drivers/clk/spear/spear6xx_clock.c

   1 /*
   2  * SPEAr6xx machines clock framework source file
   3  *
   4  * Copyright (C) 2012 ST Microelectronics
   5  * Viresh Kumar <viresh.kumar@st.com>
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2. This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/clkdev.h>
  14 #include <linux/io.h>
  15 #include <linux/spinlock_types.h>
  16 #include <mach/misc_regs.h>
  17 #include "clk.h"
  18
  19 static DEFINE_SPINLOCK(_lock);
  20
  21 #define PLL1_CTR                        (MISC_BASE + 0x008)
  22 #define PLL1_FRQ                        (MISC_BASE + 0x00C)
  23 #define PLL2_CTR                        (MISC_BASE + 0x014)
  24 #define PLL2_FRQ                        (MISC_BASE + 0x018)
  25 #define PLL_CLK_CFG                     (MISC_BASE + 0x020)
  26         /* PLL_CLK_CFG register masks */
  27         #define MCTR_CLK_SHIFT          28
  28         #define MCTR_CLK_MASK           3
  29
  30 #define CORE_CLK_CFG                    (MISC_BASE + 0x024)
  31         /* CORE CLK CFG register masks */
  32         #define HCLK_RATIO_SHIFT        10
  33         #define HCLK_RATIO_MASK         2
  34         #define PCLK_RATIO_SHIFT        8
  35         #define PCLK_RATIO_MASK         2
  36
  37 #define PERIP_CLK_CFG                   (MISC_BASE + 0x028)
  38         /* PERIP_CLK_CFG register masks */
  39         #define CLCD_CLK_SHIFT          2
  40         #define CLCD_CLK_MASK           2
  41         #define UART_CLK_SHIFT          4
  42         #define UART_CLK_MASK           1
  43         #define FIRDA_CLK_SHIFT         5
  44         #define FIRDA_CLK_MASK          2
  45         #define GPT0_CLK_SHIFT          8
  46         #define GPT1_CLK_SHIFT          10
  47         #define GPT2_CLK_SHIFT          11
  48         #define GPT3_CLK_SHIFT          12
  49         #define GPT_CLK_MASK            1
  50
  51 #define PERIP1_CLK_ENB                  (MISC_BASE + 0x02C)
  52         /* PERIP1_CLK_ENB register masks */
  53         #define UART0_CLK_ENB           3
  54         #define UART1_CLK_ENB           4
  55         #define SSP0_CLK_ENB            5
  56         #define SSP1_CLK_ENB            6
  57         #define I2C_CLK_ENB             7
  58         #define JPEG_CLK_ENB            8
  59         #define FSMC_CLK_ENB            9
  60         #define FIRDA_CLK_ENB           10
  61         #define GPT2_CLK_ENB            11
  62         #define GPT3_CLK_ENB            12
  63         #define GPIO2_CLK_ENB           13
  64         #define SSP2_CLK_ENB            14
  65         #define ADC_CLK_ENB             15
  66         #define GPT1_CLK_ENB            11
  67         #define RTC_CLK_ENB             17
  68         #define GPIO1_CLK_ENB           18
  69         #define DMA_CLK_ENB             19
  70         #define SMI_CLK_ENB             21
  71         #define CLCD_CLK_ENB            22
  72         #define GMAC_CLK_ENB            23
  73         #define USBD_CLK_ENB            24
  74         #define USBH0_CLK_ENB           25
  75         #define USBH1_CLK_ENB           26
  76
  77 #define PRSC0_CLK_CFG                   (MISC_BASE + 0x044)
  78 #define PRSC1_CLK_CFG                   (MISC_BASE + 0x048)
  79 #define PRSC2_CLK_CFG                   (MISC_BASE + 0x04C)
  80
  81 #define CLCD_CLK_SYNT                   (MISC_BASE + 0x05C)
  82 #define FIRDA_CLK_SYNT                  (MISC_BASE + 0x060)
