1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2014 Oleksij Rempel <linux@rempel-privat.de>.
4 */
5
6 #include <linux/clk.h>
7 #include <linux/clkdev.h>
8 #include <linux/err.h>
9 #include <linux/io.h>
10 #include <linux/clk-provider.h>
11 #include <linux/spinlock.h>
12 #include <linux/of.h>
13 #include <linux/of_address.h>
14 #include <dt-bindings/clock/alphascale,asm9260.h>
15
16 #define HW_AHBCLKCTRL0 0x0020
17 #define HW_AHBCLKCTRL1 0x0030
18 #define HW_SYSPLLCTRL 0x0100
19 #define HW_MAINCLKSEL 0x0120
20 #define HW_MAINCLKUEN 0x0124
21 #define HW_UARTCLKSEL 0x0128
22 #define HW_UARTCLKUEN 0x012c
23 #define HW_I2S0CLKSEL 0x0130
24 #define HW_I2S0CLKUEN 0x0134
25 #define HW_I2S1CLKSEL 0x0138
26 #define HW_I2S1CLKUEN 0x013c
27 #define HW_WDTCLKSEL 0x0160
28 #define HW_WDTCLKUEN 0x0164
29 #define HW_CLKOUTCLKSEL 0x0170
30 #define HW_CLKOUTCLKUEN 0x0174
31 #define HW_CPUCLKDIV 0x017c
32 #define HW_SYSAHBCLKDIV 0x0180
33 #define HW_I2S0MCLKDIV 0x0190
34 #define HW_I2S0SCLKDIV 0x0194
35 #define HW_I2S1MCLKDIV 0x0188
36 #define HW_I2S1SCLKDIV 0x018c
37 #define HW_UART0CLKDIV 0x0198
38 #define HW_UART1CLKDIV 0x019c
39 #define HW_UART2CLKDIV 0x01a0
40 #define HW_UART3CLKDIV 0x01a4
41 #define HW_UART4CLKDIV 0x01a8
42 #define HW_UART5CLKDIV 0x01ac
43 #define HW_UART6CLKDIV 0x01b0
44 #define HW_UART7CLKDIV 0x01b4
45 #define HW_UART8CLKDIV 0x01b8
46 #define HW_UART9CLKDIV 0x01bc
47 #define HW_SPI0CLKDIV 0x01c0
48 #define HW_SPI1CLKDIV 0x01c4
49 #define HW_QUADSPICLKDIV 0x01c8
50 #define HW_SSP0CLKDIV 0x01d0
51 #define HW_NANDCLKDIV 0x01d4
52 #define HW_TRACECLKDIV 0x01e0
53 #define HW_CAMMCLKDIV 0x01e8
54 #define HW_WDTCLKDIV 0x01ec
55 #define HW_CLKOUTCLKDIV 0x01f4
56 #define HW_MACCLKDIV 0x01f8
57 #define HW_LCDCLKDIV 0x01fc
58 #define HW_ADCANACLKDIV 0x0200
59
60 static struct clk_hw_onecell_data *clk_data;
61 static DEFINE_SPINLOCK(asm9260_clk_lock);
62
63 struct asm9260_div_clk {
64 unsigned int idx;
65 const char *name;
66 const char *parent_name;
67 u32 reg;
68 };
69
70 struct asm9260_gate_data {
71 unsigned int idx;
72 const char *name;
73 const char *parent_name;
74 u32 reg;
75 u8 bit_idx;
76 unsigned long flags;
77 };
78
79 struct asm9260_mux_clock {
80 u8 mask;
81 u32 *table;
82 const char *name;
83 const struct clk_parent_data *parent_data;
84 u8 num_parents;
85 unsigned long offset;
86 unsigned long flags;
87 };
88
89 static void __iomem *base;
