mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-20 19:23:57 +08:00
CPUFREQ: S3C24XX NAND driver frequency scaling support.
Add support for CPU frequency scalling to the S3C24XX NAND driver. Signed-off-by: Ben Dooks <ben-linux@fluff.org> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Ben Dooks
David Woodhouse
parent
ee39a0e61b
commit
30821fee4f
@ -36,6 +36,7 @@
|
||||
#include <linux/err.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/cpufreq.h>
|
||||
|
||||
#include <linux/mtd/mtd.h>
|
||||
#include <linux/mtd/nand.h>
|
||||
@ -104,8 +105,13 @@ struct s3c2410_nand_info {
|
||||
int sel_bit;
|
||||
int mtd_count;
|
||||
unsigned long save_sel;
|
||||
unsigned long clk_rate;
|
||||
|
||||
enum s3c_cpu_type cpu_type;
|
||||
|
||||
#ifdef CONFIG_CPU_FREQ
|
||||
struct notifier_block freq_transition;
|
||||
#endif
|
||||
};
|
||||
|
||||
/* conversion functions */
|
||||
@ -163,17 +169,18 @@ static int s3c_nand_calc_rate(int wanted, unsigned long clk, int max)
|
||||
|
||||
/* controller setup */
|
||||
|
||||
static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
|
||||
struct platform_device *pdev)
|
||||
static int s3c2410_nand_setrate(struct s3c2410_nand_info *info)
|
||||
{
|
||||
struct s3c2410_platform_nand *plat = to_nand_plat(pdev);
|
||||
unsigned long clkrate = clk_get_rate(info->clk);
|
||||
struct s3c2410_platform_nand *plat = info->platform;
|
||||
int tacls_max = (info->cpu_type == TYPE_S3C2412) ? 8 : 4;
|
||||
int tacls, twrph0, twrph1;
|
||||
unsigned long cfg = 0;
|
||||
unsigned long clkrate = clk_get_rate(info->clk);
|
||||
unsigned long set, cfg, mask;
|
||||
unsigned long flags;
|
||||
|
||||
/* calculate the timing information for the controller */
|
||||
|
||||
info->clk_rate = clkrate;
|
||||
clkrate /= 1000; /* turn clock into kHz for ease of use */
|
||||
|
||||
if (plat != NULL) {
|
||||
@ -195,28 +202,69 @@ static int s3c2410_nand_inithw(struct s3c2410_nand_info *info,
|
||||
dev_info(info->device, "Tacls=%d, %dns Twrph0=%d %dns, Twrph1=%d %dns\n",
|
||||
tacls, to_ns(tacls, clkrate), twrph0, to_ns(twrph0, clkrate), twrph1, to_ns(twrph1, clkrate));
|
||||
|
||||
switch (info->cpu_type) {
|
||||
case TYPE_S3C2410:
|
||||
mask = (S3C2410_NFCONF_TACLS(3) |
|
||||
S3C2410_NFCONF_TWRPH0(7) |
|
||||
S3C2410_NFCONF_TWRPH1(7));
|
||||
set = S3C2410_NFCONF_EN;
|
||||
set |= S3C2410_NFCONF_TACLS(tacls - 1);
|
||||
set |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
|
||||
set |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
|
||||
break;
|
||||
|
||||
case TYPE_S3C2440:
|
||||
case TYPE_S3C2412:
|
||||
mask = (S3C2410_NFCONF_TACLS(tacls_max - 1) |
|
||||
S3C2410_NFCONF_TWRPH0(7) |
|
||||
S3C2410_NFCONF_TWRPH1(7));
|
||||
|
||||
set = S3C2440_NFCONF_TACLS(tacls - 1);
|
||||
set |= S3C2440_NFCONF_TWRPH0(twrph0 - 1);
|
||||
set |= S3C2440_NFCONF_TWRPH1(twrph1 - 1);
|
||||
break;
|
||||
|
||||
default:
|
||||
/* keep compiler happy */
|
||||
mask = 0;
|
||||
set = 0;
|
||||
BUG();
|
||||
}
|
||||
|
||||
dev_dbg(info->device, "NF_CONF is 0x%lx\n", cfg);
|
||||
|
||||
local_irq_save(flags);
|
||||
|
||||
cfg = readl(info->regs + S3C2410_NFCONF);
|
||||
cfg &= ~mask;
|
||||
cfg |= set;
|
||||
writel(cfg, info->regs + S3C2410_NFCONF);
|
||||
|
||||
local_irq_restore(flags);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int s3c2410_nand_inithw(struct s3c2410_nand_info *info)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = s3c2410_nand_setrate(info);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
switch (info->cpu_type) {
|
||||
case TYPE_S3C2410:
|
||||
cfg = S3C2410_NFCONF_EN;
|
||||
cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
|
||||
cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
|
||||
cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
