drivers/mmc/host/mmci_qcom_dml.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *
   4  * Copyright (c) 2011, The Linux Foundation. All rights reserved.
   5  */
   6 #include <linux/of.h>
   7 #include <linux/of_dma.h>
   8 #include <linux/bitops.h>
   9 #include <linux/mmc/host.h>
  10 #include <linux/mmc/card.h>
  11 #include "mmci.h"
  12
  13 /* Registers */
  14 #define DML_CONFIG                      0x00
  15 #define PRODUCER_CRCI_MSK               GENMASK(1, 0)
  16 #define PRODUCER_CRCI_DISABLE           0
  17 #define PRODUCER_CRCI_X_SEL             BIT(0)
  18 #define PRODUCER_CRCI_Y_SEL             BIT(1)
  19 #define CONSUMER_CRCI_MSK               GENMASK(3, 2)
  20 #define CONSUMER_CRCI_DISABLE           0
  21 #define CONSUMER_CRCI_X_SEL             BIT(2)
  22 #define CONSUMER_CRCI_Y_SEL             BIT(3)
  23 #define PRODUCER_TRANS_END_EN           BIT(4)
  24 #define BYPASS                          BIT(16)
  25 #define DIRECT_MODE                     BIT(17)
  26 #define INFINITE_CONS_TRANS             BIT(18)
  27
  28 #define DML_SW_RESET                    0x08
  29 #define DML_PRODUCER_START              0x0c
  30 #define DML_CONSUMER_START              0x10
  31 #define DML_PRODUCER_PIPE_LOGICAL_SIZE  0x14
  32 #define DML_CONSUMER_PIPE_LOGICAL_SIZE  0x18
  33 #define DML_PIPE_ID                     0x1c
  34 #define PRODUCER_PIPE_ID_SHFT           0
  35 #define PRODUCER_PIPE_ID_MSK            GENMASK(4, 0)
  36 #define CONSUMER_PIPE_ID_SHFT           16
  37 #define CONSUMER_PIPE_ID_MSK            GENMASK(20, 16)
  38
  39 #define DML_PRODUCER_BAM_BLOCK_SIZE     0x24
  40 #define DML_PRODUCER_BAM_TRANS_SIZE     0x28
  41
  42 /* other definitions */
  43 #define PRODUCER_PIPE_LOGICAL_SIZE      4096
  44 #define CONSUMER_PIPE_LOGICAL_SIZE      4096
  45
  46 #define DML_OFFSET                      0x800
  47
  48 static int qcom_dma_start(struct mmci_host *host, unsigned int *datactrl)
  49 {
  50         u32 config;
  51         void __iomem *base = host->base + DML_OFFSET;
  52         struct mmc_data *data = host->data;
  53         int ret = mmci_dmae_start(host, datactrl);
  54
  55         if (ret)
  56                 return ret;
  57
  58         if (data->flags & MMC_DATA_READ) {
  59                 /* Read operation: configure DML for producer operation */
  60                 /* Set producer CRCI-x and disable consumer CRCI */
  61                 config = readl_relaxed(base + DML_CONFIG);
  62                 config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_X_SEL;
  63                 config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_DISABLE;
  64                 writel_relaxed(config, base + DML_CONFIG);
  65
  66                 /* Set the Producer BAM block size */
  67                 writel_relaxed(data->blksz, base + DML_PRODUCER_BAM_BLOCK_SIZE);
  68
  69                 /* Set Producer BAM Transaction size */
  70                 writel_relaxed(data->blocks * data->blksz,
  71                                base + DML_PRODUCER_BAM_TRANS_SIZE);
  72                 /* Set Producer Transaction End bit */
  73                 config = readl_relaxed(base + DML_CONFIG);
  74                 config |= PRODUCER_TRANS_END_EN;
  75                 writel_relaxed(config, base + DML_CONFIG);
  76                 /* Trigger producer */
  77                 writel_relaxed(1, base + DML_PRODUCER_START);
  78         } else {
  79                 /* Write operation: configure DML for consumer operation */
  80                 /* Set consumer CRCI-x and disable producer CRCI*/
  81                 config = readl_relaxed(base + DML_CONFIG);
  82                 config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_X_SEL;
  83                 config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_DISABLE;
  84                 writel_relaxed(config, base + DML_CONFIG);
  85                 /* Clear Producer Transaction End bit */
  86                 config = readl_relaxed(base + DML_CONFIG);
  87                 config &= ~PRODUCER_TRANS_END_EN;
