2009 ST-Ericsson
+ * License terms: GNU General Public License (GPL) version 2
+ * DMA driver for COH 901 318
+ * Author: Per Friden <per.friden@stericsson.com>
+ */
+
+#ifndef COH901318_H
+#define COH901318_H
+
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+
+#define MAX_DMA_PACKET_SIZE_SHIFT 11
+#define MAX_DMA_PACKET_SIZE (1 << MAX_DMA_PACKET_SIZE_SHIFT)
+
+/**
+ * struct coh901318_lli - linked list item for DMAC
+ * @control: control settings for DMAC
+ * @src_addr: transfer source address
+ * @dst_addr: transfer destination address
+ * @link_addr:  physical address to next lli
+ * @virt_link_addr: virtual addres of next lli (only used by pool_free)
+ * @phy_this: physical address of current lli (only used by pool_free)
+ */
+struct coh901318_lli {
+        u32 control;
+        dma_addr_t src_addr;
+        dma_addr_t dst_addr;
+        dma_addr_t link_addr;
+
+        void *virt_link_addr;
+        dma_addr_t phy_this;
+};
+/**
+ * struct coh901318_params - parameters for DMAC configuration
+ * @config: DMA config register
+ * @ctrl_lli_last: DMA control register for the last lli in the list
+ * @ctrl_lli: DMA control register for an lli
+ * @ctrl_lli_chained: DMA control register for a chained lli
+ */
+struct coh901318_params {
+        u32 config;
+        u32 ctrl_lli_last;
+        u32 ctrl_lli;
+        u32 ctrl_lli_chained;
+};
+/**
+ * struct coh_dma_channel - dma channel base
+ * @name: ascii name of dma channel
+ * @number: channel id number
+ * @desc_nbr_max: number of preallocated descriptortors
+ * @priority_high: prio of channel, 0 low otherwise high.
+ * @param: configuration parameters
+ * @dev_addr: physical address of periphal connected to channel
+ */
+struct coh_dma_channel {
+        const char name[32];
+        const int number;
+        const int desc_nbr_max;
+        const int priority_high;
+        const struct coh901318_params param;
+        const dma_addr_t dev_addr;
+};
+
+/**
+ * dma_access_memory_state_t - register dma for memory access
+ *
+ * @dev: The dma device
+ * @active:  1 means dma intends to access memory
+ *           0 means dma wont access memory
+ */
+typedef void (*dma_access_memory_state_t)(struct device *dev,
+                                          bool active);
+
+/**
+ * struct powersave - DMA power save structure
+ * @lock: lock protecting data in this struct
+ * @started_channels: bit mask indicating active dma channels
+ */
+struct powersave {
+        spinlock_t lock;
+        u64 started_channels;
+};
+/**
+ * struct coh901318_platform - platform arch structure
+ * @chans_slave: specifying dma slave channels
+ * @chans_memcpy: specifying dma memcpy channels
+ * @access_memory_state: requesting DMA memeory access (on / off)
+ * @chan_conf: dma channel configurations
+ * @max_channels: max number of dma chanenls
+ */
+struct coh901318_platform {
+        const int *chans_slave;
+        const int *chans_memcpy;
+        const dma_access_memory_state_t access_memory_state;
+        const struct coh_dma_channel *chan_conf;
+        const int max_channels;
+};
+
+/**
+ * coh901318_get_bytes_left() - Get number of bytes left on a current transfer
+ * @chan: dma channel handle
+ * return number of bytes left, or negative on error
+ */
+u32 coh901318_get_bytes_left(struct dma_chan *chan);
+
+/**
+ * coh901318_stop() - Stops dma transfer
+ * @chan: dma channel handle
+ * return 0 on success otherwise negative value
+ */
+void coh901318_stop(struct dma_chan *chan);
+
+/**
+ * coh901318_continue() - Resumes a stopped dma transfer
+ * @chan: dma channel handle
+ * return 0 on success otherwise negative value
+ */
+void coh901318_continue(struct dma_chan *chan);
+
+/**
+ * coh901318_filter_id() - DMA channel filter function
+ * @chan: dma channel handle
+ * @chan_id: id of dma channel to be filter out
+ *
+ * In dma_request_channel() it specifies what channel id to be requested
+ */
+bool coh901318_filter_id(struct dma_chan *chan, void *chan_id);
+
+/*
+ * DMA Controller - this access the static mappings of the coh901318 dma.
