[PATCH 15/19] cpufreq: s5pv210: Make the driver multiplatform aware

Tomasz Figa
2014-07-04T17:48:15Z

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linux-pm at vger.kernel.org
---
drivers/cpufreq/s5pv210-cpufreq.c | 131 +++++++++++++++++++++++++++++++++++---
1 file changed, 122 insertions(+), 9 deletions(-)

diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index 19a10b8..9a68225 100644
--- a/drivers/cpufreq/s5pv210-cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -16,11 +16,70 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/cpufreq.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regulator/consumer.h>

-#include <mach/map.h>
-#include <mach/regs-clock.h>
+static void __iomem *clk_base;
+static void __iomem *dmc_base[2];
+
+#define S5P_CLKREG(x) (clk_base + (x))
+
+#define S5P_APLL_LOCK S5P_CLKREG(0x00)
+#define S5P_APLL_CON S5P_CLKREG(0x100)
+#define S5P_CLK_SRC0 S5P_CLKREG(0x200)
+#define S5P_CLK_SRC2 S5P_CLKREG(0x208)
+#define S5P_CLK_DIV0 S5P_CLKREG(0x300)
+#define S5P_CLK_DIV2 S5P_CLKREG(0x308)
+#define S5P_CLK_DIV6 S5P_CLKREG(0x318)
+#define S5P_CLKDIV_STAT0 S5P_CLKREG(0x1000)
+#define S5P_CLKDIV_STAT1 S5P_CLKREG(0x1004)
+#define S5P_CLKMUX_STAT0 S5P_CLKREG(0x1100)
+#define S5P_CLKMUX_STAT1 S5P_CLKREG(0x1104)
+
+#define S5P_ARM_MCS_CON S5P_CLKREG(0x6100)
+
+/* CLKSRC0 */
+#define S5P_CLKSRC0_MUX200_SHIFT (16)
+#define S5P_CLKSRC0_MUX200_MASK (0x1 << S5P_CLKSRC0_MUX200_SHIFT)
+#define S5P_CLKSRC0_MUX166_MASK (0x1<<20)
+#define S5P_CLKSRC0_MUX133_MASK (0x1<<24)
+
+/* CLKSRC2 */
+#define S5P_CLKSRC2_G3D_SHIFT (0)
+#define S5P_CLKSRC2_G3D_MASK (0x3 << S5P_CLKSRC2_G3D_SHIFT)
+#define S5P_CLKSRC2_MFC_SHIFT (4)
+#define S5P_CLKSRC2_MFC_MASK (0x3 << S5P_CLKSRC2_MFC_SHIFT)
+
+/* CLKDIV0 */
+#define S5P_CLKDIV0_APLL_SHIFT (0)
+#define S5P_CLKDIV0_APLL_MASK (0x7 << S5P_CLKDIV0_APLL_SHIFT)
+#define S5P_CLKDIV0_A2M_SHIFT (4)
+#define S5P_CLKDIV0_A2M_MASK (0x7 << S5P_CLKDIV0_A2M_SHIFT)
+#define S5P_CLKDIV0_HCLK200_SHIFT (8)
+#define S5P_CLKDIV0_HCLK200_MASK (0x7 << S5P_CLKDIV0_HCLK200_SHIFT)
+#define S5P_CLKDIV0_PCLK100_SHIFT (12)
+#define S5P_CLKDIV0_PCLK100_MASK (0x7 << S5P_CLKDIV0_PCLK100_SHIFT)
+#define S5P_CLKDIV0_HCLK166_SHIFT (16)
+#define S5P_CLKDIV0_HCLK166_MASK (0xF << S5P_CLKDIV0_HCLK166_SHIFT)
+#define S5P_CLKDIV0_PCLK83_SHIFT (20)
+#define S5P_CLKDIV0_PCLK83_MASK (0x7 << S5P_CLKDIV0_PCLK83_SHIFT)
+#define S5P_CLKDIV0_HCLK133_SHIFT (24)
+#define S5P_CLKDIV0_HCLK133_MASK (0xF << S5P_CLKDIV0_HCLK133_SHIFT)
+#define S5P_CLKDIV0_PCLK66_SHIFT (28)
+#define S5P_CLKDIV0_PCLK66_MASK (0x7 << S5P_CLKDIV0_PCLK66_SHIFT)
+
+/* CLKDIV2 */
+#define S5P_CLKDIV2_G3D_SHIFT (0)
+#define S5P_CLKDIV2_G3D_MASK (0xF << S5P_CLKDIV2_G3D_SHIFT)
+#define S5P_CLKDIV2_MFC_SHIFT (4)
+#define S5P_CLKDIV2_MFC_MASK (0xF << S5P_CLKDIV2_MFC_SHIFT)
+
+/* CLKDIV6 */
+#define S5P_CLKDIV6_ONEDRAM_SHIFT (28)
+#define S5P_CLKDIV6_ONEDRAM_MASK (0xF << S5P_CLKDIV6_ONEDRAM_SHIFT)

