Required properties:
- #clock-cells : Must be 1
- compatible : "xlnx,ps7-clkc"
+ - reg : SLCR offset and size taken via syscon < 0x100 0x100 >
- ps-clk-frequency : Frequency of the oscillator providing ps_clk in HZ
(usually 33 MHz oscillators are used for Zynq platforms)
- clock-output-names : List of strings used to name the clock outputs. Shall be
47: dbg_apb
Example:
- clkc: clkc {
+ clkc: clkc@100 {
#clock-cells = <1>;
compatible = "xlnx,ps7-clkc";
ps-clk-frequency = <33333333>;
+ reg = <0x100 0x100>;
clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x",
"cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x",
"dci", "lqspi", "smc", "pcap", "gem0", "gem1",
} ;
slcr: slcr@f8000000 {
- compatible = "xlnx,zynq-slcr";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ compatible = "xlnx,zynq-slcr", "syscon";
reg = <0xF8000000 0x1000>;
-
- clocks {
- #address-cells = <1>;
- #size-cells = <0>;
-
- clkc: clkc {
- #clock-cells = <1>;
- compatible = "xlnx,ps7-clkc";
- ps-clk-frequency = <33333333>;
- clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x",
- "cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x",
- "dci", "lqspi", "smc", "pcap", "gem0", "gem1",
- "fclk0", "fclk1", "fclk2", "fclk3", "can0", "can1",
- "sdio0", "sdio1", "uart0", "uart1", "spi0", "spi1",
- "dma", "usb0_aper", "usb1_aper", "gem0_aper",
- "gem1_aper", "sdio0_aper", "sdio1_aper",
- "spi0_aper", "spi1_aper", "can0_aper", "can1_aper",
- "i2c0_aper", "i2c1_aper", "uart0_aper", "uart1_aper",
- "gpio_aper", "lqspi_aper", "smc_aper", "swdt",
- "dbg_trc", "dbg_apb";
- };
+ ranges;
+ clkc: clkc@100 {
+ #clock-cells = <1>;
+ compatible = "xlnx,ps7-clkc";
+ ps-clk-frequency = <33333333>;
+ fclk-enable = <0>;
+ clock-output-names = "armpll", "ddrpll", "iopll", "cpu_6or4x",
+ "cpu_3or2x", "cpu_2x", "cpu_1x", "ddr2x", "ddr3x",
+ "dci", "lqspi", "smc", "pcap", "gem0", "gem1",
+ "fclk0", "fclk1", "fclk2", "fclk3", "can0", "can1",
+ "sdio0", "sdio1", "uart0", "uart1", "spi0", "spi1",
+ "dma", "usb0_aper", "usb1_aper", "gem0_aper",
+ "gem1_aper", "sdio0_aper", "sdio1_aper",
+ "spi0_aper", "spi1_aper", "can0_aper", "can1_aper",
+ "i2c0_aper", "i2c1_aper", "uart0_aper", "uart1_aper",
+ "gpio_aper", "lqspi_aper", "smc_aper", "swdt",
+ "dbg_trc", "dbg_apb";
+ reg = <0x100 0x100>;
};
};
.endm
.macro waituart,rd,rx
+1001: ldr \rd, [\rx, #UART_SR_OFFSET]
+ tst \rd, #UART_SR_TXEMPTY
+ beq 1001b
.endm
.macro busyuart,rd,rx
select SPARSE_IRQ
select CADENCE_TTC_TIMER
select ARM_GLOBAL_TIMER
+ select MFD_SYSCON
help
Support for Xilinx Zynq ARM Cortex A9 Platform
#include <linux/cpumask.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
+#include <linux/clk-provider.h>
#include <linux/clk/zynq.h>
#include <linux/clocksource.h>
#include <linux/of_address.h>
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
platform_device_register(&zynq_cpuidle_device);
+
+ zynq_slcr_init();
}
static void __init zynq_timer_init(void)
{
- zynq_slcr_init();
+ zynq_early_slcr_init();
+
+ zynq_clock_init();
+ of_clk_init(NULL);
clocksource_of_init();
}
void zynq_secondary_startup(void);
extern int zynq_slcr_init(void);
+extern int zynq_early_slcr_init(void);
extern void zynq_slcr_system_reset(void);
extern void zynq_slcr_cpu_stop(int cpu);
