drivers/clk/spear/spear6xx_clock.c
Source file repositories/reference/linux-study-clean/drivers/clk/spear/spear6xx_clock.c
File Facts
- System
- Linux kernel
- Corpus path
drivers/clk/spear/spear6xx_clock.c- Extension
.c- Size
- 12288 bytes
- Lines
- 339
- Domain
- Driver Families
- Bucket
- drivers/clk
- Inferred role
- Driver Families: implementation source
- Status
- source implementation candidate
Why This File Exists
Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/clkdev.hlinux/clk/spear.hlinux/io.hlinux/spinlock_types.hclk.h
Detected Declarations
function spear6xx_clk_init
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0-only
/*
* SPEAr6xx machines clock framework source file
*
* Copyright (C) 2012 ST Microelectronics
* Viresh Kumar <vireshk@kernel.org>
*/
#include <linux/clkdev.h>
#include <linux/clk/spear.h>
#include <linux/io.h>
#include <linux/spinlock_types.h>
#include "clk.h"
static DEFINE_SPINLOCK(_lock);
#define PLL1_CTR (misc_base + 0x008)
#define PLL1_FRQ (misc_base + 0x00C)
#define PLL2_CTR (misc_base + 0x014)
#define PLL2_FRQ (misc_base + 0x018)
#define PLL_CLK_CFG (misc_base + 0x020)
/* PLL_CLK_CFG register masks */
#define MCTR_CLK_SHIFT 28
#define MCTR_CLK_MASK 3
#define CORE_CLK_CFG (misc_base + 0x024)
/* CORE CLK CFG register masks */
#define HCLK_RATIO_SHIFT 10
#define HCLK_RATIO_MASK 2
#define PCLK_RATIO_SHIFT 8
#define PCLK_RATIO_MASK 2
#define PERIP_CLK_CFG (misc_base + 0x028)
/* PERIP_CLK_CFG register masks */
#define CLCD_CLK_SHIFT 2
#define CLCD_CLK_MASK 2
#define UART_CLK_SHIFT 4
#define UART_CLK_MASK 1
#define FIRDA_CLK_SHIFT 5
#define FIRDA_CLK_MASK 2
#define GPT0_CLK_SHIFT 8
#define GPT1_CLK_SHIFT 10
#define GPT2_CLK_SHIFT 11
#define GPT3_CLK_SHIFT 12
#define GPT_CLK_MASK 1
#define PERIP1_CLK_ENB (misc_base + 0x02C)
/* PERIP1_CLK_ENB register masks */
#define UART0_CLK_ENB 3
#define UART1_CLK_ENB 4
#define SSP0_CLK_ENB 5
#define SSP1_CLK_ENB 6
#define I2C_CLK_ENB 7
#define JPEG_CLK_ENB 8
#define FSMC_CLK_ENB 9
#define FIRDA_CLK_ENB 10
#define GPT2_CLK_ENB 11
#define GPT3_CLK_ENB 12
#define GPIO2_CLK_ENB 13
#define SSP2_CLK_ENB 14
#define ADC_CLK_ENB 15
#define GPT1_CLK_ENB 11
#define RTC_CLK_ENB 17
#define GPIO1_CLK_ENB 18
#define DMA_CLK_ENB 19
#define SMI_CLK_ENB 21
#define CLCD_CLK_ENB 22
#define GMAC_CLK_ENB 23
#define USBD_CLK_ENB 24
#define USBH0_CLK_ENB 25
#define USBH1_CLK_ENB 26
#define PRSC0_CLK_CFG (misc_base + 0x044)
#define PRSC1_CLK_CFG (misc_base + 0x048)
#define PRSC2_CLK_CFG (misc_base + 0x04C)
#define CLCD_CLK_SYNT (misc_base + 0x05C)
#define FIRDA_CLK_SYNT (misc_base + 0x060)
#define UART_CLK_SYNT (misc_base + 0x064)
/* vco rate configuration table, in ascending order of rates */
static struct pll_rate_tbl pll_rtbl[] = {
{.mode = 0, .m = 0x53, .n = 0x0F, .p = 0x1}, /* vco 332 & pll 166 MHz */
{.mode = 0, .m = 0x85, .n = 0x0F, .p = 0x1}, /* vco 532 & pll 266 MHz */
{.mode = 0, .m = 0xA6, .n = 0x0F, .p = 0x1}, /* vco 664 & pll 332 MHz */
};
/* aux rate configuration table, in ascending order of rates */
static struct aux_rate_tbl aux_rtbl[] = {
/* For PLL1 = 332 MHz */
Annotation
- Immediate include surface: `linux/clkdev.h`, `linux/clk/spear.h`, `linux/io.h`, `linux/spinlock_types.h`, `clk.h`.
- Detected declarations: `function spear6xx_clk_init`.
- Atlas domain: Driver Families / drivers/clk.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.