[PATCH v4 8/8] clk: baikal-t1: Convert to platform device driver

Serge Semin
2022-06-10T07:30:21Z

In accordance with the way the MIPS platform is normally design there are
only six clock sources which need to be available on the kernel start in
order to one end up booting correctly:
+ CPU PLL: needed by the r4k and MIPS GIC timer drivers. The former one is
initialized by the arch code, while the later one is implemented in the
mips-gic-timer.c driver as the OF-declared timer.
+ PCIe PLL: required as a parental clock source for the APB/timer domains.
+ APB clock: needed in order to access all the SoC CSRs at least for the
timer OF-declared drivers.
+ APB Timer{0-2} clocks: these are the DW APB timers which drivers
dw_apb_timer_of.c are implemented as the OF-declared timers.

So as long as the clocks above are available early the kernel will
normally work. Let's convert the Baikal-T1 CCU drivers to the platform
device drivers keeping that in mind.

Generally speaking the conversion isn't that complicated since the driver
infrastructure has been designed as flexible enough for that. First we
need to add a new PLL/Divider clock features flag which indicates the
corresponding clock source as a basic one and that clock sources will be
available on the kernel early boot stages. Second the internal PLL/Divider
descriptors need to be initialized with -EPROBE_DEFER value as the
corresponding clock source is unavailable at the early stages. They will
be allocated and initialized on the Baikal-T1 clock platform driver probe
procedure. Finally the already available PLL/Divider init functions need
to be split up into two ones: init procedure performed in the framework of
the OF-declared clock initialization (of_clk_init()), and the probe
procedure called by the platform devices bus driver. Note the later method
will just continue the system clocks initialization started in the former
one.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>

---

Changelog v4:
- This is a new patch created on v4 lap of the series to make @Stephen
a bit more happy about this series.)
---
drivers/clk/baikal-t1/ccu-div.h | 3 +
drivers/clk/baikal-t1/ccu-pll.h | 8 ++
drivers/clk/baikal-t1/clk-ccu-div.c | 149 +++++++++++++++++++++++-----
drivers/clk/baikal-t1/clk-ccu-pll.c | 128 +++++++++++++++++++-----
4 files changed, 235 insertions(+), 53 deletions(-)

diff --git a/drivers/clk/baikal-t1/ccu-div.h b/drivers/clk/baikal-t1/ccu-div.h
index ff97bb30fcc3..76d8ee44d415 100644
--- a/drivers/clk/baikal-t1/ccu-div.h
+++ b/drivers/clk/baikal-t1/ccu-div.h
@@ -23,6 +23,8 @@

/*
* CCU Divider private flags
+ * @CCU_DIV_BASIC: Basic divider clock required by the kernel as early as
+ * possible.
* @CCU_DIV_SKIP_ONE: Due to some reason divider can't be set to 1.
* It can be 0 though, which is functionally the same.
* @CCU_DIV_SKIP_ONE_TO_THREE: For some reason divider can't be within [1,3].
@@ -30,6 +32,7 @@
* @CCU_DIV_LOCK_SHIFTED: Find lock-bit at non-standard position.
* @CCU_DIV_RESET_DOMAIN: There is a clock domain reset handle.
*/
+#define CCU_DIV_BASIC BIT(0)
#define CCU_DIV_SKIP_ONE BIT(1)
#define CCU_DIV_SKIP_ONE_TO_THREE BIT(2)
#define CCU_DIV_LOCK_SHIFTED BIT(3)
diff --git a/drivers/clk/baikal-t1/ccu-pll.h b/drivers/clk/baikal-t1/ccu-pll.h
index 76cd9132a219..a71bfd7b90ec 100644
--- a/drivers/clk/baikal-t1/ccu-pll.h
+++ b/drivers/clk/baikal-t1/ccu-pll.h
@@ -13,6 +13,12 @@
#include <linux/bits.h>
#include <linux/of.h>

