DMAENGINE: Support for ST-Ericssons DMA40 block v3

This is a straightforward driver for the ST-Ericsson DMA40 DMA
controller found in U8500, implemented akin to the existing
COH 901 318 driver.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Srinidh Kasagar <srinidhi.kasagar@stericsson.com>
Cc: STEricsson_nomadik_linux@list.st.com
Cc: Alessandro Rubini <rubini@unipv.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 354 insertions, 0 deletions

diff --git a/drivers/dma/ste_dma40_ll.h b/drivers/dma/ste_dma40_ll.h
new file mode 100644
index 000000000000..2029280cb332
--- /dev/null
+++ b/drivers/dma/ste_dma40_ll.h
@@ -0,0 +1,354 @@
+/*
+ * driver/dma/ste_dma40_ll.h
+ *
+ * Copyright (C) ST-Ericsson 2007-2010
+ * License terms: GNU General Public License (GPL) version 2
+ * Author: Per Friden <per.friden@stericsson.com>
+ * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
+ */
+#ifndef STE_DMA40_LL_H
+#define STE_DMA40_LL_H
+
+#define D40_DREG_PCBASE         0x400
+#define D40_DREG_PCDELTA        (8 * 4)
+#define D40_LLI_ALIGN           16 /* LLI alignment must be 16 bytes. */
+
+#define D40_TYPE_TO_GROUP(type) (type / 16)
+#define D40_TYPE_TO_EVENT(type) (type % 16)
+
+/* Most bits of the CFG register are the same in log as in phy mode */
+#define D40_SREG_CFG_MST_POS            15
+#define D40_SREG_CFG_TIM_POS            14
+#define D40_SREG_CFG_EIM_POS            13
+#define D40_SREG_CFG_LOG_INCR_POS       12
+#define D40_SREG_CFG_PHY_PEN_POS        12
+#define D40_SREG_CFG_PSIZE_POS          10
+#define D40_SREG_CFG_ESIZE_POS           8
+#define D40_SREG_CFG_PRI_POS             7
+#define D40_SREG_CFG_LBE_POS             6
+#define D40_SREG_CFG_LOG_GIM_POS         5
+#define D40_SREG_CFG_LOG_MFU_POS         4
+#define D40_SREG_CFG_PHY_TM_POS          4
+#define D40_SREG_CFG_PHY_EVTL_POS        0
+
+
+/* Standard channel parameters - basic mode (element register) */
+#define D40_SREG_ELEM_PHY_ECNT_POS      16
+#define D40_SREG_ELEM_PHY_EIDX_POS       0
+
+#define D40_SREG_ELEM_PHY_ECNT_MASK     (0xFFFF << D40_SREG_ELEM_PHY_ECNT_POS)
+
+/* Standard channel parameters - basic mode (Link register) */
+#define D40_SREG_LNK_PHY_TCP_POS        0
+#define D40_SREG_LNK_PHY_LMP_POS        1
+#define D40_SREG_LNK_PHY_PRE_POS        2
+/*
+ * Source  destination link address. Contains the
+ * 29-bit byte word aligned address of the reload area.
