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linux-next/drivers/clk/nxp/clk-lpc32xx.c
Vladimir Zapolskiy f7c82a60ba clk: lpc32xx: add common clock framework driver 
Add support for all configurable clocks found on NXP LPC32xx SoC.

The list contains several heterogenous groups of clocks:
* system clocks including multiple dividers and muxes,
* x397 PLL, HCLK PLL and USB PLL,
* peripheral clocks inherited from rtc, hclk and pclk,
* USB controller clocks: AHB slave, I2C, OTG, OHCI and device.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
2015-12-24 12:31:26 -08:00

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/*
* Copyright 2015 Vladimir Zapolskiy <vz@mleia.com>
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <dt-bindings/clock/lpc32xx-clock.h>
#undef pr_fmt
#define pr_fmt(fmt) "%s: " fmt, __func__
/* Common bitfield definitions for x397 PLL (lock), USB PLL and HCLK PLL */
#define PLL_CTRL_ENABLE BIT(16)
#define PLL_CTRL_BYPASS BIT(15)
#define PLL_CTRL_DIRECT BIT(14)
#define PLL_CTRL_FEEDBACK BIT(13)
#define PLL_CTRL_POSTDIV (BIT(12)|BIT(11))
#define PLL_CTRL_PREDIV (BIT(10)|BIT(9))
#define PLL_CTRL_FEEDDIV (0xFF << 1)
#define PLL_CTRL_LOCK BIT(0)
/* Clock registers on System Control Block */
#define LPC32XX_CLKPWR_DEBUG_CTRL 0x00
#define LPC32XX_CLKPWR_USB_DIV 0x1C
#define LPC32XX_CLKPWR_HCLKDIV_CTRL 0x40
#define LPC32XX_CLKPWR_PWR_CTRL 0x44
#define LPC32XX_CLKPWR_PLL397_CTRL 0x48
#define LPC32XX_CLKPWR_OSC_CTRL 0x4C
#define LPC32XX_CLKPWR_SYSCLK_CTRL 0x50
#define LPC32XX_CLKPWR_LCDCLK_CTRL 0x54
#define LPC32XX_CLKPWR_HCLKPLL_CTRL 0x58
#define LPC32XX_CLKPWR_ADCCLK_CTRL1 0x60
#define LPC32XX_CLKPWR_USB_CTRL 0x64
#define LPC32XX_CLKPWR_SSP_CTRL 0x78
#define LPC32XX_CLKPWR_I2S_CTRL 0x7C
#define LPC32XX_CLKPWR_MS_CTRL 0x80
#define LPC32XX_CLKPWR_MACCLK_CTRL 0x90
#define LPC32XX_CLKPWR_TEST_CLK_CTRL 0xA4
#define LPC32XX_CLKPWR_I2CCLK_CTRL 0xAC
#define LPC32XX_CLKPWR_KEYCLK_CTRL 0xB0
#define LPC32XX_CLKPWR_ADCCLK_CTRL 0xB4
#define LPC32XX_CLKPWR_PWMCLK_CTRL 0xB8
#define LPC32XX_CLKPWR_TIMCLK_CTRL 0xBC
#define LPC32XX_CLKPWR_TIMCLK_CTRL1 0xC0
#define LPC32XX_CLKPWR_SPI_CTRL 0xC4
#define LPC32XX_CLKPWR_FLASHCLK_CTRL 0xC8
#define LPC32XX_CLKPWR_UART3_CLK_CTRL 0xD0
#define LPC32XX_CLKPWR_UART4_CLK_CTRL 0xD4
#define LPC32XX_CLKPWR_UART5_CLK_CTRL 0xD8
#define LPC32XX_CLKPWR_UART6_CLK_CTRL 0xDC
#define LPC32XX_CLKPWR_IRDA_CLK_CTRL 0xE0
#define LPC32XX_CLKPWR_UART_CLK_CTRL 0xE4
#define LPC32XX_CLKPWR_DMA_CLK_CTRL 0xE8
/* Clock registers on USB controller */
#define LPC32XX_USB_CLK_CTRL 0xF4
#define LPC32XX_USB_CLK_STS 0xF8
static struct regmap_config lpc32xx_scb_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
.max_register = 0x114,
.fast_io = true,
};
static struct regmap *clk_regmap;
static void __iomem *usb_clk_vbase;
enum {
LPC32XX_USB_CLK_OTG = LPC32XX_USB_CLK_HOST + 1,
LPC32XX_USB_CLK_AHB,
LPC32XX_USB_CLK_MAX = LPC32XX_USB_CLK_AHB + 1,
};
enum {
/* Start from the last defined clock in dt bindings */
LPC32XX_CLK_ADC_DIV = LPC32XX_CLK_ADC + 1,
LPC32XX_CLK_ADC_RTC,
LPC32XX_CLK_TEST1,
LPC32XX_CLK_TEST2,
/* System clocks, PLL 397x and HCLK PLL clocks */
LPC32XX_CLK_OSC,
LPC32XX_CLK_SYS,
LPC32XX_CLK_PLL397X,
LPC32XX_CLK_HCLK_PLL,
LPC32XX_CLK_HCLK_DIV_PERIPH,
LPC32XX_CLK_HCLK_DIV,
LPC32XX_CLK_HCLK,
LPC32XX_CLK_PERIPH,
LPC32XX_CLK_ARM,
LPC32XX_CLK_ARM_VFP,
/* USB clocks */
LPC32XX_CLK_USB_PLL,
LPC32XX_CLK_USB_DIV,
LPC32XX_CLK_USB,
/* Only one control PWR_CTRL[10] for both muxes */
LPC32XX_CLK_PERIPH_HCLK_MUX,
LPC32XX_CLK_PERIPH_ARM_MUX,
/* Only one control PWR_CTRL[2] for all three muxes */
LPC32XX_CLK_SYSCLK_PERIPH_MUX,
LPC32XX_CLK_SYSCLK_HCLK_MUX,
LPC32XX_CLK_SYSCLK_ARM_MUX,
/* Two clock sources external to the driver */
LPC32XX_CLK_XTAL_32K,
LPC32XX_CLK_XTAL,
/* Renumbered USB clocks, may have a parent from SCB table */
LPC32XX_CLK_USB_OFFSET,
LPC32XX_CLK_USB_I2C = LPC32XX_USB_CLK_I2C + LPC32XX_CLK_USB_OFFSET,
LPC32XX_CLK_USB_DEV = LPC32XX_USB_CLK_DEVICE + LPC32XX_CLK_USB_OFFSET,
LPC32XX_CLK_USB_HOST = LPC32XX_USB_CLK_HOST + LPC32XX_CLK_USB_OFFSET,
LPC32XX_CLK_USB_OTG = LPC32XX_USB_CLK_OTG + LPC32XX_CLK_USB_OFFSET,
LPC32XX_CLK_USB_AHB = LPC32XX_USB_CLK_AHB + LPC32XX_CLK_USB_OFFSET,
/* Stub for composite clocks */
