1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) STMicroelectronics 2018 - All Rights Reserved 4 * Author: Ludovic.barre@st.com for STMicroelectronics. 5 */ 6 #include <linux/delay.h> 7 #include <linux/dma-mapping.h> 8 #include <linux/mmc/host.h> 9 #include <linux/mmc/card.h> 10 #include <linux/reset.h> 11 #include <linux/scatterlist.h> 12 #include "mmci.h" 13 14 #define SDMMC_LLI_BUF_LEN PAGE_SIZE 15 #define SDMMC_IDMA_BURST BIT(MMCI_STM32_IDMABNDT_SHIFT) 16 17 struct sdmmc_lli_desc { 18 u32 idmalar; 19 u32 idmabase; 20 u32 idmasize; 21 }; 22 23 struct sdmmc_priv { 24 dma_addr_t sg_dma; 25 void *sg_cpu; 26 }; 27 28 int sdmmc_idma_validate_data(struct mmci_host *host, 29 struct mmc_data *data) 30 { 31 struct scatterlist *sg; 32 int i; 33 34 /* 35 * idma has constraints on idmabase & idmasize for each element 36 * excepted the last element which has no constraint on idmasize 37 */ 38 for_each_sg(data->sg, sg, data->sg_len - 1, i) { 39 if (!IS_ALIGNED(sg_dma_address(data->sg), sizeof(u32)) || 40 !IS_ALIGNED(sg_dma_len(data->sg), SDMMC_IDMA_BURST)) { 41 dev_err(mmc_dev(host->mmc), 42 "unaligned scatterlist: ofst:%x length:%d\n", 43 data->sg->offset, data->sg->length); 44 return -EINVAL; 45 } 46 } 47 48 if (!IS_ALIGNED(sg_dma_address(data->sg), sizeof(u32))) { 49 dev_err(mmc_dev(host->mmc), 50 "unaligned last scatterlist: ofst:%x length:%d\n", 51 data->sg->offset, data->sg->length); 52 return -EINVAL; 53 } 54 55 return 0; 56 } 57 58 static int _sdmmc_idma_prep_data(struct mmci_host *host, 59 struct mmc_data *data) 60 { 61 int n_elem; 62 63 n_elem = dma_map_sg(mmc_dev(host->mmc), 64 data->sg, 65 data->sg_len, 66 mmc_get_dma_dir(data)); 67 68 if (!n_elem) { 69 dev_err(mmc_dev(host->mmc), "dma_map_sg failed\n"); 70 return -EINVAL; 71 } 72 73 return 0; 74 } 75 76 static int sdmmc_idma_prep_data(struct mmci_host *host, 77 struct mmc_data *data, bool next) 78 { 79 /* Check if job is already prepared. */ 80 if (!next && data->host_cookie == host->next_cookie) 81 return 0; 82 83 return _sdmmc_idma_prep_data(host, data); 84 } 85 86 static void sdmmc_idma_unprep_data(struct mmci_host *host, 87 struct mmc_data *data, int err) 88 { 89 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, 90 mmc_get_dma_dir(data)); 91 } 92 93 static int sdmmc_idma_setup(struct mmci_host *host) 94 { 95 struct sdmmc_priv *idma; 96 97 idma = devm_kzalloc(mmc_dev(host->mmc), sizeof(*idma), GFP_KERNEL); 98 if (!idma) 99 return -ENOMEM; 100 101 host->dma_priv = idma; 102 103 if (host->variant->dma_lli) { 104 idma->sg_cpu = dmam_alloc_coherent(mmc_dev(host->mmc), 105 SDMMC_LLI_BUF_LEN, 106 &idma->sg_dma, GFP_KERNEL); 107 if (!idma->sg_cpu) { 108 dev_err(mmc_dev(host->mmc), 109 "Failed to alloc IDMA descriptor\n"); 110 return -ENOMEM; 111 } 112 host->mmc->max_segs = SDMMC_LLI_BUF_LEN / 113 sizeof(struct sdmmc_lli_desc); 114 