/* * Marvell PXA3xxx family clocks * * Copyright (C) 2014 Robert Jarzmik * * Heavily inspired from former arch/arm/mach-pxa/pxa3xx.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_60Mhz = 0, PXA_CORE_RUN, PXA_CORE_TURBO, }; enum { PXA_BUS_60Mhz = 0, PXA_BUS_HSS, }; /* crystal frequency to HSIO bus frequency multiplier (HSS) */ static unsigned char hss_mult[4] = { 8, 12, 16, 24 }; /* crystal frequency to static memory controller multiplier (SMCFS) */ static unsigned int smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, }; static unsigned int df_clkdiv[4] = { 1, 2, 4, 1 }; static const char * const get_freq_khz[] = { "core", "ring_osc_60mhz", "run", "cpll", "system_bus" }; /* * Get the clock frequency as reflected by ACSR 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 pxa3xx_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("RO Mode clock: %ld.%02ldMHz\n", clks[1] / 1000000, (clks[0] % 1000000) / 10000); pr_info("Run Mode clock: %ld.%02ldMHz\n", clks[2] / 1000000, (clks[1] % 1000000) / 10000); pr_info("Turbo Mode clock: %ld.%02ldMHz\n", clks[3] / 1000000, (clks[2] % 1000000) / 10000); pr_info("System bus clock: %ld.%02ldMHz\n", clks[4] / 1000000, (clks[4] % 1000000) / 10000); } return (unsigned int)clks[0] / KHz; } static unsigned long clk_pxa3xx_ac97_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long ac97_div, rate; ac97_div = AC97_DIV; /* This may loose precision for some rates but won't for the * standard 24.576MHz. */ rate = parent_rate / 2; rate /= ((ac97_div >> 12) & 0x7fff); rate *= (ac97_div & 0xfff); return rate; } PARENTS(clk_pxa3xx_ac97) = { "spll_624mhz" }; RATE_RO_OPS(clk_pxa3xx_ac97, "ac97"); static unsigned long clk_pxa3xx_smemc_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long acsr = ACSR; unsigned long memclkcfg = __raw_readl(MEMCLKCFG); return (parent_rate / 48) * smcfs_mult[(acsr >> 23) & 0x7] / df_clkdiv[(memclkcfg >> 16) & 0x3]; } PARENTS(clk_pxa3xx_smemc) = { "spll_624mhz" }; RATE_RO_OPS(clk_pxa3xx_smemc, "smemc"); static bool pxa3xx_is_ring_osc_forced(void) { unsigned long acsr = ACSR; return acsr & ACCR_D0CS; } PARENTS(pxa3xx_pbus) = { "ring_osc_60mhz", "spll_624mhz" }; PARENTS(pxa3xx_32Khz_bus) = { "osc_32_768khz", "osc_32_768khz" }; PARENTS(pxa3xx_13MHz_bus) = { "osc_13mhz", "osc_13mhz" }; PARENTS(pxa3xx_ac97_bus) = { "ring_osc_60mhz", "ac97" }; PARENTS(pxa3xx_sbus) = { "ring_osc_60mhz", "system_bus" }; PARENTS(pxa3xx_smemcbus) = { "ring_osc_60mhz", "smemc" }; #define CKEN_AB(bit) ((CKEN_ ## bit > 31) ? &CKENA : &CKENB) #define PXA3XX_CKEN(dev_id, con_id, parents, mult_lp, div_lp, mult_hp, \ div_hp, bit, is_lp, flags) \ PXA_CKEN(dev_id, con_id, bit, parents, mult_lp, div_lp, \ mult_hp, div_hp, is_lp, CKEN_AB(bit), \ (CKEN_ ## bit % 32), flags) #define PXA3XX_PBUS_CKEN(dev_id, con_id, bit, mult_lp, div_lp, \ mult_hp, div_hp, delay) \ PXA3XX_CKEN(dev_id, con_id, pxa3xx_pbus_parents, mult_lp, \ div_lp, mult_hp, div_hp, bit, pxa3xx_is_ring_osc_forced, 0) #define PXA3XX_CKEN_1RATE(dev_id, con_id, bit, parents) \ PXA_CKEN_1RATE(dev_id, con_id, bit, parents, \ CKEN_AB(bit), (CKEN_ ## bit % 32), 0) static struct desc_clk_cken pxa3xx_clocks[] __initdata = { PXA3XX_PBUS_CKEN("pxa2xx-uart.0", NULL, FFUART, 