LPC32XX_CLK__NULL,
/* Subclocks of composite clocks, clocks above are for CCF */
LPC32XX_CLK_PWM1_MUX,
LPC32XX_CLK_PWM1_DIV,
LPC32XX_CLK_PWM1_GATE,
LPC32XX_CLK_PWM2_MUX,
LPC32XX_CLK_PWM2_DIV,
LPC32XX_CLK_PWM2_GATE,
LPC32XX_CLK_UART3_MUX,
LPC32XX_CLK_UART3_DIV,
LPC32XX_CLK_UART3_GATE,
LPC32XX_CLK_UART4_MUX,
LPC32XX_CLK_UART4_DIV,
LPC32XX_CLK_UART4_GATE,
LPC32XX_CLK_UART5_MUX,
LPC32XX_CLK_UART5_DIV,
LPC32XX_CLK_UART5_GATE,
LPC32XX_CLK_UART6_MUX,
LPC32XX_CLK_UART6_DIV,
LPC32XX_CLK_UART6_GATE,
LPC32XX_CLK_TEST1_MUX,
LPC32XX_CLK_TEST1_GATE,
LPC32XX_CLK_TEST2_MUX,
LPC32XX_CLK_TEST2_GATE,
LPC32XX_CLK_USB_DIV_DIV,
LPC32XX_CLK_USB_DIV_GATE,
LPC32XX_CLK_SD_DIV,
LPC32XX_CLK_SD_GATE,
LPC32XX_CLK_LCD_DIV,
LPC32XX_CLK_LCD_GATE,
LPC32XX_CLK_HW_MAX,
LPC32XX_CLK_MAX = LPC32XX_CLK_SYSCLK_ARM_MUX + 1,
LPC32XX_CLK_CCF_MAX = LPC32XX_CLK_USB_AHB + 1,
};
static struct clk *clk[LPC32XX_CLK_MAX];
static struct clk_onecell_data clk_data = {
.clks = clk,
.clk_num = LPC32XX_CLK_MAX,
};
static struct clk *usb_clk[LPC32XX_USB_CLK_MAX];
static struct clk_onecell_data usb_clk_data = {
.clks = usb_clk,
.clk_num = LPC32XX_USB_CLK_MAX,
};
#define LPC32XX_CLK_PARENTS_MAX 5
struct clk_proto_t {
const char *name;
const u8 parents[LPC32XX_CLK_PARENTS_MAX];
u8 num_parents;
unsigned long flags;
};
#define CLK_PREFIX(LITERAL) LPC32XX_CLK_ ## LITERAL
#define NUMARGS(...) (sizeof((int[]){__VA_ARGS__})/sizeof(int))
#define LPC32XX_CLK_DEFINE(_idx, _name, _flags, ...) \
[CLK_PREFIX(_idx)] = { \
.name = _name, \
.flags = _flags, \
.parents = { __VA_ARGS__ }, \
.num_parents = NUMARGS(__VA_ARGS__), \
}
static const struct clk_proto_t clk_proto[LPC32XX_CLK_CCF_MAX] __initconst = {
LPC32XX_CLK_DEFINE(XTAL, "xtal", 0x0),
LPC32XX_CLK_DEFINE(XTAL_32K, "xtal_32k", 0x0),
LPC32XX_CLK_DEFINE(RTC, "rtc", 0x0, LPC32XX_CLK_XTAL_32K),
LPC32XX_CLK_DEFINE(OSC, "osc", CLK_IGNORE_UNUSED, LPC32XX_CLK_XTAL),
LPC32XX_CLK_DEFINE(SYS, "sys", CLK_IGNORE_UNUSED,
LPC32XX_CLK_OSC, LPC32XX_CLK_PLL397X),
LPC32XX_CLK_DEFINE(PLL397X, "pll_397x", CLK_IGNORE_UNUSED,
LPC32XX_CLK_RTC),
LPC32XX_CLK_DEFINE(HCLK_PLL, "hclk_pll", CLK_IGNORE_UNUSED,
LPC32XX_CLK_SYS),
LPC32XX_CLK_DEFINE(HCLK_DIV_PERIPH, "hclk_div_periph",
CLK_IGNORE_UNUSED, LPC32XX_CLK_HCLK_PLL),
LPC32XX_CLK_DEFINE(HCLK_DIV, "hclk_div", CLK_IGNORE_UNUSED,
LPC32XX_CLK_HCLK_PLL),
LPC32XX_CLK_DEFINE(HCLK, "hclk", CLK_IGNORE_UNUSED,
LPC32XX_CLK_PERIPH_HCLK_MUX),
LPC32XX_CLK_DEFINE(PERIPH, "pclk", CLK_IGNORE_UNUSED,
LPC32XX_CLK_SYSCLK_PERIPH_MUX),
LPC32XX_CLK_DEFINE(ARM, "arm", CLK_IGNORE_UNUSED,
LPC32XX_CLK_PERIPH_ARM_MUX),
LPC32XX_CLK_DEFINE(PERIPH_HCLK_MUX, "periph_hclk_mux",
CLK_IGNORE_UNUSED,
LPC32XX_CLK_SYSCLK_HCLK_MUX, LPC32XX_CLK_SYSCLK_PERIPH_MUX),
LPC32XX_CLK_DEFINE(PERIPH_ARM_MUX, "periph_arm_mux", CLK_IGNORE_UNUSED,
LPC32XX_CLK_SYSCLK_ARM_MUX, LPC32XX_CLK_SYSCLK_PERIPH_MUX),
LPC32XX_CLK_DEFINE(SYSCLK_PERIPH_MUX, "sysclk_periph_mux",
CLK_IGNORE_UNUSED,
LPC32XX_CLK_SYS, LPC32XX_CLK_HCLK_DIV_PERIPH),
LPC32XX_CLK_DEFINE(SYSCLK_HCLK_MUX, "sysclk_hclk_mux",
CLK_IGNORE_UNUSED,
LPC32XX_CLK_SYS, LPC32XX_CLK_HCLK_DIV),
LPC32XX_CLK_DEFINE(SYSCLK_ARM_MUX, "sysclk_arm_mux", CLK_IGNORE_UNUSED,
LPC32XX_CLK_SYS, LPC32XX_CLK_HCLK_PLL),
LPC32XX_CLK_DEFINE(ARM_VFP, "vfp9", CLK_IGNORE_UNUSED,
LPC32XX_CLK_ARM),
LPC32XX_CLK_DEFINE(USB_PLL, "usb_pll",
CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT, LPC32XX_CLK_USB_DIV),
LPC32XX_CLK_DEFINE(USB_DIV, "usb_div", 0x0, LPC32XX_CLK_OSC),
LPC32XX_CLK_DEFINE(USB, "usb", 0x0, LPC32XX_CLK_USB_PLL),
LPC32XX_CLK_DEFINE(DMA, "dma", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(MLC, "mlc", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(SLC, "slc", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(LCD, "lcd", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(MAC, "mac", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(SD, "sd", 0x0, LPC32XX_CLK_ARM),
LPC32XX_CLK_DEFINE(DDRAM, "ddram", CLK_GET_RATE_NOCACHE,
LPC32XX_CLK_SYSCLK_ARM_MUX),
LPC32XX_CLK_DEFINE(SSP0, "ssp0", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(SSP1, "ssp1", 0x0, LPC32XX_CLK_HCLK),
/*
* CLK_GET_RATE_NOCACHE is needed, if UART clock is disabled, its
* divider register does not contain information about selected rate.
