1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/drivers/mmc/host/sdhci_f_sdh30.c |
4 | * |
5 | * Copyright (C) 2013 - 2015 Fujitsu Semiconductor, Ltd |
6 | * Vincent Yang <vincent.yang@tw.fujitsu.com> |
7 | * Copyright (C) 2015 Linaro Ltd Andy Green <andy.green@linaro.org> |
8 | * Copyright (C) 2019 Socionext Inc. |
9 | */ |
10 | |
11 | #include <linux/acpi.h> |
12 | #include <linux/err.h> |
13 | #include <linux/delay.h> |
14 | #include <linux/module.h> |
15 | #include <linux/of.h> |
16 | #include <linux/property.h> |
17 | #include <linux/clk.h> |
18 | #include <linux/reset.h> |
19 | |
20 | #include "sdhci-pltfm.h" |
21 | #include "sdhci_f_sdh30.h" |
22 | |
23 | struct f_sdhost_priv { |
24 | struct clk *clk_iface; |
25 | struct clk *clk; |
26 | struct reset_control *rst; |
27 | u32 vendor_hs200; |
28 | struct device *dev; |
29 | bool enable_cmd_dat_delay; |
30 | }; |
31 | |
32 | static void *sdhci_f_sdhost_priv(struct sdhci_host *host) |
33 | { |
34 | struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); |
35 | |
36 | return sdhci_pltfm_priv(host: pltfm_host); |
37 | } |
38 | |
39 | static void sdhci_f_sdh30_soft_voltage_switch(struct sdhci_host *host) |
40 | { |
41 | struct f_sdhost_priv *priv = sdhci_f_sdhost_priv(host); |
42 | u32 ctrl = 0; |
43 | |
44 | usleep_range(min: 2500, max: 3000); |
45 | ctrl = sdhci_readl(host, F_SDH30_IO_CONTROL2); |
46 | ctrl |= F_SDH30_CRES_O_DN; |
47 | sdhci_writel(host, val: ctrl, F_SDH30_IO_CONTROL2); |
48 | ctrl |= F_SDH30_MSEL_O_1_8; |
49 | sdhci_writel(host, val: ctrl, F_SDH30_IO_CONTROL2); |
50 | |
51 | ctrl &= ~F_SDH30_CRES_O_DN; |
52 | sdhci_writel(host, val: ctrl, F_SDH30_IO_CONTROL2); |
53 | usleep_range(min: 2500, max: 3000); |
54 | |
55 | if (priv->vendor_hs200) { |
56 | dev_info(priv->dev, "%s: setting hs200\n" , __func__); |
57 | ctrl = sdhci_readl(host, F_SDH30_ESD_CONTROL); |
58 | ctrl |= priv->vendor_hs200; |
59 | sdhci_writel(host, val: ctrl, F_SDH30_ESD_CONTROL); |
60 | } |
61 | |
62 | ctrl = sdhci_readl(host, F_SDH30_TUNING_SETTING); |
63 | ctrl |= F_SDH30_CMD_CHK_DIS; |
64 | sdhci_writel(host, val: ctrl, F_SDH30_TUNING_SETTING); |
65 | } |
66 | |
67 | static unsigned int sdhci_f_sdh30_get_min_clock(struct sdhci_host *host) |
68 | { |
69 | return F_SDH30_MIN_CLOCK; |
70 | } |
71 | |
72 | static void sdhci_f_sdh30_reset(struct sdhci_host *host, u8 mask) |
73 | { |
74 | struct f_sdhost_priv *priv = sdhci_f_sdhost_priv(host); |
75 | u32 ctl; |
76 | |
77 | if (sdhci_readw(host, SDHCI_CLOCK_CONTROL) == 0) |
78 | sdhci_writew(host, val: 0xBC01, SDHCI_CLOCK_CONTROL); |
79 | |
80 | sdhci_reset(host, mask); |
81 | |
82 | if (priv->enable_cmd_dat_delay) { |
83 | ctl = sdhci_readl(host, F_SDH30_ESD_CONTROL); |
84 | ctl |= F_SDH30_CMD_DAT_DELAY; |
85 | sdhci_writel(host, val: ctl, F_SDH30_ESD_CONTROL); |
86 | } |
87 | |
88 | if ((host->mmc->caps & MMC_CAP_NONREMOVABLE) && |
