1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2016 Marek Vasut <marex@denx.de>
7 #include <clock_legacy.h>
10 #include <asm/addrspace.h>
11 #include <asm/types.h>
12 #include <mach/ar71xx_regs.h>
13 #include <mach/ath79.h>
16 DECLARE_GLOBAL_DATA_PTR;
19 * The math for calculating PLL:
21 * NINT + -------------
22 * XTAL [MHz] 2^(18 - 1)
23 * PLL [MHz] = ------------ * ----------------------
26 * Unfortunatelly, there is no way to reliably compute the variables.
27 * The vendor U-Boot port contains macros for various combinations of
28 * CPU PLL / DDR PLL / AHB bus speed and there is no obvious pattern
31 struct ar934x_pll_config {
35 /* Index 0 is for XTAL=25MHz , Index 1 is for XTAL=40MHz */
39 struct ar934x_clock_config {
44 struct ar934x_pll_config cpu_pll;
45 struct ar934x_pll_config ddr_pll;
48 static const struct ar934x_clock_config ar934x_clock_config[] = {
49 { 300, 300, 150, { 1, 1, 1, { 24, 15 } }, { 1, 1, 1, { 24, 15 } } },
50 { 400, 200, 200, { 1, 1, 1, { 32, 20 } }, { 1, 1, 2, { 32, 20 } } },
51 { 400, 400, 200, { 0, 1, 1, { 32, 20 } }, { 0, 1, 1, { 32, 20 } } },
52 { 500, 400, 200, { 1, 1, 0, { 20, 12 } }, { 0, 1, 1, { 32, 20 } } },
53 { 533, 400, 200, { 1, 1, 0, { 21, 13 } }, { 0, 1, 1, { 32, 20 } } },
54 { 533, 500, 250, { 1, 1, 0, { 21, 13 } }, { 0, 1, 0, { 20, 12 } } },
55 { 560, 480, 240, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 19, 12 } } },
56 { 566, 400, 200, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 16, 10 } } },
57 { 566, 450, 225, { 1, 1, 0, { 22, 14 } }, { 0, 1, 1, { 36, 22 } } },
58 { 566, 475, 237, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 19, 11 } } },
59 { 566, 500, 250, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 20, 12 } } },
60 { 566, 525, 262, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 21, 13 } } },
61 { 566, 550, 275, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 22, 13 } } },
62 { 600, 266, 133, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 21, 16 } } },
63 { 600, 266, 200, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 21, 16 } } },
64 { 600, 300, 150, { 0, 1, 0, { 24, 15 } }, { 0, 1, 1, { 24, 15 } } },
65 { 600, 332, 166, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 26, 16 } } },
66 { 600, 332, 200, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 26, 16 } } },
67 { 600, 400, 200, { 0, 1, 0, { 24, 15 } }, { 0, 1, 1, { 32, 20 } } },
68 { 600, 450, 200, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 18, 20 } } },
69 { 600, 500, 250, { 0, 1, 0, { 24, 15 } }, { 1, 1, 0, { 20, 12 } } },
70 { 600, 525, 262, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 21, 20 } } },
71 { 600, 550, 275, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 22, 20 } } },
72 { 600, 575, 287, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 23, 14 } } },
73 { 600, 600, 300, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 24, 20 } } },
74 { 600, 650, 325, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 26, 20 } } },
75 { 650, 600, 300, { 0, 1, 0, { 26, 15 } }, { 0, 1, 0, { 24, 20 } } },
76 { 700, 400, 200, { 3, 1, 0, { 28, 17 } }, { 0, 1, 1, { 32, 20 } } },
79 static void ar934x_srif_pll_cfg(void __iomem *pll_reg_base, const u32 srif_val)
83 writel(0x10810f00, pll_reg_base + 0x4);
84 writel(srif_val, pll_reg_base + 0x0);
85 writel(0xd0810f00, pll_reg_base + 0x4);
86 writel(0x03000000, pll_reg_base + 0x8);
87 writel(0xd0800f00, pll_reg_base + 0x4);
89 clrbits_be32(pll_reg_base + 0x8, BIT(30));
91 setbits_be32(pll_reg_base + 0x8, BIT(30));
94 wait_for_bit_le32(pll_reg_base + 0xc, BIT(3), 1, 10, 0);
96 clrbits_be32(pll_reg_base + 0x8, BIT(30));
99 /* Check if CPU SRIF PLL locked. */
100 reg = readl(pll_reg_base + 0x8);
101 reg = (reg & 0x7ffff8) >> 3;
102 } while (reg >= 0x40000);
105 void ar934x_pll_init(const u16 cpu_mhz, const u16 ddr_mhz, const u16 ahb_mhz)
