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 }
313