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18#include <linux/slab.h>
19#include <linux/clk-provider.h>
20#include <linux/io.h>
21#include <linux/mfd/syscon.h>
22#include <linux/of.h>
23#include <linux/regmap.h>
24
25#include "clk.h"
26
27#define SOCFPGA_L4_MP_CLK "l4_mp_clk"
28#define SOCFPGA_L4_SP_CLK "l4_sp_clk"
29#define SOCFPGA_NAND_CLK "nand_clk"
30#define SOCFPGA_NAND_X_CLK "nand_x_clk"
31#define SOCFPGA_MMC_CLK "sdmmc_clk"
32#define SOCFPGA_GPIO_DB_CLK_OFFSET 0xA8
33
34#define to_socfpga_gate_clk(p) container_of(p, struct socfpga_gate_clk, hw.hw)
35
36
37#define SYSMGR_SDMMCGRP_CTRL_OFFSET 0x108
38
39static u8 socfpga_clk_get_parent(struct clk_hw *hwclk)
40{
41 u32 l4_src;
42 u32 perpll_src;
43
44 if (streq(hwclk->init->name, SOCFPGA_L4_MP_CLK)) {
45 l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
46 return l4_src &= 0x1;
47 }
48 if (streq(hwclk->init->name, SOCFPGA_L4_SP_CLK)) {
49 l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
50 return !!(l4_src & 2);
51 }
52
53 perpll_src = readl(clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
54 if (streq(hwclk->init->name, SOCFPGA_MMC_CLK))
55 return perpll_src &= 0x3;
56 if (streq(hwclk->init->name, SOCFPGA_NAND_CLK) ||
57 streq(hwclk->init->name, SOCFPGA_NAND_X_CLK))
58 return (perpll_src >> 2) & 3;
59
60
61 return (perpll_src >> 4) & 3;
62
63}
64
65static int socfpga_clk_set_parent(struct clk_hw *hwclk, u8 parent)
66{
67 u32 src_reg;
68
69 if (streq(hwclk->init->name, SOCFPGA_L4_MP_CLK)) {
70 src_reg = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
71 src_reg &= ~0x1;
72 src_reg |= parent;
73 writel(src_reg, clk_mgr_base_addr + CLKMGR_L4SRC);
74 } else if (streq(hwclk->init->name, SOCFPGA_L4_SP_CLK)) {
75 src_reg = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
76 src_reg &= ~0x2;
77 src_reg |= (parent << 1);
78 writel(src_reg, clk_mgr_base_addr + CLKMGR_L4SRC);
79 } else {
80 src_reg = readl(clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
81 if (streq(hwclk->init->name, SOCFPGA_MMC_CLK)) {
82 src_reg &= ~0x3;
83 src_reg |= parent;
84 } else if (streq(hwclk->init->name, SOCFPGA_NAND_CLK) ||
85 streq(hwclk->init->name, SOCFPGA_NAND_X_CLK)) {
86 src_reg &= ~0xC;
87 src_reg |= (parent << 2);
88 } else {
89 src_reg &= ~0x30;
90 src_reg |= (parent << 4);
91 }
92 writel(src_reg, clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
93 }
94
95 return 0;
96}
97
98static unsigned long socfpga_clk_recalc_rate(struct clk_hw *hwclk,
99 unsigned long parent_rate)
100{
101 struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
102 u32 div = 1, val;
103
104 if (socfpgaclk->fixed_div)
105 div = socfpgaclk->fixed_div;
106 else if (socfpgaclk->div_reg) {
107 val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
108 val &= GENMASK(socfpgaclk->width - 1, 0);
109
110 if ((int) socfpgaclk->div_reg & SOCFPGA_GPIO_DB_CLK_OFFSET)
111 div = val + 1;
112 else
113 div = (1 << val);
114 }
115
116 return parent_rate / div;
117}
118
119static int socfpga_clk_prepare(struct clk_hw *hwclk)
120{
121 struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
122 struct regmap *sys_mgr_base_addr;
123 int i;
124 u32 hs_timing;
125 u32 clk_phase[2];
126
127 if (socfpgaclk->clk_phase[0] || socfpgaclk->clk_phase[1]) {
