/* * Marvell PXA25x family clocks * * Copyright (C) 2014 Robert Jarzmik * * Heavily inspired from former arch/arm/mach-pxa/pxa25x.c. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * For non-devicetree platforms. Once pxa is fully converted to devicetree, this * should go away. */ #include #include #include #include #include #include #include #include #include "clk-pxa.h" #define KHz 1000 #define MHz (1000 * 1000) enum { PXA_CORE_RUN = 0, PXA_CORE_TURBO, }; /* * Various clock factors driven by the CCCR register. */ /* Crystal Frequency to Memory Frequency Multiplier (L) */ static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, }; /* Memory Frequency to Run Mode Frequency Multiplier (M) */ static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 }; /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */ /* Note: we store the value N * 2 here. */ static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 }; static const char * const get_freq_khz[] = { "core", "run", "cpll", "memory" }; /* * Get the clock frequency as reflected by CCCR and the turbo flag. * We assume these values have been applied via a fcs. * If info is not 0 we also display the current settings. */ unsigned int pxa25x_get_clk_frequency_khz(int info) { struct clk *clk; unsigned long clks[5]; int i; for (i = 0; i < ARRAY_SIZE(get_freq_khz); i++) { clk = clk_get(NULL, get_freq_khz[i]); if (IS_ERR(clk)) { clks[i] = 0; } else { clks[i] = clk_get_rate(clk); clk_put(clk); } } if (info) { pr_info("Run Mode clock: %ld.%02ldMHz\n", clks[1] / 1000000, (clks[1] % 1000000) / 10000); pr_info("Turbo Mode clock: %ld.%02ldMHz\n", clks[2] / 1000000, (clks[2] % 1000000) / 10000); pr_info("Memory clock: %ld.%02ldMHz\n", clks[3] / 1000000, (clks[3] % 1000000) / 10000); } return (unsigned int)clks[0] / KHz; } static unsigned long clk_pxa25x_memory_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long cccr = CCCR; unsigned int m = M_clk_mult[(cccr >> 5) & 0x03]; return parent_rate / m; } PARENTS(clk_pxa25x_memory) = { "run" }; RATE_RO_OPS(clk_pxa25x_memory, "memory"); PARENTS(pxa25x_pbus95) = { "ppll_95_85mhz", "ppll_95_85mhz" }; PARENTS(pxa25x_pbus147) = { "ppll_147_46mhz", "ppll_147_46mhz" }; PARENTS(pxa25x_osc3) = { "osc_3_6864mhz", "osc_3_6864mhz" }; #define PXA25X_CKEN(dev_id, con_id, parents, mult, div, \ bit, is_lp, flags) \ PXA_CKEN(dev_id, con_id, bit, parents, mult, div, mult, div, \ is_lp, &CKEN, CKEN_ ## bit, flags) #define PXA25X_PBUS95_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay) \ PXA25X_CKEN(dev_id, con_id, pxa25x_pbus95_parents, mult_hp, \ div_hp, bit, NULL, 0) #define PXA25X_PBUS147_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay)\ PXA25X_CKEN(dev_id, con_id, pxa25x_pbus147_parents, mult_hp, \ div_hp, bit, NULL, 0) #define PXA25X_OSC3_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay) \ PXA25X_CKEN(dev_id, con_id, pxa25x_osc3_parents, mult_hp, \ div_hp, bit, NULL, 0) #define PXA25X_CKEN_1RATE(dev_id, con_id, bit, parents, delay) \ PXA_CKEN_1RATE(dev_id, con_id, bit, parents, \ &CKEN, CKEN_ ## bit, 0) #define PXA25X_CKEN_1RATE_AO(dev_id, con_id, bit, parents, delay) \ PXA_CKEN_1RATE(dev_id, con_id, bit, parents, \ &CKEN, CKEN_ ## bit, CLK_IGNORE_UNUSED) static struct desc_clk_cken pxa25x_clocks[] __initdata = { PXA25X_PBUS95_CKEN("pxa2xx-mci.0", NULL, MMC, 1, 5, 0), PXA25X_PBUS95_CKEN("pxa2xx-i2c.0", NULL, I2C, 1, 3, 0), PXA25X_PBUS95_CKEN("pxa2xx-ir", "FICPCLK", FICP, 1, 2, 0), PXA25X_PBUS95_CKEN("pxa25x-udc", NULL, USB, 1, 2, 5), PXA25X_PBUS147_CKEN("pxa2xx-uart.0", NULL, FFUART, 1, 10, 1), PXA25X_PBUS147_CKEN("pxa2xx-uart.1", NULL, BTUART, 1, 10, 1), PXA25X_PBUS147_CKEN("pxa2xx-uart.2", NULL, STUART, 1, 10, 1), PXA25X_PBUS147_CKEN("pxa2xx-uart.3", NULL, HWUART, 1, 10, 1), PXA25X_PBUS147_CKEN("pxa2xx-i2s", NULL, I2S, 1, 10, 0), PXA25X_PBUS147_CKEN(NULL, "AC97CLK", AC97, 1, 12, 0), PXA25X_OSC3_CKEN("pxa25x-ssp.0", NULL, SSP, 