107 void __iomem *srif_regs = map_physmem(AR934X_SRIF_BASE,
108 AR934X_SRIF_SIZE, MAP_NOCACHE);
109 void __iomem *pll_regs = map_physmem(AR71XX_PLL_BASE,
110 AR71XX_PLL_SIZE, MAP_NOCACHE);
111 const struct ar934x_pll_config *pll_cfg;
112 int i, pll_nint, pll_refdiv, xtal_40 = 0;
113 u32 reg, cpu_pll, cpu_srif, ddr_pll, ddr_srif;
115 /* Configure SRIF PLL with initial values. */
116 writel(0x13210f00, srif_regs + AR934X_SRIF_CPU_DPLL2_REG);
117 writel(0x03000000, srif_regs + AR934X_SRIF_CPU_DPLL3_REG);
118 writel(0x13210f00, srif_regs + AR934X_SRIF_DDR_DPLL2_REG);
119 writel(0x03000000, srif_regs + AR934X_SRIF_DDR_DPLL3_REG);
120 writel(0x03000000, srif_regs + 0x188); /* Undocumented reg :-) */
122 /* Test for 40MHz XTAL */
123 reg = ath79_get_bootstrap();
124 if (reg & AR934X_BOOTSTRAP_REF_CLK_40) {
126 cpu_srif = 0x41c00000;
127 ddr_srif = 0x41680000;
130 cpu_srif = 0x29c00000;
131 ddr_srif = 0x29680000;
134 /* Locate CPU/DDR PLL configuration */
135 for (i = 0; i < ARRAY_SIZE(ar934x_clock_config); i++) {
136 if (cpu_mhz != ar934x_clock_config[i].cpu_freq)
138 if (ddr_mhz != ar934x_clock_config[i].ddr_freq)
140 if (ahb_mhz != ar934x_clock_config[i].ahb_freq)
144 pll_cfg = &ar934x_clock_config[i].cpu_pll;
145 pll_nint = pll_cfg->nint[xtal_40];
146 pll_refdiv = pll_cfg->refdiv;
148 (pll_nint << AR934X_PLL_CPU_CONFIG_NINT_SHIFT) |
149 (pll_refdiv << AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) |
150 (pll_cfg->range << AR934X_PLL_CPU_CONFIG_RANGE_SHIFT) |
151 (pll_cfg->outdiv << AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT);
153 pll_cfg = &ar934x_clock_config[i].ddr_pll;
154 pll_nint = pll_cfg->nint[xtal_40];
155 pll_refdiv = pll_cfg->refdiv;
157 (pll_nint << AR934X_PLL_DDR_CONFIG_NINT_SHIFT) |
158 (pll_refdiv << AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) |
159 (pll_cfg->range << AR934X_PLL_DDR_CONFIG_RANGE_SHIFT) |
160 (pll_cfg->outdiv << AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT);
164 /* PLL configuration not found, hang. */
165 if (i == ARRAY_SIZE(ar934x_clock_config))
169 setbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
170 AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS);
171 setbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
172 AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS);
173 setbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
174 AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS);
176 /* Configure CPU PLL */
177 writel(cpu_pll | AR934X_PLL_CPU_CONFIG_PLLPWD,
178 pll_regs + AR934X_PLL_CPU_CONFIG_REG);
179 /* Configure DDR PLL */
180 writel(ddr_pll | AR934X_PLL_DDR_CONFIG_PLLPWD,
181 pll_regs + AR934X_PLL_DDR_CONFIG_REG);
182 /* Configure PLL routing */
183 writel(AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS |
184 AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS |
185 AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS |
186 (0 << AR934X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) |
187 (0 << AR934X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) |
188 (1 << AR934X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) |
189 AR934X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL |
190 AR934X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL |
191 AR934X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL,
192 pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
194 /* Configure SRIF PLLs, which is completely undocumented :-) */
195 ar934x_srif_pll_cfg(srif_regs + AR934X_SRIF_CPU_DPLL1_REG, cpu_srif);
196 ar934x_srif_pll_cfg(srif_regs + AR934X_SRIF_DDR_DPLL1_REG, ddr_srif);
198 /* Unset PLL Bypass */
199 clrbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
200 AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS);
201 clrbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
202 AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS);
