diff options
Diffstat (limited to 'drivers/clk/clk-hsdk-cgu.c')
| -rw-r--r-- | drivers/clk/clk-hsdk-cgu.c | 564 |
1 files changed, 564 insertions, 0 deletions
diff --git a/drivers/clk/clk-hsdk-cgu.c b/drivers/clk/clk-hsdk-cgu.c new file mode 100644 index 0000000000..c80f90ec2f --- /dev/null +++ b/drivers/clk/clk-hsdk-cgu.c @@ -0,0 +1,564 @@ +/* + * Synopsys HSDK SDP CGU clock driver + * + * Copyright (C) 2017 Synopsys + * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <common.h> +#include <clk-uclass.h> +#include <div64.h> +#include <dm.h> +#include <linux/io.h> + +/* + * Synopsys ARC HSDK clock tree. + * + * ------------------ + * | 33.33 MHz xtal | + * ------------------ + * | + * | ----------- + * |-->| ARC PLL | + * | ----------- + * | | + * | |-->|CGU_ARC_IDIV|-----------> + * | |-->|CREG_CORE_IF_DIV|-------> + * | + * | -------------- + * |-->| SYSTEM PLL | + * | -------------- + * | | + * | |-->|CGU_SYS_IDIV_APB|-------> + * | |-->|CGU_SYS_IDIV_AXI|-------> + * | |-->|CGU_SYS_IDIV_*|---------> + * | |-->|CGU_SYS_IDIV_EBI_REF|---> + * | + * | -------------- + * |-->| TUNNEL PLL | + * | -------------- + * | | + * | |-->|CGU_TUN_IDIV|-----------> + * | + * | ------------ + * |-->| HDMI PLL | + * | ------------ + * | | + * | |-->|CGU_HDMI_IDIV_APB|------> + * | + * | ----------- + * |-->| DDR PLL | + * ----------- + * | + * |----------------------------> + */ + +DECLARE_GLOBAL_DATA_PTR; + +#define CGU_ARC_IDIV 0x080 +#define CGU_TUN_IDIV 0x380 +#define CGU_HDMI_IDIV_APB 0x480 +#define CGU_SYS_IDIV_APB 0x180 +#define CGU_SYS_IDIV_AXI 0x190 +#define CGU_SYS_IDIV_ETH 0x1A0 +#define CGU_SYS_IDIV_USB 0x1B0 +#define CGU_SYS_IDIV_SDIO 0x1C0 +#define CGU_SYS_IDIV_HDMI 0x1D0 +#define CGU_SYS_IDIV_GFX_CORE 0x1E0 +#define CGU_SYS_IDIV_GFX_DMA 0x1F0 +#define CGU_SYS_IDIV_GFX_CFG 0x200 +#define CGU_SYS_IDIV_DMAC_CORE 0x210 +#define CGU_SYS_IDIV_DMAC_CFG 0x220 +#define CGU_SYS_IDIV_SDIO_REF 0x230 +#define CGU_SYS_IDIV_SPI_REF 0x240 +#define CGU_SYS_IDIV_I2C_REF 0x250 +#define CGU_SYS_IDIV_UART_REF 0x260 +#define CGU_SYS_IDIV_EBI_REF 0x270 + +#define CGU_IDIV_MASK 0xFF /* All idiv have 8 significant bits */ + +#define CGU_ARC_PLL 0x0 +#define CGU_SYS_PLL 0x10 +#define CGU_DDR_PLL 0x20 +#define CGU_TUN_PLL 0x30 +#define CGU_HDMI_PLL 0x40 + +#define CGU_PLL_CTRL 0x000 /* ARC PLL control register */ +#define CGU_PLL_STATUS 0x004 /* ARC PLL status register */ +#define CGU_PLL_FMEAS 0x008 /* ARC PLL frequency measurement register */ +#define CGU_PLL_MON 0x00C /* ARC PLL monitor register */ + +#define CGU_PLL_CTRL_ODIV_SHIFT 2 +#define CGU_PLL_CTRL_IDIV_SHIFT 4 +#define CGU_PLL_CTRL_FBDIV_SHIFT 9 +#define CGU_PLL_CTRL_BAND_SHIFT 20 + +#define CGU_PLL_CTRL_ODIV_MASK GENMASK(3, CGU_PLL_CTRL_ODIV_SHIFT) +#define CGU_PLL_CTRL_IDIV_MASK GENMASK(8, CGU_PLL_CTRL_IDIV_SHIFT) +#define CGU_PLL_CTRL_FBDIV_MASK GENMASK(15, CGU_PLL_CTRL_FBDIV_SHIFT) + +#define CGU_PLL_CTRL_PD BIT(0) +#define CGU_PLL_CTRL_BYPASS BIT(1) + +#define CGU_PLL_STATUS_LOCK BIT(0) +#define CGU_PLL_STATUS_ERR BIT(1) + +#define HSDK_PLL_MAX_LOCK_TIME 100 /* 100 us */ + +#define