2 * arch/ppc/kernel/ibm440gx_common.c
4 * PPC440GX system library
6 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
7 * Copyright (c) 2003, 2004 Zultys Technologies
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
15 #include <linux/config.h>
16 #include <linux/kernel.h>
17 #include <linux/interrupt.h>
18 #include <asm/ibm44x.h>
20 #include <asm/processor.h>
21 #include <syslib/ibm440gx_common.h>
24 * Calculate 440GX clocks
26 static inline u32 __fix_zero(u32 v, u32 def){
30 void __init ibm440gx_get_clocks(struct ibm44x_clocks* p, unsigned int sys_clk,
33 u32 pllc = CPR_READ(DCRN_CPR_PLLC);
34 u32 plld = CPR_READ(DCRN_CPR_PLLD);
35 u32 uart0 = SDR_READ(DCRN_SDR_UART0);
36 u32 uart1 = SDR_READ(DCRN_SDR_UART1);
38 u32 uart2 = SDR_READ(DCRN_SDR_UART2);
39 u32 uart3 = SDR_READ(DCRN_SDR_UART3);
43 u32 fbdv = __fix_zero((plld >> 24) & 0x1f, 32);
44 u32 fwdva = __fix_zero((plld >> 16) & 0xf, 16);
45 u32 fwdvb = __fix_zero((plld >> 8) & 7, 8);
46 u32 lfbdv = __fix_zero(plld & 0x3f, 64);
47 u32 pradv0 = __fix_zero((CPR_READ(DCRN_CPR_PRIMAD) >> 24) & 7, 8);
48 u32 prbdv0 = __fix_zero((CPR_READ(DCRN_CPR_PRIMBD) >> 24) & 7, 8);
49 u32 opbdv0 = __fix_zero((CPR_READ(DCRN_CPR_OPBD) >> 24) & 3, 4);
50 u32 perdv0 = __fix_zero((CPR_READ(DCRN_CPR_PERD) >> 24) & 3, 4);
52 /* Input clocks for primary dividers */
55 if (pllc & 0x40000000){
59 switch ((pllc >> 24) & 7){
62 m = ((pllc & 0x20000000) ? fwdvb : fwdva) * lfbdv;
70 m = fwdvb * prbdv0 * opbdv0 * perdv0;
73 printk(KERN_EMERG "invalid PLL feedback source\n");
78 clk_a = p->vco / fwdva;
79 clk_b = p->vco / fwdvb;
83 /* Bypass system PLL */
85 clk_a = clk_b = sys_clk;
88 p->cpu = clk_a / pradv0;
89 p->plb = clk_b / prbdv0;
90 p->opb = p->plb / opbdv0;
91 p->ebc = p->opb / perdv0;
94 if (uart0 & 0x00800000)
97 p->uart0 = p->plb / __fix_zero(uart0 & 0xff, 256);
99 if (uart1 & 0x00800000)
102 p->uart1 = p->plb / __fix_zero(uart1 & 0xff, 256);
104 if (uart2 & 0x00800000)
107 p->uart2 = p->plb / __fix_zero(uart2 & 0xff, 256);
109 if (uart3 & 0x00800000)
112 p->uart3 = p->plb / __fix_zero(uart3 & 0xff, 256);
116 /* Issue L2C diagnostic command */
117 static inline u32 l2c_diag(u32 addr)
119 mtdcr(DCRN_L2C0_ADDR, addr);
120 mtdcr(DCRN_L2C0_CMD, L2C_CMD_DIAG);
121 while (!(mfdcr(DCRN_L2C0_SR) & L2C_SR_CC)) ;
122 return mfdcr(DCRN_L2C0_DATA);
125 static irqreturn_t l2c_error_handler(int irq, void* dev, struct pt_regs* regs)
127 u32 sr = mfdcr(DCRN_L2C0_SR);
128 if (sr & L2C_SR_CPE){
129 /* Read cache trapped address */
130 u32 addr = l2c_diag(0x42000000);
131 printk(KERN_EMERG "L2C: Cache Parity Error, addr[16:26] = 0x%08x\n", addr);
133 if (sr & L2C_SR_TPE){
134 /* Read tag trapped address */
135 u32 addr = l2c_diag(0x82000000) >> 16;
136 printk(KERN_EMERG "L2C: Tag Parity Error, addr[16:26] = 0x%08x\n", addr);
139 /* Clear parity errors */
140 if (sr & (L2C_SR_CPE | L2C_SR_TPE)){
141 mtdcr(DCRN_L2C0_ADDR, 0);
142 mtdcr(DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
144 printk(KERN_EMERG "L2C: LRU error\n");
149 /* Enable L2 cache */
150 void __init ibm440gx_l2c_enable(void){
154 /* Install error handler */
155 if (request_irq(87, l2c_error_handler, SA_INTERRUPT, "L2C", 0) < 0){
156 printk(KERN_ERR "Cannot install L2C error handler, cache is not enabled\n");
160 local_irq_save(flags);
161 asm volatile ("sync" ::: "memory");
164 mtdcr(DCRN_SRAM0_DPC, mfdcr(DCRN_SRAM0_DPC) & ~SRAM_DPC_ENABLE);
165 mtdcr(DCRN_SRAM0_SB0CR, mfdcr(DCRN_SRAM0_SB0CR) & ~SRAM_SBCR_BU_MASK);
166 mtdcr(DCRN_SRAM0_SB1CR, mfdcr(DCRN_SRAM0_SB1CR) & ~SRAM_SBCR_BU_MASK);
