1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2016 Marek Vasut <marex@denx.de>
7 #include <clock_legacy.h>
11 #include <asm/addrspace.h>
12 #include <asm/types.h>
13 #include <mach/ar71xx_regs.h>
14 #include <mach/ath79.h>
17 DECLARE_GLOBAL_DATA_PTR;
20 * The math for calculating PLL:
22 * NINT + -------------
23 * XTAL [MHz] 2^(18 - 1)
24 * PLL [MHz] = ------------ * ----------------------
27 * Unfortunatelly, there is no way to reliably compute the variables.
28 * The vendor U-Boot port contains macros for various combinations of
29 * CPU PLL / DDR PLL / AHB bus speed and there is no obvious pattern
32 struct ar934x_pll_config {
36 /* Index 0 is for XTAL=25MHz , Index 1 is for XTAL=40MHz */
40 struct ar934x_clock_config {
45 struct ar934x_pll_config cpu_pll;
46 struct ar934x_pll_config ddr_pll;
49 static const struct ar934x_clock_config ar934x_clock_config[] = {
50 { 300, 300, 150, { 1, 1, 1, { 24, 15 } }, { 1, 1, 1, { 24, 15 } } },
51 { 400, 200, 200, { 1, 1, 1, { 32, 20 } }, { 1, 1, 2, { 32, 20 } } },
52 { 400, 400, 200, { 0, 1, 1, { 32, 20 } }, { 0, 1, 1, { 32, 20 } } },
53 { 500, 400, 200, { 1, 1, 0, { 20, 12 } }, { 0, 1, 1, { 32, 20 } } },
54 { 533, 400, 200, { 1, 1, 0, { 21, 13 } }, { 0, 1, 1, { 32, 20 } } },
55 { 533, 500, 250, { 1, 1, 0, { 21, 13 } }, { 0, 1, 0, { 20, 12 } } },
56 { 560, 480, 240, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 19, 12 } } },
57 { 566, 400, 200, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 16, 10 } } },
58 { 566, 450, 225, { 1, 1, 0, { 22, 14 } }, { 0, 1, 1, { 36, 22 } } },
59 { 566, 475, 237, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 19, 11 } } },
60 { 566, 500, 250, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 20, 12 } } },
61 { 566, 525, 262, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 21, 13 } } },
62 { 566, 550, 275, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 22, 13 } } },
63 { 600, 266, 133, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 21, 16 } } },
64 { 600, 266, 200, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 21, 16 } } },
65 { 600, 300, 150, { 0, 1, 0, { 24, 15 } }, { 0, 1, 1, { 24, 15 } } },
66 { 600, 332, 166, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 26, 16 } } },
67 { 600, 332, 200, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 26, 16 } } },
68 { 600, 400, 200, { 0, 1, 0, { 24, 15 } }, { 0, 1, 1, { 32, 20 } } },
69 { 600, 450, 200, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 18, 20 } } },
70 { 600, 500, 250, { 0, 1, 0, { 24, 15 } }, { 1, 1, 0, { 20, 12 } } },
71 { 600, 525, 262, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 21, 20 } } },
72 { 600, 550, 275, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 22, 20 } } },
73 { 600, 575, 287, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 23, 14 } } },
74 { 600, 600, 300, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 24, 20 } } },
75 { 600, 650, 325, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 26, 20 } } },
76 { 650, 600, 300, { 0, 1, 0, { 26, 15 } }, { 0, 1, 0, { 24, 20 } } },
77 { 700, 400, 200, { 3, 1, 0, { 28, 17 } }, { 0, 1, 1, { 32, 20 } } },
80 static void ar934x_srif_pll_cfg(void __iomem *pll_reg_base, const u32 srif_val)
84 writel(0x10810f00, pll_reg_base + 0x4);
85 writel(srif_val, pll_reg_base + 0x0);
86 writel(0xd0810f00, pll_reg_base + 0x4);
87 writel(0x03000000, pll_reg_base + 0x8);
88 writel(0xd0800f00, pll_reg_base + 0x4);
90 clrbits_be32(pll_reg_base + 0x8, BIT(30));
92 setbits_be32(pll_reg_base + 0x8, BIT(30));
95 wait_for_bit_le32(pll_reg_base + 0xc, BIT(3), 1, 10, 0);
97 clrbits_be32(pll_reg_base + 0x8, BIT(30));
100 /* Check if CPU SRIF PLL locked. */
101 reg = readl(pll_reg_base + 0x8);
102 reg = (reg & 0x7ffff8) >> 3;
103 } while (reg >= 0x40000);
106 void ar934x_pll_init(const u16 cpu_mhz, const u16 ddr_mhz, const u16 ahb_mhz)
