Thomas Gleixner | fda8d26 | 2019-05-28 09:57:06 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 2 | /* |
| 3 | * AXI clkgen driver |
| 4 | * |
| 5 | * Copyright 2012-2013 Analog Devices Inc. |
| 6 | * Author: Lars-Peter Clausen <lars@metafoo.de> |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 7 | */ |
| 8 | |
| 9 | #include <linux/platform_device.h> |
| 10 | #include <linux/clk-provider.h> |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 11 | #include <linux/slab.h> |
| 12 | #include <linux/io.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/err.h> |
| 16 | |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 17 | #define AXI_CLKGEN_V2_REG_RESET 0x40 |
Lars-Peter Clausen | 62d1e78 | 2015-11-30 17:54:56 +0100 | [diff] [blame] | 18 | #define AXI_CLKGEN_V2_REG_CLKSEL 0x44 |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 19 | #define AXI_CLKGEN_V2_REG_DRP_CNTRL 0x70 |
| 20 | #define AXI_CLKGEN_V2_REG_DRP_STATUS 0x74 |
| 21 | |
| 22 | #define AXI_CLKGEN_V2_RESET_MMCM_ENABLE BIT(1) |
| 23 | #define AXI_CLKGEN_V2_RESET_ENABLE BIT(0) |
| 24 | |
| 25 | #define AXI_CLKGEN_V2_DRP_CNTRL_SEL BIT(29) |
| 26 | #define AXI_CLKGEN_V2_DRP_CNTRL_READ BIT(28) |
| 27 | |
| 28 | #define AXI_CLKGEN_V2_DRP_STATUS_BUSY BIT(16) |
| 29 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 30 | #define MMCM_REG_CLKOUT5_2 0x07 |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 31 | #define MMCM_REG_CLKOUT0_1 0x08 |
| 32 | #define MMCM_REG_CLKOUT0_2 0x09 |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 33 | #define MMCM_REG_CLKOUT6_2 0x13 |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 34 | #define MMCM_REG_CLK_FB1 0x14 |
| 35 | #define MMCM_REG_CLK_FB2 0x15 |
| 36 | #define MMCM_REG_CLK_DIV 0x16 |
| 37 | #define MMCM_REG_LOCK1 0x18 |
| 38 | #define MMCM_REG_LOCK2 0x19 |
| 39 | #define MMCM_REG_LOCK3 0x1a |
Lars-Peter Clausen | a394720 | 2020-10-01 11:59:48 +0300 | [diff] [blame] | 40 | #define MMCM_REG_POWER 0x28 |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 41 | #define MMCM_REG_FILTER1 0x4e |
| 42 | #define MMCM_REG_FILTER2 0x4f |
| 43 | |
Lars-Peter Clausen | 063578d | 2017-09-05 11:32:40 +0200 | [diff] [blame] | 44 | #define MMCM_CLKOUT_NOCOUNT BIT(6) |
| 45 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 46 | #define MMCM_CLK_DIV_DIVIDE BIT(11) |
Lars-Peter Clausen | 063578d | 2017-09-05 11:32:40 +0200 | [diff] [blame] | 47 | #define MMCM_CLK_DIV_NOCOUNT BIT(12) |
| 48 | |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 49 | struct axi_clkgen_limits { |
| 50 | unsigned int fpfd_min; |
| 51 | unsigned int fpfd_max; |
| 52 | unsigned int fvco_min; |
| 53 | unsigned int fvco_max; |
| 54 | }; |
| 55 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 56 | struct axi_clkgen { |
| 57 | void __iomem *base; |
| 58 | struct clk_hw clk_hw; |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 59 | struct axi_clkgen_limits limits; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 60 | }; |
| 61 | |
| 62 | static uint32_t axi_clkgen_lookup_filter(unsigned int m) |
| 63 | { |
| 64 | switch (m) { |
| 65 | case 0: |
| 66 | return 0x01001990; |
| 67 | case 1: |
| 68 | return 0x01001190; |
| 69 | case 2: |
| 70 | return 0x01009890; |
| 71 | case 3: |
| 72 | return 0x01001890; |
| 73 | case 4: |
| 74 | return 0x01008890; |
| 75 | case 5 ... 8: |
| 76 | return 0x01009090; |
| 77 | case 9 ... 11: |
| 78 | return 0x01000890; |
| 79 | case 12: |
| 80 | return 0x08009090; |
