drivers/clk/imx/clk-imx25.c

   1 /*
   2  * Copyright (C) 2009 by Sascha Hauer, Pengutronix
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  16  * MA 02110-1301, USA.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/list.h>
  22 #include <linux/clk.h>
  23 #include <linux/io.h>
  24 #include <linux/clkdev.h>
  25 #include <linux/err.h>
  26 #include <linux/of.h>
  27 #include <linux/of_address.h>
  28 #include <linux/of_irq.h>
  29
  30 #include "clk.h"
  31
  32 #define CCM_MPCTL       0x00
  33 #define CCM_UPCTL       0x04
  34 #define CCM_CCTL        0x08
  35 #define CCM_CGCR0       0x0C
  36 #define CCM_CGCR1       0x10
  37 #define CCM_CGCR2       0x14
  38 #define CCM_PCDR0       0x18
  39 #define CCM_PCDR1       0x1C
  40 #define CCM_PCDR2       0x20
  41 #define CCM_PCDR3       0x24
  42 #define CCM_RCSR        0x28
  43 #define CCM_CRDR        0x2C
  44 #define CCM_DCVR0       0x30
  45 #define CCM_DCVR1       0x34
  46 #define CCM_DCVR2       0x38
  47 #define CCM_DCVR3       0x3c
  48 #define CCM_LTR0        0x40
  49 #define CCM_LTR1        0x44
  50 #define CCM_LTR2        0x48
  51 #define CCM_LTR3        0x4c
  52 #define CCM_MCR         0x64
  53
  54 #define ccm(x)  (ccm_base + (x))
  55
  56 static struct clk_onecell_data clk_data;
  57
  58 static const char *cpu_sel_clks[] = { "mpll", "mpll_cpu_3_4", };
  59 static const char *per_sel_clks[] = { "ahb", "upll", };
  60 static const char *cko_sel_clks[] = { "dummy", "osc", "cpu", "ahb",
  61                                       "ipg", "dummy", "dummy", "dummy",
  62                                       "dummy", "dummy", "per0", "per2",
  63                                       "per13", "per14", "usbotg_ahb", "dummy",};
  64
  65 enum mx25_clks {
  66         dummy, osc, mpll, upll, mpll_cpu_3_4, cpu_sel, cpu, ahb, usb_div, ipg,
  67         per0_sel, per1_sel, per2_sel, per3_sel, per4_sel, per5_sel, per6_sel,
  68         per7_sel, per8_sel, per9_sel, per10_sel, per11_sel, per12_sel,
  69         per13_sel, per14_sel, per15_sel, per0, per1, per2, per3, per4, per5,
  70         per6, per7, per8, per9, per10, per11, per12, per13, per14, per15,
  71         csi_ipg_per, epit_ipg_per, esai_ipg_per, esdhc1_ipg_per, esdhc2_ipg_per,
  72         gpt_ipg_per, i2c_ipg_per, lcdc_ipg_per, nfc_ipg_per, owire_ipg_per,
  73         pwm_ipg_per, sim1_ipg_per, sim2_ipg_per, ssi1_ipg_per, ssi2_ipg_per,
  74         uart_ipg_per, ata_ahb, reserved1, csi_ahb, emi_ahb, esai_ahb, esdhc1_ahb,
  75         esdhc2_ahb, fec_ahb, lcdc_ahb, rtic_ahb, sdma_ahb, slcdc_ahb, usbotg_ahb,
  76         reserved2, reserved3, reserved4, reserved5, can1_ipg, can2_ipg, csi_ipg,
  77         cspi1_ipg, cspi2_ipg, cspi3_ipg, dryice_ipg, ect_ipg, epit1_ipg, epit2_ipg,