+/*
+ * CCU PLL private flags
+ * @CCU_PLL_BASIC: Basic PLL required by the kernel as early as possible.
+ */
+#define CCU_PLL_BASIC BIT(0)
+
/*
* struct ccu_pll_init_data - CCU PLL initialization data
* @id: Clock private identifier.
@@ -22,6 +28,7 @@
* @sys_regs: Baikal-T1 System Controller registers map.
* @np: Pointer to the node describing the CCU PLLs.
* @flags: PLL clock flags.
+ * @features: PLL private features.
*/
struct ccu_pll_init_data {
unsigned int id;
@@ -31,6 +38,7 @@ struct ccu_pll_init_data {
struct regmap *sys_regs;
struct device_node *np;
unsigned long flags;
+ unsigned long features;
};

/*
diff --git a/drivers/clk/baikal-t1/clk-ccu-div.c b/drivers/clk/baikal-t1/clk-ccu-div.c
index 71e563e28f86..9713ea71cfda 100644
--- a/drivers/clk/baikal-t1/clk-ccu-div.c
+++ b/drivers/clk/baikal-t1/clk-ccu-div.c
@@ -12,6 +12,7 @@
#define pr_fmt(fmt) "bt1-ccu-div: " fmt

#include <linux/kernel.h>
+#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/clk-provider.h>
@@ -201,7 +202,7 @@ static const struct ccu_div_info sys_info[] = {
CLK_SET_RATE_PARENT),
CCU_DIV_VAR_INFO(CCU_SYS_APB_CLK, "sys_apb_clk",
"pcie_clk", CCU_SYS_APB_BASE, 5,
- CLK_IS_CRITICAL, CCU_DIV_RESET_DOMAIN),
+ CLK_IS_CRITICAL, CCU_DIV_BASIC | CCU_DIV_RESET_DOMAIN),
CCU_DIV_GATE_INFO(CCU_SYS_GMAC0_TX_CLK, "sys_gmac0_tx_clk",
"eth_clk", CCU_SYS_GMAC0_BASE, 5),
CCU_DIV_FIXED_INFO(CCU_SYS_GMAC0_PTP_CLK, "sys_gmac0_ptp_clk",
@@ -235,28 +236,53 @@ static const struct ccu_div_info sys_info[] = {
"ref_clk", 25),
CCU_DIV_VAR_INFO(CCU_SYS_TIMER0_CLK, "sys_timer0_clk",
"ref_clk", CCU_SYS_TIMER0_BASE, 17,
- CLK_SET_RATE_GATE, 0),
+ CLK_SET_RATE_GATE, CCU_DIV_BASIC),
CCU_DIV_VAR_INFO(CCU_SYS_TIMER1_CLK, "sys_timer1_clk",
"ref_clk", CCU_SYS_TIMER1_BASE, 17,
- CLK_SET_RATE_GATE, 0),
+ CLK_SET_RATE_GATE, CCU_DIV_BASIC),
CCU_DIV_VAR_INFO(CCU_SYS_TIMER2_CLK, "sys_timer2_clk",
"ref_clk", CCU_SYS_TIMER2_BASE, 17,
- CLK_SET_RATE_GATE, 0),
+ CLK_SET_RATE_GATE, CCU_DIV_BASIC),
CCU_DIV_VAR_INFO(CCU_SYS_WDT_CLK, "sys_wdt_clk",
"eth_clk", CCU_SYS_WDT_BASE, 17,
CLK_SET_RATE_GATE, CCU_DIV_SKIP_ONE_TO_THREE)
};

