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1/*
2 * Copyright (c) 2014 Oleksij Rempel <linux@rempel-privat.de>.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include <linux/clk.h>
18#include <linux/clkdev.h>
19#include <linux/err.h>
20#include <linux/io.h>
21#include <linux/clk-provider.h>
22#include <linux/spinlock.h>
23#include <linux/of.h>
24#include <linux/of_address.h>
25#include <dt-bindings/clock/alphascale,asm9260.h>
26
27#define HW_AHBCLKCTRL0 0x0020
28#define HW_AHBCLKCTRL1 0x0030
29#define HW_SYSPLLCTRL 0x0100
30#define HW_MAINCLKSEL 0x0120
31#define HW_MAINCLKUEN 0x0124
32#define HW_UARTCLKSEL 0x0128
33#define HW_UARTCLKUEN 0x012c
34#define HW_I2S0CLKSEL 0x0130
35#define HW_I2S0CLKUEN 0x0134
36#define HW_I2S1CLKSEL 0x0138
37#define HW_I2S1CLKUEN 0x013c
38#define HW_WDTCLKSEL 0x0160
39#define HW_WDTCLKUEN 0x0164
40#define HW_CLKOUTCLKSEL 0x0170
41#define HW_CLKOUTCLKUEN 0x0174
42#define HW_CPUCLKDIV 0x017c
43#define HW_SYSAHBCLKDIV 0x0180
44#define HW_I2S0MCLKDIV 0x0190
45#define HW_I2S0SCLKDIV 0x0194
46#define HW_I2S1MCLKDIV 0x0188
47#define HW_I2S1SCLKDIV 0x018c
48#define HW_UART0CLKDIV 0x0198
49#define HW_UART1CLKDIV 0x019c
50#define HW_UART2CLKDIV 0x01a0
51#define HW_UART3CLKDIV 0x01a4
52#define HW_UART4CLKDIV 0x01a8
53#define HW_UART5CLKDIV 0x01ac
54#define HW_UART6CLKDIV 0x01b0
55#define HW_UART7CLKDIV 0x01b4
56#define HW_UART8CLKDIV 0x01b8
57#define HW_UART9CLKDIV 0x01bc
58#define HW_SPI0CLKDIV 0x01c0
59#define HW_SPI1CLKDIV 0x01c4
60#define HW_QUADSPICLKDIV 0x01c8
61#define HW_SSP0CLKDIV 0x01d0
62#define HW_NANDCLKDIV 0x01d4
63#define HW_TRACECLKDIV 0x01e0
64#define HW_CAMMCLKDIV 0x01e8
65#define HW_WDTCLKDIV 0x01ec
66#define HW_CLKOUTCLKDIV 0x01f4
67#define HW_MACCLKDIV 0x01f8
68#define HW_LCDCLKDIV 0x01fc
69#define HW_ADCANACLKDIV 0x0200
70
71static struct clk_hw_onecell_data *clk_data;
72static DEFINE_SPINLOCK(asm9260_clk_lock);
73
74struct asm9260_div_clk {
75 unsigned int idx;
76 const char *name;
77 const char *parent_name;
78 u32 reg;
79};
80
81struct asm9260_gate_data {
82 unsigned int idx;
83 const char *name;
84 const char *parent_name;
85 u32 reg;
86 u8 bit_idx;
87 unsigned long flags;
88};
89
90struct asm9260_mux_clock {
91 u8 mask;
92 u32 *table;
93 const char *name;
94 const char **parent_names;
95 u8 num_parents;
96 unsigned long offset;
97 unsigned long flags;
98};
99
100static void __iomem *base;