+ */
+#define D40_SREG_LNK_PHYS_LNK_MASK      0xFFFFFFF8UL
+
+/* Standard basic channel logical mode */
+
+/* Element register */
+#define D40_SREG_ELEM_LOG_ECNT_POS      16
+#define D40_SREG_ELEM_LOG_LIDX_POS       8
+#define D40_SREG_ELEM_LOG_LOS_POS        1
+#define D40_SREG_ELEM_LOG_TCP_POS        0
+
+#define D40_SREG_ELEM_LOG_LIDX_MASK     (0xFF << D40_SREG_ELEM_LOG_LIDX_POS)
+
+/* Link register */
+#define D40_DEACTIVATE_EVENTLINE        0x0
+#define D40_ACTIVATE_EVENTLINE          0x1
+#define D40_EVENTLINE_POS(i)            (2 * i)
+#define D40_EVENTLINE_MASK(i)           (0x3 << D40_EVENTLINE_POS(i))
+
+/* Standard basic channel logical params in memory */
+
+/* LCSP0 */
+#define D40_MEM_LCSP0_ECNT_POS          16
+#define D40_MEM_LCSP0_SPTR_POS           0
+
+#define D40_MEM_LCSP0_ECNT_MASK         (0xFFFF << D40_MEM_LCSP0_ECNT_POS)
+#define D40_MEM_LCSP0_SPTR_MASK         (0xFFFF << D40_MEM_LCSP0_SPTR_POS)
+
+/* LCSP1 */
+#define D40_MEM_LCSP1_SPTR_POS          16
+#define D40_MEM_LCSP1_SCFG_MST_POS      15
+#define D40_MEM_LCSP1_SCFG_TIM_POS      14
+#define D40_MEM_LCSP1_SCFG_EIM_POS      13
+#define D40_MEM_LCSP1_SCFG_INCR_POS     12
+#define D40_MEM_LCSP1_SCFG_PSIZE_POS    10
+#define D40_MEM_LCSP1_SCFG_ESIZE_POS     8
+#define D40_MEM_LCSP1_SLOS_POS           1
+#define D40_MEM_LCSP1_STCP_POS           0
+
+#define D40_MEM_LCSP1_SPTR_MASK         (0xFFFF << D40_MEM_LCSP1_SPTR_POS)
+#define D40_MEM_LCSP1_SCFG_TIM_MASK     (0x1 << D40_MEM_LCSP1_SCFG_TIM_POS)
+#define D40_MEM_LCSP1_SCFG_INCR_MASK    (0x1 << D40_MEM_LCSP1_SCFG_INCR_POS)
+#define D40_MEM_LCSP1_SCFG_PSIZE_MASK   (0x3 << D40_MEM_LCSP1_SCFG_PSIZE_POS)
+#define D40_MEM_LCSP1_SLOS_MASK         (0x7F << D40_MEM_LCSP1_SLOS_POS)
+#define D40_MEM_LCSP1_STCP_MASK         (0x1 << D40_MEM_LCSP1_STCP_POS)
+
+/* LCSP2 */
+#define D40_MEM_LCSP2_ECNT_POS          16
+
+#define D40_MEM_LCSP2_ECNT_MASK         (0xFFFF << D40_MEM_LCSP2_ECNT_POS)
+
+/* LCSP3 */
+#define D40_MEM_LCSP3_DCFG_MST_POS      15
+#define D40_MEM_LCSP3_DCFG_TIM_POS      14
+#define D40_MEM_LCSP3_DCFG_EIM_POS      13
+#define D40_MEM_LCSP3_DCFG_INCR_POS     12
+#define D40_MEM_LCSP3_DCFG_PSIZE_POS    10
+#define D40_MEM_LCSP3_DCFG_ESIZE_POS     8
+#define D40_MEM_LCSP3_DLOS_POS           1
+#define D40_MEM_LCSP3_DTCP_POS           0
+
+#define D40_MEM_LCSP3_DLOS_MASK         (0x7F << D40_MEM_LCSP3_DLOS_POS)
+#define D40_MEM_LCSP3_DTCP_MASK         (0x1 << D40_MEM_LCSP3_DTCP_POS)
+
+
+/* Standard channel parameter register offsets */
+#define D40_CHAN_REG_SSCFG      0x00
+#define D40_CHAN_REG_SSELT      0x04
+#define D40_CHAN_REG_SSPTR      0x08
+#define D40_CHAN_REG_SSLNK      0x0C
+#define D40_CHAN_REG_SDCFG      0x10
+#define D40_CHAN_REG_SDELT      0x14
+#define D40_CHAN_REG_SDPTR      0x18
+#define D40_CHAN_REG_SDLNK      0x1C
+
+/* DMA Register Offsets */
+#define D40_DREG_GCC            0x000
+#define D40_DREG_PRTYP          0x004
+#define D40_DREG_PRSME          0x008
+#define D40_DREG_PRSMO          0x00C
+#define D40_DREG_PRMSE          0x010
+#define D40_DREG_PRMSO          0x014
+#define D40_DREG_PRMOE          0x018
+#define D40_DREG_PRMOO          0x01C
+#define D40_DREG_LCPA           0x020
