1/* 2 * Copyright 2012 Freescale Semiconductor, Inc. 3 * 4 * The code contained herein is licensed under the GNU General Public 5 * License. You may obtain a copy of the GNU General Public License 6 * Version 2 or later at the following locations: 7 * 8 * http://www.opensource.org/licenses/gpl-license.html 9 * http://www.gnu.org/copyleft/gpl.html 10 */ 11 12#include <linux/clk/mxs.h> 13#include <linux/clkdev.h> 14#include <linux/clk.h> 15#include <linux/clk-provider.h> 16#include <linux/err.h> 17#include <linux/init.h> 18#include <linux/io.h> 19#include <linux/of.h> 20#include <linux/of_address.h> 21#include "clk.h" 22 23static void __iomem *clkctrl; 24#define CLKCTRL clkctrl 25 26#define PLL0CTRL0 (CLKCTRL + 0x0000) 27#define PLL1CTRL0 (CLKCTRL + 0x0020) 28#define PLL2CTRL0 (CLKCTRL + 0x0040) 29#define CPU (CLKCTRL + 0x0050) 30#define HBUS (CLKCTRL + 0x0060) 31#define XBUS (CLKCTRL + 0x0070) 32#define XTAL (CLKCTRL + 0x0080) 33#define SSP0 (CLKCTRL + 0x0090) 34#define SSP1 (CLKCTRL + 0x00a0) 35#define SSP2 (CLKCTRL + 0x00b0) 36#define SSP3 (CLKCTRL + 0x00c0) 37#define GPMI (CLKCTRL + 0x00d0) 38#define SPDIF (CLKCTRL + 0x00e0) 39#define EMI (CLKCTRL + 0x00f0) 40#define SAIF0 (CLKCTRL + 0x0100) 41#define SAIF1 (CLKCTRL + 0x0110) 42#define LCDIF (CLKCTRL + 0x0120) 43#define ETM (CLKCTRL + 0x0130) 44#define ENET (CLKCTRL + 0x0140) 45#define FLEXCAN (CLKCTRL + 0x0160) 46#define FRAC0 (CLKCTRL + 0x01b0) 47#define FRAC1 (CLKCTRL + 0x01c0) 48#define CLKSEQ (CLKCTRL + 0x01d0) 49 50#define BP_CPU_INTERRUPT_WAIT 12 51#define BP_SAIF_DIV_FRAC_EN 16 52#define BP_ENET_DIV_TIME 21 53#define BP_ENET_SLEEP 31 54#define BP_CLKSEQ_BYPASS_SAIF0 0 55#define BP_CLKSEQ_BYPASS_SSP0 3 56#define BP_FRAC0_IO1FRAC 16 57#define BP_FRAC0_IO0FRAC 24 58 59static void __iomem *digctrl; 60#define DIGCTRL digctrl 61#define BP_SAIF_CLKMUX 10 62 63/* 64 * HW_SAIF_CLKMUX_SEL: 65 * DIRECT(0x0): SAIF0 clock pins selected for SAIF0 input clocks, and SAIF1 66 * clock pins selected for SAIF1 input clocks. 67 * CROSSINPUT(0x1): SAIF1 clock inputs selected for SAIF0 input clocks, and 68 * SAIF0 clock inputs selected for SAIF1 input clocks. 69 * EXTMSTR0(0x2): SAIF0 clock pin selected for both SAIF0 and SAIF1 input 70 * clocks. 71 * EXTMSTR1(0x3): SAIF1 clock pin selected for both SAIF0 and SAIF1 input 72 * clocks. 73 */ 74int mxs_saif_clkmux_select(unsigned int clkmux) 75{ 76 if (clkmux > 0x3) 77 return -EINVAL; 78 79 writel_relaxed(0x3 << BP_SAIF_CLKMUX, DIGCTRL + CLR); 80 writel_relaxed(clkmux << BP_SAIF_CLKMUX, DIGCTRL + SET); 81 82 return 0; 83} 84 85static void __init clk_misc_init(void) 86{ 87 u32 val; 88 89 /* Gate off cpu clock in WFI for power saving */ 90 writel_relaxed(1 << BP_CPU_INTERRUPT_WAIT, CPU + SET); 91 92 /* 0 is a bad