89 | !(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) { |
90 | ctl = sdhci_readl(host, F_SDH30_TEST); |
91 | ctl |= F_SDH30_FORCE_CARD_INSERT; |
92 | sdhci_writel(host, val: ctl, F_SDH30_TEST); |
93 | } |
94 | } |
95 | |
96 | static const struct sdhci_ops sdhci_f_sdh30_ops = { |
97 | .voltage_switch = sdhci_f_sdh30_soft_voltage_switch, |
98 | .get_min_clock = sdhci_f_sdh30_get_min_clock, |
99 | .reset = sdhci_f_sdh30_reset, |
100 | .set_clock = sdhci_set_clock, |
101 | .set_bus_width = sdhci_set_bus_width, |
102 | .set_uhs_signaling = sdhci_set_uhs_signaling, |
103 | }; |
104 | |
105 | static const struct sdhci_pltfm_data sdhci_f_sdh30_pltfm_data = { |
106 | .ops = &sdhci_f_sdh30_ops, |
107 | .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC |
108 | | SDHCI_QUIRK_INVERTED_WRITE_PROTECT, |
109 | .quirks2 = SDHCI_QUIRK2_SUPPORT_SINGLE |
110 | | SDHCI_QUIRK2_TUNING_WORK_AROUND, |
111 | }; |
112 | |
113 | static int sdhci_f_sdh30_probe(struct platform_device *pdev) |
114 | { |
115 | struct sdhci_host *host; |
116 | struct device *dev = &pdev->dev; |
117 | int ctrl = 0, ret = 0; |
118 | struct f_sdhost_priv *priv; |
119 | struct sdhci_pltfm_host *pltfm_host; |
120 | u32 reg = 0; |
121 | |
122 | host = sdhci_pltfm_init(pdev, pdata: &sdhci_f_sdh30_pltfm_data, |
123 | priv_size: sizeof(struct f_sdhost_priv)); |
124 | if (IS_ERR(ptr: host)) |
125 | return PTR_ERR(ptr: host); |
126 | |
127 | pltfm_host = sdhci_priv(host); |
128 | priv = sdhci_pltfm_priv(host: pltfm_host); |
129 | priv->dev = dev; |
130 | |
131 | priv->enable_cmd_dat_delay = device_property_read_bool(dev, |
132 | propname: "fujitsu,cmd-dat-delay-select" ); |
133 | |
134 | ret = mmc_of_parse(host: host->mmc); |
135 | if (ret) |
136 | goto err; |
137 | |
138 | if (dev_of_node(dev)) { |
139 | sdhci_get_of_property(pdev); |
140 | |
141 | priv->clk_iface = devm_clk_get(dev: &pdev->dev, id: "iface" ); |
142 | if (IS_ERR(ptr: priv->clk_iface)) { |
143 | ret = PTR_ERR(ptr: priv->clk_iface); |
144 | goto err; |
145 | } |
146 | |
147 | ret = clk_prepare_enable(clk: priv->clk_iface); |
148 | if (ret) |
149 | goto err; |
150 | |
151 | priv->clk = devm_clk_get(dev: &pdev->dev, id: "core" ); |
152 | if (IS_ERR(ptr: priv->clk)) { |
153 | ret = PTR_ERR(ptr: priv->clk); |
154 | goto err_clk; |
155 | } |
156 | |
157 | ret = clk_prepare_enable(clk: priv->clk); |
158 | if (ret) |
159 | goto err_clk; |
160 | |
161 | priv->rst = devm_reset_control_get_optional_shared(dev, NULL); |
162 | if (IS_ERR(ptr: priv->rst)) { |
163 | ret = PTR_ERR(ptr: priv->rst); |
164 | goto err_rst; |
165 | } |
166 | |
167 | ret = reset_control_deassert(rstc: priv->rst); |
168 | if (ret) |
169 | goto err_rst; |
170 | } |
171 | |
172 | /* init vendor specific regs */ |
173 | ctrl = sdhci_readw(host, F_SDH30_AHB_CONFIG); |
174 | ctrl |= F_SDH30_SIN | F_SDH30_AHB_INCR_16 | F_SDH30_AHB_INCR_8 | |
