/* * 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 #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, }; #define PXA27x_CLKCFG(B, HT, T) \ (CLKCFG_FCS | \ ((B) ? CLKCFG_FASTBUS : 0) | \ ((HT) ? CLKCFG_HALFTURBO : 0) | \ ((T) ? CLKCFG_TURBO : 0)) #define PXA27x_CCCR(A, L, N2) (A << 25 | N2 << 7 | L) #define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3) #define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3) /* Define the refresh period in mSec for the SDRAM and the number of rows */ #define SDRAM_TREF 64 /* standard 64ms SDRAM */ static const char * const get_freq_khz[] = { "core", "run", "cpll", "memory", "system_bus" }; static int get_sdram_rows(void) { static int sdram_rows; unsigned int drac2 = 0, drac0 = 0; u32 mdcnfg; if (sdram_rows) return sdram_rows; mdcnfg = readl_relaxed(MDCNFG); if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3)) drac2 = MDCNFG_DRAC2(mdcnfg); if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1)) drac0 = MDCNFG_DRAC0(mdcnfg); sdram_rows = 1 << (11 + max(drac0, drac2)); return sdram_rows; } static u32 mdrefr_dri(unsigned int freq_khz) { u32 interval = freq_khz * SDRAM_TREF / get_sdram_rows(); return (interval - 31) / 32; } /* * 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] / KHz; } bool pxa27x_is_ppll_disabled(void) { unsigned long ccsr = readl(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), }; /* * PXA270 definitions * * For the PXA27x: * Control variables are A, L, 2N for CCCR; B, HT, T for CLKCFG. * * A = 0 => memory controller clock from table 3-7, * A = 1 => memory controller clock = system bus clock * Run mode frequency = 13 MHz * L * Turbo mode frequency = 13 MHz * L * N * System bus frequency = 13 MHz * L / (B + 1) * * In CCCR: * A = 1 * L = 16 oscillator to run mode ratio * 2N = 6 2 * (turbo mode to run mode ratio) * * In CCLKCFG: * B = 1 Fast bus mode * HT = 0 Half-Turbo mode * T = 1 Turbo mode * * For now, just support some of the combinations in table 3-7 of * PXA27x Processor Family Developer's Manual to simplify frequency * change sequences. */ static struct pxa2xx_freq pxa27x_freqs[] = { {104000000, 104000, PXA27x_CCCR(1, 8, 2), 0, PXA27x_CLKCFG(1, 0, 1) }, {156000000, 104000, PXA27x_CCCR(1, 8, 3), 0, PXA27x_CLKCFG(1, 0, 1) }, {208000000, 208000, PXA27x_CCCR(0, 16, 2), 1, PXA27x_CLKCFG(0, 0, 1) }, {312000000, 208000, PXA27x_CCCR(1, 16, 3), 1, PXA27x_CLKCFG(1, 0, 1) }, {416000000, 208000, PXA27x_CCCR(1, 16, 4), 1, PXA27x_CLKCFG(1, 0, 1) }, {520000000, 208000, PXA27x_CCCR(1, 16, 5), 1, PXA27x_CLKCFG(1, 0, 1) }, {624000000, 208000, PXA27x_CCCR(1, 16, 6), 1, PXA27x_CLKCFG(1, 0, 1) }, }; 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 = readl(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 N; } static int clk_pxa27x_cpll_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) { return pxa2xx_determine_rate(req, pxa27x_freqs, ARRAY_SIZE(pxa27x_freqs)); } static int clk_pxa27x_cpll_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { int i; pr_debug("%s(rate=%lu parent_rate=%lu)\n", __func__, rate, parent_rate); for (i = 0; i < ARRAY_SIZE(pxa27x_freqs); i++) if (pxa27x_freqs[i].cpll == rate) break; if (i >= ARRAY_SIZE(pxa27x_freqs)) return -EINVAL; pxa2xx_cpll_change(&pxa27x_freqs[i], mdrefr_dri, MDREFR, CCCR); return 0; } PARENTS(clk_pxa27x_cpll) = { "osc_13mhz" }; RATE_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 = readl(CCSR); unsigned long cccr = readl(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 = readl(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, 13 * MHz); clkdev_pxa_register(CLK_OSC32k768, "osc_32_768khz", NULL, clk_register_fixed_rate(NULL, "osc_32_768khz", NULL, CLK_GET_RATE_NOCACHE, 32768 * KHz)); clk_register_fixed_rate(NULL, "clk_dummy", NULL, 0, 0); clk_register_fixed_factor(NULL, "ppll_312mhz", "osc_13mhz", 0, 24, 1); } static u8 clk_pxa27x_core_get_parent(struct clk_hw *hw) { unsigned long clkcfg; unsigned int t, ht, osc_forced; unsigned long ccsr = readl(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); if (ht || t) return PXA_CORE_TURBO; return PXA_CORE_RUN; } static int clk_pxa27x_core_set_parent(struct clk_hw *hw, u8 index) { if (index > PXA_CORE_TURBO) return -EINVAL; pxa2xx_core_turbo_switch(index == PXA_CORE_TURBO); return 0; } static int clk_pxa27x_core_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) { return __clk_mux_determine_rate(hw, req); } PARENTS(clk_pxa27x_core) = { "osc_13mhz", "run", "cpll" }; MUX_OPS(clk_pxa27x_core, "core", CLK_SET_RATE_PARENT); static unsigned long clk_pxa27x_run_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long ccsr = readl(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) { clkdev_pxa_register(CLK_NONE, "cpll", NULL, clk_register_clk_pxa27x_cpll()); clkdev_pxa_register(CLK_NONE, "run", NULL, 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 = readl(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; else return parent_rate / 2; } static u8 clk_pxa27x_system_bus_get_parent(struct clk_hw *hw) { unsigned int osc_forced; unsigned long ccsr = readl(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 = readl(CCCR); unsigned long ccsr = readl(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 = readl(CCCR); unsigned long ccsr = readl(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"); #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, "pxa27x-gpio", "osc_32_768khz"), DUMMY_CLK(NULL, "pxa-rtc", "osc_32_768khz"), DUMMY_CLK(NULL, "sa1100-rtc", "osc_32_768khz"), DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"), }; static void __init pxa27x_dummy_clocks_init(void) { struct clk *clk; struct dummy_clk *d; const char *name; int i; 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); } } static void __init pxa27x_base_clocks_init(void) { pxa27x_register_plls(); pxa27x_register_core(); clkdev_pxa_register(CLK_NONE, "system_bus", NULL, clk_register_clk_pxa27x_system_bus()); clkdev_pxa_register(CLK_NONE, "memory", NULL, clk_register_clk_pxa27x_memory()); clk_register_clk_pxa27x_lcd_base(); } int __init pxa27x_clocks_init(void) { pxa27x_base_clocks_init(); pxa27x_dummy_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);