host->mmc->max_seg_size = host->variant->stm32_idmabsize_mask; 115 } else { 116 host->mmc->max_segs = 1; 117 host->mmc->max_seg_size = host->mmc->max_req_size; 118 } 119 120 return 0; 121 } 122 123 static int sdmmc_idma_start(struct mmci_host *host, unsigned int *datactrl) 124 125 { 126 struct sdmmc_priv *idma = host->dma_priv; 127 struct sdmmc_lli_desc *desc = (struct sdmmc_lli_desc *)idma->sg_cpu; 128 struct mmc_data *data = host->data; 129 struct scatterlist *sg; 130 int i; 131 132 if (!host->variant->dma_lli || data->sg_len == 1) { 133 writel_relaxed(sg_dma_address(data->sg), 134 host->base + MMCI_STM32_IDMABASE0R); 135 writel_relaxed(MMCI_STM32_IDMAEN, 136 host->base + MMCI_STM32_IDMACTRLR); 137 return 0; 138 } 139 140 for_each_sg(data->sg, sg, data->sg_len, i) { 141 desc[i].idmalar = (i + 1) * sizeof(struct sdmmc_lli_desc); 142 desc[i].idmalar |= MMCI_STM32_ULA | MMCI_STM32_ULS 143 | MMCI_STM32_ABR; 144 desc[i].idmabase = sg_dma_address(sg); 145 desc[i].idmasize = sg_dma_len(sg); 146 } 147 148 /* notice the end of link list */ 149 desc[data->sg_len - 1].idmalar &= ~MMCI_STM32_ULA; 150 151 dma_wmb(); 152 writel_relaxed(idma->sg_dma, host->base + MMCI_STM32_IDMABAR); 153 writel_relaxed(desc[0].idmalar, host->base + MMCI_STM32_IDMALAR); 154 writel_relaxed(desc[0].idmabase, host->base + MMCI_STM32_IDMABASE0R); 155 writel_relaxed(desc[0].idmasize, host->base + MMCI_STM32_IDMABSIZER); 156 writel_relaxed(MMCI_STM32_IDMAEN | MMCI_STM32_IDMALLIEN, 157 host->base + MMCI_STM32_IDMACTRLR); 158 159 return 0; 160 } 161 162 static void sdmmc_idma_finalize(struct mmci_host *host, struct mmc_data *data) 163 { 164 writel_relaxed(0, host->base + MMCI_STM32_IDMACTRLR); 165 } 166 167 static void mmci_sdmmc_set_clkreg(struct mmci_host *host, unsigned int desired) 168 { 169 unsigned int clk = 0, ddr = 0; 170 171 if (host->mmc->ios.timing == MMC_TIMING_MMC_DDR52 || 172 host->mmc->ios.timing == MMC_TIMING_UHS_DDR50) 173 ddr = MCI_STM32_CLK_DDR; 174 175 /* 176 * cclk = mclk / (2 * clkdiv) 177 * clkdiv 0 => bypass 178 * in ddr mode bypass is not possible 179 */ 180 if (desired) { 181 if (desired >= host->mclk && !ddr) { 182 host->cclk = host->mclk; 183 } else { 184 clk = DIV_ROUND_UP(host->mclk, 2 * desired); 185 if (clk > MCI_STM32_CLK_CLKDIV_MSK) 186 clk = MCI_STM32_CLK_CLKDIV_MSK; 187 host->cclk = host->mclk / (2 * clk); 188 } 189 } else { 190 /* 191 * while power-on phase the clock can't be define to 0, 192 * Only power-off and power-cyc deactivate the clock. 193 * if desired clock is 0, set max divider 194 */ 195 clk = MCI_STM32_CLK_CLKDIV_MSK; 196 host->cclk = host->mclk / (2 * clk); 197 } 198 199 /* Set actual clock for debug */ 200 if (host->mmc->ios.power_mode == MMC_POWER_ON) 201 host->mmc->actual_clock = host->cclk; 202 else 203 host->mmc->actual_clock = 0; 204 205 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4) 206 clk |= MCI_STM32_CLK_WIDEBUS_4; 207 if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8) 208 clk |= MCI_STM32_CLK_WIDEBUS_8; 209 210 clk |= MCI_STM32_CLK_HWFCEN; 211 clk |= host->clk_reg_add; 212 clk |= ddr; 213 214 /* 215 * SDMMC_FBCK is selected when an external Delay Block is needed 216 * with SDR104. 