/* * Marvell PXA27x family clocks * * Copyright (C) 2014 Robert Jarzmik * * Heavily inspired from former arch/arm/mach-pxa/clock.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. * */ #include #include #include #include #include #include #include #include "clk-pxa.h" #define KHz 1000 #define MHz (1000 * 1000) enum { PXA_CORE_13Mhz = 0, PXA_CORE_RUN, PXA_CORE_TURBO, }; enum { PXA_BUS_13Mhz = 0, PXA_BUS_RUN, }; enum { PXA_LCD_13Mhz = 0, PXA_LCD_RUN, }; enum { PXA_MEM_13Mhz = 0, PXA_MEM_SYSTEM_BUS, PXA_MEM_RUN, }; static const char * const get_freq_khz[] = { "core", "run", "cpll", "memory", "system_bus" }; /* * Get the clock frequency as reflected by CCSR 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 pxa27x_get_clk_frequency_khz(int info) { struct clk *clk; unsigned long clks[5]; int i; for (i = 0; i < 5; 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); pr_info("System bus clock: %ld.%02ldMHz\n", clks[4] / 1000000, (clks[4] % 1000000) / 10000); } return (unsigned int)clks[0]; } bool pxa27x_is_ppll_disabled(void) { unsigned long ccsr = CCSR; return ccsr & (1 << CCCR_PPDIS_BIT); } #define PXA27X_CKEN(dev_id, con_id, parents, mult_hp, div_hp, \ bit, is_lp, flags) \ PXA_CKEN(dev_id, con_id, bit, parents, 1, 1, mult_hp, div_hp, \ is_lp, &CKEN, CKEN_ ## bit, flags) #define PXA27X_PBUS_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay) \ PXA27X_CKEN(dev_id, con_id, pxa27x_pbus_parents, mult_hp, \ div_hp, bit, pxa27x_is_ppll_disabled, 0) PARENTS(pxa27x_pbus) = { "osc_13mhz", "ppll_312mhz" }; PARENTS(pxa27x_sbus) = { "system_bus", "system_bus" }; PARENTS(pxa27x_32Mhz_bus) = { "osc_32_768khz", "osc_32_768khz" }; PARENTS(pxa27x_lcd_bus) = { "lcd_base", "lcd_base" }; PARENTS(pxa27x_membus) = { "lcd_base", "lcd_base" }; #define PXA27X_CKEN_1RATE(dev_id, con_id, bit, parents, delay) \ PXA_CKEN_1RATE(dev_id, con_id, bit, parents, \ &CKEN, CKEN_ ## bit, 0) #define PXA27X_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 pxa27x_clocks[] __initdata = { PXA27X_PBUS_CKEN("pxa2xx-uart.0", NULL, FFUART, 2, 42, 1), PXA27X_PBUS_CKEN("pxa2xx-uart.1", NULL, BTUART, 2, 42, 1), PXA27X_PBUS_CKEN("pxa2xx-uart.2", NULL, STUART, 2, 42, 1), PXA27X_PBUS_CKEN("pxa2xx-i2s", NULL, I2S, 2, 51, 0), PXA27X_PBUS_CKEN("pxa2xx-i2c.0", NULL, I2C, 2, 19, 0), PXA27X_PBUS_CKEN("pxa27x-udc", NULL, USB, 2, 13, 5), PXA27X_PBUS_CKEN("pxa2xx-mci.0", NULL, MMC, 2, 32, 0), PXA27X_PBUS_CKEN("pxa2xx-ir", "FICPCLK", FICP, 2, 13, 0), PXA27X_PBUS_CKEN("pxa27x-ohci", NULL, USBHOST, 2, 13, 0), PXA27X_PBUS_CKEN("pxa2xx-i2c.1", NULL, PWRI2C, 1, 24, 0), PXA27X_PBUS_CKEN("pxa27x-ssp.0", NULL, SSP1, 1, 24, 0), PXA27X_PBUS_CKEN("pxa27x-ssp.1", NULL, SSP2, 1, 24, 0), PXA27X_PBUS_CKEN("pxa27x-ssp.2", NULL, SSP3, 1, 24, 0), PXA27X_PBUS_CKEN("pxa27x-pwm.0", NULL, PWM0, 1, 24, 0), PXA27X_PBUS_CKEN("pxa27x-pwm.1", NULL, PWM1, 1, 24, 0), PXA27X_PBUS_CKEN(NULL, "MSLCLK", MSL, 2, 13, 