[PATCHv3 3/6] ARM: socfpga: Add support to gate peripheral clocks
dinguyen at altera.com
dinguyen at altera.com
Thu May 23 17:36:39 EDT 2013
From: Dinh Nguyen <dinguyen at altera.com>
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 <dinguyen at altera.com>
Reviewed-by: Pavel Machek <pavel at denx.de>
CC: Mike Turquette <mturquette at linaro.org>
CC: Arnd Bergmann <arnd at arndb.de>
CC: Olof Johansson <olof at lixom.net>
Cc: Pavel Machek <pavel at denx.de>
CC: <linux at arm.linux.org.uk>
v3:
- Addressed comments from Pavel
v2:
- Fix space/indent errors
- Add streq for strcmp == 0
---
drivers/clk/socfpga/clk.c | 194 ++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 185 insertions(+), 9 deletions(-)
diff --git a/drivers/clk/socfpga/clk.c b/drivers/clk/socfpga/clk.c
index bd11315..5bb848c 100644
--- a/drivers/clk/socfpga/clk.c
+++ b/drivers/clk/socfpga/clk.c
@@ -24,15 +24,17 @@
#include <linux/of.h>
/* Clock Manager offsets */
-#define CLKMGR_CTRL 0x0
-#define CLKMGR_BYPASS 0x4
+#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)
-#define SDRAMPLL_BYPASS (1<<1)
-#define SDRAMPLL_SRC_BYPASS (1<<2)
-#define PERPLL_BYPASS (1<<3)
-#define PERPLL_SRC_BYPASS (1<<4)
+#define MAINPLL_BYPASS (1<<0)
+#define SDRAMPLL_BYPASS (1<<1)
+#define SDRAMPLL_SRC_BYPASS (1<<2)
+#define PERPLL_BYPASS (1<<3)
+#define PERPLL_SRC_BYPASS (1<<4)
#define SOCFPGA_PLL_BG_PWRDWN 0
#define SOCFPGA_PLL_EXT_ENA 1
@@ -41,6 +43,17 @@
#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)
+#define streq(a, b) (strcmp((a), (b)) == 0)
extern void __iomem *clk_mgr_base_addr;
@@ -49,6 +62,9 @@ struct socfpga_clk {
char *parent_name;
char *clk_name;
u32 fixed_div;
+ void __iomem *div_reg;
+ u32 width; /* only valid if div_reg != 0 */
+ u32 shift; /* only valid if div_reg != 0 */
};
#define to_socfpga_clk(p) container_of(p, struct socfpga_clk, hw.hw)
@@ -132,8 +148,9 @@ 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 (streq(clk_name, "main_pll") ||
+ streq(clk_name, "periph_pll") ||
+ streq(clk_name, "sdram_pll")) {
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 +165,159 @@ 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;
+
+ if (streq(hwclk->init->name, SOCFPGA_L4_MP_CLK)) {
+ l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
+ return l4_src &= 0x1;
+ }
+ if (streq(hwclk->init->name, SOCFPGA_L4_SP_CLK)) {
+ l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
+ return !!(l4_src & 2);
+ }
+
+ perpll_src = readl(clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
+ if (streq(hwclk->init->name, SOCFPGA_MMC_CLK))
+ return perpll_src &= 0x3;
+ if (streq(hwclk->init->name, SOCFPGA_NAND_CLK) ||
+ streq(hwclk->init->name, SOCFPGA_NAND_X_CLK))
+ return (perpll_src >> 2) & 3;
+
+ /* QSPI clock */
+ return (perpll_src >> 4) & 3;
+
+}
+
+static int socfpga_clk_set_parent(struct clk_hw *hwclk, u8 parent)
+{
+ u32 src_reg;
+
+ if (streq(hwclk->init->name, SOCFPGA_L4_MP_CLK)) {
+ 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 (streq(hwclk->init->name, SOCFPGA_L4_SP_CLK)) {
+ 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 (streq(hwclk->init->name, SOCFPGA_MMC_CLK)) {
+ src_reg &= ~0x3;
+ src_reg |= parent;
+ } else if (streq(hwclk->init->name, SOCFPGA_NAND_CLK) ||
+ streq(hwclk->init->name, SOCFPGA_NAND_X_CLK)) {
+ 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 (streq(hwclk->init->name, SOCFPGA_DB_CLK))
+ 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;
+
+ 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(node, "fixed-divider", &fixed_div);
+ if (rc)
+ socfpga_clk->fixed_div = 0;
+ else
+ socfpga_clk->fixed_div = fixed_div;
+
+ 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 +330,12 @@ 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;
--
1.7.9.5
More information about the linux-arm-kernel
mailing list