1 files changed, 451 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm1176/tnetv107x/clock.c b/arch/arm/cpu/arm1176/tnetv107x/clock.c
new file mode 100644
index 0000000..e26fec1
--- /dev/null
+++ b/arch/arm/cpu/arm1176/tnetv107x/clock.c
@@ -0,0 +1,451 @@
+/*
+ * TNETV107X: Clock management APIs
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <common.h>
+#include <asm-generic/errno.h>
+#include <asm/io.h>
+#include <asm/processor.h>
+#include <asm/arch/clock.h>
+
+#define CLOCK_BASE		TNETV107X_CLOCK_CONTROL_BASE
+#define PSC_BASE		TNETV107X_PSC_BASE
+
+#define BIT(x)			(1 << (x))
+
+#define MAX_PREDIV		64
+#define MAX_POSTDIV		8
+#define MAX_MULT		512
+#define MAX_DIV			(MAX_PREDIV * MAX_POSTDIV)
+
+/* LPSC registers */
+#define PSC_PTCMD		0x120
+#define PSC_PTSTAT		0x128
+#define PSC_MDSTAT(n)		(0x800 + (n) * 4)
+#define PSC_MDCTL(n)		(0xA00 + (n) * 4)
+
+#define PSC_MDCTL_LRSTZ		BIT(8)
+
+#define psc_reg_read(reg)	__raw_readl((u32 *)(PSC_BASE + (reg)))
+#define psc_reg_write(reg, val)	__raw_writel(val, (u32 *)(PSC_BASE + (reg)))
+
+/* SSPLL registers */
+struct sspll_regs {
+	u32	modes;
+	u32	postdiv;
+	u32	prediv;
+	u32	mult_factor;
+	u32	divider_range;
+	u32	bw_divider;
+	u32	spr_amount;
+	u32	spr_rate_div;
+	u32	diag;
+};
+
+/* SSPLL base addresses */
+static struct sspll_regs *sspll_regs[] = {
+	(struct sspll_regs *)(CLOCK_BASE + 0x040),
+	(struct sspll_regs *)(CLOCK_BASE + 0x080),
+	(struct sspll_regs *)(CLOCK_BASE + 0x0c0),
+};
+
+#define sspll_reg(pll, reg)		(&(sspll_regs[pll]->reg))
+#define sspll_reg_read(pll, reg)	__raw_readl(sspll_reg(pll, reg))
+#define sspll_reg_write(pll, reg, val)	__raw_writel(val, sspll_reg(pll, reg))
+
+
+/* PLL Control Registers */
+struct pllctl_regs {
+	u32	ctl;		/* 00 */
+	u32	ocsel;		/* 04 */
+	u32	secctl;		/* 08 */
+	u32	__pad0;
+	u32	mult;		/* 10 */
+	u32	prediv;		/* 14 */
+	u32	div1;		/* 18 */
+	u32	div2;		/* 1c */
+	u32	div3;		/* 20 */
+	u32	oscdiv1;	/* 24 */
+	u32	postdiv;	/* 28 */
+	u32	bpdiv;		/* 2c */
+	u32	wakeup;		/* 30 */
+	u32	__pad1;
+	u32	cmd;		/* 38 */
+	u32	stat;		/* 3c */
+	u32	alnctl;		/* 40 */
+	u32	dchange;	/* 44 */
+	u32	cken;		/* 48 */
+	u32	ckstat;		/* 4c */
+	u32	systat;		/* 50 */
+	u32	ckctl;		/* 54 */
+	u32	__pad2[2];
+	u32	div4;		/* 60 */
+	u32	div5;		/* 64 */
+	u32	div6;		/* 68 */
+	u32	div7;		/* 6c */
+	u32	div8;		/* 70 */
+};
+
+struct lpsc_map {
+	int	pll, div;
+};
+
+static struct pllctl_regs *pllctl_regs[] = {
+	(struct pllctl_regs *)(CLOCK_BASE + 0x700),
+	(struct pllctl_regs *)(CLOCK_BASE + 0x300),
+	(struct pllctl_regs *)(CLOCK_BASE + 0x500),
+};
+
+#define pllctl_reg(pll, reg)		(&(pllctl_regs[pll]->reg))
+#define pllctl_reg_read(pll, reg)	__raw_readl(pllctl_reg(pll, reg))
+#define pllctl_reg_write(pll, reg, val)	__raw_writel(val, pllctl_reg(pll, reg))
+
+#define pllctl_reg_rmw(pll, reg, mask, val)			\
+	pllctl_reg_write(pll, reg,				\
+		(pllctl_reg_read(pll, reg) & ~(mask)) | val)
+
+#define pllctl_reg_setbits(pll, reg, mask)			\
+	pllctl_reg_rmw(pll, reg, 0, mask)
+
+#define pllctl_reg_clrbits(pll, reg, mask)			\