CREG_CORE_IF_DIV 0x000 /* ARC CORE interface divider */ +#define CORE_IF_CLK_THRESHOLD_HZ 500000000 +#define CREG_CORE_IF_CLK_DIV_1 0x0 +#define CREG_CORE_IF_CLK_DIV_2 0x1 + +#define PARENT_RATE 33333333 /* fixed clock - xtal */ +#define CGU_MAX_CLOCKS 24 + +struct hsdk_pll_cfg { + u32 rate; + u32 idiv; + u32 fbdiv; + u32 odiv; + u32 band; +}; + +static const struct hsdk_pll_cfg asdt_pll_cfg[] = { + { 100000000, 0, 11, 3, 0 }, + { 125000000, 0, 14, 3, 0 }, + { 133000000, 0, 15, 3, 0 }, + { 150000000, 0, 17, 3, 0 }, + { 200000000, 1, 47, 3, 0 }, + { 233000000, 1, 27, 2, 0 }, + { 300000000, 1, 35, 2, 0 }, + { 333000000, 1, 39, 2, 0 }, + { 400000000, 1, 47, 2, 0 }, + { 500000000, 0, 14, 1, 0 }, + { 600000000, 0, 17, 1, 0 }, + { 700000000, 0, 20, 1, 0 }, + { 800000000, 0, 23, 1, 0 }, + { 900000000, 1, 26, 0, 0 }, + { 1000000000, 1, 29, 0, 0 }, + { 1100000000, 1, 32, 0, 0 }, + { 1200000000, 1, 35, 0, 0 }, + { 1300000000, 1, 38, 0, 0 }, + { 1400000000, 1, 41, 0, 0 }, + { 1500000000, 1, 44, 0, 0 }, + { 1600000000, 1, 47, 0, 0 }, + {} +}; + +static const struct hsdk_pll_cfg hdmi_pll_cfg[] = { + { 297000000, 0, 21, 2, 0 }, + { 540000000, 0, 19, 1, 0 }, + { 594000000, 0, 21, 1, 0 }, + {} +}; + +struct hsdk_cgu_clk { + /* CGU block register */ + void __iomem *cgu_regs; + /* CREG block register */ + void __iomem *creg_regs; + + /* PLLs registers */ + void __iomem *regs; + /* PLLs special registers */ + void __iomem *spec_regs; + /* PLLs devdata */ + const struct hsdk_pll_devdata *pll_devdata; + + /* Dividers registers */ + void __iomem *idiv_regs; +}; + +struct hsdk_pll_devdata { + const struct hsdk_pll_cfg *pll_cfg; + int (*update_rate)(struct hsdk_cgu_clk *clk, unsigned long rate, + const struct hsdk_pll_cfg *cfg); +}; + +static int hsdk_pll_core_update_rate(struct hsdk_cgu_clk *, unsigned long, + const struct hsdk_pll_cfg *); +static int hsdk_pll_comm_update_rate(struct hsdk_cgu_clk *, unsigned long, + const struct hsdk_pll_cfg *); + +static const struct hsdk_pll_devdata core_pll_dat = { + .pll_cfg = asdt_pll_cfg, + .update_rate = hsdk_pll_core_update_rate, +}; + +static const struct hsdk_pll_devdata sdt_pll_dat = { + .pll_cfg = asdt_pll_cfg, + .update_rate = hsdk_pll_comm_update_rate, +}; + +static const struct hsdk_pll_devdata hdmi_pll_dat = { + .pll_cfg = hdmi_pll_cfg, + .update_rate = hsdk_pll_comm_update_rate, +}; + +static ulong idiv_set(struct clk *, ulong); +static ulong idiv_get(struct clk *); +static int idiv_off(struct clk *); +static ulong pll_set(struct clk *, ulong); +static ulong pll_get(struct clk *); + +struct hsdk_cgu_clock_map { + u32 cgu_pll_oft; + u32 creg_div_oft; + u32 cgu_div_oft; + const struct hsdk_pll_devdata *pll_devdata; + ulong (*get_rate)(struct clk *clk); + ulong (*set_rate)(struct clk *clk, ulong rate); + int (*disable)(struct clk *clk); +}; + +static const struct hsdk_cgu_clock_map clock_map[] = { + { CGU_ARC_PLL, 0, 0, &core_pll_dat, pll_get, pll_set, NULL }, + { CGU_ARC_PLL, 0, CGU_ARC_IDIV, &core_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_DDR_PLL, 0, 0, &sdt_pll_dat, pll_get, pll_set, NULL }, + { CGU_SYS_PLL, 0, 0, &sdt_pll_dat, pll_get, pll_set, NULL }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_APB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_AXI, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_ETH, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_USB, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_SDIO, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_HDMI, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_GFX_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_GFX_DMA, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_GFX_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_DMAC_CORE, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_DMAC_CFG, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_SDIO_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_SPI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_I2C_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_UART_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_SYS_PLL, 0, CGU_SYS_IDIV_EBI_REF, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_TUN_PLL, 0, 0, &sdt_pll_dat, pll_get, pll_set, NULL }, + { CGU_TUN_PLL, 0, CGU_TUN_IDIV, &sdt_pll_dat, idiv_get, idiv_set, idiv_off }, + { CGU_HDMI_PLL, 0, 0, &hdmi_pll_dat, pll_get, pll_set, NULL }, + { CGU_HDMI_PLL, 0, CGU_HDMI_IDIV_APB, &hdmi_pll_dat, idiv_get, idiv_set, idiv_off } +}; + +static inline void hsdk_idiv_write(struct hsdk_cgu_clk *clk, u32 val) +{ + iowrite32(val, clk->idiv_regs); +} + +static inline u32 hsdk_idiv_read(struct hsdk_cgu_clk *clk) +{ + return ioread32(clk->idiv_regs); +} + +static inline void hsdk_pll_write(struct hsdk_cgu_clk *clk, u32 reg, u32 val) +{ + iowrite32(val, clk->regs + reg); +} + +static inline u32 hsdk_pll_read(struct hsdk_cgu_clk *clk, u32 reg) +{ + return ioread32(clk->regs + reg); +} + +static inline void hsdk_pll_spcwrite(struct hsdk_cgu_clk *clk, u32 reg, u32 val) +{ + iowrite32(val, clk->spec_regs + reg); +} + +static inline u32 hsdk_pll_spcread(struct hsdk_cgu_clk *clk, u32 reg) +{ + return ioread32(clk->spec_regs + reg); +} + +static inline void hsdk_pll_set_cfg(struct hsdk_cgu_clk *clk, + const struct hsdk_pll_cfg *cfg) +{ + u32 val = 0; + + /* Powerdown and Bypass bits should be cleared */ + val |= cfg->idiv << CGU_PLL_CTRL_IDIV_SHIFT; + val |= cfg->fbdiv << CGU_PLL_CTRL_FBDIV_SHIFT; + val |= cfg->odiv << CGU_PLL_CTRL_ODIV_SHIFT; + val |= cfg->band << CGU_PLL_CTRL_BAND_SHIFT; + + pr_debug("write configurarion: %#x\n", val); + + hsdk_pll_write(clk, CGU_PLL_CTRL, val); +} + +static inline bool hsdk_pll_is_locked(struct hsdk_cgu_clk *clk) +{ + return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_LOCK); +} + +static inline bool hsdk_pll_is_err(struct hsdk_cgu_clk *clk) +{ + return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_ERR); +} + +static ulong pll_get(struct clk *sclk) +{ + u32 val; + u64 rate; + u32 idiv, fbdiv, odiv; + struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); + + val = hsdk_pll_read(clk, CGU_PLL_CTRL); + + pr_debug("current configurarion: %#x\n", val); + + /* Check