ARM: mx5: Add Nand clock support

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx5/clock-mx51.c

@@ -573,6 +573,64 @@ static int _clk_uart_set_parent(struct clk *clk, struct clk *parent)
 	return 0;
 }
 
+#define clk_nfc_set_parent	NULL
+
+static unsigned long clk_nfc_get_rate(struct clk *clk)
+{
+	unsigned long rate;
+	u32 reg, div;
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	div = ((reg & MXC_CCM_CBCDR_NFC_PODF_MASK) >>
+	       MXC_CCM_CBCDR_NFC_PODF_OFFSET) + 1;
+	rate = clk_get_rate(clk->parent) / div;
+	WARN_ON(rate == 0);
+	return rate;
+}
+
+static unsigned long clk_nfc_round_rate(struct clk *clk,
+						unsigned long rate)
+{
+	u32 div;
+	unsigned long parent_rate = clk_get_rate(clk->parent);
+
+	if (!rate)
+		return -EINVAL;
+
+	div = parent_rate / rate;
+
+	if (parent_rate % rate)
+		div++;
+
+	if (div > 8)
+		return -EINVAL;
+
+	return parent_rate / div;
+
+}
+
+static int clk_nfc_set_rate(struct clk *clk, unsigned long rate)
+{
+	u32 reg, div;
+
+	div = clk_get_rate(clk->parent) / rate;
+	if (div == 0)
+		div++;
+	if (((clk_get_rate(clk->parent) / div) != rate) || (div > 8))
+		return -EINVAL;
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	reg &= ~MXC_CCM_CBCDR_NFC_PODF_MASK;
+	reg |= (div - 1) << MXC_CCM_CBCDR_NFC_PODF_OFFSET;
+	__raw_writel(reg, MXC_CCM_CBCDR);
+
+	while (__raw_readl(MXC_CCM_CDHIPR) &
+			MXC_CCM_CDHIPR_NFC_IPG_INT_MEM_PODF_BUSY){
+	}
+
+	return 0;
+}
+
 static unsigned long clk_usboh3_get_rate(struct clk *clk)
 {
 	u32 reg, prediv, podf;
@@ -622,6 +680,17 @@ static unsigned long get_ckih2_reference_clock_rate(struct clk *clk)
 	return ckih2_reference;
 }
 
+static unsigned long clk_emi_slow_get_rate(struct clk *clk)
+{
+	u32 reg, div;
+
+	reg = __raw_readl(MXC_CCM_CBCDR);
+	div = ((reg & MXC_CCM_CBCDR_EMI_PODF_MASK) >>
+	       MXC_CCM_CBCDR_EMI_PODF_OFFSET) + 1;
+
+	return clk_get_rate(clk->parent) / div;
+}
+
 /* External high frequency clock */
 static struct clk ckih_clk = {
 	.get_rate = get_high_reference_clock_rate,
@@ -764,6 +833,30 @@ static struct clk kpp_clk = {
 	.id = 0,
 };
 
+static struct clk emi_slow_clk = {
+	.parent = &pll2_sw_clk,
+	.enable_reg = MXC_CCM_CCGR5,
+	.enable_shift = MXC_CCM_CCGRx_CG8_OFFSET,
+	.enable = _clk_ccgr_enable,
+	.disable = _clk_ccgr_disable_inwait,
+	.get_rate = clk_emi_slow_get_rate,
+};
+
+#define DEFINE_CLOCK1(name, i, er, es, pfx, p, s)	\
+	static struct clk name = {			\
+		.id		= i,			\
+		.enable_reg	= er,			\
+		.enable_shift	= es,			\
+		.get_rate	= pfx##_get_rate,	\
+		.set_rate	= pfx##_set_rate,	\
+		.round_rate	= pfx##_round_rate,	\
+		.set_parent	= pfx##_set_parent,	\
+		.enable		= _clk_ccgr_enable,	\
+		.disable	= _clk_ccgr_disable,	\
+		.parent		= p,			\
+		.secondary	= s,			\
+	}
+
 /* eCSPI */
 static unsigned long clk_ecspi_get_rate(struct clk *clk)
 {
@@ -852,6 +945,10 @@ DEFINE_CLOCK(hsi2c_clk, 0, MXC_CCM_CCGR1, MXC_CCM_CCGRx_CG11_OFFSET,
 DEFINE_CLOCK(fec_clk, 0, MXC_CCM_CCGR2, MXC_CCM_CCGRx_CG12_OFFSET,
 	NULL,  NULL, &ipg_clk, NULL);
 
+/* NFC */
+DEFINE_CLOCK1(nfc_clk, 0, MXC_CCM_CCGR5, MXC_CCM_CCGRx_CG10_OFFSET,
+	clk_nfc, &emi_slow_clk, NULL);
+
 /* eCSPI */
 DEFINE_CLOCK_FULL(ecspi1_ipg_clk, 0, MXC_CCM_CCGR4, MXC_CCM_CCGRx_CG9_OFFSET,
 		NULL, NULL, _clk_ccgr_enable_inrun, _clk_ccgr_disable,
@@ -893,6 +990,7 @@ static struct clk_lookup lookups[] = {
 	_REGISTER_CLOCK("fsl-usb2-udc", "usb", usboh3_clk)
 	_REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", ahb_clk)
 	_REGISTER_CLOCK("imx-keypad.0", NULL, kpp_clk)
+	_REGISTER_CLOCK("mxc_nand", NULL, nfc_clk)
 	_REGISTER_CLOCK("imx51-ecspi.0", NULL, ecspi1_clk)
 	_REGISTER_CLOCK("imx51-ecspi.1", NULL, ecspi2_clk)
 	_REGISTER_CLOCK("imx51-cspi.0", NULL, cspi_clk)