kernel/drivers/mmc/host/mmci_qcom_dml.c

   1 /*
   2  *
   3  * Copyright (c) 2011, The Linux Foundation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 and
   7  * only version 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  */
  15 #include <linux/of.h>
  16 #include <linux/of_dma.h>
  17 #include <linux/bitops.h>
  18 #include <linux/mmc/host.h>
  19 #include <linux/mmc/card.h>
  20 #include "mmci.h"
  21
  22 /* Registers */
  23 #define DML_CONFIG                      0x00
  24 #define PRODUCER_CRCI_MSK               GENMASK(1, 0)
  25 #define PRODUCER_CRCI_DISABLE           0
  26 #define PRODUCER_CRCI_X_SEL             BIT(0)
  27 #define PRODUCER_CRCI_Y_SEL             BIT(1)
  28 #define CONSUMER_CRCI_MSK               GENMASK(3, 2)
  29 #define CONSUMER_CRCI_DISABLE           0
  30 #define CONSUMER_CRCI_X_SEL             BIT(2)
  31 #define CONSUMER_CRCI_Y_SEL             BIT(3)
  32 #define PRODUCER_TRANS_END_EN           BIT(4)
  33 #define BYPASS                          BIT(16)
  34 #define DIRECT_MODE                     BIT(17)
  35 #define INFINITE_CONS_TRANS             BIT(18)
  36
  37 #define DML_SW_RESET                    0x08
  38 #define DML_PRODUCER_START              0x0c
  39 #define DML_CONSUMER_START              0x10
  40 #define DML_PRODUCER_PIPE_LOGICAL_SIZE  0x14
  41 #define DML_CONSUMER_PIPE_LOGICAL_SIZE  0x18
  42 #define DML_PIPE_ID                     0x1c
  43 #define PRODUCER_PIPE_ID_SHFT           0
  44 #define PRODUCER_PIPE_ID_MSK            GENMASK(4, 0)
  45 #define CONSUMER_PIPE_ID_SHFT           16
  46 #define CONSUMER_PIPE_ID_MSK            GENMASK(20, 16)
  47
  48 #define DML_PRODUCER_BAM_BLOCK_SIZE     0x24
  49 #define DML_PRODUCER_BAM_TRANS_SIZE     0x28
  50
  51 /* other definitions */
  52 #define PRODUCER_PIPE_LOGICAL_SIZE      4096
  53 #define CONSUMER_PIPE_LOGICAL_SIZE      4096
  54
  55 #define DML_OFFSET                      0x800
  56
  57 void dml_start_xfer(struct mmci_host *host, struct mmc_data *data)
  58 {
  59         u32 config;
  60         void __iomem *base = host->base + DML_OFFSET;
  61
  62         if (data->flags & MMC_DATA_READ) {
  63                 /* Read operation: configure DML for producer operation */
  64                 /* Set producer CRCI-x and disable consumer CRCI */
  65                 config = readl_relaxed(base + DML_CONFIG);
  66                 config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_X_SEL;
  67                 config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_DISABLE;
  68                 writel_relaxed(config, base + DML_CONFIG);
  69
  70                 /* Set the Producer BAM block size */
  71                 writel_relaxed(data->blksz, base + DML_PRODUCER_BAM_BLOCK_SIZE);
  72
  73                 /* Set Producer BAM Transaction size */
  74                 writel_relaxed(data->blocks * data->blksz,
  75                                base + DML_PRODUCER_BAM_TRANS_SIZE);
  76                 /* Set Producer Transaction End bit */
  77                 config = readl_relaxed(base + DML_CONFIG);
  78                 config |= PRODUCER_TRANS_END_EN;
  79                 writel_relaxed(config, base + DML_CONFIG);
  80                 /* Trigger producer */
  81                 writel_relaxed(1, base + DML_PRODUCER_START);
  82         } else {
  83                 /* Write operation: configure DML for consumer operation */
  84                 /* Set consumer CRCI-x and disable producer CRCI*/
  85                 config = readl_relaxed(base + DML_CONFIG);
