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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_set_private_registers(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 if (mask == SDHCI_RESET_ALL) {
60 u16 tmp = 0;
61
62
63
64
65
66 if (pdata && pdata->clk_delay_sel == 1) {
67 tmp = readw(host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
68
69 tmp &= ~(SDCLK_DELAY_MASK << SDCLK_DELAY_SHIFT);
70 tmp |= (pdata->clk_delay_cycles & SDCLK_DELAY_MASK)
71 << SDCLK_DELAY_SHIFT;
72 tmp &= ~(SDCLK_SEL_MASK << SDCLK_SEL_SHIFT);
73 tmp |= (1 & SDCLK_SEL_MASK) << SDCLK_SEL_SHIFT;
74
75 writew(tmp, host->ioaddr + SD_CLOCK_BURST_SIZE_SETUP);
76 }
77
78 if (pdata && (pdata->flags & PXA_FLAG_ENABLE_CLOCK_GATING)) {
79 tmp = readw(host->ioaddr + SD_FIFO_PARAM);
80 tmp &= ~CLK_GATE_SETTING_BITS;
81 writew(tmp, host->ioaddr + SD_FIFO_PARAM);
82 } else {
83 tmp = readw(host->ioaddr + SD_FIFO_PARAM);
84 tmp &= ~CLK_GATE_SETTING_BITS;
85 tmp |= CLK_GATE_SETTING_BITS;
86 writew(tmp, host->ioaddr + SD_FIFO_PARAM);
87 }
88 }
89}
90
91static int pxav2_mmc_set_width(struct sdhci_host *host, int width)
92{
93 u8 ctrl;
94 u16 tmp;
95
96 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
97 tmp = readw(host->ioaddr + SD_CE_ATA_2);
98 if (width == MMC_BUS_WIDTH_8) {
99 ctrl &= ~SDHCI_CTRL_4BITBUS;
100 tmp |= MMC_CARD | MMC_WIDTH;
101 } else {
102 tmp &= ~(MMC_CARD | MMC_WIDTH);
103 if (width == MMC_BUS_WIDTH_4)
104 ctrl |= SDHCI_CTRL_4BITBUS;
105 else
106 ctrl &= ~SDHCI_CTRL_4BITBUS;
107 }
108 writew(tmp, host->ioaddr + SD_CE_ATA_2);
109 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
110
111 return 0;
112}
113
114static const struct sdhci_ops pxav2_sdhci_ops = {
115 .get_max_clock = sdhci_pltfm_clk_get_max_clock,
116 .platform_reset_exit = pxav2_set_private_registers,
117 .platform_bus_width = pxav2_mmc_set_width,
118};
119
120#ifdef CONFIG_OF
121static const struct of_device_id sdhci_pxav2_of_match[] = {
122 {
123 .compatible = "mrvl,pxav2-mmc",
124 },
125 {},
126};
127MODULE_DEVICE_TABLE(of, sdhci_pxav2_of_match);
128
129static struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
130{
131 struct sdhci_pxa_platdata *pdata;
132 struct device_node *np = dev->of_node;
133 u32 bus_width;
134 u32 clk_delay_cycles;
135
136 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
137 if (!pdata)
138 return NULL;
139
140 if (of_find_property(np, "non-removable", NULL))
141 pdata->flags |= PXA_FLAG_CARD_PERMANENT;
142
143 of_property_read_u32(np, "bus-width", &bus_width);
144 if (bus_width == 8)
145 pdata->flags |= PXA_FLAG_SD_8_BIT_CAPABLE_SLOT;
146
147 of_property_read_u32(np, "mrvl,clk-delay-cycles", &clk_delay_cycles);
148 if (clk_delay_cycles > 0) {
149 pdata->clk_delay_sel = 1;
150 pdata->clk_delay_cycles = clk_delay_cycles;
151 }
152
153 return pdata;
154}
155#else
156static inline struct sdhci_pxa_platdata *pxav2_get_mmc_pdata(struct device *dev)
157{
158 return NULL;
159}
160#endif