| 81 | case 13 ... 22: |
| 82 | return 0x01001090; |
| 83 | case 23 ... 36: |
| 84 | return 0x01008090; |
| 85 | case 37 ... 46: |
| 86 | return 0x08001090; |
| 87 | default: |
| 88 | return 0x08008090; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | static const uint32_t axi_clkgen_lock_table[] = { |
| 93 | 0x060603e8, 0x060603e8, 0x080803e8, 0x0b0b03e8, |
| 94 | 0x0e0e03e8, 0x111103e8, 0x131303e8, 0x161603e8, |
| 95 | 0x191903e8, 0x1c1c03e8, 0x1f1f0384, 0x1f1f0339, |
| 96 | 0x1f1f02ee, 0x1f1f02bc, 0x1f1f028a, 0x1f1f0271, |
| 97 | 0x1f1f023f, 0x1f1f0226, 0x1f1f020d, 0x1f1f01f4, |
| 98 | 0x1f1f01db, 0x1f1f01c2, 0x1f1f01a9, 0x1f1f0190, |
| 99 | 0x1f1f0190, 0x1f1f0177, 0x1f1f015e, 0x1f1f015e, |
| 100 | 0x1f1f0145, 0x1f1f0145, 0x1f1f012c, 0x1f1f012c, |
| 101 | 0x1f1f012c, 0x1f1f0113, 0x1f1f0113, 0x1f1f0113, |
| 102 | }; |
| 103 | |
| 104 | static uint32_t axi_clkgen_lookup_lock(unsigned int m) |
| 105 | { |
| 106 | if (m < ARRAY_SIZE(axi_clkgen_lock_table)) |
| 107 | return axi_clkgen_lock_table[m]; |
| 108 | return 0x1f1f00fa; |
| 109 | } |
| 110 | |
Alexandru Ardelean | da68c30 | 2021-02-01 17:12:43 +0200 | [diff] [blame] | 111 | static const struct axi_clkgen_limits axi_clkgen_zynqmp_default_limits = { |
| 112 | .fpfd_min = 10000, |
| 113 | .fpfd_max = 450000, |
| 114 | .fvco_min = 800000, |
| 115 | .fvco_max = 1600000, |
| 116 | }; |
| 117 | |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 118 | static const struct axi_clkgen_limits axi_clkgen_zynq_default_limits = { |
| 119 | .fpfd_min = 10000, |
| 120 | .fpfd_max = 300000, |
| 121 | .fvco_min = 600000, |
| 122 | .fvco_max = 1200000, |
| 123 | }; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 124 | |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 125 | static void axi_clkgen_calc_params(const struct axi_clkgen_limits *limits, |
| 126 | unsigned long fin, unsigned long fout, |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 127 | unsigned int *best_d, unsigned int *best_m, unsigned int *best_dout) |
| 128 | { |
| 129 | unsigned long d, d_min, d_max, _d_min, _d_max; |
| 130 | unsigned long m, m_min, m_max; |
| 131 | unsigned long f, dout, best_f, fvco; |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 132 | unsigned long fract_shift = 0; |
| 133 | unsigned long fvco_min_fract, fvco_max_fract; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 134 | |
| 135 | fin /= 1000; |
| 136 | fout /= 1000; |
| 137 | |
| 138 | best_f = ULONG_MAX; |
| 139 | *best_d = 0; |
| 140 | *best_m = 0; |
| 141 | *best_dout = 0; |
| 142 | |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 143 | d_min = max_t(unsigned long, DIV_ROUND_UP(fin, limits->fpfd_max), 1); |
| 144 | d_max = min_t(unsigned long, fin / limits->fpfd_min, 80); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 145 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 146 | again: |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 147 | fvco_min_fract = limits->fvco_min << fract_shift; |
| 148 | fvco_max_fract = limits->fvco_max << fract_shift; |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 149 | |
| 150 | m_min = max_t(unsigned long, DIV_ROUND_UP(fvco_min_fract, fin) * d_min, 1); |
| 151 | m_max = min_t(unsigned long, fvco_max_fract * d_max / fin, 64 << fract_shift); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 152 | |
| 153 | for (m = m_min; m <= m_max; m++) { |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 154 | _d_min = max(d_min, DIV_ROUND_UP(fin * m, fvco_max_fract)); |
