bcma: add PMU clock support for BCM4706

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Tested-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/bcma/driver_chipcommon_pmu.c b/drivers/bcma/driver_chipcommon_pmu.c
index 74a87d5..4432617 100644 (file)
--- a/drivers/bcma/driver_chipcommon_pmu.c
+++ b/drivers/bcma/driver_chipcommon_pmu.c
@@ -226,6 +226,36 @@ static u32 bcma_pmu_clock(struct bcma_drv_cc *cc, u32 pll0, u32 m)
        return (fc / div) * 1000000;
 }
 
+static u32 bcma_pmu_clock_bcm4706(struct bcma_drv_cc *cc, u32 pll0, u32 m)
+{
+       u32 tmp, ndiv, p1div, p2div;
+       u32 clock;
+
+       BUG_ON(!m || m > 4);
+
+       /* Get N, P1 and P2 dividers to determine CPU clock */
+       tmp = bcma_chipco_pll_read(cc, pll0 + BCMA_CC_PMU6_4706_PROCPLL_OFF);
+       ndiv = (tmp & BCMA_CC_PMU6_4706_PROC_NDIV_INT_MASK)
+               >> BCMA_CC_PMU6_4706_PROC_NDIV_INT_SHIFT;
+       p1div = (tmp & BCMA_CC_PMU6_4706_PROC_P1DIV_MASK)
+               >> BCMA_CC_PMU6_4706_PROC_P1DIV_SHIFT;
+       p2div = (tmp & BCMA_CC_PMU6_4706_PROC_P2DIV_MASK)
+               >> BCMA_CC_PMU6_4706_PROC_P2DIV_SHIFT;
+
+       tmp = bcma_cc_read32(cc, BCMA_CC_CHIPSTAT);
+       if (tmp & BCMA_CC_CHIPST_4706_PKG_OPTION)
+               /* Low cost bonding: Fixed reference clock 25MHz and m = 4 */
+               clock = (25000000 / 4) * ndiv * p2div / p1div;
+       else
+               /* Fixed reference clock 25MHz and m = 2 */
+               clock = (25000000 / 2) * ndiv * p2div / p1div;
+
+       if (m == BCMA_CC_PMU5_MAINPLL_SSB)
+               clock = clock / 4;
+
+       return clock;
+}
+
 /* query bus clock frequency for PMU-enabled chipcommon */
 u32 bcma_pmu_get_clockcontrol(struct bcma_drv_cc *cc)
 {
@@ -245,8 +275,8 @@ u32 bcma_pmu_get_clockcontrol(struct bcma_drv_cc *cc)
                return bcma_pmu_clock(cc, BCMA_CC_PMU5357_MAINPLL_PLL0,
                                      BCMA_CC_PMU5_MAINPLL_SSB);
        case BCMA_CHIP_ID_BCM4706:
-               return bcma_pmu_clock(cc, BCMA_CC_PMU4706_MAINPLL_PLL0,
-                                     BCMA_CC_PMU5_MAINPLL_SSB);
+               return bcma_pmu_clock_bcm4706(cc, BCMA_CC_PMU4706_MAINPLL_PLL0,
+                                             BCMA_CC_PMU5_MAINPLL_SSB);
        case BCMA_CHIP_ID_BCM53572:
                return 75000000;
        default:
@@ -267,6 +297,10 @@ u32 bcma_pmu_get_clockcpu(struct bcma_drv_cc *cc)
        if (cc->pmu.rev >= 5) {
                u32 pll;
                switch (bus->chipinfo.id) {
+               case BCMA_CHIP_ID_BCM4706:
+                       return bcma_pmu_clock_bcm4706(cc,
+                                               BCMA_CC_PMU4706_MAINPLL_PLL0,
+                                               BCMA_CC_PMU5_MAINPLL_CPU);
                case BCMA_CHIP_ID_BCM5356:
                        pll = BCMA_CC_PMU5356_MAINPLL_PLL0;
                        break;
@@ -279,8 +313,6 @@ u32 bcma_pmu_get_clockcpu(struct bcma_drv_cc *cc)
                        break;
                }
 
-               /* TODO: if (bus->chipinfo.id == BCMA_CHIP_ID_BCM4706)
-                 return si_4706_pmu_clock(sih, osh, cc, PMU4706_MAINPLL_PLL0, PMU5_MAINPLL_CPU); */
                return bcma_pmu_clock(cc, pll, BCMA_CC_PMU5_MAINPLL_CPU);
        }
 

diff --git a/include/linux/bcma/bcma_driver_chipcommon.h b/include/linux/bcma/bcma_driver_chipcommon.h
index 12975ea..fbd0d49 100644 (file)
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -88,6 +88,11 @@
 #define  BCMA_CC_CHIPST_4313_OTP_PRESENT       2
 #define  BCMA_CC_CHIPST_4331_SPROM_PRESENT     2
 #define  BCMA_CC_CHIPST_4331_OTP_PRESENT       4
+#define  BCMA_CC_CHIPST_4706_PKG_OPTION                BIT(0) /* 0: full-featured package 1: low-cost package */
+#define  BCMA_CC_CHIPST_4706_SFLASH_PRESENT    BIT(1) /* 0: parallel, 1: serial flash is present */
+#define  BCMA_CC_CHIPST_4706_SFLASH_TYPE       BIT(2) /* 0: 8b-p/ST-s flash, 1: 16b-p/Atmal-s flash */
+#define  BCMA_CC_CHIPST_4706_MIPS_BENDIAN      BIT(3) /* 0: little, 1: big endian */
+#define  BCMA_CC_CHIPST_4706_PCIE1_DISABLE     BIT(5) /* PCIE1 enable strap pin */
 #define BCMA_CC_JCMD                   0x0030          /* Rev >= 10 only */
 #define  BCMA_CC_JCMD_START            0x80000000
 #define  BCMA_CC_JCMD_BUSY             0x80000000
@@ -280,6 +285,15 @@
 
 /* 4706 PMU */
 #define BCMA_CC_PMU4706_MAINPLL_PLL0   0
+#define BCMA_CC_PMU6_4706_PROCPLL_OFF  4       /* The CPU PLL */
+#define  BCMA_CC_PMU6_4706_PROC_P2DIV_MASK     0x000f0000
+#define  BCMA_CC_PMU6_4706_PROC_P2DIV_SHIFT    16
+#define  BCMA_CC_PMU6_4706_PROC_P1DIV_MASK     0x0000f000
+#define  BCMA_CC_PMU6_4706_PROC_P1DIV_SHIFT    12
+#define  BCMA_CC_PMU6_4706_PROC_NDIV_INT_MASK  0x00000ff8
+#define  BCMA_CC_PMU6_4706_PROC_NDIV_INT_SHIFT 3
+#define  BCMA_CC_PMU6_4706_PROC_NDIV_MODE_MASK 0x00000007
+#define  BCMA_CC_PMU6_4706_PROC_NDIV_MODE_SHIFT        0
 
 /* ALP clock on pre-PMU chips */
 #define BCMA_CC_PMU_ALP_CLOCK          20000000