175 | F_SDH30_AHB_INCR_4; |
176 | ctrl &= ~(F_SDH30_AHB_BIGED | F_SDH30_BUSLOCK_EN); |
177 | sdhci_writew(host, val: ctrl, F_SDH30_AHB_CONFIG); |
178 | |
179 | reg = sdhci_readl(host, F_SDH30_ESD_CONTROL); |
180 | sdhci_writel(host, val: reg & ~F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); |
181 | msleep(msecs: 20); |
182 | sdhci_writel(host, val: reg | F_SDH30_EMMC_RST, F_SDH30_ESD_CONTROL); |
183 | |
184 | reg = sdhci_readl(host, SDHCI_CAPABILITIES); |
185 | if (reg & SDHCI_CAN_DO_8BIT) |
186 | priv->vendor_hs200 = F_SDH30_EMMC_HS200; |
187 | |
188 | if (!(reg & SDHCI_TIMEOUT_CLK_MASK)) |
189 | host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK; |
190 | |
191 | ret = sdhci_add_host(host); |
192 | if (ret) |
193 | goto err_add_host; |
194 | |
195 | return 0; |
196 | |
197 | err_add_host: |
198 | reset_control_assert(rstc: priv->rst); |
199 | err_rst: |
200 | clk_disable_unprepare(clk: priv->clk); |
201 | err_clk: |
202 | clk_disable_unprepare(clk: priv->clk_iface); |
203 | err: |
204 | sdhci_pltfm_free(pdev); |
205 | |
206 | return ret; |
207 | } |
208 | |
209 | static void sdhci_f_sdh30_remove(struct platform_device *pdev) |
210 | { |
211 | struct sdhci_host *host = platform_get_drvdata(pdev); |
212 | struct f_sdhost_priv *priv = sdhci_f_sdhost_priv(host); |
213 | struct clk *clk_iface = priv->clk_iface; |
214 | struct reset_control *rst = priv->rst; |
215 | struct clk *clk = priv->clk; |
216 | |
217 | sdhci_pltfm_remove(pdev); |
218 | |
219 | reset_control_assert(rstc: rst); |
220 | clk_disable_unprepare(clk); |
221 | clk_disable_unprepare(clk: clk_iface); |
222 | } |
223 | |
224 | #ifdef CONFIG_OF |
225 | static const struct of_device_id f_sdh30_dt_ids[] = { |
226 | { .compatible = "fujitsu,mb86s70-sdhci-3.0" }, |
227 | { .compatible = "socionext,f-sdh30-e51-mmc" }, |
228 | { /* sentinel */ } |
229 | }; |
230 | MODULE_DEVICE_TABLE(of, f_sdh30_dt_ids); |
231 | #endif |
232 | |
233 | #ifdef CONFIG_ACPI |
234 | static const struct acpi_device_id f_sdh30_acpi_ids[] = { |
235 | { "SCX0002" }, |
236 | { /* sentinel */ } |
237 | }; |
238 | MODULE_DEVICE_TABLE(acpi, f_sdh30_acpi_ids); |
239 | #endif |
240 | |
241 | static struct platform_driver sdhci_f_sdh30_driver = { |
242 | .driver = { |
243 | .name = "f_sdh30" , |
244 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
245 | .of_match_table = of_match_ptr(f_sdh30_dt_ids), |
246 | .acpi_match_table = ACPI_PTR(f_sdh30_acpi_ids), |
247 | .pm = &sdhci_pltfm_pmops, |
248 | }, |
249 | .probe = sdhci_f_sdh30_probe, |
250 | .remove_new = sdhci_f_sdh30_remove, |
251 | }; |
252 | |
253 | module_platform_driver(sdhci_f_sdh30_driver); |
254 | |
255 | MODULE_DESCRIPTION("F_SDH30 SD Card Controller driver" ); |
256 | MODULE_LICENSE("GPL v2" ); |
257 | MODULE_AUTHOR("FUJITSU SEMICONDUCTOR LTD., Socionext Inc." ); |
258 | MODULE_ALIAS("platform:f_sdh30" ); |
259 | |