]> git.sur5r.net Git - u-boot/blob - arch/arm/mach-keystone/clock.c
ARM: keystone2: Fix dev and arm speed detection
[u-boot] / arch / arm / mach-keystone / clock.c
1 /*
2  * Keystone2: pll initialization
3  *
4  * (C) Copyright 2012-2014
5  *     Texas Instruments Incorporated, <www.ti.com>
6  *
7  * SPDX-License-Identifier:     GPL-2.0+
8  */
9
10 #include <common.h>
11 #include <asm/arch/clock.h>
12 #include <asm/arch/clock_defs.h>
13
14 /* DEV and ARM speed definitions as specified in DEVSPEED register */
15 int __weak speeds[DEVSPEED_NUMSPDS] = {
16         SPD1000,
17         SPD1200,
18         SPD1350,
19         SPD1400,
20         SPD1500,
21         SPD1400,
22         SPD1350,
23         SPD1200,
24         SPD1000,
25         SPD800,
26 };
27
28 static void wait_for_completion(const struct pll_init_data *data)
29 {
30         int i;
31         for (i = 0; i < 100; i++) {
32                 sdelay(450);
33                 if (!(pllctl_reg_read(data->pll, stat) & PLLSTAT_GOSTAT_MASK))
34                         break;
35         }
36 }
37
38 static inline void bypass_main_pll(const struct pll_init_data *data)
39 {
40         pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLENSRC_MASK |
41                            PLLCTL_PLLEN_MASK);
42
43         /* 4 cycles of reference clock CLKIN*/
44         sdelay(340);
45 }
46
47 static void configure_mult_div(const struct pll_init_data *data)
48 {
49         u32 pllm, plld, bwadj;
50
51         pllm = data->pll_m - 1;
52         plld = (data->pll_d - 1) & CFG_PLLCTL0_PLLD_MASK;
53
54         /* Program Multiplier */
55         if (data->pll == MAIN_PLL)
56                 pllctl_reg_write(data->pll, mult, pllm & PLLM_MULT_LO_MASK);
57
58         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
59                         CFG_PLLCTL0_PLLM_MASK,
60                         pllm << CFG_PLLCTL0_PLLM_SHIFT);
61
62         /* Program BWADJ */
63         bwadj = (data->pll_m - 1) >> 1; /* Divide pllm by 2 */
64         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
65                         CFG_PLLCTL0_BWADJ_MASK,
66                         (bwadj << CFG_PLLCTL0_BWADJ_SHIFT) &
67                         CFG_PLLCTL0_BWADJ_MASK);
68         bwadj = bwadj >> CFG_PLLCTL0_BWADJ_BITS;
69         clrsetbits_le32(keystone_pll_regs[data->pll].reg1,
70                         CFG_PLLCTL1_BWADJ_MASK, bwadj);
71
72         /* Program Divider */
73         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
74                         CFG_PLLCTL0_PLLD_MASK, plld);
75 }
76
77 void configure_main_pll(const struct pll_init_data *data)
78 {
79         u32 tmp, pllod, i, alnctl_val = 0;
80         u32 *offset;
81
82         pllod = data->pll_od - 1;
83
84         /* 100 micro sec for stabilization */
85         sdelay(210000);
86
87         tmp = pllctl_reg_read(data->pll, secctl);
88
89         /* Check for Bypass */
90         if (tmp & SECCTL_BYPASS_MASK) {
91                 setbits_le32(keystone_pll_regs[data->pll].reg1,
92                              CFG_PLLCTL1_ENSAT_MASK);
93
94                 bypass_main_pll(data);
95
96                 /* Powerdown and powerup Main Pll */
97                 pllctl_reg_setbits(data->pll, secctl, SECCTL_BYPASS_MASK);
98                 pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLPWRDN_MASK);
99                 /* 5 micro sec */
100                 sdelay(21000);
101
102                 pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLPWRDN_MASK);
103         } else {
104                 bypass_main_pll(data);
105         }
106
107         configure_mult_div(data);
108
109         /* Program Output Divider */
110         pllctl_reg_rmw(data->pll, secctl, SECCTL_OP_DIV_MASK,
111                        ((pllod << SECCTL_OP_DIV_SHIFT) & SECCTL_OP_DIV_MASK));
112
113         /* Program PLLDIVn */
114         wait_for_completion(data);
115         for (i = 0; i < PLLDIV_MAX; i++) {
116                 if (i < 3)
117                         offset = pllctl_reg(data->pll, div1) + i;
118                 else
119                         offset = pllctl_reg(data->pll, div4) + (i - 3);
120
121                 if (divn_val[i] != -1) {
122                         __raw_writel(divn_val[i] | PLLDIV_ENABLE_MASK, offset);
123                         alnctl_val |= BIT(i);
124                 }
125         }
126
127         if (alnctl_val) {
128                 pllctl_reg_setbits(data->pll, alnctl, alnctl_val);
