1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright 2013-2014 Freescale Semiconductor, Inc. 4 * Copyright 2018 Angelo Dureghello <angelo@sysam.it> 5 */ 6 #ifndef _FSL_EDMA_COMMON_H_ 7 #define _FSL_EDMA_COMMON_H_ 8 9 #include <linux/dma-direction.h> 10 #include <linux/platform_device.h> 11 #include "virt-dma.h" 12 13 #define EDMA_CR_EDBG BIT(1) 14 #define EDMA_CR_ERCA BIT(2) 15 #define EDMA_CR_ERGA BIT(3) 16 #define EDMA_CR_HOE BIT(4) 17 #define EDMA_CR_HALT BIT(5) 18 #define EDMA_CR_CLM BIT(6) 19 #define EDMA_CR_EMLM BIT(7) 20 #define EDMA_CR_ECX BIT(16) 21 #define EDMA_CR_CX BIT(17) 22 23 #define EDMA_SEEI_SEEI(x) ((x) & GENMASK(4, 0)) 24 #define EDMA_CEEI_CEEI(x) ((x) & GENMASK(4, 0)) 25 #define EDMA_CINT_CINT(x) ((x) & GENMASK(4, 0)) 26 #define EDMA_CERR_CERR(x) ((x) & GENMASK(4, 0)) 27 28 #define EDMA_TCD_ATTR_DSIZE(x) (((x) & GENMASK(2, 0))) 29 #define EDMA_TCD_ATTR_DMOD(x) (((x) & GENMASK(4, 0)) << 3) 30 #define EDMA_TCD_ATTR_SSIZE(x) (((x) & GENMASK(2, 0)) << 8) 31 #define EDMA_TCD_ATTR_SMOD(x) (((x) & GENMASK(4, 0)) << 11) 32 #define EDMA_TCD_ATTR_DSIZE_8BIT 0 33 #define EDMA_TCD_ATTR_DSIZE_16BIT BIT(0) 34 #define EDMA_TCD_ATTR_DSIZE_32BIT BIT(1) 35 #define EDMA_TCD_ATTR_DSIZE_64BIT (BIT(0) | BIT(1)) 36 #define EDMA_TCD_ATTR_DSIZE_32BYTE (BIT(2) | BIT(0)) 37 #define EDMA_TCD_ATTR_SSIZE_8BIT 0 38 #define EDMA_TCD_ATTR_SSIZE_16BIT (EDMA_TCD_ATTR_DSIZE_16BIT << 8) 39 #define EDMA_TCD_ATTR_SSIZE_32BIT (EDMA_TCD_ATTR_DSIZE_32BIT << 8) 40 #define EDMA_TCD_ATTR_SSIZE_64BIT (EDMA_TCD_ATTR_DSIZE_64BIT << 8) 41 #define EDMA_TCD_ATTR_SSIZE_32BYTE (EDMA_TCD_ATTR_DSIZE_32BYTE << 8) 42 43 #define EDMA_TCD_CITER_CITER(x) ((x) & GENMASK(14, 0)) 44 #define EDMA_TCD_BITER_BITER(x) ((x) & GENMASK(14, 0)) 45 46 #define EDMA_TCD_CSR_START BIT(0) 47 #define EDMA_TCD_CSR_INT_MAJOR BIT(1) 48 #define EDMA_TCD_CSR_INT_HALF BIT(2) 49 #define EDMA_TCD_CSR_D_REQ BIT(3) 50 #define EDMA_TCD_CSR_E_SG BIT(4) 51 #define EDMA_TCD_CSR_E_LINK BIT(5) 52 #define EDMA_TCD_CSR_ACTIVE BIT(6) 53 #define EDMA_TCD_CSR_DONE BIT(7) 54 55 #define EDMAMUX_CHCFG_DIS 0x0 56 #define EDMAMUX_CHCFG_ENBL 0x80 57 #define EDMAMUX_CHCFG_SOURCE(n) ((n) & 0x3F) 58 59 #define DMAMUX_NR 2 60 61 #define FSL_EDMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ 62 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ 63 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ 64 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) 65 enum fsl_edma_pm_state { 66 RUNNING = 0, 67 SUSPENDED, 68 }; 69 70 struct fsl_edma_hw_tcd { 71 __le32 saddr; 72 __le16 soff; 73 __le16 attr; 74 __le32 nbytes; 75 __le32 slast; 76 __le32 daddr; 77 __le16 doff; 78 __le16 citer; 79 __le32 dlast_sga; 80 __le16 csr; 81 __le16 biter; 82 }; 83 84 /* 85 * These are iomem pointers, for both v32 and v64. 86 */ 87 struct edma_regs { 88 void __iomem *cr; 89 void __iomem *es; 90 void __iomem *erqh; 91 void __iomem *erql; /* aka erq on v32 */ 92 void __iomem *eeih; 93 void __iomem *eeil; /* aka eei on v32 */ 94 void __iomem *seei; 95 void __iomem *ceei; 96 void __iomem *serq; 97 void __iomem *cerq; 98 void __iomem *cint; 99 void __iomem *cerr; 100 void __iomem *ssrt; 101 void __iomem *cdne; 102 void __iomem *inth; 103 void __iomem *intl; 104 void __iomem *errh; 105 void __iomem *errl; 106 struct fsl_edma_hw_tcd __iomem *tcd; 107 }; 108 109 struct fsl_edma_sw_tcd { 110 dma_addr_t ptcd; 111 struct fsl_edma_hw_tcd *vtcd; 112 }; 113 114 struct fsl_edma_chan { 115 struct virt_dma_chan vchan; 116 enum dma_status status; 117 enum fsl_edma_pm_state pm_state; 118 bool idle; 119 u32 slave_id; 120 struct fsl_edma_engine *edma; 121 struct fsl_edma_desc *edesc; 122 struct dma_slave_config cfg; 123 u32 attr; 124 bool is_sw; 125 struct dma_pool *tcd_pool; 126 dma_addr_t dma_dev_addr; 127 u32 dma_dev_size; 128 enum dma_data_direction dma_dir; 129 char chan_name[16]; 130 }; 131 132 struct fsl_edma_desc { 133 struct virt_dma_desc vdesc; 134 struct fsl_edma_chan *echan; 135 bool iscyclic; 136 enum