161
162static int sdhci_pxav2_probe(struct platform_device *pdev)
163{
164 struct sdhci_pltfm_host *pltfm_host;
165 struct sdhci_pxa_platdata *pdata = pdev->dev.platform_data;
166 struct device *dev = &pdev->dev;
167 struct sdhci_host *host = NULL;
168 struct sdhci_pxa *pxa = NULL;
169 const struct of_device_id *match;
170
171 int ret;
172 struct clk *clk;
173
174 pxa = kzalloc(sizeof(struct sdhci_pxa), GFP_KERNEL);
175 if (!pxa)
176 return -ENOMEM;
177
178 host = sdhci_pltfm_init(pdev, NULL, 0);
179 if (IS_ERR(host)) {
180 kfree(pxa);
181 return PTR_ERR(host);
182 }
183 pltfm_host = sdhci_priv(host);
184 pltfm_host->priv = pxa;
185
186 clk = clk_get(dev, "PXA-SDHCLK");
187 if (IS_ERR(clk)) {
188 dev_err(dev, "failed to get io clock\n");
189 ret = PTR_ERR(clk);
190 goto err_clk_get;
191 }
192 pltfm_host->clk = clk;
193 clk_prepare_enable(clk);
194
195 host->quirks = SDHCI_QUIRK_BROKEN_ADMA
196 | SDHCI_QUIRK_BROKEN_TIMEOUT_VAL
197 | SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN;
198
199 match = of_match_device(of_match_ptr(sdhci_pxav2_of_match), &pdev->dev);
200 if (match) {
201 pdata = pxav2_get_mmc_pdata(dev);
202 }
203 if (pdata) {
204 if (pdata->flags & PXA_FLAG_CARD_PERMANENT) {
205
206 host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION;
207 host->mmc->caps |= MMC_CAP_NONREMOVABLE;
208 }
209
210
211 if (pdata->flags & PXA_FLAG_SD_8_BIT_CAPABLE_SLOT)
212 host->mmc->caps |= MMC_CAP_8_BIT_DATA;
213
214 if (pdata->quirks)
215 host->quirks |= pdata->quirks;
216 if (pdata->host_caps)
217 host->mmc->caps |= pdata->host_caps;
218 if (pdata->pm_caps)
219 host->mmc->pm_caps |= pdata->pm_caps;
220 }
221
222 host->ops = &pxav2_sdhci_ops;
223
224 ret = sdhci_add_host(host);
225 if (ret) {
226 dev_err(&pdev->dev, "failed to add host\n");
227 goto err_add_host;
228 }
229
230 platform_set_drvdata(pdev, host);
231
232 return 0;
233
234err_add_host:
235 clk_disable_unprepare(clk);
236 clk_put(clk);
237err_clk_get:
238 sdhci_pltfm_free(pdev);
239 kfree(pxa);
240 return ret;
241}
242
243static int sdhci_pxav2_remove(struct platform_device *pdev)
244{
245 struct sdhci_host *host = platform_get_drvdata(pdev);
246 struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
247 struct sdhci_pxa *pxa = pltfm_host->priv;
248
249 sdhci_remove_host(host, 1);
250
251 clk_disable_unprepare(pltfm_host->clk);
252 clk_put(pltfm_host->clk);
253 sdhci_pltfm_free(pdev);
254 kfree(pxa);
255
256 return 0;
257}
258
259static struct platform_driver sdhci_pxav2_driver = {
260 .driver = {
261 .name = "sdhci-pxav2",
262 .owner = THIS_MODULE,
263#ifdef CONFIG_OF
264 .of_match_table = sdhci_pxav2_of_match,
265#endif
266 .pm = SDHCI_PLTFM_PMOPS,
267 },
268 .probe = sdhci_pxav2_probe,
269 .remove = sdhci_pxav2_remove,
270};
271
272module_platform_driver(sdhci_pxav2_driver);
273
274MODULE_DESCRIPTION("SDHCI driver for pxav2");
275MODULE_AUTHOR("Marvell International Ltd.");
276MODULE_LICENSE("GPL v2");
277
278