|
||||
default:
|
||||
break;
|
||||
|
||||
case TYPE_S3C2440:
|
||||
case TYPE_S3C2412:
|
||||
cfg = S3C2440_NFCONF_TACLS(tacls - 1);
|
||||
cfg |= S3C2440_NFCONF_TWRPH0(twrph0 - 1);
|
||||
cfg |= S3C2440_NFCONF_TWRPH1(twrph1 - 1);
|
||||
|
||||
/* enable the controller and de-assert nFCE */
|
||||
|
||||
writel(S3C2440_NFCONT_ENABLE, info->regs + S3C2440_NFCONT);
|
||||
}
|
||||
|
||||
dev_dbg(info->device, "NF_CONF is 0x%lx\n", cfg);
|
||||
|
||||
writel(cfg, info->regs + S3C2410_NFCONF);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -497,6 +545,52 @@ static void s3c2440_nand_write_buf(struct mtd_info *mtd, const u_char *buf, int
|
||||
writesl(info->regs + S3C2440_NFDATA, buf, len / 4);
|
||||
}
|
||||
|
||||
/* cpufreq driver support */
|
||||
|
||||
#ifdef CONFIG_CPU_FREQ
|
||||
|
||||
static int s3c2410_nand_cpufreq_transition(struct notifier_block *nb,
|
||||
unsigned long val, void *data)
|
||||
{
|
||||
struct s3c2410_nand_info *info;
|
||||
unsigned long newclk;
|
||||
|
||||
info = container_of(nb, struct s3c2410_nand_info, freq_transition);
|
||||
newclk = clk_get_rate(info->clk);
|
||||
|
||||
if ((val == CPUFREQ_POSTCHANGE && newclk < info->clk_rate) ||
|
||||
(val == CPUFREQ_PRECHANGE && newclk > info->clk_rate)) {
|
||||
s3c2410_nand_setrate(info);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline int s3c2410_nand_cpufreq_register(struct s3c2410_nand_info *info)
|
||||
{
|
||||
info->freq_transition.notifier_call = s3c2410_nand_cpufreq_transition;
|
||||
|
||||
return cpufreq_register_notifier(&info->freq_transition,
|
||||
CPUFREQ_TRANSITION_NOTIFIER);
|
||||
}
|
||||
|
||||
static inline void s3c2410_nand_cpufreq_deregister(struct s3c2410_nand_info *info)
|
||||
{
|
||||
cpufreq_unregister_notifier(&info->freq_transition,
|
||||
CPUFREQ_TRANSITION_NOTIFIER);
|
||||
}
|
||||
|
||||
#else
|
||||
static inline int s3c2410_nand_cpufreq_register(struct s3c2410_nand_info *info)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline void s3c2410_nand_cpufreq_deregister(struct s3c2410_nand_info *info)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
/* device management functions */
|
||||
|
||||
static int s3c2410_nand_remove(struct platform_device *pdev)
|
||||
@ -508,9 +602,10 @@ static int s3c2410_nand_remove(struct platform_device *pdev)
|
||||
if (info == NULL)
|
||||
return 0;
|
||||
|
||||
/* first thing we need to do is release all our mtds
|
||||
* and their partitions, then go through freeing the
|
||||
* resources used
|
||||
s3c2410_nand_cpufreq_deregister(info);
|
||||
|
||||
/* Release all our mtds and their partitions, then go through
|
||||
* freeing the resources used
|
||||
*/
|
||||
|
||||
if (info->mtds != NULL) {
|
||||
@ -769,7 +864,7 @@ static int s3c24xx_nand_probe(struct platform_device *pdev,
|
||||
|
||||
/* initialise the hardware */
|
||||
|
||||
err = s3c2410_nand_inithw(info, pdev);
|
||||
err = s3c2410_nand_inithw(info);
|
||||
if (err != 0)
|
||||
goto exit_error;
|
||||
|
||||
@ -812,6 +907,12 @@ static int s3c24xx_nand_probe(struct platform_device *pdev,
|
||||
sets++;
|
||||
}
|
||||
|
||||
err = s3c2410_nand_cpufreq_register(info);
|
||||
if (err < 0) {
|
||||
dev_err(&pdev->dev, "failed to init cpufreq support\n");
|
||||
goto exit_error;
|
||||
}
|
||||
|
||||
if (allow_clk_stop(info)) {
|
||||
dev_info(&pdev->dev, "clock idle support enabled\n");
|
||||
clk_disable(info->clk);
|
||||
@ -859,7 +960,7 @@ static int s3c24xx_nand_resume(struct platform_device *dev)
|
||||
|
||||
if (info) {
|
||||
clk_enable(info->clk);
|
||||
s3c2410_nand_inithw(info, dev);
|
||||
s3c2410_nand_inithw(info);
|
||||
|
||||
/* Restore the state of the nFCE line. */
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user