diff options
Diffstat (limited to 'drivers/clk/pxa/clk-pxa27x.c')
| -rw-r--r-- | drivers/clk/pxa/clk-pxa27x.c | 509 |
1 files changed, 509 insertions, 0 deletions
diff --git a/drivers/clk/pxa/clk-pxa27x.c b/drivers/clk/pxa/clk-pxa27x.c new file mode 100644 index 000000000..b44c4cf80 --- /dev/null +++ b/drivers/clk/pxa/clk-pxa27x.c @@ -0,0 +1,509 @@ +/* + * 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 <linux/clk-provider.h> +#include <mach/pxa2xx-regs.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/clkdev.h> +#include <linux/of.h> + +#include <mach/smemc.h> + +#include <dt-bindings/clock/pxa-clock.h> +#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); |