1 // SPDX-License-Identifier: GPL-2.0-only
3 * Marvell PXA3xxx family clocks
5 * Copyright (C) 2014 Robert Jarzmik
7 * Heavily inspired from former arch/arm/mach-pxa/pxa3xx.c
9 * For non-devicetree platforms. Once pxa is fully converted to devicetree, this
13 #include <linux/clk.h>
14 #include <linux/clk-provider.h>
15 #include <linux/clkdev.h>
17 #include <linux/soc/pxa/cpu.h>
18 #include <linux/soc/pxa/smemc.h>
19 #include <linux/clk/pxa.h>
21 #include <dt-bindings/clock/pxa-clock.h>
25 #define MHz (1000 * 1000)
27 #define ACCR (0x0000) /* Application Subsystem Clock Configuration Register */
28 #define ACSR (0x0004) /* Application Subsystem Clock Status Register */
29 #define AICSR (0x0008) /* Application Subsystem Interrupt Control/Status Register */
30 #define CKENA (0x000C) /* A Clock Enable Register */
31 #define CKENB (0x0010) /* B Clock Enable Register */
32 #define CKENC (0x0024) /* C Clock Enable Register */
33 #define AC97_DIV (0x0014) /* AC97 clock divisor value register */
35 #define ACCR_XPDIS (1 << 31) /* Core PLL Output Disable */
36 #define ACCR_SPDIS (1 << 30) /* System PLL Output Disable */
37 #define ACCR_D0CS (1 << 26) /* D0 Mode Clock Select */
38 #define ACCR_PCCE (1 << 11) /* Power Mode Change Clock Enable */
39 #define ACCR_DDR_D0CS (1 << 7) /* DDR SDRAM clock frequency in D0CS (PXA31x only) */
41 #define ACCR_SMCFS_MASK (0x7 << 23) /* Static Memory Controller Frequency Select */
42 #define ACCR_SFLFS_MASK (0x3 << 18) /* Frequency Select for Internal Memory Controller */
43 #define ACCR_XSPCLK_MASK (0x3 << 16) /* Core Frequency during Frequency Change */
44 #define ACCR_HSS_MASK (0x3 << 14) /* System Bus-Clock Frequency Select */
45 #define ACCR_DMCFS_MASK (0x3 << 12) /* Dynamic Memory Controller Clock Frequency Select */
46 #define ACCR_XN_MASK (0x7 << 8) /* Core PLL Turbo-Mode-to-Run-Mode Ratio */
47 #define ACCR_XL_MASK (0x1f) /* Core PLL Run-Mode-to-Oscillator Ratio */
49 #define ACCR_SMCFS(x) (((x) & 0x7) << 23)
50 #define ACCR_SFLFS(x) (((x) & 0x3) << 18)
51 #define ACCR_XSPCLK(x) (((x) & 0x3) << 16)
52 #define ACCR_HSS(x) (((x) & 0x3) << 14)
53 #define ACCR_DMCFS(x) (((x) & 0x3) << 12)
54 #define ACCR_XN(x) (((x) & 0x7) << 8)
55 #define ACCR_XL(x) ((x) & 0x1f)
60 #define CKEN_LCD 1 /* < LCD Clock Enable */
61 #define CKEN_USBH 2 /* < USB host clock enable */
62 #define CKEN_CAMERA 3 /* < Camera interface clock enable */
63 #define CKEN_NAND 4 /* < NAND Flash Controller Clock Enable */
64 #define CKEN_USB2 6 /* < USB 2.0 client clock enable. */
65 #define CKEN_DMC 8 /* < Dynamic Memory Controller clock enable */
66 #define CKEN_SMC 9 /* < Static Memory Controller clock enable */
67 #define CKEN_ISC 10 /* < Internal SRAM Controller clock enable */
68 #define CKEN_BOOT 11 /* < Boot rom clock enable */
69 #define CKEN_MMC1 12 /* < MMC1 Clock enable */
70 #define CKEN_MMC2 13 /* < MMC2 clock enable */
71 #define CKEN_KEYPAD 14 /* < Keypand Controller Clock Enable */
72 #define CKEN_CIR 15 /* < Consumer IR Clock Enable */
73 #define CKEN_USIM0 17 /* < USIM[0] Clock Enable */
74 #define CKEN_USIM1 18 /* < USIM[1] Clock Enable */
75 #define CKEN_TPM 19 /* < TPM clock enable */
