SPDX: Convert all of our single license tags to Linux Kernel style
[oweals/u-boot.git] / arch / arm / mach-davinci / da850_lowlevel.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * SoC-specific lowlevel code for DA850
4  *
5  * Copyright (C) 2011
6  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
7  */
8 #include <common.h>
9 #include <nand.h>
10 #include <ns16550.h>
11 #include <post.h>
12 #include <asm/arch/da850_lowlevel.h>
13 #include <asm/arch/hardware.h>
14 #include <asm/arch/davinci_misc.h>
15 #include <asm/arch/ddr2_defs.h>
16 #include <asm/ti-common/davinci_nand.h>
17 #include <asm/arch/pll_defs.h>
18
19 void davinci_enable_uart0(void)
20 {
21         lpsc_on(DAVINCI_LPSC_UART0);
22
23         /* Bringup UART0 out of reset */
24         REG(UART0_PWREMU_MGMT) = 0x00006001;
25 }
26
27 #if defined(CONFIG_SYS_DA850_PLL_INIT)
28 static void da850_waitloop(unsigned long loopcnt)
29 {
30         unsigned long   i;
31
32         for (i = 0; i < loopcnt; i++)
33                 asm("   NOP");
34 }
35
36 static int da850_pll_init(struct davinci_pllc_regs *reg, unsigned long pllmult)
37 {
38         if (reg == davinci_pllc0_regs)
39                 /* Unlock PLL registers. */
40                 clrbits_le32(&davinci_syscfg_regs->cfgchip0, PLL_MASTER_LOCK);
41
42         /*
43          * Set PLLENSRC '0',bit 5, PLL Enable(PLLEN) selection is controlled
44          * through MMR
45          */
46         clrbits_le32(&reg->pllctl, PLLCTL_PLLENSRC);
47         /* PLLCTL.EXTCLKSRC bit 9 should be left at 0 for Freon */
48         clrbits_le32(&reg->pllctl, PLLCTL_EXTCLKSRC);
49
50         /* Set PLLEN=0 => PLL BYPASS MODE */
51         clrbits_le32(&reg->pllctl, PLLCTL_PLLEN);
52
53         da850_waitloop(150);
54
55         if (reg == davinci_pllc0_regs) {
56                 /*
57                  * Select the Clock Mode bit 8 as External Clock or On Chip
58                  * Oscilator
59                  */
60                 dv_maskbits(&reg->pllctl, ~PLLCTL_RES_9);
61                 setbits_le32(&reg->pllctl,
62                         (CONFIG_SYS_DV_CLKMODE << PLLCTL_CLOCK_MODE_SHIFT));
63         }
64
65         /* Clear PLLRST bit to reset the PLL */
66         clrbits_le32(&reg->pllctl, PLLCTL_PLLRST);
67
68         /* Disable the PLL output */
69         setbits_le32(&reg->pllctl, PLLCTL_PLLDIS);
70
71         /* PLL initialization sequence */
72         /*
73          * Power up the PLL- PWRDN bit set to 0 to bring the PLL out of
74          * power down bit
75          */
76         clrbits_le32(&reg->pllctl, PLLCTL_PLLPWRDN);
77
78         /* Enable the PLL from Disable Mode PLLDIS bit to 0 */
79         clrbits_le32(&reg->pllctl, PLLCTL_PLLDIS);
80
81 #if defined(CONFIG_SYS_DA850_PLL0_PREDIV)
82         /* program the prediv */
83         if (reg == davinci_pllc0_regs && CONFIG_SYS_DA850_PLL0_PREDIV)
84                 writel((PLL_DIVEN | CONFIG_SYS_DA850_PLL0_PREDIV),
85                         &reg->prediv);
86 #endif
87
88         /* Program the required multiplier value in PLLM */
89         writel(pllmult, &reg->pllm);
90
91         /* program the postdiv */
92         if (reg == davinci_pllc0_regs)
93                 writel((PLL_POSTDEN | CONFIG_SYS_DA850_PLL0_POSTDIV),
94                         &reg->postdiv);
95         else
96                 writel((PLL_POSTDEN | CONFIG_SYS_DA850_PLL1_POSTDIV),
97                         &reg->postdiv);
98
99         /*
100          * Check for the GOSTAT bit in PLLSTAT to clear to 0 to indicate that
101          * no GO operation is currently in progress
102          */
103         while ((readl(&reg->pllstat) & PLLCMD_GOSTAT) == PLLCMD_GOSTAT)
104                 ;
105
106         if (reg == davinci_pllc0_regs) {
107                 writel(CONFIG_SYS_DA850_PLL0_PLLDIV1, &reg->plldiv1);
108                 writel(CONFIG_SYS_DA850_PLL0_PLLDIV2, &reg->plldiv2);
109                 writel(CONFIG_SYS_DA850_PLL0_PLLDIV3, &reg->plldiv3);
110                 writel(CONFIG_SYS_DA850_PLL0_PLLDIV4, &reg->plldiv4);
111                 writel(CONFIG_SYS_DA850_PLL0_PLLDIV5, &reg->plldiv5);
112                 writel(CONFIG_SYS_DA850_PLL0_PLLDIV6, &reg->plldiv6);
113                 writel(CONFIG_SYS_DA850_PLL0_PLLDIV7, &reg->plldiv7);
114         } else {
115                 writel(CONFIG_SYS_DA850_PLL1_PLLDIV1, &reg->plldiv1);
116                 writel(CONFIG_SYS_DA850_PLL1_PLLDIV2, &reg->plldiv2);
117                 writel(CONFIG_SYS_DA850_PLL1_PLLDIV3, &reg->plldiv3);
118         }
119
120         /*
121          * Set the GOSET bit in PLLCMD to 1 to initiate a new divider
122          * transition.