default value for a divider */ 93 writel_relaxed(1 << BP_ENET_DIV_TIME, ENET + SET); 94 95 /* Clear BYPASS for SAIF */ 96 writel_relaxed(0x3 << BP_CLKSEQ_BYPASS_SAIF0, CLKSEQ + CLR); 97 98 /* SAIF has to use frac div for functional operation */ 99 val = readl_relaxed(SAIF0); 100 val |= 1 << BP_SAIF_DIV_FRAC_EN; 101 writel_relaxed(val, SAIF0); 102 103 val = readl_relaxed(SAIF1); 104 val |= 1 << BP_SAIF_DIV_FRAC_EN; 105 writel_relaxed(val, SAIF1); 106 107 /* Extra fec clock setting */ 108 val = readl_relaxed(ENET); 109 val &= ~(1 << BP_ENET_SLEEP); 110 writel_relaxed(val, ENET); 111 112 /* 113 * Source ssp clock from ref_io than ref_xtal, 114 * as ref_xtal only provides 24 MHz as maximum. 115 */ 116 writel_relaxed(0xf << BP_CLKSEQ_BYPASS_SSP0, CLKSEQ + CLR); 117 118 /* 119 * 480 MHz seems too high to be ssp clock source directly, 120 * so set frac0 to get a 288 MHz ref_io0 and ref_io1. 121 */ 122 val = readl_relaxed(FRAC0); 123 val &= ~((0x3f << BP_FRAC0_IO0FRAC) | (0x3f << BP_FRAC0_IO1FRAC)); 124 val |= (30 << BP_FRAC0_IO0FRAC) | (30 << BP_FRAC0_IO1FRAC); 125 writel_relaxed(val, FRAC0); 126} 127 128static const char *const sel_cpu[] __initconst = { "ref_cpu", "ref_xtal", }; 129static const char *const sel_io0[] __initconst = { "ref_io0", "ref_xtal", }; 130static const char *const sel_io1[] __initconst = { "ref_io1", "ref_xtal", }; 131static const char *const sel_pix[] __initconst = { "ref_pix", "ref_xtal", }; 132static const char *const sel_gpmi[] __initconst = { "ref_gpmi", "ref_xtal", }; 133static const char *const sel_pll0[] __initconst = { "pll0", "ref_xtal", }; 134static const char *const cpu_sels[] __initconst = { "cpu_pll", "cpu_xtal", }; 135static const char *const emi_sels[] __initconst = { "emi_pll", "emi_xtal", }; 136static const char *const ptp_sels[] __initconst = { "ref_xtal", "pll0", }; 137 138enum imx28_clk { 139 ref_xtal, pll0, pll1, pll2, ref_cpu, ref_emi, ref_io0, ref_io1, 140 ref_pix, ref_hsadc, ref_gpmi, saif0_sel, saif1_sel, gpmi_sel, 141 ssp0_sel, ssp1_sel, ssp2_sel, ssp3_sel, emi_sel, etm_sel, 142 lcdif_sel, cpu, ptp_sel, cpu_pll, cpu_xtal, hbus, xbus, 143 ssp0_div, ssp1_div, ssp2_div, ssp3_div, gpmi_div, emi_pll, 144 emi_xtal, lcdif_div, etm_div, ptp, saif0_div, saif1_div, 145 clk32k_div, rtc, lradc, spdif_div, clk32k, pwm, uart, ssp0, 146 ssp1, ssp2, ssp3, gpmi, spdif, emi, saif0, saif1, lcdif, etm, 147 fec, can0, can1, usb0, usb1, usb0_phy, usb1_phy, enet_out, 148 clk_max 149}; 150 151static struct clk *clks[clk_max]; 152static struct clk_onecell_data clk_data; 153 154static enum imx28_clk clks_init_on[] __initdata = { 155 cpu, hbus, xbus, emi, uart, 156}; 157 158static void __init mx28_clocks_init(struct device_node *np) 159{ 160 struct device_node *dcnp; 161 u32 i; 162 163 