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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Marvell PXA25x family clocks4 *5 * Copyright (C) 2014 Robert Jarzmik6 *7 * Heavily inspired from former arch/arm/mach-pxa/pxa25x.c.8 *9 * For non-devicetree platforms. Once pxa is fully converted to devicetree, this10 * should go away.11 */12#include <linux/clk-provider.h>13#include <linux/clk.h>14#include <linux/clk/pxa.h>15#include <linux/clkdev.h>16#include <linux/io.h>17#include <linux/of.h>18#include <linux/soc/pxa/smemc.h>19#include <linux/soc/pxa/cpu.h>20 21#include <dt-bindings/clock/pxa-clock.h>22#include "clk-pxa.h"23#include "clk-pxa2xx.h"24 25#define KHz 100026#define MHz (1000 * 1000)27 28enum {29	PXA_CORE_RUN = 0,30	PXA_CORE_TURBO,31};32 33#define PXA25x_CLKCFG(T)			\34	(CLKCFG_FCS |				\35	 ((T) ? CLKCFG_TURBO : 0))36#define PXA25x_CCCR(N2, M, L) (N2 << 7 | M << 5 | L)37 38/* Define the refresh period in mSec for the SDRAM and the number of rows */39#define SDRAM_TREF	64	/* standard 64ms SDRAM */40 41/*42 * Various clock factors driven by the CCCR register.43 */44static void __iomem *clk_regs;45 46/* Crystal Frequency to Memory Frequency Multiplier (L) */47static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };48 49/* Memory Frequency to Run Mode Frequency Multiplier (M) */50static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };51 52/* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */53/* Note: we store the value N * 2 here. */54static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };55 56static const char * const get_freq_khz[] = {57	"core", "run", "cpll", "memory"58};59 60static u32 mdrefr_dri(unsigned int freq_khz)61{62	u32 interval = freq_khz * SDRAM_TREF / pxa2xx_smemc_get_sdram_rows();63 64	return interval / 32;65}66 67/*68 * Get the clock frequency as reflected by CCCR and the turbo flag.69 * We assume these values have been applied via a fcs.70 * If info is not 0 we also display the current settings.71 */72unsigned int pxa25x_get_clk_frequency_khz(int info)73{74	struct clk *clk;75	unsigned long clks[5];76	int i;77 78	for (i = 0; i < ARRAY_SIZE(get_freq_khz); i++) {79		clk = clk_get(NULL, get_freq_khz[i]);80		if (IS_ERR(clk)) {81			clks[i] = 0;82		} else {83			clks[i] = clk_get_rate(clk);84			clk_put(clk);85		}86	}87 88	if (info) {89		pr_info("Run Mode clock: %ld.%02ldMHz\n",90			clks[1] / 1000000, (clks[1] % 1000000) / 10000);91		pr_info("Turbo Mode clock: %ld.%02ldMHz\n",92			clks[2] / 1000000, (clks[2] % 1000000) / 10000);93		pr_info("Memory clock: %ld.