167 mtdcr(DCRN_SRAM0_SB2CR, mfdcr(DCRN_SRAM0_SB2CR) & ~SRAM_SBCR_BU_MASK);
168 mtdcr(DCRN_SRAM0_SB3CR, mfdcr(DCRN_SRAM0_SB3CR) & ~SRAM_SBCR_BU_MASK);
170 /* Enable L2_MODE without ICU/DCU */
171 r = mfdcr(DCRN_L2C0_CFG) & ~(L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_SS_MASK);
172 r |= L2C_CFG_L2M | L2C_CFG_SS_256;
173 mtdcr(DCRN_L2C0_CFG, r);
175 mtdcr(DCRN_L2C0_ADDR, 0);
177 /* Hardware Clear Command */
178 mtdcr(DCRN_L2C0_CMD, L2C_CMD_HCC);
179 while (!(mfdcr(DCRN_L2C0_SR) & L2C_SR_CC)) ;
181 /* Clear Cache Parity and Tag Errors */
182 mtdcr(DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
184 /* Enable 64G snoop region starting at 0 */
185 r = mfdcr(DCRN_L2C0_SNP0) & ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
186 r |= L2C_SNP_SSR_32G | L2C_SNP_ESR;
187 mtdcr(DCRN_L2C0_SNP0, r);
189 r = mfdcr(DCRN_L2C0_SNP1) & ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
190 r |= 0x80000000 | L2C_SNP_SSR_32G | L2C_SNP_ESR;
191 mtdcr(DCRN_L2C0_SNP1, r);
193 asm volatile ("sync" ::: "memory");
195 /* Enable ICU/DCU ports */
196 r = mfdcr(DCRN_L2C0_CFG);
197 r &= ~(L2C_CFG_DCW_MASK | L2C_CFG_PMUX_MASK | L2C_CFG_PMIM | L2C_CFG_TPEI
198 | L2C_CFG_CPEI | L2C_CFG_NAM | L2C_CFG_NBRM);
199 r |= L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_TPC | L2C_CFG_CPC | L2C_CFG_FRAN
200 | L2C_CFG_CPIM | L2C_CFG_TPIM | L2C_CFG_LIM | L2C_CFG_SMCM;
201 mtdcr(DCRN_L2C0_CFG, r);
203 asm volatile ("sync; isync" ::: "memory");
204 local_irq_restore(flags);
207 /* Disable L2 cache */
208 void __init ibm440gx_l2c_disable(void){
212 local_irq_save(flags);
213 asm volatile ("sync" ::: "memory");
215 /* Disable L2C mode */
216 r = mfdcr(DCRN_L2C0_CFG) & ~(L2C_CFG_L2M | L2C_CFG_ICU | L2C_CFG_DCU);
217 mtdcr(DCRN_L2C0_CFG, r);
220 mtdcr(DCRN_SRAM0_DPC, mfdcr(DCRN_SRAM0_DPC) | SRAM_DPC_ENABLE);
221 mtdcr(DCRN_SRAM0_SB0CR,
222 SRAM_SBCR_BAS0 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
223 mtdcr(DCRN_SRAM0_SB1CR,
224 SRAM_SBCR_BAS1 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
225 mtdcr(DCRN_SRAM0_SB2CR,
226 SRAM_SBCR_BAS2 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
227 mtdcr(DCRN_SRAM0_SB3CR,
228 SRAM_SBCR_BAS3 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
230 asm volatile ("sync; isync" ::: "memory");
231 local_irq_restore(flags);
234 void __init ibm440gx_l2c_setup(struct ibm44x_clocks* p)
236 /* Disable L2C on rev.A, rev.B and 800MHz version of rev.C,
237 enable it on all other revisions
239 if (strcmp(cur_cpu_spec->cpu_name, "440GX Rev. A") == 0 ||
240 strcmp(cur_cpu_spec->cpu_name, "440GX Rev. B") == 0
241 || (strcmp(cur_cpu_spec->cpu_name, "440GX Rev. C")
242 == 0 && p->cpu > 667000000))
243 ibm440gx_l2c_disable();
245 ibm440gx_l2c_enable();
248 int __init ibm440gx_get_eth_grp(void)
250 return (SDR_READ(DCRN_SDR_PFC1) & DCRN_SDR_PFC1_EPS) >> DCRN_SDR_PFC1_EPS_SHIFT;
253 void __init ibm440gx_set_eth_grp(int group)
255 SDR_WRITE(DCRN_SDR_PFC1, (SDR_READ(DCRN_SDR_PFC1) & ~DCRN_SDR_PFC1_EPS) | (group << DCRN_SDR_PFC1_EPS_SHIFT));
258 void __init ibm440gx_tah_enable(void)
260 /* Enable TAH0 and TAH1 */
261 SDR_WRITE(DCRN_SDR_MFR,SDR_READ(DCRN_SDR_MFR) &
263 SDR_WRITE(DCRN_SDR_MFR,SDR_READ(DCRN_SDR_MFR) &
267 int ibm440gx_show_cpuinfo(struct seq_file *m){
269 u32 l2c_cfg = mfdcr(DCRN_L2C0_CFG);
271 if (l2c_cfg & L2C_CFG_L2M){
272 switch (l2c_cfg & (L2C_CFG_ICU | L2C_CFG_DCU)){
273 case L2C_CFG_ICU: s = "I-Cache only"; break;
274 case L2C_CFG_DCU: s = "D-Cache only"; break;
275 default: s = "I-Cache/D-Cache"; break;
281 seq_printf(m, "L2-Cache\t: %s (0x%08x 0x%08x)\n", s,
282 l2c_cfg, mfdcr(DCRN_L2C0_SR));