  88                 writel_relaxed(config, base + DML_CONFIG);
  89                 /* Trigger consumer */
  90                 writel_relaxed(1, base + DML_CONSUMER_START);
  91         }
  92
  93         /* make sure the dml is configured before dma is triggered */
  94         wmb();
  95         return 0;
  96 }
  97
  98 static int of_get_dml_pipe_index(struct device_node *np, const char *name)
  99 {
 100         int index;
 101         struct of_phandle_args  dma_spec;
 102
 103         index = of_property_match_string(np, "dma-names", name);
 104
 105         if (index < 0)
 106                 return -ENODEV;
 107
 108         if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
 109                                        &dma_spec))
 110                 return -ENODEV;
 111
 112         if (dma_spec.args_count)
 113                 return dma_spec.args[0];
 114
 115         return -ENODEV;
 116 }
 117
 118 /* Initialize the dml hardware connected to SD Card controller */
 119 static int qcom_dma_setup(struct mmci_host *host)
 120 {
 121         u32 config;
 122         void __iomem *base;
 123         int consumer_id, producer_id;
 124         struct device_node *np = host->mmc->parent->of_node;
 125
 126         if (mmci_dmae_setup(host))
 127                 return -EINVAL;
 128
 129         consumer_id = of_get_dml_pipe_index(np, "tx");
 130         producer_id = of_get_dml_pipe_index(np, "rx");
 131
 132         if (producer_id < 0 || consumer_id < 0) {
 133                 mmci_dmae_release(host);
 134                 return -EINVAL;
 135         }
 136
 137         base = host->base + DML_OFFSET;
 138
 139         /* Reset the DML block */
 140         writel_relaxed(1, base + DML_SW_RESET);
 141
 142         /* Disable the producer and consumer CRCI */
 143         config = (PRODUCER_CRCI_DISABLE | CONSUMER_CRCI_DISABLE);
 144         /*
 145          * Disable the bypass mode. Bypass mode will only be used
 146          * if data transfer is to happen in PIO mode and don't
 147          * want the BAM interface to connect with SDCC-DML.
 148          */
 149         config &= ~BYPASS;
 150         /*
 151          * Disable direct mode as we don't DML to MASTER the AHB bus.
 152          * BAM connected with DML should MASTER the AHB bus.
 153          */
 154         config &= ~DIRECT_MODE;
 155         /*
 156          * Disable infinite mode transfer as we won't be doing any
 157          * infinite size data transfers. All data transfer will be
 158          * of finite data size.
 159          */
 160         config &= ~INFINITE_CONS_TRANS;
 161         writel_relaxed(config, base + DML_CONFIG);
 162
 163         /*
 164          * Initialize the logical BAM pipe size for producer
 165          * and consumer.
 166          */
 167         writel_relaxed(PRODUCER_PIPE_LOGICAL_SIZE,
 168                        base + DML_PRODUCER_PIPE_LOGICAL_SIZE);
 169         writel_relaxed(CONSUMER_PIPE_LOGICAL_SIZE,
 170                        base + DML_CONSUMER_PIPE_LOGICAL_SIZE);
 171
 172         /* Initialize Producer/consumer pipe id */
 173         writel_relaxed(producer_id | (consumer_id << CONSUMER_PIPE_ID_SHFT),
 174                        base + DML_PIPE_ID);
 175
 176         /* Make sure dml initialization is finished */
 177         mb();
 178
 179         return 0;
 180 }
 181
 182 static u32 qcom_get_dctrl_cfg(struct mmci_host *host)
 183 {
 184         return MCI_DPSM_ENABLE | (host->data->blksz << 4);
 185 }
 186
 187 static struct mmci_host_ops qcom_variant_ops = {
 188         .prep_data = mmci_dmae_prep_data,
 189         .unprep_data = mmci_dmae_unprep_data,
 190         .get_datactrl_cfg = qcom_get_dctrl_cfg,
 191         .get_next_data = mmci_dmae_get_next_data,
 192         .dma_setup = qcom_dma_setup,
 193         .dma_release = mmci_dmae_release,
 194         .dma_start = qcom_dma_start,
 195         .dma_finalize = mmci_dmae_finalize,
 196         .dma_error = mmci_dmae_error,
 197 };
 198
 199 void qcom_variant_init(struct mmci_host *host)
 200 {
 201         host->ops = &qcom_variant_ops;
 202 }