+static struct ccu_div_data *axi_data;
+static struct ccu_div_data *sys_data;
+
+static void ccu_div_set_data(struct ccu_div_data *data)
+{
+ struct device_node *np = data->np;
+
+ if (of_device_is_compatible(np, "baikal,bt1-ccu-axi"))
+ axi_data = data;
+ else if (of_device_is_compatible(np, "baikal,bt1-ccu-sys"))
+ sys_data = data;
+ else
+ pr_err("Invalid DT node '%s' specified\n", of_node_full_name(np));
+}
+
+static struct ccu_div_data *ccu_div_get_data(struct device_node *np)
+{
+ if (of_device_is_compatible(np, "baikal,bt1-ccu-axi"))
+ return axi_data;
+ else if (of_device_is_compatible(np, "baikal,bt1-ccu-sys"))
+ return sys_data;
+
+ pr_err("Invalid DT node '%s' specified\n", of_node_full_name(np));
+
+ return NULL;
+}
+
static struct ccu_div *ccu_div_find_desc(struct ccu_div_data *data,
unsigned int clk_id)
{
- struct ccu_div *div;
int idx;

for (idx = 0; idx < data->divs_num; ++idx) {
- div = data->divs[idx];
- if (div && div->id == clk_id)
- return div;
+ if (data->divs_info[idx].id == clk_id)
+ return data->divs[idx];
}

return ERR_PTR(-EINVAL);
@@ -328,14 +354,16 @@ static struct clk_hw *ccu_div_of_clk_hw_get(struct of_phandle_args *clkspec,
clk_id = clkspec->args[0];
div = ccu_div_find_desc(data, clk_id);
if (IS_ERR(div)) {
- pr_info("Invalid clock ID %d specified\n", clk_id);
+ if (div != ERR_PTR(-EPROBE_DEFER))
+ pr_info("Invalid clock ID %d specified\n", clk_id);
+
return ERR_CAST(div);
}

return ccu_div_get_clk_hw(div);
}

-static int ccu_div_clk_register(struct ccu_div_data *data)
+static int ccu_div_clk_register(struct ccu_div_data *data, bool defer)
{
int idx, ret;

@@ -343,6 +371,13 @@ static int ccu_div_clk_register(struct ccu_div_data *data)
const struct ccu_div_info *info = &data->divs_info[idx];
struct ccu_div_init_data init = {0};

+ if (!!(info->features & CCU_DIV_BASIC) ^ defer) {
+ if (!data->divs[idx])
+ data->divs[idx] = ERR_PTR(-EPROBE_DEFER);
+
+ continue;
+ }
+
init.id = info->id;
init.name = info->name;
init.parent_name = info->parent_name;
@@ -375,30 +410,43 @@ static int ccu_div_clk_register(struct ccu_div_data *data)
}
}

- ret = of_clk_add_hw_provider(data->np, ccu_div_of_clk_hw_get, data);
- if (ret) {
- pr_err("Couldn't register dividers '%s' clock provider\n",
- of_node_full_name(data->np));
- goto err_hw_unregister;
- }
-
return 0;

err_hw_unregister:
- for (--idx; idx >= 0; --idx)
+ for (--idx; idx >= 0; --idx) {
+ if (!!(data->divs_info[idx].features & CCU_DIV_BASIC) ^ defer)
+ continue;
+
ccu_div_hw_unregister(data->divs[idx]);
+ }

return ret;
}

-static void ccu_div_clk_unregister(struct ccu_div_data *data)
+static void ccu_div_clk_unregister(struct ccu_div_data *data, bool defer)
{
int idx;

- of_clk_del_provider(data->np);
+ /* Uninstall only the clocks registered on the specfied stage */
+ for (idx = 0; idx < data->divs_num; ++idx) {
+ if (!!(data->divs_info[idx].features & CCU_DIV_BASIC) ^ defer)
+ continue;

- for (idx = 0; idx < data->divs_num; ++idx)
ccu_div_hw_unregister(data->divs[idx]);
+ }
+}
+
+static int ccu_div_of_register(struct ccu_div_data *data)
+{
+ int ret;
+
+ ret = of_clk_add_hw_provider(data->np, ccu_div_of_clk_hw_get, data);
+ if (ret) {
+ pr_err("Couldn't register dividers '%s' clock provider\n",
+ of_node_full_name(data->np));
+ }
+
+ return ret;
}

static int ccu_div_rst_register(struct ccu_div_data *data)
@@ -418,7 +466,49 @@ static int ccu_div_rst_register(struct ccu_div_data *data)
return 0;
}

