This source file includes following definitions.
- da850_sata_init
- ahci_da850_calculate_mpy
- ahci_da850_softreset
- ahci_da850_hardreset
- ahci_da850_probe
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6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/pm.h>
9 #include <linux/device.h>
10 #include <linux/platform_device.h>
11 #include <linux/libata.h>
12 #include <linux/ahci_platform.h>
13 #include "ahci.h"
14
15 #define DRV_NAME "ahci_da850"
16 #define HARDRESET_RETRIES 5
17
18
19 #define SATA_P0PHYCR_REG 0x178
20
21 #define SATA_PHY_MPY(x) ((x) << 0)
22 #define SATA_PHY_LOS(x) ((x) << 6)
23 #define SATA_PHY_RXCDR(x) ((x) << 10)
24 #define SATA_PHY_RXEQ(x) ((x) << 13)
25 #define SATA_PHY_TXSWING(x) ((x) << 19)
26 #define SATA_PHY_ENPLL(x) ((x) << 31)
27
28 static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg,
29 void __iomem *ahci_base, u32 mpy)
30 {
31 unsigned int val;
32
33
34 val = readl(pwrdn_reg);
35 val &= ~BIT(0);
36 writel(val, pwrdn_reg);
37
38 val = SATA_PHY_MPY(mpy) | SATA_PHY_LOS(1) | SATA_PHY_RXCDR(4) |
39 SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) | SATA_PHY_ENPLL(1);
40
41 writel(val, ahci_base + SATA_P0PHYCR_REG);
42 }
43
44 static u32 ahci_da850_calculate_mpy(unsigned long refclk_rate)
45 {
46 u32 pll_output = 1500000000, needed;
47
48
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54
55
56 WARN((refclk_rate % 10) != 0, "refclk must be divisible by 10");
57 needed = pll_output / (refclk_rate / 10);
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59
60
61
62
63
64
65 switch (needed) {
66 case 50:
67 return 0x1;
68 case 60:
69 return 0x2;
70 case 80:
71 return 0x4;
72 case 100:
73 return 0x5;
74 case 120:
75 return 0x6;
76 case 125:
77 return 0x7;
78 case 150:
79 return 0x8;
80 case 200:
81 return 0x9;
82 case 250:
83 return 0xa;
84 default:
85
86
87
88
89 return 0;
90 }
91 }
92
93 static int ahci_da850_softreset(struct ata_link *link,
94 unsigned int *class, unsigned long deadline)
95 {
96 int pmp, ret;
97
98 pmp = sata_srst_pmp(link);
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106
107 ret = ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready);
108 if (pmp && ret == -EBUSY)
109 return ahci_do_softreset(link, class, 0,
110 deadline, ahci_check_ready);
111
112 return ret;
113 }
114
115 static int ahci_da850_hardreset(struct ata_link *link,
116 unsigned int *class, unsigned long deadline)
117 {
118 int ret, retry = HARDRESET_RETRIES;
119 bool online;
120
121
122
123
124
125
126
127
128
129 do {
130 ret = ahci_do_hardreset(link, class, deadline, &online);
131 if (online)
132 return ret;
133 } while (retry--);
134
135 return ret;
136 }
137
138 static struct ata_port_operations ahci_da850_port_ops = {
139 .inherits = &ahci_platform_ops,
140 .softreset = ahci_da850_softreset,
141
142
143
144
145 .hardreset = ahci_da850_hardreset,
146 .pmp_hardreset = ahci_da850_hardreset,
147 };
148
149 static const struct ata_port_info ahci_da850_port_info = {
150 .flags = AHCI_FLAG_COMMON,
151 .pio_mask = ATA_PIO4,
152 .udma_mask = ATA_UDMA6,
153 .port_ops = &ahci_da850_port_ops,
154 };
155
156 static struct scsi_host_template ahci_platform_sht = {
157 AHCI_SHT(DRV_NAME),
158 };
159
160 static int ahci_da850_probe(struct platform_device *pdev)
161 {
162 struct device *dev = &pdev->dev;
163 struct ahci_host_priv *hpriv;
164 void __iomem *pwrdn_reg;
165 struct resource *res;
166 struct clk *clk;
167 u32 mpy;
168 int rc;
169
170 hpriv = ahci_platform_get_resources(pdev, 0);
171 if (IS_ERR(hpriv))
172 return PTR_ERR(hpriv);
173
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177
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179
180
181 if (!hpriv->clks[0]) {
182 clk = clk_get(dev, "fck");
183 if (IS_ERR(clk))
184 return PTR_ERR(clk);
185
186 hpriv->clks[0] = clk;
187 }
188
189
190
191
192
193
194 if (!hpriv->clks[1]) {
195 clk = clk_get(dev, "refclk");
196 if (IS_ERR(clk)) {
197 dev_err(dev, "unable to obtain the reference clock");
198 return -ENODEV;
199 }
200
201 hpriv->clks[1] = clk;
202 }
203
204 mpy = ahci_da850_calculate_mpy(clk_get_rate(hpriv->clks[1]));
205 if (mpy == 0) {
206 dev_err(dev, "invalid REFCLK multiplier value: 0x%x", mpy);
207 return -EINVAL;
208 }
209
210 rc = ahci_platform_enable_resources(hpriv);
211 if (rc)
212 return rc;
213
214 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
215 if (!res) {
216 rc = -ENODEV;
217 goto disable_resources;
218 }
219
220 pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
221 if (!pwrdn_reg) {
222 rc = -ENOMEM;
223 goto disable_resources;
224 }
225
226 da850_sata_init(dev, pwrdn_reg, hpriv->mmio, mpy);
227
228 rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info,
229 &ahci_platform_sht);
230 if (rc)
231 goto disable_resources;
232
233 return 0;
234 disable_resources:
235 ahci_platform_disable_resources(hpriv);
236 return rc;
237 }
238
239 static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend,
240 ahci_platform_resume);
241
242 static const struct of_device_id ahci_da850_of_match[] = {
243 { .compatible = "ti,da850-ahci", },
244 { },
245 };
246 MODULE_DEVICE_TABLE(of, ahci_da850_of_match);
247
248 static struct platform_driver ahci_da850_driver = {
249 .probe = ahci_da850_probe,
250 .remove = ata_platform_remove_one,
251 .driver = {
252 .name = DRV_NAME,
253 .of_match_table = ahci_da850_of_match,
254 .pm = &ahci_da850_pm_ops,
255 },
256 };
257 module_platform_driver(ahci_da850_driver);
258
259 MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver");
260 MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>");
261 MODULE_LICENSE("GPL");