90
91 static const struct asm9260_div_clk asm9260_div_clks[] __initconst = {
92 { CLKID_SYS_CPU, "cpu_div", "main_gate", HW_CPUCLKDIV },
93 { CLKID_SYS_AHB, "ahb_div", "cpu_div", HW_SYSAHBCLKDIV },
94
95 /* i2s has two deviders: one for only external mclk and internal
96 * devider for all clks. */
97 { CLKID_SYS_I2S0M, "i2s0m_div", "i2s0_mclk", HW_I2S0MCLKDIV },
98 { CLKID_SYS_I2S1M, "i2s1m_div", "i2s1_mclk", HW_I2S1MCLKDIV },
99 { CLKID_SYS_I2S0S, "i2s0s_div", "i2s0_gate", HW_I2S0SCLKDIV },
100 { CLKID_SYS_I2S1S, "i2s1s_div", "i2s0_gate", HW_I2S1SCLKDIV },
101
102 { CLKID_SYS_UART0, "uart0_div", "uart_gate", HW_UART0CLKDIV },
103 { CLKID_SYS_UART1, "uart1_div", "uart_gate", HW_UART1CLKDIV },
104 { CLKID_SYS_UART2, "uart2_div", "uart_gate", HW_UART2CLKDIV },
105 { CLKID_SYS_UART3, "uart3_div", "uart_gate", HW_UART3CLKDIV },
106 { CLKID_SYS_UART4, "uart4_div", "uart_gate", HW_UART4CLKDIV },
107 { CLKID_SYS_UART5, "uart5_div", "uart_gate", HW_UART5CLKDIV },
108 { CLKID_SYS_UART6, "uart6_div", "uart_gate", HW_UART6CLKDIV },
109 { CLKID_SYS_UART7, "uart7_div", "uart_gate", HW_UART7CLKDIV },
110 { CLKID_SYS_UART8, "uart8_div", "uart_gate", HW_UART8CLKDIV },
111 { CLKID_SYS_UART9, "uart9_div", "uart_gate", HW_UART9CLKDIV },
112
113 { CLKID_SYS_SPI0, "spi0_div", "main_gate", HW_SPI0CLKDIV },
114 { CLKID_SYS_SPI1, "spi1_div", "main_gate", HW_SPI1CLKDIV },
115 { CLKID_SYS_QUADSPI, "quadspi_div", "main_gate", HW_QUADSPICLKDIV },
116 { CLKID_SYS_SSP0, "ssp0_div", "main_gate", HW_SSP0CLKDIV },
117 { CLKID_SYS_NAND, "nand_div", "main_gate", HW_NANDCLKDIV },
118 { CLKID_SYS_TRACE, "trace_div", "main_gate", HW_TRACECLKDIV },
119 { CLKID_SYS_CAMM, "camm_div", "main_gate", HW_CAMMCLKDIV },
120 { CLKID_SYS_MAC, "mac_div", "main_gate", HW_MACCLKDIV },
121 { CLKID_SYS_LCD, "lcd_div", "main_gate", HW_LCDCLKDIV },
122 { CLKID_SYS_ADCANA, "adcana_div", "main_gate", HW_ADCANACLKDIV },
123
124 { CLKID_SYS_WDT, "wdt_div", "wdt_gate", HW_WDTCLKDIV },
125 { CLKID_SYS_CLKOUT, "clkout_div", "clkout_gate", HW_CLKOUTCLKDIV },
126 };
127
128 static const struct asm9260_gate_data asm9260_mux_gates[] __initconst = {
129 { 0, "main_gate", "main_mux", HW_MAINCLKUEN, 0 },
130 { 0, "uart_gate", "uart_mux", HW_UARTCLKUEN, 0 },
131 { 0, "i2s0_gate", "i2s0_mux", HW_I2S0CLKUEN, 0 },
132 { 0, "i2s1_gate", "i2s1_mux", HW_I2S1CLKUEN, 0 },
133 { 0, "wdt_gate", "wdt_mux", HW_WDTCLKUEN, 0 },
