diff options
Diffstat (limited to 'arch/arm/mach-s3c2443/clock.c')
| -rw-r--r-- | arch/arm/mach-s3c2443/clock.c | 513 |
1 files changed, 126 insertions, 387 deletions
diff --git a/arch/arm/mach-s3c2443/clock.c b/arch/arm/mach-s3c2443/clock.c index 5d061ea0c51..f89e71f5034 100644 --- a/arch/arm/mach-s3c2443/clock.c +++ b/arch/arm/mach-s3c2443/clock.c @@ -1,6 +1,6 @@ /* linux/arch/arm/mach-s3c2443/clock.c * - * Copyright (c) 2007 Simtec Electronics + * Copyright (c) 2007,2010 Simtec Electronics * Ben Dooks <ben@simtec.co.uk> * * S3C2443 Clock control support @@ -42,6 +42,7 @@ #include <plat/s3c2443.h> #include <plat/clock.h> +#include <plat/clock-clksrc.h> #include <plat/cpu.h> /* We currently have to assume that the system is running @@ -82,45 +83,7 @@ static int s3c2443_clkcon_enable_s(struct clk *clk, int enable) return s3c2443_gate(S3C2443_SCLKCON, clk, enable); } -static unsigned long s3c2443_roundrate_clksrc(struct clk *clk, - unsigned long rate, - unsigned int max) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - int div; - - if (rate > parent_rate) - return parent_rate; - - /* note, we remove the +/- 1 calculations as they cancel out */ - - div = (rate / parent_rate); - - if (div < 1) - div = 1; - else if (div > max) - div = max; - - return parent_rate / div; -} - -static unsigned long s3c2443_roundrate_clksrc4(struct clk *clk, - unsigned long rate) -{ - return s3c2443_roundrate_clksrc(clk, rate, 4); -} - -static unsigned long s3c2443_roundrate_clksrc16(struct clk *clk, - unsigned long rate) -{ - return s3c2443_roundrate_clksrc(clk, rate, 16); -} - -static unsigned long s3c2443_roundrate_clksrc256(struct clk *clk, - unsigned long rate) -{ - return s3c2443_roundrate_clksrc(clk, rate, 256); -} +/* s3c2443_roundate_clksrc is close enough to s3c_roundate_clksrc */ /* clock selections */ @@ -143,31 +106,23 @@ static struct clk clk_i2s_ext = { .id = -1, }; -static int s3c2443_setparent_epllref(struct clk *clk, struct clk *parent) -{ - unsigned long clksrc = __raw_readl(S3C2443_CLKSRC); - - clksrc &= ~S3C2443_CLKSRC_EPLLREF_MASK; - - if (parent == &clk_xtal) - clksrc |= S3C2443_CLKSRC_EPLLREF_XTAL; - else if (parent == &clk_ext) - clksrc |= S3C2443_CLKSRC_EPLLREF_EXTCLK; - else if (parent != &clk_mpllref) - return -EINVAL; - - __raw_writel(clksrc, S3C2443_CLKSRC); - clk->parent = parent; - - return 0; -} +static struct clk *clk_epllref_sources[] = { + [0] = &clk_mpllref, + [1] = &clk_mpllref, + [2] = &clk_xtal, + [3] = &clk_ext, +}; -static struct clk clk_epllref = { - .name = "epllref", - .id = -1, - .ops = &(struct clk_ops) { - .set_parent = s3c2443_setparent_epllref, +static struct clksrc_clk clk_epllref = { + .clk = { + .name = "epllref", + .id = -1, + }, + .sources = &(struct clksrc_sources) { + .sources = clk_epllref_sources, + .nr_sources = ARRAY_SIZE(clk_epllref_sources), }, + .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 7 }, }; static unsigned long s3c2443_getrate_mdivclk(struct clk *clk) @@ -273,7 +228,7 @@ static int s3c2443_setparent_esysclk(struct clk *clk, struct clk *parent) if (parent == &clk_epll) clksrc |= S3C2443_CLKSRC_ESYSCLK_EPLL; - else if (parent == &clk_epllref) + else if (parent == &clk_epllref.clk) clksrc &= ~S3C2443_CLKSRC_ESYSCLK_EPLL; else return -EINVAL; @@ -298,87 +253,30 @@ static struct clk clk_esysclk = { * UART baud-rate clock sourced from esysclk via a divisor */ -static unsigned long s3c2443_getrate_uart(struct clk *clk) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long div = __raw_readl(S3C2443_CLKDIV1); - - div &= S3C2443_CLKDIV1_UARTDIV_MASK; - div >>= S3C2443_CLKDIV1_UARTDIV_SHIFT; - - return parent_rate / (div + 1); -} - - -static int s3c2443_setrate_uart(struct clk *clk, unsigned long rate) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1); - - rate = s3c2443_roundrate_clksrc16(clk, rate); - rate = parent_rate / rate; - - clkdivn &= ~S3C2443_CLKDIV1_UARTDIV_MASK; - clkdivn |= (rate - 1) << S3C2443_CLKDIV1_UARTDIV_SHIFT; - - __raw_writel(clkdivn, S3C2443_CLKDIV1); - return 0; -} - -static struct clk clk_uart = { - .name = "uartclk", - .id = -1, - .parent = &clk_esysclk, - .ops = &(struct clk_ops) { - .get_rate = s3c2443_getrate_uart, - .set_rate = s3c2443_setrate_uart, - .round_rate = s3c2443_roundrate_clksrc16, +static struct clksrc_clk clk_uart = { + .clk = { + .name = "uartclk", + .id = -1, + .parent = &clk_esysclk, }, + .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 8 }, }; + /* hsspi * * high-speed spi clock, sourced from esysclk */ -static unsigned long s3c2443_getrate_hsspi(struct clk *clk) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long div = __raw_readl(S3C2443_CLKDIV1); - - div &= S3C2443_CLKDIV1_HSSPIDIV_MASK; - div >>= S3C2443_CLKDIV1_HSSPIDIV_SHIFT; - - return parent_rate / (div + 1); -} - - -static int s3c2443_setrate_hsspi(struct clk *clk, unsigned long rate) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1); - - rate = s3c2443_roundrate_clksrc4(clk, rate); - rate = parent_rate / rate; - - clkdivn &= ~S3C2443_CLKDIV1_HSSPIDIV_MASK; - clkdivn |= (rate - 1) << S3C2443_CLKDIV1_HSSPIDIV_SHIFT; - - __raw_writel(clkdivn, S3C2443_CLKDIV1); - return 0; -} - -static struct clk clk_hsspi = { - .name = "hsspi", - .id = -1, - .parent = &clk_esysclk, - .ctrlbit = S3C2443_SCLKCON_HSSPICLK, - .enable = s3c2443_clkcon_enable_s, - .ops = &(struct clk_ops) { - .get_rate = s3c2443_getrate_hsspi, - .set_rate = s3c2443_setrate_hsspi, - .round_rate = s3c2443_roundrate_clksrc4, +static struct clksrc_clk clk_hsspi = { + .clk = { + .name = "hsspi", + .id = -1, + .parent = &clk_esysclk, + .ctrlbit = S3C2443_SCLKCON_HSSPICLK, + .enable = s3c2443_clkcon_enable_s, }, + .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 4 }, }; /* usbhost @@ -386,43 +284,15 @@ static struct clk clk_hsspi = { * usb host bus-clock, usually 48MHz to provide USB bus clock timing */ -static unsigned long s3c2443_getrate_usbhost(struct clk *clk) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long div = __raw_readl(S3C2443_CLKDIV1); - - div &= S3C2443_CLKDIV1_USBHOSTDIV_MASK; - div >>= S3C2443_CLKDIV1_USBHOSTDIV_SHIFT; - - return parent_rate / (div + 1); -} - -static int s3c2443_setrate_usbhost(struct clk *clk, unsigned long rate) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1); - - rate = s3c2443_roundrate_clksrc4(clk, rate); - rate = parent_rate / rate; - - clkdivn &= ~S3C2443_CLKDIV1_USBHOSTDIV_MASK; - clkdivn |= (rate - 1) << S3C2443_CLKDIV1_USBHOSTDIV_SHIFT; - - __raw_writel(clkdivn, S3C2443_CLKDIV1); - return 0; -} - -static struct clk clk_usb_bus_host = { - .name = "usb-bus-host-parent", - .id = -1, - .parent = &clk_esysclk, - .ctrlbit = S3C2443_SCLKCON_USBHOST, - .enable = s3c2443_clkcon_enable_s, - .ops = &(struct clk_ops) { - .get_rate = s3c2443_getrate_usbhost, - .set_rate = s3c2443_setrate_usbhost, - .round_rate = s3c2443_roundrate_clksrc4, +static struct clksrc_clk clk_usb_bus_host = { + .clk = { + .name = "usb-bus-host-parent", + .id = -1, + .parent = &clk_esysclk, + .ctrlbit = S3C2443_SCLKCON_USBHOST, + .enable = s3c2443_clkcon_enable_s, }, + .