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17#include <linux/device.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/io.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/of.h>
24#include <linux/phy/phy.h>
25#include <linux/platform_device.h>
26
27#define SATA_MDIO_BANK_OFFSET 0x23c
28#define SATA_MDIO_REG_OFFSET(ofs) ((ofs) * 4)
29
30#define MAX_PORTS 2
31
32
33#define SATA_MDIO_REG_28NM_SPACE_SIZE 0x1000
34
35
36
37
38#define SATA_MDIO_REG_40NM_SPACE_SIZE 0x10
39
40enum brcm_sata_phy_version {
41 BRCM_SATA_PHY_28NM,
42 BRCM_SATA_PHY_40NM,
43};
44
45struct brcm_sata_port {
46 int portnum;
47 struct phy *phy;
48 struct brcm_sata_phy *phy_priv;
49 bool ssc_en;
50};
51
52struct brcm_sata_phy {
53 struct device *dev;
54 void __iomem *phy_base;
55 enum brcm_sata_phy_version version;
56
57 struct brcm_sata_port phys[MAX_PORTS];
58};
59
60enum sata_mdio_phy_regs {
61 PLL_REG_BANK_0 = 0x50,
62 PLL_REG_BANK_0_PLLCONTROL_0 = 0x81,
63
64 TXPMD_REG_BANK = 0x1a0,
65 TXPMD_CONTROL1 = 0x81,
66 TXPMD_CONTROL1_TX_SSC_EN_FRC = BIT(0),
67 TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL = BIT(1),
68 TXPMD_TX_FREQ_CTRL_CONTROL1 = 0x82,
69 TXPMD_TX_FREQ_CTRL_CONTROL2 = 0x83,
70 TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK = 0x3ff,
71 TXPMD_TX_FREQ_CTRL_CONTROL3 = 0x84,
72 TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK = 0x3ff,
73};
74
75static inline void __iomem *brcm_sata_phy_base(struct brcm_sata_port *port)
76{
77 struct brcm_sata_phy *priv = port->phy_priv;
78 u32 offset = 0;
79
80 if (priv->version == BRCM_SATA_PHY_28NM)
81 offset = SATA_MDIO_REG_28NM_SPACE_SIZE;
82 else if (priv->version == BRCM_SATA_PHY_40NM)
83 offset = SATA_MDIO_REG_40NM_SPACE_SIZE;
84 else
85 dev_err(priv->dev, "invalid phy version\n");
86
87 return priv->phy_base + (port->portnum * offset);
88}
89
90static void brcm_sata_mdio_wr(void __iomem *addr, u32 bank, u32 ofs,
91 u32 msk, u32 value)
92{
93 u32 tmp;
94
95 writel(bank, addr + SATA_MDIO_BANK_OFFSET);
96 tmp = readl(addr + SATA_MDIO_REG_OFFSET(ofs));
97 tmp = (tmp & msk) | value;
98 writel(tmp, addr + SATA_MDIO_REG_OFFSET(ofs));
99}
100
101
102#define FMIN_VAL_DEFAULT 0x3df
103#define FMAX_VAL_DEFAULT 0x3df
104#define FMAX_VAL_SSC 0x83
105
106static void brcm_sata_cfg_ssc(struct brcm_sata_port *port)
107{
108 void __iomem *base = brcm_sata_phy_base(port);
109 struct brcm_sata_phy *priv = port->phy_priv;
110 u32 tmp;
111
112
113 tmp = TXPMD_CONTROL1_TX_SSC_EN_FRC_VAL | TXPMD_CONTROL1_TX_SSC_EN_FRC;
114 brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_CONTROL1, ~tmp, tmp);
115
116
117 brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL2,
118 ~TXPMD_TX_FREQ_CTRL_CONTROL2_FMIN_MASK,
119 FMIN_VAL_DEFAULT);
120
121
122 if (port->ssc_en) {
123 dev_info(priv->dev, "enabling SSC on port %d\n", port->portnum);
124 tmp = FMAX_VAL_SSC;
125 } else {
126 tmp = FMAX_VAL_DEFAULT;
127 }
128
129 brcm_sata_mdio_wr(base, TXPMD_REG_BANK, TXPMD_TX_FREQ_CTRL_CONTROL3,
130 ~TXPMD_TX_FREQ_CTRL_CONTROL3_FMAX_MASK, tmp);
131}
132
133static int brcm_sata_phy_init(struct phy *phy)
134{