  78         reserved6, esdhc1_ipg, esdhc2_ipg, fec_ipg, reserved7, reserved8, reserved9,
  79         gpt1_ipg, gpt2_ipg, gpt3_ipg, gpt4_ipg, reserved10, reserved11, reserved12,
  80         iim_ipg, reserved13, reserved14, kpp_ipg, lcdc_ipg, reserved15, pwm1_ipg,
  81         pwm2_ipg, pwm3_ipg, pwm4_ipg, rngb_ipg, reserved16, scc_ipg, sdma_ipg,
  82         sim1_ipg, sim2_ipg, slcdc_ipg, spba_ipg, ssi1_ipg, ssi2_ipg, tsc_ipg,
  83         uart1_ipg, uart2_ipg, uart3_ipg, uart4_ipg, uart5_ipg, reserved17,
  84         wdt_ipg, cko_div, cko_sel, cko, clk_max
  85 };
  86
  87 static struct clk *clk[clk_max];
  88
  89 static struct clk ** const uart_clks[] __initconst = {
  90         &clk[uart_ipg_per],
  91         &clk[uart1_ipg],
  92         &clk[uart2_ipg],
  93         &clk[uart3_ipg],
  94         &clk[uart4_ipg],
  95         &clk[uart5_ipg],
  96         NULL
  97 };
  98
  99 static int __init __mx25_clocks_init(unsigned long osc_rate,
 100                                      void __iomem *ccm_base)
 101 {
 102         BUG_ON(!ccm_base);
 103
 104         clk[dummy] = imx_clk_fixed("dummy", 0);
 105         clk[osc] = imx_clk_fixed("osc", osc_rate);
 106         clk[mpll] = imx_clk_pllv1(IMX_PLLV1_IMX25, "mpll", "osc", ccm(CCM_MPCTL));
 107         clk[upll] = imx_clk_pllv1(IMX_PLLV1_IMX25, "upll", "osc", ccm(CCM_UPCTL));
 108         clk[mpll_cpu_3_4] = imx_clk_fixed_factor("mpll_cpu_3_4", "mpll", 3, 4);
 109         clk[cpu_sel] = imx_clk_mux("cpu_sel", ccm(CCM_CCTL), 14, 1, cpu_sel_clks, ARRAY_SIZE(cpu_sel_clks));
 110         clk[cpu] = imx_clk_divider("cpu", "cpu_sel", ccm(CCM_CCTL), 30, 2);
 111         clk[ahb] = imx_clk_divider("ahb", "cpu", ccm(CCM_CCTL), 28, 2);
 112         clk[usb_div] = imx_clk_divider("usb_div", "upll", ccm(CCM_CCTL), 16, 6);
 113         clk[ipg] = imx_clk_fixed_factor("ipg", "ahb", 1, 2);
 114         clk[per0_sel] = imx_clk_mux("per0_sel", ccm(CCM_MCR), 0, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 115         clk[per1_sel] = imx_clk_mux("per1_sel", ccm(CCM_MCR), 1, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 116         clk[per2_sel] = imx_clk_mux("per2_sel", ccm(CCM_MCR), 2, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 117         clk[per3_sel] = imx_clk_mux("per3_sel", ccm(CCM_MCR), 3, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 118         clk[per4_sel] = imx_clk_mux("per4_sel", ccm(CCM_MCR), 4, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 119         clk[per5_sel] = imx_clk_mux("per5_sel", ccm(CCM_MCR), 5, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 120         clk[per6_sel] = imx_clk_mux("per6_sel", ccm(CCM_MCR), 6, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 121         clk[per7_sel] = imx_clk_mux("per7_sel", ccm(CCM_MCR), 7, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 122         clk[per8_sel] = imx_clk_mux("per8_sel", ccm(CCM_MCR), 8, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 123         clk[per9_sel] = imx_clk_mux("per9_sel", ccm(CCM_MCR), 9, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 124         clk[per10_sel] = imx_clk_mux("per10_sel", ccm(CCM_MCR), 10, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 125         clk[per11_sel] = imx_clk_mux("per11_sel", ccm(CCM_MCR), 11, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 126         clk[per12_sel] = imx_clk_mux("per12_sel", ccm(CCM_MCR), 12, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 127         clk[per13_sel] = imx_clk_mux("per13_sel", ccm(CCM_MCR), 13, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 128         clk[per14_sel] = imx_clk_mux("per14_sel", ccm(CCM_MCR), 14, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 129         clk[per15_sel] = imx_clk_mux("per15_sel", ccm(CCM_MCR), 15, 1, per_sel_clks, ARRAY_SIZE(per_sel_clks));
 130         clk[cko_div] = imx_clk_divider("cko_div", "cko_sel", ccm(CCM_MCR), 24, 6);
 131         clk[cko_sel] = imx_clk_mux("cko_sel", ccm(CCM_MCR), 20, 4, cko_sel_clks, ARRAY_SIZE(cko_sel_clks));
 132         clk[cko] = imx_clk_gate("cko", "cko_div", ccm(CCM_MCR),  30);
 133         clk[per0] = imx_clk_divider("per0", "per0_sel", ccm(CCM_PCDR0), 0, 6);
 134         clk[per1] = imx_clk_divider("per1", "per1_sel", ccm(CCM_PCDR0), 8, 6);
 135         clk[per2] = imx_clk_divider("per2", "per2_sel", ccm(CCM_PCDR0), 16, 6);
 136         clk[per3] = imx_clk_divider("per3", "per3_sel", ccm(CCM_PCDR0), 24, 6);
 137         clk[per4] = imx_clk_divider("per4", "per4_sel", ccm(CCM_PCDR1), 0, 6);
 138         clk[per5] = imx_clk_divider("per5", "per5_sel", ccm(CCM_PCDR1), 8, 6);
 139         clk[per6] = imx_clk_divider("per6", "per6_sel", ccm(CCM_PCDR1), 16, 6);
 140         clk[per7] = imx_clk_divider("per7", "per7_sel", ccm(CCM_PCDR1), 24, 6);
 141         clk[per8] = imx_clk_divider("per8", "per8_sel", ccm(CCM_PCDR2), 0, 6);
 142         clk[per9] = imx_clk_divider("per9", "per9_sel", ccm(CCM_PCDR2), 8, 6);
 143         clk[per10] = imx_clk_divider("per10", "per10_sel", ccm(CCM_PCDR2), 16, 6);
 144         clk[per11] = imx_clk_divider("per11", "per11_sel", ccm(CCM_PCDR2), 24, 6);
 145         clk[per12] = imx_clk_divider("per12", "per12_sel", ccm(CCM_PCDR3), 0, 6);
 146         clk[per13] = imx_clk_divider("per13", "per13_sel", ccm(CCM_PCDR3), 8, 6);
 147         clk[per14] = imx_clk_divider("per14", "per14_sel", ccm(CCM_PCDR3), 16, 6);
 148         clk[per15] = imx_clk_divider("per15", "per15_sel", ccm(CCM_PCDR3), 24, 6);
 149         clk[csi_ipg_per] = imx_clk_gate("csi_ipg_per", "per0", ccm(CCM_CGCR0), 0);
