[3/5] ARM: socfpga: Add support to gate peripheral clocks

Commit Message

Dinh Nguyen May 14, 2013, 10:52 p.m. UTC

From: Dinh Nguyen <[e-mail]>

Add support to gate the clocks that directly feed peripherals. For clocks
with multiple parents, add the ability to determine the correct parent,
and also set parents. Also add support to calculate and set the clocks'
rate.

Signed-off-by: Dinh Nguyen <[e-mail]>
CC: Mike Turquette <[e-mail]>
CC: Arnd Bergmann <[e-mail]>
CC: Olof Johansson <[e-mail]>
CC: Pavel Machek <[e-mail]>
CC: <[e-mail]>
---
 drivers/clk/socfpga/clk.c |  182 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 180 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/clk/socfpga/clk.c b/drivers/clk/socfpga/clk.c
index bd11315..a0551f2 100644
--- a/drivers/clk/socfpga/clk.c
+++ b/drivers/clk/socfpga/clk.c
@@ -26,6 +26,8 @@ 
 /* Clock Manager offsets */
 #define CLKMGR_CTRL    0x0
 #define CLKMGR_BYPASS 0x4
+#define CLKMGR_L4SRC	0x70
+#define CLKMGR_PERPLL_SRC	0xAC
 
 /* Clock bypass bits */
 #define MAINPLL_BYPASS (1<<0)
@@ -41,6 +43,16 @@ 
 #define SOCFPGA_PLL_DIVF_SHIFT	3
 #define SOCFPGA_PLL_DIVQ_MASK		0x003F0000
 #define SOCFPGA_PLL_DIVQ_SHIFT	16
+#define SOCFGPA_MAX_PARENTS	3
+
+#define SOCFPGA_L4_MP_CLK			"l4_mp_clk"
+#define SOCFPGA_L4_SP_CLK			"l4_sp_clk"
+#define SOCFPGA_NAND_CLK		"nand_clk"
+#define SOCFPGA_NAND_X_CLK		"nand_x_clk"
+#define SOCFPGA_MMC_CLK			"mmc_clk"
+#define SOCFPGA_DB_CLK			"gpio_db_clk"
+
+#define div_mask(width)	((1 << (width)) - 1)
 
 extern void __iomem *clk_mgr_base_addr;
 
@@ -49,6 +61,9 @@  struct socfpga_clk {
 	char *parent_name;
 	char *clk_name;
 	u32 fixed_div;
+	void __iomem *div_reg;
+	u32 width;
+	u32 shift;
 };
 #define to_socfpga_clk(p) container_of(p, struct socfpga_clk, hw.hw)
 
@@ -132,8 +147,9 @@  static __init struct clk *socfpga_clk_init(struct device_node *node,
 
 	socfpga_clk->hw.hw.init = &init;
 
-	if (strcmp(clk_name, "main_pll") || strcmp(clk_name, "periph_pll") ||
-			strcmp(clk_name, "sdram_pll")) {
+	if (strcmp(clk_name, "main_pll") == 0 ||
+			strcmp(clk_name, "periph_pll") == 0 ||
+			strcmp(clk_name, "sdram_pll") == 0) {
 		socfpga_clk->hw.bit_idx = SOCFPGA_PLL_EXT_ENA;
 		clk_pll_ops.enable = clk_gate_ops.enable;
 		clk_pll_ops.disable = clk_gate_ops.disable;
@@ -148,6 +164,162 @@  static __init struct clk *socfpga_clk_init(struct device_node *node,
 	return clk;
 }
 