-static void ccu_div_init(struct device_node *np)
+static int ccu_div_probe(struct platform_device *pdev)
+{
+ struct ccu_div_data *data;
+ int ret;
+
+ data = ccu_div_get_data(dev_of_node(&pdev->dev));
+ if (!data)
+ return -EINVAL;
+
+ ret = ccu_div_clk_register(data, false);
+ if (ret)
+ return ret;
+
+ ret = ccu_div_rst_register(data);
+ if (ret)
+ goto err_clk_unregister;
+
+ return 0;
+
+err_clk_unregister:
+ ccu_div_clk_unregister(data, false);
+
+ return ret;
+}
+
+static const struct of_device_id ccu_div_of_match[] = {
+ { .compatible = "baikal,bt1-ccu-axi" },
+ { .compatible = "baikal,bt1-ccu-sys" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ccu_div_of_match);
+
+static struct platform_driver ccu_div_driver = {
+ .probe = ccu_div_probe,
+ .driver = {
+ .name = "clk-ccu-div",
+ .of_match_table = ccu_div_of_match,
+ .suppress_bind_attrs = true,
+ },
+};
+builtin_platform_driver(ccu_div_driver);
+
+static __init void ccu_div_init(struct device_node *np)
{
struct ccu_div_data *data;
int ret;
@@ -431,22 +521,27 @@ static void ccu_div_init(struct device_node *np)
if (ret)
goto err_free_data;

- ret = ccu_div_clk_register(data);
+ ret = ccu_div_clk_register(data, true);
if (ret)
goto err_free_data;

- ret = ccu_div_rst_register(data);
+ ret = ccu_div_of_register(data);
if (ret)
goto err_clk_unregister;

+ ccu_div_set_data(data);
+
return;

err_clk_unregister:
- ccu_div_clk_unregister(data);
+ ccu_div_clk_unregister(data, true);

err_free_data:
ccu_div_free_data(data);
}
+CLK_OF_DECLARE_DRIVER(ccu_axi, "baikal,bt1-ccu-axi", ccu_div_init);
+CLK_OF_DECLARE_DRIVER(ccu_sys, "baikal,bt1-ccu-sys", ccu_div_init);

-CLK_OF_DECLARE(ccu_axi, "baikal,bt1-ccu-axi", ccu_div_init);
-CLK_OF_DECLARE(ccu_sys, "baikal,bt1-ccu-sys", ccu_div_init);
+MODULE_AUTHOR("Serge Semin <Sergey.Semin@baikalelectronics.ru>");
+MODULE_DESCRIPTION("Baikal-T1 CCU Dividers clock driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/clk/baikal-t1/clk-ccu-pll.c b/drivers/clk/baikal-t1/clk-ccu-pll.c
index 2445d4b12baf..ad420c6477ee 100644
--- a/drivers/clk/baikal-t1/clk-ccu-pll.c
+++ b/drivers/clk/baikal-t1/clk-ccu-pll.c
@@ -12,6 +12,7 @@
#define pr_fmt(fmt) "bt1-ccu-pll: " fmt

#include <linux/kernel.h>
+#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/clk-provider.h>
@@ -31,13 +32,14 @@
#define CCU_PCIE_PLL_BASE 0x018
#define CCU_ETH_PLL_BASE 0x020

-#define CCU_PLL_INFO(_id, _name, _pname, _base, _flags) \
- { \
- .id = _id, \
- .name = _name, \
- .parent_name = _pname, \
- .base = _base, \
- .flags = _flags \
+#define CCU_PLL_INFO(_id, _name, _pname, _base, _flags, _features) \
+ { \
+ .id = _id, \
+ .name = _name, \
+ .parent_name = _pname, \
+ .base = _base, \
+ .flags = _flags, \
+ .features = _features, \
}

