Add "jz4780_core1_enable()" for enable the second core of JZ4780,
prepare for later commits.
Tested-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
Tested-by: Paul Boddie <paul@xxxxxxxxxxxxx>
Signed-off-by: 周琰杰 (Zhou Yanjie) <zhouyanjie@xxxxxxxxxxxxxx>
Reviewed-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
---
Notes:
v5:
New patch, split from [1/6] in v4.
v5->v6:
simplify code with "readl_poll_timeout()".
drivers/clk/ingenic/jz4780-cgu.c | 55 ++++++++++++++++++++++++++++++++++++----
1 file changed, 50 insertions(+), 5 deletions(-)
diff --git a/drivers/clk/ingenic/jz4780-cgu.c b/drivers/clk/ingenic/jz4780-cgu.c
index d07fff1..92102d8 100644
--- a/drivers/clk/ingenic/jz4780-cgu.c
+++ b/drivers/clk/ingenic/jz4780-cgu.c
@@ -9,14 +9,16 @@
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/io.h>
+#include <linux/iopoll.h>
#include <linux/of.h>
+
#include <dt-bindings/clock/jz4780-cgu.h>
#include "cgu.h"
#include "pm.h"
/* CGU register offsets */
#define CGU_REG_CLOCKCONTROL 0x00
-#define CGU_REG_PLLCONTROL 0x0c
+#define CGU_REG_LCR 0x04
#define CGU_REG_APLL 0x10
#define CGU_REG_MPLL 0x14
#define CGU_REG_EPLL 0x18
@@ -46,8 +48,8 @@
#define CGU_REG_CLOCKSTATUS 0xd4
/* bits within the OPCR register */
-#define OPCR_SPENDN0 (1 << 7)
-#define OPCR_SPENDN1 (1 << 6)
+#define OPCR_SPENDN0 BIT(7)
+#define OPCR_SPENDN1 BIT(6)
/* bits within the USBPCR register */
#define USBPCR_USB_MODE BIT(31)
@@ -88,6 +90,13 @@
#define USBVBFIL_IDDIGFIL_MASK (0xffff << USBVBFIL_IDDIGFIL_SHIFT)
#define USBVBFIL_USBVBFIL_MASK (0xffff)
+/* bits within the LCR register */
+#define LCR_PD_SCPU BIT(31)
+#define LCR_SCPUS BIT(27)
+
+/* bits within the CLKGR1 register */
+#define CLKGR1_CORE1 BIT(15)
+
static struct ingenic_cgu *cgu;
static u8 jz4780_otg_phy_get_parent(struct clk_hw *hw)
@@ -205,6 +214,42 @@ static const struct clk_ops jz4780_otg_phy_ops = {
.set_rate = jz4780_otg_phy_set_rate,
};
+static int jz4780_core1_enable(struct clk_hw *hw)
+{
+ struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
+ struct ingenic_cgu *cgu = ingenic_clk->cgu;
+ const unsigned int timeout = 5000;
+ unsigned long flags;
+ int retval;
+ u32 lcr, clkgr1;
+
+ spin_lock_irqsave(&cgu->lock, flags);
+
+ lcr = readl(cgu->base + CGU_REG_LCR);
+ lcr &= ~LCR_PD_SCPU;
+ writel(lcr, cgu->base + CGU_REG_LCR);
+
+ clkgr1 = readl(cgu->base + CGU_REG_CLKGR1);
+ clkgr1 &= ~CLKGR1_CORE1;
+ writel(clkgr1, cgu->base + CGU_REG_CLKGR1);
+
+ spin_unlock_irqrestore(&cgu->lock, flags);
+
+ /* wait for the CPU to be powered up */
+ retval = readl_poll_timeout(cgu->base + CGU_REG_LCR, lcr,
+ !(lcr & LCR_SCPUS), 10, timeout);
+ if (retval == -ETIMEDOUT) {
+ pr_err("%s: Wait for power up core1 timeout\n", __func__);
+ return retval;
+ }
+
+ return 0;
+}
+
+static const struct clk_ops jz4780_core1_ops = {
+ .enable = jz4780_core1_enable,
+};
+
static const s8 pll_od_encoding[16] = {
0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7,
0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
@@ -701,9 +746,9 @@ static const struct ingenic_cgu_clk_info jz4780_cgu_clocks[] = {
},
[JZ4780_CLK_CORE1] = {
- "core1", CGU_CLK_GATE,
+ "core1", CGU_CLK_CUSTOM,
.parents = { JZ4780_CLK_CPU, -1, -1, -1 },
- .gate = { CGU_REG_CLKGR1, 15 },
+ .custom = { &jz4780_core1_ops },
},
};
--
2.7.4