101
102static const struct asm9260_div_clk asm9260_div_clks[] __initconst = {
103 { CLKID_SYS_CPU, "cpu_div", "main_gate", HW_CPUCLKDIV },
104 { CLKID_SYS_AHB, "ahb_div", "cpu_div", HW_SYSAHBCLKDIV },
105
106 /* i2s has two deviders: one for only external mclk and internal
107 * devider for all clks. */
108 { CLKID_SYS_I2S0M, "i2s0m_div", "i2s0_mclk", HW_I2S0MCLKDIV },
109 { CLKID_SYS_I2S1M, "i2s1m_div", "i2s1_mclk", HW_I2S1MCLKDIV },
110 { CLKID_SYS_I2S0S, "i2s0s_div", "i2s0_gate", HW_I2S0SCLKDIV },
111 { CLKID_SYS_I2S1S, "i2s1s_div", "i2s0_gate", HW_I2S1SCLKDIV },
112
113 { CLKID_SYS_UART0, "uart0_div", "uart_gate", HW_UART0CLKDIV },
114 { CLKID_SYS_UART1, "uart1_div", "uart_gate", HW_UART1CLKDIV },
115 { CLKID_SYS_UART2, "uart2_div", "uart_gate", HW_UART2CLKDIV },
116 { CLKID_SYS_UART3, "uart3_div", "uart_gate", HW_UART3CLKDIV },
117 { CLKID_SYS_UART4, "uart4_div", "uart_gate", HW_UART4CLKDIV },
118 { CLKID_SYS_UART5, "uart5_div", "uart_gate", HW_UART5CLKDIV },
119 { CLKID_SYS_UART6, "uart6_div", "uart_gate", HW_UART6CLKDIV },
120 { CLKID_SYS_UART7, "uart7_div", "uart_gate", HW_UART7CLKDIV },
121 { CLKID_SYS_UART8, "uart8_div", "uart_gate", HW_UART8CLKDIV },
122 { CLKID_SYS_UART9, "uart9_div", "uart_gate", HW_UART9CLKDIV },
123
124 { CLKID_SYS_SPI0, "spi0_div", "main_gate", HW_SPI0CLKDIV },
125 { CLKID_SYS_SPI1, "spi1_div", "main_gate", HW_SPI1CLKDIV },
126 { CLKID_SYS_QUADSPI, "quadspi_div", "main_gate", HW_QUADSPICLKDIV },
127 { CLKID_SYS_SSP0, "ssp0_div", "main_gate", HW_SSP0CLKDIV },
128 { CLKID_SYS_NAND, "nand_div", "main_gate", HW_NANDCLKDIV },
129 { CLKID_SYS_TRACE, "trace_div", "main_gate", HW_TRACECLKDIV },
130 { CLKID_SYS_CAMM, "camm_div", "main_gate", HW_CAMMCLKDIV },
131 { CLKID_SYS_MAC, "mac_div", "main_gate", HW_MACCLKDIV },
132 { CLKID_SYS_LCD, "lcd_div", "main_gate", HW_LCDCLKDIV },
133 { CLKID_SYS_ADCANA, "adcana_div", "main_gate", HW_ADCANACLKDIV },
134
135 { CLKID_SYS_WDT, "wdt_div", "wdt_gate", HW_WDTCLKDIV },
136 { CLKID_SYS_CLKOUT, "clkout_div", "clkout_gate", HW_CLKOUTCLKDIV },
137};
138
139static const struct asm9260_gate_data asm9260_mux_gates[] __initconst = {
140 { 0, "main_gate", "main_mux", HW_MAINCLKUEN, 0 },
141 { 0, "uart_gate", "uart_mux", HW_UARTCLKUEN, 0 },
142 { 0, "i2s0_gate", "i2s0_mux", HW_I2S0CLKUEN, 0 },
143 { 0, "i2s1_gate", "i2s1_mux", HW_I2S1CLKUEN, 0 },
144 { 0, "wdt_gate", "wdt_mux", HW_WDTCLKUEN, 0 },