+	pllctl_reg_rmw(pll, reg, mask, 0)
+
+/* PLLCTL Bits */
+#define PLLCTL_CLKMODE		BIT(8)
+#define PLLCTL_PLLSELB		BIT(7)
+#define PLLCTL_PLLENSRC		BIT(5)
+#define PLLCTL_PLLDIS		BIT(4)
+#define PLLCTL_PLLRST		BIT(3)
+#define PLLCTL_PLLPWRDN		BIT(1)
+#define PLLCTL_PLLEN		BIT(0)
+
+#define PLLDIV_ENABLE		BIT(15)
+
+static int pll_div_offset[] = {
+#define div_offset(reg)	offsetof(struct pllctl_regs, reg)
+	div_offset(div1), div_offset(div2), div_offset(div3),
+	div_offset(div4), div_offset(div5), div_offset(div6),
+	div_offset(div7), div_offset(div8),
+};
+
+static unsigned long pll_bypass_mask[] = { 1, 4, 2 };
+static unsigned long pll_div_mask[] = { 0x01ff, 0x00ff, 0x00ff };
+
+/* Mappings from PLL+DIV to subsystem clocks */
+#define sys_arm1176_clk		{SYS_PLL, 0}
+#define sys_dsp_clk		{SYS_PLL, 1}
+#define sys_ddr_clk		{SYS_PLL, 2}
+#define sys_full_clk		{SYS_PLL, 3}
+#define sys_lcd_clk		{SYS_PLL, 4}
+#define sys_vlynq_ref_clk	{SYS_PLL, 5}
+#define sys_tsc_clk		{SYS_PLL, 6}
+#define sys_half_clk		{SYS_PLL, 7}
+
+#define eth_clk_5		{ETH_PLL, 0}
+#define eth_clk_50		{ETH_PLL, 1}
+#define eth_clk_125		{ETH_PLL, 2}
+#define eth_clk_250		{ETH_PLL, 3}
+#define eth_clk_25		{ETH_PLL, 4}
+
+#define tdm_clk			{TDM_PLL, 0}
+#define tdm_extra_clk		{TDM_PLL, 1}
+#define tdm1_clk		{TDM_PLL, 2}
+
+/* Optimization barrier */
+#define barrier()	\
+	__asm__ __volatile__("mov r0, r0\n" : : : "memory");
+
+static const struct lpsc_map lpsc_clk_map[] = {
+	[TNETV107X_LPSC_ARM]			= sys_arm1176_clk,
+	[TNETV107X_LPSC_GEM]			= sys_dsp_clk,
+	[TNETV107X_LPSC_DDR2_PHY]		= sys_ddr_clk,
+	[TNETV107X_LPSC_TPCC]			= sys_full_clk,
+	[TNETV107X_LPSC_TPTC0]			= sys_full_clk,
+	[TNETV107X_LPSC_TPTC1]			= sys_full_clk,
+	[TNETV107X_LPSC_RAM]			= sys_full_clk,
+	[TNETV107X_LPSC_MBX_LITE]		= sys_arm1176_clk,
+	[TNETV107X_LPSC_LCD]			= sys_lcd_clk,
+	[TNETV107X_LPSC_ETHSS]			= eth_clk_125,
+	[TNETV107X_LPSC_AEMIF]			= sys_full_clk,
+	[TNETV107X_LPSC_CHIP_CFG]		= sys_half_clk,
+	[TNETV107X_LPSC_TSC]			= sys_tsc_clk,
+	[TNETV107X_LPSC_ROM]			= sys_half_clk,
+	[TNETV107X_LPSC_UART2]			= sys_half_clk,
+	[TNETV107X_LPSC_PKTSEC]			= sys_half_clk,
+	[TNETV107X_LPSC_SECCTL]			= sys_half_clk,
+	[TNETV107X_LPSC_KEYMGR]			= sys_half_clk,
+	[TNETV107X_LPSC_KEYPAD]			= sys_half_clk,
+	[TNETV107X_LPSC_GPIO]			= sys_half_clk,
+	[TNETV107X_LPSC_MDIO]			= sys_half_clk,
+	[TNETV107X_LPSC_SDIO0]			= sys_half_clk,
+	[TNETV107X_LPSC_UART0]			= sys_half_clk,
+	[TNETV107X_LPSC_UART1]			= sys_half_clk,
+	[TNETV107X_LPSC_TIMER0]			= sys_half_clk,
+	[TNETV107X_LPSC_TIMER1]			= sys_half_clk,
+	[TNETV107X_LPSC_WDT_ARM]		= sys_half_clk,
+	[TNETV107X_LPSC_WDT_DSP]		= sys_half_clk,
+	[TNETV107X_LPSC_SSP]			= sys_half_clk,
+	[TNETV107X_LPSC_TDM0]			= tdm_clk,
+	[TNETV107X_LPSC_VLYNQ]			= sys_vlynq_ref_clk,
+	[TNETV107X_LPSC_MCDMA]			= sys_half_clk,
+	[TNETV107X_LPSC_USB0]			= sys_half_clk,
+	[TNETV107X_LPSC_TDM1]			= tdm1_clk,
+	[TNETV107X_LPSC_DEBUGSS]		= sys_half_clk,
+	[TNETV107X_LPSC_ETHSS_RGMII]		= eth_clk_250,
+	[TNETV107X_LPSC_SYSTEM]			= sys_half_clk,