*/
LPC32XX_CLK_DEFINE(UART3, "uart3", CLK_GET_RATE_NOCACHE,
LPC32XX_CLK_PERIPH, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(UART4, "uart4", CLK_GET_RATE_NOCACHE,
LPC32XX_CLK_PERIPH, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(UART5, "uart5", CLK_GET_RATE_NOCACHE,
LPC32XX_CLK_PERIPH, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(UART6, "uart6", CLK_GET_RATE_NOCACHE,
LPC32XX_CLK_PERIPH, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(IRDA, "irda", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(I2C1, "i2c1", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(I2C2, "i2c2", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(TIMER0, "timer0", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(TIMER1, "timer1", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(TIMER2, "timer2", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(TIMER3, "timer3", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(TIMER4, "timer4", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(TIMER5, "timer5", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(WDOG, "watchdog", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(I2S0, "i2s0", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(I2S1, "i2s1", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(SPI1, "spi1", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(SPI2, "spi2", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(MCPWM, "mcpwm", 0x0, LPC32XX_CLK_HCLK),
LPC32XX_CLK_DEFINE(HSTIMER, "hstimer", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(KEY, "key", 0x0, LPC32XX_CLK_RTC),
LPC32XX_CLK_DEFINE(PWM1, "pwm1", 0x0,
LPC32XX_CLK_RTC, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(PWM2, "pwm2", 0x0,
LPC32XX_CLK_RTC, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(ADC, "adc", 0x0,
LPC32XX_CLK_ADC_RTC, LPC32XX_CLK_ADC_DIV),
LPC32XX_CLK_DEFINE(ADC_DIV, "adc_div", 0x0, LPC32XX_CLK_PERIPH),
LPC32XX_CLK_DEFINE(ADC_RTC, "adc_rtc", 0x0, LPC32XX_CLK_RTC),
LPC32XX_CLK_DEFINE(TEST1, "test1", 0x0,
LPC32XX_CLK_PERIPH, LPC32XX_CLK_RTC, LPC32XX_CLK_OSC),
LPC32XX_CLK_DEFINE(TEST2, "test2", 0x0,
LPC32XX_CLK_HCLK, LPC32XX_CLK_PERIPH, LPC32XX_CLK_USB,
LPC32XX_CLK_OSC, LPC32XX_CLK_PLL397X),
/* USB controller clocks */
LPC32XX_CLK_DEFINE(USB_AHB, "usb_ahb", 0x0, LPC32XX_CLK_USB),
LPC32XX_CLK_DEFINE(USB_OTG, "usb_otg", 0x0, LPC32XX_CLK_USB_AHB),
LPC32XX_CLK_DEFINE(USB_I2C, "usb_i2c", 0x0, LPC32XX_CLK_USB_AHB),
LPC32XX_CLK_DEFINE(USB_DEV, "usb_dev", 0x0, LPC32XX_CLK_USB_OTG),
LPC32XX_CLK_DEFINE(USB_HOST, "usb_host", 0x0, LPC32XX_CLK_USB_OTG),
};
struct lpc32xx_clk {
struct clk_hw hw;
u32 reg;
u32 enable;
u32 enable_mask;
u32 disable;
u32 disable_mask;
u32 busy;
u32 busy_mask;
};
enum clk_pll_mode {
PLL_UNKNOWN,
PLL_DIRECT,
PLL_BYPASS,
PLL_DIRECT_BYPASS,
PLL_INTEGER,
PLL_NON_INTEGER,
};
struct lpc32xx_pll_clk {
struct clk_hw hw;
u32 reg;
u32 enable;
unsigned long m_div;
unsigned long n_div;
unsigned long p_div;
enum clk_pll_mode mode;
};
struct lpc32xx_usb_clk {
struct clk_hw hw;
u32 ctrl_enable;
u32 ctrl_disable;
u32 ctrl_mask;
u32 enable;
u32 busy;
};
struct lpc32xx_clk_mux {
struct clk_hw hw;
u32 reg;
u32 mask;
u8 shift;
u32 *table;
u8 flags;
};
struct lpc32xx_clk_div {
struct clk_hw hw;
u32 reg;
u8 shift;
u8 width;
const struct clk_div_table *table;
u8 flags;
};
struct lpc32xx_clk_gate {
struct clk_hw hw;
u32 reg;
u8 bit_idx;
u8 flags;
};
#define to_lpc32xx_clk(_hw) container_of(_hw, struct lpc32xx_clk, hw)
#define to_lpc32xx_pll_clk(_hw) container_of(_hw, struct lpc32xx_pll_clk, hw)
#define to_lpc32xx_usb_clk(_hw) container_of(_hw, struct lpc32xx_usb_clk, hw)
#define to_lpc32xx_mux(_hw) container_of(_hw, struct lpc32xx_clk_mux, hw)
#define to_lpc32xx_div(_hw) container_of(_hw, struct lpc32xx_clk_div, hw)
#define to_lpc32xx_gate(_hw) container_of(_hw, struct lpc32xx_clk_gate, hw)
static inline bool pll_is_valid(u64 val0, u64 val1, u64 min, u64 max)
{
return (val0 >= (val1 * min) && val0 <= (val1 * max));
}
static inline u32 lpc32xx_usb_clk_read(struct lpc32xx_usb_clk *clk)
{
return readl(usb_clk_vbase + LPC32XX_USB_CLK_STS);
}
static inline void lpc32xx_usb_clk_write(struct lpc32xx_usb_clk *clk, u32 val)
{
writel(val, usb_clk_vbase + LPC32XX_USB_CLK_CTRL);
}
static int clk_mask_enable(struct clk_hw *hw)
{
struct lpc32xx_clk *clk = to_lpc32xx_clk(hw);
u32 val;
regmap_read(clk_regmap, clk->reg, &val);
if (clk->busy_mask && (val & clk->busy_mask) == clk->busy)
return -EBUSY;
return regmap_update_bits(clk_regmap, clk->reg,
clk->enable_mask, clk->enable);
}
static void clk_mask_disable(struct clk_hw *hw)
{
struct lpc32xx_clk *clk = to_lpc32xx_clk(hw);
regmap_update_bits(clk_regmap, clk->reg,
clk->disable_mask, clk->disable);
}
static int clk_mask_is_enabled(struct clk_hw *hw)
{
struct lpc32xx_clk *clk = to_lpc32xx_clk(hw);
u32 val;
regmap_read(clk_regmap, clk->reg, &val);
return ((val & clk->enable_mask) == clk->enable);
}
static const struct clk_ops clk_mask_ops = {
.enable = clk_mask_enable,
.disable = clk_mask_disable,
.is_enabled = clk_mask_is_enabled,
};
static int clk_pll_enable(struct clk_hw *hw)
{
struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw);
u32 val, count;
regmap_update_bits(clk_regmap, clk->reg, clk->enable, clk->enable);
for (count = 0; count < 1000; count++) {
regmap_read(clk_regmap, clk->reg, &val);
if (val & PLL_CTRL_LOCK)
break;
}
if (val & PLL_CTRL_LOCK)
return 0;
return -ETIMEDOUT;
}
static void clk_pll_disable(struct clk_hw *hw)
{
struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw);
regmap_update_bits(clk_regmap, clk->reg, clk->enable, 0x0);
}
static int clk_pll_is_enabled(struct clk_hw *hw)
