[PATCH 1/2] clk: hisilicon: add hi3620_mmc_clks
Zhangfei Gao
zhangfei.gao at linaro.org
Mon Jan 13 04:14:28 EST 2014
Suggest by Arnd: abstract mmc tuning as clock behavior,
also because different soc have different tuning method and registers.
hi3620_mmc_clks is added to handle mmc clock specifically on hi3620.
Signed-off-by: Zhangfei Gao <zhangfei.gao at linaro.org>
Acked-by: Arnd Bergmann <arnd at arndb.de>
Acked-by: Jaehoon Chung <jh80.chung at samsung.com>
---
.../bindings/arm/hisilicon/hisilicon.txt | 14 +
.../devicetree/bindings/clock/hi3620-clock.txt | 1 +
drivers/clk/hisilicon/clk-hi3620.c | 267 ++++++++++++++++++++
include/dt-bindings/clock/hi3620-clock.h | 5 +
4 files changed, 287 insertions(+)
diff --git a/Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt b/Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt
index 8c7a4653508d..df0a452b8526 100644
--- a/Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt
+++ b/Documentation/devicetree/bindings/arm/hisilicon/hisilicon.txt
@@ -30,3 +30,17 @@ Example:
resume-offset = <0x308>;
reboot-offset = <0x4>;
};
+
+PCTRL: Peripheral misc control register
+
+Required Properties:
+- compatible: "hisilicon,pctrl"
+- reg: Address and size of pctrl.
+
+Example:
+
+ /* for Hi3620 */
+ pctrl: pctrl at fca09000 {
+ compatible = "hisilicon,pctrl";
+ reg = <0xfca09000 0x1000>;
+ };
diff --git a/Documentation/devicetree/bindings/clock/hi3620-clock.txt b/Documentation/devicetree/bindings/clock/hi3620-clock.txt
index 4b71ab41be53..dad6269f52c5 100644
--- a/Documentation/devicetree/bindings/clock/hi3620-clock.txt
+++ b/Documentation/devicetree/bindings/clock/hi3620-clock.txt
@@ -7,6 +7,7 @@ Required Properties:
- compatible: should be one of the following.
- "hisilicon,hi3620-clock" - controller compatible with Hi3620 SoC.
+ - "hisilicon,hi3620-mmc-clock" - controller specific for Hi3620 mmc.
- reg: physical base address of the controller and length of memory mapped
region.
diff --git a/drivers/clk/hisilicon/clk-hi3620.c b/drivers/clk/hisilicon/clk-hi3620.c
index f24ad6a3a797..54cc3475ec36 100644
--- a/drivers/clk/hisilicon/clk-hi3620.c
+++ b/drivers/clk/hisilicon/clk-hi3620.c
@@ -240,3 +240,270 @@ static void __init hi3620_clk_init(struct device_node *np)
base);
}
CLK_OF_DECLARE(hi3620_clk, "hisilicon,hi3620-clock", hi3620_clk_init);
+
+struct hisi_mmc_clock {
+ unsigned int id;
+ const char *name;
+ const char *parent_name;
+ unsigned long flags;
+ u32 clken_reg;
+ u32 clken_bit;
+ u32 div_reg;
+ u32 div_off;
+ u32 div_bits;
+ u32 drv_reg;
+ u32 drv_off;
+ u32 drv_bits;
+ u32 sam_reg;
+ u32 sam_off;
+ u32 sam_bits;
+};
+
+struct clk_mmc {
+ struct clk_hw hw;
+ u32 id;
+ void __iomem *clken_reg;
+ u32 clken_bit;
+ void __iomem *div_reg;
+ u32 div_off;
+ u32 div_bits;
+ void __iomem *drv_reg;
+ u32 drv_off;
+ u32 drv_bits;
+ void __iomem *sam_reg;
+ u32 sam_off;
+ u32 sam_bits;
+};
+
+#define to_mmc(_hw) container_of(_hw, struct clk_mmc, hw)
+
+static struct hisi_mmc_clock hi3620_mmc_clks[] __initdata = {