203 clrbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
204 AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS);
206 /* Enable PLL dithering */
207 writel((1 << AR934X_PLL_DDR_DIT_FRAC_STEP_SHIFT) |
208 (0xf << AR934X_PLL_DDR_DIT_UPD_CNT_SHIFT),
209 pll_regs + AR934X_PLL_DDR_DIT_FRAC_REG);
210 writel(48 << AR934X_PLL_CPU_DIT_UPD_CNT_SHIFT,
211 pll_regs + AR934X_PLL_CPU_DIT_FRAC_REG);
214 static u32 ar934x_get_xtal(void)
218 val = ath79_get_bootstrap();
219 if (val & AR934X_BOOTSTRAP_REF_CLK_40)
225 int get_serial_clock(void)
227 return ar934x_get_xtal();
230 static u32 ar934x_cpupll_to_hz(const u32 regval)
232 const u32 outdiv = (regval >> AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
233 AR934X_PLL_CPU_CONFIG_OUTDIV_MASK;
234 const u32 refdiv = (regval >> AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
235 AR934X_PLL_CPU_CONFIG_REFDIV_MASK;
236 const u32 nint = (regval >> AR934X_PLL_CPU_CONFIG_NINT_SHIFT) &
237 AR934X_PLL_CPU_CONFIG_NINT_MASK;
238 const u32 nfrac = (regval >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
239 AR934X_PLL_CPU_CONFIG_NFRAC_MASK;
240 const u32 xtal = ar934x_get_xtal();
242 return (xtal * (nint + (nfrac >> 9))) / (refdiv * (1 << outdiv));
245 static u32 ar934x_ddrpll_to_hz(const u32 regval)
247 const u32 outdiv = (regval >> AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
248 AR934X_PLL_DDR_CONFIG_OUTDIV_MASK;
249 const u32 refdiv = (regval >> AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
250 AR934X_PLL_DDR_CONFIG_REFDIV_MASK;
251 const u32 nint = (regval >> AR934X_PLL_DDR_CONFIG_NINT_SHIFT) &
252 AR934X_PLL_DDR_CONFIG_NINT_MASK;
253 const u32 nfrac = (regval >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
254 AR934X_PLL_DDR_CONFIG_NFRAC_MASK;
255 const u32 xtal = ar934x_get_xtal();
257 return (xtal * (nint + (nfrac >> 9))) / (refdiv * (1 << outdiv));
260 static void ar934x_update_clock(void)
263 u32 ctrl, cpu, cpupll, ddr, ddrpll;
264 u32 cpudiv, ddrdiv, busdiv;
265 u32 cpuclk, ddrclk, busclk;
267 regs = map_physmem(AR71XX_PLL_BASE, AR71XX_PLL_SIZE,
270 cpu = readl(regs + AR934X_PLL_CPU_CONFIG_REG);
271 ddr = readl(regs + AR934X_PLL_DDR_CONFIG_REG);
272 ctrl = readl(regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
274 cpupll = ar934x_cpupll_to_hz(cpu);
275 ddrpll = ar934x_ddrpll_to_hz(ddr);
277 if (ctrl & AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS)
278 cpuclk = ar934x_get_xtal();
279 else if (ctrl & AR934X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL)
284 if (ctrl & AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS)
285 ddrclk = ar934x_get_xtal();
286 else if (ctrl & AR934X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL)
291 if (ctrl & AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS)
292 busclk = ar934x_get_xtal();
293 else if (ctrl & AR934X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL)
298 cpudiv = (ctrl >> AR934X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) &
299 AR934X_PLL_CLK_CTRL_CPU_POST_DIV_MASK;
300 ddrdiv = (ctrl >> AR934X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) &
301 AR934X_PLL_CLK_CTRL_DDR_POST_DIV_MASK;
302 busdiv = (ctrl >> AR934X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) &
303 AR934X_PLL_CLK_CTRL_AHB_POST_DIV_MASK;
305 gd->cpu_clk = cpuclk / (cpudiv + 1);
306 gd->mem_clk = ddrclk / (ddrdiv + 1);
307 gd->bus_clk = busclk / (busdiv + 1);
310 ulong get_bus_freq(ulong dummy)
312 ar934x_update_clock();
316 ulong get_ddr_freq(ulong dummy)
318 ar934x_update_clock();
322 int do_ar934x_showclk(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
324 ar934x_update_clock();
325 printf("CPU: %8ld MHz\n", gd->cpu_clk / 1000000);
326 printf("Memory: %8ld MHz\n", gd->mem_clk / 1000000);
327 printf("AHB: %8ld MHz\n", gd->bus_clk / 1000000);
332 clocks, CONFIG_SYS_MAXARGS, 1, do_ar934x_showclk,