dcnp = of_find_compatible_node(NULL, NULL, "fsl,imx28-digctl"); 164 digctrl = of_iomap(dcnp, 0); 165 WARN_ON(!digctrl); 166 of_node_put(dcnp); 167 168 clkctrl = of_iomap(np, 0); 169 WARN_ON(!clkctrl); 170 171 clk_misc_init(); 172 173 clks[ref_xtal] = mxs_clk_fixed("ref_xtal", 24000000); 174 clks[pll0] = mxs_clk_pll("pll0", "ref_xtal", PLL0CTRL0, 17, 480000000); 175 clks[pll1] = mxs_clk_pll("pll1", "ref_xtal", PLL1CTRL0, 17, 480000000); 176 clks[pll2] = mxs_clk_pll("pll2", "ref_xtal", PLL2CTRL0, 23, 50000000); 177 clks[ref_cpu] = mxs_clk_ref("ref_cpu", "pll0", FRAC0, 0); 178 clks[ref_emi] = mxs_clk_ref("ref_emi", "pll0", FRAC0, 1); 179 clks[ref_io1] = mxs_clk_ref("ref_io1", "pll0", FRAC0, 2); 180 clks[ref_io0] = mxs_clk_ref("ref_io0", "pll0", FRAC0, 3); 181 clks[ref_pix] = mxs_clk_ref("ref_pix", "pll0", FRAC1, 0); 182 clks[ref_hsadc] = mxs_clk_ref("ref_hsadc", "pll0", FRAC1, 1); 183 clks[ref_gpmi] = mxs_clk_ref("ref_gpmi", "pll0", FRAC1, 2); 184 clks[saif0_sel] = mxs_clk_mux("saif0_sel", CLKSEQ, 0, 1, sel_pll0, ARRAY_SIZE(sel_pll0)); 185 clks[saif1_sel] = mxs_clk_mux("saif1_sel", CLKSEQ, 1, 1, sel_pll0, ARRAY_SIZE(sel_pll0)); 186 clks[gpmi_sel] = mxs_clk_mux("gpmi_sel", CLKSEQ, 2, 1, sel_gpmi, ARRAY_SIZE(sel_gpmi)); 187 clks[ssp0_sel] = mxs_clk_mux("ssp0_sel", CLKSEQ, 3, 1, sel_io0, ARRAY_SIZE(sel_io0)); 188 clks[ssp1_sel] = mxs_clk_mux("ssp1_sel", CLKSEQ, 4, 1, sel_io0, ARRAY_SIZE(sel_io0)); 189 clks[ssp2_sel] = mxs_clk_mux("ssp2_sel", CLKSEQ, 5, 1, sel_io1, ARRAY_SIZE(sel_io1)); 190 clks[ssp3_sel] = mxs_clk_mux("ssp3_sel", CLKSEQ, 6, 1, sel_io1, ARRAY_SIZE(sel_io1)); 191 clks[emi_sel] = mxs_clk_mux("emi_sel", CLKSEQ, 7, 1, emi_sels, ARRAY_SIZE(emi_sels)); 192 clks[etm_sel] = mxs_clk_mux("etm_sel", CLKSEQ, 8, 1, sel_cpu, ARRAY_SIZE(sel_cpu)); 193 clks[lcdif_sel] = mxs_clk_mux("lcdif_sel", CLKSEQ, 14, 1, sel_pix, ARRAY_SIZE(sel_pix)); 194 clks[cpu] = mxs_clk_mux("cpu", CLKSEQ, 18, 1, cpu_sels, ARRAY_SIZE(cpu_sels)); 195 clks[ptp_sel] = mxs_clk_mux("ptp_sel", ENET, 19, 1, ptp_sels, ARRAY_SIZE(ptp_sels)); 196 clks[cpu_pll] = mxs_clk_div("cpu_pll", "ref_cpu", CPU, 0, 6, 28); 197 clks[cpu_xtal] = mxs_clk_div("cpu_xtal", "ref_xtal", CPU, 16, 10, 29); 198 clks[hbus] = mxs_clk_div("hbus", "cpu", HBUS, 0, 5, 31); 199 clks[xbus] = mxs_clk_div("xbus", "ref_xtal", XBUS, 0, 10, 31); 200 clks[ssp0_div] = mxs_clk_div("ssp0_div", "ssp0_sel", SSP0, 0, 9, 29); 201 clks[ssp1_div] = mxs_clk_div("ssp1_div", "ssp1_sel", SSP1, 0, 9, 29); 202 clks[ssp2_div] = mxs_clk_div("ssp2_div", "ssp2_sel", SSP2, 0, 9, 29); 203 clks[ssp3_div] = mxs_clk_div("ssp3_div", "ssp3_sel", SSP3, 0, 9, 29); 204 clks[gpmi_div] = mxs_clk_div("gpmi_div", "gpmi_sel", GPMI, 0, 10, 29); 205 clks[emi_pll] = mxs_clk_div("emi_pll", "ref_emi", EMI, 0, 6, 