17 #include <linux/clk-provider.h>
23 #include "clk-iproc.h"
25 #define IPROC_CLK_MAX_FREQ_POLICY                    0x3
26 #define IPROC_CLK_POLICY_FREQ_OFFSET                 0x008
28 #define IPROC_CLK_POLICY_FREQ_POLICY_FREQ_MASK       0x7
30 #define IPROC_CLK_PLLARMA_OFFSET                     0xc00
33 #define IPROC_CLK_PLLARMA_PDIV_MASK                  0xf
35 #define IPROC_CLK_PLLARMA_NDIV_INT_MASK              0x3ff
37 #define IPROC_CLK_PLLARMB_OFFSET                     0xc04
38 #define IPROC_CLK_PLLARMB_NDIV_FRAC_MASK             0xfffff
40 #define IPROC_CLK_PLLARMC_OFFSET                     0xc08
42 #define IPROC_CLK_PLLARMC_MDIV_MASK                  0xff
44 #define IPROC_CLK_PLLARMCTL5_OFFSET                  0xc20
45 #define IPROC_CLK_PLLARMCTL5_H_MDIV_MASK             0xff
47 #define IPROC_CLK_PLLARM_OFFSET_OFFSET               0xc24
50 #define IPROC_CLK_PLLARM_NDIV_INT_OFFSET_MASK        0xff
51 #define IPROC_CLK_PLLARM_NDIV_FRAC_OFFSET_MASK       0xfffff
53 #define IPROC_CLK_ARM_DIV_OFFSET                     0xe00
55 #define IPROC_CLK_ARM_DIV_ARM_PLL_SELECT_MASK        0xf
57 #define IPROC_CLK_POLICY_DBG_OFFSET                  0xec0
59 #define IPROC_CLK_POLICY_DBG_ACT_FREQ_MASK           0x7
62 	ARM_PLL_FID_CRYSTAL_CLK   = 0,
76 static unsigned int __get_fid(struct iproc_arm_pll *pll)  in __get_fid()  argument
81 	val = readl(pll->base + IPROC_CLK_ARM_DIV_OFFSET);  in __get_fid()
85 		policy = 0;  in __get_fid()
90 	val = readl(pll->base + IPROC_CLK_POLICY_FREQ_OFFSET);  in __get_fid()
94 	val = readl(pll->base + IPROC_CLK_POLICY_DBG_OFFSET);  in __get_fid()
98 		pr_debug("%s: fid override %u->%u\n", __func__,	fid,  in __get_fid()
111  *    - 25 MHz Crystal
112  *    - System clock
113  *    - PLL channel 0 (slow clock)
114  *    - PLL channel 1 (fast clock)
116 static int __get_mdiv(struct iproc_arm_pll *pll)  in __get_mdiv()  argument
122 	fid = __get_fid(pll);  in __get_mdiv()
131 		val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);  in __get_mdiv()
133 		if (mdiv == 0)  in __get_mdiv()
138 		val = readl(pll->base +	IPROC_CLK_PLLARMCTL5_OFFSET);  in __get_mdiv()
140 		if (mdiv == 0)  in __get_mdiv()
145 		mdiv = -EFAULT;  in __get_mdiv()
151 static unsigned int __get_ndiv(struct iproc_arm_pll *pll)  in __get_ndiv()  argument
156 	val = readl(pll->base + IPROC_CLK_PLLARM_OFFSET_OFFSET);  in __get_ndiv()
164 		if (ndiv_int == 0)  in __get_ndiv()
170 		val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);  in __get_ndiv()
173 		if (ndiv_int == 0)  in __get_ndiv()
176 		val = readl(pll->base + IPROC_CLK_PLLARMB_OFFSET);  in __get_ndiv()
186  * The output frequency of the ARM PLL is calculated based on the ARM PLL
188  *   pdiv = ARM PLL pre-divider
189  *   ndiv = ARM PLL multiplier
190  *   mdiv = ARM PLL post divider
198 	struct iproc_arm_pll *pll = to_iproc_arm_pll(hw);  in iproc_arm_pll_recalc_rate()  local
205 	val = readl(pll->base + IPROC_CLK_PLLARMC_OFFSET);  in iproc_arm_pll_recalc_rate()
207 		pll->rate = parent_rate;  in iproc_arm_pll_recalc_rate()
208 		return pll->rate;  in iproc_arm_pll_recalc_rate()
211 	/* PLL needs to be locked */  in iproc_arm_pll_recalc_rate()
212 	val = readl(pll->base + IPROC_CLK_PLLARMA_OFFSET);  in iproc_arm_pll_recalc_rate()
214 		pll->rate = 0;  in iproc_arm_pll_recalc_rate()
215 		return 0;  in iproc_arm_pll_recalc_rate()
220 	if (pdiv == 0)  in iproc_arm_pll_recalc_rate()
223 	ndiv = __get_ndiv(pll);  in iproc_arm_pll_recalc_rate()
224 	mdiv = __get_mdiv(pll);  in iproc_arm_pll_recalc_rate()
225 	if (mdiv <= 0) {  in iproc_arm_pll_recalc_rate()
226 		pll->rate = 0;  in iproc_arm_pll_recalc_rate()
227 		return 0;  in iproc_arm_pll_recalc_rate()
229 	pll->rate = (ndiv * parent_rate) >> 20;  in iproc_arm_pll_recalc_rate()
230 	pll->rate = (pll->rate / pdiv) / mdiv;  in iproc_arm_pll_recalc_rate()
232 	pr_debug("%s: ARM PLL rate: %lu. parent rate: %lu\n", __func__,  in iproc_arm_pll_recalc_rate()
233 		 pll->rate, parent_rate);  in iproc_arm_pll_recalc_rate()
237 	return pll->rate;  in iproc_arm_pll_recalc_rate()
247 	struct iproc_arm_pll *pll;  in iproc_armpll_setup()  local
251 	pll = kzalloc(sizeof(*pll), GFP_KERNEL);  in iproc_armpll_setup()
252 	if (WARN_ON(!pll))  in iproc_armpll_setup()
255 	pll->base = of_iomap(node, 0);  in iproc_armpll_setup()
256 	if (WARN_ON(!pll->base))  in iproc_armpll_setup()
259 	init.name = node->name;  in iproc_armpll_setup()
261 	init.flags = 0;  in iproc_armpll_setup()
262 	parent_name = of_clk_get_parent_name(node, 0);  in iproc_armpll_setup()
264 	init.num_parents = (parent_name ? 1 : 0);  in iproc_armpll_setup()
265 	pll->hw.init = &init;  in iproc_armpll_setup()
267 	ret = clk_hw_register(NULL, &pll->hw);  in iproc_armpll_setup()
271 	ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get, &pll->hw);  in iproc_armpll_setup()
278 	clk_hw_unregister(&pll->hw);  in iproc_armpll_setup()
280 	iounmap(pll->base);  in iproc_armpll_setup()
282 	kfree(pll);  in iproc_armpll_setup()