arch/arm/mach-shmobile/clock-r8a7790.c

   1 /*
   2  * r8a7790 clock framework support
   3  *
   4  * Copyright (C) 2013  Renesas Solutions Corp.
   5  * Copyright (C) 2013  Magnus Damm
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22 #include <linux/kernel.h>
  23 #include <linux/sh_clk.h>
  24 #include <linux/clkdev.h>
  25 #include <mach/clock.h>
  26 #include <mach/common.h>
  27
  28 /*
  29  *   MD         EXTAL           PLL0    PLL1    PLL3
  30  * 14 13 19     (MHz)           *1      *1
  31  *---------------------------------------------------
  32  * 0  0  0      15 x 1          x172/2  x208/2  x106
  33  * 0  0  1      15 x 1          x172/2  x208/2  x88
  34  * 0  1  0      20 x 1          x130/2  x156/2  x80
  35  * 0  1  1      20 x 1          x130/2  x156/2  x66
  36  * 1  0  0      26 / 2          x200/2  x240/2  x122
  37  * 1  0  1      26 / 2          x200/2  x240/2  x102
  38  * 1  1  0      30 / 2          x172/2  x208/2  x106
  39  * 1  1  1      30 / 2          x172/2  x208/2  x88
  40  *
  41  * *1 : Table 7.6 indicates VCO ouput (PLLx = VCO/2)
  42  *      see "p1 / 2" on R8A7790_CLOCK_ROOT() below
  43  */
  44
  45 #define MD(nr)  (1 << nr)
  46
  47 #define CPG_BASE 0xe6150000
  48 #define CPG_LEN 0x1000
  49
  50 #define SMSTPCR2 0xe6150138
  51 #define SMSTPCR3 0xe615013c
  52 #define SMSTPCR7 0xe615014c
  53
  54 #define MODEMR          0xE6160060
  55 #define SDCKCR          0xE6150074
  56 #define SD2CKCR         0xE6150078
  57 #define SD3CKCR         0xE615007C
  58 #define MMC0CKCR        0xE6150240
  59 #define MMC1CKCR        0xE6150244
  60 #define SSPCKCR         0xE6150248
  61 #define SSPRSCKCR       0xE615024C
  62
  63 static struct clk_mapping cpg_mapping = {
  64         .phys   = CPG_BASE,
  65         .len    = CPG_LEN,
  66 };
  67
  68 static struct clk extal_clk = {
  69         /* .rate will be updated on r8a7790_clock_init() */
  70         .mapping        = &cpg_mapping,
  71 };
  72
  73 static struct sh_clk_ops followparent_clk_ops = {
  74         .recalc = followparent_recalc,
  75 };
  76
  77 static struct clk main_clk = {
  78         /* .parent will be set r8a73a4_clock_init */
  79         .ops    = &followparent_clk_ops,
  80 };
  81
  82 /*
  83  * clock ratio of these clock will be updated
  84  * on r8a7790_clock_init()
  85  */
  86 SH_FIXED_RATIO_CLK_SET(pll1_clk,                main_clk,       1, 1);
  87 SH_FIXED_RATIO_CLK_SET(pll3_clk,                main_clk,       1, 1);
  88 SH_FIXED_RATIO_CLK_SET(lb_clk,                  pll1_clk,       1, 1);
  89 SH_FIXED_RATIO_CLK_SET(qspi_clk,                pll1_clk,       1, 1);
  90
  91 /* fixed ratio clock */
  92 SH_FIXED_RATIO_CLK_SET(extal_div2_clk,          extal_clk,      1, 2);
  93 SH_FIXED_RATIO_CLK_SET(cp_clk,                  extal_clk,      1, 2);
  94
  95 SH_FIXED_RATIO_CLK_SET(pll1_div2_clk,           pll1_clk,       1, 2);
  96 SH_FIXED_RATIO_CLK_SET(zg_clk,                  pll1_clk,       1, 3);
  97 SH_FIXED_RATIO_CLK_SET(zx_clk,                  pll1_clk,       1, 3);
  98 SH_FIXED_RATIO_CLK_SET(zs_clk,                  pll1_clk,       1, 6);