static struct clk *dmc0_clk;
static struct clk *dmc1_clk;
@@ -142,9 +201,9 @@ static void s5pv210_set_refresh(enum s5pv210_dmc_port ch, unsigned long freq)
void __iomem *reg = NULL;

if (ch == DMC0) {
- reg = (S5P_VA_DMC0 + 0x30);
+ reg = (dmc_base[0] + 0x30);
} else if (ch == DMC1) {
- reg = (S5P_VA_DMC1 + 0x30);
+ reg = (dmc_base[1] + 0x30);
} else {
printk(KERN_ERR "Cannot find DMC port\n");
return;
@@ -472,7 +531,7 @@ static int __init s5pv210_cpu_init(struct cpufreq_policy *policy)
* check_mem_type : This driver only support LPDDR & LPDDR2.
* other memory type is not supported.
*/
- mem_type = check_mem_type(S5P_VA_DMC0);
+ mem_type = check_mem_type(dmc_base[0]);

if ((mem_type != LPDDR) && (mem_type != LPDDR2)) {
printk(KERN_ERR "CPUFreq doesn't support this memory type\n");
@@ -481,10 +540,10 @@ static int __init s5pv210_cpu_init(struct cpufreq_policy *policy)
}

/* Find current refresh counter and frequency each DMC */
- s5pv210_dram_conf[0].refresh = (__raw_readl(S5P_VA_DMC0 + 0x30) * 1000);
+ s5pv210_dram_conf[0].refresh = (__raw_readl(dmc_base[0] + 0x30) * 1000);
s5pv210_dram_conf[0].freq = clk_get_rate(dmc0_clk);

- s5pv210_dram_conf[1].refresh = (__raw_readl(S5P_VA_DMC1 + 0x30) * 1000);
+ s5pv210_dram_conf[1].refresh = (__raw_readl(dmc_base[1] + 0x30) * 1000);
s5pv210_dram_conf[1].freq = clk_get_rate(dmc1_clk);

policy->suspend_freq = SLEEP_FREQ;
@@ -527,8 +586,55 @@ static struct notifier_block s5pv210_cpufreq_reboot_notifier = {
.notifier_call = s5pv210_cpufreq_reboot_notifier_event,
};

-static int __init s5pv210_cpufreq_init(void)
+static int s5pv210_cpufreq_probe(struct platform_device *pdev)
{
+ struct device_node *np;
+ int id;
+
+ /*
+ * HACK: This is a temporary workaround to get access to clock
+ * and DMC controller registers directly and remove static mappings
+ * and dependencies on platform headers. It is necessary to enable
+ * S5PV210 multi-platform support and will be removed together with
+ * this whole driver as soon as S5PV210 gets migrated to use
+ * cpufreq-cpu0 driver.
+ */
+ np = of_find_compatible_node(NULL, NULL, "samsung,s5pv210-clock");
+ if (!np) {
+ pr_err("%s: failed to find clock controller DT node\n",
+ __func__);
+ return -ENODEV;
+ }
+
+ clk_base = of_iomap(np, 0);
+ if (!clk_base) {
+ pr_err("%s: failed to map clock registers\n", __func__);
+ return -EFAULT;
+ }
+
+ for_each_compatible_node(np, NULL, "samsung,s5pv210-dmc") {
+ id = of_alias_get_id(np, "dmc");
+ if (id < 0 || id >= ARRAY_SIZE(dmc_base)) {
+ pr_err("%s: failed to get alias of dmc node '%s'\n",
+ __func__, np->name);
+ return id;
+ }
+
+ dmc_base[id] = of_iomap(np, 0);
+ if (!dmc_base[id]) {
+ pr_err("%s: failed to map dmc%d registers\n",
+ __func__, id);
+ return -EFAULT;
+ }
+ }
+
+ for (id = 0; id < ARRAY_SIZE(dmc_base); ++id) {
+ if (!dmc_base[id]) {
+ pr_err("%s: failed to find dmc%d node\n", __func__, id);
+ return -ENODEV;
+ }
+ }
+
arm_regulator = regulator_get(NULL, "vddarm");
if (IS_ERR(arm_regulator)) {
pr_err("failed to get regulator vddarm");
@@ -547,4 +653,11 @@ static int __init s5pv210_cpufreq_init(void)
return cpufreq_register_driver(&s5pv210_driver);
}

-late_initcall(s5pv210_cpufreq_init);
+static struct platform_driver s5pv210_cpufreq_platdrv = {
+ .driver = {
+ .name = "s5pv210-cpufreq",
+ .owner = THIS_MODULE,
+ },
+ .probe = s5pv210_cpufreq_probe,
+};
+module_platform_driver(s5pv210_cpufreq_platdrv);
--
1.9.3