1, 4, 1, 42, 1), PXA3XX_PBUS_CKEN("pxa2xx-uart.1", NULL, BTUART, 1, 4, 1, 42, 1), PXA3XX_PBUS_CKEN("pxa2xx-uart.2", NULL, STUART, 1, 4, 1, 42, 1), PXA3XX_PBUS_CKEN("pxa2xx-i2c.0", NULL, I2C, 2, 5, 1, 19, 0), PXA3XX_PBUS_CKEN("pxa27x-udc", NULL, UDC, 1, 4, 1, 13, 5), PXA3XX_PBUS_CKEN("pxa27x-ohci", NULL, USBH, 1, 4, 1, 13, 0), PXA3XX_PBUS_CKEN("pxa3xx-u2d", NULL, USB2, 1, 4, 1, 13, 0), PXA3XX_PBUS_CKEN("pxa27x-pwm.0", NULL, PWM0, 1, 6, 1, 48, 0), PXA3XX_PBUS_CKEN("pxa27x-pwm.1", NULL, PWM1, 1, 6, 1, 48, 0), PXA3XX_PBUS_CKEN("pxa2xx-mci.0", NULL, MMC1, 1, 4, 1, 24, 0), PXA3XX_PBUS_CKEN("pxa2xx-mci.1", NULL, MMC2, 1, 4, 1, 24, 0), PXA3XX_PBUS_CKEN("pxa2xx-mci.2", NULL, MMC3, 1, 4, 1, 24, 0), PXA3XX_CKEN_1RATE("pxa27x-keypad", NULL, KEYPAD, pxa3xx_32Khz_bus_parents), PXA3XX_CKEN_1RATE("pxa3xx-ssp.0", NULL, SSP1, pxa3xx_13MHz_bus_parents), PXA3XX_CKEN_1RATE("pxa3xx-ssp.1", NULL, SSP2, pxa3xx_13MHz_bus_parents), PXA3XX_CKEN_1RATE("pxa3xx-ssp.2", NULL, SSP3, pxa3xx_13MHz_bus_parents), PXA3XX_CKEN_1RATE("pxa3xx-ssp.3", NULL, SSP4, pxa3xx_13MHz_bus_parents), PXA3XX_CKEN(NULL, "AC97CLK", pxa3xx_ac97_bus_parents, 1, 4, 1, 1, AC97, pxa3xx_is_ring_osc_forced, 0), PXA3XX_CKEN(NULL, "CAMCLK", pxa3xx_sbus_parents, 1, 2, 1, 1, CAMERA, pxa3xx_is_ring_osc_forced, 0), PXA3XX_CKEN("pxa2xx-fb", NULL, pxa3xx_sbus_parents, 1, 1, 1, 1, LCD, pxa3xx_is_ring_osc_forced, 0), PXA3XX_CKEN("pxa2xx-pcmcia", NULL, pxa3xx_smemcbus_parents, 1, 4, 1, 1, SMC, pxa3xx_is_ring_osc_forced, CLK_IGNORE_UNUSED), }; static struct desc_clk_cken pxa300_310_clocks[] __initdata = { PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL, PXA300_GCU, 1, 1, 1, 1, 0), PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL, NAND, 1, 2, 1, 4, 0), PXA3XX_CKEN_1RATE("pxa3xx-gpio", NULL, GPIO, pxa3xx_13MHz_bus_parents), }; static struct desc_clk_cken pxa320_clocks[] __initdata = { PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL, NAND, 1, 2, 1, 6, 0), PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL, PXA320_GCU, 1, 1, 1, 1, 0), PXA3XX_CKEN_1RATE("pxa3xx-gpio", NULL, GPIO, pxa3xx_13MHz_bus_parents), }; static struct desc_clk_cken pxa93x_clocks[] __initdata = { PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL, PXA300_GCU, 1, 1, 1, 1, 0), PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL, NAND, 1, 2, 1, 4, 0), PXA3XX_CKEN_1RATE("pxa93x-gpio", NULL, GPIO, pxa3xx_13MHz_bus_parents), }; static unsigned long clk_pxa3xx_system_bus_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long acsr = ACSR; unsigned int hss = (acsr >> 14) & 0x3; if (pxa3xx_is_ring_osc_forced()) return parent_rate; return parent_rate / 48 * hss_mult[hss]; } static u8 clk_pxa3xx_system_bus_get_parent(struct clk_hw *hw) { if (pxa3xx_is_ring_osc_forced()) return PXA_BUS_60Mhz; else return PXA_BUS_HSS; } PARENTS(clk_pxa3xx_system_bus) = { "ring_osc_60mhz", "spll_624mhz" }; MUX_RO_RATE_RO_OPS(clk_pxa3xx_system_bus, "system_bus"); static unsigned long clk_pxa3xx_core_get_rate(struct clk_hw *hw, unsigned long parent_rate) { return parent_rate; } static u8 clk_pxa3xx_core_get_parent(struct clk_hw *hw) { unsigned long xclkcfg; unsigned int t; if (pxa3xx_is_ring_osc_forced()) return PXA_CORE_60Mhz; /* Read