if PLL is disabled */ + if (val & CGU_PLL_CTRL_PD) + return 0; + + /* Check if PLL is bypassed */ + if (val & CGU_PLL_CTRL_BYPASS) + return PARENT_RATE; + + /* input divider = reg.idiv + 1 */ + idiv = 1 + ((val & CGU_PLL_CTRL_IDIV_MASK) >> CGU_PLL_CTRL_IDIV_SHIFT); + /* fb divider = 2*(reg.fbdiv + 1) */ + fbdiv = 2 * (1 + ((val & CGU_PLL_CTRL_FBDIV_MASK) >> CGU_PLL_CTRL_FBDIV_SHIFT)); + /* output divider = 2^(reg.odiv) */ + odiv = 1 << ((val & CGU_PLL_CTRL_ODIV_MASK) >> CGU_PLL_CTRL_ODIV_SHIFT); + + rate = (u64)PARENT_RATE * fbdiv; + do_div(rate, idiv * odiv); + + return rate; +} + +static unsigned long hsdk_pll_round_rate(struct clk *sclk, unsigned long rate) +{ + int i; + unsigned long best_rate; + struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); + const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg; + + if (pll_cfg[0].rate == 0) + return -EINVAL; + + best_rate = pll_cfg[0].rate; + + for (i = 1; pll_cfg[i].rate != 0; i++) { + if (abs(rate - pll_cfg[i].rate) < abs(rate - best_rate)) + best_rate = pll_cfg[i].rate; + } + + pr_debug("chosen best rate: %lu\n", best_rate); + + return best_rate; +} + +static int hsdk_pll_comm_update_rate(struct hsdk_cgu_clk *clk, + unsigned long rate, + const struct hsdk_pll_cfg *cfg) +{ + hsdk_pll_set_cfg(clk, cfg); + + /* + * Wait until CGU relocks and check error status. + * If after timeout CGU is unlocked yet return error. + */ + udelay(HSDK_PLL_MAX_LOCK_TIME); + if (!hsdk_pll_is_locked(clk)) + return -ETIMEDOUT; + + if (hsdk_pll_is_err(clk)) + return -EINVAL; + + return 0; +} + +static int hsdk_pll_core_update_rate(struct hsdk_cgu_clk *clk, + unsigned long rate, + const struct hsdk_pll_cfg *cfg) +{ + /* + * When core clock exceeds 500MHz, the divider for the interface + * clock must be programmed to div-by-2. + */ + if (rate > CORE_IF_CLK_THRESHOLD_HZ) + hsdk_pll_spcwrite(clk, CREG_CORE_IF_DIV, CREG_CORE_IF_CLK_DIV_2); + + hsdk_pll_set_cfg(clk, cfg); + + /* + * Wait until CGU relocks and check error status. + * If after timeout CGU is unlocked yet return error. + */ + udelay(HSDK_PLL_MAX_LOCK_TIME); + if (!hsdk_pll_is_locked(clk)) + return -ETIMEDOUT; + + if (hsdk_pll_is_err(clk)) + return -EINVAL; + + /* + * Program divider to div-by-1 if we succesfuly set core clock below + * 500MHz threshold. + */ + if (rate <= CORE_IF_CLK_THRESHOLD_HZ) + hsdk_pll_spcwrite(clk, CREG_CORE_IF_DIV, CREG_CORE_IF_CLK_DIV_1); + + return 0; +} + +static ulong pll_set(struct clk *sclk, ulong rate) +{ + int i; + unsigned long best_rate; + struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); + const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg; + + best_rate = hsdk_pll_round_rate(sclk, rate); + + for (i = 0; pll_cfg[i].rate != 0; i++) { + if (pll_cfg[i].rate == best_rate) { + return clk->pll_devdata->update_rate(clk, best_rate, + &pll_cfg[i]); + } + } + + pr_err("invalid rate=%ld, parent_rate=%d\n", best_rate, PARENT_RATE); + + return -EINVAL; +} + +static int idiv_off(struct clk *sclk) +{ + struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); + + hsdk_idiv_write(clk, 