+static u8 socfpga_clk_get_parent(struct clk_hw *hwclk)
+{
+	u32 l4_src;
+	u32 perpll_src;
+	u8 parent;
+
+	if (strcmp(hwclk->init->name, SOCFPGA_L4_MP_CLK) == 0) {
+		l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
+		l4_src &= 0x1;
+		parent = l4_src;
+	} else if (strcmp(hwclk->init->name, SOCFPGA_L4_SP_CLK) == 0) {
+		l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
+		l4_src = ((l4_src & 0x2) >> 1);
+		parent = l4_src;
+	} else {
+		perpll_src = readl(clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
+		if (strcmp(hwclk->init->name, SOCFPGA_MMC_CLK) == 0)
+			perpll_src &= 0x3;
+		else if (strcmp(hwclk->init->name, SOCFPGA_NAND_CLK) == 0 ||
+			strcmp(hwclk->init->name, SOCFPGA_NAND_X_CLK) == 0)
+			perpll_src = ((perpll_src & 0xC) >> 2);
+		else /*QSPI clock */
+			perpll_src = ((perpll_src & 0x30) >> 4);
+		parent = perpll_src;
+	}
+
+	return parent;
+}
+
+static int socfpga_clk_set_parent(struct clk_hw *hwclk, u8 parent)
+{
+	u32 src_reg;
+
+	if (strcmp(hwclk->init->name, SOCFPGA_L4_MP_CLK) == 0) {
+		src_reg = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
+		src_reg &= ~0x1;
+		src_reg |= parent;
+		writel(src_reg, clk_mgr_base_addr + CLKMGR_L4SRC);
+	} else if (strcmp(hwclk->init->name, SOCFPGA_L4_SP_CLK) == 0) {
+		src_reg = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
+		src_reg &= ~0x2;
+		src_reg |= (parent << 1);
+		writel(src_reg, clk_mgr_base_addr + CLKMGR_L4SRC);
+	} else {
+		src_reg = readl(clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
+		if (strcmp(hwclk->init->name, SOCFPGA_MMC_CLK) == 0) {
+			src_reg &= ~0x3;
+			src_reg |= parent;
+		} else if (strcmp(hwclk->init->name, SOCFPGA_NAND_CLK) == 0 ||
+			strcmp(hwclk->init->name, SOCFPGA_NAND_X_CLK) == 0) {
+			src_reg &= ~0xC;
+			src_reg |= (parent << 2);
+		} else {/*QSPI clock */
+			src_reg &= ~0x30;
+			src_reg |= (parent << 4);
+		}
+		writel(src_reg, clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
+	}
+
+	return 0;
+}
+
+static unsigned long socfpga_clk_recalc_rate(struct clk_hw *hwclk,
+	unsigned long parent_rate)
+{
+	struct socfpga_clk *socfpgaclk = to_socfpga_clk(hwclk);
+	u32 div = 1, val;
+
+	if (socfpgaclk->fixed_div)
+		div = socfpgaclk->fixed_div;
+	else if (socfpgaclk->div_reg) {
+		val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
+		val &= div_mask(socfpgaclk->width);
+		if (strcmp(hwclk->init->name, SOCFPGA_DB_CLK) == 0)
+			div = val + 1;
+		else
+			div = (1 << val);
+	}
+
+	return parent_rate / div;
+}
+
+static struct clk_ops gateclk_ops = {
+	.recalc_rate = socfpga_clk_recalc_rate,
+	.get_parent = socfpga_clk_get_parent,
+	.set_parent = socfpga_clk_set_parent,
+};
+
+static void __init socfpga_gate_clk_init(struct device_node *node,
+	const struct clk_ops *ops)
+{
+	u32 clk_gate[2];
+	u32 div_reg[3];
+	u32 fixed_div;
+	struct clk *clk;
+	struct socfpga_clk *socfpga_clk;
+	const char *clk_name = node->name;
+	const char *parent_name[SOCFGPA_MAX_PARENTS];
+	struct clk_init_data init;
+	int rc;
+	int i = 0;
+
+	socfpga_clk = kzalloc(sizeof(*socfpga_clk), GFP_KERNEL);
+	if (WARN_ON(!socfpga_clk))
+		return;
+
+	rc = of_property_read_u32_array(node, "clk-gate", clk_gate, 2);
+	if (rc)
+		clk_gate[0] = 0;
+
+	rc = of_property_read_u32(node, "fixed-divider", &fixed_div);
+	if (rc)
+		socfpga_clk->fixed_div = 0;
+	else
+		socfpga_clk->fixed_div = fixed_div;
+
+	if (clk_gate[0]) {
+		socfpga_clk->hw.reg = clk_mgr_base_addr + clk_gate[0];
+		socfpga_clk->hw.bit_idx = clk_gate[1];
+
+		gateclk_ops.enable = clk_gate_ops.enable;
+		gateclk_ops.disable = clk_gate_ops.disable;
+	}
+
+	rc = of_property_read_u32_array(node, "div-reg", div_reg, 3);
+	if (!rc) {
+		socfpga_clk->div_reg = clk_mgr_base_addr + div_reg[0];
+		socfpga_clk->shift = div_reg[1];
+		socfpga_clk->width = div_reg[2];
+	} else {
+		socfpga_clk->div_reg = 0;
+	}
+
+	of_property_read_string(node, "clock-output-names", &clk_name);
+
+	init.name = clk_name;
+	init.ops = ops;
+	init.flags = 0;
+	while (i < SOCFGPA_MAX_PARENTS && (parent_name[i] =
+			of_clk_get_parent_name(node, i)) != NULL)
+		i++;
+
+	init.parent_names = parent_name;
+	init.num_parents = i;
+	socfpga_clk->hw.hw.init = &init;
+
+	clk = clk_register(NULL, &socfpga_clk->hw.hw);
+	if (WARN_ON(IS_ERR(clk))) {
+		kfree(socfpga_clk);
+		return;
+	}
+	rc = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (WARN_ON(rc))
+		return;
+}
+
 static void __init socfpga_pll_init(struct device_node *node)
 {
 	socfpga_clk_init(node, &clk_pll_ops);
@@ -160,6 +332,12 @@  static void __init socfpga_periph_init(struct device_node *node)
 }
 CLK_OF_DECLARE(socfpga_periph, "altr,socfpga-perip-clk", socfpga_periph_init);
 
+static void __init socfpga_gate_init(struct device_node *node)
+{
+	socfpga_gate_clk_init(node, &gateclk_ops);
+}
+CLK_OF_DECLARE(socfpga_gate, "altr,socfpga-gate-clk", socfpga_gate_init);
+
 void __init socfpga_init_clocks(void)
 {
 	struct clk *clk;