%02ldMHz\n",94			clks[3] / 1000000, (clks[3] % 1000000) / 10000);95	}96 97	return (unsigned int)clks[0] / KHz;98}99 100static unsigned long clk_pxa25x_memory_get_rate(struct clk_hw *hw,101						unsigned long parent_rate)102{103	unsigned long cccr = readl(clk_regs + CCCR);104	unsigned int m = M_clk_mult[(cccr >> 5) & 0x03];105 106	return parent_rate / m;107}108PARENTS(clk_pxa25x_memory) = { "run" };109RATE_RO_OPS(clk_pxa25x_memory, "memory");110 111PARENTS(pxa25x_pbus95) = { "ppll_95_85mhz", "ppll_95_85mhz" };112PARENTS(pxa25x_pbus147) = { "ppll_147_46mhz", "ppll_147_46mhz" };113PARENTS(pxa25x_osc3) = { "osc_3_6864mhz", "osc_3_6864mhz" };114 115#define PXA25X_CKEN(dev_id, con_id, parents, mult, div,			\116		    bit, is_lp, flags)					\117	PXA_CKEN(dev_id, con_id, bit, parents, mult, div, mult, div,	\118		 is_lp,  CKEN, CKEN_ ## bit, flags)119#define PXA25X_PBUS95_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay)	\120	PXA25X_CKEN(dev_id, con_id, pxa25x_pbus95_parents, mult_hp,	\121		    div_hp, bit, NULL, 0)122#define PXA25X_PBUS147_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay)\123	PXA25X_CKEN(dev_id, con_id, pxa25x_pbus147_parents, mult_hp,	\124		    div_hp, bit, NULL, 0)125#define PXA25X_OSC3_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay)	\126	PXA25X_CKEN(dev_id, con_id, pxa25x_osc3_parents, mult_hp,	\127		    div_hp, bit, NULL, 0)128 129#define PXA25X_CKEN_1RATE(dev_id, con_id, bit, parents, delay)		\130	PXA_CKEN_1RATE(dev_id, con_id, bit, parents,			\131		       CKEN, CKEN_ ## bit, 0)132#define PXA25X_CKEN_1RATE_AO(dev_id, con_id, bit, parents, delay)	\133	PXA_CKEN_1RATE(dev_id, con_id, bit, parents,			\134		       CKEN, CKEN_ ## bit, CLK_IGNORE_UNUSED)135 136static struct desc_clk_cken pxa25x_clocks[] __initdata = {137	PXA25X_PBUS95_CKEN("pxa2xx-mci.0", NULL, MMC, 1, 5, 0),138	PXA25X_PBUS95_CKEN("pxa2xx-i2c.0", NULL, I2C, 1, 3, 0),139	PXA25X_PBUS95_CKEN("pxa2xx-ir", "FICPCLK", FICP, 1, 2, 0),140	PXA25X_PBUS95_CKEN("pxa25x-udc", NULL, USB, 1, 2, 5),141	PXA25X_PBUS147_CKEN("pxa2xx-uart.0", NULL, FFUART, 1, 10, 1),142	PXA25X_PBUS147_CKEN("pxa2xx-uart.1", NULL, BTUART, 1, 10, 1),143	PXA25X_PBUS147_CKEN("pxa2xx-uart.2", NULL, STUART, 1, 10, 1),144	PXA25X_PBUS147_CKEN("pxa2xx-uart.3", NULL, HWUART, 1, 10, 1),145	PXA25X_PBUS147_CKEN("pxa2xx-i2s", NULL, I2S, 1, 10, 0),146	PXA25X_PBUS147_CKEN(NULL, "AC97CLK", AC97, 1, 12, 0),147	PXA25X_OSC3_CKEN("pxa25x-ssp.0", NULL, SSP, 1, 1, 0),148	PXA25X_OSC3_CKEN("pxa25x-nssp.1", NULL, NSSP, 1, 1, 0),149	PXA25X_OSC3_CKEN("pxa25x-nssp.2", NULL, ASSP, 1, 1, 0),150	PXA25X_OSC3_CKEN("pxa25x-pwm.0", NULL, PWM0, 1, 1, 0),151	PXA25X_OSC3_CKEN("pxa25x-pwm.1", NULL, PWM1, 1, 1, 0),152 153	PXA25X_CKEN_1RATE("pxa2xx-fb", NULL, LCD, clk_pxa25x_memory_parents, 0),154	PXA25X_CKEN_1RATE_AO("pxa2xx-pcmcia", NULL, MEMC,155			     clk_pxa25x_memory_parents, 0),156};157 158/*159 * In this table, PXA25x_CCCR(N2, M, L) has the following meaning, where :160 *   - freq_cpll = n * m * L * 3.6864 MHz161 *   - n = N2 / 2162 *   - m = 2^(M - 1), where 