+ *
+ */
+
+#define COH901318_MOD32_MASK                                    (0x1F)
+#define COH901318_WORD_MASK                                     (0xFFFFFFFF)
+/* INT_STATUS - Interrupt Status Registers 32bit (R/-) */
+#define COH901318_INT_STATUS1                                   (0x0000)
+#define COH901318_INT_STATUS2                                   (0x0004)
+/* TC_INT_STATUS - Terminal Count Interrupt Status Registers 32bit (R/-) */
+#define COH901318_TC_INT_STATUS1                                (0x0008)
+#define COH901318_TC_INT_STATUS2                                (0x000C)
+/* TC_INT_CLEAR - Terminal Count Interrupt Clear Registers 32bit (-/W) */
+#define COH901318_TC_INT_CLEAR1                                 (0x0010)
+#define COH901318_TC_INT_CLEAR2                                 (0x0014)
+/* RAW_TC_INT_STATUS - Raw Term Count Interrupt Status Registers 32bit (R/-) */
+#define COH901318_RAW_TC_INT_STATUS1                            (0x0018)
+#define COH901318_RAW_TC_INT_STATUS2                            (0x001C)
+/* BE_INT_STATUS - Bus Error Interrupt Status Registers 32bit (R/-) */
+#define COH901318_BE_INT_STATUS1                                (0x0020)
+#define COH901318_BE_INT_STATUS2                                (0x0024)
+/* BE_INT_CLEAR - Bus Error Interrupt Clear Registers 32bit (-/W) */
+#define COH901318_BE_INT_CLEAR1                                 (0x0028)
+#define COH901318_BE_INT_CLEAR2                                 (0x002C)
+/* RAW_BE_INT_STATUS - Raw Term Count Interrupt Status Registers 32bit (R/-) */
+#define COH901318_RAW_BE_INT_STATUS1                            (0x0030)
+#define COH901318_RAW_BE_INT_STATUS2                            (0x0034)
+
+/*
+ * CX_CFG - Channel Configuration Registers 32bit (R/W)
+ */
+#define COH901318_CX_CFG                                        (0x0100)
+#define COH901318_CX_CFG_SPACING                                (0x04)
+/* Channel enable activates tha dma job */
+#define COH901318_CX_CFG_CH_ENABLE                              (0x00000001)
+#define COH901318_CX_CFG_CH_DISABLE                             (0x00000000)
+/* Request Mode */
+#define COH901318_CX_CFG_RM_MASK                                (0x00000006)
+#define COH901318_CX_CFG_RM_MEMORY_TO_MEMORY                    (0x0 << 1)
+#define COH901318_CX_CFG_RM_PRIMARY_TO_MEMORY                   (0x1 << 1)
+#define COH901318_CX_CFG_RM_MEMORY_TO_PRIMARY                   (0x1 << 1)
+#define COH901318_CX_CFG_RM_PRIMARY_TO_SECONDARY                (0x3 << 1)
+#define COH901318_CX_CFG_RM_SECONDARY_TO_PRIMARY                (0x3 << 1)
+/* Linked channel request field. RM must == 11 */
+#define COH901318_CX_CFG_LCRF_SHIFT                             3
+#define COH901318_CX_CFG_LCRF_MASK                              (0x000001F8)
+#define COH901318_CX_CFG_LCR_DISABLE                            (0x00000000)
+/* Terminal Counter Interrupt Request Mask */
+#define COH901318_CX_CFG_TC_IRQ_ENABLE                          (0x00000200)
+#define COH901318_CX_CFG_TC_IRQ_DISABLE                         (0x00000000)
+/* Bus Error interrupt Mask */
+#define COH901318_CX_CFG_BE_IRQ_ENABLE                          (0x00000400)
+#define COH901318_CX_CFG_BE_IRQ_DISABLE                         (0x00000000)
+
+/*
+ * CX_STAT - Channel Status Registers 32bit (R/-)
+ */
+#define COH901318_CX_STAT                                       (0x0200)
+#define COH901318_CX_STAT_SPACING                               (0x04)
+#define COH901318_CX_STAT_RBE_IRQ_IND                           (0x00000008)
+#define COH901318_CX_STAT_RTC_IRQ_IND                           (0x00000004)
+#define COH901318_CX_STAT_ACTIVE                                (0x00000002)
+#define COH901318_CX_STAT_ENABLED                               (0x00000001)
+
+/*
+ * CX_CTRL - Channel Control Registers 32bit (R/W)
+ */
+#define COH901318_CX_CTRL                                       (0x0400)
+#define COH901318_CX_CTRL_SPACING                               (0x10)
+/* Transfer Count Enable */
+#define COH901318_CX_CTRL_TC_ENABLE                             (0x00001000)
+#define COH901318_CX_CTRL_TC_DISABLE                            (0x00000000)
+/* Transfer Count Value 0 - 4095 */
+#define COH901318_CX_CTRL_TC_VALUE_MASK                         (0x00000FFF)
+/* Burst count */
