dm365.c

/*
 * File      : dm365.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author		Notes
 * 2010-11-13     weety		first version
 */

#include <edma.h>

#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))

static rt_uint32_t commonrate;
static rt_uint32_t div_by_four;
static rt_uint32_t div_by_six;
static rt_uint32_t armrate;
static rt_uint32_t fixedrate;
static rt_uint32_t ddrrate;
static rt_uint32_t voicerate;
static rt_uint32_t mmcsdrate;
static rt_uint32_t vpssrate, vencrate_sd, vencrate_hd;


/* Four Transfer Controllers on DM365 */
static const rt_int8_t
dm365_queue_tc_mapping[][2] = {
	/* {event queue no, TC no} */
	{0, 0},
	{1, 1},
	{2, 2},
	{3, 3},
	{-1, -1},
};

static const rt_int8_t
dm365_queue_priority_mapping[][2] = {
	/* {event queue no, Priority} */
	{0, 7},
	{1, 7},
	{2, 7},
	{3, 0},
	{-1, -1},
};

static struct edma_soc_info edma_cc0_info = {
	.n_channel		= 64,
	.n_region		= 4,
	.n_slot			= 256,
	.n_tc			= 4,
	.n_cc			= 1,
	.queue_tc_mapping	= dm365_queue_tc_mapping,
	.queue_priority_mapping	= dm365_queue_priority_mapping,
	.default_queue		= EVENTQ_3,
};

static struct edma_soc_info *dm365_edma_info[EDMA_MAX_CC] = {
	&edma_cc0_info,
};

static rt_list_t clocks;

struct clk {
	char name[32];
	rt_uint32_t *rate_hz;
	struct clk *parent;
	rt_list_t  node;
};

static struct clk davinci_dm365_clks[] = {
	{
		.name = "ARMCLK",
		.rate_hz = &armrate,
	},
	{
		.name = "UART0",
		.rate_hz = &fixedrate,
	},
	{
		.name = "UART1",
		.rate_hz = &commonrate,
	},
	{
		.name = "HPI",
		.rate_hz = &commonrate,
	},
	{
		.name = "EMACCLK",
		.rate_hz = &commonrate,
	},
	{
		.name = "I2CCLK",
		.rate_hz = &fixedrate,
	},
	{
		.name = "McBSPCLK",
		.rate_hz = &commonrate,
	},
	{
		.name = "MMCSDCLK0",
		.rate_hz = &mmcsdrate,
	},
	{
		.name = "MMCSDCLK1",
		.rate_hz = &mmcsdrate,
	},
	{
		.name = "SPICLK",
		.rate_hz = &commonrate,
	},
	{
		.name = "gpio",
		.rate_hz = &commonrate,
	},
	{
		.name = "AEMIFCLK",
		.rate_hz = &commonrate,
	},
	{
		.name = "PWM0_CLK",
		.rate_hz = &fixedrate,
	},
	{
		.name = "PWM1_CLK",
		.rate_hz = &fixedrate,
	},
	{
		.name = "PWM2_CLK",
		.rate_hz = &fixedrate,
	},
	{
		.name = "PWM3_CLK",
		.rate_hz = &fixedrate,
	},
	{
		.name = "USBCLK",
		.rate_hz = &fixedrate,
	},
	{
		.name = "VOICECODEC_CLK",
		.rate_hz = &voicerate,
	},
	{
		.name = "RTC_CLK",
		.rate_hz = &fixedrate,
	},
	{
		.name = "KEYSCAN_CLK",
		.rate_hz = &fixedrate,
	},
	{
		.name = "ADCIF_CLK",
		.rate_hz = &fixedrate,
	},
};

/* clocks cannot be de-registered no refcounting necessary */
struct clk *clk_get(const char *id)
{
	struct clk *clk;
	rt_list_t *list;
	
	for (list = (&clocks)->next; list != &clocks; list = list->next)
	{
		clk = (struct clk *)rt_list_entry(list, struct clk, node);
		if (rt_strcmp(id, clk->name) == 0)
			return clk;
	}

	return RT_NULL;
}

rt_uint32_t clk_get_rate(struct clk *clk)
{
	rt_uint32_t	flags;
	rt_uint32_t	*rate;

	for (;;) {
		rate = clk->rate_hz;
		if (rate || !clk->parent)
			break;
		clk = clk->parent;
	}
	return *rate;
}

void clk_register(struct clk *clk)
{
	rt_list_insert_after(&clocks, &clk->node);
}

int davinci_register_clks(struct clk *clk_list, int num_clks)
{
	struct clk *clkp;
	int i;

	for (i = 0, clkp = clk_list; i < num_clks; i++, clkp++)
	{
		//rt_kprintf("1:%s\n", clkp->name);
		clk_register(clkp);
		//rt_kprintf("2:%s\n", clkp->name);
	}

	return 0;
}

/* PLL/Reset register offsets */
#define PLLM		0x110
#define PREDIV		0x114
#define PLLDIV2		0x11C
#define POSTDIV		0x128
#define PLLDIV4		0x160
#define PLLDIV5		0x164
#define PLLDIV6		0x168
#define PLLDIV7		0x16C
#define PLLDIV8		0x170


int davinci_clk_init(void)
{
	struct clk *clk_list;
	int num_clks;
	rt_uint32_t pll0_mult, pll1_mult;

	unsigned long prediv, postdiv;
	unsigned long pll_rate;
	unsigned long pll_div2, pll_div4, pll_div5,
		pll_div6, pll_div7, pll_div8;

	rt_list_init(&clocks);

