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>

1 files changed, 98 insertions, 0 deletions

diff --git a/arch/arm/mach-mx5/clock-mx51.c b/arch/arm/mach-mx5/clock-mx51.c
index 68aef2d58484..0cef8c4f84ba 100644
--- a/arch/arm/mach-mx5/clock-mx51.c
+++ b/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)