+#define D40_DREG_LCLA           0x024
+#define D40_DREG_ACTIVE         0x050
+#define D40_DREG_ACTIVO         0x054
+#define D40_DREG_FSEB1          0x058
+#define D40_DREG_FSEB2          0x05C
+#define D40_DREG_PCMIS          0x060
+#define D40_DREG_PCICR          0x064
+#define D40_DREG_PCTIS          0x068
+#define D40_DREG_PCEIS          0x06C
+#define D40_DREG_LCMIS0         0x080
+#define D40_DREG_LCMIS1         0x084
+#define D40_DREG_LCMIS2         0x088
+#define D40_DREG_LCMIS3         0x08C
+#define D40_DREG_LCICR0         0x090
+#define D40_DREG_LCICR1         0x094
+#define D40_DREG_LCICR2         0x098
+#define D40_DREG_LCICR3         0x09C
+#define D40_DREG_LCTIS0         0x0A0
+#define D40_DREG_LCTIS1         0x0A4
+#define D40_DREG_LCTIS2         0x0A8
+#define D40_DREG_LCTIS3         0x0AC
+#define D40_DREG_LCEIS0         0x0B0
+#define D40_DREG_LCEIS1         0x0B4
+#define D40_DREG_LCEIS2         0x0B8
+#define D40_DREG_LCEIS3         0x0BC
+#define D40_DREG_STFU           0xFC8
+#define D40_DREG_ICFG           0xFCC
+#define D40_DREG_PERIPHID0      0xFE0
+#define D40_DREG_PERIPHID1      0xFE4
+#define D40_DREG_PERIPHID2      0xFE8
+#define D40_DREG_PERIPHID3      0xFEC
+#define D40_DREG_CELLID0        0xFF0
+#define D40_DREG_CELLID1        0xFF4
+#define D40_DREG_CELLID2        0xFF8
+#define D40_DREG_CELLID3        0xFFC
+
+/* LLI related structures */
+
+/**
+ * struct d40_phy_lli - The basic configration register for each physical
+ * channel.
+ *
+ * @reg_cfg: The configuration register.
+ * @reg_elt: The element register.
+ * @reg_ptr: The pointer register.
+ * @reg_lnk: The link register.
+ *
+ * These registers are set up for both physical and logical transfers
+ * Note that the bit in each register means differently in logical and
+ * physical(standard) mode.
+ *
+ * This struct must be 16 bytes aligned, and only contain physical registers
+ * since it will be directly accessed by the DMA.
+ */
+struct d40_phy_lli {
+        u32 reg_cfg;
+        u32 reg_elt;
+        u32 reg_ptr;
+        u32 reg_lnk;
+};
+
+/**
+ * struct d40_phy_lli_bidir - struct for a transfer.
+ *
+ * @src: Register settings for src channel.
+ * @dst: Register settings for dst channel.
+ * @dst_addr: Physical destination address.
+ * @src_addr: Physical source address.
+ *
+ * All DMA transfers have a source and a destination.
+ */
+
+struct d40_phy_lli_bidir {
+        struct d40_phy_lli      *src;
+        struct d40_phy_lli      *dst;
+        dma_addr_t               dst_addr;
+        dma_addr_t               src_addr;
+};
+
+
+/**
+ * struct d40_log_lli - logical lli configuration
+ *
+ * @lcsp02: Either maps to register lcsp0 if src or lcsp2 if dst.
+ * @lcsp13: Either maps to register lcsp1 if src or lcsp3 if dst.
+ *
+ * This struct must be 8 bytes aligned since it will be accessed directy by
+ * the DMA. Never add any none hw mapped registers to this struct.
+ */
+
+struct d40_log_lli {
+        u32 lcsp02;
+        u32 lcsp13;
+};
+
+/**
+ * struct d40_log_lli_bidir - For both src and dst
+ *
+ * @src: pointer to src lli configuration.
+ * @dst: pointer to dst lli configuration.
+ *
+ * You always have a src and a dst when doing DMA transfers.