  99 SH_FIXED_RATIO_CLK_SET(hp_clk,                  pll1_clk,       1, 12);
 100 SH_FIXED_RATIO_CLK_SET(i_clk,                   pll1_clk,       1, 2);
 101 SH_FIXED_RATIO_CLK_SET(b_clk,                   pll1_clk,       1, 12);
 102 SH_FIXED_RATIO_CLK_SET(p_clk,                   pll1_clk,       1, 24);
 103 SH_FIXED_RATIO_CLK_SET(cl_clk,                  pll1_clk,       1, 48);
 104 SH_FIXED_RATIO_CLK_SET(m2_clk,                  pll1_clk,       1, 8);
 105 SH_FIXED_RATIO_CLK_SET(imp_clk,                 pll1_clk,       1, 4);
 106 SH_FIXED_RATIO_CLK_SET(rclk_clk,                pll1_clk,       1, (48 * 1024));
 107 SH_FIXED_RATIO_CLK_SET(oscclk_clk,              pll1_clk,       1, (12 * 1024));
 108
 109 SH_FIXED_RATIO_CLK_SET(zb3_clk,                 pll3_clk,       1, 4);
 110 SH_FIXED_RATIO_CLK_SET(zb3d2_clk,               pll3_clk,       1, 8);
 111 SH_FIXED_RATIO_CLK_SET(ddr_clk,                 pll3_clk,       1, 8);
 112 SH_FIXED_RATIO_CLK_SET(mp_clk,                  pll1_div2_clk,  1, 15);
 113
 114 static struct clk *main_clks[] = {
 115         &extal_clk,
 116         &extal_div2_clk,
 117         &main_clk,
 118         &pll1_clk,
 119         &pll1_div2_clk,
 120         &pll3_clk,
 121         &lb_clk,
 122         &qspi_clk,
 123         &zg_clk,
 124         &zx_clk,
 125         &zs_clk,
 126         &hp_clk,
 127         &i_clk,
 128         &b_clk,
 129         &p_clk,
 130         &cl_clk,
 131         &m2_clk,
 132         &imp_clk,
 133         &rclk_clk,
 134         &oscclk_clk,
 135         &zb3_clk,
 136         &zb3d2_clk,
 137         &ddr_clk,
 138         &mp_clk,
 139         &cp_clk,
 140 };
 141
 142 /* SDHI (DIV4) clock */
 143 static int divisors[] = { 2, 3, 4, 6, 8, 12, 16, 18, 24, 0, 36, 48, 10 };
 144
 145 static struct clk_div_mult_table div4_div_mult_table = {
 146         .divisors = divisors,
 147         .nr_divisors = ARRAY_SIZE(divisors),
 148 };
 149
 150 static struct clk_div4_table div4_table = {
 151         .div_mult_table = &div4_div_mult_table,
 152 };
 153
 154 enum {
 155         DIV4_SDH, DIV4_SD0, DIV4_SD1, DIV4_NR
 156 };
 157
 158 static struct clk div4_clks[DIV4_NR] = {
 159         [DIV4_SDH] = SH_CLK_DIV4(&pll1_clk, SDCKCR, 8, 0x0dff, CLK_ENABLE_ON_INIT),
 160         [DIV4_SD0] = SH_CLK_DIV4(&pll1_clk, SDCKCR, 4, 0x1de0, CLK_ENABLE_ON_INIT),
 161         [DIV4_SD1] = SH_CLK_DIV4(&pll1_clk, SDCKCR, 0, 0x1de0, CLK_ENABLE_ON_INIT),
 162 };
 163
 164 /* DIV6 clocks */
 165 enum {
 166         DIV6_SD2, DIV6_SD3,
 167         DIV6_MMC0, DIV6_MMC1,
 168         DIV6_SSP, DIV6_SSPRS,
 169         DIV6_NR
 170 };
 171
 172 static struct clk div6_clks[DIV6_NR] = {
 173         [DIV6_SD2]      = SH_CLK_DIV6(&pll1_div2_clk, SD2CKCR, 0),
 174         [DIV6_SD3]      = SH_CLK_DIV6(&pll1_div2_clk, SD3CKCR, 0),
 175         [DIV6_MMC0]     = SH_CLK_DIV6(&pll1_div2_clk, MMC0CKCR, 0),
 176         [DIV6_MMC1]     = SH_CLK_DIV6(&pll1_div2_clk, MMC1CKCR, 0),
 177         [DIV6_SSP]      = SH_CLK_DIV6(&pll1_div2_clk, SSPCKCR, 0),
 178         [DIV6_SSPRS]    = SH_CLK_DIV6(&pll1_div2_clk, SSPRSCKCR, 0),
 179 };
 180