+ { HI3620_SD_CIUCLK, "sd_bclk1", "sd_clk", CLK_SET_RATE_PARENT, 0x1f8, 0, 0x1f8, 1, 3, 0x1f8, 4, 4, 0x1f8, 8, 4},
+ { HI3620_MMC_CIUCLK1, "mmc_bclk1", "mmc_clk1", CLK_SET_RATE_PARENT, 0x1f8, 12, 0x1f8, 13, 3, 0x1f8, 16, 4, 0x1f8, 20, 4},
+ { HI3620_MMC_CIUCLK2, "mmc_bclk2", "mmc_clk2", CLK_SET_RATE_PARENT, 0x1f8, 24, 0x1f8, 25, 3, 0x1f8, 28, 4, 0x1fc, 0, 4},
+ { HI3620_MMC_CIUCLK3, "mmc_bclk3", "mmc_clk3", CLK_SET_RATE_PARENT, 0x1fc, 4, 0x1fc, 5, 3, 0x1fc, 8, 4, 0x1fc, 12, 4},
+};
+
+static unsigned long mmc_clk_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ switch (parent_rate) {
+ case 26000000:
+ return 13000000;
+ case 180000000:
+ return 25000000;
+ case 360000000:
+ return 50000000;
+ case 720000000:
+ return 100000000;
+ default:
+ return parent_rate;
+ }
+}
+
+static long mmc_clk_determine_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *best_parent_rate,
+ struct clk **best_parent_p)
+{
+ struct clk_mmc *mclk = to_mmc(hw);
+ unsigned long best = 0;
+
+ if ((rate <= 13000000) && (mclk->id == HI3620_MMC_CIUCLK1)) {
+ rate = 13000000;
+ best = 26000000;
+ } else if (rate <= 26000000) {
+ rate = 25000000;
+ best = 180000000;
+ } else if (rate <= 52000000) {
+ rate = 50000000;
+ best = 360000000;
+ } else if (rate <= 100000000) {
+ rate = 100000000;
+ best = 720000000;
+ } else {
+ /* max is 180M */
+ rate = 180000000;
+ best = 1440000000;
+ }
+ *best_parent_rate = best;
+ return rate;
+}
+
+static u32 mmc_clk_delay(u32 val, u32 para, u32 off, u32 len)
+{
+ u32 i;
+
+ if (para >= 0) {
+ for (i = 0; i < len; i++) {
+ if (para % 2)
+ val |= 1 << (off + i);
+ else
+ val &= ~(1 << (off + i));
+ para = para >> 1;
+ }
+ }
+ return val;
+}
+
+static int mmc_clk_set_timing(struct clk_hw *hw, unsigned long rate)
+{
+ struct clk_mmc *mclk = to_mmc(hw);
+ unsigned long flags;
+ u32 sam, drv, div, val;
+ static DEFINE_SPINLOCK(mmc_clk_lock);
+
+ switch (rate) {
+ case 13000000:
+ sam = 3;
+ drv = 1;
+ div = 1;
+ break;
+ case 25000000:
+ sam = 13;
+ drv = 6;
+ div = 6;
+ break;
+ case 50000000:
+ sam = 3;
+ drv = 6;
+ div = 6;
+ break;
+ case 100000000:
+ sam = 6;
+ drv = 4;
+ div = 6;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&mmc_clk_lock, flags);
+
+ val = readl_relaxed(mclk->clken_reg);
+ val &= ~(1 << mclk->clken_bit);
+ writel_relaxed(val, mclk->clken_reg);
+
+ val = readl_relaxed(mclk->sam_reg);
+ val = mmc_clk_delay(val, sam, mclk->sam_off, mclk->sam_bits);
+ writel_relaxed(val, mclk->sam_reg);
+
+ val = readl_relaxed(mclk->drv_reg);
+ val = mmc_clk_delay(val, drv, mclk->drv_off, mclk->drv_bits);
+ writel_relaxed(val, mclk->drv_reg);
+
+ val = readl_relaxed(mclk->div_reg);
+ val = mmc_clk_delay(val, div, mclk->div_off, mclk->div_bits);
+ writel_relaxed(val, mclk->div_reg);
+
+ val = readl_relaxed(mclk->clken_reg);
+ val |= 1 << mclk->clken_bit;
+ writel_relaxed(val, mclk->clken_reg);
+
+ spin_unlock_irqrestore(&mmc_clk_lock, flags);
+
+ return 0;
+}
+
+static int mmc_clk_prepare(struct clk_hw *hw)
+{
+ struct clk_mmc *mclk = to_mmc(hw);
+ unsigned long rate;
+
+ if (mclk->id == HI3620_MMC_CIUCLK1)
+ rate = 13000000;
+ else