0), PXA27X_PBUS_CKEN(NULL, "USIMCLK", USIM, 2, 13, 0), PXA27X_PBUS_CKEN(NULL, "MSTKCLK", MEMSTK, 2, 32, 0), PXA27X_PBUS_CKEN(NULL, "AC97CLK", AC97, 1, 1, 0), PXA27X_PBUS_CKEN(NULL, "AC97CONFCLK", AC97CONF, 1, 1, 0), PXA27X_PBUS_CKEN(NULL, "OSTIMER0", OSTIMER, 1, 96, 0), PXA27X_CKEN_1RATE("pxa27x-keypad", NULL, KEYPAD, pxa27x_32Mhz_bus_parents, 0), PXA27X_CKEN_1RATE(NULL, "IMCLK", IM, pxa27x_sbus_parents, 0), PXA27X_CKEN_1RATE("pxa2xx-fb", NULL, LCD, pxa27x_lcd_bus_parents, 0), PXA27X_CKEN_1RATE("pxa27x-camera.0", NULL, CAMERA, pxa27x_lcd_bus_parents, 0), PXA27X_CKEN_1RATE_AO("pxa2xx-pcmcia", NULL, MEMC, pxa27x_membus_parents, 0), }; static unsigned long clk_pxa27x_cpll_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long clkcfg; unsigned int t, ht; unsigned int l, L, n2, N; unsigned long ccsr = CCSR; asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg)); t = clkcfg & (1 << 0); ht = clkcfg & (1 << 2); l = ccsr & CCSR_L_MASK; n2 = (ccsr & CCSR_N2_MASK) >> CCSR_N2_SHIFT; L = l * parent_rate; N = (L * n2) / 2; return t ? N : L; } PARENTS(clk_pxa27x_cpll) = { "osc_13mhz" }; RATE_RO_OPS(clk_pxa27x_cpll, "cpll"); static unsigned long clk_pxa27x_lcd_base_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned int l, osc_forced; unsigned long ccsr = CCSR; unsigned long cccr = CCCR; l = ccsr & CCSR_L_MASK; osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); if (osc_forced) { if (cccr & (1 << CCCR_LCD_26_BIT)) return parent_rate * 2; else return parent_rate; } if (l <= 7) return parent_rate; if (l <= 16) return parent_rate / 2; return parent_rate / 4; } static u8 clk_pxa27x_lcd_base_get_parent(struct clk_hw *hw) { unsigned int osc_forced; unsigned long ccsr = CCSR; osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); if (osc_forced) return PXA_LCD_13Mhz; else return PXA_LCD_RUN; } PARENTS(clk_pxa27x_lcd_base) = { "osc_13mhz", "run" }; MUX_RO_RATE_RO_OPS(clk_pxa27x_lcd_base, "lcd_base"); static void __init pxa27x_register_plls(void) { clk_register_fixed_rate(NULL, "osc_13mhz", NULL, CLK_GET_RATE_NOCACHE | CLK_IS_ROOT, 13 * MHz); clk_register_fixed_rate(NULL, "osc_32_768khz", NULL, CLK_GET_RATE_NOCACHE | CLK_IS_ROOT, 32768 * KHz); clk_register_fixed_rate(NULL, "clk_dummy", NULL, CLK_IS_ROOT, 0); clk_register_fixed_factor(NULL, "ppll_312mhz", "osc_13mhz", 0, 24, 1); } static unsigned long clk_pxa27x_core_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long clkcfg; unsigned int t, ht, b, osc_forced; unsigned long ccsr = CCSR; osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg)); t = clkcfg & (1 << 0); ht = clkcfg & (1 << 2); b = clkcfg & (1 << 3); if (osc_forced) return parent_rate; if (ht) return parent_rate / 2; else return parent_rate; } static u8 clk_pxa27x_core_get_parent(struct clk_hw *hw) { unsigned long clkcfg; unsigned int t, ht, b, osc_forced; unsigned long ccsr = CCSR; osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); if (osc_forced) return PXA_CORE_13Mhz; asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg)); t = clkcfg & (1 << 0); ht = clkcfg & (1 << 2); b = clkcfg & (1 << 3); if (ht || t) return PXA_CORE_TURBO; return PXA_CORE_RUN; } PARENTS(clk_pxa27x_core) = { "osc_13mhz", "run", "cpll" }; MUX_RO_RATE_RO_OPS(clk_pxa27x_core, "core"); static unsigned long clk_pxa27x_run_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long ccsr = CCSR; unsigned int n2 = (ccsr & CCSR_N2_MASK) >> CCSR_N2_SHIFT; return (parent_rate / n2) * 2; } PARENTS(clk_pxa27x_run) = { "cpll" }; RATE_RO_OPS(clk_pxa27x_run, "run"); static void __init pxa27x_register_core(void) { clk_register_clk_pxa27x_cpll(); clk_register_clk_pxa27x_run(); clkdev_pxa_register(CLK_CORE, "core", NULL, clk_register_clk_pxa27x_core()); } static unsigned long clk_pxa27x_system_bus_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long clkcfg; unsigned int b, osc_forced; unsigned long ccsr = CCSR; osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg)); b = clkcfg & (1 << 3); if (osc_forced) return parent_rate; if (b) return parent_rate / 2; else return parent_rate; } static u8 clk_pxa27x_system_bus_get_parent(struct clk_hw *hw) { unsigned int osc_forced; unsigned long ccsr = CCSR; osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); if (osc_forced) return PXA_BUS_13Mhz; else return PXA_BUS_RUN; } PARENTS(clk_pxa27x_system_bus) = { "osc_13mhz", "run" }; MUX_RO_RATE_RO_OPS(clk_pxa27x_system_bus, "system_bus"); static unsigned long clk_pxa27x_memory_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned int a, l, osc_forced; unsigned long cccr = CCCR; unsigned long ccsr = CCSR; osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); a = cccr & (1 << CCCR_A_BIT); l = ccsr & CCSR_L_MASK; if (osc_forced || a) return parent_rate; if (l <= 10) return parent_rate; if (l <= 20) return parent_rate / 2; return parent_rate / 4; } static u8 clk_pxa27x_memory_get_parent(struct clk_hw *hw) { unsigned int osc_forced, a; unsigned long cccr = CCCR; unsigned long ccsr = CCSR; osc_forced = ccsr & (1 << CCCR_CPDIS_BIT); a = cccr & (1 << CCCR_A_BIT); if (osc_forced) return PXA_MEM_13Mhz; if (a) return PXA_MEM_SYSTEM_BUS; else return PXA_MEM_RUN; } PARENTS(clk_pxa27x_memory) = { "osc_13mhz", "system_bus", "run" }; MUX_RO_RATE_RO_OPS(clk_pxa27x_memory, "memory"); static void __init pxa27x_base_clocks_init(void) { pxa27x_register_plls(); pxa27x_register_core(); clk_register_clk_pxa27x_system_bus(); clk_register_clk_pxa27x_memory(); clk_register_clk_pxa27x_lcd_base(); } int __init pxa27x_clocks_init(void) { pxa27x_base_clocks_init(); return clk_pxa_cken_init(pxa27x_clocks, ARRAY_SIZE(pxa27x_clocks)); } static void __init pxa27x_dt_clocks_init(struct device_node *np) { pxa27x_clocks_init(); clk_pxa_dt_common_init(np); } CLK_OF_DECLARE(pxa_clks, "marvell,pxa270-clocks", pxa27x_dt_clocks_init);