145 { 0, "clkout_gate", "clkout_mux", HW_CLKOUTCLKUEN, 0 },
146};
147static const struct asm9260_gate_data asm9260_ahb_gates[] __initconst = {
148 /* ahb gates */
149 { CLKID_AHB_ROM, "rom", "ahb_div",
150 HW_AHBCLKCTRL0, 1, CLK_IGNORE_UNUSED},
151 { CLKID_AHB_RAM, "ram", "ahb_div",
152 HW_AHBCLKCTRL0, 2, CLK_IGNORE_UNUSED},
153 { CLKID_AHB_GPIO, "gpio", "ahb_div",
154 HW_AHBCLKCTRL0, 4 },
155 { CLKID_AHB_MAC, "mac", "ahb_div",
156 HW_AHBCLKCTRL0, 5 },
157 { CLKID_AHB_EMI, "emi", "ahb_div",
158 HW_AHBCLKCTRL0, 6, CLK_IGNORE_UNUSED},
159 { CLKID_AHB_USB0, "usb0", "ahb_div",
160 HW_AHBCLKCTRL0, 7 },
161 { CLKID_AHB_USB1, "usb1", "ahb_div",
162 HW_AHBCLKCTRL0, 8 },
163 { CLKID_AHB_DMA0, "dma0", "ahb_div",
164 HW_AHBCLKCTRL0, 9 },
165 { CLKID_AHB_DMA1, "dma1", "ahb_div",
166 HW_AHBCLKCTRL0, 10 },
167 { CLKID_AHB_UART0, "uart0", "ahb_div",
168 HW_AHBCLKCTRL0, 11 },
169 { CLKID_AHB_UART1, "uart1", "ahb_div",
170 HW_AHBCLKCTRL0, 12 },
171 { CLKID_AHB_UART2, "uart2", "ahb_div",
172 HW_AHBCLKCTRL0, 13 },
173 { CLKID_AHB_UART3, "uart3", "ahb_div",
174 HW_AHBCLKCTRL0, 14 },
175 { CLKID_AHB_UART4, "uart4", "ahb_div",
176 HW_AHBCLKCTRL0, 15 },
177 { CLKID_AHB_UART5, "uart5", "ahb_div",
178 HW_AHBCLKCTRL0, 16 },
179 { CLKID_AHB_UART6, "uart6", "ahb_div",
180 HW_AHBCLKCTRL0, 17 },
181 { CLKID_AHB_UART7, "uart7", "ahb_div",
182 HW_AHBCLKCTRL0, 18 },
183 { CLKID_AHB_UART8, "uart8", "ahb_div",
184 HW_AHBCLKCTRL0, 19 },
185 { CLKID_AHB_UART9, "uart9", "ahb_div",
186 HW_AHBCLKCTRL0, 20 },
187 { CLKID_AHB_I2S0, "i2s0", "ahb_div",
188 HW_AHBCLKCTRL0, 21 },
189 { CLKID_AHB_I2C0, "i2c0", "ahb_div",
190 HW_AHBCLKCTRL0, 22 },
191 { CLKID_AHB_I2C1, "i2c1", "ahb_div",
192 HW_AHBCLKCTRL0, 23 },
193 { CLKID_AHB_SSP0, "ssp0", "ahb_div",
194 HW_AHBCLKCTRL0, 24 },
195 { CLKID_AHB_IOCONFIG, "ioconf", "ahb_div",
196 HW_AHBCLKCTRL0, 25 },
197 { CLKID_AHB_WDT, "wdt", "ahb_div",
198 HW_AHBCLKCTRL0, 26 },
199 { CLKID_AHB_CAN0, "can0", "ahb_div",
200 HW_AHBCLKCTRL0, 27 },
201 { CLKID_AHB_CAN1, "can1", "ahb_div",
202 HW_AHBCLKCTRL0, 28 },
203 { CLKID_AHB_MPWM, "mpwm", "ahb_div",
204 HW_AHBCLKCTRL0, 29 },
205 { CLKID_AHB_SPI0, "spi0", "ahb_div",
206 HW_AHBCLKCTRL0, 30 },
207 { CLKID_AHB_SPI1, "spi1", "ahb_div",
208 HW_AHBCLKCTRL0, 31 },
209
210 { CLKID_AHB_QEI, "qei", "ahb_div",
211 HW_AHBCLKCTRL1, 0 },
212 { CLKID_AHB_QUADSPI0, "quadspi0", "ahb_div",