128 sys_mgr_base_addr = syscon_regmap_lookup_by_compatible("altr,sys-mgr");
129 if (IS_ERR(sys_mgr_base_addr)) {
130 pr_err("%s: failed to find altr,sys-mgr regmap!\n", __func__);
131 return -EINVAL;
132 }
133
134 for (i = 0; i < 2; i++) {
135 switch (socfpgaclk->clk_phase[i]) {
136 case 0:
137 clk_phase[i] = 0;
138 break;
139 case 45:
140 clk_phase[i] = 1;
141 break;
142 case 90:
143 clk_phase[i] = 2;
144 break;
145 case 135:
146 clk_phase[i] = 3;
147 break;
148 case 180:
149 clk_phase[i] = 4;
150 break;
151 case 225:
152 clk_phase[i] = 5;
153 break;
154 case 270:
155 clk_phase[i] = 6;
156 break;
157 case 315:
158 clk_phase[i] = 7;
159 break;
160 default:
161 clk_phase[i] = 0;
162 break;
163 }
164 }
165 hs_timing = SYSMGR_SDMMC_CTRL_SET(clk_phase[0], clk_phase[1]);
166 regmap_write(sys_mgr_base_addr, SYSMGR_SDMMCGRP_CTRL_OFFSET,
167 hs_timing);
168 }
169 return 0;
170}
171
172static struct clk_ops gateclk_ops = {
173 .prepare = socfpga_clk_prepare,
174 .recalc_rate = socfpga_clk_recalc_rate,
175 .get_parent = socfpga_clk_get_parent,
176 .set_parent = socfpga_clk_set_parent,
177};
178
179static void __init __socfpga_gate_init(struct device_node *node,
180 const struct clk_ops *ops)
181{
182 u32 clk_gate[2];
183 u32 div_reg[3];
184 u32 clk_phase[2];
185 u32 fixed_div;
186 struct clk *clk;
187 struct socfpga_gate_clk *socfpga_clk;
188 const char *clk_name = node->name;
189 const char *parent_name[SOCFPGA_MAX_PARENTS];
190 struct clk_init_data init;
191 int rc;
192
193 socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL);
194 if (WARN_ON(!socfpga_clk))
195 return;
196
197 rc = of_property_read_u32_array(node, "clk-gate", clk_gate, 2);
198 if (rc)
199 clk_gate[0] = 0;
200
201 if (clk_gate[0]) {
202 socfpga_clk->hw.reg = clk_mgr_base_addr + clk_gate[0];
203 socfpga_clk->hw.bit_idx = clk_gate[1];
204
205 gateclk_ops.enable = clk_gate_ops.enable;
206 gateclk_ops.disable = clk_gate_ops.disable;
207 }
208
209 rc = of_property_read_u32(node, "fixed-divider", &fixed_div);
210 if (rc)
211 socfpga_clk->fixed_div = 0;
212 else
213 socfpga_clk->fixed_div = fixed_div;
214
215 rc = of_property_read_u32_array(node, "div-reg", div_reg, 3);
216 if (!rc) {
217 socfpga_clk->div_reg = clk_mgr_base_addr + div_reg[0];
218 socfpga_clk->shift = div_reg[1];
219 socfpga_clk->width = div_reg[2];
220 } else {
221 socfpga_clk->div_reg = NULL;
222 }
223
224 rc = of_property_read_u32_array(node, "clk-phase", clk_phase, 2);
225 if (!rc) {
226 socfpga_clk->clk_phase[0] = clk_phase[0];
227 socfpga_clk->clk_phase[1] = clk_phase[1];
228 }
229
230 of_property_read_string(node, "clock-output-names", &clk_name);
231
232 init.name = clk_name;
233 init.ops = ops;
234 init.flags = 0;
235
236 init.num_parents = of_clk_parent_fill(node, parent_name, SOCFPGA_MAX_PARENTS);
237 init.parent_names = parent_name;
238 socfpga_clk->hw.hw.init = &init;
239
240 clk = clk_register(NULL, &socfpga_clk->hw.hw);
241 if (WARN_ON(IS_ERR(clk))) {
242 kfree(socfpga_clk);
243 return;
244 }
245 rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
246 if (WARN_ON(rc))
247 return;
248}
249
250void __init socfpga_gate_init(struct device_node *node)
251{
252 __socfpga_gate_init(node, &gateclk_ops);
253}
254
