MIPS: Netlogic: XLP2XX CPU and PIC frequency

Add code to calculate the CPU and PIC frequency for XLP2XX SoCs.

Since the PIC frequency on XLP2XX can be configured, add a new macro
pic_timer_freq() to be used in netlogic/common/time.c.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Cc: Ganesan Ramalingam <ganesanr@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/5701/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

5 files changed, 153 insertions, 11 deletions

diff --git a/arch/mips/include/asm/netlogic/xlp-hal/pic.h b/arch/mips/include/asm/netlogic/xlp-hal/pic.h
index 4b5108dfaa16..105389b79f09 100644
--- a/arch/mips/include/asm/netlogic/xlp-hal/pic.h
+++ b/arch/mips/include/asm/netlogic/xlp-hal/pic.h
@@ -208,13 +208,14 @@
 #define PIC_LOCAL_SCHEDULING            1
 #define PIC_GLOBAL_SCHEDULING           0
 
-#define PIC_CLK_HZ                      133333333
-
 #define nlm_read_pic_reg(b, r)  nlm_read_reg64(b, r)
 #define nlm_write_pic_reg(b, r, v) nlm_write_reg64(b, r, v)
 #define nlm_get_pic_pcibase(node) nlm_pcicfg_base(XLP_IO_PIC_OFFSET(node))
 #define nlm_get_pic_regbase(node) (nlm_get_pic_pcibase(node) + XLP_IO_PCI_HDRSZ)
 
+/* We use PIC on node 0 as a timer */
+#define pic_timer_freq()                nlm_get_pic_frequency(0)
+
 /* IRT and h/w interrupt routines */
 static inline int
 nlm_pic_read_irt(uint64_t base, int irt_index)
diff --git a/arch/mips/include/asm/netlogic/xlp-hal/sys.h b/arch/mips/include/asm/netlogic/xlp-hal/sys.h
index 470e52bfc061..fcf2833c16ca 100644
--- a/arch/mips/include/asm/netlogic/xlp-hal/sys.h
+++ b/arch/mips/include/asm/netlogic/xlp-hal/sys.h
@@ -117,6 +117,36 @@
 #define SYS_SCRTCH2                             0x4b
 #define SYS_SCRTCH3                             0x4c
 
+/* PLL registers XLP2XX */
+#define SYS_PLL_CTRL0                           0x240
+#define SYS_PLL_CTRL1                           0x241
+#define SYS_PLL_CTRL2                           0x242
+#define SYS_PLL_CTRL3                           0x243
+#define SYS_DMC_PLL_CTRL0                       0x244
+#define SYS_DMC_PLL_CTRL1                       0x245
+#define SYS_DMC_PLL_CTRL2                       0x246
+#define SYS_DMC_PLL_CTRL3                       0x247
+
+#define SYS_PLL_CTRL0_DEVX(x)                   (0x248 + (x) * 4)
+#define SYS_PLL_CTRL1_DEVX(x)                   (0x249 + (x) * 4)
+#define SYS_PLL_CTRL2_DEVX(x)                   (0x24a + (x) * 4)
+#define SYS_PLL_CTRL3_DEVX(x)                   (0x24b + (x) * 4)
+
+#define SYS_CPU_PLL_CHG_CTRL                    0x288
+#define SYS_PLL_CHG_CTRL                        0x289
+#define SYS_CLK_DEV_DIS                         0x28a
+#define SYS_CLK_DEV_SEL                         0x28b
+#define SYS_CLK_DEV_DIV                         0x28c
+#define SYS_CLK_DEV_CHG                         0x28d
+#define SYS_CLK_DEV_SEL_REG                     0x28e
+#define SYS_CLK_DEV_DIV_REG                     0x28f
+#define SYS_CPU_PLL_LOCK                        0x29f
+#define SYS_SYS_PLL_LOCK                        0x2a0
+#define SYS_PLL_MEM_CMD                         0x2a1
+#define SYS_CPU_PLL_MEM_REQ                     0x2a2
+#define SYS_SYS_PLL_MEM_REQ                     0x2a3
+#define SYS_PLL_MEM_STAT                        0x2a4
+
 #ifndef __ASSEMBLY__
 