dma_transfer_direction dirn; 137 unsigned int n_tcds; 138 struct fsl_edma_sw_tcd tcd[]; 139 }; 140 141 enum edma_version { 142 v1, /* 32ch, Vybrid, mpc57x, etc */ 143 v2, /* 64ch Coldfire */ 144 v3, /* 32ch, i.mx7ulp */ 145 }; 146 147 struct fsl_edma_drvdata { 148 enum edma_version version; 149 u32 dmamuxs; 150 bool has_dmaclk; 151 bool mux_swap; 152 int (*setup_irq)(struct platform_device *pdev, 153 struct fsl_edma_engine *fsl_edma); 154 }; 155 156 struct fsl_edma_engine { 157 struct dma_device dma_dev; 158 void __iomem *membase; 159 void __iomem *muxbase[DMAMUX_NR]; 160 struct clk *muxclk[DMAMUX_NR]; 161 struct clk *dmaclk; 162 struct mutex fsl_edma_mutex; 163 const struct fsl_edma_drvdata *drvdata; 164 u32 n_chans; 165 int txirq; 166 int errirq; 167 bool big_endian; 168 struct edma_regs regs; 169 struct fsl_edma_chan chans[]; 170 }; 171 172 /* 173 * R/W functions for big- or little-endian registers: 174 * The eDMA controller's endian is independent of the CPU core's endian. 175 * For the big-endian IP module, the offset for 8-bit or 16-bit registers 176 * should also be swapped opposite to that in little-endian IP. 177 */ 178 static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr) 179 { 180 if (edma->big_endian) 181 return ioread32be(addr); 182 else 183 return ioread32(addr); 184 } 185 186 static inline void edma_writeb(struct fsl_edma_engine *edma, 187 u8 val, void __iomem *addr) 188 { 189 /* swap the reg offset for these in big-endian mode */ 190 if (edma->big_endian) 191 iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3)); 192 else 193 iowrite8(val, addr); 194 } 195 196 static inline void edma_writew(struct fsl_edma_engine *edma, 197 u16 val, void __iomem *addr) 198 { 199 /* swap the reg offset for these in big-endian mode */ 200 if (edma->big_endian) 201 iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2)); 202 else 203 iowrite16(val, addr); 204 } 205 206 static inline void edma_writel(struct fsl_edma_engine *edma, 207 u32 val, void __iomem *addr) 208 { 209 if (edma->big_endian) 210 iowrite32be(val, addr); 211 else 212 iowrite32(val, addr); 213 } 214 215 static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan) 216 { 217 return container_of(chan, struct fsl_edma_chan, vchan.chan); 218 } 219 220 static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd) 221 { 222 return container_of(vd, struct fsl_edma_desc, vdesc); 223 } 224 225 void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan); 226 void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan, 227 unsigned int slot, bool enable); 228 void fsl_edma_free_desc(struct virt_dma_desc *vdesc); 229 int fsl_edma_terminate_all(struct dma_chan *chan); 230 int fsl_edma_pause(struct dma_chan *chan); 231 int fsl_edma_resume(struct dma_chan *chan); 232 int fsl_edma_slave_config(struct dma_chan *chan, 233 struct dma_slave_config *cfg); 234 enum dma_status fsl_edma_tx_status(struct dma_chan *chan, 235 dma_cookie_t cookie, struct dma_tx_state *txstate); 236 struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic( 237 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, 238 size_t period_len, enum dma_transfer_direction direction, 239 unsigned long flags); 240 struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( 241 struct dma_chan *chan, struct scatterlist *sgl, 242 unsigned int sg_len, enum dma_transfer_direction direction, 243 unsigned long flags, void *context); 244 struct dma_async_tx_descriptor *fsl_edma_prep_memcpy( 245 struct dma_chan *chan, dma_addr_t dma_dst, dma_addr_t dma_src, 246 size_t len, unsigned long flags); 247 void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan); 248 void fsl_edma_issue_pending(struct dma_chan *chan); 249 int fsl_edma_alloc_chan_resources(struct dma_chan *chan); 250 void fsl_edma_free_chan_resources(struct dma_chan *chan); 251 void fsl_edma_cleanup_vchan(struct dma_device *dmadev); 252 void fsl_edma_setup_regs(struct fsl_edma_engine *edma); 253 254 #endif /* _FSL_EDMA_COMMON_H_ */ 255