213 HW_AHBCLKCTRL1, 1 },
214 { CLKID_AHB_CAMIF, "capmif", "ahb_div",
215 HW_AHBCLKCTRL1, 2 },
216 { CLKID_AHB_LCDIF, "lcdif", "ahb_div",
217 HW_AHBCLKCTRL1, 3 },
218 { CLKID_AHB_TIMER0, "timer0", "ahb_div",
219 HW_AHBCLKCTRL1, 4 },
220 { CLKID_AHB_TIMER1, "timer1", "ahb_div",
221 HW_AHBCLKCTRL1, 5 },
222 { CLKID_AHB_TIMER2, "timer2", "ahb_div",
223 HW_AHBCLKCTRL1, 6 },
224 { CLKID_AHB_TIMER3, "timer3", "ahb_div",
225 HW_AHBCLKCTRL1, 7 },
226 { CLKID_AHB_IRQ, "irq", "ahb_div",
227 HW_AHBCLKCTRL1, 8, CLK_IGNORE_UNUSED},
228 { CLKID_AHB_RTC, "rtc", "ahb_div",
229 HW_AHBCLKCTRL1, 9 },
230 { CLKID_AHB_NAND, "nand", "ahb_div",
231 HW_AHBCLKCTRL1, 10 },
232 { CLKID_AHB_ADC0, "adc0", "ahb_div",
233 HW_AHBCLKCTRL1, 11 },
234 { CLKID_AHB_LED, "led", "ahb_div",
235 HW_AHBCLKCTRL1, 12 },
236 { CLKID_AHB_DAC0, "dac0", "ahb_div",
237 HW_AHBCLKCTRL1, 13 },
238 { CLKID_AHB_LCD, "lcd", "ahb_div",
239 HW_AHBCLKCTRL1, 14 },
240 { CLKID_AHB_I2S1, "i2s1", "ahb_div",
241 HW_AHBCLKCTRL1, 15 },
242 { CLKID_AHB_MAC1, "mac1", "ahb_div",
243 HW_AHBCLKCTRL1, 16 },
244};
245
246static const char __initdata *main_mux_p[] = { NULL, NULL };
247static const char __initdata *i2s0_mux_p[] = { NULL, NULL, "i2s0m_div"};
248static const char __initdata *i2s1_mux_p[] = { NULL, NULL, "i2s1m_div"};
249static const char __initdata *clkout_mux_p[] = { NULL, NULL, "rtc"};
250static u32 three_mux_table[] = {0, 1, 3};
251
252static struct asm9260_mux_clock asm9260_mux_clks[] __initdata = {
253 { 1, three_mux_table, "main_mux", main_mux_p,
254 ARRAY_SIZE(main_mux_p), HW_MAINCLKSEL, },
255 { 1, three_mux_table, "uart_mux", main_mux_p,
256 ARRAY_SIZE(main_mux_p), HW_UARTCLKSEL, },
257 { 1, three_mux_table, "wdt_mux", main_mux_p,
258 ARRAY_SIZE(main_mux_p), HW_WDTCLKSEL, },
259 { 3, three_mux_table, "i2s0_mux", i2s0_mux_p,
260 ARRAY_SIZE(i2s0_mux_p), HW_I2S0CLKSEL, },
261 { 3, three_mux_table, "i2s1_mux", i2s1_mux_p,
262 ARRAY_SIZE(i2s1_mux_p), HW_I2S1CLKSEL, },
263 { 3, three_mux_table, "clkout_mux", clkout_mux_p,
264 ARRAY_SIZE(clkout_mux_p), HW_CLKOUTCLKSEL, },
265};
266
267static void __init asm9260_acc_init(struct device_node *np)
268{
269 struct clk_hw *hw;
270 struct clk_hw **hws;
271 const char *ref_clk, *pll_clk = "pll";
272 u32 rate;
273 int n;
274 u32 accuracy = 0;
275
276 clk_data = kzalloc(sizeof(*clk_data) +
277 sizeof(*clk_data->hws) * MAX_CLKS, GFP_KERNEL);
278 if (!clk_data)