+	[TNETV107X_LPSC_IMCOP]			= sys_dsp_clk,
+	[TNETV107X_LPSC_SPARE]			= sys_half_clk,
+	[TNETV107X_LPSC_SDIO1]			= sys_half_clk,
+	[TNETV107X_LPSC_USB1]			= sys_half_clk,
+	[TNETV107X_LPSC_USBSS]			= sys_half_clk,
+	[TNETV107X_LPSC_DDR2_EMIF1_VRST]	= sys_ddr_clk,
+	[TNETV107X_LPSC_DDR2_EMIF2_VCTL_RST]	= sys_ddr_clk,
+};
+
+static const unsigned long pll_ext_freq[] = {
+	[SYS_PLL] = CONFIG_PLL_SYS_EXT_FREQ,
+	[ETH_PLL] = CONFIG_PLL_ETH_EXT_FREQ,
+	[TDM_PLL] = CONFIG_PLL_TDM_EXT_FREQ,
+};
+
+static unsigned long pll_freq_get(int pll)
+{
+	unsigned long mult = 1, prediv = 1, postdiv = 1;
+	unsigned long ref = CONFIG_SYS_INT_OSC_FREQ;
+	unsigned long ret;
+	u32 bypass;
+
+	bypass = __raw_readl((u32 *)(CLOCK_BASE));
+	if (!(bypass & pll_bypass_mask[pll])) {
+		mult	= sspll_reg_read(pll, mult_factor);
+		prediv	= sspll_reg_read(pll, prediv) + 1;
+		postdiv	= sspll_reg_read(pll, postdiv) + 1;
+	}
+
+	if (pllctl_reg_read(pll, ctl) & PLLCTL_CLKMODE)
+		ref = pll_ext_freq[pll];
+
+	if (!(pllctl_reg_read(pll, ctl) & PLLCTL_PLLEN))
+		return ref;
+
+	ret = (unsigned long)(ref + ((unsigned long long)ref * mult) / 256);
+	ret /= (prediv * postdiv);
+
+	return ret;
+}
+
+static unsigned long __pll_div_freq_get(int pll, unsigned int fpll,
+					int div)
+{
+	int divider = 1;
+	unsigned long divreg;
+
+	divreg = __raw_readl((void *)pllctl_regs[pll] + pll_div_offset[div]);
+
+	if (divreg & PLLDIV_ENABLE)
+		divider = (divreg & pll_div_mask[pll]) + 1;
+
+	return fpll / divider;
+}
+
+static unsigned long pll_div_freq_get(int pll, int div)
+{
+	unsigned int fpll = pll_freq_get(pll);
+
+	return __pll_div_freq_get(pll, fpll, div);
+}
+
+static void __pll_div_freq_set(int pll, unsigned int fpll, int div,
+			       unsigned long hz)
+{
+	int divider = (fpll / hz - 1);
+
+	divider &= pll_div_mask[pll];
+	divider |= PLLDIV_ENABLE;
+
+	__raw_writel(divider, (void *)pllctl_regs[pll] + pll_div_offset[div]);
+	pllctl_reg_setbits(pll, alnctl, (1 << div));
+	pllctl_reg_setbits(pll, dchange, (1 << div));
+}
+
+static unsigned long pll_div_freq_set(int pll, int div, unsigned long hz)
+{
+	unsigned int fpll = pll_freq_get(pll);
+
+	__pll_div_freq_set(pll, fpll, div, hz);
+
+	pllctl_reg_write(pll, cmd, 1);
+
+	/* Wait until new divider takes effect */
+	while (pllctl_reg_read(pll, stat) & 0x01);
+
+	return __pll_div_freq_get(pll, fpll, div);
+}
+
+unsigned long clk_get_rate(unsigned int clk)
+{
+	return pll_div_freq_get(lpsc_clk_map[clk].pll, lpsc_clk_map[clk].div);
+}
+
+unsigned long clk_round_rate(unsigned int clk, unsigned long hz)
+{
+	unsigned long fpll, divider, pll;
+
+	pll = lpsc_clk_map[clk].pll;
+	fpll = pll_freq_get(pll);
+	divider = (fpll / hz - 1);
+	divider &= pll_div_mask[pll];
+
+	return fpll / (divider + 1);
+}
+
+int clk_set_rate(unsigned int clk, unsigned long _hz)
+{
+	unsigned long hz;
+
+	hz = clk_round_rate(clk, _hz);
+	if (hz != _hz)
+		return -EINVAL;	/* Cannot set to target freq */
+
+	pll_div_freq_set(lpsc_clk_map[clk].pll, lpsc_clk_map[clk].div, hz);
+	return 0;
+}
+
+void lpsc_control(int mod, unsigned long state, int lrstz)