 150         clk[epit_ipg_per] = imx_clk_gate("epit_ipg_per", "per1", ccm(CCM_CGCR0),  1);
 151         clk[esai_ipg_per] = imx_clk_gate("esai_ipg_per", "per2", ccm(CCM_CGCR0),  2);
 152         clk[esdhc1_ipg_per] = imx_clk_gate("esdhc1_ipg_per", "per3", ccm(CCM_CGCR0),  3);
 153         clk[esdhc2_ipg_per] = imx_clk_gate("esdhc2_ipg_per", "per4", ccm(CCM_CGCR0),  4);
 154         clk[gpt_ipg_per] = imx_clk_gate("gpt_ipg_per", "per5", ccm(CCM_CGCR0),  5);
 155         clk[i2c_ipg_per] = imx_clk_gate("i2c_ipg_per", "per6", ccm(CCM_CGCR0),  6);
 156         clk[lcdc_ipg_per] = imx_clk_gate("lcdc_ipg_per", "per7", ccm(CCM_CGCR0),  7);
 157         clk[nfc_ipg_per] = imx_clk_gate("nfc_ipg_per", "per8", ccm(CCM_CGCR0),  8);
 158         clk[owire_ipg_per] = imx_clk_gate("owire_ipg_per", "per9", ccm(CCM_CGCR0),  9);
 159         clk[pwm_ipg_per] = imx_clk_gate("pwm_ipg_per", "per10", ccm(CCM_CGCR0),  10);
 160         clk[sim1_ipg_per] = imx_clk_gate("sim1_ipg_per", "per11", ccm(CCM_CGCR0),  11);
 161         clk[sim2_ipg_per] = imx_clk_gate("sim2_ipg_per", "per12", ccm(CCM_CGCR0),  12);
 162         clk[ssi1_ipg_per] = imx_clk_gate("ssi1_ipg_per", "per13", ccm(CCM_CGCR0), 13);
 163         clk[ssi2_ipg_per] = imx_clk_gate("ssi2_ipg_per", "per14", ccm(CCM_CGCR0), 14);
 164         clk[uart_ipg_per] = imx_clk_gate("uart_ipg_per", "per15", ccm(CCM_CGCR0), 15);
 165         clk[ata_ahb] = imx_clk_gate("ata_ahb", "ahb", ccm(CCM_CGCR0), 16);
 166         /* CCM_CGCR0(17): reserved */
 167         clk[csi_ahb] = imx_clk_gate("csi_ahb", "ahb", ccm(CCM_CGCR0), 18);
 168         clk[emi_ahb] = imx_clk_gate("emi_ahb", "ahb", ccm(CCM_CGCR0), 19);
 169         clk[esai_ahb] = imx_clk_gate("esai_ahb", "ahb", ccm(CCM_CGCR0), 20);
 170         clk[esdhc1_ahb] = imx_clk_gate("esdhc1_ahb", "ahb", ccm(CCM_CGCR0), 21);
 171         clk[esdhc2_ahb] = imx_clk_gate("esdhc2_ahb", "ahb", ccm(CCM_CGCR0), 22);
 172         clk[fec_ahb] = imx_clk_gate("fec_ahb", "ahb", ccm(CCM_CGCR0), 23);
 173         clk[lcdc_ahb] = imx_clk_gate("lcdc_ahb", "ahb", ccm(CCM_CGCR0), 24);
 174         clk[rtic_ahb] = imx_clk_gate("rtic_ahb", "ahb", ccm(CCM_CGCR0), 25);
 175         clk[sdma_ahb] = imx_clk_gate("sdma_ahb", "ahb", ccm(CCM_CGCR0), 26);
 176         clk[slcdc_ahb] = imx_clk_gate("slcdc_ahb", "ahb", ccm(CCM_CGCR0), 27);
 177         clk[usbotg_ahb] = imx_clk_gate("usbotg_ahb", "ahb", ccm(CCM_CGCR0), 28);
 178         /* CCM_CGCR0(29-31): reserved */
 179         /* CCM_CGCR1(0): reserved in datasheet, used as audmux in FSL kernel */
 180         clk[can1_ipg] = imx_clk_gate("can1_ipg", "ipg", ccm(CCM_CGCR1),  2);
 181         clk[can2_ipg] = imx_clk_gate("can2_ipg", "ipg", ccm(CCM_CGCR1),  3);
 182         clk[csi_ipg] = imx_clk_gate("csi_ipg", "ipg", ccm(CCM_CGCR1),  4);
