diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/clk/nxp/clk-lpc32xx.c | 1587 |
1 files changed, 1587 insertions, 0 deletions
diff --git a/drivers/clk/nxp/clk-lpc32xx.c b/drivers/clk/nxp/clk-lpc32xx.c new file mode 100644 index 000000000..d0f870eff --- /dev/null +++ b/drivers/clk/nxp/clk-lpc32xx.c @@ -0,0 +1,1587 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2015 Vladimir Zapolskiy <vz@mleia.com> + */ + +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/io.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 = { + .name = "scb", + .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_PERIPH + 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_DIV_PERIPH, + LPC32XX_CLK_HCLK_DIV, + LPC32XX_CLK_HCLK, + 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\n", + 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, o = rate, i = *parent_rate, d = (u64)rate << 6; + u64 m = 0, n = 0, p = 0; + 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 lpc32xx_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 lpc32xx_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 lpc32xx_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 = lpc32xx_clk_gate_enable, + .disable = lpc32xx_clk_gate_disable, + .is_enabled = lpc32xx_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, divider->width); +} + +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) \ +[CLK_PREFIX(_idx)] = { \ + .type = CLK_FIXED, \ + { \ + .f = { \ + .fixed_rate = (_rate), \ + }, \ + }, \ +} + +#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), + 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), + 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), + 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), + 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; + else + return ERR_PTR(-EINVAL); + + 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], 0, fixed->fixed_rate); + break; + } + default: + clk = ERR_PTR(-EINVAL); + } + + return clk; +} + +static void __init lpc32xx_clk_div_quirk(u32 reg, u32 div_mask, u32 gate) +{ + u32 val; + + regmap_read(clk_regmap, reg, &val); + + if (!(val & div_mask)) { + val &= ~gate; + val |= BIT(__ffs(div_mask)); + } + + regmap_update_bits(clk_regmap, reg, gate | div_mask, val); +} + +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\n"); + 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)); + iounmap(base); + return; + } + + /* + * Divider part of PWM and MS clocks requires a quirk to avoid + * a misinterpretation of formally valid zero value in register + * bitfield, which indicates another clock gate. Instead of + * adding complexity to a gate clock ensure that zero value in + * divider clock is never met in runtime. + */ + lpc32xx_clk_div_quirk(LPC32XX_CLKPWR_PWMCLK_CTRL, 0xf0, BIT(0)); + lpc32xx_clk_div_quirk(LPC32XX_CLKPWR_PWMCLK_CTRL, 0xf00, BIT(2)); + lpc32xx_clk_div_quirk(LPC32XX_CLKPWR_MS_CTRL, 0xf, BIT(5) | BIT(9)); + + for (i = 1; 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); + + /* 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 = 1; 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); |