| 155 | _d_max = min(d_max, fin * m / fvco_min_fract); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 156 | |
| 157 | for (d = _d_min; d <= _d_max; d++) { |
| 158 | fvco = fin * m / d; |
| 159 | |
| 160 | dout = DIV_ROUND_CLOSEST(fvco, fout); |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 161 | dout = clamp_t(unsigned long, dout, 1, 128 << fract_shift); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 162 | f = fvco / dout; |
| 163 | if (abs(f - fout) < abs(best_f - fout)) { |
| 164 | best_f = f; |
| 165 | *best_d = d; |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 166 | *best_m = m << (3 - fract_shift); |
| 167 | *best_dout = dout << (3 - fract_shift); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 168 | if (best_f == fout) |
| 169 | return; |
| 170 | } |
| 171 | } |
| 172 | } |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 173 | |
| 174 | /* Lets see if we find a better setting in fractional mode */ |
| 175 | if (fract_shift == 0) { |
| 176 | fract_shift = 3; |
| 177 | goto again; |
| 178 | } |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 179 | } |
| 180 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 181 | struct axi_clkgen_div_params { |
| 182 | unsigned int low; |
| 183 | unsigned int high; |
| 184 | unsigned int edge; |
| 185 | unsigned int nocount; |
| 186 | unsigned int frac_en; |
| 187 | unsigned int frac; |
| 188 | unsigned int frac_wf_f; |
| 189 | unsigned int frac_wf_r; |
| 190 | unsigned int frac_phase; |
| 191 | }; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 192 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 193 | static void axi_clkgen_calc_clk_params(unsigned int divider, |
| 194 | unsigned int frac_divider, struct axi_clkgen_div_params *params) |
| 195 | { |
| 196 | |
| 197 | memset(params, 0x0, sizeof(*params)); |
| 198 | |
| 199 | if (divider == 1) { |
| 200 | params->nocount = 1; |
| 201 | return; |
| 202 | } |
| 203 | |
| 204 | if (frac_divider == 0) { |
| 205 | params->high = divider / 2; |
| 206 | params->edge = divider % 2; |
| 207 | params->low = divider - params->high; |
| 208 | } else { |
| 209 | params->frac_en = 1; |
| 210 | params->frac = frac_divider; |
| 211 | |
| 212 | params->high = divider / 2; |
| 213 | params->edge = divider % 2; |
| 214 | params->low = params->high; |
| 215 | |
| 216 | if (params->edge == 0) { |
| 217 | params->high--; |
| 218 | params->frac_wf_r = 1; |
| 219 | } |
| 220 | |
| 221 | if (params->edge == 0 || frac_divider == 1) |
| 222 | params->low--; |
| 223 | if (((params->edge == 0) ^ (frac_divider == 1)) || |
| 224 | (divider == 2 && frac_divider == 1)) |
| 225 | params->frac_wf_f = 1; |
| 226 | |
| 227 | params->frac_phase = params->edge * 4 + frac_divider / 2; |
| 228 | } |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | static void axi_clkgen_write(struct axi_clkgen *axi_clkgen, |
| 232 | unsigned int reg, unsigned int val) |
| 233 | { |
| 234 | writel(val, axi_clkgen->base + reg); |
| 235 | } |
| 236 | |
| 237 | static void axi_clkgen_read(struct axi_clkgen *axi_clkgen, |
| 238 | unsigned int reg, unsigned int *val) |
| 239 | { |
| 240 | *val = readl(axi_clkgen->base + reg); |
| 241 | } |
| 242 | |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 243 | static int axi_clkgen_wait_non_busy(struct axi_clkgen *axi_clkgen) |
| 244 | { |
| 245 | unsigned int timeout = 10000; |
| 246 | unsigned int val; |