 183         clk[cspi1_ipg] = imx_clk_gate("cspi1_ipg", "ipg", ccm(CCM_CGCR1),  5);
 184         clk[cspi2_ipg] = imx_clk_gate("cspi2_ipg", "ipg", ccm(CCM_CGCR1),  6);
 185         clk[cspi3_ipg] = imx_clk_gate("cspi3_ipg", "ipg", ccm(CCM_CGCR1),  7);
 186         clk[dryice_ipg] = imx_clk_gate("dryice_ipg", "ipg", ccm(CCM_CGCR1),  8);
 187         clk[ect_ipg] = imx_clk_gate("ect_ipg", "ipg", ccm(CCM_CGCR1),  9);
 188         clk[epit1_ipg] = imx_clk_gate("epit1_ipg", "ipg", ccm(CCM_CGCR1),  10);
 189         clk[epit2_ipg] = imx_clk_gate("epit2_ipg", "ipg", ccm(CCM_CGCR1),  11);
 190         /* CCM_CGCR1(12): reserved in datasheet, used as esai in FSL kernel */
 191         clk[esdhc1_ipg] = imx_clk_gate("esdhc1_ipg", "ipg", ccm(CCM_CGCR1), 13);
 192         clk[esdhc2_ipg] = imx_clk_gate("esdhc2_ipg", "ipg", ccm(CCM_CGCR1), 14);
 193         clk[fec_ipg] = imx_clk_gate("fec_ipg", "ipg", ccm(CCM_CGCR1), 15);
 194         /* CCM_CGCR1(16): reserved in datasheet, used as gpio1 in FSL kernel */
 195         /* CCM_CGCR1(17): reserved in datasheet, used as gpio2 in FSL kernel */
 196         /* CCM_CGCR1(18): reserved in datasheet, used as gpio3 in FSL kernel */
 197         clk[gpt1_ipg] = imx_clk_gate("gpt1_ipg", "ipg", ccm(CCM_CGCR1), 19);
 198         clk[gpt2_ipg] = imx_clk_gate("gpt2_ipg", "ipg", ccm(CCM_CGCR1), 20);
 199         clk[gpt3_ipg] = imx_clk_gate("gpt3_ipg", "ipg", ccm(CCM_CGCR1), 21);
 200         clk[gpt4_ipg] = imx_clk_gate("gpt4_ipg", "ipg", ccm(CCM_CGCR1), 22);
 201         /* CCM_CGCR1(23): reserved in datasheet, used as i2c1 in FSL kernel */
 202         /* CCM_CGCR1(24): reserved in datasheet, used as i2c2 in FSL kernel */
 203         /* CCM_CGCR1(25): reserved in datasheet, used as i2c3 in FSL kernel */
 204         clk[iim_ipg] = imx_clk_gate("iim_ipg", "ipg", ccm(CCM_CGCR1), 26);
 205         /* CCM_CGCR1(27): reserved in datasheet, used as iomuxc in FSL kernel */
 206         /* CCM_CGCR1(28): reserved in datasheet, used as kpp in FSL kernel */
 207         clk[kpp_ipg] = imx_clk_gate("kpp_ipg", "ipg", ccm(CCM_CGCR1), 28);
 208         clk[lcdc_ipg] = imx_clk_gate("lcdc_ipg", "ipg", ccm(CCM_CGCR1), 29);
 209         /* CCM_CGCR1(30): reserved in datasheet, used as owire in FSL kernel */
 210         clk[pwm1_ipg] = imx_clk_gate("pwm1_ipg", "ipg", ccm(CCM_CGCR1), 31);
 211         clk[pwm2_ipg] = imx_clk_gate("pwm2_ipg", "ipg", ccm(CCM_CGCR2),  0);
 212         clk[pwm3_ipg] = imx_clk_gate("pwm3_ipg", "ipg", ccm(CCM_CGCR2),  1);
 213         clk[pwm4_ipg] = imx_clk_gate("pwm4_ipg", "ipg", ccm(CCM_CGCR2),  2);
 214         clk[rngb_ipg] = imx_clk_gate("rngb_ipg", "ipg", ccm(CCM_CGCR2),  3);
 215         /* CCM_CGCR2(4): reserved in datasheet, used as rtic in FSL kernel */
 216         clk[scc_ipg] = imx_clk_gate("scc_ipg", "ipg", ccm(CCM_CGCR2),  5);
