mmc: Tegra2: SD/MMC driver for Seaboard - eMMC on SDMMC4, SDIO on SDMMC3
[platform/kernel/u-boot.git] / board / nvidia / common / board.c
1 /*
2  *  (C) Copyright 2010,2011
3  *  NVIDIA Corporation <www.nvidia.com>
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23
24 #include <common.h>
25 #include <ns16550.h>
26 #include <asm/io.h>
27 #include <asm/arch/tegra2.h>
28 #include <asm/arch/sys_proto.h>
29
30 #include <asm/arch/clk_rst.h>
31 #include <asm/arch/pinmux.h>
32 #include <asm/arch/uart.h>
33 #include "board.h"
34
35 #ifdef CONFIG_TEGRA2_MMC
36 #include <mmc.h>
37 #endif
38
39 DECLARE_GLOBAL_DATA_PTR;
40
41 const struct tegra2_sysinfo sysinfo = {
42         CONFIG_TEGRA2_BOARD_STRING
43 };
44
45 #ifdef CONFIG_BOARD_EARLY_INIT_F
46 int board_early_init_f(void)
47 {
48         /* Initialize periph clocks */
49         clock_init();
50
51         /* Initialize periph pinmuxes */
52         pinmux_init();
53
54         /* Initialize periph GPIOs */
55         gpio_init();
56
57         /* Init UART, scratch regs, and start CPU */
58         tegra2_start();
59         return 0;
60 }
61 #endif  /* EARLY_INIT */
62
63 /*
64  * Routine: timer_init
65  * Description: init the timestamp and lastinc value
66  */
67 int timer_init(void)
68 {
69         reset_timer();
70         return 0;
71 }
72
73 /*
74  * Routine: clock_init_uart
75  * Description: init the PLL and clock for the UART(s)
76  */
77 static void clock_init_uart(void)
78 {
79         struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
80         u32 reg;
81
82         reg = readl(&clkrst->crc_pllp_base);
83         if (!(reg & PLL_BASE_OVRRIDE)) {
84                 /* Override pllp setup for 216MHz operation. */
85                 reg = (PLL_BYPASS | PLL_BASE_OVRRIDE | PLL_DIVP);
86                 reg |= (((NVRM_PLLP_FIXED_FREQ_KHZ/500) << 8) | PLL_DIVM);
87                 writel(reg, &clkrst->crc_pllp_base);
88
89                 reg |= PLL_ENABLE;
90                 writel(reg, &clkrst->crc_pllp_base);
91
92                 reg &= ~PLL_BYPASS;
93                 writel(reg, &clkrst->crc_pllp_base);
94         }
95
96         /* Now do the UART reset/clock enable */
97 #if defined(CONFIG_TEGRA2_ENABLE_UARTA)
98         /* Assert Reset to UART */
99         reg = readl(&clkrst->crc_rst_dev_l);
100         reg |= SWR_UARTA_RST;           /* SWR_UARTA_RST = 1 */
101         writel(reg, &clkrst->crc_rst_dev_l);
102
103         /* Enable clk to UART */
104         reg = readl(&clkrst->crc_clk_out_enb_l);
105         reg |= CLK_ENB_UARTA;           /* CLK_ENB_UARTA = 1 */
106         writel(reg, &clkrst->crc_clk_out_enb_l);
107
108         /* Enable pllp_out0 to UART */
109         reg = readl(&clkrst->crc_clk_src_uarta);
110         reg &= 0x3FFFFFFF;      /* UARTA_CLK_SRC = 00, PLLP_OUT0 */
111         writel(reg, &clkrst->crc_clk_src_uarta);
112
113         /* wait for 2us */
114         udelay(2);
115
116         /* De-assert reset to UART */
117         reg = readl(&clkrst->crc_rst_dev_l);
118         reg &= ~SWR_UARTA_RST;          /* SWR_UARTA_RST = 0 */
119         writel(reg, &clkrst->crc_rst_dev_l);
120 #endif  /* CONFIG_TEGRA2_ENABLE_UARTA */
121 #if defined(CONFIG_TEGRA2_ENABLE_UARTD)
122         /* Assert Reset to UART */
123         reg = readl(&clkrst->crc_rst_dev_u);
124         reg |= SWR_UARTD_RST;           /* SWR_UARTD_RST = 1 */
125         writel(reg, &clkrst->crc_rst_dev_u);
126
127         /* Enable clk to UART */
128         reg = readl(&clkrst->crc_clk_out_enb_u);
129         reg |= CLK_ENB_UARTD;           /* CLK_ENB_UARTD = 1 */
130         writel(reg, &clkrst->crc_clk_out_enb_u);
131
132         /* Enable pllp_out0 to UART */
133         reg = readl(&clkrst->crc_clk_src_uartd);
134         reg &= 0x3FFFFFFF;      /* UARTD_CLK_SRC = 00, PLLP_OUT0 */
135         writel(reg, &clkrst->crc_clk_src_uartd);