 #define nlm_read_sys_reg(b, r)          nlm_read_reg(b, r)
@@ -124,5 +154,6 @@
 #define nlm_get_sys_pcibase(node) nlm_pcicfg_base(XLP_IO_SYS_OFFSET(node))
 #define nlm_get_sys_regbase(node) (nlm_get_sys_pcibase(node) + XLP_IO_PCI_HDRSZ)
 
+unsigned int nlm_get_pic_frequency(int node);
 #endif
 #endif
diff --git a/arch/mips/include/asm/netlogic/xlr/pic.h b/arch/mips/include/asm/netlogic/xlr/pic.h
index 63c99176dffe..3c80a75233bd 100644
--- a/arch/mips/include/asm/netlogic/xlr/pic.h
+++ b/arch/mips/include/asm/netlogic/xlr/pic.h
@@ -36,6 +36,8 @@
 #define _ASM_NLM_XLR_PIC_H
 
 #define PIC_CLK_HZ                      66666666
+#define pic_timer_freq()                PIC_CLK_HZ
+
 /* PIC hardware interrupt numbers */
 #define PIC_IRT_WD_INDEX                0
 #define PIC_IRT_TIMER_0_INDEX           1
diff --git a/arch/mips/netlogic/common/time.c b/arch/mips/netlogic/common/time.c
index 045a396c57ce..13391b8a6031 100644
--- a/arch/mips/netlogic/common/time.c
+++ b/arch/mips/netlogic/common/time.c
@@ -45,6 +45,7 @@
 #if defined(CONFIG_CPU_XLP)
 #include <asm/netlogic/xlp-hal/iomap.h>
 #include <asm/netlogic/xlp-hal/xlp.h>
+#include <asm/netlogic/xlp-hal/sys.h>
 #include <asm/netlogic/xlp-hal/pic.h>
 #elif defined(CONFIG_CPU_XLR)
 #include <asm/netlogic/xlr/iomap.h>
@@ -91,7 +92,7 @@ static void nlm_init_pic_timer(void)
                 csrc_pic.read   = nlm_get_pic_timer;
         }
         csrc_pic.rating = 1000;
-        clocksource_register_hz(&csrc_pic, PIC_CLK_HZ);
+        clocksource_register_hz(&csrc_pic, pic_timer_freq());
 }
 
 void __init plat_time_init(void)
diff --git a/arch/mips/netlogic/xlp/nlm_hal.c b/arch/mips/netlogic/xlp/nlm_hal.c
index 6f2c21008ddb..22e2e028fbe4 100644
--- a/arch/mips/netlogic/xlp/nlm_hal.c
+++ b/arch/mips/netlogic/xlp/nlm_hal.c
@@ -127,18 +127,125 @@ unsigned int nlm_get_core_frequency(int node, int core)
 
         sysbase = nlm_get_node(node)->sysbase;
         rstval = nlm_read_sys_reg(sysbase, SYS_POWER_ON_RESET_CFG);
-        dfsval = nlm_read_sys_reg(sysbase, SYS_CORE_DFS_DIV_VALUE);
-        pll_divf = ((rstval >> 10) & 0x7f) + 1;
-        pll_divr = ((rstval >> 8)  & 0x3) + 1;
-        ext_div  = ((rstval >> 30) & 0x3) + 1;
-        dfs_div  = ((dfsval >> (core * 4)) & 0xf) + 1;
-
-        num = 800000000ULL * pll_divf;
-        denom = 3 * pll_divr * ext_div * dfs_div;
+        if (cpu_is_xlpii()) {
+                num = 1000000ULL * (400 * 3 + 100 * (rstval >> 26));
+                denom = 3;
+        } else {
+                dfsval = nlm_read_sys_reg(sysbase, SYS_CORE_DFS_DIV_VALUE);
+                pll_divf = ((rstval >> 10) & 0x7f) + 1;
+                pll_divr = ((rstval >> 8)  & 0x3) + 1;
+                ext_div  = ((rstval >> 30) & 0x3) + 1;
+                dfs_div  = ((dfsval >> (core * 4)) & 0xf) + 1;
+
+                num = 800000000ULL * pll_divf;
+                denom = 3 * pll_divr * ext_div * dfs_div;
+        }
         do_div(num, denom);
         return (unsigned int)num;
 }
 
