diff options
Diffstat (limited to 'arch/arm/mach-s5p6440/clock.c')
| -rw-r--r-- | arch/arm/mach-s5p6440/clock.c | 698 |
1 files changed, 698 insertions, 0 deletions
diff --git a/arch/arm/mach-s5p6440/clock.c b/arch/arm/mach-s5p6440/clock.c new file mode 100644 index 00000000000..b2672e16e7a --- /dev/null +++ b/arch/arm/mach-s5p6440/clock.c @@ -0,0 +1,698 @@ +/* linux/arch/arm/mach-s5p6440/clock.c + * + * Copyright (c) 2009 Samsung Electronics Co., Ltd. + * http://www.samsung.com/ + * + * S5P6440 - Clock support + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/sysdev.h> +#include <linux/io.h> + +#include <mach/hardware.h> +#include <mach/map.h> + +#include <plat/cpu-freq.h> +#include <mach/regs-clock.h> +#include <plat/clock.h> +#include <plat/cpu.h> +#include <plat/clock-clksrc.h> +#include <plat/s5p-clock.h> +#include <plat/pll.h> +#include <plat/s5p6440.h> + +/* APLL Mux output clock */ +static struct clksrc_clk clk_mout_apll = { + .clk = { + .name = "mout_apll", + .id = -1, + }, + .sources = &clk_src_apll, + .reg_src = { .reg = S5P_CLK_SRC0, .shift = 0, .size = 1 }, +}; + +static int s5p6440_epll_enable(struct clk *clk, int enable) +{ + unsigned int ctrlbit = clk->ctrlbit; + unsigned int epll_con = __raw_readl(S5P_EPLL_CON) & ~ctrlbit; + + if (enable) + __raw_writel(epll_con | ctrlbit, S5P_EPLL_CON); + else + __raw_writel(epll_con, S5P_EPLL_CON); + + return 0; +} + +static unsigned long s5p6440_epll_get_rate(struct clk *clk) +{ + return clk->rate; +} + +static u32 epll_div[][5] = { + { 36000000, 0, 48, 1, 4 }, + { 48000000, 0, 32, 1, 3 }, + { 60000000, 0, 40, 1, 3 }, + { 72000000, 0, 48, 1, 3 }, + { 84000000, 0, 28, 1, 2 }, + { 96000000, 0, 32, 1, 2 }, + { 32768000, 45264, 43, 1, 4 }, + { 45158000, 6903, 30, 1, 3 }, + { 49152000, 50332, 32, 1, 3 }, + { 67738000, 10398, 45, 1, 3 }, + { 73728000, 9961, 49, 1, 3 } +}; + +static int s5p6440_epll_set_rate(struct clk *clk, unsigned long rate) +{ + unsigned int epll_con, epll_con_k; + unsigned int i; + + if (clk->rate == rate) /* Return if nothing changed */ + return 0; + + epll_con = __raw_readl(S5P_EPLL_CON); + epll_con_k = __raw_readl(S5P_EPLL_CON_K); + + epll_con_k &= ~(PLL90XX_KDIV_MASK); + epll_con &= ~(PLL90XX_MDIV_MASK | PLL90XX_PDIV_MASK | PLL90XX_SDIV_MASK); + + for (i = 0; i < ARRAY_SIZE(epll_div); i++) { + if (epll_div[i][0] == rate) { + epll_con_k |= (epll_div[i][1] << PLL90XX_KDIV_SHIFT); + epll_con |= (epll_div[i][2] << PLL90XX_MDIV_SHIFT) | + (epll_div[i][3] << PLL90XX_PDIV_SHIFT) | + (epll_div[i][4] << PLL90XX_SDIV_SHIFT); + break; + } + } + + if (i == ARRAY_SIZE(epll_div)) { + printk(KERN_ERR "%s: Invalid Clock EPLL Frequency\n", __func__); + return -EINVAL; + } + + __raw_writel(epll_con, S5P_EPLL_CON); + __raw_writel(epll_con_k, S5P_EPLL_CON_K); + + clk->rate = rate; + + return 0; +} + +static struct clk_ops s5p6440_epll_ops = { + .get_rate = s5p6440_epll_get_rate, + .set_rate = s5p6440_epll_set_rate, +}; + +static struct clksrc_clk clk_mout_epll = { + .clk = { + .name = "mout_epll", + .id = -1, + }, + .sources = &clk_src_epll, + .reg_src = { .reg = S5P_CLK_SRC0, .shift = 2, .size = 1 }, +}; + +static struct clksrc_clk clk_mout_mpll = { + .clk = { + .name = "mout_mpll", + .id = -1, + }, + .sources = &clk_src_mpll, + .reg_src = { .reg = S5P_CLK_SRC0, .shift = 1, .size = 1 }, +}; + +static struct clk clk_h_low = { + .name = "hclk_low", + .id = -1, + .rate = 0, + .parent = NULL, + .ctrlbit = 0, + .ops = &clk_ops_def_setrate, +}; + +static struct clk clk_p_low = { + .name = "pclk_low", + .id = -1, + .rate = 0, + .parent = NULL, + .ctrlbit = 0, + .ops = &clk_ops_def_setrate, +}; + +enum perf_level { + L0 = 532*1000, + L1 = 266*1000, + L2 = 133*1000, +}; + +static const u32 clock_table[][3] = { + /*{ARM_CLK, DIVarm, DIVhclk}*/ + {L0 * 1000, (0 << ARM_DIV_RATIO_SHIFT), (3 << S5P_CLKDIV0_HCLK_SHIFT)}, + {L1 * 1000, (1 << ARM_DIV_RATIO_SHIFT), (1 << S5P_CLKDIV0_HCLK_SHIFT)}, + {L2 * 1000, (3 << ARM_DIV_RATIO_SHIFT), (0 << S5P_CLKDIV0_HCLK_SHIFT)}, +}; + +static unsigned long s5p6440_armclk_get_rate(struct clk *clk) +{ + unsigned long rate = clk_get_rate(clk->parent); + u32 clkdiv; + + /* divisor mask starts at bit0, so no need to shift */ + clkdiv = __raw_readl(ARM_CLK_DIV) & ARM_DIV_MASK; + + return rate / (clkdiv + 1); +} + +static unsigned long s5p6440_armclk_round_rate(struct clk *clk, + unsigned long rate) +{ + u32 iter; + + for (iter = 1 ; iter < ARRAY_SIZE(clock_table) ; iter++) { + if (rate > clock_table[iter][0]) + return clock_table[iter-1][0]; + } + + return clock_table[ARRAY_SIZE(clock_table) - 1][0]; +} + +static int s5p6440_armclk_set_rate(struct clk *clk, unsigned long rate) +{ + u32 round_tmp; + u32 iter; + u32 clk_div0_tmp; + u32 cur_rate = clk->ops->get_rate(clk); + unsigned long flags; + + round_tmp = clk->ops->round_rate(clk, rate); + if (round_tmp == cur_rate) + return 0; + + + for (iter = 0 ; iter < ARRAY_SIZE(clock_table) ; iter++) { + if (round_tmp == clock_table[iter][0]) + break; + } + + if (iter >= ARRAY_SIZE(clock_table)) + iter = ARRAY_SIZE(clock_table) - 1; + + local_irq_save(flags); + if (cur_rate > round_tmp) { + /* Frequency Down */ + clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK); + clk_div0_tmp |= clock_table[iter][1]; + __raw_writel(clk_div0_tmp, ARM_CLK_DIV); + + clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & + ~(S5P_CLKDIV0_HCLK_MASK); + clk_div0_tmp |= clock_table[iter][2]; + __raw_writel(clk_div0_tmp, ARM_CLK_DIV); + + + } else { + /* Frequency Up */ + clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & + ~(S5P_CLKDIV0_HCLK_MASK); + clk_div0_tmp |= clock_table[iter][2]; + __raw_writel(clk_div0_tmp, ARM_CLK_DIV); + + clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK); + clk_div0_tmp |= clock_table[iter][1]; + __raw_writel(clk_div0_tmp, ARM_CLK_DIV); + } + local_irq_restore(flags); + + clk->rate = clock_table[iter][0]; + + return 0; +} + +static struct clk_ops s5p6440_clkarm_ops = { + .get_rate = s5p6440_armclk_get_rate, + .set_rate = s5p6440_armclk_set_rate, + .round_rate = s5p6440_armclk_round_rate, +}; + +static unsigned long s5p6440_clk_doutmpll_get_rate(struct clk *clk) +{ + unsigned long rate = clk_get_rate(clk->parent); + + if (__raw_readl(S5P_CLK_DIV0) & S5P_CLKDIV0_MPLL_MASK) + rate /= 2; + + return rate; +} + +static struct clk clk_dout_mpll = { + .name = "dout_mpll", + .id = -1, + .parent = &clk_mout_mpll.clk, + .ops = &(struct clk_ops) { + .get_rate = s5p6440_clk_doutmpll_get_rate, + }, +}; + +int s5p6440_clk48m_ctrl(struct clk *clk, int enable) +{ + unsigned long flags; + u32 val; + + /* can't rely on clock lock, this register has other usages */ + local_irq_save(flags); + + val = __raw_readl(S5P_OTHERS); + if (enable) + val |= S5P_OTHERS_USB_SIG_MASK; + else + val &= ~S5P_OTHERS_USB_SIG_MASK; + + __raw_writel(val, S5P_OTHERS); + + local_irq_restore(flags); + + return 0; +} + +static int s5p6440_pclk_ctrl(struct clk *clk, int enable) +{ + return s5p_gatectrl(S5P_CLK_GATE_PCLK, clk, enable); +} + +static int s5p6440_hclk0_ctrl(struct clk *clk, int enable) +{ + return s5p_gatectrl(S5P_CLK_GATE_HCLK0, clk, enable); +} + +static int s5p6440_hclk1_ctrl(struct clk *clk, int enable) +{ + return s5p_gatectrl(S5P_CLK_GATE_HCLK1, clk, enable); +} + +static int s5p6440_sclk_ctrl(struct clk *clk, int enable) +{ + return s5p_gatectrl(S5P_CLK_GATE_SCLK0, clk, enable); +} + +static int s5p6440_mem_ctrl(struct clk *clk, int enable) +{ + return s5p_gatectrl(S5P_CLK_GATE_MEM0, clk, enable); +} + +/* + * The following clocks will be disabled during clock initialization. It is + * recommended to keep the following clocks disabled until the driver requests + * for enabling the clock. + */ +static struct clk init_clocks_disable[] = { + { + .name = "nand", + .id = -1, + .parent = &clk_h, + .enable = s5p6440_mem_ctrl, + .ctrlbit = S5P_CLKCON_MEM0_HCLK_NFCON, + }, { + .name = "adc", + .id = -1, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_TSADC, + }, { + .name = "i2c", + .id = -1, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_IIC0, + }, { + .name = "i2s_v40", + .id = 0, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_IIS2, + }, { + .name = "spi", + .id = 0, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_SPI0, + }, { + .name = "spi", + .id = 1, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_SPI1, + }, { + .name = "sclk_spi_48", + .id = 0, + .parent = &clk_48m, + .enable = s5p6440_sclk_ctrl, + .ctrlbit = S5P_CLKCON_SCLK0_SPI0_48, + }, { + .name = "sclk_spi_48", + .id = 1, + .parent = &clk_48m, + .enable = s5p6440_sclk_ctrl, + .ctrlbit = S5P_CLKCON_SCLK0_SPI1_48, + }, { + .name = "mmc_48m", + .id = 0, + .parent = &clk_48m, + .enable = s5p6440_sclk_ctrl, + .ctrlbit = S5P_CLKCON_SCLK0_MMC0_48, + }, { + .name = "mmc_48m", + .id = 1, + .parent = &clk_48m, + .enable = s5p6440_sclk_ctrl, + .ctrlbit = S5P_CLKCON_SCLK0_MMC1_48, + }, { + .name = "mmc_48m", + .id = 2, + .parent = &clk_48m, + .enable = s5p6440_sclk_ctrl, + .ctrlbit = S5P_CLKCON_SCLK0_MMC2_48, + }, { + .name = "otg", + .id = -1, + .parent = &clk_h_low, + .enable = s5p6440_hclk0_ctrl, + .ctrlbit = S5P_CLKCON_HCLK0_USB + }, { + .name = "post", + .id = -1, + .parent = &clk_h_low, + .enable = s5p6440_hclk0_ctrl, + .ctrlbit = S5P_CLKCON_HCLK0_POST0 + }, { + .name = "lcd", + .id = -1, + .parent = &clk_h_low, + .enable = s5p6440_hclk1_ctrl, + .ctrlbit = S5P_CLKCON_HCLK1_DISPCON, + }, { + .name = "hsmmc", + .id = 0, + .parent = &clk_h_low, + .enable = s5p6440_hclk0_ctrl, + .ctrlbit = S5P_CLKCON_HCLK0_HSMMC0, + }, { + .name = "hsmmc", + .id = 1, + .parent = &clk_h_low, + .enable = s5p6440_hclk0_ctrl, + .ctrlbit = S5P_CLKCON_HCLK0_HSMMC1, + }, { + .name = "hsmmc", + .id = 2, + .parent = &clk_h_low, + .enable = s5p6440_hclk0_ctrl, + .ctrlbit = S5P_CLKCON_HCLK0_HSMMC2, + }, { + .name = "rtc", + .id = -1, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_RTC, + }, { + .name = "watchdog", + .id = -1, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_WDT, + }, { + .name = "timers", + .id = -1, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_PWM, + } +}; + +/* + * The following clocks will be enabled during clock initialization. + */ +static struct clk init_clocks[] = { + { + .name = "gpio", + .id = -1, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_GPIO, + }, { + .name = "uart", + .id = 0, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_UART0, + }, { + .name = "uart", + .id = 1, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_UART1, + }, { + .name = "uart", + .id = 2, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_UART2, + }, { + .name = "uart", + .id = 3, + .parent = &clk_p_low, + .enable = s5p6440_pclk_ctrl, + .ctrlbit = S5P_CLKCON_PCLK_UART3, + } +}; + +static struct clk clk_iis_cd_v40 = { + .name = "iis_cdclk_v40", + .id = -1, +}; + +static struct clk clk_pcm_cd = { + .name = "pcm_cdclk", + .id = -1, +}; + +static struct clk *clkset_spi_mmc_list[] = { + &clk_mout_epll.clk, + &clk_dout_mpll, + &clk_fin_epll, +}; + +static struct clksrc_sources clkset_spi_mmc = { + .sources = clkset_spi_mmc_list, + .nr_sources = ARRAY_SIZE(clkset_spi_mmc_list), +}; + +static struct clk *clkset_uart_list[] = { + &clk_mout_epll.clk, + &clk_dout_mpll +}; + +static struct clksrc_sources clkset_uart = { + .sources = clkset_uart_list, + .nr_sources = ARRAY_SIZE(clkset_uart_list), +}; + +static struct clksrc_clk clksrcs[] = { + { + .clk = { + .name = "mmc_bus", + .id = 0, + .ctrlbit = S5P_CLKCON_SCLK0_MMC0, + .enable = s5p6440_sclk_ctrl, + }, + .sources = &clkset_spi_mmc, + .reg_src = { .reg = S5P_CLK_SRC0, .shift = 18, .size = 2 }, + .reg_div = { .reg = S5P_CLK_DIV1, .shift = 0, .size = 4 }, + }, { + .clk = { + .name = "mmc_bus", + .id = 1, + .ctrlbit = S5P_CLKCON_SCLK0_MMC1, + .enable = s5p6440_sclk_ctrl, + }, + .sources = &clkset_spi_mmc, + .reg_src = { .reg = S5P_CLK_SRC0, .shift = 20, .size = 2 }, + .reg_div = { .reg = S5P_CLK_DIV1, .shift = 4, .size = 4 }, + }, { + .clk = { + .name = "mmc_bus", + .id = 2, + .ctrlbit = S5P_CLKCON_SCLK0_MMC2, + .enable = s5p6440_sclk_ctrl, + }, + .sources = &clkset_spi_mmc, + .reg_src = { .reg = S5P_CLK_SRC0, .shift = 22, .size = 2 }, + .reg_div = { .reg = S5P_CLK_DIV1, .shift = 8, .size = 4 }, + }, { + .clk = { + .name = "uclk1", + .id = -1, + .ctrlbit = S5P_CLKCON_SCLK0_UART, + .enable = s5p6440_sclk_ctrl, + }, + .sources = &clkset_uart, + .reg_src = { .reg = S5P_CLK_SRC0, .shift = 13, .size = 1 }, + .reg_div = { .reg = S5P_CLK_DIV2, .shift = 16, .size = 4 }, + }, { + .clk = { + .name = "spi_epll", + .id = 0, + .ctrlbit = S5P_CLKCON_SCLK0_SPI0, + .enable = s5p6440_sclk_ctrl, + }, + .sources = &clkset_spi_mmc, + .reg_src = { .reg = S5P_CLK_SRC0, .shift = 14, .size = 2 }, + .reg_div = { .reg = S5P_CLK_DIV2, .shift = 0, .size = 4 }, + }, { + .clk = { + .name = "spi_epll", + .id = 1, + .ctrlbit = S5P_CLKCON_SCLK0_SPI1, + .enable = s5p6440_sclk_ctrl, + }, + .sources = &clkset_spi_mmc, + .reg_src = { .reg = S5P_CLK_SRC0, .shift = 16, .size = 2 }, + .reg_div = { .reg = S5P_CLK_DIV2, .shift = 4, .size = 4 }, + } +}; + +/* Clock initialisation code */ +static struct clksrc_clk *init_parents[] = { + &clk_mout_apll, + &clk_mout_epll, + &clk_mout_mpll, +}; + +void __init_or_cpufreq s5p6440_setup_clocks(void) +{ + struct clk *xtal_clk; + unsigned long xtal; + unsigned long fclk; + unsigned long hclk; + unsigned long hclk_low; + unsigned long pclk; + unsigned long pclk_low; + unsigned long epll; + unsigned long apll; + unsigned long mpll; + unsigned int ptr; + u32 clkdiv0; + u32 clkdiv3; + + /* Set S5P6440 functions for clk_fout_epll */ + clk_fout_epll.enable = s5p6440_epll_enable; + clk_fout_epll.ops = &s5p6440_epll_ops; + + /* Set S5P6440 functions for arm clock */ + clk_arm.parent = &clk_mout_apll.clk; + clk_arm.ops = &s5p6440_clkarm_ops; + clk_48m.enable = s5p6440_clk48m_ctrl; + + clkdiv0 = __raw_readl(S5P_CLK_DIV0); + clkdiv3 = __raw_readl(S5P_CLK_DIV3); + + xtal_clk = clk_get(NULL, "ext_xtal"); + BUG_ON(IS_ERR(xtal_clk)); + + xtal = clk_get_rate(xtal_clk); + clk_put(xtal_clk); + + epll = s5p_get_pll90xx(xtal, __raw_readl(S5P_EPLL_CON), + __raw_readl(S5P_EPLL_CON_K)); + mpll = s5p_get_pll45xx(xtal, __raw_readl(S5P_MPLL_CON), pll_4502); + apll = s5p_get_pll45xx(xtal, __raw_readl(S5P_APLL_CON), pll_4502); + + printk(KERN_INFO "S5P6440: PLL settings, A=%ld.%ldMHz, M=%ld.%ldMHz," \ + " E=%ld.%ldMHz\n", + print_mhz(apll), print_mhz(mpll), print_mhz(epll)); + + fclk = apll / GET_DIV(clkdiv0, S5P_CLKDIV0_ARM); + hclk = fclk / GET_DIV(clkdiv0, S5P_CLKDIV0_HCLK); + pclk = hclk / GET_DIV(clkdiv0, S5P_CLKDIV0_PCLK); + + if (__raw_readl(S5P_OTHERS) & S5P_OTHERS_HCLK_LOW_SEL_MPLL) { + /* Asynchronous mode */ + hclk_low = mpll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW); + } else { + /* Synchronous mode */ + hclk_low = apll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW); + } + + pclk_low = hclk_low / GET_DIV(clkdiv3, S5P_CLKDIV3_PCLK_LOW); + + printk(KERN_INFO "S5P6440: HCLK=%ld.%ldMHz, HCLK_LOW=%ld.%ldMHz," \ + " PCLK=%ld.%ldMHz, PCLK_LOW=%ld.%ldMHz\n", + print_mhz(hclk), print_mhz(hclk_low), + print_mhz(pclk), print_mhz(pclk_low)); + + clk_fout_mpll.rate = mpll; + clk_fout_epll.rate = epll; + clk_fout_apll.rate = apll; + + clk_f.rate = fclk; + clk_h.rate = hclk; + clk_p.rate = pclk; + clk_h_low.rate = hclk_low; + clk_p_low.rate = pclk_low; + + for (ptr = 0; ptr < ARRAY_SIZE(init_parents); ptr++) + s3c_set_clksrc(init_parents[ptr], true); + + for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++) + s3c_set_clksrc(&clksrcs[ptr], true); +} + +static struct clk *clks[] __initdata = { + &clk_ext, + &clk_mout_epll.clk, + &clk_mout_mpll.clk, + &clk_dout_mpll, + &clk_iis_cd_v40, + &clk_pcm_cd, + &clk_p_low, + &clk_h_low, +}; + +void __init s5p6440_register_clocks(void) +{ + struct clk *clkp; + int ret; + int ptr; + + ret = s3c24xx_register_clocks(clks, ARRAY_SIZE(clks)); + if (ret > 0) + printk(KERN_ERR "Failed to register %u clocks\n", ret); + + s3c_register_clksrc(clksrcs, ARRAY_SIZE(clksrcs)); + s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks)); + + clkp = init_clocks_disable; + for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) { + + ret = s3c24xx_register_clock(clkp); + if (ret < 0) { + printk(KERN_ERR "Failed to register clock %s (%d)\n", + clkp->name, ret); + } + (clkp->enable)(clkp, 0); + } + + s3c_pwmclk_init(); +} |