1 <= M <= 3163 *   - l = L_clk_mult[L], ie. { 0, 27, 32, 36, 40, 45, 0, }[L]164 */165static struct pxa2xx_freq pxa25x_freqs[] = {166	/* CPU  MEMBUS  CCCR                  DIV2 CCLKCFG      */167	{ 99532800, 99500, PXA25x_CCCR(2,  1, 1),  1, PXA25x_CLKCFG(1)},168	{199065600, 99500, PXA25x_CCCR(4,  1, 1),  0, PXA25x_CLKCFG(1)},169	{298598400, 99500, PXA25x_CCCR(3,  2, 1),  0, PXA25x_CLKCFG(1)},170	{398131200, 99500, PXA25x_CCCR(4,  2, 1),  0, PXA25x_CLKCFG(1)},171};172 173static u8 clk_pxa25x_core_get_parent(struct clk_hw *hw)174{175	unsigned long clkcfg;176	unsigned int t;177 178	asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));179	t  = clkcfg & (1 << 0);180	if (t)181		return PXA_CORE_TURBO;182	return PXA_CORE_RUN;183}184 185static int clk_pxa25x_core_set_parent(struct clk_hw *hw, u8 index)186{187	if (index > PXA_CORE_TURBO)188		return -EINVAL;189 190	pxa2xx_core_turbo_switch(index == PXA_CORE_TURBO);191 192	return 0;193}194 195static int clk_pxa25x_core_determine_rate(struct clk_hw *hw,196					  struct clk_rate_request *req)197{198	return __clk_mux_determine_rate(hw, req);199}200 201PARENTS(clk_pxa25x_core) = { "run", "cpll" };202MUX_OPS(clk_pxa25x_core, "core", CLK_SET_RATE_PARENT);203 204static unsigned long clk_pxa25x_run_get_rate(struct clk_hw *hw,205					     unsigned long parent_rate)206{207	unsigned long cccr = readl(clk_regs + CCCR);208	unsigned int n2 = N2_clk_mult[(cccr >> 7) & 0x07];209 210	return (parent_rate / n2) * 2;211}212PARENTS(clk_pxa25x_run) = { "cpll" };213RATE_RO_OPS(clk_pxa25x_run, "run");214 215static unsigned long clk_pxa25x_cpll_get_rate(struct clk_hw *hw,216	unsigned long parent_rate)217{218	unsigned long clkcfg, cccr = readl(clk_regs + CCCR);219	unsigned int l, m, n2, t;220 221	asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));222	t = clkcfg & (1 << 0);223	l  =  L_clk_mult[(cccr >> 0) & 0x1f];224	m = M_clk_mult[(cccr >> 5) & 0x03];225	n2 = N2_clk_mult[(cccr >> 7) & 0x07];226 227	return m * l * n2 * parent_rate / 2;228}229 230static int clk_pxa25x_cpll_determine_rate(struct clk_hw *hw,231					  struct clk_rate_request *req)232{233	return pxa2xx_determine_rate(req, pxa25x_freqs,234				     ARRAY_SIZE(pxa25x_freqs));235}236 237static int clk_pxa25x_cpll_set_rate(struct clk_hw *hw, unsigned long rate,238				    unsigned long parent_rate)239{240	int i;241 242	pr_debug("%s(rate=%lu parent_rate=%lu)\n", __func__, rate, parent_rate);243	for (i = 0; i < ARRAY_SIZE(pxa25x_freqs); i++)244		if (pxa25x_freqs[i].cpll == rate)245			break;246 247	if (i >= ARRAY_SIZE(pxa25x_freqs))248		return -EINVAL;249 250	pxa2xx_cpll_change(&pxa25x_freqs[i], mdrefr_dri, clk_regs + CCCR);251 252	return 0;253}254PARENTS(clk_pxa25x_cpll) = { "osc_3_6864mhz" };255RATE_OPS(clk_pxa25x_cpll, "cpll");256 257static void __init