108 void __iomem *srif_regs = map_physmem(AR934X_SRIF_BASE,
109 AR934X_SRIF_SIZE, MAP_NOCACHE);
110 void __iomem *pll_regs = map_physmem(AR71XX_PLL_BASE,
111 AR71XX_PLL_SIZE, MAP_NOCACHE);
112 const struct ar934x_pll_config *pll_cfg;
113 int i, pll_nint, pll_refdiv, xtal_40 = 0;
114 u32 reg, cpu_pll, cpu_srif, ddr_pll, ddr_srif;
116 /* Configure SRIF PLL with initial values. */
117 writel(0x13210f00, srif_regs + AR934X_SRIF_CPU_DPLL2_REG);
118 writel(0x03000000, srif_regs + AR934X_SRIF_CPU_DPLL3_REG);
119 writel(0x13210f00, srif_regs + AR934X_SRIF_DDR_DPLL2_REG);
120 writel(0x03000000, srif_regs + AR934X_SRIF_DDR_DPLL3_REG);
121 writel(0x03000000, srif_regs + 0x188); /* Undocumented reg :-) */
123 /* Test for 40MHz XTAL */
124 reg = ath79_get_bootstrap();
125 if (reg & AR934X_BOOTSTRAP_REF_CLK_40) {
127 cpu_srif = 0x41c00000;
128 ddr_srif = 0x41680000;
131 cpu_srif = 0x29c00000;
132 ddr_srif = 0x29680000;
135 /* Locate CPU/DDR PLL configuration */
136 for (i = 0; i < ARRAY_SIZE(ar934x_clock_config); i++) {
137 if (cpu_mhz != ar934x_clock_config[i].cpu_freq)
139 if (ddr_mhz != ar934x_clock_config[i].ddr_freq)
141 if (ahb_mhz != ar934x_clock_config[i].ahb_freq)
145 pll_cfg = &ar934x_clock_config[i].cpu_pll;
146 pll_nint = pll_cfg->nint[xtal_40];
147 pll_refdiv = pll_cfg->refdiv;
149 (pll_nint << AR934X_PLL_CPU_CONFIG_NINT_SHIFT) |
150 (pll_refdiv << AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) |
151 (pll_cfg->range << AR934X_PLL_CPU_CONFIG_RANGE_SHIFT) |
152 (pll_cfg->outdiv << AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT);
154 pll_cfg = &ar934x_clock_config[i].ddr_pll;
155 pll_nint = pll_cfg->nint[xtal_40];
156 pll_refdiv = pll_cfg->refdiv;
158 (pll_nint << AR934X_PLL_DDR_CONFIG_NINT_SHIFT) |
159 (pll_refdiv << AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) |
160 (pll_cfg->range << AR934X_PLL_DDR_CONFIG_RANGE_SHIFT) |
161 (pll_cfg->outdiv << AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT);
165 /* PLL configuration not found, hang. */
166 if (i == ARRAY_SIZE(ar934x_clock_config))
170 setbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
171 AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS);
172 setbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
173 AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS);
174 setbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
175 AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS);
177 /* Configure CPU PLL */
178 writel(cpu_pll | AR934X_PLL_CPU_CONFIG_PLLPWD,
179 pll_regs + AR934X_PLL_CPU_CONFIG_REG);
180 /* Configure DDR PLL */
181 writel(ddr_pll | AR934X_PLL_DDR_CONFIG_PLLPWD,
182 pll_regs + AR934X_PLL_DDR_CONFIG_REG);
183 /* Configure PLL routing */
184 writel(AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS |
185 AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS |
186 AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS |
187 (0 << AR934X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) |
188 (0 << AR934X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) |
189 (1 << AR934X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) |
190 AR934X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL |
191 AR934X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL |
192 AR934X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL,
193 pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
195 /* Configure SRIF PLLs, which is completely undocumented :-) */
196 ar934x_srif_pll_cfg(srif_regs + AR934X_SRIF_CPU_DPLL1_REG, cpu_srif);
197 ar934x_srif_pll_cfg(srif_regs + AR934X_SRIF_DDR_DPLL1_REG, ddr_srif);
199 /* Unset PLL Bypass */
200 clrbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
201 AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS);
202 clrbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
203 AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS);
