[RFC v3 07/13] bcma: get CPU clock
Hauke Mehrtens
hauke at hauke-m.de
Wed Jun 29 18:11:52 EDT 2011
Add method to return the clock of the CPU. This is needed by the arch
code to calculate the mips_hpt_frequency.
Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
drivers/bcma/bcma_private.h | 3 +
drivers/bcma/driver_chipcommon_pmu.c | 87 +++++++++++++++++++++++++++
drivers/bcma/driver_mips.c | 12 ++++
include/linux/bcma/bcma_driver_chipcommon.h | 35 +++++++++++
include/linux/bcma/bcma_driver_mips.h | 1 +
5 files changed, 138 insertions(+), 0 deletions(-)
diff --git a/drivers/bcma/bcma_private.h b/drivers/bcma/bcma_private.h
index 4597178..d25dedd 100644
--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -29,6 +29,9 @@ void bcma_init_bus(struct bcma_bus *bus);
/* sprom.c */
int bcma_sprom_get(struct bcma_bus *bus);
+/* driver_chipcommon_pmu.c */
+extern u32 bcma_pmu_get_clockcpu(struct bcma_drv_cc *cc);
+
/* driver_chipcommon.c */
#ifdef CONFIG_BCMA_DRIVER_MIPS
extern int bcma_chipco_serial_init(struct bcma_drv_cc *cc,
diff --git a/drivers/bcma/driver_chipcommon_pmu.c b/drivers/bcma/driver_chipcommon_pmu.c
index dd5846b..d9aa9ef 100644
--- a/drivers/bcma/driver_chipcommon_pmu.c
+++ b/drivers/bcma/driver_chipcommon_pmu.c
@@ -11,6 +11,13 @@
#include "bcma_private.h"
#include <linux/bcma/bcma.h>
+static u32 bcma_chipco_pll_read(struct bcma_drv_cc *cc, u32 offset)
+{
+ bcma_cc_write32(cc, BCMA_CC_PLLCTL_ADDR, offset);
+ bcma_cc_read32(cc, BCMA_CC_PLLCTL_ADDR);
+ return bcma_cc_read32(cc, BCMA_CC_PLLCTL_DATA);
+}
+
static void bcma_chipco_chipctl_maskset(struct bcma_drv_cc *cc,
u32 offset, u32 mask, u32 set)
{
@@ -136,3 +143,83 @@ void bcma_pmu_init(struct bcma_drv_cc *cc)
bcma_pmu_swreg_init(cc);
bcma_pmu_workarounds(cc);
}
+
+static u32 bcma_pmu_alp_clock(struct bcma_drv_cc *cc)
+{
+ struct bcma_bus *bus = cc->core->bus;
+
+ switch (bus->chipinfo.id) {
+ case 0x4716:
+ case 0x4748:
+ case 47162:
+ /* always 20Mhz */
+ return 20000 * 1000;
+ default:
+ pr_warn("No ALP clock specified for %04X device, "
+ "pmu rev. %d, using default %d Hz\n",
+ bus->chipinfo.id, cc->pmu.rev, BCMA_CC_PMU_ALP_CLOCK);
+ }
+ return BCMA_CC_PMU_ALP_CLOCK;
+}
+
+/* Find the output of the "m" pll divider given pll controls that start with
+ * pllreg "pll0" i.e. 12 for main 6 for phy, 0 for misc.
+ */
+static u32 bcma_pmu_clock(struct bcma_drv_cc *cc, u32 pll0, u32 m)
+{
+ u32 tmp, div, ndiv, p1, p2, fc;
+
+ BUG_ON(!m || m > 4);
+
+ BUG_ON((pll0 & 3) || (pll0 > BCMA_CC_PMU4716_MAINPLL_PLL0));
+
+ tmp = bcma_chipco_pll_read(cc, pll0 + BCMA_CC_PPL_P1P2_OFF);
+ p1 = (tmp & BCMA_CC_PPL_P1_MASK) >> BCMA_CC_PPL_P1_SHIFT;
+ p2 = (tmp & BCMA_CC_PPL_P2_MASK) >> BCMA_CC_PPL_P2_SHIFT;
+
+ tmp = bcma_chipco_pll_read(cc, pll0 + BCMA_CC_PPL_M14_OFF);
+ div = (tmp >> ((m - 1) * BCMA_CC_PPL_MDIV_WIDTH)) &
+ BCMA_CC_PPL_MDIV_MASK;
+
+ tmp = bcma_chipco_pll_read(cc, pll0 + BCMA_CC_PPL_NM5_OFF);
+ ndiv = (tmp & BCMA_CC_PPL_NDIV_MASK) >> BCMA_CC_PPL_NDIV_SHIFT;
+
+ /* Do calculation in Mhz */
+ fc = bcma_pmu_alp_clock(cc) / 1000000;
+ fc = (p1 * ndiv * fc) / p2;
+
+ /* Return clock in Hertz */
+ return (fc / div) * 1000000;
+}
+
+/* query bus clock frequency for PMU-enabled chipcommon */
+u32 bcma_pmu_get_clockcontrol(struct bcma_drv_cc *cc)
+{
+ struct bcma_bus *bus = cc->core->bus;
+
+ switch (bus->chipinfo.id) {
+ case 0x4716:
+ case 0x4748:
+ case 47162:
+ return bcma_pmu_clock(cc, BCMA_CC_PMU4716_MAINPLL_PLL0,
+ BCMA_CC_PMU5_MAINPLL_SSB);
+ default:
+ pr_warn("No backplane clock specified for %04X device, "
+ "pmu rev. %d, using default %d Hz\n",
+ bus->chipinfo.id, cc->pmu.rev, BCMA_CC_PMU_HT_CLOCK);
+ }
+ return BCMA_CC_PMU_HT_CLOCK;
+}
+
+/* query cpu clock frequency for PMU-enabled chipcommon */
+u32 bcma_pmu_get_clockcpu(struct bcma_drv_cc *cc)
+{
+ struct bcma_bus *bus = cc->core->bus;
+
+ if ((cc->pmu.rev == 5 || cc->pmu.rev == 6 || cc->pmu.rev == 7) &&
+ (bus->chipinfo.id != 0x4319))
+ return bcma_pmu_clock(cc, BCMA_CC_PMU4716_MAINPLL_PLL0,
+ BCMA_CC_PMU5_MAINPLL_CPU);
+
+ return bcma_pmu_get_clockcontrol(cc);
+}
diff --git a/drivers/bcma/driver_mips.c b/drivers/bcma/driver_mips.c
index 3989fb9..813f9df 100644
--- a/drivers/bcma/driver_mips.c
+++ b/drivers/bcma/driver_mips.c
@@ -156,6 +156,18 @@ static void bcma_core_mips_dump_irq(struct bcma_bus *bus)
}
}
+u32 bcma_cpu_clock(struct bcma_drv_mips *mcore)
+{
+ struct bcma_bus *bus = mcore->core->bus;
+
+ if (bus->drv_cc.capabilities & BCMA_CC_CAP_PMU)
+ return bcma_pmu_get_clockcpu(&bus->drv_cc);
+
+ pr_err("No PMU available, need this to get the cpu clock\n");
+ return 0;
+}
+EXPORT_SYMBOL(bcma_cpu_clock);
+
static void bcma_core_mips_serial_init(struct bcma_drv_mips *mcore)
{
struct bcma_bus *bus = mcore->core->bus;
diff --git a/include/linux/bcma/bcma_driver_chipcommon.h b/include/linux/bcma/bcma_driver_chipcommon.h
index c036f73..1974ef3 100644
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -246,6 +246,41 @@
#define BCMA_CC_PLLCTL_DATA 0x0664
#define BCMA_CC_SPROM 0x0830 /* SPROM beginning */
+/* Divider allocation in 4716/47162/5356 */
+#define BCMA_CC_PMU5_MAINPLL_CPU 1
+#define BCMA_CC_PMU5_MAINPLL_MEM 2
+#define BCMA_CC_PMU5_MAINPLL_SSB 3
+
+/* PLL usage in 4716/47162 */
+#define BCMA_CC_PMU4716_MAINPLL_PLL0 12
+
+/* ALP clock on pre-PMU chips */
+#define BCMA_CC_PMU_ALP_CLOCK 20000000
+/* HT clock for systems with PMU-enabled chipcommon */
+#define BCMA_CC_PMU_HT_CLOCK 80000000
+
+/* PMU rev 5 (& 6) */
+#define BCMA_CC_PPL_P1P2_OFF 0
+#define BCMA_CC_PPL_P1_MASK 0x0f000000
+#define BCMA_CC_PPL_P1_SHIFT 24
+#define BCMA_CC_PPL_P2_MASK 0x00f00000
+#define BCMA_CC_PPL_P2_SHIFT 20
+#define BCMA_CC_PPL_M14_OFF 1
+#define BCMA_CC_PPL_MDIV_MASK 0x000000ff
+#define BCMA_CC_PPL_MDIV_WIDTH 8
+#define BCMA_CC_PPL_NM5_OFF 2
+#define BCMA_CC_PPL_NDIV_MASK 0xfff00000
+#define BCMA_CC_PPL_NDIV_SHIFT 20
+#define BCMA_CC_PPL_FMAB_OFF 3
+#define BCMA_CC_PPL_MRAT_MASK 0xf0000000
+#define BCMA_CC_PPL_MRAT_SHIFT 28
+#define BCMA_CC_PPL_ABRAT_MASK 0x08000000
+#define BCMA_CC_PPL_ABRAT_SHIFT 27
+#define BCMA_CC_PPL_FDIV_MASK 0x07ffffff
+#define BCMA_CC_PPL_PLLCTL_OFF 4
+#define BCMA_CC_PPL_PCHI_OFF 5
+#define BCMA_CC_PPL_PCHI_MASK 0x0000003f
+
/* Data for the PMU, if available.
* Check availability with ((struct bcma_chipcommon)->capabilities & BCMA_CC_CAP_PMU)
*/
diff --git a/include/linux/bcma/bcma_driver_mips.h b/include/linux/bcma/bcma_driver_mips.h
index 13b44c2..402af95 100644
--- a/include/linux/bcma/bcma_driver_mips.h
+++ b/include/linux/bcma/bcma_driver_mips.h
@@ -54,6 +54,7 @@ struct bcma_drv_mips {
};
extern void bcma_core_mips_init(struct bcma_drv_mips *mcore);
+extern u32 bcma_cpu_clock(struct bcma_drv_mips *mcore);
extern unsigned int bcma_core_mips_irq(struct bcma_device *dev);
--
1.7.4.1
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