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 4 }, }; /* clk_hsmcc_div @@ -432,41 +302,13 @@ static struct clk clk_usb_bus_host = { * be fed to the hsmmc block */ -static unsigned long s3c2443_getrate_hsmmc_div(struct clk *clk) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long div = __raw_readl(S3C2443_CLKDIV1); - - div &= S3C2443_CLKDIV1_HSMMCDIV_MASK; - div >>= S3C2443_CLKDIV1_HSMMCDIV_SHIFT; - - return parent_rate / (div + 1); -} - -static int s3c2443_setrate_hsmmc_div(struct clk *clk, unsigned long rate) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1); - - rate = s3c2443_roundrate_clksrc4(clk, rate); - rate = parent_rate / rate; - - clkdivn &= ~S3C2443_CLKDIV1_HSMMCDIV_MASK; - clkdivn |= (rate - 1) << S3C2443_CLKDIV1_HSMMCDIV_SHIFT; - - __raw_writel(clkdivn, S3C2443_CLKDIV1); - return 0; -} - -static struct clk clk_hsmmc_div = { - .name = "hsmmc-div", - .id = -1, - .parent = &clk_esysclk, - .ops = &(struct clk_ops) { - .get_rate = s3c2443_getrate_hsmmc_div, - .set_rate = s3c2443_setrate_hsmmc_div, - .round_rate = s3c2443_roundrate_clksrc4, +static struct clksrc_clk clk_hsmmc_div = { + .clk = { + .name = "hsmmc-div", + .id = -1, + .parent = &clk_esysclk, }, + .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 6 }, }; static int s3c2443_setparent_hsmmc(struct clk *clk, struct clk *parent) @@ -499,7 +341,7 @@ static int s3c2443_enable_hsmmc(struct clk *clk, int enable) static struct clk clk_hsmmc = { .name = "hsmmc-if", .id = -1, - .parent = &clk_hsmmc_div, + .parent = &clk_hsmmc_div.clk, .enable = s3c2443_enable_hsmmc, .ops = &(struct clk_ops) { .set_parent = s3c2443_setparent_hsmmc, @@ -508,79 +350,46 @@ static struct clk clk_hsmmc = { /* i2s_eplldiv * - * this clock is the output from the i2s divisor of esysclk + * This clock is the output from the I2S divisor of ESYSCLK, and is seperate + * from the mux that comes after it (cannot merge into one single clock) */ -static unsigned long s3c2443_getrate_i2s_eplldiv(struct clk *clk) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long div = __raw_readl(S3C2443_CLKDIV1); - - div &= S3C2443_CLKDIV1_I2SDIV_MASK; - div >>= S3C2443_CLKDIV1_I2SDIV_SHIFT; - - return parent_rate / (div + 1); -} - -static int s3c2443_setrate_i2s_eplldiv(struct clk *clk, unsigned long rate) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1); - - rate = s3c2443_roundrate_clksrc16(clk, rate); - rate = parent_rate / rate; - - clkdivn &= ~S3C2443_CLKDIV1_I2SDIV_MASK; - clkdivn |= (rate - 1) << S3C2443_CLKDIV1_I2SDIV_SHIFT; - - __raw_writel(clkdivn, S3C2443_CLKDIV1); - return 0; -} - -static struct clk clk_i2s_eplldiv = { - .name = "i2s-eplldiv", - .id = -1, - .parent = &clk_esysclk, - .ops = &(struct clk_ops) { - .get_rate = s3c2443_getrate_i2s_eplldiv, - .set_rate = s3c2443_setrate_i2s_eplldiv, - .round_rate = s3c2443_roundrate_clksrc16, +static struct clksrc_clk clk_i2s_eplldiv = { + .clk = { + .name = "i2s-eplldiv", + .id = -1, + .parent = &clk_esysclk, }, + .