 181 /* MSTP */
 182 enum {
 183         MSTP721, MSTP720,
 184         MSTP304,
 185         MSTP216, MSTP207, MSTP206, MSTP204, MSTP203, MSTP202,
 186         MSTP_NR
 187 };
 188
 189 static struct clk mstp_clks[MSTP_NR] = {
 190         [MSTP721] = SH_CLK_MSTP32(&p_clk, SMSTPCR7, 21, 0), /* SCIF0 */
 191         [MSTP720] = SH_CLK_MSTP32(&p_clk, SMSTPCR7, 20, 0), /* SCIF1 */
 192         [MSTP304] = SH_CLK_MSTP32(&cp_clk, SMSTPCR3, 4, 0), /* TPU0 */
 193         [MSTP216] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 16, 0), /* SCIFB2 */
 194         [MSTP207] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 7, 0), /* SCIFB1 */
 195         [MSTP206] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 6, 0), /* SCIFB0 */
 196         [MSTP204] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 4, 0), /* SCIFA0 */
 197         [MSTP203] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 3, 0), /* SCIFA1 */
 198         [MSTP202] = SH_CLK_MSTP32(&mp_clk, SMSTPCR2, 2, 0), /* SCIFA2 */
 199 };
 200
 201 static struct clk_lookup lookups[] = {
 202
 203         /* main clocks */
 204         CLKDEV_CON_ID("extal",          &extal_clk),
 205         CLKDEV_CON_ID("extal_div2",     &extal_div2_clk),
 206         CLKDEV_CON_ID("main",           &main_clk),
 207         CLKDEV_CON_ID("pll1",           &pll1_clk),
 208         CLKDEV_CON_ID("pll1_div2",      &pll1_div2_clk),
 209         CLKDEV_CON_ID("pll3",           &pll3_clk),
 210         CLKDEV_CON_ID("zg",             &zg_clk),
 211         CLKDEV_CON_ID("zx",             &zx_clk),
 212         CLKDEV_CON_ID("zs",             &zs_clk),
 213         CLKDEV_CON_ID("hp",             &hp_clk),
 214         CLKDEV_CON_ID("i",              &i_clk),
 215         CLKDEV_CON_ID("b",              &b_clk),
 216         CLKDEV_CON_ID("lb",             &lb_clk),
 217         CLKDEV_CON_ID("p",              &p_clk),
 218         CLKDEV_CON_ID("cl",             &cl_clk),
 219         CLKDEV_CON_ID("m2",             &m2_clk),
 220         CLKDEV_CON_ID("imp",            &imp_clk),
 221         CLKDEV_CON_ID("rclk",           &rclk_clk),
 222         CLKDEV_CON_ID("oscclk",         &oscclk_clk),
 223         CLKDEV_CON_ID("zb3",            &zb3_clk),
 224         CLKDEV_CON_ID("zb3d2",          &zb3d2_clk),
 225         CLKDEV_CON_ID("ddr",            &ddr_clk),
 226         CLKDEV_CON_ID("mp",             &mp_clk),
 227         CLKDEV_CON_ID("qspi",           &qspi_clk),
 228         CLKDEV_CON_ID("cp",             &cp_clk),
 229
 230         /* DIV4 */
 231         CLKDEV_CON_ID("sdh",            &div4_clks[DIV4_SDH]),
 232         CLKDEV_CON_ID("sd0",            &div4_clks[DIV4_SD0]),
 233         CLKDEV_CON_ID("sd1",            &div4_clks[DIV4_SD1]),
 234
 235         /* DIV6 */
 236         CLKDEV_CON_ID("sd2",            &div6_clks[DIV6_SD2]),
 237         CLKDEV_CON_ID("sd3",            &div6_clks[DIV6_SD3]),
 238         CLKDEV_CON_ID("mmc0",           &div6_clks[DIV6_MMC0]),
 239         CLKDEV_CON_ID("mmc1",           &div6_clks[DIV6_MMC1]),
 240         CLKDEV_CON_ID("ssp",            &div6_clks[DIV6_SSP]),
