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20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/platform_device.h>
23#include <linux/clk.h>
24#include <linux/module.h>
25#include <linux/io.h>
26#include <linux/gpio.h>
27#include <linux/mmc/card.h>
28#include <linux/mmc/host.h>
29#include <linux/platform_data/pxa_sdhci.h>
30#include <linux/slab.h>
31#include <linux/of.h>
32#include <linux/of_device.h>
33
34#include "sdhci.h"
35#include "sdhci-pltfm.h"
36
37#define SD_FIFO_PARAM 0xe0
38#define DIS_PAD_SD_CLK_GATE 0x0400
39#define CLK_GATE_ON 0x0200
40#define CLK_GATE_CTL 0x0100
41#define CLK_GATE_SETTING_BITS (DIS_PAD_SD_CLK_GATE | \
42 CLK_GATE_ON | CLK_GATE_CTL)
43
44#define SD_CLOCK_BURST_SIZE_SETUP 0xe6
45#define SDCLK_SEL_SHIFT 8
46#define SDCLK_SEL_MASK 0x3
47#define SDCLK_DELAY_SHIFT 10
48#define SDCLK_DELAY_MASK 0x3c
49
50#define SD_CE_ATA_2 0xea
51#define MMC_CARD 0x1000
52#define MMC_WIDTH 0x0100
53
54static void pxav2_reset(struct sdhci_host *host, u8 mask)
55{
56 struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
57 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
58
59 sdhci_reset(host, mask);
60
61 if (mask == SDHCI_RESET_ALL) {
62 u16 tmp = 0;
63
64
65
66
67
68 if (pdata && pdata->clk_delay_sel == 1) {
69 tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
70
71 tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT);
72 tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
73 << SDCLK_DELAY_SHIFT;
74 tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT);
75 tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT;
76
77 writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
78 }
79
80 if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) {
81 tmp = readw(host->ioaddr + SD_FIFO_PARAM);
82 tmp &= ~CLK_GATE_SETTING_BITS;
83 writew(tmp, host->ioaddr + SD_FIFO_PARAM);
84 } else {
85 tmp = readw(host->ioaddr + SD_FIFO_PARAM);
86 tmp &= ~CLK_GATE_SETTING_BITS;
87 tmp |= CLK_GATE_SETTING_BITS;
88 writew(tmp, host->ioaddr + SD_FIFO_PARAM);
89 }
90 }
91}
92
93static void pxav2_mmc_set_bus_width(struct sdhci_host *host, int width)
94{
95 u8 ctrl;
96 u16 tmp;
97
98 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
99 tmp = readw(host->ioaddr + SD_CE_ATA_2);
100 if (width == MMC_BUS_WIDTH_8) {
101 ctrl &= ~SDHCI_CTRL_4BITBUS;
102 tmp |= MMC_CARD | MMC_WIDTH;
103 } else {
104 tmp &= ~(MMC_CARD | MMC_WIDTH);
105 if (width == MMC_BUS_WIDTH_4)
106 ctrl |= SDHCI_CTRL_4BITBUS;
107 else
108 ctrl &= ~SDHCI_CTRL_4BITBUS;
109 }
110 writew(tmp, host->ioaddr + SD_CE_ATA_2);
111 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
112}
113
114static const struct sdhci_ops pxav2_sdhci_ops = {
115 .set_clock = sdhci_set_clock,
116 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
117 .set_bus_width = pxav2_mmc_set_bus_width,
118 .reset = pxav2_reset,
119 .set_uhs_signaling = sdhci_set_uhs_signaling,
120};
121
122#ifdef CONFIG_OF
123static const struct of_device_id sdhci_pxav2_of_match[] = {
124 {
125 .compatible = "mrvl,pxav2-mmc",
126 },
127 {},
128};
129MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match);
130
131static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
132{
133 struct sdhci_pxa_platdata *pdata;
134 struct device_node *np = dev->of_node;
135 u32 bus_width;
136 u32 clk_delay_cycles;
137
138 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
139 if (!pdata)
140 return NULL;
141
142 if (of_find_property(np, "non-removable", NULL))