+ */
+
+struct d40_log_lli_bidir {
+        struct d40_log_lli *src;
+        struct d40_log_lli *dst;
+};
+
+/**
+ * struct d40_log_lli_full - LCPA layout
+ *
+ * @lcsp0: Logical Channel Standard Param 0 - Src.
+ * @lcsp1: Logical Channel Standard Param 1 - Src.
+ * @lcsp2: Logical Channel Standard Param 2 - Dst.
+ * @lcsp3: Logical Channel Standard Param 3 - Dst.
+ *
+ * This struct maps to LCPA physical memory layout. Must map to
+ * the hw.
+ */
+struct d40_log_lli_full {
+        u32 lcsp0;
+        u32 lcsp1;
+        u32 lcsp2;
+        u32 lcsp3;
+};
+
+/**
+ * struct d40_def_lcsp - Default LCSP1 and LCSP3 settings
+ *
+ * @lcsp3: The default configuration for dst.
+ * @lcsp1: The default configuration for src.
+ */
+struct d40_def_lcsp {
+        u32 lcsp3;
+        u32 lcsp1;
+};
+
+/**
+ * struct d40_lcla_elem - Info for one LCA element.
+ *
+ * @src_id: logical channel src id
+ * @dst_id: logical channel dst id
+ * @src: LCPA formated src parameters
+ * @dst: LCPA formated dst parameters
+ *
+ */
+struct d40_lcla_elem {
+        int                     src_id;
+        int                     dst_id;
+        struct d40_log_lli     *src;
+        struct d40_log_lli     *dst;
+};
+
+/* Physical channels */
+
+void d40_phy_cfg(struct stedma40_chan_cfg *cfg,
+                 u32 *src_cfg, u32 *dst_cfg, bool is_log);
+
+void d40_log_cfg(struct stedma40_chan_cfg *cfg,
+                 u32 *lcsp1, u32 *lcsp2);
+
+int d40_phy_sg_to_lli(struct scatterlist *sg,
+                      int sg_len,
+                      dma_addr_t target,
+                      struct d40_phy_lli *lli,
+                      dma_addr_t lli_phys,
+                      u32 reg_cfg,
+                      u32 data_width,
+                      int psize,
+                      bool term_int);
+
+int d40_phy_fill_lli(struct d40_phy_lli *lli,
+                     dma_addr_t data,
+                     u32 data_size,
+                     int psize,
+                     dma_addr_t next_lli,
+                     u32 reg_cfg,
+                     bool term_int,
+                     u32 data_width,
+                     bool is_device);
+
+void d40_phy_lli_write(void __iomem *virtbase,
+                       u32 phy_chan_num,
+                       struct d40_phy_lli *lli_dst,
+                       struct d40_phy_lli *lli_src);
+
+/* Logical channels */
+
+void d40_log_fill_lli(struct d40_log_lli *lli,
+                      dma_addr_t data, u32 data_size,
+                      u32 lli_next_off, u32 reg_cfg,
+                      u32 data_width,
+                      bool term_int, bool addr_inc);
+
+int d40_log_sg_to_dev(struct d40_lcla_elem *lcla,
+                      struct scatterlist *sg,
+                      int sg_len,
+                      struct d40_log_lli_bidir *lli,
+                      struct d40_def_lcsp *lcsp,
+                      u32 src_data_width,
+                      u32 dst_data_width,
+                      enum dma_data_direction direction,
+                      bool term_int, dma_addr_t dev_addr, int max_len,
+                      int llis_per_log);
+
+void d40_log_lli_write(struct d40_log_lli_full *lcpa,
+                       struct d40_log_lli *lcla_src,
+                       struct d40_log_lli *lcla_dst,
+                       struct d40_log_lli *lli_dst,
+                       struct d40_log_lli *lli_src,
+                       int llis_per_log);
+
+int d40_log_sg_to_lli(int lcla_id,
+                      struct scatterlist *sg,
+                      int sg_len,
+                      struct d40_log_lli *lli_sg,
+                      u32 lcsp13, /* src or dst*/
+                      u32 data_width,
+                      bool term_int, int max_len, int llis_per_log);
+
+#endif /* STE_DMA40_LLI_H */