279 return;
280 clk_data->num = MAX_CLKS;
281 hws = clk_data->hws;
282
283 base = of_io_request_and_map(np, 0, np->name);
284 if (IS_ERR(base))
285 panic("%s: unable to map resource", np->name);
286
287 /* register pll */
288 rate = (ioread32(base + HW_SYSPLLCTRL) & 0xffff) * 1000000;
289
290 ref_clk = of_clk_get_parent_name(np, 0);
291 accuracy = clk_get_accuracy(__clk_lookup(ref_clk));
292 hw = clk_hw_register_fixed_rate_with_accuracy(NULL, pll_clk,
293 ref_clk, 0, rate, accuracy);
294
295 if (IS_ERR(hw))
296 panic("%s: can't register REFCLK. Check DT!", np->name);
297
298 for (n = 0; n < ARRAY_SIZE(asm9260_mux_clks); n++) {
299 const struct asm9260_mux_clock *mc = &asm9260_mux_clks[n];
300
301 mc->parent_names[0] = ref_clk;
302 mc->parent_names[1] = pll_clk;
303 hw = clk_hw_register_mux_table(NULL, mc->name, mc->parent_names,
304 mc->num_parents, mc->flags, base + mc->offset,
305 0, mc->mask, 0, mc->table, &asm9260_clk_lock);
306 }
307
308 /* clock mux gate cells */
309 for (n = 0; n < ARRAY_SIZE(asm9260_mux_gates); n++) {
310 const struct asm9260_gate_data *gd = &asm9260_mux_gates[n];
311
312 hw = clk_hw_register_gate(NULL, gd->name,
313 gd->parent_name, gd->flags | CLK_SET_RATE_PARENT,
314 base + gd->reg, gd->bit_idx, 0, &asm9260_clk_lock);
315 }
316
317 /* clock div cells */
318 for (n = 0; n < ARRAY_SIZE(asm9260_div_clks); n++) {
319 const struct asm9260_div_clk *dc = &asm9260_div_clks[n];
320
321 hws[dc->idx] = clk_hw_register_divider(NULL, dc->name,
322 dc->parent_name, CLK_SET_RATE_PARENT,
323 base + dc->reg, 0, 8, CLK_DIVIDER_ONE_BASED,
324 &asm9260_clk_lock);
325 }
326
327 /* clock ahb gate cells */
328 for (n = 0; n < ARRAY_SIZE(asm9260_ahb_gates); n++) {
329 const struct asm9260_gate_data *gd = &asm9260_ahb_gates[n];
330
331 hws[gd->idx] = clk_hw_register_gate(NULL, gd->name,
332 gd->parent_name, gd->flags, base + gd->reg,
333 gd->bit_idx, 0, &asm9260_clk_lock);
334 }
335
336 /* check for errors on leaf clocks */
337 for (n = 0; n < MAX_CLKS; n++) {
338 if (!IS_ERR(hws[n]))
339 continue;
340
341 pr_err("%s: Unable to register leaf clock %d\n",
342 np->full_name, n);
343 goto fail;
344 }
345
346 /* register clk-provider */
347 of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_data);
348 return;
349fail:
350 iounmap(base);
351}
352CLK_OF_DECLARE(asm9260_acc, "alphascale,asm9260-clock-controller",
353 asm9260_acc_init);