+{
+	u32 mdctl;
+
+	mdctl = psc_reg_read(PSC_MDCTL(mod));
+	mdctl &= ~0x1f;
+	mdctl |= state;
+
+	if (lrstz == 0)
+		mdctl &= ~PSC_MDCTL_LRSTZ;
+	else if (lrstz == 1)
+		mdctl |= PSC_MDCTL_LRSTZ;
+
+	psc_reg_write(PSC_MDCTL(mod), mdctl);
+
+	psc_reg_write(PSC_PTCMD, 1);
+
+	/* wait for power domain transition to end */
+	while (psc_reg_read(PSC_PTSTAT) & 1);
+
+	/* Wait for module state change */
+	while ((psc_reg_read(PSC_MDSTAT(mod)) & 0x1f) != state);
+}
+
+int lpsc_status(unsigned int id)
+{
+	return psc_reg_read(PSC_MDSTAT(id)) & 0x1f;
+}
+
+static void init_pll(const struct pll_init_data *data)
+{
+	unsigned long fpll;
+	unsigned long best_pre = 0, best_post = 0, best_mult = 0;
+	unsigned long div, prediv, postdiv, mult;
+	unsigned long delta, actual;
+	long best_delta = -1;
+	int i;
+	u32 tmp;
+
+	if (data->pll == SYS_PLL)
+		return; /* cannot reconfigure system pll on the fly */
+
+	tmp = pllctl_reg_read(data->pll, ctl);
+	if (data->internal_osc) {
+		tmp &= ~PLLCTL_CLKMODE;
+		fpll = CONFIG_SYS_INT_OSC_FREQ;
+	} else {
+		tmp |= PLLCTL_CLKMODE;
+		fpll = pll_ext_freq[data->pll];
+	}
+	pllctl_reg_write(data->pll, ctl, tmp);
+
+	mult = data->pll_freq / fpll;
+	for (mult = MAX(mult, 1); mult <= MAX_MULT; mult++) {
+		div = (fpll * mult) / data->pll_freq;
+		if (div < 1 || div > MAX_DIV)
+			continue;
+
+		for (postdiv = 1; postdiv <= min(div, MAX_POSTDIV); postdiv++) {
+			prediv = div / postdiv;
+			if (prediv < 1 || prediv > MAX_PREDIV)
+				continue;
+
+			actual = (fpll / prediv) * (mult / postdiv);
+			delta = (actual - data->pll_freq);
+			if (delta < 0)
+				delta = -delta;
+			if ((delta < best_delta) || (best_delta == -1)) {
+				best_delta = delta;
+				best_mult = mult;
+				best_pre = prediv;
+				best_post = postdiv;
+				if (delta == 0)
+					goto done;
+			}
+		}
+	}
+done:
+
+	if (best_delta == -1) {
+		printf("pll cannot derive %lu from %lu\n",
+				data->pll_freq, fpll);
+		return;
+	}
+
+	fpll = fpll * best_mult;
+	fpll /= best_pre * best_post;
+
+	pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLENSRC);
+	pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLEN);
+
+	pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLRST);
+
+	pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLPWRDN);
+	pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLDIS);
+
+	sspll_reg_write(data->pll, mult_factor,	(best_mult - 1) << 8);
+	sspll_reg_write(data->pll, prediv,	best_pre - 1);
+	sspll_reg_write(data->pll, postdiv,	best_post - 1);
+
+	for (i = 0; i < 10; i++)
+		if (data->div_freq[i])
+			__pll_div_freq_set(data->pll, fpll, i,
+					   data->div_freq[i]);
+
+	pllctl_reg_write(data->pll, cmd, 1);
+
+	/* Wait until pll "go" operation completes */
+	while (pllctl_reg_read(data->pll, stat) & 0x01);
+
+	pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLRST);
+	pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLEN);
+}
+
+void init_plls(int num_pll, struct pll_init_data *config)
+{
+	int i;
+
+	for (i = 0; i < num_pll; i++)
+		init_pll(&config[i]);
+}