129                 /*
130                  * Set GOSET bit in PLLCMD to initiate the GO operation
131                  * to change the divide
132                  */
133                 pllctl_reg_setbits(data->pll, cmd, PLLSTAT_GOSTAT_MASK);
134                 wait_for_completion(data);
135         }
136
137         /* Reset PLL */
138         pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLRST_MASK);
139         sdelay(21000);  /* Wait for a minimum of 7 us*/
140         pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLRST_MASK);
141         sdelay(105000); /* Wait for PLL Lock time (min 50 us) */
142
143         /* Enable PLL */
144         pllctl_reg_clrbits(data->pll, secctl, SECCTL_BYPASS_MASK);
145         pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLEN_MASK);
146 }
147
148 void configure_secondary_pll(const struct pll_init_data *data)
149 {
150         int pllod = data->pll_od - 1;
151
152         /* Enable Bypass mode */
153         setbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_ENSAT_MASK);
154         setbits_le32(keystone_pll_regs[data->pll].reg0,
155                      CFG_PLLCTL0_BYPASS_MASK);
156
157         /* Enable Glitch free bypass for ARM PLL */
158         if (cpu_is_k2hk() && data->pll == TETRIS_PLL)
159                 clrbits_le32(KS2_MISC_CTRL, MISC_CTL1_ARM_PLL_EN);
160
161         configure_mult_div(data);
162
163         /* Program Output Divider */
164         clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
165                         CFG_PLLCTL0_CLKOD_MASK,
166                         (pllod << CFG_PLLCTL0_CLKOD_SHIFT) &
167                         CFG_PLLCTL0_CLKOD_MASK);
168
169         /* Reset PLL */
170         setbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_RST_MASK);
171         /* Wait for 5 micro seconds */
172         sdelay(21000);
173
174         /* Select the Output of PASS PLL as input to PASS */
175         if (data->pll == PASS_PLL)
176                 setbits_le32(keystone_pll_regs[data->pll].reg1,
177                              CFG_PLLCTL1_PAPLL_MASK);
178
179         /* Select the Output of ARM PLL as input to ARM */
180         if (data->pll == TETRIS_PLL)
181                 setbits_le32(KS2_MISC_CTRL, MISC_CTL1_ARM_PLL_EN);
182
183         clrbits_le32(keystone_pll_regs[data->pll].reg1, CFG_PLLCTL1_RST_MASK);
184         /* Wait for 500 * REFCLK cucles * (PLLD + 1) */
185         sdelay(105000);
186
187         /* Switch to PLL mode */
188         clrbits_le32(keystone_pll_regs[data->pll].reg0,
189                      CFG_PLLCTL0_BYPASS_MASK);
190 }
191
192 void init_pll(const struct pll_init_data *data)
193 {
194         if (data->pll == MAIN_PLL)
195                 configure_main_pll(data);
196         else
197                 configure_secondary_pll(data);
198
199         /*
200          * This is required to provide a delay between multiple
201          * consequent PPL configurations
202          */
203         sdelay(210000);
204 }
205
206 void init_plls(int num_pll, struct pll_init_data *config)
207 {
208         int i;
209
210         for (i = 0; i < num_pll; i++)
211                 init_pll(&config[i]);
212 }
213
214 static int get_max_speed(u32 val, u32 speed_supported)
215 {
216         int speed;
217
218         /* Left most setbit gives the speed */
219         for (speed = DEVSPEED_NUMSPDS; speed >= 0; speed--) {
220                 if ((val & BIT(speed)) & speed_supported)
221                         return speeds[speed];
222         }
223
224         /* If no bit is set, use SPD800 */
225         return SPD800;
226 }
227
228 static inline u32 read_efuse_bootrom(void)
229 {
230         if (cpu_is_k2hk() && (cpu_revision() <= 1))
231                 return __raw_readl(KS2_REV1_DEVSPEED);
232         else
233                 return __raw_readl(KS2_EFUSE_BOOTROM);
234 }
235
236 int get_max_arm_speed(void)
237 {
238         u32 armspeed = read_efuse_bootrom();
239
240         armspeed = (armspeed & DEVSPEED_ARMSPEED_MASK) >>
241                     DEVSPEED_ARMSPEED_SHIFT;
242
243         return get_max_speed(armspeed, ARM_SUPPORTED_SPEEDS);
244 }
245
246 int get_max_dev_speed(void)
247 {
248         u32 devspeed = read_efuse_bootrom();
249
250         devspeed = (devspeed & DEVSPEED_DEVSPEED_MASK) >>
251                     DEVSPEED_DEVSPEED_SHIFT;
252
253         return get_max_speed(devspeed, DEV_SUPPORTED_SPEEDS);
254 }