1, 1, 0), PXA25X_OSC3_CKEN("pxa25x-nssp.1", NULL, NSSP, 1, 1, 0), PXA25X_OSC3_CKEN("pxa25x-nssp.2", NULL, ASSP, 1, 1, 0), PXA25X_OSC3_CKEN("pxa25x-pwm.0", NULL, PWM0, 1, 1, 0), PXA25X_OSC3_CKEN("pxa25x-pwm.1", NULL, PWM1, 1, 1, 0), PXA25X_CKEN_1RATE("pxa2xx-fb", NULL, LCD, clk_pxa25x_memory_parents, 0), PXA25X_CKEN_1RATE_AO("pxa2xx-pcmcia", NULL, MEMC, clk_pxa25x_memory_parents, 0), }; static u8 clk_pxa25x_core_get_parent(struct clk_hw *hw) { unsigned long clkcfg; unsigned int t; asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg)); t = clkcfg & (1 << 0); if (t) return PXA_CORE_TURBO; return PXA_CORE_RUN; } static unsigned long clk_pxa25x_core_get_rate(struct clk_hw *hw, unsigned long parent_rate) { return parent_rate; } PARENTS(clk_pxa25x_core) = { "run", "cpll" }; MUX_RO_RATE_RO_OPS(clk_pxa25x_core, "core"); static unsigned long clk_pxa25x_run_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long cccr = CCCR; unsigned int n2 = N2_clk_mult[(cccr >> 7) & 0x07]; return (parent_rate / n2) * 2; } PARENTS(clk_pxa25x_run) = { "cpll" }; RATE_RO_OPS(clk_pxa25x_run, "run"); static unsigned long clk_pxa25x_cpll_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long clkcfg, cccr = CCCR; unsigned int l, m, n2, t; asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg)); t = clkcfg & (1 << 0); l = L_clk_mult[(cccr >> 0) & 0x1f]; m = M_clk_mult[(cccr >> 5) & 0x03]; n2 = N2_clk_mult[(cccr >> 7) & 0x07]; if (t) return m * l * n2 * parent_rate / 2; return m * l * parent_rate; } PARENTS(clk_pxa25x_cpll) = { "osc_3_6864mhz" }; RATE_RO_OPS(clk_pxa25x_cpll, "cpll"); static void __init pxa25x_register_core(void) { clk_register_clk_pxa25x_cpll(); clk_register_clk_pxa25x_run(); clkdev_pxa_register(CLK_CORE, "core", NULL, clk_register_clk_pxa25x_core()); } static void __init pxa25x_register_plls(void) { clk_register_fixed_rate(NULL, "osc_3_6864mhz", NULL, CLK_GET_RATE_NOCACHE | CLK_IS_ROOT, 3686400); clk_register_fixed_rate(NULL, "osc_32_768khz", NULL, CLK_GET_RATE_NOCACHE | CLK_IS_ROOT, 32768); clk_register_fixed_rate(NULL, "clk_dummy", NULL, CLK_IS_ROOT, 0); clk_register_fixed_factor(NULL, "ppll_95_85mhz", "osc_3_6864mhz", 0, 26, 1); clk_register_fixed_factor(NULL, "ppll_147_46mhz", "osc_3_6864mhz", 0, 40, 1); } static void __init pxa25x_base_clocks_init(void) { pxa25x_register_plls(); pxa25x_register_core(); clk_register_clk_pxa25x_memory(); } #define DUMMY_CLK(_con_id, _dev_id, _parent) \ { .con_id = _con_id, .dev_id = _dev_id, .parent = _parent } struct dummy_clk { const char *con_id; const char *dev_id; const char *parent; }; static struct dummy_clk dummy_clks[] __initdata = { DUMMY_CLK(NULL, "pxa25x-gpio", "osc_32_768khz"), DUMMY_CLK(NULL, "pxa26x-gpio", "osc_32_768khz"), DUMMY_CLK("GPIO11_CLK", NULL, "osc_3_6864mhz"), DUMMY_CLK("GPIO12_CLK", NULL, "osc_32_768khz"), DUMMY_CLK(NULL, "sa1100-rtc", "osc_32_768khz"), DUMMY_CLK("OSTIMER0", NULL, "osc_32_768khz"), DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"), }; static void __init pxa25x_dummy_clocks_init(void) { struct clk *clk; struct dummy_clk *d; const char *name; int i; /* * All pinctrl logic has been wiped out of the clock driver, especially * for gpio11 and gpio12 outputs. Machine code should ensure proper pin * control (ie. pxa2xx_mfp_config() invocation). */ for (i = 0; i < ARRAY_SIZE(dummy_clks); i++) { d = &dummy_clks[i]; name = d->dev_id ? d->dev_id : d->con_id; clk = clk_register_fixed_factor(NULL, name, d->parent, 0, 1, 1); clk_register_clkdev(clk, d->con_id, d->dev_id); } } int __init pxa25x_clocks_init(void) { pxa25x_base_clocks_init(); pxa25x_dummy_clocks_init(); return clk_pxa_cken_init(pxa25x_clocks, ARRAY_SIZE(pxa25x_clocks)); } static void __init pxa25x_dt_clocks_init(struct device_node *np) { pxa25x_clocks_init(); clk_pxa_dt_common_init(np); } CLK_OF_DECLARE(pxa25x_clks, "marvell,pxa250-core-clocks", pxa25x_dt_clocks_init);