+#define COH901318_CX_CTRL_BURST_COUNT_MASK                      (0x0000E000)
+#define COH901318_CX_CTRL_BURST_COUNT_64_BYTES                  (0x7 << 13)
+#define COH901318_CX_CTRL_BURST_COUNT_48_BYTES                  (0x6 << 13)
+#define COH901318_CX_CTRL_BURST_COUNT_32_BYTES                  (0x5 << 13)
+#define COH901318_CX_CTRL_BURST_COUNT_16_BYTES                  (0x4 << 13)
+#define COH901318_CX_CTRL_BURST_COUNT_8_BYTES                   (0x3 << 13)
+#define COH901318_CX_CTRL_BURST_COUNT_4_BYTES                   (0x2 << 13)
+#define COH901318_CX_CTRL_BURST_COUNT_2_BYTES                   (0x1 << 13)
+#define COH901318_CX_CTRL_BURST_COUNT_1_BYTE                    (0x0 << 13)
+/* Source bus size  */
+#define COH901318_CX_CTRL_SRC_BUS_SIZE_MASK                     (0x00030000)
+#define COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS                  (0x2 << 16)
+#define COH901318_CX_CTRL_SRC_BUS_SIZE_16_BITS                  (0x1 << 16)
+#define COH901318_CX_CTRL_SRC_BUS_SIZE_8_BITS                   (0x0 << 16)
+/* Source address increment */
+#define COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE                   (0x00040000)
+#define COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE                  (0x00000000)
+/* Destination Bus Size */
+#define COH901318_CX_CTRL_DST_BUS_SIZE_MASK                     (0x00180000)
+#define COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS                  (0x2 << 19)
+#define COH901318_CX_CTRL_DST_BUS_SIZE_16_BITS                  (0x1 << 19)
+#define COH901318_CX_CTRL_DST_BUS_SIZE_8_BITS                   (0x0 << 19)
+/* Destination address increment */
+#define COH901318_CX_CTRL_DST_ADDR_INC_ENABLE                   (0x00200000)
+#define COH901318_CX_CTRL_DST_ADDR_INC_DISABLE                  (0x00000000)
+/* Master Mode (Master2 is only connected to MSL) */
+#define COH901318_CX_CTRL_MASTER_MODE_MASK                      (0x00C00000)
+#define COH901318_CX_CTRL_MASTER_MODE_M2R_M1W                   (0x3 << 22)
+#define COH901318_CX_CTRL_MASTER_MODE_M1R_M2W                   (0x2 << 22)
+#define COH901318_CX_CTRL_MASTER_MODE_M2RW                      (0x1 << 22)
+#define COH901318_CX_CTRL_MASTER_MODE_M1RW                      (0x0 << 22)
+/* Terminal Count flag to PER enable */
+#define COH901318_CX_CTRL_TCP_ENABLE                            (0x01000000)
+#define COH901318_CX_CTRL_TCP_DISABLE                           (0x00000000)
+/* Terminal Count flags to CPU enable */
+#define COH901318_CX_CTRL_TC_IRQ_ENABLE                         (0x02000000)
+#define COH901318_CX_CTRL_TC_IRQ_DISABLE                        (0x00000000)
+/* Hand shake to peripheral */
+#define COH901318_CX_CTRL_HSP_ENABLE                            (0x04000000)
+#define COH901318_CX_CTRL_HSP_DISABLE                           (0x00000000)
+#define COH901318_CX_CTRL_HSS_ENABLE                            (0x08000000)
+#define COH901318_CX_CTRL_HSS_DISABLE                           (0x00000000)
+/* DMA mode */
+#define COH901318_CX_CTRL_DDMA_MASK                             (0x30000000)
+#define COH901318_CX_CTRL_DDMA_LEGACY                           (0x0 << 28)
+#define COH901318_CX_CTRL_DDMA_DEMAND_DMA1                      (0x1 << 28)
+#define COH901318_CX_CTRL_DDMA_DEMAND_DMA2                      (0x2 << 28)
+/* Primary Request Data Destination */
+#define COH901318_CX_CTRL_PRDD_MASK                             (0x40000000)
+#define COH901318_CX_CTRL_PRDD_DEST                             (0x1 << 30)
+#define COH901318_CX_CTRL_PRDD_SOURCE                           (0x0 << 30)
+
+/*
+ * CX_SRC_ADDR - Channel Source Address Registers 32bit (R/W)
+ */
+#define COH901318_CX_SRC_ADDR                                   (0x0404)
+#define COH901318_CX_SRC_ADDR_SPACING                           (0x10)
+
+/*
+ * CX_DST_ADDR - Channel Destination Address Registers 32bit R/W
+ */
+#define COH901318_CX_DST_ADDR                                   (0x0408)
+#define COH901318_CX_DST_ADDR_SPACING                           (0x10)
+
+/*
+ * CX_LNK_ADDR - Channel Link Address Registers 32bit (R/W)
+ */
+#define COH901318_CX_LNK_ADDR                                   (0x040C)
+#define COH901318_CX_LNK_ADDR_SPACING                           (0x10)
+#define COH901318_CX_LNK_LINK_IMMEDIATE                         (0x00000001)
+#endif /* COH901318_H */