| 247 | |
| 248 | do { |
| 249 | axi_clkgen_read(axi_clkgen, AXI_CLKGEN_V2_REG_DRP_STATUS, &val); |
| 250 | } while ((val & AXI_CLKGEN_V2_DRP_STATUS_BUSY) && --timeout); |
| 251 | |
| 252 | if (val & AXI_CLKGEN_V2_DRP_STATUS_BUSY) |
| 253 | return -EIO; |
| 254 | |
| 255 | return val & 0xffff; |
| 256 | } |
| 257 | |
Lars-Peter Clausen | d95b599 | 2015-11-30 17:54:55 +0100 | [diff] [blame] | 258 | static int axi_clkgen_mmcm_read(struct axi_clkgen *axi_clkgen, |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 259 | unsigned int reg, unsigned int *val) |
| 260 | { |
| 261 | unsigned int reg_val; |
| 262 | int ret; |
| 263 | |
| 264 | ret = axi_clkgen_wait_non_busy(axi_clkgen); |
| 265 | if (ret < 0) |
| 266 | return ret; |
| 267 | |
| 268 | reg_val = AXI_CLKGEN_V2_DRP_CNTRL_SEL | AXI_CLKGEN_V2_DRP_CNTRL_READ; |
| 269 | reg_val |= (reg << 16); |
| 270 | |
| 271 | axi_clkgen_write(axi_clkgen, AXI_CLKGEN_V2_REG_DRP_CNTRL, reg_val); |
| 272 | |
| 273 | ret = axi_clkgen_wait_non_busy(axi_clkgen); |
| 274 | if (ret < 0) |
| 275 | return ret; |
| 276 | |
| 277 | *val = ret; |
| 278 | |
| 279 | return 0; |
| 280 | } |
| 281 | |
Lars-Peter Clausen | d95b599 | 2015-11-30 17:54:55 +0100 | [diff] [blame] | 282 | static int axi_clkgen_mmcm_write(struct axi_clkgen *axi_clkgen, |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 283 | unsigned int reg, unsigned int val, unsigned int mask) |
| 284 | { |
| 285 | unsigned int reg_val = 0; |
| 286 | int ret; |
| 287 | |
| 288 | ret = axi_clkgen_wait_non_busy(axi_clkgen); |
| 289 | if (ret < 0) |
| 290 | return ret; |
| 291 | |
| 292 | if (mask != 0xffff) { |
Lars-Peter Clausen | d95b599 | 2015-11-30 17:54:55 +0100 | [diff] [blame] | 293 | axi_clkgen_mmcm_read(axi_clkgen, reg, ®_val); |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 294 | reg_val &= ~mask; |
| 295 | } |
| 296 | |
| 297 | reg_val |= AXI_CLKGEN_V2_DRP_CNTRL_SEL | (reg << 16) | (val & mask); |
| 298 | |
| 299 | axi_clkgen_write(axi_clkgen, AXI_CLKGEN_V2_REG_DRP_CNTRL, reg_val); |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
Lars-Peter Clausen | d95b599 | 2015-11-30 17:54:55 +0100 | [diff] [blame] | 304 | static void axi_clkgen_mmcm_enable(struct axi_clkgen *axi_clkgen, |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 305 | bool enable) |
| 306 | { |
| 307 | unsigned int val = AXI_CLKGEN_V2_RESET_ENABLE; |
| 308 | |
| 309 | if (enable) |
| 310 | val |= AXI_CLKGEN_V2_RESET_MMCM_ENABLE; |
| 311 | |
| 312 | axi_clkgen_write(axi_clkgen, AXI_CLKGEN_V2_REG_RESET, val); |
| 313 | } |
| 314 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 315 | static struct axi_clkgen *clk_hw_to_axi_clkgen(struct clk_hw *clk_hw) |
| 316 | { |
| 317 | return container_of(clk_hw, struct axi_clkgen, clk_hw); |
| 318 | } |
| 319 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 320 | static void axi_clkgen_set_div(struct axi_clkgen *axi_clkgen, |
| 321 | unsigned int reg1, unsigned int reg2, unsigned int reg3, |
| 322 | struct axi_clkgen_div_params *params) |
| 323 | { |
| 324 | axi_clkgen_mmcm_write(axi_clkgen, reg1, |
| 325 | (params->high << 6) | params->low, 0xefff); |
| 326 | axi_clkgen_mmcm_write(axi_clkgen, reg2, |
| 327 | (params->frac << 12) | (params->frac_en << 11) | |
| 328 | (params->frac_wf_r << 10) | (params->edge << 7) | |
| 329 | (params->nocount << 6), 0x7fff); |
| 330 | if (reg3 != 0) { |
| 331 | axi_clkgen_mmcm_write(axi_clkgen, reg3, |
