Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-2.6.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 /* 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         /* FIXME - should we set stop clock reg here */
81         sd_ctrl_write16(host, CTL_RESET_SD, 0x0000);
82         sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0000);
83         usleep_range(10000, 11000);
84         sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
85         sd_ctrl_write16(host, CTL_RESET_SDIO, 0x0001);
86         usleep_range(10000, 11000);
87
88         if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) {
89                 sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
90                 sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
91         }
92 }
93
94 #ifdef CONFIG_PM_SLEEP
95 static int tmio_mmc_suspend(struct device *dev)
96 {
97         struct platform_device *pdev = to_platform_device(dev);
98         const struct mfd_cell *cell = mfd_get_cell(pdev);
99         int ret;
100
101         ret = pm_runtime_force_suspend(dev);
102
103         /* Tell MFD core it can disable us now.*/
104         if (!ret && cell->disable)
105                 cell->disable(pdev);
106
107         return ret;
108 }
109
110 static int tmio_mmc_resume(struct device *dev)
111 {
112         struct platform_device *pdev = to_platform_device(dev);
113         const struct mfd_cell *cell = mfd_get_cell(pdev);
114         int ret = 0;
115
116         /* Tell the MFD core we are ready to be enabled */
117         if (cell->resume)
118                 ret = cell->resume(pdev);
119
120         if (!ret)
121                 ret = pm_runtime_force_resume(dev);
122
123         return ret;
124 }
125 #endif
126
127 static int tmio_mmc_probe(struct platform_device *pdev)
128 {
129         const struct mfd_cell *cell = mfd_get_cell(pdev);
130         struct tmio_mmc_data *pdata;
131         struct tmio_mmc_host *host;
132         struct resource *res;
133         int ret = -EINVAL, irq;
134
135         if (pdev->num_resources != 2)
136                 goto out;
137
138         pdata = pdev->dev.platform_data;
139         if (!pdata || !pdata->hclk)
140                 goto out;
141
142         irq = platform_get_irq(pdev, 0);
143         if (irq < 0) {
144                 ret = irq;
145                 goto out;
146         }
147
148         /* Tell the MFD core we are ready to be enabled */
149         if (cell->enable) {
150                 ret = cell->enable(pdev);
151                 if (ret)
152                         goto out;
153         }
154
155         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
156         if (!res) {
157                 ret = -EINVAL;
158                 goto cell_disable;
159         }
160
161         host = tmio_mmc_host_alloc(pdev, pdata);
162         if (IS_ERR(host)) {
163                 ret = PTR_ERR(host);
164                 goto cell_disable;
165         }
166
167         /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
168         host->bus_shift = resource_size(res) >> 10;
169         host->set_clock = tmio_mmc_set_clock;
170         host->reset = tmio_mmc_reset;
171
172         host->mmc->f_max = pdata->hclk;
173         host->mmc->f_min = pdata->hclk / 512;
174
175         ret = tmio_mmc_host_probe(host);
176         if (ret)
177                 goto host_free;
178
179         ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq,
180                                IRQF_TRIGGER_FALLING,
181                                dev_name(&pdev->dev), host);
182         if (ret)
183                 goto host_remove;
184
185         pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
186                 (unsigned long)host->ctl, irq);
187
188         return 0;
189
190 host_remove:
191         tmio_mmc_host_remove(host);
192 host_free:
193         tmio_mmc_host_free(host);
194 cell_disable:
195         if (cell->disable)
196                 cell->disable(pdev);
197 out:
198         return ret;
199 }
200
201 static int tmio_mmc_remove(struct platform_device *pdev)
202 {
203         const struct mfd_cell *cell = mfd_get_cell(pdev);
204         struct tmio_mmc_host *host = platform_get_drvdata(pdev);
205
206         tmio_mmc_host_remove(host);
207         if (cell->disable)
208                 cell->disable(pdev);
209
210         return 0;
211 }
212
213 /* ------------------- device registration ----------------------- */
214
215 static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
216         SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
217         SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
218                            tmio_mmc_host_runtime_resume, NULL)
219 };
220
221 static struct platform_driver tmio_mmc_driver = {
222         .driver = {
223                 .name = "tmio-mmc",
224                 .pm = &tmio_mmc_dev_pm_ops,
225         },
226         .probe = tmio_mmc_probe,
227         .remove = tmio_mmc_remove,
228 };
229
230 module_platform_driver(tmio_mmc_driver);
231
232 MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
233 MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
234 MODULE_LICENSE("GPL v2");
235 MODULE_ALIAS("platform:tmio-mmc");