  83 #define UART_CLK_SYNT                   (MISC_BASE + 0x064)
  84
  85 /* vco rate configuration table, in ascending order of rates */
  86 static struct pll_rate_tbl pll_rtbl[] = {
  87         {.mode = 0, .m = 0x53, .n = 0x0F, .p = 0x1}, /* vco 332 & pll 166 MHz */
  88         {.mode = 0, .m = 0x85, .n = 0x0F, .p = 0x1}, /* vco 532 & pll 266 MHz */
  89         {.mode = 0, .m = 0xA6, .n = 0x0F, .p = 0x1}, /* vco 664 & pll 332 MHz */
  90 };
  91
  92 /* aux rate configuration table, in ascending order of rates */
  93 static struct aux_rate_tbl aux_rtbl[] = {
  94         /* For PLL1 = 332 MHz */
  95         {.xscale = 2, .yscale = 8, .eq = 0}, /* 41.5 MHz */
  96         {.xscale = 2, .yscale = 4, .eq = 0}, /* 83 MHz */
  97         {.xscale = 1, .yscale = 2, .eq = 1}, /* 166 MHz */
  98 };
  99
 100 static const char *clcd_parents[] = { "pll3_48m_clk", "clcd_synth_gate_clk", };
 101 static const char *firda_parents[] = { "pll3_48m_clk", "firda_synth_gate_clk",
 102 };
 103 static const char *uart_parents[] = { "pll3_48m_clk", "uart_synth_gate_clk", };
 104 static const char *gpt0_1_parents[] = { "pll3_48m_clk", "gpt0_1_synth_clk", };
 105 static const char *gpt2_parents[] = { "pll3_48m_clk", "gpt2_synth_clk", };
 106 static const char *gpt3_parents[] = { "pll3_48m_clk", "gpt3_synth_clk", };
 107 static const char *ddr_parents[] = { "ahb_clk", "ahbmult2_clk", "none",
 108         "pll2_clk", };
 109
 110 /* gpt rate configuration table, in ascending order of rates */
 111 static struct gpt_rate_tbl gpt_rtbl[] = {
 112         /* For pll1 = 332 MHz */
 113         {.mscale = 4, .nscale = 0}, /* 41.5 MHz */
 114         {.mscale = 2, .nscale = 0}, /* 55.3 MHz */
 115         {.mscale = 1, .nscale = 0}, /* 83 MHz */
 116 };
 117
 118 void __init spear6xx_clk_init(void)
 119 {
 120         struct clk *clk, *clk1;
 121
 122         clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
 123         clk_register_clkdev(clk, "apb_pclk", NULL);
 124
 125         clk = clk_register_fixed_rate(NULL, "osc_32k_clk", NULL, CLK_IS_ROOT,
 126                         32000);
 127         clk_register_clkdev(clk, "osc_32k_clk", NULL);
 128
 129         clk = clk_register_fixed_rate(NULL, "osc_30m_clk", NULL, CLK_IS_ROOT,
 130                         30000000);
 131         clk_register_clkdev(clk, "osc_30m_clk", NULL);
 132
 133         /* clock derived from 32 KHz osc clk */
 134         clk = clk_register_gate(NULL, "rtc_spear", "osc_32k_clk", 0,
 135                         PERIP1_CLK_ENB, RTC_CLK_ENB, 0, &_lock);
 136         clk_register_clkdev(clk, NULL, "rtc-spear");
 137
 138         /* clock derived from 30 MHz osc clk */
 139         clk = clk_register_fixed_rate(NULL, "pll3_48m_clk", "osc_24m_clk", 0,
 140                         48000000);
 141         clk_register_clkdev(clk, "pll3_48m_clk", NULL);
 142
 143         clk = clk_register_vco_pll("vco1_clk", "pll1_clk", NULL, "osc_30m_clk",
 144                         0, PLL1_CTR, PLL1_FRQ, pll_rtbl, ARRAY_SIZE(pll_rtbl),
 145                         &_lock, &clk1, NULL);
 146         clk_register_clkdev(clk, "vco1_clk", NULL);
 147         clk_register_clkdev(clk1, "pll1_clk", NULL);
 148
 149         clk = clk_register_vco_pll("vco2_clk", "pll2_clk", NULL,
 150                         "osc_30m_clk", 0, PLL2_CTR, PLL2_FRQ, pll_rtbl,
 151                         ARRAY_SIZE(pll_rtbl), &_lock, &clk1, NULL);
 152         clk_register_clkdev(clk, "vco2_clk", NULL);