  86                 config = (config & ~CONSUMER_CRCI_MSK) | CONSUMER_CRCI_X_SEL;
  87                 config = (config & ~PRODUCER_CRCI_MSK) | PRODUCER_CRCI_DISABLE;
  88                 writel_relaxed(config, base + DML_CONFIG);
  89                 /* Clear Producer Transaction End bit */
  90                 config = readl_relaxed(base + DML_CONFIG);
  91                 config &= ~PRODUCER_TRANS_END_EN;
  92                 writel_relaxed(config, base + DML_CONFIG);
  93                 /* Trigger consumer */
  94                 writel_relaxed(1, base + DML_CONSUMER_START);
  95         }
  96
  97         /* make sure the dml is configured before dma is triggered */
  98         wmb();
  99 }
 100
 101 static int of_get_dml_pipe_index(struct device_node *np, const char *name)
 102 {
 103         int index;
 104         struct of_phandle_args  dma_spec;
 105
 106         index = of_property_match_string(np, "dma-names", name);
 107
 108         if (index < 0)
 109                 return -ENODEV;
 110
 111         if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index,
 112                                        &dma_spec))
 113                 return -ENODEV;
 114
 115         if (dma_spec.args_count)
 116                 return dma_spec.args[0];
 117
 118         return -ENODEV;
 119 }
 120
 121 /* Initialize the dml hardware connected to SD Card controller */
 122 int dml_hw_init(struct mmci_host *host, struct device_node *np)
 123 {
 124         u32 config;
 125         void __iomem *base;
 126         int consumer_id, producer_id;
 127
 128         consumer_id = of_get_dml_pipe_index(np, "tx");
 129         producer_id = of_get_dml_pipe_index(np, "rx");
 130
 131         if (producer_id < 0 || consumer_id < 0)
 132                 return -ENODEV;
 133
 134         base = host->base + DML_OFFSET;
 135
 136         /* Reset the DML block */
 137         writel_relaxed(1, base + DML_SW_RESET);
 138
 139         /* Disable the producer and consumer CRCI */
 140         config = (PRODUCER_CRCI_DISABLE | CONSUMER_CRCI_DISABLE);
 141         /*
 142          * Disable the bypass mode. Bypass mode will only be used
 143          * if data transfer is to happen in PIO mode and don't
 144          * want the BAM interface to connect with SDCC-DML.
 145          */
 146         config &= ~BYPASS;
 147         /*
 148          * Disable direct mode as we don't DML to MASTER the AHB bus.
 149          * BAM connected with DML should MASTER the AHB bus.
 150          */
 151         config &= ~DIRECT_MODE;
 152         /*
 153          * Disable infinite mode transfer as we won't be doing any
 154          * infinite size data transfers. All data transfer will be
 155          * of finite data size.
 156          */
 157         config &= ~INFINITE_CONS_TRANS;
 158         writel_relaxed(config, base + DML_CONFIG);
 159
 160         /*
 161          * Initialize the logical BAM pipe size for producer
 162          * and consumer.
 163          */
 164         writel_relaxed(PRODUCER_PIPE_LOGICAL_SIZE,
 165                        base + DML_PRODUCER_PIPE_LOGICAL_SIZE);
 166         writel_relaxed(CONSUMER_PIPE_LOGICAL_SIZE,
 167                        base + DML_CONSUMER_PIPE_LOGICAL_SIZE);
 168
 169         /* Initialize Producer/consumer pipe id */
 170         writel_relaxed(producer_id | (consumer_id << CONSUMER_PIPE_ID_SHFT),
 171                        base + DML_PIPE_ID);
 172
 173         /* Make sure dml intialization is finished */
 174         mb();
 175
 176         return 0;
 177 }