extern void zynq_slcr_cpu_start(int cpu);
extern struct smp_operations zynq_smp_ops __initdata;
#endif
-extern void __iomem *zynq_slcr_base;
extern void __iomem *zynq_scu_base;
/* Hotplug */
*/
#include <linux/io.h>
+#include <linux/mfd/syscon.h>
#include <linux/of_address.h>
+#include <linux/regmap.h>
#include <linux/clk/zynq.h>
#include "common.h"
#define SLCR_A9_CPU_CLKSTOP 0x10
#define SLCR_A9_CPU_RST 0x1
-void __iomem *zynq_slcr_base;
+static void __iomem *zynq_slcr_base;
+static struct regmap *zynq_slcr_regmap;
+
+/**
+ * zynq_slcr_write - Write to a register in SLCR block
+ *
+ * @val: Value to write to the register
+ * @offset: Register offset in SLCR block
+ *
+ * Return: a negative value on error, 0 on success
+ */
+static int zynq_slcr_write(u32 val, u32 offset)
+{
+ if (!zynq_slcr_regmap) {
+ writel(val, zynq_slcr_base + offset);
+ return 0;
+ }
+
+ return regmap_write(zynq_slcr_regmap, offset, val);
+}
+
+/**
+ * zynq_slcr_read - Read a register in SLCR block
+ *
+ * @val: Pointer to value to be read from SLCR
+ * @offset: Register offset in SLCR block
+ *
+ * Return: a negative value on error, 0 on success
+ */
+static int zynq_slcr_read(u32 *val, u32 offset)
+{
+ if (zynq_slcr_regmap)
+ return regmap_read(zynq_slcr_regmap, offset, val);
+
+ *val = readl(zynq_slcr_base + offset);
+
+ return 0;
+}
+
+/**
+ * zynq_slcr_unlock - Unlock SLCR registers
+ *
+ * Return: a negative value on error, 0 on success
+ */
+static inline int zynq_slcr_unlock(void)
+{
+ zynq_slcr_write(SLCR_UNLOCK_MAGIC, SLCR_UNLOCK_OFFSET);
+
+ return 0;
+}
/**
* zynq_slcr_system_reset - Reset the entire system.
* Note that this seems to require raw i/o
* functions or there's a lockup?
*/
- writel(SLCR_UNLOCK_MAGIC, zynq_slcr_base + SLCR_UNLOCK_OFFSET);
+ zynq_slcr_unlock();
/*
* Clear 0x0F000000 bits of reboot status register to workaround
* the FSBL not loading the bitstream after soft-reboot
* This is a temporary solution until we know more.
*/
- reboot = readl(zynq_slcr_base + SLCR_REBOOT_STATUS_OFFSET);
- writel(reboot & 0xF0FFFFFF, zynq_slcr_base + SLCR_REBOOT_STATUS_OFFSET);
- writel(1, zynq_slcr_base + SLCR_PS_RST_CTRL_OFFSET);
+ zynq_slcr_read(&reboot, SLCR_REBOOT_STATUS_OFFSET);
+ zynq_slcr_write(reboot & 0xF0FFFFFF, SLCR_REBOOT_STATUS_OFFSET);
+ zynq_slcr_write(1, SLCR_PS_RST_CTRL_OFFSET);
}
/**
*/
void zynq_slcr_cpu_start(int cpu)
{
- u32 reg = readl(zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+ u32 reg;
+
+ zynq_slcr_read(®, SLCR_A9_CPU_RST_CTRL_OFFSET);
reg &= ~(SLCR_A9_CPU_RST << cpu);
- writel(reg, zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+ zynq_slcr_write(reg, SLCR_A9_CPU_RST_CTRL_OFFSET);
reg &= ~(SLCR_A9_CPU_CLKSTOP << cpu);
- writel(reg, zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+ zynq_slcr_write(reg, SLCR_A9_CPU_RST_CTRL_OFFSET);
}
/**
*/
void zynq_slcr_cpu_stop(int cpu)
{
- u32 reg = readl(zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+ u32 reg;
+
+ zynq_slcr_read(®, SLCR_A9_CPU_RST_CTRL_OFFSET);
reg |= (SLCR_A9_CPU_CLKSTOP | SLCR_A9_CPU_RST) << cpu;
- writel(reg, zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+ zynq_slcr_write(reg, SLCR_A9_CPU_RST_CTRL_OFFSET);
}
/**
- * zynq_slcr_init
- * Returns 0 on success, negative errno otherwise.