 153         clk_register_clkdev(clk1, "pll2_clk", NULL);
 154
 155         clk = clk_register_fixed_factor(NULL, "wdt_clk", "osc_30m_clk", 0, 1,
 156                         1);
 157         clk_register_clkdev(clk, NULL, "wdt");
 158
 159         /* clock derived from pll1 clk */
 160         clk = clk_register_fixed_factor(NULL, "cpu_clk", "pll1_clk", 0, 1, 1);
 161         clk_register_clkdev(clk, "cpu_clk", NULL);
 162
 163         clk = clk_register_divider(NULL, "ahb_clk", "pll1_clk",
 164                         CLK_SET_RATE_PARENT, CORE_CLK_CFG, HCLK_RATIO_SHIFT,
 165                         HCLK_RATIO_MASK, 0, &_lock);
 166         clk_register_clkdev(clk, "ahb_clk", NULL);
 167
 168         clk = clk_register_aux("uart_synth_clk", "uart_synth_gate_clk",
 169                         "pll1_clk", 0, UART_CLK_SYNT, NULL, aux_rtbl,
 170                         ARRAY_SIZE(aux_rtbl), &_lock, &clk1);
 171         clk_register_clkdev(clk, "uart_synth_clk", NULL);
 172         clk_register_clkdev(clk1, "uart_synth_gate_clk", NULL);
 173
 174         clk = clk_register_mux(NULL, "uart_mux_clk", uart_parents,
 175                         ARRAY_SIZE(uart_parents), 0, PERIP_CLK_CFG,
 176                         UART_CLK_SHIFT, UART_CLK_MASK, 0, &_lock);
 177         clk_register_clkdev(clk, "uart_mux_clk", NULL);
 178
 179         clk = clk_register_gate(NULL, "uart0", "uart_mux_clk", 0,
 180                         PERIP1_CLK_ENB, UART0_CLK_ENB, 0, &_lock);
 181         clk_register_clkdev(clk, NULL, "d0000000.serial");
 182
 183         clk = clk_register_gate(NULL, "uart1", "uart_mux_clk", 0,
 184                         PERIP1_CLK_ENB, UART1_CLK_ENB, 0, &_lock);
 185         clk_register_clkdev(clk, NULL, "d0080000.serial");
 186
 187         clk = clk_register_aux("firda_synth_clk", "firda_synth_gate_clk",
 188                         "pll1_clk", 0, FIRDA_CLK_SYNT, NULL, aux_rtbl,
 189                         ARRAY_SIZE(aux_rtbl), &_lock, &clk1);
 190         clk_register_clkdev(clk, "firda_synth_clk", NULL);
 191         clk_register_clkdev(clk1, "firda_synth_gate_clk", NULL);
 192
 193         clk = clk_register_mux(NULL, "firda_mux_clk", firda_parents,
 194                         ARRAY_SIZE(firda_parents), 0, PERIP_CLK_CFG,
 195                         FIRDA_CLK_SHIFT, FIRDA_CLK_MASK, 0, &_lock);
 196         clk_register_clkdev(clk, "firda_mux_clk", NULL);
 197
 198         clk = clk_register_gate(NULL, "firda_clk", "firda_mux_clk", 0,
 199                         PERIP1_CLK_ENB, FIRDA_CLK_ENB, 0, &_lock);
 200         clk_register_clkdev(clk, NULL, "firda");
 201
 202         clk = clk_register_aux("clcd_synth_clk", "clcd_synth_gate_clk",
 203                         "pll1_clk", 0, CLCD_CLK_SYNT, NULL, aux_rtbl,
 204                         ARRAY_SIZE(aux_rtbl), &_lock, &clk1);
 205         clk_register_clkdev(clk, "clcd_synth_clk", NULL);
 206         clk_register_clkdev(clk1, "clcd_synth_gate_clk", NULL);
 207
 208         clk = clk_register_mux(NULL, "clcd_mux_clk", clcd_parents,
 209                         ARRAY_SIZE(clcd_parents), 0, PERIP_CLK_CFG,
 210                         CLCD_CLK_SHIFT, CLCD_CLK_MASK, 0, &_lock);
 211         clk_register_clkdev(clk, "clcd_mux_clk", NULL);
 212
 213         clk = clk_register_gate(NULL, "clcd_clk", "clcd_mux_clk", 0,
 214                         PERIP1_CLK_ENB, CLCD_CLK_ENB, 0, &_lock);