143 pdata->flags |= PXA_FLAG_CARD_PERMANENT;
144
145 of_property_read_u32(np, "bus-width", &bus_width);
146 if (bus_width == 8)
147 pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT;
148
149 of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
150 if (clk_delay_cycles > 0) {
151 pdata->clk_delay_sel = 1;
152 pdata->clk_delay_cycles = clk_delay_cycles;
153 }
154
155 return pdata;
156}
157#else
158static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
159{
160 return NULL;
161}
162#endif
163
164static int sdhci_pxav2_probe(struct platform_device *pdev)
165{
166 struct sdhci_pltfm_host *pltfm_host;
167 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
168 struct device *dev = &pdev->dev;
169 struct sdhci_host *host = NULL;
170 struct sdhci_pxa *pxa = NULL;
171 const struct of_device_id *match;
172
173 int ret;
174 struct clk *clk;
175
176 pxa = kzalloc(sizeof(struct sdhci_pxa), GFP_KERNEL);
177 if (!pxa)
178 return -ENOMEM;
179
180 host = sdhci_pltfm_init(pdev, NULL, 0);
181 if (IS_ERR(host)) {
182 kfree(pxa);
183 return PTR_ERR(host);
184 }
185 pltfm_host = sdhci_priv(host);
186 pltfm_host->priv = pxa;
187
188 clk = clk_get(dev, "PXA-SDHCLK");
189 if (IS_ERR(clk)) {
190 dev_err(dev, "failed to get io clock\n");
191 ret = PTR_ERR(clk);
192 goto err_clk_get;
193 }
194 pltfm_host->clk = clk;
195 clk_prepare_enable(clk);
196
197 host->quirks = SDHCI_QUIRK_BROKEN_ADMA
198 | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
199 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
200
201 match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev);
202 if (match) {
203 pdata = pxav2_get_mmc_pdata(dev);
204 }
205 if (pdata) {
206 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {
207
208 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
209 host->mmc->caps |= MMC_CAP_NONREMOVABLE;
210 }
211
212
213 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
214 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
215
216 if (pdata->quirks)
217 host->quirks |= pdata->quirks;
218 if (pdata->host_caps)
219 host->mmc->caps |= pdata->host_caps;
220 if (pdata->pm_caps)
221 host->mmc->pm_caps |= pdata->pm_caps;
222 }
223
224 host->ops = &pxav2_sdhci_ops;
225
226 ret = sdhci_add_host(host);
227 if (ret) {
228 dev_err(&pdev->dev, "failed to add host\n");
229 goto err_add_host;
230 }
231
232 platform_set_drvdata(pdev, host);
233
234 return 0;
235
236err_add_host:
237 clk_disable_unprepare(clk);
238 clk_put(clk);
239err_clk_get:
240 sdhci_pltfm_free(pdev);
241 kfree(pxa);
242 return ret;
243}
244
245static int sdhci_pxav2_remove(struct platform_device *pdev)
246{
247 struct sdhci_host *host = platform_get_drvdata(pdev);
248 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
249 struct sdhci_pxa *pxa = pltfm_host->priv;
250
251 sdhci_remove_host(host, 1);
252
253 clk_disable_unprepare(pltfm_host->clk);
254 clk_put(pltfm_host->clk);
255 sdhci_pltfm_free(pdev);
256 kfree(pxa);
257
258 return 0;
259}
260
261static struct platform_driver sdhci_pxav2_driver = {
262 .driver = {
263 .name = "sdhci-pxav2",
264#ifdef CONFIG_OF
265 .of_match_table = sdhci_pxav2_of_match,
266#endif
267 .pm = SDHCI_PLTFM_PMOPS,
268 },
269 .probe = sdhci_pxav2_probe,
270 .remove = sdhci_pxav2_remove,
271};
272
273module_platform_driver(sdhci_pxav2_driver);
274
275MODULE_DESCRIPTION("SDHCI driver for pxav2");
276MODULE_AUTHOR("Marvell International Ltd.");
277MODULE_LICENSE("GPL v2");
278
279
