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
tmio_mmc_clk_start(struct tmio_mmc_host * host)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
tmio_mmc_clk_stop(struct tmio_mmc_host * host)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
tmio_mmc_set_clock(struct tmio_mmc_host * host,unsigned int new_clock)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
tmio_mmc_reset(struct tmio_mmc_host * host)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
tmio_mmc_suspend(struct device * dev)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
tmio_mmc_resume(struct device * dev)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
tmio_mmc_probe(struct platform_device * pdev)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
tmio_mmc_remove(struct platform_device * pdev)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");
236