76 #define CKEN_UDC 20 /* < UDC clock enable */
77 #define CKEN_BTUART 21 /* < BTUART clock enable */
78 #define CKEN_FFUART 22 /* < FFUART clock enable */
79 #define CKEN_STUART 23 /* < STUART clock enable */
80 #define CKEN_AC97 24 /* < AC97 clock enable */
81 #define CKEN_TOUCH 25 /* < Touch screen Interface Clock Enable */
82 #define CKEN_SSP1 26 /* < SSP1 clock enable */
83 #define CKEN_SSP2 27 /* < SSP2 clock enable */
84 #define CKEN_SSP3 28 /* < SSP3 clock enable */
85 #define CKEN_SSP4 29 /* < SSP4 clock enable */
86 #define CKEN_MSL0 30 /* < MSL0 clock enable */
87 #define CKEN_PWM0 32 /* < PWM[0] clock enable */
88 #define CKEN_PWM1 33 /* < PWM[1] clock enable */
89 #define CKEN_I2C 36 /* < I2C clock enable */
90 #define CKEN_INTC 38 /* < Interrupt controller clock enable */
91 #define CKEN_GPIO 39 /* < GPIO clock enable */
92 #define CKEN_1WIRE 40 /* < 1-wire clock enable */
93 #define CKEN_HSIO2 41 /* < HSIO2 clock enable */
94 #define CKEN_MINI_IM 48 /* < Mini-IM */
95 #define CKEN_MINI_LCD 49 /* < Mini LCD */
97 #define CKEN_MMC3 5 /* < MMC3 Clock Enable */
98 #define CKEN_MVED 43 /* < MVED clock enable */
100 /* Note: GCU clock enable bit differs on PXA300/PXA310 and PXA320 */
101 #define CKEN_PXA300_GCU 42 /* Graphics controller clock enable */
102 #define CKEN_PXA320_GCU 7 /* Graphics controller clock enable */
116 /* crystal frequency to HSIO bus frequency multiplier (HSS) */
117 static unsigned char hss_mult
[4] = { 8, 12, 16, 24 };
119 /* crystal frequency to static memory controller multiplier (SMCFS) */
120 static unsigned int smcfs_mult
[8] = { 6, 0, 8, 0, 0, 16, };
121 static const char * const get_freq_khz
[] = {
122 "core", "ring_osc_60mhz", "run", "cpll", "system_bus"
125 static void __iomem
*clk_regs
;
128 * Get the clock frequency as reflected by ACSR and the turbo flag.
129 * We assume these values have been applied via a fcs.
130 * If info is not 0 we also display the current settings.
132 unsigned int pxa3xx_get_clk_frequency_khz(int info
)
135 unsigned long clks
[5];
138 for (i
= 0; i
< 5; i
++) {
139 clk
= clk_get(NULL
, get_freq_khz
[i
]);
143 clks
[i
] = clk_get_rate(clk
);
148 pr_info("RO Mode clock: %ld.%02ldMHz\n",
149 clks
[1] / 1000000, (clks
[0] % 1000000) / 10000);
150 pr_info("Run Mode clock: %ld.%02ldMHz\n",
151 clks
[2] / 1000000, (clks
[1] % 1000000) / 10000);
152 pr_info("Turbo Mode clock: %ld.%02ldMHz\n",
153 clks
[3] / 1000000, (clks
[2] % 1000000) / 10000);
154 pr_info("System bus clock: %ld.%02ldMHz\n",
155 clks
[4] / 1000000, (clks
[4] % 1000000) / 10000);
157 return (unsigned int)clks
[0] / KHz
;
160 void pxa3xx_clk_update_accr(u32 disable
, u32 enable
, u32 xclkcfg
, u32 mask
)
162 u32 accr
= readl(clk_regs
+ ACCR
);
167 writel(accr
, clk_regs
+ ACCR
);
169 __asm__("mcr p14, 0, %0, c6, c0, 0\n" : : "r"(xclkcfg
));
171 while ((readl(clk_regs
+ ACSR
) & mask
) != (accr
& mask
))
175 static unsigned long clk_pxa3xx_ac97_get_rate(struct clk_hw
*hw
,
176 unsigned long parent_rate
)
178 unsigned long ac97_div
, rate
;
180 ac97_div
= readl(clk_regs
+ AC97_DIV
);
182 /* This may loose precision for some rates but won't for the
183 * standard 24.576MHz.
