diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/platforms/52xx/mpc52xx_common.c | 65 |
1 files changed, 61 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_common.c b/arch/powerpc/platforms/52xx/mpc52xx_common.c index 744eb3a34ec9..9aa4425d80b2 100644 --- a/arch/powerpc/platforms/52xx/mpc52xx_common.c +++ b/arch/powerpc/platforms/52xx/mpc52xx_common.c @@ -13,6 +13,7 @@ #undef DEBUG #include <linux/kernel.h> +#include <linux/spinlock.h> #include <linux/of_platform.h> #include <asm/io.h> #include <asm/prom.h> @@ -41,7 +42,9 @@ static struct of_device_id mpc52xx_bus_ids[] __initdata = { * from interrupt context while node mapping (which calls ioremap()) * cannot be used at such point. */ -static volatile struct mpc52xx_gpt *mpc52xx_wdt = NULL; +static spinlock_t mpc52xx_lock = SPIN_LOCK_UNLOCKED; +static struct mpc52xx_gpt __iomem *mpc52xx_wdt; +static struct mpc52xx_cdm __iomem *mpc52xx_cdm; /** * mpc52xx_find_ipb_freq - Find the IPB bus frequency for a device @@ -120,18 +123,27 @@ mpc52xx_declare_of_platform_devices(void) } /* - * match tables used by mpc52xx_map_wdt() + * match tables used by mpc52xx_map_common_devices() */ static struct of_device_id mpc52xx_gpt_ids[] __initdata = { { .compatible = "fsl,mpc5200-gpt", }, { .compatible = "mpc5200-gpt", }, /* old */ {} }; +static struct of_device_id mpc52xx_cdm_ids[] __initdata = { + { .compatible = "fsl,mpc5200-cdm", }, + { .compatible = "mpc5200-cdm", }, /* old */ + {} +}; +/** + * mpc52xx_map_common_devices: iomap devices required by common code + */ void __init -mpc52xx_map_wdt(void) +mpc52xx_map_common_devices(void) { struct device_node *np; + /* mpc52xx_wdt is mapped here and used in mpc52xx_restart, * possibly from a interrupt context. wdt is only implement * on a gpt0, so check has-wdt property before mapping. @@ -141,11 +153,56 @@ mpc52xx_map_wdt(void) of_get_property(np, "has-wdt", NULL)) { mpc52xx_wdt = of_iomap(np, 0); of_node_put(np); - return; + break; } } + + /* Clock Distribution Module, used by PSC clock setting function */ + np = of_find_matching_node(NULL, mpc52xx_cdm_ids); + mpc52xx_cdm = of_iomap(np, 0); + of_node_put(np); } +/** + * mpc52xx_set_psc_clkdiv: Set clock divider in the CDM for PSC ports + * + * @psc_id: id of psc port; must be 1,2,3 or 6 + * @clkdiv: clock divider value to put into CDM PSC register. + */ +int mpc52xx_set_psc_clkdiv(int psc_id, int clkdiv) +{ + unsigned long flags; + u16 __iomem *reg; + u32 val; + u32 mask; + u32 mclken_div; + + if (!mpc52xx_cdm) + return -ENODEV; + + mclken_div = 0x8000 | (clkdiv & 0x1FF); + switch (psc_id) { + case 1: reg = &mpc52xx_cdm->mclken_div_psc1; mask = 0x20; break; + case 2: reg = &mpc52xx_cdm->mclken_div_psc2; mask = 0x40; break; + case 3: reg = &mpc52xx_cdm->mclken_div_psc3; mask = 0x80; break; + case 6: reg = &mpc52xx_cdm->mclken_div_psc6; mask = 0x10; break; + default: + return -ENODEV; + } + + /* Set the rate and enable the clock */ + spin_lock_irqsave(&mpc52xx_lock, flags); + out_be16(reg, mclken_div); + val = in_be32(&mpc52xx_cdm->clk_enables); + out_be32(&mpc52xx_cdm->clk_enables, val | mask); + spin_unlock_irqrestore(&mpc52xx_lock, flags); + + return 0; +} + +/** + * mpc52xx_restart: ppc_md->restart hook for mpc5200 using the watchdog timer + */ void mpc52xx_restart(char *cmd) { |