 215         clk_register_clkdev(clk, NULL, "clcd");
 216
 217         /* gpt clocks */
 218         clk = clk_register_gpt("gpt0_1_synth_clk", "pll1_clk", 0, PRSC0_CLK_CFG,
 219                         gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
 220         clk_register_clkdev(clk, "gpt0_1_synth_clk", NULL);
 221
 222         clk = clk_register_mux(NULL, "gpt0_mux_clk", gpt0_1_parents,
 223                         ARRAY_SIZE(gpt0_1_parents), 0, PERIP_CLK_CFG,
 224                         GPT0_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 225         clk_register_clkdev(clk, NULL, "gpt0");
 226
 227         clk = clk_register_mux(NULL, "gpt1_mux_clk", gpt0_1_parents,
 228                         ARRAY_SIZE(gpt0_1_parents), 0, PERIP_CLK_CFG,
 229                         GPT1_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 230         clk_register_clkdev(clk, "gpt1_mux_clk", NULL);
 231
 232         clk = clk_register_gate(NULL, "gpt1_clk", "gpt1_mux_clk", 0,
 233                         PERIP1_CLK_ENB, GPT1_CLK_ENB, 0, &_lock);
 234         clk_register_clkdev(clk, NULL, "gpt1");
 235
 236         clk = clk_register_gpt("gpt2_synth_clk", "pll1_clk", 0, PRSC1_CLK_CFG,
 237                         gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
 238         clk_register_clkdev(clk, "gpt2_synth_clk", NULL);
 239
 240         clk = clk_register_mux(NULL, "gpt2_mux_clk", gpt2_parents,
 241                         ARRAY_SIZE(gpt2_parents), 0, PERIP_CLK_CFG,
 242                         GPT2_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 243         clk_register_clkdev(clk, "gpt2_mux_clk", NULL);
 244
 245         clk = clk_register_gate(NULL, "gpt2_clk", "gpt2_mux_clk", 0,
 246                         PERIP1_CLK_ENB, GPT2_CLK_ENB, 0, &_lock);
 247         clk_register_clkdev(clk, NULL, "gpt2");
 248
 249         clk = clk_register_gpt("gpt3_synth_clk", "pll1_clk", 0, PRSC2_CLK_CFG,
 250                         gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
 251         clk_register_clkdev(clk, "gpt3_synth_clk", NULL);
 252
 253         clk = clk_register_mux(NULL, "gpt3_mux_clk", gpt3_parents,
 254                         ARRAY_SIZE(gpt3_parents), 0, PERIP_CLK_CFG,
 255                         GPT3_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 256         clk_register_clkdev(clk, "gpt3_mux_clk", NULL);
 257
 258         clk = clk_register_gate(NULL, "gpt3_clk", "gpt3_mux_clk", 0,
 259                         PERIP1_CLK_ENB, GPT3_CLK_ENB, 0, &_lock);
 260         clk_register_clkdev(clk, NULL, "gpt3");
 261
 262         /* clock derived from pll3 clk */
 263         clk = clk_register_gate(NULL, "usbh0_clk", "pll3_48m_clk", 0,
 264                         PERIP1_CLK_ENB, USBH0_CLK_ENB, 0, &_lock);
 265         clk_register_clkdev(clk, NULL, "usbh.0_clk");
 266
 267         clk = clk_register_gate(NULL, "usbh1_clk", "pll3_48m_clk", 0,
 268                         PERIP1_CLK_ENB, USBH1_CLK_ENB, 0, &_lock);
 269         clk_register_clkdev(clk, NULL, "usbh.1_clk");
 270
 271         clk = clk_register_gate(NULL, "usbd_clk", "pll3_48m_clk", 0,
 272                         PERIP1_CLK_ENB, USBD_CLK_ENB, 0, &_lock);
 273         clk_register_clkdev(clk, NULL, "designware_udc");
 274
 275         /* clock derived from ahb clk */
 276         clk = clk_register_fixed_factor(NULL, "ahbmult2_clk", "ahb_clk", 0, 2,
 277                         1);