{
struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw);
u32 val;
regmap_read(clk_regmap, clk->reg, &val);
val &= clk->enable | PLL_CTRL_LOCK;
if (val == (clk->enable | PLL_CTRL_LOCK))
return 1;
return 0;
}
static unsigned long clk_pll_397x_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
return parent_rate * 397;
}
static unsigned long clk_pll_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw);
bool is_direct, is_bypass, is_feedback;
unsigned long rate, cco_rate, ref_rate;
u32 val;
regmap_read(clk_regmap, clk->reg, &val);
is_direct = val & PLL_CTRL_DIRECT;
is_bypass = val & PLL_CTRL_BYPASS;
is_feedback = val & PLL_CTRL_FEEDBACK;
clk->m_div = ((val & PLL_CTRL_FEEDDIV) >> 1) + 1;
clk->n_div = ((val & PLL_CTRL_PREDIV) >> 9) + 1;
clk->p_div = ((val & PLL_CTRL_POSTDIV) >> 11) + 1;
if (is_direct && is_bypass) {
clk->p_div = 0;
clk->mode = PLL_DIRECT_BYPASS;
return parent_rate;
}
if (is_bypass) {
clk->mode = PLL_BYPASS;
return parent_rate / (1 << clk->p_div);
}
if (is_direct) {
clk->p_div = 0;
clk->mode = PLL_DIRECT;
}
ref_rate = parent_rate / clk->n_div;
rate = cco_rate = ref_rate * clk->m_div;
if (!is_direct) {
if (is_feedback) {
cco_rate *= (1 << clk->p_div);
clk->mode = PLL_INTEGER;
} else {
rate /= (1 << clk->p_div);
clk->mode = PLL_NON_INTEGER;
}
}
pr_debug("%s: %lu: 0x%x: %d/%d/%d, %lu/%lu/%d => %lu\n",
clk_hw_get_name(hw),
parent_rate, val, is_direct, is_bypass, is_feedback,
clk->n_div, clk->m_div, (1 << clk->p_div), rate);
if (clk_pll_is_enabled(hw) &&
!(pll_is_valid(parent_rate, 1, 1000000, 20000000)
&& pll_is_valid(cco_rate, 1, 156000000, 320000000)
&& pll_is_valid(ref_rate, 1, 1000000, 27000000)))
pr_err("%s: PLL clocks are not in valid ranges: %lu/%lu/%lu",
clk_hw_get_name(hw),
parent_rate, cco_rate, ref_rate);
return rate;
}
static int clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw);
u32 val;
unsigned long new_rate;
/* Validate PLL clock parameters computed on round rate stage */
switch (clk->mode) {
case PLL_DIRECT:
val = PLL_CTRL_DIRECT;
val |= (clk->m_div - 1) << 1;
val |= (clk->n_div - 1) << 9;
new_rate = (parent_rate * clk->m_div) / clk->n_div;
break;
case PLL_BYPASS:
val = PLL_CTRL_BYPASS;
val |= (clk->p_div - 1) << 11;
new_rate = parent_rate / (1 << (clk->p_div));
break;
case PLL_DIRECT_BYPASS:
val = PLL_CTRL_DIRECT | PLL_CTRL_BYPASS;
new_rate = parent_rate;
break;
case PLL_INTEGER:
val = PLL_CTRL_FEEDBACK;
val |= (clk->m_div - 1) << 1;
val |= (clk->n_div - 1) << 9;
val |= (clk->p_div - 1) << 11;
new_rate = (parent_rate * clk->m_div) / clk->n_div;
break;
case PLL_NON_INTEGER:
val = 0x0;
val |= (clk->m_div - 1) << 1;
val |= (clk->n_div - 1) << 9;
val |= (clk->p_div - 1) << 11;
new_rate = (parent_rate * clk->m_div) /
(clk->n_div * (1 << clk->p_div));
break;
default:
return -EINVAL;
}
/* Sanity check that round rate is equal to the requested one */
if (new_rate != rate)
return -EINVAL;
return regmap_update_bits(clk_regmap, clk->reg, 0x1FFFF, val);
}
static long clk_hclk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw);
u64 m_i, m, n, p, o = rate, i = *parent_rate, d = (u64)rate << 6;
int p_i, n_i;
pr_debug("%s: %lu/%lu\n", clk_hw_get_name(hw), *parent_rate, rate);
if (rate > 266500000)
return -EINVAL;
/* Have to check all 20 possibilities to find the minimal M */
for (p_i = 4; p_i >= 0; p_i--) {
for (n_i = 4; n_i > 0; n_i--) {
m_i = div64_u64(o * n_i * (1 << p_i), i);
/* Check for valid PLL parameter constraints */
if (!(m_i && m_i <= 256
&& pll_is_valid(i, n_i, 1000000, 27000000)
&& pll_is_valid(i * m_i * (1 << p_i), n_i,
156000000, 320000000)))
continue;
/* Store some intermediate valid parameters */
if (o * n_i * (1 << p_i) - i * m_i <= d) {
m = m_i;
n = n_i;
p = p_i;
d = o * n_i * (1 << p_i) - i * m_i;
}
}
}
if (d == (u64)rate << 6) {
pr_err("%s: %lu: no valid PLL parameters are found\n",
clk_hw_get_name(hw), rate);
return -EINVAL;
}
clk->m_div = m;
clk->n_div = n;
clk->p_div = p;
/* Set only direct or non-integer mode of PLL */
if (!p)
clk->mode = PLL_DIRECT;
else
clk->mode = PLL_NON_INTEGER;
o = div64_u64(i * m, n * (1 << p));
if (!d)
pr_debug("%s: %lu: found exact match: %llu/%llu/%llu\n",
clk_hw_get_name(hw), rate, m, n, p);
else
pr_debug("%s: %lu: found closest: %llu/%llu/%llu - %llu\n",
clk_hw_get_name(hw), rate, m, n, p, o);
return o;
}
static long clk_usb_pll_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct lpc32xx_pll_clk *clk = to_lpc32xx_pll_clk(hw);
struct clk_hw *usb_div_hw, *osc_hw;
u64 d_i, n_i, m, o;
pr_debug("%s: %lu/%lu\n", clk_hw_get_name(hw), *parent_rate, rate);
/*
* The only supported USB clock is 48MHz, with PLL internal constraints
* on Fclkin, Fcco and Fref this implies that Fcco must be 192MHz
* and post-divider must be 4, this slightly simplifies calculation of
* USB divider, USB PLL N and M parameters.
*/
if (rate != 48000000)
return -EINVAL;
/* USB divider clock */
usb_div_hw = clk_hw_get_parent_by_index(hw, 0);
if (!usb_div_hw)
return -EINVAL;
/* Main oscillator clock */
osc_hw = clk_hw_get_parent_by_index(usb_div_hw, 0);
if (!osc_hw)
return -EINVAL;
o = clk_hw_get_rate(osc_hw); /* must be in range 1..20 MHz */
/* Check if valid USB divider and USB PLL parameters exists */
for (d_i = 16; d_i >= 1; d_i--) {
for (n_i = 1; n_i <= 4; n_i++) {
m = div64_u64(192000000 * d_i * n_i, o);
if (!(m && m <= 256
&& m * o == 192000000 * d_i * n_i
&& pll_is_valid(o, d_i, 1000000, 20000000)
&& pll_is_valid(o, d_i * n_i, 1000000, 27000000)))
continue;
clk->n_div = n_i;
clk->m_div = m;
clk->p_div = 2;
clk->mode = PLL_NON_INTEGER;
*parent_rate = div64_u64(o, d_i);
return rate;
}
}
return -EINVAL;
}