| 332 | (params->frac_phase << 11) | (params->frac_wf_f << 10), 0x3c00); |
| 333 | } |
| 334 | } |
| 335 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 336 | static int axi_clkgen_set_rate(struct clk_hw *clk_hw, |
| 337 | unsigned long rate, unsigned long parent_rate) |
| 338 | { |
| 339 | struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw); |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 340 | const struct axi_clkgen_limits *limits = &axi_clkgen->limits; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 341 | unsigned int d, m, dout; |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 342 | struct axi_clkgen_div_params params; |
Lars-Peter Clausen | a394720 | 2020-10-01 11:59:48 +0300 | [diff] [blame] | 343 | uint32_t power = 0; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 344 | uint32_t filter; |
| 345 | uint32_t lock; |
| 346 | |
| 347 | if (parent_rate == 0 || rate == 0) |
| 348 | return -EINVAL; |
| 349 | |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 350 | axi_clkgen_calc_params(limits, parent_rate, rate, &d, &m, &dout); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 351 | |
| 352 | if (d == 0 || dout == 0 || m == 0) |
| 353 | return -EINVAL; |
| 354 | |
Lars-Peter Clausen | a394720 | 2020-10-01 11:59:48 +0300 | [diff] [blame] | 355 | if ((dout & 0x7) != 0 || (m & 0x7) != 0) |
| 356 | power |= 0x9800; |
| 357 | |
| 358 | axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_POWER, power, 0x9800); |
| 359 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 360 | filter = axi_clkgen_lookup_filter(m - 1); |
| 361 | lock = axi_clkgen_lookup_lock(m - 1); |
| 362 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 363 | axi_clkgen_calc_clk_params(dout >> 3, dout & 0x7, ¶ms); |
| 364 | axi_clkgen_set_div(axi_clkgen, MMCM_REG_CLKOUT0_1, MMCM_REG_CLKOUT0_2, |
| 365 | MMCM_REG_CLKOUT5_2, ¶ms); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 366 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 367 | axi_clkgen_calc_clk_params(d, 0, ¶ms); |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 368 | axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_CLK_DIV, |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 369 | (params.edge << 13) | (params.nocount << 12) | |
| 370 | (params.high << 6) | params.low, 0x3fff); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 371 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 372 | axi_clkgen_calc_clk_params(m >> 3, m & 0x7, ¶ms); |
| 373 | axi_clkgen_set_div(axi_clkgen, MMCM_REG_CLK_FB1, MMCM_REG_CLK_FB2, |
| 374 | MMCM_REG_CLKOUT6_2, ¶ms); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 375 | |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 376 | axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_LOCK1, lock & 0x3ff, 0x3ff); |
| 377 | axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_LOCK2, |
| 378 | (((lock >> 16) & 0x1f) << 10) | 0x1, 0x7fff); |
| 379 | axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_LOCK3, |
| 380 | (((lock >> 24) & 0x1f) << 10) | 0x3e9, 0x7fff); |
| 381 | axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_FILTER1, filter >> 16, 0x9900); |
| 382 | axi_clkgen_mmcm_write(axi_clkgen, MMCM_REG_FILTER2, filter, 0x9900); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 383 | |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | static long axi_clkgen_round_rate(struct clk_hw *hw, unsigned long rate, |
| 388 | unsigned long *parent_rate) |