	//davinci_psc_register(davinci_psc_base, 1);

	pll0_mult = davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLM);
	pll1_mult = davinci_readl(DAVINCI_PLL_CNTRL1_BASE + PLLM);

	commonrate = ((pll0_mult + 1) * 27000000) / 6;
	armrate = ((pll0_mult + 1) * 27000000) / 2;

	fixedrate = 24000000;

	/* Read PLL0 configuration */
	prediv = (davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PREDIV) &
			0x1f) + 1;
	postdiv = (davinci_readl(DAVINCI_PLL_CNTRL0_BASE + POSTDIV) &
			0x1f) + 1;

	/* PLL0 dividers */
	pll_div4 = (davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLDIV4) &
			0x1f) + 1; /* EDMA, EMAC, config, common */
	pll_div5 = (davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLDIV5) &
			0x1f) + 1; /* VPSS */
	pll_div6 = (davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLDIV6) &
			0x1f) + 1; /* VENC */
	pll_div7 = (davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLDIV7) &
			0x1f) + 1; /* DDR */
	pll_div8 = (davinci_readl(DAVINCI_PLL_CNTRL0_BASE + PLLDIV8) &
			0x1f) + 1; /* MMC/SD */

	pll_rate = ((fixedrate / prediv) * (2 * pll0_mult)) / postdiv;

	commonrate = pll_rate / pll_div4; /* 486/4 = 121.5MHz */
	vpssrate = pll_rate / pll_div5; /* 486/2 = 243MHz */
	vencrate_sd = pll_rate / pll_div6; /* 486/18 =  27MHz */
	ddrrate = pll_rate / pll_div7; /* 486/2 = 243MHz */
	mmcsdrate = pll_rate / pll_div8; /* 486/4 =  121.5MHz */

	rt_kprintf(
		"PLL0: fixedrate: %d, commonrate: %d, vpssrate: %d\n",
		fixedrate, commonrate, vpssrate);
	rt_kprintf(
		"PLL0: vencrate_sd: %d, ddrrate: %d mmcsdrate: %d\n",
		vencrate_sd, (ddrrate/2), mmcsdrate);

	/* Read PLL1 configuration */
	prediv = (davinci_readl(DAVINCI_PLL_CNTRL1_BASE + PREDIV) &
			0x1f) + 1;
	postdiv = (davinci_readl(DAVINCI_PLL_CNTRL1_BASE + POSTDIV) &
			0x1f) + 1;
	pll_rate = ((fixedrate / prediv) * (2 * pll1_mult)) / postdiv;

	/* PLL1 dividers */
	pll_div2 = (davinci_readl(DAVINCI_PLL_CNTRL1_BASE + PLLDIV2) &
			0x1f) + 1; /* ARM */
	pll_div4 = (davinci_readl(DAVINCI_PLL_CNTRL1_BASE + PLLDIV4) &
			0x1f) + 1; /* VOICE */
	pll_div5 = (davinci_readl(DAVINCI_PLL_CNTRL1_BASE + PLLDIV5) &
			0x1f) + 1; /* VENC */

	armrate = pll_rate / pll_div2; /* 594/2 = 297MHz */
	voicerate = pll_rate / pll_div4; /* 594/6 = 99MHz */
	vencrate_hd = pll_rate / pll_div5; /* 594/8 = 74.25MHz */

	rt_kprintf(
		"PLL1: armrate: %d, voicerate: %d, vencrate_hd: %d\n",
		armrate, voicerate, vencrate_hd);

	clk_list = davinci_dm365_clks;
	num_clks = ARRAY_SIZE(davinci_dm365_clks); 

	return davinci_register_clks(clk_list, num_clks);
}

void platform_init(void)
{
	edma_init(dm365_edma_info);
}


/* Reset board using the watchdog timer */
void reset_system(void)
{
	rt_uint32_t tgcr, wdtcr;
	rt_uint32_t base = DAVINCI_WDOG_BASE;

	/* Disable, internal clock source */
	davinci_writel(0, base + TCR);

	/* Reset timer, set mode to 64-bit watchdog, and unreset */
	davinci_writel(0, base + TGCR);
	tgcr =	(TGCR_TIMMODE_64BIT_WDOG << TGCR_TIMMODE_SHIFT) |
		(TGCR_UNRESET << TGCR_TIM12RS_SHIFT) |
		(TGCR_UNRESET << TGCR_TIM34RS_SHIFT);
	davinci_writel(tgcr, base + TGCR);

	/* Clear counter and period regs */
	davinci_writel(0, base + TIM12);
	davinci_writel(0, base + TIM34);
	davinci_writel(0, base + PRD12);
	davinci_writel(0, base + PRD34);

	/* Enable periodic mode */
	davinci_writel(TCR_ENAMODE_PERIODIC << ENAMODE12_SHIFT, base + TCR);

	/* Put watchdog in pre-active state */
	wdtcr = (WDTCR_WDKEY_SEQ0 << WDTCR_WDKEY_SHIFT) |
		(WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT);
	davinci_writel(wdtcr, base + WDTCR);

	/* Put watchdog in active state */
	wdtcr = (WDTCR_WDKEY_SEQ1 << WDTCR_WDKEY_SHIFT) |
		(WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT);
	davinci_writel(wdtcr, base + WDTCR);

	/*
	 * Write an invalid value to the WDKEY field to trigger
	 * a watchdog reset.
	 */
	wdtcr = 0xDEADBEEF;
	davinci_writel(wdtcr, base + WDTCR);
}