Merge pull request #3695 from imgtec/bsp-ls2k/clk-up-v1

bsp: ls2k: initial clk driver

bsp/ls2kdev/drivers/clk.c

+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-09-06     勤为本       first version
+ *
+ * Copyright (c) 2020, duhuanpeng<548708880@qq.com>
+ * legacy driver APIs from loongson 1C BSP.
+ */
+
+#include <rtthread.h>
+#include "ls2k1000.h"
+
+
+struct loongson_pll {
+    rt_uint64_t PLL_SYS_0;
+    rt_uint64_t PLL_SYS_1;
+    rt_uint64_t PLL_DDR_0;
+    rt_uint64_t PLL_DDR_1;
+    rt_uint64_t PLL_DC_0;
+    rt_uint64_t PLL_DC_1;
+    rt_uint64_t PLL_PIX0_0;
+    rt_uint64_t PLL_PIX0_1;
+    rt_uint64_t PLL_PIX1_0;
+    rt_uint64_t PLL_PIX1_1;
+    rt_uint64_t FREQSCALE;
+};
+
+/* See the Schematic */
+#define SYS_CLKSEL1 1
+#define SYS_CLKSEL0 0
+
+/* bit field helpers. */
+#define __M(n)               (~(~0<<(n)))
+#define __RBF(number, n)     ((number)&__M(n))
+#define __BF(number, n, m)   __RBF((number>>m), (n-m+1))
+#define BF(number, n, m)     (m<n ? __BF(number, n, m) : __BF(number, m, n))
+
+int refclk = 100;
+int gmac_clock = 125;
+
+volatile struct loongson_pll *pll = (void *)PLL_SYS_BASE;
+
+
+unsigned long clk_get_pll_rate(void)
+{
+    return -RT_ENOSYS;
+
+}
+
+unsigned long clk_get_cpu_rate(void)
+{
+    unsigned long node_clock;
+    int l1_div_ref;
+    int l1_div_loopc;
+    int l2_div_out_node;
+
+    l1_div_ref      = BF(pll->PLL_SYS_0, 26, 31);
+    l1_div_loopc    = BF(pll->PLL_SYS_0, 32, 41);
+    l2_div_out_node = BF(pll->PLL_SYS_1,  5,  0);
+
+    node_clock = refclk / l1_div_ref * l1_div_loopc / l2_div_out_node;
+    return node_clock;
+}
+
+unsigned long clk_get_ddr_rate(void)
+{
+    unsigned long ddr_clock;
+    int l1_div_ref;
+    int l1_div_loopc;
+    int l2_div_out_ddr;
+
+    l1_div_ref     = BF(pll->PLL_DDR_0, 26, 31);
+    l1_div_loopc   = BF(pll->PLL_DDR_0, 32, 41);
+    l2_div_out_ddr = BF(pll->PLL_DDR_1, 0, 5);
+
+    ddr_clock = refclk / l1_div_ref * l1_div_loopc / l2_div_out_ddr;
+    return ddr_clock;
+}
+
+unsigned long clk_get_apb_rate(void)
+{
+    unsigned long apb_clock;
+    int apb_freqscale;
+
+    apb_freqscale = BF(pll->FREQSCALE, 22, 20);
+
+    /* gmac clock is fixed 125MHz */
+    apb_clock = gmac_clock * (apb_freqscale + 1) / 8;
+    return apb_clock;
+
+}
+
+unsigned long clk_get_dc_rate(void)
+{
+    return -RT_ENOSYS;
+}

bsp/ls2kdev/drivers/clk.h

+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2017-09-06     勤为本       first version
+ *
+ * Copyright (c) 2020, Du Huanpeng <548708880@qq.com>
+ * base on bsp/ls1cdev/libraries/ls1c_clock.h
+ */
+
+#ifndef __LOONGSON_CLK_H__
+#define __LOONGSON_CLK_H__
+
+unsigned long clk_get_pll_rate(void);
+unsigned long clk_get_cpu_rate(void);
+unsigned long clk_get_ddr_rate(void);
+unsigned long clk_get_apb_rate(void);
+unsigned long clk_get_dc_rate(void);
+
+#endif

bsp/ls2kdev/drivers/ls2k1000.h

@@ -8,6 +8,7 @@
 #define UART0_BASE CKSEG1ADDR(UART0_BASE_ADDR + UART0_OFF)
 
 #define GPIO_BASE 0xFFFFFFFFBFE10500
+#define PLL_SYS_BASE 0xFFFFFFFFBFE10480
 
 void rt_hw_timer_handler(void);
 void rt_hw_uart_init(void);