+ * zynq_slcr_init - Regular slcr driver init
+ *
+ * Return: 0 on success, negative errno otherwise.
*
* Called early during boot from platform code to remap SLCR area.
*/
int __init zynq_slcr_init(void)
+{
+ zynq_slcr_regmap = syscon_regmap_lookup_by_compatible("xlnx,zynq-slcr");
+ if (IS_ERR(zynq_slcr_regmap)) {
+ pr_err("%s: failed to find zynq-slcr\n", __func__);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/**
+ * zynq_early_slcr_init - Early slcr init function
+ *
+ * Return: 0 on success, negative errno otherwise.
+ *
+ * Called very early during boot from platform code to unlock SLCR.
+ */
+int __init zynq_early_slcr_init(void)
{
struct device_node *np;
BUG();
}
+ np->data = (__force void *)zynq_slcr_base;
+
/* unlock the SLCR so that registers can be changed */
- writel(SLCR_UNLOCK_MAGIC, zynq_slcr_base + SLCR_UNLOCK_OFFSET);
+ zynq_slcr_unlock();
pr_info("%s mapped to %p\n", np->name, zynq_slcr_base);
- zynq_clock_init(zynq_slcr_base);
-
of_node_put(np);
return 0;
#include <linux/clk/zynq.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
+#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/io.h>
-static void __iomem *zynq_slcr_base_priv;
-
-#define SLCR_ARMPLL_CTRL (zynq_slcr_base_priv + 0x100)
-#define SLCR_DDRPLL_CTRL (zynq_slcr_base_priv + 0x104)
-#define SLCR_IOPLL_CTRL (zynq_slcr_base_priv + 0x108)
-#define SLCR_PLL_STATUS (zynq_slcr_base_priv + 0x10c)
-#define SLCR_ARM_CLK_CTRL (zynq_slcr_base_priv + 0x120)
-#define SLCR_DDR_CLK_CTRL (zynq_slcr_base_priv + 0x124)
-#define SLCR_DCI_CLK_CTRL (zynq_slcr_base_priv + 0x128)
-#define SLCR_APER_CLK_CTRL (zynq_slcr_base_priv + 0x12c)
-#define SLCR_GEM0_CLK_CTRL (zynq_slcr_base_priv + 0x140)
-#define SLCR_GEM1_CLK_CTRL (zynq_slcr_base_priv + 0x144)
-#define SLCR_SMC_CLK_CTRL (zynq_slcr_base_priv + 0x148)
-#define SLCR_LQSPI_CLK_CTRL (zynq_slcr_base_priv + 0x14c)
-#define SLCR_SDIO_CLK_CTRL (zynq_slcr_base_priv + 0x150)
-#define SLCR_UART_CLK_CTRL (zynq_slcr_base_priv + 0x154)
-#define SLCR_SPI_CLK_CTRL (zynq_slcr_base_priv + 0x158)
-#define SLCR_CAN_CLK_CTRL (zynq_slcr_base_priv + 0x15c)
-#define SLCR_CAN_MIOCLK_CTRL (zynq_slcr_base_priv + 0x160)
-#define SLCR_DBG_CLK_CTRL (zynq_slcr_base_priv + 0x164)
-#define SLCR_PCAP_CLK_CTRL (zynq_slcr_base_priv + 0x168)
-#define SLCR_FPGA0_CLK_CTRL (zynq_slcr_base_priv + 0x170)
-#define SLCR_621_TRUE (zynq_slcr_base_priv + 0x1c4)
-#define SLCR_SWDT_CLK_SEL (zynq_slcr_base_priv + 0x304)