pxa25x_register_core(void)258{259	clkdev_pxa_register(CLK_NONE, "cpll", NULL,260			    clk_register_clk_pxa25x_cpll());261	clkdev_pxa_register(CLK_NONE, "run", NULL,262			    clk_register_clk_pxa25x_run());263	clkdev_pxa_register(CLK_CORE, "core", NULL,264			    clk_register_clk_pxa25x_core());265}266 267static void __init pxa25x_register_plls(void)268{269	clk_register_fixed_rate(NULL, "osc_3_6864mhz", NULL,270				CLK_GET_RATE_NOCACHE, 3686400);271	clkdev_pxa_register(CLK_OSC32k768, "osc_32_768khz", NULL,272			    clk_register_fixed_rate(NULL, "osc_32_768khz", NULL,273						    CLK_GET_RATE_NOCACHE,274						    32768));275	clk_register_fixed_rate(NULL, "clk_dummy", NULL, 0, 0);276	clk_register_fixed_factor(NULL, "ppll_95_85mhz", "osc_3_6864mhz",277				  0, 26, 1);278	clk_register_fixed_factor(NULL, "ppll_147_46mhz", "osc_3_6864mhz",279				  0, 40, 1);280}281 282static void __init pxa25x_base_clocks_init(void)283{284	pxa25x_register_plls();285	pxa25x_register_core();286	clkdev_pxa_register(CLK_NONE, "system_bus", NULL,287			    clk_register_clk_pxa25x_memory());288}289 290#define DUMMY_CLK(_con_id, _dev_id, _parent) \291	{ .con_id = _con_id, .dev_id = _dev_id, .parent = _parent }292struct dummy_clk {293	const char *con_id;294	const char *dev_id;295	const char *parent;296};297static struct dummy_clk dummy_clks[] __initdata = {298	DUMMY_CLK(NULL, "pxa25x-gpio", "osc_32_768khz"),299	DUMMY_CLK(NULL, "pxa26x-gpio", "osc_32_768khz"),300	DUMMY_CLK("GPIO11_CLK", NULL, "osc_3_6864mhz"),301	DUMMY_CLK("GPIO12_CLK", NULL, "osc_32_768khz"),302	DUMMY_CLK(NULL, "sa1100-rtc", "osc_32_768khz"),303	DUMMY_CLK("OSTIMER0", NULL, "osc_3_6864mhz"),304	DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"),305};306 307static void __init pxa25x_dummy_clocks_init(void)308{309	struct clk *clk;310	struct dummy_clk *d;311	const char *name;312	int i;313 314	/*315	 * All pinctrl logic has been wiped out of the clock driver, especially316	 * for gpio11 and gpio12 outputs. Machine code should ensure proper pin317	 * control (ie. pxa2xx_mfp_config() invocation).318	 */319	for (i = 0; i < ARRAY_SIZE(dummy_clks); i++) {320		d = &dummy_clks[i];321		name = d->dev_id ? d->dev_id : d->con_id;322		clk = clk_register_fixed_factor(NULL, name, d->parent, 0, 1, 1);323		clk_register_clkdev(clk, d->con_id, d->dev_id);324	}325}326 327int __init pxa25x_clocks_init(void __iomem *regs)328{329	clk_regs = regs;330	pxa25x_base_clocks_init();331	pxa25x_dummy_clocks_init();332	return clk_pxa_cken_init(pxa25x_clocks, ARRAY_SIZE(pxa25x_clocks), clk_regs);333}334 335static void __init pxa25x_dt_clocks_init(struct device_node *np)336{337	pxa25x_clocks_init(ioremap(0x41300000ul, 0x10));338	clk_pxa_dt_common_init(np);339}340CLK_OF_DECLARE(pxa25x_clks, "marvell,pxa250-core-clocks",341	       pxa25x_dt_clocks_init);342