 241         CLKDEV_CON_ID("ssprs",          &div6_clks[DIV6_SSPRS]),
 242
 243         /* MSTP */
 244         CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[MSTP204]),
 245         CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[MSTP203]),
 246         CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[MSTP206]),
 247         CLKDEV_DEV_ID("sh-sci.3", &mstp_clks[MSTP207]),
 248         CLKDEV_DEV_ID("sh-sci.4", &mstp_clks[MSTP216]),
 249         CLKDEV_DEV_ID("sh-sci.5", &mstp_clks[MSTP202]),
 250         CLKDEV_DEV_ID("sh-sci.6", &mstp_clks[MSTP721]),
 251         CLKDEV_DEV_ID("sh-sci.7", &mstp_clks[MSTP720]),
 252 };
 253
 254 #define R8A7790_CLOCK_ROOT(e, m, p0, p1, p30, p31)              \
 255         extal_clk.rate  = e * 1000 * 1000;                      \
 256         main_clk.parent = m;                                    \
 257         SH_CLK_SET_RATIO(&pll1_clk_ratio, p1 / 2, 1);           \
 258         if (mode & MD(19))                                      \
 259                 SH_CLK_SET_RATIO(&pll3_clk_ratio, p31, 1);      \
 260         else                                                    \
 261                 SH_CLK_SET_RATIO(&pll3_clk_ratio, p30, 1)
 262
 263
 264 void __init r8a7790_clock_init(void)
 265 {
 266         void __iomem *modemr = ioremap_nocache(MODEMR, PAGE_SIZE);
 267         u32 mode;
 268         int k, ret = 0;
 269
 270         BUG_ON(!modemr);
 271         mode = ioread32(modemr);
 272         iounmap(modemr);
 273
 274         switch (mode & (MD(14) | MD(13))) {
 275         case 0:
 276                 R8A7790_CLOCK_ROOT(15, &extal_clk, 172, 208, 106, 88);
 277                 break;
 278         case MD(13):
 279                 R8A7790_CLOCK_ROOT(20, &extal_clk, 130, 156, 80, 66);
 280                 break;
 281         case MD(14):
 282                 R8A7790_CLOCK_ROOT(26, &extal_div2_clk, 200, 240, 122, 102);
 283                 break;
 284         case MD(13) | MD(14):
 285                 R8A7790_CLOCK_ROOT(30, &extal_div2_clk, 172, 208, 106, 88);
 286                 break;
 287         }
 288
 289         if (mode & (MD(18)))
 290                 SH_CLK_SET_RATIO(&lb_clk_ratio, 1, 36);
 291         else
 292                 SH_CLK_SET_RATIO(&lb_clk_ratio, 1, 24);
 293
 294         if ((mode & (MD(3) | MD(2) | MD(1))) == MD(2))
 295                 SH_CLK_SET_RATIO(&qspi_clk_ratio, 1, 16);
 296         else
 297                 SH_CLK_SET_RATIO(&qspi_clk_ratio, 1, 20);
 298
 299         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 300                 ret = clk_register(main_clks[k]);
 301
 302         if (!ret)
 303                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 304
 305         if (!ret)
 306                 ret = sh_clk_div6_register(div6_clks, DIV6_NR);
 307
 308         if (!ret)
 309                 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
 310
 311         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 312
 313         if (!ret)
 314                 shmobile_clk_init();
 315         else
 316                 panic("failed to setup r8a7790 clocks\n");
 317 }