drivers/mmc/host/tmio_mmc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for the MMC / SD / SDIO cell found in:
   4  *
   5  * TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
   6  *
   7  * Copyright (C) 2017 Renesas Electronics Corporation
   8  * Copyright (C) 2017 Horms Solutions, Simon Horman
   9  * Copyright (C) 2007 Ian Molton
  10  * Copyright (C) 2004 Ian Molton
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/device.h>
  15 #include <linux/mfd/core.h>
  16 #include <linux/mfd/tmio.h>
  17 #include <linux/mmc/host.h>
  18 #include <linux/module.h>
  19 #include <linux/pagemap.h>
  20 #include <linux/scatterlist.h>
  21
  22 #include "tmio_mmc.h"
  23
  24 /* Registers specific to this variant */
  25 #define CTL_SDIO_REGS           0x100
  26 #define CTL_CLK_AND_WAIT_CTL    0x138
  27 #define CTL_RESET_SDIO          0x1e0
  28
  29 static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
  30 {
  31         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
  32                 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
  33
  34         usleep_range(10000, 11000);
  35         sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
  36         usleep_range(10000, 11000);
  37 }
  38
  39 static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
  40 {
  41         sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
  42         usleep_range(10000, 11000);
  43
  44         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
  45                 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
  46
  47         usleep_range(10000, 11000);
  48 }
  49
  50 static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
  51                                unsigned int new_clock)
  52 {
  53         unsigned int divisor;
  54         u32 clk = 0;
  55         int clk_sel;
  56
  57         if (new_clock == 0) {
  58                 tmio_mmc_clk_stop(host);
  59                 return;
  60         }
  61
  62         divisor = host->pdata->hclk / new_clock;
  63
  64         /* bit7 set: 1/512, ... bit0 set: 1/4, all bits clear: 1/2 */
  65         clk_sel = (divisor <= 1);
  66         clk = clk_sel ? 0 : (roundup_pow_of_two(divisor) >> 2);
  67
  68         host->pdata->set_clk_div(host->pdev, clk_sel);
  69
  70         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
  71                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
  72         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
  73         usleep_range(10000, 11000);
  74
  75         tmio_mmc_clk_start(host);
  76 }
  77
  78 static void tmio_mmc_reset(struct tmio_mmc_host *host)
  79 {
  80         sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
  81         usleep_range(10000, 11000);
  82         sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
  83         usleep_range(10000, 11000);
  84 }
  85
  86 #ifdef CONFIG_PM_SLEEP
  87 static int tmio_mmc_suspend(struct device *dev)
  88 {
  89         struct platform_device *pdev = to_platform_device(dev);
  90         const struct mfd_cell *cell = mfd_get_cell(pdev);
  91         int ret;
  92
  93         ret = pm_runtime_force_suspend(dev);
  94
  95         /* Tell MFD core it can disable us now.*/
  96         if (!ret && cell->disable)
  97                 cell->disable(pdev);
  98
  99         return ret;
 100 }
 101
 102 static int tmio_mmc_resume(struct device *dev)
 103 {
 104         struct platform_device *pdev = to_platform_device(dev);
 105         const struct mfd_cell *cell = mfd_get_cell(pdev);
 106         int ret = 0;
 107
 108         /* Tell the MFD core we are ready to be enabled */
 109         if (cell->resume)
 110                 ret = cell->resume(pdev);
 111
 112         if (!ret)
 113                 ret = pm_runtime_force_resume(dev);
 114
 115         return ret;
 116 }
 117 #endif
 118
 119 static int tmio_mmc_probe(struct platform_device *pdev)
 120 {
 121         const struct mfd_cell *cell = mfd_get_cell(pdev);
 122         struct tmio_mmc_data *pdata;
 123         struct tmio_mmc_host *host;
 124         struct resource *res;
 125         int ret = -EINVAL, irq;
 126
 127         if (pdev->num_resources != 2)
 128                 goto out;
 129
 130         pdata = pdev->dev.platform_data;
 131         if (!pdata || !pdata->hclk)
 132                 goto out;
 133
 134         irq = platform_get_irq(pdev, 0);
 135         if (irq < 0) {
 136                 ret = irq;
 137                 goto out;
 138         }
 139
 140         /* Tell the MFD core we are ready to be enabled */
 141         if (cell->enable) {
 142                 ret = cell->enable(pdev);
 143                 if (ret)
 144                         goto out;
 145         }
 146
 147         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 148         if (!res) {
 149                 ret = -EINVAL;
 150                 goto cell_disable;
 151         }
 152
 153         host = tmio_mmc_host_alloc(pdev, pdata);
 154         if (IS_ERR(host)) {
 155                 ret = PTR_ERR(host);
 156                 goto cell_disable;
 157         }
 158
 159         /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
 160         host->bus_shift = resource_size(res) >> 10;
 161         host->set_clock = tmio_mmc_set_clock;
 162         host->reset = tmio_mmc_reset;
 163
 164         host->mmc->f_max = pdata->hclk;
 165         host->mmc->f_min = pdata->hclk / 512;
 166
 167         ret = tmio_mmc_host_probe(host);
 168         if (ret)
 169                 goto host_free;
 170
 171         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
 172                                IRQF_TRIGGER_FALLING,
 173                                dev_name(&pdev->dev), host);
 174         if (ret)
 175                 goto host_remove;
 176
 177         pr_info("%s at 0x%p irq %d\n", mmc_hostname(host->mmc), host->ctl, irq);
 178
 179         return 0;
 180
 181 host_remove:
 182         tmio_mmc_host_remove(host);
 183 host_free:
 184         tmio_mmc_host_free(host);
 185 cell_disable:
 186         if (cell->disable)
 187                 cell->disable(pdev);
 188 out:
 189         return ret;
 190 }
 191
 192 static int tmio_mmc_remove(struct platform_device *pdev)
 193 {
 194         const struct mfd_cell *cell = mfd_get_cell(pdev);
 195         struct tmio_mmc_host *host = platform_get_drvdata(pdev);
 196
 197         tmio_mmc_host_remove(host);
 198         if (cell->disable)
 199                 cell->disable(pdev);
 200
 201         return 0;
 202 }
 203
 204 /* ------------------- device registration ----------------------- */
 205
 206 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
 207         SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
 208         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
 209                            tmio_mmc_host_runtime_resume, NULL)
 210 };
 211
 212 static struct platform_driver tmio_mmc_driver = {
 213         .driver = {
 214                 .name = "tmio-mmc",
 215                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 216                 .pm = &tmio_mmc_dev_pm_ops,
 217         },
 218         .probe = tmio_mmc_probe,
 219         .remove = tmio_mmc_remove,
 220 };
 221
 222 module_platform_driver(tmio_mmc_driver);
 223
 224 MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
 225 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
 226 MODULE_LICENSE("GPL v2");
 227 MODULE_ALIAS("platform:tmio-mmc");