 217         clk[sdma_ipg] = imx_clk_gate("sdma_ipg", "ipg", ccm(CCM_CGCR2),  6);
 218         clk[sim1_ipg] = imx_clk_gate("sim1_ipg", "ipg", ccm(CCM_CGCR2),  7);
 219         clk[sim2_ipg] = imx_clk_gate("sim2_ipg", "ipg", ccm(CCM_CGCR2),  8);
 220         clk[slcdc_ipg] = imx_clk_gate("slcdc_ipg", "ipg", ccm(CCM_CGCR2),  9);
 221         clk[spba_ipg] = imx_clk_gate("spba_ipg", "ipg", ccm(CCM_CGCR2),  10);
 222         clk[ssi1_ipg] = imx_clk_gate("ssi1_ipg", "ipg", ccm(CCM_CGCR2), 11);
 223         clk[ssi2_ipg] = imx_clk_gate("ssi2_ipg", "ipg", ccm(CCM_CGCR2), 12);
 224         clk[tsc_ipg] = imx_clk_gate("tsc_ipg", "ipg", ccm(CCM_CGCR2), 13);
 225         clk[uart1_ipg] = imx_clk_gate("uart1_ipg", "ipg", ccm(CCM_CGCR2), 14);
 226         clk[uart2_ipg] = imx_clk_gate("uart2_ipg", "ipg", ccm(CCM_CGCR2), 15);
 227         clk[uart3_ipg] = imx_clk_gate("uart3_ipg", "ipg", ccm(CCM_CGCR2), 16);
 228         clk[uart4_ipg] = imx_clk_gate("uart4_ipg", "ipg", ccm(CCM_CGCR2), 17);
 229         clk[uart5_ipg] = imx_clk_gate("uart5_ipg", "ipg", ccm(CCM_CGCR2), 18);
 230         /* CCM_CGCR2(19): reserved in datasheet, but used as wdt in FSL kernel */
 231         clk[wdt_ipg] = imx_clk_gate("wdt_ipg", "ipg", ccm(CCM_CGCR2), 19);
 232
 233         imx_check_clocks(clk, ARRAY_SIZE(clk));
 234
 235         clk_prepare_enable(clk[emi_ahb]);
 236
 237         /* Clock source for gpt must be derived from AHB */
 238         clk_set_parent(clk[per5_sel], clk[ahb]);
 239
 240         /*
 241          * Let's initially set up CLKO parent as ipg, since this configuration
 242          * is used on some imx25 board designs to clock the audio codec.
 243          */
 244         clk_set_parent(clk[cko_sel], clk[ipg]);
 245
 246         imx_register_uart_clocks(uart_clks);
 247
 248         return 0;
 249 }
 250
 251 static void __init mx25_clocks_init_dt(struct device_node *np)
 252 {
 253         struct device_node *refnp;
 254         unsigned long osc_rate = 24000000;
 255         void __iomem *ccm;
 256
 257         /* retrieve the freqency of fixed clocks from device tree */
 258         for_each_compatible_node(refnp, NULL, "fixed-clock") {
 259                 u32 rate;
 260                 if (of_property_read_u32(refnp, "clock-frequency", &rate))
 261                         continue;
 262
 263                 if (of_device_is_compatible(refnp, "fsl,imx-osc"))
 264                         osc_rate = rate;
 265         }
 266
 267         ccm = of_iomap(np, 0);
 268         __mx25_clocks_init(osc_rate, ccm);
 269
 270         clk_data.clks = clk;
 271         clk_data.clk_num = ARRAY_SIZE(clk);
 272         of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
 273 }
 274 CLK_OF_DECLARE(imx25_ccm, "fsl,imx25-ccm", mx25_clocks_init_dt);