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11#include <linux/err.h>
12#include <linux/init.h>
13#include <linux/platform_device.h>
14#include <linux/clk.h>
15#include <linux/module.h>
16#include <linux/io.h>
17#include <linux/mmc/card.h>
18#include <linux/mmc/host.h>
19#include <linux/platform_data/pxa_sdhci.h>
20#include <linux/slab.h>
21#include <linux/of.h>
22#include <linux/of_device.h>
23
24#include "sdhci.h"
25#include "sdhci-pltfm.h"
26
27#define SD_FIFO_PARAM 0xe0
28#define DIS_PAD_SD_CLK_GATE 0x0400
29#define CLK_GATE_ON 0x0200
30#define CLK_GATE_CTL 0x0100
31#define CLK_GATE_SETTING_BITS (DIS_PAD_SD_CLK_GATE | \
32 CLK_GATE_ON | CLK_GATE_CTL)
33
34#define SD_CLOCK_BURST_SIZE_SETUP 0xe6
35#define SDCLK_SEL_SHIFT 8
36#define SDCLK_SEL_MASK 0x3
37#define SDCLK_DELAY_SHIFT 10
38#define SDCLK_DELAY_MASK 0x3c
39
40#define SD_CE_ATA_2 0xea
41#define MMC_CARD 0x1000
42#define MMC_WIDTH 0x0100
43
44static void pxav2_reset(struct sdhci_host *host, u8 mask)
45{
46 struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
47 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
48
49 sdhci_reset(host, mask);
50
51 if (mask == SDHCI_RESET_ALL) {
52 u16 tmp = 0;
53
54
55
56
57
58 if (pdata && pdata->clk_delay_sel == 1) {
59 tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
60
61 tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT);
62 tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
63 << SDCLK_DELAY_SHIFT;
64 tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT);
65 tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT;
66
67 writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
68 }
69
70 if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) {
71 tmp = readw(host->ioaddr + SD_FIFO_PARAM);
72 tmp &= ~CLK_GATE_SETTING_BITS;
73 writew(tmp, host->ioaddr + SD_FIFO_PARAM);
74 } else {
75 tmp = readw(host->ioaddr + SD_FIFO_PARAM);
76 tmp &= ~CLK_GATE_SETTING_BITS;
77 tmp |= CLK_GATE_SETTING_BITS;
78 writew(tmp, host->ioaddr + SD_FIFO_PARAM);
79 }
80 }
81}
82
83static void pxav2_mmc_set_bus_width(struct sdhci_host *host, int width)
84{
85 u8 ctrl;
86 u16 tmp;
87
88 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
89 tmp = readw(host->ioaddr + SD_CE_ATA_2);
90 if (width == MMC_BUS_WIDTH_8) {
91 ctrl &= ~SDHCI_CTRL_4BITBUS;
92 tmp |= MMC_CARD | MMC_WIDTH;
93 } else {
94 tmp &= ~(MMC_CARD | MMC_WIDTH);
95 if (width == MMC_BUS_WIDTH_4)
96 ctrl |= SDHCI_CTRL_4BITBUS;
97 else
98 ctrl &= ~SDHCI_CTRL_4BITBUS;
99 }
100 writew(tmp, host->ioaddr + SD_CE_ATA_2);
101 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
102}
103
104static const struct sdhci_ops pxav2_sdhci_ops = {
105 .set_clock = sdhci_set_clock,
106 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
107 .set_bus_width = pxav2_mmc_set_bus_width,
108 .reset = pxav2_reset,
109 .set_uhs_signaling = sdhci_set_uhs_signaling,
110};
111
112#ifdef CONFIG_OF
113static const struct of_device_id sdhci_pxav2_of_match[] = {
114 {
115 .compatible = "mrvl,pxav2-mmc",
116 },
117 {},
118};
119MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match);
120
121static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
122{
123 struct sdhci_pxa_platdata *pdata;
124 struct device_node *np = dev->of_node;
125 u32 bus_width;
126 u32 clk_delay_cycles;
127
128 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
129 if (!pdata)
130 return NULL;
131
132 if (of_find_property(np, "non-removable", NULL))
133 pdata->flags |= PXA_FLAG_CARD_PERMANENT;
134
135 of_property_read_u32(np, "bus-width", &bus_width);
136 if (bus_width == 8)
137 pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT;
138
139 of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
140 if (clk_delay_cycles > 0) {
141 pdata->clk_delay_sel = 1;
142 pdata->clk_delay_cycles = clk_delay_cycles;
143 }
144
145 return pdata;
146}
147#else
148static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
149{
150 return NULL;
151}
152#endif
153
154static int sdhci_pxav2_probe(struct platform_device *pdev)
155{
156 struct sdhci_pltfm_host *pltfm_host;
157 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
158 struct device *dev = &pdev->dev;
159 struct sdhci_host *host = NULL;
160 const struct of_device_id *match;
161
162 int ret;
163 struct clk *clk;
164
165 host = sdhci_pltfm_init(pdev, NULL, 0);
166 if (IS_ERR(host))
167 return PTR_ERR(host);
168
169 pltfm_host = sdhci_priv(host);
170
171 clk = devm_clk_get(dev, "PXA-SDHCLK");
172 if (IS_ERR(clk)) {
173 dev_err(dev, "failed to get io clock\n");
174 ret = PTR_ERR(clk);
175 goto free;
176 }
177 pltfm_host->clk = clk;
178 ret = clk_prepare_enable(clk);
179 if (ret) {
180 dev_err(&pdev->dev, "failed to enable io clock\n");
181 goto free;
182 }
183
184 host->quirks = SDHCI_QUIRK_BROKEN_ADMA
185 | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
186 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
187
188 match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev);
189 if (match) {
190 pdata = pxav2_get_mmc_pdata(dev);
191 }
192 if (pdata) {
193 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {
194
195 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
196 host->mmc->caps |= MMC_CAP_NONREMOVABLE;
197 }
198
199
200 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
201 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
202
203 if (pdata->quirks)
204 host->quirks |= pdata->quirks;
205 if (pdata->host_caps)
206 host->mmc->caps |= pdata->host_caps;
207 if (pdata->pm_caps)
208 host->mmc->pm_caps |= pdata->pm_caps;
209 }
210
211 host->ops = &pxav2_sdhci_ops;
212
213 ret = sdhci_add_host(host);
214 if (ret)
215 goto disable_clk;
216
217 return 0;
218
219disable_clk:
220 clk_disable_unprepare(clk);
221free:
222 sdhci_pltfm_free(pdev);
223 return ret;
224}
225
226static struct platform_driver sdhci_pxav2_driver = {
227 .driver = {
228 .name = "sdhci-pxav2",
229 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
230 .of_match_table = of_match_ptr(sdhci_pxav2_of_match),
231 .pm = &sdhci_pltfm_pmops,
232 },
233 .probe = sdhci_pxav2_probe,
234 .remove = sdhci_pltfm_unregister,
235};
236
237module_platform_driver(sdhci_pxav2_driver);
238
239MODULE_DESCRIPTION("SDHCI driver for pxav2");
240MODULE_AUTHOR("Marvell International Ltd.");
241MODULE_LICENSE("GPL v2");
242
243