134 { 0, "clkout_gate", "clkout_mux", HW_CLKOUTCLKUEN, 0 },
135 };
136 static const struct asm9260_gate_data asm9260_ahb_gates[] __initconst = {
137 /* ahb gates */
138 { CLKID_AHB_ROM, "rom", "ahb_div",
139 HW_AHBCLKCTRL0, 1, CLK_IGNORE_UNUSED},
140 { CLKID_AHB_RAM, "ram", "ahb_div",
141 HW_AHBCLKCTRL0, 2, CLK_IGNORE_UNUSED},
142 { CLKID_AHB_GPIO, "gpio", "ahb_div",
143 HW_AHBCLKCTRL0, 4 },
144 { CLKID_AHB_MAC, "mac", "ahb_div",
145 HW_AHBCLKCTRL0, 5 },
146 { CLKID_AHB_EMI, "emi", "ahb_div",
147 HW_AHBCLKCTRL0, 6, CLK_IGNORE_UNUSED},
148 { CLKID_AHB_USB0, "usb0", "ahb_div",
149 HW_AHBCLKCTRL0, 7 },
150 { CLKID_AHB_USB1, "usb1", "ahb_div",
151 HW_AHBCLKCTRL0, 8 },
152 { CLKID_AHB_DMA0, "dma0", "ahb_div",
153 HW_AHBCLKCTRL0, 9 },
154 { CLKID_AHB_DMA1, "dma1", "ahb_div",
155 HW_AHBCLKCTRL0, 10 },
156 { CLKID_AHB_UART0, "uart0", "ahb_div",
157 HW_AHBCLKCTRL0, 11 },
158 { CLKID_AHB_UART1, "uart1", "ahb_div",
159 HW_AHBCLKCTRL0, 12 },
160 { CLKID_AHB_UART2, "uart2", "ahb_div",
161 HW_AHBCLKCTRL0, 13 },
162 { CLKID_AHB_UART3, "uart3", "ahb_div",
163 HW_AHBCLKCTRL0, 14 },
164 { CLKID_AHB_UART4, "uart4", "ahb_div",
165 HW_AHBCLKCTRL0, 15 },
166 { CLKID_AHB_UART5, "uart5", "ahb_div",
167 HW_AHBCLKCTRL0, 16 },
168 { CLKID_AHB_UART6, "uart6", "ahb_div",
169 HW_AHBCLKCTRL0, 17 },
170 { CLKID_AHB_UART7, "uart7", "ahb_div",
171 HW_AHBCLKCTRL0, 18 },
172 { CLKID_AHB_UART8, "uart8", "ahb_div",
173 HW_AHBCLKCTRL0, 19 },
174 { CLKID_AHB_UART9, "uart9", "ahb_div",
175 HW_AHBCLKCTRL0, 20 },
176 { CLKID_AHB_I2S0, "i2s0", "ahb_div",
177 HW_AHBCLKCTRL0, 21 },
178 { CLKID_AHB_I2C0, "i2c0", "ahb_div",
179 HW_AHBCLKCTRL0, 22 },
180 { CLKID_AHB_I2C1, "i2c1", "ahb_div",
181 HW_AHBCLKCTRL0, 23 },
182 { CLKID_AHB_SSP0, "ssp0", "ahb_div",
183 HW_AHBCLKCTRL0, 24 },
184 { CLKID_AHB_IOCONFIG, "ioconf", "ahb_div",
185 HW_AHBCLKCTRL0, 25 },
186 { CLKID_AHB_WDT, "wdt", "ahb_div",
187 HW_AHBCLKCTRL0, 26 },
188 { CLKID_AHB_CAN0, "can0", "ahb_div",
189 HW_AHBCLKCTRL0, 27 },
190 { CLKID_AHB_CAN1, "can1", "ahb_div",
191 HW_AHBCLKCTRL0, 28 },
192 { CLKID_AHB_MPWM, "mpwm", "ahb_div",
193 HW_AHBCLKCTRL0, 29 },
194 { CLKID_AHB_SPI0, "spi0", "ahb_div",
195 HW_AHBCLKCTRL0, 30 },
196 { CLKID_AHB_SPI1, "spi1", "ahb_div",
197 HW_AHBCLKCTRL0, 31 },
198
199 { CLKID_AHB_QEI, "qei", "ahb_div",
200 HW_AHBCLKCTRL1, 0 },
201 { CLKID_AHB_QUADSPI0, "quadspi0", "ahb_div",
202 HW_AHBCLKCTRL1, 1 },
203 { CLKID_AHB_CAMIF, "capmif", "ahb_div",