 278         clk_register_clkdev(clk, "ahbmult2_clk", NULL);
 279
 280         clk = clk_register_mux(NULL, "ddr_clk", ddr_parents,
 281                         ARRAY_SIZE(ddr_parents),
 282                         0, PLL_CLK_CFG, MCTR_CLK_SHIFT, MCTR_CLK_MASK, 0,
 283                         &_lock);
 284         clk_register_clkdev(clk, "ddr_clk", NULL);
 285
 286         clk = clk_register_divider(NULL, "apb_clk", "ahb_clk",
 287                         CLK_SET_RATE_PARENT, CORE_CLK_CFG, PCLK_RATIO_SHIFT,
 288                         PCLK_RATIO_MASK, 0, &_lock);
 289         clk_register_clkdev(clk, "apb_clk", NULL);
 290
 291         clk = clk_register_gate(NULL, "dma_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 292                         DMA_CLK_ENB, 0, &_lock);
 293         clk_register_clkdev(clk, NULL, "fc400000.dma");
 294
 295         clk = clk_register_gate(NULL, "fsmc_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 296                         FSMC_CLK_ENB, 0, &_lock);
 297         clk_register_clkdev(clk, NULL, "d1800000.flash");
 298
 299         clk = clk_register_gate(NULL, "gmac_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 300                         GMAC_CLK_ENB, 0, &_lock);
 301         clk_register_clkdev(clk, NULL, "gmac");
 302
 303         clk = clk_register_gate(NULL, "i2c_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 304                         I2C_CLK_ENB, 0, &_lock);
 305         clk_register_clkdev(clk, NULL, "d0200000.i2c");
 306
 307         clk = clk_register_gate(NULL, "jpeg_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 308                         JPEG_CLK_ENB, 0, &_lock);
 309         clk_register_clkdev(clk, NULL, "jpeg");
 310
 311         clk = clk_register_gate(NULL, "smi_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 312                         SMI_CLK_ENB, 0, &_lock);
 313         clk_register_clkdev(clk, NULL, "fc000000.flash");
 314
 315         /* clock derived from apb clk */
 316         clk = clk_register_gate(NULL, "adc_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 317                         ADC_CLK_ENB, 0, &_lock);
 318         clk_register_clkdev(clk, NULL, "adc");
 319
 320         clk = clk_register_fixed_factor(NULL, "gpio0_clk", "apb_clk", 0, 1, 1);
 321         clk_register_clkdev(clk, NULL, "f0100000.gpio");
 322
 323         clk = clk_register_gate(NULL, "gpio1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 324                         GPIO1_CLK_ENB, 0, &_lock);
 325         clk_register_clkdev(clk, NULL, "fc980000.gpio");
 326
 327         clk = clk_register_gate(NULL, "gpio2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 328                         GPIO2_CLK_ENB, 0, &_lock);
 329         clk_register_clkdev(clk, NULL, "d8100000.gpio");
 330
 331         clk = clk_register_gate(NULL, "ssp0_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 332                         SSP0_CLK_ENB, 0, &_lock);
 333         clk_register_clkdev(clk, NULL, "ssp-pl022.0");
 334
 335         clk = clk_register_gate(NULL, "ssp1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 336                         SSP1_CLK_ENB, 0, &_lock);
 337         clk_register_clkdev(clk, NULL, "ssp-pl022.1");
 338
 339         clk = clk_register_gate(NULL, "ssp2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 340                         SSP2_CLK_ENB, 0, &_lock);
 341         clk_register_clkdev(clk, NULL, "ssp-pl022.2");
 342 }