0ae100e62b57ff961bfe6c14ba58d49f1fab4ea7
[platform/kernel/linux-rpi.git] / 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 static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
25 {
26         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
27                 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
28
29         usleep_range(10000, 11000);
30         sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
31         usleep_range(10000, 11000);
32 }
33
34 static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
35 {
36         sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0000);
37         usleep_range(10000, 11000);
38
39         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
40                 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
41
42         usleep_range(10000, 11000);
43 }
44
45 static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
46                                unsigned int new_clock)
47 {
48         unsigned int clock, divisor;
49         u32 clk = 0;
50         int clk_sel;
51
52         if (new_clock == 0) {
53                 tmio_mmc_clk_stop(host);
54                 return;
55         }
56
57         divisor = host->pdata->hclk / new_clock;
58
59         /* bit7 set: 1/512, ... bit0 set: 1/4, all bits clear: 1/2 */
60         clk_sel = (divisor <= 1);
61         clk = clk_sel ? 0 : (roundup_pow_of_two(divisor) >> 2);
62
63         host->pdata->set_clk_div(host->pdev, clk_sel);
64
65         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
66                         sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
67         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
68         usleep_range(10000, 11000);
69
70         tmio_mmc_clk_start(host);
71 }
72
73 #ifdef CONFIG_PM_SLEEP
74 static int tmio_mmc_suspend(struct device *dev)
75 {
76         struct platform_device *pdev = to_platform_device(dev);
77         const struct mfd_cell *cell = mfd_get_cell(pdev);
78         int ret;
79
80         ret = pm_runtime_force_suspend(dev);
81
82         /* Tell MFD core it can disable us now.*/
83         if (!ret && cell->disable)
84                 cell->disable(pdev);
85
86         return ret;
87 }
88
89 static int tmio_mmc_resume(struct device *dev)
90 {
91         struct platform_device *pdev = to_platform_device(dev);
92         const struct mfd_cell *cell = mfd_get_cell(pdev);
93         int ret = 0;
94
95         /* Tell the MFD core we are ready to be enabled */
96         if (cell->resume)
97                 ret = cell->resume(pdev);
98
99         if (!ret)
100                 ret = pm_runtime_force_resume(dev);
101
102         return ret;
103 }
104 #endif
105
106 static int tmio_mmc_probe(struct platform_device *pdev)
107 {
108         const struct mfd_cell *cell = mfd_get_cell(pdev);
109         struct tmio_mmc_data *pdata;
110         struct tmio_mmc_host *host;
111         struct resource *res;
112         int ret = -EINVAL, irq;
113
114         if (pdev->num_resources != 2)
115                 goto out;
116
117         pdata = pdev->dev.platform_data;
118         if (!pdata || !pdata->hclk)
119                 goto out;
120
121         irq = platform_get_irq(pdev, 0);
122         if (irq < 0) {
123                 ret = irq;
124                 goto out;
125         }
126
127         /* Tell the MFD core we are ready to be enabled */
128         if (cell->enable) {
129                 ret = cell->enable(pdev);
130                 if (ret)
131                         goto out;
132         }
133
134         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
135         if (!res) {
136                 ret = -EINVAL;
137                 goto cell_disable;
138         }
139
140         pdata->flags |= TMIO_MMC_HAVE_HIGH_REG;
141
142         host = tmio_mmc_host_alloc(pdev, pdata);
143         if (IS_ERR(host)) {
144                 ret = PTR_ERR(host);
145                 goto cell_disable;
146         }
147
148         /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
149         host->bus_shift = resource_size(res) >> 10;
150         host->set_clock = tmio_mmc_set_clock;
151
152         host->mmc->f_max = pdata->hclk;
153         host->mmc->f_min = pdata->hclk / 512;
154
155         ret = tmio_mmc_host_probe(host);
156         if (ret)
157                 goto host_free;
158
159         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
160                                IRQF_TRIGGER_FALLING,
161                                dev_name(&pdev->dev), host);
162         if (ret)
163                 goto host_remove;
164
165         pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
166                 (unsigned long)host->ctl, irq);
167
168         return 0;
169
170 host_remove:
171         tmio_mmc_host_remove(host);
172 host_free:
173         tmio_mmc_host_free(host);
174 cell_disable:
175         if (cell->disable)
176                 cell->disable(pdev);
177 out:
178         return ret;
179 }
180
181 static int tmio_mmc_remove(struct platform_device *pdev)
182 {
183         const struct mfd_cell *cell = mfd_get_cell(pdev);
184         struct tmio_mmc_host *host = platform_get_drvdata(pdev);
185
186         tmio_mmc_host_remove(host);
187         if (cell->disable)
188                 cell->disable(pdev);
189
190         return 0;
191 }
192
193 /* ------------------- device registration ----------------------- */
194
195 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
196         SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
197         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
198                            tmio_mmc_host_runtime_resume, NULL)
199 };
200
201 static struct platform_driver tmio_mmc_driver = {
202         .driver = {
203                 .name = "tmio-mmc",
204                 .pm = &tmio_mmc_dev_pm_ops,
205         },
206         .probe = tmio_mmc_probe,
207         .remove = tmio_mmc_remove,
208 };
209
210 module_platform_driver(tmio_mmc_driver);
211
212 MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
213 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
214 MODULE_LICENSE("GPL v2");
215 MODULE_ALIAS("platform:tmio-mmc");