204 HW_AHBCLKCTRL1, 2 },
205 { CLKID_AHB_LCDIF, "lcdif", "ahb_div",
206 HW_AHBCLKCTRL1, 3 },
207 { CLKID_AHB_TIMER0, "timer0", "ahb_div",
208 HW_AHBCLKCTRL1, 4 },
209 { CLKID_AHB_TIMER1, "timer1", "ahb_div",
210 HW_AHBCLKCTRL1, 5 },
211 { CLKID_AHB_TIMER2, "timer2", "ahb_div",
212 HW_AHBCLKCTRL1, 6 },
213 { CLKID_AHB_TIMER3, "timer3", "ahb_div",
214 HW_AHBCLKCTRL1, 7 },
215 { CLKID_AHB_IRQ, "irq", "ahb_div",
216 HW_AHBCLKCTRL1, 8, CLK_IGNORE_UNUSED},
217 { CLKID_AHB_RTC, "rtc", "ahb_div",
218 HW_AHBCLKCTRL1, 9 },
219 { CLKID_AHB_NAND, "nand", "ahb_div",
220 HW_AHBCLKCTRL1, 10 },
221 { CLKID_AHB_ADC0, "adc0", "ahb_div",
222 HW_AHBCLKCTRL1, 11 },
223 { CLKID_AHB_LED, "led", "ahb_div",
224 HW_AHBCLKCTRL1, 12 },
225 { CLKID_AHB_DAC0, "dac0", "ahb_div",
226 HW_AHBCLKCTRL1, 13 },
227 { CLKID_AHB_LCD, "lcd", "ahb_div",
228 HW_AHBCLKCTRL1, 14 },
229 { CLKID_AHB_I2S1, "i2s1", "ahb_div",
230 HW_AHBCLKCTRL1, 15 },
231 { CLKID_AHB_MAC1, "mac1", "ahb_div",
232 HW_AHBCLKCTRL1, 16 },
233 };
234
235 static struct clk_parent_data __initdata main_mux_p[] = { { .index = 0, }, { .name = "pll" } };
236 static struct clk_parent_data __initdata i2s0_mux_p[] = { { .index = 0, }, { .name = "pll" }, { .name = "i2s0m_div"} };
237 static struct clk_parent_data __initdata i2s1_mux_p[] = { { .index = 0, }, { .name = "pll" }, { .name = "i2s1m_div"} };
238 static struct clk_parent_data __initdata clkout_mux_p[] = { { .index = 0, }, { .name = "pll" }, { .name = "rtc"} };
239 static u32 three_mux_table[] = {0, 1, 3};
240
241 static struct asm9260_mux_clock asm9260_mux_clks[] __initdata = {
242 { 1, three_mux_table, "main_mux", main_mux_p,
243 ARRAY_SIZE(main_mux_p), HW_MAINCLKSEL, },
244 { 1, three_mux_table, "uart_mux", main_mux_p,
245 ARRAY_SIZE(main_mux_p), HW_UARTCLKSEL, },
246 { 1, three_mux_table, "wdt_mux", main_mux_p,
247 ARRAY_SIZE(main_mux_p), HW_WDTCLKSEL, },
248 { 3, three_mux_table, "i2s0_mux", i2s0_mux_p,
249 ARRAY_SIZE(i2s0_mux_p), HW_I2S0CLKSEL, },
250 { 3, three_mux_table, "i2s1_mux", i2s1_mux_p,
251 ARRAY_SIZE(i2s1_mux_p), HW_I2S1CLKSEL, },
252 { 3, three_mux_table, "clkout_mux", clkout_mux_p,
253 ARRAY_SIZE(clkout_mux_p), HW_CLKOUTCLKSEL, },
254 };
255
asm9260_acc_init(struct device_node * np)256 static void __init asm9260_acc_init(struct device_node *np)
257 {
258 struct clk_hw *hw, *pll_hw;
259 struct clk_hw **hws;
260 const char *pll_clk = "pll";