0); + + return 0; +} + +static ulong idiv_get(struct clk *sclk) +{ + struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); + ulong parent_rate = pll_get(sclk); + u32 div_factor = hsdk_idiv_read(clk); + + div_factor &= CGU_IDIV_MASK; + + pr_debug("current configurarion: %#x (%d)\n", div_factor, div_factor); + + if (div_factor == 0) + return 0; + + return parent_rate / div_factor; +} + +static ulong idiv_set(struct clk *sclk, ulong rate) +{ + struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); + ulong parent_rate = pll_get(sclk); + u32 div_factor; + + div_factor = parent_rate / rate; + if (abs(rate - parent_rate / (div_factor + 1)) <= + abs(rate - parent_rate / div_factor)) { + div_factor += 1; + } + + if (div_factor & ~CGU_IDIV_MASK) { + pr_err("invalid rate=%ld, parent_rate=%ld, div=%d: max divider valie is%d\n", + rate, parent_rate, div_factor, CGU_IDIV_MASK); + + div_factor = CGU_IDIV_MASK; + } + + if (div_factor == 0) { + pr_err("invalid rate=%ld, parent_rate=%ld, div=%d: min divider valie is 1\n", + rate, parent_rate, div_factor); + + div_factor = 1; + } + + hsdk_idiv_write(clk, div_factor); + + return 0; +} + +static int hsdk_prepare_clock_tree_branch(struct clk *sclk) +{ + struct hsdk_cgu_clk *clk = dev_get_priv(sclk->dev); + + if (sclk->id >= CGU_MAX_CLOCKS) + return -EINVAL; + + clk->pll_devdata = clock_map[sclk->id].pll_devdata; + clk->regs = clk->cgu_regs + clock_map[sclk->id].cgu_pll_oft; + clk->spec_regs = clk->creg_regs + clock_map[sclk->id].creg_div_oft; + clk->idiv_regs = clk->cgu_regs + clock_map[sclk->id].cgu_div_oft; + + return 0; +} + +static ulong hsdk_cgu_get_rate(struct clk *sclk) +{ + if (hsdk_prepare_clock_tree_branch(sclk)) + return -EINVAL; + + return clock_map[sclk->id].get_rate(sclk); +} + +static ulong hsdk_cgu_set_rate(struct clk *sclk, ulong rate) +{ + if (hsdk_prepare_clock_tree_branch(sclk)) + return -EINVAL; + + return clock_map[sclk->id].set_rate(sclk, rate); +} + +static int hsdk_cgu_disable(struct clk *sclk) +{ + if (hsdk_prepare_clock_tree_branch(sclk)) + return -EINVAL; + + if (clock_map[sclk->id].disable) + return clock_map[sclk->id].disable(sclk); + + return -ENOTSUPP; +} + +static const struct clk_ops hsdk_cgu_ops = { + .set_rate = hsdk_cgu_set_rate, + .get_rate = hsdk_cgu_get_rate, + .disable = hsdk_cgu_disable, +}; + +static int hsdk_cgu_clk_probe(struct udevice *dev) +{ + struct hsdk_cgu_clk *pll_clk = dev_get_priv(dev); + + BUILD_BUG_ON(ARRAY_SIZE(clock_map) != CGU_MAX_CLOCKS); + + pll_clk->cgu_regs = (void __iomem *)devfdt_get_addr_index(dev, 0); + if (!pll_clk->cgu_regs) + return -EINVAL; + + pll_clk->creg_regs = (void __iomem *)devfdt_get_addr_index(dev, 1); + if (!pll_clk->creg_regs) + return -EINVAL; + + return 0; +} + +static const struct udevice_id hsdk_cgu_clk_id[] = { + { .compatible = "snps,hsdk-cgu-clock" }, + { } +}; + +U_BOOT_DRIVER(hsdk_cgu_clk) = { + .name = "hsdk-cgu-clk", + .id = UCLASS_CLK, + .of_match = hsdk_cgu_clk_id, + .probe = hsdk_cgu_clk_probe, + .platdata_auto_alloc_size = sizeof(struct hsdk_cgu_clk), + .ops = &hsdk_cgu_ops, +}; |