| 389 | { |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 390 | struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(hw); |
| 391 | const struct axi_clkgen_limits *limits = &axi_clkgen->limits; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 392 | unsigned int d, m, dout; |
Lars-Peter Clausen | 448c3c0 | 2017-09-05 11:32:41 +0200 | [diff] [blame] | 393 | unsigned long long tmp; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 394 | |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 395 | axi_clkgen_calc_params(limits, *parent_rate, rate, &d, &m, &dout); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 396 | |
| 397 | if (d == 0 || dout == 0 || m == 0) |
| 398 | return -EINVAL; |
| 399 | |
Lars-Peter Clausen | 448c3c0 | 2017-09-05 11:32:41 +0200 | [diff] [blame] | 400 | tmp = (unsigned long long)*parent_rate * m; |
| 401 | tmp = DIV_ROUND_CLOSEST_ULL(tmp, dout * d); |
| 402 | |
| 403 | return min_t(unsigned long long, tmp, LONG_MAX); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 404 | } |
| 405 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 406 | static unsigned int axi_clkgen_get_div(struct axi_clkgen *axi_clkgen, |
| 407 | unsigned int reg1, unsigned int reg2) |
| 408 | { |
| 409 | unsigned int val1, val2; |
| 410 | unsigned int div; |
| 411 | |
| 412 | axi_clkgen_mmcm_read(axi_clkgen, reg2, &val2); |
| 413 | if (val2 & MMCM_CLKOUT_NOCOUNT) |
| 414 | return 8; |
| 415 | |
| 416 | axi_clkgen_mmcm_read(axi_clkgen, reg1, &val1); |
| 417 | |
| 418 | div = (val1 & 0x3f) + ((val1 >> 6) & 0x3f); |
| 419 | div <<= 3; |
| 420 | |
| 421 | if (val2 & MMCM_CLK_DIV_DIVIDE) { |
| 422 | if ((val2 & BIT(7)) && (val2 & 0x7000) != 0x1000) |
| 423 | div += 8; |
| 424 | else |
| 425 | div += 16; |
| 426 | |
| 427 | div += (val2 >> 12) & 0x7; |
| 428 | } |
| 429 | |
| 430 | return div; |
| 431 | } |
| 432 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 433 | static unsigned long axi_clkgen_recalc_rate(struct clk_hw *clk_hw, |
| 434 | unsigned long parent_rate) |
| 435 | { |
| 436 | struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw); |
| 437 | unsigned int d, m, dout; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 438 | unsigned long long tmp; |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 439 | unsigned int val; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 440 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 441 | dout = axi_clkgen_get_div(axi_clkgen, MMCM_REG_CLKOUT0_1, |
| 442 | MMCM_REG_CLKOUT0_2); |
| 443 | m = axi_clkgen_get_div(axi_clkgen, MMCM_REG_CLK_FB1, |
| 444 | MMCM_REG_CLK_FB2); |
Lars-Peter Clausen | 063578d | 2017-09-05 11:32:40 +0200 | [diff] [blame] | 445 | |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 446 | axi_clkgen_mmcm_read(axi_clkgen, MMCM_REG_CLK_DIV, &val); |
| 447 | if (val & MMCM_CLK_DIV_NOCOUNT) |
Lars-Peter Clausen | 063578d | 2017-09-05 11:32:40 +0200 | [diff] [blame] | 448 | d = 1; |
| 449 | else |
Lars-Peter Clausen | 86378cf | 2020-10-01 11:59:47 +0300 | [diff] [blame] | 450 | d = (val & 0x3f) + ((val >> 6) & 0x3f); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 451 | |
| 452 | if (d == 0 || dout == 0) |
| 453 | return 0; |
| 454 | |
Lars-Peter Clausen | 448c3c0 | 2017-09-05 11:32:41 +0200 | [diff] [blame] | 455 | tmp = (unsigned long long)parent_rate * m; |
| 456 | tmp = DIV_ROUND_CLOSEST_ULL(tmp, dout * d); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 457 | |