261 struct clk_parent_data pll_parent_data = { .index = 0 };
262 u32 rate;
263 int n;
264
265 clk_data = kzalloc(struct_size(clk_data, hws, MAX_CLKS), GFP_KERNEL);
266 if (!clk_data)
267 return;
268 clk_data->num = MAX_CLKS;
269 hws = clk_data->hws;
270
271 base = of_io_request_and_map(np, 0, np->name);
272 if (IS_ERR(base))
273 panic("%pOFn: unable to map resource", np);
274
275 /* register pll */
276 rate = (ioread32(base + HW_SYSPLLCTRL) & 0xffff) * 1000000;
277
278 pll_hw = clk_hw_register_fixed_rate_parent_accuracy(NULL, pll_clk, &pll_parent_data,
279 0, rate);
280 if (IS_ERR(pll_hw))
281 panic("%pOFn: can't register REFCLK. Check DT!", np);
282
283 for (n = 0; n < ARRAY_SIZE(asm9260_mux_clks); n++) {
284 const struct asm9260_mux_clock *mc = &asm9260_mux_clks[n];
285
286 hw = clk_hw_register_mux_table_parent_data(NULL, mc->name, mc->parent_data,
287 mc->num_parents, mc->flags, base + mc->offset,
288 0, mc->mask, 0, mc->table, &asm9260_clk_lock);
289 }
290
291 /* clock mux gate cells */
292 for (n = 0; n < ARRAY_SIZE(asm9260_mux_gates); n++) {
293 const struct asm9260_gate_data *gd = &asm9260_mux_gates[n];
294
295 hw = clk_hw_register_gate(NULL, gd->name,
296 gd->parent_name, gd->flags | CLK_SET_RATE_PARENT,
297 base + gd->reg, gd->bit_idx, 0, &asm9260_clk_lock);
298 }
299
300 /* clock div cells */
301 for (n = 0; n < ARRAY_SIZE(asm9260_div_clks); n++) {
302 const struct asm9260_div_clk *dc = &asm9260_div_clks[n];
303
304 hws[dc->idx] = clk_hw_register_divider(NULL, dc->name,
305 dc->parent_name, CLK_SET_RATE_PARENT,
306 base + dc->reg, 0, 8, CLK_DIVIDER_ONE_BASED,
307 &asm9260_clk_lock);
308 }
309
310 /* clock ahb gate cells */
311 for (n = 0; n < ARRAY_SIZE(asm9260_ahb_gates); n++) {
312 const struct asm9260_gate_data *gd = &asm9260_ahb_gates[n];
313
314 hws[gd->idx] = clk_hw_register_gate(NULL, gd->name,
315 gd->parent_name, gd->flags, base + gd->reg,
316 gd->bit_idx, 0, &asm9260_clk_lock);
317 }
318
319 /* check for errors on leaf clocks */
320 for (n = 0; n < MAX_CLKS; n++) {
321 if (!IS_ERR(hws[n]))
322 continue;
323
324 pr_err("%pOF: Unable to register leaf clock %d\n",
325 np, n);
326 goto fail;
327 }
328
329 /* register clk-provider */
330 of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_data);
331 return;
332 fail:
333 iounmap(base);
334 }
335 CLK_OF_DECLARE(asm9260_acc, "alphascale,asm9260-clock-controller",
336 asm9260_acc_init);
337