+/* Calculate Frequency to the PIC from PLL.
+ * freq_out = ( ref_freq/2 * (6 + ctrl2[7:0]) + ctrl2[20:8]/2^13 ) /
+ * ((2^ctrl0[7:5]) * Table(ctrl0[26:24]))
+ */
+static unsigned int nlm_2xx_get_pic_frequency(int node)
+{
+        u32 ctrl_val0, ctrl_val2, vco_post_div, pll_post_div;
+        u32 mdiv, fdiv, pll_out_freq_den, reg_select, ref_div, pic_div;
+        u64 ref_clk, sysbase, pll_out_freq_num, ref_clk_select;
+
+        sysbase = nlm_get_node(node)->sysbase;
+
+        /* Find ref_clk_base */
+        ref_clk_select =
+                (nlm_read_sys_reg(sysbase, SYS_POWER_ON_RESET_CFG) >> 18) & 0x3;
+        switch (ref_clk_select) {
+        case 0:
+                ref_clk = 200000000ULL;
+                ref_div = 3;
+                break;
+        case 1:
+                ref_clk = 100000000ULL;
+                ref_div = 1;
+                break;
+        case 2:
+                ref_clk = 125000000ULL;
+                ref_div = 1;
+                break;
+        case 3:
+                ref_clk = 400000000ULL;
+                ref_div = 3;
+                break;
+        }
+
+        /* Find the clock source PLL device for PIC */
+        reg_select = (nlm_read_sys_reg(sysbase, SYS_CLK_DEV_SEL) >> 22) & 0x3;
+        switch (reg_select) {
+        case 0:
+                ctrl_val0 = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL0);
+                ctrl_val2 = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL2);
+                break;
+        case 1:
+                ctrl_val0 = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL0_DEVX(0));
+                ctrl_val2 = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL2_DEVX(0));
+                break;
+        case 2:
+                ctrl_val0 = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL0_DEVX(1));
+                ctrl_val2 = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL2_DEVX(1));
+                break;
+        case 3:
+                ctrl_val0 = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL0_DEVX(2));
+                ctrl_val2 = nlm_read_sys_reg(sysbase, SYS_PLL_CTRL2_DEVX(2));
+                break;
+        }
+
+        vco_post_div = (ctrl_val0 >> 5) & 0x7;
+        pll_post_div = (ctrl_val0 >> 24) & 0x7;
+        mdiv = ctrl_val2 & 0xff;
+        fdiv = (ctrl_val2 >> 8) & 0xfff;
+
+        /* Find PLL post divider value */
+        switch (pll_post_div) {
+        case 1:
+                pll_post_div = 2;
+                break;
+        case 3:
+                pll_post_div = 4;
+                break;
+        case 7:
+                pll_post_div = 8;
+                break;
+        case 6:
+                pll_post_div = 16;
+                break;
+        case 0:
+        default:
+                pll_post_div = 1;
+                break;
+        }
+
+        fdiv = fdiv/(1 << 13);
+        pll_out_freq_num = ((ref_clk >> 1) * (6 + mdiv)) + fdiv;
+        pll_out_freq_den = (1 << vco_post_div) * pll_post_div * 3;
+
+        if (pll_out_freq_den > 0)
+                do_div(pll_out_freq_num, pll_out_freq_den);
+
+        /* PIC post divider, which happens after PLL */
+        pic_div = (nlm_read_sys_reg(sysbase, SYS_CLK_DEV_DIV) >> 22) & 0x3;
+        do_div(pll_out_freq_num, 1 << pic_div);
+
+        return pll_out_freq_num;
+}
+
+unsigned int nlm_get_pic_frequency(int node)
+{
+        if (cpu_is_xlpii())
+                return nlm_2xx_get_pic_frequency(node);
+        else
+                return 133333333;
+}
+
 unsigned int nlm_get_cpu_frequency(void)
 {
         return nlm_get_core_frequency(0, 0);