+static void __iomem *zynq_clkc_base;
+
+#define SLCR_ARMPLL_CTRL (zynq_clkc_base + 0x00)
+#define SLCR_DDRPLL_CTRL (zynq_clkc_base + 0x04)
+#define SLCR_IOPLL_CTRL (zynq_clkc_base + 0x08)
+#define SLCR_PLL_STATUS (zynq_clkc_base + 0x0c)
+#define SLCR_ARM_CLK_CTRL (zynq_clkc_base + 0x20)
+#define SLCR_DDR_CLK_CTRL (zynq_clkc_base + 0x24)
+#define SLCR_DCI_CLK_CTRL (zynq_clkc_base + 0x28)
+#define SLCR_APER_CLK_CTRL (zynq_clkc_base + 0x2c)
+#define SLCR_GEM0_CLK_CTRL (zynq_clkc_base + 0x40)
+#define SLCR_GEM1_CLK_CTRL (zynq_clkc_base + 0x44)
+#define SLCR_SMC_CLK_CTRL (zynq_clkc_base + 0x48)
+#define SLCR_LQSPI_CLK_CTRL (zynq_clkc_base + 0x4c)
+#define SLCR_SDIO_CLK_CTRL (zynq_clkc_base + 0x50)
+#define SLCR_UART_CLK_CTRL (zynq_clkc_base + 0x54)
+#define SLCR_SPI_CLK_CTRL (zynq_clkc_base + 0x58)
+#define SLCR_CAN_CLK_CTRL (zynq_clkc_base + 0x5c)
+#define SLCR_CAN_MIOCLK_CTRL (zynq_clkc_base + 0x60)
+#define SLCR_DBG_CLK_CTRL (zynq_clkc_base + 0x64)
+#define SLCR_PCAP_CLK_CTRL (zynq_clkc_base + 0x68)
+#define SLCR_FPGA0_CLK_CTRL (zynq_clkc_base + 0x70)
+#define SLCR_621_TRUE (zynq_clkc_base + 0xc4)
+#define SLCR_SWDT_CLK_SEL (zynq_clkc_base + 0x204)
#define NUM_MIO_PINS 54
CLK_OF_DECLARE(zynq_clkc, "xlnx,ps7-clkc", zynq_clk_setup);
-void __init zynq_clock_init(void __iomem *slcr_base)
+void __init zynq_clock_init(void)
{
- zynq_slcr_base_priv = slcr_base;
- of_clk_init(NULL);
+ struct device_node *np;
+ struct device_node *slcr;
+ struct resource res;
+
+ np = of_find_compatible_node(NULL, NULL, "xlnx,ps7-clkc");
+ if (!np) {
+ pr_err("%s: clkc node not found\n", __func__);
+ goto np_err;
+ }
+
+ if (of_address_to_resource(np, 0, &res)) {
+ pr_err("%s: failed to get resource\n", np->name);
+ goto np_err;
+ }
+
+ slcr = of_get_parent(np);
+
+ if (slcr->data) {
+ zynq_clkc_base = (__force void __iomem *)slcr->data + res.start;
+ } else {
+ pr_err("%s: Unable to get I/O memory\n", np->name);
+ of_node_put(slcr);
+ goto np_err;
+ }
+
+ pr_info("%s: clkc starts at %p\n", __func__, zynq_clkc_base);
+
+ of_node_put(slcr);
+ of_node_put(np);
+
+ return;
+
+np_err:
+ of_node_put(np);
+ BUG();
+ return;
}
#include <linux/spinlock.h>
-void zynq_clock_init(void __iomem *slcr);
+void zynq_clock_init(void);
struct clk *clk_register_zynq_pll(const char *name, const char *parent,
void __iomem *pll_ctrl, void __iomem *pll_status, u8 lock_index,
projects / karo-tx-linux.git / commitdiff