217 */ 218 if (host->mmc->ios.timing >= MMC_TIMING_UHS_SDR50) { 219 clk |= MCI_STM32_CLK_BUSSPEED; 220 if (host->mmc->ios.timing == MMC_TIMING_UHS_SDR104) { 221 clk &= ~MCI_STM32_CLK_SEL_MSK; 222 clk |= MCI_STM32_CLK_SELFBCK; 223 } 224 } 225 226 mmci_write_clkreg(host, clk); 227 } 228 229 static void mmci_sdmmc_set_pwrreg(struct mmci_host *host, unsigned int pwr) 230 { 231 struct mmc_ios ios = host->mmc->ios; 232 233 pwr = host->pwr_reg_add; 234 235 if (ios.power_mode == MMC_POWER_OFF) { 236 /* Only a reset could power-off sdmmc */ 237 reset_control_assert(host->rst); 238 udelay(2); 239 reset_control_deassert(host->rst); 240 241 /* 242 * Set the SDMMC in Power-cycle state. 243 * This will make that the SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK 244 * are driven low, to prevent the Card from being supplied 245 * through the signal lines. 246 */ 247 mmci_write_pwrreg(host, MCI_STM32_PWR_CYC | pwr); 248 } else if (ios.power_mode == MMC_POWER_ON) { 249 /* 250 * After power-off (reset): the irq mask defined in probe 251 * functionis lost 252 * ault irq mask (probe) must be activated 253 */ 254 writel(MCI_IRQENABLE | host->variant->start_err, 255 host->base + MMCIMASK0); 256 257 /* 258 * After a power-cycle state, we must set the SDMMC in 259 * Power-off. The SDMMC_D[7:0], SDMMC_CMD and SDMMC_CK are 260 * driven high. Then we can set the SDMMC to Power-on state 261 */ 262 mmci_write_pwrreg(host, MCI_PWR_OFF | pwr); 263 mdelay(1); 264 mmci_write_pwrreg(host, MCI_PWR_ON | pwr); 265 } 266 } 267 268 static u32 sdmmc_get_dctrl_cfg(struct mmci_host *host) 269 { 270 u32 datactrl; 271 272 datactrl = mmci_dctrl_blksz(host); 273 274 if (host->mmc->card && mmc_card_sdio(host->mmc->card) && 275 host->data->blocks == 1) 276 datactrl |= MCI_DPSM_STM32_MODE_SDIO; 277 else if (host->data->stop && !host->mrq->sbc) 278 datactrl |= MCI_DPSM_STM32_MODE_BLOCK_STOP; 279 else 280 datactrl |= MCI_DPSM_STM32_MODE_BLOCK; 281 282 return datactrl; 283 } 284 285 static struct mmci_host_ops sdmmc_variant_ops = { 286 .validate_data = sdmmc_idma_validate_data, 287 .prep_data = sdmmc_idma_prep_data, 288 .unprep_data = sdmmc_idma_unprep_data, 289 .get_datactrl_cfg = sdmmc_get_dctrl_cfg, 290 .dma_setup = sdmmc_idma_setup, 291 .dma_start = sdmmc_idma_start, 292 .dma_finalize = sdmmc_idma_finalize, 293 .set_clkreg = mmci_sdmmc_set_clkreg, 294 .set_pwrreg = mmci_sdmmc_set_pwrreg, 295 }; 296 297 void sdmmc_variant_init(struct mmci_host *host) 298 { 299 host->ops = &sdmmc_variant_ops; 300 } 301