136
137         /* wait for 2us */
138         udelay(2);
139
140         /* De-assert reset to UART */
141         reg = readl(&clkrst->crc_rst_dev_u);
142         reg &= ~SWR_UARTD_RST;          /* SWR_UARTD_RST = 0 */
143         writel(reg, &clkrst->crc_rst_dev_u);
144 #endif  /* CONFIG_TEGRA2_ENABLE_UARTD */
145 }
146
147 /*
148  * Routine: pin_mux_uart
149  * Description: setup the pin muxes/tristate values for the UART(s)
150  */
151 static void pin_mux_uart(void)
152 {
153         struct pmux_tri_ctlr *pmt = (struct pmux_tri_ctlr *)NV_PA_APB_MISC_BASE;
154         u32 reg;
155
156 #if defined(CONFIG_TEGRA2_ENABLE_UARTA)
157         reg = readl(&pmt->pmt_ctl_c);
158         reg &= 0xFFF0FFFF;      /* IRRX_/IRTX_SEL [19:16] = 00 UARTA */
159         writel(reg, &pmt->pmt_ctl_c);
160
161         reg = readl(&pmt->pmt_tri_a);
162         reg &= ~Z_IRRX;         /* Z_IRRX = normal (0) */
163         reg &= ~Z_IRTX;         /* Z_IRTX = normal (0) */
164         writel(reg, &pmt->pmt_tri_a);
165 #endif  /* CONFIG_TEGRA2_ENABLE_UARTA */
166 #if defined(CONFIG_TEGRA2_ENABLE_UARTD)
167         reg = readl(&pmt->pmt_ctl_b);
168         reg &= 0xFFFFFFF3;      /* GMC_SEL [3:2] = 00, UARTD */
169         writel(reg, &pmt->pmt_ctl_b);
170
171         reg = readl(&pmt->pmt_tri_a);
172         reg &= ~Z_GMC;          /* Z_GMC = normal (0) */
173         writel(reg, &pmt->pmt_tri_a);
174 #endif  /* CONFIG_TEGRA2_ENABLE_UARTD */
175 }
176
177 /*
178  * Routine: clock_init_mmc
179  * Description: init the PLL and clocks for the SDMMC controllers
180  */
181 static void clock_init_mmc(void)
182 {
183         struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
184         u32 reg;
185
186         /* Do the SDMMC resets/clock enables */
187
188         /* Assert Reset to SDMMC4 */
189         reg = readl(&clkrst->crc_rst_dev_l);
190         reg |= SWR_SDMMC4_RST;          /* SWR_SDMMC4_RST = 1 */
191         writel(reg, &clkrst->crc_rst_dev_l);
192
193         /* Enable clk to SDMMC4 */
194         reg = readl(&clkrst->crc_clk_out_enb_l);
195         reg |= CLK_ENB_SDMMC4;          /* CLK_ENB_SDMMC4 = 1 */
196         writel(reg, &clkrst->crc_clk_out_enb_l);
197
198         /* Enable pllp_out0 to SDMMC4 */
199         reg = readl(&clkrst->crc_clk_src_sdmmc4);
200         reg &= 0x3FFFFF00;      /* SDMMC4_CLK_SRC = 00, PLLP_OUT0 */
201         reg |= (10 << 1);       /* n-1, 11-1 shl 1 */
202         writel(reg, &clkrst->crc_clk_src_sdmmc4);
203
204         /*
205          * As per the Tegra2 TRM, section 5.3.4:
206          * 'Wait 2 us for the clock to flush through the pipe/logic'
207          */
208         udelay(2);
209
210         /* De-assert reset to SDMMC4 */
211         reg = readl(&clkrst->crc_rst_dev_l);
212         reg &= ~SWR_SDMMC4_RST;         /* SWR_SDMMC4_RST = 0 */
213         writel(reg, &clkrst->crc_rst_dev_l);
214
215         /* Assert Reset to SDMMC3 */
216         reg = readl(&clkrst->crc_rst_dev_u);
217         reg |= SWR_SDMMC3_RST;          /* SWR_SDMMC3_RST = 1 */
218         writel(reg, &clkrst->crc_rst_dev_u);
219
220         /* Enable clk to SDMMC3 */
221         reg = readl(&clkrst->crc_clk_out_enb_u);
222         reg |= CLK_ENB_SDMMC3;          /* CLK_ENB_SDMMC3 = 1 */
223         writel(reg, &clkrst->crc_clk_out_enb_u);
224
225         /* Enable pllp_out0 to SDMMC4, set divisor to 11 for 20MHz */
226         reg = readl(&clkrst->crc_clk_src_sdmmc3);
227         reg &= 0x3FFFFF00;      /* SDMMC3_CLK_SRC = 00, PLLP_OUT0 */
228         reg |= (10 << 1);       /* n-1, 11-1 shl 1 */
229         writel(reg, &clkrst->crc_clk_src_sdmmc3);
230
231         /* wait for 2us */
232         udelay(2);
233
234         /* De-assert reset to SDMMC3 */
235         reg = readl(&clkrst->crc_rst_dev_u);
236         reg &= ~SWR_SDMMC3_RST;         /* SWR_SDMMC3_RST = 0 */