123          */
124         setbits_le32(&reg->pllcmd, PLLCMD_GOSTAT);
125
126         /*
127          * Wait for the GOSTAT bit in PLLSTAT to clear to 0
128          * (completion of phase alignment).
129          */
130         while ((readl(&reg->pllstat) & PLLCMD_GOSTAT) == PLLCMD_GOSTAT)
131                 ;
132
133         /* Wait for PLL to reset properly. See PLL spec for PLL reset time */
134         da850_waitloop(200);
135
136         /* Set the PLLRST bit in PLLCTL to 1 to bring the PLL out of reset */
137         setbits_le32(&reg->pllctl, PLLCTL_PLLRST);
138
139         /* Wait for PLL to lock. See PLL spec for PLL lock time */
140         da850_waitloop(2400);
141
142         /*
143          * Set the PLLEN bit in PLLCTL to 1 to remove the PLL from bypass
144          * mode
145          */
146         setbits_le32(&reg->pllctl, PLLCTL_PLLEN);
147
148
149         /*
150          * clear EMIFA and EMIFB clock source settings, let them
151          * run off SYSCLK
152          */
153         if (reg == davinci_pllc0_regs)
154                 dv_maskbits(&davinci_syscfg_regs->cfgchip3,
155                         ~(PLL_SCSCFG3_DIV45PENA | PLL_SCSCFG3_EMA_CLKSRC));
156
157         return 0;
158 }
159 #endif /* CONFIG_SYS_DA850_PLL_INIT */
160
161 #if defined(CONFIG_SYS_DA850_DDR_INIT)
162 static int da850_ddr_setup(void)
163 {
164         unsigned long   tmp;
165
166         /* Enable the Clock to DDR2/mDDR */
167         lpsc_on(DAVINCI_LPSC_DDR_EMIF);
168
169         tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
170         if ((tmp & VTP_POWERDWN) == VTP_POWERDWN) {
171                 /* Begin VTP Calibration */
172                 clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
173                 clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
174                 setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
175                 clrbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
176                 setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_CLKRZ);
177
178                 /* Polling READY bit to see when VTP calibration is done */
179                 tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
180                 while ((tmp & VTP_READY) != VTP_READY)
181                         tmp = readl(&davinci_syscfg1_regs->vtpio_ctl);
182
183                 setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_LOCK);
184                 setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_POWERDWN);
185         }
186         setbits_le32(&davinci_syscfg1_regs->vtpio_ctl, VTP_IOPWRDWN);
187         writel(CONFIG_SYS_DA850_DDR2_DDRPHYCR, &dv_ddr2_regs_ctrl->ddrphycr);
188
189         if (CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT)) {
190                 /* DDR2 */
191                 clrbits_le32(&davinci_syscfg1_regs->ddr_slew,
192                         (1 << DDR_SLEW_DDR_PDENA_BIT) |
193                         (1 << DDR_SLEW_CMOSEN_BIT));
194         } else {
195                 /* MOBILE DDR */
196                 setbits_le32(&davinci_syscfg1_regs->ddr_slew,
197                         (1 << DDR_SLEW_DDR_PDENA_BIT) |
198                         (1 << DDR_SLEW_CMOSEN_BIT));
199         }
200
201         /*
202          * SDRAM Configuration Register (SDCR):
203          * First set the BOOTUNLOCK bit to make configuration bits
204          * writeable.
205          */
206         setbits_le32(&dv_ddr2_regs_ctrl->sdbcr, DV_DDR_BOOTUNLOCK);
207
208         /*
209          * Write the new value of these bits and clear BOOTUNLOCK.