185 rate
= parent_rate
/ 2;
186 rate
/= ((ac97_div
>> 12) & 0x7fff);
187 rate
*= (ac97_div
& 0xfff);
191 PARENTS(clk_pxa3xx_ac97
) = { "spll_624mhz" };
192 RATE_RO_OPS(clk_pxa3xx_ac97
, "ac97");
194 static unsigned long clk_pxa3xx_smemc_get_rate(struct clk_hw
*hw
,
195 unsigned long parent_rate
)
197 unsigned long acsr
= readl(clk_regs
+ ACSR
);
199 return (parent_rate
/ 48) * smcfs_mult
[(acsr
>> 23) & 0x7] /
200 pxa3xx_smemc_get_memclkdiv();
203 PARENTS(clk_pxa3xx_smemc
) = { "spll_624mhz" };
204 RATE_RO_OPS(clk_pxa3xx_smemc
, "smemc");
206 static bool pxa3xx_is_ring_osc_forced(void)
208 unsigned long acsr
= readl(clk_regs
+ ACSR
);
210 return acsr
& ACCR_D0CS
;
213 PARENTS(pxa3xx_pbus
) = { "ring_osc_60mhz", "spll_624mhz" };
214 PARENTS(pxa3xx_32Khz_bus
) = { "osc_32_768khz", "osc_32_768khz" };
215 PARENTS(pxa3xx_13MHz_bus
) = { "osc_13mhz", "osc_13mhz" };
216 PARENTS(pxa3xx_ac97_bus
) = { "ring_osc_60mhz", "ac97" };
217 PARENTS(pxa3xx_sbus
) = { "ring_osc_60mhz", "system_bus" };
218 PARENTS(pxa3xx_smemcbus
) = { "ring_osc_60mhz", "smemc" };
220 #define CKEN_AB(bit) ((CKEN_ ## bit > 31) ? CKENB : CKENA)
221 #define PXA3XX_CKEN(dev_id, con_id, parents, mult_lp, div_lp, mult_hp, \
222 div_hp, bit, is_lp, flags) \
223 PXA_CKEN(dev_id, con_id, bit, parents, mult_lp, div_lp, \
224 mult_hp, div_hp, is_lp, CKEN_AB(bit), \
225 (CKEN_ ## bit % 32), flags)
226 #define PXA3XX_PBUS_CKEN(dev_id, con_id, bit, mult_lp, div_lp, \
227 mult_hp, div_hp, delay) \
228 PXA3XX_CKEN(dev_id, con_id, pxa3xx_pbus_parents, mult_lp, \
229 div_lp, mult_hp, div_hp, bit, pxa3xx_is_ring_osc_forced, 0)
230 #define PXA3XX_CKEN_1RATE(dev_id, con_id, bit, parents) \
231 PXA_CKEN_1RATE(dev_id, con_id, bit, parents, \
232 CKEN_AB(bit), (CKEN_ ## bit % 32), 0)
234 static struct desc_clk_cken pxa3xx_clocks
[] __initdata
= {
235 PXA3XX_PBUS_CKEN("pxa2xx-uart.0", NULL
, FFUART
, 1, 4, 1, 42, 1),
236 PXA3XX_PBUS_CKEN("pxa2xx-uart.1", NULL
, BTUART
, 1, 4, 1, 42, 1),
237 PXA3XX_PBUS_CKEN("pxa2xx-uart.2", NULL
, STUART
, 1, 4, 1, 42, 1),
238 PXA3XX_PBUS_CKEN("pxa2xx-i2c.0", NULL
, I2C
, 2, 5, 1, 19, 0),
239 PXA3XX_PBUS_CKEN("pxa27x-udc", NULL
, UDC
, 1, 4, 1, 13, 5),
240 PXA3XX_PBUS_CKEN("pxa27x-ohci", NULL
, USBH
, 1, 4, 1, 13, 0),
241 PXA3XX_PBUS_CKEN("pxa3xx-u2d", NULL
, USB2
, 1, 4, 1, 13, 0),
242 PXA3XX_PBUS_CKEN("pxa27x-pwm.0", NULL
, PWM0
, 1, 6, 1, 48, 0),