204 clrbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
205 AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS);
207 /* Enable PLL dithering */
208 writel((1 << AR934X_PLL_DDR_DIT_FRAC_STEP_SHIFT) |
209 (0xf << AR934X_PLL_DDR_DIT_UPD_CNT_SHIFT),
210 pll_regs + AR934X_PLL_DDR_DIT_FRAC_REG);
211 writel(48 << AR934X_PLL_CPU_DIT_UPD_CNT_SHIFT,
212 pll_regs + AR934X_PLL_CPU_DIT_FRAC_REG);
215 static u32 ar934x_get_xtal(void)
219 val = ath79_get_bootstrap();
220 if (val & AR934X_BOOTSTRAP_REF_CLK_40)
226 int get_serial_clock(void)
228 return ar934x_get_xtal();
231 static u32 ar934x_cpupll_to_hz(const u32 regval)
233 const u32 outdiv = (regval >> AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
234 AR934X_PLL_CPU_CONFIG_OUTDIV_MASK;
235 const u32 refdiv = (regval >> AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
236 AR934X_PLL_CPU_CONFIG_REFDIV_MASK;
237 const u32 nint = (regval >> AR934X_PLL_CPU_CONFIG_NINT_SHIFT) &
238 AR934X_PLL_CPU_CONFIG_NINT_MASK;
239 const u32 nfrac = (regval >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
240 AR934X_PLL_CPU_CONFIG_NFRAC_MASK;
241 const u32 xtal = ar934x_get_xtal();
243 return (xtal * (nint + (nfrac >> 9))) / (refdiv * (1 << outdiv));
246 static u32 ar934x_ddrpll_to_hz(const u32 regval)
248 const u32 outdiv = (regval >> AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
249 AR934X_PLL_DDR_CONFIG_OUTDIV_MASK;
250 const u32 refdiv = (regval >> AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
251 AR934X_PLL_DDR_CONFIG_REFDIV_MASK;
252 const u32 nint = (regval >> AR934X_PLL_DDR_CONFIG_NINT_SHIFT) &
253 AR934X_PLL_DDR_CONFIG_NINT_MASK;
254 const u32 nfrac = (regval >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
255 AR934X_PLL_DDR_CONFIG_NFRAC_MASK;
256 const u32 xtal = ar934x_get_xtal();
258 return (xtal * (nint + (nfrac >> 9))) / (refdiv * (1 << outdiv));
261 static void ar934x_update_clock(void)
264 u32 ctrl, cpu, cpupll, ddr, ddrpll;
265 u32 cpudiv, ddrdiv, busdiv;
266 u32 cpuclk, ddrclk, busclk;
268 regs = map_physmem(AR71XX_PLL_BASE, AR71XX_PLL_SIZE,
271 cpu = readl(regs + AR934X_PLL_CPU_CONFIG_REG);
272 ddr = readl(regs + AR934X_PLL_DDR_CONFIG_REG);
273 ctrl = readl(regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
275 cpupll = ar934x_cpupll_to_hz(cpu);
276 ddrpll = ar934x_ddrpll_to_hz(ddr);
278 if (ctrl & AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS)
279 cpuclk = ar934x_get_xtal();
280 else if (ctrl & AR934X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL)
285 if (ctrl & AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS)
286 ddrclk = ar934x_get_xtal();
287 else if (ctrl & AR934X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL)
292 if (ctrl & AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS)
293 busclk = ar934x_get_xtal();
294 else if (ctrl & AR934X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL)
299 cpudiv = (ctrl >> AR934X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) &
300 AR934X_PLL_CLK_CTRL_CPU_POST_DIV_MASK;
301 ddrdiv = (ctrl >> AR934X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) &
302 AR934X_PLL_CLK_CTRL_DDR_POST_DIV_MASK;
303 busdiv = (ctrl >> AR934X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) &
304 AR934X_PLL_CLK_CTRL_AHB_POST_DIV_MASK;
306 gd->cpu_clk = cpuclk / (cpudiv + 1);
307 gd->mem_clk = ddrclk / (ddrdiv + 1);
308 gd->bus_clk = busclk / (busdiv + 1);
311 ulong get_bus_freq(ulong dummy)
313 ar934x_update_clock();
317 ulong get_ddr_freq(ulong dummy)
319 ar934x_update_clock();
323 int do_ar934x_showclk(struct cmd_tbl *cmdtp, int flag, int argc,
326 ar934x_update_clock();
327 printf("CPU: %8ld MHz\n", gd->cpu_clk / 1000000);
328 printf("Memory: %8ld MHz\n", gd->mem_clk / 1000000);
329 printf("AHB: %8ld MHz\n", gd->bus_clk / 1000000);
334 clocks, CONFIG_SYS_MAXARGS, 1, do_ar934x_showclk,