Stephen Boyd | 3d6f1c7 | 2016-01-29 17:09:01 -0800 | [diff] [blame] | 458 | return min_t(unsigned long long, tmp, ULONG_MAX); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 459 | } |
| 460 | |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 461 | static int axi_clkgen_enable(struct clk_hw *clk_hw) |
| 462 | { |
| 463 | struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw); |
| 464 | |
| 465 | axi_clkgen_mmcm_enable(axi_clkgen, true); |
| 466 | |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | static void axi_clkgen_disable(struct clk_hw *clk_hw) |
| 471 | { |
| 472 | struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw); |
| 473 | |
| 474 | axi_clkgen_mmcm_enable(axi_clkgen, false); |
| 475 | } |
| 476 | |
Lars-Peter Clausen | 62d1e78 | 2015-11-30 17:54:56 +0100 | [diff] [blame] | 477 | static int axi_clkgen_set_parent(struct clk_hw *clk_hw, u8 index) |
| 478 | { |
| 479 | struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw); |
| 480 | |
| 481 | axi_clkgen_write(axi_clkgen, AXI_CLKGEN_V2_REG_CLKSEL, index); |
| 482 | |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | static u8 axi_clkgen_get_parent(struct clk_hw *clk_hw) |
| 487 | { |
| 488 | struct axi_clkgen *axi_clkgen = clk_hw_to_axi_clkgen(clk_hw); |
| 489 | unsigned int parent; |
| 490 | |
| 491 | axi_clkgen_read(axi_clkgen, AXI_CLKGEN_V2_REG_CLKSEL, &parent); |
| 492 | |
| 493 | return parent; |
| 494 | } |
| 495 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 496 | static const struct clk_ops axi_clkgen_ops = { |
| 497 | .recalc_rate = axi_clkgen_recalc_rate, |
| 498 | .round_rate = axi_clkgen_round_rate, |
| 499 | .set_rate = axi_clkgen_set_rate, |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 500 | .enable = axi_clkgen_enable, |
| 501 | .disable = axi_clkgen_disable, |
Lars-Peter Clausen | 62d1e78 | 2015-11-30 17:54:56 +0100 | [diff] [blame] | 502 | .set_parent = axi_clkgen_set_parent, |
| 503 | .get_parent = axi_clkgen_get_parent, |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 504 | }; |
| 505 | |
| 506 | static int axi_clkgen_probe(struct platform_device *pdev) |
| 507 | { |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 508 | const struct axi_clkgen_limits *dflt_limits; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 509 | struct axi_clkgen *axi_clkgen; |
| 510 | struct clk_init_data init; |
Lars-Peter Clausen | 62d1e78 | 2015-11-30 17:54:56 +0100 | [diff] [blame] | 511 | const char *parent_names[2]; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 512 | const char *clk_name; |
Lars-Peter Clausen | 62d1e78 | 2015-11-30 17:54:56 +0100 | [diff] [blame] | 513 | unsigned int i; |
Stephen Boyd | e0d30bb | 2016-06-01 16:15:08 -0700 | [diff] [blame] | 514 | int ret; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 515 | |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 516 | dflt_limits = device_get_match_data(&pdev->dev); |
| 517 | if (!dflt_limits) |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 518 | return -ENODEV; |
| 519 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 520 | axi_clkgen = devm_kzalloc(&pdev->dev, sizeof(*axi_clkgen), GFP_KERNEL); |
| 521 | if (!axi_clkgen) |
| 522 | return -ENOMEM; |
| 523 | |
Alexandru Ardelean | 6ba7ea7 | 2021-02-01 17:12:45 +0200 | [diff] [blame] | 524 | axi_clkgen->base = devm_platform_ioremap_resource(pdev, 0); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 525 | if (IS_ERR(axi_clkgen->base)) |