243 PXA3XX_PBUS_CKEN("pxa27x-pwm.1", NULL
, PWM1
, 1, 6, 1, 48, 0),
244 PXA3XX_PBUS_CKEN("pxa2xx-mci.0", NULL
, MMC1
, 1, 4, 1, 24, 0),
245 PXA3XX_PBUS_CKEN("pxa2xx-mci.1", NULL
, MMC2
, 1, 4, 1, 24, 0),
246 PXA3XX_PBUS_CKEN("pxa2xx-mci.2", NULL
, MMC3
, 1, 4, 1, 24, 0),
248 PXA3XX_CKEN_1RATE("pxa27x-keypad", NULL
, KEYPAD
,
249 pxa3xx_32Khz_bus_parents
),
250 PXA3XX_CKEN_1RATE("pxa3xx-ssp.0", NULL
, SSP1
, pxa3xx_13MHz_bus_parents
),
251 PXA3XX_CKEN_1RATE("pxa3xx-ssp.1", NULL
, SSP2
, pxa3xx_13MHz_bus_parents
),
252 PXA3XX_CKEN_1RATE("pxa3xx-ssp.2", NULL
, SSP3
, pxa3xx_13MHz_bus_parents
),
253 PXA3XX_CKEN_1RATE("pxa3xx-ssp.3", NULL
, SSP4
, pxa3xx_13MHz_bus_parents
),
255 PXA3XX_CKEN(NULL
, "AC97CLK", pxa3xx_ac97_bus_parents
, 1, 4, 1, 1, AC97
,
256 pxa3xx_is_ring_osc_forced
, 0),
257 PXA3XX_CKEN(NULL
, "CAMCLK", pxa3xx_sbus_parents
, 1, 2, 1, 1, CAMERA
,
258 pxa3xx_is_ring_osc_forced
, 0),
259 PXA3XX_CKEN("pxa2xx-fb", NULL
, pxa3xx_sbus_parents
, 1, 1, 1, 1, LCD
,
260 pxa3xx_is_ring_osc_forced
, 0),
261 PXA3XX_CKEN("pxa2xx-pcmcia", NULL
, pxa3xx_smemcbus_parents
, 1, 4,
262 1, 1, SMC
, pxa3xx_is_ring_osc_forced
, CLK_IGNORE_UNUSED
),
265 static struct desc_clk_cken pxa300_310_clocks
[] __initdata
= {
267 PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL
, PXA300_GCU
, 1, 1, 1, 1, 0),
268 PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL
, NAND
, 1, 2, 1, 4, 0),
269 PXA3XX_CKEN_1RATE("pxa3xx-gpio", NULL
, GPIO
, pxa3xx_13MHz_bus_parents
),
272 static struct desc_clk_cken pxa320_clocks
[] __initdata
= {
273 PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL
, NAND
, 1, 2, 1, 6, 0),
274 PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL
, PXA320_GCU
, 1, 1, 1, 1, 0),
275 PXA3XX_CKEN_1RATE("pxa3xx-gpio", NULL
, GPIO
, pxa3xx_13MHz_bus_parents
),
278 static struct desc_clk_cken pxa93x_clocks
[] __initdata
= {
280 PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL
, PXA300_GCU
, 1, 1, 1, 1, 0),
281 PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL
, NAND
, 1, 2, 1, 4, 0),
282 PXA3XX_CKEN_1RATE("pxa93x-gpio", NULL
, GPIO
, pxa3xx_13MHz_bus_parents
),
285 static unsigned long clk_pxa3xx_system_bus_get_rate(struct clk_hw
*hw
,
286 unsigned long parent_rate
)
288 unsigned long acsr
= readl(clk_regs
+ ACSR
);
289 unsigned int hss
= (acsr
>> 14) & 0x3;
291 if (pxa3xx_is_ring_osc_forced())