#define LPC32XX_DEFINE_PLL_OPS(_name, _rc, _sr, _rr) \
static const struct clk_ops clk_ ##_name ## _ops = { \
.enable = clk_pll_enable, \
.disable = clk_pll_disable, \
.is_enabled = clk_pll_is_enabled, \
.recalc_rate = _rc, \
.set_rate = _sr, \
.round_rate = _rr, \
}
LPC32XX_DEFINE_PLL_OPS(pll_397x, clk_pll_397x_recalc_rate, NULL, NULL);
LPC32XX_DEFINE_PLL_OPS(hclk_pll, clk_pll_recalc_rate,
clk_pll_set_rate, clk_hclk_pll_round_rate);
LPC32XX_DEFINE_PLL_OPS(usb_pll, clk_pll_recalc_rate,
clk_pll_set_rate, clk_usb_pll_round_rate);
static int clk_ddram_is_enabled(struct clk_hw *hw)
{
struct lpc32xx_clk *clk = to_lpc32xx_clk(hw);
u32 val;
regmap_read(clk_regmap, clk->reg, &val);
val &= clk->enable_mask | clk->busy_mask;
return (val == (BIT(7) | BIT(0)) ||
val == (BIT(8) | BIT(1)));
}
static int clk_ddram_enable(struct clk_hw *hw)
{
struct lpc32xx_clk *clk = to_lpc32xx_clk(hw);
u32 val, hclk_div;
regmap_read(clk_regmap, clk->reg, &val);
hclk_div = val & clk->busy_mask;
/*
* DDRAM clock must be 2 times higher than HCLK,
* this implies DDRAM clock can not be enabled,
* if HCLK clock rate is equal to ARM clock rate
*/
if (hclk_div == 0x0 || hclk_div == (BIT(1) | BIT(0)))
return -EINVAL;
return regmap_update_bits(clk_regmap, clk->reg,
clk->enable_mask, hclk_div << 7);
}
static unsigned long clk_ddram_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct lpc32xx_clk *clk = to_lpc32xx_clk(hw);
u32 val;
if (!clk_ddram_is_enabled(hw))
return 0;
regmap_read(clk_regmap, clk->reg, &val);
val &= clk->enable_mask;
return parent_rate / (val >> 7);
}
static const struct clk_ops clk_ddram_ops = {
.enable = clk_ddram_enable,
.disable = clk_mask_disable,
.is_enabled = clk_ddram_is_enabled,
.recalc_rate = clk_ddram_recalc_rate,
};
static unsigned long lpc32xx_clk_uart_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct lpc32xx_clk *clk = to_lpc32xx_clk(hw);
u32 val, x, y;
regmap_read(clk_regmap, clk->reg, &val);
x = (val & 0xFF00) >> 8;
y = val & 0xFF;
if (x && y)
return (parent_rate * x) / y;
else
return 0;
}
static const struct clk_ops lpc32xx_uart_div_ops = {
.recalc_rate = lpc32xx_clk_uart_recalc_rate,
};
static const struct clk_div_table clk_hclk_div_table[] = {
{ .val = 0, .div = 1 },
{ .val = 1, .div = 2 },
{ .val = 2, .div = 4 },
{ },
};
static u32 test1_mux_table[] = { 0, 1, 2, };
static u32 test2_mux_table[] = { 0, 1, 2, 5, 7, };
static int clk_usb_enable(struct clk_hw *hw)
{
struct lpc32xx_usb_clk *clk = to_lpc32xx_usb_clk(hw);
u32 val, ctrl_val, count;
pr_debug("%s: 0x%x\n", clk_hw_get_name(hw), clk->enable);
if (clk->ctrl_mask) {
regmap_read(clk_regmap, LPC32XX_CLKPWR_USB_CTRL, &ctrl_val);
regmap_update_bits(clk_regmap, LPC32XX_CLKPWR_USB_CTRL,
clk->ctrl_mask, clk->ctrl_enable);
}
val = lpc32xx_usb_clk_read(clk);
if (clk->busy && (val & clk->busy) == clk->busy) {
if (clk->ctrl_mask)
regmap_write(clk_regmap, LPC32XX_CLKPWR_USB_CTRL,
ctrl_val);
return -EBUSY;
}
val |= clk->enable;
lpc32xx_usb_clk_write(clk, val);
for (count = 0; count < 1000; count++) {
val = lpc32xx_usb_clk_read(clk);
if ((val & clk->enable) == clk->enable)
break;
}
if ((val & clk->enable) == clk->enable)
return 0;
if (clk->ctrl_mask)
regmap_write(clk_regmap, LPC32XX_CLKPWR_USB_CTRL, ctrl_val);
return -ETIMEDOUT;
}
static void clk_usb_disable(struct clk_hw *hw)
{
struct lpc32xx_usb_clk *clk = to_lpc32xx_usb_clk(hw);
u32 val = lpc32xx_usb_clk_read(clk);
val &= ~clk->enable;
lpc32xx_usb_clk_write(clk, val);
if (clk->ctrl_mask)
regmap_update_bits(clk_regmap, LPC32XX_CLKPWR_USB_CTRL,
clk->ctrl_mask, clk->ctrl_disable);
}
static int clk_usb_is_enabled(struct clk_hw *hw)
{
struct lpc32xx_usb_clk *clk = to_lpc32xx_usb_clk(hw);
u32 ctrl_val, val;
if (clk->ctrl_mask) {
regmap_read(clk_regmap, LPC32XX_CLKPWR_USB_CTRL, &ctrl_val);
if ((ctrl_val & clk->ctrl_mask) != clk->ctrl_enable)
return 0;
}
val = lpc32xx_usb_clk_read(clk);
return ((val & clk->enable) == clk->enable);
}
static unsigned long clk_usb_i2c_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
return clk_get_rate(clk[LPC32XX_CLK_PERIPH]);
}
static const struct clk_ops clk_usb_ops = {
.enable = clk_usb_enable,
.disable = clk_usb_disable,
.is_enabled = clk_usb_is_enabled,
};
static const struct clk_ops clk_usb_i2c_ops = {
.enable = clk_usb_enable,
.disable = clk_usb_disable,
.is_enabled = clk_usb_is_enabled,
.recalc_rate = clk_usb_i2c_recalc_rate,
};
static int clk_gate_enable(struct clk_hw *hw)
{
struct lpc32xx_clk_gate *clk = to_lpc32xx_gate(hw);
u32 mask = BIT(clk->bit_idx);
u32 val = (clk->flags & CLK_GATE_SET_TO_DISABLE ? 0x0 : mask);
return regmap_update_bits(clk_regmap, clk->reg, mask, val);
}
static void clk_gate_disable(struct clk_hw *hw)
{
struct lpc32xx_clk_gate *clk = to_lpc32xx_gate(hw);
u32 mask = BIT(clk->bit_idx);
u32 val = (clk->flags & CLK_GATE_SET_TO_DISABLE ? mask : 0x0);
regmap_update_bits(clk_regmap, clk->reg, mask, val);
}
static int clk_gate_is_enabled(struct clk_hw *hw)
{
struct lpc32xx_clk_gate *clk = to_lpc32xx_gate(hw);
u32 val;
bool is_set;
regmap_read(clk_regmap, clk->reg, &val);
is_set = val & BIT(clk->bit_idx);
return (clk->flags & CLK_GATE_SET_TO_DISABLE ? !is_set : is_set);
}
static const struct clk_ops lpc32xx_clk_gate_ops = {
.enable = clk_gate_enable,
.disable = clk_gate_disable,
.is_enabled = clk_gate_is_enabled,
};
#define div_mask(width) ((1 << (width)) - 1)
static unsigned int _get_table_div(const struct clk_div_table *table,
unsigned int val)
{
const struct clk_div_table *clkt;
for (clkt = table; clkt->div; clkt++)
if (clkt->val == val)
return clkt->div;
return 0;
}
static unsigned int _get_div(const struct clk_div_table *table,