#define CCU_PLL_NUM ARRAY_SIZE(pll_info)
@@ -48,6 +50,7 @@ struct ccu_pll_info {
const char *parent_name;
unsigned int base;
unsigned long flags;
+ unsigned long features;
};

/*
@@ -61,15 +64,15 @@ struct ccu_pll_info {
*/
static const struct ccu_pll_info pll_info[] = {
CCU_PLL_INFO(CCU_CPU_PLL, "cpu_pll", "ref_clk", CCU_CPU_PLL_BASE,
- CLK_IS_CRITICAL),
+ CLK_IS_CRITICAL, CCU_PLL_BASIC),
CCU_PLL_INFO(CCU_SATA_PLL, "sata_pll", "ref_clk", CCU_SATA_PLL_BASE,
- CLK_IS_CRITICAL | CLK_SET_RATE_GATE),
+ CLK_IS_CRITICAL | CLK_SET_RATE_GATE, 0),
CCU_PLL_INFO(CCU_DDR_PLL, "ddr_pll", "ref_clk", CCU_DDR_PLL_BASE,
- CLK_IS_CRITICAL | CLK_SET_RATE_GATE),
+ CLK_IS_CRITICAL | CLK_SET_RATE_GATE, 0),
CCU_PLL_INFO(CCU_PCIE_PLL, "pcie_pll", "ref_clk", CCU_PCIE_PLL_BASE,
- CLK_IS_CRITICAL),
+ CLK_IS_CRITICAL, CCU_PLL_BASIC),
CCU_PLL_INFO(CCU_ETH_PLL, "eth_pll", "ref_clk", CCU_ETH_PLL_BASE,
- CLK_IS_CRITICAL | CLK_SET_RATE_GATE)
+ CLK_IS_CRITICAL | CLK_SET_RATE_GATE, 0)
};

struct ccu_pll_data {
@@ -78,16 +81,16 @@ struct ccu_pll_data {
struct ccu_pll *plls[CCU_PLL_NUM];
};

+static struct ccu_pll_data *pll_data;
+
static struct ccu_pll *ccu_pll_find_desc(struct ccu_pll_data *data,
unsigned int clk_id)
{
- struct ccu_pll *pll;
int idx;

for (idx = 0; idx < CCU_PLL_NUM; ++idx) {
- pll = data->plls[idx];
- if (pll && pll->id == clk_id)
- return pll;
+ if (pll_info[idx].id == clk_id)
+ return data->plls[idx];
}

return ERR_PTR(-EINVAL);
@@ -133,14 +136,16 @@ static struct clk_hw *ccu_pll_of_clk_hw_get(struct of_phandle_args *clkspec,
clk_id = clkspec->args[0];
pll = ccu_pll_find_desc(data, clk_id);
if (IS_ERR(pll)) {
- pr_info("Invalid PLL clock ID %d specified\n", clk_id);
+ if (pll != ERR_PTR(-EPROBE_DEFER))
+ pr_info("Invalid PLL clock ID %d specified\n", clk_id);
+
return ERR_CAST(pll);
}

return ccu_pll_get_clk_hw(pll);
}

-static int ccu_pll_clk_register(struct ccu_pll_data *data)
+static int ccu_pll_clk_register(struct ccu_pll_data *data, bool defer)
{
int idx, ret;

@@ -148,6 +153,14 @@ static int ccu_pll_clk_register(struct ccu_pll_data *data)
const struct ccu_pll_info *info = &pll_info[idx];
struct ccu_pll_init_data init = {0};

