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Message-Id: <20201204070901.24592-1-huangshuosheng@allwinnertech.com>
Date: Fri, 4 Dec 2020 15:09:01 +0800
From: Shuosheng Huang <huangshuosheng@...winnertech.com>
To: robh+dt@...nel.org, mripard@...nel.org, wens@...e.org,
jernej.skrabec@...l.net, rjw@...ysocki.net,
viresh.kumar@...aro.org, tiny.windzz@...il.com
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
Shuosheng Huang <huangshuosheng@...winnertech.com>
Subject: [PATCH 1/2] cpufreq: sun50i: add a100 cpufreq support
Let's add cpufreq nvmem based for allwinner a100 soc. It's similar to h6,
let us use efuse_xlate to extract the differentiated part.
Signed-off-by: Shuosheng Huang <huangshuosheng@...winnertech.com>
---
drivers/cpufreq/cpufreq-dt-platdev.c | 1 +
drivers/cpufreq/sun50i-cpufreq-nvmem.c | 81 ++++++++++++++++++++------
2 files changed, 64 insertions(+), 18 deletions(-)
diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
index 3776d960f405..2ebf5d9cb616 100644
--- a/drivers/cpufreq/cpufreq-dt-platdev.c
+++ b/drivers/cpufreq/cpufreq-dt-platdev.c
@@ -102,6 +102,7 @@ static const struct of_device_id whitelist[] __initconst = {
*/
static const struct of_device_id blacklist[] __initconst = {
{ .compatible = "allwinner,sun50i-h6", },
+ { .compatible = "allwinner,sun50i-a100", },
{ .compatible = "calxeda,highbank", },
{ .compatible = "calxeda,ecx-2000", },
diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
index 9907a165135b..044e44a763f5 100644
--- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
+++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
@@ -21,21 +21,63 @@
#define NVMEM_MASK 0x7
#define NVMEM_SHIFT 5
+#define SUN50I_A100_NVMEM_MASK 0xf
+#define SUN50I_A100_NVMEM_SHIFT 12
+
+#define SUN50I_H6_NVMEM_MASK 0x7
+#define SUN50I_H6_NVMEM_SHIFT 5
+
+struct sunxi_cpufreq_soc_data {
+ u32 (*efuse_xlate)(void *efuse);
+};
static struct platform_device *cpufreq_dt_pdev, *sun50i_cpufreq_pdev;
+static u32 sun50i_a100_efuse_xlate(void *efuse)
+{
+ u32 efuse_value = (*(u16 *)efuse >> SUN50I_A100_NVMEM_SHIFT) &
+ SUN50I_A100_NVMEM_MASK;
+
+ switch (efuse_value) {
+ case 0b100:
+ return 2;
+ case 0b010:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static u32 sun50i_h6_efuse_xlate(void *efuse)
+{
+ u32 efuse_value = (*(u32 *)efuse >> SUN50I_H6_NVMEM_SHIFT) &
+ SUN50I_H6_NVMEM_MASK;
+
+ /*
+ * We treat unexpected efuse values as if the SoC was from
+ * the slowest bin. Expected efuse values are 1-3, slowest
+ * to fastest.
+ */
+ if (efuse_value >= 1 && efuse_value <= 3)
+ return efuse_value - 1;
+ else
+ return 0;
+}
+
/**
* sun50i_cpufreq_get_efuse() - Determine speed grade from efuse value
+ * @soc_data: pointer to sunxi_cpufreq_soc_data context
* @versions: Set to the value parsed from efuse
*
* Returns 0 if success.
*/
-static int sun50i_cpufreq_get_efuse(u32 *versions)
+static int sun50i_cpufreq_get_efuse(const struct sunxi_cpufreq_soc_data *soc_data,
+ u32 *versions)
{
struct nvmem_cell *speedbin_nvmem;
struct device_node *np;
struct device *cpu_dev;
- u32 *speedbin, efuse_value;
+ u32 *speedbin;
size_t len;
int ret;
@@ -68,17 +110,7 @@ static int sun50i_cpufreq_get_efuse(u32 *versions)
if (IS_ERR(speedbin))
return PTR_ERR(speedbin);
- efuse_value = (*speedbin >> NVMEM_SHIFT) & NVMEM_MASK;
-
- /*
- * We treat unexpected efuse values as if the SoC was from
- * the slowest bin. Expected efuse values are 1-3, slowest
- * to fastest.
- */
- if (efuse_value >= 1 && efuse_value <= 3)
- *versions = efuse_value - 1;
- else
- *versions = 0;
+ *versions = soc_data->efuse_xlate(speedbin);
kfree(speedbin);
return 0;
@@ -86,18 +118,23 @@ static int sun50i_cpufreq_get_efuse(u32 *versions)
static int sun50i_cpufreq_nvmem_probe(struct platform_device *pdev)
{
+ const struct of_device_id *match;
struct opp_table **opp_tables;
char name[MAX_NAME_LEN];
unsigned int cpu;
u32 speed = 0;
int ret;
+ match = dev_get_platdata(&pdev->dev);
+ if (!match)
+ return -EINVAL;
+
opp_tables = kcalloc(num_possible_cpus(), sizeof(*opp_tables),
GFP_KERNEL);
if (!opp_tables)
return -ENOMEM;
- ret = sun50i_cpufreq_get_efuse(&speed);
+ ret = sun50i_cpufreq_get_efuse(match->data, &speed);
if (ret)
return ret;
@@ -163,8 +200,17 @@ static struct platform_driver sun50i_cpufreq_driver = {
},
};
+static const struct sunxi_cpufreq_soc_data sun50i_a100_data = {
+ .efuse_xlate = sun50i_a100_efuse_xlate,
+};
+
+static const struct sunxi_cpufreq_soc_data sun50i_h6_data = {
+ .efuse_xlate = sun50i_h6_efuse_xlate,
+};
+
static const struct of_device_id sun50i_cpufreq_match_list[] = {
- { .compatible = "allwinner,sun50i-h6" },
+ { .compatible = "allwinner,sun50i-h6", .data = &sun50i_h6_data },
+ { .compatible = "allwinner,sun50i-a100", .data = &sun50i_a100_data },
{}
};
@@ -198,9 +244,8 @@ static int __init sun50i_cpufreq_init(void)
if (unlikely(ret < 0))
return ret;
- sun50i_cpufreq_pdev =
- platform_device_register_simple("sun50i-cpufreq-nvmem",
- -1, NULL, 0);
+ sun50i_cpufreq_pdev = platform_device_register_data(NULL,
+ "sun50i-cpufreq-nvmem", -1, match, sizeof(*match));
ret = PTR_ERR_OR_ZERO(sun50i_cpufreq_pdev);
if (ret == 0)
return 0;
--
2.28.0
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