135 struct brcm_sata_port *port = phy_get_drvdata(phy);
136
137 brcm_sata_cfg_ssc(port);
138
139 return 0;
140}
141
142static const struct phy_ops phy_ops = {
143 .init = brcm_sata_phy_init,
144 .owner = THIS_MODULE,
145};
146
147static const struct of_device_id brcm_sata_phy_of_match[] = {
148 { .compatible = "brcm,bcm7445-sata-phy",
149 .data = (void *)BRCM_SATA_PHY_28NM },
150 { .compatible = "brcm,bcm7425-sata-phy",
151 .data = (void *)BRCM_SATA_PHY_40NM },
152 {},
153};
154MODULE_DEVICE_TABLE(of, brcm_sata_phy_of_match);
155
156static int brcm_sata_phy_probe(struct platform_device *pdev)
157{
158 struct device *dev = &pdev->dev;
159 struct device_node *dn = dev->of_node, *child;
160 const struct of_device_id *of_id;
161 struct brcm_sata_phy *priv;
162 struct resource *res;
163 struct phy_provider *provider;
164 int ret, count = 0;
165
166 if (of_get_child_count(dn) == 0)
167 return -ENODEV;
168
169 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
170 if (!priv)
171 return -ENOMEM;
172 dev_set_drvdata(dev, priv);
173 priv->dev = dev;
174
175 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
176 priv->phy_base = devm_ioremap_resource(dev, res);
177 if (IS_ERR(priv->phy_base))
178 return PTR_ERR(priv->phy_base);
179
180 of_id = of_match_node(brcm_sata_phy_of_match, dn);
181 if (of_id)
182 priv->version = (enum brcm_sata_phy_version)of_id->data;
183 else
184 priv->version = BRCM_SATA_PHY_28NM;
185
186 for_each_available_child_of_node(dn, child) {
187 unsigned int id;
188 struct brcm_sata_port *port;
189
190 if (of_property_read_u32(child, "reg", &id)) {
191 dev_err(dev, "missing reg property in node %s\n",
192 child->name);
193 ret = -EINVAL;
194 goto put_child;
195 }
196
197 if (id >= MAX_PORTS) {
198 dev_err(dev, "invalid reg: %u\n", id);
199 ret = -EINVAL;
200 goto put_child;
201 }
202 if (priv->phys[id].phy) {
203 dev_err(dev, "already registered port %u\n", id);
204 ret = -EINVAL;
205 goto put_child;
206 }
207
208 port = &priv->phys[id];
209 port->portnum = id;
210 port->phy_priv = priv;
211 port->phy = devm_phy_create(dev, child, &phy_ops);
212 port->ssc_en = of_property_read_bool(child, "brcm,enable-ssc");
213 if (IS_ERR(port->phy)) {
214 dev_err(dev, "failed to create PHY\n");
215 ret = PTR_ERR(port->phy);
216 goto put_child;
217 }
218
219 phy_set_drvdata(port->phy, port);
220 count++;
221 }
222
223 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
224 if (IS_ERR(provider)) {
225 dev_err(dev, "could not register PHY provider\n");
226 return PTR_ERR(provider);
227 }
228
229 dev_info(dev, "registered %d port(s)\n", count);
230
231 return 0;
232put_child:
233 of_node_put(child);
234 return ret;
235}
236
237static struct platform_driver brcm_sata_phy_driver = {
238 .probe = brcm_sata_phy_probe,
239 .driver = {
240 .of_match_table = brcm_sata_phy_of_match,
241 .name = "brcmstb-sata-phy",
242 }
243};
244module_platform_driver(brcm_sata_phy_driver);
245
246MODULE_DESCRIPTION("Broadcom STB SATA PHY driver");
247MODULE_LICENSE("GPL");
248MODULE_AUTHOR("Marc Carino");
249MODULE_AUTHOR("Brian Norris");
250MODULE_ALIAS("platform:phy-brcmstb-sata");
251