28); 206 clks[emi_xtal] = mxs_clk_div("emi_xtal", "ref_xtal", EMI, 8, 4, 29); 207 clks[lcdif_div] = mxs_clk_div("lcdif_div", "lcdif_sel", LCDIF, 0, 13, 29); 208 clks[etm_div] = mxs_clk_div("etm_div", "etm_sel", ETM, 0, 7, 29); 209 clks[ptp] = mxs_clk_div("ptp", "ptp_sel", ENET, 21, 6, 27); 210 clks[saif0_div] = mxs_clk_frac("saif0_div", "saif0_sel", SAIF0, 0, 16, 29); 211 clks[saif1_div] = mxs_clk_frac("saif1_div", "saif1_sel", SAIF1, 0, 16, 29); 212 clks[clk32k_div] = mxs_clk_fixed_factor("clk32k_div", "ref_xtal", 1, 750); 213 clks[rtc] = mxs_clk_fixed_factor("rtc", "ref_xtal", 1, 768); 214 clks[lradc] = mxs_clk_fixed_factor("lradc", "clk32k", 1, 16); 215 clks[spdif_div] = mxs_clk_fixed_factor("spdif_div", "pll0", 1, 4); 216 clks[clk32k] = mxs_clk_gate("clk32k", "clk32k_div", XTAL, 26); 217 clks[pwm] = mxs_clk_gate("pwm", "ref_xtal", XTAL, 29); 218 clks[uart] = mxs_clk_gate("uart", "ref_xtal", XTAL, 31); 219 clks[ssp0] = mxs_clk_gate("ssp0", "ssp0_div", SSP0, 31); 220 clks[ssp1] = mxs_clk_gate("ssp1", "ssp1_div", SSP1, 31); 221 clks[ssp2] = mxs_clk_gate("ssp2", "ssp2_div", SSP2, 31); 222 clks[ssp3] = mxs_clk_gate("ssp3", "ssp3_div", SSP3, 31); 223 clks[gpmi] = mxs_clk_gate("gpmi", "gpmi_div", GPMI, 31); 224 clks[spdif] = mxs_clk_gate("spdif", "spdif_div", SPDIF, 31); 225 clks[emi] = mxs_clk_gate("emi", "emi_sel", EMI, 31); 226 clks[saif0] = mxs_clk_gate("saif0", "saif0_div", SAIF0, 31); 227 clks[saif1] = mxs_clk_gate("saif1", "saif1_div", SAIF1, 31); 228 clks[lcdif] = mxs_clk_gate("lcdif", "lcdif_div", LCDIF, 31); 229 clks[etm] = mxs_clk_gate("etm", "etm_div", ETM, 31); 230 clks[fec] = mxs_clk_gate("fec", "hbus", ENET, 30); 231 clks[can0] = mxs_clk_gate("can0", "ref_xtal", FLEXCAN, 30); 232 clks[can1] = mxs_clk_gate("can1", "ref_xtal", FLEXCAN, 28); 233 clks[usb0] = mxs_clk_gate("usb0", "usb0_phy", DIGCTRL, 2); 234 clks[usb1] = mxs_clk_gate("usb1", "usb1_phy", DIGCTRL, 16); 235 clks[usb0_phy] = clk_register_gate(NULL, "usb0_phy", "pll0", 0, PLL0CTRL0, 18, 0, &mxs_lock); 236 clks[usb1_phy] = clk_register_gate(NULL, "usb1_phy", "pll1", 0, PLL1CTRL0, 18, 0, &mxs_lock); 237 clks[enet_out] = clk_register_gate(NULL, "enet_out", "pll2", 0, ENET, 18, 0, &mxs_lock); 238 239 for (i = 0; i < ARRAY_SIZE(clks); i++) 240 if (IS_ERR(clks[i])) { 241 pr_err("i.MX28 clk %d: register failed with %ld\n", 242 i, PTR_ERR(clks[i])); 243 return; 244 } 245 246 clk_data.clks = clks; 247 clk_data.clk_num = ARRAY_SIZE(clks); 248 of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); 249 250 clk_register_clkdev(clks[enet_out], NULL, "enet_out"); 251 252 for (i = 0; i < ARRAY_SIZE(clks_init_on); i++) 253 clk_prepare_enable(clks[clks_init_on[i]]); 254} 255CLK_OF_DECLARE(imx28_clkctrl, "fsl,imx28-clkctrl", mx28_clocks_init); 256