XCLKCFG register turbo bit */ __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); t = xclkcfg & 0x1; if (t) return PXA_CORE_TURBO; return PXA_CORE_RUN; } PARENTS(clk_pxa3xx_core) = { "ring_osc_60mhz", "run", "cpll" }; MUX_RO_RATE_RO_OPS(clk_pxa3xx_core, "core"); static unsigned long clk_pxa3xx_run_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long acsr = ACSR; unsigned int xn = (acsr & ACCR_XN_MASK) >> 8; unsigned int t, xclkcfg; /* Read XCLKCFG register turbo bit */ __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); t = xclkcfg & 0x1; return t ? (parent_rate / xn) * 2 : parent_rate; } PARENTS(clk_pxa3xx_run) = { "cpll" }; RATE_RO_OPS(clk_pxa3xx_run, "run"); static unsigned long clk_pxa3xx_cpll_get_rate(struct clk_hw *hw, unsigned long parent_rate) { unsigned long acsr = ACSR; unsigned int xn = (acsr & ACCR_XN_MASK) >> 8; unsigned int xl = acsr & ACCR_XL_MASK; unsigned int t, xclkcfg; /* Read XCLKCFG register turbo bit */ __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); t = xclkcfg & 0x1; pr_info("RJK: parent_rate=%lu, xl=%u, xn=%u\n", parent_rate, xl, xn); return t ? parent_rate * xl * xn : parent_rate * xl; } PARENTS(clk_pxa3xx_cpll) = { "osc_13mhz" }; RATE_RO_OPS(clk_pxa3xx_cpll, "cpll"); static void __init pxa3xx_register_core(void) { clk_register_clk_pxa3xx_cpll(); clk_register_clk_pxa3xx_run(); clkdev_pxa_register(CLK_CORE, "core", NULL, clk_register_clk_pxa3xx_core()); } static void __init pxa3xx_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); clk_register_fixed_rate(NULL, "ring_osc_120mhz", NULL, CLK_GET_RATE_NOCACHE | CLK_IS_ROOT, 120 * MHz); clk_register_fixed_rate(NULL, "clk_dummy", NULL, CLK_IS_ROOT, 0); clk_register_fixed_factor(NULL, "spll_624mhz", "osc_13mhz", 0, 48, 1); clk_register_fixed_factor(NULL, "ring_osc_60mhz", "ring_osc_120mhz", 0, 1, 2); } #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, "pxa93x-gpio", "osc_13mhz"), DUMMY_CLK(NULL, "sa1100-rtc", "osc_32_768khz"), DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"), DUMMY_CLK(NULL, "pxa3xx-pwri2c.1", "osc_13mhz"), }; static void __init pxa3xx_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 pxa3xx_base_clocks_init(void) { pxa3xx_register_plls(); pxa3xx_register_core(); clk_register_clk_pxa3xx_system_bus(); clk_register_clk_pxa3xx_ac97(); clk_register_clk_pxa3xx_smemc(); clk_register_gate(NULL, "CLK_POUT", "osc_13mhz", 0, (void __iomem *)&OSCC, 11, 0, NULL); clkdev_pxa_register(CLK_OSTIMER, "OSTIMER0", NULL, clk_register_fixed_factor(NULL, "os-timer0", "osc_13mhz", 0, 1, 4)); } int __init pxa3xx_clocks_init(void) { int ret; pxa3xx_base_clocks_init(); pxa3xx_dummy_clocks_init(); ret = clk_pxa_cken_init(pxa3xx_clocks, ARRAY_SIZE(pxa3xx_clocks)); if (ret) return ret; if (cpu_is_pxa320()) return clk_pxa_cken_init(pxa320_clocks, ARRAY_SIZE(pxa320_clocks)); if (cpu_is_pxa300() || cpu_is_pxa310()) return clk_pxa_cken_init(pxa300_310_clocks, ARRAY_SIZE(pxa300_310_clocks)); return clk_pxa_cken_init(pxa93x_clocks, ARRAY_SIZE(pxa93x_clocks)); } static void __init pxa3xx_dt_clocks_init(struct device_node *np) { pxa3xx_clocks_init(); clk_pxa_dt_common_init(np); } CLK_OF_DECLARE(pxa_clks, "marvell,pxa300-clocks", pxa3xx_dt_clocks_init);