+ /* Defer non-basic PLLs allocation for the probe stage */
+ if (!!(info->features & CCU_PLL_BASIC) ^ defer) {
+ if (!data->plls[idx])
+ data->plls[idx] = ERR_PTR(-EPROBE_DEFER);
+
+ continue;
+ }
+
init.id = info->id;
init.name = info->name;
init.parent_name = info->parent_name;
@@ -155,6 +168,7 @@ static int ccu_pll_clk_register(struct ccu_pll_data *data)
init.sys_regs = data->sys_regs;
init.np = data->np;
init.flags = info->flags;
+ init.features = info->features;

data->plls[idx] = ccu_pll_hw_register(&init);
if (IS_ERR(data->plls[idx])) {
@@ -165,22 +179,71 @@ static int ccu_pll_clk_register(struct ccu_pll_data *data)
}
}

+ return 0;
+
+err_hw_unregister:
+ for (--idx; idx >= 0; --idx) {
+ if (!!(pll_info[idx].features & CCU_PLL_BASIC) ^ defer)
+ continue;
+
+ ccu_pll_hw_unregister(data->plls[idx]);
+ }
+
+ return ret;
+}
+
+static void ccu_pll_clk_unregister(struct ccu_pll_data *data, bool defer)
+{
+ int idx;
+
+ /* Uninstall only the clocks registered on the specfied stage */
+ for (idx = 0; idx < CCU_PLL_NUM; ++idx) {
+ if (!!(pll_info[idx].features & CCU_PLL_BASIC) ^ defer)
+ continue;
+
+ ccu_pll_hw_unregister(data->plls[idx]);
+ }
+}
+
+static int ccu_pll_of_register(struct ccu_pll_data *data)
+{
+ int ret;
+
ret = of_clk_add_hw_provider(data->np, ccu_pll_of_clk_hw_get, data);
if (ret) {
pr_err("Couldn't register PLL provider of '%s'\n",
of_node_full_name(data->np));
- goto err_hw_unregister;
}

- return 0;
+ return ret;
+}

-err_hw_unregister:
- for (--idx; idx >= 0; --idx)
- ccu_pll_hw_unregister(data->plls[idx]);
+static int ccu_pll_probe(struct platform_device *pdev)
+{
+ struct ccu_pll_data *data = pll_data;

- return ret;
+ if (!data)
+ return -EINVAL;
+
+ return ccu_pll_clk_register(data, false);
}

+static const struct of_device_id ccu_pll_of_match[] = {
+ { .compatible = "baikal,bt1-ccu-pll" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ccu_pll_of_match);
+
+static struct platform_driver ccu_pll_driver = {
+ .probe = ccu_pll_probe,
+ .driver = {
+ .name = "clk-ccu-pll",
+ .of_match_table = ccu_pll_of_match,
+ .suppress_bind_attrs = true,
+ },
+};
+builtin_platform_driver(ccu_pll_driver);
+
static __init void ccu_pll_init(struct device_node *np)
{
struct ccu_pll_data *data;
@@ -194,13 +257,26 @@ static __init void ccu_pll_init(struct device_node *np)
if (ret)
goto err_free_data;

- ret = ccu_pll_clk_register(data);
+ ret = ccu_pll_clk_register(data, true);
if (ret)
goto err_free_data;

+ ret = ccu_pll_of_register(data);
+ if (ret)
+ goto err_clk_unregister;
+
+ pll_data = data;
+
return;

+err_clk_unregister:
+ ccu_pll_clk_unregister(data, true);
+
err_free_data:
ccu_pll_free_data(data);
}
-CLK_OF_DECLARE(ccu_pll, "baikal,bt1-ccu-pll", ccu_pll_init);
+CLK_OF_DECLARE_DRIVER(ccu_pll, "baikal,bt1-ccu-pll", ccu_pll_init);
+
+MODULE_AUTHOR("Serge Semin <Sergey.Semin@baikalelectronics.ru>");
+MODULE_DESCRIPTION("Baikal-T1 CCU PLL clock driver");
+MODULE_LICENSE("GPL");
--
2.35.1