237         writel(reg, &clkrst->crc_rst_dev_u);
238 }
239
240 /*
241  * Routine: pin_mux_mmc
242  * Description: setup the pin muxes/tristate values for the SDMMC(s)
243  */
244 static void pin_mux_mmc(void)
245 {
246         struct pmux_tri_ctlr *pmt = (struct pmux_tri_ctlr *)NV_PA_APB_MISC_BASE;
247         u32 reg;
248
249         /* SDMMC4 */
250         /* config 2, x8 on 2nd set of pins */
251         reg = readl(&pmt->pmt_ctl_a);
252         reg |= (3 << 16);       /* ATB_SEL [17:16] = 11 SDIO4 */
253         writel(reg, &pmt->pmt_ctl_a);
254         reg = readl(&pmt->pmt_ctl_b);
255         reg |= (3 << 0);        /* GMA_SEL [1:0] = 11 SDIO4 */
256         writel(reg, &pmt->pmt_ctl_b);
257         reg = readl(&pmt->pmt_ctl_d);
258         reg |= (3 << 0);        /* GME_SEL [1:0] = 11 SDIO4 */
259         writel(reg, &pmt->pmt_ctl_d);
260
261         reg = readl(&pmt->pmt_tri_a);
262         reg &= ~Z_ATB;          /* Z_ATB = normal (0) */
263         reg &= ~Z_GMA;          /* Z_GMA = normal (0) */
264         writel(reg, &pmt->pmt_tri_a);
265         reg = readl(&pmt->pmt_tri_b);
266         reg &= ~Z_GME;          /* Z_GME = normal (0) */
267         writel(reg, &pmt->pmt_tri_b);
268
269         /* SDMMC3 */
270         /* SDIO3_CLK, SDIO3_CMD, SDIO3_DAT[3:0] */
271         reg = readl(&pmt->pmt_ctl_d);
272         reg &= 0xFFFF03FF;
273         reg |= (2 << 10);       /* SDB_SEL [11:10] = 01 SDIO3 */
274         reg |= (2 << 12);       /* SDC_SEL [13:12] = 01 SDIO3 */
275         reg |= (2 << 14);       /* SDD_SEL [15:14] = 01 SDIO3 */
276         writel(reg, &pmt->pmt_ctl_d);
277
278         reg = readl(&pmt->pmt_tri_b);
279         reg &= ~Z_SDC;          /* Z_SDC = normal (0) */
280         reg &= ~Z_SDD;          /* Z_SDD = normal (0) */
281         writel(reg, &pmt->pmt_tri_b);
282         reg = readl(&pmt->pmt_tri_d);
283         reg &= ~Z_SDB;          /* Z_SDB = normal (0) */
284         writel(reg, &pmt->pmt_tri_d);
285 }
286
287 /*
288  * Routine: clock_init
289  * Description: Do individual peripheral clock reset/enables
290  */
291 void clock_init(void)
292 {
293         clock_init_uart();
294 }
295
296 /*
297  * Routine: pinmux_init
298  * Description: Do individual peripheral pinmux configs
299  */
300 void pinmux_init(void)
301 {
302         pin_mux_uart();
303 }
304
305 /*
306  * Routine: gpio_init
307  * Description: Do individual peripheral GPIO configs
308  */
309 void gpio_init(void)
310 {
311         gpio_config_uart();
312 }
313
314 /*
315  * Routine: board_init
316  * Description: Early hardware init.
317  */
318 int board_init(void)
319 {
320         /* boot param addr */
321         gd->bd->bi_boot_params = (NV_PA_SDRAM_BASE + 0x100);
322         /* board id for Linux */
323         gd->bd->bi_arch_number = CONFIG_MACH_TYPE;
324
325         return 0;
326 }
327
328 #ifdef CONFIG_TEGRA2_MMC
329 /* this is a weak define that we are overriding */
330 int board_mmc_init(bd_t *bd)
331 {
332         debug("board_mmc_init called\n");
333         /* Enable clocks, muxes, etc. for SDMMC controllers */
334         clock_init_mmc();
335         pin_mux_mmc();
336
337         debug("board_mmc_init: init eMMC\n");
338         /* init dev 0, eMMC chip, with 4-bit bus */
339         tegra2_mmc_init(0, 4);
340
341         debug("board_mmc_init: init SD slot\n");
342         /* init dev 1, SD slot, with 4-bit bus */
343         tegra2_mmc_init(1, 4);
344
345         return 0;
346 }
347
348 /* this is a weak define that we are overriding */
349 int board_mmc_getcd(u8 *cd, struct mmc *mmc)
350 {
351         debug("board_mmc_getcd called\n");
352         /*
353          * Hard-code CD presence for now. Need to add GPIO inputs
354          * for Seaboard & Harmony (& Kaen/Aebl/Wario?)
355          */
356         *cd = 1;
357         return 0;
358 }
359 #endif