unsigned int val, unsigned long flags, u8 width)
{
if (flags & CLK_DIVIDER_ONE_BASED)
return val;
if (table)
return _get_table_div(table, val);
return val + 1;
}
static unsigned long clk_divider_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct lpc32xx_clk_div *divider = to_lpc32xx_div(hw);
unsigned int val;
regmap_read(clk_regmap, divider->reg, &val);
val >>= divider->shift;
val &= div_mask(divider->width);
return divider_recalc_rate(hw, parent_rate, val, divider->table,
divider->flags);
}
static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct lpc32xx_clk_div *divider = to_lpc32xx_div(hw);
unsigned int bestdiv;
/* if read only, just return current value */
if (divider->flags & CLK_DIVIDER_READ_ONLY) {
regmap_read(clk_regmap, divider->reg, &bestdiv);
bestdiv >>= divider->shift;
bestdiv &= div_mask(divider->width);
bestdiv = _get_div(divider->table, bestdiv, divider->flags,
divider->width);
return DIV_ROUND_UP(*prate, bestdiv);
}
return divider_round_rate(hw, rate, prate, divider->table,
divider->width, divider->flags);
}
static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct lpc32xx_clk_div *divider = to_lpc32xx_div(hw);
unsigned int value;
value = divider_get_val(rate, parent_rate, divider->table,
divider->width, divider->flags);
return regmap_update_bits(clk_regmap, divider->reg,
div_mask(divider->width) << divider->shift,
value << divider->shift);
}
static const struct clk_ops lpc32xx_clk_divider_ops = {
.recalc_rate = clk_divider_recalc_rate,
.round_rate = clk_divider_round_rate,
.set_rate = clk_divider_set_rate,
};
static u8 clk_mux_get_parent(struct clk_hw *hw)
{
struct lpc32xx_clk_mux *mux = to_lpc32xx_mux(hw);
u32 num_parents = clk_hw_get_num_parents(hw);
u32 val;
regmap_read(clk_regmap, mux->reg, &val);
val >>= mux->shift;
val &= mux->mask;
if (mux->table) {
u32 i;
for (i = 0; i < num_parents; i++)
if (mux->table[i] == val)
return i;
return -EINVAL;
}
if (val >= num_parents)
return -EINVAL;
return val;
}
static int clk_mux_set_parent(struct clk_hw *hw, u8 index)
{
struct lpc32xx_clk_mux *mux = to_lpc32xx_mux(hw);
if (mux->table)
index = mux->table[index];
return regmap_update_bits(clk_regmap, mux->reg,
mux->mask << mux->shift, index << mux->shift);
}
static const struct clk_ops lpc32xx_clk_mux_ro_ops = {
.get_parent = clk_mux_get_parent,
};
static const struct clk_ops lpc32xx_clk_mux_ops = {
.get_parent = clk_mux_get_parent,
.set_parent = clk_mux_set_parent,
.determine_rate = __clk_mux_determine_rate,
};
enum lpc32xx_clk_type {
CLK_FIXED,
CLK_MUX,
CLK_DIV,
CLK_GATE,
CLK_COMPOSITE,
CLK_LPC32XX,
CLK_LPC32XX_PLL,
CLK_LPC32XX_USB,
};
struct clk_hw_proto0 {
const struct clk_ops *ops;
union {
struct lpc32xx_pll_clk pll;
struct lpc32xx_clk clk;
struct lpc32xx_usb_clk usb_clk;
struct lpc32xx_clk_mux mux;
struct lpc32xx_clk_div div;
struct lpc32xx_clk_gate gate;
};
};
struct clk_hw_proto1 {
struct clk_hw_proto0 *mux;
struct clk_hw_proto0 *div;
struct clk_hw_proto0 *gate;
};
struct clk_hw_proto {
enum lpc32xx_clk_type type;
union {
struct clk_fixed_rate f;
struct clk_hw_proto0 hw0;
struct clk_hw_proto1 hw1;
};
};
#define LPC32XX_DEFINE_FIXED(_idx, _rate, _flags) \
[CLK_PREFIX(_idx)] = { \
.type = CLK_FIXED, \
{ \
.f = { \
.fixed_rate = (_rate), \
.flags = (_flags), \
}, \
}, \
}
#define LPC32XX_DEFINE_PLL(_idx, _name, _reg, _enable) \
[CLK_PREFIX(_idx)] = { \
.type = CLK_LPC32XX_PLL, \
{ \
.hw0 = { \
.ops = &clk_ ##_name ## _ops, \
{ \
.pll = { \
.reg = LPC32XX_CLKPWR_ ## _reg, \
.enable = (_enable), \
}, \
}, \
}, \
}, \
}
#define LPC32XX_DEFINE_MUX(_idx, _reg, _shift, _mask, _table, _flags) \
[CLK_PREFIX(_idx)] = { \
.type = CLK_MUX, \
{ \
.hw0 = { \
.ops = (_flags & CLK_MUX_READ_ONLY ? \
&lpc32xx_clk_mux_ro_ops : \
&lpc32xx_clk_mux_ops), \
{ \
.mux = { \
.reg = LPC32XX_CLKPWR_ ## _reg, \
.mask = (_mask), \
.shift = (_shift), \
.table = (_table), \
.flags = (_flags), \
}, \
}, \
}, \
}, \
}
#define LPC32XX_DEFINE_DIV(_idx, _reg, _shift, _width, _table, _flags) \
[CLK_PREFIX(_idx)] = { \
.type = CLK_DIV, \
{ \
.hw0 = { \
.ops = &lpc32xx_clk_divider_ops, \
{ \
.div = { \
.reg = LPC32XX_CLKPWR_ ## _reg, \
.shift = (_shift), \
.width = (_width), \
.table = (_table), \
.flags = (_flags), \
}, \
}, \
}, \
}, \
}
#define LPC32XX_DEFINE_GATE(_idx, _reg, _bit, _flags) \
[CLK_PREFIX(_idx)] = { \
.type = CLK_GATE, \
{ \
.hw0 = { \
.ops = &lpc32xx_clk_gate_ops, \
{ \
.gate = { \
.reg = LPC32XX_CLKPWR_ ## _reg, \
.bit_idx = (_bit), \
.flags = (_flags), \
}, \
}, \
}, \
}, \
}
#define LPC32XX_DEFINE_CLK(_idx, _reg, _e, _em, _d, _dm, _b, _bm, _ops) \
[CLK_PREFIX(_idx)] = { \
.type = CLK_LPC32XX, \
{ \
.hw0 = { \
.ops = &(_ops), \
{ \
.clk = { \
.reg = LPC32XX_CLKPWR_ ## _reg, \
.enable = (_e), \
.enable_mask = (_em), \
.disable = (_d), \
.disable_mask = (_dm), \
.busy = (_b), \
.busy_mask = (_bm), \
}, \
}, \
}, \
}, \
}
#define LPC32XX_DEFINE_USB(_idx, _ce, _cd, _cm, _e, _b, _ops) \
[CLK_PREFIX(_idx)] = { \
.type = CLK_LPC32XX_USB, \
{ \
.hw0 = { \
.ops = &(_ops), \
{ \
.usb_clk = { \
.ctrl_enable = (_ce), \
.ctrl_disable = (_cd), \
.ctrl_mask = (_cm), \
.enable = (_e), \
.busy = (_b), \
} \
}, \
} \
}, \
}
#define LPC32XX_DEFINE_COMPOSITE(_idx, _mux, _div, _gate) \
[CLK_PREFIX(_idx)] = { \
.type = CLK_COMPOSITE, \
{ \
.hw1 = { \
.mux = (CLK_PREFIX(_mux) == LPC32XX_CLK__NULL ? NULL : \
&clk_hw_proto[CLK_PREFIX(_mux)].hw0), \
.div = (CLK_PREFIX(_div) == LPC32XX_CLK__NULL ? NULL : \
&clk_hw_proto[CLK_PREFIX(_div)].hw0), \
.gate = (CLK_PREFIX(_gate) == LPC32XX_CLK__NULL ? NULL :\
&clk_hw_proto[CLK_PREFIX(_gate)].hw0), \
}, \
}, \
}
static struct clk_hw_proto clk_hw_proto[LPC32XX_CLK_HW_MAX] = {