293 return parent_rate
/ 48 * hss_mult
[hss
];
296 static u8
clk_pxa3xx_system_bus_get_parent(struct clk_hw
*hw
)
298 if (pxa3xx_is_ring_osc_forced())
299 return PXA_BUS_60Mhz
;
304 PARENTS(clk_pxa3xx_system_bus
) = { "ring_osc_60mhz", "spll_624mhz" };
305 MUX_RO_RATE_RO_OPS(clk_pxa3xx_system_bus
, "system_bus");
307 static unsigned long clk_pxa3xx_core_get_rate(struct clk_hw
*hw
,
308 unsigned long parent_rate
)
313 static u8
clk_pxa3xx_core_get_parent(struct clk_hw
*hw
)
315 unsigned long xclkcfg
;
318 if (pxa3xx_is_ring_osc_forced())
319 return PXA_CORE_60Mhz
;
321 /* Read XCLKCFG register turbo bit */
322 __asm__
__volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg
));
326 return PXA_CORE_TURBO
;
329 PARENTS(clk_pxa3xx_core
) = { "ring_osc_60mhz", "run", "cpll" };
330 MUX_RO_RATE_RO_OPS(clk_pxa3xx_core
, "core");
332 static unsigned long clk_pxa3xx_run_get_rate(struct clk_hw
*hw
,
333 unsigned long parent_rate
)
335 unsigned long acsr
= readl(clk_regs
+ ACSR
);
336 unsigned int xn
= (acsr
& ACCR_XN_MASK
) >> 8;
337 unsigned int t
, xclkcfg
;
339 /* Read XCLKCFG register turbo bit */
340 __asm__
__volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg
));
343 return t
? (parent_rate
/ xn
) * 2 : parent_rate
;
345 PARENTS(clk_pxa3xx_run
) = { "cpll" };
346 RATE_RO_OPS(clk_pxa3xx_run
, "run");
348 static unsigned long clk_pxa3xx_cpll_get_rate(struct clk_hw
*hw
,
349 unsigned long parent_rate
)
351 unsigned long acsr
= readl(clk_regs
+ ACSR
);
352 unsigned int xn
= (acsr
& ACCR_XN_MASK
) >> 8;
353 unsigned int xl
= acsr
& ACCR_XL_MASK
;
354 unsigned int t
, xclkcfg
;
356 /* Read XCLKCFG register turbo bit */
357 __asm__
__volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg
));
360 pr_info("RJK: parent_rate=%lu, xl=%u, xn=%u\n", parent_rate
, xl
, xn
);
361 return t
? parent_rate
* xl
* xn
: parent_rate
* xl
;
363 PARENTS(clk_pxa3xx_cpll
) = { "osc_13mhz" };
364 RATE_RO_OPS(clk_pxa3xx_cpll
, "cpll");
366 static void __init
pxa3xx_register_core(void)
368 clk_register_clk_pxa3xx_cpll();
369 clk_register_clk_pxa3xx_run();
371 clkdev_pxa_register(CLK_CORE
, "core", NULL
,
372 clk_register_clk_pxa3xx_core());
375 static void __init
pxa3xx_register_plls(void)
377 clk_register_fixed_rate(NULL
, "osc_13mhz", NULL
,
378 CLK_GET_RATE_NOCACHE
,
380 clkdev_pxa_register(CLK_OSC32k768
, "osc_32_768khz", NULL
,