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 12, }, }; /* i2s-ref * * i2s bus reference clock, selectable from external, esysclk or epllref + * + * Note, this used to be two clocks, but was compressed into one. */ -static int s3c2443_setparent_i2s(struct clk *clk, struct clk *parent) -{ - unsigned long clksrc = __raw_readl(S3C2443_CLKSRC); - - clksrc &= ~S3C2443_CLKSRC_I2S_MASK; - - if (parent == &clk_epllref) - clksrc |= S3C2443_CLKSRC_I2S_EPLLREF; - else if (parent == &clk_i2s_ext) - clksrc |= S3C2443_CLKSRC_I2S_EXT; - else if (parent != &clk_i2s_eplldiv) - return -EINVAL; - - clk->parent = parent; - __raw_writel(clksrc, S3C2443_CLKSRC); +struct clk *clk_i2s_srclist[] = { + [0] = &clk_i2s_eplldiv.clk, + [1] = &clk_i2s_ext, + [2] = &clk_epllref.clk, + [3] = &clk_epllref.clk, +}; - return 0; -} +static struct clksrc_clk clk_i2s = { + .clk = { + .name = "i2s-if", + .id = -1, + .ctrlbit = S3C2443_SCLKCON_I2SCLK, + .enable = s3c2443_clkcon_enable_s, -static struct clk clk_i2s = { - .name = "i2s-if", - .id = -1, - .parent = &clk_i2s_eplldiv, - .ctrlbit = S3C2443_SCLKCON_I2SCLK, - .enable = s3c2443_clkcon_enable_s, - .ops = &(struct clk_ops) { - .set_parent = s3c2443_setparent_i2s, }, + .sources = &(struct clksrc_sources) { + .sources = clk_i2s_srclist, + .nr_sources = ARRAY_SIZE(clk_i2s_srclist), + }, + .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 14 }, }; /* cam-if @@ -588,43 +397,15 @@ static struct clk clk_i2s = { * camera interface bus-clock, divided down from esysclk */ -static unsigned long s3c2443_getrate_cam(struct clk *clk) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long div = __raw_readl(S3C2443_CLKDIV1); - - div &= S3C2443_CLKDIV1_CAMDIV_MASK; - div >>= S3C2443_CLKDIV1_CAMDIV_SHIFT; - - return parent_rate / (div + 1); -} - -static int s3c2443_setrate_cam(struct clk *clk, unsigned long rate) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long clkdiv1 = __raw_readl(S3C2443_CLKDIV1); - - rate = s3c2443_roundrate_clksrc16(clk, rate); - rate = parent_rate / rate; - - clkdiv1 &= ~S3C2443_CLKDIV1_CAMDIV_MASK; - clkdiv1 |= (rate - 1) << S3C2443_CLKDIV1_CAMDIV_SHIFT; - - __raw_writel(clkdiv1, S3C2443_CLKDIV1); - return 0; -} - -static struct clk clk_cam = { - .name = "camif-upll", /* same as 2440 name */ - .id = -1, - .parent = &clk_esysclk, - .ctrlbit = S3C2443_SCLKCON_CAMCLK, - .enable = s3c2443_clkcon_enable_s, - .ops = &(struct clk_ops) { - .get_rate = s3c2443_getrate_cam, - .set_rate = s3c2443_setrate_cam, - .round_rate = s3c2443_roundrate_clksrc16, +static struct clksrc_clk clk_cam = { + .clk = { + .name = "camif-upll", /* same as 2440 name */ + .id = -1, + .parent = &clk_esysclk, + .ctrlbit = S3C2443_SCLKCON_CAMCLK, + .enable = s3c2443_clkcon_enable_s, }, + .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 26 }, }; /* display-if @@ -632,43 +413,15 @@ static struct clk clk_cam = { * display interface clock, divided from esysclk */ -static unsigned long s3c2443_getrate_display(struct clk *clk) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long div = __raw_readl(S3C2443_CLKDIV1); - - div &= S3C2443_CLKDIV1_DISPDIV_MASK; - div >>= S3C2443_CLKDIV1_DISPDIV_SHIFT; - - return parent_rate / (div + 1); -} - -static int s3c2443_setrate_display(struct clk *clk, unsigned long rate) -{ - unsigned long parent_rate = clk_get_rate(clk->parent); - unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1); - - rate = s3c2443_roundrate_clksrc256(clk, rate); - rate = parent_rate / rate; - - clkdivn &= ~S3C2443_CLKDIV1_UARTDIV_MASK; - clkdivn |= (rate - 1) << S3C2443_CLKDIV1_UARTDIV_SHIFT; - - __raw_writel(clkdivn, S3C2443_CLKDIV1); - return 0; -} - -static struct clk clk_display = { - .name = "display-if", - .id = -1, - .parent = &clk_esysclk, - .ctrlbit = S3C2443_SCLKCON_DISPCLK, - .enable = s3c2443_clkcon_enable_s, - .ops = &(struct clk_ops) { - .get_rate = s3c2443_getrate_display, - .set_rate = s3c2443_setrate_display, - .round_rate = s3c2443_roundrate_clksrc256, +static struct clksrc_clk clk_display = { + .clk = { + .name = "display-if", + .id = -1, + .parent = &clk_esysclk, + .ctrlbit = S3C2443_SCLKCON_DISPCLK, + .enable = s3c2443_clkcon_enable_s, }, + .reg_div = { .reg = S3C2443_CLKDIV1, .size = 8, .shift = 16 }, }; /* prediv @@ -865,7 +618,7 @@ static struct clk init_clocks[] = { }, { .name = "usb-bus-host", .id = -1, - .parent = &clk_usb_bus_host, + .parent = &clk_usb_bus_host.clk, }, { .name = "ac97", .id = -1, @@ -887,50 +640,27 @@ static int __init clk_init_set_parent(struct clk *clk, struct clk *parent) return clk_set_parent(clk, parent); } +static struct clksrc_clk __initdata *init_list[] = { + &clk_epllref, /* should be first */ + &clk_i2s_eplldiv, + &clk_i2s, + &clk_cam, + &clk_uart, + &clk_display, + &clk_hsmmc_div, + &clk_usb_bus_host, +}; + static void __init s3c2443_clk_initparents(void) { unsigned long clksrc = __raw_readl(S3C2443_CLKSRC); struct clk *parent; - - switch (clksrc & S3C2443_CLKSRC_EPLLREF_MASK) { - case S3C2443_CLKSRC_EPLLREF_EXTCLK: - parent = &clk_ext; - break; - - case S3C2443_CLKSRC_EPLLREF_XTAL: - default: - parent = &clk_xtal; - break; - - case S3C2443_CLKSRC_EPLLREF_MPLLREF: - case S3C2443_CLKSRC_EPLLREF_MPLLREF2: - parent = &clk_mpllref; - break; - } - - clk_init_set_parent(&clk_epllref, parent); - - switch (clksrc & S3C2443_CLKSRC_I2S_MASK) { - case S3C2443_CLKSRC_I2S_EXT: - parent = &clk_i2s_ext; - break; - - case S3C2443_CLKSRC_I2S_EPLLDIV: - default: - parent = &clk_i2s_eplldiv; - break; - - case S3C2443_CLKSRC_I2S_EPLLREF: - case S3C2443_CLKSRC_I2S_EPLLREF3: - parent = &clk_epllref; - } - - clk_init_set_parent(&clk_i2s, &clk_epllref); + int ptr; /* esysclk source */ parent = (clksrc & S3C2443_CLKSRC_ESYSCLK_EPLL) ? - &clk_epll : &clk_epllref; + &clk_epll : &clk_epllref.clk; clk_init_set_parent(&clk_esysclk, parent); @@ -953,6 +683,9 @@ static void __init s3c2443_clk_initparents(void) parent = &clk_armdiv; clk_init_set_parent(&clk_arm, parent); + + for (ptr = 0; ptr < ARRAY_SIZE(init_list); ptr++) + s3c_set_clksrc(init_list[ptr], false); } /* armdiv divisor table */ @@ -984,15 +717,9 @@ static inline unsigned long s3c2443_get_hdiv(unsigned long clkcon0) /* clocks to add straight away */ -static struct clk *clks[] __initdata = { - &clk_ext, - &clk_epll, +static struct clksrc_clk *clksrcs[] __initdata = { &clk_usb_bus_host, - &clk_usb_bus, - &clk_esysclk, &clk_epllref, - &clk_mpllref, - &clk_msysclk, &clk_uart, &clk_display, &clk_cam, @@ -1000,6 +727,15 @@ static struct clk *clks[] __initdata = { &clk_i2s, &clk_hsspi, &clk_hsmmc_div, +}; + +static struct clk *clks[] __initdata = { + &clk_ext, + &clk_epll, + &clk_usb_bus, + &clk_esysclk, + &clk_mpllref, + &clk_msysclk, &clk_hsmmc, &clk_armdiv, &clk_arm, @@ -1064,15 +800,18 @@ void __init s3c2443_init_clocks(int xtal) } } + for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++) + s3c_register_clksrc(clksrcs[ptr], 1); + clk_epll.rate = s3c2443_get_epll(epllcon, xtal); - clk_epll.parent = &clk_epllref; - clk_usb_bus.parent = &clk_usb_bus_host; + clk_epll.parent = &clk_epllref.clk; + clk_usb_bus.parent = &clk_usb_bus_host.clk; /* ensure usb bus clock is within correct rate of 48MHz */ - if (clk_get_rate(&clk_usb_bus_host) != (48 * 1000 * 1000)) { + if (clk_get_rate(&clk_usb_bus_host.clk) != (48 * 1000 * 1000)) { printk(KERN_INFO "Warning: USB host bus not at 48MHz\n"); - clk_set_rate(&clk_usb_bus_host, 48*1000*1000); + clk_set_rate(&clk_usb_bus_host.clk, 48*1000*1000); } printk("S3C2443: epll %s %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n", |