210          * At the same time, set the TIMUNLOCK bit to allow changing
211          * the timing registers
212          */
213         tmp = CONFIG_SYS_DA850_DDR2_SDBCR;
214         tmp &= ~DV_DDR_BOOTUNLOCK;
215         tmp |= DV_DDR_TIMUNLOCK;
216         writel(tmp, &dv_ddr2_regs_ctrl->sdbcr);
217
218         /* write memory configuration and timing */
219         if (!(CONFIG_SYS_DA850_DDR2_SDBCR & (1 << DV_DDR_SDCR_DDR2EN_SHIFT))) {
220                 /* MOBILE DDR only*/
221                 writel(CONFIG_SYS_DA850_DDR2_SDBCR2,
222                         &dv_ddr2_regs_ctrl->sdbcr2);
223         }
224         writel(CONFIG_SYS_DA850_DDR2_SDTIMR, &dv_ddr2_regs_ctrl->sdtimr);
225         writel(CONFIG_SYS_DA850_DDR2_SDTIMR2, &dv_ddr2_regs_ctrl->sdtimr2);
226
227         /* clear the TIMUNLOCK bit and write the value of the CL field */
228         tmp &= ~DV_DDR_TIMUNLOCK;
229         writel(tmp, &dv_ddr2_regs_ctrl->sdbcr);
230
231         /*
232          * LPMODEN and MCLKSTOPEN must be set!
233          * Without this bits set, PSC don;t switch states !!
234          */
235         writel(CONFIG_SYS_DA850_DDR2_SDRCR |
236                 (1 << DV_DDR_SRCR_LPMODEN_SHIFT) |
237                 (1 << DV_DDR_SRCR_MCLKSTOPEN_SHIFT),
238                 &dv_ddr2_regs_ctrl->sdrcr);
239
240         /* SyncReset the Clock to EMIF3A SDRAM */
241         lpsc_syncreset(DAVINCI_LPSC_DDR_EMIF);
242         /* Enable the Clock to EMIF3A SDRAM */
243         lpsc_on(DAVINCI_LPSC_DDR_EMIF);
244
245         /* disable self refresh */
246         clrbits_le32(&dv_ddr2_regs_ctrl->sdrcr,
247                 DV_DDR_SDRCR_LPMODEN | DV_DDR_SDRCR_MCLKSTOPEN);
248         writel(CONFIG_SYS_DA850_DDR2_PBBPR, &dv_ddr2_regs_ctrl->pbbpr);
249
250         return 0;
251 }
252 #endif /* CONFIG_SYS_DA850_DDR_INIT */
253
254 __attribute__((weak))
255 void board_gpio_init(void)
256 {
257         return;
258 }
259
260 int arch_cpu_init(void)
261 {
262         /* Unlock kick registers */
263         writel(DV_SYSCFG_KICK0_UNLOCK, &davinci_syscfg_regs->kick0);
264         writel(DV_SYSCFG_KICK1_UNLOCK, &davinci_syscfg_regs->kick1);
265
266         dv_maskbits(&davinci_syscfg_regs->suspsrc,
267                 CONFIG_SYS_DA850_SYSCFG_SUSPSRC);
268
269         /* configure pinmux settings */
270         if (davinci_configure_pin_mux_items(pinmuxes, pinmuxes_size))
271                 return 1;
272
273 #if defined(CONFIG_SYS_DA850_PLL_INIT)
274         /* PLL setup */
275         da850_pll_init(davinci_pllc0_regs, CONFIG_SYS_DA850_PLL0_PLLM);
276         da850_pll_init(davinci_pllc1_regs, CONFIG_SYS_DA850_PLL1_PLLM);
277 #endif
278         /* setup CSn config */
279 #if defined(CONFIG_SYS_DA850_CS2CFG)
280         writel(CONFIG_SYS_DA850_CS2CFG, &davinci_emif_regs->ab1cr);
281 #endif
282 #if defined(CONFIG_SYS_DA850_CS3CFG)
283         writel(CONFIG_SYS_DA850_CS3CFG, &davinci_emif_regs->ab2cr);
284 #endif
285
286         da8xx_configure_lpsc_items(lpsc, lpsc_size);
287
288         /* GPIO setup */
289         board_gpio_init();
290
291
292         NS16550_init((NS16550_t)(CONFIG_SYS_NS16550_COM1),
293                         CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE);
294
295         /*
296          * Fix Power and Emulation Management Register
297          * see sprufw3a.pdf page 37 Table 24
298          */
299         writel((DAVINCI_UART_PWREMU_MGMT_FREE | DAVINCI_UART_PWREMU_MGMT_URRST |
300                 DAVINCI_UART_PWREMU_MGMT_UTRST),
301 #if (CONFIG_SYS_NS16550_COM1 == DAVINCI_UART0_BASE)
302                &davinci_uart0_ctrl_regs->pwremu_mgmt);
303 #else
304                &davinci_uart2_ctrl_regs->pwremu_mgmt);
305 #endif
306
307 #if defined(CONFIG_SYS_DA850_DDR_INIT)
308         da850_ddr_setup();
309 #endif
310
311         return 0;
312 }