LPC32XX_DEFINE_FIXED(RTC, 32768, 0),
LPC32XX_DEFINE_PLL(PLL397X, pll_397x, HCLKPLL_CTRL, BIT(1)),
LPC32XX_DEFINE_PLL(HCLK_PLL, hclk_pll, HCLKPLL_CTRL, PLL_CTRL_ENABLE),
LPC32XX_DEFINE_PLL(USB_PLL, usb_pll, USB_CTRL, PLL_CTRL_ENABLE),
LPC32XX_DEFINE_GATE(OSC, OSC_CTRL, 0, CLK_GATE_SET_TO_DISABLE),
LPC32XX_DEFINE_GATE(USB, USB_CTRL, 18, 0),
LPC32XX_DEFINE_DIV(HCLK_DIV_PERIPH, HCLKDIV_CTRL, 2, 5, NULL,
CLK_DIVIDER_READ_ONLY),
LPC32XX_DEFINE_DIV(HCLK_DIV, HCLKDIV_CTRL, 0, 2, clk_hclk_div_table,
CLK_DIVIDER_READ_ONLY),
/* Register 3 read-only muxes with a single control PWR_CTRL[2] */
LPC32XX_DEFINE_MUX(SYSCLK_PERIPH_MUX, PWR_CTRL, 2, 0x1, NULL,
CLK_MUX_READ_ONLY),
LPC32XX_DEFINE_MUX(SYSCLK_HCLK_MUX, PWR_CTRL, 2, 0x1, NULL,
CLK_MUX_READ_ONLY),
LPC32XX_DEFINE_MUX(SYSCLK_ARM_MUX, PWR_CTRL, 2, 0x1, NULL,
CLK_MUX_READ_ONLY),
/* Register 2 read-only muxes with a single control PWR_CTRL[10] */
LPC32XX_DEFINE_MUX(PERIPH_HCLK_MUX, PWR_CTRL, 10, 0x1, NULL,
CLK_MUX_READ_ONLY),
LPC32XX_DEFINE_MUX(PERIPH_ARM_MUX, PWR_CTRL, 10, 0x1, NULL,
CLK_MUX_READ_ONLY),
/* 3 always on gates with a single control PWR_CTRL[0] same as OSC */
LPC32XX_DEFINE_GATE(PERIPH, PWR_CTRL, 0, CLK_GATE_SET_TO_DISABLE),
LPC32XX_DEFINE_GATE(HCLK, PWR_CTRL, 0, CLK_GATE_SET_TO_DISABLE),
LPC32XX_DEFINE_GATE(ARM, PWR_CTRL, 0, CLK_GATE_SET_TO_DISABLE),
LPC32XX_DEFINE_GATE(ARM_VFP, DEBUG_CTRL, 4, 0),
LPC32XX_DEFINE_GATE(DMA, DMA_CLK_CTRL, 0, 0),
LPC32XX_DEFINE_CLK(DDRAM, HCLKDIV_CTRL, 0x0, BIT(8) | BIT(7),
0x0, BIT(8) | BIT(7), 0x0, BIT(1) | BIT(0), clk_ddram_ops),
LPC32XX_DEFINE_GATE(TIMER0, TIMCLK_CTRL1, 2, 0),
LPC32XX_DEFINE_GATE(TIMER1, TIMCLK_CTRL1, 3, 0),
LPC32XX_DEFINE_GATE(TIMER2, TIMCLK_CTRL1, 4, 0),
LPC32XX_DEFINE_GATE(TIMER3, TIMCLK_CTRL1, 5, 0),
LPC32XX_DEFINE_GATE(TIMER4, TIMCLK_CTRL1, 0, 0),
LPC32XX_DEFINE_GATE(TIMER5, TIMCLK_CTRL1, 1, 0),
LPC32XX_DEFINE_GATE(SSP0, SSP_CTRL, 0, 0),
LPC32XX_DEFINE_GATE(SSP1, SSP_CTRL, 1, 0),
LPC32XX_DEFINE_GATE(SPI1, SPI_CTRL, 0, 0),
LPC32XX_DEFINE_GATE(SPI2, SPI_CTRL, 4, 0),
LPC32XX_DEFINE_GATE(I2S0, I2S_CTRL, 0, 0),
LPC32XX_DEFINE_GATE(I2S1, I2S_CTRL, 1, 0),
LPC32XX_DEFINE_GATE(I2C1, I2CCLK_CTRL, 0, 0),
LPC32XX_DEFINE_GATE(I2C2, I2CCLK_CTRL, 1, 0),
LPC32XX_DEFINE_GATE(WDOG, TIMCLK_CTRL, 0, 0),
LPC32XX_DEFINE_GATE(HSTIMER, TIMCLK_CTRL, 1, 0),
LPC32XX_DEFINE_GATE(KEY, KEYCLK_CTRL, 0, 0),
LPC32XX_DEFINE_GATE(MCPWM, TIMCLK_CTRL1, 6, 0),
LPC32XX_DEFINE_MUX(PWM1_MUX, PWMCLK_CTRL, 1, 0x1, NULL, 0),
LPC32XX_DEFINE_DIV(PWM1_DIV, PWMCLK_CTRL, 4, 4, NULL,
CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO),
LPC32XX_DEFINE_GATE(PWM1_GATE, PWMCLK_CTRL, 0, 0),
LPC32XX_DEFINE_COMPOSITE(PWM1, PWM1_MUX, PWM1_DIV, PWM1_GATE),
LPC32XX_DEFINE_MUX(PWM2_MUX, PWMCLK_CTRL, 3, 0x1, NULL, 0),
LPC32XX_DEFINE_DIV(PWM2_DIV, PWMCLK_CTRL, 8, 4, NULL,
CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO),
LPC32XX_DEFINE_GATE(PWM2_GATE, PWMCLK_CTRL, 2, 0),
LPC32XX_DEFINE_COMPOSITE(PWM2, PWM2_MUX, PWM2_DIV, PWM2_GATE),
LPC32XX_DEFINE_MUX(UART3_MUX, UART3_CLK_CTRL, 16, 0x1, NULL, 0),
LPC32XX_DEFINE_CLK(UART3_DIV, UART3_CLK_CTRL,
0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops),
LPC32XX_DEFINE_GATE(UART3_GATE, UART_CLK_CTRL, 0, 0),
LPC32XX_DEFINE_COMPOSITE(UART3, UART3_MUX, UART3_DIV, UART3_GATE),
LPC32XX_DEFINE_MUX(UART4_MUX, UART4_CLK_CTRL, 16, 0x1, NULL, 0),
LPC32XX_DEFINE_CLK(UART4_DIV, UART4_CLK_CTRL,
0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops),
LPC32XX_DEFINE_GATE(UART4_GATE, UART_CLK_CTRL, 1, 0),
LPC32XX_DEFINE_COMPOSITE(UART4, UART4_MUX, UART4_DIV, UART4_GATE),
LPC32XX_DEFINE_MUX(UART5_MUX, UART5_CLK_CTRL, 16, 0x1, NULL, 0),
LPC32XX_DEFINE_CLK(UART5_DIV, UART5_CLK_CTRL,
0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops),
LPC32XX_DEFINE_GATE(UART5_GATE, UART_CLK_CTRL, 2, 0),
LPC32XX_DEFINE_COMPOSITE(UART5, UART5_MUX, UART5_DIV, UART5_GATE),
LPC32XX_DEFINE_MUX(UART6_MUX, UART6_CLK_CTRL, 16, 0x1, NULL, 0),
LPC32XX_DEFINE_CLK(UART6_DIV, UART6_CLK_CTRL,
0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops),
LPC32XX_DEFINE_GATE(UART6_GATE, UART_CLK_CTRL, 3, 0),
LPC32XX_DEFINE_COMPOSITE(UART6, UART6_MUX, UART6_DIV, UART6_GATE),
LPC32XX_DEFINE_CLK(IRDA, IRDA_CLK_CTRL,
0, 0, 0, 0, 0, 0, lpc32xx_uart_div_ops),
LPC32XX_DEFINE_MUX(TEST1_MUX, TEST_CLK_CTRL, 5, 0x3,
test1_mux_table, 0),
LPC32XX_DEFINE_GATE(TEST1_GATE, TEST_CLK_CTRL, 4, 0),
LPC32XX_DEFINE_COMPOSITE(TEST1, TEST1_MUX, _NULL, TEST1_GATE),
LPC32XX_DEFINE_MUX(TEST2_MUX, TEST_CLK_CTRL, 1, 0x7,
test2_mux_table, 0),
LPC32XX_DEFINE_GATE(TEST2_GATE, TEST_CLK_CTRL, 0, 0),
LPC32XX_DEFINE_COMPOSITE(TEST2, TEST2_MUX, _NULL, TEST2_GATE),
LPC32XX_DEFINE_MUX(SYS, SYSCLK_CTRL, 0, 0x1, NULL, CLK_MUX_READ_ONLY),
LPC32XX_DEFINE_DIV(USB_DIV_DIV, USB_DIV, 0, 4, NULL, 0),
LPC32XX_DEFINE_GATE(USB_DIV_GATE, USB_CTRL, 17, 0),
LPC32XX_DEFINE_COMPOSITE(USB_DIV, _NULL, USB_DIV_DIV, USB_DIV_GATE),
LPC32XX_DEFINE_DIV(SD_DIV, MS_CTRL, 0, 4, NULL,
CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO),
LPC32XX_DEFINE_CLK(SD_GATE, MS_CTRL, BIT(5) | BIT(9), BIT(5) | BIT(9),
0x0, BIT(5) | BIT(9), 0x0, 0x0, clk_mask_ops),
LPC32XX_DEFINE_COMPOSITE(SD, _NULL, SD_DIV, SD_GATE),
LPC32XX_DEFINE_DIV(LCD_DIV, LCDCLK_CTRL, 0, 5, NULL, 0),
LPC32XX_DEFINE_GATE(LCD_GATE, LCDCLK_CTRL, 5, 0),
LPC32XX_DEFINE_COMPOSITE(LCD, _NULL, LCD_DIV, LCD_GATE),
LPC32XX_DEFINE_CLK(MAC, MACCLK_CTRL,
BIT(2) | BIT(1) | BIT(0), BIT(2) | BIT(1) | BIT(0),
BIT(2) | BIT(1) | BIT(0), BIT(2) | BIT(1) | BIT(0),
0x0, 0x0, clk_mask_ops),
LPC32XX_DEFINE_CLK(SLC, FLASHCLK_CTRL,
BIT(2) | BIT(0), BIT(2) | BIT(0), 0x0,
BIT(0), BIT(1), BIT(2) | BIT(1), clk_mask_ops),
LPC32XX_DEFINE_CLK(MLC, FLASHCLK_CTRL,