+ rate = 25000000;
+
+ return mmc_clk_set_timing(hw, rate);
+}
+
+static int mmc_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ return mmc_clk_set_timing(hw, rate);
+}
+
+static struct clk_ops clk_mmc_ops = {
+ .prepare = mmc_clk_prepare,
+ .determine_rate = mmc_clk_determine_rate,
+ .set_rate = mmc_clk_set_rate,
+ .recalc_rate = mmc_clk_recalc_rate,
+};
+
+static struct clk *hisi_register_clk_mmc(struct hisi_mmc_clock *mmc_clk,
+ void __iomem *base, struct device_node *np)
+{
+ struct clk_mmc *mclk;
+ struct clk *clk;
+ struct clk_init_data init;
+
+ mclk = kzalloc(sizeof(*mclk), GFP_KERNEL);
+ if (!mclk) {
+ pr_err("%s: fail to allocate mmc clk\n", __func__);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ init.name = mmc_clk->name;
+ init.ops = &clk_mmc_ops;
+ init.flags = mmc_clk->flags | CLK_IS_BASIC;
+ init.parent_names = (mmc_clk->parent_name ? &mmc_clk->parent_name : NULL);
+ init.num_parents = (mmc_clk->parent_name ? 1 : 0);
+ mclk->hw.init = &init;
+
+ mclk->id = mmc_clk->id;
+ mclk->clken_reg = base + mmc_clk->clken_reg;
+ mclk->clken_bit = mmc_clk->clken_bit;
+ mclk->div_reg = base + mmc_clk->div_reg;
+ mclk->div_off = mmc_clk->div_off;
+ mclk->div_bits = mmc_clk->div_bits;
+ mclk->drv_reg = base + mmc_clk->drv_reg;
+ mclk->drv_off = mmc_clk->drv_off;
+ mclk->drv_bits = mmc_clk->drv_bits;
+ mclk->sam_reg = base + mmc_clk->sam_reg;
+ mclk->sam_off = mmc_clk->sam_off;
+ mclk->sam_bits = mmc_clk->sam_bits;
+
+ clk = clk_register(NULL, &mclk->hw);
+ if (WARN_ON(IS_ERR(clk)))
+ kfree(mclk);
+ return clk;
+}
+
+static void __init hi3620_mmc_clk_init(struct device_node *node)
+{
+ void __iomem *base;
+ int i, num = ARRAY_SIZE(hi3620_mmc_clks);
+ struct clk_onecell_data *clk_data;
+
+ if (!node) {
+ pr_err("failed to find pctrl node in DTS\n");
+ return;
+ }
+
+ base = of_iomap(node, 0);
+ if (!base) {
+ pr_err("failed to map pctrl\n");
+ return;
+ }
+
+ clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
+ if (WARN_ON(!clk_data))
+ return;
+
+ clk_data->clks = kzalloc(sizeof(struct clk *) * num, GFP_KERNEL);
+ if (!clk_data->clks) {
+ pr_err("%s: fail to allocate mmc clk\n", __func__);
+ return;
+ }
+
+ for (i = 0; i < num; i++) {
+ struct hisi_mmc_clock *mmc_clk = &hi3620_mmc_clks[i];
+ clk_data->clks[mmc_clk->id] =
+ hisi_register_clk_mmc(mmc_clk, base, node);
+ }
+
+ clk_data->clk_num = num;
+ of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
+}
+
+CLK_OF_DECLARE(hi3620_mmc_clk, "hisilicon,hi3620-mmc-clock", hi3620_mmc_clk_init);
diff --git a/include/dt-bindings/clock/hi3620-clock.h b/include/dt-bindings/clock/hi3620-clock.h
index 6eaa6a45e110..21b9d0e2eb0c 100644
--- a/include/dt-bindings/clock/hi3620-clock.h
+++ b/include/dt-bindings/clock/hi3620-clock.h
@@ -147,6 +147,11 @@
#define HI3620_MMC_CLK3 217
#define HI3620_MCU_CLK 218
+#define HI3620_SD_CIUCLK 0
+#define HI3620_MMC_CIUCLK1 1
+#define HI3620_MMC_CIUCLK2 2
+#define HI3620_MMC_CIUCLK3 3
+
#define HI3620_NR_CLKS 219
#endif /* __DTS_HI3620_CLOCK_H */
--
1.7.9.5
More information about the linux-arm-kernel
mailing list