#undef DEBUG
#include <linux/kernel.h>
-
+#include <linux/spinlock.h>
+#include <linux/of_platform.h>
#include <asm/io.h>
#include <asm/prom.h>
-#include <asm/of_platform.h>
#include <asm/mpc52xx.h>
+/* MPC5200 device tree match tables */
+static struct of_device_id mpc52xx_xlb_ids[] __initdata = {
+ { .compatible = "fsl,mpc5200-xlb", },
+ { .compatible = "mpc5200-xlb", },
+ {}
+};
+static struct of_device_id mpc52xx_bus_ids[] __initdata = {
+ { .compatible = "fsl,mpc5200-immr", },
+ { .compatible = "fsl,mpc5200b-immr", },
+ { .compatible = "fsl,lpb", },
+
+ /* depreciated matches; shouldn't be used in new device trees */
+ { .type = "builtin", .compatible = "mpc5200", }, /* efika */
+ { .type = "soc", .compatible = "mpc5200", }, /* lite5200 */
+ {}
+};
-void __iomem *
-mpc52xx_find_and_map(const char *compatible)
-{
- struct device_node *ofn;
- const u32 *regaddr_p;
- u64 regaddr64, size64;
-
- ofn = of_find_compatible_node(NULL, NULL, compatible);
- if (!ofn)
- return NULL;
-
- regaddr_p = of_get_address(ofn, 0, &size64, NULL);
- if (!regaddr_p) {
- of_node_put(ofn);
- return NULL;
- }
-
- regaddr64 = of_translate_address(ofn, regaddr_p);
-
- of_node_put(ofn);
-
- return ioremap((u32)regaddr64, (u32)size64);
-}
-EXPORT_SYMBOL(mpc52xx_find_and_map);
-
+/*
+ * This variable is mapped in mpc52xx_map_wdt() and used in mpc52xx_restart().
+ * Permanent mapping is required because mpc52xx_restart() can be called
+ * from interrupt context while node mapping (which calls ioremap())
+ * cannot be used at such point.
+ */
+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
EXPORT_SYMBOL(mpc52xx_find_ipb_freq);
+/*
+ * Configure the XLB arbiter settings to match what Linux expects.
+ */
void __init
-mpc52xx_setup_cpu(void)
+mpc5200_setup_xlb_arbiter(void)
{
- struct mpc52xx_cdm __iomem *cdm;
+ struct device_node *np;
struct mpc52xx_xlb __iomem *xlb;
- /* Map zones */
- cdm = mpc52xx_find_and_map("mpc5200-cdm");
- xlb = mpc52xx_find_and_map("mpc5200-xlb");
-
- if (!cdm || !xlb) {
+ np = of_find_matching_node(NULL, mpc52xx_xlb_ids);
+ xlb = of_iomap(np, 0);
+ of_node_put(np);
+ if (!xlb) {
printk(KERN_ERR __FILE__ ": "
- "Error while mapping CDM/XLB during mpc52xx_setup_cpu. "
+ "Error mapping XLB in mpc52xx_setup_cpu(). "
"Expect some abnormal behavior\n");
- goto unmap_regs;
+ return;
}
- /* Use internal 48 Mhz */
- out_8(&cdm->ext_48mhz_en, 0x00);
- out_8(&cdm->fd_enable, 0x01);
- if (in_be32(&cdm->rstcfg) & 0x40) /* Assumes 33Mhz clock */
- out_be16(&cdm->fd_counters, 0x0001);
- else
- out_be16(&cdm->fd_counters, 0x5555);
-
/* Configure the XLB Arbiter priorities */
out_be32(&xlb->master_pri_enable, 0xff);
out_be32(&xlb->master_priority, 0x11111111);
- /* Disable XLB pipelining */
- /* (cfr errate 292. We could do this only just before ATA PIO
- transaction and re-enable it afterwards ...) */
+ /* Disable XLB pipelining
+ * (cfr errate 292. We could do this only just before ATA PIO
+ * transaction and re-enable it afterwards ...)
+ */
out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS);
- /* Unmap zones */
-unmap_regs:
- if (cdm) iounmap(cdm);
- if (xlb) iounmap(xlb);
+ iounmap(xlb);
}
+/**
+ * mpc52xx_declare_of_platform_devices: register internal devices and children
+ * of the localplus bus to the of_platform
+ * bus.
+ */
void __init
mpc52xx_declare_of_platform_devices(void)
{
/* Find every child of the SOC node and add it to of_platform */
- if (of_platform_bus_probe(NULL, NULL, NULL))
+ if (of_platform_bus_probe(NULL, mpc52xx_bus_ids, NULL))
printk(KERN_ERR __FILE__ ": "
"Error while probing of_platform bus\n");
}
+/*
+ * 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_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.
+ */
+ for_each_matching_node(np, mpc52xx_gpt_ids) {
+ if (of_get_property(np, "fsl,has-wdt", NULL) ||
+ of_get_property(np, "has-wdt", NULL)) {
+ mpc52xx_wdt = of_iomap(np, 0);
+ of_node_put(np);
+ 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)
+{
+ local_irq_disable();
+
+ /* Turn on the watchdog and wait for it to expire.
+ * It effectively does a reset. */
+ if (mpc52xx_wdt) {
+ out_be32(&mpc52xx_wdt->mode, 0x00000000);
+ out_be32(&mpc52xx_wdt->count, 0x000000ff);
+ out_be32(&mpc52xx_wdt->mode, 0x00009004);
+ } else
+ printk("mpc52xx_restart: Can't access wdt. "
+ "Restart impossible, system halted.\n");
+
+ while (1);
+}
git.openpandora.org / pandora-kernel.git / blobdiff