BIT(1), BIT(2) | BIT(1), 0x0, BIT(1),
BIT(2) | BIT(0), BIT(2) | BIT(0), clk_mask_ops),
/*
* ADC/TS clock unfortunately cannot be registered as a composite one
* due to a different connection of gate, div and mux, e.g. gating it
* won't mean that the clock is off, if peripheral clock is its parent:
*
* rtc-->[gate]-->| |
* | mux |--> adc/ts
* pclk-->[div]-->| |
*
* Constraints:
* ADC --- resulting clock must be <= 4.5 MHz
* TS --- resulting clock must be <= 400 KHz
*/
LPC32XX_DEFINE_DIV(ADC_DIV, ADCCLK_CTRL1, 0, 8, NULL, 0),
LPC32XX_DEFINE_GATE(ADC_RTC, ADCCLK_CTRL, 0, 0),
LPC32XX_DEFINE_MUX(ADC, ADCCLK_CTRL1, 8, 0x1, NULL, 0),
/* USB controller clocks */
LPC32XX_DEFINE_USB(USB_AHB,
BIT(24), 0x0, BIT(24), BIT(4), 0, clk_usb_ops),
LPC32XX_DEFINE_USB(USB_OTG,
0x0, 0x0, 0x0, BIT(3), 0, clk_usb_ops),
LPC32XX_DEFINE_USB(USB_I2C,
0x0, BIT(23), BIT(23), BIT(2), 0, clk_usb_i2c_ops),
LPC32XX_DEFINE_USB(USB_DEV,
BIT(22), 0x0, BIT(22), BIT(1), BIT(0), clk_usb_ops),
LPC32XX_DEFINE_USB(USB_HOST,
BIT(21), 0x0, BIT(21), BIT(0), BIT(1), clk_usb_ops),
};
static struct clk * __init lpc32xx_clk_register(u32 id)
{
const struct clk_proto_t *lpc32xx_clk = &clk_proto[id];
struct clk_hw_proto *clk_hw = &clk_hw_proto[id];
const char *parents[LPC32XX_CLK_PARENTS_MAX];
struct clk *clk;
unsigned int i;
for (i = 0; i < lpc32xx_clk->num_parents; i++)
parents[i] = clk_proto[lpc32xx_clk->parents[i]].name;
pr_debug("%s: derived from '%s', clock type %d\n", lpc32xx_clk->name,
parents[0], clk_hw->type);
switch (clk_hw->type) {
case CLK_LPC32XX:
case CLK_LPC32XX_PLL:
case CLK_LPC32XX_USB:
case CLK_MUX:
case CLK_DIV:
case CLK_GATE:
{
struct clk_init_data clk_init = {
.name = lpc32xx_clk->name,
.parent_names = parents,
.num_parents = lpc32xx_clk->num_parents,
.flags = lpc32xx_clk->flags,
.ops = clk_hw->hw0.ops,
};
struct clk_hw *hw;
if (clk_hw->type == CLK_LPC32XX)
hw = &clk_hw->hw0.clk.hw;
else if (clk_hw->type == CLK_LPC32XX_PLL)
hw = &clk_hw->hw0.pll.hw;
else if (clk_hw->type == CLK_LPC32XX_USB)
hw = &clk_hw->hw0.usb_clk.hw;
else if (clk_hw->type == CLK_MUX)
hw = &clk_hw->hw0.mux.hw;
else if (clk_hw->type == CLK_DIV)
hw = &clk_hw->hw0.div.hw;
else if (clk_hw->type == CLK_GATE)
hw = &clk_hw->hw0.gate.hw;
hw->init = &clk_init;
clk = clk_register(NULL, hw);
break;
}
case CLK_COMPOSITE:
{
struct clk_hw *mux_hw = NULL, *div_hw = NULL, *gate_hw = NULL;
const struct clk_ops *mops = NULL, *dops = NULL, *gops = NULL;
struct clk_hw_proto0 *mux0, *div0, *gate0;
mux0 = clk_hw->hw1.mux;
div0 = clk_hw->hw1.div;
gate0 = clk_hw->hw1.gate;
if (mux0) {
mops = mux0->ops;
mux_hw = &mux0->clk.hw;
}
if (div0) {
dops = div0->ops;
div_hw = &div0->clk.hw;
}
if (gate0) {
gops = gate0->ops;
gate_hw = &gate0->clk.hw;
}
clk = clk_register_composite(NULL, lpc32xx_clk->name,
parents, lpc32xx_clk->num_parents,
mux_hw, mops, div_hw, dops,
gate_hw, gops, lpc32xx_clk->flags);
break;
}
case CLK_FIXED:
{
struct clk_fixed_rate *fixed = &clk_hw->f;
clk = clk_register_fixed_rate(NULL, lpc32xx_clk->name,
parents[0], fixed->flags, fixed->fixed_rate);
break;
}
default:
clk = ERR_PTR(-EINVAL);
}
return clk;
}
static void __init lpc32xx_clk_init(struct device_node *np)
{
unsigned int i;
struct clk *clk_osc, *clk_32k;
void __iomem *base = NULL;
/* Ensure that parent clocks are available and valid */
clk_32k = of_clk_get_by_name(np, clk_proto[LPC32XX_CLK_XTAL_32K].name);
if (IS_ERR(clk_32k)) {
pr_err("failed to find external 32KHz clock: %ld\n",
PTR_ERR(clk_32k));
return;
}
if (clk_get_rate(clk_32k) != 32768) {
pr_err("invalid clock rate of external 32KHz oscillator");
return;
}
clk_osc = of_clk_get_by_name(np, clk_proto[LPC32XX_CLK_XTAL].name);
if (IS_ERR(clk_osc)) {
pr_err("failed to find external main oscillator clock: %ld\n",
PTR_ERR(clk_osc));
return;
}
base = of_iomap(np, 0);
if (!base) {
pr_err("failed to map system control block registers\n");
return;
}
clk_regmap = regmap_init_mmio(NULL, base, &lpc32xx_scb_regmap_config);
if (IS_ERR(clk_regmap)) {
pr_err("failed to regmap system control block: %ld\n",
PTR_ERR(clk_regmap));
return;
}
for (i = 0; i < LPC32XX_CLK_MAX; i++) {
clk[i] = lpc32xx_clk_register(i);
if (IS_ERR(clk[i])) {
pr_err("failed to register %s clock: %ld\n",
clk_proto[i].name, PTR_ERR(clk[i]));
clk[i] = NULL;
}
}
of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
/* For 13MHz osc valid output range of PLL is from 156MHz to 266.5MHz */
clk_set_rate(clk[LPC32XX_CLK_HCLK_PLL], 208000000);
/* Set 48MHz rate of USB PLL clock */
clk_set_rate(clk[LPC32XX_CLK_USB_PLL], 48000000);
/* These two clocks must be always on independently on consumers */
clk_prepare_enable(clk[LPC32XX_CLK_ARM]);
clk_prepare_enable(clk[LPC32XX_CLK_HCLK]);
/* Enable ARM VFP by default */
clk_prepare_enable(clk[LPC32XX_CLK_ARM_VFP]);
/* Disable enabled by default clocks for NAND MLC and SLC */
clk_mask_disable(&clk_hw_proto[LPC32XX_CLK_SLC].hw0.clk.hw);
clk_mask_disable(&clk_hw_proto[LPC32XX_CLK_MLC].hw0.clk.hw);
}
CLK_OF_DECLARE(lpc32xx_clk, "nxp,lpc3220-clk", lpc32xx_clk_init);
static void __init lpc32xx_usb_clk_init(struct device_node *np)
{
unsigned int i;
usb_clk_vbase = of_iomap(np, 0);
if (!usb_clk_vbase) {
pr_err("failed to map address range\n");
return;
}
for (i = 0; i < LPC32XX_USB_CLK_MAX; i++) {
usb_clk[i] = lpc32xx_clk_register(i + LPC32XX_CLK_USB_OFFSET);
if (IS_ERR(usb_clk[i])) {
pr_err("failed to register %s clock: %ld\n",
clk_proto[i].name, PTR_ERR(usb_clk[i]));
usb_clk[i] = NULL;
}
}
of_clk_add_provider(np, of_clk_src_onecell_get, &usb_clk_data);
}
CLK_OF_DECLARE(lpc32xx_usb_clk, "nxp,lpc3220-usb-clk", lpc32xx_usb_clk_init);
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