381 clk_register_fixed_rate(NULL
, "osc_32_768khz", NULL
,
382 CLK_GET_RATE_NOCACHE
,
384 clk_register_fixed_rate(NULL
, "ring_osc_120mhz", NULL
,
385 CLK_GET_RATE_NOCACHE
,
387 clk_register_fixed_rate(NULL
, "clk_dummy", NULL
, 0, 0);
388 clk_register_fixed_factor(NULL
, "spll_624mhz", "osc_13mhz", 0, 48, 1);
389 clk_register_fixed_factor(NULL
, "ring_osc_60mhz", "ring_osc_120mhz",
393 #define DUMMY_CLK(_con_id, _dev_id, _parent) \
394 { .con_id = _con_id, .dev_id = _dev_id, .parent = _parent }
400 static struct dummy_clk dummy_clks
[] __initdata
= {
401 DUMMY_CLK(NULL
, "pxa93x-gpio", "osc_13mhz"),
402 DUMMY_CLK(NULL
, "sa1100-rtc", "osc_32_768khz"),
403 DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"),
404 DUMMY_CLK(NULL
, "pxa3xx-pwri2c.1", "osc_13mhz"),
407 static void __init
pxa3xx_dummy_clocks_init(void)
414 for (i
= 0; i
< ARRAY_SIZE(dummy_clks
); i
++) {
416 name
= d
->dev_id
? d
->dev_id
: d
->con_id
;
417 clk
= clk_register_fixed_factor(NULL
, name
, d
->parent
, 0, 1, 1);
418 clk_register_clkdev(clk
, d
->con_id
, d
->dev_id
);
422 static void __init
pxa3xx_base_clocks_init(void __iomem
*oscc_reg
)
426 pxa3xx_register_plls();
427 pxa3xx_register_core();
428 clk_register_clk_pxa3xx_system_bus();
429 clk_register_clk_pxa3xx_ac97();
430 clk_register_clk_pxa3xx_smemc();
431 clk
= clk_register_gate(NULL
, "CLK_POUT",
432 "osc_13mhz", 0, oscc_reg
, 11, 0, NULL
);
433 clk_register_clkdev(clk
, "CLK_POUT", NULL
);
434 clkdev_pxa_register(CLK_OSTIMER
, "OSTIMER0", NULL
,
435 clk_register_fixed_factor(NULL
, "os-timer0",
436 "osc_13mhz", 0, 1, 4));
439 int __init
pxa3xx_clocks_init(void __iomem
*regs
, void __iomem
*oscc_reg
)
444 pxa3xx_base_clocks_init(oscc_reg
);
445 pxa3xx_dummy_clocks_init();
446 ret
= clk_pxa_cken_init(pxa3xx_clocks
, ARRAY_SIZE(pxa3xx_clocks
), regs
);
450 return clk_pxa_cken_init(pxa320_clocks
,
451 ARRAY_SIZE(pxa320_clocks
), regs
);
452 if (cpu_is_pxa300() || cpu_is_pxa310())
453 return clk_pxa_cken_init(pxa300_310_clocks
,
454 ARRAY_SIZE(pxa300_310_clocks
), regs
);
455 return clk_pxa_cken_init(pxa93x_clocks
, ARRAY_SIZE(pxa93x_clocks
), regs
);
458 static void __init
pxa3xx_dt_clocks_init(struct device_node
*np
)
460 pxa3xx_clocks_init(ioremap(0x41340000, 0x10), ioremap(0x41350000, 4));
461 clk_pxa_dt_common_init(np
);
463 CLK_OF_DECLARE(pxa_clks
, "marvell,pxa300-clocks", pxa3xx_dt_clocks_init
);