| 526 | return PTR_ERR(axi_clkgen->base); |
| 527 | |
Lars-Peter Clausen | 62d1e78 | 2015-11-30 17:54:56 +0100 | [diff] [blame] | 528 | init.num_parents = of_clk_get_parent_count(pdev->dev.of_node); |
| 529 | if (init.num_parents < 1 || init.num_parents > 2) |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 530 | return -EINVAL; |
| 531 | |
Lars-Peter Clausen | 62d1e78 | 2015-11-30 17:54:56 +0100 | [diff] [blame] | 532 | for (i = 0; i < init.num_parents; i++) { |
| 533 | parent_names[i] = of_clk_get_parent_name(pdev->dev.of_node, i); |
| 534 | if (!parent_names[i]) |
| 535 | return -EINVAL; |
| 536 | } |
| 537 | |
Alexandru Ardelean | ac1ee86 | 2020-12-03 09:40:36 +0200 | [diff] [blame] | 538 | memcpy(&axi_clkgen->limits, dflt_limits, sizeof(axi_clkgen->limits)); |
| 539 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 540 | clk_name = pdev->dev.of_node->name; |
| 541 | of_property_read_string(pdev->dev.of_node, "clock-output-names", |
| 542 | &clk_name); |
| 543 | |
| 544 | init.name = clk_name; |
| 545 | init.ops = &axi_clkgen_ops; |
Lars-Peter Clausen | 62d1e78 | 2015-11-30 17:54:56 +0100 | [diff] [blame] | 546 | init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE; |
| 547 | init.parent_names = parent_names; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 548 | |
Lars-Peter Clausen | 1887c3a | 2014-02-17 10:31:53 +0100 | [diff] [blame] | 549 | axi_clkgen_mmcm_enable(axi_clkgen, false); |
| 550 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 551 | axi_clkgen->clk_hw.init = &init; |
Stephen Boyd | e0d30bb | 2016-06-01 16:15:08 -0700 | [diff] [blame] | 552 | ret = devm_clk_hw_register(&pdev->dev, &axi_clkgen->clk_hw); |
| 553 | if (ret) |
| 554 | return ret; |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 555 | |
Stephen Boyd | e0d30bb | 2016-06-01 16:15:08 -0700 | [diff] [blame] | 556 | return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_simple_get, |
| 557 | &axi_clkgen->clk_hw); |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | static int axi_clkgen_remove(struct platform_device *pdev) |
| 561 | { |
| 562 | of_clk_del_provider(pdev->dev.of_node); |
| 563 | |
| 564 | return 0; |
| 565 | } |
| 566 | |
Alexandru Ardelean | 16214f9 | 2020-12-03 09:40:37 +0200 | [diff] [blame] | 567 | static const struct of_device_id axi_clkgen_ids[] = { |
| 568 | { |
Alexandru Ardelean | da68c30 | 2021-02-01 17:12:43 +0200 | [diff] [blame] | 569 | .compatible = "adi,zynqmp-axi-clkgen-2.00.a", |
| 570 | .data = &axi_clkgen_zynqmp_default_limits, |
| 571 | }, |
| 572 | { |
Alexandru Ardelean | 16214f9 | 2020-12-03 09:40:37 +0200 | [diff] [blame] | 573 | .compatible = "adi,axi-clkgen-2.00.a", |
| 574 | .data = &axi_clkgen_zynq_default_limits, |
| 575 | }, |
| 576 | { } |
| 577 | }; |
| 578 | MODULE_DEVICE_TABLE(of, axi_clkgen_ids); |
| 579 | |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 580 | static struct platform_driver axi_clkgen_driver = { |
| 581 | .driver = { |
| 582 | .name = "adi-axi-clkgen", |
Lars-Peter Clausen | 0e646c5 | 2013-03-11 16:22:29 +0100 | [diff] [blame] | 583 | .of_match_table = axi_clkgen_ids, |
| 584 | }, |
| 585 | .probe = axi_clkgen_probe, |
| 586 | .remove = axi_clkgen_remove, |
| 587 | }; |
| 588 | module_platform_driver(axi_clkgen_driver); |
| 589 | |
| 590 | MODULE_LICENSE("GPL v2"); |
| 591 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| 592 | MODULE_DESCRIPTION("Driver for the Analog Devices' AXI clkgen pcore clock generator"); |