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Diffstat (limited to 'drivers/timer/ae3xx_timer.c')
-rw-r--r--drivers/timer/ae3xx_timer.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/drivers/timer/ae3xx_timer.c b/drivers/timer/ae3xx_timer.c
new file mode 100644
index 0000000..7ccb3eb
--- /dev/null
+++ b/drivers/timer/ae3xx_timer.c
@@ -0,0 +1,117 @@
+/*
+ * Andestech ATCPIT100 timer driver
+ *
+ * (C) Copyright 2016
+ * Rick Chen, NDS32 Software Engineering, rick@andestech.com
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <timer.h>
+#include <linux/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define REG32_TMR(x) (*(unsigned long *) ((plat->regs) + (x>>2)))
+
+/*
+ * Definition of register offsets
+ */
+
+/* ID and Revision Register */
+#define ID_REV 0x0
+
+/* Configuration Register */
+#define CFG 0x10
+
+/* Interrupt Enable Register */
+#define INT_EN 0x14
+#define CH_INT_EN(c , i) ((1<<i)<<(4*c))
+
+/* Interrupt Status Register */
+#define INT_STA 0x18
+#define CH_INT_STA(c , i) ((1<<i)<<(4*c))
+
+/* Channel Enable Register */
+#define CH_EN 0x1C
+#define CH_TMR_EN(c , t) ((1<<t)<<(4*c))
+
+/* Ch n Control REgister */
+#define CH_CTL(n) (0x20+0x10*n)
+/* Channel clock source , bit 3 , 0:External clock , 1:APB clock */
+#define APB_CLK (1<<3)
+/* Channel mode , bit 0~2 */
+#define TMR_32 1
+#define TMR_16 2
+#define TMR_8 3
+#define PWM 4
+
+#define CH_REL(n) (0x24+0x10*n)
+#define CH_CNT(n) (0x28+0x10*n)
+
+struct atctmr_timer_regs {
+ u32 id_rev; /* 0x00 */
+ u32 reservd[3]; /* 0x04 ~ 0x0c */
+ u32 cfg; /* 0x10 */
+ u32 int_en; /* 0x14 */
+ u32 int_st; /* 0x18 */
+ u32 ch_en; /* 0x1c */
+ u32 ch0_ctrl; /* 0x20 */
+ u32 ch0_reload; /* 0x24 */
+ u32 ch0_cntr; /* 0x28 */
+ u32 reservd1; /* 0x2c */
+ u32 ch1_ctrl; /* 0x30 */
+ u32 ch1_reload; /* 0x34 */
+ u32 int_mask; /* 0x38 */
+};
+
+struct atftmr_timer_platdata {
+ unsigned long *regs;
+};
+
+static int atftmr_timer_get_count(struct udevice *dev, u64 *count)
+{
+ struct atftmr_timer_platdata *plat = dev->platdata;
+ u32 val;
+ val = ~(REG32_TMR(CH_CNT(1))+0xffffffff);
+ *count = timer_conv_64(val);
+ return 0;
+}
+
+static int atctmr_timer_probe(struct udevice *dev)
+{
+ struct atftmr_timer_platdata *plat = dev->platdata;
+ REG32_TMR(CH_REL(1)) = 0xffffffff;
+ REG32_TMR(CH_CTL(1)) = APB_CLK|TMR_32;
+ REG32_TMR(CH_EN) |= CH_TMR_EN(1 , 0);
+ return 0;
+}
+
+static int atctme_timer_ofdata_to_platdata(struct udevice *dev)
+{
+ struct atftmr_timer_platdata *plat = dev_get_platdata(dev);
+ plat->regs = map_physmem(dev_get_addr(dev) , 0x100 , MAP_NOCACHE);
+ return 0;
+}
+
+static const struct timer_ops ag101p_timer_ops = {
+ .get_count = atftmr_timer_get_count,
+};
+
+static const struct udevice_id ag101p_timer_ids[] = {
+ { .compatible = "andestech,atcpit100" },
+ {}
+};
+
+U_BOOT_DRIVER(altera_timer) = {
+ .name = "ae3xx_timer",
+ .id = UCLASS_TIMER,
+ .of_match = ag101p_timer_ids,
+ .ofdata_to_platdata = atctme_timer_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct atftmr_timer_platdata),
+ .probe = atctmr_timer_probe,
+ .ops = &ag101p_timer_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+};